gcc/cp/cp-lang.c - gcc - Git at Google

 /* Language-dependent hooks for C++.
    Copyright (C) 2001-2021 Free Software Foundation, Inc.
    Contributed by Alexandre Oliva  <aoliva@redhat.com>

 This file is part of GCC.

 GCC is free software; you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation; either version 3, or (at your option)
 any later version.

 GCC is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with GCC; see the file COPYING3.  If not see
 <http://www.gnu.org/licenses/>.  */

 #include "config.h"
 #include "system.h"
 #include "coretypes.h"
 #include "cp-tree.h"
 #include "stor-layout.h"
 #include "langhooks.h"
 #include "langhooks-def.h"
 #include "cp-objcp-common.h"

 enum c_language_kind c_language = clk_cxx;
 static const char * cxx_dwarf_name (tree t, int verbosity);
 static enum classify_record cp_classify_record (tree type);
 static tree cp_eh_personality (void);
 static tree get_template_innermost_arguments_folded (const_tree);
 static tree get_template_argument_pack_elems_folded (const_tree);
 static tree cxx_enum_underlying_base_type (const_tree);
 static tree *cxx_omp_get_decl_init (tree);
 static void cxx_omp_finish_decl_inits (void);

 /* Lang hooks common to C++ and ObjC++ are declared in cp/cp-objcp-common.h;
    consequently, there should be very few hooks below.  */

 #undef LANG_HOOKS_NAME
 #define LANG_HOOKS_NAME "GNU C++"
 #undef LANG_HOOKS_INIT
 #define LANG_HOOKS_INIT cxx_init
 #undef LANG_HOOKS_CLASSIFY_RECORD
 #define LANG_HOOKS_CLASSIFY_RECORD cp_classify_record
 #undef LANG_HOOKS_GENERIC_TYPE_P
 #define LANG_HOOKS_GENERIC_TYPE_P class_tmpl_impl_spec_p

 #undef LANG_HOOKS_GET_INNERMOST_GENERIC_PARMS
 #define LANG_HOOKS_GET_INNERMOST_GENERIC_PARMS \
 	get_primary_template_innermost_parameters
 #undef LANG_HOOKS_GET_INNERMOST_GENERIC_ARGS
 #define LANG_HOOKS_GET_INNERMOST_GENERIC_ARGS \
 	get_template_innermost_arguments_folded
 #undef LANG_HOOKS_FUNCTION_PARAMETER_PACK_P
 #define LANG_HOOKS_FUNCTION_PARAMETER_PACK_P \
 	function_parameter_pack_p
 #undef LANG_HOOKS_GET_ARGUMENT_PACK_ELEMS
 #define LANG_HOOKS_GET_ARGUMENT_PACK_ELEMS \
 	get_template_argument_pack_elems_folded
 #undef LANG_HOOKS_GENERIC_GENERIC_PARAMETER_DECL_P
 #define LANG_HOOKS_GENERIC_GENERIC_PARAMETER_DECL_P \
 	template_template_parameter_p
 #undef LANG_HOOKS_FUNCTION_PARM_EXPANDED_FROM_PACK_P
 #define LANG_HOOKS_FUNCTION_PARM_EXPANDED_FROM_PACK_P \
 	function_parameter_expanded_from_pack_p
 #undef LANG_HOOKS_GET_GENERIC_FUNCTION_DECL
 #define LANG_HOOKS_GET_GENERIC_FUNCTION_DECL get_function_template_decl
 #undef LANG_HOOKS_DWARF_NAME
 #define LANG_HOOKS_DWARF_NAME cxx_dwarf_name
 #undef LANG_HOOKS_INIT_TS
 #define LANG_HOOKS_INIT_TS cp_common_init_ts
 #undef LANG_HOOKS_EH_PERSONALITY
 #define LANG_HOOKS_EH_PERSONALITY cp_eh_personality
 #undef LANG_HOOKS_EH_RUNTIME_TYPE
 #define LANG_HOOKS_EH_RUNTIME_TYPE build_eh_type_type
 #undef LANG_HOOKS_ENUM_UNDERLYING_BASE_TYPE
 #define LANG_HOOKS_ENUM_UNDERLYING_BASE_TYPE cxx_enum_underlying_base_type
 #undef LANG_HOOKS_PREPROCESS_MAIN_FILE
 #define LANG_HOOKS_PREPROCESS_MAIN_FILE module_begin_main_file
 #undef LANG_HOOKS_PREPROCESS_OPTIONS
 #define LANG_HOOKS_PREPROCESS_OPTIONS module_preprocess_options
 #undef LANG_HOOKS_PREPROCESS_TOKEN
 #define LANG_HOOKS_PREPROCESS_TOKEN module_token_pre

