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();
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 error_at(constant->location(), "invalid constant type");
1476 constant->set_error();
1478 else if (!constant->expr()->is_constant())
1480 error_at(constant->expr()->location(), "expression is not constant");
1481 constant->set_error();
1483 else if (!Type::are_assignable(constant->type(), constant->expr()->type(),
1486 error_at(constant->location(),
1487 "initialization expression has wrong type");
1488 constant->set_error();
1490 return TRAVERSE_CONTINUE;
1493 // Check that types are valid in a statement.
1496 Check_types_traverse::statement(Block*, size_t*, Statement* s)
1498 s->check_types(this->gogo_);
1499 return TRAVERSE_CONTINUE;
1502 // Check that types are valid in an expression.
1505 Check_types_traverse::expression(Expression** expr)
1507 (*expr)->check_types(this->gogo_);
1508 return TRAVERSE_CONTINUE;
1511 // Check that types are valid.
1516 Check_types_traverse traverse(this);
1517 this->traverse(&traverse);
1520 // Check the types in a single block.
1523 Gogo::check_types_in_block(Block* block)
1525 Check_types_traverse traverse(this);
1526 block->traverse(&traverse);
1529 // A traversal class used to find a single shortcut operator within an
1532 class Find_shortcut : public Traverse
1536 : Traverse(traverse_blocks
1537 | traverse_statements
1538 | traverse_expressions),
1542 // A pointer to the expression which was found, or NULL if none was
1546 { return this->found_; }
1551 { return TRAVERSE_SKIP_COMPONENTS; }
1554 statement(Block*, size_t*, Statement*)
1555 { return TRAVERSE_SKIP_COMPONENTS; }
1558 expression(Expression**);
1561 Expression** found_;
1564 // Find a shortcut expression.
1567 Find_shortcut::expression(Expression** pexpr)
1569 Expression* expr = *pexpr;
1570 Binary_expression* be = expr->binary_expression();
1572 return TRAVERSE_CONTINUE;
1573 Operator op = be->op();
1574 if (op != OPERATOR_OROR && op != OPERATOR_ANDAND)
1575 return TRAVERSE_CONTINUE;
1576 gcc_assert(this->found_ == NULL);
1577 this->found_ = pexpr;
1578 return TRAVERSE_EXIT;
1581 // A traversal class used to turn shortcut operators into explicit if
1584 class Shortcuts : public Traverse
1588 : Traverse(traverse_variables
1589 | traverse_statements)
1594 variable(Named_object*);
1597 statement(Block*, size_t*, Statement*);
1600 // Convert a shortcut operator.
1602 convert_shortcut(Block* enclosing, Expression** pshortcut);
1605 // Remove shortcut operators in a single statement.
1608 Shortcuts::statement(Block* block, size_t* pindex, Statement* s)
1610 // FIXME: This approach doesn't work for switch statements, because
1611 // we add the new statements before the whole switch when we need to
1612 // instead add them just before the switch expression. The right
1613 // fix is probably to lower switch statements with nonconstant cases
1614 // to a series of conditionals.
1615 if (s->switch_statement() != NULL)
1616 return TRAVERSE_CONTINUE;
1620 Find_shortcut find_shortcut;
1622 // If S is a variable declaration, then ordinary traversal won't
1623 // do anything. We want to explicitly traverse the
1624 // initialization expression if there is one.
1625 Variable_declaration_statement* vds = s->variable_declaration_statement();
1626 Expression* init = NULL;
1628 s->traverse_contents(&find_shortcut);
1631 init = vds->var()->var_value()->init();
1633 return TRAVERSE_CONTINUE;
1634 init->traverse(&init, &find_shortcut);
1636 Expression** pshortcut = find_shortcut.found();
1637 if (pshortcut == NULL)
1638 return TRAVERSE_CONTINUE;
1640 Statement* snew = this->convert_shortcut(block, pshortcut);
1641 block->insert_statement_before(*pindex, snew);
1644 if (pshortcut == &init)
1645 vds->var()->var_value()->set_init(init);
1649 // Remove shortcut operators in the initializer of a global variable.
1652 Shortcuts::variable(Named_object* no)
1654 if (no->is_result_variable())
1655 return TRAVERSE_CONTINUE;
1656 Variable* var = no->var_value();
1657 Expression* init = var->init();
1658 if (!var->is_global() || init == NULL)
1659 return TRAVERSE_CONTINUE;
1663 Find_shortcut find_shortcut;
1664 init->traverse(&init, &find_shortcut);
1665 Expression** pshortcut = find_shortcut.found();
1666 if (pshortcut == NULL)
1667 return TRAVERSE_CONTINUE;
1669 Statement* snew = this->convert_shortcut(NULL, pshortcut);
1670 var->add_preinit_statement(snew);
1671 if (pshortcut == &init)
1672 var->set_init(init);
1676 // Given an expression which uses a shortcut operator, return a
1677 // statement which implements it, and update *PSHORTCUT accordingly.
1680 Shortcuts::convert_shortcut(Block* enclosing, Expression** pshortcut)
1682 Binary_expression* shortcut = (*pshortcut)->binary_expression();
1683 Expression* left = shortcut->left();
1684 Expression* right = shortcut->right();
1685 source_location loc = shortcut->location();
1687 Block* retblock = new Block(enclosing, loc);
1688 retblock->set_end_location(loc);
1690 Temporary_statement* ts = Statement::make_temporary(Type::make_boolean_type(),
1692 retblock->add_statement(ts);
1694 Block* block = new Block(retblock, loc);
1695 block->set_end_location(loc);
1696 Expression* tmpref = Expression::make_temporary_reference(ts, loc);
1697 Statement* assign = Statement::make_assignment(tmpref, right, loc);
1698 block->add_statement(assign);
1700 Expression* cond = Expression::make_temporary_reference(ts, loc);
1701 if (shortcut->binary_expression()->op() == OPERATOR_OROR)
1702 cond = Expression::make_unary(OPERATOR_NOT, cond, loc);
1704 Statement* if_statement = Statement::make_if_statement(cond, block, NULL,
1706 retblock->add_statement(if_statement);
1708 *pshortcut = Expression::make_temporary_reference(ts, loc);
1712 // Now convert any shortcut operators in LEFT and RIGHT.
1713 Shortcuts shortcuts;
1714 retblock->traverse(&shortcuts);
1716 return Statement::make_block_statement(retblock, loc);
1719 // Turn shortcut operators into explicit if statements. Doing this
1720 // considerably simplifies the order of evaluation rules.
1723 Gogo::remove_shortcuts()
1725 Shortcuts shortcuts;
1726 this->traverse(&shortcuts);
1729 // A traversal class which finds all the expressions which must be
1730 // evaluated in order within a statement or larger expression. This
1731 // is used to implement the rules about order of evaluation.
1733 class Find_eval_ordering : public Traverse
1736 typedef std::vector<Expression**> Expression_pointers;
1739 Find_eval_ordering()
1740 : Traverse(traverse_blocks
1741 | traverse_statements
1742 | traverse_expressions),
1748 { return this->exprs_.size(); }
1750 typedef Expression_pointers::const_iterator const_iterator;
1754 { return this->exprs_.begin(); }
1758 { return this->exprs_.end(); }
1763 { return TRAVERSE_SKIP_COMPONENTS; }
1766 statement(Block*, size_t*, Statement*)
1767 { return TRAVERSE_SKIP_COMPONENTS; }
1770 expression(Expression**);
1773 // A list of pointers to expressions with side-effects.
1774 Expression_pointers exprs_;
1777 // If an expression must be evaluated in order, put it on the list.
1780 Find_eval_ordering::expression(Expression** expression_pointer)
1782 // We have to look at subexpressions before this one.
1783 if ((*expression_pointer)->traverse_subexpressions(this) == TRAVERSE_EXIT)
1784 return TRAVERSE_EXIT;
1785 if ((*expression_pointer)->must_eval_in_order())
1786 this->exprs_.push_back(expression_pointer);
1787 return TRAVERSE_SKIP_COMPONENTS;
1790 // A traversal class for ordering evaluations.
1792 class Order_eval : public Traverse
1796 : Traverse(traverse_variables
1797 | traverse_statements)
1801 variable(Named_object*);
1804 statement(Block*, size_t*, Statement*);
1807 // Implement the order of evaluation rules for a statement.
1810 Order_eval::statement(Block* block, size_t* pindex, Statement* s)
1812 // FIXME: This approach doesn't work for switch statements, because
1813 // we add the new statements before the whole switch when we need to
1814 // instead add them just before the switch expression. The right
1815 // fix is probably to lower switch statements with nonconstant cases
1816 // to a series of conditionals.
1817 if (s->switch_statement() != NULL)
1818 return TRAVERSE_CONTINUE;
1820 Find_eval_ordering find_eval_ordering;
1822 // If S is a variable declaration, then ordinary traversal won't do
1823 // anything. We want to explicitly traverse the initialization
1824 // expression if there is one.
1825 Variable_declaration_statement* vds = s->variable_declaration_statement();
1826 Expression* init = NULL;
1827 Expression* orig_init = NULL;
1829 s->traverse_contents(&find_eval_ordering);
1832 init = vds->var()->var_value()->init();
1834 return TRAVERSE_CONTINUE;
1837 // It might seem that this could be
1838 // init->traverse_subexpressions. Unfortunately that can fail
1841 // newvar, err := call(arg())
1842 // Here newvar will have an init of call result 0 of
1843 // call(arg()). If we only traverse subexpressions, we will
1844 // only find arg(), and we won't bother to move anything out.
