1 // gogo.cc -- Go frontend parsed representation.
3 // Copyright 2009 The Go Authors. All rights reserved.
4 // Use of this source code is governed by a BSD-style
5 // license that can be found in the LICENSE file.
13 #include "statements.h"
14 #include "expressions.h"
22 Gogo::Gogo(int int_type_size, int float_type_size, int pointer_size)
25 globals_(new Bindings(NULL)),
27 imported_unsafe_(false),
29 map_descriptors_(NULL),
30 type_descriptor_decls_(NULL),
38 const source_location loc = BUILTINS_LOCATION;
40 Named_type* uint8_type = Type::make_integer_type("uint8", true, 8,
41 RUNTIME_TYPE_KIND_UINT8);
42 this->add_named_type(uint8_type);
43 this->add_named_type(Type::make_integer_type("uint16", true, 16,
44 RUNTIME_TYPE_KIND_UINT16));
45 this->add_named_type(Type::make_integer_type("uint32", true, 32,
46 RUNTIME_TYPE_KIND_UINT32));
47 this->add_named_type(Type::make_integer_type("uint64", true, 64,
48 RUNTIME_TYPE_KIND_UINT64));
50 this->add_named_type(Type::make_integer_type("int8", false, 8,
51 RUNTIME_TYPE_KIND_INT8));
52 this->add_named_type(Type::make_integer_type("int16", false, 16,
53 RUNTIME_TYPE_KIND_INT16));
54 this->add_named_type(Type::make_integer_type("int32", false, 32,
55 RUNTIME_TYPE_KIND_INT32));
56 this->add_named_type(Type::make_integer_type("int64", false, 64,
57 RUNTIME_TYPE_KIND_INT64));
59 this->add_named_type(Type::make_float_type("float32", 32,
60 RUNTIME_TYPE_KIND_FLOAT32));
61 this->add_named_type(Type::make_float_type("float64", 64,
62 RUNTIME_TYPE_KIND_FLOAT64));
64 this->add_named_type(Type::make_complex_type("complex64", 64,
65 RUNTIME_TYPE_KIND_COMPLEX64));
66 this->add_named_type(Type::make_complex_type("complex128", 128,
67 RUNTIME_TYPE_KIND_COMPLEX128));
69 if (int_type_size < 32)
71 this->add_named_type(Type::make_integer_type("uint", true,
73 RUNTIME_TYPE_KIND_UINT));
74 Named_type* int_type = Type::make_integer_type("int", false, int_type_size,
75 RUNTIME_TYPE_KIND_INT);
76 this->add_named_type(int_type);
78 // "byte" is an alias for "uint8". Construct a Named_object which
79 // points to UINT8_TYPE. Note that this breaks the normal pairing
80 // in which a Named_object points to a Named_type which points back
81 // to the same Named_object.
82 Named_object* byte_type = this->declare_type("byte", loc);
83 byte_type->set_type_value(uint8_type);
85 this->add_named_type(Type::make_integer_type("uintptr", true,
87 RUNTIME_TYPE_KIND_UINTPTR));
89 this->add_named_type(Type::make_float_type("float", float_type_size,
90 RUNTIME_TYPE_KIND_FLOAT));
92 this->add_named_type(Type::make_complex_type("complex", float_type_size * 2,
93 RUNTIME_TYPE_KIND_COMPLEX));
95 this->add_named_type(Type::make_named_bool_type());
97 this->add_named_type(Type::make_named_string_type());
99 this->globals_->add_constant(Typed_identifier("true",
100 Type::make_boolean_type(),
103 Expression::make_boolean(true, loc),
105 this->globals_->add_constant(Typed_identifier("false",
106 Type::make_boolean_type(),
109 Expression::make_boolean(false, loc),
112 this->globals_->add_constant(Typed_identifier("nil", Type::make_nil_type(),
115 Expression::make_nil(loc),
118 Type* abstract_int_type = Type::make_abstract_integer_type();
119 this->globals_->add_constant(Typed_identifier("iota", abstract_int_type,
122 Expression::make_iota(),
125 Function_type* new_type = Type::make_function_type(NULL, NULL, NULL, loc);
126 new_type->set_is_varargs();
127 new_type->set_is_builtin();
128 this->globals_->add_function_declaration("new", NULL, new_type, loc);
130 Function_type* make_type = Type::make_function_type(NULL, NULL, NULL, loc);
131 make_type->set_is_varargs();
132 make_type->set_is_builtin();
133 this->globals_->add_function_declaration("make", NULL, make_type, loc);
135 Typed_identifier_list* len_result = new Typed_identifier_list();
136 len_result->push_back(Typed_identifier("", int_type, loc));
137 Function_type* len_type = Type::make_function_type(NULL, NULL, len_result,
139 len_type->set_is_builtin();
140 this->globals_->add_function_declaration("len", NULL, len_type, loc);
142 Typed_identifier_list* cap_result = new Typed_identifier_list();
143 cap_result->push_back(Typed_identifier("", int_type, loc));
144 Function_type* cap_type = Type::make_function_type(NULL, NULL, len_result,
146 cap_type->set_is_builtin();
147 this->globals_->add_function_declaration("cap", NULL, cap_type, loc);
149 Function_type* print_type = Type::make_function_type(NULL, NULL, NULL, loc);
150 print_type->set_is_varargs();
151 print_type->set_is_builtin();
152 this->globals_->add_function_declaration("print", NULL, print_type, loc);
154 print_type = Type::make_function_type(NULL, NULL, NULL, loc);
155 print_type->set_is_varargs();
156 print_type->set_is_builtin();
157 this->globals_->add_function_declaration("println", NULL, print_type, loc);
159 Type *empty = Type::make_interface_type(NULL, loc);
160 Typed_identifier_list* panic_parms = new Typed_identifier_list();
161 panic_parms->push_back(Typed_identifier("e", empty, loc));
162 Function_type *panic_type = Type::make_function_type(NULL, panic_parms,
164 panic_type->set_is_builtin();
165 this->globals_->add_function_declaration("panic", NULL, panic_type, loc);
167 Typed_identifier_list* recover_result = new Typed_identifier_list();
168 recover_result->push_back(Typed_identifier("", empty, loc));
169 Function_type* recover_type = Type::make_function_type(NULL, NULL,
172 recover_type->set_is_builtin();
173 this->globals_->add_function_declaration("recover", NULL, recover_type, loc);
175 Function_type* close_type = Type::make_function_type(NULL, NULL, NULL, loc);
176 close_type->set_is_varargs();
177 close_type->set_is_builtin();
178 this->globals_->add_function_declaration("close", NULL, close_type, loc);
180 Typed_identifier_list* closed_result = new Typed_identifier_list();
181 closed_result->push_back(Typed_identifier("", Type::lookup_bool_type(),
183 Function_type* closed_type = Type::make_function_type(NULL, NULL,
185 closed_type->set_is_varargs();
186 closed_type->set_is_builtin();
187 this->globals_->add_function_declaration("closed", NULL, closed_type, loc);
189 Typed_identifier_list* copy_result = new Typed_identifier_list();
190 copy_result->push_back(Typed_identifier("", int_type, loc));
191 Function_type* copy_type = Type::make_function_type(NULL, NULL,
193 copy_type->set_is_varargs();
194 copy_type->set_is_builtin();
195 this->globals_->add_function_declaration("copy", NULL, copy_type, loc);
197 Function_type* append_type = Type::make_function_type(NULL, NULL, NULL, loc);
198 append_type->set_is_varargs();
199 append_type->set_is_builtin();
200 this->globals_->add_function_declaration("append", NULL, append_type, loc);
202 Function_type* cmplx_type = Type::make_function_type(NULL, NULL, NULL, loc);
203 cmplx_type->set_is_varargs();
204 cmplx_type->set_is_builtin();
205 this->globals_->add_function_declaration("cmplx", NULL, cmplx_type, loc);
207 Function_type* real_type = Type::make_function_type(NULL, NULL, NULL, loc);
208 real_type->set_is_varargs();
209 real_type->set_is_builtin();
210 this->globals_->add_function_declaration("real", NULL, real_type, loc);
212 Function_type* imag_type = Type::make_function_type(NULL, NULL, NULL, loc);
213 imag_type->set_is_varargs();
214 imag_type->set_is_builtin();
215 this->globals_->add_function_declaration("imag", NULL, cmplx_type, loc);
217 this->define_builtin_function_trees();
219 // Declare "init", to ensure that it is not defined with parameters
221 this->declare_function("init",
222 Type::make_function_type(NULL, NULL, NULL, loc),
226 // Munge name for use in an error message.
229 Gogo::message_name(const std::string& name)
231 return go_localize_identifier(Gogo::unpack_hidden_name(name).c_str());
234 // Get the package name.
237 Gogo::package_name() const
239 gcc_assert(this->package_ != NULL);
240 return this->package_->name();
243 // Set the package name.
246 Gogo::set_package_name(const std::string& package_name,
247 source_location location)
249 if (this->package_ != NULL && this->package_->name() != package_name)
251 error_at(location, "expected package %<%s%>",
252 Gogo::message_name(this->package_->name()).c_str());
256 // If the user did not specify a unique prefix, we always use "go".
257 // This in effect requires that the package name be unique.
258 if (this->unique_prefix_.empty())
259 this->unique_prefix_ = "go";
261 this->package_ = this->register_package(package_name, this->unique_prefix_,
264 // We used to permit people to qualify symbols with the current
265 // package name (e.g., P.x), but we no longer do.
266 // this->globals_->add_package(package_name, this->package_);
268 if (package_name == "main")
270 // Declare "main" as a function which takes no parameters and
272 this->declare_function("main",
273 Type::make_function_type(NULL, NULL, NULL,
282 Gogo::import_package(const std::string& filename,
283 const std::string& local_name,
284 bool is_local_name_exported,
285 source_location location)
287 if (filename == "unsafe")
289 this->import_unsafe(local_name, is_local_name_exported, location);
293 Imports::const_iterator p = this->imports_.find(filename);
294 if (p != this->imports_.end())
296 Package* package = p->second;
297 package->set_location(location);
298 package->set_is_imported();
299 std::string ln = local_name;
300 bool is_ln_exported = is_local_name_exported;
303 ln = package->name();
304 is_ln_exported = Lex::is_exported_name(ln);
308 ln = this->pack_hidden_name(ln, is_ln_exported);
309 this->package_->bindings()->add_package(ln, package);
313 Bindings* bindings = package->bindings();
314 for (Bindings::const_declarations_iterator p =
315 bindings->begin_declarations();
316 p != bindings->end_declarations();
318 this->add_named_object(p->second);
323 Import::Stream* stream = Import::open_package(filename, location);
326 error_at(location, "import file %qs not found", filename.c_str());
330 Import imp(stream, location);
331 imp.register_builtin_types(this);
332 Package* package = imp.import(this, local_name, is_local_name_exported);
333 this->imports_.insert(std::make_pair(filename, package));
334 package->set_is_imported();
339 // Add an import control function for an imported package to the list.
342 Gogo::add_import_init_fn(const std::string& package_name,
343 const std::string& init_name, int prio)
345 for (std::set<Import_init>::const_iterator p =
346 this->imported_init_fns_.begin();
347 p != this->imported_init_fns_.end();
350 if (p->init_name() == init_name
351 && (p->package_name() != package_name || p->priority() != prio))
353 error("duplicate package initialization name %qs",
354 Gogo::message_name(init_name).c_str());
355 inform(UNKNOWN_LOCATION, "used by package %qs at priority %d",
356 Gogo::message_name(p->package_name()).c_str(),
358 inform(UNKNOWN_LOCATION, " and by package %qs at priority %d",
359 Gogo::message_name(package_name).c_str(), prio);
364 this->imported_init_fns_.insert(Import_init(package_name, init_name,
368 // Return whether we are at the global binding level.
371 Gogo::in_global_scope() const
373 return this->functions_.empty();
376 // Return the current binding contour.
379 Gogo::current_bindings()
381 if (!this->functions_.empty())
382 return this->functions_.back().blocks.back()->bindings();
383 else if (this->package_ != NULL)
384 return this->package_->bindings();
386 return this->globals_;
390 Gogo::current_bindings() const
392 if (!this->functions_.empty())
393 return this->functions_.back().blocks.back()->bindings();
394 else if (this->package_ != NULL)
395 return this->package_->bindings();
397 return this->globals_;
400 // Return the current block.
403 Gogo::current_block()
405 if (this->functions_.empty())
408 return this->functions_.back().blocks.back();
411 // Look up a name in the current binding contour. If PFUNCTION is not
412 // NULL, set it to the function in which the name is defined, or NULL
413 // if the name is defined in global scope.
416 Gogo::lookup(const std::string& name, Named_object** pfunction) const
418 if (Gogo::is_sink_name(name))
419 return Named_object::make_sink();
421 for (Open_functions::const_reverse_iterator p = this->functions_.rbegin();
422 p != this->functions_.rend();
425 Named_object* ret = p->blocks.back()->bindings()->lookup(name);
428 if (pfunction != NULL)
429 *pfunction = p->function;
434 if (pfunction != NULL)
437 if (this->package_ != NULL)
439 Named_object* ret = this->package_->bindings()->lookup(name);
442 if (ret->package() != NULL)
443 ret->package()->set_used();
448 // We do not look in the global namespace. If we did, the global
449 // namespace would effectively hide names which were defined in
450 // package scope which we have not yet seen. Instead,
451 // define_global_names is called after parsing is over to connect
452 // undefined names at package scope with names defined at global
458 // Look up a name in the current block, without searching enclosing
462 Gogo::lookup_in_block(const std::string& name) const
464 gcc_assert(!this->functions_.empty());
465 gcc_assert(!this->functions_.back().blocks.empty());
466 return this->functions_.back().blocks.back()->bindings()->lookup_local(name);
469 // Look up a name in the global namespace.
472 Gogo::lookup_global(const char* name) const
474 return this->globals_->lookup(name);
477 // Add an imported package.
