[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 "gimple.h"
#include "gimplify.h"
#include "stor-layout.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 "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;

  /* The isolate_erroneous_paths optimization can change a nil
     dereference from a panic to a trap, so we have to disable it for
     Go, even though it is normally enabled by -O2.  */
  if (!global_options_set.x_flag_isolate_erroneous_paths)
    global_options.x_flag_isolate_erroneous_paths = 0;

  /* 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
e440a328	1	/* go-lang.c -- Go frontend gcc interface.
711789cc	2	Copyright (C) 2009-2013 Free Software Foundation, Inc.
e440a328	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"
e795d6e1	26	#include "gimple.h"
a8783bee	27	#include "gimplify.h"
9ed99284	28	#include "stor-layout.h"
e440a328	29	#include "ggc.h"
	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"
e440a328	38	#include "target.h"
218e3e4e	39	#include "common/common-target.h"
e440a328	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
a5656b73	54	struct GTY((variable_size)) lang_decl
e440a328	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"),
9b88d08d	70	chain_next ("CODE_CONTAINS_STRUCT (TREE_CODE (&%h.generic), TS_COMMON) ? ((union lang_tree_node *) TREE_CHAIN (&%h.generic)) : NULL")))
e440a328	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
2a2647e2	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;
0b1e172c	89	static const char *go_relative_import_path = NULL;
2a2647e2	90
e440a328	91	/* Language hooks. */
	92
	93	static bool
	94	go_langhook_init (void)
	95	{
c38a75b7	96	build_common_tree_nodes (false, false);
e440a328	97
e5287e21	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
e440a328	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). */
0b1e172c	106	go_create_gogo (INT_TYPE_SIZE, POINTER_SIZE, go_pkgpath, go_prefix,
0b1e172c	107	go_relative_import_path);
e440a328	108
	109	build_common_builtin_nodes ();
	110
e440a328	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. */
f68344e7	114	mpfr_set_default_prec (256);
e440a328	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;
11a9e74f	150	opts->frontend_set_flag_errno_math = true;
e440a328	151
e440a328	152	/* We turn on stack splitting if we can. */
218e3e4e	153	if (targetm_common.supports_split_stack (false, opts))
e440a328	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
f1f41a6c	161	/* Infrastructure for a vector of char * pointers. */
b978ac2f	162
b978ac2f	163	typedef const char *go_char_p;
b978ac2f	164
	165	/* The list of directories to search after all the Go specific
	166	directories have been searched. */
	167
f1f41a6c	168	static vec<go_char_p> go_search_dirs;
b978ac2f	169
e440a328	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:
e440a328	187	go_add_search_path (arg);
	188	break;
	189
b978ac2f	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. */
f1f41a6c	224	go_search_dirs.safe_push (arg);
b978ac2f	225	}
	226	break;
	227
e440a328	228	case OPT_fgo_dump_:
	229	ret = go_enable_dump (arg) ? true : false;
	230	break;
	231
8b1c301d	232	case OPT_fgo_optimize_:
	233	ret = go_enable_optimize (arg) ? true : false;
	234	break;
	235
2a2647e2	236	case OPT_fgo_pkgpath_:
	237	go_pkgpath = arg;
	238	break;
	239
e440a328	240	case OPT_fgo_prefix_:
2a2647e2	241	go_prefix = arg;
e440a328	242	break;
e440a328	243
0b1e172c	244	case OPT_fgo_relative_import_path_:
	245	go_relative_import_path = arg;
	246	break;
	247
e440a328	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	{
b978ac2f	261	unsigned int ix;
	262	const char *dir;
	263
e440a328	264	gcc_assert (num_in_fnames > 0);
e440a328	265
