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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.5.1/] [gcc/] [cp/] [repo.c] - Rev 310
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/* Code to maintain a C++ template repository. Copyright (C) 1995, 1996, 1997, 1998, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc. Contributed by Jason Merrill (jason@cygnus.com) 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/>. */ /* My strategy here is as follows: Everything should be emitted in a translation unit where it is used. The results of the automatic process should be easily reproducible with explicit code. */ #include "config.h" #include "system.h" #include "coretypes.h" #include "tm.h" #include "tree.h" #include "cp-tree.h" #include "input.h" #include "obstack.h" #include "toplev.h" #include "diagnostic.h" #include "flags.h" static const char *extract_string (const char **); static const char *get_base_filename (const char *); static FILE *open_repo_file (const char *); static char *afgets (FILE *); static FILE *reopen_repo_file_for_write (void); static GTY(()) tree pending_repo; static char *repo_name; static const char *old_args, *old_dir, *old_main; static struct obstack temporary_obstack; static bool temporary_obstack_initialized_p; /* Parse a reasonable subset of shell quoting syntax. */ static const char * extract_string (const char **pp) { const char *p = *pp; int backquote = 0; int inside = 0; for (;;) { char c = *p; if (c == '\0') break; ++p; if (backquote) { obstack_1grow (&temporary_obstack, c); backquote = 0; } else if (! inside && c == ' ') break; else if (! inside && c == '\\') backquote = 1; else if (c == '\'') inside = !inside; else obstack_1grow (&temporary_obstack, c); } obstack_1grow (&temporary_obstack, '\0'); *pp = p; return (char *) obstack_finish (&temporary_obstack); } static const char * get_base_filename (const char *filename) { const char *p = getenv ("COLLECT_GCC_OPTIONS"); const char *output = NULL; int compiling = 0; while (p && *p) { const char *q = extract_string (&p); if (strcmp (q, "-o") == 0) { if (flag_compare_debug) /* Just in case aux_base_name was based on a name with two or more '.'s, add an arbitrary extension that will be stripped by the caller. */ output = concat (aux_base_name, ".o", NULL); else output = extract_string (&p); } else if (strcmp (q, "-c") == 0) compiling = 1; } if (compiling && output) return output; if (p && ! compiling) { warning (0, "-frepo must be used with -c"); flag_use_repository = 0; return NULL; } return lbasename (filename); } static FILE * open_repo_file (const char *filename) { const char *p; const char *s = get_base_filename (filename); if (s == NULL) return NULL; p = lbasename (s); p = strrchr (p, '.'); if (! p) p = s + strlen (s); repo_name = XNEWVEC (char, p - s + 5); memcpy (repo_name, s, p - s); memcpy (repo_name + (p - s), ".rpo", 5); return fopen (repo_name, "r"); } static char * afgets (FILE *stream) { int c; while ((c = getc (stream)) != EOF && c != '\n') obstack_1grow (&temporary_obstack, c); if (obstack_object_size (&temporary_obstack) == 0) return NULL; obstack_1grow (&temporary_obstack, '\0'); return (char *) obstack_finish (&temporary_obstack); } void init_repo (void) { char *buf; const char *p; FILE *repo_file; if (! flag_use_repository) return; /* When a PCH file is loaded, the entire identifier table is replaced, with the result that IDENTIFIER_REPO_CHOSEN is cleared. So, we have to reread the repository file. */ lang_post_pch_load = init_repo; if (!temporary_obstack_initialized_p) gcc_obstack_init (&temporary_obstack); repo_file = open_repo_file (main_input_filename); if (repo_file == 0) return; while ((buf = afgets (repo_file))) { switch (buf[0]) { case 'A': old_args = ggc_strdup (buf + 2); break; case 'D': old_dir = ggc_strdup (buf + 2); break; case 'M': old_main = ggc_strdup (buf + 2); break; case 'O': /* A symbol that we were able to define the last time this file was compiled. */ break; case 'C': /* A symbol that the prelinker has requested that we define. */ { tree id = get_identifier (buf + 2); IDENTIFIER_REPO_CHOSEN (id) = 1; } break; default: error ("mysterious repository information in %s", repo_name); } obstack_free (&temporary_obstack, buf); } fclose (repo_file); if (old_args && !get_random_seed (true) && (p = strstr (old_args, "'-frandom-seed="))) set_random_seed (extract_string (&p) + strlen ("-frandom-seed=")); } static FILE * reopen_repo_file_for_write (void) { FILE *repo_file = fopen (repo_name, "w"); if (repo_file == 0) { error ("can't create repository information file %qs", repo_name); flag_use_repository = 0; } return repo_file; } /* Emit any pending repos. */ void finish_repo (void) { tree t; char *dir, *args; FILE *repo_file; if (!flag_use_repository || flag_compare_debug) return; if (errorcount || sorrycount) return; repo_file = reopen_repo_file_for_write (); if (repo_file == 0) goto out; fprintf (repo_file, "M %s\n", main_input_filename); dir = getpwd (); fprintf (repo_file, "D %s\n", dir); args = getenv ("COLLECT_GCC_OPTIONS"); if (args) { fprintf (repo_file, "A %s", args); /* If -frandom-seed is not among the ARGS, then add the value that we chose. That will ensure that the names of types from anonymous namespaces will get the same mangling when this file is recompiled. */ if (!strstr (args, "'-frandom-seed=")) fprintf (repo_file, " '-frandom-seed=%s'", get_random_seed (false)); fprintf (repo_file, "\n"); } for (t = pending_repo; t; t = TREE_CHAIN (t)) { tree val = TREE_VALUE (t); tree name = DECL_ASSEMBLER_NAME (val); char type = IDENTIFIER_REPO_CHOSEN (name) ? 'C' : 'O'; fprintf (repo_file, "%c %s\n", type, IDENTIFIER_POINTER (name)); } out: if (repo_file) fclose (repo_file); } /* DECL is a FUNCTION_DECL or VAR_DECL with vague linkage whose definition is available in this translation unit. Returns 0 if this definition should not be emitted in this translation unit because it will be emitted elsewhere. Returns 1 if the repository file indicates that that DECL should be emitted in this translation unit, or 2 if the repository file is not in use. */ int repo_emit_p (tree decl) { int ret = 0; gcc_assert (TREE_PUBLIC (decl)); gcc_assert (TREE_CODE (decl) == FUNCTION_DECL || TREE_CODE (decl) == VAR_DECL); gcc_assert (!DECL_REALLY_EXTERN (decl)); /* When not using the repository, emit everything. */ if (!flag_use_repository) return 2; /* Only template instantiations are managed by the repository. This is an artificial restriction; the code in the prelinker and here will work fine if all entities with vague linkage are managed by the repository. */ if (TREE_CODE (decl) == VAR_DECL) { tree type = NULL_TREE; if (DECL_VTABLE_OR_VTT_P (decl)) type = DECL_CONTEXT (decl); else if (DECL_TINFO_P (decl)) type = TREE_TYPE (DECL_NAME (decl)); if (!DECL_TEMPLATE_INSTANTIATION (decl) && (!TYPE_LANG_SPECIFIC (type) || !CLASSTYPE_TEMPLATE_INSTANTIATION (type))) return 2; /* Const static data members initialized by constant expressions must be processed where needed so that their definitions are available. Still record them into *.rpo files, so if they weren't actually emitted and collect2 requests them, they can be provided. */ if (DECL_INTEGRAL_CONSTANT_VAR_P (decl) && DECL_CLASS_SCOPE_P (decl)) ret = 2; } else if (!DECL_TEMPLATE_INSTANTIATION (decl)) return 2; if (DECL_EXPLICIT_INSTANTIATION (decl)) return 2; /* For constructors and destructors, the repository contains information about the clones -- not the original function -- because only the clones are emitted in the object file. */ if (DECL_MAYBE_IN_CHARGE_CONSTRUCTOR_P (decl) || DECL_MAYBE_IN_CHARGE_DESTRUCTOR_P (decl)) { int emit_p = 0; tree clone; /* There is no early exit from this loop because we want to ensure that all of the clones are marked as available in this object file. */ FOR_EACH_CLONE (clone, decl) /* The only possible results from the recursive call to repo_emit_p are 0 or 1. */ if (repo_emit_p (clone)) emit_p = 1; return emit_p; } /* Keep track of all available entities. */ if (!DECL_REPO_AVAILABLE_P (decl)) { DECL_REPO_AVAILABLE_P (decl) = 1; pending_repo = tree_cons (NULL_TREE, decl, pending_repo); } return IDENTIFIER_REPO_CHOSEN (DECL_ASSEMBLER_NAME (decl)) ? 1 : ret; } /* Returns true iff the prelinker has explicitly marked CLASS_TYPE for export from this translation unit. */ bool repo_export_class_p (const_tree class_type) { if (!flag_use_repository) return false; if (!CLASSTYPE_VTABLES (class_type)) return false; /* If the virtual table has been assigned to this translation unit, export the class. */ return (IDENTIFIER_REPO_CHOSEN (DECL_ASSEMBLER_NAME (CLASSTYPE_VTABLES (class_type)))); } #include "gt-cp-repo.h"
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