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 (Gogo::is_sink_name(name
))
419 return Named_object::make_sink();
421 for (Open_functions::const_reverse_iterator p
= this->functions_
.rbegin();
422 p
!= this->functions_
.rend();
425 Named_object
* ret
= p
->blocks
.back()->bindings()->lookup(name
);
428 if (pfunction
!= NULL
)
429 *pfunction
= p
->function
;
434 if (pfunction
!= NULL
)
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
))
662 ret
= Named_object::make_sink();
663 else if (!type
->is_method())
665 ret
= this->package_
->bindings()->add_function(*pname
, NULL
, function
);
666 if (!ret
->is_function())
668 // Redefinition error.
669 ret
= Named_object::make_function(name
, NULL
, function
);
674 if (!add_method_to_type
)
675 ret
= Named_object::make_function(name
, NULL
, function
);
678 gcc_assert(at_top_level
);
679 Type
* rtype
= type
->receiver()->type();
681 // We want to look through the pointer created by the
682 // parser, without getting an error if the type is not yet
684 if (rtype
->classification() == Type::TYPE_POINTER
)
685 rtype
= rtype
->points_to();
687 if (rtype
->is_error_type())
688 ret
= Named_object::make_function(name
, NULL
, function
);
689 else if (rtype
->named_type() != NULL
)
691 ret
= rtype
->named_type()->add_method(name
, function
);
692 if (!ret
->is_function())
694 // Redefinition error.
695 ret
= Named_object::make_function(name
, NULL
, function
);
698 else if (rtype
->forward_declaration_type() != NULL
)
700 Named_object
* type_no
=
701 rtype
->forward_declaration_type()->named_object();
702 if (type_no
->is_unknown())
704 // If we are seeing methods it really must be a
705 // type. Declare it as such. An alternative would
706 // be to support lists of methods for unknown
707 // expressions. Either way the error messages if
708 // this is not a type are going to get confusing.
709 Named_object
* declared
=
710 this->declare_package_type(type_no
->name(),
711 type_no
->location());
713 == type_no
->unknown_value()->real_named_object());
715 ret
= rtype
->forward_declaration_type()->add_method(name
,
721 this->package_
->bindings()->add_method(ret
);
724 this->functions_
.resize(this->functions_
.size() + 1);
725 Open_function
& of(this->functions_
.back());
727 of
.blocks
.push_back(block
);
729 if (!type
->is_method() && Gogo::unpack_hidden_name(name
) == "init")
731 this->init_functions_
.push_back(ret
);
732 this->need_init_fn_
= true;
738 // Finish compiling a function.
741 Gogo::finish_function(source_location location
)
743 this->finish_block(location
);
744 gcc_assert(this->functions_
.back().blocks
.empty());
745 this->functions_
.pop_back();
748 // Return the current function.
751 Gogo::current_function() const
753 gcc_assert(!this->functions_
.empty());
754 return this->functions_
.back().function
;
757 // Start a new block.
760 Gogo::start_block(source_location location
)
762 gcc_assert(!this->functions_
.empty());
763 Block
* block
= new Block(this->current_block(), location
);
764 this->functions_
.back().blocks
.push_back(block
);
770 Gogo::finish_block(source_location location
)
772 gcc_assert(!this->functions_
.empty());
773 gcc_assert(!this->functions_
.back().blocks
.empty());
774 Block
* block
= this->functions_
.back().blocks
.back();
775 this->functions_
.back().blocks
.pop_back();
776 block
->set_end_location(location
);
780 // Add an unknown name.
783 Gogo::add_unknown_name(const std::string
& name
, source_location location
)
785 return this->package_
->bindings()->add_unknown_name(name
, location
);
788 // Declare a function.
791 Gogo::declare_function(const std::string
& name
, Function_type
* type
,
792 source_location location
)
794 if (!type
->is_method())
795 return this->current_bindings()->add_function_declaration(name
, NULL
, type
,
799 // We don't bother to add this to the list of global
801 Type
* rtype
= type
->receiver()->type();
803 // We want to look through the pointer created by the
804 // parser, without getting an error if the type is not yet
806 if (rtype
->classification() == Type::TYPE_POINTER
)
807 rtype
= rtype
->points_to();
809 if (rtype
->is_error_type())
811 else if (rtype
->named_type() != NULL
)
812 return rtype
->named_type()->add_method_declaration(name
, NULL
, type
,
814 else if (rtype
->forward_declaration_type() != NULL
)
816 Forward_declaration_type
* ftype
= rtype
->forward_declaration_type();
817 return ftype
->add_method_declaration(name
, type
, location
);
824 // Add a label definition.
827 Gogo::add_label_definition(const std::string
& label_name
,
828 source_location location
)
830 gcc_assert(!this->functions_
.empty());
831 Function
* func
= this->functions_
.back().function
->func_value();
832 Label
* label
= func
->add_label_definition(label_name
, location
);
833 this->add_statement(Statement::make_label_statement(label
, location
));
837 // Add a label reference.
840 Gogo::add_label_reference(const std::string
& label_name
)
842 gcc_assert(!this->functions_
.empty());
843 Function
* func
= this->functions_
.back().function
->func_value();
844 return func
->add_label_reference(label_name
);
850 Gogo::add_statement(Statement
* statement
)
852 gcc_assert(!this->functions_
.empty()
853 && !this->functions_
.back().blocks
.empty());
854 this->functions_
.back().blocks
.back()->add_statement(statement
);
860 Gogo::add_block(Block
* block
, source_location location
)
862 gcc_assert(!this->functions_
.empty()
863 && !this->functions_
.back().blocks
.empty());
864 Statement
* statement
= Statement::make_block_statement(block
, location
);
865 this->functions_
.back().blocks
.back()->add_statement(statement
);
871 Gogo::add_constant(const Typed_identifier
& tid
, Expression
* expr
,
874 return this->current_bindings()->add_constant(tid
, NULL
, expr
, iota_value
);
880 Gogo::add_type(const std::string
& name
, Type
* type
, source_location location
)
882 Named_object
* no
= this->current_bindings()->add_type(name
, NULL
, type
,
884 if (!this->in_global_scope())
885 no
->type_value()->set_in_function(this->functions_
.back().function
);
891 Gogo::add_named_type(Named_type
* type
)
893 gcc_assert(this->in_global_scope());
894 this->current_bindings()->add_named_type(type
);
900 Gogo::declare_type(const std::string
& name
, source_location location
)
902 Bindings
* bindings
= this->current_bindings();
903 Named_object
* no
= bindings
->add_type_declaration(name
, NULL
, location
);
904 if (!this->in_global_scope())
906 Named_object
* f
= this->functions_
.back().function
;
907 no
->type_declaration_value()->set_in_function(f
);
912 // Declare a type at the package level.
915 Gogo::declare_package_type(const std::string
& name
, source_location location
)
917 return this->package_
->bindings()->add_type_declaration(name
, NULL
, location
);
920 // Define a type which was already declared.
923 Gogo::define_type(Named_object
* no
, Named_type
* type
)
925 this->current_bindings()->define_type(no
, type
);
931 Gogo::add_variable(const std::string
& name
, Variable
* variable
)
933 Named_object
* no
= this->current_bindings()->add_variable(name
, NULL
,
936 // In a function the middle-end wants to see a DECL_EXPR node.
939 && !no
->var_value()->is_parameter()
940 && !this->functions_
.empty())
941 this->add_statement(Statement::make_variable_declaration(no
));
946 // Add a sink--a reference to the blank identifier _.
951 return Named_object::make_sink();
954 // Add a named object.
957 Gogo::add_named_object(Named_object
* no
)
959 this->current_bindings()->add_named_object(no
);
962 // Record that we've seen an interface type.
965 Gogo::record_interface_type(Interface_type
* itype
)
967 this->interface_types_
.push_back(itype
);
970 // Return a name for a thunk object.
975 static int thunk_count
;
977 snprintf(thunk_name
, sizeof thunk_name
, "$thunk%d", thunk_count
);
982 // Return whether a function is a thunk.
985 Gogo::is_thunk(const Named_object
* no
)
987 return no
->name().compare(0, 6, "$thunk") == 0;
990 // Define the global names. We do this only after parsing all the
991 // input files, because the program might define the global names
995 Gogo::define_global_names()
997 for (Bindings::const_declarations_iterator p
=
998 this->globals_
->begin_declarations();
999 p
!= this->globals_
->end_declarations();
1002 Named_object
* global_no
= p
->second
;
1003 std::string
name(Gogo::pack_hidden_name(global_no
->name(), false));
1004 Named_object
* no
= this->package_
->bindings()->lookup(name
);
1008 if (no
->is_type_declaration())
1010 if (global_no
->is_type())
1012 if (no
->type_declaration_value()->has_methods())
1013 error_at(no
->location(),
1014 "may not define methods for global type");
1015 no
->set_type_value(global_no
->type_value());
1019 error_at(no
->location(), "expected type");
1020 Type
* errtype
= Type::make_error_type();
1021 Named_object
* err
= Named_object::make_type("error", NULL
,
1024 no
->set_type_value(err
->type_value());
1027 else if (no
->is_unknown())
1028 no
->unknown_value()->set_real_named_object(global_no
);
1032 // Clear out names in file scope.
1035 Gogo::clear_file_scope()
1037 this->package_
->bindings()->clear_file_scope();
1039 // Warn about packages which were imported but not used.
1040 for (Packages::iterator p
= this->packages_
.begin();
1041 p
!= this->packages_
.end();
1044 Package
* package
= p
->second
;
1045 if (package
!= this->package_
1046 && package
->is_imported()
1048 && !package
->uses_sink_alias()
1050 error_at(package
->location(), "imported and not used: %s",
1051 Gogo::message_name(package
->name()).c_str());
1052 package
->clear_is_imported();
1053 package
->clear_uses_sink_alias();
1054 package
->clear_used();
1058 // Traverse the tree.
1061 Gogo::traverse(Traverse
* traverse
)
1063 // Traverse the current package first for consistency. The other
1064 // packages will only contain imported types, constants, and
1066 if (this->package_
->bindings()->traverse(traverse
, true) == TRAVERSE_EXIT
)
1068 for (Packages::const_iterator p
= this->packages_
.begin();
1069 p
!= this->packages_
.end();
1072 if (p
->second
!= this->package_
)
1074 if (p
->second
->bindings()->traverse(traverse
, true) == TRAVERSE_EXIT
)
1080 // Traversal class used to verify types.
1082 class Verify_types
: public Traverse
1086 : Traverse(traverse_types
)
1093 // Verify that a type is correct.
1096 Verify_types::type(Type
* t
)
1098 // Don't verify types defined in other packages.
1099 Named_type
* nt
= t
->named_type();
1100 if (nt
!= NULL
&& nt
->named_object()->package() != NULL
)
1101 return TRAVERSE_SKIP_COMPONENTS
;
1104 return TRAVERSE_SKIP_COMPONENTS
;
1105 return TRAVERSE_CONTINUE
;
1108 // Verify that all types are correct.
1111 Gogo::verify_types()
1113 Verify_types traverse
;
1114 this->traverse(&traverse
);
1117 // Traversal class used to lower parse tree.
1119 class Lower_parse_tree
: public Traverse
1122 Lower_parse_tree(Gogo
* gogo
, Named_object
* function
)
1123 : Traverse(traverse_constants
1124 | traverse_functions
1125 | traverse_statements
1126 | traverse_expressions
),
1127 gogo_(gogo
), function_(function
), iota_value_(-1)
1131 constant(Named_object
*, bool);
1134 function(Named_object
*);
1137 statement(Block
*, size_t* pindex
, Statement
*);
1140 expression(Expression
**);
1145 // The function we are traversing.
1146 Named_object
* function_
;
1147 // Value to use for the predeclared constant iota.
1151 // Lower constants. We handle constants specially so that we can set
1152 // the right value for the predeclared constant iota. This works in
1153 // conjunction with the way we lower Const_expression objects.
1156 Lower_parse_tree::constant(Named_object
* no
, bool)
1158 Named_constant
* nc
= no
->const_value();
1160 // We can recursively a constant if the initializer expression
1161 // manages to refer to itself.
1163 return TRAVERSE_CONTINUE
;
1166 gcc_assert(this->iota_value_
== -1);
1167 this->iota_value_
= nc
->iota_value();
1168 nc
->traverse_expression(this);
1169 this->iota_value_
= -1;
1171 nc
->clear_lowering();
1173 // We will traverse the expression a second time, but that will be
1176 return TRAVERSE_CONTINUE
;
1179 // Lower function closure types. Record the function while lowering
1180 // it, so that we can pass it down when lowering an expression.
