1 // gogo.cc -- Go frontend parsed representation.
3 // Copyright 2009 The Go Authors. All rights reserved.
4 // Use of this source code is governed by a BSD-style
5 // license that can be found in the LICENSE file.
11 #include "filenames.h"
14 #include "go-diagnostics.h"
15 #include "go-encode-id.h"
17 #include "go-optimize.h"
20 #include "statements.h"
21 #include "expressions.h"
30 Gogo::Gogo(Backend
* backend
, Linemap
* linemap
, int, int pointer_size
)
35 globals_(new Bindings(NULL
)),
38 imported_unsafe_(false),
39 current_file_imported_unsafe_(false),
50 pkgpath_from_option_(false),
51 prefix_from_option_(false),
52 relative_import_path_(),
54 check_divide_by_zero_(true),
55 check_divide_overflow_(true),
56 compiling_runtime_(false),
57 debug_escape_level_(0),
58 nil_check_size_threshold_(4096),
61 specific_type_functions_(),
62 specific_type_functions_are_written_(false),
63 named_types_are_converted_(false),
67 const Location loc
= Linemap::predeclared_location();
69 Named_type
* uint8_type
= Type::make_integer_type("uint8", true, 8,
70 RUNTIME_TYPE_KIND_UINT8
);
71 this->add_named_type(uint8_type
);
72 this->add_named_type(Type::make_integer_type("uint16", true, 16,
73 RUNTIME_TYPE_KIND_UINT16
));
74 this->add_named_type(Type::make_integer_type("uint32", true, 32,
75 RUNTIME_TYPE_KIND_UINT32
));
76 this->add_named_type(Type::make_integer_type("uint64", true, 64,
77 RUNTIME_TYPE_KIND_UINT64
));
79 this->add_named_type(Type::make_integer_type("int8", false, 8,
80 RUNTIME_TYPE_KIND_INT8
));
81 this->add_named_type(Type::make_integer_type("int16", false, 16,
82 RUNTIME_TYPE_KIND_INT16
));
83 Named_type
* int32_type
= Type::make_integer_type("int32", false, 32,
84 RUNTIME_TYPE_KIND_INT32
);
85 this->add_named_type(int32_type
);
86 this->add_named_type(Type::make_integer_type("int64", false, 64,
87 RUNTIME_TYPE_KIND_INT64
));
89 this->add_named_type(Type::make_float_type("float32", 32,
90 RUNTIME_TYPE_KIND_FLOAT32
));
91 this->add_named_type(Type::make_float_type("float64", 64,
92 RUNTIME_TYPE_KIND_FLOAT64
));
94 this->add_named_type(Type::make_complex_type("complex64", 64,
95 RUNTIME_TYPE_KIND_COMPLEX64
));
96 this->add_named_type(Type::make_complex_type("complex128", 128,
97 RUNTIME_TYPE_KIND_COMPLEX128
));
99 int int_type_size
= pointer_size
;
100 if (int_type_size
< 32)
102 this->add_named_type(Type::make_integer_type("uint", true,
104 RUNTIME_TYPE_KIND_UINT
));
105 Named_type
* int_type
= Type::make_integer_type("int", false, int_type_size
,
106 RUNTIME_TYPE_KIND_INT
);
107 this->add_named_type(int_type
);
109 this->add_named_type(Type::make_integer_type("uintptr", true,
111 RUNTIME_TYPE_KIND_UINTPTR
));
113 // "byte" is an alias for "uint8".
114 uint8_type
->integer_type()->set_is_byte();
115 Named_object
* byte_type
= Named_object::make_type("byte", NULL
, uint8_type
,
117 byte_type
->type_value()->set_is_alias();
118 this->add_named_type(byte_type
->type_value());
120 // "rune" is an alias for "int32".
121 int32_type
->integer_type()->set_is_rune();
122 Named_object
* rune_type
= Named_object::make_type("rune", NULL
, int32_type
,
124 rune_type
->type_value()->set_is_alias();
125 this->add_named_type(rune_type
->type_value());
127 this->add_named_type(Type::make_named_bool_type());
129 this->add_named_type(Type::make_named_string_type());
131 // "error" is interface { Error() string }.
133 Typed_identifier_list
*methods
= new Typed_identifier_list
;
134 Typed_identifier_list
*results
= new Typed_identifier_list
;
135 results
->push_back(Typed_identifier("", Type::lookup_string_type(), loc
));
136 Type
*method_type
= Type::make_function_type(NULL
, NULL
, results
, loc
);
137 methods
->push_back(Typed_identifier("Error", method_type
, loc
));
138 Interface_type
*error_iface
= Type::make_interface_type(methods
, loc
);
139 error_iface
->finalize_methods();
140 Named_type
*error_type
= Named_object::make_type("error", NULL
, error_iface
, loc
)->type_value();
141 this->add_named_type(error_type
);
144 this->globals_
->add_constant(Typed_identifier("true",
145 Type::make_boolean_type(),
148 Expression::make_boolean(true, loc
),
150 this->globals_
->add_constant(Typed_identifier("false",
151 Type::make_boolean_type(),
154 Expression::make_boolean(false, loc
),
157 this->globals_
->add_constant(Typed_identifier("nil", Type::make_nil_type(),
160 Expression::make_nil(loc
),
163 Type
* abstract_int_type
= Type::make_abstract_integer_type();
164 this->globals_
->add_constant(Typed_identifier("iota", abstract_int_type
,
167 Expression::make_iota(),
170 Function_type
* new_type
= Type::make_function_type(NULL
, NULL
, NULL
, loc
);
171 new_type
->set_is_varargs();
172 new_type
->set_is_builtin();
173 this->globals_
->add_function_declaration("new", NULL
, new_type
, loc
);
175 Function_type
* make_type
= Type::make_function_type(NULL
, NULL
, NULL
, loc
);
176 make_type
->set_is_varargs();
177 make_type
->set_is_builtin();
178 this->globals_
->add_function_declaration("make", NULL
, make_type
, loc
);
180 Typed_identifier_list
* len_result
= new Typed_identifier_list();
181 len_result
->push_back(Typed_identifier("", int_type
, loc
));
182 Function_type
* len_type
= Type::make_function_type(NULL
, NULL
, len_result
,
184 len_type
->set_is_builtin();
185 this->globals_
->add_function_declaration("len", NULL
, len_type
, loc
);
187 Typed_identifier_list
* cap_result
= new Typed_identifier_list();
188 cap_result
->push_back(Typed_identifier("", int_type
, loc
));
189 Function_type
* cap_type
= Type::make_function_type(NULL
, NULL
, len_result
,
191 cap_type
->set_is_builtin();
192 this->globals_
->add_function_declaration("cap", NULL
, cap_type
, loc
);
194 Function_type
* print_type
= Type::make_function_type(NULL
, NULL
, NULL
, loc
);
195 print_type
->set_is_varargs();
196 print_type
->set_is_builtin();
197 this->globals_
->add_function_declaration("print", NULL
, print_type
, loc
);
199 print_type
= Type::make_function_type(NULL
, NULL
, NULL
, loc
);
200 print_type
->set_is_varargs();
201 print_type
->set_is_builtin();
202 this->globals_
->add_function_declaration("println", NULL
, print_type
, loc
);
204 Type
*empty
= Type::make_empty_interface_type(loc
);
205 Typed_identifier_list
* panic_parms
= new Typed_identifier_list();
206 panic_parms
->push_back(Typed_identifier("e", empty
, loc
));
207 Function_type
*panic_type
= Type::make_function_type(NULL
, panic_parms
,
209 panic_type
->set_is_builtin();
210 this->globals_
->add_function_declaration("panic", NULL
, panic_type
, loc
);
212 Typed_identifier_list
* recover_result
= new Typed_identifier_list();
213 recover_result
->push_back(Typed_identifier("", empty
, loc
));
214 Function_type
* recover_type
= Type::make_function_type(NULL
, NULL
,
217 recover_type
->set_is_builtin();
218 this->globals_
->add_function_declaration("recover", NULL
, recover_type
, loc
);
220 Function_type
* close_type
= Type::make_function_type(NULL
, NULL
, NULL
, loc
);
221 close_type
->set_is_varargs();
222 close_type
->set_is_builtin();
223 this->globals_
->add_function_declaration("close", NULL
, close_type
, loc
);
225 Typed_identifier_list
* copy_result
= new Typed_identifier_list();
226 copy_result
->push_back(Typed_identifier("", int_type
, loc
));
227 Function_type
* copy_type
= Type::make_function_type(NULL
, NULL
,
229 copy_type
->set_is_varargs();
230 copy_type
->set_is_builtin();
231 this->globals_
->add_function_declaration("copy", NULL
, copy_type
, loc
);
233 Function_type
* append_type
= Type::make_function_type(NULL
, NULL
, NULL
, loc
);
234 append_type
->set_is_varargs();
235 append_type
->set_is_builtin();
236 this->globals_
->add_function_declaration("append", NULL
, append_type
, loc
);
238 Function_type
* complex_type
= Type::make_function_type(NULL
, NULL
, NULL
, loc
);
239 complex_type
->set_is_varargs();
240 complex_type
->set_is_builtin();
241 this->globals_
->add_function_declaration("complex", NULL
, complex_type
, loc
);
243 Function_type
* real_type
= Type::make_function_type(NULL
, NULL
, NULL
, loc
);
244 real_type
->set_is_varargs();
245 real_type
->set_is_builtin();
246 this->globals_
->add_function_declaration("real", NULL
, real_type
, loc
);
248 Function_type
* imag_type
= Type::make_function_type(NULL
, NULL
, NULL
, loc
);
249 imag_type
->set_is_varargs();
250 imag_type
->set_is_builtin();
251 this->globals_
->add_function_declaration("imag", NULL
, imag_type
, loc
);
253 Function_type
* delete_type
= Type::make_function_type(NULL
, NULL
, NULL
, loc
);
254 delete_type
->set_is_varargs();
255 delete_type
->set_is_builtin();
256 this->globals_
->add_function_declaration("delete", NULL
, delete_type
, loc
);
259 // Convert a pkgpath into a string suitable for a symbol. Note that
260 // this transformation is convenient but imperfect. A -fgo-pkgpath
261 // option of a/b_c will conflict with a -fgo-pkgpath option of a_b/c,
262 // possibly leading to link time errors.
265 Gogo::pkgpath_for_symbol(const std::string
& pkgpath
)
267 std::string s
= pkgpath
;
268 for (size_t i
= 0; i
< s
.length(); ++i
)
271 if ((c
>= 'a' && c
<= 'z')
272 || (c
>= 'A' && c
<= 'Z')
273 || (c
>= '0' && c
<= '9'))
281 // Get the package path to use for type reflection data. This should
282 // ideally be unique across the entire link.
285 Gogo::pkgpath() const
287 go_assert(this->pkgpath_set_
);
288 return this->pkgpath_
;
291 // Set the package path from the -fgo-pkgpath command line option.
294 Gogo::set_pkgpath(const std::string
& arg
)
296 go_assert(!this->pkgpath_set_
);
297 this->pkgpath_
= arg
;
298 this->pkgpath_set_
= true;
299 this->pkgpath_from_option_
= true;
302 // Get the package path to use for symbol names.
305 Gogo::pkgpath_symbol() const
307 go_assert(this->pkgpath_set_
);
308 return this->pkgpath_symbol_
;
311 // Set the unique prefix to use to determine the package path, from
312 // the -fgo-prefix command line option.
315 Gogo::set_prefix(const std::string
& arg
)
317 go_assert(!this->prefix_from_option_
);
319 this->prefix_from_option_
= true;
322 // Munge name for use in an error message.
325 Gogo::message_name(const std::string
& name
)
327 return go_localize_identifier(Gogo::unpack_hidden_name(name
).c_str());
330 // Get the package name.
333 Gogo::package_name() const
335 go_assert(this->package_
!= NULL
);
336 return this->package_
->package_name();
339 // Set the package name.
342 Gogo::set_package_name(const std::string
& package_name
,
345 if (this->package_
!= NULL
)
347 if (this->package_
->package_name() != package_name
)
348 go_error_at(location
, "expected package %<%s%>",
349 Gogo::message_name(this->package_
->package_name()).c_str());
353 // Now that we know the name of the package we are compiling, set
354 // the package path to use for reflect.Type.PkgPath and global
356 if (this->pkgpath_set_
)
357 this->pkgpath_symbol_
= Gogo::pkgpath_for_symbol(this->pkgpath_
);
360 if (!this->prefix_from_option_
&& package_name
== "main")
362 this->pkgpath_
= package_name
;
363 this->pkgpath_symbol_
= Gogo::pkgpath_for_symbol(package_name
);
367 if (!this->prefix_from_option_
)
368 this->prefix_
= "go";
369 this->pkgpath_
= this->prefix_
+ '.' + package_name
;
370 this->pkgpath_symbol_
= (Gogo::pkgpath_for_symbol(this->prefix_
) + '.'
371 + Gogo::pkgpath_for_symbol(package_name
));
373 this->pkgpath_set_
= true;
376 this->package_
= this->register_package(this->pkgpath_
,
377 this->pkgpath_symbol_
, location
);
378 this->package_
->set_package_name(package_name
, location
);
380 if (this->is_main_package())
382 // Declare "main" as a function which takes no parameters and
384 Location uloc
= Linemap::unknown_location();
385 this->declare_function(Gogo::pack_hidden_name("main", false),
386 Type::make_function_type (NULL
, NULL
, NULL
, uloc
),
391 // Return whether this is the "main" package. This is not true if
392 // -fgo-pkgpath or -fgo-prefix was used.
395 Gogo::is_main_package() const
397 return (this->package_name() == "main"
398 && !this->pkgpath_from_option_
399 && !this->prefix_from_option_
);
405 Gogo::import_package(const std::string
& filename
,
406 const std::string
& local_name
,
407 bool is_local_name_exported
,
411 if (filename
.empty())
413 go_error_at(location
, "import path is empty");
417 const char *pf
= filename
.data();
418 const char *pend
= pf
+ filename
.length();
422 int adv
= Lex::fetch_char(pf
, &c
);
425 go_error_at(location
, "import path contains invalid UTF-8 sequence");
430 go_error_at(location
, "import path contains NUL");
433 if (c
< 0x20 || c
== 0x7f)
435 go_error_at(location
, "import path contains control character");
440 go_error_at(location
, "import path contains backslash; use slash");
443 if (Lex::is_unicode_space(c
))
445 go_error_at(location
, "import path contains space character");
448 if (c
< 0x7f && strchr("!\"#$%&'()*,:;<=>?[]^`{|}", c
) != NULL
)
450 go_error_at(location
,
451 "import path contains invalid character '%c'", c
);
457 if (IS_ABSOLUTE_PATH(filename
.c_str()))
459 go_error_at(location
, "import path cannot be absolute path");
463 if (local_name
== "init")
464 go_error_at(location
, "cannot import package as init");
466 if (filename
== "unsafe")
468 this->import_unsafe(local_name
, is_local_name_exported
, location
);
469 this->current_file_imported_unsafe_
= true;
473 Imports::const_iterator p
= this->imports_
.find(filename
);
474 if (p
!= this->imports_
.end())
476 Package
* package
= p
->second
;
477 package
->set_location(location
);
478 std::string ln
= local_name
;
479 bool is_ln_exported
= is_local_name_exported
;
482 ln
= package
->package_name();
483 go_assert(!ln
.empty());
484 is_ln_exported
= Lex::is_exported_name(ln
);
490 Bindings
* bindings
= package
->bindings();
491 for (Bindings::const_declarations_iterator p
=
492 bindings
->begin_declarations();
493 p
!= bindings
->end_declarations();
495 this->add_dot_import_object(p
->second
);
496 std::string dot_alias
= "." + package
->package_name();
497 package
->add_alias(dot_alias
, location
);
501 package
->add_alias(ln
, location
);
502 ln
= this->pack_hidden_name(ln
, is_ln_exported
);
503 this->package_
->bindings()->add_package(ln
, package
);
508 Import::Stream
* stream
= Import::open_package(filename
, location
,
509 this->relative_import_path_
);
513 go_error_at(location
, "import file %qs not found", filename
.c_str());
517 Import
imp(stream
, location
);
518 imp
.register_builtin_types(this);
519 Package
* package
= imp
.import(this, local_name
, is_local_name_exported
);
522 if (package
->pkgpath() == this->pkgpath())
523 go_error_at(location
,
524 ("imported package uses same package path as package "
525 "being compiled (see -fgo-pkgpath option)"));
527 this->imports_
.insert(std::make_pair(filename
, package
));
534 Gogo::lookup_init(const std::string
& init_name
)
536 Import_init
tmp("", init_name
, -1);
537 Import_init_set::iterator it
= this->imported_init_fns_
.find(&tmp
);
538 return (it
!= this->imported_init_fns_
.end()) ? *it
: NULL
;
541 // Add an import control function for an imported package to the list.
544 Gogo::add_import_init_fn(const std::string
& package_name
,
545 const std::string
& init_name
, int prio
)
547 for (Import_init_set::iterator p
=
548 this->imported_init_fns_
.begin();
549 p
!= this->imported_init_fns_
.end();
552 Import_init
*ii
= (*p
);
553 if (ii
->init_name() == init_name
)
555 // If a test of package P1, built as part of package P1,
556 // imports package P2, and P2 imports P1 (perhaps
557 // indirectly), then we will see the same import name with
558 // different import priorities. That is OK, so don't give
559 // an error about it.
560 if (ii
->package_name() != package_name
)
562 go_error_at(Linemap::unknown_location(),
563 "duplicate package initialization name %qs",
564 Gogo::message_name(init_name
).c_str());
565 go_inform(Linemap::unknown_location(), "used by package %qs",
566 Gogo::message_name(ii
->package_name()).c_str());
567 go_inform(Linemap::unknown_location(), " and by package %qs",
568 Gogo::message_name(package_name
).c_str());
570 ii
->set_priority(prio
);
575 Import_init
* nii
= new Import_init(package_name
, init_name
, prio
);
576 this->imported_init_fns_
.insert(nii
);
579 // Return whether we are at the global binding level.
582 Gogo::in_global_scope() const
584 return this->functions_
.empty();
587 // Return the current binding contour.
590 Gogo::current_bindings()
592 if (!this->functions_
.empty())
593 return this->functions_
.back().blocks
.back()->bindings();
594 else if (this->package_
!= NULL
)
595 return this->package_
->bindings();
597 return this->globals_
;
601 Gogo::current_bindings() const
603 if (!this->functions_
.empty())
604 return this->functions_
.back().blocks
.back()->bindings();
605 else if (this->package_
!= NULL
)
606 return this->package_
->bindings();
608 return this->globals_
;
612 Gogo::update_init_priority(Import_init
* ii
,
613 std::set
<const Import_init
*>* visited
)
618 for (std::set
<std::string
>::const_iterator pci
=
619 ii
->precursors().begin();
620 pci
!= ii
->precursors().end();
623 Import_init
* succ
= this->lookup_init(*pci
);
624 if (visited
->find(succ
) == visited
->end())
625 update_init_priority(succ
, visited
);
626 succ_prior
= std::max(succ_prior
, succ
->priority());
628 if (ii
->priority() <= succ_prior
)
629 ii
->set_priority(succ_prior
+ 1);
633 Gogo::recompute_init_priorities()
635 std::set
<Import_init
*> nonroots
;
637 for (Import_init_set::const_iterator p
=
638 this->imported_init_fns_
.begin();
639 p
!= this->imported_init_fns_
.end();
642 const Import_init
*ii
= *p
;
643 for (std::set
<std::string
>::const_iterator pci
=
644 ii
->precursors().begin();
645 pci
!= ii
->precursors().end();
648 Import_init
* ii
= this->lookup_init(*pci
);
653 // Recursively update priorities starting at roots.
654 std::set
<const Import_init
*> visited
;
655 for (Import_init_set::iterator p
=
656 this->imported_init_fns_
.begin();
657 p
!= this->imported_init_fns_
.end();
660 Import_init
* ii
= *p
;
661 if (nonroots
.find(ii
) != nonroots
.end())
663 update_init_priority(ii
, &visited
);
667 // Add statements to INIT_STMTS which run the initialization
668 // functions for imported packages. This is only used for the "main"
672 Gogo::init_imports(std::vector
<Bstatement
*>& init_stmts
, Bfunction
*bfunction
)
674 go_assert(this->is_main_package());
676 if (this->imported_init_fns_
.empty())
679 Location unknown_loc
= Linemap::unknown_location();
680 Function_type
* func_type
=
681 Type::make_function_type(NULL
, NULL
, NULL
, unknown_loc
);
682 Btype
* fntype
= func_type
->get_backend_fntype(this);
684 // Recompute init priorities based on a walk of the init graph.
685 recompute_init_priorities();
687 // We must call them in increasing priority order.
688 std::vector
<const Import_init
*> v
;
689 for (Import_init_set::const_iterator p
=
690 this->imported_init_fns_
.begin();
691 p
!= this->imported_init_fns_
.end();
694 if ((*p
)->priority() < 0)
695 go_error_at(Linemap::unknown_location(),
696 "internal error: failed to set init priority for %s",
697 (*p
)->package_name().c_str());
700 std::sort(v
.begin(), v
.end(), priority_compare
);
702 // We build calls to the init functions, which take no arguments.
703 std::vector
<Bexpression
*> empty_args
;
704 for (std::vector
<const Import_init
*>::const_iterator p
= v
.begin();
708 const Import_init
* ii
= *p
;
709 std::string user_name
= ii
->package_name() + ".init";
710 const std::string
& init_name(ii
->init_name());
712 Bfunction
* pfunc
= this->backend()->function(fntype
, user_name
, init_name
,
713 true, true, true, false,
714 false, false, unknown_loc
);
715 Bexpression
* pfunc_code
=
716 this->backend()->function_code_expression(pfunc
, unknown_loc
);
717 Bexpression
* pfunc_call
=
718 this->backend()->call_expression(bfunction
, pfunc_code
, empty_args
,
720 init_stmts
.push_back(this->backend()->expression_statement(bfunction
,
725 // Register global variables with the garbage collector. We need to
726 // register all variables which can hold a pointer value. They become
727 // roots during the mark phase. We build a struct that is easy to
728 // hook into a list of roots.
730 // type gcRoot struct {
731 // decl unsafe.Pointer // Pointer to variable.
732 // size uintptr // Total size of variable.
733 // ptrdata uintptr // Length of variable's gcdata.
734 // gcdata *byte // Pointer mask.
737 // type gcRootList struct {
743 // The last entry in the roots array has a NULL decl field.
746 Gogo::register_gc_vars(const std::vector
<Named_object
*>& var_gc
,
747 std::vector
<Bstatement
*>& init_stmts
,
750 if (var_gc
.empty() && this->gc_roots_
.empty())
753 Type
* pvt
= Type::make_pointer_type(Type::make_void_type());
754 Type
* uintptr_type
= Type::lookup_integer_type("uintptr");
755 Type
* byte_type
= this->lookup_global("byte")->type_value();
756 Type
* pointer_byte_type
= Type::make_pointer_type(byte_type
);
757 Struct_type
* root_type
=
758 Type::make_builtin_struct_type(4,
760 "size", uintptr_type
,
761 "ptrdata", uintptr_type
,
762 "gcdata", pointer_byte_type
);
764 Location builtin_loc
= Linemap::predeclared_location();
765 unsigned long roots_len
= var_gc
.size() + this->gc_roots_
.size();
766 Expression
* length
= Expression::make_integer_ul(roots_len
, NULL
,
768 Array_type
* root_array_type
= Type::make_array_type(root_type
, length
);
769 root_array_type
->set_is_array_incomparable();
771 Type
* int_type
= Type::lookup_integer_type("int");
772 Struct_type
* root_list_type
=
773 Type::make_builtin_struct_type(3,
776 "roots", root_array_type
);
778 // Build an initializer for the roots array.
780 Expression_list
* roots_init
= new Expression_list();
782 for (std::vector
<Named_object
*>::const_iterator p
= var_gc
.begin();
786 Expression_list
* init
= new Expression_list();
788 Location no_loc
= (*p
)->location();
789 Expression
* decl
= Expression::make_var_reference(*p
, no_loc
);
790 Expression
* decl_addr
=
791 Expression::make_unary(OPERATOR_AND
, decl
, no_loc
);
792 decl_addr
->unary_expression()->set_does_not_escape();
793 decl_addr
= Expression::make_cast(pvt
, decl_addr
, no_loc
);
794 init
->push_back(decl_addr
);
797 Expression::make_type_info(decl
->type(),
798 Expression::TYPE_INFO_SIZE
);
799 init
->push_back(size
);
801 Expression
* ptrdata
=
802 Expression::make_type_info(decl
->type(),
803 Expression::TYPE_INFO_BACKEND_PTRDATA
);
804 init
->push_back(ptrdata
);
806 Expression
* gcdata
= Expression::make_ptrmask_symbol(decl
->type());
807 init
->push_back(gcdata
);
809 Expression
* root_ctor
=
810 Expression::make_struct_composite_literal(root_type
, init
, no_loc
);
811 roots_init
->push_back(root_ctor
);
814 for (std::vector
<Expression
*>::const_iterator p
= this->gc_roots_
.begin();
815 p
!= this->gc_roots_
.end();
818 Expression_list
*init
= new Expression_list();
820 Expression
* expr
= *p
;
821 Location eloc
= expr
->location();
822 init
->push_back(Expression::make_cast(pvt
, expr
, eloc
));
824 Type
* type
= expr
->type()->points_to();
825 go_assert(type
!= NULL
);
828 Expression::make_type_info(type
,
829 Expression::TYPE_INFO_SIZE
);
830 init
->push_back(size
);
832 Expression
* ptrdata
=
833 Expression::make_type_info(type
,
834 Expression::TYPE_INFO_BACKEND_PTRDATA
);
835 init
->push_back(ptrdata
);
837 Expression
* gcdata
= Expression::make_ptrmask_symbol(type
);
838 init
->push_back(gcdata
);
840 Expression
* root_ctor
=
841 Expression::make_struct_composite_literal(root_type
, init
, eloc
);
842 roots_init
->push_back(root_ctor
);
845 // Build a constructor for the struct.
847 Expression_list
* root_list_init
= new Expression_list();
848 root_list_init
->push_back(Expression::make_nil(builtin_loc
));
849 root_list_init
->push_back(Expression::make_integer_ul(roots_len
, int_type
,
852 Expression
* roots_ctor
=
853 Expression::make_array_composite_literal(root_array_type
, roots_init
,
855 root_list_init
->push_back(roots_ctor
);
857 Expression
* root_list_ctor
=
858 Expression::make_struct_composite_literal(root_list_type
, root_list_init
,
861 Expression
* root_addr
= Expression::make_unary(OPERATOR_AND
, root_list_ctor
,
863 root_addr
->unary_expression()->set_is_gc_root();
864 Expression
* register_roots
= Runtime::make_call(Runtime::REGISTER_GC_ROOTS
,
865 builtin_loc
, 1, root_addr
);
867 Translate_context
context(this, NULL
, NULL
, NULL
);
868 Bexpression
* bcall
= register_roots
->get_backend(&context
);
869 init_stmts
.push_back(this->backend()->expression_statement(init_bfn
, bcall
));
872 // Build the decl for the initialization function.
875 Gogo::initialization_function_decl()
877 std::string name
= this->get_init_fn_name();
878 Location loc
= this->package_
->location();
880 Function_type
* fntype
= Type::make_function_type(NULL
, NULL
, NULL
, loc
);
881 Function
* initfn
= new Function(fntype
, NULL
, NULL
, loc
);
882 return Named_object::make_function(name
, NULL
, initfn
);
885 // Create the magic initialization function. CODE_STMT is the
886 // code that it needs to run.
889 Gogo::create_initialization_function(Named_object
* initfn
,
890 Bstatement
* code_stmt
)
892 // Make sure that we thought we needed an initialization function,
893 // as otherwise we will not have reported it in the export data.
894 go_assert(this->is_main_package() || this->need_init_fn_
);
897 initfn
= this->initialization_function_decl();
899 // Bind the initialization function code to a block.
900 Bfunction
* fndecl
= initfn
->func_value()->get_or_make_decl(this, initfn
);
901 Location pkg_loc
= this->package_
->location();
902 std::vector
<Bvariable
*> vars
;
903 this->backend()->block(fndecl
, NULL
, vars
, pkg_loc
, pkg_loc
);
905 if (!this->backend()->function_set_body(fndecl
, code_stmt
))
907 go_assert(saw_errors());
913 // Search for references to VAR in any statements or called functions.
915 class Find_var
: public Traverse
918 // A hash table we use to avoid looping. The index is the name of a
919 // named object. We only look through objects defined in this
921 typedef Unordered_set(const void*) Seen_objects
;
923 Find_var(Named_object
* var
, Seen_objects
* seen_objects
)
924 : Traverse(traverse_expressions
),
925 var_(var
), seen_objects_(seen_objects
), found_(false)
928 // Whether the variable was found.
931 { return this->found_
; }
934 expression(Expression
**);
937 // The variable we are looking for.
939 // Names of objects we have already seen.
940 Seen_objects
* seen_objects_
;
941 // True if the variable was found.
945 // See if EXPR refers to VAR, looking through function calls and
946 // variable initializations.
949 Find_var::expression(Expression
** pexpr
)
951 Expression
* e
= *pexpr
;
953 Var_expression
* ve
= e
->var_expression();
956 Named_object
* v
= ve
->named_object();
960 return TRAVERSE_EXIT
;
963 if (v
->is_variable() && v
->package() == NULL
)
965 Expression
* init
= v
->var_value()->init();
968 std::pair
<Seen_objects::iterator
, bool> ins
=
969 this->seen_objects_
->insert(v
);
972 // This is the first time we have seen this name.
