[thirdparty/gcc.git] / gcc / go / go-lang.c

/* go-lang.c -- Go frontend gcc interface.
   Copyright (C) 2009, 2010, 2011, 2012 Free Software Foundation, Inc.

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 "ansidecl.h"
#include "coretypes.h"
#include "opts.h"
#include "tree.h"
#include "gimple.h"
#include "ggc.h"
#include "toplev.h"
#include "debug.h"
#include "options.h"
#include "flags.h"
#include "convert.h"
#include "diagnostic.h"
#include "langhooks.h"
#include "langhooks-def.h"
#include "except.h"
#include "target.h"
#include "common/common-target.h"

#include <mpfr.h>

#include "go-c.h"

/* Language-dependent contents of a type.  */

struct GTY(()) lang_type
{
  char dummy;
};

/* Language-dependent contents of a decl.  */

struct GTY(()) lang_decl
{
  char dummy;
};

/* Language-dependent contents of an identifier.  This must include a
   tree_identifier.  */

struct GTY(()) lang_identifier
{
  struct tree_identifier common;
};

/* The resulting tree type.  */

union GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
	   chain_next ("CODE_CONTAINS_STRUCT (TREE_CODE (&%h.generic), TS_COMMON) ? ((union lang_tree_node *) TREE_CHAIN (&%h.generic)) : NULL")))
lang_tree_node
{
  union tree_node GTY((tag ("0"),
		       desc ("tree_node_structure (&%h)"))) generic;
  struct lang_identifier GTY((tag ("1"))) identifier;
};

/* We don't use language_function.  */

struct GTY(()) language_function
{
  int dummy;
};

/* Language hooks.  */

static bool
go_langhook_init (void)
{
  build_common_tree_nodes (false, false);

  /* I don't know why this has to be done explicitly.  */
  void_list_node = build_tree_list (NULL_TREE, void_type_node);

  /* We must create the gogo IR after calling build_common_tree_nodes
     (because Gogo::define_builtin_function_trees refers indirectly
     to, e.g., unsigned_char_type_node) but before calling
     build_common_builtin_nodes (because it calls, indirectly,
     go_type_for_size).  */
  go_create_gogo (INT_TYPE_SIZE, POINTER_SIZE);

  build_common_builtin_nodes ();

  /* The default precision for floating point numbers.  This is used
     for floating point constants with abstract type.  This may
     eventually be controllable by a command line option.  */
  mpfr_set_default_prec (128);

  /* Go uses exceptions.  */
  using_eh_for_cleanups ();

  return true;
}

/* The option mask.  */

static unsigned int
go_langhook_option_lang_mask (void)
{
  return CL_Go;
}

/* Initialize the options structure.  */

static void
go_langhook_init_options_struct (struct gcc_options *opts)
{
  /* Go says that signed overflow is precisely defined.  */
  opts->x_flag_wrapv = 1;

  /* We default to using strict aliasing, since Go pointers are safe.
     This is turned off for code that imports the "unsafe" package,
     because using unsafe.pointer violates C style aliasing
     requirements.  */
  opts->x_flag_strict_aliasing = 1;

  /* Default to avoiding range issues for complex multiply and
     divide.  */
  opts->x_flag_complex_method = 2;

  /* The builtin math functions should not set errno.  */
  opts->x_flag_errno_math = 0;
  opts->frontend_set_flag_errno_math = true;

  /* We turn on stack splitting if we can.  */
  if (targetm_common.supports_split_stack (false, opts))
    opts->x_flag_split_stack = 1;

  /* Exceptions are used to handle recovering from panics.  */
  opts->x_flag_exceptions = 1;
  opts->x_flag_non_call_exceptions = 1;
}

/* Infrastructure for a VEC of char * pointers.  */

typedef const char *go_char_p;
DEF_VEC_P(go_char_p);
DEF_VEC_ALLOC_P(go_char_p, heap);

/* The list of directories to search after all the Go specific
   directories have been searched.  */

static VEC(go_char_p, heap) *go_search_dirs;