1845 // Then we get to the assignment to err, we will traverse the
1846 // whole statement, and this time we will find both call() and
1847 // arg(), and so we will move them out. This will cause them to
1848 // be put into temporary variables before the assignment to err
1849 // but after the declaration of newvar. To avoid that problem,
1850 // we traverse the entire expression here.
1851 Expression::traverse(&init, &find_eval_ordering);
1854 if (find_eval_ordering.size() <= 1)
1856 // If there is only one expression with a side-effect, we can
1857 // leave it in place.
1858 return TRAVERSE_CONTINUE;
1861 bool is_thunk = s->thunk_statement() != NULL;
1862 for (Find_eval_ordering::const_iterator p = find_eval_ordering.begin();
1863 p != find_eval_ordering.end();
1866 Expression** pexpr = *p;
1868 // If the last expression is a send or receive expression, we
1869 // may be ignoring the value; we don't want to evaluate it
1871 if (p + 1 == find_eval_ordering.end()
1872 && ((*pexpr)->classification() == Expression::EXPRESSION_SEND
1873 || (*pexpr)->classification() == Expression::EXPRESSION_RECEIVE))
1876 // The last expression in a thunk will be the call passed to go
1877 // or defer, which we must not evaluate early.
1878 if (is_thunk && p + 1 == find_eval_ordering.end())
1881 source_location loc = (*pexpr)->location();
1882 Temporary_statement* ts = Statement::make_temporary(NULL, *pexpr, loc);
1883 block->insert_statement_before(*pindex, ts);
1886 *pexpr = Expression::make_temporary_reference(ts, loc);
1889 if (init != orig_init)
1890 vds->var()->var_value()->set_init(init);
1892 return TRAVERSE_CONTINUE;
1895 // Implement the order of evaluation rules for the initializer of a
1899 Order_eval::variable(Named_object* no)
1901 if (no->is_result_variable())
1902 return TRAVERSE_CONTINUE;
1903 Variable* var = no->var_value();
1904 Expression* init = var->init();
1905 if (!var->is_global() || init == NULL)
1906 return TRAVERSE_CONTINUE;
1908 Find_eval_ordering find_eval_ordering;
1909 init->traverse_subexpressions(&find_eval_ordering);
1911 if (find_eval_ordering.size() <= 1)
1913 // If there is only one expression with a side-effect, we can
1914 // leave it in place.
1915 return TRAVERSE_SKIP_COMPONENTS;
1918 for (Find_eval_ordering::const_iterator p = find_eval_ordering.begin();
1919 p != find_eval_ordering.end();
1922 Expression** pexpr = *p;
1923 source_location loc = (*pexpr)->location();
1924 Temporary_statement* ts = Statement::make_temporary(NULL, *pexpr, loc);
1925 var->add_preinit_statement(ts);
1926 *pexpr = Expression::make_temporary_reference(ts, loc);
1929 return TRAVERSE_SKIP_COMPONENTS;
1932 // Use temporary variables to implement the order of evaluation rules.
1935 Gogo::order_evaluations()
1937 Order_eval order_eval;
1938 this->traverse(&order_eval);
1941 // Traversal to convert calls to the predeclared recover function to
1942 // pass in an argument indicating whether it can recover from a panic
1945 class Convert_recover : public Traverse
1948 Convert_recover(Named_object* arg)
1949 : Traverse(traverse_expressions),
1955 expression(Expression**);
1958 // The argument to pass to the function.
1962 // Convert calls to recover.
1965 Convert_recover::expression(Expression** pp)
1967 Call_expression* ce = (*pp)->call_expression();
1968 if (ce != NULL && ce->is_recover_call())
1969 ce->set_recover_arg(Expression::make_var_reference(this->arg_,
1971 return TRAVERSE_CONTINUE;
1974 // Traversal for build_recover_thunks.
1976 class Build_recover_thunks : public Traverse
1979 Build_recover_thunks(Gogo* gogo)
1980 : Traverse(traverse_functions),
1985 function(Named_object*);
1989 can_recover_arg(source_location);
1995 // If this function calls recover, turn it into a thunk.
1998 Build_recover_thunks::function(Named_object* orig_no)
2000 Function* orig_func = orig_no->func_value();
2001 if (!orig_func->calls_recover()
2002 || orig_func->is_recover_thunk()
2003 || orig_func->has_recover_thunk())
2004 return TRAVERSE_CONTINUE;
2006 Gogo* gogo = this->gogo_;
2007 source_location location = orig_func->location();
2012 Function_type* orig_fntype = orig_func->type();
2013 Typed_identifier_list* new_params = new Typed_identifier_list();
2014 std::string receiver_name;
2015 if (orig_fntype->is_method())
2017 const Typed_identifier* receiver = orig_fntype->receiver();
2018 snprintf(buf, sizeof buf, "rt.%u", count);
2020 receiver_name = buf;
2021 new_params->push_back(Typed_identifier(receiver_name, receiver->type(),
2022 receiver->location()));
2024 const Typed_identifier_list* orig_params = orig_fntype->parameters();
2025 if (orig_params != NULL && !orig_params->empty())
2027 for (Typed_identifier_list::const_iterator p = orig_params->begin();
2028 p != orig_params->end();
2031 snprintf(buf, sizeof buf, "pt.%u", count);
2033 new_params->push_back(Typed_identifier(buf, p->type(),
2037 snprintf(buf, sizeof buf, "pr.%u", count);
2039 std::string can_recover_name = buf;
2040 new_params->push_back(Typed_identifier(can_recover_name,
2041 Type::make_boolean_type(),
2042 orig_fntype->location()));
2044 const Typed_identifier_list* orig_results = orig_fntype->results();
2045 Typed_identifier_list* new_results;
2046 if (orig_results == NULL || orig_results->empty())
2050 new_results = new Typed_identifier_list();
2051 for (Typed_identifier_list::const_iterator p = orig_results->begin();
2052 p != orig_results->end();
2054 new_results->push_back(*p);
2057 Function_type *new_fntype = Type::make_function_type(NULL, new_params,
2059 orig_fntype->location());
2060 if (orig_fntype->is_varargs())
2061 new_fntype->set_is_varargs();
2063 std::string name = orig_no->name() + "$recover";
2064 Named_object *new_no = gogo->start_function(name, new_fntype, false,
2066 Function *new_func = new_no->func_value();
2067 if (orig_func->enclosing() != NULL)
2068 new_func->set_enclosing(orig_func->enclosing());
2070 // We build the code for the original function attached to the new
2071 // function, and then swap the original and new function bodies.
2072 // This means that existing references to the original function will
2073 // then refer to the new function. That makes this code a little
2074 // confusing, in that the reference to NEW_NO really refers to the
2075 // other function, not the one we are building.
2077 Expression* closure = NULL;
2078 if (orig_func->needs_closure())
2080 Named_object* orig_closure_no = orig_func->closure_var();
2081 Variable* orig_closure_var = orig_closure_no->var_value();
2082 Variable* new_var = new Variable(orig_closure_var->type(), NULL, false,
2083 true, false, location);
2084 snprintf(buf, sizeof buf, "closure.%u", count);
2086 Named_object* new_closure_no = Named_object::make_variable(buf, NULL,
2088 new_func->set_closure_var(new_closure_no);
2089 closure = Expression::make_var_reference(new_closure_no, location);
2092 Expression* fn = Expression::make_func_reference(new_no, closure, location);
2094 Expression_list* args = new Expression_list();
2095 if (orig_fntype->is_method())
2097 Named_object* rec_no = gogo->lookup(receiver_name, NULL);
2098 gcc_assert(rec_no != NULL
2099 && rec_no->is_variable()
2100 && rec_no->var_value()->is_parameter());
2101 args->push_back(Expression::make_var_reference(rec_no, location));
2103 if (new_params != NULL)
2105 // Note that we skip the last parameter, which is the boolean
2106 // indicating whether recover can succed.
2107 for (Typed_identifier_list::const_iterator p = new_params->begin();
2108 p + 1 != new_params->end();
2111 Named_object* p_no = gogo->lookup(p->name(), NULL);
2112 gcc_assert(p_no != NULL
2113 && p_no->is_variable()
2114 && p_no->var_value()->is_parameter());
2115 args->push_back(Expression::make_var_reference(p_no, location));
2118 args->push_back(this->can_recover_arg(location));
2120 Expression* call = Expression::make_call(fn, args, false, location);
2123 if (orig_fntype->results() == NULL || orig_fntype->results()->empty())
2124 s = Statement::make_statement(call);
2127 Expression_list* vals = new Expression_list();
2128 vals->push_back(call);
2129 s = Statement::make_return_statement(new_func->type()->results(),
2132 s->determine_types();
2133 gogo->add_statement(s);
2135 gogo->finish_function(location);
2137 // Swap the function bodies and types.
2138 new_func->swap_for_recover(orig_func);
2139 orig_func->set_is_recover_thunk();
2140 new_func->set_calls_recover();
2141 new_func->set_has_recover_thunk();
2143 Bindings* orig_bindings = orig_func->block()->bindings();
2144 Bindings* new_bindings = new_func->block()->bindings();
2145 if (orig_fntype->is_method())
2147 // We changed the receiver to be a regular parameter. We have
2148 // to update the binding accordingly in both functions.
