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Diffstat (limited to 'binutils-2.25/gold/archive.cc')
| -rw-r--r-- | binutils-2.25/gold/archive.cc | 1313 |
1 files changed, 1313 insertions, 0 deletions
diff --git a/binutils-2.25/gold/archive.cc b/binutils-2.25/gold/archive.cc new file mode 100644 index 00000000..53d88a23 --- /dev/null +++ b/binutils-2.25/gold/archive.cc @@ -0,0 +1,1313 @@ +// archive.cc -- archive support for gold + +// Copyright 2006, 2007, 2008, 2009, 2010, 2011, 2013 +// Free Software Foundation, Inc. +// Written by Ian Lance Taylor <iant@google.com>. + +// This file is part of gold. + +// 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 of the License, 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; if not, write to the Free Software +// Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, +// MA 02110-1301, USA. + +#include "gold.h" + +#include <cerrno> +#include <cstring> +#include <climits> +#include <vector> +#include "libiberty.h" +#include "filenames.h" + +#include "elfcpp.h" +#include "options.h" +#include "mapfile.h" +#include "fileread.h" +#include "readsyms.h" +#include "symtab.h" +#include "object.h" +#include "layout.h" +#include "archive.h" +#include "plugin.h" +#include "incremental.h" + +namespace gold +{ + +// Library_base methods. + +// Determine whether a definition of SYM_NAME should cause an archive +// library member to be included in the link. Returns SHOULD_INCLUDE_YES +// if the symbol is referenced but not defined, SHOULD_INCLUDE_NO if the +// symbol is already defined, and SHOULD_INCLUDE_UNKNOWN if the symbol is +// neither referenced nor defined. + +Library_base::Should_include +Library_base::should_include_member(Symbol_table* symtab, Layout* layout, + const char* sym_name, Symbol** symp, + std::string* why, char** tmpbufp, + size_t* tmpbuflen) +{ + // In an object file, and therefore in an archive map, an + // '@' in the name separates the symbol name from the + // version name. If there are two '@' characters, this is + // the default version. + char* tmpbuf = *tmpbufp; + const char* ver = strchr(sym_name, '@'); + bool def = false; + if (ver != NULL) + { + size_t symlen = ver - sym_name; + if (symlen + 1 > *tmpbuflen) + { + tmpbuf = static_cast<char*>(xrealloc(tmpbuf, symlen + 1)); + *tmpbufp = tmpbuf; + *tmpbuflen = symlen + 1; + } + memcpy(tmpbuf, sym_name, symlen); + tmpbuf[symlen] = '\0'; + sym_name = tmpbuf; + + ++ver; + if (*ver == '@') + { + ++ver; + def = true; + } + } + + Symbol* sym = symtab->lookup(sym_name, ver); + if (def + && ver != NULL + && (sym == NULL + || !sym->is_undefined() + || sym->binding() == elfcpp::STB_WEAK)) + sym = symtab->lookup(sym_name, NULL); + + *symp = sym; + + if (sym == NULL) + { + // Check whether the symbol was named in a -u option. + if (parameters->options().is_undefined(sym_name)) + { + *why = "-u "; + *why += sym_name; + } + else if (parameters->options().is_export_dynamic_symbol(sym_name)) + { + *why = "--export-dynamic-symbol "; + *why += sym_name; + } + else if (layout->script_options()->is_referenced(sym_name)) + { + size_t alc = 100 + strlen(sym_name); + char* buf = new char[alc]; + snprintf(buf, alc, _("script or expression reference to %s"), + sym_name); + *why = buf; + delete[] buf; + } + else if (strcmp(sym_name, parameters->entry()) == 0) + { + *why = "entry symbol "; + *why += sym_name; + } + else + return Library_base::SHOULD_INCLUDE_UNKNOWN; + } + else if (!sym->is_undefined()) + return Library_base::SHOULD_INCLUDE_NO; + // PR 12001: Do not include an archive when the undefined + // symbol has actually been defined on the command line. + else if (layout->script_options()->is_pending_assignment(sym_name)) + return Library_base::SHOULD_INCLUDE_NO; + else if (sym->binding() == elfcpp::STB_WEAK) + return Library_base::SHOULD_INCLUDE_UNKNOWN; + + return Library_base::SHOULD_INCLUDE_YES; +} + +// The header of an entry in the archive. This is all readable text, +// padded with spaces where necessary. If the contents of an archive +// are all text file, the entire archive is readable. + +struct Archive::Archive_header +{ + // The entry name. + char ar_name[16]; + // The file modification time. + char ar_date[12]; + // The user's UID in decimal. + char ar_uid[6]; + // The user's GID in decimal. + char ar_gid[6]; + // The file mode in octal. + char ar_mode[8]; + // The file size in decimal. + char ar_size[10]; + // The