X-Git-Url: http://drtracing.org/?a=blobdiff_plain;f=ld%2Fplugin.c;h=98a83bc9593e111d0502d339ffa60fdd55c32489;hb=2d95647bdd9a847eaa08d21b848933892ada6f1a;hp=78f2e048bf23fc83abc0f0dc9f7a1992b0ca2e4d;hpb=27b0767593284f97384b3597ebd211164f8c8b47;p=deliverable%2Fbinutils-gdb.git diff --git a/ld/plugin.c b/ld/plugin.c index 78f2e048bf..98a83bc959 100644 --- a/ld/plugin.c +++ b/ld/plugin.c @@ -1,5 +1,5 @@ /* Plugin control for the GNU linker. - Copyright (C) 2010-2018 Free Software Foundation, Inc. + Copyright (C) 2010-2021 Free Software Foundation, Inc. This file is part of the GNU Binutils. @@ -21,8 +21,10 @@ #include "sysdep.h" #include "libiberty.h" #include "bfd.h" +#if BFD_SUPPORTS_PLUGINS #include "bfdlink.h" #include "bfdver.h" +#include "ctf-api.h" #include "ld.h" #include "ldmain.h" #include "ldmisc.h" @@ -54,7 +56,7 @@ extern int errno; #endif /* Report plugin symbols. */ -bfd_boolean report_plugin_symbols; +bool report_plugin_symbols; /* The suffix to append to the name of the real (claimed) object file when generating a dummy BFD to hold the IR symbols sent from the @@ -86,7 +88,7 @@ typedef struct plugin ld_plugin_all_symbols_read_handler all_symbols_read_handler; ld_plugin_cleanup_handler cleanup_handler; /* TRUE if the cleanup handlers have been called. */ - bfd_boolean cleanup_done; + bool cleanup_done; } plugin_t; typedef struct view_buffer @@ -104,7 +106,7 @@ typedef struct plugin_input_file view_buffer_t view_buffer; char *name; int fd; - bfd_boolean use_mmap; + bool use_mmap; off_t offset; off_t filesize; } plugin_input_file_t; @@ -128,7 +130,7 @@ static plugin_t *called_plugin = NULL; static const char *error_plugin = NULL; /* State of linker "notice" interface before we poked at it. */ -static bfd_boolean orig_notice_all; +static bool orig_notice_all; /* Original linker callbacks, and the plugin version. */ static const struct bfd_link_callbacks *orig_callbacks; @@ -136,7 +138,7 @@ static struct bfd_link_callbacks plugin_callbacks; /* Set at all symbols read time, to avoid recursively offering the plugin its own newly-added input files and libs to claim. */ -bfd_boolean no_more_claiming = FALSE; +bool no_more_claiming = false; #if HAVE_MMAP && HAVE_GETPAGESIZE /* Page size used by mmap. */ @@ -169,12 +171,12 @@ static const enum ld_plugin_tag tv_header_tags[] = static const size_t tv_header_size = ARRAY_SIZE (tv_header_tags); /* Forward references. */ -static bfd_boolean plugin_notice (struct bfd_link_info *, - struct bfd_link_hash_entry *, - struct bfd_link_hash_entry *, - bfd *, asection *, bfd_vma, flagword); +static bool plugin_notice (struct bfd_link_info *, + struct bfd_link_hash_entry *, + struct bfd_link_hash_entry *, + bfd *, asection *, bfd_vma, flagword); -static const bfd_target * plugin_object_p (bfd *); +static bfd_cleanup plugin_object_p (bfd *); #if !defined (HAVE_DLFCN_H) && defined (HAVE_WINDOWS_H) @@ -218,7 +220,7 @@ set_plugin_error (const char *plugin) } /* Test if an error occurred. */ -static bfd_boolean +static bool plugin_error_p (void) { return error_plugin != NULL; @@ -307,7 +309,7 @@ static bfd * plugin_get_ir_dummy_bfd (const char *name, bfd *srctemplate) { bfd *abfd; - bfd_boolean bfd_plugin_target; + bool bfd_plugin_target; bfd_use_reserved_id = 1; bfd_plugin_target = bfd_plugin_target_p (srctemplate->xvec); @@ -335,13 +337,13 @@ plugin_get_ir_dummy_bfd (const char *name, bfd *srctemplate) return abfd; } } -report_error: + report_error: einfo (_("%F%P: could not create dummy IR bfd: %E\n")); return NULL; } /* Check if the BFD passed in is an IR dummy object file. */ -static inline bfd_boolean +static inline bool