 #if CHECKING_P
 #undef LANG_HOOKS_RUN_LANG_SELFTESTS
 #define LANG_HOOKS_RUN_LANG_SELFTESTS selftest::run_cp_tests
 #endif /* #if CHECKING_P */

 #undef LANG_HOOKS_GET_SUBSTRING_LOCATION
 #define LANG_HOOKS_GET_SUBSTRING_LOCATION c_get_substring_location

 #undef LANG_HOOKS_OMP_GET_DECL_INIT
 #define LANG_HOOKS_OMP_GET_DECL_INIT cxx_omp_get_decl_init

 #undef LANG_HOOKS_OMP_FINISH_DECL_INITS
 #define LANG_HOOKS_OMP_FINISH_DECL_INITS cxx_omp_finish_decl_inits

 /* Each front end provides its own lang hook initializer.  */
 struct lang_hooks lang_hooks = LANG_HOOKS_INITIALIZER;

 /* Lang hook routines common to C++ and ObjC++ appear in cp/cp-objcp-common.c;
    there should be very few routines below.  */

 /* The following function does something real, but only in Objective-C++.  */

 tree
 objcp_tsubst_copy_and_build (tree /*t*/,
 			     tree /*args*/,
 			     tsubst_flags_t /*complain*/,
 			     tree /*in_decl*/,
 			     bool /*function_p*/)
 {
   return NULL_TREE;
 }

 static const char *
 cxx_dwarf_name (tree t, int verbosity)
 {
   gcc_assert (DECL_P (t));

   if (DECL_NAME (t) && IDENTIFIER_ANON_P (DECL_NAME (t)))
     return NULL;
   if (verbosity >= 2)
     return decl_as_dwarf_string (t,
                                  TFF_DECL_SPECIFIERS | TFF_UNQUALIFIED_NAME
                                  | TFF_NO_OMIT_DEFAULT_TEMPLATE_ARGUMENTS);

   return lang_decl_dwarf_name (t, verbosity, false);
 }

 static enum classify_record
 cp_classify_record (tree type)
 {
   if (TYPE_LANG_SPECIFIC (type)
       && CLASSTYPE_DECLARED_CLASS (type))
     return RECORD_IS_CLASS;

   return RECORD_IS_STRUCT;
 }

 static GTY(()) tree cp_eh_personality_decl;

 static tree
 cp_eh_personality (void)
 {
   if (!cp_eh_personality_decl)
     cp_eh_personality_decl = build_personality_function ("gxx");

   return cp_eh_personality_decl;
 }

 /* This is a subroutine of fold_cplus_constants.  It returns TRUE if T
    is a C++ specific constant that needs to be folded further before
    being passed to the debug info emitter.  */

 static bool
 template_arg_needs_folding (const_tree t)
 {
   /* For now only PTRMEM_CST nodes are to be folded further.  */
   if (TREE_CODE (t) == PTRMEM_CST)
     return true;
   return false;
 }

 /* Fold the elements of the TREE_VEC C which are C++ specific nodes
    that would need folding so that they can be processed by the debug
    info emitter. This is a subroutine of
    get_template_innermost_arguments_folded and
    get_template_argument_pack_elems_folded.  */

 static tree
 fold_cplus_constants (const_tree c)
 {
   tree folded_elems, elems = CONST_CAST_TREE (c);
   int vec_len, i;

   if (elems == NULL_TREE || elems == error_mark_node)
     return elems;

   vec_len = TREE_VEC_LENGTH (elems);

   /* First check if there is at least one element that needs
      folding. If there is none, we just return ELEMS. Otherwise create
      and return a new tree vector that contains the folded versions of
      ELEMS. This is to avoid allocating memory if we don't need
      to.  */
   for (i = 0; i < vec_len; ++i)
     {
       if (template_arg_needs_folding (TREE_VEC_ELT (elems, i)))
 	break;
     }
   if (i == vec_len)
     return elems;

   folded_elems = make_tree_vec (vec_len);
   for (i = 0; i < vec_len; ++i)
     {
       tree elem = TREE_VEC_ELT (elems, i);
       TREE_VEC_ELT (folded_elems, i) =
 	(elem && !TYPE_P (elem)) ? cplus_expand_constant (elem) : elem;