final magic code. + char ar_fmag[2]; +}; + +// Class Archive static variables. +unsigned int Archive::total_archives; +unsigned int Archive::total_members; +unsigned int Archive::total_members_loaded; + +// Archive methods. + +const char Archive::armag[sarmag] = +{ + '!', '<', 'a', 'r', 'c', 'h', '>', '\n' +}; + +const char Archive::armagt[sarmag] = +{ + '!', '<', 't', 'h', 'i', 'n', '>', '\n' +}; + +const char Archive::arfmag[2] = { '`', '\n' }; + +Archive::Archive(const std::string& name, Input_file* input_file, + bool is_thin_archive, Dirsearch* dirpath, Task* task) + : Library_base(task), name_(name), input_file_(input_file), armap_(), + armap_names_(), extended_names_(), armap_checked_(), seen_offsets_(), + members_(), is_thin_archive_(is_thin_archive), included_member_(false), + nested_archives_(), dirpath_(dirpath), num_members_(0), + included_all_members_(false) +{ + this->no_export_ = + parameters->options().check_excluded_libs(input_file->found_name()); +} + +// Set up the archive: read the symbol map and the extended name +// table. + +void +Archive::setup() +{ + // We need to ignore empty archives. + if (this->input_file_->file().filesize() == sarmag) + return; + + // The first member of the archive should be the symbol table. + std::string armap_name; + off_t header_size = this->read_header(sarmag, false, &armap_name, NULL); + if (header_size == -1) + return; + + section_size_type armap_size = convert_to_section_size_type(header_size); + off_t off = sarmag; + if (armap_name.empty()) + { + this->read_armap(sarmag + sizeof(Archive_header), armap_size); + off = sarmag + sizeof(Archive_header) + armap_size; + } + else if (!this->input_file_->options().whole_archive()) + gold_error(_("%s: no archive symbol table (run ranlib)"), + this->name().c_str()); + + // See if there is an extended name table. We cache these views + // because it is likely that we will want to read the following + // header in the add_symbols routine. + if ((off & 1) != 0) + ++off; + std::string xname; + header_size = this->read_header(off, true, &xname, NULL); + if (header_size == -1) + return; + + section_size_type extended_size = convert_to_section_size_type(header_size); + if (xname == "/") + { + const unsigned char* p = this->get_view(off + sizeof(Archive_header), + extended_size, false, true); + const char* px = reinterpret_cast<const char*>(p); + this->extended_names_.assign(px, extended_size); + } + bool preread_syms = (parameters->options().threads() + && parameters->options().preread_archive_symbols()); +#ifndef ENABLE_THREADS + preread_syms = false; +#else + if (parameters->options().has_plugins()) + preread_syms = false; +#endif + if (preread_syms) + this->read_all_symbols(); +} + +// Unlock any nested archives. + +void +Archive::unlock_nested_archives() +{ + for (Nested_archive_table::iterator p = this->nested_archives_.begin(); + p != this->nested_archives_.end(); + ++p) + { + p->second->unlock(this->task_); + } +} + +// Read the archive symbol map. + +void +Archive::read_armap(off_t start, section_size_type size) +{ + // To count the total number of archive members, we'll just count + // the number of times the file offset changes. Since most archives + // group the symbols in the armap by object, this ought to give us + // an accurate count. + off_t last_seen_offset = -1; + + // Read in the entire armap. + const unsigned char* p = this->get_view(start, size, true, false); + + // Numbers in the armap are always big-endian. + const elfcpp::Elf_Word* pword = reinterpret_cast<const elfcpp::Elf_Word*>(p); + unsigned int nsyms = elfcpp::Swap<32, true>::readval(pword); + ++pword; + + // Note that the addition is in units of sizeof(elfcpp::Elf_Word). + const char* pnames = reinterpret_cast<const char*>(pword + nsyms); + section_size_type names_size = + reinterpret_cast<const char*>(p) + size - pnames; + this->armap_names_.assign(pnames, names_size); + + this->armap_.resize(nsyms); + + section_offset_type name_offset = 0; + for (unsigned int i = 0; i < nsyms; ++i) + { + this->armap_[i].name_offset = name_offset; + this->armap_[i].file_offset = elfcpp::Swap<32, true>::readval(pword); + name_offset += strlen(pnames + name_offset) + 1; + ++pword; + if (this->armap_[i].file_offset != last_seen_offset) + { + last_seen_offset = this->armap_[i].file_offset; + ++this->num_members_; + } + } + + if (static_cast<section_size_type>(name_offset) > names_size) + gold_error(_("%s: bad archive symbol table names"), + this->name().c_str()); + + // This array keeps track of which symbols are for archive elements + // which we have already included in the link. + this->armap_checked_.resize(nsyms); +} + +// Read the header of an archive member at OFF. Fail if something +// goes wrong. Return the size of the member. Set *PNAME to the name +// of the member. + +off_t +Archive::read_header(off_t off, bool cache, std::string* pname, + off_t* nested_off) +{ + const unsigned char* p = this->get_view(off, sizeof(Archive_header), true, + cache); + const Archive_header* hdr = reinterpret_cast<const Archive_header*>(p); + return this->interpret_header(hdr, off, pname, nested_off); +} + +// Interpret the header of HDR, the header of the archive member at +// file offset OFF. Return the size of the member, or -1 if something +// has gone wrong. Set *PNAME to the name of the member. + +off_t +Archive::interpret_header(const Archive_header* hdr, off_t off, + std::string* pname, off_t* nested_off) const +{ + if (memcmp(hdr->ar_fmag, arfmag, sizeof arfmag) != 0) + { + gold_error(_("%s: malformed archive header at %zu"), + this->name().c_str(), static_cast<size_t>(off)); + return -1; + } + + const int size_string_size = sizeof hdr->ar_size; + char size_string[size_string_size + 1]; + memcpy(size_string, hdr->ar_size, size_string_size); + char* ps = size_string + size_string_size; + while (ps[-1] == ' ') + --ps; + *ps = '\0'; + + errno = 0; + char* end; + off_t member_size = strtol(size_string, &end, 10); + if (*end != '\0' + || member_size < 0 + || (member_size == LONG_MAX && errno == ERANGE)) + { + gold_error(_("%s: malformed archive header size at %zu"), + this->name().c_str(), static_cast<size_t>(off)); + return -1; + } + + if (hdr->ar_name[0] != '/') + { + const char* name_end = strchr(hdr->ar_name, '/'); + if (name_end == NULL + || name_end - hdr->ar_name >= static_cast<int>(sizeof hdr->ar_name)) + { + gold_error(_("%s: malformed archive header name at %zu"), + this->name().c_str(), static_cast<size_t>(off)); + return -1; + } + pname->assign(hdr->ar_name, name_end - hdr->ar_name); + if (nested_off != NULL) + *nested_off = 0; + } + else if (hdr->ar_name[1] == ' ') + { + // This is the symbol table. + if (!pname->empty()) + pname->clear(); + } + else if (hdr->ar_name[1] == '/') + { + // This is the extended name table. + pname->assign(1, '/'); + } + else + { + errno = 0; + long x = strtol(hdr->ar_name + 1, &end, 10); + long y = 0; + if (*end == ':') + y = strtol(end + 1, &end, 10); + if (*end != ' ' + || x < 0 + || (x == LONG_MAX && errno == ERANGE) + || static_cast<size_t>(x) >= this->extended_names_.size()) + { + gold_error(_("%s: bad extended name index at %zu"), + this->name().c_str(), static_cast<size_t>(off)); + return -1; + } + + const char* name = this->extended_names_.data() + x; + const char* name_end = strchr(name, '\n'); + if (static_cast<size_t>(name_end - name) > this->extended_names_.size() + || name_end[-1] != '/') + { + gold_error(_("%s: bad extended name entry at header %zu"), + this->name().c_str(), static_cast<size_t>(off)); + return -1; + } + pname->assign(name, name_end - 1 - name); + if (nested_off != NULL) + *nested_off = y; + } + + return member_size; +} + +// An archive member iterator. + +class Archive::const_iterator +{ + public: + // The header of an archive member. This is what this iterator + // points to. + struct Header + { + // The name of the member. + std::string name; + // The file offset of the member. + off_t off; + // The file offset of a nested archive member. + off_t nested_off; + // The size of the member. + off_t size; + }; + + const_iterator(Archive* archive, off_t off) + : archive_(archive), off_(off) + { this->read_next_header(); } + + const Header& + operator*() const + { return this->header_; } + + const Header* + operator->() const + { return &this->header_; } + + const_iterator& + operator++() + { + if (this->off_ == this->archive_->file().filesize()) + return *this; + this->off_ += sizeof(Archive_header); + if (!this->archive_->is_thin_archive()) + this->off_ += this->header_.size; + if ((this->off_ & 1) != 0) + ++this->off_; + this->read_next_header(); + return *this; + } + + const_iterator + operator++(int) + { + const_iterator ret = *this; + ++*this; + return ret; + } + + bool + operator==(const const_iterator p) const + { return this->off_ == p->off; } + + bool + operator!