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authorCary Coutant <ccoutant@google.com>2011-05-23 23:27:11 +0000
committerCary Coutant <ccoutant@google.com>2011-05-23 23:27:11 +0000
commit4829d394dedd7953e0ee0cf540ffccc01936499d (patch)
treeeb77be5d59cedf93ed8a5ed3e7feb32530d51a65 /gold/incremental.cc
parentdd931b2ff2bf7cecc09dba03e8916e4adc9406be (diff)
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* gold.cc (queue_middle_tasks): Process existing GOT/PLT entries.
* incremental-dump.cc (dump_incremental_inputs): Mask high-order bit when checking got_type. * incremental.cc (Sized_incremental_binary::setup_readers): Store symbol table and string table locations; initialize bit vector of file status flags. (Sized_incremental_binary::do_reserve_layout): Set bit flag for unchanged files. (Sized_incremental_binary::do_process_got_plt): New function. (Sized_incremental_binary::get_symtab_view): Use stored locations. (Output_section_incremental_inputs::set_final_data_size): Record file index for each input file. (Output_section_incremental_inputs::write_got_plt): Store file index instead of input entry offset for each GOT entry. * incremental.h (Incremental_input_entry::Incremental_input_entry): Initialize new data member. (Incremental_input_entry::set_offset): Store file index. (Incremental_input_entry::get_file_index): New function. (Incremental_input_entry::file_index_): New data member. (Incremental_binary::process_got_plt): New function. (Incremental_binary::do_process_got_plt): New function. (Sized_incremental_binary::Sized_incremental_binary): Initialize new data members. (Sized_incremental_binary::~Sized_incremental_binary): New destructor. (Sized_incremental_binary::set_file_is_unchanged): New function. (Sized_incremental_binary::file_is_unchanged): New function. (Sized_incremental_binary::do_process_got_plt): New function. (Sized_incremental_binary::file_status_): New data member. (Sized_incremental_binary::main_symtab_loc_): New data member. (Sized_incremental_binary::main_strtab_loc_): New data member. * output.cc (Output_data_got::Got_entry::write): Add case RESERVED_CODE. (Output_data_got::add_global): Call add_got_entry. (Output_data_got::add_global_plt): Likewise. (Output_data_got::add_global_with_rel): Likewise. (Output_data_got::add_global_with_rela): Likewise. (Output_data_got::add_global_pair_with_rel): Call add_got_entry_pair. (Output_data_got::add_global_pair_with_rela): Likewise. (Output_data_got::add_local): Call add_got_entry. (Output_data_got::add_local_plt): Likewise. (Output_data_got::add_local_with_rel): Likewise. (Output_data_got::add_local_with_rela): Likewise. (Output_data_got::add_local_pair_with_rel): Call add_got_entry_pair. (Output_data_got::add_local_pair_with_rela): Likewise. (Output_data_got::reserve_slot): New function. (Output_data_got::reserve_slot_for_global): New function. (Output_data_got::add_got_entry): New function. (Output_data_got::add_got_entry_pair): New function. (Output_section::add_output_section_data): Edit FIXME. * output.h (Output_section_data_build::Output_section_data_build): New constructor with size parameter. (Output_data_space::Output_data_space): Likewise. (Output_data_got::Output_data_got): Initialize new data member; new constructor with size parameter. (Output_data_got::add_constant): Call add_got_entry. (Output_data_got::reserve_slot): New function. (Output_data_got::reserve_slot_for_global): New function. (class Output_data_got::Got_entry): Add RESERVED_CODE. (Output_data_got::add_got_entry): New function. (Output_data_got::add_got_entry_pair): New function. (Output_data_got::free_list_): New data member. * target.h (Sized_target::init_got_plt_for_update): New function. (Sized_target::register_global_plt_entry): New function. * x86_64.cc (Output_data_plt_x86_64::Output_data_plt_x86_64): Initialize new data member; call init; add constructor with PLT count. (Output_data_plt_x86_64::init): New function. (Output_data_plt_x86_64::add_relocation): New function. (Output_data_plt_x86_64::reserve_slot): New function. (Output_data_plt_x86_64::free_list_): New data member. (Target_x86_64::init_got_plt_for_update): New function. (Target_x86_64::register_global_plt_entry): New function. (Output_data_plt_x86_64::add_entry): Allocate from free list for incremental updates. (Output_data_plt_x86_64::add_relocation): New function. * testsuite/object_unittest.cc (Object_test): Set default options.
Diffstat (limited to 'gold/incremental.cc')
-rw-r--r--gold/incremental.cc122
1 files changed, 106 insertions, 16 deletions
diff --git a/gold/incremental.cc b/gold/incremental.cc
index 1250d70..b831b97 100644
--- a/gold/incremental.cc
+++ b/gold/incremental.cc
@@ -258,6 +258,19 @@ Sized_incremental_binary<size, big_endian>::setup_readers()
this->got_plt_reader_ =
Incremental_got_plt_reader<big_endian>(got_plt_view.data());
+ // Find the main symbol table.
+ unsigned int main_symtab_shndx =
+ this->elf_file_.find_section_by_type(elfcpp::SHT_SYMTAB);
+ gold_assert(main_symtab_shndx != elfcpp::SHN_UNDEF);
+ this->main_symtab_loc_ = this->elf_file_.section_contents(main_symtab_shndx);
+
+ // Find the main symbol string table.
+ unsigned int main_strtab_shndx =
+ this->elf_file_.section_link(main_symtab_shndx);
+ gold_assert(main_strtab_shndx != elfcpp::SHN_UNDEF
+ && main_strtab_shndx < this->elf_file_.shnum());
+ this->main_strtab_loc_ = this->elf_file_.section_contents(main_strtab_shndx);
+
// Walk the list of input files (a) to setup an Input_reader for each
// input file, and (b) to record maps of files added from archive
// libraries and scripts.