973 if (Expression::traverse(&init
, this) == TRAVERSE_EXIT
)
974 return TRAVERSE_EXIT
;
980 // We traverse the code of any function or bound method we see. Note that
981 // this means that we will traverse the code of a function or bound method
982 // whose address is taken even if it is not called.
983 Func_expression
* fe
= e
->func_expression();
984 Bound_method_expression
* bme
= e
->bound_method_expression();
985 if (fe
!= NULL
|| bme
!= NULL
)
987 const Named_object
* f
= fe
!= NULL
? fe
->named_object() : bme
->function();
988 if (f
->is_function() && f
->package() == NULL
)
990 std::pair
<Seen_objects::iterator
, bool> ins
=
991 this->seen_objects_
->insert(f
);
994 // This is the first time we have seen this name.
995 if (f
->func_value()->block()->traverse(this) == TRAVERSE_EXIT
)
996 return TRAVERSE_EXIT
;
1001 Temporary_reference_expression
* tre
= e
->temporary_reference_expression();
1004 Temporary_statement
* ts
= tre
->statement();
1005 Expression
* init
= ts
->init();
1008 std::pair
<Seen_objects::iterator
, bool> ins
=
1009 this->seen_objects_
->insert(ts
);
1012 // This is the first time we have seen this temporary
1014 if (Expression::traverse(&init
, this) == TRAVERSE_EXIT
)
1015 return TRAVERSE_EXIT
;
1020 return TRAVERSE_CONTINUE
;
1023 // Return true if EXPR, PREINIT, or DEP refers to VAR.
1026 expression_requires(Expression
* expr
, Block
* preinit
, Named_object
* dep
,
1029 Find_var::Seen_objects seen_objects
;
1030 Find_var
find_var(var
, &seen_objects
);
1032 Expression::traverse(&expr
, &find_var
);
1033 if (preinit
!= NULL
)
1034 preinit
->traverse(&find_var
);
1037 Expression
* init
= dep
->var_value()->init();
1039 Expression::traverse(&init
, &find_var
);
1040 if (dep
->var_value()->has_pre_init())
1041 dep
->var_value()->preinit()->traverse(&find_var
);
1044 return find_var
.found();
1047 // Sort variable initializations. If the initialization expression
1048 // for variable A refers directly or indirectly to the initialization
1049 // expression for variable B, then we must initialize B before A.
1055 : var_(NULL
), init_(NULL
), dep_count_(0)
1058 Var_init(Named_object
* var
, Bstatement
* init
)
1059 : var_(var
), init_(init
), dep_count_(0)
1062 // Return the variable.
1065 { return this->var_
; }
1067 // Return the initialization expression.
1070 { return this->init_
; }
1072 // Return the number of remaining dependencies.
1075 { return this->dep_count_
; }
1077 // Increment the number of dependencies.
1080 { ++this->dep_count_
; }
1082 // Decrement the number of dependencies.
1085 { --this->dep_count_
; }
1088 // The variable being initialized.
1090 // The initialization statement.
1092 // The number of initializations this is dependent on. A variable
1093 // initialization should not be emitted if any of its dependencies
1094 // have not yet been resolved.
1098 // For comparing Var_init keys in a map.
1101 operator<(const Var_init
& v1
, const Var_init
& v2
)
1102 { return v1
.var()->name() < v2
.var()->name(); }
1104 typedef std::list
<Var_init
> Var_inits
;
1106 // Sort the variable initializations. The rule we follow is that we
1107 // emit them in the order they appear in the array, except that if the
1108 // initialization expression for a variable V1 depends upon another
1109 // variable V2 then we initialize V1 after V2.
1112 sort_var_inits(Gogo
* gogo
, Var_inits
* var_inits
)
1114 if (var_inits
->empty())
1117 typedef std::pair
<Named_object
*, Named_object
*> No_no
;
1118 typedef std::map
<No_no
, bool> Cache
;
1121 // A mapping from a variable initialization to a set of
1122 // variable initializations that depend on it.
1123 typedef std::map
<Var_init
, std::set
<Var_init
*> > Init_deps
;
1124 Init_deps init_deps
;
1125 bool init_loop
= false;
1126 for (Var_inits::iterator p1
= var_inits
->begin();
1127 p1
!= var_inits
->end();
1130 Named_object
* var
= p1
->var();
1131 Expression
* init
= var
->var_value()->init();
1132 Block
* preinit
= var
->var_value()->preinit();
1133 Named_object
* dep
= gogo
->var_depends_on(var
->var_value());
1135 // Start walking through the list to see which variables VAR
1136 // needs to wait for.
1137 for (Var_inits::iterator p2
= var_inits
->begin();
1138 p2
!= var_inits
->end();
1141 if (var
== p2
->var())
1144 Named_object
* p2var
= p2
->var();
1145 No_no
key(var
, p2var
);
1146 std::pair
<Cache::iterator
, bool> ins
=
1147 cache
.insert(std::make_pair(key
, false));
1149 ins
.first
->second
= expression_requires(init
, preinit
, dep
, p2var
);
1150 if (ins
.first
->second
)
1152 // VAR depends on P2VAR.
1153 init_deps
[*p2
].insert(&(*p1
));
1154 p1
->add_dependency();
1156 // Check for cycles.
1157 key
= std::make_pair(p2var
, var
);
1158 ins
= cache
.insert(std::make_pair(key
, false));
1161 expression_requires(p2var
->var_value()->init(),
1162 p2var
->var_value()->preinit(),
1163 gogo
->var_depends_on(p2var
->var_value()),
1165 if (ins
.first
->second
)
1167 go_error_at(var
->location(),
1168 ("initialization expressions for %qs and "
1169 "%qs depend upon each other"),
1170 var
->message_name().c_str(),
1171 p2var
->message_name().c_str());
1172 go_inform(p2
->var()->location(), "%qs defined here",
1173 p2var
->message_name().c_str());
1181 // If there are no dependencies then the declaration order is sorted.
1182 if (!init_deps
.empty() && !init_loop
)
1184 // Otherwise, sort variable initializations by emitting all variables with
1185 // no dependencies in declaration order. VAR_INITS is already in
1186 // declaration order.
1188 while (!var_inits
->empty())
1190 Var_inits::iterator v1
;;
1191 for (v1
= var_inits
->begin(); v1
!= var_inits
->end(); ++v1
)
1193 if (v1
->dep_count() == 0)
1196 go_assert(v1
!= var_inits
->end());
1198 // V1 either has no dependencies or its dependencies have already
1199 // been emitted, add it to READY next. When V1 is emitted, remove
1200 // a dependency from each V that depends on V1.
1201 ready
.splice(ready
.end(), *var_inits
, v1
);
1203 Init_deps::iterator p1
= init_deps
.find(*v1
);
1204 if (p1
!= init_deps
.end())
1206 std::set
<Var_init
*> resolved
= p1
->second
;
1207 for (std::set
<Var_init
*>::iterator pv
= resolved
.begin();
1208 pv
!= resolved
.end();
1210 (*pv
)->remove_dependency();
1211 init_deps
.erase(p1
);
1214 var_inits
->swap(ready
);
1215 go_assert(init_deps
.empty());
1218 // VAR_INITS is in the correct order. For each VAR in VAR_INITS,
1219 // check for a loop of VAR on itself.
1220 // interpret as a loop.
1221 for (Var_inits::const_iterator p
= var_inits
->begin();
1222 p
!= var_inits
->end();
1224 gogo
->check_self_dep(p
->var());
1227 // Give an error if the initialization expression for VAR depends on
1228 // itself. We only check if INIT is not NULL and there is no
1229 // dependency; when INIT is NULL, it means that PREINIT sets VAR,
1230 // which we will interpret as a loop.
1233 Gogo::check_self_dep(Named_object
* var
)
1235 Expression
* init
= var
->var_value()->init();
1236 Block
* preinit
= var
->var_value()->preinit();
1237 Named_object
* dep
= this->var_depends_on(var
->var_value());
1240 && expression_requires(init
, preinit
, NULL
, var
))
1241 go_error_at(var
->location(),
1242 "initialization expression for %qs depends upon itself",
1243 var
->message_name().c_str());
1246 // Write out the global definitions.
1249 Gogo::write_globals()
1251 this->build_interface_method_tables();
1253 Bindings
* bindings
= this->current_bindings();
1255 for (Bindings::const_declarations_iterator p
= bindings
->begin_declarations();
1256 p
!= bindings
->end_declarations();
1259 // If any function declarations needed a descriptor, make sure
1261 Named_object
* no
= p
->second
;
1262 if (no
->is_function_declaration())
1263 no
->func_declaration_value()->build_backend_descriptor(this);
1266 // Lists of globally declared types, variables, constants, and functions
1267 // that must be defined.
1268 std::vector
<Btype
*> type_decls
;
1269 std::vector
<Bvariable
*> var_decls
;
1270 std::vector
<Bexpression
*> const_decls
;
1271 std::vector
<Bfunction
*> func_decls
;
1273 // The init function declaration and associated Bfunction, if necessary.
1274 Named_object
* init_fndecl
= NULL
;
1275 Bfunction
* init_bfn
= NULL
;
1277 std::vector
<Bstatement
*> init_stmts
;
1278 std::vector
<Bstatement
*> var_init_stmts
;
1280 if (this->is_main_package())
1282 init_fndecl
= this->initialization_function_decl();
1283 init_bfn
= init_fndecl
->func_value()->get_or_make_decl(this, init_fndecl
);
1284 this->init_imports(init_stmts
, init_bfn
);
1287 // A list of variable initializations.
1288 Var_inits var_inits
;
1290 // A list of variables which need to be registered with the garbage
1292 size_t count_definitions
= bindings
->size_definitions();
1293 std::vector
<Named_object
*> var_gc
;
1294 var_gc
.reserve(count_definitions
);
1296 for (Bindings::const_definitions_iterator p
= bindings
->begin_definitions();
1297 p
!= bindings
->end_definitions();
1300 Named_object
* no
= *p
;
1301 go_assert(!no
->is_type_declaration() && !no
->is_function_declaration());
1303 // There is nothing to do for a package.
1304 if (no
->is_package())
1307 // There is nothing to do for an object which was imported from
1308 // a different package into the global scope.
1309 if (no
->package() != NULL
)
1312 // Skip blank named functions and constants.
1313 if ((no
->is_function() && no
->func_value()->is_sink())
1314 || (no
->is_const() && no
->const_value()->is_sink()))
1317 // There is nothing useful we can output for constants which
1318 // have ideal or non-integral type.
1321 Type
* type
= no
->const_value()->type();
1323 type
= no
->const_value()->expr()->type();
1324 if (type
->is_abstract() || !type
->is_numeric_type())
1328 if (!no
->is_variable())
1329 no
->get_backend(this, const_decls
, type_decls
, func_decls
);
1332 Variable
* var
= no
->var_value();
1333 Bvariable
* bvar
= no
->get_backend_variable(this, NULL
);
1334 var_decls
.push_back(bvar
);
1336 // Check for a sink variable, which may be used to run an
1337 // initializer purely for its side effects.
1338 bool is_sink
= no
->name()[0] == '_' && no
->name()[1] == '.';
1340 Bstatement
* var_init_stmt
= NULL
;
1341 if (!var
->has_pre_init())
1343 // If the backend representation of the variable initializer is
1344 // constant, we can just set the initial value using
1345 // global_var_set_init instead of during the init() function.
1346 // The initializer is constant if it is the zero-value of the
1347 // variable's type or if the initial value is an immutable value
1348 // that is not copied to the heap.
1349 bool is_static_initializer
= false;
1350 if (var
->init() == NULL
)
1351 is_static_initializer
= true;
1354 Type
* var_type
= var
->type();
1355 Expression
* init
= var
->init();
1356 Expression
* init_cast
=
1357 Expression::make_cast(var_type
, init
, var
->location());
1358 is_static_initializer
= init_cast
->is_static_initializer();
1361 // Non-constant variable initializations might need to create
1362 // temporary variables, which will need the initialization
1363 // function as context.
1364 Named_object
* var_init_fn
;
1365 if (is_static_initializer
)
1369 if (init_fndecl
== NULL
)
1371 init_fndecl
= this->initialization_function_decl();
1372 Function
* func
= init_fndecl
->func_value();
1373 init_bfn
= func
->get_or_make_decl(this, init_fndecl
);
1375 var_init_fn
= init_fndecl
;
1377 Bexpression
* var_binit
= var
->get_init(this, var_init_fn
);
1379 if (var_binit
== NULL
)
1381 else if (is_static_initializer
)
1383 if (expression_requires(var
->init(), NULL
,
1384 this->var_depends_on(var
), no
))
1385 go_error_at(no
->location(),
1386 "initialization expression for %qs depends "
1388 no
->message_name().c_str());
1389 this->backend()->global_variable_set_init(bvar
, var_binit
);
1393 this->backend()->expression_statement(init_bfn
, var_binit
);
1396 Location loc
= var
->location();
1397 Bexpression
* var_expr
=
1398 this->backend()->var_expression(bvar
, loc
);
1400 this->backend()->assignment_statement(init_bfn
, var_expr
,
1406 // We are going to create temporary variables which
1407 // means that we need an fndecl.
1408 if (init_fndecl
== NULL
)
1409 init_fndecl
= this->initialization_function_decl();
1411 Bvariable
* var_decl
= is_sink
? NULL
: bvar
;
1412 var_init_stmt
= var
->get_init_block(this, init_fndecl
, var_decl
);
1415 if (var_init_stmt
!= NULL
)
1417 if (var
->init() == NULL
&& !var
->has_pre_init())
1418 var_init_stmts
.push_back(var_init_stmt
);
1420 var_inits
.push_back(Var_init(no
, var_init_stmt
));
1422 else if (this->var_depends_on(var
) != NULL
)
1424 // This variable is initialized from something that is
1425 // not in its init or preinit. This variable needs to
1426 // participate in dependency analysis sorting, in case
1427 // some other variable depends on this one.
1428 Btype
* btype
= no
->var_value()->type()->get_backend(this);
1429 Bexpression
* zero
= this->backend()->zero_expression(btype
);
1430 Bstatement
* zero_stmt
=
1431 this->backend()->expression_statement(init_bfn
, zero
);
1432 var_inits
.push_back(Var_init(no
, zero_stmt
));
1435 // Collect a list of all global variables with pointers,
1436 // to register them for the garbage collector.
1437 if (!is_sink
&& var
->type()->has_pointer())
1439 // Avoid putting runtime.gcRoots itself on the list.
1440 if (this->compiling_runtime()
1441 && this->package_name() == "runtime"
1442 && Gogo::unpack_hidden_name(no
->name()) == "gcRoots")
1445 var_gc
.push_back(no
);
1450 // Register global variables with the garbage collector.
1451 this->register_gc_vars(var_gc
, init_stmts
, init_bfn
);
1453 // Simple variable initializations, after all variables are
1455 init_stmts
.push_back(this->backend()->statement_list(var_init_stmts
));
1457 // Complete variable initializations, first sorting them into a
1459 if (!var_inits
.empty())
1461 sort_var_inits(this, &var_inits
);
1462 for (Var_inits::const_iterator p
= var_inits
.begin();
1463 p
!= var_inits
.end();
1465 init_stmts
.push_back(p
->init());
1468 // After all the variables are initialized, call the init
1469 // functions if there are any. Init functions take no arguments, so
1470 // we pass in EMPTY_ARGS to call them.
1471 std::vector
<Bexpression
*> empty_args
;
1472 for (std::vector
<Named_object
*>::const_iterator p
=
1473 this->init_functions_
.begin();
1474 p
!= this->init_functions_
.end();
1477 Location func_loc
= (*p
)->location();
1478 Function
* func
= (*p
)->func_value();
1479 Bfunction
* initfn
= func
->get_or_make_decl(this, *p
);
1480 Bexpression
* func_code
=
1481 this->backend()->function_code_expression(initfn
, func_loc
);
1482 Bexpression
* call
= this->backend()->call_expression(init_bfn
, func_code
,
1485 Bstatement
* ist
= this->backend()->expression_statement(init_bfn
, call
);
1486 init_stmts
.push_back(ist
);
1489 // Set up a magic function to do all the initialization actions.
1490 // This will be called if this package is imported.
1491 Bstatement
* init_fncode
= this->backend()->statement_list(init_stmts
);
1492 if (this->need_init_fn_
|| this->is_main_package())
1495 this->create_initialization_function(init_fndecl
, init_fncode
);
1496 if (init_fndecl
!= NULL
)
1497 func_decls
.push_back(init_fndecl
->func_value()->get_decl());
1500 // We should not have seen any new bindings created during the conversion.
1501 go_assert(count_definitions
== this->current_bindings()->size_definitions());
1503 // Define all globally declared values.
1505 this->backend()->write_global_definitions(type_decls
, const_decls
,
1506 func_decls
, var_decls
);
1509 // Return the current block.
1512 Gogo::current_block()
1514 if (this->functions_
.empty())
1517 return this->functions_
.back().blocks
.back();
1520 // Look up a name in the current binding contour. If PFUNCTION is not
1521 // NULL, set it to the function in which the name is defined, or NULL
1522 // if the name is defined in global scope.
1525 Gogo::lookup(const std::string
& name
, Named_object
** pfunction
) const
1527 if (pfunction
!= NULL
)
1530 if (Gogo::is_sink_name(name
))
1531 return Named_object::make_sink();
1533 for (Open_functions::const_reverse_iterator p
= this->functions_
.rbegin();
1534 p
!= this->functions_
.rend();
1537 Named_object
* ret
= p
->blocks
.back()->bindings()->lookup(name
);
1540 if (pfunction
!= NULL
)
1541 *pfunction
= p
->function
;
1546 if (this->package_
!= NULL
)
1548 Named_object
* ret
= this->package_
->bindings()->lookup(name
);
1551 if (ret
->package() != NULL
)
1553 std::string dot_alias
= "." + ret
->package()->package_name();
1554 ret
->package()->note_usage(dot_alias
);
1560 // We do not look in the global namespace. If we did, the global
1561 // namespace would effectively hide names which were defined in
1562 // package scope which we have not yet seen. Instead,
1563 // define_global_names is called after parsing is over to connect
1564 // undefined names at package scope with names defined at global
1570 // Look up a name in the current block, without searching enclosing
1574 Gogo::lookup_in_block(const std::string
& name
) const
1576 go_assert(!this->functions_
.empty());
1577 go_assert(!this->functions_
.back().blocks
.empty());
1578 return this->functions_
.back().blocks
.back()->bindings()->lookup_local(name
);
1581 // Look up a name in the global namespace.
1584 Gogo::lookup_global(const char* name
) const
1586 return this->globals_
->lookup(name
);
1589 // Add an imported package.
1592 Gogo::add_imported_package(const std::string
& real_name
,
1593 const std::string
& alias_arg
,
1594 bool is_alias_exported
,
1595 const std::string
& pkgpath
,
1596 const std::string
& pkgpath_symbol
,
1598 bool* padd_to_globals
)
1600 Package
* ret
= this->register_package(pkgpath
, pkgpath_symbol
, location
);
1601 ret
->set_package_name(real_name
, location
);
1603 *padd_to_globals
= false;
1605 if (alias_arg
== "_")
1607 else if (alias_arg
== ".")
1609 *padd_to_globals
= true;
1610 std::string dot_alias
= "." + real_name
;
1611 ret
->add_alias(dot_alias
, location
);
1615 std::string alias
= alias_arg
;
1619 is_alias_exported
= Lex::is_exported_name(alias
);
1621 ret
->add_alias(alias
, location
);
1622 alias
= this->pack_hidden_name(alias
, is_alias_exported
);
1623 Named_object
* no
= this->package_
->bindings()->add_package(alias
, ret
);
1624 if (!no
->is_package())
1631 // Register a package. This package may or may not be imported. This
1632 // returns the Package structure for the package, creating if it
1633 // necessary. LOCATION is the location of the import statement that
1634 // led us to see this package. PKGPATH_SYMBOL is the symbol to use
1635 // for names in the package; it may be the empty string, in which case
1636 // we either get it later or make a guess when we need it.
1639 Gogo::register_package(const std::string
& pkgpath
,
1640 const std::string
& pkgpath_symbol
, Location location
)
1642 Package
* package
= NULL
;
1643 std::pair
<Packages::iterator
, bool> ins
=
1644 this->packages_
.insert(std::make_pair(pkgpath
, package
));
1647 // We have seen this package name before.
1648 package
= ins
.first
->second
;
1649 go_assert(package
!= NULL
&& package
->pkgpath() == pkgpath
);
1650 if (!pkgpath_symbol
.empty())
1651 package
->set_pkgpath_symbol(pkgpath_symbol
);
1652 if (Linemap::is_unknown_location(package
->location()))
1653 package
->set_location(location
);
1657 // First time we have seen this package name.
1658 package
= new Package(pkgpath
, pkgpath_symbol
, location
);
1659 go_assert(ins
.first
->second
== NULL
);
1660 ins
.first
->second
= package
;
1666 // Return the pkgpath symbol for a package, given the pkgpath.
1669 Gogo::pkgpath_symbol_for_package(const std::string
& pkgpath
)
1671 Packages::iterator p
= this->packages_
.find(pkgpath
);
1672 go_assert(p
!= this->packages_
.end());
1673 return p
->second
->pkgpath_symbol();
1676 // Start compiling a function.
1679 Gogo::start_function(const std::string
& name
, Function_type
* type
,
1680 bool add_method_to_type
, Location location
)
1682 bool at_top_level
= this->functions_
.empty();
1684 Block
* block
= new Block(NULL
, location
);
1686 Named_object
* enclosing
= (at_top_level
1688 : this->functions_
.back().function
);
1690 Function
* function
= new Function(type
, enclosing
, block
, location
);
1692 if (type
->is_method())
1694 const Typed_identifier
* receiver
= type
->receiver();
1695 Variable
* this_param
= new Variable(receiver
->type(), NULL
, false,
1696 true, true, location
);
1697 std::string rname
= receiver
->name();
1698 if (rname
.empty() || Gogo::is_sink_name(rname
))
1700 // We need to give receivers a name since they wind up in
1701 // DECL_ARGUMENTS. FIXME.
1702 static unsigned int count
;
1704 snprintf(buf
, sizeof buf
, "r.%u", count
);
1708 block
->bindings()->add_variable(rname
, NULL
, this_param
);
1711 const Typed_identifier_list
* parameters
= type
->parameters();
1712 bool is_varargs
= type
->is_varargs();
1713 if (parameters
!= NULL
)
1715 for (Typed_identifier_list::const_iterator p
= parameters
->begin();
1716 p
!= parameters
->end();
1719 Variable
* param
= new Variable(p
->type(), NULL
, false, true, false,
1721 if (is_varargs
&& p
+ 1 == parameters
->end())
1722 param
->set_is_varargs_parameter();
1724 std::string pname
= p
->name();
1725 if (pname
.empty() || Gogo::is_sink_name(pname
))
1727 // We need to give parameters a name since they wind up
1728 // in DECL_ARGUMENTS. FIXME.
1729 static unsigned int count
;
1731 snprintf(buf
, sizeof buf
, "p.%u", count
);
1735 block
->bindings()->add_variable(pname
, NULL
, param
);
1739 function
->create_result_variables(this);
1741 const std::string
* pname
;
1742 std::string nested_name
;
1743 bool is_init
= false;
1744 if (Gogo::unpack_hidden_name(name
) == "init" && !type
->is_method())
1746 if ((type
->parameters() != NULL
&& !type
->parameters()->empty())
1747 || (type
->results() != NULL
&& !type
->results()->empty()))
1748 go_error_at(location
,
1749 "func init must have no arguments and no return values");
1750 // There can be multiple "init" functions, so give them each a
1752 nested_name
= this->init_function_name();
1753 pname
= &nested_name
;
1756 else if (!name
.empty())
1760 // Invent a name for a nested function.
1761 nested_name
= this->nested_function_name();
1762 pname
= &nested_name
;
1766 if (Gogo::is_sink_name(*pname
))
1768 std::string
sname(this->sink_function_name());
1769 ret
= Named_object::make_function(sname
, NULL
, function
);
1770 ret
->func_value()->set_is_sink();
1772 if (!type
->is_method())
1773 ret
= this->package_
->bindings()->add_named_object(ret
);
1774 else if (add_method_to_type
)
1776 // We should report errors even for sink methods.
1777 Type
* rtype
= type
->receiver()->type();
1778 // Avoid points_to and deref to avoid getting an error if
1779 // the type is not yet defined.
1780 if (rtype
->classification() == Type::TYPE_POINTER
)
1781 rtype
= rtype
->points_to();
1782 while (rtype
->named_type() != NULL
1783 && rtype
->named_type()->is_alias())
1784 rtype
= rtype
->named_type()->real_type()->forwarded();
1785 if (rtype
->is_error_type())
1787 else if (rtype
->named_type() != NULL
)
1789 if (rtype
->named_type()->named_object()->package() != NULL
)
1790 go_error_at(type
->receiver()->location(),
1791 "may not define methods on non-local type");
1793 else if (rtype
->forward_declaration_type() != NULL
)
1795 // Go ahead and add the method in case we need to report
1796 // an error when we see the definition.
1797 rtype
->forward_declaration_type()->add_existing_method(ret
);
1800 go_error_at(type
->receiver()->location(),
1801 ("invalid receiver type "
1802 "(receiver must be a named type)"));
1805 else if (!type
->is_method())
1807 ret
= this->package_
->bindings()->add_function(*pname
, NULL
, function
);
1808 if (!ret
->is_function() || ret
->func_value() != function
)
1810 // Redefinition error. Invent a name to avoid knockon
1812 std::string
rname(this->redefined_function_name());
1813 ret
= this->package_
->bindings()->add_function(rname
, NULL
, function
);
1818 if (!add_method_to_type
)
1819 ret
= Named_object::make_function(name
, NULL
, function
);
1822 go_assert(at_top_level
);
1823 Type
* rtype
= type
->receiver()->type();
1825 // We want to look through the pointer created by the
1826 // parser, without getting an error if the type is not yet
1828 if (rtype
->classification() == Type::TYPE_POINTER
)
1829 rtype
= rtype
->points_to();
1831 while (rtype
->named_type() != NULL
1832 && rtype
->named_type()->is_alias())
1833 rtype
= rtype
->named_type()->real_type()->forwarded();
1835 if (rtype
->is_error_type())
1836 ret
= Named_object::make_function(name
, NULL
, function
);
1837 else if (rtype
->named_type() != NULL
)
1839 if (rtype
->named_type()->named_object()->package() != NULL
)
1841 go_error_at(type
->receiver()->location(),
1842 "may not define methods on non-local type");
1843 ret
= Named_object::make_function(name
, NULL
, function
);
1847 ret
= rtype
->named_type()->add_method(name
, function
);
1848 if (!ret
->is_function())
1850 // Redefinition error.
1851 ret
= Named_object::make_function(name
, NULL
, function
);
1855 else if (rtype
->forward_declaration_type() != NULL
)
1857 Named_object
* type_no
=
1858 rtype
->forward_declaration_type()->named_object();
1859 if (type_no
->is_unknown())
1861 // If we are seeing methods it really must be a
1862 // type. Declare it as such. An alternative would
1863 // be to support lists of methods for unknown
1864 // expressions. Either way the error messages if
1865 // this is not a type are going to get confusing.
1866 Named_object
* declared
=
1867 this->declare_package_type(type_no
->name(),
1868 type_no
->location());
1870 == type_no
->unknown_value()->real_named_object());
1872 ret
= rtype
->forward_declaration_type()->add_method(name
,
1877 go_error_at(type
->receiver()->location(),
1878 ("invalid receiver type (receiver must "
1879 "be a named type)"));
1880 ret
= Named_object::make_function(name
, NULL
, function
);
1883 this->package_
->bindings()->add_method(ret
);
1886 this->functions_
.resize(this->functions_
.size() + 1);
1887 Open_function
& of(this->functions_
.back());
1889 of
.blocks
.push_back(block
);
1893 this->init_functions_
.push_back(ret
);
1894 this->need_init_fn_
= true;
1900 // Finish compiling a function.
1903 Gogo::finish_function(Location location
)
1905 this->finish_block(location
);
1906 go_assert(this->functions_
.back().blocks
.empty());
1907 this->functions_
.pop_back();
1910 // Return the current function.
1913 Gogo::current_function() const
1915 go_assert(!this->functions_
.empty());
1916 return this->functions_
.back().function
;
1919 // Start a new block.
1922 Gogo::start_block(Location location
)
1924 go_assert(!this->functions_
.empty());
1925 Block
* block
= new Block(this->current_block(), location
);
1926 this->functions_
.back().blocks
.push_back(block
);
1932 Gogo::finish_block(Location location
)
1934 go_assert(!this->functions_
.empty());
1935 go_assert(!this->functions_
.back().blocks
.empty());
1936 Block
* block
= this->functions_
.back().blocks
.back();
1937 this->functions_
.back().blocks
.pop_back();
1938 block
->set_end_location(location
);
1942 // Add an erroneous name.
1945 Gogo::add_erroneous_name(const std::string
& name
)
1947 return this->package_
->bindings()->add_erroneous_name(name
);
1950 // Add an unknown name.
1953 Gogo::add_unknown_name(const std::string
& name
, Location location
)
1955 return this->package_
->bindings()->add_unknown_name(name
, location
);
1958 // Declare a function.
