1 // gogo.h -- Go frontend parsed representation. -*- C++ -*-
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.
10 #include "go-linemap.h"
13 class Statement_inserter
;
15 class Type_hash_identical
;
18 class Typed_identifier
;
19 class Typed_identifier_list
;
22 class Expression_list
;
24 class Temporary_statement
;
28 class Bindings_snapshot
;
34 class Struct_field_list
;
40 class Forward_declaration_type
;
43 class Translate_context
;
57 // This file declares the basic classes used to hold the internal
58 // representation of Go which is built by the parser.
60 // An initialization function for an imported package. This is a
61 // magic function which initializes variables and runs the "init"
67 Import_init(const std::string
& package_name
, const std::string
& init_name
,
69 : package_name_(package_name
), init_name_(init_name
), priority_(priority
)
72 // The name of the package being imported.
75 { return this->package_name_
; }
77 // The name of the package's init function.
80 { return this->init_name_
; }
82 // Older V1 export data uses a priority scheme to order
83 // initialization functions; functions with a lower priority number
84 // must be run first. This value will be set to -1 for current
85 // generation objects, and will take on a non-negative value only
86 // when importing a V1-vintage object.
89 { return this->priority_
; }
93 set_priority(int new_priority
)
94 { this->priority_
= new_priority
; }
96 // Record the fact that some other init fcn must be run before this init fcn.
98 record_precursor_fcn(std::string init_fcn_name
)
99 { this->precursor_functions_
.insert(init_fcn_name
); }
101 // Return the list of precursor fcns for this fcn (must be run before it).
102 const std::set
<std::string
>&
104 { return this->precursor_functions_
; }
107 // The name of the package being imported.
108 std::string package_name_
;
109 // The name of the package's init function.
110 std::string init_name_
;
111 // Names of init functions that must be run before this fcn.
112 std::set
<std::string
> precursor_functions_
;
113 // Priority for this function. See note above on obsolescence.
117 // For sorting purposes.
119 struct Import_init_lt
{
120 bool operator()(const Import_init
* i1
, const Import_init
* i2
) const
122 return i1
->init_name() < i2
->init_name();
126 // Set of import init objects.
127 class Import_init_set
: public std::set
<Import_init
*, Import_init_lt
> {
131 priority_compare(const Import_init
* i1
, const Import_init
* i2
)
133 if (i1
->priority() < i2
->priority())
135 if (i1
->priority() > i2
->priority())
137 if (i1
->package_name() != i2
->package_name())
138 return i1
->package_name() < i2
->package_name();
139 return i1
->init_name() < i2
->init_name();
142 // The holder for the internal representation of the entire
148 // Create the IR, passing in the sizes of the types "int" and
149 // "uintptr" in bits.
150 Gogo(Backend
* backend
, Linemap
*linemap
, int int_type_size
, int pointer_size
);
152 // Get the backend generator.
155 { return this->backend_
; }
157 // Get the Location generator.
160 { return this->linemap_
; }
162 // Get the package name.
164 package_name() const;
166 // Set the package name.
168 set_package_name(const std::string
&, Location
);
170 // Return whether this is the "main" package.
172 is_main_package() const;
174 // If necessary, adjust the name to use for a hidden symbol. We add
175 // the package name, so that hidden symbols in different packages do
178 pack_hidden_name(const std::string
& name
, bool is_exported
) const
182 : '.' + this->pkgpath() + '.' + name
);
185 // Unpack a name which may have been hidden. Returns the
186 // user-visible name of the object.
188 unpack_hidden_name(const std::string
& name
)
189 { return name
[0] != '.' ? name
: name
.substr(name
.rfind('.') + 1); }
191 // Return whether a possibly packed name is hidden.
193 is_hidden_name(const std::string
& name
)
194 { return name
[0] == '.'; }
196 // Return the package path of a hidden name.
198 hidden_name_pkgpath(const std::string
& name
)
200 go_assert(Gogo::is_hidden_name(name
));
201 return name
.substr(1, name
.rfind('.') - 1);
204 // Given a name which may or may not have been hidden, return the
205 // name to use within a mangled symbol name.
207 mangle_possibly_hidden_name(const std::string
& name
)
209 // FIXME: This adds in pkgpath twice for hidden symbols, which is
212 if (!Gogo::is_hidden_name(name
))
217 std::string pkgpath
= Gogo::hidden_name_pkgpath(name
);
218 n
.append(Gogo::pkgpath_for_symbol(pkgpath
));
220 n
.append(Gogo::unpack_hidden_name(name
));
225 // Given a name which may or may not have been hidden, return the
226 // name to use in an error message.
228 message_name(const std::string
& name
);
230 // Return whether a name is the blank identifier _.
232 is_sink_name(const std::string
& name
)
234 return (name
[0] == '.'
235 && name
[name
.length() - 1] == '_'
236 && name
[name
.length() - 2] == '.');
239 // Convert a pkgpath into a string suitable for a symbol
241 pkgpath_for_symbol(const std::string
& pkgpath
);
243 // Return the package path to use for reflect.Type.PkgPath.
247 // Return the package path to use for a symbol name.
249 pkgpath_symbol() const;
251 // Set the package path from a command line option.
253 set_pkgpath(const std::string
&);
255 // Set the prefix from a command line option.
257 set_prefix(const std::string
&);
259 // Return whether pkgpath was set from a command line option.
261 pkgpath_from_option() const
262 { return this->pkgpath_from_option_
; }
264 // Return the relative import path as set from the command line.
265 // Returns an empty string if it was not set.
267 relative_import_path() const
268 { return this->relative_import_path_
; }
270 // Set the relative import path from a command line option.
272 set_relative_import_path(const std::string
& s
)
273 { this->relative_import_path_
= s
; }
275 // Set the C header file to write. This is used for the runtime
278 set_c_header(const std::string
& s
)
279 { this->c_header_
= s
; }
281 // Return whether to check for division by zero in binary operations.
283 check_divide_by_zero() const
284 { return this->check_divide_by_zero_
; }
286 // Set the option to check division by zero from a command line option.
288 set_check_divide_by_zero(bool b
)
289 { this->check_divide_by_zero_
= b
; }
291 // Return whether to check for division overflow in binary operations.
293 check_divide_overflow() const
294 { return this->check_divide_overflow_
; }
296 // Set the option to check division overflow from a command line option.
298 set_check_divide_overflow(bool b
)
299 { this->check_divide_overflow_
= b
; }
301 // Return whether we are compiling the runtime package.
303 compiling_runtime() const
304 { return this->compiling_runtime_
; }
306 // Set whether we are compiling the runtime package.
308 set_compiling_runtime(bool b
)
309 { this->compiling_runtime_
= b
; }
311 // Return the level of escape analysis debug information to emit.
313 debug_escape_level() const
314 { return this->debug_escape_level_
; }
316 // Set the level of escape analysis debugging from a command line option.
318 set_debug_escape_level(int level
)
319 { this->debug_escape_level_
= level
; }
321 // Return the hash for debug escape analysis.
323 debug_escape_hash() const
324 { return this->debug_escape_hash_
; }
326 // Set the hash value for debug escape analysis.
328 set_debug_escape_hash(const std::string
& s
)
329 { this->debug_escape_hash_
= s
; }
331 // Return the size threshold used to determine whether to issue
332 // a nil-check for a given pointer dereference. A threshold of -1
333 // implies that all potentially faulting dereference ops should
334 // be nil-checked. A positive threshold of N implies that a deref
335 // of *P where P has size less than N doesn't need a nil check.
337 nil_check_size_threshold() const
338 { return this->nil_check_size_threshold_
; }
340 // Set the nil-check size threshold, as described above.
342 set_nil_check_size_threshold(int64_t bytes
)
343 { this->nil_check_size_threshold_
= bytes
; }
345 // Import a package. FILENAME is the file name argument, LOCAL_NAME
346 // is the local name to give to the package. If LOCAL_NAME is empty
347 // the declarations are added to the global scope.
349 import_package(const std::string
& filename
, const std::string
& local_name
,
350 bool is_local_name_exported
, bool must_exist
, Location
);
352 // Whether we are the global binding level.
354 in_global_scope() const;
356 // Look up a name in the current binding contours.
358 lookup(const std::string
&, Named_object
** pfunction
) const;
360 // Look up a name in the current block.
362 lookup_in_block(const std::string
&) const;
364 // Look up a name in the global namespace--the universal scope.
366 lookup_global(const char*) const;
368 // Add a new imported package. REAL_NAME is the real name of the
369 // package. ALIAS is the alias of the package; this may be the same
370 // as REAL_NAME. This sets *PADD_TO_GLOBALS if symbols added to
371 // this package should be added to the global namespace; this is
372 // true if the alias is ".". LOCATION is the location of the import
373 // statement. This returns the new package, or NULL on error.
375 add_imported_package(const std::string
& real_name
, const std::string
& alias
,
376 bool is_alias_exported
,
377 const std::string
& pkgpath
,
378 const std::string
& pkgpath_symbol
,
380 bool* padd_to_globals
);
382 // Register a package. This package may or may not be imported.
383 // This returns the Package structure for the package, creating if
386 register_package(const std::string
& pkgpath
,
387 const std::string
& pkgpath_symbol
, Location
);
389 // Look up a package by pkgpath, and return its pkgpath_symbol.
391 pkgpath_symbol_for_package(const std::string
&);
393 // Start compiling a function. ADD_METHOD_TO_TYPE is true if a
394 // method function should be added to the type of its receiver.
396 start_function(const std::string
& name
, Function_type
* type
,
397 bool add_method_to_type
, Location
);
399 // Finish compiling a function.
401 finish_function(Location
);
403 // Return the current function.
405 current_function() const;
407 // Return the current block.
411 // Start a new block. This is not initially associated with a
414 start_block(Location
);
416 // Finish the current block and return it.
418 finish_block(Location
);
420 // Declare an erroneous name. This is used to avoid knock-on errors
421 // after a parsing error.
423 add_erroneous_name(const std::string
& name
);
425 // Declare an unknown name. This is used while parsing. The name
426 // must be resolved by the end of the parse. Unknown names are
427 // always added at the package level.
429 add_unknown_name(const std::string
& name
, Location
);
431 // Declare a function.
433 declare_function(const std::string
&, Function_type
*, Location
);
435 // Declare a function at the package level. This is used for
436 // functions generated for a type.
438 declare_package_function(const std::string
&, Function_type
*, Location
);
442 add_label_definition(const std::string
&, Location
);
444 // Add a label reference. ISSUE_GOTO_ERRORS is true if we should
445 // report errors for a goto from the current location to the label
448 add_label_reference(const std::string
&, Location
,
449 bool issue_goto_errors
);
451 // An analysis set is a list of functions paired with a boolean that indicates
452 // whether the list of functions are recursive.