is_ir_dummy_bfd (const bfd *abfd) { /* ABFD can sometimes legitimately be NULL, e.g. when called from one @@ -403,12 +405,6 @@ asymbol_from_plugin_symbol (bfd *abfd, asymbol *asym, flags = BSF_GLOBAL; section = bfd_com_section_ptr; asym->value = ldsym->size; - /* For ELF targets, set alignment of common symbol to 1. */ - if (bfd_get_flavour (abfd) == bfd_target_elf_flavour) - { - ((elf_symbol_type *) asym)->internal_elf_sym.st_shndx = SHN_COMMON; - ((elf_symbol_type *) asym)->internal_elf_sym.st_value = 1; - } break; default: @@ -417,14 +413,20 @@ asymbol_from_plugin_symbol (bfd *abfd, asymbol *asym, asym->flags = flags; asym->section = section; - /* Visibility only applies on ELF targets. */ if (bfd_get_flavour (abfd) == bfd_target_elf_flavour) { - elf_symbol_type *elfsym = elf_symbol_from (abfd, asym); + elf_symbol_type *elfsym = elf_symbol_from (asym); unsigned char visibility; if (!elfsym) einfo (_("%F%P: %s: non-ELF symbol in ELF BFD!\n"), asym->name); + + if (ldsym->def == LDPK_COMMON) + { + elfsym->internal_elf_sym.st_shndx = SHN_COMMON; + elfsym->internal_elf_sym.st_value = 1; + } + switch (ldsym->visibility) { default: @@ -445,9 +447,7 @@ asymbol_from_plugin_symbol (bfd *abfd, asymbol *asym, visibility = STV_HIDDEN; break; } - elfsym->internal_elf_sym.st_other - = (visibility | (elfsym->internal_elf_sym.st_other - & ~ELF_ST_VISIBILITY (-1))); + elfsym->internal_elf_sym.st_other |= visibility; } return LDPS_OK; @@ -563,7 +563,7 @@ get_view (const void *handle, const void **viewp) buffer = mmap (NULL, size, PROT_READ, MAP_PRIVATE, input->fd, offset); if (buffer != MAP_FAILED) { - input->use_mmap = TRUE; + input->use_mmap = true; # if HAVE_GETPAGESIZE buffer += bias; # endif @@ -573,7 +573,7 @@ get_view (const void *handle, const void **viewp) { char *p; - input->use_mmap = FALSE; + input->use_mmap = false; if (lseek (input->fd, offset, SEEK_SET) < 0) return LDPS_ERR; @@ -621,14 +621,12 @@ release_input_file (const void *handle) /* Return TRUE if a defined symbol might be reachable from outside the universe of claimed objects. */ -static inline bfd_boolean +static inline bool is_visible_from_outside (struct ld_plugin_symbol *lsym, struct bfd_link_hash_entry *blhe) { - struct bfd_sym_chain *sym; - if (bfd_link_relocatable (&link_info)) - return TRUE; + return true; if (blhe->non_ir_ref_dynamic || link_info.export_dynamic || bfd_link_dll (&link_info)) @@ -636,9 +634,9 @@ is_visible_from_outside (struct ld_plugin_symbol *lsym, /* Check if symbol is hidden by version script. */ if (bfd_hide_sym_by_version (link_info.version_info, blhe->root.string)) - return FALSE; + return false; /* Only ELF symbols really have visibility. */ - if (bfd_get_flavour (link_info.output_bfd) == bfd_target_elf_flavour) + if (is_elf_hash_table (link_info.hash)) { struct elf_link_hash_entry *el = (struct elf_link_hash_entry *)blhe; int vis = ELF_ST_VISIBILITY (el->other); @@ -658,12 +656,74 @@ is_visible_from_outside (struct ld_plugin_symbol *lsym, || lsym->visibility == LDPV_PROTECTED); } - for (sym = &entry_symbol; sym != NULL; sym = sym->next) - if (sym->name - && strcmp (sym->name, blhe->root.string) == 0) - return TRUE; + return false; +} + +/* Return LTO kind string name that corresponds to IDX enum value. */ +static const char * +get_lto_kind (unsigned int idx) +{ + static char buffer[64]; + const char *lto_kind_str[5] = + { + "DEF", + "WEAKDEF", + "UNDEF", + "WEAKUNDEF", + "COMMON" + }; + + if (idx < ARRAY_SIZE (lto_kind_str)) + return lto_kind_str [idx]; + + sprintf (buffer, _("unknown LTO kind value %x"), idx); + return buffer; +} + +/* Return LTO resolution string name that