1961 Gogo::declare_function(const std::string
& name
, Function_type
* type
,
1964 if (!type
->is_method())
1965 return this->current_bindings()->add_function_declaration(name
, NULL
, type
,
1969 // We don't bother to add this to the list of global
1971 Type
* rtype
= type
->receiver()->type();
1973 // We want to look through the pointer created by the
1974 // parser, without getting an error if the type is not yet
1976 if (rtype
->classification() == Type::TYPE_POINTER
)
1977 rtype
= rtype
->points_to();
1979 if (rtype
->is_error_type())
1981 else if (rtype
->named_type() != NULL
)
1982 return rtype
->named_type()->add_method_declaration(name
, NULL
, type
,
1984 else if (rtype
->forward_declaration_type() != NULL
)
1986 Forward_declaration_type
* ftype
= rtype
->forward_declaration_type();
1987 return ftype
->add_method_declaration(name
, NULL
, type
, location
);
1991 go_error_at(type
->receiver()->location(),
1992 "invalid receiver type (receiver must be a named type)");
1993 return Named_object::make_erroneous_name(name
);
1998 // Add a label definition.
2001 Gogo::add_label_definition(const std::string
& label_name
,
2004 go_assert(!this->functions_
.empty());
2005 Function
* func
= this->functions_
.back().function
->func_value();
2006 Label
* label
= func
->add_label_definition(this, label_name
, location
);
2007 this->add_statement(Statement::make_label_statement(label
, location
));
2011 // Add a label reference.
2014 Gogo::add_label_reference(const std::string
& label_name
,
2015 Location location
, bool issue_goto_errors
)
2017 go_assert(!this->functions_
.empty());
2018 Function
* func
= this->functions_
.back().function
->func_value();
2019 return func
->add_label_reference(this, label_name
, location
,
2023 // Return the current binding state.
2026 Gogo::bindings_snapshot(Location location
)
2028 return new Bindings_snapshot(this->current_block(), location
);
2034 Gogo::add_statement(Statement
* statement
)
2036 go_assert(!this->functions_
.empty()
2037 && !this->functions_
.back().blocks
.empty());
2038 this->functions_
.back().blocks
.back()->add_statement(statement
);
2044 Gogo::add_block(Block
* block
, Location location
)
2046 go_assert(!this->functions_
.empty()
2047 && !this->functions_
.back().blocks
.empty());
2048 Statement
* statement
= Statement::make_block_statement(block
, location
);
2049 this->functions_
.back().blocks
.back()->add_statement(statement
);
2055 Gogo::add_constant(const Typed_identifier
& tid
, Expression
* expr
,
2058 return this->current_bindings()->add_constant(tid
, NULL
, expr
, iota_value
);
2064 Gogo::add_type(const std::string
& name
, Type
* type
, Location location
)
2066 Named_object
* no
= this->current_bindings()->add_type(name
, NULL
, type
,
2068 if (!this->in_global_scope() && no
->is_type())
2070 Named_object
* f
= this->functions_
.back().function
;
2072 if (f
->is_function())
2073 index
= f
->func_value()->new_local_type_index();
2076 no
->type_value()->set_in_function(f
, index
);
2080 // Add a named type.
2083 Gogo::add_named_type(Named_type
* type
)
2085 go_assert(this->in_global_scope());
2086 this->current_bindings()->add_named_type(type
);
2092 Gogo::declare_type(const std::string
& name
, Location location
)
2094 Bindings
* bindings
= this->current_bindings();
2095 Named_object
* no
= bindings
->add_type_declaration(name
, NULL
, location
);
2096 if (!this->in_global_scope() && no
->is_type_declaration())
2098 Named_object
* f
= this->functions_
.back().function
;
2100 if (f
->is_function())
2101 index
= f
->func_value()->new_local_type_index();
2104 no
->type_declaration_value()->set_in_function(f
, index
);
2109 // Declare a type at the package level.
2112 Gogo::declare_package_type(const std::string
& name
, Location location
)
2114 return this->package_
->bindings()->add_type_declaration(name
, NULL
, location
);
2117 // Declare a function at the package level.
2120 Gogo::declare_package_function(const std::string
& name
, Function_type
* type
,
2123 return this->package_
->bindings()->add_function_declaration(name
, NULL
, type
,
2127 // Define a type which was already declared.
2130 Gogo::define_type(Named_object
* no
, Named_type
* type
)
2132 this->current_bindings()->define_type(no
, type
);
2138 Gogo::add_variable(const std::string
& name
, Variable
* variable
)
2140 Named_object
* no
= this->current_bindings()->add_variable(name
, NULL
,
2143 // In a function the middle-end wants to see a DECL_EXPR node.
2145 && no
->is_variable()
2146 && !no
->var_value()->is_parameter()
2147 && !this->functions_
.empty())
2148 this->add_statement(Statement::make_variable_declaration(no
));
2153 // Add a sink--a reference to the blank identifier _.
2158 return Named_object::make_sink();
2161 // Add a named object for a dot import.
2164 Gogo::add_dot_import_object(Named_object
* no
)
2166 // If the name already exists, then it was defined in some file seen
2167 // earlier. If the earlier name is just a declaration, don't add
2168 // this name, because that will cause the previous declaration to
2169 // merge to this imported name, which should not happen. Just add
2170 // this name to the list of file block names to get appropriate
2171 // errors if we see a later definition.
2172 Named_object
* e
= this->package_
->bindings()->lookup(no
->name());
2173 if (e
!= NULL
&& e
->package() == NULL
)
2175 if (e
->is_unknown())
2177 if (e
->package() == NULL
2178 && (e
->is_type_declaration()
2179 || e
->is_function_declaration()
2180 || e
->is_unknown()))
2182 this->add_file_block_name(no
->name(), no
->location());
2187 this->current_bindings()->add_named_object(no
);
2190 // Add a linkname. This implements the go:linkname compiler directive.
2191 // We only support this for functions and function declarations.
2194 Gogo::add_linkname(const std::string
& go_name
, bool is_exported
,
2195 const std::string
& ext_name
, Location loc
)
2198 this->package_
->bindings()->lookup(this->pack_hidden_name(go_name
,
2201 go_error_at(loc
, "%s is not defined", go_name
.c_str());
2202 else if (no
->is_function())
2203 no
->func_value()->set_asm_name(ext_name
);
2204 else if (no
->is_function_declaration())
2205 no
->func_declaration_value()->set_asm_name(ext_name
);
2208 ("%s is not a function; "
2209 "//go:linkname is only supported for functions"),
2213 // Mark all local variables used. This is used when some types of
2214 // parse error occur.
2217 Gogo::mark_locals_used()
2219 for (Open_functions::iterator pf
= this->functions_
.begin();
2220 pf
!= this->functions_
.end();
2223 for (std::vector
<Block
*>::iterator pb
= pf
->blocks
.begin();
2224 pb
!= pf
->blocks
.end();
2226 (*pb
)->bindings()->mark_locals_used();
2230 // Record that we've seen an interface type.
2233 Gogo::record_interface_type(Interface_type
* itype
)
2235 this->interface_types_
.push_back(itype
);
2238 // Define the global names. We do this only after parsing all the
2239 // input files, because the program might define the global names
2243 Gogo::define_global_names()
2245 if (this->is_main_package())
2247 // Every Go program has to import the runtime package, so that
2248 // it is properly initialized.
2249 this->import_package("runtime", "_", false, false,
2250 Linemap::predeclared_location());
2253 for (Bindings::const_declarations_iterator p
=
2254 this->globals_
->begin_declarations();
2255 p
!= this->globals_
->end_declarations();
2258 Named_object
* global_no
= p
->second
;
2259 std::string
name(Gogo::pack_hidden_name(global_no
->name(), false));
2260 Named_object
* no
= this->package_
->bindings()->lookup(name
);
2264 if (no
->is_type_declaration())
2266 if (global_no
->is_type())
2268 if (no
->type_declaration_value()->has_methods())
2270 for (std::vector
<Named_object
*>::const_iterator p
=
2271 no
->type_declaration_value()->methods()->begin();
2272 p
!= no
->type_declaration_value()->methods()->end();
2274 go_error_at((*p
)->location(),
2275 "may not define methods on non-local type");
2277 no
->set_type_value(global_no
->type_value());
2281 go_error_at(no
->location(), "expected type");
2282 Type
* errtype
= Type::make_error_type();
2284 Named_object::make_type("erroneous_type", NULL
, errtype
,
2285 Linemap::predeclared_location());
2286 no
->set_type_value(err
->type_value());
2289 else if (no
->is_unknown())
2290 no
->unknown_value()->set_real_named_object(global_no
);
2293 // Give an error if any name is defined in both the package block
2294 // and the file block. For example, this can happen if one file
2295 // imports "fmt" and another file defines a global variable fmt.
2296 for (Bindings::const_declarations_iterator p
=
2297 this->package_
->bindings()->begin_declarations();
2298 p
!= this->package_
->bindings()->end_declarations();
2301 if (p
->second
->is_unknown()
2302 && p
->second
->unknown_value()->real_named_object() == NULL
)
2304 // No point in warning about an undefined name, as we will
2305 // get other errors later anyhow.
2308 File_block_names::const_iterator pf
=
2309 this->file_block_names_
.find(p
->second
->name());
2310 if (pf
!= this->file_block_names_
.end())
2312 std::string n
= p
->second
->message_name();
2313 go_error_at(p
->second
->location(),
2314 "%qs defined as both imported name and global name",
2316 go_inform(pf
->second
, "%qs imported here", n
.c_str());
2319 // No package scope identifier may be named "init".
2320 if (!p
->second
->is_function()
2321 && Gogo::unpack_hidden_name(p
->second
->name()) == "init")
2323 go_error_at(p
->second
->location(),
2324 "cannot declare init - must be func");
2329 // Clear out names in file scope.
2332 Gogo::clear_file_scope()
2334 this->package_
->bindings()->clear_file_scope(this);
2336 // Warn about packages which were imported but not used.
2337 bool quiet
= saw_errors();
2338 for (Packages::iterator p
= this->packages_
.begin();
2339 p
!= this->packages_
.end();
2342 Package
* package
= p
->second
;
2343 if (package
!= this->package_
&& !quiet
)
2345 for (Package::Aliases::const_iterator p1
= package
->aliases().begin();
2346 p1
!= package
->aliases().end();
2349 if (!p1
->second
->used())
2351 // Give a more refined error message if the alias name is known.
2352 std::string pkg_name
= package
->package_name();
2353 if (p1
->first
!= pkg_name
&& p1
->first
[0] != '.')
2355 go_error_at(p1
->second
->location(),
2356 "imported and not used: %s as %s",
2357 Gogo::message_name(pkg_name
).c_str(),
2358 Gogo::message_name(p1
->first
).c_str());
2361 go_error_at(p1
->second
->location(),
2362 "imported and not used: %s",
2363 Gogo::message_name(pkg_name
).c_str());
2367 package
->clear_used();
2370 this->current_file_imported_unsafe_
= false;
2373 // Queue up a type specific function for later writing. These are
2374 // written out in write_specific_type_functions, called after the
2375 // parse tree is lowered.
2378 Gogo::queue_specific_type_function(Type
* type
, Named_type
* name
, int64_t size
,
2379 const std::string
& hash_name
,
2380 Function_type
* hash_fntype
,
2381 const std::string
& equal_name
,
2382 Function_type
* equal_fntype
)
2384 go_assert(!this->specific_type_functions_are_written_
);
2385 go_assert(!this->in_global_scope());
2386 Specific_type_function
* tsf
= new Specific_type_function(type
, name
, size
,
2391 this->specific_type_functions_
.push_back(tsf
);
2394 // Look for types which need specific hash or equality functions.
2396 class Specific_type_functions
: public Traverse
2399 Specific_type_functions(Gogo
* gogo
)
2400 : Traverse(traverse_types
),
2412 Specific_type_functions::type(Type
* t
)
2414 Named_object
* hash_fn
;
2415 Named_object
* equal_fn
;
2416 switch (t
->classification())
2418 case Type::TYPE_NAMED
:
2420 Named_type
* nt
= t
->named_type();
2422 return TRAVERSE_CONTINUE
;
2423 if (t
->needs_specific_type_functions(this->gogo_
))
2424 t
->type_functions(this->gogo_
, nt
, NULL
, NULL
, &hash_fn
, &equal_fn
);
2426 // If this is a struct type, we don't want to make functions
2427 // for the unnamed struct.
2428 Type
* rt
= nt
->real_type();
2429 if (rt
->struct_type() == NULL
)
2431 if (Type::traverse(rt
, this) == TRAVERSE_EXIT
)
2432 return TRAVERSE_EXIT
;
2436 // If this type is defined in another package, then we don't
2437 // need to worry about the unexported fields.
2438 bool is_defined_elsewhere
= nt
->named_object()->package() != NULL
;
2439 const Struct_field_list
* fields
= rt
->struct_type()->fields();
2440 for (Struct_field_list::const_iterator p
= fields
->begin();
2444 if (is_defined_elsewhere
2445 && Gogo::is_hidden_name(p
->field_name()))
2447 if (Type::traverse(p
->type(), this) == TRAVERSE_EXIT
)
2448 return TRAVERSE_EXIT
;
2452 return TRAVERSE_SKIP_COMPONENTS
;
2455 case Type::TYPE_STRUCT
:
2456 case Type::TYPE_ARRAY
:
2457 if (t
->needs_specific_type_functions(this->gogo_
))
2458 t
->type_functions(this->gogo_
, NULL
, NULL
, NULL
, &hash_fn
, &equal_fn
);
2465 return TRAVERSE_CONTINUE
;
2468 // Write out type specific functions.
2471 Gogo::write_specific_type_functions()
2473 Specific_type_functions
stf(this);
2474 this->traverse(&stf
);
2476 while (!this->specific_type_functions_
.empty())
2478 Specific_type_function
* tsf
= this->specific_type_functions_
.back();
2479 this->specific_type_functions_
.pop_back();
2480 tsf
->type
->write_specific_type_functions(this, tsf
->name
, tsf
->size
,
2487 this->specific_type_functions_are_written_
= true;
2490 // Traverse the tree.
2493 Gogo::traverse(Traverse
* traverse
)
2495 // Traverse the current package first for consistency. The other
2496 // packages will only contain imported types, constants, and
2498 if (this->package_
->bindings()->traverse(traverse
, true) == TRAVERSE_EXIT
)
2500 for (Packages::const_iterator p
= this->packages_
.begin();
2501 p
!= this->packages_
.end();
2504 if (p
->second
!= this->package_
)
2506 if (p
->second
->bindings()->traverse(traverse
, true) == TRAVERSE_EXIT
)
2512 // Add a type to verify. This is used for types of sink variables, in
2513 // order to give appropriate error messages.
2516 Gogo::add_type_to_verify(Type
* type
)
2518 this->verify_types_
.push_back(type
);
2521 // Traversal class used to verify types.
2523 class Verify_types
: public Traverse
2527 : Traverse(traverse_types
)
2534 // Verify that a type is correct.
2537 Verify_types::type(Type
* t
)
2540 return TRAVERSE_SKIP_COMPONENTS
;
2541 return TRAVERSE_CONTINUE
;
2544 // Verify that all types are correct.
2547 Gogo::verify_types()
2549 Verify_types traverse
;
2550 this->traverse(&traverse
);
2552 for (std::vector
<Type
*>::iterator p
= this->verify_types_
.begin();
2553 p
!= this->verify_types_
.end();
2556 this->verify_types_
.clear();
2559 // Traversal class used to lower parse tree.
2561 class Lower_parse_tree
: public Traverse
2564 Lower_parse_tree(Gogo
* gogo
, Named_object
* function
)
2565 : Traverse(traverse_variables
2566 | traverse_constants
2567 | traverse_functions
2568 | traverse_statements
2569 | traverse_expressions
),
2570 gogo_(gogo
), function_(function
), iota_value_(-1), inserter_()
2574 set_inserter(const Statement_inserter
* inserter
)
2575 { this->inserter_
= *inserter
; }
2578 variable(Named_object
*);
2581 constant(Named_object
*, bool);
2584 function(Named_object
*);
2587 statement(Block
*, size_t* pindex
, Statement
*);
2590 expression(Expression
**);
2595 // The function we are traversing.
2596 Named_object
* function_
;
2597 // Value to use for the predeclared constant iota.
2599 // Current statement inserter for use by expressions.
2600 Statement_inserter inserter_
;
2606 Lower_parse_tree::variable(Named_object
* no
)
2608 if (!no
->is_variable())
2609 return TRAVERSE_CONTINUE
;
2611 if (no
->is_variable() && no
->var_value()->is_global())
2613 // Global variables can have loops in their initialization
2614 // expressions. This is handled in lower_init_expression.
2615 no
->var_value()->lower_init_expression(this->gogo_
, this->function_
,
2617 return TRAVERSE_CONTINUE
;
2620 // This is a local variable. We are going to return
2621 // TRAVERSE_SKIP_COMPONENTS here because we want to traverse the
2622 // initialization expression when we reach the variable declaration
2623 // statement. However, that means that we need to traverse the type
2625 if (no
->var_value()->has_type())
2627 Type
* type
= no
->var_value()->type();
2630 if (Type::traverse(type
, this) == TRAVERSE_EXIT
)
2631 return TRAVERSE_EXIT
;
2634 go_assert(!no
->var_value()->has_pre_init());
2636 return TRAVERSE_SKIP_COMPONENTS
;
2639 // Lower constants. We handle constants specially so that we can set
2640 // the right value for the predeclared constant iota. This works in
2641 // conjunction with the way we lower Const_expression objects.
2644 Lower_parse_tree::constant(Named_object
* no
, bool)
2646 Named_constant
* nc
= no
->const_value();
2648 // Don't get into trouble if the constant's initializer expression
2649 // refers to the constant itself.
2651 return TRAVERSE_CONTINUE
;
2654 go_assert(this->iota_value_
== -1);
2655 this->iota_value_
= nc
->iota_value();
2656 nc
->traverse_expression(this);
2657 this->iota_value_
= -1;
2659 nc
->clear_lowering();
2661 // We will traverse the expression a second time, but that will be
2664 return TRAVERSE_CONTINUE
;
2667 // Lower the body of a function, and set the closure type. Record the
2668 // function while lowering it, so that we can pass it down when
2669 // lowering an expression.
2672 Lower_parse_tree::function(Named_object
* no
)
2674 no
->func_value()->set_closure_type();
2676 go_assert(this->function_
== NULL
);
2677 this->function_
= no
;
2678 int t
= no
->func_value()->traverse(this);
2679 this->function_
= NULL
;
2681 if (t
== TRAVERSE_EXIT
)
2683 return TRAVERSE_SKIP_COMPONENTS
;
2686 // Lower statement parse trees.
2689 Lower_parse_tree::statement(Block
* block
, size_t* pindex
, Statement
* sorig
)
2691 // Because we explicitly traverse the statement's contents
2692 // ourselves, we want to skip block statements here. There is
2693 // nothing to lower in a block statement.
2694 if (sorig
->is_block_statement())
2695 return TRAVERSE_CONTINUE
;
2697 Statement_inserter
hold_inserter(this->inserter_
);
2698 this->inserter_
= Statement_inserter(block
, pindex
);
2700 // Lower the expressions first.
2701 int t
= sorig
->traverse_contents(this);
2702 if (t
== TRAVERSE_EXIT
)
2704 this->inserter_
= hold_inserter
;
2708 // Keep lowering until nothing changes.
2709 Statement
* s
= sorig
;
2712 Statement
* snew
= s
->lower(this->gogo_
, this->function_
, block
,
2717 t
= s
->traverse_contents(this);
2718 if (t
== TRAVERSE_EXIT
)
2720 this->inserter_
= hold_inserter
;
2726 block
->replace_statement(*pindex
, s
);
2728 this->inserter_
= hold_inserter
;
2729 return TRAVERSE_SKIP_COMPONENTS
;
2732 // Lower expression parse trees.
2735 Lower_parse_tree::expression(Expression
** pexpr
)
2737 // We have to lower all subexpressions first, so that we can get
2738 // their type if necessary. This is awkward, because we don't have
2739 // a postorder traversal pass.
2740 if ((*pexpr
)->traverse_subexpressions(this) == TRAVERSE_EXIT
)
2741 return TRAVERSE_EXIT
;
2742 // Keep lowering until nothing changes.
2745 Expression
* e
= *pexpr
;
2746 Expression
* enew
= e
->lower(this->gogo_
, this->function_
,
2747 &this->inserter_
, this->iota_value_
);
2750 if (enew
->traverse_subexpressions(this) == TRAVERSE_EXIT
)
2751 return TRAVERSE_EXIT
;
2754 return TRAVERSE_SKIP_COMPONENTS
;
2757 // Lower the parse tree. This is called after the parse is complete,
2758 // when all names should be resolved.
2761 Gogo::lower_parse_tree()
2763 Lower_parse_tree
lower_parse_tree(this, NULL
);
2764 this->traverse(&lower_parse_tree
);
2766 // There might be type definitions that involve expressions such as the
2767 // array length. Make sure to lower these expressions as well. Otherwise,
2768 // errors hidden within a type can introduce unexpected errors into later
2770 for (std::vector
<Type
*>::iterator p
= this->verify_types_
.begin();
2771 p
!= this->verify_types_
.end();
2773 Type::traverse(*p
, &lower_parse_tree
);
2779 Gogo::lower_block(Named_object
* function
, Block
* block
)
2781 Lower_parse_tree
lower_parse_tree(this, function
);
2782 block
->traverse(&lower_parse_tree
);
2785 // Lower an expression. INSERTER may be NULL, in which case the
2786 // expression had better not need to create any temporaries.
2789 Gogo::lower_expression(Named_object
* function
, Statement_inserter
* inserter
,
2792 Lower_parse_tree
lower_parse_tree(this, function
);
2793 if (inserter
!= NULL
)
2794 lower_parse_tree
.set_inserter(inserter
);
2795 lower_parse_tree
.expression(pexpr
);
2798 // Lower a constant. This is called when lowering a reference to a
2799 // constant. We have to make sure that the constant has already been
2803 Gogo::lower_constant(Named_object
* no
)
2805 go_assert(no
->is_const());
2806 Lower_parse_tree
lower(this, NULL
);
2807 lower
.constant(no
, false);
2810 // Traverse the tree to create function descriptors as needed.
2812 class Create_function_descriptors
: public Traverse
2815 Create_function_descriptors(Gogo
* gogo
)
2816 : Traverse(traverse_functions
| traverse_expressions
),
2821 function(Named_object
*);
2824 expression(Expression
**);
2830 // Create a descriptor for every top-level exported function.
2833 Create_function_descriptors::function(Named_object
* no
)
2835 if (no
->is_function()
2836 && no
->func_value()->enclosing() == NULL
2837 && !no
->func_value()->is_method()
2838 && !Gogo::is_hidden_name(no
->name())
2839 && !Gogo::is_thunk(no
))
2840 no
->func_value()->descriptor(this->gogo_
, no
);
2842 return TRAVERSE_CONTINUE
;
2845 // If we see a function referenced in any way other than calling it,
2846 // create a descriptor for it.
2849 Create_function_descriptors::expression(Expression
** pexpr
)
2851 Expression
* expr
= *pexpr
;
2853 Func_expression
* fe
= expr
->func_expression();
2856 // We would not get here for a call to this function, so this is
2857 // a reference to a function other than calling it. We need a
2859 if (fe
->closure() != NULL
)
2860 return TRAVERSE_CONTINUE
;
2861 Named_object
* no
= fe
->named_object();
2862 if (no
->is_function() && !no
->func_value()->is_method())
2863 no
->func_value()->descriptor(this->gogo_
, no
);
2864 else if (no
->is_function_declaration()
2865 && !no
->func_declaration_value()->type()->is_method()
2866 && !Linemap::is_predeclared_location(no
->location()))
2867 no
->func_declaration_value()->descriptor(this->gogo_
, no
);
2868 return TRAVERSE_CONTINUE
;
2871 Bound_method_expression
* bme
= expr
->bound_method_expression();
2874 // We would not get here for a call to this method, so this is a
2875 // method value. We need to create a thunk.
2876 Bound_method_expression::create_thunk(this->gogo_
, bme
->method(),
2878 return TRAVERSE_CONTINUE
;
2881 Interface_field_reference_expression
* ifre
=
2882 expr
->interface_field_reference_expression();
2885 // We would not get here for a call to this interface method, so
2886 // this is a method value. We need to create a thunk.
2887 Interface_type
* type
= ifre
->expr()->type()->interface_type();
2889 Interface_field_reference_expression::create_thunk(this->gogo_
, type
,
2891 return TRAVERSE_CONTINUE
;
2894 Call_expression
* ce
= expr
->call_expression();
2897 Expression
* fn
= ce
->fn();
2898 if (fn
->func_expression() != NULL
2899 || fn
->bound_method_expression() != NULL
2900 || fn
->interface_field_reference_expression() != NULL
)
2902 // Traverse the arguments but not the function.
2903 Expression_list
* args
= ce
->args();
2906 if (args
->traverse(this) == TRAVERSE_EXIT
)
2907 return TRAVERSE_EXIT
;
2909 return TRAVERSE_SKIP_COMPONENTS
;
2913 return TRAVERSE_CONTINUE
;
2916 // Create function descriptors as needed. We need a function
2917 // descriptor for all exported functions and for all functions that
2918 // are referenced without being called.
2921 Gogo::create_function_descriptors()
2923 // Create a function descriptor for any exported function that is
2924 // declared in this package. This is so that we have a descriptor
2925 // for functions written in assembly. Gather the descriptors first
2926 // so that we don't add declarations while looping over them.
2927 std::vector
<Named_object
*> fndecls
;
2928 Bindings
* b
= this->package_
->bindings();
2929 for (Bindings::const_declarations_iterator p
= b
->begin_declarations();
2930 p
!= b
->end_declarations();
2933 Named_object
* no
= p
->second
;
2934 if (no
->is_function_declaration()
2935 && !no
->func_declaration_value()->type()->is_method()
2936 && !Linemap::is_predeclared_location(no
->location())
2937 && !Gogo::is_hidden_name(no
->name()))
2938 fndecls
.push_back(no
);
2940 for (std::vector
<Named_object
*>::const_iterator p
= fndecls
.begin();
2943 (*p
)->func_declaration_value()->descriptor(this, *p
);
2946 Create_function_descriptors
cfd(this);
2947 this->traverse(&cfd
);
2950 // Look for interface types to finalize methods of inherited
2953 class Finalize_methods
: public Traverse
2956 Finalize_methods(Gogo
* gogo
)
2957 : Traverse(traverse_types
),
2968 // Finalize the methods of an interface type.
2971 Finalize_methods::type(Type
* t
)
2973 // Check the classification so that we don't finalize the methods
2974 // twice for a named interface type.
2975 switch (t
->classification())
2977 case Type::TYPE_INTERFACE
:
2978 t
->interface_type()->finalize_methods();
2981 case Type::TYPE_NAMED
:
2983 Named_type
* nt
= t
->named_type();
2984 Type
* rt
= nt
->real_type();
2985 if (rt
->classification() != Type::TYPE_STRUCT
)
2987 // Finalize the methods of the real type first.
2988 if (Type::traverse(rt
, this) == TRAVERSE_EXIT
)
2989 return TRAVERSE_EXIT
;
2991 // Finalize the methods of this type.
2992 nt
->finalize_methods(this->gogo_
);
2996 // We don't want to finalize the methods of a named struct
2997 // type, as the methods should be attached to the named
2998 // type, not the struct type. We just want to finalize
3001 // It is possible that a field type refers indirectly to
3002 // this type, such as via a field with function type with
3003 // an argument or result whose type is this type. To
3004 // avoid the cycle, first finalize the methods of any
3005 // embedded types, which are the only types we need to
3006 // know to finalize the methods of this type.
3007 const Struct_field_list
* fields
= rt
->struct_type()->fields();
3010 for (Struct_field_list::const_iterator pf
= fields
->begin();
3011 pf
!= fields
->end();
3014 if (pf
->is_anonymous())
3016 if (Type::traverse(pf
->type(), this) == TRAVERSE_EXIT
)
3017 return TRAVERSE_EXIT
;
3022 // Finalize the methods of this type.
3023 nt
->finalize_methods(this->gogo_
);
3025 // Finalize all the struct fields.
3026 if (rt
->struct_type()->traverse_field_types(this) == TRAVERSE_EXIT
)
3027 return TRAVERSE_EXIT
;
3030 // If this type is defined in a different package, then finalize the
3031 // types of all the methods, since we won't see them otherwise.
3032 if (nt
->named_object()->package() != NULL
&& nt
->has_any_methods())
3034 const Methods
* methods
= nt
->methods();
3035 for (Methods::const_iterator p
= methods
->begin();
3036 p
!= methods
->end();
3039 if (Type::traverse(p
->second
->type(), this) == TRAVERSE_EXIT
)
3040 return TRAVERSE_EXIT
;
3044 // Finalize the types of all methods that are declared but not
3045 // defined, since we won't see the declarations otherwise.
3046 if (nt
->named_object()->package() == NULL
3047 && nt
->local_methods() != NULL
)
3049 const Bindings
* methods
= nt
->local_methods();
3050 for (Bindings::const_declarations_iterator p
=
3051 methods
->begin_declarations();
3052 p
!= methods
->end_declarations();
3055 if (p
->second
->is_function_declaration())
3057 Type
* mt
= p
->second
->func_declaration_value()->type();
3058 if (Type::traverse(mt
, this) == TRAVERSE_EXIT
)
3059 return TRAVERSE_EXIT
;
3064 return TRAVERSE_SKIP_COMPONENTS
;
3067 case Type::TYPE_STRUCT
:
3068 // Traverse the field types first in case there is an embedded
3069 // field with methods that the struct should inherit.
3070 if (t
->struct_type()->traverse_field_types(this) == TRAVERSE_EXIT
)
3071 return TRAVERSE_EXIT
;
3072 t
->struct_type()->finalize_methods(this->gogo_
);
3073 return TRAVERSE_SKIP_COMPONENTS
;
3079 return TRAVERSE_CONTINUE
;
3082 // Finalize method lists and build stub methods for types.