2149 Named_object* orig_rec_no = orig_bindings->lookup_local(receiver_name);
2150 gcc_assert(orig_rec_no != NULL
2151 && orig_rec_no->is_variable()
2152 && !orig_rec_no->var_value()->is_receiver());
2153 orig_rec_no->var_value()->set_is_receiver();
2155 Named_object* new_rec_no = new_bindings->lookup_local(receiver_name);
2156 gcc_assert(new_rec_no != NULL
2157 && new_rec_no->is_variable()
2158 && !new_rec_no->var_value()->is_receiver());
2159 new_rec_no->var_value()->set_is_not_receiver();
2162 // Because we flipped blocks but not types, the can_recover
2163 // parameter appears in the (now) old bindings as a parameter.
2164 // Change it to a local variable, whereupon it will be discarded.
2165 Named_object* can_recover_no = orig_bindings->lookup_local(can_recover_name);
2166 gcc_assert(can_recover_no != NULL
2167 && can_recover_no->is_variable()
2168 && can_recover_no->var_value()->is_parameter());
2169 orig_bindings->remove_binding(can_recover_no);
2171 // Add the can_recover argument to the (now) new bindings, and
2172 // attach it to any recover statements.
2173 Variable* can_recover_var = new Variable(Type::make_boolean_type(), NULL,
2174 false, true, false, location);
2175 can_recover_no = new_bindings->add_variable(can_recover_name, NULL,
2177 Convert_recover convert_recover(can_recover_no);
2178 new_func->traverse(&convert_recover);
2180 return TRAVERSE_CONTINUE;
2183 // Return the expression to pass for the .can_recover parameter to the
2184 // new function. This indicates whether a call to recover may return
2185 // non-nil. The expression is
2186 // __go_can_recover(__builtin_return_address()).
2189 Build_recover_thunks::can_recover_arg(source_location location)
2191 static Named_object* builtin_return_address;
2192 if (builtin_return_address == NULL)
2194 const source_location bloc = BUILTINS_LOCATION;
2196 Typed_identifier_list* param_types = new Typed_identifier_list();
2197 Type* uint_type = Type::lookup_integer_type("uint");
2198 param_types->push_back(Typed_identifier("l", uint_type, bloc));
2200 Typed_identifier_list* return_types = new Typed_identifier_list();
2201 Type* voidptr_type = Type::make_pointer_type(Type::make_void_type());
2202 return_types->push_back(Typed_identifier("", voidptr_type, bloc));
2204 Function_type* fntype = Type::make_function_type(NULL, param_types,
2205 return_types, bloc);
2206 builtin_return_address =
2207 Named_object::make_function_declaration("__builtin_return_address",
2208 NULL, fntype, bloc);
2209 const char* n = "__builtin_return_address";
2210 builtin_return_address->func_declaration_value()->set_asm_name(n);
2213 static Named_object* can_recover;
2214 if (can_recover == NULL)
2216 const source_location bloc = BUILTINS_LOCATION;
2217 Typed_identifier_list* param_types = new Typed_identifier_list();
2218 Type* voidptr_type = Type::make_pointer_type(Type::make_void_type());
2219 param_types->push_back(Typed_identifier("a", voidptr_type, bloc));
2220 Type* boolean_type = Type::make_boolean_type();
2221 Typed_identifier_list* results = new Typed_identifier_list();
2222 results->push_back(Typed_identifier("", boolean_type, bloc));
2223 Function_type* fntype = Type::make_function_type(NULL, param_types,
2225 can_recover = Named_object::make_function_declaration("__go_can_recover",
2228 can_recover->func_declaration_value()->set_asm_name("__go_can_recover");
2231 Expression* fn = Expression::make_func_reference(builtin_return_address,
2235 mpz_init_set_ui(zval, 0UL);
2236 Expression* zexpr = Expression::make_integer(&zval, NULL, location);
2238 Expression_list *args = new Expression_list();
2239 args->push_back(zexpr);
2241 Expression* call = Expression::make_call(fn, args, false, location);
2243 args = new Expression_list();
2244 args->push_back(call);
2246 fn = Expression::make_func_reference(can_recover, NULL, location);
2247 return Expression::make_call(fn, args, false, location);
2250 // Build thunks for functions which call recover. We build a new
2251 // function with an extra parameter, which is whether a call to
2252 // recover can succeed. We then move the body of this function to
2253 // that one. We then turn this function into a thunk which calls the
2254 // new one, passing the value of
2255 // __go_can_recover(__builtin_return_address()). The function will be
2256 // marked as not splitting the stack. This will cooperate with the
2257 // implementation of defer to make recover do the right thing.
2260 Gogo::build_recover_thunks()
2262 Build_recover_thunks build_recover_thunks(this);
2263 this->traverse(&build_recover_thunks);
2266 // Look for named types to see whether we need to create an interface
2269 class Build_method_tables : public Traverse
2272 Build_method_tables(Gogo* gogo,
2273 const std::vector<Interface_type*>& interfaces)
2274 : Traverse(traverse_types),
2275 gogo_(gogo), interfaces_(interfaces)
2284 // A list of locally defined interfaces which have hidden methods.
2285 const std::vector<Interface_type*>& interfaces_;
2288 // Build all required interface method tables for types. We need to
2289 // ensure that we have an interface method table for every interface
2290 // which has a hidden method, for every named type which implements
2291 // that interface. Normally we can just build interface method tables
2292 // as we need them. However, in some cases we can require an
2293 // interface method table for an interface defined in a different
2294 // package for a type defined in that package. If that interface and
2295 // type both use a hidden method, that is OK. However, we will not be
2296 // able to build that interface method table when we need it, because
2297 // the type's hidden method will be static. So we have to build it
2298 // here, and just refer it from other packages as needed.
2301 Gogo::build_interface_method_tables()
2303 std::vector<Interface_type*> hidden_interfaces;
2304 hidden_interfaces.reserve(this->interface_types_.size());
2305 for (std::vector<Interface_type*>::const_iterator pi =
2306 this->interface_types_.begin();
2307 pi != this->interface_types_.end();
2310 const Typed_identifier_list* methods = (*pi)->methods();
2311 if (methods == NULL)
2313 for (Typed_identifier_list::const_iterator pm = methods->begin();
2314 pm != methods->end();
2317 if (Gogo::is_hidden_name(pm->name()))
2319 hidden_interfaces.push_back(*pi);
2325 if (!hidden_interfaces.empty())
2327 // Now traverse the tree looking for all named types.
2328 Build_method_tables bmt(this, hidden_interfaces);
2329 this->traverse(&bmt);
2332 // We no longer need the list of interfaces.
2334 this->interface_types_.clear();
2337 // This is called for each type. For a named type, for each of the
2338 // interfaces with hidden methods that it implements, create the
2342 Build_method_tables::type(Type* type)
2344 Named_type* nt = type->named_type();
2347 for (std::vector<Interface_type*>::const_iterator p =
2348 this->interfaces_.begin();
2349 p != this->interfaces_.end();
2352 // We ask whether a pointer to the named type implements the
2353 // interface, because a pointer can implement more methods
2355 if ((*p)->implements_interface(Type::make_pointer_type(nt), NULL))
2357 nt->interface_method_table(this->gogo_, *p, false);
2358 nt->interface_method_table(this->gogo_, *p, true);
2362 return TRAVERSE_CONTINUE;
2365 // Traversal class used to check for return statements.
2367 class Check_return_statements_traverse : public Traverse
2370 Check_return_statements_traverse()
2371 : Traverse(traverse_functions)
2375 function(Named_object*);
2378 // Check that a function has a return statement if it needs one.
2381 Check_return_statements_traverse::function(Named_object* no)
2383 Function* func = no->func_value();
2384 const Function_type* fntype = func->type();
2385 const Typed_identifier_list* results = fntype->results();
2387 // We only need a return statement if there is a return value.
2388 if (results == NULL || results->empty())
2389 return TRAVERSE_CONTINUE;
2391 if (func->block()->may_fall_through())
2392 error_at(func->location(), "control reaches end of non-void function");
2394 return TRAVERSE_CONTINUE;
2397 // Check return statements.
2400 Gogo::check_return_statements()
2402 Check_return_statements_traverse traverse;
2403 this->traverse(&traverse);
2406 // Get the unique prefix to use before all exported symbols. This
2407 // must be unique across the entire link.
2410 Gogo::unique_prefix() const
2412 gcc_assert(!this->unique_prefix_.empty());
2413 return this->unique_prefix_;
2416 // Set the unique prefix to use before all exported symbols. This
2417 // comes from the command line option -fgo-prefix=XXX.
2420 Gogo::set_unique_prefix(const std::string& arg)
2422 gcc_assert(this->unique_prefix_.empty());
2423 this->unique_prefix_ = arg;
2426 // Work out the package priority. It is one more than the maximum
2427 // priority of an imported package.
2430 Gogo::package_priority() const
2433 for (Packages::const_iterator p = this->packages_.begin();
2434 p != this->packages_.end();
2436 if (p->second->priority() > priority)
2437 priority = p->second->priority();
2438 return priority + 1;
2441 // Export identifiers as requested.