     }
   return folded_elems;
 }

 /* The C++ implementation of the LANG_HOOKS_GET_INNERMOST_GENERIC_ARGS
    hook. It returns the innermost template arguments of type T, and
    makes sure those arguments are folded enough for the debug info
    emitter.  */

 static tree
 get_template_innermost_arguments_folded (const_tree t)
 {
   return fold_cplus_constants (get_template_innermost_arguments (t));
 }

 static tree
 get_template_argument_pack_elems_folded (const_tree t)
 {
   return fold_cplus_constants (get_template_argument_pack_elems (t));
 }

 /* The C++ version of the enum_underlying_base_type langhook.
    See also cp/semantics.c (finish_underlying_type).  */

 static
 tree cxx_enum_underlying_base_type (const_tree type)
 {
   tree underlying_type = ENUM_UNDERLYING_TYPE (type);

   if (! ENUM_FIXED_UNDERLYING_TYPE_P (type))
     underlying_type
       = c_common_type_for_mode (TYPE_MODE (underlying_type),
                                 TYPE_UNSIGNED (underlying_type));

   return underlying_type;
 }

 /* The C++ version of the omp_get_decl_init langhook returns the static
    initializer for a variable declaration if present, otherwise it
    tries to find and return the dynamic initializer.  If not present,
    it returns NULL.  */

 static tree *
 cxx_omp_get_decl_init (tree decl)
 {
   if (DECL_INITIAL (decl))
     return &DECL_INITIAL (decl);

   return hash_map_safe_get (dynamic_initializers, decl);
 }

 /* The C++ version of the omp_finish_decl_inits langhook allows GC to
    reclaim the memory used by the hash-map used to hold dynamic initializer
    information.  */

 static void
 cxx_omp_finish_decl_inits (void)
 {
   dynamic_initializers = NULL;
 }

 #if CHECKING_P

 namespace selftest {

 /* Implementation of LANG_HOOKS_RUN_LANG_SELFTESTS for the C++ frontend.  */

 void
 run_cp_tests (void)
 {
   /* Run selftests shared within the C family.  */
   c_family_tests ();

   /* Additional C++-specific tests.  */
   cp_pt_c_tests ();
   cp_tree_c_tests ();
 }

 } // namespace selftest

 #endif /* #if CHECKING_P */


 #include "gt-cp-cp-lang.h"
 #include "gtype-cp.h"
	/* Language-dependent hooks for C++.
	Copyright (C) 2001-2021 Free Software Foundation, Inc.
	Contributed by Alexandre Oliva <aoliva@redhat.com>

	This file is part of GCC.

	GCC is free software; you can redistribute it and/or modify
	it under the terms of the GNU General Public License as published by
	the Free Software Foundation; either version 3, or (at your option)
	any later version.

	GCC is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with GCC; see the file COPYING3. If not see
	<http://www.gnu.org/licenses/>. */

	#include "config.h"
	#include "system.h"
	#include "coretypes.h"
	#include "cp-tree.h"
	#include "stor-layout.h"
	#include "langhooks.h"
	#include "langhooks-def.h"
	#include "cp-objcp-common.h"

	enum c_language_kind c_language = clk_cxx;
	static const char * cxx_dwarf_name (tree t, int verbosity);
	static enum classify_record cp_classify_record (tree type);
	static tree cp_eh_personality (void);
	static tree get_template_innermost_arguments_folded (const_tree);
	static tree get_template_argument_pack_elems_folded (const_tree);
	static tree cxx_enum_underlying_base_type (const_tree);
	static tree *cxx_omp_get_decl_init (tree);
	static void cxx_omp_finish_decl_inits (void);

	/* Lang hooks common to C++ and ObjC++ are declared in cp/cp-objcp-common.h;
	consequently, there should be very few hooks below. */

	#undef LANG_HOOKS_NAME
	#define LANG_HOOKS_NAME "GNU C++"
	#undef LANG_HOOKS_INIT
	#define LANG_HOOKS_INIT cxx_init
	#undef LANG_HOOKS_CLASSIFY_RECORD
	#define LANG_HOOKS_CLASSIFY_RECORD cp_classify_record
	#undef LANG_HOOKS_GENERIC_TYPE_P
	#define LANG_HOOKS_GENERIC_TYPE_P class_tmpl_impl_spec_p