3085 Gogo::finalize_methods()
3087 Finalize_methods
finalize(this);
3088 this->traverse(&finalize
);
3091 // Set types for unspecified variables and constants.
3094 Gogo::determine_types()
3096 Bindings
* bindings
= this->current_bindings();
3097 for (Bindings::const_definitions_iterator p
= bindings
->begin_definitions();
3098 p
!= bindings
->end_definitions();
3101 if ((*p
)->is_function())
3102 (*p
)->func_value()->determine_types();
3103 else if ((*p
)->is_variable())
3104 (*p
)->var_value()->determine_type();
3105 else if ((*p
)->is_const())
3106 (*p
)->const_value()->determine_type();
3108 // See if a variable requires us to build an initialization
3109 // function. We know that we will see all global variables
3111 if (!this->need_init_fn_
&& (*p
)->is_variable())
3113 Variable
* variable
= (*p
)->var_value();
3115 // If this is a global variable which requires runtime
3116 // initialization, we need an initialization function.
3117 if (!variable
->is_global())
3119 else if (variable
->init() == NULL
)
3121 else if (variable
->type()->interface_type() != NULL
)
3122 this->need_init_fn_
= true;
3123 else if (variable
->init()->is_constant())
3125 else if (!variable
->init()->is_composite_literal())
3126 this->need_init_fn_
= true;
3127 else if (variable
->init()->is_nonconstant_composite_literal())
3128 this->need_init_fn_
= true;
3130 // If this is a global variable which holds a pointer value,
3131 // then we need an initialization function to register it as a
3133 if (variable
->is_global() && variable
->type()->has_pointer())
3134 this->need_init_fn_
= true;
3138 // Determine the types of constants in packages.
3139 for (Packages::const_iterator p
= this->packages_
.begin();
3140 p
!= this->packages_
.end();
3142 p
->second
->determine_types();
3145 // Traversal class used for type checking.
3147 class Check_types_traverse
: public Traverse
3150 Check_types_traverse(Gogo
* gogo
)
3151 : Traverse(traverse_variables
3152 | traverse_constants
3153 | traverse_functions
3154 | traverse_statements
3155 | traverse_expressions
),
3160 variable(Named_object
*);
3163 constant(Named_object
*, bool);
3166 function(Named_object
*);
3169 statement(Block
*, size_t* pindex
, Statement
*);
3172 expression(Expression
**);
3179 // Check that a variable initializer has the right type.
3182 Check_types_traverse::variable(Named_object
* named_object
)
3184 if (named_object
->is_variable())
3186 Variable
* var
= named_object
->var_value();
3188 // Give error if variable type is not defined.
3189 var
->type()->base();
3191 Expression
* init
= var
->init();
3194 && !Type::are_assignable(var
->type(), init
->type(), &reason
))
3197 go_error_at(var
->location(), "incompatible type in initialization");
3199 go_error_at(var
->location(),
3200 "incompatible type in initialization (%s)",
3202 init
= Expression::make_error(named_object
->location());
3205 else if (init
!= NULL
3206 && init
->func_expression() != NULL
)
3208 Named_object
* no
= init
->func_expression()->named_object();
3209 Function_type
* fntype
;
3210 if (no
->is_function())
3211 fntype
= no
->func_value()->type();
3212 else if (no
->is_function_declaration())
3213 fntype
= no
->func_declaration_value()->type();
3217 // Builtin functions cannot be used as function values for variable
3219 if (fntype
->is_builtin())
3221 go_error_at(init
->location(),
3222 "invalid use of special builtin function %qs; "
3224 no
->message_name().c_str());
3228 && !var
->is_global()
3229 && !var
->is_parameter()
3230 && !var
->is_receiver()
3231 && !var
->type()->is_error()
3232 && (init
== NULL
|| !init
->is_error_expression())
3233 && !Lex::is_invalid_identifier(named_object
->name()))
3234 go_error_at(var
->location(), "%qs declared and not used",
3235 named_object
->message_name().c_str());
3237 return TRAVERSE_CONTINUE
;
3240 // Check that a constant initializer has the right type.
3243 Check_types_traverse::constant(Named_object
* named_object
, bool)
3245 Named_constant
* constant
= named_object
->const_value();
3246 Type
* ctype
= constant
->type();
3247 if (ctype
->integer_type() == NULL
3248 && ctype
->float_type() == NULL
3249 && ctype
->complex_type() == NULL
3250 && !ctype
->is_boolean_type()
3251 && !ctype
->is_string_type())
3253 if (ctype
->is_nil_type())
3254 go_error_at(constant
->location(), "const initializer cannot be nil");
3255 else if (!ctype
->is_error())
3256 go_error_at(constant
->location(), "invalid constant type");
3257 constant
->set_error();
3259 else if (!constant
->expr()->is_constant())
3261 go_error_at(constant
->expr()->location(), "expression is not constant");
3262 constant
->set_error();
3264 else if (!Type::are_assignable(constant
->type(), constant
->expr()->type(),
3267 go_error_at(constant
->location(),
3268 "initialization expression has wrong type");
3269 constant
->set_error();
3271 return TRAVERSE_CONTINUE
;
3274 // There are no types to check in a function, but this is where we
3275 // issue warnings about labels which are defined but not referenced.
3278 Check_types_traverse::function(Named_object
* no
)
3280 no
->func_value()->check_labels();
3281 return TRAVERSE_CONTINUE
;
3284 // Check that types are valid in a statement.
3287 Check_types_traverse::statement(Block
*, size_t*, Statement
* s
)
3289 s
->check_types(this->gogo_
);
3290 return TRAVERSE_CONTINUE
;
3293 // Check that types are valid in an expression.
3296 Check_types_traverse::expression(Expression
** expr
)
3298 (*expr
)->check_types(this->gogo_
);
3299 return TRAVERSE_CONTINUE
;
3302 // Check that types are valid.
3307 Check_types_traverse
traverse(this);
3308 this->traverse(&traverse
);
3310 Bindings
* bindings
= this->current_bindings();
3311 for (Bindings::const_declarations_iterator p
= bindings
->begin_declarations();
3312 p
!= bindings
->end_declarations();
3315 // Also check the types in a function declaration's signature.
3316 Named_object
* no
= p
->second
;
3317 if (no
->is_function_declaration())
3318 no
->func_declaration_value()->check_types();
3322 // Check the types in a single block.
3325 Gogo::check_types_in_block(Block
* block
)
3327 Check_types_traverse
traverse(this);
3328 block
->traverse(&traverse
);
3331 // A traversal class used to find a single shortcut operator within an
3334 class Find_shortcut
: public Traverse
3338 : Traverse(traverse_blocks
3339 | traverse_statements
3340 | traverse_expressions
),
3344 // A pointer to the expression which was found, or NULL if none was
3348 { return this->found_
; }
3353 { return TRAVERSE_SKIP_COMPONENTS
; }
3356 statement(Block
*, size_t*, Statement
*)
3357 { return TRAVERSE_SKIP_COMPONENTS
; }
3360 expression(Expression
**);
3363 Expression
** found_
;
3366 // Find a shortcut expression.
3369 Find_shortcut::expression(Expression
** pexpr
)
3371 Expression
* expr
= *pexpr
;
3372 Binary_expression
* be
= expr
->binary_expression();
3374 return TRAVERSE_CONTINUE
;
3375 Operator op
= be
->op();
3376 if (op
!= OPERATOR_OROR
&& op
!= OPERATOR_ANDAND
)
3377 return TRAVERSE_CONTINUE
;
3378 go_assert(this->found_
== NULL
);
3379 this->found_
= pexpr
;
3380 return TRAVERSE_EXIT
;
3383 // A traversal class used to turn shortcut operators into explicit if
3386 class Shortcuts
: public Traverse
3389 Shortcuts(Gogo
* gogo
)
3390 : Traverse(traverse_variables
3391 | traverse_statements
),
3397 variable(Named_object
*);
3400 statement(Block
*, size_t*, Statement
*);
3403 // Convert a shortcut operator.
3405 convert_shortcut(Block
* enclosing
, Expression
** pshortcut
);
3411 // Remove shortcut operators in a single statement.
3414 Shortcuts::statement(Block
* block
, size_t* pindex
, Statement
* s
)
3416 // FIXME: This approach doesn't work for switch statements, because
3417 // we add the new statements before the whole switch when we need to
3418 // instead add them just before the switch expression. The right
3419 // fix is probably to lower switch statements with nonconstant cases
3420 // to a series of conditionals.
3421 if (s
->switch_statement() != NULL
)
3422 return TRAVERSE_CONTINUE
;
3426 Find_shortcut find_shortcut
;
3428 // If S is a variable declaration, then ordinary traversal won't
3429 // do anything. We want to explicitly traverse the
3430 // initialization expression if there is one.
3431 Variable_declaration_statement
* vds
= s
->variable_declaration_statement();
3432 Expression
* init
= NULL
;
3434 s
->traverse_contents(&find_shortcut
);
3437 init
= vds
->var()->var_value()->init();
3439 return TRAVERSE_CONTINUE
;
3440 init
->traverse(&init
, &find_shortcut
);
3442 Expression
** pshortcut
= find_shortcut
.found();
3443 if (pshortcut
== NULL
)
3444 return TRAVERSE_CONTINUE
;
3446 Statement
* snew
= this->convert_shortcut(block
, pshortcut
);
3447 block
->insert_statement_before(*pindex
, snew
);
3450 if (pshortcut
== &init
)
3451 vds
->var()->var_value()->set_init(init
);
3455 // Remove shortcut operators in the initializer of a global variable.
3458 Shortcuts::variable(Named_object
* no
)
3460 if (no
->is_result_variable())
3461 return TRAVERSE_CONTINUE
;
3462 Variable
* var
= no
->var_value();
3463 Expression
* init
= var
->init();
3464 if (!var
->is_global() || init
== NULL
)
3465 return TRAVERSE_CONTINUE
;
3469 Find_shortcut find_shortcut
;
3470 init
->traverse(&init
, &find_shortcut
);
3471 Expression
** pshortcut
= find_shortcut
.found();
3472 if (pshortcut
== NULL
)
3473 return TRAVERSE_CONTINUE
;
3475 Statement
* snew
= this->convert_shortcut(NULL
, pshortcut
);
3476 var
->add_preinit_statement(this->gogo_
, snew
);
3477 if (pshortcut
== &init
)
3478 var
->set_init(init
);
3482 // Given an expression which uses a shortcut operator, return a
3483 // statement which implements it, and update *PSHORTCUT accordingly.
3486 Shortcuts::convert_shortcut(Block
* enclosing
, Expression
** pshortcut
)
3488 Binary_expression
* shortcut
= (*pshortcut
)->binary_expression();
3489 Expression
* left
= shortcut
->left();
3490 Expression
* right
= shortcut
->right();
3491 Location loc
= shortcut
->location();
3493 Block
* retblock
= new Block(enclosing
, loc
);
3494 retblock
->set_end_location(loc
);
3496 Temporary_statement
* ts
= Statement::make_temporary(shortcut
->type(),
3498 retblock
->add_statement(ts
);
3500 Block
* block
= new Block(retblock
, loc
);
3501 block
->set_end_location(loc
);
3502 Expression
* tmpref
= Expression::make_temporary_reference(ts
, loc
);
3503 Statement
* assign
= Statement::make_assignment(tmpref
, right
, loc
);
3504 block
->add_statement(assign
);
3506 Expression
* cond
= Expression::make_temporary_reference(ts
, loc
);
3507 if (shortcut
->binary_expression()->op() == OPERATOR_OROR
)
3508 cond
= Expression::make_unary(OPERATOR_NOT
, cond
, loc
);
3510 Statement
* if_statement
= Statement::make_if_statement(cond
, block
, NULL
,
3512 retblock
->add_statement(if_statement
);
3514 *pshortcut
= Expression::make_temporary_reference(ts
, loc
);
3518 // Now convert any shortcut operators in LEFT and RIGHT.
3519 Shortcuts
shortcuts(this->gogo_
);
3520 retblock
->traverse(&shortcuts
);
3522 return Statement::make_block_statement(retblock
, loc
);
3525 // Turn shortcut operators into explicit if statements. Doing this
3526 // considerably simplifies the order of evaluation rules.
3529 Gogo::remove_shortcuts()
3531 Shortcuts
shortcuts(this);
3532 this->traverse(&shortcuts
);
3535 // A traversal class which finds all the expressions which must be
3536 // evaluated in order within a statement or larger expression. This
3537 // is used to implement the rules about order of evaluation.
3539 class Find_eval_ordering
: public Traverse
3542 typedef std::vector
<Expression
**> Expression_pointers
;
3545 Find_eval_ordering()
3546 : Traverse(traverse_blocks
3547 | traverse_statements
3548 | traverse_expressions
),
3554 { return this->exprs_
.size(); }
3556 typedef Expression_pointers::const_iterator const_iterator
;
3560 { return this->exprs_
.begin(); }
3564 { return this->exprs_
.end(); }
3569 { return TRAVERSE_SKIP_COMPONENTS
; }
3572 statement(Block
*, size_t*, Statement
*)
3573 { return TRAVERSE_SKIP_COMPONENTS
; }
3576 expression(Expression
**);
3579 // A list of pointers to expressions with side-effects.
3580 Expression_pointers exprs_
;
3583 // If an expression must be evaluated in order, put it on the list.
3586 Find_eval_ordering::expression(Expression
** expression_pointer
)
3588 // We have to look at subexpressions before this one.
3589 if ((*expression_pointer
)->traverse_subexpressions(this) == TRAVERSE_EXIT
)
3590 return TRAVERSE_EXIT
;
3591 if ((*expression_pointer
)->must_eval_in_order())
3592 this->exprs_
.push_back(expression_pointer
);
3593 return TRAVERSE_SKIP_COMPONENTS
;
3596 // A traversal class for ordering evaluations.
3598 class Order_eval
: public Traverse
3601 Order_eval(Gogo
* gogo
)
3602 : Traverse(traverse_variables
3603 | traverse_statements
),
3608 variable(Named_object
*);
3611 statement(Block
*, size_t*, Statement
*);
3618 // Implement the order of evaluation rules for a statement.
3621 Order_eval::statement(Block
* block
, size_t* pindex
, Statement
* stmt
)
3623 // FIXME: This approach doesn't work for switch statements, because
3624 // we add the new statements before the whole switch when we need to
3625 // instead add them just before the switch expression. The right
3626 // fix is probably to lower switch statements with nonconstant cases
3627 // to a series of conditionals.
3628 if (stmt
->switch_statement() != NULL
)
3629 return TRAVERSE_CONTINUE
;
3631 Find_eval_ordering find_eval_ordering
;
3633 // If S is a variable declaration, then ordinary traversal won't do
3634 // anything. We want to explicitly traverse the initialization
3635 // expression if there is one.
3636 Variable_declaration_statement
* vds
= stmt
->variable_declaration_statement();
3637 Expression
* init
= NULL
;
3638 Expression
* orig_init
= NULL
;
3640 stmt
->traverse_contents(&find_eval_ordering
);
3643 init
= vds
->var()->var_value()->init();
3645 return TRAVERSE_CONTINUE
;
3648 // It might seem that this could be
3649 // init->traverse_subexpressions. Unfortunately that can fail
3652 // newvar, err := call(arg())
3653 // Here newvar will have an init of call result 0 of
3654 // call(arg()). If we only traverse subexpressions, we will
3655 // only find arg(), and we won't bother to move anything out.
3656 // Then we get to the assignment to err, we will traverse the
3657 // whole statement, and this time we will find both call() and
3658 // arg(), and so we will move them out. This will cause them to
3659 // be put into temporary variables before the assignment to err
3660 // but after the declaration of newvar. To avoid that problem,
3661 // we traverse the entire expression here.
3662 Expression::traverse(&init
, &find_eval_ordering
);
3665 size_t c
= find_eval_ordering
.size();
3667 return TRAVERSE_CONTINUE
;
3669 // If there is only one expression with a side-effect, we can
3670 // usually leave it in place.
3673 switch (stmt
->classification())
3675 case Statement::STATEMENT_ASSIGNMENT
:
3676 // For an assignment statement, we need to evaluate an
3677 // expression on the right hand side before we evaluate any
3678 // index expression on the left hand side, so for that case
3679 // we always move the expression. Otherwise we mishandle
3680 // m[0] = len(m) where m is a map.
3683 case Statement::STATEMENT_EXPRESSION
:
3685 // If this is a call statement that doesn't return any
3686 // values, it will not have been counted as a value to
3687 // move. We need to move any subexpressions in case they
3688 // are themselves call statements that require passing a
3690 Expression
* expr
= stmt
->expression_statement()->expr();
3691 if (expr
->call_expression() != NULL
3692 && expr
->call_expression()->result_count() == 0)
3694 return TRAVERSE_CONTINUE
;
3698 // We can leave the expression in place.
3699 return TRAVERSE_CONTINUE
;
3703 bool is_thunk
= stmt
->thunk_statement() != NULL
;
3704 Expression_statement
* es
= stmt
->expression_statement();
3705 for (Find_eval_ordering::const_iterator p
= find_eval_ordering
.begin();
3706 p
!= find_eval_ordering
.end();
3709 Expression
** pexpr
= *p
;
3711 // The last expression in a thunk will be the call passed to go
3712 // or defer, which we must not evaluate early.
3713 if (is_thunk
&& p
+ 1 == find_eval_ordering
.end())
3716 Location loc
= (*pexpr
)->location();
3718 if ((*pexpr
)->call_expression() == NULL
3719 || (*pexpr
)->call_expression()->result_count() < 2)
3721 Temporary_statement
* ts
= Statement::make_temporary(NULL
, *pexpr
,
3724 *pexpr
= Expression::make_temporary_reference(ts
, loc
);
3728 // A call expression which returns multiple results needs to
3729 // be handled specially. We can't create a temporary
3730 // because there is no type to give it. Any actual uses of
3731 // the values will be done via Call_result_expressions.
3733 // Since a given call expression can be shared by multiple
3734 // Call_result_expressions, avoid hoisting the call the
3735 // second time we see it here. In addition, don't try to
3736 // hoist the top-level multi-return call in the statement,
3737 // since doing this would result a tree with more than one copy
3739 if (this->remember_expression(*pexpr
))
3741 else if (es
!= NULL
&& *pexpr
== es
->expr())
3744 s
= Statement::make_statement(*pexpr
, true);
3749 block
->insert_statement_before(*pindex
, s
);
3754 if (init
!= orig_init
)
3755 vds
->var()->var_value()->set_init(init
);
3757 return TRAVERSE_CONTINUE
;
3760 // Implement the order of evaluation rules for the initializer of a
3764 Order_eval::variable(Named_object
* no
)
3766 if (no
->is_result_variable())
3767 return TRAVERSE_CONTINUE
;
3768 Variable
* var
= no
->var_value();
3769 Expression
* init
= var
->init();
3770 if (!var
->is_global() || init
== NULL
)
3771 return TRAVERSE_CONTINUE
;
3773 Find_eval_ordering find_eval_ordering
;
3774 Expression::traverse(&init
, &find_eval_ordering
);
3776 if (find_eval_ordering
.size() <= 1)
3778 // If there is only one expression with a side-effect, we can
3779 // leave it in place.
3780 return TRAVERSE_SKIP_COMPONENTS
;
3783 Expression
* orig_init
= init
;
3785 for (Find_eval_ordering::const_iterator p
= find_eval_ordering
.begin();
3786 p
!= find_eval_ordering
.end();
3789 Expression
** pexpr
= *p
;
3790 Location loc
= (*pexpr
)->location();
3792 if ((*pexpr
)->call_expression() == NULL
3793 || (*pexpr
)->call_expression()->result_count() < 2)
3795 Temporary_statement
* ts
= Statement::make_temporary(NULL
, *pexpr
,
3798 *pexpr
= Expression::make_temporary_reference(ts
, loc
);
3802 // A call expression which returns multiple results needs to
3803 // be handled specially.
3804 s
= Statement::make_statement(*pexpr
, true);
3806 var
->add_preinit_statement(this->gogo_
, s
);
3809 if (init
!= orig_init
)
3810 var
->set_init(init
);
3812 return TRAVERSE_SKIP_COMPONENTS
;
3815 // Use temporary variables to implement the order of evaluation rules.
3818 Gogo::order_evaluations()
3820 Order_eval
order_eval(this);
3821 this->traverse(&order_eval
);
3824 // Traversal to flatten parse tree after order of evaluation rules are applied.
3826 class Flatten
: public Traverse
3829 Flatten(Gogo
* gogo
, Named_object
* function
)
3830 : Traverse(traverse_variables
3831 | traverse_functions
3832 | traverse_statements
3833 | traverse_expressions
),
3834 gogo_(gogo
), function_(function
), inserter_()
3838 set_inserter(const Statement_inserter
* inserter
)
3839 { this->inserter_
= *inserter
; }
3842 variable(Named_object
*);
3845 function(Named_object
*);
3848 statement(Block
*, size_t* pindex
, Statement
*);
3851 expression(Expression
**);
3856 // The function we are traversing.
3857 Named_object
* function_
;
3858 // Current statement inserter for use by expressions.
3859 Statement_inserter inserter_
;
3862 // Flatten variables.
3865 Flatten::variable(Named_object
* no
)
3867 if (!no
->is_variable())
3868 return TRAVERSE_CONTINUE
;
3870 if (no
->is_variable() && no
->var_value()->is_global())
3872 // Global variables can have loops in their initialization
3873 // expressions. This is handled in flatten_init_expression.
3874 no
->var_value()->flatten_init_expression(this->gogo_
, this->function_
,
3876 return TRAVERSE_CONTINUE
;
3879 if (!no
->var_value()->is_parameter()
3880 && !no
->var_value()->is_receiver()
3881 && !no
->var_value()->is_closure()
3882 && no
->var_value()->is_non_escaping_address_taken()
3883 && !no
->var_value()->is_in_heap()
3884 && no
->var_value()->toplevel_decl() == NULL
)
3886 // Local variable that has address taken but not escape.
3887 // It needs to be live beyond its lexical scope. So we
3888 // create a top-level declaration for it.
3889 // No need to do it if it is already in the top level.
3890 Block
* top_block
= function_
->func_value()->block();
3891 if (top_block
->bindings()->lookup_local(no
->name()) != no
)
3893 Variable
* var
= no
->var_value();
3894 Temporary_statement
* ts
=
3895 Statement::make_temporary(var
->type(), NULL
, var
->location());
3896 ts
->set_is_address_taken();
3897 top_block
->add_statement_at_front(ts
);
3898 var
->set_toplevel_decl(ts
);
3902 go_assert(!no
->var_value()->has_pre_init());
3904 return TRAVERSE_SKIP_COMPONENTS
;
3907 // Flatten the body of a function. Record the function while flattening it,
3908 // so that we can pass it down when flattening an expression.
3911 Flatten::function(Named_object
* no
)
3913 go_assert(this->function_
== NULL
);
3914 this->function_
= no
;
3915 int t
= no
->func_value()->traverse(this);
3916 this->function_
= NULL
;
3918 if (t
== TRAVERSE_EXIT
)
3920 return TRAVERSE_SKIP_COMPONENTS
;
3923 // Flatten statement parse trees.
3926 Flatten::statement(Block
* block
, size_t* pindex
, Statement
* sorig
)
3928 // Because we explicitly traverse the statement's contents
3929 // ourselves, we want to skip block statements here. There is
3930 // nothing to flatten in a block statement.
3931 if (sorig
->is_block_statement())
3932 return TRAVERSE_CONTINUE
;
3934 Statement_inserter
hold_inserter(this->inserter_
);
3935 this->inserter_
= Statement_inserter(block
, pindex
);
3937 // Flatten the expressions first.
3938 int t
= sorig
->traverse_contents(this);
3939 if (t
== TRAVERSE_EXIT
)
3941 this->inserter_
= hold_inserter
;
3945 // Keep flattening until nothing changes.
3946 Statement
* s
= sorig
;
3949 Statement
* snew
= s
->flatten(this->gogo_
, this->function_
, block
,
3954 t
= s
->traverse_contents(this);
3955 if (t
== TRAVERSE_EXIT
)
3957 this->inserter_
= hold_inserter
;
3963 block
->replace_statement(*pindex
, s
);
3965 this->inserter_
= hold_inserter
;
3966 return TRAVERSE_SKIP_COMPONENTS
;
3969 // Flatten expression parse trees.
3972 Flatten::expression(Expression
** pexpr
)
3974 // Keep flattening until nothing changes.
3977 Expression
* e
= *pexpr
;
3978 if (e
->traverse_subexpressions(this) == TRAVERSE_EXIT
)
3979 return TRAVERSE_EXIT
;
3981 Expression
* enew
= e
->flatten(this->gogo_
, this->function_
,
3987 return TRAVERSE_SKIP_COMPONENTS
;
3993 Gogo::flatten_block(Named_object
* function
, Block
* block
)
3995 Flatten
flatten(this, function
);
3996 block
->traverse(&flatten
);
3999 // Flatten an expression. INSERTER may be NULL, in which case the
4000 // expression had better not need to create any temporaries.
4003 Gogo::flatten_expression(Named_object
* function
, Statement_inserter
* inserter
,
4006 Flatten
flatten(this, function
);
4007 if (inserter
!= NULL
)
4008 flatten
.set_inserter(inserter
);
4009 flatten
.expression(pexpr
);
4015 Flatten
flatten(this, NULL
);
4016 this->traverse(&flatten
);
4019 // Traversal to convert calls to the predeclared recover function to
4020 // pass in an argument indicating whether it can recover from a panic
4023 class Convert_recover
: public Traverse
4026 Convert_recover(Named_object
* arg
)
4027 : Traverse(traverse_expressions
),
4033 expression(Expression
**);
4036 // The argument to pass to the function.
4040 // Convert calls to recover.
4043 Convert_recover::expression(Expression
** pp
)
4045 Call_expression
* ce
= (*pp
)->call_expression();
4046 if (ce
!= NULL
&& ce
->is_recover_call())
4047 ce
->set_recover_arg(Expression::make_var_reference(this->arg_
,
4049 return TRAVERSE_CONTINUE
;
4052 // Traversal for build_recover_thunks.
4054 class Build_recover_thunks
: public Traverse
4057 Build_recover_thunks(Gogo
* gogo
)
4058 : Traverse(traverse_functions
),
4063 function(Named_object
*);
4067 can_recover_arg(Location
);
4073 // If this function calls recover, turn it into a thunk.
4076 Build_recover_thunks::function(Named_object
* orig_no
)
4078 Function
* orig_func
= orig_no
->func_value();
4079 if (!orig_func
->calls_recover()
4080 || orig_func
->is_recover_thunk()
4081 || orig_func
->has_recover_thunk())
4082 return TRAVERSE_CONTINUE
;
4084 Gogo
* gogo
= this->gogo_
;
4085 Location location
= orig_func
->location();
4090 Function_type
* orig_fntype
= orig_func
->type();
4091 Typed_identifier_list
* new_params
= new Typed_identifier_list();
4092 std::string receiver_name
;
4093 if (orig_fntype
->is_method())
4095 const Typed_identifier
* receiver
= orig_fntype
->receiver();
4096 snprintf(buf
, sizeof buf
, "rt.%u", count
);
4098 receiver_name
= buf
;
4099 new_params
->push_back(Typed_identifier(receiver_name
, receiver
->type(),
4100 receiver
->location()));
4102 const Typed_identifier_list
* orig_params
= orig_fntype
->parameters();
4103 if (orig_params
!= NULL
&& !orig_params
->empty())
4105 for (Typed_identifier_list::const_iterator p
= orig_params
->begin();
4106 p
!= orig_params
->end();
4109 snprintf(buf
, sizeof buf
, "pt.%u", count
);
4111 new_params
->push_back(Typed_identifier(buf
, p
->type(),
4115 snprintf(buf
, sizeof buf
, "pr.%u", count
);
4117 std::string can_recover_name
= buf
;
4118 new_params
->push_back(Typed_identifier(can_recover_name
,
4119 Type::lookup_bool_type(),
4120 orig_fntype
->location()));
4122 const Typed_identifier_list
* orig_results
= orig_fntype
->results();
4123 Typed_identifier_list
* new_results
;
4124 if (orig_results
== NULL
|| orig_results
->empty())
4128 new_results
= new Typed_identifier_list();
4129 for (Typed_identifier_list::const_iterator p
= orig_results
->begin();
4130 p
!= orig_results
->end();
4132 new_results
->push_back(Typed_identifier("", p
->type(), p
->location()));
4135 Function_type
*new_fntype
= Type::make_function_type(NULL
, new_params
,
4137 orig_fntype
->location());
4138 if (orig_fntype
->is_varargs())
4139 new_fntype
->set_is_varargs();
4142 if (orig_fntype
->is_method())
4143 rtype
= orig_fntype
->receiver()->type();
4144 std::string
name(gogo
->recover_thunk_name(orig_no
->name(), rtype
));
4145 Named_object
*new_no
= gogo
->start_function(name
, new_fntype
, false,
4147 Function
*new_func
= new_no
->func_value();
4148 if (orig_func
->enclosing() != NULL
)
4149 new_func
->set_enclosing(orig_func
->enclosing());
4151 // We build the code for the original function attached to the new
4152 // function, and then swap the original and new function bodies.
4153 // This means that existing references to the original function will
4154 // then refer to the new function. That makes this code a little
4155 // confusing, in that the reference to NEW_NO really refers to the
4156 // other function, not the one we are building.
4158 Expression
* closure
= NULL
;
4159 if (orig_func
->needs_closure())
4161 // For the new function we are creating, declare a new parameter
4162 // variable NEW_CLOSURE_NO and set it to be the closure variable
4163 // of the function. This will be set to the closure value
4164 // passed in by the caller. Then pass a reference to this
4165 // variable as the closure value when calling the original
4166 // function. In other words, simply pass the closure value
4167 // through the thunk we are creating.