/* Handle Go specific options.  Return 0 if we didn't do anything.  */

static bool
go_langhook_handle_option (
    size_t scode,
    const char *arg,
    int value ATTRIBUTE_UNUSED,
    int kind ATTRIBUTE_UNUSED,
    location_t loc ATTRIBUTE_UNUSED,
    const struct cl_option_handlers *handlers ATTRIBUTE_UNUSED)
{
  enum opt_code code = (enum opt_code) scode;
  bool ret = true;

  switch (code)
    {
    case OPT_I:
      go_add_search_path (arg);
      break;

    case OPT_L:
      /* A -L option is assumed to come from the compiler driver.
	 This is a system directory.  We search the following
	 directories, if they exist, before this one:
	   dir/go/VERSION
	   dir/go/VERSION/MACHINE
	 This is like include/c++.  */
      {
	static const char dir_separator_str[] = { DIR_SEPARATOR, 0 };
	size_t len;
	char *p;
	struct stat st;

	len = strlen (arg);
	p = XALLOCAVEC (char,
			(len + sizeof "go" + sizeof DEFAULT_TARGET_VERSION
			 + sizeof DEFAULT_TARGET_MACHINE + 3));
	strcpy (p, arg);
	if (len > 0 && !IS_DIR_SEPARATOR (p[len - 1]))
	  strcat (p, dir_separator_str);
	strcat (p, "go");
	strcat (p, dir_separator_str);
	strcat (p, DEFAULT_TARGET_VERSION);
	if (stat (p, &st) == 0 && S_ISDIR (st.st_mode))
	  {
	    go_add_search_path (p);
	    strcat (p, dir_separator_str);
	    strcat (p, DEFAULT_TARGET_MACHINE);
	    if (stat (p, &st) == 0 && S_ISDIR (st.st_mode))
	      go_add_search_path (p);
	  }

	/* Search ARG too, but only after we've searched to Go
	   specific directories for all -L arguments.  */
	VEC_safe_push (go_char_p, heap, go_search_dirs, arg);
      }
      break;

    case OPT_fgo_dump_:
      ret = go_enable_dump (arg) ? true : false;
      break;

    case OPT_fgo_optimize_:
      ret = go_enable_optimize (arg) ? true : false;
      break;

    case OPT_fgo_prefix_:
      go_set_prefix (arg);
      break;

    default:
      /* Just return 1 to indicate that the option is valid.  */
      break;
    }

  return ret;
}

/* Run after parsing options.  */

static bool
go_langhook_post_options (const char **pfilename ATTRIBUTE_UNUSED)
{
  unsigned int ix;
  const char *dir;

  gcc_assert (num_in_fnames > 0);

  FOR_EACH_VEC_ELT (go_char_p, go_search_dirs, ix, dir)
    go_add_search_path (dir);
  VEC_free (go_char_p, heap, go_search_dirs);
  go_search_dirs = NULL;

  if (flag_excess_precision_cmdline == EXCESS_PRECISION_DEFAULT)
    flag_excess_precision_cmdline = EXCESS_PRECISION_STANDARD;

  /* Returning false means that the backend should be used.  */
  return false;
}

static void
go_langhook_parse_file (void)
{
  go_parse_input_files (in_fnames, num_in_fnames, flag_syntax_only,
			go_require_return_statement);
}

static tree
go_langhook_type_for_size (unsigned int bits, int unsignedp)
{
  return go_type_for_size (bits, unsignedp);
}

static tree
go_langhook_type_for_mode (enum machine_mode mode, int unsignedp)
{
  tree type;
  /* Go has no vector types.  Build them here.  FIXME: It does not
     make sense for the middle-end to ask the frontend for a type
     which the frontend does not support.  However, at least for now
     it is required.  See PR 46805.  */
  if (VECTOR_MODE_P (mode))
    {
      tree inner;

      inner = go_langhook_type_for_mode (GET_MODE_INNER (mode), unsignedp);
      if (inner != NULL_TREE)
	return build_vector_type_for_mode (inner, mode);
      return NULL_TREE;
    }

  type = go_type_for_mode (mode, unsignedp);
  if (type)
    return type;