=(const const_iterator p) const + { return this->off_ != p->off; } + + private: + void + read_next_header(); + + // The underlying archive. + Archive* archive_; + // The current offset in the file. + off_t off_; + // The current archive header. + Header header_; +}; + +// Read the next archive header. + +void +Archive::const_iterator::read_next_header() +{ + off_t filesize = this->archive_->file().filesize(); + while (true) + { + if (filesize - this->off_ < static_cast<off_t>(sizeof(Archive_header))) + { + if (filesize != this->off_) + { + gold_error(_("%s: short archive header at %zu"), + this->archive_->filename().c_str(), + static_cast<size_t>(this->off_)); + this->off_ = filesize; + } + this->header_.off = filesize; + return; + } + + unsigned char buf[sizeof(Archive_header)]; + this->archive_->file().read(this->off_, sizeof(Archive_header), buf); + + const Archive_header* hdr = reinterpret_cast<const Archive_header*>(buf); + off_t size = this->archive_->interpret_header(hdr, this->off_, + &this->header_.name, + &this->header_.nested_off); + if (size == -1) + { + this->header_.off = filesize; + return; + } + + this->header_.size = size; + this->header_.off = this->off_; + + // Skip special members. + if (!this->header_.name.empty() && this->header_.name != "/") + return; + + this->off_ += sizeof(Archive_header) + this->header_.size; + if ((this->off_ & 1) != 0) + ++this->off_; + } +} + +// Initial iterator. + +Archive::const_iterator +Archive::begin() +{ + return Archive::const_iterator(this, sarmag); +} + +// Final iterator. + +Archive::const_iterator +Archive::end() +{ + return Archive::const_iterator(this, this->input_file_->file().filesize()); +} + +// Get the file and offset for an archive member, which may be an +// external member of a thin archive. Set *INPUT_FILE to the +// file containing the actual member, *MEMOFF to the offset +// within that file (0 if not a nested archive), and *MEMBER_NAME +// to the name of the archive member. Return TRUE on success. + +bool +Archive::get_file_and_offset(off_t off, Input_file** input_file, off_t* memoff, + off_t* memsize, std::string* member_name) +{ + off_t nested_off; + + *memsize = this->read_header(off, false, member_name, &nested_off); + if (*memsize == -1) + return false; + + *input_file = this->input_file_; + *memoff = off + static_cast<off_t>(sizeof(Archive_header)); + + if (!this->is_thin_archive_) + return true; + + // Adjust a relative pathname so that it is relative + // to the directory containing the archive. + if (!IS_ABSOLUTE_PATH(member_name->c_str())) + { + const char* arch_path = this->filename().c_str(); + const char* basename = lbasename(arch_path); + if (basename > arch_path) + member_name->replace(0, 0, + this->filename().substr(0, basename - arch_path)); + } + + if (nested_off > 0) + { + // This is a member of a nested archive. Open the containing + // archive if we don't already have it open, then do a recursive + // call to include the member from that archive. + Archive* arch; + Nested_archive_table::const_iterator p = + this->nested_archives_.find(*member_name); + if (p != this->nested_archives_.end()) + arch = p->second; + else + { + Input_file_argument* input_file_arg = + new Input_file_argument(member_name->c_str(), + Input_file_argument::INPUT_FILE_TYPE_FILE, + "", false, parameters->options()); + *input_file = new Input_file(input_file_arg); + int dummy = 0; + if (!(*input_file)->open(*this->dirpath_, this->task_, &dummy)) + return false; + arch = new Archive(*member_name, *input_file, false, this->dirpath_, + this->task_); + arch->setup(); + std::pair<Nested_archive_table::iterator, bool> ins = + this->nested_archives_.insert(std::make_pair(*member_name, arch)); + gold_assert(ins.second); + } + return arch->get_file_and_offset(nested_off, input_file, memoff, + memsize, member_name); + } + + // This is an external member of a thin archive. Open the + // file as a regular relocatable object file. + Input_file_argument* input_file_arg = + new Input_file_argument(member_name->c_str(), + Input_file_argument::INPUT_FILE_TYPE_FILE, + "", false, this->input_file_->options()); + *input_file = new Input_file(input_file_arg); + int dummy = 0; + if (!