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.
13 #include "statements.h"
14 #include "expressions.h"
22 Gogo::Gogo(int int_type_size
, int float_type_size
, int pointer_size
)
25 globals_(new Bindings(NULL
)),
27 imported_unsafe_(false),
29 map_descriptors_(NULL
),
30 type_descriptor_decls_(NULL
),
38 const source_location loc
= BUILTINS_LOCATION
;
40 Named_type
* uint8_type
= Type::make_integer_type("uint8", true, 8,
41 RUNTIME_TYPE_KIND_UINT8
);
42 this->add_named_type(uint8_type
);
43 this->add_named_type(Type::make_integer_type("uint16", true, 16,
44 RUNTIME_TYPE_KIND_UINT16
));
45 this->add_named_type(Type::make_integer_type("uint32", true, 32,
46 RUNTIME_TYPE_KIND_UINT32
));
47 this->add_named_type(Type::make_integer_type("uint64", true, 64,
48 RUNTIME_TYPE_KIND_UINT64
));
50 this->add_named_type(Type::make_integer_type("int8", false, 8,
51 RUNTIME_TYPE_KIND_INT8
));
52 this->add_named_type(Type::make_integer_type("int16", false, 16,
53 RUNTIME_TYPE_KIND_INT16
));
54 this->add_named_type(Type::make_integer_type("int32", false, 32,
55 RUNTIME_TYPE_KIND_INT32
));
56 this->add_named_type(Type::make_integer_type("int64", false, 64,
57 RUNTIME_TYPE_KIND_INT64
));
59 this->add_named_type(Type::make_float_type("float32", 32,
60 RUNTIME_TYPE_KIND_FLOAT32
));
61 this->add_named_type(Type::make_float_type("float64", 64,
62 RUNTIME_TYPE_KIND_FLOAT64
));
64 this->add_named_type(Type::make_complex_type("complex64", 64,
65 RUNTIME_TYPE_KIND_COMPLEX64
));
66 this->add_named_type(Type::make_complex_type("complex128", 128,
67 RUNTIME_TYPE_KIND_COMPLEX128
));
69 if (int_type_size
< 32)
71 this->add_named_type(Type::make_integer_type("uint", true,
73 RUNTIME_TYPE_KIND_UINT
));
74 Named_type
* int_type
= Type::make_integer_type("int", false, int_type_size
,
75 RUNTIME_TYPE_KIND_INT
);
76 this->add_named_type(int_type
);
78 // "byte" is an alias for "uint8". Construct a Named_object which
79 // points to UINT8_TYPE. Note that this breaks the normal pairing
80 // in which a Named_object points to a Named_type which points back
81 // to the same Named_object.
82 Named_object
* byte_type
= this->declare_type("byte", loc
);
83 byte_type
->set_type_value(uint8_type
);
85 this->add_named_type(Type::make_integer_type("uintptr", true,
87 RUNTIME_TYPE_KIND_UINTPTR
));
89 this->add_named_type(Type::make_float_type("float", float_type_size
,
90 RUNTIME_TYPE_KIND_FLOAT
));
92 this->add_named_type(Type::make_complex_type("complex", float_type_size
* 2,
93 RUNTIME_TYPE_KIND_COMPLEX
));
95 this->add_named_type(Type::make_named_bool_type());
97 this->add_named_type(Type::make_named_string_type());
99 this->globals_
->add_constant(Typed_identifier("true",
100 Type::make_boolean_type(),
103 Expression::make_boolean(true, loc
),
105 this->globals_
->add_constant(Typed_identifier("false",
106 Type::make_boolean_type(),
109 Expression::make_boolean(false, loc
),
112 this->globals_
->add_constant(Typed_identifier("nil", Type::make_nil_type(),
115 Expression::make_nil(loc
),
118 Type
* abstract_int_type
= Type::make_abstract_integer_type();
119 this->globals_
->add_constant(Typed_identifier("iota", abstract_int_type
,
122 Expression::make_iota(),
125 Function_type
* new_type
= Type::make_function_type(NULL
, NULL
, NULL
, loc
);
126 new_type
->set_is_varargs();
127 new_type
->set_is_builtin();
128 this->globals_
->add_function_declaration("new", NULL
, new_type
, loc
);
130 Function_type
* make_type
= Type::make_function_type(NULL
, NULL
, NULL
, loc
);
131 make_type
->set_is_varargs();
132 make_type
->set_is_builtin();
133 this->globals_
->add_function_declaration("make", NULL
, make_type
, loc
);
135 Typed_identifier_list
* len_result
= new Typed_identifier_list();
136 len_result
->push_back(Typed_identifier("", int_type
, loc
));
137 Function_type
* len_type
= Type::make_function_type(NULL
, NULL
, len_result
,
139 len_type
->set_is_builtin();
140 this->globals_
->add_function_declaration("len", NULL
, len_type
, loc
);
142 Typed_identifier_list
* cap_result
= new Typed_identifier_list();
143 cap_result
->push_back(Typed_identifier("", int_type
, loc
));
144 Function_type
* cap_type
= Type::make_function_type(NULL
, NULL
, len_result
,
146 cap_type
->set_is_builtin();
147 this->globals_
->add_function_declaration("cap", NULL
, cap_type
, loc
);
149 Function_type
* print_type
= Type::make_function_type(NULL
, NULL
, NULL
, loc
);
150 print_type
->set_is_varargs();
151 print_type
->set_is_builtin();
152 this->globals_
->add_function_declaration("print", NULL
, print_type
, loc
);
154 print_type
= Type::make_function_type(NULL
, NULL
, NULL
, loc
);
155 print_type
->set_is_varargs();
156 print_type
->set_is_builtin();
157 this->globals_
->add_function_declaration("println", NULL
, print_type
, loc
);
159 Type
*empty
= Type::make_interface_type(NULL
, loc
);
160 Typed_identifier_list
* panic_parms
= new Typed_identifier_list();
161 panic_parms
->push_back(Typed_identifier("e", empty
, loc
));
162 Function_type
*panic_type
= Type::make_function_type(NULL
, panic_parms
,
164 panic_type
->set_is_builtin();
165 this->globals_
->add_function_declaration("panic", NULL
, panic_type
, loc
);
167 Typed_identifier_list
* recover_result
= new Typed_identifier_list();
168 recover_result
->push_back(Typed_identifier("", empty
, loc
));
169 Function_type
* recover_type
= Type::make_function_type(NULL
, NULL
,
172 recover_type
->set_is_builtin();
173 this->globals_
->add_function_declaration("recover", NULL
, recover_type
, loc
);
175 Function_type
* close_type
= Type::make_function_type(NULL
, NULL
, NULL
, loc
);
176 close_type
->set_is_varargs();
177 close_type
->set_is_builtin();
178 this->globals_
->add_function_declaration("close", NULL
, close_type
, loc
);
180 Typed_identifier_list
* closed_result
= new Typed_identifier_list();
181 closed_result
->push_back(Typed_identifier("", Type::lookup_bool_type(),
183 Function_type
* closed_type
= Type::make_function_type(NULL
, NULL
,
185 closed_type
->set_is_varargs();
186 closed_type
->set_is_builtin();
187 this->globals_
->add_function_declaration("closed", NULL
, closed_type
, loc
);
189 Typed_identifier_list
* copy_result
= new Typed_identifier_list();
190 copy_result
->push_back(Typed_identifier("", int_type
, loc
));
191 Function_type
* copy_type
= Type::make_function_type(NULL
, NULL
,
193 copy_type
->set_is_varargs();
194 copy_type
->set_is_builtin();
195 this->globals_
->add_function_declaration("copy", NULL
, copy_type
, loc
);
197 Function_type
* append_type
= Type::make_function_type(NULL
, NULL
, NULL
, loc
);
198 append_type
->set_is_varargs();
199 append_type
->set_is_builtin();
200 this->globals_
->add_function_declaration("append", NULL
, append_type
, loc
);
202 Function_type
* cmplx_type
= Type::make_function_type(NULL
, NULL
, NULL
, loc
);
203 cmplx_type
->set_is_varargs();
204 cmplx_type
->set_is_builtin();
205 this->globals_
->add_function_declaration("cmplx", NULL
, cmplx_type
, loc
);
207 Function_type
* real_type
= Type::make_function_type(NULL
, NULL
, NULL
, loc
);
208 real_type
->set_is_varargs();
209 real_type
->set_is_builtin();
210 this->globals_
->add_function_declaration("real", NULL
, real_type
, loc
);
212 Function_type
* imag_type
= Type::make_function_type(NULL
, NULL
, NULL
, loc
);
213 imag_type
->set_is_varargs();
214 imag_type
->set_is_builtin();
215 this->globals_
->add_function_declaration("imag", NULL
, cmplx_type
, loc
);
217 this->define_builtin_function_trees();
219 // Declare "init", to ensure that it is not defined with parameters
221 this->declare_function("init",
222 Type::make_function_type(NULL
, NULL
, NULL
, loc
),
226 // Munge name for use in an error message.
229 Gogo::message_name(const std::string
& name
)
231 return go_localize_identifier(Gogo::unpack_hidden_name(name
).c_str());
234 // Get the package name.
237 Gogo::package_name() const
239 gcc_assert(this->package_
!= NULL
);
240 return this->package_
->name();
243 // Set the package name.
246 Gogo::set_package_name(const std::string
& package_name
,
247 source_location location
)
249 if (this->package_
!= NULL
&& this->package_
->name() != package_name
)
251 error_at(location
, "expected package %<%s%>",
252 Gogo::message_name(this->package_
->name()).c_str());
256 // If the user did not specify a unique prefix, we always use "go".
257 // This in effect requires that the package name be unique.
258 if (this->unique_prefix_
.empty())
259 this->unique_prefix_
= "go";
261 this->package_
= this->register_package(package_name
, this->unique_prefix_
,
264 // We used to permit people to qualify symbols with the current
265 // package name (e.g., P.x), but we no longer do.
266 // this->globals_->add_package(package_name, this->package_);
268 if (package_name
== "main")
270 // Declare "main" as a function which takes no parameters and
272 this->declare_function("main",
273 Type::make_function_type(NULL
, NULL
, NULL
,
282 Gogo::import_package(const std::string
& filename
,
283 const std::string
& local_name
,
284 bool is_local_name_exported
,
285 source_location location
)
287 if (filename
== "unsafe")
289 this->import_unsafe(local_name
, is_local_name_exported
, location
);
293 Imports::const_iterator p
= this->imports_
.find(filename
);
294 if (p
!= this->imports_
.end())
296 Package
* package
= p
->second
;
297 package
->set_location(location
);
298 package
->set_is_imported();
299 std::string ln
= local_name
;
300 bool is_ln_exported
= is_local_name_exported
;
303 ln
= package
->name();
304 is_ln_exported
= Lex::is_exported_name(ln
);
308 ln
= this->pack_hidden_name(ln
, is_ln_exported
);
309 this->package_
->bindings()->add_package(ln
, package
);
313 Bindings
* bindings
= package
->bindings();
314 for (Bindings::const_declarations_iterator p
=
315 bindings
->begin_declarations();
316 p
!= bindings
->end_declarations();
318 this->add_named_object(p
->second
);
323 Import::Stream
* stream
= Import::open_package(filename
, location
);
326 error_at(location
, "import file %qs not found", filename
.c_str());
330 Import
imp(stream
, location
);
331 imp
.register_builtin_types(this);
332 Package
* package
= imp
.import(this, local_name
, is_local_name_exported
);
333 this->imports_
.insert(std::make_pair(filename
, package
));
334 package
->set_is_imported();
339 // Add an import control function for an imported package to the list.
342 Gogo::add_import_init_fn(const std::string
& package_name
,
343 const std::string
& init_name
, int prio
)
345 for (std::set
<Import_init
>::const_iterator p
=
346 this->imported_init_fns_
.begin();
347 p
!= this->imported_init_fns_
.end();
350 if (p
->init_name() == init_name
351 && (p
->package_name() != package_name
|| p
->priority() != prio
))
353 error("duplicate package initialization name %qs",
354 Gogo::message_name(init_name
).c_str());
355 inform(UNKNOWN_LOCATION
, "used by package %qs at priority %d",
356 Gogo::message_name(p
->package_name()).c_str(),
358 inform(UNKNOWN_LOCATION
, " and by package %qs at priority %d",
359 Gogo::message_name(package_name
).c_str(), prio
);
364 this->imported_init_fns_
.insert(Import_init(package_name
, init_name
,
368 // Return whether we are at the global binding level.
371 Gogo::in_global_scope() const
373 return this->functions_
.empty();
376 // Return the current binding contour.
379 Gogo::current_bindings()
381 if (!this->functions_
.empty())
382 return this->functions_
.back().blocks
.back()->bindings();
383 else if (this->package_
!= NULL
)
384 return this->package_
->bindings();
386 return this->globals_
;
390 Gogo::current_bindings() const
392 if (!this->functions_
.empty())
393 return this->functions_
.back().blocks
.back()->bindings();
394 else if (this->package_
!= NULL
)
395 return this->package_
->bindings();
397 return this->globals_
;
400 // Return the current block.
403 Gogo::current_block()
405 if (this->functions_
.empty())
408 return this->functions_
.back().blocks
.back();
411 // Look up a name in the current binding contour. If PFUNCTION is not
412 // NULL, set it to the function in which the name is defined, or NULL
413 // if the name is defined in global scope.
416 Gogo::lookup(const std::string
& name
, Named_object
** pfunction
) const
418 if (pfunction
!= NULL
)
421 if (Gogo::is_sink_name(name
))
422 return Named_object::make_sink();
424 for (Open_functions::const_reverse_iterator p
= this->functions_
.rbegin();
425 p
!= this->functions_
.rend();
428 Named_object
* ret
= p
->blocks
.back()->bindings()->lookup(name
);
431 if (pfunction
!= NULL
)
432 *pfunction
= p
->function
;
437 if (this->package_
!= NULL
)
439 Named_object
* ret
= this->package_
->bindings()->lookup(name
);
442 if (ret
->package() != NULL
)
443 ret
->package()->set_used();
448 // We do not look in the global namespace. If we did, the global
449 // namespace would effectively hide names which were defined in
450 // package scope which we have not yet seen. Instead,
451 // define_global_names is called after parsing is over to connect
452 // undefined names at package scope with names defined at global
458 // Look up a name in the current block, without searching enclosing
462 Gogo::lookup_in_block(const std::string
& name
) const
464 gcc_assert(!this->functions_
.empty());
465 gcc_assert(!this->functions_
.back().blocks
.empty());
466 return this->functions_
.back().blocks
.back()->bindings()->lookup_local(name
);
469 // Look up a name in the global namespace.
472 Gogo::lookup_global(const char* name
) const
474 return this->globals_
->lookup(name
);
477 // Add an imported package.
480 Gogo::add_imported_package(const std::string
& real_name
,
481 const std::string
& alias_arg
,
482 bool is_alias_exported
,
483 const std::string
& unique_prefix
,
484 source_location location
,
485 bool* padd_to_globals
)
487 // FIXME: Now that we compile packages as a whole, should we permit
488 // importing the current package?