1183 Lower_parse_tree::function(Named_object
* no
)
1185 no
->func_value()->set_closure_type();
1187 gcc_assert(this->function_
== NULL
);
1188 this->function_
= no
;
1189 int t
= no
->func_value()->traverse(this);
1190 this->function_
= NULL
;
1192 if (t
== TRAVERSE_EXIT
)
1194 return TRAVERSE_SKIP_COMPONENTS
;
1197 // Lower statement parse trees.
1200 Lower_parse_tree::statement(Block
* block
, size_t* pindex
, Statement
* sorig
)
1202 // Lower the expressions first.
1203 int t
= sorig
->traverse_contents(this);
1204 if (t
== TRAVERSE_EXIT
)
1207 // Keep lowering until nothing changes.
1208 Statement
* s
= sorig
;
1211 Statement
* snew
= s
->lower(this->gogo_
, block
);
1215 t
= s
->traverse_contents(this);
1216 if (t
== TRAVERSE_EXIT
)
1221 block
->replace_statement(*pindex
, s
);
1223 return TRAVERSE_SKIP_COMPONENTS
;
1226 // Lower expression parse trees.
1229 Lower_parse_tree::expression(Expression
** pexpr
)
1231 // We have to lower all subexpressions first, so that we can get
1232 // their type if necessary. This is awkward, because we don't have
1233 // a postorder traversal pass.
1234 if ((*pexpr
)->traverse_subexpressions(this) == TRAVERSE_EXIT
)
1235 return TRAVERSE_EXIT
;
1236 // Keep lowering until nothing changes.
1239 Expression
* e
= *pexpr
;
1240 Expression
* enew
= e
->lower(this->gogo_
, this->function_
,
1246 return TRAVERSE_SKIP_COMPONENTS
;
1249 // Lower the parse tree. This is called after the parse is complete,
1250 // when all names should be resolved.
1253 Gogo::lower_parse_tree()
1255 Lower_parse_tree
lower_parse_tree(this, NULL
);
1256 this->traverse(&lower_parse_tree
);
1259 // Lower an expression.
1262 Gogo::lower_expression(Named_object
* function
, Expression
** pexpr
)
1264 Lower_parse_tree
lower_parse_tree(this, function
);
1265 lower_parse_tree
.expression(pexpr
);
1268 // Lower a constant. This is called when lowering a reference to a
1269 // constant. We have to make sure that the constant has already been
1273 Gogo::lower_constant(Named_object
* no
)
1275 gcc_assert(no
->is_const());
1276 Lower_parse_tree
lower(this, NULL
);
1277 lower
.constant(no
, false);
1280 // Look for interface types to finalize methods of inherited
1283 class Finalize_methods
: public Traverse
1286 Finalize_methods(Gogo
* gogo
)
1287 : Traverse(traverse_types
),
1298 // Finalize the methods of an interface type.
1301 Finalize_methods::type(Type
* t
)
1303 // Check the classification so that we don't finalize the methods
1304 // twice for a named interface type.
1305 switch (t
->classification())
1307 case Type::TYPE_INTERFACE
:
1308 t
->interface_type()->finalize_methods();
1311 case Type::TYPE_NAMED
:
1313 // We have to finalize the methods of the real type first.
1314 // But if the real type is a struct type, then we only want to
1315 // finalize the methods of the field types, not of the struct
1316 // type itself. We don't want to add methods to the struct,
1317 // since it has a name.
1318 Type
* rt
= t
->named_type()->real_type();
1319 if (rt
->classification() != Type::TYPE_STRUCT
)
1321 if (Type::traverse(rt
, this) == TRAVERSE_EXIT
)
1322 return TRAVERSE_EXIT
;
1326 if (rt
->struct_type()->traverse_field_types(this) == TRAVERSE_EXIT
)
1327 return TRAVERSE_EXIT
;
1330 t
->named_type()->finalize_methods(this->gogo_
);
1332 return TRAVERSE_SKIP_COMPONENTS
;
1335 case Type::TYPE_STRUCT
:
1336 t
->struct_type()->finalize_methods(this->gogo_
);
1343 return TRAVERSE_CONTINUE
;
1346 // Finalize method lists and build stub methods for types.
1349 Gogo::finalize_methods()
1351 Finalize_methods
finalize(this);
1352 this->traverse(&finalize
);
1355 // Set types for unspecified variables and constants.
1358 Gogo::determine_types()
1360 Bindings
* bindings
= this->current_bindings();
1361 for (Bindings::const_definitions_iterator p
= bindings
->begin_definitions();
1362 p
!= bindings
->end_definitions();
1365 if ((*p
)->is_function())
1366 (*p
)->func_value()->determine_types();
1367 else if ((*p
)->is_variable())
1368 (*p
)->var_value()->determine_type();
1369 else if ((*p
)->is_const())
1370 (*p
)->const_value()->determine_type();
1372 // See if a variable requires us to build an initialization
1373 // function. We know that we will see all global variables
1375 if (!this->need_init_fn_
&& (*p
)->is_variable())
1377 Variable
* variable
= (*p
)->var_value();
1379 // If this is a global variable which requires runtime
1380 // initialization, we need an initialization function.
1381 if (!variable
->is_global() || variable
->init() == NULL
)
1383 else if (variable
->type()->interface_type() != NULL
)
1384 this->need_init_fn_
= true;
1385 else if (variable
->init()->is_constant())
1387 else if (!variable
->init()->is_composite_literal())
1388 this->need_init_fn_
= true;
1389 else if (variable
->init()->is_nonconstant_composite_literal())
1390 this->need_init_fn_
= true;
1392 // If this is a global variable which holds a pointer value,
1393 // then we need an initialization function to register it as a
1395 if (variable
->is_global() && variable
->type()->has_pointer())
1396 this->need_init_fn_
= true;
1400 // Determine the types of constants in packages.
1401 for (Packages::const_iterator p
= this->packages_
.begin();
1402 p
!= this->packages_
.end();
1404 p
->second
->determine_types();
1407 // Traversal class used for type checking.
1409 class Check_types_traverse
: public Traverse
1412 Check_types_traverse(Gogo
* gogo
)
1413 : Traverse(traverse_variables
1414 | traverse_constants
1415 | traverse_statements
1416 | traverse_expressions
),
1421 variable(Named_object
*);
1424 constant(Named_object
*, bool);
1427 statement(Block
*, size_t* pindex
, Statement
*);
1430 expression(Expression
**);
1437 // Check that a variable initializer has the right type.
1440 Check_types_traverse::variable(Named_object
* named_object
)
1442 if (named_object
->is_variable())
1444 Variable
* var
= named_object
->var_value();
1445 Expression
* init
= var
->init();
1448 && !Type::are_assignable(var
->type(), init
->type(), &reason
))
1451 error_at(var
->location(), "incompatible type in initialization");
1453 error_at(var
->location(),
1454 "incompatible type in initialization (%s)",
1459 return TRAVERSE_CONTINUE
;
1462 // Check that a constant initializer has the right type.
1465 Check_types_traverse::constant(Named_object
* named_object
, bool)
1467 Named_constant
* constant
= named_object
->const_value();
1468 Type
* ctype
= constant
->type();
1469 if (ctype
->integer_type() == NULL
1470 && ctype
->float_type() == NULL
1471 && ctype
->complex_type() == NULL
1472 && !ctype
->is_boolean_type()
1473 && !ctype
->is_string_type())
1475 if (!ctype
->is_error_type())
1476 error_at(constant
->location(), "invalid constant type");
1477 constant
->set_error();
1479 else if (!constant
->expr()->is_constant())
1481 error_at(constant
->expr()->location(), "expression is not constant");
1482 constant
->set_error();
1484 else if (!Type::are_assignable(constant
->type(), constant
->expr()->type(),
1487 error_at(constant
->location(),
1488 "initialization expression has wrong type");
1489 constant
->set_error();
1491 return TRAVERSE_CONTINUE
;
1494 // Check that types are valid in a statement.
1497 Check_types_traverse::statement(Block
*, size_t*, Statement
* s
)
1499 s
->check_types(this->gogo_
);
1500 return TRAVERSE_CONTINUE
;
1503 // Check that types are valid in an expression.
1506 Check_types_traverse::expression(Expression
** expr
)
1508 (*expr
)->check_types(this->gogo_
);
1509 return TRAVERSE_CONTINUE
;
1512 // Check that types are valid.
1517 Check_types_traverse
traverse(this);
1518 this->traverse(&traverse
);
1521 // Check the types in a single block.
1524 Gogo::check_types_in_block(Block
* block
)
1526 Check_types_traverse
traverse(this);
1527 block
->traverse(&traverse
);
1530 // A traversal class used to find a single shortcut operator within an
1533 class Find_shortcut
: public Traverse
1537 : Traverse(traverse_blocks
1538 | traverse_statements
1539 | traverse_expressions
),
1543 // A pointer to the expression which was found, or NULL if none was
1547 { return this->found_
; }
1552 { return TRAVERSE_SKIP_COMPONENTS
; }
1555 statement(Block
*, size_t*, Statement
*)
1556 { return TRAVERSE_SKIP_COMPONENTS
; }
1559 expression(Expression
**);
1562 Expression
** found_
;
1565 // Find a shortcut expression.
1568 Find_shortcut::expression(Expression
** pexpr
)
1570 Expression
* expr
= *pexpr
;
1571 Binary_expression
* be
= expr
->binary_expression();
1573 return TRAVERSE_CONTINUE
;
1574 Operator op
= be
->op();
1575 if (op
!= OPERATOR_OROR
&& op
!= OPERATOR_ANDAND
)
1576 return TRAVERSE_CONTINUE
;
1577 gcc_assert(this->found_
== NULL
);
1578 this->found_
= pexpr
;
1579 return TRAVERSE_EXIT
;
1582 // A traversal class used to turn shortcut operators into explicit if
1585 class Shortcuts
: public Traverse
1589 : Traverse(traverse_variables
1590 | traverse_statements
)
1595 variable(Named_object
*);
1598 statement(Block
*, size_t*, Statement
*);
1601 // Convert a shortcut operator.
1603 convert_shortcut(Block
* enclosing
, Expression
** pshortcut
);
1606 // Remove shortcut operators in a single statement.
1609 Shortcuts::statement(Block
* block
, size_t* pindex
, Statement
* s
)
1611 // FIXME: This approach doesn't work for switch statements, because
1612 // we add the new statements before the whole switch when we need to
1613 // instead add them just before the switch expression. The right
1614 // fix is probably to lower switch statements with nonconstant cases
1615 // to a series of conditionals.
1616 if (s
->switch_statement() != NULL
)
1617 return TRAVERSE_CONTINUE
;
1621 Find_shortcut find_shortcut
;
1623 // If S is a variable declaration, then ordinary traversal won't
1624 // do anything. We want to explicitly traverse the
1625 // initialization expression if there is one.
1626 Variable_declaration_statement
* vds
= s
->variable_declaration_statement();
1627 Expression
* init
= NULL
;
1629 s
->traverse_contents(&find_shortcut
);
1632 init
= vds
->var()->var_value()->init();
1634 return TRAVERSE_CONTINUE
;
1635 init
->traverse(&init
, &find_shortcut
);
1637 Expression
** pshortcut
= find_shortcut
.found();
1638 if (pshortcut
== NULL
)
1639 return TRAVERSE_CONTINUE
;
1641 Statement
* snew
= this->convert_shortcut(block
, pshortcut
);
1642 block
->insert_statement_before(*pindex
, snew
);
1645 if (pshortcut
== &init
)
1646 vds
->var()->var_value()->set_init(init
);
1650 // Remove shortcut operators in the initializer of a global variable.
1653 Shortcuts::variable(Named_object
* no
)
1655 if (no
->is_result_variable())
1656 return TRAVERSE_CONTINUE
;
1657 Variable
* var
= no
->var_value();
1658 Expression
* init
= var
->init();
1659 if (!var
->is_global() || init
== NULL
)
1660 return TRAVERSE_CONTINUE
;
1664 Find_shortcut find_shortcut
;
1665 init
->traverse(&init
, &find_shortcut
);
1666 Expression
** pshortcut
= find_shortcut
.found();
1667 if (pshortcut
== NULL
)
1668 return TRAVERSE_CONTINUE
;
1670 Statement
* snew
= this->convert_shortcut(NULL
, pshortcut
);
1671 var
->add_preinit_statement(snew
);
1672 if (pshortcut
== &init
)
1673 var
->set_init(init
);
1677 // Given an expression which uses a shortcut operator, return a
1678 // statement which implements it, and update *PSHORTCUT accordingly.
