// archive.cc -- archive support for gold
-// Copyright 2006, 2007, 2008 Free Software Foundation, Inc.
+// Copyright (C) 2006-2020 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
#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)
+ {
+ 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.
+ if (layout->script_options()->is_pending_assignment(sym_name))
+ return Library_base::SHOULD_INCLUDE_NO;
+
+ // If the symbol is weak undefined, we still need to check
+ // for other reasons (like a -u option).
+ if (sym->binding() != elfcpp::STB_WEAK)
+ return Library_base::SHOULD_INCLUDE_YES;
+ }
+
+ // Check whether the symbol was named in a -u option.
+ if (parameters->options().is_undefined(sym_name))
+ {
+ *why = "-u ";
+ *why += sym_name;
+ return Library_base::SHOULD_INCLUDE_YES;
+ }
+
+ if (parameters->options().is_export_dynamic_symbol(sym_name))
+ {
+ *why = "--export-dynamic-symbol ";
+ *why += sym_name;
+ return Library_base::SHOULD_INCLUDE_YES;
+ }
+
+ 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;
+ return Library_base::SHOULD_INCLUDE_YES;
+ }
+
+ if (!parameters->options().relocatable())
+ {
+ const char* entry_sym = parameters->entry();
+ if (entry_sym != NULL && strcmp(sym_name, entry_sym) == 0)
+ {
+ *why = "entry symbol ";
+ *why += sym_name;
+ return Library_base::SHOULD_INCLUDE_YES;
+ }
+ }
+
+ return Library_base::SHOULD_INCLUDE_UNKNOWN;
+}
+
// The header of an entry in the archive. This is all readable text,
-// padded with spaces where necesary. If the contents of an archive
+// padded with spaces where necessary. If the contents of an archive
// are all text file, the entire archive is readable.
struct Archive::Archive_header
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] =
const char Archive::arfmag[2] = { '`', '\n' };
+const char Archive::sym64name[7] = { '/', 'S', 'Y', 'M', '6', '4', '/' };
+
+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.
// The first member of the archive should be the symbol table.
std::string armap_name;
- section_size_type armap_size =
- convert_to_section_size_type(this->read_header(sarmag, false,
- &armap_name, NULL));
+ 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);
+ this->read_armap<32>(sarmag + sizeof(Archive_header), armap_size);
+ off = sarmag + sizeof(Archive_header) + armap_size;
+ }
+ else if (armap_name == "/SYM64/")
+ {
+ this->read_armap<64>(sarmag + sizeof(Archive_header), armap_size);
off = sarmag + sizeof(Archive_header) + armap_size;
}
else if (!this->input_file_->options().whole_archive())
if ((off & 1) != 0)
++off;
std::string xname;
- section_size_type extended_size =
- convert_to_section_size_type(this->read_header(off, true, &xname, NULL));
+ 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),
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.
// Read the archive symbol map.
+template<int mapsize>
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);
+ typedef typename elfcpp::Elf_types<mapsize>::Elf_Addr Entry_type;
+ const Entry_type* pword = reinterpret_cast<const Entry_type*>(p);
+ unsigned long nsyms = convert_types<unsigned long, Entry_type>(
+ elfcpp::Swap<mapsize, true>::readval(pword));
++pword;
// Note that the addition is in units of sizeof(elfcpp::Elf_Word).
this->armap_.resize(nsyms);
section_offset_type name_offset = 0;
- for (unsigned int i = 0; i < nsyms; ++i)
+ for (unsigned long i = 0; i < nsyms; ++i)
{
this->armap_[i].name_offset = name_offset;
- this->armap_[i].file_offset = elfcpp::Swap<32, true>::readval(pword);
+ this->armap_[i].file_offset = convert_types<off_t, Entry_type>(
+ elfcpp::Swap<mapsize, 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)
}
// Interpret the header of HDR, the header of the archive member at
-// file offset OFF. Fail if something goes wrong. Return the size of
-// the member. Set *PNAME to the name of the member.
+// 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)
+ 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 this->input_file_->file().filesize() - off;
+ return -1;
}
const int size_string_size = sizeof hdr->ar_size;
{
gold_error(_("%s: malformed archive header size at %zu"),
this->name().c_str(), static_cast<size_t>(off));
- return this->input_file_->file().filesize() - off;
+ return -1;
}
if (hdr->ar_name[0] != '/')
{
gold_error(_("%s: malformed archive header name at %zu"),
this->name().c_str(), static_cast<size_t>(off));
- return this->input_file_->file().filesize() - off;
+ return -1;
}
pname->assign(hdr->ar_name, name_end - hdr->ar_name);
if (nested_off != NULL)
else if (hdr->ar_name[1] == ' ')
{
// This is the symbol table.
- pname->clear();
+ if (!pname->empty())
+ pname->clear();
+ }
+ else if (memcmp(hdr->ar_name, sym64name, sizeof sym64name) == 0)
+ {
+ // This is the symbol table, 64-bit version.