489 if (this->package_name() == real_name
490 && this->unique_prefix() == unique_prefix
)
492 *padd_to_globals
= false;
493 if (!alias_arg
.empty() && alias_arg
!= ".")
495 std::string alias
= this->pack_hidden_name(alias_arg
,
497 this->package_
->bindings()->add_package(alias
, this->package_
);
499 return this->package_
;
501 else if (alias_arg
== ".")
503 *padd_to_globals
= true;
504 return this->register_package(real_name
, unique_prefix
, location
);
506 else if (alias_arg
== "_")
508 Package
* ret
= this->register_package(real_name
, unique_prefix
, location
);
509 ret
->set_uses_sink_alias();
514 *padd_to_globals
= false;
515 std::string alias
= alias_arg
;
519 is_alias_exported
= Lex::is_exported_name(alias
);
521 alias
= this->pack_hidden_name(alias
, is_alias_exported
);
522 Named_object
* no
= this->add_package(real_name
, alias
, unique_prefix
,
524 if (!no
->is_package())
526 return no
->package_value();
533 Gogo::add_package(const std::string
& real_name
, const std::string
& alias
,
534 const std::string
& unique_prefix
, source_location location
)
536 gcc_assert(this->in_global_scope());
538 // Register the package. Note that we might have already seen it in
539 // an earlier import.
540 Package
* package
= this->register_package(real_name
, unique_prefix
, location
);
542 return this->package_
->bindings()->add_package(alias
, package
);
545 // Register a package. This package may or may not be imported. This
546 // returns the Package structure for the package, creating if it
550 Gogo::register_package(const std::string
& package_name
,
551 const std::string
& unique_prefix
,
552 source_location location
)
554 gcc_assert(!unique_prefix
.empty() && !package_name
.empty());
555 std::string name
= unique_prefix
+ '.' + package_name
;
556 Package
* package
= NULL
;
557 std::pair
<Packages::iterator
, bool> ins
=
558 this->packages_
.insert(std::make_pair(name
, package
));
561 // We have seen this package name before.
562 package
= ins
.first
->second
;
563 gcc_assert(package
!= NULL
);
564 gcc_assert(package
->name() == package_name
565 && package
->unique_prefix() == unique_prefix
);
566 if (package
->location() == UNKNOWN_LOCATION
)
567 package
->set_location(location
);
571 // First time we have seen this package name.
572 package
= new Package(package_name
, unique_prefix
, location
);
573 gcc_assert(ins
.first
->second
== NULL
);
574 ins
.first
->second
= package
;
580 // Start compiling a function.
583 Gogo::start_function(const std::string
& name
, Function_type
* type
,
584 bool add_method_to_type
, source_location location
)
586 bool at_top_level
= this->functions_
.empty();
588 Block
* block
= new Block(NULL
, location
);
590 Function
* enclosing
= (at_top_level
592 : this->functions_
.back().function
->func_value());
594 Function
* function
= new Function(type
, enclosing
, block
, location
);
596 if (type
->is_method())
598 const Typed_identifier
* receiver
= type
->receiver();
599 Variable
* this_param
= new Variable(receiver
->type(), NULL
, false,
600 true, true, location
);
601 std::string name
= receiver
->name();
604 // We need to give receivers a name since they wind up in
605 // DECL_ARGUMENTS. FIXME.
606 static unsigned int count
;
608 snprintf(buf
, sizeof buf
, "r.%u", count
);
612 block
->bindings()->add_variable(name
, NULL
, this_param
);
615 const Typed_identifier_list
* parameters
= type
->parameters();
616 bool is_varargs
= type
->is_varargs();
617 if (parameters
!= NULL
)
619 for (Typed_identifier_list::const_iterator p
= parameters
->begin();
620 p
!= parameters
->end();
623 Variable
* param
= new Variable(p
->type(), NULL
, false, true, false,
625 if (is_varargs
&& p
+ 1 == parameters
->end())
626 param
->set_is_varargs_parameter();
628 std::string name
= p
->name();
629 if (name
.empty() || Gogo::is_sink_name(name
))
631 // We need to give parameters a name since they wind up
632 // in DECL_ARGUMENTS. FIXME.
633 static unsigned int count
;
635 snprintf(buf
, sizeof buf
, "p.%u", count
);
639 block
->bindings()->add_variable(name
, NULL
, param
);
643 function
->create_named_result_variables(this);
645 const std::string
* pname
;
646 std::string nested_name
;
651 // Invent a name for a nested function.
652 static int nested_count
;
654 snprintf(buf
, sizeof buf
, ".$nested%d", nested_count
);
657 pname
= &nested_name
;
661 if (Gogo::is_sink_name(*pname
))
663 static int sink_count
;
665 snprintf(buf
, sizeof buf
, ".$sink%d", sink_count
);
667 ret
= Named_object::make_function(buf
, NULL
, function
);
669 else if (!type
->is_method())
671 ret
= this->package_
->bindings()->add_function(*pname
, NULL
, function
);
672 if (!ret
->is_function())
674 // Redefinition error.
675 ret
= Named_object::make_function(name
, NULL
, function
);
680 if (!add_method_to_type
)
681 ret
= Named_object::make_function(name
, NULL
, function
);
684 gcc_assert(at_top_level
);
685 Type
* rtype
= type
->receiver()->type();
687 // We want to look through the pointer created by the
688 // parser, without getting an error if the type is not yet
690 if (rtype
->classification() == Type::TYPE_POINTER
)
691 rtype
= rtype
->points_to();
693 if (rtype
->is_error_type())
694 ret
= Named_object::make_function(name
, NULL
, function
);
695 else if (rtype
->named_type() != NULL
)
697 ret
= rtype
->named_type()->add_method(name
, function
);
698 if (!ret
->is_function())
700 // Redefinition error.
701 ret
= Named_object::make_function(name
, NULL
, function
);
704 else if (rtype
->forward_declaration_type() != NULL
)
706 Named_object
* type_no
=
707 rtype
->forward_declaration_type()->named_object();
708 if (type_no
->is_unknown())
710 // If we are seeing methods it really must be a
711 // type. Declare it as such. An alternative would
712 // be to support lists of methods for unknown
713 // expressions. Either way the error messages if
714 // this is not a type are going to get confusing.
715 Named_object
* declared
=
716 this->declare_package_type(type_no
->name(),
717 type_no
->location());
719 == type_no
->unknown_value()->real_named_object());
721 ret
= rtype
->forward_declaration_type()->add_method(name
,
727 this->package_
->bindings()->add_method(ret
);
730 this->functions_
.resize(this->functions_
.size() + 1);
731 Open_function
& of(this->functions_
.back());
733 of
.blocks
.push_back(block
);
735 if (!type
->is_method() && Gogo::unpack_hidden_name(name
) == "init")
737 this->init_functions_
.push_back(ret
);
738 this->need_init_fn_
= true;
744 // Finish compiling a function.
747 Gogo::finish_function(source_location location
)
749 this->finish_block(location
);
750 gcc_assert(this->functions_
.back().blocks
.empty());
751 this->functions_
.pop_back();
754 // Return the current function.
757 Gogo::current_function() const
759 gcc_assert(!this->functions_
.empty());
760 return this->functions_
.back().function
;
763 // Start a new block.
766 Gogo::start_block(source_location location
)
768 gcc_assert(!this->functions_
.empty());
769 Block
* block
= new Block(this->current_block(), location
);
770 this->functions_
.back().blocks
.push_back(block
);
776 Gogo::finish_block(source_location location
)
778 gcc_assert(!this->functions_
.empty());
779 gcc_assert(!this->functions_
.back().blocks
.empty());
780 Block
* block
= this->functions_
.back().blocks
.back();
781 this->functions_
.back().blocks
.pop_back();
782 block
->set_end_location(location
);
786 // Add an unknown name.
789 Gogo::add_unknown_name(const std::string
& name
, source_location location
)
791 return this->package_
->bindings()->add_unknown_name(name
, location
);
794 // Declare a function.
797 Gogo::declare_function(const std::string
& name
, Function_type
* type
,
798 source_location location
)
800 if (!type
->is_method())
801 return this->current_bindings()->add_function_declaration(name
, NULL
, type
,
805 // We don't bother to add this to the list of global
807 Type
* rtype
= type
->receiver()->type();
809 // We want to look through the pointer created by the
810 // parser, without getting an error if the type is not yet
812 if (rtype
->classification() == Type::TYPE_POINTER
)
813 rtype
= rtype
->points_to();
815 if (rtype
->is_error_type())
817 else if (rtype
->named_type() != NULL
)
818 return rtype
->named_type()->add_method_declaration(name
, NULL
, type
,
820 else if (rtype
->forward_declaration_type() != NULL
)
822 Forward_declaration_type
* ftype
= rtype
->forward_declaration_type();
823 return ftype
->add_method_declaration(name
, type
, location
);
830 // Add a label definition.
833 Gogo::add_label_definition(const std::string
& label_name
,
834 source_location location
)
836 gcc_assert(!this->functions_
.empty());
837 Function
* func
= this->functions_
.back().function
->func_value();
838 Label
* label
= func
->add_label_definition(label_name
, location
);
839 this->add_statement(Statement::make_label_statement(label
, location
));
843 // Add a label reference.
846 Gogo::add_label_reference(const std::string
& label_name
)
848 gcc_assert(!this->functions_
.empty());
849 Function
* func
= this->functions_
.back().function
->func_value();
850 return func
->add_label_reference(label_name
);
856 Gogo::add_statement(Statement
* statement
)
858 gcc_assert(!this->functions_
.empty()
859 && !this->functions_
.back().blocks
.empty());
860 this->functions_
.back().blocks
.back()->add_statement(statement
);
866 Gogo::add_block(Block
* block
, source_location location
)
868 gcc_assert(!this->functions_
.empty()
869 && !this->functions_
.back().blocks
.empty());
870 Statement
* statement
= Statement::make_block_statement(block
, location
);
871 this->functions_
.back().blocks
.back()->add_statement(statement
);
877 Gogo::add_constant(const Typed_identifier
& tid
, Expression
* expr
,
880 return this->current_bindings()->add_constant(tid
, NULL
, expr
, iota_value
);
886 Gogo::add_type(const std::string
& name
, Type
* type
, source_location location
)
888 Named_object
* no
= this->current_bindings()->add_type(name
, NULL
, type
,
890 if (!this->in_global_scope() && no
->is_type())
891 no
->type_value()->set_in_function(this->functions_
.back().function
);
897 Gogo::add_named_type(Named_type
* type
)
899 gcc_assert(this->in_global_scope());
900 this->current_bindings()->add_named_type(type
);
906 Gogo::declare_type(const std::string
& name
, source_location location
)
908 Bindings
* bindings
= this->current_bindings();
909 Named_object
* no
= bindings
->add_type_declaration(name
, NULL
, location
);
910 if (!this->in_global_scope() && no
->is_type_declaration())
912 Named_object
* f
= this->functions_
.back().function
;
913 no
->type_declaration_value()->set_in_function(f
);
918 // Declare a type at the package level.
921 Gogo::declare_package_type(const std::string
& name
, source_location location
)
923 return this->package_
->bindings()->add_type_declaration(name
, NULL
, location
);
926 // Define a type which was already declared.
929 Gogo::define_type(Named_object
* no
, Named_type
* type
)
931 this->current_bindings()->define_type(no
, type
);
937 Gogo::add_variable(const std::string
& name
, Variable
* variable
)
939 Named_object
* no
= this->current_bindings()->add_variable(name
, NULL
,
942 // In a function the middle-end wants to see a DECL_EXPR node.
945 && !no
->var_value()->is_parameter()
946 && !this->functions_
.empty())
947 this->add_statement(Statement::make_variable_declaration(no
));
952 // Add a sink--a reference to the blank identifier _.
957 return Named_object::make_sink();
960 // Add a named object.
963 Gogo::add_named_object(Named_object
* no
)
965 this->current_bindings()->add_named_object(no
);
968 // Record that we've seen an interface type.
971 Gogo::record_interface_type(Interface_type
* itype
)
973 this->interface_types_
.push_back(itype
);
976 // Return a name for a thunk object.
981 static int thunk_count
;
983 snprintf(thunk_name
, sizeof thunk_name
, "$thunk%d", thunk_count
);
988 // Return whether a function is a thunk.
991 Gogo::is_thunk(const Named_object
* no
)
993 return no
->name().compare(0, 6, "$thunk") == 0;
996 // Define the global names. We do this only after parsing all the
997 // input files, because the program might define the global names
1001 Gogo::define_global_names()
1003 for (Bindings::const_declarations_iterator p
=
1004 this->globals_
->begin_declarations();
1005 p
!= this->globals_
->end_declarations();
1008 Named_object
* global_no
= p
->second
;
1009 std::string
name(Gogo::pack_hidden_name(global_no
->name(), false));
1010 Named_object
* no
= this->package_
->bindings()->lookup(name
);
1014 if (no
->is_type_declaration())
1016 if (global_no
->is_type())
1018 if (no
->type_declaration_value()->has_methods())
1019 error_at(no
->location(),
1020 "may not define methods for global type");
1021 no
->set_type_value(global_no
->type_value());
1025 error_at(no
->location(), "expected type");
1026 Type
* errtype
= Type::make_error_type();
1027 Named_object
* err
= Named_object::make_type("error", NULL
,
1030 no
->set_type_value(err
->type_value());
1033 else if (no
->is_unknown())
1034 no
->unknown_value()->set_real_named_object(global_no
);
1038 // Clear out names in file scope.
1041 Gogo::clear_file_scope()
1043 this->package_
->bindings()->clear_file_scope();
1045 // Warn about packages which were imported but not used.
1046 for (Packages::iterator p
= this->packages_
.begin();
1047 p
!= this->packages_
.end();
1050 Package
* package
= p
->second
;
1051 if (package
!= this->package_
1052 && package
->is_imported()
1054 && !package
->uses_sink_alias()
1056 error_at(package
->location(), "imported and not used: %s",
1057 Gogo::message_name(package
->name()).c_str());
1058 package
->clear_is_imported();
1059 package
->clear_uses_sink_alias();
1060 package
->clear_used();
1064 // Traverse the tree.
1067 Gogo::traverse(Traverse
* traverse
)
1069 // Traverse the current package first for consistency. The other
1070 // packages will only contain imported types, constants, and
1072 if (this->package_
->bindings()->traverse(traverse
, true) == TRAVERSE_EXIT
)
1074 for (Packages::const_iterator p
= this->packages_
.begin();
1075 p
!= this->packages_
.end();
1078 if (p
->second
!= this->package_
)
1080 if (p
->second
->bindings()->traverse(traverse
, true) == TRAVERSE_EXIT
)
1086 // Traversal class used to verify types.
1088 class Verify_types
: public Traverse
1092 : Traverse(traverse_types
)
1099 // Verify that a type is correct.
1102 Verify_types::type(Type
* t
)
1104 // Don't verify types defined in other packages.