	#undef LANG_HOOKS_GET_INNERMOST_GENERIC_PARMS
	#define LANG_HOOKS_GET_INNERMOST_GENERIC_PARMS \
	get_primary_template_innermost_parameters
	#undef LANG_HOOKS_GET_INNERMOST_GENERIC_ARGS
	#define LANG_HOOKS_GET_INNERMOST_GENERIC_ARGS \
	get_template_innermost_arguments_folded
	#undef LANG_HOOKS_FUNCTION_PARAMETER_PACK_P
	#define LANG_HOOKS_FUNCTION_PARAMETER_PACK_P \
	function_parameter_pack_p
	#undef LANG_HOOKS_GET_ARGUMENT_PACK_ELEMS
	#define LANG_HOOKS_GET_ARGUMENT_PACK_ELEMS \
	get_template_argument_pack_elems_folded
	#undef LANG_HOOKS_GENERIC_GENERIC_PARAMETER_DECL_P
	#define LANG_HOOKS_GENERIC_GENERIC_PARAMETER_DECL_P \
	template_template_parameter_p
	#undef LANG_HOOKS_FUNCTION_PARM_EXPANDED_FROM_PACK_P
	#define LANG_HOOKS_FUNCTION_PARM_EXPANDED_FROM_PACK_P \
	function_parameter_expanded_from_pack_p
	#undef LANG_HOOKS_GET_GENERIC_FUNCTION_DECL
	#define LANG_HOOKS_GET_GENERIC_FUNCTION_DECL get_function_template_decl
	#undef LANG_HOOKS_DWARF_NAME
	#define LANG_HOOKS_DWARF_NAME cxx_dwarf_name
	#undef LANG_HOOKS_INIT_TS
	#define LANG_HOOKS_INIT_TS cp_common_init_ts
	#undef LANG_HOOKS_EH_PERSONALITY
	#define LANG_HOOKS_EH_PERSONALITY cp_eh_personality
	#undef LANG_HOOKS_EH_RUNTIME_TYPE
	#define LANG_HOOKS_EH_RUNTIME_TYPE build_eh_type_type
	#undef LANG_HOOKS_ENUM_UNDERLYING_BASE_TYPE
	#define LANG_HOOKS_ENUM_UNDERLYING_BASE_TYPE cxx_enum_underlying_base_type
	#undef LANG_HOOKS_PREPROCESS_MAIN_FILE
	#define LANG_HOOKS_PREPROCESS_MAIN_FILE module_begin_main_file
	#undef LANG_HOOKS_PREPROCESS_OPTIONS
	#define LANG_HOOKS_PREPROCESS_OPTIONS module_preprocess_options
	#undef LANG_HOOKS_PREPROCESS_TOKEN
	#define LANG_HOOKS_PREPROCESS_TOKEN module_token_pre

	#if CHECKING_P
	#undef LANG_HOOKS_RUN_LANG_SELFTESTS
	#define LANG_HOOKS_RUN_LANG_SELFTESTS selftest::run_cp_tests
	#endif /* #if CHECKING_P */

	#undef LANG_HOOKS_GET_SUBSTRING_LOCATION
	#define LANG_HOOKS_GET_SUBSTRING_LOCATION c_get_substring_location

	#undef LANG_HOOKS_OMP_GET_DECL_INIT
	#define LANG_HOOKS_OMP_GET_DECL_INIT cxx_omp_get_decl_init

	#undef LANG_HOOKS_OMP_FINISH_DECL_INITS
	#define LANG_HOOKS_OMP_FINISH_DECL_INITS cxx_omp_finish_decl_inits

	/* Each front end provides its own lang hook initializer. */
	struct lang_hooks lang_hooks = LANG_HOOKS_INITIALIZER;

	/* Lang hook routines common to C++ and ObjC++ appear in cp/cp-objcp-common.c;
	there should be very few routines below. */

	/* The following function does something real, but only in Objective-C++. */

	tree
	objcp_tsubst_copy_and_build (tree /t/,
	tree /args/,
	tsubst_flags_t /complain/,
	tree /in_decl/,
	bool /function_p/)
	{
	return NULL_TREE;
	}

	static const char *
	cxx_dwarf_name (tree t, int verbosity)
	{
	gcc_assert (DECL_P (t));

	if (DECL_NAME (t) && IDENTIFIER_ANON_P (DECL_NAME (t)))
	return NULL;
	if (verbosity >= 2)
	return decl_as_dwarf_string (t,
	TFF_DECL_SPECIFIERS \| TFF_UNQUALIFIED_NAME
	\| TFF_NO_OMIT_DEFAULT_TEMPLATE_ARGUMENTS);

