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/* 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"