+ pname->assign(sym64name, sizeof sym64name);
}
else if (hdr->ar_name[1] == '/')
{
{
gold_error(_("%s: bad extended name index at %zu"),
this->name().c_str(), static_cast<size_t>(off));
- return this->input_file_->file().filesize() - off;
+ return -1;
}
const char* name = this->extended_names_.data() + x;
{
gold_error(_("%s: bad extended name entry at header %zu"),
this->name().c_str(), static_cast<size_t>(off));
- return this->input_file_->file().filesize() - off;
+ return -1;
}
pname->assign(name, name_end - 1 - name);
if (nested_off != NULL)
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 != "/"
+ && this->header_.name != "/SYM64/")
+ 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;
+ bool unclaimed = 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;
+ }
+
+ unclaimed = true;
+ }
+
+ if (!is_elf_obj)
+ {
+ if (unclaimed)
+ gold_error(_("%s: plugin failed to claim member %s at %zu"),
+ this->name().c_str(), member_name.c_str(),
+ static_cast<size_t>(off));
+ else
+ gold_error(_("%s: member %s at %zu is not an ELF object"),
+ this->name().c_str(), member_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.
+// 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.
-void
+bool
Archive::add_symbols(Symbol_table* symtab, Layout* layout,
- Input_objects* input_objects)
+ 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);
+ 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();
// 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
{
const char* sym_name = (this->armap_names_.data()
+ this->armap_[i].name_offset);
- Symbol* sym = symtab->lookup(sym_name);
- if (sym == NULL)
- {
- // Check whether the symbol was named in a -u option.
- if (!parameters->options().is_undefined(sym_name))
- continue;
- }
- else if (!sym->is_undefined())
- {
- this->armap_checked_[i] = true;
- continue;
- }
- else if (sym->binding() == elfcpp::STB_WEAK)
+
+ 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);
- this->armap_checked_[i] = true;
- this->include_member(symtab, layout, input_objects,
- 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.
-void
+bool
Archive::include_all_members(Symbol_table* symtab, Layout* layout,
- Input_objects* input_objects)
+ Input_objects* input_objects, Mapfile* mapfile)
{
- off_t off = sarmag;
- off_t filesize = this->input_file_->file().filesize();
- while (true)
- {
- if (filesize - off < static_cast<off_t>(sizeof(Archive_header)))
- {
- if (filesize != off)
- gold_error(_("%s: short archive header at %zu"),
- this->name().c_str(), static_cast<size_t>(off));
- break;
- }
+ // 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;
- unsigned char hdr_buf[sizeof(Archive_header)];
- this->input_file_->file().read(off, sizeof(Archive_header), hdr_buf);
+ input_objects->archive_start(this);
- const Archive_header* hdr =
- reinterpret_cast<const Archive_header*>(hdr_buf);
- std::string name;
- off_t size = this->interpret_header(hdr, off, &name, NULL);
- if (name.empty())
+ if (this->members_.size() > 0)
+ {
+ std::map<off_t, Archive_member>::const_iterator p;
+ for (p = this->members_.begin();
+ p != this->members_.end();
+ ++p)
{
- // Symbol table.
+ if (!this->include_member(symtab, layout, input_objects, p->first,
+ mapfile, NULL, "--whole-archive"))
+ return false;
+ ++Archive::total_members;
}
- else if (name == "/")
+ }
+ else
+ {
+ for (Archive::const_iterator p = this->begin();
+ p != this->end();
+ ++p)
{
- // Extended name table.
+ if (!this->include_member(symtab, layout, input_objects, p->off,
+ mapfile, NULL, "--whole-archive"))
+ return false;
+ ++Archive::total_members;
}
- else
- this->include_member(symtab, layout, input_objects, off);
-
- off += sizeof(Archive_header);
- if (!this->is_thin_archive_)
- off += size;
- if ((off & 1) != 0)
- ++off;
}
+
+ 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;
}
+// RAII class to ensure we unlock the object if it's a member of a
+// thin archive. We can't use Task_lock_obj in Archive::include_member
+// because the object file is already locked when it's opened by
+// get_elf_object_for_member.
+
+class Thin_archive_object_unlocker
+{
+ public:
+ Thin_archive_object_unlocker(const Task *task, Object* obj)
+ : task_(task), obj_(obj)
+ { }
+
+ ~Thin_archive_object_unlocker()
+ {
+ if (this->obj_->offset() == 0)
+ this->obj_->unlock(this->task_);
+ }
+
+ private:
+ Thin_archive_object_unlocker(const Thin_archive_object_unlocker&);
+ Thin_archive_object_unlocker& operator=(const Thin_archive_object_unlocker&);
+
+ const Task* task_;
+ Object* obj_;
+};
+
// Include an archive member in the link. OFF is the file offset of
-// the member header.
