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

/* go-lang.c -- Go frontend gcc interface.
   Copyright (C) 2009-2013 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 "basic-block.h"
#include "gimple-expr.h"
#include "gimplify.h"
#include "stor-layout.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 "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((variable_size)) 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;
};

/* Option information we need to pass to go_create_gogo.  */

static const char *go_pkgpath = NULL;
static const char *go_prefix = NULL;
static const char *go_relative_import_path = NULL;

/* 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, go_pkgpath, go_prefix,
		  go_relative_import_path);

  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 (256);

  /* 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 vector of char * pointers.  */

typedef const char *go_char_p;

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

static vec<go_char_p> 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.  */
	go_search_dirs.safe_push (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_pkgpath_:
      go_pkgpath = arg;
      break;

    case OPT_fgo_prefix_:
      go_prefix = arg;
      break;

    case OPT_fgo_relative_import_path_:
      go_relative_import_path = 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_search_dirs, ix, dir)
    go_add_search_path (dir);
  go_search_dirs.release ();

  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.
d1e082c2	2	Copyright (C) 2009-2013 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"
2fb9a547 AM	26	#include "basic-block.h"
2fb9a547 AM	27	#include "gimple-expr.h"
45b0be94	28	#include "gimplify.h"
d8a2d370	29	#include "stor-layout.h"
7a938933 ILT	30	#include "toplev.h"
	31	#include "debug.h"
	32	#include "options.h"
	33	#include "flags.h"
	34	#include "convert.h"
	35	#include "diagnostic.h"
	36	#include "langhooks.h"
	37	#include "langhooks-def.h"
7a938933	38	#include "target.h"
677f3fa8	39	#include "common/common-target.h"
7a938933 ILT	40
	41	#include <mpfr.h>
	42
	43	#include "go-c.h"
	44
	45	/* Language-dependent contents of a type. */
	46
	47	struct GTY(()) lang_type
	48	{
	49	char dummy;
	50	};
	51
	52	/* Language-dependent contents of a decl. */
	53
0229aee9	54	struct GTY((variable_size)) lang_decl
7a938933 ILT	55	{
	56	char dummy;
	57	};
	58
	59	/* Language-dependent contents of an identifier. This must include a
	60	tree_identifier. */
	61
	62	struct GTY(()) lang_identifier
	63	{
	64	struct tree_identifier common;
	65	};
	66
	67	/* The resulting tree type. */
	68
	69	union GTY((desc ("TREE_CODE (&%h.generic) == IDENTIFIER_NODE"),
81f653d6	70	chain_next ("CODE_CONTAINS_STRUCT (TREE_CODE (&%h.generic), TS_COMMON) ? ((union lang_tree_node *) TREE_CHAIN (&%h.generic)) : NULL")))
7a938933 ILT	71	lang_tree_node
	72	{
	73	union tree_node GTY((tag ("0"),
	74	desc ("tree_node_structure (&%h)"))) generic;
	75	struct lang_identifier GTY((tag ("1"))) identifier;
	76	};
	77
	78	/* We don't use language_function. */
	79
	80	struct GTY(()) language_function
	81	{
	82	int dummy;
	83	};
	84