1105 Named_type
* nt
= t
->named_type();
1106 if (nt
!= NULL
&& nt
->named_object()->package() != NULL
)
1107 return TRAVERSE_SKIP_COMPONENTS
;
1110 return TRAVERSE_SKIP_COMPONENTS
;
1111 return TRAVERSE_CONTINUE
;
1114 // Verify that all types are correct.
1117 Gogo::verify_types()
1119 Verify_types traverse
;
1120 this->traverse(&traverse
);
1123 // Traversal class used to lower parse tree.
1125 class Lower_parse_tree
: public Traverse
1128 Lower_parse_tree(Gogo
* gogo
, Named_object
* function
)
1129 : Traverse(traverse_constants
1130 | traverse_functions
1131 | traverse_statements
1132 | traverse_expressions
),
1133 gogo_(gogo
), function_(function
), iota_value_(-1)
1137 constant(Named_object
*, bool);
1140 function(Named_object
*);
1143 statement(Block
*, size_t* pindex
, Statement
*);
1146 expression(Expression
**);
1151 // The function we are traversing.
1152 Named_object
* function_
;
1153 // Value to use for the predeclared constant iota.
1157 // Lower constants. We handle constants specially so that we can set
1158 // the right value for the predeclared constant iota. This works in
1159 // conjunction with the way we lower Const_expression objects.
1162 Lower_parse_tree::constant(Named_object
* no
, bool)
1164 Named_constant
* nc
= no
->const_value();
1166 // Don't get into trouble if the constant's initializer expression
1167 // refers to the constant itself.
1169 return TRAVERSE_CONTINUE
;
1172 gcc_assert(this->iota_value_
== -1);
1173 this->iota_value_
= nc
->iota_value();
1174 nc
->traverse_expression(this);
1175 this->iota_value_
= -1;
1177 nc
->clear_lowering();
1179 // We will traverse the expression a second time, but that will be
1182 return TRAVERSE_CONTINUE
;
1185 // Lower function closure types. Record the function while lowering
1186 // it, so that we can pass it down when lowering an expression.
1189 Lower_parse_tree::function(Named_object
* no
)
1191 no
->func_value()->set_closure_type();
1193 gcc_assert(this->function_
== NULL
);
1194 this->function_
= no
;
1195 int t
= no
->func_value()->traverse(this);
1196 this->function_
= NULL
;
1198 if (t
== TRAVERSE_EXIT
)
1200 return TRAVERSE_SKIP_COMPONENTS
;
1203 // Lower statement parse trees.
1206 Lower_parse_tree::statement(Block
* block
, size_t* pindex
, Statement
* sorig
)
1208 // Lower the expressions first.
1209 int t
= sorig
->traverse_contents(this);
1210 if (t
== TRAVERSE_EXIT
)
1213 // Keep lowering until nothing changes.
1214 Statement
* s
= sorig
;
1217 Statement
* snew
= s
->lower(this->gogo_
, block
);
1221 t
= s
->traverse_contents(this);
1222 if (t
== TRAVERSE_EXIT
)
1227 block
->replace_statement(*pindex
, s
);
1229 return TRAVERSE_SKIP_COMPONENTS
;
1232 // Lower expression parse trees.
1235 Lower_parse_tree::expression(Expression
** pexpr
)
1237 // We have to lower all subexpressions first, so that we can get
1238 // their type if necessary. This is awkward, because we don't have
1239 // a postorder traversal pass.
1240 if ((*pexpr
)->traverse_subexpressions(this) == TRAVERSE_EXIT
)
1241 return TRAVERSE_EXIT
;
1242 // Keep lowering until nothing changes.
1245 Expression
* e
= *pexpr
;
1246 Expression
* enew
= e
->lower(this->gogo_
, this->function_
,
1252 return TRAVERSE_SKIP_COMPONENTS
;
1255 // Lower the parse tree. This is called after the parse is complete,
1256 // when all names should be resolved.
1259 Gogo::lower_parse_tree()
1261 Lower_parse_tree
lower_parse_tree(this, NULL
);
1262 this->traverse(&lower_parse_tree
);
1265 // Lower an expression.
1268 Gogo::lower_expression(Named_object
* function
, Expression
** pexpr
)
1270 Lower_parse_tree
lower_parse_tree(this, function
);
1271 lower_parse_tree
.expression(pexpr
);
1274 // Lower a constant. This is called when lowering a reference to a
1275 // constant. We have to make sure that the constant has already been
1279 Gogo::lower_constant(Named_object
* no
)
1281 gcc_assert(no
->is_const());
1282 Lower_parse_tree
lower(this, NULL
);
1283 lower
.constant(no
, false);
1286 // Look for interface types to finalize methods of inherited
1289 class Finalize_methods
: public Traverse
1292 Finalize_methods(Gogo
* gogo
)
1293 : Traverse(traverse_types
),
1304 // Finalize the methods of an interface type.
1307 Finalize_methods::type(Type
* t
)
1309 // Check the classification so that we don't finalize the methods
1310 // twice for a named interface type.
1311 switch (t
->classification())
1313 case Type::TYPE_INTERFACE
:
1314 t
->interface_type()->finalize_methods();
1317 case Type::TYPE_NAMED
:
1319 // We have to finalize the methods of the real type first.
1320 // But if the real type is a struct type, then we only want to
1321 // finalize the methods of the field types, not of the struct
1322 // type itself. We don't want to add methods to the struct,
1323 // since it has a name.
1324 Type
* rt
= t
->named_type()->real_type();
1325 if (rt
->classification() != Type::TYPE_STRUCT
)
1327 if (Type::traverse(rt
, this) == TRAVERSE_EXIT
)
1328 return TRAVERSE_EXIT
;
1332 if (rt
->struct_type()->traverse_field_types(this) == TRAVERSE_EXIT
)
1333 return TRAVERSE_EXIT
;
1336 t
->named_type()->finalize_methods(this->gogo_
);
1338 return TRAVERSE_SKIP_COMPONENTS
;
1341 case Type::TYPE_STRUCT
:
1342 t
->struct_type()->finalize_methods(this->gogo_
);
1349 return TRAVERSE_CONTINUE
;
1352 // Finalize method lists and build stub methods for types.
1355 Gogo::finalize_methods()
1357 Finalize_methods
finalize(this);
1358 this->traverse(&finalize
);
1361 // Set types for unspecified variables and constants.
1364 Gogo::determine_types()
1366 Bindings
* bindings
= this->current_bindings();
1367 for (Bindings::const_definitions_iterator p
= bindings
->begin_definitions();
1368 p
!= bindings
->end_definitions();
1371 if ((*p
)->is_function())
1372 (*p
)->func_value()->determine_types();
1373 else if ((*p
)->is_variable())
1374 (*p
)->var_value()->determine_type();
1375 else if ((*p
)->is_const())
1376 (*p
)->const_value()->determine_type();
1378 // See if a variable requires us to build an initialization
1379 // function. We know that we will see all global variables
1381 if (!this->need_init_fn_
&& (*p
)->is_variable())
1383 Variable
* variable
= (*p
)->var_value();
1385 // If this is a global variable which requires runtime
1386 // initialization, we need an initialization function.
1387 if (!variable
->is_global() || variable
->init() == NULL
)
1389 else if (variable
->type()->interface_type() != NULL
)
1390 this->need_init_fn_
= true;
1391 else if (variable
->init()->is_constant())
1393 else if (!variable
->init()->is_composite_literal())
1394 this->need_init_fn_
= true;
1395 else if (variable
->init()->is_nonconstant_composite_literal())
1396 this->need_init_fn_
= true;
1398 // If this is a global variable which holds a pointer value,
1399 // then we need an initialization function to register it as a
1401 if (variable
->is_global() && variable
->type()->has_pointer())
1402 this->need_init_fn_
= true;
1406 // Determine the types of constants in packages.
1407 for (Packages::const_iterator p
= this->packages_
.begin();
1408 p
!= this->packages_
.end();
1410 p
->second
->determine_types();
1413 // Traversal class used for type checking.
1415 class Check_types_traverse
: public Traverse
1418 Check_types_traverse(Gogo
* gogo
)
1419 : Traverse(traverse_variables
1420 | traverse_constants
1421 | traverse_statements
1422 | traverse_expressions
),
1427 variable(Named_object
*);
1430 constant(Named_object
*, bool);
1433 statement(Block
*, size_t* pindex
, Statement
*);
1436 expression(Expression
**);
1443 // Check that a variable initializer has the right type.
1446 Check_types_traverse::variable(Named_object
* named_object
)
1448 if (named_object
->is_variable())
1450 Variable
* var
= named_object
->var_value();
1451 Expression
* init
= var
->init();
1454 && !Type::are_assignable(var
->type(), init
->type(), &reason
))
1457 error_at(var
->location(), "incompatible type in initialization");
1459 error_at(var
->location(),
1460 "incompatible type in initialization (%s)",
1465 return TRAVERSE_CONTINUE
;
1468 // Check that a constant initializer has the right type.
1471 Check_types_traverse::constant(Named_object
* named_object
, bool)
1473 Named_constant
* constant
= named_object
->const_value();
1474 Type
* ctype
= constant
->type();
1475 if (ctype
->integer_type() == NULL
1476 && ctype
->float_type() == NULL
1477 && ctype
->complex_type() == NULL
1478 && !ctype
->is_boolean_type()
1479 && !ctype
->is_string_type())
1481 if (!ctype
->is_error_type())
1482 error_at(constant
->location(), "invalid constant type");
1483 constant
->set_error();
1485 else if (!constant
->expr()->is_constant())
1487 error_at(constant
->expr()->location(), "expression is not constant");
1488 constant
->set_error();
1490 else if (!Type::are_assignable(constant
->type(), constant
->expr()->type(),
1493 error_at(constant
->location(),
1494 "initialization expression has wrong type");
1495 constant
->set_error();
1497 return TRAVERSE_CONTINUE
;
1500 // Check that types are valid in a statement.
1503 Check_types_traverse::statement(Block
*, size_t*, Statement
* s
)
1505 s
->check_types(this->gogo_
);
1506 return TRAVERSE_CONTINUE
;
1509 // Check that types are valid in an expression.
1512 Check_types_traverse::expression(Expression
** expr
)
1514 (*expr
)->check_types(this->gogo_
);
1515 return TRAVERSE_CONTINUE
;
1518 // Check that types are valid.
1523 Check_types_traverse
traverse(this);
1524 this->traverse(&traverse
);
1527 // Check the types in a single block.
1530 Gogo::check_types_in_block(Block
* block
)
1532 Check_types_traverse
traverse(this);
1533 block
->traverse(&traverse
);
1536 // A traversal class used to find a single shortcut operator within an
1539 class Find_shortcut
: public Traverse
1543 : Traverse(traverse_blocks
1544 | traverse_statements
1545 | traverse_expressions
),
1549 // A pointer to the expression which was found, or NULL if none was
1553 { return this->found_
; }
1558 { return TRAVERSE_SKIP_COMPONENTS
; }
1561 statement(Block
*, size_t*, Statement
*)
1562 { return TRAVERSE_SKIP_COMPONENTS
; }
1565 expression(Expression
**);
1568 Expression
** found_
;
1571 // Find a shortcut expression.
1574 Find_shortcut::expression(Expression
** pexpr
)
1576 Expression
* expr
= *pexpr
;
1577 Binary_expression
* be
= expr
->binary_expression();
1579 return TRAVERSE_CONTINUE
;
1580 Operator op
= be
->op();
1581 if (op
!= OPERATOR_OROR
&& op
!= OPERATOR_ANDAND
)
1582 return TRAVERSE_CONTINUE
;
1583 gcc_assert(this->found_
== NULL
);
1584 this->found_
= pexpr
;
1585 return TRAVERSE_EXIT
;
1588 // A traversal class used to turn shortcut operators into explicit if
1591 class Shortcuts
: public Traverse
1595 : Traverse(traverse_variables
1596 | traverse_statements
)
1601 variable(Named_object
*);
1604 statement(Block
*, size_t*, Statement
*);
1607 // Convert a shortcut operator.
1609 convert_shortcut(Block
* enclosing
, Expression
** pshortcut
);
1612 // Remove shortcut operators in a single statement.
1615 Shortcuts::statement(Block
* block
, size_t* pindex
, Statement
* s
)
1617 // FIXME: This approach doesn't work for switch statements, because
1618 // we add the new statements before the whole switch when we need to
1619 // instead add them just before the switch expression. The right
1620 // fix is probably to lower switch statements with nonconstant cases
1621 // to a series of conditionals.
1622 if (s
->switch_statement() != NULL
)
1623 return TRAVERSE_CONTINUE
;
1627 Find_shortcut find_shortcut
;
1629 // If S is a variable declaration, then ordinary traversal won't
1630 // do anything. We want to explicitly traverse the
1631 // initialization expression if there is one.
1632 Variable_declaration_statement
* vds
= s
->variable_declaration_statement();
1633 Expression
* init
= NULL
;
1635 s
->traverse_contents(&find_shortcut
);
1638 init
= vds
->var()->var_value()->init();
1640 return TRAVERSE_CONTINUE
;
1641 init
->traverse(&init
, &find_shortcut
);
1643 Expression
** pshortcut
= find_shortcut
.found();
1644 if (pshortcut
== NULL
)
1645 return TRAVERSE_CONTINUE
;
1647 Statement
* snew
= this->convert_shortcut(block
, pshortcut
);
1648 block
->insert_statement_before(*pindex
, snew
);
1651 if (pshortcut
== &init
)
1652 vds
->var()->var_value()->set_init(init
);
1656 // Remove shortcut operators in the initializer of a global variable.
1659 Shortcuts::variable(Named_object
* no
)
1661 if (no
->is_result_variable())
1662 return TRAVERSE_CONTINUE
;
1663 Variable
* var
= no
->var_value();
1664 Expression
* init
= var
->init();
1665 if (!var
->is_global() || init
== NULL
)
1666 return TRAVERSE_CONTINUE
;
1670 Find_shortcut find_shortcut
;
1671 init
->traverse(&init
, &find_shortcut
);
1672 Expression
** pshortcut
= find_shortcut
.found();
1673 if (pshortcut
== NULL
)
1674 return TRAVERSE_CONTINUE
;
1676 Statement
* snew
= this->convert_shortcut(NULL
, pshortcut
);
1677 var
->add_preinit_statement(snew
);
1678 if (pshortcut
== &init
)
1679 var
->set_init(init
);
1683 // Given an expression which uses a shortcut operator, return a
1684 // statement which implements it, and update *PSHORTCUT accordingly.