#if HOST_BITS_PER_WIDE_INT >= 64
  /* The middle-end and some backends rely on TImode being supported
     for 64-bit HWI.  */
  if (mode == TImode)
    {
      type = build_nonstandard_integer_type (GET_MODE_BITSIZE (TImode),
					     unsignedp);
      if (type && TYPE_MODE (type) == TImode)
	return type;
    }
#endif
  return NULL_TREE;
}

/* Record a builtin function.  We just ignore builtin functions.  */

static tree
go_langhook_builtin_function (tree decl)
{
  return decl;
}

/* Return true if we are in the global binding level.  */

static bool
go_langhook_global_bindings_p (void)
{
  return current_function_decl == NULL_TREE;
}

/* Push a declaration into the current binding level.  We can't
   usefully implement this since we don't want to convert from tree
   back to one of our internal data structures.  I think the only way
   this is used is to record a decl which is to be returned by
   getdecls, and we could implement it for that purpose if
   necessary.  */

static tree
go_langhook_pushdecl (tree decl ATTRIBUTE_UNUSED)
{
  gcc_unreachable ();
}

/* This hook is used to get the current list of declarations as trees.
   We don't support that; instead we use the write_globals hook.  This
   can't simply crash because it is called by -gstabs.  */

static tree
go_langhook_getdecls (void)
{
  return NULL;
}

/* Write out globals.  */

static void
go_langhook_write_globals (void)
{
  go_write_globals ();
}

/* Go specific gimplification.  We need to gimplify
   CALL_EXPR_STATIC_CHAIN, because the gimplifier doesn't handle
   it.  */

static int
go_langhook_gimplify_expr (tree *expr_p, gimple_seq *pre_p, gimple_seq *post_p)
{
  if (TREE_CODE (*expr_p) == CALL_EXPR
      && CALL_EXPR_STATIC_CHAIN (*expr_p) != NULL_TREE)
    gimplify_expr (&CALL_EXPR_STATIC_CHAIN (*expr_p), pre_p, post_p,
		   is_gimple_val, fb_rvalue);
  return GS_UNHANDLED;
}

/* Return a decl for the exception personality function.  The function
   itself is implemented in libgo/runtime/go-unwind.c.  */

static tree
go_langhook_eh_personality (void)
{
  static tree personality_decl;
  if (personality_decl == NULL_TREE)
    {
      personality_decl = build_personality_function ("gccgo");
      go_preserve_from_gc (personality_decl);
    }
  return personality_decl;
}

/* Functions called directly by the generic backend.  */

tree
convert (tree type, tree expr)
{
  if (type == error_mark_node
      || expr == error_mark_node
      || TREE_TYPE (expr) == error_mark_node)
    return error_mark_node;

  if (type == TREE_TYPE (expr))
    return expr;

  if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (TREE_TYPE (expr)))
    return fold_convert (type, expr);

  switch (TREE_CODE (type))
    {
    case VOID_TYPE:
    case BOOLEAN_TYPE:
      return fold_convert (type, expr);
    case INTEGER_TYPE:
      return fold (convert_to_integer (type, expr));
    case POINTER_TYPE:
      return fold (convert_to_pointer (type, expr));
    case REAL_TYPE:
      return fold (convert_to_real (type, expr));
    case COMPLEX_TYPE:
      return fold (convert_to_complex (type, expr));
    default:
      break;
    }

  gcc_unreachable ();
}

/* FIXME: This is a hack to preserve trees that we create from the
   garbage collector.  */

static GTY(()) tree go_gc_root;

void
go_preserve_from_gc (tree t)
{
  go_gc_root = tree_cons (NULL_TREE, t, go_gc_root);
}

/* Convert an identifier for use in an error message.  */

const char *
go_localize_identifier (const char *ident)
{
  return identifier_to_locale (ident);
}