453 typedef std::pair
<std::vector
<Named_object
*>, bool> Analysis_set
;
455 // Add a GROUP of possibly RECURSIVE functions to the Analysis_set for this
458 add_analysis_set(const std::vector
<Named_object
*>& group
, bool recursive
)
459 { this->analysis_sets_
.push_back(std::make_pair(group
, recursive
)); }
461 // Return a snapshot of the current binding state.
463 bindings_snapshot(Location
);
465 // Add a statement to the current block.
467 add_statement(Statement
*);
469 // Add a block to the current block.
471 add_block(Block
*, Location
);
475 add_constant(const Typed_identifier
&, Expression
*, int iota_value
);
479 add_type(const std::string
&, Type
*, Location
);
481 // Add a named type. This is used for builtin types, and to add an
482 // imported type to the global scope.
484 add_named_type(Named_type
*);
488 declare_type(const std::string
&, Location
);
490 // Declare a type at the package level. This is used when the
491 // parser sees an unknown name where a type name is required.
493 declare_package_type(const std::string
&, Location
);
495 // Define a type which was already declared.
497 define_type(Named_object
*, Named_type
*);
501 add_variable(const std::string
&, Variable
*);
503 // Add a sink--a reference to the blank identifier _.
507 // Add a type which needs to be verified. This is used for sink
508 // types, just to give appropriate error messages.
510 add_type_to_verify(Type
* type
);
512 // Add a named object to the current namespace. This is used for
513 // import . "package".
515 add_dot_import_object(Named_object
*);
517 // Add an identifier to the list of names seen in the file block.
519 add_file_block_name(const std::string
& name
, Location location
)
520 { this->file_block_names_
[name
] = location
; }
522 // Add a linkname, from the go:linkname compiler directive. This
523 // changes the externally visible name of go_name to be ext_name.
525 add_linkname(const std::string
& go_name
, bool is_exported
,
526 const std::string
& ext_name
, Location location
);
528 // Mark all local variables in current bindings as used. This is
529 // used when there is a parse error to avoid useless errors.
533 // Note that we've seen an interface type. This is used to build
534 // all required interface method tables.
536 record_interface_type(Interface_type
*);
538 // Note that we need an initialization function.
541 { this->need_init_fn_
= true; }
543 // Return whether the current file imported the unsafe package.
545 current_file_imported_unsafe() const
546 { return this->current_file_imported_unsafe_
; }
548 // Clear out all names in file scope. This is called when we start
549 // parsing a new file.
553 // Record that VAR1 must be initialized after VAR2. This is used
554 // when VAR2 does not appear in VAR1's INIT or PREINIT.
556 record_var_depends_on(Variable
* var1
, Named_object
* var2
)
558 go_assert(this->var_deps_
.find(var1
) == this->var_deps_
.end());
559 this->var_deps_
[var1
] = var2
;
562 // Return the variable that VAR depends on, or NULL if none.
564 var_depends_on(Variable
* var
) const
566 Var_deps::const_iterator p
= this->var_deps_
.find(var
);
567 return p
!= this->var_deps_
.end() ? p
->second
: NULL
;
570 // Queue up a type-specific function to be written out. This is
571 // used when a type-specific function is needed when not at the top
574 queue_specific_type_function(Type
* type
, Named_type
* name
, int64_t size
,
575 const std::string
& hash_name
,
576 Function_type
* hash_fntype
,
577 const std::string
& equal_name
,
578 Function_type
* equal_fntype
);
580 // Write out queued specific type functions.
582 write_specific_type_functions();
584 // Whether we are done writing out specific type functions.
586 specific_type_functions_are_written() const
587 { return this->specific_type_functions_are_written_
; }
589 // Add a pointer that needs to be added to the list of objects
590 // traversed by the garbage collector. This should be an expression
591 // of pointer type that points to static storage. It's not
592 // necessary to add global variables to this list, just global
593 // variable initializers that would otherwise not be seen.
595 add_gc_root(Expression
* expr
)
597 this->set_need_init_fn();
598 this->gc_roots_
.push_back(expr
);
601 // Traverse the tree. See the Traverse class.
605 // Define the predeclared global names.
607 define_global_names();
609 // Verify and complete all types.
613 // Lower the parse tree.
617 // Lower all the statements in a block.
619 lower_block(Named_object
* function
, Block
*);
621 // Lower an expression.
623 lower_expression(Named_object
* function
, Statement_inserter
*, Expression
**);
627 lower_constant(Named_object
*);
629 // Flatten all the statements in a block.
631 flatten_block(Named_object
* function
, Block
*);
633 // Flatten an expression.
635 flatten_expression(Named_object
* function
, Statement_inserter
*, Expression
**);
637 // Create all necessary function descriptors.
639 create_function_descriptors();
641 // Finalize the method lists and build stub methods for named types.
645 // Work out the types to use for unspecified variables and
650 // Type check the program.
654 // Check the types in a single block. This is used for complicated
657 check_types_in_block(Block
*);
659 // Check for return statements.
661 check_return_statements();
663 // Analyze the program flow for escape information.
667 // Discover the groups of possibly recursive functions in this package.
669 discover_analysis_sets();
671 // Build a connectivity graph between the objects in each analyzed function.
673 assign_connectivity(Escape_context
*, Named_object
*);
675 // Traverse the objects in the connecitivty graph from the sink, adjusting the
676 // escape levels of each object.
678 propagate_escape(Escape_context
*, Node
*);
680 // Add notes about the escape level of a function's input and output
681 // parameters for exporting and importing top level functions.
683 tag_function(Escape_context
*, Named_object
*);
685 // Reclaim memory of escape analysis Nodes.
687 reclaim_escape_nodes();
693 // Add an import control function for an imported package to the
696 add_import_init_fn(const std::string
& package_name
,
697 const std::string
& init_name
, int prio
);
699 // Return the Import_init for a given init name.
701 lookup_init(const std::string
& init_name
);
703 // Turn short-cut operators (&&, ||) into explicit if statements.
707 // Use temporary variables to force order of evaluation.
711 // Add write barriers as needed.
713 add_write_barriers();
715 // Return whether an assignment that sets LHS to RHS needs a write
718 assign_needs_write_barrier(Expression
* lhs
);
720 // Return an assignment that sets LHS to RHS using a write barrier.
721 // This returns an if statement that checks whether write barriers
722 // are enabled. If not, it does LHS = RHS, otherwise it calls the
723 // appropriate write barrier function.
725 assign_with_write_barrier(Function
*, Block
*, Statement_inserter
*,
726 Expression
* lhs
, Expression
* rhs
, Location
);
728 // Flatten parse tree.
732 // Build thunks for functions which call recover.
734 build_recover_thunks();
736 // Return a declaration for __builtin_return_address or
737 // __builtin_frame_address.
739 declare_builtin_rf_address(const char* name
);
741 // Simplify statements which might use thunks: go and defer
744 simplify_thunk_statements();
746 // Dump AST if -fgo-dump-ast is set
748 dump_ast(const char* basename
);
750 // Dump Call Graph if -fgo-dump-calls is set.
752 dump_call_graph(const char* basename
);
754 // Dump Connection Graphs if -fgo-dump-connections is set.
756 dump_connection_graphs(const char* basename
);
758 // Convert named types to the backend representation.
760 convert_named_types();
762 // Convert named types in a list of bindings.
764 convert_named_types_in_bindings(Bindings
*);
766 // True if named types have been converted to the backend
769 named_types_are_converted() const
770 { return this->named_types_are_converted_
; }
772 // Give an error if the initialization of VAR depends on itself.
774 check_self_dep(Named_object
*);
776 // Write out the global values.
780 // Build a call to the runtime error function.
782 runtime_error(int code
, Location
);
784 // Build required interface method tables.
786 build_interface_method_tables();
788 // Return an expression which allocates memory to hold values of type TYPE.
790 allocate_memory(Type
*type
, Location
);
792 // Return the assembler name to use for an exported function, a
793 // method, or a function/method declaration.
795 function_asm_name(const std::string
& go_name
, const Package
*,
796 const Type
* receiver
);
798 // Return the name to use for a function descriptor.
800 function_descriptor_name(Named_object
*);
802 // Return the name to use for a generated stub method.
804 stub_method_name(const std::string
& method_name
);
806 // Return the names of the hash and equality functions for TYPE.
808 specific_type_function_names(const Type
*, const Named_type
*,
809 std::string
* hash_name
,
810 std::string
* equal_name
);
812 // Return the assembler name to use for a global variable.
814 global_var_asm_name(const std::string
& go_name
, const Package
*);
816 // Return a name to use for an error case. This should only be used
817 // after reporting an error, and is used to avoid useless knockon
822 // Return whether the name indicates an error.
824 is_erroneous_name(const std::string
&);
826 // Return a name to use for a thunk function. A thunk function is
827 // one we create during the compilation, for a go statement or a
828 // defer statement or a method expression.
832 // Return whether an object is a thunk.
834 is_thunk(const Named_object
*);
836 // Return the name to use for an init function.
838 init_function_name();
840 // Return the name to use for a nested function.
842 nested_function_name();
844 // Return the name to use for a sink funciton.
846 sink_function_name();
848 // Return the name to use for an (erroneous) redefined function.
850 redefined_function_name();
852 // Return the name for use for a recover thunk.
854 recover_thunk_name(const std::string
& name
, const Type
* rtype
);
856 // Return the name to use for the GC root variable.
860 // Return the name to use for a composite literal or string
865 // Return the name of the variable used to represent the zero value
868 map_zero_value_name();
870 // Get the name of the magic initialization function.
874 // Return the name for a type descriptor symbol.
876 type_descriptor_name(Type
*, Named_type
*);
878 // Return the assembler name for the GC symbol for a type.
880 gc_symbol_name(Type
*);
882 // Return the assembler name for a ptrmask variable.
884 ptrmask_symbol_name(const std::string
& ptrmask_sym_name
);
886 // Return the name to use for an interface method table.
888 interface_method_table_name(Interface_type
*, Type
*, bool is_pointer
);
891 // During parsing, we keep a stack of functions. Each function on
892 // the stack is one that we are currently parsing. For each
893 // function, we keep track of the current stack of blocks.
897 Named_object
* function
;
898 // The stack of active blocks in the function.
899 std::vector
<Block
*> blocks
;
902 // The stack of functions.
903 typedef std::vector
<Open_function
> Open_functions
;
905 // Set up the built-in unsafe package.
907 import_unsafe(const std::string
&, bool is_exported
, Location
);
909 // Return the current binding contour.
914 current_bindings() const;
919 // Get the decl for the magic initialization function.
921 initialization_function_decl();
923 // Create the magic initialization function.