2446 // For now we always stream to a section. Later we may want to
2447 // support streaming to a separate file.
2448 Stream_to_section stream;
2450 Export exp(&stream);
2451 exp.register_builtin_types(this);
2452 exp.export_globals(this->package_name(),
2453 this->unique_prefix(),
2454 this->package_priority(),
2455 (this->need_init_fn_ && this->package_name() != "main"
2456 ? this->get_init_fn_name()
2458 this->imported_init_fns_,
2459 this->package_->bindings());
2464 Function::Function(Function_type* type, Function* enclosing, Block* block,
2465 source_location location)
2466 : type_(type), enclosing_(enclosing), named_results_(NULL),
2467 closure_var_(NULL), block_(block), location_(location), fndecl_(NULL),
2468 defer_stack_(NULL), calls_recover_(false), is_recover_thunk_(false),
2469 has_recover_thunk_(false)
2473 // Create the named result variables.
2476 Function::create_named_result_variables()
2478 const Typed_identifier_list* results = this->type_->results();
2481 || results->front().name().empty())
2484 this->named_results_ = new Named_results();
2485 this->named_results_->reserve(results->size());
2487 Block* block = this->block_;
2489 for (Typed_identifier_list::const_iterator p = results->begin();
2490 p != results->end();
2493 Result_variable* result = new Result_variable(p->type(), this,
2495 Named_object* no = block->bindings()->add_result_variable(p->name(),
2497 this->named_results_->push_back(no);
2501 // Return the closure variable, creating it if necessary.
2504 Function::closure_var()
2506 if (this->closure_var_ == NULL)
2508 // We don't know the type of the variable yet. We add fields as
2510 source_location loc = this->type_->location();
2511 Struct_field_list* sfl = new Struct_field_list;
2512 Type* struct_type = Type::make_struct_type(sfl, loc);
2513 Variable* var = new Variable(Type::make_pointer_type(struct_type),
2514 NULL, false, true, false, loc);
2515 this->closure_var_ = Named_object::make_variable("closure", NULL, var);
2516 // Note that the new variable is not in any binding contour.
2518 return this->closure_var_;
2521 // Set the type of the closure variable.
2524 Function::set_closure_type()
2526 if (this->closure_var_ == NULL)
2528 Named_object* closure = this->closure_var_;
2529 Struct_type* st = closure->var_value()->type()->deref()->struct_type();
2530 unsigned int index = 0;
2531 for (Closure_fields::const_iterator p = this->closure_fields_.begin();
2532 p != this->closure_fields_.end();
2535 Named_object* no = p->first;
2537 snprintf(buf, sizeof buf, "%u", index);
2538 std::string n = no->name() + buf;
2540 if (no->is_variable())
2541 var_type = no->var_value()->type();
2543 var_type = no->result_var_value()->type();
2544 Type* field_type = Type::make_pointer_type(var_type);
2545 st->push_field(Struct_field(Typed_identifier(n, field_type, p->second)));
2549 // Return whether this function is a method.
2552 Function::is_method() const
2554 return this->type_->is_method();
2557 // Add a label definition.
2560 Function::add_label_definition(const std::string& label_name,
2561 source_location location)
2563 Label* lnull = NULL;
2564 std::pair<Labels::iterator, bool> ins =
2565 this->labels_.insert(std::make_pair(label_name, lnull));
2568 // This is a new label.
2569 Label* label = new Label(label_name);
2570 label->define(location);
2571 ins.first->second = label;
2576 // The label was already in the hash table.
2577 Label* label = ins.first->second;
2578 if (!label->is_defined())
2580 label->define(location);
2585 error_at(location, "redefinition of label %qs",
2586 Gogo::message_name(label_name).c_str());
2587 inform(label->location(), "previous definition of %qs was here",
2588 Gogo::message_name(label_name).c_str());
2589 return new Label(label_name);
2594 // Add a reference to a label.
2597 Function::add_label_reference(const std::string& label_name)
2599 Label* lnull = NULL;
2600 std::pair<Labels::iterator, bool> ins =
2601 this->labels_.insert(std::make_pair(label_name, lnull));
2604 // The label was already in the hash table.
2605 return ins.first->second;
2609 gcc_assert(ins.first->second == NULL);
2610 Label* label = new Label(label_name);
2611 ins.first->second = label;
2616 // Swap one function with another. This is used when building the
2617 // thunk we use to call a function which calls recover. It may not
2618 // work for any other case.
2621 Function::swap_for_recover(Function *x)
2623 gcc_assert(this->enclosing_ == x->enclosing_);
2624 gcc_assert(this->named_results_ == x->named_results_);
2625 std::swap(this->closure_var_, x->closure_var_);
2626 std::swap(this->block_, x->block_);
2627 gcc_assert(this->location_ == x->location_);
2628 gcc_assert(this->fndecl_ == NULL && x->fndecl_ == NULL);
2629 gcc_assert(this->defer_stack_ == NULL && x->defer_stack_ == NULL);
2632 // Traverse the tree.
2635 Function::traverse(Traverse* traverse)
2637 unsigned int traverse_mask = traverse->traverse_mask();
2639 // FIXME: We should check traverse_functions here if nested
2640 // functions are stored in block bindings.
2641 if (this->block_ != NULL
2643 & (Traverse::traverse_variables
2644 | Traverse::traverse_constants
2645 | Traverse::traverse_blocks
2646 | Traverse::traverse_statements
2647 | Traverse::traverse_expressions
2648 | Traverse::traverse_types)) != 0)
2650 if (this->block_->traverse(traverse) == TRAVERSE_EXIT)
2651 return TRAVERSE_EXIT;
2654 return TRAVERSE_CONTINUE;
2657 // Work out types for unspecified variables and constants.
2660 Function::determine_types()
2662 if (this->block_ != NULL)
2663 this->block_->determine_types();
2666 // Export the function.
2669 Function::export_func(Export* exp, const std::string& name) const
2671 Function::export_func_with_type(exp, name, this->type_);
2674 // Export a function with a type.
2677 Function::export_func_with_type(Export* exp, const std::string& name,
2678 const Function_type* fntype)
2680 exp->write_c_string("func ");
2682 if (fntype->is_method())
2684 exp->write_c_string("(");
2685 exp->write_type(fntype->receiver()->type());
2686 exp->write_c_string(") ");
2689 exp->write_string(name);
2691 exp->write_c_string(" (");
2692 const Typed_identifier_list* parameters = fntype->parameters();
2693 if (parameters != NULL)
2695 bool is_varargs = fntype->is_varargs();
2697 for (Typed_identifier_list::const_iterator p = parameters->begin();
2698 p != parameters->end();
2704 exp->write_c_string(", ");
2705 if (!is_varargs || p + 1 != parameters->end())
2706 exp->write_type(p->type());
2709 exp->write_c_string("...");
2710 exp->write_type(p->type()->array_type()->element_type());
2714 exp->write_c_string(")");
2716 const Typed_identifier_list* results = fntype->results();
2717 if (results != NULL)
2719 if (results->size() == 1)
2721 exp->write_c_string(" ");
2722 exp->write_type(results->begin()->type());
2726 exp->write_c_string(" (");
2728 for (Typed_identifier_list::const_iterator p = results->begin();
2729 p != results->end();
2735 exp->write_c_string(", ");
2736 exp->write_type(p->type());
2738 exp->write_c_string(")");
2741 exp->write_c_string(";\n");
2744 // Import a function.
2747 Function::import_func(Import* imp, std::string* pname,
2748 Typed_identifier** preceiver,
2749 Typed_identifier_list** pparameters,
2750 Typed_identifier_list** presults,
2753 imp->require_c_string("func ");
2756 if (imp->peek_char() == '(')
2758 imp->require_c_string("(");
2759 Type* rtype = imp->read_type();
2760 *preceiver = new Typed_identifier(Import::import_marker, rtype,
2762 imp->require_c_string(") ");
2765 *pname = imp->read_identifier();
2767 Typed_identifier_list* parameters;
2768 *is_varargs = false;
2769 imp->require_c_string(" (");
2770 if (imp->peek_char() == ')')
2774 parameters = new Typed_identifier_list();
2777 if (imp->match_c_string("..."))
2783 Type* ptype = imp->read_type();
2785 ptype = Type::make_array_type(ptype, NULL);
2786 parameters->push_back(Typed_identifier(Import::import_marker,
2787 ptype, imp->location()));
2788 if (imp->peek_char() != ',')
2790 gcc_assert(!*is_varargs);
2791 imp->require_c_string(", ");
2794 imp->require_c_string(")");
2795 *pparameters = parameters;
2797 Typed_identifier_list* results;
2798 if (imp->peek_char() != ' ')
2802 results = new Typed_identifier_list();
2803 imp->require_c_string(" ");
2804 if (imp->peek_char() != '(')
2806 Type* rtype = imp->read_type();
2807 results->push_back(Typed_identifier(Import::import_marker, rtype,
2812 imp->require_c_string("(");
2815 Type* rtype = imp->read_type();
2816 results->push_back(Typed_identifier(Import::import_marker,
2817 rtype, imp->location()));
2818 if (imp->peek_char() != ',')
2820 imp->require_c_string(", ");
2822 imp->require_c_string(")");
2825 imp->require_c_string(";\n");
2826 *presults = results;
2831 Block::Block(Block* enclosing, source_location location)
2832 : enclosing_(enclosing), statements_(),
2833 bindings_(new Bindings(enclosing == NULL
2835 : enclosing->bindings())),
2836 start_location_(location),
2837 end_location_(UNKNOWN_LOCATION)
2841 // Add a statement to a block.
