diff options
Diffstat (limited to 'gcc-4.8.3/lto-plugin/lto-plugin.c')
| -rw-r--r-- | gcc-4.8.3/lto-plugin/lto-plugin.c | 1053 |
1 files changed, 1053 insertions, 0 deletions
diff --git a/gcc-4.8.3/lto-plugin/lto-plugin.c b/gcc-4.8.3/lto-plugin/lto-plugin.c new file mode 100644 index 000000000..6f31ed273 --- /dev/null +++ b/gcc-4.8.3/lto-plugin/lto-plugin.c @@ -0,0 +1,1053 @@ +/* LTO plugin for gold and/or GNU ld. + Copyright (C) 2009, 2010 Free Software Foundation, Inc. + Contributed by Rafael Avila de Espindola (espindola@google.com). + +This program 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. + +This program 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 this program; see the file COPYING3. If not see +<http://www.gnu.org/licenses/>. */ + +/* The plugin has only one external function: onload. Gold passes it an array of + function that the plugin uses to communicate back to gold. + + With the functions provided by gold, the plugin can be notified when + gold first analyzes a file and pass a symbol table back to gold. The plugin + is also notified when all symbols have been read and it is time to generate + machine code for the necessary symbols. + + More information at http://gcc.gnu.org/wiki/whopr/driver. + + This plugin should be passed the lto-wrapper options and will forward them. + It also has 2 options of its own: + -debug: Print the command line used to run lto-wrapper. + -nop: Instead of running lto-wrapper, pass the original to the plugin. This + only works if the input files are hybrid. */ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif +#if HAVE_STDINT_H +#include <stdint.h> +#endif +#include <assert.h> +#include <string.h> +#include <stdlib.h> +#include <stdio.h> +#include <inttypes.h> +#include <sys/stat.h> +#include <unistd.h> +#include <fcntl.h> +#include <sys/types.h> +#ifdef HAVE_SYS_WAIT_H +#include <sys/wait.h> +#endif +#ifndef WIFEXITED +#define WIFEXITED(S) (((S) & 0xff) == 0) +#endif +#ifndef WEXITSTATUS +#define WEXITSTATUS(S) (((S) & 0xff00) >> 8) +#endif +#include <libiberty.h> +#include <hashtab.h> +#include "../gcc/lto/common.h" +#include "simple-object.h" +#include "plugin-api.h" + +/* We need to use I64 instead of ll width-specifier on native Windows. + The reason for this is that older MS-runtimes don't support the ll. */ +#ifdef __MINGW32__ +#define PRI_LL "I64" +#else +#define PRI_LL "ll" +#endif + +/* Handle opening elf files on hosts, such as Windows, that may use + text file handling that will break binary access. */ +#ifndef O_BINARY +# define O_BINARY 0 +#endif + +/* Segment name for LTO sections. This is only used for Mach-O. + FIXME: This needs to be kept in sync with darwin.c. */ + +#define LTO_SEGMENT_NAME "__GNU_LTO" + +/* LTO magic section name. */ + +#define LTO_SECTION_PREFIX ".gnu.lto_.symtab" +#define LTO_SECTION_PREFIX_LEN (sizeof (LTO_SECTION_PREFIX) - 1) + +/* The part of the symbol table the plugin has to keep track of. Note that we + must keep SYMS until all_symbols_read is called to give the linker time to + copy the symbol information. + The id must be 64bit to minimze collisions. */ + +struct sym_aux +{ + uint32_t slot; + unsigned long long id; + unsigned next_conflict; +}; + +struct plugin_symtab +{ + int nsyms; + struct sym_aux *aux; + struct ld_plugin_symbol *syms; + unsigned long long id; +}; + +/* Encapsulates object file data during symbol scan. */ +struct plugin_objfile +{ + int found; + simple_object_read *objfile; + struct plugin_symtab *out; + const struct ld_plugin_input_file *file; +}; + +/* All that we have to remember about a file. */ + +struct plugin_file_info +{ + char *name; + void *handle; + struct plugin_symtab symtab; + struct plugin_symtab conflicts; +}; + +/* Until