1681 Shortcuts::convert_shortcut(Block
* enclosing
, Expression
** pshortcut
)
1683 Binary_expression
* shortcut
= (*pshortcut
)->binary_expression();
1684 Expression
* left
= shortcut
->left();
1685 Expression
* right
= shortcut
->right();
1686 source_location loc
= shortcut
->location();
1688 Block
* retblock
= new Block(enclosing
, loc
);
1689 retblock
->set_end_location(loc
);
1691 Temporary_statement
* ts
= Statement::make_temporary(Type::make_boolean_type(),
1693 retblock
->add_statement(ts
);
1695 Block
* block
= new Block(retblock
, loc
);
1696 block
->set_end_location(loc
);
1697 Expression
* tmpref
= Expression::make_temporary_reference(ts
, loc
);
1698 Statement
* assign
= Statement::make_assignment(tmpref
, right
, loc
);
1699 block
->add_statement(assign
);
1701 Expression
* cond
= Expression::make_temporary_reference(ts
, loc
);
1702 if (shortcut
->binary_expression()->op() == OPERATOR_OROR
)
1703 cond
= Expression::make_unary(OPERATOR_NOT
, cond
, loc
);
1705 Statement
* if_statement
= Statement::make_if_statement(cond
, block
, NULL
,
1707 retblock
->add_statement(if_statement
);
1709 *pshortcut
= Expression::make_temporary_reference(ts
, loc
);
1713 // Now convert any shortcut operators in LEFT and RIGHT.
1714 Shortcuts shortcuts
;
1715 retblock
->traverse(&shortcuts
);
1717 return Statement::make_block_statement(retblock
, loc
);
1720 // Turn shortcut operators into explicit if statements. Doing this
1721 // considerably simplifies the order of evaluation rules.
1724 Gogo::remove_shortcuts()
1726 Shortcuts shortcuts
;
1727 this->traverse(&shortcuts
);
1730 // A traversal class which finds all the expressions which must be
1731 // evaluated in order within a statement or larger expression. This
1732 // is used to implement the rules about order of evaluation.
1734 class Find_eval_ordering
: public Traverse
1737 typedef std::vector
<Expression
**> Expression_pointers
;
1740 Find_eval_ordering()
1741 : Traverse(traverse_blocks
1742 | traverse_statements
1743 | traverse_expressions
),
1749 { return this->exprs_
.size(); }
1751 typedef Expression_pointers::const_iterator const_iterator
;
1755 { return this->exprs_
.begin(); }
1759 { return this->exprs_
.end(); }
1764 { return TRAVERSE_SKIP_COMPONENTS
; }
1767 statement(Block
*, size_t*, Statement
*)
1768 { return TRAVERSE_SKIP_COMPONENTS
; }
1771 expression(Expression
**);
1774 // A list of pointers to expressions with side-effects.
1775 Expression_pointers exprs_
;
1778 // If an expression must be evaluated in order, put it on the list.
1781 Find_eval_ordering::expression(Expression
** expression_pointer
)
1783 // We have to look at subexpressions before this one.
1784 if ((*expression_pointer
)->traverse_subexpressions(this) == TRAVERSE_EXIT
)
1785 return TRAVERSE_EXIT
;
1786 if ((*expression_pointer
)->must_eval_in_order())
1787 this->exprs_
.push_back(expression_pointer
);
1788 return TRAVERSE_SKIP_COMPONENTS
;
1791 // A traversal class for ordering evaluations.
1793 class Order_eval
: public Traverse
1797 : Traverse(traverse_variables
1798 | traverse_statements
)
1802 variable(Named_object
*);
1805 statement(Block
*, size_t*, Statement
*);
1808 // Implement the order of evaluation rules for a statement.
1811 Order_eval::statement(Block
* block
, size_t* pindex
, Statement
* s
)
1813 // FIXME: This approach doesn't work for switch statements, because
1814 // we add the new statements before the whole switch when we need to
1815 // instead add them just before the switch expression. The right
1816 // fix is probably to lower switch statements with nonconstant cases
1817 // to a series of conditionals.
1818 if (s
->switch_statement() != NULL
)
1819 return TRAVERSE_CONTINUE
;
1821 Find_eval_ordering find_eval_ordering
;
1823 // If S is a variable declaration, then ordinary traversal won't do
1824 // anything. We want to explicitly traverse the initialization
1825 // expression if there is one.
1826 Variable_declaration_statement
* vds
= s
->variable_declaration_statement();
1827 Expression
* init
= NULL
;
1828 Expression
* orig_init
= NULL
;
1830 s
->traverse_contents(&find_eval_ordering
);
1833 init
= vds
->var()->var_value()->init();
1835 return TRAVERSE_CONTINUE
;
1838 // It might seem that this could be
1839 // init->traverse_subexpressions. Unfortunately that can fail
1842 // newvar, err := call(arg())
1843 // Here newvar will have an init of call result 0 of
1844 // call(arg()). If we only traverse subexpressions, we will
1845 // only find arg(), and we won't bother to move anything out.
1846 // Then we get to the assignment to err, we will traverse the
1847 // whole statement, and this time we will find both call() and
1848 // arg(), and so we will move them out. This will cause them to
1849 // be put into temporary variables before the assignment to err
1850 // but after the declaration of newvar. To avoid that problem,
1851 // we traverse the entire expression here.
1852 Expression::traverse(&init
, &find_eval_ordering
);
1855 if (find_eval_ordering
.size() <= 1)
1857 // If there is only one expression with a side-effect, we can
1858 // leave it in place.
1859 return TRAVERSE_CONTINUE
;
1862 bool is_thunk
= s
->thunk_statement() != NULL
;
1863 for (Find_eval_ordering::const_iterator p
= find_eval_ordering
.begin();
1864 p
!= find_eval_ordering
.end();
1867 Expression
** pexpr
= *p
;
1869 // If the last expression is a send or receive expression, we
1870 // may be ignoring the value; we don't want to evaluate it
1872 if (p
+ 1 == find_eval_ordering
.end()
1873 && ((*pexpr
)->classification() == Expression::EXPRESSION_SEND
1874 || (*pexpr
)->classification() == Expression::EXPRESSION_RECEIVE
))
1877 // The last expression in a thunk will be the call passed to go
1878 // or defer, which we must not evaluate early.
1879 if (is_thunk
&& p
+ 1 == find_eval_ordering
.end())
1882 source_location loc
= (*pexpr
)->location();
1883 Temporary_statement
* ts
= Statement::make_temporary(NULL
, *pexpr
, loc
);
1884 block
->insert_statement_before(*pindex
, ts
);
1887 *pexpr
= Expression::make_temporary_reference(ts
, loc
);
1890 if (init
!= orig_init
)
1891 vds
->var()->var_value()->set_init(init
);
1893 return TRAVERSE_CONTINUE
;
1896 // Implement the order of evaluation rules for the initializer of a
1900 Order_eval::variable(Named_object
* no
)
1902 if (no
->is_result_variable())
1903 return TRAVERSE_CONTINUE
;
1904 Variable
* var
= no
->var_value();
1905 Expression
* init
= var
->init();
1906 if (!var
->is_global() || init
== NULL
)
1907 return TRAVERSE_CONTINUE
;
1909 Find_eval_ordering find_eval_ordering
;
1910 init
->traverse_subexpressions(&find_eval_ordering
);
1912 if (find_eval_ordering
.size() <= 1)
1914 // If there is only one expression with a side-effect, we can
1915 // leave it in place.
1916 return TRAVERSE_SKIP_COMPONENTS
;
1919 for (Find_eval_ordering::const_iterator p
= find_eval_ordering
.begin();
1920 p
!= find_eval_ordering
.end();
1923 Expression
** pexpr
= *p
;
1924 source_location loc
= (*pexpr
)->location();
1925 Temporary_statement
* ts
= Statement::make_temporary(NULL
, *pexpr
, loc
);
1926 var
->add_preinit_statement(ts
);
1927 *pexpr
= Expression::make_temporary_reference(ts
, loc
);
1930 return TRAVERSE_SKIP_COMPONENTS
;
1933 // Use temporary variables to implement the order of evaluation rules.
1936 Gogo::order_evaluations()
1938 Order_eval order_eval
;
1939 this->traverse(&order_eval
);
1942 // Traversal to convert calls to the predeclared recover function to
1943 // pass in an argument indicating whether it can recover from a panic
1946 class Convert_recover
: public Traverse
1949 Convert_recover(Named_object
* arg
)
1950 : Traverse(traverse_expressions
),
1956 expression(Expression
**);
1959 // The argument to pass to the function.
1963 // Convert calls to recover.
1966 Convert_recover::expression(Expression
** pp
)
1968 Call_expression
* ce
= (*pp
)->call_expression();
1969 if (ce
!= NULL
&& ce
->is_recover_call())
1970 ce
->set_recover_arg(Expression::make_var_reference(this->arg_
,
1972 return TRAVERSE_CONTINUE
;
1975 // Traversal for build_recover_thunks.
1977 class Build_recover_thunks
: public Traverse
1980 Build_recover_thunks(Gogo
* gogo
)
1981 : Traverse(traverse_functions
),
1986 function(Named_object
*);
1990 can_recover_arg(source_location
);
1996 // If this function calls recover, turn it into a thunk.
1999 Build_recover_thunks::function(Named_object
* orig_no
)
2001 Function
* orig_func
= orig_no
->func_value();
2002 if (!orig_func
->calls_recover()
2003 || orig_func
->is_recover_thunk()
2004 || orig_func
->has_recover_thunk())
2005 return TRAVERSE_CONTINUE
;
2007 Gogo
* gogo
= this->gogo_
;
2008 source_location location
= orig_func
->location();
2013 Function_type
* orig_fntype
= orig_func
->type();
2014 Typed_identifier_list
* new_params
= new Typed_identifier_list();
2015 std::string receiver_name
;
2016 if (orig_fntype
->is_method())
2018 const Typed_identifier
* receiver
= orig_fntype
->receiver();
2019 snprintf(buf
, sizeof buf
, "rt.%u", count
);
2021 receiver_name
= buf
;
2022 new_params
->push_back(Typed_identifier(receiver_name
, receiver
->type(),
2023 receiver
->location()));
2025 const Typed_identifier_list
* orig_params
= orig_fntype
->parameters();
2026 if (orig_params
!= NULL
&& !orig_params
->empty())
2028 for (Typed_identifier_list::const_iterator p
= orig_params
->begin();
2029 p
!= orig_params
->end();
2032 snprintf(buf
, sizeof buf
, "pt.%u", count
);
2034 new_params
->push_back(Typed_identifier(buf
, p
->type(),
2038 snprintf(buf
, sizeof buf
, "pr.%u", count
);
2040 std::string can_recover_name
= buf
;
2041 new_params
->push_back(Typed_identifier(can_recover_name
,
2042 Type::make_boolean_type(),
2043 orig_fntype
->location()));
2045 const Typed_identifier_list
* orig_results
= orig_fntype
->results();
2046 Typed_identifier_list
* new_results
;
2047 if (orig_results
== NULL
|| orig_results
->empty())
2051 new_results
= new Typed_identifier_list();
2052 for (Typed_identifier_list::const_iterator p
= orig_results
->begin();
2053 p
!= orig_results
->end();
2055 new_results
->push_back(*p
);
2058 Function_type
*new_fntype
= Type::make_function_type(NULL
, new_params
,
2060 orig_fntype
->location());
2061 if (orig_fntype
->is_varargs())
2062 new_fntype
->set_is_varargs();
2064 std::string name
= orig_no
->name() + "$recover";
2065 Named_object
*new_no
= gogo
->start_function(name
, new_fntype
, false,
2067 Function
*new_func
= new_no
->func_value();
2068 if (orig_func
->enclosing() != NULL
)
2069 new_func
->set_enclosing(orig_func
->enclosing());
2071 // We build the code for the original function attached to the new
2072 // function, and then swap the original and new function bodies.
2073 // This means that existing references to the original function will
2074 // then refer to the new function. That makes this code a little
2075 // confusing, in that the reference to NEW_NO really refers to the
2076 // other function, not the one we are building.