4168 Named_object
* orig_closure_no
= orig_func
->closure_var();
4169 Variable
* orig_closure_var
= orig_closure_no
->var_value();
4170 Variable
* new_var
= new Variable(orig_closure_var
->type(), NULL
, false,
4171 false, false, location
);
4172 new_var
->set_is_closure();
4173 snprintf(buf
, sizeof buf
, "closure.%u", count
);
4175 Named_object
* new_closure_no
= Named_object::make_variable(buf
, NULL
,
4177 new_func
->set_closure_var(new_closure_no
);
4178 closure
= Expression::make_var_reference(new_closure_no
, location
);
4181 Expression
* fn
= Expression::make_func_reference(new_no
, closure
, location
);
4183 Expression_list
* args
= new Expression_list();
4184 if (new_params
!= NULL
)
4186 // Note that we skip the last parameter, which is the boolean
4187 // indicating whether recover can succed.
4188 for (Typed_identifier_list::const_iterator p
= new_params
->begin();
4189 p
+ 1 != new_params
->end();
4192 Named_object
* p_no
= gogo
->lookup(p
->name(), NULL
);
4193 go_assert(p_no
!= NULL
4194 && p_no
->is_variable()
4195 && p_no
->var_value()->is_parameter());
4196 args
->push_back(Expression::make_var_reference(p_no
, location
));
4199 args
->push_back(this->can_recover_arg(location
));
4201 gogo
->start_block(location
);
4203 Call_expression
* call
= Expression::make_call(fn
, args
, false, location
);
4205 // Any varargs call has already been lowered.
4206 call
->set_varargs_are_lowered();
4208 Statement
* s
= Statement::make_return_from_call(call
, location
);
4209 s
->determine_types();
4210 gogo
->add_statement(s
);
4212 Block
* b
= gogo
->finish_block(location
);
4214 gogo
->add_block(b
, location
);
4216 // Lower the call in case it returns multiple results.
4217 gogo
->lower_block(new_no
, b
);
4219 gogo
->finish_function(location
);
4221 // Swap the function bodies and types.
4222 new_func
->swap_for_recover(orig_func
);
4223 orig_func
->set_is_recover_thunk();
4224 new_func
->set_calls_recover();
4225 new_func
->set_has_recover_thunk();
4227 Bindings
* orig_bindings
= orig_func
->block()->bindings();
4228 Bindings
* new_bindings
= new_func
->block()->bindings();
4229 if (orig_fntype
->is_method())
4231 // We changed the receiver to be a regular parameter. We have
4232 // to update the binding accordingly in both functions.
4233 Named_object
* orig_rec_no
= orig_bindings
->lookup_local(receiver_name
);
4234 go_assert(orig_rec_no
!= NULL
4235 && orig_rec_no
->is_variable()
4236 && !orig_rec_no
->var_value()->is_receiver());
4237 orig_rec_no
->var_value()->set_is_receiver();
4239 std::string
new_receiver_name(orig_fntype
->receiver()->name());
4240 if (new_receiver_name
.empty())
4242 // Find the receiver. It was named "r.NNN" in
4243 // Gogo::start_function.
4244 for (Bindings::const_definitions_iterator p
=
4245 new_bindings
->begin_definitions();
4246 p
!= new_bindings
->end_definitions();
4249 const std::string
& pname((*p
)->name());
4250 if (pname
[0] == 'r' && pname
[1] == '.')
4252 new_receiver_name
= pname
;
4256 go_assert(!new_receiver_name
.empty());
4258 Named_object
* new_rec_no
= new_bindings
->lookup_local(new_receiver_name
);
4259 if (new_rec_no
== NULL
)
4260 go_assert(saw_errors());
4263 go_assert(new_rec_no
->is_variable()
4264 && new_rec_no
->var_value()->is_receiver());
4265 new_rec_no
->var_value()->set_is_not_receiver();
4269 // Because we flipped blocks but not types, the can_recover
4270 // parameter appears in the (now) old bindings as a parameter.
4271 // Change it to a local variable, whereupon it will be discarded.
4272 Named_object
* can_recover_no
= orig_bindings
->lookup_local(can_recover_name
);
4273 go_assert(can_recover_no
!= NULL
4274 && can_recover_no
->is_variable()
4275 && can_recover_no
->var_value()->is_parameter());
4276 orig_bindings
->remove_binding(can_recover_no
);
4278 // Add the can_recover argument to the (now) new bindings, and
4279 // attach it to any recover statements.
4280 Variable
* can_recover_var
= new Variable(Type::lookup_bool_type(), NULL
,
4281 false, true, false, location
);
4282 can_recover_no
= new_bindings
->add_variable(can_recover_name
, NULL
,
4284 Convert_recover
convert_recover(can_recover_no
);
4285 new_func
->traverse(&convert_recover
);
4287 // Update the function pointers in any named results.
4288 new_func
->update_result_variables();
4289 orig_func
->update_result_variables();
4291 return TRAVERSE_CONTINUE
;
4294 // Return the expression to pass for the .can_recover parameter to the
4295 // new function. This indicates whether a call to recover may return
4296 // non-nil. The expression is runtime.canrecover(__builtin_return_address()).
4299 Build_recover_thunks::can_recover_arg(Location location
)
4301 static Named_object
* builtin_return_address
;
4302 if (builtin_return_address
== NULL
)
4303 builtin_return_address
=
4304 Gogo::declare_builtin_rf_address("__builtin_return_address");
4306 static Named_object
* can_recover
;
4307 if (can_recover
== NULL
)
4309 const Location bloc
= Linemap::predeclared_location();
4310 Typed_identifier_list
* param_types
= new Typed_identifier_list();
4311 Type
* voidptr_type
= Type::make_pointer_type(Type::make_void_type());
4312 param_types
->push_back(Typed_identifier("a", voidptr_type
, bloc
));
4313 Type
* boolean_type
= Type::lookup_bool_type();
4314 Typed_identifier_list
* results
= new Typed_identifier_list();
4315 results
->push_back(Typed_identifier("", boolean_type
, bloc
));
4316 Function_type
* fntype
= Type::make_function_type(NULL
, param_types
,
4319 Named_object::make_function_declaration("runtime_canrecover",
4320 NULL
, fntype
, bloc
);
4321 can_recover
->func_declaration_value()->set_asm_name("runtime.canrecover");
4324 Expression
* fn
= Expression::make_func_reference(builtin_return_address
,
4327 Expression
* zexpr
= Expression::make_integer_ul(0, NULL
, location
);
4328 Expression_list
*args
= new Expression_list();
4329 args
->push_back(zexpr
);
4331 Expression
* call
= Expression::make_call(fn
, args
, false, location
);
4333 args
= new Expression_list();
4334 args
->push_back(call
);
4336 fn
= Expression::make_func_reference(can_recover
, NULL
, location
);
4337 return Expression::make_call(fn
, args
, false, location
);
4340 // Build thunks for functions which call recover. We build a new
4341 // function with an extra parameter, which is whether a call to
4342 // recover can succeed. We then move the body of this function to
4343 // that one. We then turn this function into a thunk which calls the
4344 // new one, passing the value of runtime.canrecover(__builtin_return_address()).
4345 // The function will be marked as not splitting the stack. This will
4346 // cooperate with the implementation of defer to make recover do the
4350 Gogo::build_recover_thunks()
4352 Build_recover_thunks
build_recover_thunks(this);
4353 this->traverse(&build_recover_thunks
);
4356 // Return a declaration for __builtin_return_address or
4357 // __builtin_frame_address.
4360 Gogo::declare_builtin_rf_address(const char* name
)
4362 const Location bloc
= Linemap::predeclared_location();
4364 Typed_identifier_list
* param_types
= new Typed_identifier_list();
4365 Type
* uint32_type
= Type::lookup_integer_type("uint32");
4366 param_types
->push_back(Typed_identifier("l", uint32_type
, bloc
));
4368 Typed_identifier_list
* return_types
= new Typed_identifier_list();
4369 Type
* voidptr_type
= Type::make_pointer_type(Type::make_void_type());
4370 return_types
->push_back(Typed_identifier("", voidptr_type
, bloc
));
4372 Function_type
* fntype
= Type::make_function_type(NULL
, param_types
,
4373 return_types
, bloc
);
4374 Named_object
* ret
= Named_object::make_function_declaration(name
, NULL
,
4376 ret
->func_declaration_value()->set_asm_name(name
);
4380 // Build a call to the runtime error function.
4383 Gogo::runtime_error(int code
, Location location
)
4385 Type
* int32_type
= Type::lookup_integer_type("int32");
4386 Expression
* code_expr
= Expression::make_integer_ul(code
, int32_type
,
4388 return Runtime::make_call(Runtime::RUNTIME_ERROR
, location
, 1, code_expr
);
4391 // Look for named types to see whether we need to create an interface
4394 class Build_method_tables
: public Traverse
4397 Build_method_tables(Gogo
* gogo
,
4398 const std::vector
<Interface_type
*>& interfaces
)
4399 : Traverse(traverse_types
),
4400 gogo_(gogo
), interfaces_(interfaces
)
4409 // A list of locally defined interfaces which have hidden methods.
4410 const std::vector
<Interface_type
*>& interfaces_
;
4413 // Build all required interface method tables for types. We need to
4414 // ensure that we have an interface method table for every interface
4415 // which has a hidden method, for every named type which implements
4416 // that interface. Normally we can just build interface method tables
4417 // as we need them. However, in some cases we can require an
4418 // interface method table for an interface defined in a different
4419 // package for a type defined in that package. If that interface and
4420 // type both use a hidden method, that is OK. However, we will not be
4421 // able to build that interface method table when we need it, because
4422 // the type's hidden method will be static. So we have to build it
4423 // here, and just refer it from other packages as needed.
4426 Gogo::build_interface_method_tables()
4431 std::vector
<Interface_type
*> hidden_interfaces
;
4432 hidden_interfaces
.reserve(this->interface_types_
.size());
4433 for (std::vector
<Interface_type
*>::const_iterator pi
=
4434 this->interface_types_
.begin();
4435 pi
!= this->interface_types_
.end();
4438 const Typed_identifier_list
* methods
= (*pi
)->methods();
4439 if (methods
== NULL
)
4441 for (Typed_identifier_list::const_iterator pm
= methods
->begin();
4442 pm
!= methods
->end();
4445 if (Gogo::is_hidden_name(pm
->name()))
4447 hidden_interfaces
.push_back(*pi
);
4453 if (!hidden_interfaces
.empty())
4455 // Now traverse the tree looking for all named types.
4456 Build_method_tables
bmt(this, hidden_interfaces
);
4457 this->traverse(&bmt
);
4460 // We no longer need the list of interfaces.
4462 this->interface_types_
.clear();
4465 // This is called for each type. For a named type, for each of the
4466 // interfaces with hidden methods that it implements, create the
4470 Build_method_tables::type(Type
* type
)
4472 Named_type
* nt
= type
->named_type();
4473 Struct_type
* st
= type
->struct_type();
4474 if (nt
!= NULL
|| st
!= NULL
)
4476 Translate_context
context(this->gogo_
, NULL
, NULL
, NULL
);
4477 for (std::vector
<Interface_type
*>::const_iterator p
=
4478 this->interfaces_
.begin();
4479 p
!= this->interfaces_
.end();
4482 // We ask whether a pointer to the named type implements the
4483 // interface, because a pointer can implement more methods
4487 if ((*p
)->implements_interface(Type::make_pointer_type(nt
),
4490 nt
->interface_method_table(*p
, false)->get_backend(&context
);
4491 nt
->interface_method_table(*p
, true)->get_backend(&context
);
4496 if ((*p
)->implements_interface(Type::make_pointer_type(st
),
4499 st
->interface_method_table(*p
, false)->get_backend(&context
);
4500 st
->interface_method_table(*p
, true)->get_backend(&context
);
4505 return TRAVERSE_CONTINUE
;
4508 // Return an expression which allocates memory to hold values of type TYPE.
4511 Gogo::allocate_memory(Type
* type
, Location location
)
4513 Expression
* td
= Expression::make_type_descriptor(type
, location
);
4514 return Runtime::make_call(Runtime::NEW
, location
, 1, td
);
4517 // Traversal class used to check for return statements.
4519 class Check_return_statements_traverse
: public Traverse
4522 Check_return_statements_traverse()
4523 : Traverse(traverse_functions
)
4527 function(Named_object
*);
4530 // Check that a function has a return statement if it needs one.
4533 Check_return_statements_traverse::function(Named_object
* no
)
4535 Function
* func
= no
->func_value();
4536 const Function_type
* fntype
= func
->type();
4537 const Typed_identifier_list
* results
= fntype
->results();
4539 // We only need a return statement if there is a return value.
4540 if (results
== NULL
|| results
->empty())
4541 return TRAVERSE_CONTINUE
;
4543 if (func
->block()->may_fall_through())
4544 go_error_at(func
->block()->end_location(),
4545 "missing return at end of function");
4547 return TRAVERSE_CONTINUE
;
4550 // Check return statements.
4553 Gogo::check_return_statements()
4555 Check_return_statements_traverse traverse
;
4556 this->traverse(&traverse
);
4559 // Export identifiers as requested.
4564 // For now we always stream to a section. Later we may want to
4565 // support streaming to a separate file.
4566 Stream_to_section
stream(this->backend());
4568 // Write out either the prefix or pkgpath depending on how we were
4571 std::string pkgpath
;
4572 if (this->pkgpath_from_option_
)
4573 pkgpath
= this->pkgpath_
;
4574 else if (this->prefix_from_option_
)
4575 prefix
= this->prefix_
;
4576 else if (this->is_main_package())
4581 Export
exp(&stream
);
4582 exp
.register_builtin_types(this);
4583 exp
.export_globals(this->package_name(),
4588 (this->need_init_fn_
&& !this->is_main_package()
4589 ? this->get_init_fn_name()
4591 this->imported_init_fns_
,
4592 this->package_
->bindings());
4594 if (!this->c_header_
.empty() && !saw_errors())
4595 this->write_c_header();
4598 // Write the top level named struct types in C format to a C header
4599 // file. This is used when building the runtime package, to share
4600 // struct definitions between C and Go.
4603 Gogo::write_c_header()
4606 out
.open(this->c_header_
.c_str());
4609 go_error_at(Linemap::unknown_location(),
4610 "cannot open %s: %m", this->c_header_
.c_str());
4614 std::list
<Named_object
*> types
;
4615 Bindings
* top
= this->package_
->bindings();
4616 for (Bindings::const_definitions_iterator p
= top
->begin_definitions();
4617 p
!= top
->end_definitions();
4620 Named_object
* no
= *p
;
4622 // Skip names that start with underscore followed by something
4623 // other than an uppercase letter, as when compiling the runtime
4624 // package they are mostly types defined by mkrsysinfo.sh based
4625 // on the C system header files. We don't need to translate
4626 // types to C and back to Go. But do accept the special cases
4627 // _defer and _panic.
4628 std::string name
= Gogo::unpack_hidden_name(no
->name());
4630 && (name
[1] < 'A' || name
[1] > 'Z')
4631 && (name
!= "_defer" && name
!= "_panic"))
4634 if (no
->is_type() && no
->type_value()->struct_type() != NULL
)
4635 types
.push_back(no
);
4636 if (no
->is_const() && no
->const_value()->type()->integer_type() != NULL
)
4638 Numeric_constant nc
;
4640 if (no
->const_value()->expr()->numeric_constant_value(&nc
)
4641 && nc
.to_unsigned_long(&val
) == Numeric_constant::NC_UL_VALID
)
4643 out
<< "#define " << no
->message_name() << ' ' << val
4649 std::vector
<const Named_object
*> written
;
4651 while (!types
.empty())
4653 Named_object
* no
= types
.front();
4656 std::vector
<const Named_object
*> requires
;
4657 std::vector
<const Named_object
*> declare
;
4658 if (!no
->type_value()->struct_type()->can_write_to_c_header(&requires
,
4663 for (std::vector
<const Named_object
*>::const_iterator pr
4665 pr
!= requires
.end() && ok
;
4668 for (std::list
<Named_object
*>::const_iterator pt
= types
.begin();
4669 pt
!= types
.end() && ok
;
4679 // This should be impossible since the code parsed and
4684 types
.push_back(no
);
4688 for (std::vector
<const Named_object
*>::const_iterator pd
4690 pd
!= declare
.end();
4696 std::vector
<const Named_object
*> drequires
;
4697 std::vector
<const Named_object
*> ddeclare
;
4698 if (!(*pd
)->type_value()->struct_type()->
4699 can_write_to_c_header(&drequires
, &ddeclare
))
4703 for (std::vector
<const Named_object
*>::const_iterator pw
4705 pw
!= written
.end();
4717 out
<< "struct " << (*pd
)->message_name() << ";" << std::endl
;
4718 written
.push_back(*pd
);
4723 out
<< "struct " << no
->message_name() << " {" << std::endl
;
4724 no
->type_value()->struct_type()->write_to_c_header(out
);
4725 out
<< "};" << std::endl
;
4726 written
.push_back(no
);
4731 go_error_at(Linemap::unknown_location(),
4732 "error writing to %s: %m", this->c_header_
.c_str());
4735 // Find the blocks in order to convert named types defined in blocks.
4737 class Convert_named_types
: public Traverse
4740 Convert_named_types(Gogo
* gogo
)
4741 : Traverse(traverse_blocks
),
4747 block(Block
* block
);
4754 Convert_named_types::block(Block
* block
)
4756 this->gogo_
->convert_named_types_in_bindings(block
->bindings());
4757 return TRAVERSE_CONTINUE
;
4760 // Convert all named types to the backend representation. Since named
4761 // types can refer to other types, this needs to be done in the right
4762 // sequence, which is handled by Named_type::convert. Here we arrange
4763 // to call that for each named type.
4766 Gogo::convert_named_types()
4768 this->convert_named_types_in_bindings(this->globals_
);
4769 for (Packages::iterator p
= this->packages_
.begin();
4770 p
!= this->packages_
.end();
4773 Package
* package
= p
->second
;
4774 this->convert_named_types_in_bindings(package
->bindings());
4777 Convert_named_types
cnt(this);
4778 this->traverse(&cnt
);
4780 // Make all the builtin named types used for type descriptors, and
4781 // then convert them. They will only be written out if they are
4783 Type::make_type_descriptor_type();
4784 Type::make_type_descriptor_ptr_type();
4785 Function_type::make_function_type_descriptor_type();
4786 Pointer_type::make_pointer_type_descriptor_type();
4787 Struct_type::make_struct_type_descriptor_type();
4788 Array_type::make_array_type_descriptor_type();
4789 Array_type::make_slice_type_descriptor_type();
4790 Map_type::make_map_type_descriptor_type();
4791 Channel_type::make_chan_type_descriptor_type();
4792 Interface_type::make_interface_type_descriptor_type();
4793 Expression::make_func_descriptor_type();
4794 Type::convert_builtin_named_types(this);
4796 Runtime::convert_types(this);
4798 this->named_types_are_converted_
= true;
4800 Type::finish_pointer_types(this);
4803 // Convert all names types in a set of bindings.
4806 Gogo::convert_named_types_in_bindings(Bindings
* bindings
)
4808 for (Bindings::const_definitions_iterator p
= bindings
->begin_definitions();
4809 p
!= bindings
->end_definitions();
4812 if ((*p
)->is_type())
4813 (*p
)->type_value()->convert(this);
4819 Function::Function(Function_type
* type
, Named_object
* enclosing
, Block
* block
,
4821 : type_(type
), enclosing_(enclosing
), results_(NULL
),
4822 closure_var_(NULL
), block_(block
), location_(location
), labels_(),
4823 local_type_count_(0), descriptor_(NULL
), fndecl_(NULL
), defer_stack_(NULL
),
4824 pragmas_(0), is_sink_(false), results_are_named_(false),
4825 is_unnamed_type_stub_method_(false), calls_recover_(false),
4826 is_recover_thunk_(false), has_recover_thunk_(false),
4827 calls_defer_retaddr_(false), is_type_specific_function_(false),
4828 in_unique_section_(false)
4832 // Create the named result variables.
4835 Function::create_result_variables(Gogo
* gogo
)
4837 const Typed_identifier_list
* results
= this->type_
->results();
4838 if (results
== NULL
|| results
->empty())
4841 if (!results
->front().name().empty())
4842 this->results_are_named_
= true;
4844 this->results_
= new Results();
4845 this->results_
->reserve(results
->size());
4847 Block
* block
= this->block_
;
4849 for (Typed_identifier_list::const_iterator p
= results
->begin();
4850 p
!= results
->end();
4853 std::string name
= p
->name();
4854 if (name
.empty() || Gogo::is_sink_name(name
))
4856 static int result_counter
;
4858 snprintf(buf
, sizeof buf
, "$ret%d", result_counter
);
4860 name
= gogo
->pack_hidden_name(buf
, false);
4862 Result_variable
* result
= new Result_variable(p
->type(), this, index
,
4864 Named_object
* no
= block
->bindings()->add_result_variable(name
, result
);
4865 if (no
->is_result_variable())
4866 this->results_
->push_back(no
);
4869 static int dummy_result_count
;
4871 snprintf(buf
, sizeof buf
, "$dret%d", dummy_result_count
);
4872 ++dummy_result_count
;
4873 name
= gogo
->pack_hidden_name(buf
, false);
4874 no
= block
->bindings()->add_result_variable(name
, result
);
4875 go_assert(no
->is_result_variable());
4876 this->results_
->push_back(no
);
4881 // Update the named result variables when cloning a function which
4885 Function::update_result_variables()
4887 if (this->results_
== NULL
)
4890 for (Results::iterator p
= this->results_
->begin();
4891 p
!= this->results_
->end();
4893 (*p
)->result_var_value()->set_function(this);
4896 // Whether this method should not be included in the type descriptor.
4899 Function::nointerface() const
4901 go_assert(this->is_method());
4902 return (this->pragmas_
& GOPRAGMA_NOINTERFACE
) != 0;
4905 // Record that this method should not be included in the type
4909 Function::set_nointerface()
4911 this->pragmas_
|= GOPRAGMA_NOINTERFACE
;
4914 // Return the closure variable, creating it if necessary.
4917 Function::closure_var()
4919 if (this->closure_var_
== NULL
)
4921 go_assert(this->descriptor_
== NULL
);
4922 // We don't know the type of the variable yet. We add fields as
4924 Location loc
= this->type_
->location();
4925 Struct_field_list
* sfl
= new Struct_field_list
;
4926 Struct_type
* struct_type
= Type::make_struct_type(sfl
, loc
);
4927 struct_type
->set_is_struct_incomparable();
4928 Variable
* var
= new Variable(Type::make_pointer_type(struct_type
),
4929 NULL
, false, false, false, loc
);
4931 var
->set_is_closure();
4932 this->closure_var_
= Named_object::make_variable("$closure", NULL
, var
);
4933 // Note that the new variable is not in any binding contour.
4935 return this->closure_var_
;
4938 // Set the type of the closure variable.
4941 Function::set_closure_type()
4943 if (this->closure_var_
== NULL
)
4945 Named_object
* closure
= this->closure_var_
;
4946 Struct_type
* st
= closure
->var_value()->type()->deref()->struct_type();
4948 // The first field of a closure is always a pointer to the function
4950 Type
* voidptr_type
= Type::make_pointer_type(Type::make_void_type());
4951 st
->push_field(Struct_field(Typed_identifier(".$f", voidptr_type
,
4954 unsigned int index
= 1;
4955 for (Closure_fields::const_iterator p
= this->closure_fields_
.begin();
4956 p
!= this->closure_fields_
.end();
4959 Named_object
* no
= p
->first
;
4961 snprintf(buf
, sizeof buf
, "%u", index
);
4962 std::string n
= no
->name() + buf
;
4964 if (no
->is_variable())
4965 var_type
= no
->var_value()->type();
4967 var_type
= no
->result_var_value()->type();
4968 Type
* field_type
= Type::make_pointer_type(var_type
);
4969 st
->push_field(Struct_field(Typed_identifier(n
, field_type
, p
->second
)));
4973 // Return whether this function is a method.
4976 Function::is_method() const
4978 return this->type_
->is_method();
4981 // Add a label definition.
4984 Function::add_label_definition(Gogo
* gogo
, const std::string
& label_name
,
4987 Label
* lnull
= NULL
;
4988 std::pair
<Labels::iterator
, bool> ins
=
4989 this->labels_
.insert(std::make_pair(label_name
, lnull
));
4991 if (label_name
== "_")
4993 label
= Label::create_dummy_label();
4995 ins
.first
->second
= label
;
4997 else if (ins
.second
)
4999 // This is a new label.
5000 label
= new Label(label_name
);
5001 ins
.first
->second
= label
;
5005 // The label was already in the hash table.
5006 label
= ins
.first
->second
;
5007 if (label
->is_defined())
5009 go_error_at(location
, "label %qs already defined",
5010 Gogo::message_name(label_name
).c_str());
5011 go_inform(label
->location(), "previous definition of %qs was here",
5012 Gogo::message_name(label_name
).c_str());
5013 return new Label(label_name
);
5017 label
->define(location
, gogo
->bindings_snapshot(location
));
5019 // Issue any errors appropriate for any previous goto's to this
5021 const std::vector
<Bindings_snapshot
*>& refs(label
->refs());
5022 for (std::vector
<Bindings_snapshot
*>::const_iterator p
= refs
.begin();
5025 (*p
)->check_goto_to(gogo
->current_block());
5026 label
->clear_refs();
5031 // Add a reference to a label.
5034 Function::add_label_reference(Gogo
* gogo
, const std::string
& label_name
,
5035 Location location
, bool issue_goto_errors
)
5037 Label
* lnull
= NULL
;
5038 std::pair
<Labels::iterator
, bool> ins
=
5039 this->labels_
.insert(std::make_pair(label_name
, lnull
));
5043 // The label was already in the hash table.
5044 label
= ins
.first
->second
;
5048 go_assert(ins
.first
->second
== NULL
);
5049 label
= new Label(label_name
);
5050 ins
.first
->second
= label
;
5053 label
->set_is_used();
5055 if (issue_goto_errors
)
5057 Bindings_snapshot
* snapshot
= label
->snapshot();
5058 if (snapshot
!= NULL
)
5059 snapshot
->check_goto_from(gogo
->current_block(), location
);
5061 label
->add_snapshot_ref(gogo
->bindings_snapshot(location
));
5067 // Warn about labels that are defined but not used.
5070 Function::check_labels() const
5072 for (Labels::const_iterator p
= this->labels_
.begin();
5073 p
!= this->labels_
.end();
5076 Label
* label
= p
->second
;
5077 if (!label
->is_used())
5078 go_error_at(label
->location(), "label %qs defined and not used",
5079 Gogo::message_name(label
->name()).c_str());
5083 // Swap one function with another. This is used when building the
5084 // thunk we use to call a function which calls recover. It may not
5085 // work for any other case.
5088 Function::swap_for_recover(Function
*x
)
5090 go_assert(this->enclosing_
== x
->enclosing_
);
5091 std::swap(this->results_
, x
->results_
);
5092 std::swap(this->closure_var_
, x
->closure_var_
);
5093 std::swap(this->block_
, x
->block_
);
5094 go_assert(this->location_
== x
->location_
);
5095 go_assert(this->fndecl_
== NULL
&& x
->fndecl_
== NULL
);
5096 go_assert(this->defer_stack_
== NULL
&& x
->defer_stack_
== NULL
);
5099 // Traverse the tree.
5102 Function::traverse(Traverse
* traverse
)
5104 unsigned int traverse_mask
= traverse
->traverse_mask();
5107 & (Traverse::traverse_types
| Traverse::traverse_expressions
))
5110 if (Type::traverse(this->type_
, traverse
) == TRAVERSE_EXIT
)
5111 return TRAVERSE_EXIT
;
5114 // FIXME: We should check traverse_functions here if nested
5115 // functions are stored in block bindings.
5116 if (this->block_
!= NULL
5118 & (Traverse::traverse_variables
5119 | Traverse::traverse_constants
5120 | Traverse::traverse_blocks
5121 | Traverse::traverse_statements
5122 | Traverse::traverse_expressions
5123 | Traverse::traverse_types
)) != 0)
5125 if (this->block_
->traverse(traverse
) == TRAVERSE_EXIT
)
5126 return TRAVERSE_EXIT
;
5129 return TRAVERSE_CONTINUE
;
5132 // Work out types for unspecified variables and constants.
5135 Function::determine_types()
5137 if (this->block_
!= NULL
)
5138 this->block_
->determine_types();
5141 // Return the function descriptor, the value you get when you refer to
5142 // the function in Go code without calling it.
5145 Function::descriptor(Gogo
*, Named_object
* no
)
5147 go_assert(!this->is_method());
5148 go_assert(this->closure_var_
== NULL
);
5149 if (this->descriptor_
== NULL
)
5150 this->descriptor_
= Expression::make_func_descriptor(no
);
5151 return this->descriptor_
;
5154 // Get a pointer to the variable representing the defer stack for this
5155 // function, making it if necessary. The value of the variable is set
5156 // by the runtime routines to true if the function is returning,
5157 // rather than panicing through. A pointer to this variable is used
5158 // as a marker for the functions on the defer stack associated with
5159 // this function. A function-specific variable permits inlining a
5160 // function which uses defer.