925 create_initialization_function(Named_object
* fndecl
, Bstatement
* code_stmt
);
927 // Initialize imported packages. BFUNCTION is the function
928 // into which the package init calls will be placed.
930 init_imports(std::vector
<Bstatement
*>&, Bfunction
* bfunction
);
932 // Register variables with the garbage collector.
934 register_gc_vars(const std::vector
<Named_object
*>&,
935 std::vector
<Bstatement
*>&,
936 Bfunction
* init_bfunction
);
939 write_barrier_variable();
942 check_write_barrier(Block
*, Statement
*, Statement
*);
944 // Type used to map import names to packages.
945 typedef std::map
<std::string
, Package
*> Imports
;
947 // Type used to map package names to packages.
948 typedef std::map
<std::string
, Package
*> Packages
;
950 // Type used to map variables to the function calls that set them.
951 // This is used for initialization dependency analysis.
952 typedef std::map
<Variable
*, Named_object
*> Var_deps
;
954 // Type used to map identifiers in the file block to the location
955 // where they were defined.
956 typedef Unordered_map(std::string
, Location
) File_block_names
;
958 // Type used to queue writing a type specific function.
959 struct Specific_type_function
964 std::string hash_name
;
965 Function_type
* hash_fntype
;
966 std::string equal_name
;
967 Function_type
* equal_fntype
;
969 Specific_type_function(Type
* atype
, Named_type
* aname
, int64_t asize
,
970 const std::string
& ahash_name
,
971 Function_type
* ahash_fntype
,
972 const std::string
& aequal_name
,
973 Function_type
* aequal_fntype
)
974 : type(atype
), name(aname
), size(asize
), hash_name(ahash_name
),
975 hash_fntype(ahash_fntype
), equal_name(aequal_name
),
976 equal_fntype(aequal_fntype
)
980 // Recompute init priorities.
982 recompute_init_priorities();
984 // Recursive helper used by the routine above.
986 update_init_priority(Import_init
* ii
,
987 std::set
<const Import_init
*>* visited
);
989 // The backend generator.
991 // The object used to keep track of file names and line numbers.
993 // The package we are compiling.
995 // The list of currently open functions during parsing.
996 Open_functions functions_
;
997 // The global binding contour. This includes the builtin functions
998 // and the package we are compiling.
1000 // The list of names we have seen in the file block.
1001 File_block_names file_block_names_
;
1002 // Mapping from import file names to packages.
1004 // Whether the magic unsafe package was imported.
1005 bool imported_unsafe_
;
1006 // Whether the magic unsafe package was imported by the current file.
1007 bool current_file_imported_unsafe_
;
1008 // Mapping from package names we have seen to packages. This does
1009 // not include the package we are compiling.
1011 // The functions named "init", if there are any.
1012 std::vector
<Named_object
*> init_functions_
;
1013 // A mapping from variables to the function calls that initialize
1014 // them, if it is not stored in the variable's init or preinit.
1015 // This is used for dependency analysis.
1017 // Whether we need a magic initialization function.
1019 // The name of the magic initialization function.
1020 std::string init_fn_name_
;
1021 // A list of import control variables for packages that we import.
1022 Import_init_set imported_init_fns_
;
1023 // The package path used for reflection data.
1024 std::string pkgpath_
;
1025 // The package path to use for a symbol name.
1026 std::string pkgpath_symbol_
;
1027 // The prefix to use for symbols, from the -fgo-prefix option.
1028 std::string prefix_
;
1029 // Whether pkgpath_ has been set.
1031 // Whether an explicit package path was set by -fgo-pkgpath.
1032 bool pkgpath_from_option_
;
1033 // Whether an explicit prefix was set by -fgo-prefix.
1034 bool prefix_from_option_
;
1035 // The relative import path, from the -fgo-relative-import-path
1037 std::string relative_import_path_
;
1038 // The C header file to write, from the -fgo-c-header option.
1039 std::string c_header_
;
1040 // Whether or not to check for division by zero, from the
1041 // -fgo-check-divide-zero option.
1042 bool check_divide_by_zero_
;
1043 // Whether or not to check for division overflow, from the
1044 // -fgo-check-divide-overflow option.
1045 bool check_divide_overflow_
;
1046 // Whether we are compiling the runtime package, from the
1047 // -fgo-compiling-runtime option.
1048 bool compiling_runtime_
;
1049 // The level of escape analysis debug information to emit, from the
1050 // -fgo-debug-escape option.
1051 int debug_escape_level_
;
1052 // A hash value for debug escape analysis, from the
1053 // -fgo-debug-escape-hash option. The analysis is run only on
1054 // functions with names that hash to the matching value.
1055 std::string debug_escape_hash_
;
1056 // Nil-check size threshhold.
1057 int64_t nil_check_size_threshold_
;
1058 // A list of types to verify.
1059 std::vector
<Type
*> verify_types_
;
1060 // A list of interface types defined while parsing.
1061 std::vector
<Interface_type
*> interface_types_
;
1062 // Type specific functions to write out.
1063 std::vector
<Specific_type_function
*> specific_type_functions_
;
1064 // Whether we are done writing out specific type functions.
1065 bool specific_type_functions_are_written_
;
1066 // Whether named types have been converted.
1067 bool named_types_are_converted_
;
1068 // A list containing groups of possibly mutually recursive functions to be
1069 // considered during escape analysis.
1070 std::vector
<Analysis_set
> analysis_sets_
;
1071 // A list of objects to add to the GC roots.
1072 std::vector
<Expression
*> gc_roots_
;
1075 // A block of statements.
1080 Block(Block
* enclosing
, Location
);
1082 // Return the enclosing block.
1085 { return this->enclosing_
; }
1087 // Return the bindings of the block.
1090 { return this->bindings_
; }
1094 { return this->bindings_
; }
1096 // Look at the block's statements.
1097 const std::vector
<Statement
*>*
1099 { return &this->statements_
; }
1101 // Return the start location. This is normally the location of the
1102 // left curly brace which starts the block.
1104 start_location() const
1105 { return this->start_location_
; }
1107 // Return the end location. This is normally the location of the
1108 // right curly brace which ends the block.
1110 end_location() const
1111 { return this->end_location_
; }
1113 // Add a statement to the block.
1115 add_statement(Statement
*);
1117 // Add a statement to the front of the block.
1119 add_statement_at_front(Statement
*);
1121 // Replace a statement in a block.
1123 replace_statement(size_t index
, Statement
*);
1125 // Add a Statement before statement number INDEX.
1127 insert_statement_before(size_t index
, Statement
*);
1129 // Add a Statement after statement number INDEX.
1131 insert_statement_after(size_t index
, Statement
*);
1133 // Set the end location of the block.
1135 set_end_location(Location location
)
1136 { this->end_location_
= location
; }
1138 // Traverse the tree.
1140 traverse(Traverse
*);
1142 // Set final types for unspecified variables and constants.
1146 // Return true if execution of this block may fall through to the
1149 may_fall_through() const;
1151 // Convert the block to the backend representation.
1153 get_backend(Translate_context
*);
1155 // Iterate over statements.
1157 typedef std::vector
<Statement
*>::iterator iterator
;
1161 { return this->statements_
.begin(); }
1165 { return this->statements_
.end(); }
1170 // Statements in the block.
1171 std::vector
<Statement
*> statements_
;
1173 Bindings
* bindings_
;
1174 // Location of start of block.
1175 Location start_location_
;
1176 // Location of end of block.
1177 Location end_location_
;
1185 Function(Function_type
* type
, Named_object
*, Block
*, Location
);
1187 // Return the function's type.
1190 { return this->type_
; }
1192 // Return the enclosing function if there is one.
1195 { return this->enclosing_
; }
1197 // Set the enclosing function. This is used when building thunks
1198 // for functions which call recover.
1200 set_enclosing(Named_object
* enclosing
)
1202 go_assert(this->enclosing_
== NULL
);
1203 this->enclosing_
= enclosing
;
1206 // The result variables.
1207 typedef std::vector
<Named_object
*> Results
;
1209 // Create the result variables in the outer block.
1211 create_result_variables(Gogo
*);
1213 // Update the named result variables when cloning a function which
1216 update_result_variables();
1218 // Return the result variables.
1221 { return this->results_
; }
1225 { return this->is_sink_
; }
1229 { this->is_sink_
= true; }
1231 // Whether the result variables have names.
1233 results_are_named() const
1234 { return this->results_are_named_
; }
1236 // Set the assembler name.
1238 set_asm_name(const std::string
& asm_name
)
1239 { this->asm_name_
= asm_name
; }
1241 // Return the pragmas for this function.
1244 { return this->pragmas_
; }
1246 // Set the pragmas for this function.
1248 set_pragmas(unsigned int pragmas
)
1250 this->pragmas_
= pragmas
;
1253 // Whether this method should not be included in the type
1256 nointerface() const;
1258 // Record that this method should not be included in the type
1263 // Record that this function is a stub method created for an unnamed
1266 set_is_unnamed_type_stub_method()
1268 go_assert(this->is_method());
1269 this->is_unnamed_type_stub_method_
= true;
1272 // Return the amount of enclosed variables in this closure.
1274 closure_field_count() const
1275 { return this->closure_fields_
.size(); }
1277 // Add a new field to the closure variable.
1279 add_closure_field(Named_object
* var
, Location loc
)
1280 { this->closure_fields_
.push_back(std::make_pair(var
, loc
)); }
1282 // Whether this function needs a closure.
1284 needs_closure() const
1285 { return !this->closure_fields_
.empty(); }
1287 // Return the closure variable, creating it if necessary. This is
1288 // passed to the function as a static chain parameter.
1292 // Set the closure variable. This is used when building thunks for
1293 // functions which call recover.
1295 set_closure_var(Named_object
* v
)
1297 go_assert(this->closure_var_
== NULL
);
1298 this->closure_var_
= v
;
1301 // Return the variable for a reference to field INDEX in the closure
1304 enclosing_var(unsigned int index
)
1306 go_assert(index
< this->closure_fields_
.size());
1307 return closure_fields_
[index
].first
;
1310 // Set the type of the closure variable if there is one.
1314 // Get the block of statements associated with the function.
1317 { return this->block_
; }
1319 // Get the location of the start of the function.
1322 { return this->location_
; }
1324 // Return whether this function is actually a method.
1328 // Add a label definition to the function.
1330 add_label_definition(Gogo
*, const std::string
& label_name
, Location
);
1332 // Add a label reference to a function. ISSUE_GOTO_ERRORS is true
1333 // if we should report errors for a goto from the current location
1334 // to the label location.
1336 add_label_reference(Gogo
*, const std::string
& label_name
,
1337 Location
, bool issue_goto_errors
);
1339 // Warn about labels that are defined but not used.
1341 check_labels() const;
1343 // Note that a new local type has been added. Return its index.