ASM_OUTPUT_LABELREF can be hookized and decoupled from + stdio file streams, we do simple label translation here. */ + +enum symbol_style +{ + ss_none, /* No underscore prefix. */ + ss_win32, /* Underscore prefix any symbol not beginning with '@'. */ + ss_uscore, /* Underscore prefix all symbols. */ +}; + +static char *arguments_file_name; +static ld_plugin_register_claim_file register_claim_file; +static ld_plugin_register_all_symbols_read register_all_symbols_read; +static ld_plugin_get_symbols get_symbols, get_symbols_v2; +static ld_plugin_register_cleanup register_cleanup; +static ld_plugin_add_input_file add_input_file; +static ld_plugin_add_input_library add_input_library; +static ld_plugin_message message; +static ld_plugin_add_symbols add_symbols; + +static struct plugin_file_info *claimed_files = NULL; +static unsigned int num_claimed_files = 0; + +static char **output_files = NULL; +static unsigned int num_output_files = 0; + +static char **lto_wrapper_argv; +static int lto_wrapper_num_args; + +static char **pass_through_items = NULL; +static unsigned int num_pass_through_items; + +static char debug; +static char nop; +static char *resolution_file = NULL; + +/* The version of gold being used, or -1 if not gold. The number is + MAJOR * 100 + MINOR. */ +static int gold_version = -1; + +/* Not used by default, but can be overridden at runtime + by using -plugin-opt=-sym-style={none,win32,underscore|uscore} + (in fact, only first letter of style arg is checked.) */ +static enum symbol_style sym_style = ss_none; + +static void +check_1 (int gate, enum ld_plugin_level level, const char *text) +{ + if (gate) + return; + + if (message) + message (level, text); + else + { + /* If there is no nicer way to inform the user, fallback to stderr. */ + fprintf (stderr, "%s\n", text); + if (level == LDPL_FATAL) + abort (); + } +} + +/* This little wrapper allows check to be called with a non-integer + first argument, such as a pointer that must be non-NULL. We can't + use c99 bool type to coerce it into range, so we explicitly test. */ +#define check(GATE, LEVEL, TEXT) check_1 (((GATE) != 0), (LEVEL), (TEXT)) + +/* Parse an entry of the IL symbol table. The data to be parsed is pointed + by P and the result is written in ENTRY. The slot number is stored in SLOT. + Returns the address of the next entry. */ + +static char * +parse_table_entry (char *p, struct ld_plugin_symbol *entry, + struct sym_aux *aux) +{ + unsigned char t; + enum ld_plugin_symbol_kind translate_kind[] = + { + LDPK_DEF, + LDPK_WEAKDEF, + LDPK_UNDEF, + LDPK_WEAKUNDEF, + LDPK_COMMON + }; + + enum ld_plugin_symbol_visibility translate_visibility[] = + { + LDPV_DEFAULT, + LDPV_PROTECTED, + LDPV_INTERNAL, + LDPV_HIDDEN + }; + + switch (sym_style) + { + case ss_win32: + if (p[0] == '@') + { + /* cf. Duff's device. */ + case ss_none: + entry->name = xstrdup (p); + break; + } + /* FALL-THROUGH. */ + case ss_uscore: + entry->name = concat ("_", p, NULL); + break; + default: + check (0, LDPL_FATAL, "invalid symbol style requested"); + break; + } + while (*p) + p++; + p++; + + entry->version = NULL; + + entry->comdat_key = p; + while (*p) + p++; + p++; + + if (strlen (entry->comdat_key) == 0) + entry->comdat_key = NULL; + else + entry->comdat_key = xstrdup (entry->comdat_key); + + t = *p; + check (t <= 4, LDPL_FATAL, "invalid symbol kind found"); + entry->def = translate_kind[t]; + p++; + + t = *p; + check (t <= 3, LDPL_FATAL, "invalid symbol visibility found"); + entry->visibility = translate_visibility[t]; + p++; + + memcpy (&entry->size, p, sizeof (uint64_t)); + p += 8; + + memcpy (&aux->slot, p, sizeof (uint32_t)); + p += 4; + + entry->resolution = LDPR_UNKNOWN; + + aux->next_conflict = -1; + + return