corresponds to IDX enum value. */ +static const char * +get_lto_resolution (unsigned int idx) +{ + static char buffer[64]; + static const char *lto_resolution_str[10] = + { + "UNKNOWN", + "UNDEF", + "PREVAILING_DEF", + "PREVAILING_DEF_IRONLY", + "PREEMPTED_REG", + "PREEMPTED_IR", + "RESOLVED_IR", + "RESOLVED_EXEC", + "RESOLVED_DYN", + "PREVAILING_DEF_IRONLY_EXP", + }; + + if (idx < ARRAY_SIZE (lto_resolution_str)) + return lto_resolution_str [idx]; + + sprintf (buffer, _("unknown LTO resolution value %x"), idx); + return buffer; +} - return FALSE; +/* Return LTO visibility string name that corresponds to IDX enum value. */ +static const char * +get_lto_visibility (unsigned int idx) +{ + static char buffer[64]; + const char *lto_visibility_str[4] = + { + "DEFAULT", + "PROTECTED", + "INTERNAL", + "HIDDEN" + }; + + if (idx < ARRAY_SIZE (lto_visibility_str)) + return lto_visibility_str [idx]; + + sprintf (buffer, _("unknown LTO visibility value %x"), idx); + return buffer; } /* Get the symbol resolution info for a plugin-claimed input file. */ @@ -681,13 +741,32 @@ get_symbols (const void *handle, int nsyms, struct ld_plugin_symbol *syms, struct bfd_link_hash_entry *blhe; asection *owner_sec; int res; + struct bfd_link_hash_entry *h + = bfd_link_hash_lookup (link_info.hash, syms[n].name, + false, false, true); + enum { wrap_none, wrapper, wrapped } wrap_status = wrap_none; - if (syms[n].def != LDPK_UNDEF) - blhe = bfd_link_hash_lookup (link_info.hash, syms[n].name, - FALSE, FALSE, TRUE); + if (syms[n].def != LDPK_UNDEF && syms[n].def != LDPK_WEAKUNDEF) + { + blhe = h; + if (blhe && link_info.wrap_hash != NULL) + { + /* Check if a symbol is a wrapper symbol. */ + struct bfd_link_hash_entry *unwrap + = unwrap_hash_lookup (&link_info, (bfd *) abfd, blhe); + if (unwrap && unwrap != h) + wrap_status = wrapper; + } + } else - blhe = bfd_wrapped_link_hash_lookup (link_info.output_bfd, &link_info, - syms[n].name, FALSE, FALSE, TRUE); + { + blhe = bfd_wrapped_link_hash_lookup (link_info.output_bfd, + &link_info, syms[n].name, + false, false, true); + /* Check if a symbol is a wrapped symbol. */ + if (blhe && blhe != h) + wrap_status = wrapped; + } if (!blhe) { /* The plugin is called to claim symbols in an archive element @@ -773,9 +852,11 @@ get_symbols (const void *handle, int nsyms, struct ld_plugin_symbol *syms, /* We need to know if the sym is referenced from non-IR files. Or even potentially-referenced, perhaps in a future final link if this is a partial one, perhaps dynamically at load-time if the - symbol is externally visible. */ - if (blhe->non_ir_ref_regular) + symbol is externally visible. Also check for wrapper symbol. */ + if (blhe->non_ir_ref_regular || wrap_status == wrapper) res = LDPR_PREVAILING_DEF; + else if (wrap_status == wrapped) + res = LDPR_RESOLVED_IR; else if (is_visible_from_outside (&syms[n], blhe)) res = def_ironly_exp; } @@ -784,9 +865,11 @@ get_symbols (const void *handle, int nsyms, struct ld_plugin_symbol *syms, syms[n].resolution = res; if (report_plugin_symbols) einfo (_("%P: %pB: symbol `%s' " - "definition: %d, visibility: %d, resolution: %d\n"), + "definition: %s, visibility: %s, resolution: %s\n"), abfd, syms[n].name, - syms[n].def, syms[n].visibility, res); + get_lto_kind (syms[n].def), + get_lto_visibility (syms[n].visibility), + get_lto_resolution (res)); } return LDPS_OK; } @@ -839,7 +922,7 @@ static enum ld_plugin_status set_extra_library_path (const char *path) { ASSERT (called_plugin); - ldfile_add_library_path (xstrdup (path), FALSE); + ldfile_add_library_path (xstrdup (path), false); return LDPS_OK; } @@ -853,14 +936,14 @@ message (int level, const char *format, ...) switch (level) { case LDPL_INFO: - vfinfo (stdout, format, args, FALSE); + vfinfo (stdout, format, args, false); putchar ('\n'); break; case LDPL_WARNING: { char *newfmt = concat (_("%P: warning: "), format, "\n", (const char *) NULL); - vfinfo (stdout, newfmt, args, TRUE); + vfinfo (stdout, newfmt, args, true); free (newfmt); } break; @@ -872,7 +955,7 @@ message (int level, const char *format, ...) _("%P: error: "), format, "\n", (const char *) NULL); fflush (stdout); - vfinfo (stderr, newfmt, args, TRUE); + vfinfo (stderr, newfmt, args, true); fflush (stderr); free (newfmt); } @@ -1032,8 +1115,8 @@ plugin_load_plugins (void) orig_callbacks = link_info.callbacks; plugin_callbacks = *orig_callbacks; plugin_callbacks.notice = &plugin_notice; - link_info.notice_all = TRUE; - link_info.lto_plugin_active = TRUE; + link_info.notice_all = true; + link_info.lto_plugin_active = true; link_info.callbacks = &plugin_callbacks; register_ld_plugin_object_p (plugin_object_p); @@ -1048,7 +1131,7 @@ static int plugin_call_claim_file (const struct ld_plugin_input_file *file, int *claimed) { plugin_t *curplug = plugins_list; - *claimed = FALSE; + *claimed = false; while (curplug && !*claimed) { if (curplug->claim_file_handler) @@ -1082,7 +1165,12 @@ plugin_strdup (bfd *abfd, const char *str) return copy; } -static const bfd_target * +static void +plugin_cleanup (bfd *abfd ATTRIBUTE_UNUSED) +{ +} + +static bfd_cleanup plugin_object_p (bfd *ibfd) { int claimed; @@ -1097,14 +1185,14 @@ plugin_object_p (bfd *ibfd) if (ibfd->plugin_format != bfd_plugin_unknown) { if (ibfd->plugin_format == bfd_plugin_yes) - return ibfd->plugin_dummy_bfd->xvec; + return plugin_cleanup; else return NULL; } /* We create a dummy BFD, initially empty, to house whatever symbols the plugin may want to add. */ - abfd = plugin_get_ir_dummy_bfd (ibfd->filename, ibfd); + abfd = plugin_get_ir_dummy_bfd (bfd_get_filename (ibfd), ibfd); input = bfd_alloc (abfd, sizeof (*input)); if (input == NULL) @@ -1114,7 +1202,7 @@ plugin_object_p (bfd *ibfd) if (!bfd_plugin_open_input (ibfd, &file)) return NULL; - if (file.name == ibfd->filename) + if (file.name == bfd_get_filename (ibfd)) { /* We must copy filename attached to ibfd if it is not an archive member since it may be freed by bfd_close below. */ @@ -1127,10 +1215,10 @@ plugin_object_p (bfd *ibfd) input->view_buffer.filesize = 0; input->view_buffer.offset = 0; input->fd = file.fd; - input->use_mmap = FALSE; + input->use_mmap = false; input->offset = file.offset; input->filesize = file.filesize; - input->name = plugin_strdup (abfd, ibfd->filename); + input->name = plugin_strdup (abfd, bfd_get_filename (ibfd)); claimed = 0; @@ -1157,7 +1245,8 @@ plugin_object_p (bfd *ibfd) ibfd->plugin_format = bfd_plugin_yes; ibfd->plugin_dummy_bfd = abfd; bfd_make_readable (abfd); - return abfd->xvec; + abfd->no_export = ibfd->no_export; + return plugin_cleanup; } else { @@ -1212,7 +1301,7 @@ plugin_call_all_symbols_read (void) plugin_t *curplug = plugins_list; /* Disable any further file-claiming. */ - no_more_claiming = TRUE; + no_more_claiming = true; while (curplug) { @@ -1240,7 +1329,7 @@ plugin_call_cleanup (void) if (curplug->cleanup_handler && !curplug->cleanup_done) { enum ld_plugin_status rv; - curplug->cleanup_done = TRUE; + curplug->cleanup_done = true; called_plugin = curplug; rv = (*curplug->cleanup_handler) (); called_plugin = NULL; @@ -1260,7 +1349,7 @@ plugin_call_cleanup (void) non_ir_ref_dynamic as appropriate. We have to notice_all symbols, because we won't necessarily know until later which ones will be contributed by