097b12fb ILT	85	/* Option information we need to pass to go_create_gogo. */
	86
	87	static const char *go_pkgpath = NULL;
	88	static const char *go_prefix = NULL;
4e1866fe	89	static const char *go_relative_import_path = NULL;
097b12fb	90
7a938933 ILT	91	/* Language hooks. */
	92
	93	static bool
	94	go_langhook_init (void)
	95	{
1a072294	96	build_common_tree_nodes (false, false);
7a938933	97
00733a00 ILT	98	/* I don't know why this has to be done explicitly. */
	99	void_list_node = build_tree_list (NULL_TREE, void_type_node);
	100
7a938933 ILT	101	/* We must create the gogo IR after calling build_common_tree_nodes
	102	(because Gogo::define_builtin_function_trees refers indirectly
	103	to, e.g., unsigned_char_type_node) but before calling
	104	build_common_builtin_nodes (because it calls, indirectly,
	105	go_type_for_size). */
4e1866fe ILT	106	go_create_gogo (INT_TYPE_SIZE, POINTER_SIZE, go_pkgpath, go_prefix,
4e1866fe ILT	107	go_relative_import_path);
7a938933 ILT	108
	109	build_common_builtin_nodes ();
	110
7a938933 ILT	111	/* The default precision for floating point numbers. This is used
	112	for floating point constants with abstract type. This may
	113	eventually be controllable by a command line option. */
1ec20ea1	114	mpfr_set_default_prec (256);
7a938933 ILT	115
	116	/* Go uses exceptions. */
	117	using_eh_for_cleanups ();
	118
	119	return true;
	120	}
	121
	122	/* The option mask. */
	123
	124	static unsigned int
	125	go_langhook_option_lang_mask (void)
	126	{
	127	return CL_Go;
	128	}
	129
	130	/* Initialize the options structure. */
	131
	132	static void
	133	go_langhook_init_options_struct (struct gcc_options *opts)
	134	{
	135	/* Go says that signed overflow is precisely defined. */
	136	opts->x_flag_wrapv = 1;
	137
	138	/* We default to using strict aliasing, since Go pointers are safe.
	139	This is turned off for code that imports the "unsafe" package,
	140	because using unsafe.pointer violates C style aliasing
	141	requirements. */
	142	opts->x_flag_strict_aliasing = 1;
	143
	144	/* Default to avoiding range issues for complex multiply and
	145	divide. */
	146	opts->x_flag_complex_method = 2;
	147
	148	/* The builtin math functions should not set errno. */
	149	opts->x_flag_errno_math = 0;
9b548472	150	opts->frontend_set_flag_errno_math = true;
7a938933 ILT	151
7a938933 ILT	152	/* We turn on stack splitting if we can. */
677f3fa8	153	if (targetm_common.supports_split_stack (false, opts))
7a938933 ILT	154	opts->x_flag_split_stack = 1;
	155
	156	/* Exceptions are used to handle recovering from panics. */
	157	opts->x_flag_exceptions = 1;
	158	opts->x_flag_non_call_exceptions = 1;
	159	}
	160
9771b263	161	/* Infrastructure for a vector of char * pointers. */
ac819ba5 ILT	162
ac819ba5 ILT	163	typedef const char *go_char_p;
ac819ba5 ILT	164
	165	/* The list of directories to search after all the Go specific
	166	directories have been searched. */
	167
9771b263	168	static vec<go_char_p> go_search_dirs;
ac819ba5	169
7a938933 ILT	170	/* Handle Go specific options. Return 0 if we didn't do anything. */
	171
	172	static bool
	173	go_langhook_handle_option (
	174	size_t scode,
	175	const char *arg,
	176	int value ATTRIBUTE_UNUSED,
	177	int kind ATTRIBUTE_UNUSED,