480 Gogo::add_imported_package(const std::string& real_name,
481 const std::string& alias_arg,
482 bool is_alias_exported,
483 const std::string& unique_prefix,
484 source_location location,
485 bool* padd_to_globals)
487 // FIXME: Now that we compile packages as a whole, should we permit
488 // importing the current package?
489 if (this->package_name() == real_name
490 && this->unique_prefix() == unique_prefix)
492 *padd_to_globals = false;
493 if (!alias_arg.empty() && alias_arg != ".")
495 std::string alias = this->pack_hidden_name(alias_arg,
497 this->package_->bindings()->add_package(alias, this->package_);
499 return this->package_;
501 else if (alias_arg == ".")
503 *padd_to_globals = true;
504 return this->register_package(real_name, unique_prefix, location);
506 else if (alias_arg == "_")
508 Package* ret = this->register_package(real_name, unique_prefix, location);
509 ret->set_uses_sink_alias();
514 *padd_to_globals = false;
515 std::string alias = alias_arg;
519 is_alias_exported = Lex::is_exported_name(alias);
521 alias = this->pack_hidden_name(alias, is_alias_exported);
522 Named_object* no = this->add_package(real_name, alias, unique_prefix,
524 if (!no->is_package())
526 return no->package_value();
533 Gogo::add_package(const std::string& real_name, const std::string& alias,
534 const std::string& unique_prefix, source_location location)
536 gcc_assert(this->in_global_scope());
538 // Register the package. Note that we might have already seen it in
539 // an earlier import.
540 Package* package = this->register_package(real_name, unique_prefix, location);
542 return this->package_->bindings()->add_package(alias, package);
545 // Register a package. This package may or may not be imported. This
546 // returns the Package structure for the package, creating if it
550 Gogo::register_package(const std::string& package_name,
551 const std::string& unique_prefix,
552 source_location location)
554 gcc_assert(!unique_prefix.empty() && !package_name.empty());
555 std::string name = unique_prefix + '.' + package_name;
556 Package* package = NULL;
557 std::pair<Packages::iterator, bool> ins =
558 this->packages_.insert(std::make_pair(name, package));
561 // We have seen this package name before.
562 package = ins.first->second;
563 gcc_assert(package != NULL);
564 gcc_assert(package->name() == package_name
565 && package->unique_prefix() == unique_prefix);
566 if (package->location() == UNKNOWN_LOCATION)
567 package->set_location(location);
571 // First time we have seen this package name.
572 package = new Package(package_name, unique_prefix, location);
573 gcc_assert(ins.first->second == NULL);
574 ins.first->second = package;
580 // Start compiling a function.
583 Gogo::start_function(const std::string& name, Function_type* type,
584 bool add_method_to_type, source_location location)
586 bool at_top_level = this->functions_.empty();
588 Block* block = new Block(NULL, location);
590 Function* enclosing = (at_top_level
592 : this->functions_.back().function->func_value());
594 Function* function = new Function(type, enclosing, block, location);
596 if (type->is_method())
598 const Typed_identifier* receiver = type->receiver();
599 Variable* this_param = new Variable(receiver->type(), NULL, false,
600 true, true, location);
601 std::string name = receiver->name();
604 // We need to give receivers a name since they wind up in
605 // DECL_ARGUMENTS. FIXME.
606 static unsigned int count;
608 snprintf(buf, sizeof buf, "r.%u", count);
612 block->bindings()->add_variable(name, NULL, this_param);
615 const Typed_identifier_list* parameters = type->parameters();
616 bool is_varargs = type->is_varargs();
617 if (parameters != NULL)
619 for (Typed_identifier_list::const_iterator p = parameters->begin();
620 p != parameters->end();
623 Variable* param = new Variable(p->type(), NULL, false, true, false,
625 if (is_varargs && p + 1 == parameters->end())
626 param->set_is_varargs_parameter();
628 std::string name = p->name();
629 if (name.empty() || Gogo::is_sink_name(name))
631 // We need to give parameters a name since they wind up
632 // in DECL_ARGUMENTS. FIXME.
633 static unsigned int count;
635 snprintf(buf, sizeof buf, "p.%u", count);
639 block->bindings()->add_variable(name, NULL, param);
643 function->create_named_result_variables(this);
645 const std::string* pname;
646 std::string nested_name;
651 // Invent a name for a nested function.
652 static int nested_count;
654 snprintf(buf, sizeof buf, ".$nested%d", nested_count);
657 pname = &nested_name;
661 if (Gogo::is_sink_name(*pname))
662 ret = Named_object::make_sink();
663 else if (!type->is_method())
665 ret = this->package_->bindings()->add_function(*pname, NULL, function);
666 if (!ret->is_function())
668 // Redefinition error.
669 ret = Named_object::make_function(name, NULL, function);
674 if (!add_method_to_type)
675 ret = Named_object::make_function(name, NULL, function);
678 gcc_assert(at_top_level);
679 Type* rtype = type->receiver()->type();
681 // We want to look through the pointer created by the
682 // parser, without getting an error if the type is not yet
684 if (rtype->classification() == Type::TYPE_POINTER)
685 rtype = rtype->points_to();
687 if (rtype->is_error_type())
688 ret = Named_object::make_function(name, NULL, function);
689 else if (rtype->named_type() != NULL)
691 ret = rtype->named_type()->add_method(name, function);
692 if (!ret->is_function())
694 // Redefinition error.
695 ret = Named_object::make_function(name, NULL, function);
698 else if (rtype->forward_declaration_type() != NULL)
700 Named_object* type_no =
701 rtype->forward_declaration_type()->named_object();
702 if (type_no->is_unknown())
704 // If we are seeing methods it really must be a
705 // type. Declare it as such. An alternative would
706 // be to support lists of methods for unknown
707 // expressions. Either way the error messages if
708 // this is not a type are going to get confusing.
709 Named_object* declared =
710 this->declare_package_type(type_no->name(),
711 type_no->location());
713 == type_no->unknown_value()->real_named_object());
715 ret = rtype->forward_declaration_type()->add_method(name,
721 this->package_->bindings()->add_method(ret);
724 this->functions_.resize(this->functions_.size() + 1);
725 Open_function& of(this->functions_.back());
727 of.blocks.push_back(block);
729 if (!type->is_method() && Gogo::unpack_hidden_name(name) == "init")
731 this->init_functions_.push_back(ret);
732 this->need_init_fn_ = true;
738 // Finish compiling a function.
741 Gogo::finish_function(source_location location)
743 this->finish_block(location);
744 gcc_assert(this->functions_.back().blocks.empty());
745 this->functions_.pop_back();
748 // Return the current function.
751 Gogo::current_function() const
753 gcc_assert(!this->functions_.empty());
754 return this->functions_.back().function;
757 // Start a new block.
760 Gogo::start_block(source_location location)
762 gcc_assert(!this->functions_.empty());
763 Block* block = new Block(this->current_block(), location);
764 this->functions_.back().blocks.push_back(block);
770 Gogo::finish_block(source_location location)
772 gcc_assert(!this->functions_.empty());
773 gcc_assert(!this->functions_.back().blocks.empty());
774 Block* block = this->functions_.back().blocks.back();
775 this->functions_.back().blocks.pop_back();
776 block->set_end_location(location);
780 // Add an unknown name.
783 Gogo::add_unknown_name(const std::string& name, source_location location)
785 return this->package_->bindings()->add_unknown_name(name, location);
788 // Declare a function.
791 Gogo::declare_function(const std::string& name, Function_type* type,
792 source_location location)
794 if (!type->is_method())
795 return this->current_bindings()->add_function_declaration(name, NULL, type,
799 // We don't bother to add this to the list of global
801 Type* rtype = type->receiver()->type();
803 // We want to look through the pointer created by the
804 // parser, without getting an error if the type is not yet
806 if (rtype->classification() == Type::TYPE_POINTER)
807 rtype = rtype->points_to();
809 if (rtype->is_error_type())
811 else if (rtype->named_type() != NULL)
812 return rtype->named_type()->add_method_declaration(name, NULL, type,
814 else if (rtype->forward_declaration_type() != NULL)
816 Forward_declaration_type* ftype = rtype->forward_declaration_type();
817 return ftype->add_method_declaration(name, type, location);
824 // Add a label definition.
827 Gogo::add_label_definition(const std::string& label_name,
828 source_location location)
830 gcc_assert(!this->functions_.empty());
831 Function* func = this->functions_.back().function->func_value();
832 Label* label = func->add_label_definition(label_name, location);
833 this->add_statement(Statement::make_label_statement(label, location));
837 // Add a label reference.
840 Gogo::add_label_reference(const std::string& label_name)
842 gcc_assert(!this->functions_.empty());
843 Function* func = this->functions_.back().function->func_value();
844 return func->add_label_reference(label_name);
850 Gogo::add_statement(Statement* statement)
852 gcc_assert(!this->functions_.empty()
853 && !this->functions_.back().blocks.empty());
854 this->functions_.back().blocks.back()->add_statement(statement);
860 Gogo::add_block(Block* block, source_location location)
862 gcc_assert(!this->functions_.empty()
863 && !this->functions_.back().blocks.empty());
864 Statement* statement = Statement::make_block_statement(block, location);
865 this->functions_.back().blocks.back()->add_statement(statement);
871 Gogo::add_constant(const Typed_identifier& tid, Expression* expr,
874 return this->current_bindings()->add_constant(tid, NULL, expr, iota_value);
880 Gogo::add_type(const std::string& name, Type* type, source_location location)
882 Named_object* no = this->current_bindings()->add_type(name, NULL, type,
884 if (!this->in_global_scope())
885 no->type_value()->set_in_function(this->functions_.back().function);
891 Gogo::add_named_type(Named_type* type)
893 gcc_assert(this->in_global_scope());
894 this->current_bindings()->add_named_type(type);
900 Gogo::declare_type(const std::string& name, source_location location)
902 Bindings* bindings = this->current_bindings();
903 Named_object* no = bindings->add_type_declaration(name, NULL, location);
904 if (!this->in_global_scope())
906 Named_object* f = this->functions_.back().function;
907 no->type_declaration_value()->set_in_function(f);
912 // Declare a type at the package level.
915 Gogo::declare_package_type(const std::string& name, source_location location)
917 return this->package_->bindings()->add_type_declaration(name, NULL, location);
920 // Define a type which was already declared.
923 Gogo::define_type(Named_object* no, Named_type* type)
925 this->current_bindings()->define_type(no, type);
931 Gogo::add_variable(const std::string& name, Variable* variable)
933 Named_object* no = this->current_bindings()->add_variable(name, NULL,
936 // In a function the middle-end wants to see a DECL_EXPR node.
939 && !no->var_value()->is_parameter()
940 && !this->functions_.empty())
941 this->add_statement(Statement::make_variable_declaration(no));
946 // Add a sink--a reference to the blank identifier _.
951 return Named_object::make_sink();
954 // Add a named object.
957 Gogo::add_named_object(Named_object* no)
959 this->current_bindings()->add_named_object(no);
962 // Record that we've seen an interface type.
965 Gogo::record_interface_type(Interface_type* itype)
967 this->interface_types_.push_back(itype);
970 // Return a name for a thunk object.
975 static int thunk_count;
977 snprintf(thunk_name, sizeof thunk_name, "$thunk%d", thunk_count);
982 // Return whether a function is a thunk.
985 Gogo::is_thunk(const Named_object* no)
987 return no->name().compare(0, 6, "$thunk") == 0;
990 // Define the global names. We do this only after parsing all the
991 // input files, because the program might define the global names
995 Gogo::define_global_names()
997 for (Bindings::const_declarations_iterator p =
998 this->globals_->begin_declarations();
999 p != this->globals_->end_declarations();
1002 Named_object* global_no = p->second;
1003 std::string name(Gogo::pack_hidden_name(global_no->name(), false));
1004 Named_object* no = this->package_->bindings()->lookup(name);
1008 if (no->is_type_declaration())
1010 if (global_no->is_type())
1012 if (no->type_declaration_value()->has_methods())
1013 error_at(no->location(),
1014 "may not define methods for global type");
1015 no->set_type_value(global_no->type_value());
1019 error_at(no->location(), "expected type");
1020 Type* errtype = Type::make_error_type();
1021 Named_object* err = Named_object::make_type("error", NULL,
1024 no->set_type_value(err->type_value());
1027 else if (no->is_unknown())
1028 no->unknown_value()->set_real_named_object(global_no);
1032 // Clear out names in file scope.
1035 Gogo::clear_file_scope()
1037 this->package_->bindings()->clear_file_scope();
1039 // Warn about packages which were imported but not used.
1040 for (Packages::iterator p = this->packages_.begin();
1041 p != this->packages_.end();
1044 Package* package = p->second;
1045 if (package != this->package_
1046 && package->is_imported()
1048 && !package->uses_sink_alias()
1050 error_at(package->location(), "imported and not used: %s",
1051 Gogo::message_name(package->name()).c_str());
1052 package->clear_is_imported();
1053 package->clear_uses_sink_alias();
1054 package->clear_used();
1058 // Traverse the tree.
1061 Gogo::traverse(Traverse* traverse)
1063 // Traverse the current package first for consistency. The other
1064 // packages will only contain imported types, constants, and
1066 if (this->package_->bindings()->traverse(traverse, true) == TRAVERSE_EXIT)
1068 for (Packages::const_iterator p = this->packages_.begin();
1069 p != this->packages_.end();
1072 if (p->second != this->package_)
1074 if (p->second->bindings()->traverse(traverse, true) == TRAVERSE_EXIT)
1080 // Traversal class used to verify types.
1082 class Verify_types : public Traverse
1086 : Traverse(traverse_types)
1093 // Verify that a type is correct.
1096 Verify_types::type(Type* t)
1098 // Don't verify types defined in other packages.