5163 Function::defer_stack(Location location
)
5165 if (this->defer_stack_
== NULL
)
5167 Type
* t
= Type::lookup_bool_type();
5168 Expression
* n
= Expression::make_boolean(false, location
);
5169 this->defer_stack_
= Statement::make_temporary(t
, n
, location
);
5170 this->defer_stack_
->set_is_address_taken();
5172 Expression
* ref
= Expression::make_temporary_reference(this->defer_stack_
,
5174 return Expression::make_unary(OPERATOR_AND
, ref
, location
);
5177 // Export the function.
5180 Function::export_func(Export
* exp
, const std::string
& name
) const
5182 Function::export_func_with_type(exp
, name
, this->type_
);
5185 // Export a function with a type.
5188 Function::export_func_with_type(Export
* exp
, const std::string
& name
,
5189 const Function_type
* fntype
)
5191 exp
->write_c_string("func ");
5193 if (fntype
->is_method())
5195 exp
->write_c_string("(");
5196 const Typed_identifier
* receiver
= fntype
->receiver();
5197 exp
->write_name(receiver
->name());
5198 exp
->write_escape(receiver
->note());
5199 exp
->write_c_string(" ");
5200 exp
->write_type(receiver
->type());
5201 exp
->write_c_string(") ");
5204 exp
->write_string(name
);
5206 exp
->write_c_string(" (");
5207 const Typed_identifier_list
* parameters
= fntype
->parameters();
5208 if (parameters
!= NULL
)
5211 bool is_varargs
= fntype
->is_varargs();
5213 for (Typed_identifier_list::const_iterator p
= parameters
->begin();
5214 p
!= parameters
->end();
5220 exp
->write_c_string(", ");
5221 exp
->write_name(p
->name());
5222 exp
->write_escape(p
->note());
5223 exp
->write_c_string(" ");
5224 if (!is_varargs
|| p
+ 1 != parameters
->end())
5225 exp
->write_type(p
->type());
5228 exp
->write_c_string("...");
5229 exp
->write_type(p
->type()->array_type()->element_type());
5233 exp
->write_c_string(")");
5235 const Typed_identifier_list
* results
= fntype
->results();
5236 if (results
!= NULL
)
5238 if (results
->size() == 1 && results
->begin()->name().empty())
5240 exp
->write_c_string(" ");
5241 exp
->write_type(results
->begin()->type());
5245 exp
->write_c_string(" (");
5247 for (Typed_identifier_list::const_iterator p
= results
->begin();
5248 p
!= results
->end();
5254 exp
->write_c_string(", ");
5255 exp
->write_name(p
->name());
5256 exp
->write_escape(p
->note());
5257 exp
->write_c_string(" ");
5258 exp
->write_type(p
->type());
5260 exp
->write_c_string(")");
5263 exp
->write_c_string(";\n");
5266 // Import a function.
5269 Function::import_func(Import
* imp
, std::string
* pname
,
5270 Typed_identifier
** preceiver
,
5271 Typed_identifier_list
** pparameters
,
5272 Typed_identifier_list
** presults
,
5275 imp
->require_c_string("func ");
5278 if (imp
->peek_char() == '(')
5280 imp
->require_c_string("(");
5281 std::string name
= imp
->read_name();
5282 std::string escape_note
= imp
->read_escape();
5283 imp
->require_c_string(" ");
5284 Type
* rtype
= imp
->read_type();
5285 *preceiver
= new Typed_identifier(name
, rtype
, imp
->location());
5286 (*preceiver
)->set_note(escape_note
);
5287 imp
->require_c_string(") ");
5290 *pname
= imp
->read_identifier();
5292 Typed_identifier_list
* parameters
;
5293 *is_varargs
= false;
5294 imp
->require_c_string(" (");
5295 if (imp
->peek_char() == ')')
5299 parameters
= new Typed_identifier_list();
5302 std::string name
= imp
->read_name();
5303 std::string escape_note
= imp
->read_escape();
5304 imp
->require_c_string(" ");
5306 if (imp
->match_c_string("..."))
5312 Type
* ptype
= imp
->read_type();
5314 ptype
= Type::make_array_type(ptype
, NULL
);
5315 Typed_identifier t
= Typed_identifier(name
, ptype
, imp
->location());
5316 t
.set_note(escape_note
);
5317 parameters
->push_back(t
);
5318 if (imp
->peek_char() != ',')
5320 go_assert(!*is_varargs
);
5321 imp
->require_c_string(", ");
5324 imp
->require_c_string(")");
5325 *pparameters
= parameters
;
5327 Typed_identifier_list
* results
;
5328 if (imp
->peek_char() != ' ')
5332 results
= new Typed_identifier_list();
5333 imp
->require_c_string(" ");
5334 if (imp
->peek_char() != '(')
5336 Type
* rtype
= imp
->read_type();
5337 results
->push_back(Typed_identifier("", rtype
, imp
->location()));
5341 imp
->require_c_string("(");
5344 std::string name
= imp
->read_name();
5345 std::string note
= imp
->read_escape();
5346 imp
->require_c_string(" ");
5347 Type
* rtype
= imp
->read_type();
5348 Typed_identifier t
= Typed_identifier(name
, rtype
,
5351 results
->push_back(t
);
5352 if (imp
->peek_char() != ',')
5354 imp
->require_c_string(", ");
5356 imp
->require_c_string(")");
5359 imp
->require_c_string(";\n");
5360 *presults
= results
;
5363 // Get the backend representation.
5366 Function::get_or_make_decl(Gogo
* gogo
, Named_object
* no
)
5368 if (this->fndecl_
== NULL
)
5370 bool is_visible
= false;
5371 bool is_init_fn
= false;
5373 if (no
->package() != NULL
)
5375 else if (this->enclosing_
!= NULL
|| Gogo::is_thunk(no
))
5377 else if (Gogo::unpack_hidden_name(no
->name()) == "init"
5378 && !this->type_
->is_method())
5380 else if (no
->name() == gogo
->get_init_fn_name())
5385 else if (Gogo::unpack_hidden_name(no
->name()) == "main"
5386 && gogo
->is_main_package())
5388 // Methods have to be public even if they are hidden because
5389 // they can be pulled into type descriptors when using
5390 // anonymous fields.
5391 else if (!Gogo::is_hidden_name(no
->name())
5392 || this->type_
->is_method())
5394 if (!this->is_unnamed_type_stub_method_
)
5396 if (this->type_
->is_method())
5397 rtype
= this->type_
->receiver()->type();
5400 std::string asm_name
;
5401 if (!this->asm_name_
.empty())
5403 asm_name
= this->asm_name_
;
5405 // If an assembler name is explicitly specified, there must
5406 // be some reason to refer to the symbol from a different
5410 else if (is_init_fn
)
5412 // These names appear in the export data and are used
5413 // directly in the assembler code. If we change this here
5414 // we need to change Gogo::init_imports.
5415 asm_name
= no
->name();
5418 asm_name
= gogo
->function_asm_name(no
->name(), NULL
, rtype
);
5420 // If a function calls the predeclared recover function, we
5421 // can't inline it, because recover behaves differently in a
5422 // function passed directly to defer. If this is a recover
5423 // thunk that we built to test whether a function can be
5424 // recovered, we can't inline it, because that will mess up
5425 // our return address comparison.
5426 bool is_inlinable
= !(this->calls_recover_
|| this->is_recover_thunk_
);
5428 // If a function calls __go_set_defer_retaddr, then mark it as
5429 // uninlinable. This prevents the GCC backend from splitting
5430 // the function; splitting the function is a bad idea because we
5431 // want the return address label to be in the same function as
5433 if (this->calls_defer_retaddr_
)
5434 is_inlinable
= false;
5436 // Check the //go:noinline compiler directive.
5437 if ((this->pragmas_
& GOPRAGMA_NOINLINE
) != 0)
5438 is_inlinable
= false;
5440 // If this is a thunk created to call a function which calls
5441 // the predeclared recover function, we need to disable
5442 // stack splitting for the thunk.
5443 bool disable_split_stack
= this->is_recover_thunk_
;
5445 // Check the //go:nosplit compiler directive.
5446 if ((this->pragmas_
& GOPRAGMA_NOSPLIT
) != 0)
5447 disable_split_stack
= true;
5449 // This should go into a unique section if that has been
5450 // requested elsewhere, or if this is a nointerface function.
5451 // We want to put a nointerface function into a unique section
5452 // because there is a good chance that the linker garbage
5453 // collection can discard it.
5454 bool in_unique_section
= (this->in_unique_section_
5455 || (this->is_method() && this->nointerface()));
5457 Btype
* functype
= this->type_
->get_backend_fntype(gogo
);
5459 gogo
->backend()->function(functype
, no
->get_id(gogo
), asm_name
,
5460 is_visible
, false, is_inlinable
,
5461 disable_split_stack
, false,
5462 in_unique_section
, this->location());
5464 return this->fndecl_
;
5467 // Get the backend representation.
5470 Function_declaration::get_or_make_decl(Gogo
* gogo
, Named_object
* no
)
5472 if (this->fndecl_
== NULL
)
5474 bool does_not_return
= false;
5476 // Let Go code use an asm declaration to pick up a builtin
5478 if (!this->asm_name_
.empty())
5480 Bfunction
* builtin_decl
=
5481 gogo
->backend()->lookup_builtin(this->asm_name_
);
5482 if (builtin_decl
!= NULL
)
5484 this->fndecl_
= builtin_decl
;
5485 return this->fndecl_
;
5488 if (this->asm_name_
== "runtime.gopanic"
5489 || this->asm_name_
== "__go_runtime_error")
5490 does_not_return
= true;
5493 std::string asm_name
;
5494 if (this->asm_name_
.empty())
5497 if (this->fntype_
->is_method())
5498 rtype
= this->fntype_
->receiver()->type();
5499 asm_name
= gogo
->function_asm_name(no
->name(), no
->package(), rtype
);
5501 else if (go_id_needs_encoding(no
->get_id(gogo
)))
5502 asm_name
= go_encode_id(no
->get_id(gogo
));
5504 Btype
* functype
= this->fntype_
->get_backend_fntype(gogo
);
5506 gogo
->backend()->function(functype
, no
->get_id(gogo
), asm_name
,
5507 true, true, true, false, does_not_return
,
5508 false, this->location());
5511 return this->fndecl_
;
5514 // Build the descriptor for a function declaration. This won't
5515 // necessarily happen if the package has just a declaration for the
5516 // function and no other reference to it, but we may still need the
5517 // descriptor for references from other packages.
5519 Function_declaration::build_backend_descriptor(Gogo
* gogo
)
5521 if (this->descriptor_
!= NULL
)
5523 Translate_context
context(gogo
, NULL
, NULL
, NULL
);
5524 this->descriptor_
->get_backend(&context
);
5528 // Check that the types used in this declaration's signature are defined.
5529 // Reports errors for any undefined type.
5532 Function_declaration::check_types() const
5534 // Calling Type::base will give errors for any undefined types.
5535 Function_type
* fntype
= this->type();
5536 if (fntype
->receiver() != NULL
)
5537 fntype
->receiver()->type()->base();
5538 if (fntype
->parameters() != NULL
)
5540 const Typed_identifier_list
* params
= fntype
->parameters();
5541 for (Typed_identifier_list::const_iterator p
= params
->begin();
5548 // Return the function's decl after it has been built.
5551 Function::get_decl() const
5553 go_assert(this->fndecl_
!= NULL
);
5554 return this->fndecl_
;
5557 // Build the backend representation for the function code.
5560 Function::build(Gogo
* gogo
, Named_object
* named_function
)
5562 Translate_context
context(gogo
, named_function
, NULL
, NULL
);
5564 // A list of parameter variables for this function.
5565 std::vector
<Bvariable
*> param_vars
;
5567 // Variables that need to be declared for this function and their
5569 std::vector
<Bvariable
*> vars
;
5570 std::vector
<Bexpression
*> var_inits
;
5571 for (Bindings::const_definitions_iterator p
=
5572 this->block_
->bindings()->begin_definitions();
5573 p
!= this->block_
->bindings()->end_definitions();
5576 Location loc
= (*p
)->location();
5577 if ((*p
)->is_variable() && (*p
)->var_value()->is_parameter())
5579 Bvariable
* bvar
= (*p
)->get_backend_variable(gogo
, named_function
);
5580 Bvariable
* parm_bvar
= bvar
;
5582 // We always pass the receiver to a method as a pointer. If
5583 // the receiver is declared as a non-pointer type, then we
5584 // copy the value into a local variable.
5585 if ((*p
)->var_value()->is_receiver()
5586 && (*p
)->var_value()->type()->points_to() == NULL
)
5588 std::string name
= (*p
)->name() + ".pointer";
5589 Type
* var_type
= (*p
)->var_value()->type();
5590 Variable
* parm_var
=
5591 new Variable(Type::make_pointer_type(var_type
), NULL
, false,
5593 Named_object
* parm_no
=
5594 Named_object::make_variable(name
, NULL
, parm_var
);
5595 parm_bvar
= parm_no
->get_backend_variable(gogo
, named_function
);
5597 vars
.push_back(bvar
);
5598 Expression
* parm_ref
=
5599 Expression::make_var_reference(parm_no
, loc
);
5601 Expression::make_dereference(parm_ref
,
5602 Expression::NIL_CHECK_DEFAULT
,
5604 if ((*p
)->var_value()->is_in_heap())
5605 parm_ref
= Expression::make_heap_expression(parm_ref
, loc
);
5606 var_inits
.push_back(parm_ref
->get_backend(&context
));
5608 else if ((*p
)->var_value()->is_in_heap())
5610 // If we take the address of a parameter, then we need
5611 // to copy it into the heap.
5612 std::string parm_name
= (*p
)->name() + ".param";
5613 Variable
* parm_var
= new Variable((*p
)->var_value()->type(), NULL
,
5614 false, true, false, loc
);
5615 Named_object
* parm_no
=
5616 Named_object::make_variable(parm_name
, NULL
, parm_var
);
5617 parm_bvar
= parm_no
->get_backend_variable(gogo
, named_function
);
5619 vars
.push_back(bvar
);
5620 Expression
* var_ref
=
5621 Expression::make_var_reference(parm_no
, loc
);
5622 var_ref
= Expression::make_heap_expression(var_ref
, loc
);
5623 var_inits
.push_back(var_ref
->get_backend(&context
));
5625 param_vars
.push_back(parm_bvar
);
5627 else if ((*p
)->is_result_variable())
5629 Bvariable
* bvar
= (*p
)->get_backend_variable(gogo
, named_function
);
5631 Type
* type
= (*p
)->result_var_value()->type();
5633 if (!(*p
)->result_var_value()->is_in_heap())
5635 Btype
* btype
= type
->get_backend(gogo
);
5636 init
= gogo
->backend()->zero_expression(btype
);
5639 init
= Expression::make_allocation(type
,
5640 loc
)->get_backend(&context
);
5642 vars
.push_back(bvar
);
5643 var_inits
.push_back(init
);
5646 if (!gogo
->backend()->function_set_parameters(this->fndecl_
, param_vars
))
5648 go_assert(saw_errors());
5652 // If we need a closure variable, make sure to create it.
5653 // It gets installed in the function as a side effect of creation.
5654 if (this->closure_var_
!= NULL
)
5656 go_assert(this->closure_var_
->var_value()->is_closure());
5657 this->closure_var_
->get_backend_variable(gogo
, named_function
);
5660 if (this->block_
!= NULL
)
5662 // Declare variables if necessary.
5663 Bblock
* var_decls
= NULL
;
5665 Bstatement
* defer_init
= NULL
;
5666 if (!vars
.empty() || this->defer_stack_
!= NULL
)
5669 gogo
->backend()->block(this->fndecl_
, NULL
, vars
,
5670 this->block_
->start_location(),
5671 this->block_
->end_location());
5673 if (this->defer_stack_
!= NULL
)
5675 Translate_context
dcontext(gogo
, named_function
, this->block_
,
5677 defer_init
= this->defer_stack_
->get_backend(&dcontext
);
5681 // Build the backend representation for all the statements in the
5683 Translate_context
context(gogo
, named_function
, NULL
, NULL
);
5684 Bblock
* code_block
= this->block_
->get_backend(&context
);
5686 // Initialize variables if necessary.
5687 std::vector
<Bstatement
*> init
;
5688 go_assert(vars
.size() == var_inits
.size());
5689 for (size_t i
= 0; i
< vars
.size(); ++i
)
5691 Bstatement
* init_stmt
=
5692 gogo
->backend()->init_statement(this->fndecl_
, vars
[i
],
5694 init
.push_back(init_stmt
);
5696 if (defer_init
!= NULL
)
5697 init
.push_back(defer_init
);
5698 Bstatement
* var_init
= gogo
->backend()->statement_list(init
);
5700 // Initialize all variables before executing this code block.
5701 Bstatement
* code_stmt
= gogo
->backend()->block_statement(code_block
);
5702 code_stmt
= gogo
->backend()->compound_statement(var_init
, code_stmt
);
5704 // If we have a defer stack, initialize it at the start of a
5706 Bstatement
* except
= NULL
;
5707 Bstatement
* fini
= NULL
;
5708 if (defer_init
!= NULL
)
5710 // Clean up the defer stack when we leave the function.
5711 this->build_defer_wrapper(gogo
, named_function
, &except
, &fini
);
5713 // Wrap the code for this function in an exception handler to handle
5716 gogo
->backend()->exception_handler_statement(code_stmt
,
5721 // Stick the code into the block we built for the receiver, if
5723 if (var_decls
!= NULL
)
5725 std::vector
<Bstatement
*> code_stmt_list(1, code_stmt
);
5726 gogo
->backend()->block_add_statements(var_decls
, code_stmt_list
);
5727 code_stmt
= gogo
->backend()->block_statement(var_decls
);
5730 if (!gogo
->backend()->function_set_body(this->fndecl_
, code_stmt
))
5732 go_assert(saw_errors());
5737 // If we created a descriptor for the function, make sure we emit it.
5738 if (this->descriptor_
!= NULL
)
5740 Translate_context
context(gogo
, NULL
, NULL
, NULL
);
5741 this->descriptor_
->get_backend(&context
);
5745 // Build the wrappers around function code needed if the function has
5746 // any defer statements. This sets *EXCEPT to an exception handler
5747 // and *FINI to a finally handler.
5750 Function::build_defer_wrapper(Gogo
* gogo
, Named_object
* named_function
,
5751 Bstatement
** except
, Bstatement
** fini
)
5753 Location end_loc
= this->block_
->end_location();
5755 // Add an exception handler. This is used if a panic occurs. Its
5756 // purpose is to stop the stack unwinding if a deferred function
5757 // calls recover. There are more details in
5758 // libgo/runtime/go-unwind.c.
5760 std::vector
<Bstatement
*> stmts
;
5761 Expression
* call
= Runtime::make_call(Runtime::CHECKDEFER
, end_loc
, 1,
5762 this->defer_stack(end_loc
));
5763 Translate_context
context(gogo
, named_function
, NULL
, NULL
);
5764 Bexpression
* defer
= call
->get_backend(&context
);
5765 stmts
.push_back(gogo
->backend()->expression_statement(this->fndecl_
, defer
));
5767 Bstatement
* ret_bstmt
= this->return_value(gogo
, named_function
, end_loc
);
5768 if (ret_bstmt
!= NULL
)
5769 stmts
.push_back(ret_bstmt
);
5771 go_assert(*except
== NULL
);
5772 *except
= gogo
->backend()->statement_list(stmts
);
5774 call
= Runtime::make_call(Runtime::CHECKDEFER
, end_loc
, 1,
5775 this->defer_stack(end_loc
));
5776 defer
= call
->get_backend(&context
);
5778 call
= Runtime::make_call(Runtime::DEFERRETURN
, end_loc
, 1,
5779 this->defer_stack(end_loc
));
5780 Bexpression
* undefer
= call
->get_backend(&context
);
5781 Bstatement
* function_defer
=
5782 gogo
->backend()->function_defer_statement(this->fndecl_
, undefer
, defer
,
5784 stmts
= std::vector
<Bstatement
*>(1, function_defer
);
5785 if (this->type_
->results() != NULL
5786 && !this->type_
->results()->empty()
5787 && !this->type_
->results()->front().name().empty())
5789 // If the result variables are named, and we are returning from
5790 // this function rather than panicing through it, we need to
5791 // return them again, because they might have been changed by a
5792 // defer function. The runtime routines set the defer_stack
5793 // variable to true if we are returning from this function.
5795 ret_bstmt
= this->return_value(gogo
, named_function
, end_loc
);
5796 Bexpression
* nil
= Expression::make_nil(end_loc
)->get_backend(&context
);
5798 gogo
->backend()->compound_expression(ret_bstmt
, nil
, end_loc
);
5800 Expression::make_temporary_reference(this->defer_stack_
, end_loc
);
5801 Bexpression
* bref
= ref
->get_backend(&context
);
5802 ret
= gogo
->backend()->conditional_expression(this->fndecl_
,
5803 NULL
, bref
, ret
, NULL
,
5805 stmts
.push_back(gogo
->backend()->expression_statement(this->fndecl_
, ret
));
5808 go_assert(*fini
== NULL
);
5809 *fini
= gogo
->backend()->statement_list(stmts
);
5812 // Return the statement that assigns values to this function's result struct.
5815 Function::return_value(Gogo
* gogo
, Named_object
* named_function
,
5816 Location location
) const
5818 const Typed_identifier_list
* results
= this->type_
->results();
5819 if (results
== NULL
|| results
->empty())
5822 go_assert(this->results_
!= NULL
);
5823 if (this->results_
->size() != results
->size())
5825 go_assert(saw_errors());
5826 return gogo
->backend()->error_statement();
5829 std::vector
<Bexpression
*> vals(results
->size());
5830 for (size_t i
= 0; i
< vals
.size(); ++i
)
5832 Named_object
* no
= (*this->results_
)[i
];
5833 Bvariable
* bvar
= no
->get_backend_variable(gogo
, named_function
);
5834 Bexpression
* val
= gogo
->backend()->var_expression(bvar
, location
);
5835 if (no
->result_var_value()->is_in_heap())
5837 Btype
* bt
= no
->result_var_value()->type()->get_backend(gogo
);
5838 val
= gogo
->backend()->indirect_expression(bt
, val
, true, location
);
5842 return gogo
->backend()->return_statement(this->fndecl_
, vals
, location
);
5847 Block::Block(Block
* enclosing
, Location location
)
5848 : enclosing_(enclosing
), statements_(),
5849 bindings_(new Bindings(enclosing
== NULL
5851 : enclosing
->bindings())),
5852 start_location_(location
),
5853 end_location_(Linemap::unknown_location())
5857 // Add a statement to a block.
5860 Block::add_statement(Statement
* statement
)
5862 this->statements_
.push_back(statement
);
5865 // Add a statement to the front of a block. This is slow but is only
5866 // used for reference counts of parameters.
5869 Block::add_statement_at_front(Statement
* statement
)
5871 this->statements_
.insert(this->statements_
.begin(), statement
);
5874 // Replace a statement in a block.
5877 Block::replace_statement(size_t index
, Statement
* s
)
5879 go_assert(index
< this->statements_
.size());
5880 this->statements_
[index
] = s
;
5883 // Add a statement before another statement.
5886 Block::insert_statement_before(size_t index
, Statement
* s
)
5888 go_assert(index
< this->statements_
.size());
5889 this->statements_
.insert(this->statements_
.begin() + index
, s
);
5892 // Add a statement after another statement.
5895 Block::insert_statement_after(size_t index
, Statement
* s
)
5897 go_assert(index
< this->statements_
.size());
5898 this->statements_
.insert(this->statements_
.begin() + index
+ 1, s
);
5901 // Traverse the tree.
5904 Block::traverse(Traverse
* traverse
)
5906 unsigned int traverse_mask
= traverse
->traverse_mask();
5908 if ((traverse_mask
& Traverse::traverse_blocks
) != 0)
5910 int t
= traverse
->block(this);
5911 if (t
== TRAVERSE_EXIT
)
5912 return TRAVERSE_EXIT
;
5913 else if (t
== TRAVERSE_SKIP_COMPONENTS
)
5914 return TRAVERSE_CONTINUE
;
5918 & (Traverse::traverse_variables
5919 | Traverse::traverse_constants
5920 | Traverse::traverse_expressions
5921 | Traverse::traverse_types
)) != 0)
5923 const unsigned int e_or_t
= (Traverse::traverse_expressions
5924 | Traverse::traverse_types
);
5925 const unsigned int e_or_t_or_s
= (e_or_t
5926 | Traverse::traverse_statements
);
5927 for (Bindings::const_definitions_iterator pb
=
5928 this->bindings_
->begin_definitions();
5929 pb
!= this->bindings_
->end_definitions();
5932 int t
= TRAVERSE_CONTINUE
;
5933 switch ((*pb
)->classification())
5935 case Named_object::NAMED_OBJECT_CONST
:
5936 if ((traverse_mask
& Traverse::traverse_constants
) != 0)
5937 t
= traverse
->constant(*pb
, false);
5938 if (t
== TRAVERSE_CONTINUE
5939 && (traverse_mask
& e_or_t
) != 0)
5941 Type
* tc
= (*pb
)->const_value()->type();
5943 && Type::traverse(tc
, traverse
) == TRAVERSE_EXIT
)
5944 return TRAVERSE_EXIT
;
5945 t
= (*pb
)->const_value()->traverse_expression(traverse
);
5949 case Named_object::NAMED_OBJECT_VAR
:
5950 case Named_object::NAMED_OBJECT_RESULT_VAR
:
5951 if ((traverse_mask
& Traverse::traverse_variables
) != 0)
5952 t
= traverse
->variable(*pb
);
5953 if (t
== TRAVERSE_CONTINUE
5954 && (traverse_mask
& e_or_t
) != 0)
5956 if ((*pb
)->is_result_variable()
5957 || (*pb
)->var_value()->has_type())
5959 Type
* tv
= ((*pb
)->is_variable()
5960 ? (*pb
)->var_value()->type()
5961 : (*pb
)->result_var_value()->type());
5963 && Type::traverse(tv
, traverse
) == TRAVERSE_EXIT
)
5964 return TRAVERSE_EXIT
;
5967 if (t
== TRAVERSE_CONTINUE
5968 && (traverse_mask
& e_or_t_or_s
) != 0
5969 && (*pb
)->is_variable())
5970 t
= (*pb
)->var_value()->traverse_expression(traverse
,
5974 case Named_object::NAMED_OBJECT_FUNC
:
5975 case Named_object::NAMED_OBJECT_FUNC_DECLARATION
:
5978 case Named_object::NAMED_OBJECT_TYPE
:
5979 if ((traverse_mask
& e_or_t
) != 0)
5980 t
= Type::traverse((*pb
)->type_value(), traverse
);
5983 case Named_object::NAMED_OBJECT_TYPE_DECLARATION
:
5984 case Named_object::NAMED_OBJECT_UNKNOWN
:
5985 case Named_object::NAMED_OBJECT_ERRONEOUS
:
5988 case Named_object::NAMED_OBJECT_PACKAGE
:
5989 case Named_object::NAMED_OBJECT_SINK
:
5996 if (t
== TRAVERSE_EXIT
)
5997 return TRAVERSE_EXIT
;
6001 // No point in checking traverse_mask here--if we got here we always
6002 // want to walk the statements. The traversal can insert new
6003 // statements before or after the current statement. Inserting
6004 // statements before the current statement requires updating I via
6005 // the pointer; those statements will not be traversed. Any new
6006 // statements inserted after the current statement will be traversed
6008 for (size_t i
= 0; i
< this->statements_
.size(); ++i
)
6010 if (this->statements_
[i
]->traverse(this, &i
, traverse
) == TRAVERSE_EXIT
)
6011 return TRAVERSE_EXIT
;
6014 return TRAVERSE_CONTINUE
;
6017 // Work out types for unspecified variables and constants.
6020 Block::determine_types()
6022 for (Bindings::const_definitions_iterator pb
=
6023 this->bindings_
->begin_definitions();
6024 pb
!= this->bindings_
->end_definitions();
6027 if ((*pb
)->is_variable())
6028 (*pb
)->var_value()->determine_type();
6029 else if ((*pb
)->is_const())
6030 (*pb
)->const_value()->determine_type();
6033 for (std::vector
<Statement
*>::const_iterator ps
= this->statements_
.begin();
6034 ps
!= this->statements_
.end();
6036 (*ps
)->determine_types();
6039 // Return true if the statements in this block may fall through.
6042 Block::may_fall_through() const
6044 if (this->statements_
.empty())
6046 return this->statements_
.back()->may_fall_through();
6049 // Convert a block to the backend representation.
6052 Block::get_backend(Translate_context
* context
)
6054 Gogo
* gogo
= context
->gogo();
6055 Named_object
* function
= context
->function();
6056 std::vector
<Bvariable
*> vars
;
6057 vars
.reserve(this->bindings_
->size_definitions());
6058 for (Bindings::const_definitions_iterator pv
=
6059 this->bindings_
->begin_definitions();
6060 pv
!= this->bindings_
->end_definitions();
6063 if ((*pv
)->is_variable() && !(*pv
)->var_value()->is_parameter())
6064 vars
.push_back((*pv
)->get_backend_variable(gogo
, function
));
6067 go_assert(function
!= NULL
);
6068 Bfunction
* bfunction
=
6069 function
->func_value()->get_or_make_decl(gogo
, function
);
6070 Bblock
* ret
= context
->backend()->block(bfunction
, context
->bblock(),
6071 vars
, this->start_location_
,
6072 this->end_location_
);
6074 Translate_context
subcontext(gogo
, function
, this, ret
);
6075 std::vector
<Bstatement
*> bstatements
;
6076 bstatements
.reserve(this->statements_
.size());
6077 for (std::vector
<Statement
*>::const_iterator p
= this->statements_
.begin();
6078 p
!= this->statements_
.end();
6080 bstatements
.push_back((*p
)->get_backend(&subcontext
));
6082 context
->backend()->block_add_statements(ret
, bstatements
);
6087 // Class Bindings_snapshot.