2078 Expression
* closure
= NULL
;
2079 if (orig_func
->needs_closure())
2081 Named_object
* orig_closure_no
= orig_func
->closure_var();
2082 Variable
* orig_closure_var
= orig_closure_no
->var_value();
2083 Variable
* new_var
= new Variable(orig_closure_var
->type(), NULL
, false,
2084 true, false, location
);
2085 snprintf(buf
, sizeof buf
, "closure.%u", count
);
2087 Named_object
* new_closure_no
= Named_object::make_variable(buf
, NULL
,
2089 new_func
->set_closure_var(new_closure_no
);
2090 closure
= Expression::make_var_reference(new_closure_no
, location
);
2093 Expression
* fn
= Expression::make_func_reference(new_no
, closure
, location
);
2095 Expression_list
* args
= new Expression_list();
2096 if (orig_fntype
->is_method())
2098 Named_object
* rec_no
= gogo
->lookup(receiver_name
, NULL
);
2099 gcc_assert(rec_no
!= NULL
2100 && rec_no
->is_variable()
2101 && rec_no
->var_value()->is_parameter());
2102 args
->push_back(Expression::make_var_reference(rec_no
, location
));
2104 if (new_params
!= NULL
)
2106 // Note that we skip the last parameter, which is the boolean
2107 // indicating whether recover can succed.
2108 for (Typed_identifier_list::const_iterator p
= new_params
->begin();
2109 p
+ 1 != new_params
->end();
2112 Named_object
* p_no
= gogo
->lookup(p
->name(), NULL
);
2113 gcc_assert(p_no
!= NULL
2114 && p_no
->is_variable()
2115 && p_no
->var_value()->is_parameter());
2116 args
->push_back(Expression::make_var_reference(p_no
, location
));
2119 args
->push_back(this->can_recover_arg(location
));
2121 Expression
* call
= Expression::make_call(fn
, args
, false, location
);
2124 if (orig_fntype
->results() == NULL
|| orig_fntype
->results()->empty())
2125 s
= Statement::make_statement(call
);
2128 Expression_list
* vals
= new Expression_list();
2129 vals
->push_back(call
);
2130 s
= Statement::make_return_statement(new_func
->type()->results(),
2133 s
->determine_types();
2134 gogo
->add_statement(s
);
2136 gogo
->finish_function(location
);
2138 // Swap the function bodies and types.
2139 new_func
->swap_for_recover(orig_func
);
2140 orig_func
->set_is_recover_thunk();
2141 new_func
->set_calls_recover();
2142 new_func
->set_has_recover_thunk();
2144 Bindings
* orig_bindings
= orig_func
->block()->bindings();
2145 Bindings
* new_bindings
= new_func
->block()->bindings();
2146 if (orig_fntype
->is_method())
2148 // We changed the receiver to be a regular parameter. We have
2149 // to update the binding accordingly in both functions.
2150 Named_object
* orig_rec_no
= orig_bindings
->lookup_local(receiver_name
);
2151 gcc_assert(orig_rec_no
!= NULL
2152 && orig_rec_no
->is_variable()
2153 && !orig_rec_no
->var_value()->is_receiver());
2154 orig_rec_no
->var_value()->set_is_receiver();
2156 Named_object
* new_rec_no
= new_bindings
->lookup_local(receiver_name
);
2157 gcc_assert(new_rec_no
!= NULL
2158 && new_rec_no
->is_variable()
2159 && !new_rec_no
->var_value()->is_receiver());
2160 new_rec_no
->var_value()->set_is_not_receiver();
2163 // Because we flipped blocks but not types, the can_recover
2164 // parameter appears in the (now) old bindings as a parameter.
2165 // Change it to a local variable, whereupon it will be discarded.
2166 Named_object
* can_recover_no
= orig_bindings
->lookup_local(can_recover_name
);
2167 gcc_assert(can_recover_no
!= NULL
2168 && can_recover_no
->is_variable()
2169 && can_recover_no
->var_value()->is_parameter());
2170 orig_bindings
->remove_binding(can_recover_no
);
2172 // Add the can_recover argument to the (now) new bindings, and
2173 // attach it to any recover statements.
2174 Variable
* can_recover_var
= new Variable(Type::make_boolean_type(), NULL
,
2175 false, true, false, location
);
2176 can_recover_no
= new_bindings
->add_variable(can_recover_name
, NULL
,
2178 Convert_recover
convert_recover(can_recover_no
);
2179 new_func
->traverse(&convert_recover
);
2181 return TRAVERSE_CONTINUE
;
2184 // Return the expression to pass for the .can_recover parameter to the
2185 // new function. This indicates whether a call to recover may return
2186 // non-nil. The expression is
2187 // __go_can_recover(__builtin_return_address()).
2190 Build_recover_thunks::can_recover_arg(source_location location
)
2192 static Named_object
* builtin_return_address
;
2193 if (builtin_return_address
== NULL
)
2195 const source_location bloc
= BUILTINS_LOCATION
;
2197 Typed_identifier_list
* param_types
= new Typed_identifier_list();
2198 Type
* uint_type
= Type::lookup_integer_type("uint");
2199 param_types
->push_back(Typed_identifier("l", uint_type
, bloc
));
2201 Typed_identifier_list
* return_types
= new Typed_identifier_list();
2202 Type
* voidptr_type
= Type::make_pointer_type(Type::make_void_type());
2203 return_types
->push_back(Typed_identifier("", voidptr_type
, bloc
));
2205 Function_type
* fntype
= Type::make_function_type(NULL
, param_types
,
2206 return_types
, bloc
);
2207 builtin_return_address
=
2208 Named_object::make_function_declaration("__builtin_return_address",
2209 NULL
, fntype
, bloc
);
2210 const char* n
= "__builtin_return_address";
2211 builtin_return_address
->func_declaration_value()->set_asm_name(n
);
2214 static Named_object
* can_recover
;
2215 if (can_recover
== NULL
)
2217 const source_location bloc
= BUILTINS_LOCATION
;
2218 Typed_identifier_list
* param_types
= new Typed_identifier_list();
2219 Type
* voidptr_type
= Type::make_pointer_type(Type::make_void_type());
2220 param_types
->push_back(Typed_identifier("a", voidptr_type
, bloc
));
2221 Type
* boolean_type
= Type::make_boolean_type();
2222 Typed_identifier_list
* results
= new Typed_identifier_list();
2223 results
->push_back(Typed_identifier("", boolean_type
, bloc
));
2224 Function_type
* fntype
= Type::make_function_type(NULL
, param_types
,
2226 can_recover
= Named_object::make_function_declaration("__go_can_recover",
2229 can_recover
->func_declaration_value()->set_asm_name("__go_can_recover");
2232 Expression
* fn
= Expression::make_func_reference(builtin_return_address
,
2236 mpz_init_set_ui(zval
, 0UL);
2237 Expression
* zexpr
= Expression::make_integer(&zval
, NULL
, location
);
2239 Expression_list
*args
= new Expression_list();
2240 args
->push_back(zexpr
);
2242 Expression
* call
= Expression::make_call(fn
, args
, false, location
);
2244 args
= new Expression_list();
2245 args
->push_back(call
);
2247 fn
= Expression::make_func_reference(can_recover
, NULL
, location
);
2248 return Expression::make_call(fn
, args
, false, location
);
2251 // Build thunks for functions which call recover. We build a new
2252 // function with an extra parameter, which is whether a call to
2253 // recover can succeed. We then move the body of this function to
2254 // that one. We then turn this function into a thunk which calls the
2255 // new one, passing the value of
2256 // __go_can_recover(__builtin_return_address()). The function will be
2257 // marked as not splitting the stack. This will cooperate with the
2258 // implementation of defer to make recover do the right thing.
2261 Gogo::build_recover_thunks()
2263 Build_recover_thunks
build_recover_thunks(this);
2264 this->traverse(&build_recover_thunks
);
2267 // Look for named types to see whether we need to create an interface
2270 class Build_method_tables
: public Traverse
2273 Build_method_tables(Gogo
* gogo
,
2274 const std::vector
<Interface_type
*>& interfaces
)
2275 : Traverse(traverse_types
),
2276 gogo_(gogo
), interfaces_(interfaces
)
2285 // A list of locally defined interfaces which have hidden methods.
2286 const std::vector
<Interface_type
*>& interfaces_
;
2289 // Build all required interface method tables for types. We need to
2290 // ensure that we have an interface method table for every interface
2291 // which has a hidden method, for every named type which implements
2292 // that interface. Normally we can just build interface method tables
2293 // as we need them. However, in some cases we can require an
2294 // interface method table for an interface defined in a different
2295 // package for a type defined in that package. If that interface and
2296 // type both use a hidden method, that is OK. However, we will not be
2297 // able to build that interface method table when we need it, because
2298 // the type's hidden method will be static. So we have to build it
2299 // here, and just refer it from other packages as needed.
2302 Gogo::build_interface_method_tables()
2304 std::vector
<Interface_type
*> hidden_interfaces
;
2305 hidden_interfaces
.reserve(this->interface_types_
.size());
2306 for (std::vector
<Interface_type
*>::const_iterator pi
=
2307 this->interface_types_
.begin();
2308 pi
!= this->interface_types_
.end();
2311 const Typed_identifier_list
* methods
= (*pi
)->methods();
2312 if (methods
== NULL
)
2314 for (Typed_identifier_list::const_iterator pm
= methods
->begin();
2315 pm
!= methods
->end();
2318 if (Gogo::is_hidden_name(pm
->name()))
2320 hidden_interfaces
.push_back(*pi
);
2326 if (!hidden_interfaces
.empty())
2328 // Now traverse the tree looking for all named types.
2329 Build_method_tables
bmt(this, hidden_interfaces
);
2330 this->traverse(&bmt
);
2333 // We no longer need the list of interfaces.
2335 this->interface_types_
.clear();
2338 // This is called for each type. For a named type, for each of the
2339 // interfaces with hidden methods that it implements, create the
2343 Build_method_tables::type(Type
* type
)
2345 Named_type
* nt
= type
->named_type();
2348 for (std::vector
<Interface_type
*>::const_iterator p
=
2349 this->interfaces_
.begin();
2350 p
!= this->interfaces_
.end();
2353 // We ask whether a pointer to the named type implements the
2354 // interface, because a pointer can implement more methods
2356 if ((*p
)->implements_interface(Type::make_pointer_type(nt
), NULL
))
2358 nt
->interface_method_table(this->gogo_
, *p
, false);
2359 nt
->interface_method_table(this->gogo_
, *p
, true);
2363 return TRAVERSE_CONTINUE
;
2366 // Traversal class used to check for return statements.
2368 class Check_return_statements_traverse
: public Traverse
2371 Check_return_statements_traverse()
2372 : Traverse(traverse_functions
)
2376 function(Named_object
*);
2379 // Check that a function has a return statement if it needs one.
2382 Check_return_statements_traverse::function(Named_object
* no
)
2384 Function
* func
= no
->func_value();
2385 const Function_type
* fntype
= func
->type();
2386 const Typed_identifier_list
* results
= fntype
->results();
2388 // We only need a return statement if there is a return value.
2389 if (results
== NULL
|| results
->empty())
2390 return TRAVERSE_CONTINUE
;
2392 if (func
->block()->may_fall_through())
2393 error_at(func
->location(), "control reaches end of non-void function");
2395 return TRAVERSE_CONTINUE
;
2398 // Check return statements.
2401 Gogo::check_return_statements()
2403 Check_return_statements_traverse traverse
;
2404 this->traverse(&traverse
);
2407 // Get the unique prefix to use before all exported symbols. This
2408 // must be unique across the entire link.
2411 Gogo::unique_prefix() const
2413 gcc_assert(!this->unique_prefix_
.empty());
2414 return this->unique_prefix_
;
2417 // Set the unique prefix to use before all exported symbols. This
2418 // comes from the command line option -fgo-prefix=XXX.
2421 Gogo::set_unique_prefix(const std::string
& arg
)
2423 gcc_assert(this->unique_prefix_
.empty());
2424 this->unique_prefix_
= arg
;
2427 // Work out the package priority. It is one more than the maximum
2428 // priority of an imported package.
2431 Gogo::package_priority() const
2434 for (Packages::const_iterator p
= this->packages_
.begin();
2435 p
!= this->packages_
.end();
2437 if (p
->second
->priority() > priority
)
2438 priority
= p
->second
->priority();
2439 return priority
+ 1;
2442 // Export identifiers as requested.
2447 // For now we always stream to a section. Later we may want to
2448 // support streaming to a separate file.