2844 Block::add_statement(Statement* statement)
2846 this->statements_.push_back(statement);
2849 // Add a statement to the front of a block. This is slow but is only
2850 // used for reference counts of parameters.
2853 Block::add_statement_at_front(Statement* statement)
2855 this->statements_.insert(this->statements_.begin(), statement);
2858 // Replace a statement in a block.
2861 Block::replace_statement(size_t index, Statement* s)
2863 gcc_assert(index < this->statements_.size());
2864 this->statements_[index] = s;
2867 // Add a statement before another statement.
2870 Block::insert_statement_before(size_t index, Statement* s)
2872 gcc_assert(index < this->statements_.size());
2873 this->statements_.insert(this->statements_.begin() + index, s);
2876 // Add a statement after another statement.
2879 Block::insert_statement_after(size_t index, Statement* s)
2881 gcc_assert(index < this->statements_.size());
2882 this->statements_.insert(this->statements_.begin() + index + 1, s);
2885 // Traverse the tree.
2888 Block::traverse(Traverse* traverse)
2890 unsigned int traverse_mask = traverse->traverse_mask();
2892 if ((traverse_mask & Traverse::traverse_blocks) != 0)
2894 int t = traverse->block(this);
2895 if (t == TRAVERSE_EXIT)
2896 return TRAVERSE_EXIT;
2897 else if (t == TRAVERSE_SKIP_COMPONENTS)
2898 return TRAVERSE_CONTINUE;
2902 & (Traverse::traverse_variables
2903 | Traverse::traverse_constants
2904 | Traverse::traverse_expressions
2905 | Traverse::traverse_types)) != 0)
2907 for (Bindings::const_definitions_iterator pb =
2908 this->bindings_->begin_definitions();
2909 pb != this->bindings_->end_definitions();
2912 switch ((*pb)->classification())
2914 case Named_object::NAMED_OBJECT_CONST:
2915 if ((traverse_mask & Traverse::traverse_constants) != 0)
2917 if (traverse->constant(*pb, false) == TRAVERSE_EXIT)
2918 return TRAVERSE_EXIT;
2920 if ((traverse_mask & Traverse::traverse_types) != 0
2921 || (traverse_mask & Traverse::traverse_expressions) != 0)
2923 Type* t = (*pb)->const_value()->type();
2925 && Type::traverse(t, traverse) == TRAVERSE_EXIT)
2926 return TRAVERSE_EXIT;
2928 if ((traverse_mask & Traverse::traverse_expressions) != 0
2929 || (traverse_mask & Traverse::traverse_types) != 0)
2931 if ((*pb)->const_value()->traverse_expression(traverse)
2933 return TRAVERSE_EXIT;
2937 case Named_object::NAMED_OBJECT_VAR:
2938 case Named_object::NAMED_OBJECT_RESULT_VAR:
2939 if ((traverse_mask & Traverse::traverse_variables) != 0)
2941 if (traverse->variable(*pb) == TRAVERSE_EXIT)
2942 return TRAVERSE_EXIT;
2944 if (((traverse_mask & Traverse::traverse_types) != 0
2945 || (traverse_mask & Traverse::traverse_expressions) != 0)
2946 && ((*pb)->is_result_variable()
2947 || (*pb)->var_value()->has_type()))
2949 Type* t = ((*pb)->is_variable()
2950 ? (*pb)->var_value()->type()
2951 : (*pb)->result_var_value()->type());
2953 && Type::traverse(t, traverse) == TRAVERSE_EXIT)
2954 return TRAVERSE_EXIT;
2956 if ((*pb)->is_variable()
2957 && ((traverse_mask & Traverse::traverse_expressions) != 0
2958 || (traverse_mask & Traverse::traverse_types) != 0))
2960 if ((*pb)->var_value()->traverse_expression(traverse)
2962 return TRAVERSE_EXIT;
2966 case Named_object::NAMED_OBJECT_FUNC:
2967 case Named_object::NAMED_OBJECT_FUNC_DECLARATION:
2968 // FIXME: Where will nested functions be found?
2971 case Named_object::NAMED_OBJECT_TYPE:
2972 if ((traverse_mask & Traverse::traverse_types) != 0
2973 || (traverse_mask & Traverse::traverse_expressions) != 0)
2975 if (Type::traverse((*pb)->type_value(), traverse)
2977 return TRAVERSE_EXIT;
2981 case Named_object::NAMED_OBJECT_TYPE_DECLARATION:
2982 case Named_object::NAMED_OBJECT_UNKNOWN:
2985 case Named_object::NAMED_OBJECT_PACKAGE:
2986 case Named_object::NAMED_OBJECT_SINK:
2995 // No point in checking traverse_mask here--if we got here we always
2996 // want to walk the statements. The traversal can insert new
2997 // statements before or after the current statement. Inserting
2998 // statements before the current statement requires updating I via
2999 // the pointer; those statements will not be traversed. Any new
3000 // statements inserted after the current statement will be traversed
3002 for (size_t i = 0; i < this->statements_.size(); ++i)
3004 if (this->statements_[i]->traverse(this, &i, traverse) == TRAVERSE_EXIT)
3005 return TRAVERSE_EXIT;
3008 return TRAVERSE_CONTINUE;
3011 // Work out types for unspecified variables and constants.
3014 Block::determine_types()
3016 for (Bindings::const_definitions_iterator pb =
3017 this->bindings_->begin_definitions();
3018 pb != this->bindings_->end_definitions();
3021 if ((*pb)->is_variable())
3022 (*pb)->var_value()->determine_type();
3023 else if ((*pb)->is_const())
3024 (*pb)->const_value()->determine_type();
3027 for (std::vector<Statement*>::const_iterator ps = this->statements_.begin();
3028 ps != this->statements_.end();
3030 (*ps)->determine_types();
3033 // Return true if the statements in this block may fall through.
3036 Block::may_fall_through() const
3038 if (this->statements_.empty())
3040 return this->statements_.back()->may_fall_through();
3045 Variable::Variable(Type* type, Expression* init, bool is_global,
3046 bool is_parameter, bool is_receiver,
3047 source_location location)
3048 : type_(type), init_(init), preinit_(NULL), location_(location),
3049 is_global_(is_global), is_parameter_(is_parameter),
3050 is_receiver_(is_receiver), is_varargs_parameter_(false),
3051 is_address_taken_(false), init_is_lowered_(false),
3052 type_from_init_tuple_(false), type_from_range_index_(false),
3053 type_from_range_value_(false), type_from_chan_element_(false),
3054 is_type_switch_var_(false)
3056 gcc_assert(type != NULL || init != NULL);
3057 gcc_assert(!is_parameter || init == NULL);
3060 // Traverse the initializer expression.
3063 Variable::traverse_expression(Traverse* traverse)
3065 if (this->preinit_ != NULL)
3067 if (this->preinit_->traverse(traverse) == TRAVERSE_EXIT)
3068 return TRAVERSE_EXIT;
3070 if (this->init_ != NULL)
3072 if (Expression::traverse(&this->init_, traverse) == TRAVERSE_EXIT)
3073 return TRAVERSE_EXIT;
3075 return TRAVERSE_CONTINUE;
3078 // Lower the initialization expression after parsing is complete.
3081 Variable::lower_init_expression(Gogo* gogo, Named_object* function)
3083 if (this->init_ != NULL && !this->init_is_lowered_)
3085 gogo->lower_expression(function, &this->init_);
3086 this->init_is_lowered_ = true;
3090 // Get the preinit block.
3093 Variable::preinit_block()
3095 gcc_assert(this->is_global_);
3096 if (this->preinit_ == NULL)
3097 this->preinit_ = new Block(NULL, this->location());
3098 return this->preinit_;
3101 // Add a statement to be run before the initialization expression.
3104 Variable::add_preinit_statement(Statement* s)
3106 Block* b = this->preinit_block();
3107 b->add_statement(s);
3108 b->set_end_location(s->location());
3111 // In an assignment which sets a variable to a tuple of EXPR, return
3112 // the type of the first element of the tuple.
3115 Variable::type_from_tuple(Expression* expr, bool report_error) const
3117 if (expr->map_index_expression() != NULL)
3118 return expr->map_index_expression()->get_map_type()->val_type();
3119 else if (expr->receive_expression() != NULL)
3121 Expression* channel = expr->receive_expression()->channel();
3122 return channel->type()->channel_type()->element_type();
3127 error_at(this->location(), "invalid tuple definition");
3128 return Type::make_error_type();
3132 // Given EXPR used in a range clause, return either the index type or
3133 // the value type of the range, depending upon GET_INDEX_TYPE.