f1f41a6c	266	FOR_EACH_VEC_ELT (go_search_dirs, ix, dir)
b978ac2f	267	go_add_search_path (dir);
f1f41a6c	268	go_search_dirs.release ();
b978ac2f	269
e440a328	270	if (flag_excess_precision_cmdline == EXCESS_PRECISION_DEFAULT)
	271	flag_excess_precision_cmdline = EXCESS_PRECISION_STANDARD;
	272
87351ae8	273	/* The isolate_erroneous_paths optimization can change a nil
	274	dereference from a panic to a trap, so we have to disable it for
	275	Go, even though it is normally enabled by -O2. */
	276	if (!global_options_set.x_flag_isolate_erroneous_paths)
	277	global_options.x_flag_isolate_erroneous_paths = 0;
	278
e440a328	279	/* Returning false means that the backend should be used. */
	280	return false;
	281	}
	282
	283	static void
	284	go_langhook_parse_file (void)
	285	{
	286	go_parse_input_files (in_fnames, num_in_fnames, flag_syntax_only,
	287	go_require_return_statement);
	288	}
	289
	290	static tree
	291	go_langhook_type_for_size (unsigned int bits, int unsignedp)
	292	{
	293	return go_type_for_size (bits, unsignedp);
	294	}
	295
	296	static tree
	297	go_langhook_type_for_mode (enum machine_mode mode, int unsignedp)
	298	{
d74c2623	299	tree type;
1c919d2d	300	/* Go has no vector types. Build them here. FIXME: It does not
	301	make sense for the middle-end to ask the frontend for a type
	302	which the frontend does not support. However, at least for now
	303	it is required. See PR 46805. */
	304	if (VECTOR_MODE_P (mode))
	305	{
	306	tree inner;
	307
	308	inner = go_langhook_type_for_mode (GET_MODE_INNER (mode), unsignedp);
	309	if (inner != NULL_TREE)
	310	return build_vector_type_for_mode (inner, mode);
	311	return NULL_TREE;
	312	}
	313
d74c2623	314	type = go_type_for_mode (mode, unsignedp);
	315	if (type)
	316	return type;
	317
	318	#if HOST_BITS_PER_WIDE_INT >= 64
	319	/* The middle-end and some backends rely on TImode being supported
	320	for 64-bit HWI. */
	321	if (mode == TImode)
	322	{
	323	type = build_nonstandard_integer_type (GET_MODE_BITSIZE (TImode),
	324	unsignedp);
	325	if (type && TYPE_MODE (type) == TImode)
	326	return type;
	327	}
	328	#endif
	329	return NULL_TREE;
e440a328	330	}
	331
	332	/* Record a builtin function. We just ignore builtin functions. */
	333
	334	static tree
	335	go_langhook_builtin_function (tree decl)
	336	{
	337	return decl;
	338	}
	339
1d2bb655	340	/* Return true if we are in the global binding level. */
	341
	342	static bool
e440a328	343	go_langhook_global_bindings_p (void)
e440a328	344	{
1d2bb655	345	return current_function_decl == NULL_TREE;
e440a328	346	}
	347
	348	/* Push a declaration into the current binding level. We can't
	349	usefully implement this since we don't want to convert from tree
	350	back to one of our internal data structures. I think the only way
	351	this is used is to record a decl which is to be returned by
	352	getdecls, and we could implement it for that purpose if
	353	necessary. */
	354
	355	static tree
	356	go_langhook_pushdecl (tree decl ATTRIBUTE_UNUSED)
	357	{
	358	gcc_unreachable ();
	359	}
	360
	361	/* This hook is used to get the current list of declarations as trees.
	362	We don't support that; instead we use the write_globals hook. This
	363	can't simply crash because it is called by -gstabs. */
	364
	365	static tree
	366	go_langhook_getdecls (void)
	367	{
	368	return NULL;
	369	}
	370
	371	/* Write out globals. */
	372
	373	static void
	374	go_langhook_write_globals (void)
	375	{
	376	go_write_globals ();
	377	}
	378
	379	/* Go specific gimplification. We need to gimplify
	380	CALL_EXPR_STATIC_CHAIN, because the gimplifier doesn't handle
	381	it. */
	382
	383	static int
	384	go_langhook_gimplify_expr (tree expr_p, gimple_seq pre_p, gimple_seq *post_p)