+// 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.
-void
+bool
Archive::include_member(Symbol_table* symtab, Layout* layout,
- Input_objects* input_objects, off_t off)
+ Input_objects* input_objects, off_t off,
+ Mapfile* mapfile, Symbol* sym, const char* why)
{
- std::string n;
- off_t nested_off;
- this->read_header(off, false, &n, &nested_off);
-
- Input_file* input_file;
- off_t memoff;
+ ++Archive::total_members_loaded;
- if (!this->is_thin_archive_)
- {
- input_file = this->input_file_;
- memoff = off + static_cast<off_t>(sizeof(Archive_header));
- }
- else
+ std::map<off_t, Archive_member>::const_iterator p = this->members_.find(off);
+ if (p != this->members_.end())
{
- // Adjust a relative pathname so that it is relative
- // to the directory containing the archive.
- if (!IS_ABSOLUTE_PATH(n.c_str()))
- {
- const char *arch_path = this->name().c_str();
- const char *basename = lbasename(arch_path);
- if (basename > arch_path)
- n.replace(0, 0, this->name().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(n);
- if (p != this->nested_archives_.end())
- arch = p->second;
- else
- {
- Input_file_argument* input_file_arg =
- new Input_file_argument(n.c_str(), false, "", false,
- parameters->options());
- input_file = new Input_file(input_file_arg);
- if (!input_file->open(parameters->options(), *this->dirpath_,
- this->task_))
- return;
- arch = new Archive(n, input_file, false, this->dirpath_,
- this->task_);
- arch->setup();
- std::pair<Nested_archive_table::iterator, bool> ins =
- this->nested_archives_.insert(std::make_pair(n, arch));
- gold_assert(ins.second);
- }
- arch->include_member(symtab, layout, input_objects, nested_off);
- return;
- }
- // 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(n.c_str(), false, "", false,
- this->input_file_->options());
- input_file = new Input_file(input_file_arg);
- if (!input_file->open(parameters->options(), *this->dirpath_,
- this->task_))
+ 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))
{
- return;
+ obj->layout(symtab, layout, sd);
+ obj->add_symbols(symtab, sd, layout);
+ this->included_member_ = true;
}
- memoff = 0;
+ delete sd;
+ return true;
}
- off_t filesize = input_file->file().filesize();
- int read_size = elfcpp::Elf_sizes<64>::ehdr_size;
- if (filesize - memoff < read_size)
- read_size = filesize - memoff;
-
- if (read_size < 4)
+ // 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)
{
- gold_error(_("%s: member at %zu is not an ELF object"),
- this->name().c_str(), static_cast<size_t>(off));
- return;
+ // Return false to search for another archive, true if we found
+ // an error.
+ return unconfigured ? false : true;
}
- const unsigned char* ehdr = input_file->file().get_view(memoff, 0, read_size,
- true, false);
+ // If the object is an external member of a thin archive,
+ // unlock it when we're done here.
+ Thin_archive_object_unlocker unlocker(this->task_, obj);
- static unsigned char elfmagic[4] =
- {
- elfcpp::ELFMAG0, elfcpp::ELFMAG1,
- elfcpp::ELFMAG2, elfcpp::ELFMAG3
- };
- if (memcmp(ehdr, elfmagic, 4) != 0)
- {
- gold_error(_("%s: member at %zu is not an ELF object"),
- this->name().c_str(), static_cast<size_t>(off));
- return;
- }
-
- Object* obj = make_elf_object((std::string(this->input_file_->filename())
- + "(" + n + ")"),
- input_file, memoff, ehdr, read_size);
+ if (mapfile != NULL)
+ mapfile->report_include_archive_member(obj->name(), sym, why);
- if (input_objects->add_object(obj))
+ Pluginobj* pluginobj = obj->pluginobj();
+ if (pluginobj != NULL)
{
- Read_symbols_data sd;
- obj->read_symbols(&sd);
- obj->layout(symtab, layout, &sd);
- obj->add_symbols(symtab, &sd);
+ pluginobj->add_symbols(symtab, NULL, layout);
+ this->included_member_ = true;
+ return true;
}
- else
+
+ if (!input_objects->add_object(obj))
{
- // FIXME: We need to close the descriptor here.
delete obj;
+ return true;
}
- if (this->is_thin_archive_)
+ 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);
+ }
+
+ 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)
{
- // Opening the file locked it. Unlock it now.
- input_file->file().unlock(this->task_);
+ 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()
}
void
-Add_archive_symbols::run(Workqueue*)
+Add_archive_symbols::run(Workqueue* workqueue)
{
- this->archive_->add_symbols(this->symtab_, this->layout_,
- this->input_objects_);
+ // 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
{
- // We no longer need to know about this archive.
- delete this->archive_;
+ // 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.
projects / deliverable / binutils-gdb.git / blobdiff