p; +} + +/* Translate the IL symbol table located between DATA and END. Append the + slots and symbols to OUT. */ + +static void +translate (char *data, char *end, struct plugin_symtab *out) +{ + struct sym_aux *aux; + struct ld_plugin_symbol *syms = NULL; + int n, len; + + /* This overestimates the output buffer sizes, but at least + the algorithm is O(1) now. */ + + len = (end - data)/8 + out->nsyms + 1; + syms = xrealloc (out->syms, len * sizeof (struct ld_plugin_symbol)); + aux = xrealloc (out->aux, len * sizeof (struct sym_aux)); + + for (n = out->nsyms; data < end; n++) + { + aux[n].id = out->id; + data = parse_table_entry (data, &syms[n], &aux[n]); + } + + assert(n < len); + + out->nsyms = n; + out->syms = syms; + out->aux = aux; +} + +/* Free all memory that is no longer needed after writing the symbol + resolution. */ + +static void +free_1 (void) +{ + unsigned int i; + for (i = 0; i < num_claimed_files; i++) + { + struct plugin_file_info *info = &claimed_files[i]; + struct plugin_symtab *symtab = &info->symtab; + unsigned int j; + for (j = 0; j < symtab->nsyms; j++) + { + struct ld_plugin_symbol *s = &symtab->syms[j]; + free (s->name); + free (s->comdat_key); + } + free (symtab->syms); + symtab->syms = NULL; + } +} + +/* Free all remaining memory. */ + +static void +free_2 (void) +{ + unsigned int i; + for (i = 0; i < num_claimed_files; i++) + { + struct plugin_file_info *info = &claimed_files[i]; + struct plugin_symtab *symtab = &info->symtab; + free (symtab->aux); + free (info->name); + } + + for (i = 0; i < num_output_files; i++) + free (output_files[i]); + free (output_files); + + free (claimed_files); + claimed_files = NULL; + num_claimed_files = 0; + + free (arguments_file_name); + arguments_file_name = NULL; +} + +/* Dump SYMTAB to resolution file F. */ + +static void +dump_symtab (FILE *f, struct plugin_symtab *symtab) +{ + unsigned j; + + for (j = 0; j < symtab->nsyms; j++) + { + uint32_t slot = symtab->aux[j].slot; + unsigned int resolution = symtab->syms[j].resolution; + + assert (resolution != LDPR_UNKNOWN); + + fprintf (f, "%u %" PRI_LL "x %s %s\n", + (unsigned int) slot, symtab->aux[j].id, + lto_resolution_str[resolution], + symtab->syms[j].name); + } +} + +/* Finish the conflicts' resolution information after the linker resolved + the original symbols */ + +static void +finish_conflict_resolution (struct plugin_symtab *symtab, + struct plugin_symtab *conflicts) +{ + int i, j; + + if (conflicts->nsyms == 0) + return; + + for (i = 0; i < symtab->nsyms; i++) + { + int resolution = LDPR_UNKNOWN; + + if (symtab->aux[i].next_conflict == -1) + continue; + + switch (symtab->syms[i].def) + { + case LDPK_DEF: + case LDPK_COMMON: /* ??? */ + resolution = LDPR_RESOLVED_IR; + break; + case LDPK_WEAKDEF: + resolution = LDPR_PREEMPTED_IR; + break; + case LDPK_UNDEF: + case LDPK_WEAKUNDEF: + resolution = symtab->syms[i].resolution; + break; + default: + assert (0); + } + + assert (resolution != LDPR_UNKNOWN); + + for (j = symtab->aux[i].next_conflict; + j != -1; + j = conflicts->aux[j].next_conflict) + conflicts->syms[j].resolution = resolution; + } +} + +/* Free symbol table SYMTAB. */ + +static void +free_symtab (struct plugin_symtab *symtab) +{ + free (symtab->syms); + symtab->syms = NULL; + free (symtab->aux); + symtab->aux = NULL; +} + +/* Writes the relocations to disk. */ + +static void +write_resolution (void) +{ + unsigned int i; + FILE *f; + + check (resolution_file, LDPL_FATAL, "resolution file not specified"); + f = fopen (resolution_file, "w"); + check (f, LDPL_FATAL, "could not open file"); + + fprintf (f, "%d\n", num_claimed_files); + + for (i = 0; i < num_claimed_files; i++) + { + struct plugin_file_info *info = &claimed_files[i]; + struct plugin_symtab *symtab = &info->symtab; + struct ld_plugin_symbol *syms = symtab->syms; + + /* Version 2 of API supports IRONLY_EXP resolution that is + accepted by GCC-4.7 and newer. */ + if (get_symbols_v2) + get_symbols_v2 (info->handle, symtab->nsyms, syms); + else + get_symbols (info->handle, symtab->nsyms, syms); + + finish_conflict_resolution (symtab, &info->conflicts); + + fprintf (f, "%s %d\n", info->name, symtab->nsyms + info->conflicts.nsyms); + dump_symtab (f, symtab); + if (info->conflicts.nsyms) + { + dump_symtab (f, &info->conflicts); + free_symtab (&info->conflicts); + } + } + fclose (f); +} + +/* Pass files generated by the lto-wrapper to the linker. FD is lto-wrapper's + stdout. */ + +static void +add_output_files (FILE *f) +{ + for (;;) + { + const unsigned piece = 32; + char *buf, *s = xmalloc (piece); + size_t len; + + buf = s; +cont: + if (!fgets (buf, piece, f)) + { + free (s); + break; + } + len = strlen (s); + if (s[len - 1] != '\n') + { + s = xrealloc (s, len + piece); + buf = s + len; + goto cont; + } + s[len - 1] = '\0'; + + num_output_files++; + output_files + = xrealloc (output_files, num_output_files * sizeof (char *)); + output_files[num_output_files - 1] = s; + add_input_file (output_files[num_output_files - 1]); + } +} + +/* Execute the lto-wrapper. ARGV[0] is the binary. The rest of ARGV is the + argument list. */ + +static void +exec_lto_wrapper (char *argv[]) +{ + int t, i; + int status; + char *at_args; + FILE *args; + FILE *wrapper_output; + char *new_argv[3]; + struct pex_obj *pex; + const char *errmsg; + + /* Write argv to a file to avoid a command line that is too long. */ + arguments_file_name = make_temp_file (""); + check (arguments_file_name, LDPL_FATAL, + "Failed to generate a temorary file name"); + + args = fopen (arguments_file_name, "w"); + check (args, LDPL_FATAL, "could not open arguments file"); + + t = writeargv (&argv[1], args); + check (t == 0, LDPL_FATAL, "could not write arguments"); + t = fclose (args); + check (t == 0, LDPL_FATAL, "could not close arguments file"); + + at_args = concat ("@", arguments_file_name, NULL); + check (at_args, LDPL_FATAL, "could not allocate"); + + for (i = 1; argv[i]; i++) + { + char *a = argv[i]; + if (a[0] == '-' && a[1] == 'v' && a[2] == '\0') + { + for (i = 0; argv[i]; i++) + fprintf (stderr, "%s ", argv[i]); + fprintf (stderr, "\n"); + break; + } + } + + new_argv[0] = argv[0]; + new_argv[1] = at_args; + new_argv[2] = NULL; + + if (debug) + { + for (i = 0; new_argv[i]; i++) + fprintf (stderr, "%s ", new_argv[i]); + fprintf (stderr, "\n"); + } + + + pex = pex_init (PEX_USE_PIPES, "lto-wrapper", NULL); + check (pex != NULL, LDPL_FATAL, "could not pex_init lto-wrapper"); + + errmsg = pex_run (pex, 0, new_argv[0], new_argv, NULL, NULL, &t); + check (errmsg == NULL, LDPL_FATAL, "could not run lto-wrapper"); + check (t == 0, LDPL_FATAL, "could not run lto-wrapper"); + + wrapper_output = pex_read_output (pex, 0); + check (wrapper_output, LDPL_FATAL, "could not read lto-wrapper output"); + + add_output_files (wrapper_output); + + t = pex_get_status (pex, 1, &status); + check (t == 1, LDPL_FATAL, "could not get lto-wrapper exit status"); + check (WIFEXITED (status) && WEXITSTATUS (status) == 0, LDPL_FATAL, + "lto-wrapper failed"); + + pex_free (pex); + + free (at_args); +} + +/* Pass the original files back to the linker. */ + +static void +use_original_files (void) +{ + unsigned i; + for (i = 0; i < num_claimed_files; i++) + { + struct plugin_file_info *info = &claimed_files[i]; + add_input_file (info->name); + } +} + + +/* Called by the linker once all symbols have been read. */ + +static enum ld_plugin_status +all_symbols_read_handler (void) +{ + unsigned i; + unsigned num_lto_args = num_claimed_files + lto_wrapper_num_args + 1; + char **lto_argv; + const char **lto_arg_ptr; + if (num_claimed_files == 0) + return LDPS_OK; + + if (nop) + { + use_original_files (); + return LDPS_OK; + } + + lto_argv = (char **) xcalloc (sizeof (char *), num_lto_args); + lto_arg_ptr = (const char **) lto_argv; + assert (lto_wrapper_argv); + + write_resolution (); + + free_1 (); + + for (i = 0; i < lto_wrapper_num_args; i++) + *lto_arg_ptr++ = lto_wrapper_argv[i]; + + for (i = 0; i < num_claimed_files; i++) + { + struct plugin_file_info *info = &claimed_files[i]; + + *lto_arg_ptr++ = info->name; + } + + *lto_arg_ptr++ = NULL; + exec_lto_wrapper (lto_argv); + + free (lto_argv); + + /* --pass-through is not needed when using gold 1.11 or later. */ + if (pass_through_items && gold_version < 111) + { + unsigned int i; + for (i = 0; i < num_pass_through_items; i++) + { + if (strncmp (pass_through_items[i], "-l", 2) == 0) + add_input_library (pass_through_items[i] + 2); + else + add_input_file (pass_through_items[i]); + free (pass_through_items[i]); + pass_through_items[i] = NULL; + } + free (pass_through_items); + pass_through_items = NULL; + } + + return LDPS_OK; +} + +/* Remove temporary files at the end of the link. */ + +static enum ld_plugin_status +cleanup_handler (void) +{ + unsigned int i; + int t; + + if (debug) + return LDPS_OK; + + if (arguments_file_name) + { + t = unlink (arguments_file_name); + check (t == 0, LDPL_FATAL, "could not unlink arguments file"); + } + + for (i = 0; i < num_output_files; i++) + { + t = unlink (output_files[i]); + check (t == 0, LDPL_FATAL, "could not unlink output file"); + } + + free_2 (); + return LDPS_OK; +} + +#define SWAP(type, a, b) \ + do { type tmp_; tmp_ = (a); (a) = (b); (b) = tmp_; } while(0) + +/* Compare two hash table entries */ + +static int eq_sym (const void *a, const void *b) +{ + const struct ld_plugin_symbol *as = (const struct ld_plugin_symbol *)a; + const struct ld_plugin_symbol *bs = (const struct ld_plugin_symbol *)b; + + return !strcmp (as->name, bs->name); +} + +/* Hash a symbol */ + +static hashval_t hash_sym (const void *a) +{ + const struct ld_plugin_symbol *as = (const struct ld_plugin_symbol *)a; + + return htab_hash_string (as->name); +} + +/* Determine how strong a symbol is */ + +static int symbol_strength (struct ld_plugin_symbol *s) +{ + switch (s->def) + { + case LDPK_UNDEF: + case LDPK_WEAKUNDEF: + return 0; + case LDPK_WEAKDEF: + return 1; + default: + return 2; + } +} + +/* In the ld -r case we can get dups in the LTO symbol tables, where + the same symbol can have different resolutions (e.g. undefined and defined). + + We have to keep that in the LTO symbol tables, but the dups confuse + gold and then finally gcc by supplying incorrect resolutions. + + Problem is that the main gold symbol table doesn't know about subids + and does not distingush the same symbols in different states. + + So we drop duplicates from the linker visible symbol table + and keep them in a private table. Then later do own symbol + resolution for the duplicated based on the results for the + originals. + + Then when writing out the resolution file readd the dropped symbols. + + XXX how to handle common? */ + +static void +resolve_conflicts (struct plugin_symtab *t, struct plugin_symtab *conflicts) +{ + htab_t symtab = htab_create (t->nsyms, hash_sym, eq_sym, NULL); + int i; + int out; + int outlen; + + outlen = t->nsyms; + conflicts->syms = xmalloc (sizeof (struct ld_plugin_symbol) * outlen); + conflicts->aux = xmalloc (sizeof (struct sym_aux) * outlen); + + /* Move all duplicate symbols into the auxiliary conflicts table. */ + out = 0; + for (i = 0; i < t->nsyms; i++) + { + struct ld_plugin_symbol *s = &t->syms[i]; + struct