/* 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 . */ #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 #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_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"