6089 Bindings_snapshot::Bindings_snapshot(const Block
* b
, Location location
)
6090 : block_(b
), counts_(), location_(location
)
6094 this->counts_
.push_back(b
->bindings()->size_definitions());
6099 // Report errors appropriate for a goto from B to this.
6102 Bindings_snapshot::check_goto_from(const Block
* b
, Location loc
)
6105 if (!this->check_goto_block(loc
, b
, this->block_
, &dummy
))
6107 this->check_goto_defs(loc
, this->block_
,
6108 this->block_
->bindings()->size_definitions(),
6112 // Report errors appropriate for a goto from this to B.
6115 Bindings_snapshot::check_goto_to(const Block
* b
)
6118 if (!this->check_goto_block(this->location_
, this->block_
, b
, &index
))
6120 this->check_goto_defs(this->location_
, b
, this->counts_
[index
],
6121 b
->bindings()->size_definitions());
6124 // Report errors appropriate for a goto at LOC from BFROM to BTO.
6125 // Return true if all is well, false if we reported an error. If this
6126 // returns true, it sets *PINDEX to the number of blocks BTO is above
6130 Bindings_snapshot::check_goto_block(Location loc
, const Block
* bfrom
,
6131 const Block
* bto
, size_t* pindex
)
6133 // It is an error if BTO is not either BFROM or above BFROM.
6135 for (const Block
* pb
= bfrom
; pb
!= bto
; pb
= pb
->enclosing(), ++index
)
6139 go_error_at(loc
, "goto jumps into block");
6140 go_inform(bto
->start_location(), "goto target block starts here");
6148 // Report errors appropriate for a goto at LOC ending at BLOCK, where
6149 // CFROM is the number of names defined at the point of the goto and
6150 // CTO is the number of names defined at the point of the label.
6153 Bindings_snapshot::check_goto_defs(Location loc
, const Block
* block
,
6154 size_t cfrom
, size_t cto
)
6158 Bindings::const_definitions_iterator p
=
6159 block
->bindings()->begin_definitions();
6160 for (size_t i
= 0; i
< cfrom
; ++i
)
6162 go_assert(p
!= block
->bindings()->end_definitions());
6165 go_assert(p
!= block
->bindings()->end_definitions());
6167 std::string n
= (*p
)->message_name();
6168 go_error_at(loc
, "goto jumps over declaration of %qs", n
.c_str());
6169 go_inform((*p
)->location(), "%qs defined here", n
.c_str());
6173 // Class Function_declaration.
6175 // Return the function descriptor.
6178 Function_declaration::descriptor(Gogo
*, Named_object
* no
)
6180 go_assert(!this->fntype_
->is_method());
6181 if (this->descriptor_
== NULL
)
6182 this->descriptor_
= Expression::make_func_descriptor(no
);
6183 return this->descriptor_
;
6188 Variable::Variable(Type
* type
, Expression
* init
, bool is_global
,
6189 bool is_parameter
, bool is_receiver
,
6191 : type_(type
), init_(init
), preinit_(NULL
), location_(location
),
6192 backend_(NULL
), is_global_(is_global
), is_parameter_(is_parameter
),
6193 is_closure_(false), is_receiver_(is_receiver
),
6194 is_varargs_parameter_(false), is_used_(false),
6195 is_address_taken_(false), is_non_escaping_address_taken_(false),
6196 seen_(false), init_is_lowered_(false), init_is_flattened_(false),
6197 type_from_init_tuple_(false), type_from_range_index_(false),
6198 type_from_range_value_(false), type_from_chan_element_(false),
6199 is_type_switch_var_(false), determined_type_(false),
6200 in_unique_section_(false), escapes_(true),
6201 toplevel_decl_(NULL
)
6203 go_assert(type
!= NULL
|| init
!= NULL
);
6204 go_assert(!is_parameter
|| init
== NULL
);
6207 // Traverse the initializer expression.
6210 Variable::traverse_expression(Traverse
* traverse
, unsigned int traverse_mask
)
6212 if (this->preinit_
!= NULL
)
6214 if (this->preinit_
->traverse(traverse
) == TRAVERSE_EXIT
)
6215 return TRAVERSE_EXIT
;
6217 if (this->init_
!= NULL
6219 & (Traverse::traverse_expressions
| Traverse::traverse_types
))
6222 if (Expression::traverse(&this->init_
, traverse
) == TRAVERSE_EXIT
)
6223 return TRAVERSE_EXIT
;
6225 return TRAVERSE_CONTINUE
;
6228 // Lower the initialization expression after parsing is complete.
6231 Variable::lower_init_expression(Gogo
* gogo
, Named_object
* function
,
6232 Statement_inserter
* inserter
)
6234 Named_object
* dep
= gogo
->var_depends_on(this);
6235 if (dep
!= NULL
&& dep
->is_variable())
6236 dep
->var_value()->lower_init_expression(gogo
, function
, inserter
);
6238 if (this->init_
!= NULL
&& !this->init_is_lowered_
)
6242 // We will give an error elsewhere, this is just to prevent
6243 // an infinite loop.
6248 Statement_inserter global_inserter
;
6249 if (this->is_global_
)
6251 global_inserter
= Statement_inserter(gogo
, this);
6252 inserter
= &global_inserter
;
6255 gogo
->lower_expression(function
, inserter
, &this->init_
);
6257 this->seen_
= false;
6259 this->init_is_lowered_
= true;
6263 // Flatten the initialization expression after ordering evaluations.
6266 Variable::flatten_init_expression(Gogo
* gogo
, Named_object
* function
,
6267 Statement_inserter
* inserter
)
6269 Named_object
* dep
= gogo
->var_depends_on(this);
6270 if (dep
!= NULL
&& dep
->is_variable())
6271 dep
->var_value()->flatten_init_expression(gogo
, function
, inserter
);
6273 if (this->init_
!= NULL
&& !this->init_is_flattened_
)
6277 // We will give an error elsewhere, this is just to prevent
6278 // an infinite loop.
6283 Statement_inserter global_inserter
;
6284 if (this->is_global_
)
6286 global_inserter
= Statement_inserter(gogo
, this);
6287 inserter
= &global_inserter
;
6290 gogo
->flatten_expression(function
, inserter
, &this->init_
);
6292 // If an interface conversion is needed, we need a temporary
6294 if (this->type_
!= NULL
6295 && !Type::are_identical(this->type_
, this->init_
->type(), false,
6297 && this->init_
->type()->interface_type() != NULL
6298 && !this->init_
->is_variable())
6300 Temporary_statement
* temp
=
6301 Statement::make_temporary(NULL
, this->init_
, this->location_
);
6302 inserter
->insert(temp
);
6303 this->init_
= Expression::make_temporary_reference(temp
,
6307 this->seen_
= false;
6308 this->init_is_flattened_
= true;
6312 // Get the preinit block.
6315 Variable::preinit_block(Gogo
* gogo
)
6317 go_assert(this->is_global_
);
6318 if (this->preinit_
== NULL
)
6319 this->preinit_
= new Block(NULL
, this->location());
6321 // If a global variable has a preinitialization statement, then we
6322 // need to have an initialization function.
6323 gogo
->set_need_init_fn();
6325 return this->preinit_
;
6328 // Add a statement to be run before the initialization expression.
6331 Variable::add_preinit_statement(Gogo
* gogo
, Statement
* s
)
6333 Block
* b
= this->preinit_block(gogo
);
6334 b
->add_statement(s
);
6335 b
->set_end_location(s
->location());
6338 // Whether this variable has a type.
6341 Variable::has_type() const
6343 if (this->type_
== NULL
)
6346 // A variable created in a type switch case nil does not actually
6347 // have a type yet. It will be changed to use the initializer's
6348 // type in determine_type.
6349 if (this->is_type_switch_var_
6350 && this->type_
->is_nil_constant_as_type())
6356 // In an assignment which sets a variable to a tuple of EXPR, return
6357 // the type of the first element of the tuple.
6360 Variable::type_from_tuple(Expression
* expr
, bool report_error
) const
6362 if (expr
->map_index_expression() != NULL
)
6364 Map_type
* mt
= expr
->map_index_expression()->get_map_type();
6366 return Type::make_error_type();
6367 return mt
->val_type();
6369 else if (expr
->receive_expression() != NULL
)
6371 Expression
* channel
= expr
->receive_expression()->channel();
6372 Type
* channel_type
= channel
->type();
6373 if (channel_type
->channel_type() == NULL
)
6374 return Type::make_error_type();
6375 return channel_type
->channel_type()->element_type();
6380 go_error_at(this->location(), "invalid tuple definition");
6381 return Type::make_error_type();
6385 // Given EXPR used in a range clause, return either the index type or
6386 // the value type of the range, depending upon GET_INDEX_TYPE.
6389 Variable::type_from_range(Expression
* expr
, bool get_index_type
,
6390 bool report_error
) const
6392 Type
* t
= expr
->type();
6393 if (t
->array_type() != NULL
6394 || (t
->points_to() != NULL
6395 && t
->points_to()->array_type() != NULL
6396 && !t
->points_to()->is_slice_type()))
6399 return Type::lookup_integer_type("int");
6401 return t
->deref()->array_type()->element_type();
6403 else if (t
->is_string_type())
6406 return Type::lookup_integer_type("int");
6408 return Type::lookup_integer_type("int32");
6410 else if (t
->map_type() != NULL
)
6413 return t
->map_type()->key_type();
6415 return t
->map_type()->val_type();
6417 else if (t
->channel_type() != NULL
)
6420 return t
->channel_type()->element_type();
6424 go_error_at(this->location(),
6425 ("invalid definition of value variable "
6426 "for channel range"));
6427 return Type::make_error_type();
6433 go_error_at(this->location(), "invalid type for range clause");
6434 return Type::make_error_type();
6438 // EXPR should be a channel. Return the channel's element type.
6441 Variable::type_from_chan_element(Expression
* expr
, bool report_error
) const
6443 Type
* t
= expr
->type();
6444 if (t
->channel_type() != NULL
)
6445 return t
->channel_type()->element_type();
6449 go_error_at(this->location(), "expected channel");
6450 return Type::make_error_type();
6454 // Return the type of the Variable. This may be called before
6455 // Variable::determine_type is called, which means that we may need to
6456 // get the type from the initializer. FIXME: If we combine lowering
6457 // with type determination, then this should be unnecessary.
6462 // A variable in a type switch with a nil case will have the wrong
6463 // type here. This gets fixed up in determine_type, below.
6464 Type
* type
= this->type_
;
6465 Expression
* init
= this->init_
;
6466 if (this->is_type_switch_var_
6468 && this->type_
->is_nil_constant_as_type())
6470 Type_guard_expression
* tge
= this->init_
->type_guard_expression();
6471 go_assert(tge
!= NULL
);
6478 if (this->type_
== NULL
|| !this->type_
->is_error_type())
6480 go_error_at(this->location_
, "variable initializer refers to itself");
6481 this->type_
= Type::make_error_type();
6490 else if (this->type_from_init_tuple_
)
6491 type
= this->type_from_tuple(init
, false);
6492 else if (this->type_from_range_index_
|| this->type_from_range_value_
)
6493 type
= this->type_from_range(init
, this->type_from_range_index_
, false);
6494 else if (this->type_from_chan_element_
)
6495 type
= this->type_from_chan_element(init
, false);
6498 go_assert(init
!= NULL
);
6499 type
= init
->type();
6500 go_assert(type
!= NULL
);
6502 // Variables should not have abstract types.
6503 if (type
->is_abstract())
6504 type
= type
->make_non_abstract_type();
6506 if (type
->is_void_type())
6507 type
= Type::make_error_type();
6510 this->seen_
= false;
6515 // Fetch the type from a const pointer, in which case it should have
6516 // been set already.
6519 Variable::type() const
6521 go_assert(this->type_
!= NULL
);
6525 // Set the type if necessary.
6528 Variable::determine_type()
6530 if (this->determined_type_
)
6532 this->determined_type_
= true;
6534 if (this->preinit_
!= NULL
)
6535 this->preinit_
->determine_types();
6537 // A variable in a type switch with a nil case will have the wrong
6538 // type here. It will have an initializer which is a type guard.
6539 // We want to initialize it to the value without the type guard, and
6540 // use the type of that value as well.
6541 if (this->is_type_switch_var_
6542 && this->type_
!= NULL
6543 && this->type_
->is_nil_constant_as_type())
6545 Type_guard_expression
* tge
= this->init_
->type_guard_expression();
6546 go_assert(tge
!= NULL
);
6548 this->init_
= tge
->expr();
6551 if (this->init_
== NULL
)
6552 go_assert(this->type_
!= NULL
&& !this->type_
->is_abstract());
6553 else if (this->type_from_init_tuple_
)
6555 Expression
*init
= this->init_
;
6556 init
->determine_type_no_context();
6557 this->type_
= this->type_from_tuple(init
, true);
6560 else if (this->type_from_range_index_
|| this->type_from_range_value_
)
6562 Expression
* init
= this->init_
;
6563 init
->determine_type_no_context();
6564 this->type_
= this->type_from_range(init
, this->type_from_range_index_
,
6568 else if (this->type_from_chan_element_
)
6570 Expression
* init
= this->init_
;
6571 init
->determine_type_no_context();
6572 this->type_
= this->type_from_chan_element(init
, true);
6577 Type_context
context(this->type_
, false);
6578 this->init_
->determine_type(&context
);
6579 if (this->type_
== NULL
)
6581 Type
* type
= this->init_
->type();
6582 go_assert(type
!= NULL
);
6583 if (type
->is_abstract())
6584 type
= type
->make_non_abstract_type();
6586 if (type
->is_void_type())
6588 go_error_at(this->location_
, "variable has no type");
6589 type
= Type::make_error_type();
6591 else if (type
->is_nil_type())
6593 go_error_at(this->location_
, "variable defined to nil type");
6594 type
= Type::make_error_type();
6596 else if (type
->is_call_multiple_result_type())
6598 go_error_at(this->location_
,
6599 "single variable set to multiple-value function call");
6600 type
= Type::make_error_type();
6608 // Get the initial value of a variable. This does not
6609 // consider whether the variable is in the heap--it returns the
6610 // initial value as though it were always stored in the stack.
6613 Variable::get_init(Gogo
* gogo
, Named_object
* function
)
6615 go_assert(this->preinit_
== NULL
);
6616 Location loc
= this->location();
6617 if (this->init_
== NULL
)
6619 go_assert(!this->is_parameter_
);
6620 if (this->is_global_
|| this->is_in_heap())
6622 Btype
* btype
= this->type()->get_backend(gogo
);
6623 return gogo
->backend()->zero_expression(btype
);
6627 Translate_context
context(gogo
, function
, NULL
, NULL
);
6628 Expression
* init
= Expression::make_cast(this->type(), this->init_
, loc
);
6629 return init
->get_backend(&context
);
6633 // Get the initial value of a variable when a block is required.
6634 // VAR_DECL is the decl to set; it may be NULL for a sink variable.
6637 Variable::get_init_block(Gogo
* gogo
, Named_object
* function
,
6638 Bvariable
* var_decl
)
6640 go_assert(this->preinit_
!= NULL
);
6642 // We want to add the variable assignment to the end of the preinit
6645 Translate_context
context(gogo
, function
, NULL
, NULL
);
6646 Bblock
* bblock
= this->preinit_
->get_backend(&context
);
6647 Bfunction
* bfunction
=
6648 function
->func_value()->get_or_make_decl(gogo
, function
);
6650 // It's possible to have pre-init statements without an initializer
6651 // if the pre-init statements set the variable.
6652 Bstatement
* decl_init
= NULL
;
6653 if (this->init_
!= NULL
)
6655 if (var_decl
== NULL
)
6657 Bexpression
* init_bexpr
= this->init_
->get_backend(&context
);
6658 decl_init
= gogo
->backend()->expression_statement(bfunction
,
6663 Location loc
= this->location();
6664 Expression
* val_expr
=
6665 Expression::make_cast(this->type(), this->init_
, loc
);
6666 Bexpression
* val
= val_expr
->get_backend(&context
);
6667 Bexpression
* var_ref
=
6668 gogo
->backend()->var_expression(var_decl
, loc
);
6669 decl_init
= gogo
->backend()->assignment_statement(bfunction
, var_ref
,
6673 Bstatement
* block_stmt
= gogo
->backend()->block_statement(bblock
);
6674 if (decl_init
!= NULL
)
6675 block_stmt
= gogo
->backend()->compound_statement(block_stmt
, decl_init
);
6679 // Export the variable
6682 Variable::export_var(Export
* exp
, const std::string
& name
) const
6684 go_assert(this->is_global_
);
6685 exp
->write_c_string("var ");
6686 exp
->write_string(name
);
6687 exp
->write_c_string(" ");
6688 exp
->write_type(this->type());
6689 exp
->write_c_string(";\n");
6692 // Import a variable.
6695 Variable::import_var(Import
* imp
, std::string
* pname
, Type
** ptype
)
6697 imp
->require_c_string("var ");
6698 *pname
= imp
->read_identifier();
6699 imp
->require_c_string(" ");
6700 *ptype
= imp
->read_type();
6701 imp
->require_c_string(";\n");
6704 // Convert a variable to the backend representation.
6707 Variable::get_backend_variable(Gogo
* gogo
, Named_object
* function
,
6708 const Package
* package
, const std::string
& name
)
6710 if (this->backend_
== NULL
)
6712 Backend
* backend
= gogo
->backend();
6713 Type
* type
= this->type_
;
6714 if (type
->is_error_type()
6715 || (type
->is_undefined()
6716 && (!this->is_global_
|| package
== NULL
)))
6717 this->backend_
= backend
->error_variable();
6720 bool is_parameter
= this->is_parameter_
;
6721 if (this->is_receiver_
&& type
->points_to() == NULL
)
6722 is_parameter
= false;
6723 if (this->is_in_heap())
6725 is_parameter
= false;
6726 type
= Type::make_pointer_type(type
);
6729 const std::string n
= Gogo::unpack_hidden_name(name
);
6730 Btype
* btype
= type
->get_backend(gogo
);
6733 if (Map_type::is_zero_value(this))
6734 bvar
= Map_type::backend_zero_value(gogo
);
6735 else if (this->is_global_
)
6737 std::string
var_name(package
!= NULL
6738 ? package
->package_name()
6739 : gogo
->package_name());
6740 var_name
.push_back('.');
6743 std::string
asm_name(gogo
->global_var_asm_name(name
, package
));
6745 bool is_hidden
= Gogo::is_hidden_name(name
);
6746 // Hack to export runtime.writeBarrier. FIXME.
6747 // This is because go:linkname doesn't work on variables.
6748 if (gogo
->compiling_runtime()
6749 && var_name
== "runtime.writeBarrier")
6752 bvar
= backend
->global_variable(var_name
,
6757 this->in_unique_section_
,
6760 else if (function
== NULL
)
6762 go_assert(saw_errors());
6763 bvar
= backend
->error_variable();
6767 Bfunction
* bfunction
= function
->func_value()->get_decl();
6768 bool is_address_taken
= (this->is_non_escaping_address_taken_
6769 && !this->is_in_heap());
6770 if (this->is_closure())
6771 bvar
= backend
->static_chain_variable(bfunction
, n
, btype
,
6773 else if (is_parameter
)
6774 bvar
= backend
->parameter_variable(bfunction
, n
, btype
,
6779 Bvariable
* bvar_decl
= NULL
;
6780 if (this->toplevel_decl_
!= NULL
)
6782 Translate_context
context(gogo
, NULL
, NULL
, NULL
);
6783 bvar_decl
= this->toplevel_decl_
->temporary_statement()
6784 ->get_backend_variable(&context
);
6786 bvar
= backend
->local_variable(bfunction
, n
, btype
,
6792 this->backend_
= bvar
;
6795 return this->backend_
;
6798 // Class Result_variable.
6800 // Convert a result variable to the backend representation.
6803 Result_variable::get_backend_variable(Gogo
* gogo
, Named_object
* function
,
6804 const std::string
& name
)
6806 if (this->backend_
== NULL
)
6808 Backend
* backend
= gogo
->backend();
6809 Type
* type
= this->type_
;
6810 if (type
->is_error())
6811 this->backend_
= backend
->error_variable();
6814 if (this->is_in_heap())
6815 type
= Type::make_pointer_type(type
);
6816 Btype
* btype
= type
->get_backend(gogo
);
6817 Bfunction
* bfunction
= function
->func_value()->get_decl();
6818 std::string n
= Gogo::unpack_hidden_name(name
);
6819 bool is_address_taken
= (this->is_non_escaping_address_taken_
6820 && !this->is_in_heap());
6821 this->backend_
= backend
->local_variable(bfunction
, n
, btype
,
6822 NULL
, is_address_taken
,
6826 return this->backend_
;
6829 // Class Named_constant.
6831 // Traverse the initializer expression.
6834 Named_constant::traverse_expression(Traverse
* traverse
)
6836 return Expression::traverse(&this->expr_
, traverse
);
6839 // Determine the type of the constant.
6842 Named_constant::determine_type()
6844 if (this->type_
!= NULL
)
6846 Type_context
context(this->type_
, false);
6847 this->expr_
->determine_type(&context
);
6851 // A constant may have an abstract type.
6852 Type_context
context(NULL
, true);
6853 this->expr_
->determine_type(&context
);
6854 this->type_
= this->expr_
->type();
6855 go_assert(this->type_
!= NULL
);
6859 // Indicate that we found and reported an error for this constant.
6862 Named_constant::set_error()
6864 this->type_
= Type::make_error_type();
6865 this->expr_
= Expression::make_error(this->location_
);
6868 // Export a constant.
6871 Named_constant::export_const(Export
* exp
, const std::string
& name
) const
6873 exp
->write_c_string("const ");
6874 exp
->write_string(name
);
6875 exp
->write_c_string(" ");
6876 if (!this->type_
->is_abstract())
6878 exp
->write_type(this->type_
);
6879 exp
->write_c_string(" ");
6881 exp
->write_c_string("= ");
6882 this->expr()->export_expression(exp
);
6883 exp
->write_c_string(";\n");
6886 // Import a constant.
6889 Named_constant::import_const(Import
* imp
, std::string
* pname
, Type
** ptype
,
6892 imp
->require_c_string("const ");
6893 *pname
= imp
->read_identifier();
6894 imp
->require_c_string(" ");
6895 if (imp
->peek_char() == '=')
6899 *ptype
= imp
->read_type();
6900 imp
->require_c_string(" ");
6902 imp
->require_c_string("= ");
6903 *pexpr
= Expression::import_expression(imp
);
6904 imp
->require_c_string(";\n");
6907 // Get the backend representation.
6910 Named_constant::get_backend(Gogo
* gogo
, Named_object
* const_no
)
6912 if (this->bconst_
== NULL
)
6914 Translate_context
subcontext(gogo
, NULL
, NULL
, NULL
);
6915 Type
* type
= this->type();
6916 Location loc
= this->location();
6918 Expression
* const_ref
= Expression::make_const_reference(const_no
, loc
);
6919 Bexpression
* const_decl
= const_ref
->get_backend(&subcontext
);
6920 if (type
!= NULL
&& type
->is_numeric_type())
6922 Btype
* btype
= type
->get_backend(gogo
);
6923 std::string name
= const_no
->get_id(gogo
);
6925 gogo
->backend()->named_constant_expression(btype
, name
,
6928 this->bconst_
= const_decl
;
6930 return this->bconst_
;
6936 Type_declaration::add_method(const std::string
& name
, Function
* function
)
6938 Named_object
* ret
= Named_object::make_function(name
, NULL
, function
);
6939 this->methods_
.push_back(ret
);
6943 // Add a method declaration.
6946 Type_declaration::add_method_declaration(const std::string
& name
,
6948 Function_type
* type
,
6951 Named_object
* ret
= Named_object::make_function_declaration(name
, package
,
6953 this->methods_
.push_back(ret
);
6957 // Return whether any methods are defined.
6960 Type_declaration::has_methods() const
6962 return !this->methods_
.empty();
6965 // Define methods for the real type.
6968 Type_declaration::define_methods(Named_type
* nt
)
6970 if (this->methods_
.empty())
6973 while (nt
->is_alias())
6975 Type
*t
= nt
->real_type()->forwarded();
6976 if (t
->named_type() != NULL
)
6977 nt
= t
->named_type();
6978 else if (t
->forward_declaration_type() != NULL
)
6980 Named_object
* no
= t
->forward_declaration_type()->named_object();
6981 Type_declaration
* td
= no
->type_declaration_value();
6982 td
->methods_
.insert(td
->methods_
.end(), this->methods_
.begin(),
6983 this->methods_
.end());
6984 this->methods_
.clear();
6989 for (std::vector
<Named_object
*>::const_iterator p
=
6990 this->methods_
.begin();
6991 p
!= this->methods_
.end();
6993 go_error_at((*p
)->location(),
6994 ("invalid receiver type "
6995 "(receiver must be a named type"));
7000 for (std::vector
<Named_object
*>::const_iterator p
= this->methods_
.begin();
7001 p
!= this->methods_
.end();
7004 if (!(*p
)->func_value()->is_sink())
7005 nt
->add_existing_method(*p
);
7009 // We are using the type. Return true if we should issue a warning.
7012 Type_declaration::using_type()
7014 bool ret
= !this->issued_warning_
;
7015 this->issued_warning_
= true;
7019 // Class Unknown_name.
7021 // Set the real named object.
7024 Unknown_name::set_real_named_object(Named_object
* no
)
7026 go_assert(this->real_named_object_
== NULL
);
7027 go_assert(!no
->is_unknown());
7028 this->real_named_object_
= no
;
7031 // Class Named_object.
7033 Named_object::Named_object(const std::string
& name
,
7034 const Package
* package
,
7035 Classification classification
)
7036 : name_(name
), package_(package
), classification_(classification
),
7037 is_redefinition_(false)
7039 if (Gogo::is_sink_name(name
))
7040 go_assert(classification
== NAMED_OBJECT_SINK
);
7043 // Make an unknown name. This is used by the parser. The name must
7044 // be resolved later. Unknown names are only added in the current
7048 Named_object::make_unknown_name(const std::string
& name
,
7051 Named_object
* named_object
= new Named_object(name
, NULL
,
7052 NAMED_OBJECT_UNKNOWN
);
7053 Unknown_name
* value
= new Unknown_name(location
);
7054 named_object
->u_
.unknown_value
= value
;
7055 return named_object
;
7061 Named_object::make_constant(const Typed_identifier
& tid
,
7062 const Package
* package
, Expression
* expr
,
7065 Named_object
* named_object
= new Named_object(tid
.name(), package
,
7066 NAMED_OBJECT_CONST
);
7067 Named_constant
* named_constant
= new Named_constant(tid
.type(), expr
,
7070 named_object
->u_
.const_value
= named_constant
;
7071 return named_object
;
7074 // Make a named type.
7077 Named_object::make_type(const std::string
& name
, const Package
* package
,
7078 Type
* type
, Location location
)
7080 Named_object
* named_object
= new Named_object(name
, package
,
7082 Named_type
* named_type
= Type::make_named_type(named_object
, type
, location
);
7083 named_object
->u_
.type_value
= named_type
;
7084 return named_object
;
7087 // Make a type declaration.
7090 Named_object::make_type_declaration(const std::string
& name
,
7091 const Package
* package
,
7094 Named_object
* named_object
= new Named_object(name
, package
,
7095 NAMED_OBJECT_TYPE_DECLARATION
);
7096 Type_declaration
* type_declaration
= new Type_declaration(location
);
7097 named_object
->u_
.type_declaration
= type_declaration
;
7098 return named_object
;
7104 Named_object::make_variable(const std::string
& name
, const Package
* package
,
7107 Named_object
* named_object
= new Named_object(name
, package
,
7109 named_object
->u_
.var_value
= variable
;
7110 return named_object
;
7113 // Make a result variable.
7116 Named_object::make_result_variable(const std::string
& name
,
7117 Result_variable
* result
)
7119 Named_object
* named_object
= new Named_object(name
, NULL
,
7120 NAMED_OBJECT_RESULT_VAR
);
7121 named_object
->u_
.result_var_value
= result
;
7122 return named_object
;
7125 // Make a sink. This is used for the special blank identifier _.
7128 Named_object::make_sink()
7130 return new Named_object("_", NULL
, NAMED_OBJECT_SINK
);
7133 // Make a named function.
7136 Named_object::make_function(const std::string
& name
, const Package
* package
,
7139 Named_object
* named_object
= new Named_object(name
, package
,
7141 named_object
->u_
.func_value
= function
;
7142 return named_object
;
7145 // Make a function declaration.
7148 Named_object::make_function_declaration(const std::string
& name
,
7149 const Package
* package
,
7150 Function_type
* fntype
,
7153 Named_object
* named_object
= new Named_object(name
, package
,
7154 NAMED_OBJECT_FUNC_DECLARATION
);
7155 Function_declaration
*func_decl
= new Function_declaration(fntype
, location
);
7156 named_object
->u_
.func_declaration_value
= func_decl
;
7157 return named_object
;
7163 Named_object::make_package(const std::string
& alias
, Package
* package
)
7165 Named_object
* named_object
= new Named_object(alias
, NULL
,
7166 NAMED_OBJECT_PACKAGE
);
7167 named_object
->u_
.package_value
= package
;
7168 return named_object
;
7171 // Return the name to use in an error message.
7174 Named_object::message_name() const
7176 if (this->package_
== NULL
)
7177 return Gogo::message_name(this->name_
);
7179 if (this->package_
->has_package_name())
7180 ret
= this->package_
->package_name();
7182 ret
= this->package_
->pkgpath();
7183 ret
= Gogo::message_name(ret
);
7185 ret
+= Gogo::message_name(this->name_
);
7189 // Set the type when a declaration is defined.