3136 Variable::type_from_range(Expression* expr, bool get_index_type,
3137 bool report_error) const
3139 Type* t = expr->type();
3140 if (t->array_type() != NULL
3141 || (t->points_to() != NULL
3142 && t->points_to()->array_type() != NULL
3143 && !t->points_to()->is_open_array_type()))
3146 return Type::lookup_integer_type("int");
3148 return t->deref()->array_type()->element_type();
3150 else if (t->is_string_type())
3151 return Type::lookup_integer_type("int");
3152 else if (t->map_type() != NULL)
3155 return t->map_type()->key_type();
3157 return t->map_type()->val_type();
3159 else if (t->channel_type() != NULL)
3162 return t->channel_type()->element_type();
3166 error_at(this->location(),
3167 "invalid definition of value variable for channel range");
3168 return Type::make_error_type();
3174 error_at(this->location(), "invalid type for range clause");
3175 return Type::make_error_type();
3179 // EXPR should be a channel. Return the channel's element type.
3182 Variable::type_from_chan_element(Expression* expr, bool report_error) const
3184 Type* t = expr->type();
3185 if (t->channel_type() != NULL)
3186 return t->channel_type()->element_type();
3190 error_at(this->location(), "expected channel");
3191 return Type::make_error_type();
3195 // Return the type of the Variable. This may be called before
3196 // Variable::determine_type is called, which means that we may need to
3197 // get the type from the initializer. FIXME: If we combine lowering
3198 // with type determination, then this should be unnecessary.
3201 Variable::type() const
3203 // A variable in a type switch with a nil case will have the wrong
3204 // type here. This gets fixed up in determine_type, below.
3205 Type* type = this->type_;
3206 Expression* init = this->init_;
3207 if (this->is_type_switch_var_
3208 && this->type_->is_nil_constant_as_type())
3210 Type_guard_expression* tge = this->init_->type_guard_expression();
3211 gcc_assert(tge != NULL);
3218 else if (this->type_from_init_tuple_)
3219 return this->type_from_tuple(init, false);
3220 else if (this->type_from_range_index_ || this->type_from_range_value_)
3221 return this->type_from_range(init, this->type_from_range_index_, false);
3222 else if (this->type_from_chan_element_)
3223 return this->type_from_chan_element(init, false);
3226 gcc_assert(init != NULL);
3227 type = init->type();
3228 gcc_assert(type != NULL);
3230 // Variables should not have abstract types.
3231 if (type->is_abstract())
3232 type = type->make_non_abstract_type();
3234 if (type->is_void_type())
3235 type = Type::make_error_type();
3241 // Set the type if necessary.
3244 Variable::determine_type()
3246 // A variable in a type switch with a nil case will have the wrong
3247 // type here. It will have an initializer which is a type guard.
3248 // We want to initialize it to the value without the type guard, and
3249 // use the type of that value as well.
3250 if (this->is_type_switch_var_ && this->type_->is_nil_constant_as_type())
3252 Type_guard_expression* tge = this->init_->type_guard_expression();
3253 gcc_assert(tge != NULL);
3255 this->init_ = tge->expr();
3258 if (this->init_ == NULL)
3259 gcc_assert(this->type_ != NULL && !this->type_->is_abstract());
3260 else if (this->type_from_init_tuple_)
3262 Expression *init = this->init_;
3263 init->determine_type_no_context();
3264 this->type_ = this->type_from_tuple(init, true);
3267 else if (this->type_from_range_index_ || this->type_from_range_value_)
3269 Expression* init = this->init_;
3270 init->determine_type_no_context();
3271 this->type_ = this->type_from_range(init, this->type_from_range_index_,
3277 // type_from_chan_element_ should have been cleared during
3279 gcc_assert(!this->type_from_chan_element_);
3281 Type_context context(this->type_, false);
3282 this->init_->determine_type(&context);
3283 if (this->type_ == NULL)
3285 Type* type = this->init_->type();
3286 gcc_assert(type != NULL);
3287 if (type->is_abstract())
3288 type = type->make_non_abstract_type();
3290 if (type->is_void_type())
3292 error_at(this->location_, "variable has no type");
3293 type = Type::make_error_type();
3295 else if (type->is_nil_type())
3297 error_at(this->location_, "variable defined to nil type");
3298 type = Type::make_error_type();
3300 else if (type->is_call_multiple_result_type())
3302 error_at(this->location_,
3303 "single variable set to multiple value function call");
3304 type = Type::make_error_type();
3312 // Export the variable
3315 Variable::export_var(Export* exp, const std::string& name) const
3317 gcc_assert(this->is_global_);
3318 exp->write_c_string("var ");
3319 exp->write_string(name);
3320 exp->write_c_string(" ");
3321 exp->write_type(this->type());
3322 exp->write_c_string(";\n");
3325 // Import a variable.
3328 Variable::import_var(Import* imp, std::string* pname, Type** ptype)
3330 imp->require_c_string("var ");
3331 *pname = imp->read_identifier();
3332 imp->require_c_string(" ");
3333 *ptype = imp->read_type();
3334 imp->require_c_string(";\n");
3337 // Class Named_constant.
3339 // Traverse the initializer expression.
3342 Named_constant::traverse_expression(Traverse* traverse)
3344 return Expression::traverse(&this->expr_, traverse);
3347 // Determine the type of the constant.
3350 Named_constant::determine_type()
3352 if (this->type_ != NULL)
3354 Type_context context(this->type_, false);
3355 this->expr_->determine_type(&context);
3359 // A constant may have an abstract type.
3360 Type_context context(NULL, true);
3361 this->expr_->determine_type(&context);
3362 this->type_ = this->expr_->type();
3363 gcc_assert(this->type_ != NULL);
3367 // Indicate that we found and reported an error for this constant.
3370 Named_constant::set_error()
3372 this->type_ = Type::make_error_type();
3373 this->expr_ = Expression::make_error(this->location_);
3376 // Export a constant.
3379 Named_constant::export_const(Export* exp, const std::string& name) const
3381 exp->write_c_string("const ");
3382 exp->write_string(name);
3383 exp->write_c_string(" ");
3384 if (!this->type_->is_abstract())
3386 exp->write_type(this->type_);
3387 exp->write_c_string(" ");
3389 exp->write_c_string("= ");
3390 this->expr()->export_expression(exp);
3391 exp->write_c_string(";\n");
3394 // Import a constant.
3397 Named_constant::import_const(Import* imp, std::string* pname, Type** ptype,
3400 imp->require_c_string("const ");
3401 *pname = imp->read_identifier();
3402 imp->require_c_string(" ");
3403 if (imp->peek_char() == '=')
3407 *ptype = imp->read_type();
3408 imp->require_c_string(" ");
3410 imp->require_c_string("= ");
3411 *pexpr = Expression::import_expression(imp);
3412 imp->require_c_string(";\n");
3418 Type_declaration::add_method(const std::string& name, Function* function)
3420 Named_object* ret = Named_object::make_function(name, NULL, function);
3421 this->methods_.push_back(ret);
3425 // Add a method declaration.
3428 Type_declaration::add_method_declaration(const std::string& name,
3429 Function_type* type,
3430 source_location location)
3432 Named_object* ret = Named_object::make_function_declaration(name, NULL, type,
3434 this->methods_.push_back(ret);
3438 // Return whether any methods ere defined.
3441 Type_declaration::has_methods() const
3443 return !this->methods_.empty();
3446 // Define methods for the real type.
3449 Type_declaration::define_methods(Named_type* nt)
3451 for (Methods::const_iterator p = this->methods_.begin();
3452 p != this->methods_.end();
3454 nt->add_existing_method(*p);
3457 // We are using the type. Return true if we should issue a warning.
3460 Type_declaration::using_type()
3462 bool ret = !this->issued_warning_;
3463 this->issued_warning_ = true;
3467 // Class Unknown_name.
3469 // Set the real named object.
3472 Unknown_name::set_real_named_object(Named_object* no)
3474 gcc_assert(this->real_named_object_ == NULL);
3475 gcc_assert(!no->is_unknown());
3476 this->real_named_object_ = no;
3479 // Class Named_object.
3481 Named_object::Named_object(const std::string& name,
3482 const Package* package,
3483 Classification classification)
3484 : name_(name), package_(package), classification_(classification),
3487 if (Gogo::is_sink_name(name))
3488 gcc_assert(classification == NAMED_OBJECT_SINK);
3491 // Make an unknown name. This is used by the parser. The name must
3492 // be resolved later. Unknown names are only added in the current
3496 Named_object::make_unknown_name(const std::string& name,
3497 source_location location)
3499 Named_object* named_object = new Named_object(name, NULL,
3500 NAMED_OBJECT_UNKNOWN);
3501 Unknown_name* value = new Unknown_name(location);
3502 named_object->u_.unknown_value = value;
3503 return named_object;
3509 Named_object::make_constant(const Typed_identifier& tid,
3510 const Package* package, Expression* expr,
3513 Named_object* named_object = new Named_object(tid.name(), package,
3514 NAMED_OBJECT_CONST);
3515 Named_constant* named_constant = new Named_constant(tid.type(), expr,
3518 named_object->u_.const_value = named_constant;
3519 return named_object;
3522 // Make a named type.
3525 Named_object::make_type(const std::string& name, const Package* package,
3526 Type* type, source_location location)
3528 Named_object* named_object = new Named_object(name, package,
3530 Named_type* named_type = Type::make_named_type(named_object, type, location);
3531 named_object->u_.type_value = named_type;
3532 return named_object;
3535 // Make a type declaration.