2449 Stream_to_section stream
;
2451 Export
exp(&stream
);
2452 exp
.register_builtin_types(this);
2453 exp
.export_globals(this->package_name(),
2454 this->unique_prefix(),
2455 this->package_priority(),
2456 (this->need_init_fn_
&& this->package_name() != "main"
2457 ? this->get_init_fn_name()
2459 this->imported_init_fns_
,
2460 this->package_
->bindings());
2465 Function::Function(Function_type
* type
, Function
* enclosing
, Block
* block
,
2466 source_location location
)
2467 : type_(type
), enclosing_(enclosing
), named_results_(NULL
),
2468 closure_var_(NULL
), block_(block
), location_(location
), fndecl_(NULL
),
2469 defer_stack_(NULL
), calls_recover_(false), is_recover_thunk_(false),
2470 has_recover_thunk_(false)
2474 // Create the named result variables.
2477 Function::create_named_result_variables(Gogo
* gogo
)
2479 const Typed_identifier_list
* results
= this->type_
->results();
2482 || results
->front().name().empty())
2485 this->named_results_
= new Named_results();
2486 this->named_results_
->reserve(results
->size());
2488 Block
* block
= this->block_
;
2490 for (Typed_identifier_list::const_iterator p
= results
->begin();
2491 p
!= results
->end();
2494 std::string name
= p
->name();
2495 if (Gogo::is_sink_name(name
))
2497 static int unnamed_result_counter
;
2499 snprintf(buf
, sizeof buf
, "_$%d", unnamed_result_counter
);
2500 ++unnamed_result_counter
;
2501 name
= gogo
->pack_hidden_name(buf
, false);
2503 Result_variable
* result
= new Result_variable(p
->type(), this, index
);
2504 Named_object
* no
= block
->bindings()->add_result_variable(name
, result
);
2505 this->named_results_
->push_back(no
);
2509 // Return the closure variable, creating it if necessary.
2512 Function::closure_var()
2514 if (this->closure_var_
== NULL
)
2516 // We don't know the type of the variable yet. We add fields as
2518 source_location loc
= this->type_
->location();
2519 Struct_field_list
* sfl
= new Struct_field_list
;
2520 Type
* struct_type
= Type::make_struct_type(sfl
, loc
);
2521 Variable
* var
= new Variable(Type::make_pointer_type(struct_type
),
2522 NULL
, false, true, false, loc
);
2523 this->closure_var_
= Named_object::make_variable("closure", NULL
, var
);
2524 // Note that the new variable is not in any binding contour.
2526 return this->closure_var_
;
2529 // Set the type of the closure variable.
2532 Function::set_closure_type()
2534 if (this->closure_var_
== NULL
)
2536 Named_object
* closure
= this->closure_var_
;
2537 Struct_type
* st
= closure
->var_value()->type()->deref()->struct_type();
2538 unsigned int index
= 0;
2539 for (Closure_fields::const_iterator p
= this->closure_fields_
.begin();
2540 p
!= this->closure_fields_
.end();
2543 Named_object
* no
= p
->first
;
2545 snprintf(buf
, sizeof buf
, "%u", index
);
2546 std::string n
= no
->name() + buf
;
2548 if (no
->is_variable())
2549 var_type
= no
->var_value()->type();
2551 var_type
= no
->result_var_value()->type();
2552 Type
* field_type
= Type::make_pointer_type(var_type
);
2553 st
->push_field(Struct_field(Typed_identifier(n
, field_type
, p
->second
)));
2557 // Return whether this function is a method.
2560 Function::is_method() const
2562 return this->type_
->is_method();
2565 // Add a label definition.
2568 Function::add_label_definition(const std::string
& label_name
,
2569 source_location location
)
2571 Label
* lnull
= NULL
;
2572 std::pair
<Labels::iterator
, bool> ins
=
2573 this->labels_
.insert(std::make_pair(label_name
, lnull
));
2576 // This is a new label.
2577 Label
* label
= new Label(label_name
);
2578 label
->define(location
);
2579 ins
.first
->second
= label
;
2584 // The label was already in the hash table.
2585 Label
* label
= ins
.first
->second
;
2586 if (!label
->is_defined())
2588 label
->define(location
);
2593 error_at(location
, "redefinition of label %qs",
2594 Gogo::message_name(label_name
).c_str());
2595 inform(label
->location(), "previous definition of %qs was here",
2596 Gogo::message_name(label_name
).c_str());
2597 return new Label(label_name
);
2602 // Add a reference to a label.
2605 Function::add_label_reference(const std::string
& label_name
)
2607 Label
* lnull
= NULL
;
2608 std::pair
<Labels::iterator
, bool> ins
=
2609 this->labels_
.insert(std::make_pair(label_name
, lnull
));
2612 // The label was already in the hash table.
2613 return ins
.first
->second
;
2617 gcc_assert(ins
.first
->second
== NULL
);
2618 Label
* label
= new Label(label_name
);
2619 ins
.first
->second
= label
;
2624 // Swap one function with another. This is used when building the
2625 // thunk we use to call a function which calls recover. It may not
2626 // work for any other case.
2629 Function::swap_for_recover(Function
*x
)
2631 gcc_assert(this->enclosing_
== x
->enclosing_
);
2632 gcc_assert(this->named_results_
== x
->named_results_
);
2633 std::swap(this->closure_var_
, x
->closure_var_
);
2634 std::swap(this->block_
, x
->block_
);
2635 gcc_assert(this->location_
== x
->location_
);
2636 gcc_assert(this->fndecl_
== NULL
&& x
->fndecl_
== NULL
);
2637 gcc_assert(this->defer_stack_
== NULL
&& x
->defer_stack_
== NULL
);
2640 // Traverse the tree.
2643 Function::traverse(Traverse
* traverse
)
2645 unsigned int traverse_mask
= traverse
->traverse_mask();
2647 // FIXME: We should check traverse_functions here if nested
2648 // functions are stored in block bindings.
2649 if (this->block_
!= NULL
2651 & (Traverse::traverse_variables
2652 | Traverse::traverse_constants
2653 | Traverse::traverse_blocks
2654 | Traverse::traverse_statements
2655 | Traverse::traverse_expressions
2656 | Traverse::traverse_types
)) != 0)
2658 if (this->block_
->traverse(traverse
) == TRAVERSE_EXIT
)
2659 return TRAVERSE_EXIT
;
2662 return TRAVERSE_CONTINUE
;
2665 // Work out types for unspecified variables and constants.
2668 Function::determine_types()
2670 if (this->block_
!= NULL
)
2671 this->block_
->determine_types();
2674 // Export the function.
2677 Function::export_func(Export
* exp
, const std::string
& name
) const
2679 Function::export_func_with_type(exp
, name
, this->type_
);
2682 // Export a function with a type.
2685 Function::export_func_with_type(Export
* exp
, const std::string
& name
,
2686 const Function_type
* fntype
)
2688 exp
->write_c_string("func ");
2690 if (fntype
->is_method())
2692 exp
->write_c_string("(");
2693 exp
->write_type(fntype
->receiver()->type());
2694 exp
->write_c_string(") ");
2697 exp
->write_string(name
);
2699 exp
->write_c_string(" (");
2700 const Typed_identifier_list
* parameters
= fntype
->parameters();
2701 if (parameters
!= NULL
)
2703 bool is_varargs
= fntype
->is_varargs();
2705 for (Typed_identifier_list::const_iterator p
= parameters
->begin();
2706 p
!= parameters
->end();
2712 exp
->write_c_string(", ");
2713 if (!is_varargs
|| p
+ 1 != parameters
->end())
2714 exp
->write_type(p
->type());
2717 exp
->write_c_string("...");
2718 exp
->write_type(p
->type()->array_type()->element_type());
2722 exp
->write_c_string(")");
2724 const Typed_identifier_list
* results
= fntype
->results();
2725 if (results
!= NULL
)
2727 if (results
->size() == 1)
2729 exp
->write_c_string(" ");
2730 exp
->write_type(results
->begin()->type());
2734 exp
->write_c_string(" (");
2736 for (Typed_identifier_list::const_iterator p
= results
->begin();
2737 p
!= results
->end();
2743 exp
->write_c_string(", ");
2744 exp
->write_type(p
->type());
2746 exp
->write_c_string(")");
2749 exp
->write_c_string(";\n");
2752 // Import a function.
2755 Function::import_func(Import
* imp
, std::string
* pname
,
2756 Typed_identifier
** preceiver
,
2757 Typed_identifier_list
** pparameters
,
2758 Typed_identifier_list
** presults
,
2761 imp
->require_c_string("func ");
2764 if (imp
->peek_char() == '(')
2766 imp
->require_c_string("(");
2767 Type
* rtype
= imp
->read_type();
2768 *preceiver
= new Typed_identifier(Import::import_marker
, rtype
,
2770 imp
->require_c_string(") ");
2773 *pname
= imp
->read_identifier();
2775 Typed_identifier_list
* parameters
;
2776 *is_varargs
= false;
2777 imp
->require_c_string(" (");
2778 if (imp
->peek_char() == ')')
2782 parameters
= new Typed_identifier_list();
2785 if (imp
->match_c_string("..."))
2791 Type
* ptype
= imp
->read_type();
2793 ptype
= Type::make_array_type(ptype
, NULL
);
2794 parameters
->push_back(Typed_identifier(Import::import_marker
,
2795 ptype
, imp
->location()));
2796 if (imp
->peek_char() != ',')
2798 gcc_assert(!*is_varargs
);
2799 imp
->require_c_string(", ");
2802 imp
->require_c_string(")");
2803 *pparameters
= parameters
;
2805 Typed_identifier_list
* results
;
2806 if (imp
->peek_char() != ' ')
2810 results
= new Typed_identifier_list();
2811 imp
->require_c_string(" ");
2812 if (imp
->peek_char() != '(')
2814 Type
* rtype
= imp
->read_type();
2815 results
->push_back(Typed_identifier(Import::import_marker
, rtype
,
2820 imp
->require_c_string("(");
2823 Type
* rtype
= imp
->read_type();
2824 results
->push_back(Typed_identifier(Import::import_marker
,
2825 rtype
, imp
->location()));
2826 if (imp
->peek_char() != ',')
2828 imp
->require_c_string(", ");
2830 imp
->require_c_string(")");
2833 imp
->require_c_string(";\n");
2834 *presults
= results
;
2839 Block::Block(Block
* enclosing
, source_location location
)
2840 : enclosing_(enclosing
), statements_(),
2841 bindings_(new Bindings(enclosing
== NULL
2843 : enclosing
->bindings())),
2844 start_location_(location
),
2845 end_location_(UNKNOWN_LOCATION
)
2849 // Add a statement to a block.
2852 Block::add_statement(Statement
* statement
)
2854 this->statements_
.push_back(statement
);
2857 // Add a statement to the front of a block. This is slow but is only
2858 // used for reference counts of parameters.
2861 Block::add_statement_at_front(Statement
* statement
)
2863 this->statements_
.insert(this->statements_
.begin(), statement
);
2866 // Replace a statement in a block.
2869 Block::replace_statement(size_t index
, Statement
* s
)
2871 gcc_assert(index
< this->statements_
.size());
2872 this->statements_
[index
] = s
;
2875 // Add a statement before another statement.
2878 Block::insert_statement_before(size_t index
, Statement
* s
)
2880 gcc_assert(index
< this->statements_
.size());
2881 this->statements_
.insert(this->statements_
.begin() + index
, s
);
2884 // Add a statement after another statement.
2887 Block::insert_statement_after(size_t index
, Statement
* s
)
2889 gcc_assert(index
< this->statements_
.size());
2890 this->statements_
.insert(this->statements_
.begin() + index
+ 1, s
);
2893 // Traverse the tree.