#undef LANG_HOOKS_NAME
#undef LANG_HOOKS_INIT
#undef LANG_HOOKS_OPTION_LANG_MASK
#undef LANG_HOOKS_INIT_OPTIONS_STRUCT
#undef LANG_HOOKS_HANDLE_OPTION
#undef LANG_HOOKS_POST_OPTIONS
#undef LANG_HOOKS_PARSE_FILE
#undef LANG_HOOKS_TYPE_FOR_MODE
#undef LANG_HOOKS_TYPE_FOR_SIZE
#undef LANG_HOOKS_BUILTIN_FUNCTION
#undef LANG_HOOKS_GLOBAL_BINDINGS_P
#undef LANG_HOOKS_PUSHDECL
#undef LANG_HOOKS_GETDECLS
#undef LANG_HOOKS_WRITE_GLOBALS
#undef LANG_HOOKS_GIMPLIFY_EXPR
#undef LANG_HOOKS_EH_PERSONALITY

#define LANG_HOOKS_NAME			"GNU Go"
#define LANG_HOOKS_INIT			go_langhook_init
#define LANG_HOOKS_OPTION_LANG_MASK	go_langhook_option_lang_mask
#define LANG_HOOKS_INIT_OPTIONS_STRUCT	go_langhook_init_options_struct
#define LANG_HOOKS_HANDLE_OPTION	go_langhook_handle_option
#define LANG_HOOKS_POST_OPTIONS		go_langhook_post_options
#define LANG_HOOKS_PARSE_FILE		go_langhook_parse_file
#define LANG_HOOKS_TYPE_FOR_MODE	go_langhook_type_for_mode
#define LANG_HOOKS_TYPE_FOR_SIZE	go_langhook_type_for_size
#define LANG_HOOKS_BUILTIN_FUNCTION	go_langhook_builtin_function
#define LANG_HOOKS_GLOBAL_BINDINGS_P	go_langhook_global_bindings_p
#define LANG_HOOKS_PUSHDECL		go_langhook_pushdecl
#define LANG_HOOKS_GETDECLS		go_langhook_getdecls
#define LANG_HOOKS_WRITE_GLOBALS	go_langhook_write_globals
#define LANG_HOOKS_GIMPLIFY_EXPR	go_langhook_gimplify_expr
#define LANG_HOOKS_EH_PERSONALITY	go_langhook_eh_personality

struct lang_hooks lang_hooks = LANG_HOOKS_INITIALIZER;