1687 Shortcuts::convert_shortcut(Block
* enclosing
, Expression
** pshortcut
)
1689 Binary_expression
* shortcut
= (*pshortcut
)->binary_expression();
1690 Expression
* left
= shortcut
->left();
1691 Expression
* right
= shortcut
->right();
1692 source_location loc
= shortcut
->location();
1694 Block
* retblock
= new Block(enclosing
, loc
);
1695 retblock
->set_end_location(loc
);
1697 Temporary_statement
* ts
= Statement::make_temporary(Type::make_boolean_type(),
1699 retblock
->add_statement(ts
);
1701 Block
* block
= new Block(retblock
, loc
);
1702 block
->set_end_location(loc
);
1703 Expression
* tmpref
= Expression::make_temporary_reference(ts
, loc
);
1704 Statement
* assign
= Statement::make_assignment(tmpref
, right
, loc
);
1705 block
->add_statement(assign
);
1707 Expression
* cond
= Expression::make_temporary_reference(ts
, loc
);
1708 if (shortcut
->binary_expression()->op() == OPERATOR_OROR
)
1709 cond
= Expression::make_unary(OPERATOR_NOT
, cond
, loc
);
1711 Statement
* if_statement
= Statement::make_if_statement(cond
, block
, NULL
,
1713 retblock
->add_statement(if_statement
);
1715 *pshortcut
= Expression::make_temporary_reference(ts
, loc
);
1719 // Now convert any shortcut operators in LEFT and RIGHT.
1720 Shortcuts shortcuts
;
1721 retblock
->traverse(&shortcuts
);
1723 return Statement::make_block_statement(retblock
, loc
);
1726 // Turn shortcut operators into explicit if statements. Doing this
1727 // considerably simplifies the order of evaluation rules.
1730 Gogo::remove_shortcuts()
1732 Shortcuts shortcuts
;
1733 this->traverse(&shortcuts
);
1736 // A traversal class which finds all the expressions which must be
1737 // evaluated in order within a statement or larger expression. This
1738 // is used to implement the rules about order of evaluation.
1740 class Find_eval_ordering
: public Traverse
1743 typedef std::vector
<Expression
**> Expression_pointers
;
1746 Find_eval_ordering()
1747 : Traverse(traverse_blocks
1748 | traverse_statements
1749 | traverse_expressions
),
1755 { return this->exprs_
.size(); }
1757 typedef Expression_pointers::const_iterator const_iterator
;
1761 { return this->exprs_
.begin(); }
1765 { return this->exprs_
.end(); }
1770 { return TRAVERSE_SKIP_COMPONENTS
; }
1773 statement(Block
*, size_t*, Statement
*)
1774 { return TRAVERSE_SKIP_COMPONENTS
; }
1777 expression(Expression
**);
1780 // A list of pointers to expressions with side-effects.
1781 Expression_pointers exprs_
;
1784 // If an expression must be evaluated in order, put it on the list.
1787 Find_eval_ordering::expression(Expression
** expression_pointer
)
1789 // We have to look at subexpressions before this one.
1790 if ((*expression_pointer
)->traverse_subexpressions(this) == TRAVERSE_EXIT
)
1791 return TRAVERSE_EXIT
;
1792 if ((*expression_pointer
)->must_eval_in_order())
1793 this->exprs_
.push_back(expression_pointer
);
1794 return TRAVERSE_SKIP_COMPONENTS
;
1797 // A traversal class for ordering evaluations.
1799 class Order_eval
: public Traverse
1803 : Traverse(traverse_variables
1804 | traverse_statements
)
1808 variable(Named_object
*);
1811 statement(Block
*, size_t*, Statement
*);
1814 // Implement the order of evaluation rules for a statement.
1817 Order_eval::statement(Block
* block
, size_t* pindex
, Statement
* s
)
1819 // FIXME: This approach doesn't work for switch statements, because
1820 // we add the new statements before the whole switch when we need to
1821 // instead add them just before the switch expression. The right
1822 // fix is probably to lower switch statements with nonconstant cases
1823 // to a series of conditionals.
1824 if (s
->switch_statement() != NULL
)
1825 return TRAVERSE_CONTINUE
;
1827 Find_eval_ordering find_eval_ordering
;
1829 // If S is a variable declaration, then ordinary traversal won't do
1830 // anything. We want to explicitly traverse the initialization
1831 // expression if there is one.
1832 Variable_declaration_statement
* vds
= s
->variable_declaration_statement();
1833 Expression
* init
= NULL
;
1834 Expression
* orig_init
= NULL
;
1836 s
->traverse_contents(&find_eval_ordering
);
1839 init
= vds
->var()->var_value()->init();
1841 return TRAVERSE_CONTINUE
;
1844 // It might seem that this could be
1845 // init->traverse_subexpressions. Unfortunately that can fail
1848 // newvar, err := call(arg())
1849 // Here newvar will have an init of call result 0 of
1850 // call(arg()). If we only traverse subexpressions, we will
1851 // only find arg(), and we won't bother to move anything out.
1852 // Then we get to the assignment to err, we will traverse the
1853 // whole statement, and this time we will find both call() and
1854 // arg(), and so we will move them out. This will cause them to
1855 // be put into temporary variables before the assignment to err
1856 // but after the declaration of newvar. To avoid that problem,
1857 // we traverse the entire expression here.
1858 Expression::traverse(&init
, &find_eval_ordering
);
1861 if (find_eval_ordering
.size() <= 1)
1863 // If there is only one expression with a side-effect, we can
1864 // leave it in place.
1865 return TRAVERSE_CONTINUE
;
1868 bool is_thunk
= s
->thunk_statement() != NULL
;
1869 for (Find_eval_ordering::const_iterator p
= find_eval_ordering
.begin();
1870 p
!= find_eval_ordering
.end();
1873 Expression
** pexpr
= *p
;
1875 // If the last expression is a send or receive expression, we
1876 // may be ignoring the value; we don't want to evaluate it
1878 if (p
+ 1 == find_eval_ordering
.end()
1879 && ((*pexpr
)->classification() == Expression::EXPRESSION_SEND
1880 || (*pexpr
)->classification() == Expression::EXPRESSION_RECEIVE
))
1883 // The last expression in a thunk will be the call passed to go
1884 // or defer, which we must not evaluate early.
1885 if (is_thunk
&& p
+ 1 == find_eval_ordering
.end())
1888 source_location loc
= (*pexpr
)->location();
1889 Temporary_statement
* ts
= Statement::make_temporary(NULL
, *pexpr
, loc
);
1890 block
->insert_statement_before(*pindex
, ts
);
1893 *pexpr
= Expression::make_temporary_reference(ts
, loc
);
1896 if (init
!= orig_init
)
1897 vds
->var()->var_value()->set_init(init
);
1899 return TRAVERSE_CONTINUE
;
1902 // Implement the order of evaluation rules for the initializer of a
1906 Order_eval::variable(Named_object
* no
)
1908 if (no
->is_result_variable())
1909 return TRAVERSE_CONTINUE
;
1910 Variable
* var
= no
->var_value();
1911 Expression
* init
= var
->init();
1912 if (!var
->is_global() || init
== NULL
)
1913 return TRAVERSE_CONTINUE
;
1915 Find_eval_ordering find_eval_ordering
;
1916 init
->traverse_subexpressions(&find_eval_ordering
);
1918 if (find_eval_ordering
.size() <= 1)
1920 // If there is only one expression with a side-effect, we can
1921 // leave it in place.
1922 return TRAVERSE_SKIP_COMPONENTS
;
1925 for (Find_eval_ordering::const_iterator p
= find_eval_ordering
.begin();
1926 p
!= find_eval_ordering
.end();
1929 Expression
** pexpr
= *p
;
1930 source_location loc
= (*pexpr
)->location();
1931 Temporary_statement
* ts
= Statement::make_temporary(NULL
, *pexpr
, loc
);
1932 var
->add_preinit_statement(ts
);
1933 *pexpr
= Expression::make_temporary_reference(ts
, loc
);
1936 return TRAVERSE_SKIP_COMPONENTS
;
1939 // Use temporary variables to implement the order of evaluation rules.
1942 Gogo::order_evaluations()
1944 Order_eval order_eval
;
1945 this->traverse(&order_eval
);
1948 // Traversal to convert calls to the predeclared recover function to
1949 // pass in an argument indicating whether it can recover from a panic
1952 class Convert_recover
: public Traverse
1955 Convert_recover(Named_object
* arg
)
1956 : Traverse(traverse_expressions
),
1962 expression(Expression
**);
1965 // The argument to pass to the function.
1969 // Convert calls to recover.
1972 Convert_recover::expression(Expression
** pp
)
1974 Call_expression
* ce
= (*pp
)->call_expression();
1975 if (ce
!= NULL
&& ce
->is_recover_call())
1976 ce
->set_recover_arg(Expression::make_var_reference(this->arg_
,
1978 return TRAVERSE_CONTINUE
;
1981 // Traversal for build_recover_thunks.
1983 class Build_recover_thunks
: public Traverse
1986 Build_recover_thunks(Gogo
* gogo
)
1987 : Traverse(traverse_functions
),
1992 function(Named_object
*);
1996 can_recover_arg(source_location
);
2002 // If this function calls recover, turn it into a thunk.
2005 Build_recover_thunks::function(Named_object
* orig_no
)
2007 Function
* orig_func
= orig_no
->func_value();
2008 if (!orig_func
->calls_recover()
2009 || orig_func
->is_recover_thunk()
2010 || orig_func
->has_recover_thunk())
2011 return TRAVERSE_CONTINUE
;
2013 Gogo
* gogo
= this->gogo_
;
2014 source_location location
= orig_func
->location();
2019 Function_type
* orig_fntype
= orig_func
->type();
2020 Typed_identifier_list
* new_params
= new Typed_identifier_list();
2021 std::string receiver_name
;
2022 if (orig_fntype
->is_method())
2024 const Typed_identifier
* receiver
= orig_fntype
->receiver();
2025 snprintf(buf
, sizeof buf
, "rt.%u", count
);
2027 receiver_name
= buf
;
2028 new_params
->push_back(Typed_identifier(receiver_name
, receiver
->type(),
2029 receiver
->location()));
2031 const Typed_identifier_list
* orig_params
= orig_fntype
->parameters();
2032 if (orig_params
!= NULL
&& !orig_params
->empty())
2034 for (Typed_identifier_list::const_iterator p
= orig_params
->begin();
2035 p
!= orig_params
->end();
2038 snprintf(buf
, sizeof buf
, "pt.%u", count
);
2040 new_params
->push_back(Typed_identifier(buf
, p
->type(),
2044 snprintf(buf
, sizeof buf
, "pr.%u", count
);
2046 std::string can_recover_name
= buf
;
2047 new_params
->push_back(Typed_identifier(can_recover_name
,
2048 Type::make_boolean_type(),
2049 orig_fntype
->location()));
2051 const Typed_identifier_list
* orig_results
= orig_fntype
->results();
2052 Typed_identifier_list
* new_results
;
2053 if (orig_results
== NULL
|| orig_results
->empty())
2057 new_results
= new Typed_identifier_list();
2058 for (Typed_identifier_list::const_iterator p
= orig_results
->begin();
2059 p
!= orig_results
->end();
2061 new_results
->push_back(*p
);
2064 Function_type
*new_fntype
= Type::make_function_type(NULL
, new_params
,
2066 orig_fntype
->location());
2067 if (orig_fntype
->is_varargs())
2068 new_fntype
->set_is_varargs();
2070 std::string name
= orig_no
->name() + "$recover";
2071 Named_object
*new_no
= gogo
->start_function(name
, new_fntype
, false,
2073 Function
*new_func
= new_no
->func_value();
2074 if (orig_func
->enclosing() != NULL
)
2075 new_func
->set_enclosing(orig_func
->enclosing());
2077 // We build the code for the original function attached to the new
2078 // function, and then swap the original and new function bodies.
2079 // This means that existing references to the original function will
2080 // then refer to the new function. That makes this code a little
2081 // confusing, in that the reference to NEW_NO really refers to the
2082 // other function, not the one we are building.
2084 Expression
* closure
= NULL
;
2085 if (orig_func
->needs_closure())
2087 Named_object
* orig_closure_no
= orig_func
->closure_var();
2088 Variable
* orig_closure_var
= orig_closure_no
->var_value();
2089 Variable
* new_var
= new Variable(orig_closure_var
->type(), NULL
, false,
2090 true, false, location
);
2091 snprintf(buf
, sizeof buf
, "closure.%u", count
);
2093 Named_object
* new_closure_no
= Named_object::make_variable(buf
, NULL
,
2095 new_func
->set_closure_var(new_closure_no
);
2096 closure
= Expression::make_var_reference(new_closure_no
, location
);
2099 Expression
* fn
= Expression::make_func_reference(new_no
, closure
, location
);
2101 Expression_list
* args
= new Expression_list();
2102 if (new_params
!= NULL
)
2104 // Note that we skip the last parameter, which is the boolean
2105 // indicating whether recover can succed.
2106 for (Typed_identifier_list::const_iterator p
= new_params
->begin();
2107 p
+ 1 != new_params
->end();
2110 Named_object
* p_no
= gogo
->lookup(p
->name(), NULL
);
2111 gcc_assert(p_no
!= NULL
2112 && p_no
->is_variable()
2113 && p_no
->var_value()->is_parameter());
2114 args
->push_back(Expression::make_var_reference(p_no
, location
));
2117 args
->push_back(this->can_recover_arg(location
));
2119 Expression
* call
= Expression::make_call(fn
, args
, false, location
);
2122 if (orig_fntype
->results() == NULL
|| orig_fntype
->results()->empty())
2123 s
= Statement::make_statement(call
);
2126 Expression_list
* vals
= new Expression_list();
2127 vals
->push_back(call
);
2128 s
= Statement::make_return_statement(new_func
->type()->results(),
2131 s
->determine_types();
2132 gogo
->add_statement(s
);
2134 gogo
->finish_function(location
);
2136 // Swap the function bodies and types.
2137 new_func
->swap_for_recover(orig_func
);
2138 orig_func
->set_is_recover_thunk();
2139 new_func
->set_calls_recover();
2140 new_func
->set_has_recover_thunk();
2142 Bindings
* orig_bindings
= orig_func
->block()->bindings();
2143 Bindings
* new_bindings
= new_func
->block()->bindings();
2144 if (orig_fntype
->is_method())
2146 // We changed the receiver to be a regular parameter. We have
2147 // to update the binding accordingly in both functions.
2148 Named_object
* orig_rec_no
= orig_bindings
->lookup_local(receiver_name
);
2149 gcc_assert(orig_rec_no
!= NULL
2150 && orig_rec_no
->is_variable()
2151 && !orig_rec_no
->var_value()->is_receiver());
2152 orig_rec_no
->var_value()->set_is_receiver();
2154 const std::string
& new_receiver_name(orig_fntype
->receiver()->name());
2155 Named_object
* new_rec_no
= new_bindings
->lookup_local(new_receiver_name
);
2156 gcc_assert(new_rec_no
!= NULL
2157 && new_rec_no
->is_variable()
2158 && new_rec_no
->var_value()->is_receiver());
2159 new_rec_no
->var_value()->set_is_not_receiver();
2162 // Because we flipped blocks but not types, the can_recover
2163 // parameter appears in the (now) old bindings as a parameter.
2164 // Change it to a local variable, whereupon it will be discarded.
2165 Named_object
* can_recover_no
= orig_bindings
->lookup_local(can_recover_name
);
2166 gcc_assert(can_recover_no
!= NULL
2167 && can_recover_no
->is_variable()
2168 && can_recover_no
->var_value()->is_parameter());
2169 orig_bindings
->remove_binding(can_recover_no
);
2171 // Add the can_recover argument to the (now) new bindings, and
2172 // attach it to any recover statements.