1345 new_local_type_index()
1346 { return this->local_type_count_
++; }
1348 // Whether this function calls the predeclared recover function.
1350 calls_recover() const
1351 { return this->calls_recover_
; }
1353 // Record that this function calls the predeclared recover function.
1354 // This is set during the lowering pass.
1357 { this->calls_recover_
= true; }
1359 // Whether this is a recover thunk function.
1361 is_recover_thunk() const
1362 { return this->is_recover_thunk_
; }
1364 // Record that this is a thunk built for a function which calls
1367 set_is_recover_thunk()
1368 { this->is_recover_thunk_
= true; }
1370 // Whether this function already has a recover thunk.
1372 has_recover_thunk() const
1373 { return this->has_recover_thunk_
; }
1375 // Record that this function already has a recover thunk.
1377 set_has_recover_thunk()
1378 { this->has_recover_thunk_
= true; }
1380 // Record that this function is a thunk created for a defer
1381 // statement that calls the __go_set_defer_retaddr runtime function.
1383 set_calls_defer_retaddr()
1384 { this->calls_defer_retaddr_
= true; }
1386 // Whether this is a type hash or equality function created by the
1389 is_type_specific_function()
1390 { return this->is_type_specific_function_
; }
1392 // Record that this function is a type hash or equality function
1393 // created by the compiler.
1395 set_is_type_specific_function()
1396 { this->is_type_specific_function_
= true; }
1398 // Mark the function as going into a unique section.
1400 set_in_unique_section()
1401 { this->in_unique_section_
= true; }
1403 // Swap with another function. Used only for the thunk which calls
1406 swap_for_recover(Function
*);
1408 // Traverse the tree.
1410 traverse(Traverse
*);
1412 // Determine types in the function.
1416 // Return an expression for the function descriptor, given the named
1417 // object for this function. This may only be called for functions
1418 // without a closure. This will be an immutable struct with one
1419 // field that points to the function's code.
1421 descriptor(Gogo
*, Named_object
*);
1423 // Set the descriptor for this function. This is used when a
1424 // function declaration is followed by a function definition.
1426 set_descriptor(Expression
* descriptor
)
1428 go_assert(this->descriptor_
== NULL
);
1429 this->descriptor_
= descriptor
;
1432 // Return the backend representation.
1434 get_or_make_decl(Gogo
*, Named_object
*);
1436 // Return the function's decl after it has been built.
1440 // Set the function decl to hold a backend representation of the function
1443 build(Gogo
*, Named_object
*);
1445 // Get the statement that assigns values to this function's result struct.
1447 return_value(Gogo
*, Named_object
*, Location
) const;
1449 // Get an expression for the variable holding the defer stack.
1451 defer_stack(Location
);
1453 // Export the function.
1455 export_func(Export
*, const std::string
& name
) const;
1457 // Export a function with a type.
1459 export_func_with_type(Export
*, const std::string
& name
,
1460 const Function_type
*);
1462 // Import a function.
1464 import_func(Import
*, std::string
* pname
, Typed_identifier
** receiver
,
1465 Typed_identifier_list
** pparameters
,
1466 Typed_identifier_list
** presults
, bool* is_varargs
);
1469 // Type for mapping from label names to Label objects.
1470 typedef Unordered_map(std::string
, Label
*) Labels
;
1473 build_defer_wrapper(Gogo
*, Named_object
*, Bstatement
**, Bstatement
**);
1475 typedef std::vector
<std::pair
<Named_object
*,
1476 Location
> > Closure_fields
;
1478 // The function's type.
1479 Function_type
* type_
;
1480 // The enclosing function. This is NULL when there isn't one, which
1481 // is the normal case.
1482 Named_object
* enclosing_
;
1483 // The result variables, if any.
1485 // If there is a closure, this is the list of variables which appear
1486 // in the closure. This is created by the parser, and then resolved
1487 // to a real type when we lower parse trees.
1488 Closure_fields closure_fields_
;
1489 // The closure variable, passed as a parameter using the static
1490 // chain parameter. Normally NULL.
1491 Named_object
* closure_var_
;
1492 // The outer block of statements in the function.
1494 // The source location of the start of the function.
1496 // Labels defined or referenced in the function.
1498 // The number of local types defined in this function.
1499 unsigned int local_type_count_
;
1500 // The assembler name: this is the name that will be put in the object file.
1501 // Set by the go:linkname compiler directive. This is normally empty.
1502 std::string asm_name_
;
1503 // The function descriptor, if any.
1504 Expression
* descriptor_
;
1505 // The function decl.
1507 // The defer stack variable. A pointer to this variable is used to
1508 // distinguish the defer stack for one function from another. This
1509 // is NULL unless we actually need a defer stack.
1510 Temporary_statement
* defer_stack_
;
1511 // Pragmas for this function. This is a set of GOPRAGMA bits.
1512 unsigned int pragmas_
;
1513 // True if this function is sink-named. No code is generated.
1515 // True if the result variables are named.
1516 bool results_are_named_
: 1;
1517 // True if this function is a stub method created for an unnamed
1519 bool is_unnamed_type_stub_method_
: 1;
1520 // True if this function calls the predeclared recover function.
1521 bool calls_recover_
: 1;
1522 // True if this a thunk built for a function which calls recover.
1523 bool is_recover_thunk_
: 1;
1524 // True if this function already has a recover thunk.
1525 bool has_recover_thunk_
: 1;
1526 // True if this is a thunk built for a defer statement that calls
1527 // the __go_set_defer_retaddr runtime function.
1528 bool calls_defer_retaddr_
: 1;
1529 // True if this is a function built by the compiler to as a hash or
1530 // equality function for some type.
1531 bool is_type_specific_function_
: 1;
1532 // True if this function should be put in a unique section. This is
1533 // turned on for field tracking.
1534 bool in_unique_section_
: 1;
1537 // A snapshot of the current binding state.
1539 class Bindings_snapshot
1542 Bindings_snapshot(const Block
*, Location
);
1544 // Report any errors appropriate for a goto from the current binding
1545 // state of B to this one.
1547 check_goto_from(const Block
* b
, Location
);
1549 // Report any errors appropriate for a goto from this binding state
1550 // to the current state of B.
1552 check_goto_to(const Block
* b
);
1556 check_goto_block(Location
, const Block
*, const Block
*, size_t*);
1559 check_goto_defs(Location
, const Block
*, size_t, size_t);
1561 // The current block.
1562 const Block
* block_
;
1563 // The number of names currently defined in each open block.
1564 // Element 0 is this->block_, element 1 is
1565 // this->block_->enclosing(), etc.
1566 std::vector
<size_t> counts_
;
1567 // The location where this snapshot was taken.
1571 // A function declaration.
1573 class Function_declaration
1576 Function_declaration(Function_type
* fntype
, Location location
)
1577 : fntype_(fntype
), location_(location
), asm_name_(), descriptor_(NULL
),
1578 fndecl_(NULL
), pragmas_(0)
1583 { return this->fntype_
; }
1587 { return this->location_
; }
1591 { return this->asm_name_
; }
1593 // Set the assembler name.
1595 set_asm_name(const std::string
& asm_name
)
1596 { this->asm_name_
= asm_name
; }
1598 // Return the pragmas for this function.
1601 { return this->pragmas_
; }
1603 // Set the pragmas for this function.
1605 set_pragmas(unsigned int pragmas
)
1607 this->pragmas_
= pragmas
;
1610 // Return an expression for the function descriptor, given the named
1611 // object for this function. This may only be called for functions
1612 // without a closure. This will be an immutable struct with one
1613 // field that points to the function's code.
1615 descriptor(Gogo
*, Named_object
*);
1617 // Return true if we have created a descriptor for this declaration.
1619 has_descriptor() const
1620 { return this->descriptor_
!= NULL
; }
1622 // Return a backend representation.
1624 get_or_make_decl(Gogo
*, Named_object
*);
1626 // If there is a descriptor, build it into the backend
1629 build_backend_descriptor(Gogo
*);
1631 // Export a function declaration.
1633 export_func(Export
* exp
, const std::string
& name
) const
1634 { Function::export_func_with_type(exp
, name
, this->fntype_
); }
1636 // Check that the types used in this declaration's signature are defined.
1638 check_types() const;
1641 // The type of the function.
1642 Function_type
* fntype_
;
1643 // The location of the declaration.
1645 // The assembler name: this is the name to use in references to the
1646 // function. This is normally empty.
1647 std::string asm_name_
;
1648 // The function descriptor, if any.
1649 Expression
* descriptor_
;
1650 // The function decl if needed.
1652 // Pragmas for this function. This is a set of GOPRAGMA bits.
1653 unsigned int pragmas_
;
1661 Variable(Type
*, Expression
*, bool is_global
, bool is_parameter
,
1662 bool is_receiver
, Location
);
1664 // Get the type of the variable.
1671 // Return whether the type is defined yet.
1675 // Get the initial value.
1678 { return this->init_
; }
1680 // Return whether there are any preinit statements.
1682 has_pre_init() const
1683 { return this->preinit_
!= NULL
; }
1685 // Return the preinit statements if any.
1688 { return this->preinit_
; }
1690 // Return whether this is a global variable.
1693 { return this->is_global_
; }
1695 // Return whether this is a function parameter.
1697 is_parameter() const
1698 { return this->is_parameter_
; }
1700 // Return whether this is a closure (static chain) parameter.
1703 { return this->is_closure_
; }
1705 // Change this parameter to be a closure.
1709 this->is_closure_
= true;
1712 // Return whether this is the receiver parameter of a method.
1715 { return this->is_receiver_
; }
1717 // Change this parameter to be a receiver. This is used when
1718 // creating the thunks created for functions which call recover.
1722 go_assert(this->is_parameter_
);
1723 this->is_receiver_
= true;
1726 // Change this parameter to not be a receiver. This is used when
1727 // creating the thunks created for functions which call recover.
1729 set_is_not_receiver()
1731 go_assert(this->is_parameter_
);
1732 this->is_receiver_
= false;
1735 // Return whether this is the varargs parameter of a function.
1737 is_varargs_parameter() const
1738 { return this->is_varargs_parameter_
; }
1740 // Whether this variable's address is taken.
1742 is_address_taken() const
1743 { return this->is_address_taken_
; }
1745 // Whether this variable should live in the heap.
1749 return this->is_address_taken_
1751 && !this->is_global_
;
1754 // Note that something takes the address of this variable.
1757 { this->is_address_taken_
= true; }
1759 // Return whether the address is taken but does not escape.
1761 is_non_escaping_address_taken() const
1762 { return this->is_non_escaping_address_taken_
; }
1764 // Note that something takes the address of this variable such that
1765 // the address does not escape the function.
1767 set_non_escaping_address_taken()
1768 { this->is_non_escaping_address_taken_
= true; }
1770 // Return whether this variable escapes the function it is declared in.