1099 Named_type* nt = t->named_type();
1100 if (nt != NULL && nt->named_object()->package() != NULL)
1101 return TRAVERSE_SKIP_COMPONENTS;
1104 return TRAVERSE_SKIP_COMPONENTS;
1105 return TRAVERSE_CONTINUE;
1108 // Verify that all types are correct.
1111 Gogo::verify_types()
1113 Verify_types traverse;
1114 this->traverse(&traverse);
1117 // Traversal class used to lower parse tree.
1119 class Lower_parse_tree : public Traverse
1122 Lower_parse_tree(Gogo* gogo, Named_object* function)
1123 : Traverse(traverse_constants
1124 | traverse_functions
1125 | traverse_statements
1126 | traverse_expressions),
1127 gogo_(gogo), function_(function), iota_value_(-1)
1131 constant(Named_object*, bool);
1134 function(Named_object*);
1137 statement(Block*, size_t* pindex, Statement*);
1140 expression(Expression**);
1145 // The function we are traversing.
1146 Named_object* function_;
1147 // Value to use for the predeclared constant iota.
1151 // Lower constants. We handle constants specially so that we can set
1152 // the right value for the predeclared constant iota. This works in
1153 // conjunction with the way we lower Const_expression objects.
1156 Lower_parse_tree::constant(Named_object* no, bool)
1158 Named_constant* nc = no->const_value();
1160 // We can recursively a constant if the initializer expression
1161 // manages to refer to itself.
1163 return TRAVERSE_CONTINUE;
1166 gcc_assert(this->iota_value_ == -1);
1167 this->iota_value_ = nc->iota_value();
1168 nc->traverse_expression(this);
1169 this->iota_value_ = -1;
1171 nc->clear_lowering();
1173 // We will traverse the expression a second time, but that will be
1176 return TRAVERSE_CONTINUE;
1179 // Lower function closure types. Record the function while lowering
1180 // it, so that we can pass it down when lowering an expression.
1183 Lower_parse_tree::function(Named_object* no)
1185 no->func_value()->set_closure_type();
1187 gcc_assert(this->function_ == NULL);
1188 this->function_ = no;
1189 int t = no->func_value()->traverse(this);
1190 this->function_ = NULL;
1192 if (t == TRAVERSE_EXIT)
1194 return TRAVERSE_SKIP_COMPONENTS;
1197 // Lower statement parse trees.
1200 Lower_parse_tree::statement(Block* block, size_t* pindex, Statement* sorig)
1202 // Lower the expressions first.
1203 int t = sorig->traverse_contents(this);
1204 if (t == TRAVERSE_EXIT)
1207 // Keep lowering until nothing changes.
1208 Statement* s = sorig;
1211 Statement* snew = s->lower(this->gogo_, block);
1215 t = s->traverse_contents(this);
1216 if (t == TRAVERSE_EXIT)
1221 block->replace_statement(*pindex, s);
1223 return TRAVERSE_SKIP_COMPONENTS;
1226 // Lower expression parse trees.
1229 Lower_parse_tree::expression(Expression** pexpr)
1231 // We have to lower all subexpressions first, so that we can get
1232 // their type if necessary. This is awkward, because we don't have
1233 // a postorder traversal pass.
1234 if ((*pexpr)->traverse_subexpressions(this) == TRAVERSE_EXIT)
1235 return TRAVERSE_EXIT;
1236 // Keep lowering until nothing changes.
1239 Expression* e = *pexpr;
1240 Expression* enew = e->lower(this->gogo_, this->function_,
1246 return TRAVERSE_SKIP_COMPONENTS;
1249 // Lower the parse tree. This is called after the parse is complete,
1250 // when all names should be resolved.
1253 Gogo::lower_parse_tree()
1255 Lower_parse_tree lower_parse_tree(this, NULL);
1256 this->traverse(&lower_parse_tree);
1259 // Lower an expression.
1262 Gogo::lower_expression(Named_object* function, Expression** pexpr)
1264 Lower_parse_tree lower_parse_tree(this, function);
1265 lower_parse_tree.expression(pexpr);
1268 // Lower a constant. This is called when lowering a reference to a
1269 // constant. We have to make sure that the constant has already been
1273 Gogo::lower_constant(Named_object* no)
1275 gcc_assert(no->is_const());
1276 Lower_parse_tree lower(this, NULL);
1277 lower.constant(no, false);
1280 // Look for interface types to finalize methods of inherited
1283 class Finalize_methods : public Traverse
1286 Finalize_methods(Gogo* gogo)
1287 : Traverse(traverse_types),
1298 // Finalize the methods of an interface type.
1301 Finalize_methods::type(Type* t)
1303 // Check the classification so that we don't finalize the methods
1304 // twice for a named interface type.
1305 switch (t->classification())
1307 case Type::TYPE_INTERFACE:
1308 t->interface_type()->finalize_methods();
1311 case Type::TYPE_NAMED:
1313 // We have to finalize the methods of the real type first.
1314 // But if the real type is a struct type, then we only want to
1315 // finalize the methods of the field types, not of the struct
1316 // type itself. We don't want to add methods to the struct,
1317 // since it has a name.
1318 Type* rt = t->named_type()->real_type();
1319 if (rt->classification() != Type::TYPE_STRUCT)
1321 if (Type::traverse(rt, this) == TRAVERSE_EXIT)
1322 return TRAVERSE_EXIT;
1326 if (rt->struct_type()->traverse_field_types(this) == TRAVERSE_EXIT)
1327 return TRAVERSE_EXIT;
1330 t->named_type()->finalize_methods(this->gogo_);
1332 return TRAVERSE_SKIP_COMPONENTS;
1335 case Type::TYPE_STRUCT:
1336 t->struct_type()->finalize_methods(this->gogo_);
1343 return TRAVERSE_CONTINUE;
1346 // Finalize method lists and build stub methods for types.
1349 Gogo::finalize_methods()
1351 Finalize_methods finalize(this);
1352 this->traverse(&finalize);
1355 // Set types for unspecified variables and constants.
1358 Gogo::determine_types()
1360 Bindings* bindings = this->current_bindings();
1361 for (Bindings::const_definitions_iterator p = bindings->begin_definitions();
1362 p != bindings->end_definitions();
1365 if ((*p)->is_function())
1366 (*p)->func_value()->determine_types();
1367 else if ((*p)->is_variable())
1368 (*p)->var_value()->determine_type();
1369 else if ((*p)->is_const())
1370 (*p)->const_value()->determine_type();
1372 // See if a variable requires us to build an initialization
1373 // function. We know that we will see all global variables
1375 if (!this->need_init_fn_ && (*p)->is_variable())
1377 Variable* variable = (*p)->var_value();
1379 // If this is a global variable which requires runtime
1380 // initialization, we need an initialization function.
1381 if (!variable->is_global() || variable->init() == NULL)
1383 else if (variable->type()->interface_type() != NULL)
1384 this->need_init_fn_ = true;
1385 else if (variable->init()->is_constant())
1387 else if (!variable->init()->is_composite_literal())
1388 this->need_init_fn_ = true;
1389 else if (variable->init()->is_nonconstant_composite_literal())
1390 this->need_init_fn_ = true;
1392 // If this is a global variable which holds a pointer value,
1393 // then we need an initialization function to register it as a
1395 if (variable->is_global() && variable->type()->has_pointer())
1396 this->need_init_fn_ = true;
1400 // Determine the types of constants in packages.
1401 for (Packages::const_iterator p = this->packages_.begin();
1402 p != this->packages_.end();
1404 p->second->determine_types();
1407 // Traversal class used for type checking.
1409 class Check_types_traverse : public Traverse
1412 Check_types_traverse(Gogo* gogo)
1413 : Traverse(traverse_variables
1414 | traverse_constants
1415 | traverse_statements
1416 | traverse_expressions),
1421 variable(Named_object*);
1424 constant(Named_object*, bool);
1427 statement(Block*, size_t* pindex, Statement*);
1430 expression(Expression**);
1437 // Check that a variable initializer has the right type.
1440 Check_types_traverse::variable(Named_object* named_object)
1442 if (named_object->is_variable())
1444 Variable* var = named_object->var_value();
1445 Expression* init = var->init();
1448 && !Type::are_assignable(var->type(), init->type(), &reason))
1451 error_at(var->location(), "incompatible type in initialization");
1453 error_at(var->location(),
1454 "incompatible type in initialization (%s)",
1459 return TRAVERSE_CONTINUE;
1462 // Check that a constant initializer has the right type.
1465 Check_types_traverse::constant(Named_object* named_object, bool)
1467 Named_constant* constant = named_object->const_value();
1468 Type* ctype = constant->type();
1469 if (ctype->integer_type() == NULL
1470 && ctype->float_type() == NULL
1471 && ctype->complex_type() == NULL
1472 && !ctype->is_boolean_type()
1473 && !ctype->is_string_type())
1475 if (!ctype->is_error_type())
1476 error_at(constant->location(), "invalid constant type");
1477 constant->set_error();
1479 else if (!constant->expr()->is_constant())
1481 error_at(constant->expr()->location(), "expression is not constant");
1482 constant->set_error();
1484 else if (!Type::are_assignable(constant->type(), constant->expr()->type(),
1487 error_at(constant->location(),
1488 "initialization expression has wrong type");
1489 constant->set_error();
1491 return TRAVERSE_CONTINUE;
1494 // Check that types are valid in a statement.
1497 Check_types_traverse::statement(Block*, size_t*, Statement* s)
1499 s->check_types(this->gogo_);
1500 return TRAVERSE_CONTINUE;
1503 // Check that types are valid in an expression.
1506 Check_types_traverse::expression(Expression** expr)
1508 (*expr)->check_types(this->gogo_);
1509 return TRAVERSE_CONTINUE;
1512 // Check that types are valid.
1517 Check_types_traverse traverse(this);
1518 this->traverse(&traverse);
1521 // Check the types in a single block.
1524 Gogo::check_types_in_block(Block* block)
1526 Check_types_traverse traverse(this);
1527 block->traverse(&traverse);
1530 // A traversal class used to find a single shortcut operator within an
1533 class Find_shortcut : public Traverse
1537 : Traverse(traverse_blocks
1538 | traverse_statements
1539 | traverse_expressions),
1543 // A pointer to the expression which was found, or NULL if none was
1547 { return this->found_; }
1552 { return TRAVERSE_SKIP_COMPONENTS; }
1555 statement(Block*, size_t*, Statement*)
1556 { return TRAVERSE_SKIP_COMPONENTS; }
1559 expression(Expression**);
1562 Expression** found_;
1565 // Find a shortcut expression.
1568 Find_shortcut::expression(Expression** pexpr)
1570 Expression* expr = *pexpr;
1571 Binary_expression* be = expr->binary_expression();
1573 return TRAVERSE_CONTINUE;
1574 Operator op = be->op();
1575 if (op != OPERATOR_OROR && op != OPERATOR_ANDAND)
1576 return TRAVERSE_CONTINUE;
1577 gcc_assert(this->found_ == NULL);
1578 this->found_ = pexpr;
1579 return TRAVERSE_EXIT;
1582 // A traversal class used to turn shortcut operators into explicit if
1585 class Shortcuts : public Traverse
1589 : Traverse(traverse_variables
1590 | traverse_statements)
1595 variable(Named_object*);
1598 statement(Block*, size_t*, Statement*);
1601 // Convert a shortcut operator.
1603 convert_shortcut(Block* enclosing, Expression** pshortcut);
1606 // Remove shortcut operators in a single statement.
1609 Shortcuts::statement(Block* block, size_t* pindex, Statement* s)
1611 // FIXME: This approach doesn't work for switch statements, because
1612 // we add the new statements before the whole switch when we need to
1613 // instead add them just before the switch expression. The right
1614 // fix is probably to lower switch statements with nonconstant cases
1615 // to a series of conditionals.
1616 if (s->switch_statement() != NULL)
1617 return TRAVERSE_CONTINUE;
1621 Find_shortcut find_shortcut;
1623 // If S is a variable declaration, then ordinary traversal won't
1624 // do anything. We want to explicitly traverse the
1625 // initialization expression if there is one.
1626 Variable_declaration_statement* vds = s->variable_declaration_statement();
1627 Expression* init = NULL;
1629 s->traverse_contents(&find_shortcut);
1632 init = vds->var()->var_value()->init();
1634 return TRAVERSE_CONTINUE;
1635 init->traverse(&init, &find_shortcut);
1637 Expression** pshortcut = find_shortcut.found();
1638 if (pshortcut == NULL)
1639 return TRAVERSE_CONTINUE;
1641 Statement* snew = this->convert_shortcut(block, pshortcut);
1642 block->insert_statement_before(*pindex, snew);
1645 if (pshortcut == &init)
1646 vds->var()->var_value()->set_init(init);
1650 // Remove shortcut operators in the initializer of a global variable.
1653 Shortcuts::variable(Named_object* no)
1655 if (no->is_result_variable())
1656 return TRAVERSE_CONTINUE;
1657 Variable* var = no->var_value();
1658 Expression* init = var->init();
1659 if (!var->is_global() || init == NULL)
1660 return TRAVERSE_CONTINUE;
1664 Find_shortcut find_shortcut;
1665 init->traverse(&init, &find_shortcut);
1666 Expression** pshortcut = find_shortcut.found();
1667 if (pshortcut == NULL)
1668 return TRAVERSE_CONTINUE;
1670 Statement* snew = this->convert_shortcut(NULL, pshortcut);
1671 var->add_preinit_statement(snew);
1672 if (pshortcut == &init)
1673 var->set_init(init);
1677 // Given an expression which uses a shortcut operator, return a
1678 // statement which implements it, and update *PSHORTCUT accordingly.