#include "gt-go-go-lang.h"
#include "gtype-go.h"
Commit	Line	Data
7a938933	1	/* go-lang.c -- Go frontend gcc interface.
c2b13bb6	2	Copyright (C) 2009, 2010, 2011, 2012 Free Software Foundation, Inc.
7a938933 ILT	3
	4	This file is part of GCC.
	5
	6	GCC is free software; you can redistribute it and/or modify it under
	7	the terms of the GNU General Public License as published by the Free
	8	Software Foundation; either version 3, or (at your option) any later
	9	version.
	10
	11	GCC is distributed in the hope that it will be useful, but WITHOUT ANY
	12	WARRANTY; without even the implied warranty of MERCHANTABILITY or
	13	FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	14	for more details.
	15
	16	You should have received a copy of the GNU General Public License
	17	along with GCC; see the file COPYING3. If not see
	18	<http://www.gnu.org/licenses/>. */
	19
	20	#include "config.h"
	21	#include "system.h"
	22	#include "ansidecl.h"
	23	#include "coretypes.h"
	24	#include "opts.h"
	25	#include "tree.h"
	26	#include "gimple.h"
	27	#include "ggc.h"
	28	#include "toplev.h"
	29	#include "debug.h"
	30	#include "options.h"
	31	#include "flags.h"
	32	#include "convert.h"
	33	#include "diagnostic.h"
	34	#include "langhooks.h"
	35	#include "langhooks-def.h"
	36	#include "except.h"
	37	#include "target.h"
677f3fa8	38	#include "common/common-target.h"
7a938933 ILT	39
	40	#include <mpfr.h>
	41
	42	#include "go-c.h"
	43
	44	/* Language-dependent contents of a type. */
	45
	46	struct GTY(()) lang_type
	47	{
	48	char dummy;
	49	};
	50
	51	/* Language-dependent contents of a decl. */
	52
	53	struct GTY(()) lang_decl
	54	{
	55	char dummy;
	56	};
	57
	58	/* Language-dependent contents of an identifier. This must include a
	59	tree_identifier. */
	60
	61	struct GTY(()) lang_identifier
	62	{
	63	struct tree_identifier common;
	64	};
	65
	66	/* The resulting tree type. */
	67
	68	union GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
81f653d6	69	chain_next ("CODE_CONTAINS_STRUCT (TREE_CODE (&%h.generic), TS_COMMON) ? ((union lang_tree_node *) TREE_CHAIN (&%h.generic)) : NULL")))
7a938933 ILT	70	lang_tree_node
	71	{
	72	union tree_node GTY((tag ("0"),
	73	desc ("tree_node_structure (&%h)"))) generic;
	74	struct lang_identifier GTY((tag ("1"))) identifier;
	75	};
	76
	77	/* We don't use language_function. */
	78
	79	struct GTY(()) language_function
	80	{
	81	int dummy;
	82	};
	83
	84	/* Language hooks. */
	85
	86	static bool
	87	go_langhook_init (void)
	88	{
1a072294	89	build_common_tree_nodes (false, false);
7a938933	90
00733a00 ILT	91	/* I don't know why this has to be done explicitly. */
	92	void_list_node = build_tree_list (NULL_TREE, void_type_node);
	93
7a938933 ILT	94	/* We must create the gogo IR after calling build_common_tree_nodes
	95	(because Gogo::define_builtin_function_trees refers indirectly
	96	to, e.g., unsigned_char_type_node) but before calling
	97	build_common_builtin_nodes (because it calls, indirectly,
	98	go_type_for_size). */
ff5f50c5	99	go_create_gogo (INT_TYPE_SIZE, POINTER_SIZE);
7a938933 ILT	100
	101	build_common_builtin_nodes ();
	102
7a938933 ILT	103	/* The default precision for floating point numbers. This is used
	104	for floating point constants with abstract type. This may
	105	eventually be controllable by a command line option. */
	106	mpfr_set_default_prec (128);
	107
	108	/* Go uses exceptions. */
	109	using_eh_for_cleanups ();
	110
	111	return true;
	112	}
	113
	114	/* The option mask. */
	115
	116	static unsigned int
	117	go_langhook_option_lang_mask (void)
	118	{
	119	return CL_Go;
	120	}
	121
	122	/* Initialize the options structure. */
	123
	124	static void