	178	location_t loc ATTRIBUTE_UNUSED,
	179	const struct cl_option_handlers *handlers ATTRIBUTE_UNUSED)
	180	{
	181	enum opt_code code = (enum opt_code) scode;
	182	bool ret = true;
	183
	184	switch (code)
	185	{
	186	case OPT_I:
7a938933 ILT	187	go_add_search_path (arg);
	188	break;
	189
ac819ba5 ILT	190	case OPT_L:
	191	/* A -L option is assumed to come from the compiler driver.
	192	This is a system directory. We search the following
	193	directories, if they exist, before this one:
	194	dir/go/VERSION
	195	dir/go/VERSION/MACHINE
	196	This is like include/c++. */
	197	{
	198	static const char dir_separator_str[] = { DIR_SEPARATOR, 0 };
	199	size_t len;
	200	char *p;
	201	struct stat st;
	202
	203	len = strlen (arg);
	204	p = XALLOCAVEC (char,
	205	(len + sizeof "go" + sizeof DEFAULT_TARGET_VERSION
	206	+ sizeof DEFAULT_TARGET_MACHINE + 3));
	207	strcpy (p, arg);
	208	if (len > 0 && !IS_DIR_SEPARATOR (p[len - 1]))
	209	strcat (p, dir_separator_str);
	210	strcat (p, "go");
	211	strcat (p, dir_separator_str);
	212	strcat (p, DEFAULT_TARGET_VERSION);
	213	if (stat (p, &st) == 0 && S_ISDIR (st.st_mode))
	214	{
	215	go_add_search_path (p);
	216	strcat (p, dir_separator_str);
	217	strcat (p, DEFAULT_TARGET_MACHINE);
	218	if (stat (p, &st) == 0 && S_ISDIR (st.st_mode))
	219	go_add_search_path (p);
	220	}
	221
	222	/* Search ARG too, but only after we've searched to Go
	223	specific directories for all -L arguments. */
9771b263	224	go_search_dirs.safe_push (arg);
ac819ba5 ILT	225	}
	226	break;
	227
7a938933 ILT	228	case OPT_fgo_dump_:
	229	ret = go_enable_dump (arg) ? true : false;
	230	break;
	231
706cd57f RL	232	case OPT_fgo_optimize_:
	233	ret = go_enable_optimize (arg) ? true : false;
	234	break;
	235
097b12fb ILT	236	case OPT_fgo_pkgpath_:
	237	go_pkgpath = arg;
	238	break;
	239
7a938933	240	case OPT_fgo_prefix_:
097b12fb	241	go_prefix = arg;
7a938933 ILT	242	break;
7a938933 ILT	243
4e1866fe ILT	244	case OPT_fgo_relative_import_path_:
	245	go_relative_import_path = arg;
	246	break;
	247
7a938933 ILT	248	default:
	249	/* Just return 1 to indicate that the option is valid. */
	250	break;
	251	}
	252
	253	return ret;
	254	}
	255
	256	/* Run after parsing options. */
	257
	258	static bool
	259	go_langhook_post_options (const char **pfilename ATTRIBUTE_UNUSED)
	260	{
ac819ba5 ILT	261	unsigned int ix;
	262	const char *dir;
	263
7a938933 ILT	264	gcc_assert (num_in_fnames > 0);
7a938933 ILT	265
9771b263	266	FOR_EACH_VEC_ELT (go_search_dirs, ix, dir)
ac819ba5	267	go_add_search_path (dir);
9771b263	268	go_search_dirs.release ();
ac819ba5	269
7a938933 ILT	270	if (flag_excess_precision_cmdline == EXCESS_PRECISION_DEFAULT)
	271	flag_excess_precision_cmdline = EXCESS_PRECISION_STANDARD;
	272
	273	/* Returning false means that the backend should be used. */
	274	return false;
	275	}
	276
	277	static void
	278	go_langhook_parse_file (void)
	279	{
	280	go_parse_input_files (in_fnames, num_in_fnames, flag_syntax_only,
	281	go_require_return_statement);
	282	}
	283
	284	static tree
	285	go_langhook_type_for_size (unsigned int bits, int unsignedp)
	286	{
	287	return go_type_for_size (bits, unsignedp);
	288	}
	289
	290	static tree