3538 Named_object::make_type_declaration(const std::string& name,
3539 const Package* package,
3540 source_location location)
3542 Named_object* named_object = new Named_object(name, package,
3543 NAMED_OBJECT_TYPE_DECLARATION);
3544 Type_declaration* type_declaration = new Type_declaration(location);
3545 named_object->u_.type_declaration = type_declaration;
3546 return named_object;
3552 Named_object::make_variable(const std::string& name, const Package* package,
3555 Named_object* named_object = new Named_object(name, package,
3557 named_object->u_.var_value = variable;
3558 return named_object;
3561 // Make a result variable.
3564 Named_object::make_result_variable(const std::string& name,
3565 Result_variable* result)
3567 Named_object* named_object = new Named_object(name, NULL,
3568 NAMED_OBJECT_RESULT_VAR);
3569 named_object->u_.result_var_value = result;
3570 return named_object;
3573 // Make a sink. This is used for the special blank identifier _.
3576 Named_object::make_sink()
3578 return new Named_object("_", NULL, NAMED_OBJECT_SINK);
3581 // Make a named function.
3584 Named_object::make_function(const std::string& name, const Package* package,
3587 Named_object* named_object = new Named_object(name, package,
3589 named_object->u_.func_value = function;
3590 return named_object;
3593 // Make a function declaration.
3596 Named_object::make_function_declaration(const std::string& name,
3597 const Package* package,
3598 Function_type* fntype,
3599 source_location location)
3601 Named_object* named_object = new Named_object(name, package,
3602 NAMED_OBJECT_FUNC_DECLARATION);
3603 Function_declaration *func_decl = new Function_declaration(fntype, location);
3604 named_object->u_.func_declaration_value = func_decl;
3605 return named_object;
3611 Named_object::make_package(const std::string& alias, Package* package)
3613 Named_object* named_object = new Named_object(alias, NULL,
3614 NAMED_OBJECT_PACKAGE);
3615 named_object->u_.package_value = package;
3616 return named_object;
3619 // Return the name to use in an error message.
3622 Named_object::message_name() const
3624 if (this->package_ == NULL)
3625 return Gogo::message_name(this->name_);
3626 std::string ret = Gogo::message_name(this->package_->name());
3628 ret += Gogo::message_name(this->name_);
3632 // Set the type when a declaration is defined.
3635 Named_object::set_type_value(Named_type* named_type)
3637 gcc_assert(this->classification_ == NAMED_OBJECT_TYPE_DECLARATION);
3638 Type_declaration* td = this->u_.type_declaration;
3639 td->define_methods(named_type);
3640 Named_object* in_function = td->in_function();
3641 if (in_function != NULL)
3642 named_type->set_in_function(in_function);
3644 this->classification_ = NAMED_OBJECT_TYPE;
3645 this->u_.type_value = named_type;
3648 // Define a function which was previously declared.
3651 Named_object::set_function_value(Function* function)
3653 gcc_assert(this->classification_ == NAMED_OBJECT_FUNC_DECLARATION);
3654 this->classification_ = NAMED_OBJECT_FUNC;
3655 // FIXME: We should free the old value.
3656 this->u_.func_value = function;
3659 // Return the location of a named object.
3662 Named_object::location() const
3664 switch (this->classification_)
3667 case NAMED_OBJECT_UNINITIALIZED:
3670 case NAMED_OBJECT_UNKNOWN:
3671 return this->unknown_value()->location();
3673 case NAMED_OBJECT_CONST:
3674 return this->const_value()->location();
3676 case NAMED_OBJECT_TYPE:
3677 return this->type_value()->location();
3679 case NAMED_OBJECT_TYPE_DECLARATION:
3680 return this->type_declaration_value()->location();
3682 case NAMED_OBJECT_VAR:
3683 return this->var_value()->location();
3685 case NAMED_OBJECT_RESULT_VAR:
3686 return this->result_var_value()->function()->location();
3688 case NAMED_OBJECT_SINK:
3691 case NAMED_OBJECT_FUNC:
3692 return this->func_value()->location();
3694 case NAMED_OBJECT_FUNC_DECLARATION:
3695 return this->func_declaration_value()->location();
3697 case NAMED_OBJECT_PACKAGE:
3698 return this->package_value()->location();
3702 // Export a named object.
3705 Named_object::export_named_object(Export* exp) const
3707 switch (this->classification_)
3710 case NAMED_OBJECT_UNINITIALIZED:
3711 case NAMED_OBJECT_UNKNOWN:
3714 case NAMED_OBJECT_CONST:
3715 this->const_value()->export_const(exp, this->name_);
3718 case NAMED_OBJECT_TYPE:
3719 this->type_value()->export_named_type(exp, this->name_);
3722 case NAMED_OBJECT_TYPE_DECLARATION:
3723 error_at(this->type_declaration_value()->location(),
3724 "attempt to export %<%s%> which was declared but not defined",
3725 this->message_name().c_str());
3728 case NAMED_OBJECT_FUNC_DECLARATION:
3729 this->func_declaration_value()->export_func(exp, this->name_);
3732 case NAMED_OBJECT_VAR:
3733 this->var_value()->export_var(exp, this->name_);
3736 case NAMED_OBJECT_RESULT_VAR:
3737 case NAMED_OBJECT_SINK:
3740 case NAMED_OBJECT_FUNC:
3741 this->func_value()->export_func(exp, this->name_);
3748 Bindings::Bindings(Bindings* enclosing)
3749 : enclosing_(enclosing), named_objects_(), bindings_()
3756 Bindings::clear_file_scope()
3758 Contour::iterator p = this->bindings_.begin();
3759 while (p != this->bindings_.end())
3762 if (p->second->package() != NULL)
3764 else if (p->second->is_package())
3766 else if (p->second->is_function()
3767 && !p->second->func_value()->type()->is_method()
3768 && Gogo::unpack_hidden_name(p->second->name()) == "init")
3776 p = this->bindings_.erase(p);
3780 // Look up a symbol.
3783 Bindings::lookup(const std::string& name) const
3785 Contour::const_iterator p = this->bindings_.find(name);
3786 if (p != this->bindings_.end())
3787 return p->second->resolve();
3788 else if (this->enclosing_ != NULL)
3789 return this->enclosing_->lookup(name);
3794 // Look up a symbol locally.
3797 Bindings::lookup_local(const std::string& name) const
3799 Contour::const_iterator p = this->bindings_.find(name);
3800 if (p == this->bindings_.end())
3805 // Remove an object from a set of bindings. This is used for a
3806 // special case in thunks for functions which call recover.
3809 Bindings::remove_binding(Named_object* no)
3811 Contour::iterator pb = this->bindings_.find(no->name());
3812 gcc_assert(pb != this->bindings_.end());
3813 this->bindings_.erase(pb);
3814 for (std::vector<Named_object*>::iterator pn = this->named_objects_.begin();
3815 pn != this->named_objects_.end();
3820 this->named_objects_.erase(pn);
3827 // Add a method to the list of objects. This is not added to the
3828 // lookup table. This is so that we have a single list of objects
3829 // declared at the top level, which we walk through when it's time to
3830 // convert to trees.
3833 Bindings::add_method(Named_object* method)
3835 this->named_objects_.push_back(method);
3838 // Add a generic Named_object to a Contour.
3841 Bindings::add_named_object_to_contour(Contour* contour,
3842 Named_object* named_object)
3844 gcc_assert(named_object == named_object->resolve());
3845 const std::string& name(named_object->name());
3846 gcc_assert(!Gogo::is_sink_name(name));
3848 std::pair<Contour::iterator, bool> ins =
3849 contour->insert(std::make_pair(name, named_object));
3852 // The name was already there.
3853 if (named_object->package() != NULL
3854 && ins.first->second->package() == named_object->package()
3855 && (ins.first->second->classification()
3856 == named_object->classification()))
3858 // This is a second import of the same object.
3859 return ins.first->second;
3861 ins.first->second = this->new_definition(ins.first->second,
3863 return ins.first->second;
3867 // Don't push declarations on the list. We push them on when
3868 // and if we find the definitions. That way we genericize the
3869 // functions in order.
3870 if (!named_object->is_type_declaration()
3871 && !named_object->is_function_declaration()
3872 && !named_object->is_unknown())
3873 this->named_objects_.push_back(named_object);
3874 return named_object;
3878 // We had an existing named object OLD_OBJECT, and we've seen a new
3879 // one NEW_OBJECT with the same name. FIXME: This does not free the
3880 // new object when we don't need it.