	125	go_langhook_init_options_struct (struct gcc_options *opts)
	126	{
	127	/* Go says that signed overflow is precisely defined. */
	128	opts->x_flag_wrapv = 1;
	129
	130	/* We default to using strict aliasing, since Go pointers are safe.
	131	This is turned off for code that imports the "unsafe" package,
	132	because using unsafe.pointer violates C style aliasing
	133	requirements. */
	134	opts->x_flag_strict_aliasing = 1;
	135
	136	/* Default to avoiding range issues for complex multiply and
	137	divide. */
	138	opts->x_flag_complex_method = 2;
	139
	140	/* The builtin math functions should not set errno. */
	141	opts->x_flag_errno_math = 0;
9b548472	142	opts->frontend_set_flag_errno_math = true;
7a938933 ILT	143
7a938933 ILT	144	/* We turn on stack splitting if we can. */
677f3fa8	145	if (targetm_common.supports_split_stack (false, opts))
7a938933 ILT	146	opts->x_flag_split_stack = 1;
	147
	148	/* Exceptions are used to handle recovering from panics. */
	149	opts->x_flag_exceptions = 1;
	150	opts->x_flag_non_call_exceptions = 1;
	151	}
	152
ac819ba5 ILT	153	/* Infrastructure for a VEC of char * pointers. */
	154
	155	typedef const char *go_char_p;
	156	DEF_VEC_P(go_char_p);
	157	DEF_VEC_ALLOC_P(go_char_p, heap);
	158
	159	/* The list of directories to search after all the Go specific
	160	directories have been searched. */
	161
	162	static VEC(go_char_p, heap) *go_search_dirs;
	163
7a938933 ILT	164	/* Handle Go specific options. Return 0 if we didn't do anything. */
	165
	166	static bool
	167	go_langhook_handle_option (
	168	size_t scode,
	169	const char *arg,
	170	int value ATTRIBUTE_UNUSED,
	171	int kind ATTRIBUTE_UNUSED,
	172	location_t loc ATTRIBUTE_UNUSED,
	173	const struct cl_option_handlers *handlers ATTRIBUTE_UNUSED)
	174	{
	175	enum opt_code code = (enum opt_code) scode;
	176	bool ret = true;
	177
	178	switch (code)
	179	{
	180	case OPT_I:
7a938933 ILT	181	go_add_search_path (arg);
	182	break;
	183
ac819ba5 ILT	184	case OPT_L:
	185	/* A -L option is assumed to come from the compiler driver.
	186	This is a system directory. We search the following
	187	directories, if they exist, before this one:
	188	dir/go/VERSION
	189	dir/go/VERSION/MACHINE
	190	This is like include/c++. */
	191	{
	192	static const char dir_separator_str[] = { DIR_SEPARATOR, 0 };
	193	size_t len;
	194	char *p;
	195	struct stat st;
	196
	197	len = strlen (arg);
	198	p = XALLOCAVEC (char,
	199	(len + sizeof "go" + sizeof DEFAULT_TARGET_VERSION
	200	+ sizeof DEFAULT_TARGET_MACHINE + 3));
	201	strcpy (p, arg);
	202	if (len > 0 && !IS_DIR_SEPARATOR (p[len - 1]))
	203	strcat (p, dir_separator_str);
	204	strcat (p, "go");
	205	strcat (p, dir_separator_str);
	206	strcat (p, DEFAULT_TARGET_VERSION);
	207	if (stat (p, &st) == 0 && S_ISDIR (st.st_mode))
	208	{
	209	go_add_search_path (p);
	210	strcat (p, dir_separator_str);
	211	strcat (p, DEFAULT_TARGET_MACHINE);
	212	if (stat (p, &st) == 0 && S_ISDIR (st.st_mode))
	213	go_add_search_path (p);
	214	}
	215
	216	/* Search ARG too, but only after we've searched to Go
	217	specific directories for all -L arguments. */
	218	VEC_safe_push (go_char_p, heap, go_search_dirs, arg);
	219	}
	220	break;
	221
7a938933 ILT	222	case OPT_fgo_dump_:
	223	ret = go_enable_dump (arg) ? true : false;
	224	break;
	225
706cd57f RL	226	case OPT_fgo_optimize_:
	227	ret = go_enable_optimize (arg) ? true : false;
	228	break;
	229
7a938933 ILT	230	case OPT_fgo_prefix_:
	231	go_set_prefix (arg);
	232	break;
	233
	234	default:
	235	/* Just return 1 to indicate that the option is valid. */
	236	break;
	237	}
	238
	239	return ret;
	240	}
	241
	242	/* Run after parsing options. */
	243
	244	static bool