2173 Variable
* can_recover_var
= new Variable(Type::make_boolean_type(), NULL
,
2174 false, true, false, location
);
2175 can_recover_no
= new_bindings
->add_variable(can_recover_name
, NULL
,
2177 Convert_recover
convert_recover(can_recover_no
);
2178 new_func
->traverse(&convert_recover
);
2180 // Update the function pointers in any named results.
2181 new_func
->update_named_result_variables();
2182 orig_func
->update_named_result_variables();
2184 return TRAVERSE_CONTINUE
;
2187 // Return the expression to pass for the .can_recover parameter to the
2188 // new function. This indicates whether a call to recover may return
2189 // non-nil. The expression is
2190 // __go_can_recover(__builtin_return_address()).
2193 Build_recover_thunks::can_recover_arg(source_location location
)
2195 static Named_object
* builtin_return_address
;
2196 if (builtin_return_address
== NULL
)
2198 const source_location bloc
= BUILTINS_LOCATION
;
2200 Typed_identifier_list
* param_types
= new Typed_identifier_list();
2201 Type
* uint_type
= Type::lookup_integer_type("uint");
2202 param_types
->push_back(Typed_identifier("l", uint_type
, bloc
));
2204 Typed_identifier_list
* return_types
= new Typed_identifier_list();
2205 Type
* voidptr_type
= Type::make_pointer_type(Type::make_void_type());
2206 return_types
->push_back(Typed_identifier("", voidptr_type
, bloc
));
2208 Function_type
* fntype
= Type::make_function_type(NULL
, param_types
,
2209 return_types
, bloc
);
2210 builtin_return_address
=
2211 Named_object::make_function_declaration("__builtin_return_address",
2212 NULL
, fntype
, bloc
);
2213 const char* n
= "__builtin_return_address";
2214 builtin_return_address
->func_declaration_value()->set_asm_name(n
);
2217 static Named_object
* can_recover
;
2218 if (can_recover
== NULL
)
2220 const source_location bloc
= BUILTINS_LOCATION
;
2221 Typed_identifier_list
* param_types
= new Typed_identifier_list();
2222 Type
* voidptr_type
= Type::make_pointer_type(Type::make_void_type());
2223 param_types
->push_back(Typed_identifier("a", voidptr_type
, bloc
));
2224 Type
* boolean_type
= Type::make_boolean_type();
2225 Typed_identifier_list
* results
= new Typed_identifier_list();
2226 results
->push_back(Typed_identifier("", boolean_type
, bloc
));
2227 Function_type
* fntype
= Type::make_function_type(NULL
, param_types
,
2229 can_recover
= Named_object::make_function_declaration("__go_can_recover",
2232 can_recover
->func_declaration_value()->set_asm_name("__go_can_recover");
2235 Expression
* fn
= Expression::make_func_reference(builtin_return_address
,
2239 mpz_init_set_ui(zval
, 0UL);
2240 Expression
* zexpr
= Expression::make_integer(&zval
, NULL
, location
);
2242 Expression_list
*args
= new Expression_list();
2243 args
->push_back(zexpr
);
2245 Expression
* call
= Expression::make_call(fn
, args
, false, location
);
2247 args
= new Expression_list();
2248 args
->push_back(call
);
2250 fn
= Expression::make_func_reference(can_recover
, NULL
, location
);
2251 return Expression::make_call(fn
, args
, false, location
);
2254 // Build thunks for functions which call recover. We build a new
2255 // function with an extra parameter, which is whether a call to
2256 // recover can succeed. We then move the body of this function to
2257 // that one. We then turn this function into a thunk which calls the
2258 // new one, passing the value of
2259 // __go_can_recover(__builtin_return_address()). The function will be
2260 // marked as not splitting the stack. This will cooperate with the
2261 // implementation of defer to make recover do the right thing.
2264 Gogo::build_recover_thunks()
2266 Build_recover_thunks
build_recover_thunks(this);
2267 this->traverse(&build_recover_thunks
);
2270 // Look for named types to see whether we need to create an interface
2273 class Build_method_tables
: public Traverse
2276 Build_method_tables(Gogo
* gogo
,
2277 const std::vector
<Interface_type
*>& interfaces
)
2278 : Traverse(traverse_types
),
2279 gogo_(gogo
), interfaces_(interfaces
)
2288 // A list of locally defined interfaces which have hidden methods.
2289 const std::vector
<Interface_type
*>& interfaces_
;
2292 // Build all required interface method tables for types. We need to
2293 // ensure that we have an interface method table for every interface
2294 // which has a hidden method, for every named type which implements
2295 // that interface. Normally we can just build interface method tables
2296 // as we need them. However, in some cases we can require an
2297 // interface method table for an interface defined in a different
2298 // package for a type defined in that package. If that interface and
2299 // type both use a hidden method, that is OK. However, we will not be
2300 // able to build that interface method table when we need it, because
2301 // the type's hidden method will be static. So we have to build it
2302 // here, and just refer it from other packages as needed.
2305 Gogo::build_interface_method_tables()
2307 std::vector
<Interface_type
*> hidden_interfaces
;
2308 hidden_interfaces
.reserve(this->interface_types_
.size());
2309 for (std::vector
<Interface_type
*>::const_iterator pi
=
2310 this->interface_types_
.begin();
2311 pi
!= this->interface_types_
.end();
2314 const Typed_identifier_list
* methods
= (*pi
)->methods();
2315 if (methods
== NULL
)
2317 for (Typed_identifier_list::const_iterator pm
= methods
->begin();
2318 pm
!= methods
->end();
2321 if (Gogo::is_hidden_name(pm
->name()))
2323 hidden_interfaces
.push_back(*pi
);
2329 if (!hidden_interfaces
.empty())
2331 // Now traverse the tree looking for all named types.
2332 Build_method_tables
bmt(this, hidden_interfaces
);
2333 this->traverse(&bmt
);
2336 // We no longer need the list of interfaces.
2338 this->interface_types_
.clear();
2341 // This is called for each type. For a named type, for each of the
2342 // interfaces with hidden methods that it implements, create the
2346 Build_method_tables::type(Type
* type
)
2348 Named_type
* nt
= type
->named_type();
2351 for (std::vector
<Interface_type
*>::const_iterator p
=
2352 this->interfaces_
.begin();
2353 p
!= this->interfaces_
.end();
2356 // We ask whether a pointer to the named type implements the
2357 // interface, because a pointer can implement more methods
2359 if ((*p
)->implements_interface(Type::make_pointer_type(nt
), NULL
))
2361 nt
->interface_method_table(this->gogo_
, *p
, false);
2362 nt
->interface_method_table(this->gogo_
, *p
, true);
2366 return TRAVERSE_CONTINUE
;
2369 // Traversal class used to check for return statements.
2371 class Check_return_statements_traverse
: public Traverse
2374 Check_return_statements_traverse()
2375 : Traverse(traverse_functions
)
2379 function(Named_object
*);
2382 // Check that a function has a return statement if it needs one.
2385 Check_return_statements_traverse::function(Named_object
* no
)
2387 Function
* func
= no
->func_value();
2388 const Function_type
* fntype
= func
->type();
2389 const Typed_identifier_list
* results
= fntype
->results();
2391 // We only need a return statement if there is a return value.
2392 if (results
== NULL
|| results
->empty())
2393 return TRAVERSE_CONTINUE
;
2395 if (func
->block()->may_fall_through())
2396 error_at(func
->location(), "control reaches end of non-void function");
2398 return TRAVERSE_CONTINUE
;
2401 // Check return statements.
2404 Gogo::check_return_statements()
2406 Check_return_statements_traverse traverse
;
2407 this->traverse(&traverse
);
2410 // Get the unique prefix to use before all exported symbols. This
2411 // must be unique across the entire link.
2414 Gogo::unique_prefix() const
2416 gcc_assert(!this->unique_prefix_
.empty());
2417 return this->unique_prefix_
;
2420 // Set the unique prefix to use before all exported symbols. This
2421 // comes from the command line option -fgo-prefix=XXX.
2424 Gogo::set_unique_prefix(const std::string
& arg
)
2426 gcc_assert(this->unique_prefix_
.empty());
2427 this->unique_prefix_
= arg
;
2430 // Work out the package priority. It is one more than the maximum
2431 // priority of an imported package.
2434 Gogo::package_priority() const
2437 for (Packages::const_iterator p
= this->packages_
.begin();
2438 p
!= this->packages_
.end();
2440 if (p
->second
->priority() > priority
)
2441 priority
= p
->second
->priority();
2442 return priority
+ 1;
2445 // Export identifiers as requested.
2450 // For now we always stream to a section. Later we may want to
2451 // support streaming to a separate file.
2452 Stream_to_section stream
;
2454 Export
exp(&stream
);
2455 exp
.register_builtin_types(this);
2456 exp
.export_globals(this->package_name(),
2457 this->unique_prefix(),
2458 this->package_priority(),
2459 (this->need_init_fn_
&& this->package_name() != "main"
2460 ? this->get_init_fn_name()
2462 this->imported_init_fns_
,
2463 this->package_
->bindings());
2468 Function::Function(Function_type
* type
, Function
* enclosing
, Block
* block
,
2469 source_location location
)
2470 : type_(type
), enclosing_(enclosing
), named_results_(NULL
),
2471 closure_var_(NULL
), block_(block
), location_(location
), fndecl_(NULL
),
2472 defer_stack_(NULL
), calls_recover_(false), is_recover_thunk_(false),
2473 has_recover_thunk_(false)
2477 // Create the named result variables.
2480 Function::create_named_result_variables(Gogo
* gogo
)
2482 const Typed_identifier_list
* results
= this->type_
->results();
2485 || results
->front().name().empty())
2488 this->named_results_
= new Named_results();
2489 this->named_results_
->reserve(results
->size());
2491 Block
* block
= this->block_
;
2493 for (Typed_identifier_list::const_iterator p
= results
->begin();
2494 p
!= results
->end();
2497 std::string name
= p
->name();
2498 if (Gogo::is_sink_name(name
))
2500 static int unnamed_result_counter
;
2502 snprintf(buf
, sizeof buf
, "_$%d", unnamed_result_counter
);
2503 ++unnamed_result_counter
;
2504 name
= gogo
->pack_hidden_name(buf
, false);
2506 Result_variable
* result
= new Result_variable(p
->type(), this, index
);
2507 Named_object
* no
= block
->bindings()->add_result_variable(name
, result
);
2508 this->named_results_
->push_back(no
);
2512 // Update the named result variables when cloning a function which
2516 Function::update_named_result_variables()
2518 if (this->named_results_
== NULL
)
2521 for (Named_results::iterator p
= this->named_results_
->begin();
2522 p
!= this->named_results_
->end();
2524 (*p
)->result_var_value()->set_function(this);
2527 // Return the closure variable, creating it if necessary.
2530 Function::closure_var()
2532 if (this->closure_var_
== NULL
)
2534 // We don't know the type of the variable yet. We add fields as
2536 source_location loc
= this->type_
->location();
2537 Struct_field_list
* sfl
= new Struct_field_list
;
2538 Type
* struct_type
= Type::make_struct_type(sfl
, loc
);
2539 Variable
* var
= new Variable(Type::make_pointer_type(struct_type
),
2540 NULL
, false, true, false, loc
);
2541 this->closure_var_
= Named_object::make_variable("closure", NULL
, var
);
2542 // Note that the new variable is not in any binding contour.
2544 return this->closure_var_
;
2547 // Set the type of the closure variable.
2550 Function::set_closure_type()
2552 if (this->closure_var_
== NULL
)
2554 Named_object
* closure
= this->closure_var_
;
2555 Struct_type
* st
= closure
->var_value()->type()->deref()->struct_type();
2556 unsigned int index
= 0;
2557 for (Closure_fields::const_iterator p
= this->closure_fields_
.begin();
2558 p
!= this->closure_fields_
.end();
2561 Named_object
* no
= p
->first
;
2563 snprintf(buf
, sizeof buf
, "%u", index
);
2564 std::string n
= no
->name() + buf
;
2566 if (no
->is_variable())
2567 var_type
= no
->var_value()->type();
2569 var_type
= no
->result_var_value()->type();
2570 Type
* field_type
= Type::make_pointer_type(var_type
);
2571 st
->push_field(Struct_field(Typed_identifier(n
, field_type
, p
->second
)));
2575 // Return whether this function is a method.
2578 Function::is_method() const
2580 return this->type_
->is_method();
2583 // Add a label definition.
2586 Function::add_label_definition(const std::string
& label_name
,
2587 source_location location
)
2589 Label
* lnull
= NULL
;
2590 std::pair
<Labels::iterator
, bool> ins
=
2591 this->labels_
.insert(std::make_pair(label_name
, lnull
));
2594 // This is a new label.
2595 Label
* label
= new Label(label_name
);
2596 label
->define(location
);
2597 ins
.first
->second
= label
;
2602 // The label was already in the hash table.
2603 Label
* label
= ins
.first
->second
;
2604 if (!label
->is_defined())
2606 label
->define(location
);
2611 error_at(location
, "redefinition of label %qs",
2612 Gogo::message_name(label_name
).c_str());
2613 inform(label
->location(), "previous definition of %qs was here",
2614 Gogo::message_name(label_name
).c_str());
2615 return new Label(label_name
);
2620 // Add a reference to a label.
2623 Function::add_label_reference(const std::string
& label_name
)
2625 Label
* lnull
= NULL
;
2626 std::pair
<Labels::iterator
, bool> ins
=
2627 this->labels_
.insert(std::make_pair(label_name
, lnull
));
2630 // The label was already in the hash table.
2631 return ins
.first
->second
;
2635 gcc_assert(ins
.first
->second
== NULL
);
2636 Label
* label
= new Label(label_name
);
2637 ins
.first
->second
= label
;
2642 // Swap one function with another. This is used when building the
2643 // thunk we use to call a function which calls recover. It may not
2644 // work for any other case.
2647 Function::swap_for_recover(Function
*x
)
2649 gcc_assert(this->enclosing_
== x
->enclosing_
);
2650 std::swap(this->named_results_
, x
->named_results_
);
2651 std::swap(this->closure_var_
, x
->closure_var_
);
2652 std::swap(this->block_
, x
->block_
);
2653 gcc_assert(this->location_
== x
->location_
);
2654 gcc_assert(this->fndecl_
== NULL
&& x
->fndecl_
== NULL
);
2655 gcc_assert(this->defer_stack_
== NULL
&& x
->defer_stack_
== NULL
);
2658 // Traverse the tree.
2661 Function::traverse(Traverse
* traverse
)
2663 unsigned int traverse_mask
= traverse
->traverse_mask();
2666 & (Traverse::traverse_types
| Traverse::traverse_expressions
))
2669 if (Type::traverse(this->type_
, traverse
) == TRAVERSE_EXIT
)
2670 return TRAVERSE_EXIT
;
2673 // FIXME: We should check traverse_functions here if nested
2674 // functions are stored in block bindings.