	return lang_decl_dwarf_name (t, verbosity, false);
	}

	static enum classify_record
	cp_classify_record (tree type)
	{
	if (TYPE_LANG_SPECIFIC (type)
	&& CLASSTYPE_DECLARED_CLASS (type))
	return RECORD_IS_CLASS;

	return RECORD_IS_STRUCT;
	}

	static GTY(()) tree cp_eh_personality_decl;

	static tree
	cp_eh_personality (void)
	{
	if (!cp_eh_personality_decl)
	cp_eh_personality_decl = build_personality_function ("gxx");

	return cp_eh_personality_decl;
	}

	/* This is a subroutine of fold_cplus_constants. It returns TRUE if T
	is a C++ specific constant that needs to be folded further before
	being passed to the debug info emitter. */

	static bool
	template_arg_needs_folding (const_tree t)
	{
	/* For now only PTRMEM_CST nodes are to be folded further. */
	if (TREE_CODE (t) == PTRMEM_CST)
	return true;
	return false;
	}

	/* Fold the elements of the TREE_VEC C which are C++ specific nodes
	that would need folding so that they can be processed by the debug
	info emitter. This is a subroutine of
	get_template_innermost_arguments_folded and
	get_template_argument_pack_elems_folded. */

	static tree
	fold_cplus_constants (const_tree c)
	{
	tree folded_elems, elems = CONST_CAST_TREE (c);
	int vec_len, i;

	if (elems == NULL_TREE \|\| elems == error_mark_node)
	return elems;

	vec_len = TREE_VEC_LENGTH (elems);

	/* First check if there is at least one element that needs
	folding. If there is none, we just return ELEMS. Otherwise create
	and return a new tree vector that contains the folded versions of
	ELEMS. This is to avoid allocating memory if we don't need
	to. */
	for (i = 0; i < vec_len; ++i)
	{
	if (template_arg_needs_folding (TREE_VEC_ELT (elems, i)))
	break;
	}
	if (i == vec_len)
	return elems;

	folded_elems = make_tree_vec (vec_len);
	for (i = 0; i < vec_len; ++i)
	{
	tree elem = TREE_VEC_ELT (elems, i);
	TREE_VEC_ELT (folded_elems, i) =
	(elem && !TYPE_P (elem)) ? cplus_expand_constant (elem) : elem;

	}
	return folded_elems;
	}

	/* The C++ implementation of the LANG_HOOKS_GET_INNERMOST_GENERIC_ARGS
	hook. It returns the innermost template arguments of type T, and
	makes sure those arguments are folded enough for the debug info
	emitter. */

	static tree
	get_template_innermost_arguments_folded (const_tree t)
	{
	return fold_cplus_constants (get_template_innermost_arguments (t));
	}

	static tree
	get_template_argument_pack_elems_folded (const_tree t)
	{
	return fold_cplus_constants (get_template_argument_pack_elems (t));
	}

	/* The C++ version of the enum_underlying_base_type langhook.
	See also cp/semantics.c (finish_underlying_type). */

	static
	tree cxx_enum_underlying_base_type (const_tree type)
	{
	tree underlying_type = ENUM_UNDERLYING_TYPE (type);

	if (! ENUM_FIXED_UNDERLYING_TYPE_P (type))
	underlying_type
	= c_common_type_for_mode (TYPE_MODE (underlying_type),
	TYPE_UNSIGNED (underlying_type));

	return underlying_type;
	}

	/* The C++ version of the omp_get_decl_init langhook returns the static
	initializer for a variable declaration if present, otherwise it
	tries to find and return the dynamic initializer. If not present,
	it returns NULL. */

	static tree *
	cxx_omp_get_decl_init (tree decl)
	{
	if (DECL_INITIAL (decl))
	return &DECL_INITIAL (decl);

	return hash_map_safe_get (dynamic_initializers, decl);
	}

	/* The C++ version of the omp_finish_decl_inits langhook allows GC to
	reclaim the memory used by the hash-map used to hold dynamic initializer
	information. */

	static void
	cxx_omp_finish_decl_inits (void)
	{
	dynamic_initializers = NULL;
	}

	#if CHECKING_P

	namespace selftest {

	/* Implementation of LANG_HOOKS_RUN_LANG_SELFTESTS for the C++ frontend. */

	void
	run_cp_tests (void)
	{
	/* Run selftests shared within the C family. */
	c_family_tests ();

	/* Additional C++-specific tests. */
	cp_pt_c_tests ();
	cp_tree_c_tests ();
	}

	} // namespace selftest

	#endif /* #if CHECKING_P */


	#include "gt-cp-cp-lang.h"
	#include "gtype-cp.h"