	385	{
	386	if (TREE_CODE (*expr_p) == CALL_EXPR
	387	&& CALL_EXPR_STATIC_CHAIN (*expr_p) != NULL_TREE)
	388	gimplify_expr (&CALL_EXPR_STATIC_CHAIN (*expr_p), pre_p, post_p,
	389	is_gimple_val, fb_rvalue);
	390	return GS_UNHANDLED;
	391	}
	392
	393	/* Return a decl for the exception personality function. The function
	394	itself is implemented in libgo/runtime/go-unwind.c. */
	395
	396	static tree
	397	go_langhook_eh_personality (void)
	398	{
	399	static tree personality_decl;
	400	if (personality_decl == NULL_TREE)
	401	{
	402	personality_decl = build_personality_function ("gccgo");
	403	go_preserve_from_gc (personality_decl);
	404	}
	405	return personality_decl;
	406	}
	407
	408	/* Functions called directly by the generic backend. */
	409
410	tree
411	convert (tree type, tree expr)
412	{
413	if (type == error_mark_node
414	\|\| expr == error_mark_node
415	\|\| TREE_TYPE (expr) == error_mark_node)
416	return error_mark_node;
417
418	if (type == TREE_TYPE (expr))
419	return expr;
420
421	if (TYPE_MAIN_VARIANT (type) == TYPE_MAIN_VARIANT (TREE_TYPE (expr)))
422	return fold_convert (type, expr);
423
424	switch (TREE_CODE (type))
425	{
426	case VOID_TYPE:
427	case BOOLEAN_TYPE:
428	return fold_convert (type, expr);
429	case INTEGER_TYPE:
430	return fold (convert_to_integer (type, expr));
431	case POINTER_TYPE:
432	return fold (convert_to_pointer (type, expr));
433	case REAL_TYPE:
434	return fold (convert_to_real (type, expr));
435	case COMPLEX_TYPE:
436	return fold (convert_to_complex (type, expr));
437	default:
438	break;
439	}
440
441	gcc_unreachable ();
442	}
443
444	/* FIXME: This is a hack to preserve trees that we create from the
445	garbage collector. */
446
447	static GTY(()) tree go_gc_root;
448
449	void
450	go_preserve_from_gc (tree t)
451	{
452	go_gc_root = tree_cons (NULL_TREE, t, go_gc_root);
453	}
454
455	/* Convert an identifier for use in an error message. */
456
457	const char *
458	go_localize_identifier (const char *ident)
459	{
460	return identifier_to_locale (ident);
461	}
462
463	#undef LANG_HOOKS_NAME
464	#undef LANG_HOOKS_INIT
465	#undef LANG_HOOKS_OPTION_LANG_MASK
466	#undef LANG_HOOKS_INIT_OPTIONS_STRUCT
467	#undef LANG_HOOKS_HANDLE_OPTION
468	#undef LANG_HOOKS_POST_OPTIONS
469	#undef LANG_HOOKS_PARSE_FILE
470	#undef LANG_HOOKS_TYPE_FOR_MODE
471	#undef LANG_HOOKS_TYPE_FOR_SIZE
472	#undef LANG_HOOKS_BUILTIN_FUNCTION
473	#undef LANG_HOOKS_GLOBAL_BINDINGS_P
474	#undef LANG_HOOKS_PUSHDECL
475	#undef LANG_HOOKS_GETDECLS
476	#undef LANG_HOOKS_WRITE_GLOBALS
477	#undef LANG_HOOKS_GIMPLIFY_EXPR
478	#undef LANG_HOOKS_EH_PERSONALITY
479
480	#define LANG_HOOKS_NAME "GNU Go"
481	#define LANG_HOOKS_INIT go_langhook_init
482	#define LANG_HOOKS_OPTION_LANG_MASK go_langhook_option_lang_mask
483	#define LANG_HOOKS_INIT_OPTIONS_STRUCT go_langhook_init_options_struct
484	#define LANG_HOOKS_HANDLE_OPTION go_langhook_handle_option
485	#define LANG_HOOKS_POST_OPTIONS go_langhook_post_options
486	#define LANG_HOOKS_PARSE_FILE go_langhook_parse_file
487	#define LANG_HOOKS_TYPE_FOR_MODE go_langhook_type_for_mode
488	#define LANG_HOOKS_TYPE_FOR_SIZE go_langhook_type_for_size
489	#define LANG_HOOKS_BUILTIN_FUNCTION go_langhook_builtin_function
490	#define LANG_HOOKS_GLOBAL_BINDINGS_P go_langhook_global_bindings_p
491	#define LANG_HOOKS_PUSHDECL go_langhook_pushdecl
492	#define LANG_HOOKS_GETDECLS go_langhook_getdecls
493	#define LANG_HOOKS_WRITE_GLOBALS go_langhook_write_globals
494	#define LANG_HOOKS_GIMPLIFY_EXPR go_langhook_gimplify_expr
495	#define LANG_HOOKS_EH_PERSONALITY go_langhook_eh_personality
496
497	struct lang_hooks lang_hooks = LANG_HOOKS_INITIALIZER;
498
499	#include "gt-go-go-lang.h"
500	#include "gtype-go.h"