1773 { return this->escapes_
; }
1775 // Note that this variable does not escape the function it is declared in.
1777 set_does_not_escape()
1778 { this->escapes_
= false; }
1780 // Get the source location of the variable's declaration.
1783 { return this->location_
; }
1785 // Record that this is the varargs parameter of a function.
1787 set_is_varargs_parameter()
1789 go_assert(this->is_parameter_
);
1790 this->is_varargs_parameter_
= true;
1793 // Return whether the variable has been used.
1796 { return this->is_used_
; }
1798 // Mark that the variable has been used.
1801 { this->is_used_
= true; }
1803 // Clear the initial value; used for error handling and write barriers.
1806 { this->init_
= NULL
; }
1808 // Set the initial value; used for converting shortcuts.
1810 set_init(Expression
* init
)
1811 { this->init_
= init
; }
1813 // Get the preinit block, a block of statements to be run before the
1814 // initialization expression.
1816 preinit_block(Gogo
*);
1818 // Add a statement to be run before the initialization expression.
1819 // This is only used for global variables.
1821 add_preinit_statement(Gogo
*, Statement
*);
1823 // Lower the initialization expression after parsing is complete.
1825 lower_init_expression(Gogo
*, Named_object
*, Statement_inserter
*);
1827 // Flatten the initialization expression after ordering evaluations.
1829 flatten_init_expression(Gogo
*, Named_object
*, Statement_inserter
*);
1831 // A special case: the init value is used only to determine the
1832 // type. This is used if the variable is defined using := with the
1833 // comma-ok form of a map index or a receive expression. The init
1834 // value is actually the map index expression or receive expression.
1835 // We use this because we may not know the right type at parse time.
1837 set_type_from_init_tuple()
1838 { this->type_from_init_tuple_
= true; }
1840 // Another special case: the init value is used only to determine
1841 // the type. This is used if the variable is defined using := with
1842 // a range clause. The init value is the range expression. The
1843 // type of the variable is the index type of the range expression
1844 // (i.e., the first value returned by a range).
1846 set_type_from_range_index()
1847 { this->type_from_range_index_
= true; }
1849 // Another special case: like set_type_from_range_index, but the
1850 // type is the value type of the range expression (i.e., the second
1851 // value returned by a range).
1853 set_type_from_range_value()
1854 { this->type_from_range_value_
= true; }
1856 // Another special case: the init value is used only to determine
1857 // the type. This is used if the variable is defined using := with
1858 // a case in a select statement. The init value is the channel.
1859 // The type of the variable is the channel's element type.
1861 set_type_from_chan_element()
1862 { this->type_from_chan_element_
= true; }
1864 // After we lower the select statement, we once again set the type
1865 // from the initialization expression.
1867 clear_type_from_chan_element()
1869 go_assert(this->type_from_chan_element_
);
1870 this->type_from_chan_element_
= false;
1873 // TRUE if this variable was created for a type switch clause.
1875 is_type_switch_var() const
1876 { return this->is_type_switch_var_
; }
1878 // Note that this variable was created for a type switch clause.
1880 set_is_type_switch_var()
1881 { this->is_type_switch_var_
= true; }
1883 // Mark the variable as going into a unique section.
1885 set_in_unique_section()
1887 go_assert(this->is_global_
);
1888 this->in_unique_section_
= true;
1891 // Return the top-level declaration for this variable.
1894 { return this->toplevel_decl_
; }
1896 // Set the top-level declaration for this variable. Only used for local
1899 set_toplevel_decl(Statement
* s
)
1901 go_assert(!this->is_global_
&& !this->is_parameter_
&& !this->is_receiver_
);
1902 this->toplevel_decl_
= s
;
1905 // Traverse the initializer expression.
1907 traverse_expression(Traverse
*, unsigned int traverse_mask
);
1909 // Determine the type of the variable if necessary.
1913 // Get the backend representation of the variable.
1915 get_backend_variable(Gogo
*, Named_object
*, const Package
*,
1916 const std::string
&);
1918 // Get the initial value of the variable. This may only
1919 // be called if has_pre_init() returns false.
1921 get_init(Gogo
*, Named_object
* function
);
1923 // Return a series of statements which sets the value of the
1924 // variable in DECL. This should only be called is has_pre_init()
1925 // returns true. DECL may be NULL for a sink variable.
1927 get_init_block(Gogo
*, Named_object
* function
, Bvariable
* decl
);
1929 // Export the variable.
1931 export_var(Export
*, const std::string
& name
) const;
1933 // Import a variable.
1935 import_var(Import
*, std::string
* pname
, Type
** ptype
);
1938 // The type of a tuple.
1940 type_from_tuple(Expression
*, bool) const;
1942 // The type of a range.
1944 type_from_range(Expression
*, bool, bool) const;
1946 // The element type of a channel.
1948 type_from_chan_element(Expression
*, bool) const;
1950 // The variable's type. This may be NULL if the type is set from
1953 // The initial value. This may be NULL if the variable should be
1954 // initialized to the default value for the type.
1956 // Statements to run before the init statement.
1958 // Location of variable definition.
1960 // Backend representation.
1961 Bvariable
* backend_
;
1962 // Whether this is a global variable.
1963 bool is_global_
: 1;
1964 // Whether this is a function parameter.
1965 bool is_parameter_
: 1;
1966 // Whether this is a closure parameter.
1967 bool is_closure_
: 1;
1968 // Whether this is the receiver parameter of a method.
1969 bool is_receiver_
: 1;
1970 // Whether this is the varargs parameter of a function.
1971 bool is_varargs_parameter_
: 1;
1972 // Whether this variable is ever referenced.
1974 // Whether something takes the address of this variable. For a
1975 // local variable this implies that the variable has to be on the
1976 // heap if it escapes from its function.
1977 bool is_address_taken_
: 1;
1978 // Whether something takes the address of this variable such that
1979 // the address does not escape the function.
1980 bool is_non_escaping_address_taken_
: 1;
1981 // True if we have seen this variable in a traversal.
1983 // True if we have lowered the initialization expression.
1984 bool init_is_lowered_
: 1;
1985 // True if we have flattened the initialization expression.
1986 bool init_is_flattened_
: 1;
1987 // True if init is a tuple used to set the type.
1988 bool type_from_init_tuple_
: 1;
1989 // True if init is a range clause and the type is the index type.
1990 bool type_from_range_index_
: 1;
1991 // True if init is a range clause and the type is the value type.
1992 bool type_from_range_value_
: 1;
1993 // True if init is a channel and the type is the channel's element type.
1994 bool type_from_chan_element_
: 1;
1995 // True if this is a variable created for a type switch case.
1996 bool is_type_switch_var_
: 1;
1997 // True if we have determined types.
1998 bool determined_type_
: 1;
1999 // True if this variable should be put in a unique section. This is
2000 // used for field tracking.
2001 bool in_unique_section_
: 1;
2002 // Whether this variable escapes the function it is created in. This is
2003 // true until shown otherwise.
2005 // The top-level declaration for this variable. Only used for local
2006 // variables. Must be a Temporary_statement if not NULL.
2007 Statement
* toplevel_decl_
;
2010 // A variable which is really the name for a function return value, or
2013 class Result_variable
2016 Result_variable(Type
* type
, Function
* function
, int index
,
2018 : type_(type
), function_(function
), index_(index
), location_(location
),
2019 backend_(NULL
), is_address_taken_(false),
2020 is_non_escaping_address_taken_(false), escapes_(true)
2023 // Get the type of the result variable.
2026 { return this->type_
; }
2028 // Get the function that this is associated with.
2031 { return this->function_
; }
2033 // Index in the list of function results.
2036 { return this->index_
; }
2038 // The location of the variable definition.
2041 { return this->location_
; }
2043 // Whether this variable's address is taken.
2045 is_address_taken() const
2046 { return this->is_address_taken_
; }
2048 // Note that something takes the address of this variable.
2051 { this->is_address_taken_
= true; }
2053 // Return whether the address is taken but does not escape.
2055 is_non_escaping_address_taken() const
2056 { return this->is_non_escaping_address_taken_
; }
2058 // Note that something takes the address of this variable such that
2059 // the address does not escape the function.
2061 set_non_escaping_address_taken()
2062 { this->is_non_escaping_address_taken_
= true; }
2064 // Return whether this variable escapes the function it is declared in.
2067 { return this->escapes_
; }
2069 // Note that this variable does not escape the function it is declared in.
2071 set_does_not_escape()
2072 { this->escapes_
= false; }
2074 // Whether this variable should live in the heap.
2078 return this->is_address_taken_
2082 // Set the function. This is used when cloning functions which call
2085 set_function(Function
* function
)
2086 { this->function_
= function
; }
2088 // Get the backend representation of the variable.
2090 get_backend_variable(Gogo
*, Named_object
*, const std::string
&);
2093 // Type of result variable.
2095 // Function with which this is associated.
2096 Function
* function_
;
2097 // Index in list of results.
2099 // Where the result variable is defined.
2101 // Backend representation.
2102 Bvariable
* backend_
;
2103 // Whether something takes the address of this variable.
2104 bool is_address_taken_
;
2105 // Whether something takes the address of this variable such that
2106 // the address does not escape the function.
2107 bool is_non_escaping_address_taken_
;
2108 // Whether this variable escapes the function it is created in. This is
2109 // true until shown otherwise.
2113 // The value we keep for a named constant. This lets us hold a type
2114 // and an expression.
2116 class Named_constant
2119 Named_constant(Type
* type
, Expression
* expr
, int iota_value
,
2121 : type_(type
), expr_(expr
), iota_value_(iota_value
), location_(location
),
2122 lowering_(false), is_sink_(false), bconst_(NULL
)
2127 { return this->type_
; }
2131 { return this->expr_
; }
2135 { return this->iota_value_
; }
2139 { return this->location_
; }
2141 // Whether we are lowering.
2144 { return this->lowering_
; }
2146 // Set that we are lowering.
2149 { this->lowering_
= true; }
2151 // We are no longer lowering.
2154 { this->lowering_
= false; }
2158 { return this->is_sink_
; }
2162 { this->is_sink_
= true; }
2164 // Traverse the expression.
2166 traverse_expression(Traverse
*);
2168 // Determine the type of the constant if necessary.
2172 // Indicate that we found and reported an error for this constant.
2176 // Export the constant.
2178 export_const(Export
*, const std::string
& name
) const;
2180 // Import a constant.
2182 import_const(Import
*, std::string
*, Type
**, Expression
**);
2184 // Get the backend representation of the constant value.
2186 get_backend(Gogo
*, Named_object
*);
2189 // The type of the constant.
2191 // The expression for the constant.