	291	go_langhook_type_for_mode (enum machine_mode mode, int unsignedp)
	292	{
c2b13bb6	293	tree type;
0e29f7e5 ILT	294	/* Go has no vector types. Build them here. FIXME: It does not
	295	make sense for the middle-end to ask the frontend for a type
	296	which the frontend does not support. However, at least for now
	297	it is required. See PR 46805. */
	298	if (VECTOR_MODE_P (mode))
	299	{
	300	tree inner;
	301
	302	inner = go_langhook_type_for_mode (GET_MODE_INNER (mode), unsignedp);
	303	if (inner != NULL_TREE)
	304	return build_vector_type_for_mode (inner, mode);
	305	return NULL_TREE;
	306	}
	307
c2b13bb6 JJ	308	type = go_type_for_mode (mode, unsignedp);
	309	if (type)
	310	return type;
	311
	312	#if HOST_BITS_PER_WIDE_INT >= 64
	313	/* The middle-end and some backends rely on TImode being supported
	314	for 64-bit HWI. */
	315	if (mode == TImode)
	316	{
	317	type = build_nonstandard_integer_type (GET_MODE_BITSIZE (TImode),
	318	unsignedp);
	319	if (type && TYPE_MODE (type) == TImode)
	320	return type;
	321	}
	322	#endif
	323	return NULL_TREE;
7a938933 ILT	324	}
	325
	326	/* Record a builtin function. We just ignore builtin functions. */
	327
	328	static tree
	329	go_langhook_builtin_function (tree decl)
	330	{
	331	return decl;
	332	}
	333
c99c0026 EB	334	/* Return true if we are in the global binding level. */
	335
	336	static bool
7a938933 ILT	337	go_langhook_global_bindings_p (void)
7a938933 ILT	338	{
c99c0026	339	return current_function_decl == NULL_TREE;
7a938933 ILT	340	}
	341
	342	/* Push a declaration into the current binding level. We can't
	343	usefully implement this since we don't want to convert from tree
	344	back to one of our internal data structures. I think the only way
	345	this is used is to record a decl which is to be returned by
	346	getdecls, and we could implement it for that purpose if
	347	necessary. */
	348
	349	static tree
	350	go_langhook_pushdecl (tree decl ATTRIBUTE_UNUSED)
	351	{
	352	gcc_unreachable ();
	353	}
	354
	355	/* This hook is used to get the current list of declarations as trees.
	356	We don't support that; instead we use the write_globals hook. This
	357	can't simply crash because it is called by -gstabs. */
	358
	359	static tree
	360	go_langhook_getdecls (void)
	361	{
	362	return NULL;
	363	}
	364
	365	/* Write out globals. */
	366
	367	static void
	368	go_langhook_write_globals (void)
	369	{
	370	go_write_globals ();
	371	}
	372
	373	/* Go specific gimplification. We need to gimplify
	374	CALL_EXPR_STATIC_CHAIN, because the gimplifier doesn't handle
	375	it. */
	376
	377	static int
	378	go_langhook_gimplify_expr (tree expr_p, gimple_seq pre_p, gimple_seq *post_p)
	379	{
	380	if (TREE_CODE (*expr_p) == CALL_EXPR
	381	&& CALL_EXPR_STATIC_CHAIN (*expr_p) != NULL_TREE)
	382	gimplify_expr (&CALL_EXPR_STATIC_CHAIN (*expr_p), pre_p, post_p,
	383	is_gimple_val, fb_rvalue);
	384	return GS_UNHANDLED;
	385	}
	386
	387	/* Return a decl for the exception personality function. The function
	388	itself is implemented in libgo/runtime/go-unwind.c. */
	389
	390	static tree
	391	go_langhook_eh_personality (void)
	392	{
	393	static tree personality_decl;
	394	if (personality_decl == NULL_TREE)