3883 Bindings::new_definition(Named_object* old_object, Named_object* new_object)
3886 switch (old_object->classification())
3889 case Named_object::NAMED_OBJECT_UNINITIALIZED:
3892 case Named_object::NAMED_OBJECT_UNKNOWN:
3894 Named_object* real = old_object->unknown_value()->real_named_object();
3896 return this->new_definition(real, new_object);
3897 gcc_assert(!new_object->is_unknown());
3898 old_object->unknown_value()->set_real_named_object(new_object);
3899 if (!new_object->is_type_declaration()
3900 && !new_object->is_function_declaration())
3901 this->named_objects_.push_back(new_object);
3905 case Named_object::NAMED_OBJECT_CONST:
3908 case Named_object::NAMED_OBJECT_TYPE:
3909 if (new_object->is_type_declaration())
3913 case Named_object::NAMED_OBJECT_TYPE_DECLARATION:
3914 if (new_object->is_type_declaration())
3916 if (new_object->is_type())
3918 old_object->set_type_value(new_object->type_value());
3919 new_object->type_value()->set_named_object(old_object);
3920 this->named_objects_.push_back(old_object);
3925 case Named_object::NAMED_OBJECT_VAR:
3926 case Named_object::NAMED_OBJECT_RESULT_VAR:
3929 case Named_object::NAMED_OBJECT_SINK:
3932 case Named_object::NAMED_OBJECT_FUNC:
3933 if (new_object->is_function_declaration())
3935 if (!new_object->func_declaration_value()->asm_name().empty())
3936 sorry("__asm__ for function definitions");
3937 Function_type* old_type = old_object->func_value()->type();
3938 Function_type* new_type =
3939 new_object->func_declaration_value()->type();
3940 if (old_type->is_valid_redeclaration(new_type, &reason))
3945 case Named_object::NAMED_OBJECT_FUNC_DECLARATION:
3947 Function_type* old_type = old_object->func_declaration_value()->type();
3948 if (new_object->is_function_declaration())
3950 Function_type* new_type =
3951 new_object->func_declaration_value()->type();
3952 if (old_type->is_valid_redeclaration(new_type, &reason))
3955 if (new_object->is_function())
3957 Function_type* new_type = new_object->func_value()->type();
3958 if (old_type->is_valid_redeclaration(new_type, &reason))
3960 if (!old_object->func_declaration_value()->asm_name().empty())
3961 sorry("__asm__ for function definitions");
3962 old_object->set_function_value(new_object->func_value());
3963 this->named_objects_.push_back(old_object);
3970 case Named_object::NAMED_OBJECT_PACKAGE:
3971 if (new_object->is_package()
3972 && (old_object->package_value()->name()
3973 == new_object->package_value()->name()))
3979 std::string n = old_object->message_name();
3981 error_at(new_object->location(), "redefinition of %qs", n.c_str());
3983 error_at(new_object->location(), "redefinition of %qs: %s", n.c_str(),
3986 inform(old_object->location(), "previous definition of %qs was here",
3992 // Add a named type.
3995 Bindings::add_named_type(Named_type* named_type)
3997 return this->add_named_object(named_type->named_object());
4003 Bindings::add_function(const std::string& name, const Package* package,
4006 return this->add_named_object(Named_object::make_function(name, package,
4010 // Add a function declaration.
4013 Bindings::add_function_declaration(const std::string& name,
4014 const Package* package,
4015 Function_type* type,
4016 source_location location)
4018 Named_object* no = Named_object::make_function_declaration(name, package,
4020 return this->add_named_object(no);
4023 // Define a type which was previously declared.
4026 Bindings::define_type(Named_object* no, Named_type* type)
4028 no->set_type_value(type);
4029 this->named_objects_.push_back(no);
4032 // Traverse bindings.
4035 Bindings::traverse(Traverse* traverse, bool is_global)
4037 unsigned int traverse_mask = traverse->traverse_mask();
4039 // We don't use an iterator because we permit the traversal to add
4040 // new global objects.
4041 for (size_t i = 0; i < this->named_objects_.size(); ++i)
4043 Named_object* p = this->named_objects_[i];
4044 switch (p->classification())
4046 case Named_object::NAMED_OBJECT_CONST:
4047 if ((traverse_mask & Traverse::traverse_constants) != 0)
4049 if (traverse->constant(p, is_global) == TRAVERSE_EXIT)
4050 return TRAVERSE_EXIT;
4052 if ((traverse_mask & Traverse::traverse_types) != 0
4053 || (traverse_mask & Traverse::traverse_expressions) != 0)
4055 Type* t = p->const_value()->type();
4057 && Type::traverse(t, traverse) == TRAVERSE_EXIT)
4058 return TRAVERSE_EXIT;
4060 if ((traverse_mask & Traverse::traverse_expressions) != 0)
4062 if (p->const_value()->traverse_expression(traverse)
4064 return TRAVERSE_EXIT;
4068 case Named_object::NAMED_OBJECT_VAR:
4069 case Named_object::NAMED_OBJECT_RESULT_VAR:
4070 if ((traverse_mask & Traverse::traverse_variables) != 0)
4072 if (traverse->variable(p) == TRAVERSE_EXIT)
4073 return TRAVERSE_EXIT;
4075 if (((traverse_mask & Traverse::traverse_types) != 0
4076 || (traverse_mask & Traverse::traverse_expressions) != 0)
4077 && (p->is_result_variable()
4078 || p->var_value()->has_type()))
4080 Type* t = (p->is_variable()
4081 ? p->var_value()->type()
4082 : p->result_var_value()->type());
4084 && Type::traverse(t, traverse) == TRAVERSE_EXIT)
4085 return TRAVERSE_EXIT;
4087 if (p->is_variable()
4088 && (traverse_mask & Traverse::traverse_expressions) != 0)
4090 if (p->var_value()->traverse_expression(traverse)
4092 return TRAVERSE_EXIT;
4096 case Named_object::NAMED_OBJECT_FUNC:
4097 if ((traverse_mask & Traverse::traverse_functions) != 0)
4099 int t = traverse->function(p);
4100 if (t == TRAVERSE_EXIT)
4101 return TRAVERSE_EXIT;
4102 else if (t == TRAVERSE_SKIP_COMPONENTS)
4107 & (Traverse::traverse_variables
4108 | Traverse::traverse_constants
4109 | Traverse::traverse_functions
4110 | Traverse::traverse_blocks
4111 | Traverse::traverse_statements
4112 | Traverse::traverse_expressions
4113 | Traverse::traverse_types)) != 0)
4115 if (p->func_value()->traverse(traverse) == TRAVERSE_EXIT)
4116 return TRAVERSE_EXIT;
4120 case Named_object::NAMED_OBJECT_PACKAGE:
4121 // These are traversed in Gogo::traverse.
4122 gcc_assert(is_global);
4125 case Named_object::NAMED_OBJECT_TYPE:
4126 if ((traverse_mask & Traverse::traverse_types) != 0
4127 || (traverse_mask & Traverse::traverse_expressions) != 0)
4129 if (Type::traverse(p->type_value(), traverse) == TRAVERSE_EXIT)
4130 return TRAVERSE_EXIT;
4134 case Named_object::NAMED_OBJECT_TYPE_DECLARATION:
4135 case Named_object::NAMED_OBJECT_FUNC_DECLARATION:
4136 case Named_object::NAMED_OBJECT_UNKNOWN:
4139 case Named_object::NAMED_OBJECT_SINK:
4145 return TRAVERSE_CONTINUE;
4150 Package::Package(const std::string& name, const std::string& unique_prefix,
4151 source_location location)
4152 : name_(name), unique_prefix_(unique_prefix), bindings_(new Bindings(NULL)),
4153 priority_(0), location_(location), used_(false), is_imported_(false),
4154 uses_sink_alias_(false)
4156 gcc_assert(!name.empty() && !unique_prefix.empty());
4159 // Set the priority. We may see multiple priorities for an imported
4160 // package; we want to use the largest one.
4163 Package::set_priority(int priority)
4165 if (priority > this->priority_)
4166 this->priority_ = priority;
4169 // Determine types of constants. Everything else in a package
4170 // (variables, function declarations) should already have a fixed
4171 // type. Constants may have abstract types.
4174 Package::determine_types()
4176 Bindings* bindings = this->bindings_;
4177 for (Bindings::const_definitions_iterator p = bindings->begin_definitions();
4178 p != bindings->end_definitions();
4181 if ((*p)->is_const())
4182 (*p)->const_value()->determine_type();
4190 Traverse::~Traverse()
4192 if (this->types_seen_ != NULL)
4193 delete this->types_seen_;
4194 if (this->expressions_seen_ != NULL)
4195 delete this->expressions_seen_;
4198 // Record that we are looking at a type, and return true if we have
4202 Traverse::remember_type(const Type* type)
4204 gcc_assert((this->traverse_mask() & traverse_types) != 0
4205 || (this->traverse_mask() & traverse_expressions) != 0);
4206 // We only have to remember named types, as they are the only ones
4207 // we can see multiple times in a traversal.
4208 if (type->classification() != Type::TYPE_NAMED)
4210 if (this->types_seen_ == NULL)
4211 this->types_seen_ = new Types_seen();
4212 std::pair<Types_seen::iterator, bool> ins = this->types_seen_->insert(type);
4216 // Record that we are looking at an expression, and return true if we
4217 // have already seen it.
4220 Traverse::remember_expression(const Expression* expression)
4222 gcc_assert((this->traverse_mask() & traverse_types) != 0
4223 || (this->traverse_mask() & traverse_expressions) != 0);
4224 if (this->expressions_seen_ == NULL)
4225 this->expressions_seen_ = new Expressions_seen();
4226 std::pair<Expressions_seen::iterator, bool> ins =
4227 this->expressions_seen_->insert(expression);
4231 // The default versions of these functions should never be called: the
4232 // traversal mask indicates which functions may be called.
4235 Traverse::variable(Named_object*)
4241 Traverse::constant(Named_object*, bool)
4247 Traverse::function(Named_object*)
4253 Traverse::block(Block*)
4259 Traverse::statement(Block*, size_t*, Statement*)
4265 Traverse::expression(Expression**)
4271 Traverse::type(Type*)