7192 Named_object::set_type_value(Named_type
* named_type
)
7194 go_assert(this->classification_
== NAMED_OBJECT_TYPE_DECLARATION
);
7195 Type_declaration
* td
= this->u_
.type_declaration
;
7196 td
->define_methods(named_type
);
7198 Named_object
* in_function
= td
->in_function(&index
);
7199 if (in_function
!= NULL
)
7200 named_type
->set_in_function(in_function
, index
);
7202 this->classification_
= NAMED_OBJECT_TYPE
;
7203 this->u_
.type_value
= named_type
;
7206 // Define a function which was previously declared.
7209 Named_object::set_function_value(Function
* function
)
7211 go_assert(this->classification_
== NAMED_OBJECT_FUNC_DECLARATION
);
7212 if (this->func_declaration_value()->has_descriptor())
7214 Expression
* descriptor
=
7215 this->func_declaration_value()->descriptor(NULL
, NULL
);
7216 function
->set_descriptor(descriptor
);
7218 this->classification_
= NAMED_OBJECT_FUNC
;
7219 // FIXME: We should free the old value.
7220 this->u_
.func_value
= function
;
7223 // Declare an unknown object as a type declaration.
7226 Named_object::declare_as_type()
7228 go_assert(this->classification_
== NAMED_OBJECT_UNKNOWN
);
7229 Unknown_name
* unk
= this->u_
.unknown_value
;
7230 this->classification_
= NAMED_OBJECT_TYPE_DECLARATION
;
7231 this->u_
.type_declaration
= new Type_declaration(unk
->location());
7235 // Return the location of a named object.
7238 Named_object::location() const
7240 switch (this->classification_
)
7243 case NAMED_OBJECT_UNINITIALIZED
:
7246 case NAMED_OBJECT_ERRONEOUS
:
7247 return Linemap::unknown_location();
7249 case NAMED_OBJECT_UNKNOWN
:
7250 return this->unknown_value()->location();
7252 case NAMED_OBJECT_CONST
:
7253 return this->const_value()->location();
7255 case NAMED_OBJECT_TYPE
:
7256 return this->type_value()->location();
7258 case NAMED_OBJECT_TYPE_DECLARATION
:
7259 return this->type_declaration_value()->location();
7261 case NAMED_OBJECT_VAR
:
7262 return this->var_value()->location();
7264 case NAMED_OBJECT_RESULT_VAR
:
7265 return this->result_var_value()->location();
7267 case NAMED_OBJECT_SINK
:
7270 case NAMED_OBJECT_FUNC
:
7271 return this->func_value()->location();
7273 case NAMED_OBJECT_FUNC_DECLARATION
:
7274 return this->func_declaration_value()->location();
7276 case NAMED_OBJECT_PACKAGE
:
7277 return this->package_value()->location();
7281 // Export a named object.
7284 Named_object::export_named_object(Export
* exp
) const
7286 switch (this->classification_
)
7289 case NAMED_OBJECT_UNINITIALIZED
:
7290 case NAMED_OBJECT_UNKNOWN
:
7293 case NAMED_OBJECT_ERRONEOUS
:
7296 case NAMED_OBJECT_CONST
:
7297 this->const_value()->export_const(exp
, this->name_
);
7300 case NAMED_OBJECT_TYPE
:
7301 this->type_value()->export_named_type(exp
, this->name_
);
7304 case NAMED_OBJECT_TYPE_DECLARATION
:
7305 go_error_at(this->type_declaration_value()->location(),
7306 "attempt to export %<%s%> which was declared but not defined",
7307 this->message_name().c_str());
7310 case NAMED_OBJECT_FUNC_DECLARATION
:
7311 this->func_declaration_value()->export_func(exp
, this->name_
);
7314 case NAMED_OBJECT_VAR
:
7315 this->var_value()->export_var(exp
, this->name_
);
7318 case NAMED_OBJECT_RESULT_VAR
:
7319 case NAMED_OBJECT_SINK
:
7322 case NAMED_OBJECT_FUNC
:
7323 this->func_value()->export_func(exp
, this->name_
);
7328 // Convert a variable to the backend representation.
7331 Named_object::get_backend_variable(Gogo
* gogo
, Named_object
* function
)
7333 if (this->classification_
== NAMED_OBJECT_VAR
)
7334 return this->var_value()->get_backend_variable(gogo
, function
,
7335 this->package_
, this->name_
);
7336 else if (this->classification_
== NAMED_OBJECT_RESULT_VAR
)
7337 return this->result_var_value()->get_backend_variable(gogo
, function
,
7343 // Return the external identifier for this object.
7346 Named_object::get_id(Gogo
* gogo
)
7348 go_assert(!this->is_variable()
7349 && !this->is_result_variable()
7350 && !this->is_type());
7351 std::string decl_name
;
7352 if (this->is_function_declaration()
7353 && !this->func_declaration_value()->asm_name().empty())
7354 decl_name
= this->func_declaration_value()->asm_name();
7357 std::string package_name
;
7358 if (this->package_
== NULL
)
7359 package_name
= gogo
->package_name();
7361 package_name
= this->package_
->package_name();
7363 // Note that this will be misleading if this is an unexported
7364 // method generated for an embedded imported type. In that case
7365 // the unexported method should have the package name of the
7366 // package from which it is imported, but we are going to give
7367 // it our package name. Fixing this would require knowing the
7368 // package name, but we only know the package path. It might be
7369 // better to use package paths here anyhow. This doesn't affect
7370 // the assembler code, because we always set that name in
7371 // Function::get_or_make_decl anyhow. FIXME.
7373 decl_name
= package_name
+ '.' + Gogo::unpack_hidden_name(this->name_
);
7375 Function_type
* fntype
;
7376 if (this->is_function())
7377 fntype
= this->func_value()->type();
7378 else if (this->is_function_declaration())
7379 fntype
= this->func_declaration_value()->type();
7382 if (fntype
!= NULL
&& fntype
->is_method())
7384 decl_name
.push_back('.');
7385 decl_name
.append(fntype
->receiver()->type()->mangled_name(gogo
));
7391 // Get the backend representation for this named object.
7394 Named_object::get_backend(Gogo
* gogo
, std::vector
<Bexpression
*>& const_decls
,
7395 std::vector
<Btype
*>& type_decls
,
7396 std::vector
<Bfunction
*>& func_decls
)
7398 // If this is a definition, avoid trying to get the backend
7399 // representation, as that can crash.
7400 if (this->is_redefinition_
)
7402 go_assert(saw_errors());
7406 switch (this->classification_
)
7408 case NAMED_OBJECT_CONST
:
7409 if (!Gogo::is_erroneous_name(this->name_
))
7410 const_decls
.push_back(this->u_
.const_value
->get_backend(gogo
, this));
7413 case NAMED_OBJECT_TYPE
:
7415 Named_type
* named_type
= this->u_
.type_value
;
7416 if (!Gogo::is_erroneous_name(this->name_
))
7417 type_decls
.push_back(named_type
->get_backend(gogo
));
7419 // We need to produce a type descriptor for every named
7420 // type, and for a pointer to every named type, since
7421 // other files or packages might refer to them. We need
7422 // to do this even for hidden types, because they might
7423 // still be returned by some function. Simply calling the
7424 // type_descriptor method is enough to create the type
7425 // descriptor, even though we don't do anything with it.
7426 if (this->package_
== NULL
&& !saw_errors())
7429 type_descriptor_pointer(gogo
, Linemap::predeclared_location());
7430 named_type
->gc_symbol_pointer(gogo
);
7431 Type
* pn
= Type::make_pointer_type(named_type
);
7432 pn
->type_descriptor_pointer(gogo
, Linemap::predeclared_location());
7433 pn
->gc_symbol_pointer(gogo
);
7438 case NAMED_OBJECT_TYPE_DECLARATION
:
7439 go_error_at(Linemap::unknown_location(),
7440 "reference to undefined type %qs",
7441 this->message_name().c_str());
7444 case NAMED_OBJECT_VAR
:
7445 case NAMED_OBJECT_RESULT_VAR
:
7446 case NAMED_OBJECT_SINK
:
7449 case NAMED_OBJECT_FUNC
:
7451 Function
* func
= this->u_
.func_value
;
7452 if (!Gogo::is_erroneous_name(this->name_
))
7453 func_decls
.push_back(func
->get_or_make_decl(gogo
, this));
7455 if (func
->block() != NULL
)
7456 func
->build(gogo
, this);
7460 case NAMED_OBJECT_ERRONEOUS
:
7470 Bindings::Bindings(Bindings
* enclosing
)
7471 : enclosing_(enclosing
), named_objects_(), bindings_()
7478 Bindings::clear_file_scope(Gogo
* gogo
)
7480 Contour::iterator p
= this->bindings_
.begin();
7481 while (p
!= this->bindings_
.end())
7484 if (p
->second
->package() != NULL
)
7486 else if (p
->second
->is_package())
7488 else if (p
->second
->is_function()
7489 && !p
->second
->func_value()->type()->is_method()
7490 && Gogo::unpack_hidden_name(p
->second
->name()) == "init")
7499 gogo
->add_file_block_name(p
->second
->name(), p
->second
->location());
7500 p
= this->bindings_
.erase(p
);
7505 // Look up a symbol.
7508 Bindings::lookup(const std::string
& name
) const
7510 Contour::const_iterator p
= this->bindings_
.find(name
);
7511 if (p
!= this->bindings_
.end())
7512 return p
->second
->resolve();
7513 else if (this->enclosing_
!= NULL
)
7514 return this->enclosing_
->lookup(name
);
7519 // Look up a symbol locally.
7522 Bindings::lookup_local(const std::string
& name
) const
7524 Contour::const_iterator p
= this->bindings_
.find(name
);
7525 if (p
== this->bindings_
.end())
7530 // Remove an object from a set of bindings. This is used for a
7531 // special case in thunks for functions which call recover.
7534 Bindings::remove_binding(Named_object
* no
)
7536 Contour::iterator pb
= this->bindings_
.find(no
->name());
7537 go_assert(pb
!= this->bindings_
.end());
7538 this->bindings_
.erase(pb
);
7539 for (std::vector
<Named_object
*>::iterator pn
= this->named_objects_
.begin();
7540 pn
!= this->named_objects_
.end();
7545 this->named_objects_
.erase(pn
);
7552 // Add a method to the list of objects. This is not added to the
7553 // lookup table. This is so that we have a single list of objects
7554 // declared at the top level, which we walk through when it's time to
7555 // convert to trees.
7558 Bindings::add_method(Named_object
* method
)
7560 this->named_objects_
.push_back(method
);
7563 // Add a generic Named_object to a Contour.
7566 Bindings::add_named_object_to_contour(Contour
* contour
,
7567 Named_object
* named_object
)
7569 go_assert(named_object
== named_object
->resolve());
7570 const std::string
& name(named_object
->name());
7571 go_assert(!Gogo::is_sink_name(name
));
7573 std::pair
<Contour::iterator
, bool> ins
=
7574 contour
->insert(std::make_pair(name
, named_object
));
7577 // The name was already there.
7578 if (named_object
->package() != NULL
7579 && ins
.first
->second
->package() == named_object
->package()
7580 && (ins
.first
->second
->classification()
7581 == named_object
->classification()))
7583 // This is a second import of the same object.
7584 return ins
.first
->second
;
7586 ins
.first
->second
= this->new_definition(ins
.first
->second
,
7588 return ins
.first
->second
;
7592 // Don't push declarations on the list. We push them on when
7593 // and if we find the definitions. That way we genericize the
7594 // functions in order.
7595 if (!named_object
->is_type_declaration()
7596 && !named_object
->is_function_declaration()
7597 && !named_object
->is_unknown())
7598 this->named_objects_
.push_back(named_object
);
7599 return named_object
;
7603 // We had an existing named object OLD_OBJECT, and we've seen a new
7604 // one NEW_OBJECT with the same name. FIXME: This does not free the
7605 // new object when we don't need it.
7608 Bindings::new_definition(Named_object
* old_object
, Named_object
* new_object
)
7610 if (new_object
->is_erroneous() && !old_object
->is_erroneous())
7614 switch (old_object
->classification())
7617 case Named_object::NAMED_OBJECT_UNINITIALIZED
:
7620 case Named_object::NAMED_OBJECT_ERRONEOUS
:
7623 case Named_object::NAMED_OBJECT_UNKNOWN
:
7625 Named_object
* real
= old_object
->unknown_value()->real_named_object();
7627 return this->new_definition(real
, new_object
);
7628 go_assert(!new_object
->is_unknown());
7629 old_object
->unknown_value()->set_real_named_object(new_object
);
7630 if (!new_object
->is_type_declaration()
7631 && !new_object
->is_function_declaration())
7632 this->named_objects_
.push_back(new_object
);
7636 case Named_object::NAMED_OBJECT_CONST
:
7639 case Named_object::NAMED_OBJECT_TYPE
:
7640 if (new_object
->is_type_declaration())
7644 case Named_object::NAMED_OBJECT_TYPE_DECLARATION
:
7645 if (new_object
->is_type_declaration())
7647 if (new_object
->is_type())
7649 old_object
->set_type_value(new_object
->type_value());
7650 new_object
->type_value()->set_named_object(old_object
);
7651 this->named_objects_
.push_back(old_object
);
7656 case Named_object::NAMED_OBJECT_VAR
:
7657 case Named_object::NAMED_OBJECT_RESULT_VAR
:
7658 // We have already given an error in the parser for cases where
7659 // one parameter or result variable redeclares another one.
7660 if ((new_object
->is_variable()
7661 && new_object
->var_value()->is_parameter())
7662 || new_object
->is_result_variable())
7666 case Named_object::NAMED_OBJECT_SINK
:
7669 case Named_object::NAMED_OBJECT_FUNC
:
7670 if (new_object
->is_function_declaration())
7672 if (!new_object
->func_declaration_value()->asm_name().empty())
7673 go_error_at(Linemap::unknown_location(),
7674 ("sorry, not implemented: "
7675 "__asm__ for function definitions"));
7676 Function_type
* old_type
= old_object
->func_value()->type();
7677 Function_type
* new_type
=
7678 new_object
->func_declaration_value()->type();
7679 if (old_type
->is_valid_redeclaration(new_type
, &reason
))
7684 case Named_object::NAMED_OBJECT_FUNC_DECLARATION
:
7686 if (new_object
->is_function())
7688 Function_type
* old_type
=
7689 old_object
->func_declaration_value()->type();
7690 Function_type
* new_type
= new_object
->func_value()->type();
7691 if (old_type
->is_valid_redeclaration(new_type
, &reason
))
7693 if (!old_object
->func_declaration_value()->asm_name().empty())
7694 go_error_at(Linemap::unknown_location(),
7695 ("sorry, not implemented: "
7696 "__asm__ for function definitions"));
7697 old_object
->set_function_value(new_object
->func_value());
7698 this->named_objects_
.push_back(old_object
);
7705 case Named_object::NAMED_OBJECT_PACKAGE
:
7709 std::string n
= old_object
->message_name();
7711 go_error_at(new_object
->location(), "redefinition of %qs", n
.c_str());
7713 go_error_at(new_object
->location(), "redefinition of %qs: %s", n
.c_str(),
7715 old_object
->set_is_redefinition();
7716 new_object
->set_is_redefinition();
7718 go_inform(old_object
->location(), "previous definition of %qs was here",
7724 // Add a named type.
7727 Bindings::add_named_type(Named_type
* named_type
)
7729 return this->add_named_object(named_type
->named_object());
7735 Bindings::add_function(const std::string
& name
, const Package
* package
,
7738 return this->add_named_object(Named_object::make_function(name
, package
,
7742 // Add a function declaration.
7745 Bindings::add_function_declaration(const std::string
& name
,
7746 const Package
* package
,
7747 Function_type
* type
,
7750 Named_object
* no
= Named_object::make_function_declaration(name
, package
,
7752 return this->add_named_object(no
);
7755 // Define a type which was previously declared.
7758 Bindings::define_type(Named_object
* no
, Named_type
* type
)
7760 no
->set_type_value(type
);
7761 this->named_objects_
.push_back(no
);
7764 // Mark all local variables as used. This is used for some types of
7768 Bindings::mark_locals_used()
7770 for (std::vector
<Named_object
*>::iterator p
= this->named_objects_
.begin();
7771 p
!= this->named_objects_
.end();
7773 if ((*p
)->is_variable())
7774 (*p
)->var_value()->set_is_used();
7777 // Traverse bindings.
7780 Bindings::traverse(Traverse
* traverse
, bool is_global
)
7782 unsigned int traverse_mask
= traverse
->traverse_mask();
7784 // We don't use an iterator because we permit the traversal to add
7785 // new global objects.
7786 const unsigned int e_or_t
= (Traverse::traverse_expressions
7787 | Traverse::traverse_types
);
7788 const unsigned int e_or_t_or_s
= (e_or_t
7789 | Traverse::traverse_statements
);
7790 for (size_t i
= 0; i
< this->named_objects_
.size(); ++i
)
7792 Named_object
* p
= this->named_objects_
[i
];
7793 int t
= TRAVERSE_CONTINUE
;
7794 switch (p
->classification())
7796 case Named_object::NAMED_OBJECT_CONST
:
7797 if ((traverse_mask
& Traverse::traverse_constants
) != 0)
7798 t
= traverse
->constant(p
, is_global
);
7799 if (t
== TRAVERSE_CONTINUE
7800 && (traverse_mask
& e_or_t
) != 0)
7802 Type
* tc
= p
->const_value()->type();
7804 && Type::traverse(tc
, traverse
) == TRAVERSE_EXIT
)
7805 return TRAVERSE_EXIT
;
7806 t
= p
->const_value()->traverse_expression(traverse
);
7810 case Named_object::NAMED_OBJECT_VAR
:
7811 case Named_object::NAMED_OBJECT_RESULT_VAR
:
7812 if ((traverse_mask
& Traverse::traverse_variables
) != 0)
7813 t
= traverse
->variable(p
);
7814 if (t
== TRAVERSE_CONTINUE
7815 && (traverse_mask
& e_or_t
) != 0)
7817 if (p
->is_result_variable()
7818 || p
->var_value()->has_type())
7820 Type
* tv
= (p
->is_variable()
7821 ? p
->var_value()->type()
7822 : p
->result_var_value()->type());
7824 && Type::traverse(tv
, traverse
) == TRAVERSE_EXIT
)
7825 return TRAVERSE_EXIT
;
7828 if (t
== TRAVERSE_CONTINUE
7829 && (traverse_mask
& e_or_t_or_s
) != 0
7830 && p
->is_variable())
7831 t
= p
->var_value()->traverse_expression(traverse
, traverse_mask
);
7834 case Named_object::NAMED_OBJECT_FUNC
:
7835 if ((traverse_mask
& Traverse::traverse_functions
) != 0)
7836 t
= traverse
->function(p
);
7838 if (t
== TRAVERSE_CONTINUE
7840 & (Traverse::traverse_variables
7841 | Traverse::traverse_constants
7842 | Traverse::traverse_functions
7843 | Traverse::traverse_blocks
7844 | Traverse::traverse_statements
7845 | Traverse::traverse_expressions
7846 | Traverse::traverse_types
)) != 0)
7847 t
= p
->func_value()->traverse(traverse
);
7850 case Named_object::NAMED_OBJECT_PACKAGE
:
7851 // These are traversed in Gogo::traverse.
7852 go_assert(is_global
);
7855 case Named_object::NAMED_OBJECT_TYPE
:
7856 if ((traverse_mask
& e_or_t
) != 0)
7857 t
= Type::traverse(p
->type_value(), traverse
);
7860 case Named_object::NAMED_OBJECT_TYPE_DECLARATION
:
7861 case Named_object::NAMED_OBJECT_FUNC_DECLARATION
:
7862 case Named_object::NAMED_OBJECT_UNKNOWN
:
7863 case Named_object::NAMED_OBJECT_ERRONEOUS
:
7866 case Named_object::NAMED_OBJECT_SINK
:
7871 if (t
== TRAVERSE_EXIT
)
7872 return TRAVERSE_EXIT
;
7875 // If we need to traverse types, check the function declarations,
7876 // which have types. Also check any methods of a type declaration.
7877 if ((traverse_mask
& e_or_t
) != 0)
7879 for (Bindings::const_declarations_iterator p
=
7880 this->begin_declarations();
7881 p
!= this->end_declarations();
7884 if (p
->second
->is_function_declaration())
7886 if (Type::traverse(p
->second
->func_declaration_value()->type(),
7889 return TRAVERSE_EXIT
;
7891 else if (p
->second
->is_type_declaration())
7893 const std::vector
<Named_object
*>* methods
=
7894 p
->second
->type_declaration_value()->methods();
7895 for (std::vector
<Named_object
*>::const_iterator pm
=
7897 pm
!= methods
->end();
7900 Named_object
* no
= *pm
;
7902 if (no
->is_function())
7903 t
= no
->func_value()->type();
7904 else if (no
->is_function_declaration())
7905 t
= no
->func_declaration_value()->type();
7908 if (Type::traverse(t
, traverse
) == TRAVERSE_EXIT
)
7909 return TRAVERSE_EXIT
;
7915 // Traverse function declarations when needed.
7916 if ((traverse_mask
& Traverse::traverse_func_declarations
) != 0)
7918 for (Bindings::const_declarations_iterator p
= this->begin_declarations();
7919 p
!= this->end_declarations();
7922 if (p
->second
->is_function_declaration())
7924 if (traverse
->function_declaration(p
->second
) == TRAVERSE_EXIT
)
7925 return TRAVERSE_EXIT
;
7930 return TRAVERSE_CONTINUE
;
7935 // Clear any references to this label.
7940 for (std::vector
<Bindings_snapshot
*>::iterator p
= this->refs_
.begin();
7941 p
!= this->refs_
.end();
7944 this->refs_
.clear();
7947 // Get the backend representation for a label.
7950 Label::get_backend_label(Translate_context
* context
)
7952 if (this->blabel_
== NULL
)
7954 Function
* function
= context
->function()->func_value();
7955 Bfunction
* bfunction
= function
->get_decl();
7956 this->blabel_
= context
->backend()->label(bfunction
, this->name_
,
7959 return this->blabel_
;
7962 // Return an expression for the address of this label.
7965 Label::get_addr(Translate_context
* context
, Location location
)
7967 Blabel
* label
= this->get_backend_label(context
);
7968 return context
->backend()->label_address(label
, location
);
7971 // Return the dummy label that represents any instance of the blank label.
7974 Label::create_dummy_label()
7976 static Label
* dummy_label
;
7977 if (dummy_label
== NULL
)
7979 dummy_label
= new Label("_");
7980 dummy_label
->set_is_used();
7985 // Class Unnamed_label.
7987 // Get the backend representation for an unnamed label.
7990 Unnamed_label::get_blabel(Translate_context
* context
)
7992 if (this->blabel_
== NULL
)
7994 Function
* function
= context
->function()->func_value();
7995 Bfunction
* bfunction
= function
->get_decl();
7996 this->blabel_
= context
->backend()->label(bfunction
, "",
7999 return this->blabel_
;
8002 // Return a statement which defines this unnamed label.
8005 Unnamed_label::get_definition(Translate_context
* context
)
8007 Blabel
* blabel
= this->get_blabel(context
);
8008 return context
->backend()->label_definition_statement(blabel
);
8011 // Return a goto statement to this unnamed label.
8014 Unnamed_label::get_goto(Translate_context
* context
, Location location
)
8016 Blabel
* blabel
= this->get_blabel(context
);
8017 return context
->backend()->goto_statement(blabel
, location
);
8022 Package::Package(const std::string
& pkgpath
,
8023 const std::string
& pkgpath_symbol
, Location location
)
8024 : pkgpath_(pkgpath
), pkgpath_symbol_(pkgpath_symbol
),
8025 package_name_(), bindings_(new Bindings(NULL
)),
8028 go_assert(!pkgpath
.empty());
8031 // Set the package name.
8034 Package::set_package_name(const std::string
& package_name
, Location location
)
8036 go_assert(!package_name
.empty());
8037 if (this->package_name_
.empty())
8038 this->package_name_
= package_name
;
8039 else if (this->package_name_
!= package_name
)
8040 go_error_at(location
,
8041 ("saw two different packages with "
8042 "the same package path %s: %s, %s"),
8043 this->pkgpath_
.c_str(), this->package_name_
.c_str(),
8044 package_name
.c_str());
8047 // Return the pkgpath symbol, which is a prefix for symbols defined in
8051 Package::pkgpath_symbol() const
8053 if (this->pkgpath_symbol_
.empty())
8054 return Gogo::pkgpath_for_symbol(this->pkgpath_
);
8055 return this->pkgpath_symbol_
;
8058 // Set the package path symbol.
8061 Package::set_pkgpath_symbol(const std::string
& pkgpath_symbol
)
8063 go_assert(!pkgpath_symbol
.empty());
8064 if (this->pkgpath_symbol_
.empty())
8065 this->pkgpath_symbol_
= pkgpath_symbol
;
8067 go_assert(this->pkgpath_symbol_
== pkgpath_symbol
);
8070 // Note that symbol from this package was and qualified by ALIAS.
8073 Package::note_usage(const std::string
& alias
) const
8075 Aliases::const_iterator p
= this->aliases_
.find(alias
);
8076 go_assert(p
!= this->aliases_
.end());
8077 p
->second
->note_usage();
8080 // Forget a given usage. If forgetting this usage means this package becomes
8081 // unused, report that error.
8084 Package::forget_usage(Expression
* usage
) const
8086 if (this->fake_uses_
.empty())
8089 std::set
<Expression
*>::iterator p
= this->fake_uses_
.find(usage
);
8090 go_assert(p
!= this->fake_uses_
.end());
8091 this->fake_uses_
.erase(p
);
8093 if (this->fake_uses_
.empty())
8094 go_error_at(this->location(), "imported and not used: %s",
8095 Gogo::message_name(this->package_name()).c_str());
8098 // Clear the used field for the next file. If the only usages of this package
8099 // are possibly fake, keep the fake usages for lowering.
8102 Package::clear_used()
8104 std::string dot_alias
= "." + this->package_name();
8105 Aliases::const_iterator p
= this->aliases_
.find(dot_alias
);
8106 if (p
!= this->aliases_
.end() && p
->second
->used() > this->fake_uses_
.size())
8107 this->fake_uses_
.clear();
8109 this->aliases_
.clear();
8113 Package::add_alias(const std::string
& alias
, Location location
)
8115 Aliases::const_iterator p
= this->aliases_
.find(alias
);
8116 if (p
== this->aliases_
.end())
8118 std::pair
<Aliases::iterator
, bool> ret
;
8119 ret
= this->aliases_
.insert(std::make_pair(alias
,
8120 new Package_alias(location
)));
8126 // Determine types of constants. Everything else in a package
8127 // (variables, function declarations) should already have a fixed
8128 // type. Constants may have abstract types.
8131 Package::determine_types()
8133 Bindings
* bindings
= this->bindings_
;
8134 for (Bindings::const_definitions_iterator p
= bindings
->begin_definitions();
8135 p
!= bindings
->end_definitions();
8138 if ((*p
)->is_const())
8139 (*p
)->const_value()->determine_type();
8147 Traverse::~Traverse()
8149 if (this->types_seen_
!= NULL
)
8150 delete this->types_seen_
;
8151 if (this->expressions_seen_
!= NULL
)
8152 delete this->expressions_seen_
;
8155 // Record that we are looking at a type, and return true if we have
8159 Traverse::remember_type(const Type
* type
)
8161 if (type
->is_error_type())
8163 go_assert((this->traverse_mask() & traverse_types
) != 0
8164 || (this->traverse_mask() & traverse_expressions
) != 0);
8165 // We mostly only have to remember named types. But it turns out
8166 // that an interface type can refer to itself without using a name
8167 // by relying on interface inheritance, as in
8168 // type I interface { F() interface{I} }
8169 if (type
->classification() != Type::TYPE_NAMED
8170 && type
->classification() != Type::TYPE_INTERFACE
)
8172 if (this->types_seen_
== NULL
)
8173 this->types_seen_
= new Types_seen();
8174 std::pair
<Types_seen::iterator
, bool> ins
= this->types_seen_
->insert(type
);
8178 // Record that we are looking at an expression, and return true if we
8179 // have already seen it. NB: this routine used to assert if the traverse
8180 // mask did not include expressions/types -- this is no longer the case,
8181 // since it can be useful to remember specific expressions during
8182 // walks that only cover statements.
8185 Traverse::remember_expression(const Expression
* expression
)
8187 if (this->expressions_seen_
== NULL
)
8188 this->expressions_seen_
= new Expressions_seen();
8189 std::pair
<Expressions_seen::iterator
, bool> ins
=
8190 this->expressions_seen_
->insert(expression
);
8194 // The default versions of these functions should never be called: the
8195 // traversal mask indicates which functions may be called.
8198 Traverse::variable(Named_object
*)
8204 Traverse::constant(Named_object
*, bool)
8210 Traverse::function(Named_object
*)
8216 Traverse::block(Block
*)
8222 Traverse::statement(Block
*, size_t*, Statement
*)
8228 Traverse::expression(Expression
**)
8234 Traverse::type(Type
*)
8240 Traverse::function_declaration(Named_object
*)
8245 // Class Statement_inserter.
8248 Statement_inserter::insert(Statement
* s
)
8250 if (this->block_
!= NULL
)
8252 go_assert(this->pindex_
!= NULL
);
8253 this->block_
->insert_statement_before(*this->pindex_
, s
);
8256 else if (this->var_
!= NULL
)
8257 this->var_
->add_preinit_statement(this->gogo_
, s
);
8259 go_assert(saw_errors());