	395	{
	396	personality_decl = build_personality_function ("gccgo");
	397	go_preserve_from_gc (personality_decl);
	398	}
	399	return personality_decl;
	400	}
	401
	402	/* Functions called directly by the generic backend. */
	403
404	tree
405	convert (tree type, tree expr)
406	{
407	if (type == error_mark_node
408	\|\| expr == error_mark_node
409	\|\| TREE_TYPE (expr) == error_mark_node)
410	return error_mark_node;
411
412	if (type == TREE_TYPE (expr))
413	return expr;
414
415	if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (TREE_TYPE (expr)))
416	return fold_convert (type, expr);
417
418	switch (TREE_CODE (type))
419	{
420	case VOID_TYPE:
421	case BOOLEAN_TYPE:
422	return fold_convert (type, expr);
423	case INTEGER_TYPE:
424	return fold (convert_to_integer (type, expr));
425	case POINTER_TYPE:
426	return fold (convert_to_pointer (type, expr));
427	case REAL_TYPE:
428	return fold (convert_to_real (type, expr));
429	case COMPLEX_TYPE:
430	return fold (convert_to_complex (type, expr));
431	default:
432	break;
433	}
434
435	gcc_unreachable ();
436	}
437
438	/* FIXME: This is a hack to preserve trees that we create from the
439	garbage collector. */
440
441	static GTY(()) tree go_gc_root;
442
443	void
444	go_preserve_from_gc (tree t)
445	{
446	go_gc_root = tree_cons (NULL_TREE, t, go_gc_root);
447	}
448
449	/* Convert an identifier for use in an error message. */
450
451	const char *
452	go_localize_identifier (const char *ident)
453	{
454	return identifier_to_locale (ident);
455	}
456
457	#undef LANG_HOOKS_NAME
458	#undef LANG_HOOKS_INIT
459	#undef LANG_HOOKS_OPTION_LANG_MASK
460	#undef LANG_HOOKS_INIT_OPTIONS_STRUCT
461	#undef LANG_HOOKS_HANDLE_OPTION
462	#undef LANG_HOOKS_POST_OPTIONS
463	#undef LANG_HOOKS_PARSE_FILE
464	#undef LANG_HOOKS_TYPE_FOR_MODE
465	#undef LANG_HOOKS_TYPE_FOR_SIZE
466	#undef LANG_HOOKS_BUILTIN_FUNCTION
467	#undef LANG_HOOKS_GLOBAL_BINDINGS_P
468	#undef LANG_HOOKS_PUSHDECL
469	#undef LANG_HOOKS_GETDECLS
470	#undef LANG_HOOKS_WRITE_GLOBALS
471	#undef LANG_HOOKS_GIMPLIFY_EXPR
472	#undef LANG_HOOKS_EH_PERSONALITY
473
474	#define LANG_HOOKS_NAME "GNU Go"
475	#define LANG_HOOKS_INIT go_langhook_init
476	#define LANG_HOOKS_OPTION_LANG_MASK go_langhook_option_lang_mask
477	#define LANG_HOOKS_INIT_OPTIONS_STRUCT go_langhook_init_options_struct
478	#define LANG_HOOKS_HANDLE_OPTION go_langhook_handle_option
479	#define LANG_HOOKS_POST_OPTIONS go_langhook_post_options
480	#define LANG_HOOKS_PARSE_FILE go_langhook_parse_file
481	#define LANG_HOOKS_TYPE_FOR_MODE go_langhook_type_for_mode
482	#define LANG_HOOKS_TYPE_FOR_SIZE go_langhook_type_for_size
483	#define LANG_HOOKS_BUILTIN_FUNCTION go_langhook_builtin_function
484	#define LANG_HOOKS_GLOBAL_BINDINGS_P go_langhook_global_bindings_p
485	#define LANG_HOOKS_PUSHDECL go_langhook_pushdecl
486	#define LANG_HOOKS_GETDECLS go_langhook_getdecls
487	#define LANG_HOOKS_WRITE_GLOBALS go_langhook_write_globals
488	#define LANG_HOOKS_GIMPLIFY_EXPR go_langhook_gimplify_expr
489	#define LANG_HOOKS_EH_PERSONALITY go_langhook_eh_personality
490
491	struct lang_hooks lang_hooks = LANG_HOOKS_INITIALIZER;
492
493	#include "gt-go-go-lang.h"
494	#include "gtype-go.h"