2896 Block::traverse(Traverse
* traverse
)
2898 unsigned int traverse_mask
= traverse
->traverse_mask();
2900 if ((traverse_mask
& Traverse::traverse_blocks
) != 0)
2902 int t
= traverse
->block(this);
2903 if (t
== TRAVERSE_EXIT
)
2904 return TRAVERSE_EXIT
;
2905 else if (t
== TRAVERSE_SKIP_COMPONENTS
)
2906 return TRAVERSE_CONTINUE
;
2910 & (Traverse::traverse_variables
2911 | Traverse::traverse_constants
2912 | Traverse::traverse_expressions
2913 | Traverse::traverse_types
)) != 0)
2915 for (Bindings::const_definitions_iterator pb
=
2916 this->bindings_
->begin_definitions();
2917 pb
!= this->bindings_
->end_definitions();
2920 switch ((*pb
)->classification())
2922 case Named_object::NAMED_OBJECT_CONST
:
2923 if ((traverse_mask
& Traverse::traverse_constants
) != 0)
2925 if (traverse
->constant(*pb
, false) == TRAVERSE_EXIT
)
2926 return TRAVERSE_EXIT
;
2928 if ((traverse_mask
& Traverse::traverse_types
) != 0
2929 || (traverse_mask
& Traverse::traverse_expressions
) != 0)
2931 Type
* t
= (*pb
)->const_value()->type();
2933 && Type::traverse(t
, traverse
) == TRAVERSE_EXIT
)
2934 return TRAVERSE_EXIT
;
2936 if ((traverse_mask
& Traverse::traverse_expressions
) != 0
2937 || (traverse_mask
& Traverse::traverse_types
) != 0)
2939 if ((*pb
)->const_value()->traverse_expression(traverse
)
2941 return TRAVERSE_EXIT
;
2945 case Named_object::NAMED_OBJECT_VAR
:
2946 case Named_object::NAMED_OBJECT_RESULT_VAR
:
2947 if ((traverse_mask
& Traverse::traverse_variables
) != 0)
2949 if (traverse
->variable(*pb
) == TRAVERSE_EXIT
)
2950 return TRAVERSE_EXIT
;
2952 if (((traverse_mask
& Traverse::traverse_types
) != 0
2953 || (traverse_mask
& Traverse::traverse_expressions
) != 0)
2954 && ((*pb
)->is_result_variable()
2955 || (*pb
)->var_value()->has_type()))
2957 Type
* t
= ((*pb
)->is_variable()
2958 ? (*pb
)->var_value()->type()
2959 : (*pb
)->result_var_value()->type());
2961 && Type::traverse(t
, traverse
) == TRAVERSE_EXIT
)
2962 return TRAVERSE_EXIT
;
2964 if ((*pb
)->is_variable()
2965 && ((traverse_mask
& Traverse::traverse_expressions
) != 0
2966 || (traverse_mask
& Traverse::traverse_types
) != 0))
2968 if ((*pb
)->var_value()->traverse_expression(traverse
)
2970 return TRAVERSE_EXIT
;
2974 case Named_object::NAMED_OBJECT_FUNC
:
2975 case Named_object::NAMED_OBJECT_FUNC_DECLARATION
:
2976 // FIXME: Where will nested functions be found?
2979 case Named_object::NAMED_OBJECT_TYPE
:
2980 if ((traverse_mask
& Traverse::traverse_types
) != 0
2981 || (traverse_mask
& Traverse::traverse_expressions
) != 0)
2983 if (Type::traverse((*pb
)->type_value(), traverse
)
2985 return TRAVERSE_EXIT
;
2989 case Named_object::NAMED_OBJECT_TYPE_DECLARATION
:
2990 case Named_object::NAMED_OBJECT_UNKNOWN
:
2993 case Named_object::NAMED_OBJECT_PACKAGE
:
2994 case Named_object::NAMED_OBJECT_SINK
:
3003 // No point in checking traverse_mask here--if we got here we always
3004 // want to walk the statements. The traversal can insert new
3005 // statements before or after the current statement. Inserting
3006 // statements before the current statement requires updating I via
3007 // the pointer; those statements will not be traversed. Any new
3008 // statements inserted after the current statement will be traversed
3010 for (size_t i
= 0; i
< this->statements_
.size(); ++i
)
3012 if (this->statements_
[i
]->traverse(this, &i
, traverse
) == TRAVERSE_EXIT
)
3013 return TRAVERSE_EXIT
;
3016 return TRAVERSE_CONTINUE
;
3019 // Work out types for unspecified variables and constants.
3022 Block::determine_types()
3024 for (Bindings::const_definitions_iterator pb
=
3025 this->bindings_
->begin_definitions();
3026 pb
!= this->bindings_
->end_definitions();
3029 if ((*pb
)->is_variable())
3030 (*pb
)->var_value()->determine_type();
3031 else if ((*pb
)->is_const())
3032 (*pb
)->const_value()->determine_type();
3035 for (std::vector
<Statement
*>::const_iterator ps
= this->statements_
.begin();
3036 ps
!= this->statements_
.end();
3038 (*ps
)->determine_types();
3041 // Return true if the statements in this block may fall through.
3044 Block::may_fall_through() const
3046 if (this->statements_
.empty())
3048 return this->statements_
.back()->may_fall_through();
3053 Variable::Variable(Type
* type
, Expression
* init
, bool is_global
,
3054 bool is_parameter
, bool is_receiver
,
3055 source_location location
)
3056 : type_(type
), init_(init
), preinit_(NULL
), location_(location
),
3057 is_global_(is_global
), is_parameter_(is_parameter
),
3058 is_receiver_(is_receiver
), is_varargs_parameter_(false),
3059 is_address_taken_(false), seen_(false), init_is_lowered_(false),
3060 type_from_init_tuple_(false), type_from_range_index_(false),
3061 type_from_range_value_(false), type_from_chan_element_(false),
3062 is_type_switch_var_(false)
3064 gcc_assert(type
!= NULL
|| init
!= NULL
);
3065 gcc_assert(!is_parameter
|| init
== NULL
);
3068 // Traverse the initializer expression.
3071 Variable::traverse_expression(Traverse
* traverse
)
3073 if (this->preinit_
!= NULL
)
3075 if (this->preinit_
->traverse(traverse
) == TRAVERSE_EXIT
)
3076 return TRAVERSE_EXIT
;
3078 if (this->init_
!= NULL
)
3080 if (Expression::traverse(&this->init_
, traverse
) == TRAVERSE_EXIT
)
3081 return TRAVERSE_EXIT
;
3083 return TRAVERSE_CONTINUE
;
3086 // Lower the initialization expression after parsing is complete.
3089 Variable::lower_init_expression(Gogo
* gogo
, Named_object
* function
)
3091 if (this->init_
!= NULL
&& !this->init_is_lowered_
)
3095 // We will give an error elsewhere, this is just to prevent
3096 // an infinite loop.
3101 gogo
->lower_expression(function
, &this->init_
);
3103 this->seen_
= false;
3105 this->init_is_lowered_
= true;
3109 // Get the preinit block.
3112 Variable::preinit_block()
3114 gcc_assert(this->is_global_
);
3115 if (this->preinit_
== NULL
)
3116 this->preinit_
= new Block(NULL
, this->location());
3117 return this->preinit_
;
3120 // Add a statement to be run before the initialization expression.
3123 Variable::add_preinit_statement(Statement
* s
)
3125 Block
* b
= this->preinit_block();
3126 b
->add_statement(s
);
3127 b
->set_end_location(s
->location());
3130 // In an assignment which sets a variable to a tuple of EXPR, return
3131 // the type of the first element of the tuple.
3134 Variable::type_from_tuple(Expression
* expr
, bool report_error
) const
3136 if (expr
->map_index_expression() != NULL
)
3137 return expr
->map_index_expression()->get_map_type()->val_type();
3138 else if (expr
->receive_expression() != NULL
)
3140 Expression
* channel
= expr
->receive_expression()->channel();
3141 Type
* channel_type
= channel
->type();
3142 if (channel_type
->is_error_type())
3143 return Type::make_error_type();
3144 return channel_type
->channel_type()->element_type();
3149 error_at(this->location(), "invalid tuple definition");
3150 return Type::make_error_type();
3154 // Given EXPR used in a range clause, return either the index type or
3155 // the value type of the range, depending upon GET_INDEX_TYPE.
3158 Variable::type_from_range(Expression
* expr
, bool get_index_type
,
3159 bool report_error
) const
3161 Type
* t
= expr
->type();
3162 if (t
->array_type() != NULL
3163 || (t
->points_to() != NULL
3164 && t
->points_to()->array_type() != NULL
3165 && !t
->points_to()->is_open_array_type()))
3168 return Type::lookup_integer_type("int");
3170 return t
->deref()->array_type()->element_type();
3172 else if (t
->is_string_type())
3173 return Type::lookup_integer_type("int");
3174 else if (t
->map_type() != NULL
)
3177 return t
->map_type()->key_type();
3179 return t
->map_type()->val_type();
3181 else if (t
->channel_type() != NULL
)
3184 return t
->channel_type()->element_type();
3188 error_at(this->location(),
3189 "invalid definition of value variable for channel range");
3190 return Type::make_error_type();
3196 error_at(this->location(), "invalid type for range clause");
3197 return Type::make_error_type();
3201 // EXPR should be a channel. Return the channel's element type.
3204 Variable::type_from_chan_element(Expression
* expr
, bool report_error
) const
3206 Type
* t
= expr
->type();
3207 if (t
->channel_type() != NULL
)
3208 return t
->channel_type()->element_type();
3212 error_at(this->location(), "expected channel");
3213 return Type::make_error_type();
3217 // Return the type of the Variable. This may be called before
3218 // Variable::determine_type is called, which means that we may need to
3219 // get the type from the initializer. FIXME: If we combine lowering
3220 // with type determination, then this should be unnecessary.
3225 // A variable in a type switch with a nil case will have the wrong
3226 // type here. This gets fixed up in determine_type, below.
3227 Type
* type
= this->type_
;
3228 Expression
* init
= this->init_
;
3229 if (this->is_type_switch_var_
3230 && this->type_
->is_nil_constant_as_type())
3232 Type_guard_expression
* tge
= this->init_
->type_guard_expression();
3233 gcc_assert(tge
!= NULL
);
3240 if (this->type_
== NULL
|| !this->type_
->is_error_type())
3242 error_at(this->location_
, "variable initializer refers to itself");
3243 this->type_
= Type::make_error_type();
3252 else if (this->type_from_init_tuple_
)
3253 type
= this->type_from_tuple(init
, false);
3254 else if (this->type_from_range_index_
|| this->type_from_range_value_
)
3255 type
= this->type_from_range(init
, this->type_from_range_index_
, false);
3256 else if (this->type_from_chan_element_
)
3257 type
= this->type_from_chan_element(init
, false);
3260 gcc_assert(init
!= NULL
);
3261 type
= init
->type();
3262 gcc_assert(type
!= NULL
);
3264 // Variables should not have abstract types.
3265 if (type
->is_abstract())
3266 type
= type
->make_non_abstract_type();
3268 if (type
->is_void_type())
3269 type
= Type::make_error_type();
3272 this->seen_
= false;
3277 // Fetch the type from a const pointer, in which case it should have
3278 // been set already.
3281 Variable::type() const
3283 gcc_assert(this->type_
!= NULL
);
3287 // Set the type if necessary.
3290 Variable::determine_type()
3292 // A variable in a type switch with a nil case will have the wrong
3293 // type here. It will have an initializer which is a type guard.
3294 // We want to initialize it to the value without the type guard, and
3295 // use the type of that value as well.
3296 if (this->is_type_switch_var_
&& this->type_
->is_nil_constant_as_type())
3298 Type_guard_expression
* tge
= this->init_
->type_guard_expression();
3299 gcc_assert(tge
!= NULL
);
3301 this->init_
= tge
->expr();
3304 if (this->init_
== NULL
)
3305 gcc_assert(this->type_
!= NULL
&& !this->type_
->is_abstract());
3306 else if (this->type_from_init_tuple_
)
3308 Expression
*init
= this->init_
;
3309 init
->determine_type_no_context();
3310 this->type_
= this->type_from_tuple(init
, true);
3313 else if (this->type_from_range_index_
|| this->type_from_range_value_
)
3315 Expression
* init
= this->init_
;
3316 init
->determine_type_no_context();
3317 this->type_
= this->type_from_range(init
, this->type_from_range_index_
,
3323 // type_from_chan_element_ should have been cleared during
3325 gcc_assert(!this->type_from_chan_element_
);
3327 Type_context
context(this->type_
, false);
3328 this->init_
->determine_type(&context
);
3329 if (this->type_
== NULL
)
3331 Type
* type
= this->init_
->type();
3332 gcc_assert(type
!= NULL
);
3333 if (type
->is_abstract())
3334 type
= type
->make_non_abstract_type();
3336 if (type
->is_void_type())
3338 error_at(this->location_
, "variable has no type");
3339 type
= Type::make_error_type();
3341 else if (type
->is_nil_type())
3343 error_at(this->location_
, "variable defined to nil type");
3344 type
= Type::make_error_type();
3346 else if (type
->is_call_multiple_result_type())
3348 error_at(this->location_
,
3349 "single variable set to multiple value function call");
3350 type
= Type::make_error_type();
3358 // Export the variable
3361 Variable::export_var(Export
* exp
, const std::string
& name
) const
3363 gcc_assert(this->is_global_
);
3364 exp
->write_c_string("var ");
3365 exp
->write_string(name
);
3366 exp
->write_c_string(" ");
3367 exp
->write_type(this->type());
3368 exp
->write_c_string(";\n");
3371 // Import a variable.