(*input_file)->open(*this->dirpath_, this->task_, &dummy)) + return false; + + *memoff = 0; + *memsize = (*input_file)->file().filesize(); + return true; +} + +// Return an ELF object for the member at offset OFF. If +// PUNCONFIGURED is not NULL, then if the ELF object has an +// unsupported target type, set *PUNCONFIGURED to true and return +// NULL. + +Object* +Archive::get_elf_object_for_member(off_t off, bool* punconfigured) +{ + if (punconfigured != NULL) + *punconfigured = false; + + Input_file* input_file; + off_t memoff; + off_t memsize; + std::string member_name; + if (!this->get_file_and_offset(off, &input_file, &memoff, &memsize, + &member_name)) + return NULL; + + const unsigned char* ehdr; + int read_size; + Object *obj = NULL; + bool is_elf_obj = false; + + if (is_elf_object(input_file, memoff, &ehdr, &read_size)) + { + obj = make_elf_object((std::string(this->input_file_->filename()) + + "(" + member_name + ")"), + input_file, memoff, ehdr, read_size, + punconfigured); + is_elf_obj = true; + } + + if (parameters->options().has_plugins()) + { + Object* plugin_obj + = parameters->options().plugins()->claim_file(input_file, + memoff, + memsize, + obj); + if (plugin_obj != NULL) + { + // The input file was claimed by a plugin, and its symbols + // have been provided by the plugin. + // Delete its elf object. + if (obj != NULL) + delete obj; + return plugin_obj; + } + } + + if (!is_elf_obj) + { + gold_error(_("%s: member at %zu is not an ELF object"), + this->name().c_str(), static_cast<size_t>(off)); + return NULL; + } + + if (obj == NULL) + return NULL; + obj->set_no_export(this->no_export()); + return obj; +} + +// Read the symbols from all the archive members in the link. + +void +Archive::read_all_symbols() +{ + for (Archive::const_iterator p = this->begin(); + p != this->end(); + ++p) + this->read_symbols(p->off); +} + +// Read the symbols from an archive member in the link. OFF is the file +// offset of the member header. + +void +Archive::read_symbols(off_t off) +{ + Object* obj = this->get_elf_object_for_member(off, NULL); + if (obj == NULL) + return; + + Read_symbols_data* sd = new Read_symbols_data; + obj->read_symbols(sd); + Archive_member member(obj, sd); + this->members_[off] = member; +} + +// Select members from the archive and add them to the link. We walk +// through the elements in the archive map, and look each one up in +// the symbol table. If it exists as a strong undefined symbol, we +// pull in the corresponding element. We have to do this in a loop, +// since pulling in one element may create new undefined symbols which +// may be satisfied by other objects in the archive. Return true in +// the normal case, false if the first member we tried to add from +// this archive had an incompatible target. + +bool +Archive::add_symbols(Symbol_table* symtab, Layout* layout, + Input_objects* input_objects, Mapfile* mapfile) +{ + ++Archive::total_archives; + + if (this->input_file_->options().whole_archive()) + return this->include_all_members(symtab, layout, input_objects, + mapfile); + + Archive::total_members += this->num_members_; + + input_objects->archive_start(this); + + const size_t armap_size = this->armap_.size(); + + // This is a quick optimization, since we usually see many symbols + // in a row with the same offset. last_seen_offset holds the last + // offset we saw that was present in the seen_offsets_ set. + off_t last_seen_offset = -1; + + // Track which symbols in the symbol table we've already found to be + // defined. + + char* tmpbuf = NULL; + size_t tmpbuflen = 0; + bool added_new_object; + do + { + added_new_object = false; + for (size_t i = 0; i < armap_size; ++i) + { + if (this->armap_checked_[i]) + continue; + if (this->armap_[i].file_offset == last_seen_offset) + { + this->armap_checked_[i] = true; + continue; + } + if (this->seen_offsets_.find(this->armap_[i].file_offset) + != this->seen_offsets_.end()) + { + this->armap_checked_[i] = true; + last_seen_offset = this->armap_[i].file_offset; + continue; + } + + const char* sym_name = (this->armap_names_.data() + + this->armap_[i].name_offset); + + Symbol* sym; + std::string why; + Archive::Should_include t = + Archive::should_include_member(symtab, layout, sym_name, &sym, + &why, &tmpbuf, &tmpbuflen); + + if (t == Archive::SHOULD_INCLUDE_NO + || t == Archive::SHOULD_INCLUDE_YES) + this->armap_checked_[i] = true; + + if (t != Archive::SHOULD_INCLUDE_YES) + continue; + + // We want to include this object in the link. + last_seen_offset = this->armap_[i].file_offset; + this->seen_offsets_.insert(last_seen_offset); + + if (!this->include_member(symtab, layout, input_objects, + last_seen_offset, mapfile, sym, + why.c_str())) + { + if (tmpbuf != NULL) + free(tmpbuf); + return false; + } + + added_new_object = true; + } + } + while (added_new_object); + + if (tmpbuf != NULL) + free(tmpbuf); + + input_objects->archive_stop(this); + + return true; +} + +// Return whether the archive includes a member which defines the +// symbol SYM. + +bool +Archive::defines_symbol(Symbol* sym) const +{ + const char* symname = sym->name(); + size_t symname_len = strlen(symname); + size_t armap_size = this->armap_.size(); + for (size_t i = 0; i < armap_size; ++i) + { + if (this->armap_checked_[i]) + continue; + const char* archive_symname = (this->armap_names_.data() + + this->armap_[i].name_offset); + if (strncmp(archive_symname, symname, symname_len) != 0) + continue; + char c = archive_symname[symname_len]; + if (c == '\0' && sym->version() == NULL) + return true; + if (c == '@') + { + const char* ver = archive_symname + symname_len + 1; + if (*ver == '@') + { + if (sym->version() == NULL) + return true; + ++ver; + } + if (sym->version() != NULL && strcmp(sym->version(), ver) == 0) + return true; + } + } + return false; +} + +// Include all the archive members in the link. This is for --whole-archive. + +bool +Archive::include_all_members(Symbol_table* symtab, Layout* layout, + Input_objects* input_objects, Mapfile* mapfile) +{ + // Don't include the same archive twice. This can happen if + // --whole-archive is nested inside --start-group (PR gold/12163). + if (this->included_all_members_) + return true; + + this->included_all_members_ = true; + + input_objects->archive_start(this); + + if (this->members_.size() > 0) + { + std::map<off_t, Archive_member>::const_iterator p; + for (p = this->members_.begin(); + p != this->members_.end(); + ++p) + { + if (!this->include_member(symtab, layout, input_objects, p->first, + mapfile, NULL, "--whole-archive")) + return false; + ++Archive::total_members; + } + } + else + { + for (Archive::const_iterator p = this->begin(); + p != this->end(); + ++p) + { + if (!this->include_member(symtab, layout, input_objects, p->off, + mapfile, NULL, "--whole-archive")) + return false; + ++Archive::total_members; + } + } + + input_objects->archive_stop(this); + + return true; +} + +// Return the number of members in the archive. This is only used for +// reports. + +size_t +Archive::count_members() +{ + size_t ret = 0; + for (Archive::const_iterator p = this->begin(); + p != this->end(); + ++p) + ++ret; + return ret; +} + +// Include an archive member in the link. OFF is the file offset of +// the member header. WHY is the reason we are including this member. +// Return true if we added the member or if we had an error, return +// false if this was the first member we tried to add from this +// archive and it had an incompatible format. + +bool +Archive::include_member(Symbol_table* symtab, Layout* layout, + Input_objects* input_objects, off_t off, + Mapfile* mapfile, Symbol* sym, const char* why) +{ + ++Archive::total_members_loaded; + + std::map<off_t, Archive_member>::const_iterator p = this->members_.find(off); + if (p != this->members_.end()) + { + Object* obj = p->second.obj_; + + Read_symbols_data* sd = p->second.sd_; + if (mapfile != NULL) + mapfile->report_include_archive_member(obj->name(), sym, why); + if (input_objects->add_object(obj)) + { + obj->layout(symtab, layout, sd); + obj->add_symbols(symtab, sd, layout); + this->included_member_ = true; + } + delete sd; + return true; + } + + // If this is the first object we are including from this archive, + // and we searched for this archive, most likely because it was + // found via a -l option, then if the target is incompatible we want + // to move on to the next archive found in the search path. + bool unconfigured = false; + bool* punconfigured = NULL; + if (!this->included_member_ && this->searched_for()) + punconfigured = &unconfigured; + + Object* obj = this->get_elf_object_for_member(off, punconfigured); + if (obj == NULL) + { + // Return false to search for another archive, true if we found + // an error. + return unconfigured ? false : true; + } + + if (mapfile != NULL) + mapfile->report_include_archive_member(obj->name(), sym, why); + + Pluginobj* pluginobj = obj->pluginobj(); + if (pluginobj != NULL) + { + pluginobj->add_symbols(symtab, NULL, layout); + this->included_member_ = true; + return true; + } + + if (!input_objects->add_object(obj)) + { + // If this is an external member of a thin archive, unlock the + // file. + if (obj->offset() == 0) + obj->unlock(this->task_); + delete obj; + } + else + { + { + if (layout->incremental_inputs() != NULL) + layout->incremental_inputs()->report_object(obj, 0, this, NULL); + Read_symbols_data sd; + obj->read_symbols(&sd); + obj->layout(symtab, layout, &sd); + obj->add_symbols(symtab, &sd, layout); + } + + // If this is an external member of a thin archive, unlock the file + // for the next task. + if (obj->offset() == 0) + obj->unlock(this->task_); + + this->included_member_ = true; + } + + return true; +} + +// Iterate over all unused symbols, and call the visitor class V for each. + +void +Archive::do_for_all_unused_symbols(Symbol_visitor_base* v) const +{ + for (std::vector<Armap_entry>::const_iterator p = this->armap_.begin(); + p != this->armap_.end(); + ++p) + { + if (this->seen_offsets_.find(p->file_offset) + == this->seen_offsets_.end()) + v->visit(this->armap_names_.data() + p->name_offset); + } +} + +// Print statistical information to stderr. This is used for --stats. + +void +Archive::print_stats() +{ + fprintf(stderr, _("%s: archive libraries: %u\n"), + program_name, Archive::total_archives); + fprintf(stderr, _("%s: total archive members: %u\n"), + program_name, Archive::total_members); + fprintf(stderr, _("%s: loaded archive members: %u\n"), + program_name, Archive::total_members_loaded); +} + +// Add_archive_symbols methods. + +Add_archive_symbols::~Add_archive_symbols() +{ + if (this->this_blocker_ != NULL) + delete this->this_blocker_; + // next_blocker_ is deleted by the task associated with the next + // input file. +} + +// Return whether we can add the archive symbols. We are blocked by +// this_blocker_. We block next_blocker_. We also lock the file. + +Task_token* +Add_archive_symbols::is_runnable() +{ + if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked()) + return this->this_blocker_; + return NULL; +} + +void +Add_archive_symbols::locks(Task_locker* tl) +{ + tl->add(this, this->next_blocker_); + tl->add(this, this->archive_->token()); +} + +void +Add_archive_symbols::run(Workqueue* workqueue) +{ + // For an incremental link, begin recording layout information. + Incremental_inputs* incremental_inputs = this->layout_->incremental_inputs(); + if (incremental_inputs != NULL) + { + unsigned int arg_serial = this->input_argument_->file().arg_serial(); + Script_info* script_info = this->input_argument_->script_info(); + incremental_inputs->report_archive_begin(this->archive_, arg_serial, + script_info); + } + + bool added = this->archive_->add_symbols(this->symtab_, this->layout_, + this->input_objects_, + this->mapfile_); + this->archive_->unlock_nested_archives(); + + this->archive_->release(); + this->archive_->clear_uncached_views(); + + if (!added) + { + // This archive holds object files which are incompatible with + // our output file. + Read_symbols::incompatible_warning(this->input_argument_, + this->archive_->input_file()); + Read_symbols::requeue(workqueue, this->input_objects_, this->symtab_, + this->layout_, this->dirpath_, this->dirindex_, + this->mapfile_, this->input_argument_, + this->input_group_, this->next_blocker_); + delete this->archive_; + return; + } + + if (this->input_group_ != NULL) + this->input_group_->add_archive(this->archive_); + else + { + // For an incremental link, finish recording the layout information. + if (incremental_inputs != NULL) + incremental_inputs->report_archive_end(this->archive_); + + if (!parameters->options().has_plugins() + || this->archive_->input_file()->options().whole_archive()) + { + // We no longer need to know about this archive. + delete this->archive_; + } + else + { + // The plugin interface may want to rescan this archive. + parameters->options().plugins()->save_archive(this->archive_); + } + + this->archive_ = NULL; + } +} + +// Class Lib_group static variables. +unsigned int Lib_group::total_lib_groups; +unsigned int Lib_group::total_members; +unsigned int Lib_group::total_members_loaded; + +Lib_group::Lib_group(const Input_file_lib* lib, Task* task) + : Library_base(task), members_() +{ + this->members_.resize(lib->size()); +} + +const std::string& +Lib_group::do_filename() const +{ + std::string *filename = new