1681 Shortcuts::convert_shortcut(Block* enclosing, Expression** pshortcut)
1683 Binary_expression* shortcut = (*pshortcut)->binary_expression();
1684 Expression* left = shortcut->left();
1685 Expression* right = shortcut->right();
1686 source_location loc = shortcut->location();
1688 Block* retblock = new Block(enclosing, loc);
1689 retblock->set_end_location(loc);
1691 Temporary_statement* ts = Statement::make_temporary(Type::make_boolean_type(),
1693 retblock->add_statement(ts);
1695 Block* block = new Block(retblock, loc);
1696 block->set_end_location(loc);
1697 Expression* tmpref = Expression::make_temporary_reference(ts, loc);
1698 Statement* assign = Statement::make_assignment(tmpref, right, loc);
1699 block->add_statement(assign);
1701 Expression* cond = Expression::make_temporary_reference(ts, loc);
1702 if (shortcut->binary_expression()->op() == OPERATOR_OROR)
1703 cond = Expression::make_unary(OPERATOR_NOT, cond, loc);
1705 Statement* if_statement = Statement::make_if_statement(cond, block, NULL,
1707 retblock->add_statement(if_statement);
1709 *pshortcut = Expression::make_temporary_reference(ts, loc);
1713 // Now convert any shortcut operators in LEFT and RIGHT.
1714 Shortcuts shortcuts;
1715 retblock->traverse(&shortcuts);
1717 return Statement::make_block_statement(retblock, loc);
1720 // Turn shortcut operators into explicit if statements. Doing this
1721 // considerably simplifies the order of evaluation rules.
1724 Gogo::remove_shortcuts()
1726 Shortcuts shortcuts;
1727 this->traverse(&shortcuts);
1730 // A traversal class which finds all the expressions which must be
1731 // evaluated in order within a statement or larger expression. This
1732 // is used to implement the rules about order of evaluation.
1734 class Find_eval_ordering : public Traverse
1737 typedef std::vector<Expression**> Expression_pointers;
1740 Find_eval_ordering()
1741 : Traverse(traverse_blocks
1742 | traverse_statements
1743 | traverse_expressions),
1749 { return this->exprs_.size(); }
1751 typedef Expression_pointers::const_iterator const_iterator;
1755 { return this->exprs_.begin(); }
1759 { return this->exprs_.end(); }
1764 { return TRAVERSE_SKIP_COMPONENTS; }
1767 statement(Block*, size_t*, Statement*)
1768 { return TRAVERSE_SKIP_COMPONENTS; }
1771 expression(Expression**);
1774 // A list of pointers to expressions with side-effects.
1775 Expression_pointers exprs_;
1778 // If an expression must be evaluated in order, put it on the list.
1781 Find_eval_ordering::expression(Expression** expression_pointer)
1783 // We have to look at subexpressions before this one.
1784 if ((*expression_pointer)->traverse_subexpressions(this) == TRAVERSE_EXIT)
1785 return TRAVERSE_EXIT;
1786 if ((*expression_pointer)->must_eval_in_order())
1787 this->exprs_.push_back(expression_pointer);
1788 return TRAVERSE_SKIP_COMPONENTS;
1791 // A traversal class for ordering evaluations.
1793 class Order_eval : public Traverse
1797 : Traverse(traverse_variables
1798 | traverse_statements)
1802 variable(Named_object*);
1805 statement(Block*, size_t*, Statement*);
1808 // Implement the order of evaluation rules for a statement.
1811 Order_eval::statement(Block* block, size_t* pindex, Statement* s)
1813 // FIXME: This approach doesn't work for switch statements, because
1814 // we add the new statements before the whole switch when we need to
1815 // instead add them just before the switch expression. The right
1816 // fix is probably to lower switch statements with nonconstant cases
1817 // to a series of conditionals.
1818 if (s->switch_statement() != NULL)
1819 return TRAVERSE_CONTINUE;
1821 Find_eval_ordering find_eval_ordering;
1823 // If S is a variable declaration, then ordinary traversal won't do
1824 // anything. We want to explicitly traverse the initialization
1825 // expression if there is one.
1826 Variable_declaration_statement* vds = s->variable_declaration_statement();
1827 Expression* init = NULL;
1828 Expression* orig_init = NULL;
1830 s->traverse_contents(&find_eval_ordering);
1833 init = vds->var()->var_value()->init();
1835 return TRAVERSE_CONTINUE;
1838 // It might seem that this could be
1839 // init->traverse_subexpressions. Unfortunately that can fail
1842 // newvar, err := call(arg())
1843 // Here newvar will have an init of call result 0 of
1844 // call(arg()). If we only traverse subexpressions, we will
1845 // only find arg(), and we won't bother to move anything out.
1846 // Then we get to the assignment to err, we will traverse the
1847 // whole statement, and this time we will find both call() and
1848 // arg(), and so we will move them out. This will cause them to
1849 // be put into temporary variables before the assignment to err
1850 // but after the declaration of newvar. To avoid that problem,
1851 // we traverse the entire expression here.
1852 Expression::traverse(&init, &find_eval_ordering);
1855 if (find_eval_ordering.size() <= 1)
1857 // If there is only one expression with a side-effect, we can
1858 // leave it in place.
1859 return TRAVERSE_CONTINUE;
1862 bool is_thunk = s->thunk_statement() != NULL;
1863 for (Find_eval_ordering::const_iterator p = find_eval_ordering.begin();
1864 p != find_eval_ordering.end();
1867 Expression** pexpr = *p;
1869 // If the last expression is a send or receive expression, we
1870 // may be ignoring the value; we don't want to evaluate it
1872 if (p + 1 == find_eval_ordering.end()
1873 && ((*pexpr)->classification() == Expression::EXPRESSION_SEND
1874 || (*pexpr)->classification() == Expression::EXPRESSION_RECEIVE))
1877 // The last expression in a thunk will be the call passed to go
1878 // or defer, which we must not evaluate early.
1879 if (is_thunk && p + 1 == find_eval_ordering.end())
1882 source_location loc = (*pexpr)->location();
1883 Temporary_statement* ts = Statement::make_temporary(NULL, *pexpr, loc);
1884 block->insert_statement_before(*pindex, ts);
1887 *pexpr = Expression::make_temporary_reference(ts, loc);
1890 if (init != orig_init)
1891 vds->var()->var_value()->set_init(init);
1893 return TRAVERSE_CONTINUE;
1896 // Implement the order of evaluation rules for the initializer of a
1900 Order_eval::variable(Named_object* no)
1902 if (no->is_result_variable())
1903 return TRAVERSE_CONTINUE;
1904 Variable* var = no->var_value();
1905 Expression* init = var->init();
1906 if (!var->is_global() || init == NULL)
1907 return TRAVERSE_CONTINUE;
1909 Find_eval_ordering find_eval_ordering;
1910 init->traverse_subexpressions(&find_eval_ordering);
1912 if (find_eval_ordering.size() <= 1)
1914 // If there is only one expression with a side-effect, we can
1915 // leave it in place.
1916 return TRAVERSE_SKIP_COMPONENTS;
1919 for (Find_eval_ordering::const_iterator p = find_eval_ordering.begin();
1920 p != find_eval_ordering.end();
1923 Expression** pexpr = *p;
1924 source_location loc = (*pexpr)->location();
1925 Temporary_statement* ts = Statement::make_temporary(NULL, *pexpr, loc);
1926 var->add_preinit_statement(ts);
1927 *pexpr = Expression::make_temporary_reference(ts, loc);
1930 return TRAVERSE_SKIP_COMPONENTS;
1933 // Use temporary variables to implement the order of evaluation rules.
1936 Gogo::order_evaluations()
1938 Order_eval order_eval;
1939 this->traverse(&order_eval);
1942 // Traversal to convert calls to the predeclared recover function to
1943 // pass in an argument indicating whether it can recover from a panic
1946 class Convert_recover : public Traverse
1949 Convert_recover(Named_object* arg)
1950 : Traverse(traverse_expressions),
1956 expression(Expression**);
1959 // The argument to pass to the function.
1963 // Convert calls to recover.
1966 Convert_recover::expression(Expression** pp)
1968 Call_expression* ce = (*pp)->call_expression();
1969 if (ce != NULL && ce->is_recover_call())
1970 ce->set_recover_arg(Expression::make_var_reference(this->arg_,
1972 return TRAVERSE_CONTINUE;
1975 // Traversal for build_recover_thunks.
1977 class Build_recover_thunks : public Traverse
1980 Build_recover_thunks(Gogo* gogo)
1981 : Traverse(traverse_functions),
1986 function(Named_object*);
1990 can_recover_arg(source_location);
1996 // If this function calls recover, turn it into a thunk.
1999 Build_recover_thunks::function(Named_object* orig_no)
2001 Function* orig_func = orig_no->func_value();
2002 if (!orig_func->calls_recover()
2003 || orig_func->is_recover_thunk()
2004 || orig_func->has_recover_thunk())
2005 return TRAVERSE_CONTINUE;
2007 Gogo* gogo = this->gogo_;
2008 source_location location = orig_func->location();
2013 Function_type* orig_fntype = orig_func->type();
2014 Typed_identifier_list* new_params = new Typed_identifier_list();
2015 std::string receiver_name;
2016 if (orig_fntype->is_method())
2018 const Typed_identifier* receiver = orig_fntype->receiver();
2019 snprintf(buf, sizeof buf, "rt.%u", count);
2021 receiver_name = buf;
2022 new_params->push_back(Typed_identifier(receiver_name, receiver->type(),
2023 receiver->location()));
2025 const Typed_identifier_list* orig_params = orig_fntype->parameters();
2026 if (orig_params != NULL && !orig_params->empty())
2028 for (Typed_identifier_list::const_iterator p = orig_params->begin();
2029 p != orig_params->end();
2032 snprintf(buf, sizeof buf, "pt.%u", count);
2034 new_params->push_back(Typed_identifier(buf, p->type(),
2038 snprintf(buf, sizeof buf, "pr.%u", count);
2040 std::string can_recover_name = buf;
2041 new_params->push_back(Typed_identifier(can_recover_name,
2042 Type::make_boolean_type(),
2043 orig_fntype->location()));
2045 const Typed_identifier_list* orig_results = orig_fntype->results();
2046 Typed_identifier_list* new_results;
2047 if (orig_results == NULL || orig_results->empty())
2051 new_results = new Typed_identifier_list();
2052 for (Typed_identifier_list::const_iterator p = orig_results->begin();
2053 p != orig_results->end();
2055 new_results->push_back(*p);
2058 Function_type *new_fntype = Type::make_function_type(NULL, new_params,
2060 orig_fntype->location());
2061 if (orig_fntype->is_varargs())
2062 new_fntype->set_is_varargs();
2064 std::string name = orig_no->name() + "$recover";
2065 Named_object *new_no = gogo->start_function(name, new_fntype, false,
2067 Function *new_func = new_no->func_value();
2068 if (orig_func->enclosing() != NULL)
2069 new_func->set_enclosing(orig_func->enclosing());
2071 // We build the code for the original function attached to the new
2072 // function, and then swap the original and new function bodies.
2073 // This means that existing references to the original function will
2074 // then refer to the new function. That makes this code a little
2075 // confusing, in that the reference to NEW_NO really refers to the
2076 // other function, not the one we are building.
2078 Expression* closure = NULL;
2079 if (orig_func->needs_closure())
2081 Named_object* orig_closure_no = orig_func->closure_var();
2082 Variable* orig_closure_var = orig_closure_no->var_value();
2083 Variable* new_var = new Variable(orig_closure_var->type(), NULL, false,
2084 true, false, location);
2085 snprintf(buf, sizeof buf, "closure.%u", count);
2087 Named_object* new_closure_no = Named_object::make_variable(buf, NULL,
2089 new_func->set_closure_var(new_closure_no);
2090 closure = Expression::make_var_reference(new_closure_no, location);
2093 Expression* fn = Expression::make_func_reference(new_no, closure, location);
2095 Expression_list* args = new Expression_list();
2096 if (orig_fntype->is_method())
2098 Named_object* rec_no = gogo->lookup(receiver_name, NULL);
2099 gcc_assert(rec_no != NULL
2100 && rec_no->is_variable()
2101 && rec_no->var_value()->is_parameter());
2102 args->push_back(Expression::make_var_reference(rec_no, location));
2104 if (new_params != NULL)
2106 // Note that we skip the last parameter, which is the boolean
2107 // indicating whether recover can succed.
2108 for (Typed_identifier_list::const_iterator p = new_params->begin();
2109 p + 1 != new_params->end();
2112 Named_object* p_no = gogo->lookup(p->name(), NULL);
2113 gcc_assert(p_no != NULL
2114 && p_no->is_variable()
2115 && p_no->var_value()->is_parameter());
2116 args->push_back(Expression::make_var_reference(p_no, location));
2119 args->push_back(this->can_recover_arg(location));
2121 Expression* call = Expression::make_call(fn, args, false, location);
2124 if (orig_fntype->results() == NULL || orig_fntype->results()->empty())
2125 s = Statement::make_statement(call);
2128 Expression_list* vals = new Expression_list();
2129 vals->push_back(call);
2130 s = Statement::make_return_statement(new_func->type()->results(),
2133 s->determine_types();
2134 gogo->add_statement(s);
2136 gogo->finish_function(location);
2138 // Swap the function bodies and types.
2139 new_func->swap_for_recover(orig_func);
2140 orig_func->set_is_recover_thunk();
2141 new_func->set_calls_recover();
2142 new_func->set_has_recover_thunk();
2144 Bindings* orig_bindings = orig_func->block()->bindings();
2145 Bindings* new_bindings = new_func->block()->bindings();
2146 if (orig_fntype->is_method())
2148 // We changed the receiver to be a regular parameter. We have
2149 // to update the binding accordingly in both functions.
2150 Named_object* orig_rec_no = orig_bindings->lookup_local(receiver_name);
2151 gcc_assert(orig_rec_no != NULL
2152 && orig_rec_no->is_variable()
2153 && !orig_rec_no->var_value()->is_receiver());
2154 orig_rec_no->var_value()->set_is_receiver();
2156 Named_object* new_rec_no = new_bindings->lookup_local(receiver_name);
2157 gcc_assert(new_rec_no != NULL
2158 && new_rec_no->is_variable()
2159 && !new_rec_no->var_value()->is_receiver());
2160 new_rec_no->var_value()->set_is_not_receiver();
2163 // Because we flipped blocks but not types, the can_recover
2164 // parameter appears in the (now) old bindings as a parameter.