3374 Variable::import_var(Import
* imp
, std::string
* pname
, Type
** ptype
)
3376 imp
->require_c_string("var ");
3377 *pname
= imp
->read_identifier();
3378 imp
->require_c_string(" ");
3379 *ptype
= imp
->read_type();
3380 imp
->require_c_string(";\n");
3383 // Class Named_constant.
3385 // Traverse the initializer expression.
3388 Named_constant::traverse_expression(Traverse
* traverse
)
3390 return Expression::traverse(&this->expr_
, traverse
);
3393 // Determine the type of the constant.
3396 Named_constant::determine_type()
3398 if (this->type_
!= NULL
)
3400 Type_context
context(this->type_
, false);
3401 this->expr_
->determine_type(&context
);
3405 // A constant may have an abstract type.
3406 Type_context
context(NULL
, true);
3407 this->expr_
->determine_type(&context
);
3408 this->type_
= this->expr_
->type();
3409 gcc_assert(this->type_
!= NULL
);
3413 // Indicate that we found and reported an error for this constant.
3416 Named_constant::set_error()
3418 this->type_
= Type::make_error_type();
3419 this->expr_
= Expression::make_error(this->location_
);
3422 // Export a constant.
3425 Named_constant::export_const(Export
* exp
, const std::string
& name
) const
3427 exp
->write_c_string("const ");
3428 exp
->write_string(name
);
3429 exp
->write_c_string(" ");
3430 if (!this->type_
->is_abstract())
3432 exp
->write_type(this->type_
);
3433 exp
->write_c_string(" ");
3435 exp
->write_c_string("= ");
3436 this->expr()->export_expression(exp
);
3437 exp
->write_c_string(";\n");
3440 // Import a constant.
3443 Named_constant::import_const(Import
* imp
, std::string
* pname
, Type
** ptype
,
3446 imp
->require_c_string("const ");
3447 *pname
= imp
->read_identifier();
3448 imp
->require_c_string(" ");
3449 if (imp
->peek_char() == '=')
3453 *ptype
= imp
->read_type();
3454 imp
->require_c_string(" ");
3456 imp
->require_c_string("= ");
3457 *pexpr
= Expression::import_expression(imp
);
3458 imp
->require_c_string(";\n");
3464 Type_declaration::add_method(const std::string
& name
, Function
* function
)
3466 Named_object
* ret
= Named_object::make_function(name
, NULL
, function
);
3467 this->methods_
.push_back(ret
);
3471 // Add a method declaration.
3474 Type_declaration::add_method_declaration(const std::string
& name
,
3475 Function_type
* type
,
3476 source_location location
)
3478 Named_object
* ret
= Named_object::make_function_declaration(name
, NULL
, type
,
3480 this->methods_
.push_back(ret
);
3484 // Return whether any methods ere defined.
3487 Type_declaration::has_methods() const
3489 return !this->methods_
.empty();
3492 // Define methods for the real type.
3495 Type_declaration::define_methods(Named_type
* nt
)
3497 for (Methods::const_iterator p
= this->methods_
.begin();
3498 p
!= this->methods_
.end();
3500 nt
->add_existing_method(*p
);
3503 // We are using the type. Return true if we should issue a warning.
3506 Type_declaration::using_type()
3508 bool ret
= !this->issued_warning_
;
3509 this->issued_warning_
= true;
3513 // Class Unknown_name.
3515 // Set the real named object.
3518 Unknown_name::set_real_named_object(Named_object
* no
)
3520 gcc_assert(this->real_named_object_
== NULL
);
3521 gcc_assert(!no
->is_unknown());
3522 this->real_named_object_
= no
;
3525 // Class Named_object.
3527 Named_object::Named_object(const std::string
& name
,
3528 const Package
* package
,
3529 Classification classification
)
3530 : name_(name
), package_(package
), classification_(classification
),
3533 if (Gogo::is_sink_name(name
))
3534 gcc_assert(classification
== NAMED_OBJECT_SINK
);
3537 // Make an unknown name. This is used by the parser. The name must
3538 // be resolved later. Unknown names are only added in the current
3542 Named_object::make_unknown_name(const std::string
& name
,
3543 source_location location
)
3545 Named_object
* named_object
= new Named_object(name
, NULL
,
3546 NAMED_OBJECT_UNKNOWN
);
3547 Unknown_name
* value
= new Unknown_name(location
);
3548 named_object
->u_
.unknown_value
= value
;
3549 return named_object
;
3555 Named_object::make_constant(const Typed_identifier
& tid
,
3556 const Package
* package
, Expression
* expr
,
3559 Named_object
* named_object
= new Named_object(tid
.name(), package
,
3560 NAMED_OBJECT_CONST
);
3561 Named_constant
* named_constant
= new Named_constant(tid
.type(), expr
,
3564 named_object
->u_
.const_value
= named_constant
;
3565 return named_object
;
3568 // Make a named type.
3571 Named_object::make_type(const std::string
& name
, const Package
* package
,
3572 Type
* type
, source_location location
)
3574 Named_object
* named_object
= new Named_object(name
, package
,
3576 Named_type
* named_type
= Type::make_named_type(named_object
, type
, location
);
3577 named_object
->u_
.type_value
= named_type
;
3578 return named_object
;
3581 // Make a type declaration.
3584 Named_object::make_type_declaration(const std::string
& name
,
3585 const Package
* package
,
3586 source_location location
)
3588 Named_object
* named_object
= new Named_object(name
, package
,
3589 NAMED_OBJECT_TYPE_DECLARATION
);
3590 Type_declaration
* type_declaration
= new Type_declaration(location
);
3591 named_object
->u_
.type_declaration
= type_declaration
;
3592 return named_object
;
3598 Named_object::make_variable(const std::string
& name
, const Package
* package
,
3601 Named_object
* named_object
= new Named_object(name
, package
,
3603 named_object
->u_
.var_value
= variable
;
3604 return named_object
;
3607 // Make a result variable.
3610 Named_object::make_result_variable(const std::string
& name
,
3611 Result_variable
* result
)
3613 Named_object
* named_object
= new Named_object(name
, NULL
,
3614 NAMED_OBJECT_RESULT_VAR
);
3615 named_object
->u_
.result_var_value
= result
;
3616 return named_object
;
3619 // Make a sink. This is used for the special blank identifier _.
3622 Named_object::make_sink()
3624 return new Named_object("_", NULL
, NAMED_OBJECT_SINK
);
3627 // Make a named function.
3630 Named_object::make_function(const std::string
& name
, const Package
* package
,
3633 Named_object
* named_object
= new Named_object(name
, package
,
3635 named_object
->u_
.func_value
= function
;
3636 return named_object
;
3639 // Make a function declaration.
3642 Named_object::make_function_declaration(const std::string
& name
,
3643 const Package
* package
,
3644 Function_type
* fntype
,
3645 source_location location
)
3647 Named_object
* named_object
= new Named_object(name
, package
,
3648 NAMED_OBJECT_FUNC_DECLARATION
);
3649 Function_declaration
*func_decl
= new Function_declaration(fntype
, location
);
3650 named_object
->u_
.func_declaration_value
= func_decl
;
3651 return named_object
;
3657 Named_object::make_package(const std::string
& alias
, Package
* package
)
3659 Named_object
* named_object
= new Named_object(alias
, NULL
,
3660 NAMED_OBJECT_PACKAGE
);
3661 named_object
->u_
.package_value
= package
;
3662 return named_object
;
3665 // Return the name to use in an error message.
3668 Named_object::message_name() const
3670 if (this->package_
== NULL
)
3671 return Gogo::message_name(this->name_
);
3672 std::string ret
= Gogo::message_name(this->package_
->name());
3674 ret
+= Gogo::message_name(this->name_
);
3678 // Set the type when a declaration is defined.
3681 Named_object::set_type_value(Named_type
* named_type
)
3683 gcc_assert(this->classification_
== NAMED_OBJECT_TYPE_DECLARATION
);
3684 Type_declaration
* td
= this->u_
.type_declaration
;
3685 td
->define_methods(named_type
);
3686 Named_object
* in_function
= td
->in_function();
3687 if (in_function
!= NULL
)
3688 named_type
->set_in_function(in_function
);
3690 this->classification_
= NAMED_OBJECT_TYPE
;
3691 this->u_
.type_value
= named_type
;
3694 // Define a function which was previously declared.
3697 Named_object::set_function_value(Function
* function
)
3699 gcc_assert(this->classification_
== NAMED_OBJECT_FUNC_DECLARATION
);
3700 this->classification_
= NAMED_OBJECT_FUNC
;
3701 // FIXME: We should free the old value.
3702 this->u_
.func_value
= function
;
3705 // Return the location of a named object.
3708 Named_object::location() const
3710 switch (this->classification_
)
3713 case NAMED_OBJECT_UNINITIALIZED
:
3716 case NAMED_OBJECT_UNKNOWN
:
3717 return this->unknown_value()->location();
3719 case NAMED_OBJECT_CONST
:
3720 return this->const_value()->location();
3722 case NAMED_OBJECT_TYPE
:
3723 return this->type_value()->location();
3725 case NAMED_OBJECT_TYPE_DECLARATION
:
3726 return this->type_declaration_value()->location();
3728 case NAMED_OBJECT_VAR
:
3729 return this->var_value()->location();
3731 case NAMED_OBJECT_RESULT_VAR
:
3732 return this->result_var_value()->function()->location();
3734 case NAMED_OBJECT_SINK
:
3737 case NAMED_OBJECT_FUNC
:
3738 return this->func_value()->location();
3740 case NAMED_OBJECT_FUNC_DECLARATION
:
3741 return this->func_declaration_value()->location();
3743 case NAMED_OBJECT_PACKAGE
:
3744 return this->package_value()->location();
3748 // Export a named object.
3751 Named_object::export_named_object(Export
* exp
) const
3753 switch (this->classification_
)
3756 case NAMED_OBJECT_UNINITIALIZED
:
3757 case NAMED_OBJECT_UNKNOWN
:
3760 case NAMED_OBJECT_CONST
:
3761 this->const_value()->export_const(exp
, this->name_
);
3764 case NAMED_OBJECT_TYPE
:
3765 this->type_value()->export_named_type(exp
, this->name_
);
3768 case NAMED_OBJECT_TYPE_DECLARATION
:
3769 error_at(this->type_declaration_value()->location(),
3770 "attempt to export %<%s%> which was declared but not defined",
3771 this->message_name().c_str());
3774 case NAMED_OBJECT_FUNC_DECLARATION
:
3775 this->func_declaration_value()->export_func(exp
, this->name_
);
3778 case NAMED_OBJECT_VAR
:
3779 this->var_value()->export_var(exp
, this->name_
);
3782 case NAMED_OBJECT_RESULT_VAR
:
3783 case NAMED_OBJECT_SINK
:
3786 case NAMED_OBJECT_FUNC
:
3787 this->func_value()->export_func(exp
, this->name_
);
3794 Bindings::Bindings(Bindings
* enclosing
)
3795 : enclosing_(enclosing
), named_objects_(), bindings_()
3802 Bindings::clear_file_scope()
3804 Contour::iterator p
= this->bindings_
.begin();
3805 while (p
!= this->bindings_
.end())
3808 if (p
->second
->package() != NULL
)
3810 else if (p
->second
->is_package())
3812 else if (p
->second
->is_function()
3813 && !p
->second
->func_value()->type()->is_method()
3814 && Gogo::unpack_hidden_name(p
->second
->name()) == "init")
3822 p
= this->bindings_
.erase(p
);
3826 // Look up a symbol.
3829 Bindings::lookup(const std::string
& name
) const
3831 Contour::const_iterator p
= this->bindings_
.find(name
);
3832 if (p
!= this->bindings_
.end())
3833 return p
->second
->resolve();
3834 else if (this->enclosing_
!= NULL
)
3835 return this->enclosing_
->lookup(name
);
3840 // Look up a symbol locally.
3843 Bindings::lookup_local(const std::string
& name
) const
3845 Contour::const_iterator p
= this->bindings_
.find(name
);
3846 if (p
== this->bindings_
.end())
3851 // Remove an object from a set of bindings. This is used for a
3852 // special case in thunks for functions which call recover.
3855 Bindings::remove_binding(Named_object
* no
)
3857 Contour::iterator pb
= this->bindings_
.find(no
->name());
3858 gcc_assert(pb
!= this->bindings_
.end());
3859 this->bindings_
.erase(pb
);
3860 for (std::vector
<Named_object
*>::iterator pn
= this->named_objects_
.begin();
3861 pn
!= this->named_objects_
.end();
3866 this->named_objects_
.erase(pn
);
3873 // Add a method to the list of objects. This is not added to the
3874 // lookup table. This is so that we have a single list of objects
3875 // declared at the top level, which we walk through when it's time to
3876 // convert to trees.