std::string("/group/"); + return *filename; +} + +// Select members from the lib group and add them to the link. We walk +// through the members, and check if each one up should be included. +// If the object says it should be included, we do so. We have to do +// this in a loop, since including one member may create new undefined +// symbols which may be satisfied by other members. + +void +Lib_group::add_symbols(Symbol_table* symtab, Layout* layout, + Input_objects* input_objects) +{ + ++Lib_group::total_lib_groups; + + Lib_group::total_members += this->members_.size(); + + bool added_new_object; + do + { + added_new_object = false; + unsigned int i = 0; + while (i < this->members_.size()) + { + const Archive_member& member = this->members_[i]; + Object* obj = member.obj_; + std::string why; + + // Skip files with no symbols. Plugin objects have + // member.sd_ == NULL. + if (obj != NULL + && (member.sd_ == NULL || member.sd_->symbol_names != NULL)) + { + Archive::Should_include t = obj->should_include_member(symtab, + layout, + member.sd_, + &why); + + if (t != Archive::SHOULD_INCLUDE_YES) + { + ++i; + continue; + } + + this->include_member(symtab, layout, input_objects, member); + + added_new_object = true; + } + else + { + if (member.sd_ != NULL) + { + // The file must be locked in order to destroy the views + // associated with it. + gold_assert(obj != NULL); + obj->lock(this->task_); + delete member.sd_; + obj->unlock(this->task_); + } + } + + this->members_[i] = this->members_.back(); + this->members_.pop_back(); + } + } + while (added_new_object); +} + +// Include a lib group member in the link. + +void +Lib_group::include_member(Symbol_table* symtab, Layout* layout, + Input_objects* input_objects, + const Archive_member& member) +{ + ++Lib_group::total_members_loaded; + + Object* obj = member.obj_; + gold_assert(obj != NULL); + + Pluginobj* pluginobj = obj->pluginobj(); + if (pluginobj != NULL) + { + pluginobj->add_symbols(symtab, NULL, layout); + return; + } + + Read_symbols_data* sd = member.sd_; + gold_assert(sd != NULL); + obj->lock(this->task_); + if (input_objects->add_object(obj)) + { + if (layout->incremental_inputs() != NULL) + layout->incremental_inputs()->report_object(obj, member.arg_serial_, + this, NULL); + obj->layout(symtab, layout, sd); + obj->add_symbols(symtab, sd, layout); + } + delete sd; + // Unlock the file for the next task. + obj->unlock(this->task_); +} + +// Iterate over all unused symbols, and call the visitor class V for each. + +void +Lib_group::do_for_all_unused_symbols(Symbol_visitor_base* v) const +{ + // Files are removed from the members list when used, so all the + // files remaining on the list are unused. + for (std::vector<Archive_member>::const_iterator p = this->members_.begin(); + p != this->members_.end(); + ++p) + { + Object* obj = p->obj_; + obj->for_all_global_symbols(p->sd_, v); + } +} + +// Print statistical information to stderr. This is used for --stats. + +void +Lib_group::print_stats() +{ + fprintf(stderr, _("%s: lib groups: %u\n"), + program_name, Lib_group::total_lib_groups); + fprintf(stderr, _("%s: total lib groups members: %u\n"), + program_name, Lib_group::total_members); + fprintf(stderr, _("%s: loaded lib groups members: %u\n"), + program_name, Lib_group::total_members_loaded); +} + +Task_token* +Add_lib_group_symbols::is_runnable() +{ + if (this->readsyms_blocker_ != NULL && this->readsyms_blocker_->is_blocked()) + return this->readsyms_blocker_; + if (this->this_blocker_ != NULL && this->this_blocker_->is_blocked()) + return this->this_blocker_; + return NULL; +} + +void +Add_lib_group_symbols::locks(Task_locker* tl) +{ + tl->add(this, this->next_blocker_); +} + +void +Add_lib_group_symbols::run(Workqueue*) +{ + // For an incremental link, begin recording layout information. + Incremental_inputs* incremental_inputs = this->layout_->incremental_inputs(); + if (incremental_inputs != NULL) + incremental_inputs->report_archive_begin(this->lib_, 0, NULL); + + this->lib_->add_symbols(this->symtab_, this->layout_, this->input_objects_); + + if (incremental_inputs != NULL) + incremental_inputs->report_archive_end(this->lib_); +} + +Add_lib_group_symbols::~Add_lib_group_symbols() +{ + if (this->this_blocker_ != NULL) + delete this->this_blocker_; + // next_blocker_ is deleted by the task associated with the next + // input file. +} + +} // End namespace gold. |