IR files. */ -static bfd_boolean +static bool plugin_notice (struct bfd_link_info *info, struct bfd_link_hash_entry *h, struct bfd_link_hash_entry *inh, @@ -1274,7 +1363,7 @@ plugin_notice (struct bfd_link_info *info, if (h != NULL) { bfd *sym_bfd; - bfd_boolean ref = FALSE; + bool ref = false; if (h->type == bfd_link_hash_warning) h = h->u.i.link; @@ -1294,13 +1383,13 @@ plugin_notice (struct bfd_link_info *info, || inh->type == bfd_link_hash_new) { if ((abfd->flags & DYNAMIC) == 0) - inh->non_ir_ref_regular = TRUE; + inh->non_ir_ref_regular = true; else - inh->non_ir_ref_dynamic = TRUE; + inh->non_ir_ref_dynamic = true; } if (h->type != bfd_link_hash_new) - ref = TRUE; + ref = true; } /* Nothing to do here for warning symbols. */ @@ -1320,41 +1409,53 @@ plugin_notice (struct bfd_link_info *info, && (h->u.undef.abfd == NULL || (h->u.undef.abfd->flags & BFD_PLUGIN) != 0)) h->u.undef.abfd = abfd; - ref = TRUE; + ref = true; } - /* Otherwise, it must be a new def. */ - else + + /* A common symbol should be merged with other commons or + defs with the same name. In particular, a common ought + to be overridden by a def in a -flto object. In that + sense a common is also a ref. */ + else if (bfd_is_com_section (section)) { - /* Ensure any symbol defined in an IR dummy BFD takes on a - new value from a real BFD. Weak symbols are not normally - overridden by a new weak definition, and strong symbols - will normally cause multiple definition errors. Avoid - this by making the symbol appear to be undefined. */ - if (((h->type == bfd_link_hash_defweak - || h->type == bfd_link_hash_defined) - && is_ir_dummy_bfd (sym_bfd = h->u.def.section->owner)) - || (h->type == bfd_link_hash_common - && is_ir_dummy_bfd (sym_bfd = h->u.c.p->section->owner))) + if (h->type == bfd_link_hash_common + && is_ir_dummy_bfd (sym_bfd = h->u.c.p->section->owner)) { h->type = bfd_link_hash_undefweak; h->u.undef.abfd = sym_bfd; } + ref = true; + } - /* A common symbol should be merged with other commons or - defs with the same name. In particular, a common ought - to be overridden by a def in a -flto object. In that - sense a common is also a ref. */ - if (bfd_is_com_section (section)) - ref = TRUE; + /* Otherwise, it must be a new def. + Ensure any symbol defined in an IR dummy BFD takes on a + new value from a real BFD. Weak symbols are not normally + overridden by a new weak definition, and strong symbols + will normally cause multiple definition errors. Avoid + this by making the symbol appear to be undefined. + + NB: We change the previous definition in the IR object to + undefweak only after all LTO symbols have been read or for + non-ELF targets. */ + else if ((info->lto_all_symbols_read + || bfd_get_flavour (abfd) != bfd_target_elf_flavour) + && (((h->type == bfd_link_hash_defweak + || h->type == bfd_link_hash_defined) + && is_ir_dummy_bfd (sym_bfd = h->u.def.section->owner)) + || (h->type == bfd_link_hash_common + && is_ir_dummy_bfd (sym_bfd = h->u.c.p->section->owner)))) + { + h->type = bfd_link_hash_undefweak; + h->u.undef.abfd = sym_bfd; } if (ref) { if ((abfd->flags & DYNAMIC) == 0) - h->non_ir_ref_regular = TRUE; + h->non_ir_ref_regular = true; else - h->non_ir_ref_dynamic = TRUE; + h->non_ir_ref_dynamic = true; } } @@ -1363,8 +1464,9 @@ plugin_notice (struct bfd_link_info *info, || orig_notice_all || (info->notice_hash != NULL && bfd_hash_lookup (info->notice_hash, orig_h->root.string, - FALSE, FALSE) != NULL)) + false, false) != NULL)) return (*orig_callbacks->notice) (info, orig_h, inh, abfd, section, value, flags); - return TRUE; + return true; } +#endif /* BFD_SUPPORTS_PLUGINS */