2165 // Change it to a local variable, whereupon it will be discarded.
2166 Named_object* can_recover_no = orig_bindings->lookup_local(can_recover_name);
2167 gcc_assert(can_recover_no != NULL
2168 && can_recover_no->is_variable()
2169 && can_recover_no->var_value()->is_parameter());
2170 orig_bindings->remove_binding(can_recover_no);
2172 // Add the can_recover argument to the (now) new bindings, and
2173 // attach it to any recover statements.
2174 Variable* can_recover_var = new Variable(Type::make_boolean_type(), NULL,
2175 false, true, false, location);
2176 can_recover_no = new_bindings->add_variable(can_recover_name, NULL,
2178 Convert_recover convert_recover(can_recover_no);
2179 new_func->traverse(&convert_recover);
2181 return TRAVERSE_CONTINUE;
2184 // Return the expression to pass for the .can_recover parameter to the
2185 // new function. This indicates whether a call to recover may return
2186 // non-nil. The expression is
2187 // __go_can_recover(__builtin_return_address()).
2190 Build_recover_thunks::can_recover_arg(source_location location)
2192 static Named_object* builtin_return_address;
2193 if (builtin_return_address == NULL)
2195 const source_location bloc = BUILTINS_LOCATION;
2197 Typed_identifier_list* param_types = new Typed_identifier_list();
2198 Type* uint_type = Type::lookup_integer_type("uint");
2199 param_types->push_back(Typed_identifier("l", uint_type, bloc));
2201 Typed_identifier_list* return_types = new Typed_identifier_list();
2202 Type* voidptr_type = Type::make_pointer_type(Type::make_void_type());
2203 return_types->push_back(Typed_identifier("", voidptr_type, bloc));
2205 Function_type* fntype = Type::make_function_type(NULL, param_types,
2206 return_types, bloc);
2207 builtin_return_address =
2208 Named_object::make_function_declaration("__builtin_return_address",
2209 NULL, fntype, bloc);
2210 const char* n = "__builtin_return_address";
2211 builtin_return_address->func_declaration_value()->set_asm_name(n);
2214 static Named_object* can_recover;
2215 if (can_recover == NULL)
2217 const source_location bloc = BUILTINS_LOCATION;
2218 Typed_identifier_list* param_types = new Typed_identifier_list();
2219 Type* voidptr_type = Type::make_pointer_type(Type::make_void_type());
2220 param_types->push_back(Typed_identifier("a", voidptr_type, bloc));
2221 Type* boolean_type = Type::make_boolean_type();
2222 Typed_identifier_list* results = new Typed_identifier_list();
2223 results->push_back(Typed_identifier("", boolean_type, bloc));
2224 Function_type* fntype = Type::make_function_type(NULL, param_types,
2226 can_recover = Named_object::make_function_declaration("__go_can_recover",
2229 can_recover->func_declaration_value()->set_asm_name("__go_can_recover");
2232 Expression* fn = Expression::make_func_reference(builtin_return_address,
2236 mpz_init_set_ui(zval, 0UL);
2237 Expression* zexpr = Expression::make_integer(&zval, NULL, location);
2239 Expression_list *args = new Expression_list();
2240 args->push_back(zexpr);
2242 Expression* call = Expression::make_call(fn, args, false, location);
2244 args = new Expression_list();
2245 args->push_back(call);
2247 fn = Expression::make_func_reference(can_recover, NULL, location);
2248 return Expression::make_call(fn, args, false, location);
2251 // Build thunks for functions which call recover. We build a new
2252 // function with an extra parameter, which is whether a call to
2253 // recover can succeed. We then move the body of this function to
2254 // that one. We then turn this function into a thunk which calls the
2255 // new one, passing the value of
2256 // __go_can_recover(__builtin_return_address()). The function will be
2257 // marked as not splitting the stack. This will cooperate with the
2258 // implementation of defer to make recover do the right thing.
2261 Gogo::build_recover_thunks()
2263 Build_recover_thunks build_recover_thunks(this);
2264 this->traverse(&build_recover_thunks);
2267 // Look for named types to see whether we need to create an interface
2270 class Build_method_tables : public Traverse
2273 Build_method_tables(Gogo* gogo,
2274 const std::vector<Interface_type*>& interfaces)
2275 : Traverse(traverse_types),
2276 gogo_(gogo), interfaces_(interfaces)
2285 // A list of locally defined interfaces which have hidden methods.
2286 const std::vector<Interface_type*>& interfaces_;
2289 // Build all required interface method tables for types. We need to
2290 // ensure that we have an interface method table for every interface
2291 // which has a hidden method, for every named type which implements
2292 // that interface. Normally we can just build interface method tables
2293 // as we need them. However, in some cases we can require an
2294 // interface method table for an interface defined in a different
2295 // package for a type defined in that package. If that interface and
2296 // type both use a hidden method, that is OK. However, we will not be
2297 // able to build that interface method table when we need it, because
2298 // the type's hidden method will be static. So we have to build it
2299 // here, and just refer it from other packages as needed.
2302 Gogo::build_interface_method_tables()
2304 std::vector<Interface_type*> hidden_interfaces;
2305 hidden_interfaces.reserve(this->interface_types_.size());
2306 for (std::vector<Interface_type*>::const_iterator pi =
2307 this->interface_types_.begin();
2308 pi != this->interface_types_.end();
2311 const Typed_identifier_list* methods = (*pi)->methods();
2312 if (methods == NULL)
2314 for (Typed_identifier_list::const_iterator pm = methods->begin();
2315 pm != methods->end();
2318 if (Gogo::is_hidden_name(pm->name()))
2320 hidden_interfaces.push_back(*pi);
2326 if (!hidden_interfaces.empty())
2328 // Now traverse the tree looking for all named types.
2329 Build_method_tables bmt(this, hidden_interfaces);
2330 this->traverse(&bmt);
2333 // We no longer need the list of interfaces.
2335 this->interface_types_.clear();
2338 // This is called for each type. For a named type, for each of the
2339 // interfaces with hidden methods that it implements, create the
2343 Build_method_tables::type(Type* type)
2345 Named_type* nt = type->named_type();
2348 for (std::vector<Interface_type*>::const_iterator p =
2349 this->interfaces_.begin();
2350 p != this->interfaces_.end();
2353 // We ask whether a pointer to the named type implements the
2354 // interface, because a pointer can implement more methods
2356 if ((*p)->implements_interface(Type::make_pointer_type(nt), NULL))
2358 nt->interface_method_table(this->gogo_, *p, false);
2359 nt->interface_method_table(this->gogo_, *p, true);
2363 return TRAVERSE_CONTINUE;
2366 // Traversal class used to check for return statements.
2368 class Check_return_statements_traverse : public Traverse
2371 Check_return_statements_traverse()
2372 : Traverse(traverse_functions)
2376 function(Named_object*);
2379 // Check that a function has a return statement if it needs one.
2382 Check_return_statements_traverse::function(Named_object* no)
2384 Function* func = no->func_value();
2385 const Function_type* fntype = func->type();
2386 const Typed_identifier_list* results = fntype->results();
2388 // We only need a return statement if there is a return value.
2389 if (results == NULL || results->empty())
2390 return TRAVERSE_CONTINUE;
2392 if (func->block()->may_fall_through())
2393 error_at(func->location(), "control reaches end of non-void function");
2395 return TRAVERSE_CONTINUE;
2398 // Check return statements.
2401 Gogo::check_return_statements()
2403 Check_return_statements_traverse traverse;
2404 this->traverse(&traverse);
2407 // Get the unique prefix to use before all exported symbols. This
2408 // must be unique across the entire link.
2411 Gogo::unique_prefix() const
2413 gcc_assert(!this->unique_prefix_.empty());
2414 return this->unique_prefix_;
2417 // Set the unique prefix to use before all exported symbols. This
2418 // comes from the command line option -fgo-prefix=XXX.
2421 Gogo::set_unique_prefix(const std::string& arg)
2423 gcc_assert(this->unique_prefix_.empty());
2424 this->unique_prefix_ = arg;
2427 // Work out the package priority. It is one more than the maximum
2428 // priority of an imported package.
2431 Gogo::package_priority() const
2434 for (Packages::const_iterator p = this->packages_.begin();
2435 p != this->packages_.end();
2437 if (p->second->priority() > priority)
2438 priority = p->second->priority();
2439 return priority + 1;
2442 // Export identifiers as requested.
2447 // For now we always stream to a section. Later we may want to
2448 // support streaming to a separate file.
2449 Stream_to_section stream;
2451 Export exp(&stream);
2452 exp.register_builtin_types(this);
2453 exp.export_globals(this->package_name(),
2454 this->unique_prefix(),
2455 this->package_priority(),
2456 (this->need_init_fn_ && this->package_name() != "main"
2457 ? this->get_init_fn_name()
2459 this->imported_init_fns_,
2460 this->package_->bindings());
2465 Function::Function(Function_type* type, Function* enclosing, Block* block,
2466 source_location location)
2467 : type_(type), enclosing_(enclosing), named_results_(NULL),
2468 closure_var_(NULL), block_(block), location_(location), fndecl_(NULL),
2469 defer_stack_(NULL), calls_recover_(false), is_recover_thunk_(false),
2470 has_recover_thunk_(false)
2474 // Create the named result variables.
2477 Function::create_named_result_variables(Gogo* gogo)
2479 const Typed_identifier_list* results = this->type_->results();
2482 || results->front().name().empty())
2485 this->named_results_ = new Named_results();
2486 this->named_results_->reserve(results->size());
2488 Block* block = this->block_;
2490 for (Typed_identifier_list::const_iterator p = results->begin();
2491 p != results->end();
2494 std::string name = p->name();
2495 if (Gogo::is_sink_name(name))
2497 static int unnamed_result_counter;
2499 snprintf(buf, sizeof buf, "_$%d", unnamed_result_counter);
2500 ++unnamed_result_counter;
2501 name = gogo->pack_hidden_name(buf, false);
2503 Result_variable* result = new Result_variable(p->type(), this, index);
2504 Named_object* no = block->bindings()->add_result_variable(name, result);
2505 this->named_results_->push_back(no);
2509 // Return the closure variable, creating it if necessary.
2512 Function::closure_var()
2514 if (this->closure_var_ == NULL)
2516 // We don't know the type of the variable yet. We add fields as
2518 source_location loc = this->type_->location();
2519 Struct_field_list* sfl = new Struct_field_list;
2520 Type* struct_type = Type::make_struct_type(sfl, loc);
2521 Variable* var = new Variable(Type::make_pointer_type(struct_type),
2522 NULL, false, true, false, loc);
2523 this->closure_var_ = Named_object::make_variable("closure", NULL, var);
2524 // Note that the new variable is not in any binding contour.
2526 return this->closure_var_;
2529 // Set the type of the closure variable.
2532 Function::set_closure_type()
2534 if (this->closure_var_ == NULL)
2536 Named_object* closure = this->closure_var_;
2537 Struct_type* st = closure->var_value()->type()->deref()->struct_type();
2538 unsigned int index = 0;
2539 for (Closure_fields::const_iterator p = this->closure_fields_.begin();
2540 p != this->closure_fields_.end();
2543 Named_object* no = p->first;
2545 snprintf(buf, sizeof buf, "%u", index);
2546 std::string n = no->name() + buf;
2548 if (no->is_variable())
2549 var_type = no->var_value()->type();
2551 var_type = no->result_var_value()->type();
2552 Type* field_type = Type::make_pointer_type(var_type);
2553 st->push_field(Struct_field(Typed_identifier(n, field_type, p->second)));
2557 // Return whether this function is a method.
2560 Function::is_method() const
2562 return this->type_->is_method();
2565 // Add a label definition.
2568 Function::add_label_definition(const std::string& label_name,
2569 source_location location)
2571 Label* lnull = NULL;
2572 std::pair<Labels::iterator, bool> ins =
2573 this->labels_.insert(std::make_pair(label_name, lnull));
2576 // This is a new label.
2577 Label* label = new Label(label_name);
2578 label->define(location);
2579 ins.first->second = label;
2584 // The label was already in the hash table.
2585 Label* label = ins.first->second;
2586 if (!label->is_defined())
2588 label->define(location);
2593 error_at(location, "redefinition of label %qs",
2594 Gogo::message_name(label_name).c_str());
2595 inform(label->location(), "previous definition of %qs was here",
2596 Gogo::message_name(label_name).c_str());
2597 return new Label(label_name);
2602 // Add a reference to a label.
2605 Function::add_label_reference(const std::string& label_name)
2607 Label* lnull = NULL;
2608 std::pair<Labels::iterator, bool> ins =
2609 this->labels_.insert(std::make_pair(label_name, lnull));
2612 // The label was already in the hash table.
2613 return ins.first->second;
2617 gcc_assert(ins.first->second == NULL);
2618 Label* label = new Label(label_name);
2619 ins.first->second = label;
2624 // Swap one function with another. This is used when building the
2625 // thunk we use to call a function which calls recover. It may not
2626 // work for any other case.
2629 Function::swap_for_recover(Function *x)
2631 gcc_assert(this->enclosing_ == x->enclosing_);
2632 gcc_assert(this->named_results_ == x->named_results_);
2633 std::swap(this->closure_var_, x->closure_var_);
2634 std::swap(this->block_, x->block_);
2635 gcc_assert(this->location_ == x->location_);
2636 gcc_assert(this->fndecl_ == NULL && x->fndecl_ == NULL);
2637 gcc_assert(this->defer_stack_ == NULL && x->defer_stack_ == NULL);
2640 // Traverse the tree.