2193 // If the predeclared constant iota is used in EXPR_, this is the
2194 // value it will have. We do this because at parse time we don't
2195 // know whether the name "iota" will refer to the predeclared
2196 // constant or to something else. We put in the right value in when
2199 // The location of the definition.
2201 // Whether we are currently lowering this constant.
2203 // Whether this constant is blank named and needs only type checking.
2205 // The backend representation of the constant value.
2206 Bexpression
* bconst_
;
2209 // A type declaration.
2211 class Type_declaration
2214 Type_declaration(Location location
)
2215 : location_(location
), in_function_(NULL
), in_function_index_(0),
2216 methods_(), issued_warning_(false)
2219 // Return the location.
2222 { return this->location_
; }
2224 // Return the function in which this type is declared. This will
2225 // return NULL for a type declared in global scope.
2227 in_function(unsigned int* pindex
)
2229 *pindex
= this->in_function_index_
;
2230 return this->in_function_
;
2233 // Set the function in which this type is declared.
2235 set_in_function(Named_object
* f
, unsigned int index
)
2237 this->in_function_
= f
;
2238 this->in_function_index_
= index
;
2241 // Add a method to this type. This is used when methods are defined
2244 add_method(const std::string
& name
, Function
* function
);
2246 // Add a method declaration to this type.
2248 add_method_declaration(const std::string
& name
, Package
*,
2249 Function_type
* type
, Location location
);
2251 // Add an already created object as a method.
2253 add_existing_method(Named_object
* no
)
2254 { this->methods_
.push_back(no
); }
2256 // Return whether any methods were defined.
2258 has_methods() const;
2260 // Return the methods.
2261 const std::vector
<Named_object
*>*
2263 { return &this->methods_
; }
2265 // Define methods when the real type is known.
2267 define_methods(Named_type
*);
2269 // This is called if we are trying to use this type. It returns
2270 // true if we should issue a warning.
2275 // The location of the type declaration.
2277 // If this type is declared in a function, a pointer back to the
2278 // function in which it is defined.
2279 Named_object
* in_function_
;
2280 // The index of this type in IN_FUNCTION_.
2281 unsigned int in_function_index_
;
2282 // Methods defined before the type is defined.
2283 std::vector
<Named_object
*> methods_
;
2284 // True if we have issued a warning about a use of this type
2285 // declaration when it is undefined.
2286 bool issued_warning_
;
2289 // An unknown object. These are created by the parser for forward
2290 // references to names which have not been seen before. In a correct
2291 // program, these will always point to a real definition by the end of
2292 // the parse. Because they point to another Named_object, these may
2293 // only be referenced by Unknown_expression objects.
2298 Unknown_name(Location location
)
2299 : location_(location
), real_named_object_(NULL
)
2302 // Return the location where this name was first seen.
2305 { return this->location_
; }
2307 // Return the real named object that this points to, or NULL if it
2308 // was never resolved.
2310 real_named_object() const
2311 { return this->real_named_object_
; }
2313 // Set the real named object that this points to.
2315 set_real_named_object(Named_object
* no
);
2318 // The location where this name was first seen.
2320 // The real named object when it is known.
2325 // A named object named. This is the result of a declaration. We
2326 // don't use a superclass because they all have to be handled
2334 // An uninitialized Named_object. We should never see this.
2335 NAMED_OBJECT_UNINITIALIZED
,
2336 // An erroneous name. This indicates a parse error, to avoid
2337 // later errors about undefined references.
2338 NAMED_OBJECT_ERRONEOUS
,
2339 // An unknown name. This is used for forward references. In a
2340 // correct program, these will all be resolved by the end of the
2342 NAMED_OBJECT_UNKNOWN
,
2347 // A forward type declaration.
2348 NAMED_OBJECT_TYPE_DECLARATION
,
2351 // A result variable in a function.
2352 NAMED_OBJECT_RESULT_VAR
,
2353 // The blank identifier--the special variable named _.
2357 // A forward func declaration.
2358 NAMED_OBJECT_FUNC_DECLARATION
,
2360 NAMED_OBJECT_PACKAGE
2363 // Return the classification.
2365 classification() const
2366 { return this->classification_
; }
2371 is_erroneous() const
2372 { return this->classification_
== NAMED_OBJECT_ERRONEOUS
; }
2376 { return this->classification_
== NAMED_OBJECT_UNKNOWN
; }
2380 { return this->classification_
== NAMED_OBJECT_CONST
; }
2384 { return this->classification_
== NAMED_OBJECT_TYPE
; }
2387 is_type_declaration() const
2388 { return this->classification_
== NAMED_OBJECT_TYPE_DECLARATION
; }
2392 { return this->classification_
== NAMED_OBJECT_VAR
; }
2395 is_result_variable() const
2396 { return this->classification_
== NAMED_OBJECT_RESULT_VAR
; }
2400 { return this->classification_
== NAMED_OBJECT_SINK
; }
2404 { return this->classification_
== NAMED_OBJECT_FUNC
; }
2407 is_function_declaration() const
2408 { return this->classification_
== NAMED_OBJECT_FUNC_DECLARATION
; }
2412 { return this->classification_
== NAMED_OBJECT_PACKAGE
; }
2416 static Named_object
*
2417 make_erroneous_name(const std::string
& name
)
2418 { return new Named_object(name
, NULL
, NAMED_OBJECT_ERRONEOUS
); }
2420 static Named_object
*
2421 make_unknown_name(const std::string
& name
, Location
);
2423 static Named_object
*
2424 make_constant(const Typed_identifier
&, const Package
*, Expression
*,
2427 static Named_object
*
2428 make_type(const std::string
&, const Package
*, Type
*, Location
);
2430 static Named_object
*
2431 make_type_declaration(const std::string
&, const Package
*, Location
);
2433 static Named_object
*
2434 make_variable(const std::string
&, const Package
*, Variable
*);
2436 static Named_object
*
2437 make_result_variable(const std::string
&, Result_variable
*);
2439 static Named_object
*
2442 static Named_object
*
2443 make_function(const std::string
&, const Package
*, Function
*);
2445 static Named_object
*
2446 make_function_declaration(const std::string
&, const Package
*, Function_type
*,
2449 static Named_object
*
2450 make_package(const std::string
& alias
, Package
* package
);
2457 go_assert(this->classification_
== NAMED_OBJECT_UNKNOWN
);
2458 return this->u_
.unknown_value
;
2462 unknown_value() const
2464 go_assert(this->classification_
== NAMED_OBJECT_UNKNOWN
);
2465 return this->u_
.unknown_value
;
2471 go_assert(this->classification_
== NAMED_OBJECT_CONST
);
2472 return this->u_
.const_value
;
2475 const Named_constant
*
2478 go_assert(this->classification_
== NAMED_OBJECT_CONST
);
2479 return this->u_
.const_value
;
2485 go_assert(this->classification_
== NAMED_OBJECT_TYPE
);
2486 return this->u_
.type_value
;
2492 go_assert(this->classification_
== NAMED_OBJECT_TYPE
);
2493 return this->u_
.type_value
;
2497 type_declaration_value()
2499 go_assert(this->classification_
== NAMED_OBJECT_TYPE_DECLARATION
);
2500 return this->u_
.type_declaration
;
2503 const Type_declaration
*
2504 type_declaration_value() const
2506 go_assert(this->classification_
== NAMED_OBJECT_TYPE_DECLARATION
);
2507 return this->u_
.type_declaration
;
2513 go_assert(this->classification_
== NAMED_OBJECT_VAR
);
2514 return this->u_
.var_value
;
2520 go_assert(this->classification_
== NAMED_OBJECT_VAR
);
2521 return this->u_
.var_value
;
2527 go_assert(this->classification_
== NAMED_OBJECT_RESULT_VAR
);
2528 return this->u_
.result_var_value
;
2531 const Result_variable
*
2532 result_var_value() const
2534 go_assert(this->classification_
== NAMED_OBJECT_RESULT_VAR
);
2535 return this->u_
.result_var_value
;
2541 go_assert(this->classification_
== NAMED_OBJECT_FUNC
);
2542 return this->u_
.func_value
;
2548 go_assert(this->classification_
== NAMED_OBJECT_FUNC
);
2549 return this->u_
.func_value
;
2552 Function_declaration
*
2553 func_declaration_value()
2555 go_assert(this->classification_
== NAMED_OBJECT_FUNC_DECLARATION
);
2556 return this->u_
.func_declaration_value
;
2559 const Function_declaration
*
2560 func_declaration_value() const
2562 go_assert(this->classification_
== NAMED_OBJECT_FUNC_DECLARATION
);
2563 return this->u_
.func_declaration_value
;
2569 go_assert(this->classification_
== NAMED_OBJECT_PACKAGE
);
2570 return this->u_
.package_value
;
2574 package_value() const
2576 go_assert(this->classification_
== NAMED_OBJECT_PACKAGE
);
2577 return this->u_
.package_value
;
2582 { return this->name_
; }
2584 // Return the name to use in an error message. The difference is
2585 // that if this Named_object is defined in a different package, this
2586 // will return PACKAGE.NAME.
2588 message_name() const;
2592 { return this->package_
; }
2594 // Resolve an unknown value if possible. This returns the same
2595 // Named_object or a new one.
2599 Named_object
* ret
= this;
2600 if (this->is_unknown())
2602 Named_object
* r
= this->unknown_value()->real_named_object();
2612 const Named_object
* ret
= this;
2613 if (this->is_unknown())
2615 const Named_object
* r
= this->unknown_value()->real_named_object();
2622 // The location where this object was defined or referenced.
2626 // Convert a variable to the backend representation.
2628 get_backend_variable(Gogo
*, Named_object
* function
);
2630 // Return the external identifier for this object.
2634 // Get the backend representation of this object.
2636 get_backend(Gogo
*, std::vector
<Bexpression
*>&, std::vector
<Btype
*>&,
2637 std::vector
<Bfunction
*>&);
2639 // Define a type declaration.
2641 set_type_value(Named_type
*);
2643 // Define a function declaration.
2645 set_function_value(Function
*);
2647 // Declare an unknown name as a type declaration.
2651 // Export this object.
2653 export_named_object(Export
*) const;
2655 // Mark this named object as an invalid redefinition of another object.
2657 set_is_redefinition()
2658 { this->is_redefinition_
= true; }
2660 // Return whether or not this object is a invalid redefinition of another
2663 is_redefinition() const
2664 { return this->is_redefinition_
; }
2667 Named_object(const std::string
&, const Package
*, Classification
);
2669 // The name of the object.
2671 // The package that this object is in. This is NULL if it is in the
2672 // file we are compiling.
2673 const Package
* package_
;
2674 // The type of object this is.