	245	go_langhook_post_options (const char **pfilename ATTRIBUTE_UNUSED)
	246	{
ac819ba5 ILT	247	unsigned int ix;
	248	const char *dir;
	249
7a938933 ILT	250	gcc_assert (num_in_fnames > 0);
7a938933 ILT	251
ac819ba5 ILT	252	FOR_EACH_VEC_ELT (go_char_p, go_search_dirs, ix, dir)
	253	go_add_search_path (dir);
	254	VEC_free (go_char_p, heap, go_search_dirs);
	255	go_search_dirs = NULL;
	256
7a938933 ILT	257	if (flag_excess_precision_cmdline == EXCESS_PRECISION_DEFAULT)
	258	flag_excess_precision_cmdline = EXCESS_PRECISION_STANDARD;
	259
	260	/* Returning false means that the backend should be used. */
	261	return false;
	262	}
	263
	264	static void
	265	go_langhook_parse_file (void)
	266	{
	267	go_parse_input_files (in_fnames, num_in_fnames, flag_syntax_only,
	268	go_require_return_statement);
	269	}
	270
	271	static tree
	272	go_langhook_type_for_size (unsigned int bits, int unsignedp)
	273	{
	274	return go_type_for_size (bits, unsignedp);
	275	}
	276
	277	static tree
	278	go_langhook_type_for_mode (enum machine_mode mode, int unsignedp)
	279	{
c2b13bb6	280	tree type;
0e29f7e5 ILT	281	/* Go has no vector types. Build them here. FIXME: It does not
	282	make sense for the middle-end to ask the frontend for a type
	283	which the frontend does not support. However, at least for now
	284	it is required. See PR 46805. */
	285	if (VECTOR_MODE_P (mode))
	286	{
	287	tree inner;
	288
	289	inner = go_langhook_type_for_mode (GET_MODE_INNER (mode), unsignedp);
	290	if (inner != NULL_TREE)
	291	return build_vector_type_for_mode (inner, mode);
	292	return NULL_TREE;
	293	}
	294
c2b13bb6 JJ	295	type = go_type_for_mode (mode, unsignedp);
	296	if (type)
	297	return type;
	298
	299	#if HOST_BITS_PER_WIDE_INT >= 64
	300	/* The middle-end and some backends rely on TImode being supported
	301	for 64-bit HWI. */
	302	if (mode == TImode)
	303	{
	304	type = build_nonstandard_integer_type (GET_MODE_BITSIZE (TImode),
	305	unsignedp);
	306	if (type && TYPE_MODE (type) == TImode)
	307	return type;
	308	}
	309	#endif
	310	return NULL_TREE;
7a938933 ILT	311	}
	312
	313	/* Record a builtin function. We just ignore builtin functions. */
	314
	315	static tree
	316	go_langhook_builtin_function (tree decl)
	317	{
	318	return decl;
	319	}
	320
c99c0026 EB	321	/* Return true if we are in the global binding level. */
	322
	323	static bool
7a938933 ILT	324	go_langhook_global_bindings_p (void)
7a938933 ILT	325	{
c99c0026	326	return current_function_decl == NULL_TREE;
7a938933 ILT	327	}
	328
	329	/* Push a declaration into the current binding level. We can't
	330	usefully implement this since we don't want to convert from tree
	331	back to one of our internal data structures. I think the only way
	332	this is used is to record a decl which is to be returned by
	333	getdecls, and we could implement it for that purpose if
	334	necessary. */
	335
	336	static tree
	337	go_langhook_pushdecl (tree decl ATTRIBUTE_UNUSED)
	338	{
	339	gcc_unreachable ();
	340	}
	341
	342	/* This hook is used to get the current list of declarations as trees.
	343	We don't support that; instead we use the write_globals hook. This
	344	can't simply crash because it is called by -gstabs. */
	345
	346	static tree
	347	go_langhook_getdecls (void)
	348	{
	349	return NULL;
	350	}
	351
	352	/* Write out globals. */
	353
	354	static void
	355	go_langhook_write_globals (void)
	356	{
	357	go_write_globals ();
	358	}
	359
	360	/* Go specific gimplification. We need to gimplify
	361	CALL_EXPR_STATIC_CHAIN, because the gimplifier doesn't handle
	362	it. */
	363
	364	static int
	365	go_langhook_gimplify_expr (tree expr_p, gimple_seq pre_p, gimple_seq *post_p)
	366	{
	367	if (TREE_CODE (*expr_p) == CALL_EXPR