2643 Function::traverse(Traverse* traverse)
2645 unsigned int traverse_mask = traverse->traverse_mask();
2648 & (Traverse::traverse_types | Traverse::traverse_expressions))
2651 if (Type::traverse(this->type_, traverse) == TRAVERSE_EXIT)
2652 return TRAVERSE_EXIT;
2655 // FIXME: We should check traverse_functions here if nested
2656 // functions are stored in block bindings.
2657 if (this->block_ != NULL
2659 & (Traverse::traverse_variables
2660 | Traverse::traverse_constants
2661 | Traverse::traverse_blocks
2662 | Traverse::traverse_statements
2663 | Traverse::traverse_expressions
2664 | Traverse::traverse_types)) != 0)
2666 if (this->block_->traverse(traverse) == TRAVERSE_EXIT)
2667 return TRAVERSE_EXIT;
2670 return TRAVERSE_CONTINUE;
2673 // Work out types for unspecified variables and constants.
2676 Function::determine_types()
2678 if (this->block_ != NULL)
2679 this->block_->determine_types();
2682 // Export the function.
2685 Function::export_func(Export* exp, const std::string& name) const
2687 Function::export_func_with_type(exp, name, this->type_);
2690 // Export a function with a type.
2693 Function::export_func_with_type(Export* exp, const std::string& name,
2694 const Function_type* fntype)
2696 exp->write_c_string("func ");
2698 if (fntype->is_method())
2700 exp->write_c_string("(");
2701 exp->write_type(fntype->receiver()->type());
2702 exp->write_c_string(") ");
2705 exp->write_string(name);
2707 exp->write_c_string(" (");
2708 const Typed_identifier_list* parameters = fntype->parameters();
2709 if (parameters != NULL)
2711 bool is_varargs = fntype->is_varargs();
2713 for (Typed_identifier_list::const_iterator p = parameters->begin();
2714 p != parameters->end();
2720 exp->write_c_string(", ");
2721 if (!is_varargs || p + 1 != parameters->end())
2722 exp->write_type(p->type());
2725 exp->write_c_string("...");
2726 exp->write_type(p->type()->array_type()->element_type());
2730 exp->write_c_string(")");
2732 const Typed_identifier_list* results = fntype->results();
2733 if (results != NULL)
2735 if (results->size() == 1)
2737 exp->write_c_string(" ");
2738 exp->write_type(results->begin()->type());
2742 exp->write_c_string(" (");
2744 for (Typed_identifier_list::const_iterator p = results->begin();
2745 p != results->end();
2751 exp->write_c_string(", ");
2752 exp->write_type(p->type());
2754 exp->write_c_string(")");
2757 exp->write_c_string(";\n");
2760 // Import a function.
2763 Function::import_func(Import* imp, std::string* pname,
2764 Typed_identifier** preceiver,
2765 Typed_identifier_list** pparameters,
2766 Typed_identifier_list** presults,
2769 imp->require_c_string("func ");
2772 if (imp->peek_char() == '(')
2774 imp->require_c_string("(");
2775 Type* rtype = imp->read_type();
2776 *preceiver = new Typed_identifier(Import::import_marker, rtype,
2778 imp->require_c_string(") ");
2781 *pname = imp->read_identifier();
2783 Typed_identifier_list* parameters;
2784 *is_varargs = false;
2785 imp->require_c_string(" (");
2786 if (imp->peek_char() == ')')
2790 parameters = new Typed_identifier_list();
2793 if (imp->match_c_string("..."))
2799 Type* ptype = imp->read_type();
2801 ptype = Type::make_array_type(ptype, NULL);
2802 parameters->push_back(Typed_identifier(Import::import_marker,
2803 ptype, imp->location()));
2804 if (imp->peek_char() != ',')
2806 gcc_assert(!*is_varargs);
2807 imp->require_c_string(", ");
2810 imp->require_c_string(")");
2811 *pparameters = parameters;
2813 Typed_identifier_list* results;
2814 if (imp->peek_char() != ' ')
2818 results = new Typed_identifier_list();
2819 imp->require_c_string(" ");
2820 if (imp->peek_char() != '(')
2822 Type* rtype = imp->read_type();
2823 results->push_back(Typed_identifier(Import::import_marker, rtype,
2828 imp->require_c_string("(");
2831 Type* rtype = imp->read_type();
2832 results->push_back(Typed_identifier(Import::import_marker,
2833 rtype, imp->location()));
2834 if (imp->peek_char() != ',')
2836 imp->require_c_string(", ");
2838 imp->require_c_string(")");
2841 imp->require_c_string(";\n");
2842 *presults = results;
2847 Block::Block(Block* enclosing, source_location location)
2848 : enclosing_(enclosing), statements_(),
2849 bindings_(new Bindings(enclosing == NULL
2851 : enclosing->bindings())),
2852 start_location_(location),
2853 end_location_(UNKNOWN_LOCATION)
2857 // Add a statement to a block.
2860 Block::add_statement(Statement* statement)
2862 this->statements_.push_back(statement);
2865 // Add a statement to the front of a block. This is slow but is only
2866 // used for reference counts of parameters.
2869 Block::add_statement_at_front(Statement* statement)
2871 this->statements_.insert(this->statements_.begin(), statement);
2874 // Replace a statement in a block.
2877 Block::replace_statement(size_t index, Statement* s)
2879 gcc_assert(index < this->statements_.size());
2880 this->statements_[index] = s;
2883 // Add a statement before another statement.
2886 Block::insert_statement_before(size_t index, Statement* s)
2888 gcc_assert(index < this->statements_.size());
2889 this->statements_.insert(this->statements_.begin() + index, s);
2892 // Add a statement after another statement.
2895 Block::insert_statement_after(size_t index, Statement* s)
2897 gcc_assert(index < this->statements_.size());
2898 this->statements_.insert(this->statements_.begin() + index + 1, s);
2901 // Traverse the tree.
2904 Block::traverse(Traverse* traverse)
2906 unsigned int traverse_mask = traverse->traverse_mask();
2908 if ((traverse_mask & Traverse::traverse_blocks) != 0)
2910 int t = traverse->block(this);
2911 if (t == TRAVERSE_EXIT)
2912 return TRAVERSE_EXIT;
2913 else if (t == TRAVERSE_SKIP_COMPONENTS)
2914 return TRAVERSE_CONTINUE;
2918 & (Traverse::traverse_variables
2919 | Traverse::traverse_constants
2920 | Traverse::traverse_expressions
2921 | Traverse::traverse_types)) != 0)
2923 for (Bindings::const_definitions_iterator pb =
2924 this->bindings_->begin_definitions();
2925 pb != this->bindings_->end_definitions();
2928 switch ((*pb)->classification())
2930 case Named_object::NAMED_OBJECT_CONST:
2931 if ((traverse_mask & Traverse::traverse_constants) != 0)
2933 if (traverse->constant(*pb, false) == TRAVERSE_EXIT)
2934 return TRAVERSE_EXIT;
2936 if ((traverse_mask & Traverse::traverse_types) != 0
2937 || (traverse_mask & Traverse::traverse_expressions) != 0)
2939 Type* t = (*pb)->const_value()->type();
2941 && Type::traverse(t, traverse) == TRAVERSE_EXIT)
2942 return TRAVERSE_EXIT;
2944 if ((traverse_mask & Traverse::traverse_expressions) != 0
2945 || (traverse_mask & Traverse::traverse_types) != 0)
2947 if ((*pb)->const_value()->traverse_expression(traverse)
2949 return TRAVERSE_EXIT;
2953 case Named_object::NAMED_OBJECT_VAR:
2954 case Named_object::NAMED_OBJECT_RESULT_VAR:
2955 if ((traverse_mask & Traverse::traverse_variables) != 0)
2957 if (traverse->variable(*pb) == TRAVERSE_EXIT)
2958 return TRAVERSE_EXIT;
2960 if (((traverse_mask & Traverse::traverse_types) != 0
2961 || (traverse_mask & Traverse::traverse_expressions) != 0)
2962 && ((*pb)->is_result_variable()
2963 || (*pb)->var_value()->has_type()))
2965 Type* t = ((*pb)->is_variable()
2966 ? (*pb)->var_value()->type()
2967 : (*pb)->result_var_value()->type());
2969 && Type::traverse(t, traverse) == TRAVERSE_EXIT)
2970 return TRAVERSE_EXIT;
2972 if ((*pb)->is_variable()
2973 && ((traverse_mask & Traverse::traverse_expressions) != 0
2974 || (traverse_mask & Traverse::traverse_types) != 0))
2976 if ((*pb)->var_value()->traverse_expression(traverse)
2978 return TRAVERSE_EXIT;
2982 case Named_object::NAMED_OBJECT_FUNC:
2983 case Named_object::NAMED_OBJECT_FUNC_DECLARATION:
2984 // FIXME: Where will nested functions be found?
2987 case Named_object::NAMED_OBJECT_TYPE:
2988 if ((traverse_mask & Traverse::traverse_types) != 0
2989 || (traverse_mask & Traverse::traverse_expressions) != 0)
2991 if (Type::traverse((*pb)->type_value(), traverse)
2993 return TRAVERSE_EXIT;
2997 case Named_object::NAMED_OBJECT_TYPE_DECLARATION:
2998 case Named_object::NAMED_OBJECT_UNKNOWN:
3001 case Named_object::NAMED_OBJECT_PACKAGE:
3002 case Named_object::NAMED_OBJECT_SINK:
3011 // No point in checking traverse_mask here--if we got here we always
3012 // want to walk the statements. The traversal can insert new
3013 // statements before or after the current statement. Inserting
3014 // statements before the current statement requires updating I via
3015 // the pointer; those statements will not be traversed. Any new
3016 // statements inserted after the current statement will be traversed
3018 for (size_t i = 0; i < this->statements_.size(); ++i)
3020 if (this->statements_[i]->traverse(this, &i, traverse) == TRAVERSE_EXIT)
3021 return TRAVERSE_EXIT;
3024 return TRAVERSE_CONTINUE;
3027 // Work out types for unspecified variables and constants.
3030 Block::determine_types()
3032 for (Bindings::const_definitions_iterator pb =
3033 this->bindings_->begin_definitions();
3034 pb != this->bindings_->end_definitions();
3037 if ((*pb)->is_variable())
3038 (*pb)->var_value()->determine_type();
3039 else if ((*pb)->is_const())
3040 (*pb)->const_value()->determine_type();
3043 for (std::vector<Statement*>::const_iterator ps = this->statements_.begin();
3044 ps != this->statements_.end();
3046 (*ps)->determine_types();
3049 // Return true if the statements in this block may fall through.
3052 Block::may_fall_through() const
3054 if (this->statements_.empty())
3056 return this->statements_.back()->may_fall_through();
3061 Variable::Variable(Type* type, Expression* init, bool is_global,
3062 bool is_parameter, bool is_receiver,
3063 source_location location)
3064 : type_(type), init_(init), preinit_(NULL), location_(location),
3065 is_global_(is_global), is_parameter_(is_parameter),
3066 is_receiver_(is_receiver), is_varargs_parameter_(false),
3067 is_address_taken_(false), seen_(false), init_is_lowered_(false),
3068 type_from_init_tuple_(false), type_from_range_index_(false),
3069 type_from_range_value_(false), type_from_chan_element_(false),
3070 is_type_switch_var_(false)
3072 gcc_assert(type != NULL || init != NULL);
3073 gcc_assert(!is_parameter || init == NULL);
3076 // Traverse the initializer expression.
3079 Variable::traverse_expression(Traverse* traverse)
3081 if (this->preinit_ != NULL)
3083 if (this->preinit_->traverse(traverse) == TRAVERSE_EXIT)
3084 return TRAVERSE_EXIT;
3086 if (this->init_ != NULL)
3088 if (Expression::traverse(&this->init_, traverse) == TRAVERSE_EXIT)
3089 return TRAVERSE_EXIT;
3091 return TRAVERSE_CONTINUE;
3094 // Lower the initialization expression after parsing is complete.
3097 Variable::lower_init_expression(Gogo* gogo, Named_object* function)
3099 if (this->init_ != NULL && !this->init_is_lowered_)
3103 // We will give an error elsewhere, this is just to prevent
3104 // an infinite loop.
3109 gogo->lower_expression(function, &this->init_);
3111 this->seen_ = false;
3113 this->init_is_lowered_ = true;
3117 // Get the preinit block.
3120 Variable::preinit_block()
3122 gcc_assert(this->is_global_);
3123 if (this->preinit_ == NULL)
3124 this->preinit_ = new Block(NULL, this->location());
3125 return this->preinit_;
3128 // Add a statement to be run before the initialization expression.
3131 Variable::add_preinit_statement(Statement* s)
3133 Block* b = this->preinit_block();
3134 b->add_statement(s);
3135 b->set_end_location(s->location());
3138 // In an assignment which sets a variable to a tuple of EXPR, return
3139 // the type of the first element of the tuple.
3142 Variable::type_from_tuple(Expression* expr, bool report_error) const
3144 if (expr->map_index_expression() != NULL)
3145 return expr->map_index_expression()->get_map_type()->val_type();
3146 else if (expr->receive_expression() != NULL)
3148 Expression* channel = expr->receive_expression()->channel();
3149 Type* channel_type = channel->type();
3150 if (channel_type->is_error_type())
3151 return Type::make_error_type();
3152 return channel_type->channel_type()->element_type();
3157 error_at(this->location(), "invalid tuple definition");
3158 return Type::make_error_type();
3162 // Given EXPR used in a range clause, return either the index type or
3163 // the value type of the range, depending upon GET_INDEX_TYPE.
3166 Variable::type_from_range(Expression* expr, bool get_index_type,
3167 bool report_error) const
3169 Type* t = expr->type();
3170 if (t->array_type() != NULL
3171 || (t->points_to() != NULL
3172 && t->points_to()->array_type() != NULL
3173 && !t->points_to()->is_open_array_type()))
3176 return Type::lookup_integer_type("int");
3178 return t->deref()->array_type()->element_type();
3180 else if (t->is_string_type())
3181 return Type::lookup_integer_type("int");
3182 else if (t->map_type() != NULL)
3185 return t->map_type()->key_type();
3187 return t->map_type()->val_type();
3189 else if (t->channel_type() != NULL)
3192 return t->channel_type()->element_type();
3196 error_at(this->location(),
3197 "invalid definition of value variable for channel range");
3198 return Type::make_error_type();
3204 error_at(this->location(), "invalid type for range clause");
3205 return Type::make_error_type();
3209 // EXPR should be a channel. Return the channel's element type.