3879 Bindings::add_method(Named_object
* method
)
3881 this->named_objects_
.push_back(method
);
3884 // Add a generic Named_object to a Contour.
3887 Bindings::add_named_object_to_contour(Contour
* contour
,
3888 Named_object
* named_object
)
3890 gcc_assert(named_object
== named_object
->resolve());
3891 const std::string
& name(named_object
->name());
3892 gcc_assert(!Gogo::is_sink_name(name
));
3894 std::pair
<Contour::iterator
, bool> ins
=
3895 contour
->insert(std::make_pair(name
, named_object
));
3898 // The name was already there.
3899 if (named_object
->package() != NULL
3900 && ins
.first
->second
->package() == named_object
->package()
3901 && (ins
.first
->second
->classification()
3902 == named_object
->classification()))
3904 // This is a second import of the same object.
3905 return ins
.first
->second
;
3907 ins
.first
->second
= this->new_definition(ins
.first
->second
,
3909 return ins
.first
->second
;
3913 // Don't push declarations on the list. We push them on when
3914 // and if we find the definitions. That way we genericize the
3915 // functions in order.
3916 if (!named_object
->is_type_declaration()
3917 && !named_object
->is_function_declaration()
3918 && !named_object
->is_unknown())
3919 this->named_objects_
.push_back(named_object
);
3920 return named_object
;
3924 // We had an existing named object OLD_OBJECT, and we've seen a new
3925 // one NEW_OBJECT with the same name. FIXME: This does not free the
3926 // new object when we don't need it.
3929 Bindings::new_definition(Named_object
* old_object
, Named_object
* new_object
)
3932 switch (old_object
->classification())
3935 case Named_object::NAMED_OBJECT_UNINITIALIZED
:
3938 case Named_object::NAMED_OBJECT_UNKNOWN
:
3940 Named_object
* real
= old_object
->unknown_value()->real_named_object();
3942 return this->new_definition(real
, new_object
);
3943 gcc_assert(!new_object
->is_unknown());
3944 old_object
->unknown_value()->set_real_named_object(new_object
);
3945 if (!new_object
->is_type_declaration()
3946 && !new_object
->is_function_declaration())
3947 this->named_objects_
.push_back(new_object
);
3951 case Named_object::NAMED_OBJECT_CONST
:
3954 case Named_object::NAMED_OBJECT_TYPE
:
3955 if (new_object
->is_type_declaration())
3959 case Named_object::NAMED_OBJECT_TYPE_DECLARATION
:
3960 if (new_object
->is_type_declaration())
3962 if (new_object
->is_type())
3964 old_object
->set_type_value(new_object
->type_value());
3965 new_object
->type_value()->set_named_object(old_object
);
3966 this->named_objects_
.push_back(old_object
);
3971 case Named_object::NAMED_OBJECT_VAR
:
3972 case Named_object::NAMED_OBJECT_RESULT_VAR
:
3975 case Named_object::NAMED_OBJECT_SINK
:
3978 case Named_object::NAMED_OBJECT_FUNC
:
3979 if (new_object
->is_function_declaration())
3981 if (!new_object
->func_declaration_value()->asm_name().empty())
3982 sorry("__asm__ for function definitions");
3983 Function_type
* old_type
= old_object
->func_value()->type();
3984 Function_type
* new_type
=
3985 new_object
->func_declaration_value()->type();
3986 if (old_type
->is_valid_redeclaration(new_type
, &reason
))
3991 case Named_object::NAMED_OBJECT_FUNC_DECLARATION
:
3993 Function_type
* old_type
= old_object
->func_declaration_value()->type();
3994 if (new_object
->is_function_declaration())
3996 Function_type
* new_type
=
3997 new_object
->func_declaration_value()->type();
3998 if (old_type
->is_valid_redeclaration(new_type
, &reason
))
4001 if (new_object
->is_function())
4003 Function_type
* new_type
= new_object
->func_value()->type();
4004 if (old_type
->is_valid_redeclaration(new_type
, &reason
))
4006 if (!old_object
->func_declaration_value()->asm_name().empty())
4007 sorry("__asm__ for function definitions");
4008 old_object
->set_function_value(new_object
->func_value());
4009 this->named_objects_
.push_back(old_object
);
4016 case Named_object::NAMED_OBJECT_PACKAGE
:
4017 if (new_object
->is_package()
4018 && (old_object
->package_value()->name()
4019 == new_object
->package_value()->name()))
4025 std::string n
= old_object
->message_name();
4027 error_at(new_object
->location(), "redefinition of %qs", n
.c_str());
4029 error_at(new_object
->location(), "redefinition of %qs: %s", n
.c_str(),
4032 inform(old_object
->location(), "previous definition of %qs was here",
4038 // Add a named type.
4041 Bindings::add_named_type(Named_type
* named_type
)
4043 return this->add_named_object(named_type
->named_object());
4049 Bindings::add_function(const std::string
& name
, const Package
* package
,
4052 return this->add_named_object(Named_object::make_function(name
, package
,
4056 // Add a function declaration.
4059 Bindings::add_function_declaration(const std::string
& name
,
4060 const Package
* package
,
4061 Function_type
* type
,
4062 source_location location
)
4064 Named_object
* no
= Named_object::make_function_declaration(name
, package
,
4066 return this->add_named_object(no
);
4069 // Define a type which was previously declared.
4072 Bindings::define_type(Named_object
* no
, Named_type
* type
)
4074 no
->set_type_value(type
);
4075 this->named_objects_
.push_back(no
);
4078 // Traverse bindings.
4081 Bindings::traverse(Traverse
* traverse
, bool is_global
)
4083 unsigned int traverse_mask
= traverse
->traverse_mask();
4085 // We don't use an iterator because we permit the traversal to add
4086 // new global objects.
4087 for (size_t i
= 0; i
< this->named_objects_
.size(); ++i
)
4089 Named_object
* p
= this->named_objects_
[i
];
4090 switch (p
->classification())
4092 case Named_object::NAMED_OBJECT_CONST
:
4093 if ((traverse_mask
& Traverse::traverse_constants
) != 0)
4095 if (traverse
->constant(p
, is_global
) == TRAVERSE_EXIT
)
4096 return TRAVERSE_EXIT
;
4098 if ((traverse_mask
& Traverse::traverse_types
) != 0
4099 || (traverse_mask
& Traverse::traverse_expressions
) != 0)
4101 Type
* t
= p
->const_value()->type();
4103 && Type::traverse(t
, traverse
) == TRAVERSE_EXIT
)
4104 return TRAVERSE_EXIT
;
4106 if ((traverse_mask
& Traverse::traverse_expressions
) != 0)
4108 if (p
->const_value()->traverse_expression(traverse
)
4110 return TRAVERSE_EXIT
;
4114 case Named_object::NAMED_OBJECT_VAR
:
4115 case Named_object::NAMED_OBJECT_RESULT_VAR
:
4116 if ((traverse_mask
& Traverse::traverse_variables
) != 0)
4118 if (traverse
->variable(p
) == TRAVERSE_EXIT
)
4119 return TRAVERSE_EXIT
;
4121 if (((traverse_mask
& Traverse::traverse_types
) != 0
4122 || (traverse_mask
& Traverse::traverse_expressions
) != 0)
4123 && (p
->is_result_variable()
4124 || p
->var_value()->has_type()))
4126 Type
* t
= (p
->is_variable()
4127 ? p
->var_value()->type()
4128 : p
->result_var_value()->type());
4130 && Type::traverse(t
, traverse
) == TRAVERSE_EXIT
)
4131 return TRAVERSE_EXIT
;
4133 if (p
->is_variable()
4134 && (traverse_mask
& Traverse::traverse_expressions
) != 0)
4136 if (p
->var_value()->traverse_expression(traverse
)
4138 return TRAVERSE_EXIT
;
4142 case Named_object::NAMED_OBJECT_FUNC
:
4143 if ((traverse_mask
& Traverse::traverse_functions
) != 0)
4145 int t
= traverse
->function(p
);
4146 if (t
== TRAVERSE_EXIT
)
4147 return TRAVERSE_EXIT
;
4148 else if (t
== TRAVERSE_SKIP_COMPONENTS
)
4153 & (Traverse::traverse_variables
4154 | Traverse::traverse_constants
4155 | Traverse::traverse_functions
4156 | Traverse::traverse_blocks
4157 | Traverse::traverse_statements
4158 | Traverse::traverse_expressions
4159 | Traverse::traverse_types
)) != 0)
4161 if (p
->func_value()->traverse(traverse
) == TRAVERSE_EXIT
)
4162 return TRAVERSE_EXIT
;
4166 case Named_object::NAMED_OBJECT_PACKAGE
:
4167 // These are traversed in Gogo::traverse.
4168 gcc_assert(is_global
);
4171 case Named_object::NAMED_OBJECT_TYPE
:
4172 if ((traverse_mask
& Traverse::traverse_types
) != 0
4173 || (traverse_mask
& Traverse::traverse_expressions
) != 0)
4175 if (Type::traverse(p
->type_value(), traverse
) == TRAVERSE_EXIT
)
4176 return TRAVERSE_EXIT
;
4180 case Named_object::NAMED_OBJECT_TYPE_DECLARATION
:
4181 case Named_object::NAMED_OBJECT_FUNC_DECLARATION
:
4182 case Named_object::NAMED_OBJECT_UNKNOWN
:
4185 case Named_object::NAMED_OBJECT_SINK
:
4191 return TRAVERSE_CONTINUE
;
4196 Package::Package(const std::string
& name
, const std::string
& unique_prefix
,
4197 source_location location
)
4198 : name_(name
), unique_prefix_(unique_prefix
), bindings_(new Bindings(NULL
)),
4199 priority_(0), location_(location
), used_(false), is_imported_(false),
4200 uses_sink_alias_(false)
4202 gcc_assert(!name
.empty() && !unique_prefix
.empty());
4205 // Set the priority. We may see multiple priorities for an imported
4206 // package; we want to use the largest one.
4209 Package::set_priority(int priority
)
4211 if (priority
> this->priority_
)
4212 this->priority_
= priority
;
4215 // Determine types of constants. Everything else in a package
4216 // (variables, function declarations) should already have a fixed
4217 // type. Constants may have abstract types.
4220 Package::determine_types()
4222 Bindings
* bindings
= this->bindings_
;
4223 for (Bindings::const_definitions_iterator p
= bindings
->begin_definitions();
4224 p
!= bindings
->end_definitions();
4227 if ((*p
)->is_const())
4228 (*p
)->const_value()->determine_type();
4236 Traverse::~Traverse()
4238 if (this->types_seen_
!= NULL
)
4239 delete this->types_seen_
;
4240 if (this->expressions_seen_
!= NULL
)
4241 delete this->expressions_seen_
;
4244 // Record that we are looking at a type, and return true if we have
4248 Traverse::remember_type(const Type
* type
)
4250 if (type
->is_error_type())
4252 gcc_assert((this->traverse_mask() & traverse_types
) != 0
4253 || (this->traverse_mask() & traverse_expressions
) != 0);
4254 // We only have to remember named types, as they are the only ones
4255 // we can see multiple times in a traversal.
4256 if (type
->classification() != Type::TYPE_NAMED
)
4258 if (this->types_seen_
== NULL
)
4259 this->types_seen_
= new Types_seen();
4260 std::pair
<Types_seen::iterator
, bool> ins
= this->types_seen_
->insert(type
);
4264 // Record that we are looking at an expression, and return true if we
4265 // have already seen it.
4268 Traverse::remember_expression(const Expression
* expression
)
4270 gcc_assert((this->traverse_mask() & traverse_types
) != 0
4271 || (this->traverse_mask() & traverse_expressions
) != 0);
4272 if (this->expressions_seen_
== NULL
)
4273 this->expressions_seen_
= new Expressions_seen();
4274 std::pair
<Expressions_seen::iterator
, bool> ins
=
4275 this->expressions_seen_
->insert(expression
);
4279 // The default versions of these functions should never be called: the
4280 // traversal mask indicates which functions may be called.
4283 Traverse::variable(Named_object
*)
4289 Traverse::constant(Named_object
*, bool)
4295 Traverse::function(Named_object
*)
4301 Traverse::block(Block
*)
4307 Traverse::statement(Block
*, size_t*, Statement
*)
4313 Traverse::expression(Expression
**)
4319 Traverse::type(Type
*)