sym_aux *aux = &t->aux[i]; + void **slot; + + slot = htab_find_slot (symtab, s, INSERT); + if (*slot != NULL) + { + int cnf; + struct ld_plugin_symbol *orig = (struct ld_plugin_symbol *)*slot; + struct sym_aux *orig_aux = &t->aux[orig - t->syms]; + + /* Always let the linker resolve the strongest symbol */ + if (symbol_strength (orig) < symbol_strength (s)) + { + SWAP (struct ld_plugin_symbol, *orig, *s); + SWAP (uint32_t, orig_aux->slot, aux->slot); + SWAP (unsigned long long, orig_aux->id, aux->id); + /* Don't swap conflict chain pointer */ + } + + /* Move current symbol into the conflicts table */ + cnf = conflicts->nsyms++; + conflicts->syms[cnf] = *s; + conflicts->aux[cnf] = *aux; + aux = &conflicts->aux[cnf]; + + /* Update conflicts chain of the original symbol */ + aux->next_conflict = orig_aux->next_conflict; + orig_aux->next_conflict = cnf; + + continue; + } + + /* Remove previous duplicates in the main table */ + if (out < i) + { + t->syms[out] = *s; + t->aux[out] = *aux; + } + + /* Put original into the hash table */ + *slot = &t->syms[out]; + out++; + } + + assert (conflicts->nsyms <= outlen); + assert (conflicts->nsyms + out == t->nsyms); + + t->nsyms = out; + htab_delete (symtab); +} + +/* Process one section of an object file. */ + +static int +process_symtab (void *data, const char *name, off_t offset, off_t length) +{ + struct plugin_objfile *obj = (struct plugin_objfile *)data; + char *s; + char *secdata; + + if (strncmp (name, LTO_SECTION_PREFIX, LTO_SECTION_PREFIX_LEN) != 0) + return 1; + + s = strrchr (name, '.'); + if (s) + sscanf (s, ".%" PRI_LL "x", &obj->out->id); + secdata = xmalloc (length); + offset += obj->file->offset; + if (offset != lseek (obj->file->fd, offset, SEEK_SET) + || length != read (obj->file->fd, secdata, length)) + { + if (message) + message (LDPL_FATAL, "%s: corrupt object file", obj->file->name); + /* Force claim_file_handler to abandon this file. */ + obj->found = 0; + free (secdata); + return 0; + } + + translate (secdata, secdata + length, obj->out); + obj->found++; + free (secdata); + return 1; +} + +/* Callback used by gold to check if the plugin will claim FILE. Writes + the result in CLAIMED. */ + +static enum ld_plugin_status +claim_file_handler (const struct ld_plugin_input_file *file, int *claimed) +{ + enum ld_plugin_status status; + struct plugin_objfile obj; + struct plugin_file_info lto_file; + int err; + const char *errmsg; + + memset (<o_file, 0, sizeof (struct plugin_file_info)); + + if (file->offset != 0) + { + char *objname; + /* We pass the offset of the actual file, not the archive header. + Can't use PRIx64, because that's C99, so we have to print the + 64-bit hex int as two 32-bit ones. */ + int lo, hi, t; + lo = file->offset & 0xffffffff; + hi = ((int64_t)file->offset >> 32) & 0xffffffff; + t = hi ? asprintf (&objname, "%s@0x%x%08x", file->name, lo, hi) + : asprintf (&objname, "%s@0x%x", file->name, lo); + check (t >= 0, LDPL_FATAL, "asprintf failed"); + lto_file.name = objname; + } + else + { + lto_file.name = xstrdup (file->name); + } + lto_file.handle = file->handle; + + *claimed = 0; + obj.file = file; + obj.found = 0; + obj.out = <o_file.symtab; + errmsg = NULL; + obj.objfile = simple_object_start_read (file->fd, file->offset, LTO_SEGMENT_NAME, + &errmsg, &err); + /* No file, but also no error code means unrecognized format; just skip it. */ + if (!obj.objfile && !err) + goto err; + + if (obj.objfile) + errmsg = simple_object_find_sections (obj.objfile, process_symtab, &obj, &err); + + if (!obj.objfile || errmsg) + { + if (err && message) + message (LDPL_FATAL, "%s: %s: %s", file->name, errmsg, + xstrerror (err)); + else if (message) + message (LDPL_FATAL, "%s: %s", file->name, errmsg); + goto