3212 Variable::type_from_chan_element(Expression* expr, bool report_error) const
3214 Type* t = expr->type();
3215 if (t->channel_type() != NULL)
3216 return t->channel_type()->element_type();
3220 error_at(this->location(), "expected channel");
3221 return Type::make_error_type();
3225 // Return the type of the Variable. This may be called before
3226 // Variable::determine_type is called, which means that we may need to
3227 // get the type from the initializer. FIXME: If we combine lowering
3228 // with type determination, then this should be unnecessary.
3233 // A variable in a type switch with a nil case will have the wrong
3234 // type here. This gets fixed up in determine_type, below.
3235 Type* type = this->type_;
3236 Expression* init = this->init_;
3237 if (this->is_type_switch_var_
3238 && this->type_->is_nil_constant_as_type())
3240 Type_guard_expression* tge = this->init_->type_guard_expression();
3241 gcc_assert(tge != NULL);
3248 if (this->type_ == NULL || !this->type_->is_error_type())
3250 error_at(this->location_, "variable initializer refers to itself");
3251 this->type_ = Type::make_error_type();
3260 else if (this->type_from_init_tuple_)
3261 type = this->type_from_tuple(init, false);
3262 else if (this->type_from_range_index_ || this->type_from_range_value_)
3263 type = this->type_from_range(init, this->type_from_range_index_, false);
3264 else if (this->type_from_chan_element_)
3265 type = this->type_from_chan_element(init, false);
3268 gcc_assert(init != NULL);
3269 type = init->type();
3270 gcc_assert(type != NULL);
3272 // Variables should not have abstract types.
3273 if (type->is_abstract())
3274 type = type->make_non_abstract_type();
3276 if (type->is_void_type())
3277 type = Type::make_error_type();
3280 this->seen_ = false;
3285 // Fetch the type from a const pointer, in which case it should have
3286 // been set already.
3289 Variable::type() const
3291 gcc_assert(this->type_ != NULL);
3295 // Set the type if necessary.
3298 Variable::determine_type()
3300 // A variable in a type switch with a nil case will have the wrong
3301 // type here. It will have an initializer which is a type guard.
3302 // We want to initialize it to the value without the type guard, and
3303 // use the type of that value as well.
3304 if (this->is_type_switch_var_ && this->type_->is_nil_constant_as_type())
3306 Type_guard_expression* tge = this->init_->type_guard_expression();
3307 gcc_assert(tge != NULL);
3309 this->init_ = tge->expr();
3312 if (this->init_ == NULL)
3313 gcc_assert(this->type_ != NULL && !this->type_->is_abstract());
3314 else if (this->type_from_init_tuple_)
3316 Expression *init = this->init_;
3317 init->determine_type_no_context();
3318 this->type_ = this->type_from_tuple(init, true);
3321 else if (this->type_from_range_index_ || this->type_from_range_value_)
3323 Expression* init = this->init_;
3324 init->determine_type_no_context();
3325 this->type_ = this->type_from_range(init, this->type_from_range_index_,
3331 // type_from_chan_element_ should have been cleared during
3333 gcc_assert(!this->type_from_chan_element_);
3335 Type_context context(this->type_, false);
3336 this->init_->determine_type(&context);
3337 if (this->type_ == NULL)
3339 Type* type = this->init_->type();
3340 gcc_assert(type != NULL);
3341 if (type->is_abstract())
3342 type = type->make_non_abstract_type();
3344 if (type->is_void_type())
3346 error_at(this->location_, "variable has no type");
3347 type = Type::make_error_type();
3349 else if (type->is_nil_type())
3351 error_at(this->location_, "variable defined to nil type");
3352 type = Type::make_error_type();
3354 else if (type->is_call_multiple_result_type())
3356 error_at(this->location_,
3357 "single variable set to multiple value function call");
3358 type = Type::make_error_type();
3366 // Export the variable
3369 Variable::export_var(Export* exp, const std::string& name) const
3371 gcc_assert(this->is_global_);
3372 exp->write_c_string("var ");
3373 exp->write_string(name);
3374 exp->write_c_string(" ");
3375 exp->write_type(this->type());
3376 exp->write_c_string(";\n");
3379 // Import a variable.
3382 Variable::import_var(Import* imp, std::string* pname, Type** ptype)
3384 imp->require_c_string("var ");
3385 *pname = imp->read_identifier();
3386 imp->require_c_string(" ");
3387 *ptype = imp->read_type();
3388 imp->require_c_string(";\n");
3391 // Class Named_constant.
3393 // Traverse the initializer expression.
3396 Named_constant::traverse_expression(Traverse* traverse)
3398 return Expression::traverse(&this->expr_, traverse);
3401 // Determine the type of the constant.
3404 Named_constant::determine_type()
3406 if (this->type_ != NULL)
3408 Type_context context(this->type_, false);
3409 this->expr_->determine_type(&context);
3413 // A constant may have an abstract type.
3414 Type_context context(NULL, true);
3415 this->expr_->determine_type(&context);
3416 this->type_ = this->expr_->type();
3417 gcc_assert(this->type_ != NULL);
3421 // Indicate that we found and reported an error for this constant.
3424 Named_constant::set_error()
3426 this->type_ = Type::make_error_type();
3427 this->expr_ = Expression::make_error(this->location_);
3430 // Export a constant.
3433 Named_constant::export_const(Export* exp, const std::string& name) const
3435 exp->write_c_string("const ");
3436 exp->write_string(name);
3437 exp->write_c_string(" ");
3438 if (!this->type_->is_abstract())
3440 exp->write_type(this->type_);
3441 exp->write_c_string(" ");
3443 exp->write_c_string("= ");
3444 this->expr()->export_expression(exp);
3445 exp->write_c_string(";\n");
3448 // Import a constant.
3451 Named_constant::import_const(Import* imp, std::string* pname, Type** ptype,
3454 imp->require_c_string("const ");
3455 *pname = imp->read_identifier();
3456 imp->require_c_string(" ");
3457 if (imp->peek_char() == '=')
3461 *ptype = imp->read_type();
3462 imp->require_c_string(" ");
3464 imp->require_c_string("= ");
3465 *pexpr = Expression::import_expression(imp);
3466 imp->require_c_string(";\n");
3472 Type_declaration::add_method(const std::string& name, Function* function)
3474 Named_object* ret = Named_object::make_function(name, NULL, function);
3475 this->methods_.push_back(ret);
3479 // Add a method declaration.
3482 Type_declaration::add_method_declaration(const std::string& name,
3483 Function_type* type,
3484 source_location location)
3486 Named_object* ret = Named_object::make_function_declaration(name, NULL, type,
3488 this->methods_.push_back(ret);
3492 // Return whether any methods ere defined.
3495 Type_declaration::has_methods() const
3497 return !this->methods_.empty();
3500 // Define methods for the real type.
3503 Type_declaration::define_methods(Named_type* nt)
3505 for (Methods::const_iterator p = this->methods_.begin();
3506 p != this->methods_.end();
3508 nt->add_existing_method(*p);
3511 // We are using the type. Return true if we should issue a warning.
3514 Type_declaration::using_type()
3516 bool ret = !this->issued_warning_;
3517 this->issued_warning_ = true;
3521 // Class Unknown_name.
3523 // Set the real named object.
3526 Unknown_name::set_real_named_object(Named_object* no)
3528 gcc_assert(this->real_named_object_ == NULL);
3529 gcc_assert(!no->is_unknown());
3530 this->real_named_object_ = no;
3533 // Class Named_object.
3535 Named_object::Named_object(const std::string& name,
3536 const Package* package,
3537 Classification classification)
3538 : name_(name), package_(package), classification_(classification),
3541 if (Gogo::is_sink_name(name))
3542 gcc_assert(classification == NAMED_OBJECT_SINK);
3545 // Make an unknown name. This is used by the parser. The name must
3546 // be resolved later. Unknown names are only added in the current
3550 Named_object::make_unknown_name(const std::string& name,
3551 source_location location)
3553 Named_object* named_object = new Named_object(name, NULL,
3554 NAMED_OBJECT_UNKNOWN);
3555 Unknown_name* value = new Unknown_name(location);
3556 named_object->u_.unknown_value = value;
3557 return named_object;
3563 Named_object::make_constant(const Typed_identifier& tid,
3564 const Package* package, Expression* expr,
3567 Named_object* named_object = new Named_object(tid.name(), package,
3568 NAMED_OBJECT_CONST);
3569 Named_constant* named_constant = new Named_constant(tid.type(), expr,
3572 named_object->u_.const_value = named_constant;
3573 return named_object;
3576 // Make a named type.
3579 Named_object::make_type(const std::string& name, const Package* package,
3580 Type* type, source_location location)
3582 Named_object* named_object = new Named_object(name, package,
3584 Named_type* named_type = Type::make_named_type(named_object, type, location);
3585 named_object->u_.type_value = named_type;
3586 return named_object;
3589 // Make a type declaration.
3592 Named_object::make_type_declaration(const std::string& name,
3593 const Package* package,
3594 source_location location)
3596 Named_object* named_object = new Named_object(name, package,
3597 NAMED_OBJECT_TYPE_DECLARATION);
3598 Type_declaration* type_declaration = new Type_declaration(location);
3599 named_object->u_.type_declaration = type_declaration;
3600 return named_object;
3606 Named_object::make_variable(const std::string& name, const Package* package,
3609 Named_object* named_object = new Named_object(name, package,
3611 named_object->u_.var_value = variable;
3612 return named_object;
3615 // Make a result variable.
3618 Named_object::make_result_variable(const std::string& name,
3619 Result_variable* result)
3621 Named_object* named_object = new Named_object(name, NULL,
3622 NAMED_OBJECT_RESULT_VAR);
3623 named_object->u_.result_var_value = result;
3624 return named_object;
3627 // Make a sink. This is used for the special blank identifier _.
3630 Named_object::make_sink()
3632 return new Named_object("_", NULL, NAMED_OBJECT_SINK);
3635 // Make a named function.
3638 Named_object::make_function(const std::string& name, const Package* package,
3641 Named_object* named_object = new Named_object(name, package,
3643 named_object->u_.func_value = function;
3644 return named_object;
3647 // Make a function declaration.
3650 Named_object::make_function_declaration(const std::string& name,
3651 const Package* package,
3652 Function_type* fntype,
3653 source_location location)
3655 Named_object* named_object = new Named_object(name, package,
3656 NAMED_OBJECT_FUNC_DECLARATION);
3657 Function_declaration *func_decl = new Function_declaration(fntype, location);
3658 named_object->u_.func_declaration_value = func_decl;
3659 return named_object;
3665 Named_object::make_package(const std::string& alias, Package* package)
3667 Named_object* named_object = new Named_object(alias, NULL,
3668 NAMED_OBJECT_PACKAGE);
3669 named_object->u_.package_value = package;
3670 return named_object;
3673 // Return the name to use in an error message.
3676 Named_object::message_name() const
3678 if (this->package_ == NULL)
3679 return Gogo::message_name(this->name_);
3680 std::string ret = Gogo::message_name(this->package_->name());
3682 ret += Gogo::message_name(this->name_);
3686 // Set the type when a declaration is defined.
3689 Named_object::set_type_value(Named_type* named_type)
3691 gcc_assert(this->classification_ == NAMED_OBJECT_TYPE_DECLARATION);
3692 Type_declaration* td = this->u_.type_declaration;
3693 td->define_methods(named_type);
3694 Named_object* in_function = td->in_function();
3695 if (in_function != NULL)
3696 named_type->set_in_function(in_function);
3698 this->classification_ = NAMED_OBJECT_TYPE;
3699 this->u_.type_value = named_type;
3702 // Define a function which was previously declared.
3705 Named_object::set_function_value(Function* function)
3707 gcc_assert(this->classification_ == NAMED_OBJECT_FUNC_DECLARATION);
3708 this->classification_ = NAMED_OBJECT_FUNC;
3709 // FIXME: We should free the old value.
3710 this->u_.func_value = function;
3713 // Return the location of a named object.
3716 Named_object::location() const
3718 switch (this->classification_)
3721 case NAMED_OBJECT_UNINITIALIZED:
3724 case NAMED_OBJECT_UNKNOWN:
3725 return this->unknown_value()->location();
3727 case NAMED_OBJECT_CONST:
3728 return this->const_value()->location();
3730 case NAMED_OBJECT_TYPE:
3731 return this->type_value()->location();
3733 case NAMED_OBJECT_TYPE_DECLARATION:
3734 return this->type_declaration_value()->location();
3736 case NAMED_OBJECT_VAR:
3737 return this->var_value()->location();
3739 case NAMED_OBJECT_RESULT_VAR:
3740 return this->result_var_value()->function()->location();
3742 case NAMED_OBJECT_SINK:
3745 case NAMED_OBJECT_FUNC:
3746 return this->func_value()->location();
3748 case NAMED_OBJECT_FUNC_DECLARATION:
3749 return this->func_declaration_value()->location();
3751 case NAMED_OBJECT_PACKAGE:
3752 return this->package_value()->location();
3756 // Export a named object.