2675 if (this->block_
!= NULL
2677 & (Traverse::traverse_variables
2678 | Traverse::traverse_constants
2679 | Traverse::traverse_blocks
2680 | Traverse::traverse_statements
2681 | Traverse::traverse_expressions
2682 | Traverse::traverse_types
)) != 0)
2684 if (this->block_
->traverse(traverse
) == TRAVERSE_EXIT
)
2685 return TRAVERSE_EXIT
;
2688 return TRAVERSE_CONTINUE
;
2691 // Work out types for unspecified variables and constants.
2694 Function::determine_types()
2696 if (this->block_
!= NULL
)
2697 this->block_
->determine_types();
2700 // Export the function.
2703 Function::export_func(Export
* exp
, const std::string
& name
) const
2705 Function::export_func_with_type(exp
, name
, this->type_
);
2708 // Export a function with a type.
2711 Function::export_func_with_type(Export
* exp
, const std::string
& name
,
2712 const Function_type
* fntype
)
2714 exp
->write_c_string("func ");
2716 if (fntype
->is_method())
2718 exp
->write_c_string("(");
2719 exp
->write_type(fntype
->receiver()->type());
2720 exp
->write_c_string(") ");
2723 exp
->write_string(name
);
2725 exp
->write_c_string(" (");
2726 const Typed_identifier_list
* parameters
= fntype
->parameters();
2727 if (parameters
!= NULL
)
2729 bool is_varargs
= fntype
->is_varargs();
2731 for (Typed_identifier_list::const_iterator p
= parameters
->begin();
2732 p
!= parameters
->end();
2738 exp
->write_c_string(", ");
2739 if (!is_varargs
|| p
+ 1 != parameters
->end())
2740 exp
->write_type(p
->type());
2743 exp
->write_c_string("...");
2744 exp
->write_type(p
->type()->array_type()->element_type());
2748 exp
->write_c_string(")");
2750 const Typed_identifier_list
* results
= fntype
->results();
2751 if (results
!= NULL
)
2753 if (results
->size() == 1)
2755 exp
->write_c_string(" ");
2756 exp
->write_type(results
->begin()->type());
2760 exp
->write_c_string(" (");
2762 for (Typed_identifier_list::const_iterator p
= results
->begin();
2763 p
!= results
->end();
2769 exp
->write_c_string(", ");
2770 exp
->write_type(p
->type());
2772 exp
->write_c_string(")");
2775 exp
->write_c_string(";\n");
2778 // Import a function.
2781 Function::import_func(Import
* imp
, std::string
* pname
,
2782 Typed_identifier
** preceiver
,
2783 Typed_identifier_list
** pparameters
,
2784 Typed_identifier_list
** presults
,
2787 imp
->require_c_string("func ");
2790 if (imp
->peek_char() == '(')
2792 imp
->require_c_string("(");
2793 Type
* rtype
= imp
->read_type();
2794 *preceiver
= new Typed_identifier(Import::import_marker
, rtype
,
2796 imp
->require_c_string(") ");
2799 *pname
= imp
->read_identifier();
2801 Typed_identifier_list
* parameters
;
2802 *is_varargs
= false;
2803 imp
->require_c_string(" (");
2804 if (imp
->peek_char() == ')')
2808 parameters
= new Typed_identifier_list();
2811 if (imp
->match_c_string("..."))
2817 Type
* ptype
= imp
->read_type();
2819 ptype
= Type::make_array_type(ptype
, NULL
);
2820 parameters
->push_back(Typed_identifier(Import::import_marker
,
2821 ptype
, imp
->location()));
2822 if (imp
->peek_char() != ',')
2824 gcc_assert(!*is_varargs
);
2825 imp
->require_c_string(", ");
2828 imp
->require_c_string(")");
2829 *pparameters
= parameters
;
2831 Typed_identifier_list
* results
;
2832 if (imp
->peek_char() != ' ')
2836 results
= new Typed_identifier_list();
2837 imp
->require_c_string(" ");
2838 if (imp
->peek_char() != '(')
2840 Type
* rtype
= imp
->read_type();
2841 results
->push_back(Typed_identifier(Import::import_marker
, rtype
,
2846 imp
->require_c_string("(");
2849 Type
* rtype
= imp
->read_type();
2850 results
->push_back(Typed_identifier(Import::import_marker
,
2851 rtype
, imp
->location()));
2852 if (imp
->peek_char() != ',')
2854 imp
->require_c_string(", ");
2856 imp
->require_c_string(")");
2859 imp
->require_c_string(";\n");
2860 *presults
= results
;
2865 Block::Block(Block
* enclosing
, source_location location
)
2866 : enclosing_(enclosing
), statements_(),
2867 bindings_(new Bindings(enclosing
== NULL
2869 : enclosing
->bindings())),
2870 start_location_(location
),
2871 end_location_(UNKNOWN_LOCATION
)
2875 // Add a statement to a block.
2878 Block::add_statement(Statement
* statement
)
2880 this->statements_
.push_back(statement
);
2883 // Add a statement to the front of a block. This is slow but is only
2884 // used for reference counts of parameters.
2887 Block::add_statement_at_front(Statement
* statement
)
2889 this->statements_
.insert(this->statements_
.begin(), statement
);
2892 // Replace a statement in a block.
2895 Block::replace_statement(size_t index
, Statement
* s
)
2897 gcc_assert(index
< this->statements_
.size());
2898 this->statements_
[index
] = s
;
2901 // Add a statement before another statement.
2904 Block::insert_statement_before(size_t index
, Statement
* s
)
2906 gcc_assert(index
< this->statements_
.size());
2907 this->statements_
.insert(this->statements_
.begin() + index
, s
);
2910 // Add a statement after another statement.
2913 Block::insert_statement_after(size_t index
, Statement
* s
)
2915 gcc_assert(index
< this->statements_
.size());
2916 this->statements_
.insert(this->statements_
.begin() + index
+ 1, s
);
2919 // Traverse the tree.
2922 Block::traverse(Traverse
* traverse
)
2924 unsigned int traverse_mask
= traverse
->traverse_mask();
2926 if ((traverse_mask
& Traverse::traverse_blocks
) != 0)
2928 int t
= traverse
->block(this);
2929 if (t
== TRAVERSE_EXIT
)
2930 return TRAVERSE_EXIT
;
2931 else if (t
== TRAVERSE_SKIP_COMPONENTS
)
2932 return TRAVERSE_CONTINUE
;
2936 & (Traverse::traverse_variables
2937 | Traverse::traverse_constants
2938 | Traverse::traverse_expressions
2939 | Traverse::traverse_types
)) != 0)
2941 for (Bindings::const_definitions_iterator pb
=
2942 this->bindings_
->begin_definitions();
2943 pb
!= this->bindings_
->end_definitions();
2946 switch ((*pb
)->classification())
2948 case Named_object::NAMED_OBJECT_CONST
:
2949 if ((traverse_mask
& Traverse::traverse_constants
) != 0)
2951 if (traverse
->constant(*pb
, false) == TRAVERSE_EXIT
)
2952 return TRAVERSE_EXIT
;
2954 if ((traverse_mask
& Traverse::traverse_types
) != 0
2955 || (traverse_mask
& Traverse::traverse_expressions
) != 0)
2957 Type
* t
= (*pb
)->const_value()->type();
2959 && Type::traverse(t
, traverse
) == TRAVERSE_EXIT
)
2960 return TRAVERSE_EXIT
;
2962 if ((traverse_mask
& Traverse::traverse_expressions
) != 0
2963 || (traverse_mask
& Traverse::traverse_types
) != 0)
2965 if ((*pb
)->const_value()->traverse_expression(traverse
)
2967 return TRAVERSE_EXIT
;
2971 case Named_object::NAMED_OBJECT_VAR
:
2972 case Named_object::NAMED_OBJECT_RESULT_VAR
:
2973 if ((traverse_mask
& Traverse::traverse_variables
) != 0)
2975 if (traverse
->variable(*pb
) == TRAVERSE_EXIT
)
2976 return TRAVERSE_EXIT
;
2978 if (((traverse_mask
& Traverse::traverse_types
) != 0
2979 || (traverse_mask
& Traverse::traverse_expressions
) != 0)
2980 && ((*pb
)->is_result_variable()
2981 || (*pb
)->var_value()->has_type()))
2983 Type
* t
= ((*pb
)->is_variable()
2984 ? (*pb
)->var_value()->type()
2985 : (*pb
)->result_var_value()->type());
2987 && Type::traverse(t
, traverse
) == TRAVERSE_EXIT
)
2988 return TRAVERSE_EXIT
;
2990 if ((*pb
)->is_variable()
2991 && ((traverse_mask
& Traverse::traverse_expressions
) != 0
2992 || (traverse_mask
& Traverse::traverse_types
) != 0))
2994 if ((*pb
)->var_value()->traverse_expression(traverse
)
2996 return TRAVERSE_EXIT
;
3000 case Named_object::NAMED_OBJECT_FUNC
:
3001 case Named_object::NAMED_OBJECT_FUNC_DECLARATION
:
3002 // FIXME: Where will nested functions be found?
3005 case Named_object::NAMED_OBJECT_TYPE
:
3006 if ((traverse_mask
& Traverse::traverse_types
) != 0
3007 || (traverse_mask
& Traverse::traverse_expressions
) != 0)
3009 if (Type::traverse((*pb
)->type_value(), traverse
)
3011 return TRAVERSE_EXIT
;
3015 case Named_object::NAMED_OBJECT_TYPE_DECLARATION
:
3016 case Named_object::NAMED_OBJECT_UNKNOWN
:
3019 case Named_object::NAMED_OBJECT_PACKAGE
:
3020 case Named_object::NAMED_OBJECT_SINK
:
3029 // No point in checking traverse_mask here--if we got here we always
3030 // want to walk the statements. The traversal can insert new
3031 // statements before or after the current statement. Inserting
3032 // statements before the current statement requires updating I via
3033 // the pointer; those statements will not be traversed. Any new
3034 // statements inserted after the current statement will be traversed
3036 for (size_t i
= 0; i
< this->statements_
.size(); ++i
)
3038 if (this->statements_
[i
]->traverse(this, &i
, traverse
) == TRAVERSE_EXIT
)
3039 return TRAVERSE_EXIT
;
3042 return TRAVERSE_CONTINUE
;
3045 // Work out types for unspecified variables and constants.
3048 Block::determine_types()
3050 for (Bindings::const_definitions_iterator pb
=
3051 this->bindings_
->begin_definitions();
3052 pb
!= this->bindings_
->end_definitions();
3055 if ((*pb
)->is_variable())
3056 (*pb
)->var_value()->determine_type();
3057 else if ((*pb
)->is_const())
3058 (*pb
)->const_value()->determine_type();
3061 for (std::vector
<Statement
*>::const_iterator ps
= this->statements_
.begin();
3062 ps
!= this->statements_
.end();
3064 (*ps
)->determine_types();
3067 // Return true if the statements in this block may fall through.
3070 Block::may_fall_through() const
3072 if (this->statements_
.empty())
3074 return this->statements_
.back()->may_fall_through();
3079 Variable::Variable(Type
* type
, Expression
* init
, bool is_global
,
3080 bool is_parameter
, bool is_receiver
,
3081 source_location location
)
3082 : type_(type
), init_(init
), preinit_(NULL
), location_(location
),
3083 is_global_(is_global
), is_parameter_(is_parameter
),
3084 is_receiver_(is_receiver
), is_varargs_parameter_(false),
3085 is_address_taken_(false), seen_(false), init_is_lowered_(false),
3086 type_from_init_tuple_(false), type_from_range_index_(false),
3087 type_from_range_value_(false), type_from_chan_element_(false),
3088 is_type_switch_var_(false)
3090 gcc_assert(type
!= NULL
|| init
!= NULL
);
3091 gcc_assert(!is_parameter
|| init
== NULL
);
3094 // Traverse the initializer expression.
3097 Variable::traverse_expression(Traverse
* traverse
)
3099 if (this->preinit_
!= NULL
)
3101 if (this->preinit_
->traverse(traverse
) == TRAVERSE_EXIT
)
3102 return TRAVERSE_EXIT
;
3104 if (this->init_
!= NULL
)
3106 if (Expression::traverse(&this->init_
, traverse
) == TRAVERSE_EXIT
)
3107 return TRAVERSE_EXIT
;
3109 return TRAVERSE_CONTINUE
;
3112 // Lower the initialization expression after parsing is complete.
3115 Variable::lower_init_expression(Gogo
* gogo
, Named_object
* function
)
3117 if (this->init_
!= NULL
&& !this->init_is_lowered_
)
3121 // We will give an error elsewhere, this is just to prevent
3122 // an infinite loop.
3127 gogo
->lower_expression(function
, &this->init_
);
3129 this->seen_
= false;
3131 this->init_is_lowered_
= true;
3135 // Get the preinit block.
3138 Variable::preinit_block()
3140 gcc_assert(this->is_global_
);
3141 if (this->preinit_
== NULL
)
3142 this->preinit_
= new Block(NULL
, this->location());
3143 return this->preinit_
;
3146 // Add a statement to be run before the initialization expression.
3149 Variable::add_preinit_statement(Statement
* s
)
3151 Block
* b
= this->preinit_block();
3152 b
->add_statement(s
);
3153 b
->set_end_location(s
->location());
3156 // In an assignment which sets a variable to a tuple of EXPR, return
3157 // the type of the first element of the tuple.
3160 Variable::type_from_tuple(Expression
* expr
, bool report_error
) const
3162 if (expr
->map_index_expression() != NULL
)
3164 Map_type
* mt
= expr
->map_index_expression()->get_map_type();
3166 return Type::make_error_type();
3167 return mt
->val_type();
3169 else if (expr
->receive_expression() != NULL
)
3171 Expression
* channel
= expr
->receive_expression()->channel();
3172 Type
* channel_type
= channel
->type();
3173 if (channel_type
->channel_type() == NULL
)
3174 return Type::make_error_type();
3175 return channel_type
->channel_type()->element_type();
3180 error_at(this->location(), "invalid tuple definition");
3181 return Type::make_error_type();
3185 // Given EXPR used in a range clause, return either the index type or
3186 // the value type of the range, depending upon GET_INDEX_TYPE.
3189 Variable::type_from_range(Expression
* expr
, bool get_index_type
,
3190 bool report_error
) const
3192 Type
* t
= expr
->type();
3193 if (t
->array_type() != NULL
3194 || (t
->points_to() != NULL
3195 && t
->points_to()->array_type() != NULL
3196 && !t
->points_to()->is_open_array_type()))
3199 return Type::lookup_integer_type("int");
3201 return t
->deref()->array_type()->element_type();
3203 else if (t
->is_string_type())
3204 return Type::lookup_integer_type("int");
3205 else if (t
->map_type() != NULL
)
3208 return t
->map_type()->key_type();
3210 return t
->map_type()->val_type();
3212 else if (t
->channel_type() != NULL
)
3215 return t
->channel_type()->element_type();
3219 error_at(this->location(),
3220 "invalid definition of value variable for channel range");
3221 return Type::make_error_type();
3227 error_at(this->location(), "invalid type for range clause");
3228 return Type::make_error_type();
3232 // EXPR should be a channel. Return the channel's element type.