	368	&& CALL_EXPR_STATIC_CHAIN (*expr_p) != NULL_TREE)
	369	gimplify_expr (&CALL_EXPR_STATIC_CHAIN (*expr_p), pre_p, post_p,
	370	is_gimple_val, fb_rvalue);
	371	return GS_UNHANDLED;
	372	}
	373
	374	/* Return a decl for the exception personality function. The function
	375	itself is implemented in libgo/runtime/go-unwind.c. */
	376
	377	static tree
	378	go_langhook_eh_personality (void)
	379	{
	380	static tree personality_decl;
	381	if (personality_decl == NULL_TREE)
	382	{
	383	personality_decl = build_personality_function ("gccgo");
	384	go_preserve_from_gc (personality_decl);
	385	}
	386	return personality_decl;
	387	}
	388
	389	/* Functions called directly by the generic backend. */
	390
391	tree
392	convert (tree type, tree expr)
393	{
394	if (type == error_mark_node
395	\|\| expr == error_mark_node
396	\|\| TREE_TYPE (expr) == error_mark_node)
397	return error_mark_node;
398
399	if (type == TREE_TYPE (expr))
400	return expr;
401
402	if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (TREE_TYPE (expr)))
403	return fold_convert (type, expr);
404
405	switch (TREE_CODE (type))
406	{
407	case VOID_TYPE:
408	case BOOLEAN_TYPE:
409	return fold_convert (type, expr);
410	case INTEGER_TYPE:
411	return fold (convert_to_integer (type, expr));
412	case POINTER_TYPE:
413	return fold (convert_to_pointer (type, expr));
414	case REAL_TYPE:
415	return fold (convert_to_real (type, expr));
416	case COMPLEX_TYPE:
417	return fold (convert_to_complex (type, expr));
418	default:
419	break;
420	}
421
422	gcc_unreachable ();
423	}
424
425	/* FIXME: This is a hack to preserve trees that we create from the
426	garbage collector. */
427
428	static GTY(()) tree go_gc_root;
429
430	void
431	go_preserve_from_gc (tree t)
432	{
433	go_gc_root = tree_cons (NULL_TREE, t, go_gc_root);
434	}
435
436	/* Convert an identifier for use in an error message. */
437
438	const char *
439	go_localize_identifier (const char *ident)
440	{
441	return identifier_to_locale (ident);
442	}
443
444	#undef LANG_HOOKS_NAME
445	#undef LANG_HOOKS_INIT
446	#undef LANG_HOOKS_OPTION_LANG_MASK
447	#undef LANG_HOOKS_INIT_OPTIONS_STRUCT
448	#undef LANG_HOOKS_HANDLE_OPTION
449	#undef LANG_HOOKS_POST_OPTIONS
450	#undef LANG_HOOKS_PARSE_FILE
451	#undef LANG_HOOKS_TYPE_FOR_MODE
452	#undef LANG_HOOKS_TYPE_FOR_SIZE
453	#undef LANG_HOOKS_BUILTIN_FUNCTION
454	#undef LANG_HOOKS_GLOBAL_BINDINGS_P
455	#undef LANG_HOOKS_PUSHDECL
456	#undef LANG_HOOKS_GETDECLS
457	#undef LANG_HOOKS_WRITE_GLOBALS
458	#undef LANG_HOOKS_GIMPLIFY_EXPR
459	#undef LANG_HOOKS_EH_PERSONALITY
460
461	#define LANG_HOOKS_NAME "GNU Go"
462	#define LANG_HOOKS_INIT go_langhook_init
463	#define LANG_HOOKS_OPTION_LANG_MASK go_langhook_option_lang_mask
464	#define LANG_HOOKS_INIT_OPTIONS_STRUCT go_langhook_init_options_struct
465	#define LANG_HOOKS_HANDLE_OPTION go_langhook_handle_option
466	#define LANG_HOOKS_POST_OPTIONS go_langhook_post_options
467	#define LANG_HOOKS_PARSE_FILE go_langhook_parse_file
468	#define LANG_HOOKS_TYPE_FOR_MODE go_langhook_type_for_mode
469	#define LANG_HOOKS_TYPE_FOR_SIZE go_langhook_type_for_size
470	#define LANG_HOOKS_BUILTIN_FUNCTION go_langhook_builtin_function
471	#define LANG_HOOKS_GLOBAL_BINDINGS_P go_langhook_global_bindings_p
472	#define LANG_HOOKS_PUSHDECL go_langhook_pushdecl
473	#define LANG_HOOKS_GETDECLS go_langhook_getdecls
474	#define LANG_HOOKS_WRITE_GLOBALS go_langhook_write_globals
475	#define LANG_HOOKS_GIMPLIFY_EXPR go_langhook_gimplify_expr
476	#define LANG_HOOKS_EH_PERSONALITY go_langhook_eh_personality
477
478	struct lang_hooks lang_hooks = LANG_HOOKS_INITIALIZER;
479
480	#include "gt-go-go-lang.h"
481	#include "gtype-go.h"