3759 Named_object::export_named_object(Export* exp) const
3761 switch (this->classification_)
3764 case NAMED_OBJECT_UNINITIALIZED:
3765 case NAMED_OBJECT_UNKNOWN:
3768 case NAMED_OBJECT_CONST:
3769 this->const_value()->export_const(exp, this->name_);
3772 case NAMED_OBJECT_TYPE:
3773 this->type_value()->export_named_type(exp, this->name_);
3776 case NAMED_OBJECT_TYPE_DECLARATION:
3777 error_at(this->type_declaration_value()->location(),
3778 "attempt to export %<%s%> which was declared but not defined",
3779 this->message_name().c_str());
3782 case NAMED_OBJECT_FUNC_DECLARATION:
3783 this->func_declaration_value()->export_func(exp, this->name_);
3786 case NAMED_OBJECT_VAR:
3787 this->var_value()->export_var(exp, this->name_);
3790 case NAMED_OBJECT_RESULT_VAR:
3791 case NAMED_OBJECT_SINK:
3794 case NAMED_OBJECT_FUNC:
3795 this->func_value()->export_func(exp, this->name_);
3802 Bindings::Bindings(Bindings* enclosing)
3803 : enclosing_(enclosing), named_objects_(), bindings_()
3810 Bindings::clear_file_scope()
3812 Contour::iterator p = this->bindings_.begin();
3813 while (p != this->bindings_.end())
3816 if (p->second->package() != NULL)
3818 else if (p->second->is_package())
3820 else if (p->second->is_function()
3821 && !p->second->func_value()->type()->is_method()
3822 && Gogo::unpack_hidden_name(p->second->name()) == "init")
3830 p = this->bindings_.erase(p);
3834 // Look up a symbol.
3837 Bindings::lookup(const std::string& name) const
3839 Contour::const_iterator p = this->bindings_.find(name);
3840 if (p != this->bindings_.end())
3841 return p->second->resolve();
3842 else if (this->enclosing_ != NULL)
3843 return this->enclosing_->lookup(name);
3848 // Look up a symbol locally.
3851 Bindings::lookup_local(const std::string& name) const
3853 Contour::const_iterator p = this->bindings_.find(name);
3854 if (p == this->bindings_.end())
3859 // Remove an object from a set of bindings. This is used for a
3860 // special case in thunks for functions which call recover.
3863 Bindings::remove_binding(Named_object* no)
3865 Contour::iterator pb = this->bindings_.find(no->name());
3866 gcc_assert(pb != this->bindings_.end());
3867 this->bindings_.erase(pb);
3868 for (std::vector<Named_object*>::iterator pn = this->named_objects_.begin();
3869 pn != this->named_objects_.end();
3874 this->named_objects_.erase(pn);
3881 // Add a method to the list of objects. This is not added to the
3882 // lookup table. This is so that we have a single list of objects
3883 // declared at the top level, which we walk through when it's time to
3884 // convert to trees.
3887 Bindings::add_method(Named_object* method)
3889 this->named_objects_.push_back(method);
3892 // Add a generic Named_object to a Contour.
3895 Bindings::add_named_object_to_contour(Contour* contour,
3896 Named_object* named_object)
3898 gcc_assert(named_object == named_object->resolve());
3899 const std::string& name(named_object->name());
3900 gcc_assert(!Gogo::is_sink_name(name));
3902 std::pair<Contour::iterator, bool> ins =
3903 contour->insert(std::make_pair(name, named_object));
3906 // The name was already there.
3907 if (named_object->package() != NULL
3908 && ins.first->second->package() == named_object->package()
3909 && (ins.first->second->classification()
3910 == named_object->classification()))
3912 // This is a second import of the same object.
3913 return ins.first->second;
3915 ins.first->second = this->new_definition(ins.first->second,
3917 return ins.first->second;
3921 // Don't push declarations on the list. We push them on when
3922 // and if we find the definitions. That way we genericize the
3923 // functions in order.
3924 if (!named_object->is_type_declaration()
3925 && !named_object->is_function_declaration()
3926 && !named_object->is_unknown())
3927 this->named_objects_.push_back(named_object);
3928 return named_object;
3932 // We had an existing named object OLD_OBJECT, and we've seen a new
3933 // one NEW_OBJECT with the same name. FIXME: This does not free the
3934 // new object when we don't need it.
3937 Bindings::new_definition(Named_object* old_object, Named_object* new_object)
3940 switch (old_object->classification())
3943 case Named_object::NAMED_OBJECT_UNINITIALIZED:
3946 case Named_object::NAMED_OBJECT_UNKNOWN:
3948 Named_object* real = old_object->unknown_value()->real_named_object();
3950 return this->new_definition(real, new_object);
3951 gcc_assert(!new_object->is_unknown());
3952 old_object->unknown_value()->set_real_named_object(new_object);
3953 if (!new_object->is_type_declaration()
3954 && !new_object->is_function_declaration())
3955 this->named_objects_.push_back(new_object);
3959 case Named_object::NAMED_OBJECT_CONST:
3962 case Named_object::NAMED_OBJECT_TYPE:
3963 if (new_object->is_type_declaration())
3967 case Named_object::NAMED_OBJECT_TYPE_DECLARATION:
3968 if (new_object->is_type_declaration())
3970 if (new_object->is_type())
3972 old_object->set_type_value(new_object->type_value());
3973 new_object->type_value()->set_named_object(old_object);
3974 this->named_objects_.push_back(old_object);
3979 case Named_object::NAMED_OBJECT_VAR:
3980 case Named_object::NAMED_OBJECT_RESULT_VAR:
3983 case Named_object::NAMED_OBJECT_SINK:
3986 case Named_object::NAMED_OBJECT_FUNC:
3987 if (new_object->is_function_declaration())
3989 if (!new_object->func_declaration_value()->asm_name().empty())
3990 sorry("__asm__ for function definitions");
3991 Function_type* old_type = old_object->func_value()->type();
3992 Function_type* new_type =
3993 new_object->func_declaration_value()->type();
3994 if (old_type->is_valid_redeclaration(new_type, &reason))
3999 case Named_object::NAMED_OBJECT_FUNC_DECLARATION:
4001 Function_type* old_type = old_object->func_declaration_value()->type();
4002 if (new_object->is_function_declaration())
4004 Function_type* new_type =
4005 new_object->func_declaration_value()->type();
4006 if (old_type->is_valid_redeclaration(new_type, &reason))
4009 if (new_object->is_function())
4011 Function_type* new_type = new_object->func_value()->type();
4012 if (old_type->is_valid_redeclaration(new_type, &reason))
4014 if (!old_object->func_declaration_value()->asm_name().empty())
4015 sorry("__asm__ for function definitions");
4016 old_object->set_function_value(new_object->func_value());
4017 this->named_objects_.push_back(old_object);
4024 case Named_object::NAMED_OBJECT_PACKAGE:
4025 if (new_object->is_package()
4026 && (old_object->package_value()->name()
4027 == new_object->package_value()->name()))
4033 std::string n = old_object->message_name();
4035 error_at(new_object->location(), "redefinition of %qs", n.c_str());
4037 error_at(new_object->location(), "redefinition of %qs: %s", n.c_str(),
4040 inform(old_object->location(), "previous definition of %qs was here",
4046 // Add a named type.
4049 Bindings::add_named_type(Named_type* named_type)
4051 return this->add_named_object(named_type->named_object());
4057 Bindings::add_function(const std::string& name, const Package* package,
4060 return this->add_named_object(Named_object::make_function(name, package,
4064 // Add a function declaration.
4067 Bindings::add_function_declaration(const std::string& name,
4068 const Package* package,
4069 Function_type* type,
4070 source_location location)
4072 Named_object* no = Named_object::make_function_declaration(name, package,
4074 return this->add_named_object(no);
4077 // Define a type which was previously declared.
4080 Bindings::define_type(Named_object* no, Named_type* type)
4082 no->set_type_value(type);
4083 this->named_objects_.push_back(no);
4086 // Traverse bindings.
4089 Bindings::traverse(Traverse* traverse, bool is_global)
4091 unsigned int traverse_mask = traverse->traverse_mask();
4093 // We don't use an iterator because we permit the traversal to add
4094 // new global objects.
4095 for (size_t i = 0; i < this->named_objects_.size(); ++i)
4097 Named_object* p = this->named_objects_[i];
4098 switch (p->classification())
4100 case Named_object::NAMED_OBJECT_CONST:
4101 if ((traverse_mask & Traverse::traverse_constants) != 0)
4103 if (traverse->constant(p, is_global) == TRAVERSE_EXIT)
4104 return TRAVERSE_EXIT;
4106 if ((traverse_mask & Traverse::traverse_types) != 0
4107 || (traverse_mask & Traverse::traverse_expressions) != 0)
4109 Type* t = p->const_value()->type();
4111 && Type::traverse(t, traverse) == TRAVERSE_EXIT)
4112 return TRAVERSE_EXIT;
4114 if ((traverse_mask & Traverse::traverse_expressions) != 0)
4116 if (p->const_value()->traverse_expression(traverse)
4118 return TRAVERSE_EXIT;
4122 case Named_object::NAMED_OBJECT_VAR:
4123 case Named_object::NAMED_OBJECT_RESULT_VAR:
4124 if ((traverse_mask & Traverse::traverse_variables) != 0)
4126 if (traverse->variable(p) == TRAVERSE_EXIT)
4127 return TRAVERSE_EXIT;
4129 if (((traverse_mask & Traverse::traverse_types) != 0
4130 || (traverse_mask & Traverse::traverse_expressions) != 0)
4131 && (p->is_result_variable()
4132 || p->var_value()->has_type()))
4134 Type* t = (p->is_variable()
4135 ? p->var_value()->type()
4136 : p->result_var_value()->type());
4138 && Type::traverse(t, traverse) == TRAVERSE_EXIT)
4139 return TRAVERSE_EXIT;
4141 if (p->is_variable()
4142 && (traverse_mask & Traverse::traverse_expressions) != 0)
4144 if (p->var_value()->traverse_expression(traverse)
4146 return TRAVERSE_EXIT;
4150 case Named_object::NAMED_OBJECT_FUNC:
4151 if ((traverse_mask & Traverse::traverse_functions) != 0)
4153 int t = traverse->function(p);
4154 if (t == TRAVERSE_EXIT)
4155 return TRAVERSE_EXIT;
4156 else if (t == TRAVERSE_SKIP_COMPONENTS)
4161 & (Traverse::traverse_variables
4162 | Traverse::traverse_constants
4163 | Traverse::traverse_functions
4164 | Traverse::traverse_blocks
4165 | Traverse::traverse_statements
4166 | Traverse::traverse_expressions
4167 | Traverse::traverse_types)) != 0)
4169 if (p->func_value()->traverse(traverse) == TRAVERSE_EXIT)
4170 return TRAVERSE_EXIT;
4174 case Named_object::NAMED_OBJECT_PACKAGE:
4175 // These are traversed in Gogo::traverse.
4176 gcc_assert(is_global);
4179 case Named_object::NAMED_OBJECT_TYPE:
4180 if ((traverse_mask & Traverse::traverse_types) != 0
4181 || (traverse_mask & Traverse::traverse_expressions) != 0)
4183 if (Type::traverse(p->type_value(), traverse) == TRAVERSE_EXIT)
4184 return TRAVERSE_EXIT;
4188 case Named_object::NAMED_OBJECT_TYPE_DECLARATION:
4189 case Named_object::NAMED_OBJECT_FUNC_DECLARATION:
4190 case Named_object::NAMED_OBJECT_UNKNOWN:
4193 case Named_object::NAMED_OBJECT_SINK:
4199 return TRAVERSE_CONTINUE;
4204 Package::Package(const std::string& name, const std::string& unique_prefix,
4205 source_location location)
4206 : name_(name), unique_prefix_(unique_prefix), bindings_(new Bindings(NULL)),
4207 priority_(0), location_(location), used_(false), is_imported_(false),
4208 uses_sink_alias_(false)
4210 gcc_assert(!name.empty() && !unique_prefix.empty());
4213 // Set the priority. We may see multiple priorities for an imported
4214 // package; we want to use the largest one.
4217 Package::set_priority(int priority)
4219 if (priority > this->priority_)
4220 this->priority_ = priority;
4223 // Determine types of constants. Everything else in a package
4224 // (variables, function declarations) should already have a fixed
4225 // type. Constants may have abstract types.
4228 Package::determine_types()
4230 Bindings* bindings = this->bindings_;
4231 for (Bindings::const_definitions_iterator p = bindings->begin_definitions();
4232 p != bindings->end_definitions();
4235 if ((*p)->is_const())
4236 (*p)->const_value()->determine_type();
4244 Traverse::~Traverse()
4246 if (this->types_seen_ != NULL)
4247 delete this->types_seen_;
4248 if (this->expressions_seen_ != NULL)
4249 delete this->expressions_seen_;
4252 // Record that we are looking at a type, and return true if we have
4256 Traverse::remember_type(const Type* type)
4258 if (type->is_error_type())
4260 gcc_assert((this->traverse_mask() & traverse_types) != 0
4261 || (this->traverse_mask() & traverse_expressions) != 0);
4262 // We only have to remember named types, as they are the only ones
4263 // we can see multiple times in a traversal.
4264 if (type->classification() != Type::TYPE_NAMED)
4266 if (this->types_seen_ == NULL)
4267 this->types_seen_ = new Types_seen();
4268 std::pair<Types_seen::iterator, bool> ins = this->types_seen_->insert(type);
4272 // Record that we are looking at an expression, and return true if we
4273 // have already seen it.
4276 Traverse::remember_expression(const Expression* expression)
4278 gcc_assert((this->traverse_mask() & traverse_types) != 0
4279 || (this->traverse_mask() & traverse_expressions) != 0);
4280 if (this->expressions_seen_ == NULL)
4281 this->expressions_seen_ = new Expressions_seen();
4282 std::pair<Expressions_seen::iterator, bool> ins =
4283 this->expressions_seen_->insert(expression);
4287 // The default versions of these functions should never be called: the
4288 // traversal mask indicates which functions may be called.
4291 Traverse::variable(Named_object*)
4297 Traverse::constant(Named_object*, bool)
4303 Traverse::function(Named_object*)
4309 Traverse::block(Block*)
4315 Traverse::statement(Block*, size_t*, Statement*)
4321 Traverse::expression(Expression**)
4327 Traverse::type(Type*)