3235 Variable::type_from_chan_element(Expression
* expr
, bool report_error
) const
3237 Type
* t
= expr
->type();
3238 if (t
->channel_type() != NULL
)
3239 return t
->channel_type()->element_type();
3243 error_at(this->location(), "expected channel");
3244 return Type::make_error_type();
3248 // Return the type of the Variable. This may be called before
3249 // Variable::determine_type is called, which means that we may need to
3250 // get the type from the initializer. FIXME: If we combine lowering
3251 // with type determination, then this should be unnecessary.
3256 // A variable in a type switch with a nil case will have the wrong
3257 // type here. This gets fixed up in determine_type, below.
3258 Type
* type
= this->type_
;
3259 Expression
* init
= this->init_
;
3260 if (this->is_type_switch_var_
3261 && this->type_
->is_nil_constant_as_type())
3263 Type_guard_expression
* tge
= this->init_
->type_guard_expression();
3264 gcc_assert(tge
!= NULL
);
3271 if (this->type_
== NULL
|| !this->type_
->is_error_type())
3273 error_at(this->location_
, "variable initializer refers to itself");
3274 this->type_
= Type::make_error_type();
3283 else if (this->type_from_init_tuple_
)
3284 type
= this->type_from_tuple(init
, false);
3285 else if (this->type_from_range_index_
|| this->type_from_range_value_
)
3286 type
= this->type_from_range(init
, this->type_from_range_index_
, false);
3287 else if (this->type_from_chan_element_
)
3288 type
= this->type_from_chan_element(init
, false);
3291 gcc_assert(init
!= NULL
);
3292 type
= init
->type();
3293 gcc_assert(type
!= NULL
);
3295 // Variables should not have abstract types.
3296 if (type
->is_abstract())
3297 type
= type
->make_non_abstract_type();
3299 if (type
->is_void_type())
3300 type
= Type::make_error_type();
3303 this->seen_
= false;
3308 // Fetch the type from a const pointer, in which case it should have
3309 // been set already.
3312 Variable::type() const
3314 gcc_assert(this->type_
!= NULL
);
3318 // Set the type if necessary.
3321 Variable::determine_type()
3323 // A variable in a type switch with a nil case will have the wrong
3324 // type here. It will have an initializer which is a type guard.
3325 // We want to initialize it to the value without the type guard, and
3326 // use the type of that value as well.
3327 if (this->is_type_switch_var_
&& this->type_
->is_nil_constant_as_type())
3329 Type_guard_expression
* tge
= this->init_
->type_guard_expression();
3330 gcc_assert(tge
!= NULL
);
3332 this->init_
= tge
->expr();
3335 if (this->init_
== NULL
)
3336 gcc_assert(this->type_
!= NULL
&& !this->type_
->is_abstract());
3337 else if (this->type_from_init_tuple_
)
3339 Expression
*init
= this->init_
;
3340 init
->determine_type_no_context();
3341 this->type_
= this->type_from_tuple(init
, true);
3344 else if (this->type_from_range_index_
|| this->type_from_range_value_
)
3346 Expression
* init
= this->init_
;
3347 init
->determine_type_no_context();
3348 this->type_
= this->type_from_range(init
, this->type_from_range_index_
,
3354 // type_from_chan_element_ should have been cleared during
3356 gcc_assert(!this->type_from_chan_element_
);
3358 Type_context
context(this->type_
, false);
3359 this->init_
->determine_type(&context
);
3360 if (this->type_
== NULL
)
3362 Type
* type
= this->init_
->type();
3363 gcc_assert(type
!= NULL
);
3364 if (type
->is_abstract())
3365 type
= type
->make_non_abstract_type();
3367 if (type
->is_void_type())
3369 error_at(this->location_
, "variable has no type");
3370 type
= Type::make_error_type();
3372 else if (type
->is_nil_type())
3374 error_at(this->location_
, "variable defined to nil type");
3375 type
= Type::make_error_type();
3377 else if (type
->is_call_multiple_result_type())
3379 error_at(this->location_
,
3380 "single variable set to multiple value function call");
3381 type
= Type::make_error_type();
3389 // Export the variable
3392 Variable::export_var(Export
* exp
, const std::string
& name
) const
3394 gcc_assert(this->is_global_
);
3395 exp
->write_c_string("var ");
3396 exp
->write_string(name
);
3397 exp
->write_c_string(" ");
3398 exp
->write_type(this->type());
3399 exp
->write_c_string(";\n");
3402 // Import a variable.
3405 Variable::import_var(Import
* imp
, std::string
* pname
, Type
** ptype
)
3407 imp
->require_c_string("var ");
3408 *pname
= imp
->read_identifier();
3409 imp
->require_c_string(" ");
3410 *ptype
= imp
->read_type();
3411 imp
->require_c_string(";\n");
3414 // Class Named_constant.
3416 // Traverse the initializer expression.
3419 Named_constant::traverse_expression(Traverse
* traverse
)
3421 return Expression::traverse(&this->expr_
, traverse
);
3424 // Determine the type of the constant.
3427 Named_constant::determine_type()
3429 if (this->type_
!= NULL
)
3431 Type_context
context(this->type_
, false);
3432 this->expr_
->determine_type(&context
);
3436 // A constant may have an abstract type.
3437 Type_context
context(NULL
, true);
3438 this->expr_
->determine_type(&context
);
3439 this->type_
= this->expr_
->type();
3440 gcc_assert(this->type_
!= NULL
);
3444 // Indicate that we found and reported an error for this constant.
3447 Named_constant::set_error()
3449 this->type_
= Type::make_error_type();
3450 this->expr_
= Expression::make_error(this->location_
);
3453 // Export a constant.
3456 Named_constant::export_const(Export
* exp
, const std::string
& name
) const
3458 exp
->write_c_string("const ");
3459 exp
->write_string(name
);
3460 exp
->write_c_string(" ");
3461 if (!this->type_
->is_abstract())
3463 exp
->write_type(this->type_
);
3464 exp
->write_c_string(" ");
3466 exp
->write_c_string("= ");
3467 this->expr()->export_expression(exp
);
3468 exp
->write_c_string(";\n");
3471 // Import a constant.
3474 Named_constant::import_const(Import
* imp
, std::string
* pname
, Type
** ptype
,
3477 imp
->require_c_string("const ");
3478 *pname
= imp
->read_identifier();
3479 imp
->require_c_string(" ");
3480 if (imp
->peek_char() == '=')
3484 *ptype
= imp
->read_type();
3485 imp
->require_c_string(" ");
3487 imp
->require_c_string("= ");
3488 *pexpr
= Expression::import_expression(imp
);
3489 imp
->require_c_string(";\n");
3495 Type_declaration::add_method(const std::string
& name
, Function
* function
)
3497 Named_object
* ret
= Named_object::make_function(name
, NULL
, function
);
3498 this->methods_
.push_back(ret
);
3502 // Add a method declaration.
3505 Type_declaration::add_method_declaration(const std::string
& name
,
3506 Function_type
* type
,
3507 source_location location
)
3509 Named_object
* ret
= Named_object::make_function_declaration(name
, NULL
, type
,
3511 this->methods_
.push_back(ret
);
3515 // Return whether any methods ere defined.
3518 Type_declaration::has_methods() const
3520 return !this->methods_
.empty();
3523 // Define methods for the real type.
3526 Type_declaration::define_methods(Named_type
* nt
)
3528 for (Methods::const_iterator p
= this->methods_
.begin();
3529 p
!= this->methods_
.end();
3531 nt
->add_existing_method(*p
);
3534 // We are using the type. Return true if we should issue a warning.
3537 Type_declaration::using_type()
3539 bool ret
= !this->issued_warning_
;
3540 this->issued_warning_
= true;
3544 // Class Unknown_name.
3546 // Set the real named object.
3549 Unknown_name::set_real_named_object(Named_object
* no
)
3551 gcc_assert(this->real_named_object_
== NULL
);
3552 gcc_assert(!no
->is_unknown());
3553 this->real_named_object_
= no
;
3556 // Class Named_object.
3558 Named_object::Named_object(const std::string
& name
,
3559 const Package
* package
,
3560 Classification classification
)
3561 : name_(name
), package_(package
), classification_(classification
),
3564 if (Gogo::is_sink_name(name
))
3565 gcc_assert(classification
== NAMED_OBJECT_SINK
);
3568 // Make an unknown name. This is used by the parser. The name must
3569 // be resolved later. Unknown names are only added in the current
3573 Named_object::make_unknown_name(const std::string
& name
,
3574 source_location location
)
3576 Named_object
* named_object
= new Named_object(name
, NULL
,
3577 NAMED_OBJECT_UNKNOWN
);
3578 Unknown_name
* value
= new Unknown_name(location
);
3579 named_object
->u_
.unknown_value
= value
;
3580 return named_object
;
3586 Named_object::make_constant(const Typed_identifier
& tid
,
3587 const Package
* package
, Expression
* expr
,
3590 Named_object
* named_object
= new Named_object(tid
.name(), package
,
3591 NAMED_OBJECT_CONST
);
3592 Named_constant
* named_constant
= new Named_constant(tid
.type(), expr
,
3595 named_object
->u_
.const_value
= named_constant
;
3596 return named_object
;
3599 // Make a named type.
3602 Named_object::make_type(const std::string
& name
, const Package
* package
,
3603 Type
* type
, source_location location
)
3605 Named_object
* named_object
= new Named_object(name
, package
,
3607 Named_type
* named_type
= Type::make_named_type(named_object
, type
, location
);
3608 named_object
->u_
.type_value
= named_type
;
3609 return named_object
;
3612 // Make a type declaration.
3615 Named_object::make_type_declaration(const std::string
& name
,
3616 const Package
* package
,
3617 source_location location
)
3619 Named_object
* named_object
= new Named_object(name
, package
,
3620 NAMED_OBJECT_TYPE_DECLARATION
);
3621 Type_declaration
* type_declaration
= new Type_declaration(location
);
3622 named_object
->u_
.type_declaration
= type_declaration
;
3623 return named_object
;
3629 Named_object::make_variable(const std::string
& name
, const Package
* package
,
3632 Named_object
* named_object
= new Named_object(name
, package
,
3634 named_object
->u_
.var_value
= variable
;
3635 return named_object
;
3638 // Make a result variable.
3641 Named_object::make_result_variable(const std::string
& name
,
3642 Result_variable
* result
)
3644 Named_object
* named_object
= new Named_object(name
, NULL
,
3645 NAMED_OBJECT_RESULT_VAR
);
3646 named_object
->u_
.result_var_value
= result
;
3647 return named_object
;
3650 // Make a sink. This is used for the special blank identifier _.
3653 Named_object::make_sink()
3655 return new Named_object("_", NULL
, NAMED_OBJECT_SINK
);
3658 // Make a named function.
3661 Named_object::make_function(const std::string
& name
, const Package
* package
,
3664 Named_object
* named_object
= new Named_object(name
, package
,
3666 named_object
->u_
.func_value
= function
;
3667 return named_object
;
3670 // Make a function declaration.
3673 Named_object::make_function_declaration(const std::string
& name
,
3674 const Package
* package
,
3675 Function_type
* fntype
,
3676 source_location location
)
3678 Named_object
* named_object
= new Named_object(name
, package
,
3679 NAMED_OBJECT_FUNC_DECLARATION
);
3680 Function_declaration
*func_decl
= new Function_declaration(fntype
, location
);
3681 named_object
->u_
.func_declaration_value
= func_decl
;
3682 return named_object
;
3688 Named_object::make_package(const std::string
& alias
, Package
* package
)
3690 Named_object
* named_object
= new Named_object(alias
, NULL
,
3691 NAMED_OBJECT_PACKAGE
);
3692 named_object
->u_
.package_value
= package
;
3693 return named_object
;
3696 // Return the name to use in an error message.
3699 Named_object::message_name() const
3701 if (this->package_
== NULL
)
3702 return Gogo::message_name(this->name_
);
3703 std::string ret
= Gogo::message_name(this->package_
->name());
3705 ret
+= Gogo::message_name(this->name_
);
3709 // Set the type when a declaration is defined.
3712 Named_object::set_type_value(Named_type
* named_type
)
3714 gcc_assert(this->classification_
== NAMED_OBJECT_TYPE_DECLARATION
);
3715 Type_declaration
* td
= this->u_
.type_declaration
;
3716 td
->define_methods(named_type
);
3717 Named_object
* in_function
= td
->in_function();
3718 if (in_function
!= NULL
)
3719 named_type
->set_in_function(in_function
);
3721 this->classification_
= NAMED_OBJECT_TYPE
;
3722 this->u_
.type_value
= named_type
;
3725 // Define a function which was previously declared.
3728 Named_object::set_function_value(Function
* function
)
3730 gcc_assert(this->classification_
== NAMED_OBJECT_FUNC_DECLARATION
);
3731 this->classification_
= NAMED_OBJECT_FUNC
;
3732 // FIXME: We should free the old value.
3733 this->u_
.func_value
= function
;
3736 // Declare an unknown object as a type declaration.
3739 Named_object::declare_as_type()
3741 gcc_assert(this->classification_
== NAMED_OBJECT_UNKNOWN
);
3742 Unknown_name
* unk
= this->u_
.unknown_value
;
3743 this->classification_
= NAMED_OBJECT_TYPE_DECLARATION
;
3744 this->u_
.type_declaration
= new Type_declaration(unk
->location());
3748 // Return the location of a named object.
3751 Named_object::location() const
3753 switch (this->classification_
)
3756 case NAMED_OBJECT_UNINITIALIZED
:
3759 case NAMED_OBJECT_UNKNOWN
:
3760 return this->unknown_value()->location();
3762 case NAMED_OBJECT_CONST
:
3763 return this->const_value()->location();
3765 case NAMED_OBJECT_TYPE
:
3766 return this->type_value()->location();
3768 case NAMED_OBJECT_TYPE_DECLARATION
:
3769 return this->type_declaration_value()->location();
3771 case NAMED_OBJECT_VAR
:
3772 return this->var_value()->location();
3774 case NAMED_OBJECT_RESULT_VAR
:
3775 return this->result_var_value()->function()->location();
3777 case NAMED_OBJECT_SINK
:
3780 case NAMED_OBJECT_FUNC
:
3781 return this->func_value()->location();
3783 case NAMED_OBJECT_FUNC_DECLARATION
:
3784 return this->func_declaration_value()->location();
3786 case NAMED_OBJECT_PACKAGE
:
3787 return this->package_value()->location();
3791 // Export a named object.