2675 Classification classification_
;
2679 Unknown_name
* unknown_value
;
2680 Named_constant
* const_value
;
2681 Named_type
* type_value
;
2682 Type_declaration
* type_declaration
;
2683 Variable
* var_value
;
2684 Result_variable
* result_var_value
;
2685 Function
* func_value
;
2686 Function_declaration
* func_declaration_value
;
2687 Package
* package_value
;
2689 // True if this object is an invalid redefinition of another object.
2690 bool is_redefinition_
;
2693 // A binding contour. This binds names to objects.
2698 // Type for mapping from names to objects.
2699 typedef Unordered_map(std::string
, Named_object
*) Contour
;
2701 Bindings(Bindings
* enclosing
);
2703 // Add an erroneous name.
2705 add_erroneous_name(const std::string
& name
)
2706 { return this->add_named_object(Named_object::make_erroneous_name(name
)); }
2708 // Add an unknown name.
2710 add_unknown_name(const std::string
& name
, Location location
)
2712 return this->add_named_object(Named_object::make_unknown_name(name
,
2718 add_constant(const Typed_identifier
& tid
, const Package
* package
,
2719 Expression
* expr
, int iota_value
)
2721 return this->add_named_object(Named_object::make_constant(tid
, package
,
2728 add_type(const std::string
& name
, const Package
* package
, Type
* type
,
2731 return this->add_named_object(Named_object::make_type(name
, package
, type
,
2735 // Add a named type. This is used for builtin types, and to add an
2736 // imported type to the global scope.
2738 add_named_type(Named_type
* named_type
);
2740 // Add a type declaration.
2742 add_type_declaration(const std::string
& name
, const Package
* package
,
2745 Named_object
* no
= Named_object::make_type_declaration(name
, package
,
2747 return this->add_named_object(no
);
2752 add_variable(const std::string
& name
, const Package
* package
,
2755 return this->add_named_object(Named_object::make_variable(name
, package
,
2759 // Add a result variable.
2761 add_result_variable(const std::string
& name
, Result_variable
* result
)
2763 return this->add_named_object(Named_object::make_result_variable(name
,
2769 add_function(const std::string
& name
, const Package
*, Function
* function
);
2771 // Add a function declaration.
2773 add_function_declaration(const std::string
& name
, const Package
* package
,
2774 Function_type
* type
, Location location
);
2776 // Add a package. The location is the location of the import
2779 add_package(const std::string
& alias
, Package
* package
)
2781 Named_object
* no
= Named_object::make_package(alias
, package
);
2782 return this->add_named_object(no
);
2785 // Define a type which was already declared.
2787 define_type(Named_object
*, Named_type
*);
2789 // Add a method to the list of objects. This is not added to the
2792 add_method(Named_object
*);
2794 // Add a named object to this binding.
2796 add_named_object(Named_object
* no
)
2797 { return this->add_named_object_to_contour(&this->bindings_
, no
); }
2799 // Clear all names in file scope from the bindings.
2801 clear_file_scope(Gogo
*);
2803 // Look up a name in this binding contour and in any enclosing
2804 // binding contours. This returns NULL if the name is not found.
2806 lookup(const std::string
&) const;
2808 // Look up a name in this binding contour without looking in any
2809 // enclosing binding contours. Returns NULL if the name is not found.
2811 lookup_local(const std::string
&) const;
2815 remove_binding(Named_object
*);
2817 // Mark all variables as used. This is used for some types of parse
2822 // Traverse the tree. See the Traverse class.
2824 traverse(Traverse
*, bool is_global
);
2826 // Iterate over definitions. This does not include things which
2827 // were only declared.
2829 typedef std::vector
<Named_object
*>::const_iterator
2830 const_definitions_iterator
;
2832 const_definitions_iterator
2833 begin_definitions() const
2834 { return this->named_objects_
.begin(); }
2836 const_definitions_iterator
2837 end_definitions() const
2838 { return this->named_objects_
.end(); }
2840 // Return the number of definitions.
2842 size_definitions() const
2843 { return this->named_objects_
.size(); }
2845 // Return whether there are no definitions.
2847 empty_definitions() const
2848 { return this->named_objects_
.empty(); }
2850 // Iterate over declarations. This is everything that has been
2851 // declared, which includes everything which has been defined.
2853 typedef Contour::const_iterator const_declarations_iterator
;
2855 const_declarations_iterator
2856 begin_declarations() const
2857 { return this->bindings_
.begin(); }
2859 const_declarations_iterator
2860 end_declarations() const
2861 { return this->bindings_
.end(); }
2863 // Return the number of declarations.
2865 size_declarations() const
2866 { return this->bindings_
.size(); }
2868 // Return whether there are no declarations.
2870 empty_declarations() const
2871 { return this->bindings_
.empty(); }
2873 // Return the first declaration.
2876 { return this->bindings_
.empty() ? NULL
: this->bindings_
.begin()->second
; }
2880 add_named_object_to_contour(Contour
*, Named_object
*);
2883 new_definition(Named_object
*, Named_object
*);
2885 // Enclosing bindings.
2886 Bindings
* enclosing_
;
2887 // The list of objects.
2888 std::vector
<Named_object
*> named_objects_
;
2889 // The mapping from names to objects.
2898 Label(const std::string
& name
)
2899 : name_(name
), location_(Linemap::unknown_location()), snapshot_(NULL
),
2900 refs_(), is_used_(false), blabel_(NULL
), depth_(DEPTH_UNKNOWN
)
2903 // Return the label's name.
2906 { return this->name_
; }
2908 // Return whether the label has been defined.
2911 { return !Linemap::is_unknown_location(this->location_
); }
2913 // Return whether the label has been used.
2916 { return this->is_used_
; }
2918 // Record that the label is used.
2921 { this->is_used_
= true; }
2923 // Return whether this label is looping.
2926 { return this->depth_
== DEPTH_LOOPING
; }
2928 // Set this label as looping.
2931 { this->depth_
= DEPTH_LOOPING
; }
2933 // Return whether this label is nonlooping.
2936 { return this->depth_
== DEPTH_NONLOOPING
; }
2938 // Set this label as nonlooping.
2941 { this->depth_
= DEPTH_NONLOOPING
; }
2943 // Return the location of the definition.
2946 { return this->location_
; }
2948 // Return the bindings snapshot.
2951 { return this->snapshot_
; }
2953 // Add a snapshot of a goto which refers to this label.
2955 add_snapshot_ref(Bindings_snapshot
* snapshot
)
2957 go_assert(Linemap::is_unknown_location(this->location_
));
2958 this->refs_
.push_back(snapshot
);
2961 // Return the list of snapshots of goto statements which refer to
2963 const std::vector
<Bindings_snapshot
*>&
2965 { return this->refs_
; }
2967 // Clear the references.
2971 // Define the label at LOCATION with the given bindings snapshot.
2973 define(Location location
, Bindings_snapshot
* snapshot
)
2975 if (this->is_dummy_label())
2977 go_assert(Linemap::is_unknown_location(this->location_
)
2978 && this->snapshot_
== NULL
);
2979 this->location_
= location
;
2980 this->snapshot_
= snapshot
;
2983 // Return the backend representation for this label.
2985 get_backend_label(Translate_context
*);
2987 // Return an expression for the address of this label. This is used
2988 // to get the return address of a deferred function to see whether
2989 // the function may call recover.
2991 get_addr(Translate_context
*, Location location
);
2993 // Return a dummy label, representing any instance of the blank label.
2995 create_dummy_label();
2997 // Return TRUE if this is a dummy label.
2999 is_dummy_label() const
3000 { return this->name_
== "_"; }
3002 // A classification of a label's looping depth.
3006 // A label never jumped to.
3008 // A label jumped to.
3013 // The name of the label.
3015 // The location of the definition. This is 0 if the label has not
3016 // yet been defined.
3018 // A snapshot of the set of bindings defined at this label, used to
3019 // issue errors about invalid goto statements.
3020 Bindings_snapshot
* snapshot_
;
3021 // A list of snapshots of goto statements which refer to this label.
3022 std::vector
<Bindings_snapshot
*> refs_
;
3023 // Whether the label has been used.
3025 // The backend representation.
3027 // The looping depth of this label, for escape analysis.
3031 // An unnamed label. These are used when lowering loops.
3036 Unnamed_label(Location location
)
3037 : location_(location
), derived_from_(NULL
), blabel_(NULL
)
3040 // Get the location where the label is defined.
3043 { return this->location_
; }
3045 // Set the location where the label is defined.
3047 set_location(Location location
)
3048 { this->location_
= location
; }
3050 // Get the top level statement this unnamed label is derived from.
3052 derived_from() const
3053 { return this->derived_from_
; }
3055 // Set the top level statement this unnamed label is derived from.
3057 set_derived_from(Statement
* s
)
3058 { this->derived_from_
= s
; }
3060 // Return a statement which defines this label.
3062 get_definition(Translate_context
*);
3064 // Return a goto to this label from LOCATION.
3066 get_goto(Translate_context
*, Location location
);
3069 // Return the backend representation.
3071 get_blabel(Translate_context
*);
3073 // The location where the label is defined.
3075 // The top-level statement this unnamed label was derived/lowered from.
3076 // This is NULL is this label is not the top-level of a lowered statement.
3077 Statement
* derived_from_
;
3078 // The backend representation of this label.
3082 // An alias for an imported package.
3087 Package_alias(Location location
)
3088 : location_(location
), used_(0)
3091 // The location of the import statement.
3094 { return this->location_
; }
3096 // How many symbols from the package were used under this alias.
3099 { return this->used_
; }
3101 // Note that some symbol was used under this alias.
3107 // The location of the import statement.
3109 // The amount of times some name from this package was used under this alias.
3113 // An imported package.
3118 Package(const std::string
& pkgpath
, const std::string
& pkgpath_symbol
,
3121 // Get the package path used for all symbols exported from this
3125 { return this->pkgpath_
; }
3127 // Return the package path to use for a symbol name.
3129 pkgpath_symbol() const;
3131 // Set the package path symbol.
3133 set_pkgpath_symbol(const std::string
&);
3135 // Return the location of the most recent import statement.
3138 { return this->location_
; }
3140 // Return whether we know the name of this package yet.
3142 has_package_name() const
3143 { return !this->package_name_
.empty(); }
3145 // The name that this package uses in its package clause. This may
3146 // be different from the name in the associated Named_object if the
3147 // import statement used an alias.
3149 package_name() const
3151 go_assert(!this->package_name_
.empty());
3152 return this->package_name_
;
3155 // Return the bindings.
3158 { return this->bindings_
; }
3160 // Type used to map import names to package aliases.
3161 typedef std::map
<std::string
, Package_alias
*> Aliases
;
3163 // Return the set of package aliases.
3166 { return this->aliases_
; }
3168 // Note that some symbol from this package was used and qualified by ALIAS.
3169 // For dot imports, the ALIAS should be ".PACKAGE_NAME".