err; + } + + if (obj.found == 0) + goto err; + + if (obj.found > 1) + resolve_conflicts (<o_file.symtab, <o_file.conflicts); + + status = add_symbols (file->handle, lto_file.symtab.nsyms, + lto_file.symtab.syms); + check (status == LDPS_OK, LDPL_FATAL, "could not add symbols"); + + *claimed = 1; + num_claimed_files++; + claimed_files = + xrealloc (claimed_files, + num_claimed_files * sizeof (struct plugin_file_info)); + claimed_files[num_claimed_files - 1] = lto_file; + + goto cleanup; + + err: + free (lto_file.name); + + cleanup: + if (obj.objfile) + simple_object_release_read (obj.objfile); + + return LDPS_OK; +} + +/* Parse the plugin options. */ + +static void +process_option (const char *option) +{ + if (strcmp (option, "-debug") == 0) + debug = 1; + else if (strcmp (option, "-nop") == 0) + nop = 1; + else if (!strncmp (option, "-pass-through=", strlen("-pass-through="))) + { + num_pass_through_items++; + pass_through_items = xrealloc (pass_through_items, + num_pass_through_items * sizeof (char *)); + pass_through_items[num_pass_through_items - 1] = + xstrdup (option + strlen ("-pass-through=")); + } + else if (!strncmp (option, "-sym-style=", sizeof ("-sym-style=") - 1)) + { + switch (option[sizeof ("-sym-style=") - 1]) + { + case 'w': + sym_style = ss_win32; + break; + case 'u': + sym_style = ss_uscore; + break; + default: + sym_style = ss_none; + break; + } + } + else + { + int size; + char *opt = xstrdup (option); + lto_wrapper_num_args += 1; + size = lto_wrapper_num_args * sizeof (char *); + lto_wrapper_argv = (char **) xrealloc (lto_wrapper_argv, size); + lto_wrapper_argv[lto_wrapper_num_args - 1] = opt; + if (strncmp (option, "-fresolution=", sizeof ("-fresolution=") - 1) == 0) + resolution_file = opt + sizeof ("-fresolution=") - 1; + } +} + +/* Called by gold after loading the plugin. TV is the transfer vector. */ + +enum ld_plugin_status +onload (struct ld_plugin_tv *tv) +{ + struct ld_plugin_tv *p; + enum ld_plugin_status status; + + p = tv; + while (p->tv_tag) + { + switch (p->tv_tag) + { + case LDPT_MESSAGE: + message = p->tv_u.tv_message; + break; + case LDPT_REGISTER_CLAIM_FILE_HOOK: + register_claim_file = p->tv_u.tv_register_claim_file; + break; + case LDPT_ADD_SYMBOLS: + add_symbols = p->tv_u.tv_add_symbols; + break; + case LDPT_REGISTER_ALL_SYMBOLS_READ_HOOK: + register_all_symbols_read = p->tv_u.tv_register_all_symbols_read; + break; + case LDPT_GET_SYMBOLS_V2: + get_symbols_v2 = p->tv_u.tv_get_symbols; + break; + case LDPT_GET_SYMBOLS: + get_symbols = p->tv_u.tv_get_symbols; + break; + case LDPT_REGISTER_CLEANUP_HOOK: + register_cleanup = p->tv_u.tv_register_cleanup; + break; + case LDPT_ADD_INPUT_FILE: + add_input_file = p->tv_u.tv_add_input_file; + break; + case LDPT_ADD_INPUT_LIBRARY: + add_input_library = p->tv_u.tv_add_input_library; + break; + case LDPT_OPTION: + process_option (p->tv_u.tv_string); + break; + case LDPT_GOLD_VERSION: + gold_version = p->tv_u.tv_val; + break; + default: + break; + } + p++; + } + + check (register_claim_file, LDPL_FATAL, "register_claim_file not found"); + check (add_symbols, LDPL_FATAL, "add_symbols not found"); + status = register_claim_file (claim_file_handler); + check (status == LDPS_OK, LDPL_FATAL, + "could not register the claim_file callback"); + + if (register_cleanup) + { + status = register_cleanup (cleanup_handler); + check (status == LDPS_OK, LDPL_FATAL, + "could not register the cleanup callback"); + } + + if (register_all_symbols_read) + { + check (get_symbols, LDPL_FATAL, "get_symbols not found"); + status = register_all_symbols_read (all_symbols_read_handler); + check (status == LDPS_OK, LDPL_FATAL, + "could not register the all_symbols_read callback"); + } + + return LDPS_OK; +} |