3794 Named_object::export_named_object(Export
* exp
) const
3796 switch (this->classification_
)
3799 case NAMED_OBJECT_UNINITIALIZED
:
3800 case NAMED_OBJECT_UNKNOWN
:
3803 case NAMED_OBJECT_CONST
:
3804 this->const_value()->export_const(exp
, this->name_
);
3807 case NAMED_OBJECT_TYPE
:
3808 this->type_value()->export_named_type(exp
, this->name_
);
3811 case NAMED_OBJECT_TYPE_DECLARATION
:
3812 error_at(this->type_declaration_value()->location(),
3813 "attempt to export %<%s%> which was declared but not defined",
3814 this->message_name().c_str());
3817 case NAMED_OBJECT_FUNC_DECLARATION
:
3818 this->func_declaration_value()->export_func(exp
, this->name_
);
3821 case NAMED_OBJECT_VAR
:
3822 this->var_value()->export_var(exp
, this->name_
);
3825 case NAMED_OBJECT_RESULT_VAR
:
3826 case NAMED_OBJECT_SINK
:
3829 case NAMED_OBJECT_FUNC
:
3830 this->func_value()->export_func(exp
, this->name_
);
3837 Bindings::Bindings(Bindings
* enclosing
)
3838 : enclosing_(enclosing
), named_objects_(), bindings_()
3845 Bindings::clear_file_scope()
3847 Contour::iterator p
= this->bindings_
.begin();
3848 while (p
!= this->bindings_
.end())
3851 if (p
->second
->package() != NULL
)
3853 else if (p
->second
->is_package())
3855 else if (p
->second
->is_function()
3856 && !p
->second
->func_value()->type()->is_method()
3857 && Gogo::unpack_hidden_name(p
->second
->name()) == "init")
3865 p
= this->bindings_
.erase(p
);
3869 // Look up a symbol.
3872 Bindings::lookup(const std::string
& name
) const
3874 Contour::const_iterator p
= this->bindings_
.find(name
);
3875 if (p
!= this->bindings_
.end())
3876 return p
->second
->resolve();
3877 else if (this->enclosing_
!= NULL
)
3878 return this->enclosing_
->lookup(name
);
3883 // Look up a symbol locally.
3886 Bindings::lookup_local(const std::string
& name
) const
3888 Contour::const_iterator p
= this->bindings_
.find(name
);
3889 if (p
== this->bindings_
.end())
3894 // Remove an object from a set of bindings. This is used for a
3895 // special case in thunks for functions which call recover.
3898 Bindings::remove_binding(Named_object
* no
)
3900 Contour::iterator pb
= this->bindings_
.find(no
->name());
3901 gcc_assert(pb
!= this->bindings_
.end());
3902 this->bindings_
.erase(pb
);
3903 for (std::vector
<Named_object
*>::iterator pn
= this->named_objects_
.begin();
3904 pn
!= this->named_objects_
.end();
3909 this->named_objects_
.erase(pn
);
3916 // Add a method to the list of objects. This is not added to the
3917 // lookup table. This is so that we have a single list of objects
3918 // declared at the top level, which we walk through when it's time to
3919 // convert to trees.
3922 Bindings::add_method(Named_object
* method
)
3924 this->named_objects_
.push_back(method
);
3927 // Add a generic Named_object to a Contour.
3930 Bindings::add_named_object_to_contour(Contour
* contour
,
3931 Named_object
* named_object
)
3933 gcc_assert(named_object
== named_object
->resolve());
3934 const std::string
& name(named_object
->name());
3935 gcc_assert(!Gogo::is_sink_name(name
));
3937 std::pair
<Contour::iterator
, bool> ins
=
3938 contour
->insert(std::make_pair(name
, named_object
));
3941 // The name was already there.
3942 if (named_object
->package() != NULL
3943 && ins
.first
->second
->package() == named_object
->package()
3944 && (ins
.first
->second
->classification()
3945 == named_object
->classification()))
3947 // This is a second import of the same object.
3948 return ins
.first
->second
;
3950 ins
.first
->second
= this->new_definition(ins
.first
->second
,
3952 return ins
.first
->second
;
3956 // Don't push declarations on the list. We push them on when
3957 // and if we find the definitions. That way we genericize the
3958 // functions in order.
3959 if (!named_object
->is_type_declaration()
3960 && !named_object
->is_function_declaration()
3961 && !named_object
->is_unknown())
3962 this->named_objects_
.push_back(named_object
);
3963 return named_object
;
3967 // We had an existing named object OLD_OBJECT, and we've seen a new
3968 // one NEW_OBJECT with the same name. FIXME: This does not free the
3969 // new object when we don't need it.
3972 Bindings::new_definition(Named_object
* old_object
, Named_object
* new_object
)
3975 switch (old_object
->classification())
3978 case Named_object::NAMED_OBJECT_UNINITIALIZED
:
3981 case Named_object::NAMED_OBJECT_UNKNOWN
:
3983 Named_object
* real
= old_object
->unknown_value()->real_named_object();
3985 return this->new_definition(real
, new_object
);
3986 gcc_assert(!new_object
->is_unknown());
3987 old_object
->unknown_value()->set_real_named_object(new_object
);
3988 if (!new_object
->is_type_declaration()
3989 && !new_object
->is_function_declaration())
3990 this->named_objects_
.push_back(new_object
);
3994 case Named_object::NAMED_OBJECT_CONST
:
3997 case Named_object::NAMED_OBJECT_TYPE
:
3998 if (new_object
->is_type_declaration())
4002 case Named_object::NAMED_OBJECT_TYPE_DECLARATION
:
4003 if (new_object
->is_type_declaration())
4005 if (new_object
->is_type())
4007 old_object
->set_type_value(new_object
->type_value());
4008 new_object
->type_value()->set_named_object(old_object
);
4009 this->named_objects_
.push_back(old_object
);
4014 case Named_object::NAMED_OBJECT_VAR
:
4015 case Named_object::NAMED_OBJECT_RESULT_VAR
:
4018 case Named_object::NAMED_OBJECT_SINK
:
4021 case Named_object::NAMED_OBJECT_FUNC
:
4022 if (new_object
->is_function_declaration())
4024 if (!new_object
->func_declaration_value()->asm_name().empty())
4025 sorry("__asm__ for function definitions");
4026 Function_type
* old_type
= old_object
->func_value()->type();
4027 Function_type
* new_type
=
4028 new_object
->func_declaration_value()->type();
4029 if (old_type
->is_valid_redeclaration(new_type
, &reason
))
4034 case Named_object::NAMED_OBJECT_FUNC_DECLARATION
:
4036 Function_type
* old_type
= old_object
->func_declaration_value()->type();
4037 if (new_object
->is_function_declaration())
4039 Function_type
* new_type
=
4040 new_object
->func_declaration_value()->type();
4041 if (old_type
->is_valid_redeclaration(new_type
, &reason
))
4044 if (new_object
->is_function())
4046 Function_type
* new_type
= new_object
->func_value()->type();
4047 if (old_type
->is_valid_redeclaration(new_type
, &reason
))
4049 if (!old_object
->func_declaration_value()->asm_name().empty())
4050 sorry("__asm__ for function definitions");
4051 old_object
->set_function_value(new_object
->func_value());
4052 this->named_objects_
.push_back(old_object
);
4059 case Named_object::NAMED_OBJECT_PACKAGE
:
4060 if (new_object
->is_package()
4061 && (old_object
->package_value()->name()
4062 == new_object
->package_value()->name()))
4068 std::string n
= old_object
->message_name();
4070 error_at(new_object
->location(), "redefinition of %qs", n
.c_str());
4072 error_at(new_object
->location(), "redefinition of %qs: %s", n
.c_str(),
4075 inform(old_object
->location(), "previous definition of %qs was here",
4081 // Add a named type.
4084 Bindings::add_named_type(Named_type
* named_type
)
4086 return this->add_named_object(named_type
->named_object());
4092 Bindings::add_function(const std::string
& name
, const Package
* package
,
4095 return this->add_named_object(Named_object::make_function(name
, package
,
4099 // Add a function declaration.
4102 Bindings::add_function_declaration(const std::string
& name
,
4103 const Package
* package
,
4104 Function_type
* type
,
4105 source_location location
)
4107 Named_object
* no
= Named_object::make_function_declaration(name
, package
,
4109 return this->add_named_object(no
);
4112 // Define a type which was previously declared.
4115 Bindings::define_type(Named_object
* no
, Named_type
* type
)
4117 no
->set_type_value(type
);
4118 this->named_objects_
.push_back(no
);
4121 // Traverse bindings.
4124 Bindings::traverse(Traverse
* traverse
, bool is_global
)
4126 unsigned int traverse_mask
= traverse
->traverse_mask();
4128 // We don't use an iterator because we permit the traversal to add
4129 // new global objects.
4130 for (size_t i
= 0; i
< this->named_objects_
.size(); ++i
)
4132 Named_object
* p
= this->named_objects_
[i
];
4133 switch (p
->classification())
4135 case Named_object::NAMED_OBJECT_CONST
:
4136 if ((traverse_mask
& Traverse::traverse_constants
) != 0)
4138 if (traverse
->constant(p
, is_global
) == TRAVERSE_EXIT
)
4139 return TRAVERSE_EXIT
;
4141 if ((traverse_mask
& Traverse::traverse_types
) != 0
4142 || (traverse_mask
& Traverse::traverse_expressions
) != 0)
4144 Type
* t
= p
->const_value()->type();
4146 && Type::traverse(t
, traverse
) == TRAVERSE_EXIT
)
4147 return TRAVERSE_EXIT
;
4149 if ((traverse_mask
& Traverse::traverse_expressions
) != 0)
4151 if (p
->const_value()->traverse_expression(traverse
)
4153 return TRAVERSE_EXIT
;
4157 case Named_object::NAMED_OBJECT_VAR
:
4158 case Named_object::NAMED_OBJECT_RESULT_VAR
:
4159 if ((traverse_mask
& Traverse::traverse_variables
) != 0)
4161 if (traverse
->variable(p
) == TRAVERSE_EXIT
)
4162 return TRAVERSE_EXIT
;
4164 if (((traverse_mask
& Traverse::traverse_types
) != 0
4165 || (traverse_mask
& Traverse::traverse_expressions
) != 0)
4166 && (p
->is_result_variable()
4167 || p
->var_value()->has_type()))
4169 Type
* t
= (p
->is_variable()
4170 ? p
->var_value()->type()
4171 : p
->result_var_value()->type());
4173 && Type::traverse(t
, traverse
) == TRAVERSE_EXIT
)
4174 return TRAVERSE_EXIT
;
4176 if (p
->is_variable()
4177 && (traverse_mask
& Traverse::traverse_expressions
) != 0)
4179 if (p
->var_value()->traverse_expression(traverse
)
4181 return TRAVERSE_EXIT
;
4185 case Named_object::NAMED_OBJECT_FUNC
:
4186 if ((traverse_mask
& Traverse::traverse_functions
) != 0)
4188 int t
= traverse
->function(p
);
4189 if (t
== TRAVERSE_EXIT
)
4190 return TRAVERSE_EXIT
;
4191 else if (t
== TRAVERSE_SKIP_COMPONENTS
)
4196 & (Traverse::traverse_variables
4197 | Traverse::traverse_constants
4198 | Traverse::traverse_functions
4199 | Traverse::traverse_blocks
4200 | Traverse::traverse_statements
4201 | Traverse::traverse_expressions
4202 | Traverse::traverse_types
)) != 0)
4204 if (p
->func_value()->traverse(traverse
) == TRAVERSE_EXIT
)
4205 return TRAVERSE_EXIT
;
4209 case Named_object::NAMED_OBJECT_PACKAGE
:
4210 // These are traversed in Gogo::traverse.
4211 gcc_assert(is_global
);
4214 case Named_object::NAMED_OBJECT_TYPE
:
4215 if ((traverse_mask
& Traverse::traverse_types
) != 0
4216 || (traverse_mask
& Traverse::traverse_expressions
) != 0)
4218 if (Type::traverse(p
->type_value(), traverse
) == TRAVERSE_EXIT
)
4219 return TRAVERSE_EXIT
;
4223 case Named_object::NAMED_OBJECT_TYPE_DECLARATION
:
4224 case Named_object::NAMED_OBJECT_FUNC_DECLARATION
:
4225 case Named_object::NAMED_OBJECT_UNKNOWN
:
4228 case Named_object::NAMED_OBJECT_SINK
:
4234 return TRAVERSE_CONTINUE
;
4239 Package::Package(const std::string
& name
, const std::string
& unique_prefix
,
4240 source_location location
)
4241 : name_(name
), unique_prefix_(unique_prefix
), bindings_(new Bindings(NULL
)),
4242 priority_(0), location_(location
), used_(false), is_imported_(false),
4243 uses_sink_alias_(false)
4245 gcc_assert(!name
.empty() && !unique_prefix
.empty());
4248 // Set the priority. We may see multiple priorities for an imported
4249 // package; we want to use the largest one.
4252 Package::set_priority(int priority
)
4254 if (priority
> this->priority_
)
4255 this->priority_
= priority
;
4258 // Determine types of constants. Everything else in a package
4259 // (variables, function declarations) should already have a fixed
4260 // type. Constants may have abstract types.
4263 Package::determine_types()
4265 Bindings
* bindings
= this->bindings_
;
4266 for (Bindings::const_definitions_iterator p
= bindings
->begin_definitions();
4267 p
!= bindings
->end_definitions();
4270 if ((*p
)->is_const())
4271 (*p
)->const_value()->determine_type();
4279 Traverse::~Traverse()
4281 if (this->types_seen_
!= NULL
)
4282 delete this->types_seen_
;
4283 if (this->expressions_seen_
!= NULL
)
4284 delete this->expressions_seen_
;
4287 // Record that we are looking at a type, and return true if we have
4291 Traverse::remember_type(const Type
* type
)
4293 if (type
->is_error_type())
4295 gcc_assert((this->traverse_mask() & traverse_types
) != 0
4296 || (this->traverse_mask() & traverse_expressions
) != 0);
4297 // We only have to remember named types, as they are the only ones
4298 // we can see multiple times in a traversal.
4299 if (type
->classification() != Type::TYPE_NAMED
)
4301 if (this->types_seen_
== NULL
)
4302 this->types_seen_
= new Types_seen();
4303 std::pair
<Types_seen::iterator
, bool> ins
= this->types_seen_
->insert(type
);
4307 // Record that we are looking at an expression, and return true if we
4308 // have already seen it.
4311 Traverse::remember_expression(const Expression
* expression
)
4313 gcc_assert((this->traverse_mask() & traverse_types
) != 0
4314 || (this->traverse_mask() & traverse_expressions
) != 0);
4315 if (this->expressions_seen_
== NULL
)
4316 this->expressions_seen_
= new Expressions_seen();
4317 std::pair
<Expressions_seen::iterator
, bool> ins
=
4318 this->expressions_seen_
->insert(expression
);
4322 // The default versions of these functions should never be called: the
4323 // traversal mask indicates which functions may be called.
4326 Traverse::variable(Named_object
*)
4332 Traverse::constant(Named_object
*, bool)
4338 Traverse::function(Named_object
*)
4344 Traverse::block(Block
*)
4350 Traverse::statement(Block
*, size_t*, Statement
*)
4356 Traverse::expression(Expression
**)
4362 Traverse::type(Type
*)