3171 note_usage(const std::string
& alias
) const;
3173 // Note that USAGE might be a fake usage of this package.
3175 note_fake_usage(Expression
* usage
) const
3176 { this->fake_uses_
.insert(usage
); }
3178 // Forget a given USAGE of this package.
3180 forget_usage(Expression
* usage
) const;
3182 // Clear the used field for the next file.
3186 // Look up a name in the package. Returns NULL if the name is not
3189 lookup(const std::string
& name
) const
3190 { return this->bindings_
->lookup(name
); }
3192 // Set the name of the package.
3194 set_package_name(const std::string
& name
, Location
);
3196 // Set the location of the package. This is used to record the most
3197 // recent import location.
3199 set_location(Location location
)
3200 { this->location_
= location
; }
3202 // Add a package name as an ALIAS for this package.
3204 add_alias(const std::string
& alias
, Location
);
3206 // Add a constant to the package.
3208 add_constant(const Typed_identifier
& tid
, Expression
* expr
)
3209 { return this->bindings_
->add_constant(tid
, this, expr
, 0); }
3211 // Add a type to the package.
3213 add_type(const std::string
& name
, Type
* type
, Location location
)
3214 { return this->bindings_
->add_type(name
, this, type
, location
); }
3216 // Add a type declaration to the package.
3218 add_type_declaration(const std::string
& name
, Location location
)
3219 { return this->bindings_
->add_type_declaration(name
, this, location
); }
3221 // Add a variable to the package.
3223 add_variable(const std::string
& name
, Variable
* variable
)
3224 { return this->bindings_
->add_variable(name
, this, variable
); }
3226 // Add a function declaration to the package.
3228 add_function_declaration(const std::string
& name
, Function_type
* type
,
3230 { return this->bindings_
->add_function_declaration(name
, this, type
, loc
); }
3232 // Determine types of constants.
3237 // The package path for type reflection data.
3238 std::string pkgpath_
;
3239 // The package path for symbol names.
3240 std::string pkgpath_symbol_
;
3241 // The name that this package uses in the package clause. This may
3242 // be the empty string if it is not yet known.
3243 std::string package_name_
;
3244 // The names in this package.
3245 Bindings
* bindings_
;
3246 // The location of the most recent import statement.
3248 // The set of aliases associated with this package.
3250 // A set of possibly fake uses of this package. This is mutable because we
3251 // can track fake uses of a package even if we have a const pointer to it.
3252 mutable std::set
<Expression
*> fake_uses_
;
3255 // Return codes for the traversal functions. This is not an enum
3256 // because we want to be able to declare traversal functions in other
3257 // header files without including this one.
3259 // Continue traversal as usual.
3260 const int TRAVERSE_CONTINUE
= -1;
3263 const int TRAVERSE_EXIT
= 0;
3265 // Continue traversal, but skip components of the current object.
3266 // E.g., if this is returned by Traverse::statement, we do not
3267 // traverse the expressions in the statement even if
3268 // traverse_expressions is set in the traverse_mask.
3269 const int TRAVERSE_SKIP_COMPONENTS
= 1;
3271 // This class is used when traversing the parse tree. The caller uses
3272 // a subclass which overrides functions as desired.
3277 // These bitmasks say what to traverse.
3278 static const unsigned int traverse_variables
= 0x1;
3279 static const unsigned int traverse_constants
= 0x2;
3280 static const unsigned int traverse_functions
= 0x4;
3281 static const unsigned int traverse_blocks
= 0x8;
3282 static const unsigned int traverse_statements
= 0x10;
3283 static const unsigned int traverse_expressions
= 0x20;
3284 static const unsigned int traverse_types
= 0x40;
3285 static const unsigned int traverse_func_declarations
= 0x80;
3287 Traverse(unsigned int traverse_mask
)
3288 : traverse_mask_(traverse_mask
), types_seen_(NULL
), expressions_seen_(NULL
)
3291 virtual ~Traverse();
3293 // The bitmask of what to traverse.
3295 traverse_mask() const
3296 { return this->traverse_mask_
; }
3298 // Record that we are going to traverse a type. This returns true
3299 // if the type has already been seen in this traversal. This is
3300 // required because types, unlike expressions, can form a circular
3303 remember_type(const Type
*);
3305 // Record that we are going to see an expression. This returns true
3306 // if the expression has already been seen in this traversal. This
3307 // is only needed for cases where multiple expressions can point to
3310 remember_expression(const Expression
*);
3312 // These functions return one of the TRAVERSE codes defined above.
3314 // If traverse_variables is set in the mask, this is called for
3315 // every variable in the tree.
3317 variable(Named_object
*);
3319 // If traverse_constants is set in the mask, this is called for
3320 // every named constant in the tree. The bool parameter is true for
3321 // a global constant.
3323 constant(Named_object
*, bool);
3325 // If traverse_functions is set in the mask, this is called for
3326 // every function in the tree.
3328 function(Named_object
*);
3330 // If traverse_blocks is set in the mask, this is called for every
3331 // block in the tree.
3335 // If traverse_statements is set in the mask, this is called for
3336 // every statement in the tree.
3338 statement(Block
*, size_t* index
, Statement
*);
3340 // If traverse_expressions is set in the mask, this is called for
3341 // every expression in the tree.
3343 expression(Expression
**);
3345 // If traverse_types is set in the mask, this is called for every
3346 // type in the tree.
3350 // If traverse_func_declarations is set in the mask, this is called
3351 // for every function declarations in the tree.
3353 function_declaration(Named_object
*);
3356 // A hash table for types we have seen during this traversal. Note
3357 // that this uses the default hash functions for pointers rather
3358 // than Type_hash_identical and Type_identical. This is because for
3359 // traversal we care about seeing a specific type structure. If
3360 // there are two separate instances of identical types, we want to
3362 typedef Unordered_set(const Type
*) Types_seen
;
3364 typedef Unordered_set(const Expression
*) Expressions_seen
;
3366 // Bitmask of what sort of objects to traverse.
3367 unsigned int traverse_mask_
;
3368 // Types which have been seen in this traversal.
3369 Types_seen
* types_seen_
;
3370 // Expressions which have been seen in this traversal.
3371 Expressions_seen
* expressions_seen_
;
3374 // A class which makes it easier to insert new statements before the
3375 // current statement during a traversal.
3377 class Statement_inserter
3380 // Empty constructor.
3381 Statement_inserter()
3382 : block_(NULL
), pindex_(NULL
), gogo_(NULL
), var_(NULL
)
3385 // Constructor for a statement in a block.
3386 Statement_inserter(Block
* block
, size_t *pindex
)
3387 : block_(block
), pindex_(pindex
), gogo_(NULL
), var_(NULL
)
3390 // Constructor for a global variable.
3391 Statement_inserter(Gogo
* gogo
, Variable
* var
)
3392 : block_(NULL
), pindex_(NULL
), gogo_(gogo
), var_(var
)
3393 { go_assert(var
->is_global()); }
3395 // We use the default copy constructor and assignment operator.
3397 // Insert S before the statement we are traversing, or before the
3398 // initialization expression of a global variable.
3400 insert(Statement
* s
);
3403 // The block that the statement is in.
3405 // The index of the statement that we are traversing.
3407 // The IR, needed when looking at an initializer expression for a
3410 // The global variable, when looking at an initializer expression.
3414 // When translating the gogo IR into the backend data structure, this
3415 // is the context we pass down the blocks and statements.
3417 class Translate_context
3420 Translate_context(Gogo
* gogo
, Named_object
* function
, Block
* block
,
3422 : gogo_(gogo
), backend_(gogo
->backend()), function_(function
),
3423 block_(block
), bblock_(bblock
), is_const_(false)
3430 { return this->gogo_
; }
3434 { return this->backend_
; }
3438 { return this->function_
; }
3442 { return this->block_
; }
3446 { return this->bblock_
; }
3450 { return this->is_const_
; }
3452 // Make a constant context.
3455 { this->is_const_
= true; }
3458 // The IR for the entire compilation unit.
3460 // The generator for the backend data structures.
3462 // The function we are currently translating. NULL if not in a
3463 // function, e.g., the initializer of a global variable.
3464 Named_object
* function_
;
3465 // The block we are currently translating. NULL if not in a
3468 // The backend representation of the current block. NULL if block_
3471 // Whether this is being evaluated in a constant context. This is
3472 // used for type descriptor initializers.
3476 // Runtime error codes. These must match the values in
3477 // libgo/runtime/go-runtime-error.c.
3479 // Slice index out of bounds: negative or larger than the length of
3481 static const int RUNTIME_ERROR_SLICE_INDEX_OUT_OF_BOUNDS
= 0;
3483 // Array index out of bounds.
3484 static const int RUNTIME_ERROR_ARRAY_INDEX_OUT_OF_BOUNDS
= 1;
3486 // String index out of bounds.
3487 static const int RUNTIME_ERROR_STRING_INDEX_OUT_OF_BOUNDS
= 2;
3489 // Slice slice out of bounds: negative or larger than the length of
3490 // the slice or high bound less than low bound.
3491 static const int RUNTIME_ERROR_SLICE_SLICE_OUT_OF_BOUNDS
= 3;
3493 // Array slice out of bounds.
3494 static const int RUNTIME_ERROR_ARRAY_SLICE_OUT_OF_BOUNDS
= 4;
3496 // String slice out of bounds.
3497 static const int RUNTIME_ERROR_STRING_SLICE_OUT_OF_BOUNDS
= 5;
3499 // Dereference of nil pointer. This is used when there is a
3500 // dereference of a pointer to a very large struct or array, to ensure
3501 // that a gigantic array is not used a proxy to access random memory
3503 static const int RUNTIME_ERROR_NIL_DEREFERENCE
= 6;
3505 // Slice length or capacity out of bounds in make: negative or
3506 // overflow or length greater than capacity.
3507 static const int RUNTIME_ERROR_MAKE_SLICE_OUT_OF_BOUNDS
= 7;
3509 // Map capacity out of bounds in make: negative or overflow.
3510 static const int RUNTIME_ERROR_MAKE_MAP_OUT_OF_BOUNDS
= 8;
3512 // Channel capacity out of bounds in make: negative or overflow.
3513 static const int RUNTIME_ERROR_MAKE_CHAN_OUT_OF_BOUNDS
= 9;
3515 // Division by zero.
3516 static const int RUNTIME_ERROR_DIVISION_BY_ZERO
= 10;
3518 // Go statement with nil function.
3519 static const int RUNTIME_ERROR_GO_NIL
= 11;
3521 // This is used by some of the langhooks.
3522 extern Gogo
* go_get_gogo();
3524 // Whether we have seen any errors. FIXME: Replace with a backend
3526 extern bool saw_errors();
3528 #endif // !defined(GO_GOGO_H)