@@ -314,6 +327,10 @@ Sized_incremental_binary<size, big_endian>::setup_readers()
unsigned int nglobals = this->symtab_reader_.symbol_count();
this->symbol_map_.resize(nglobals);
+ // Initialize the status of each input file.
+ this->file_status_ = new unsigned char[(count + 7) / 8];
+ memset(this->file_status_, 0, (count + 7) / 8);
+
this->has_incremental_info_ = true;
}
@@ -507,6 +524,8 @@ Sized_incremental_binary<size, big_endian>::do_reserve_layout(
Input_entry_reader input_file =
this->inputs_reader_.input_file(input_file_index);
+ this->set_file_is_unchanged(input_file_index);
+
if (input_file.type() == INCREMENTAL_INPUT_SHARED_LIBRARY)
return;
@@ -523,6 +542,83 @@ Sized_incremental_binary<size, big_endian>::do_reserve_layout(
}
}
+// Process the GOT and PLT entries from the existing output file.
+
+template<int size, bool big_endian>
+void
+Sized_incremental_binary<size, big_endian>::do_process_got_plt(
+ Symbol_table* symtab,
+ Layout* layout)
+{
+ Incremental_got_plt_reader<big_endian> got_plt_reader(this->got_plt_reader());
+ Sized_target<size, big_endian>* target =
+ parameters->sized_target<size, big_endian>();
+
+ // Get the number of symbols in the main symbol table and in the
+ // incremental symbol table. The difference between the two counts
+ // is the index of the first forced-local or global symbol in the
+ // main symbol table.
+ unsigned int symtab_count =
+ this->main_symtab_loc_.data_size / elfcpp::Elf_sizes<size>::sym_size;
+ unsigned int isym_count = this->symtab_reader_.symbol_count();
+ unsigned int first_global = symtab_count - isym_count;
+
+ // Tell the target how big the GOT and PLT sections are.
+ unsigned int got_count = got_plt_reader.get_got_entry_count();
+ unsigned int plt_count = got_plt_reader.get_plt_entry_count();
+ Output_data_got<size, big_endian>* got =
+ target->init_got_plt_for_update(symtab, layout, got_count, plt_count);
+
+ // Read the GOT entries from the base file and build the outgoing GOT.
+ for (unsigned int i = 0; i < got_count; ++i)
+ {
+ unsigned int got_type = got_plt_reader.get_got_type(i);
+ if ((got_type & 0x7f) == 0x7f)
+ {
+ // This is the second entry of a pair.
+ got->reserve_slot(i);
+ continue;
+ }
+ unsigned int got_desc = got_plt_reader.get_got_desc(i);
+ if (got_type & 0x80)
+ {
+ // This is an entry for a local symbol. GOT_DESC is the index
+ // of the object file entry in the list of input files. Ignore
+ // this entry if the object file was replaced.
+ gold_debug(DEBUG_INCREMENTAL,
+ "GOT entry %d, type %02x: (local symbol)",
+ i, got_type & 0x7f);
+ if (this->file_is_unchanged(got_desc))
+ got->reserve_slot(i);
+ }
+ else
+ {
+ // This is an entry for a global symbol. GOT_DESC is the symbol
+ // table index.
+ // FIXME: This should really be a fatal error (corrupt input).
+ gold_assert(got_desc >= first_global && got_desc < symtab_count);
+ Symbol* sym = this->global_symbol(got_desc - first_global);
+ gold_debug(DEBUG_INCREMENTAL,
+ "GOT entry %d, type %02x: %s",
+ i, got_type, sym->name());
+ got->reserve_slot_for_global(i, sym, got_type);
+ }
+ }
+
+ // Read the PLT entries from the base file and pass each to the target.
+ for (unsigned int i = 0; i < plt_count; ++i)
+ {
+ unsigned int plt_desc = got_plt_reader.get_plt_desc(i);
+ // FIXME: This should really be a fatal error (corrupt input).
+ gold_assert(plt_desc >= first_global && plt_desc < symtab_count);
+ Symbol* sym = this->global_symbol(plt_desc - first_global);
+ gold_debug(DEBUG_INCREMENTAL,
+ "PLT entry %d: %s",
+ i, sym->name());
+ target->register_global_plt_entry(i, sym);
+ }
+}
+
// Apply incremental relocations for symbols whose values have changed.
template<int size, bool big_endian>
@@ -628,20 +724,12 @@ Sized_incremental_binary<size, big_endian>::get_symtab_view(
unsigned int* nsyms,
elfcpp::Elf_strtab* strtab)
{
- unsigned int symtab_shndx =
- this->elf_file_.find_section_by_type(elfcpp::SHT_SYMTAB);
- gold_assert(symtab_shndx != elfcpp::SHN_UNDEF);
- Location symtab_location(this->elf_file_.section_contents(symtab_shndx));
- *symtab_view = this->view(symtab_location);
- *nsyms = symtab_location.data_size / elfcpp::Elf_sizes<size>::sym_size;
+ *symtab_view = this->view(this->main_symtab_loc_);
+ *nsyms = this->main_symtab_loc_.data_size / elfcpp::Elf_sizes<size>::sym_size;
- unsigned int strtab_shndx = this->elf_file_.section_link(symtab_shndx);
- gold_assert(strtab_shndx != elfcpp::SHN_UNDEF
- && strtab_shndx < this->elf_file_.shnum());
-
- Location strtab_location(this->elf_file_.section_contents(strtab_shndx));
- View strtab_view(this->view(strtab_location));
- *strtab = elfcpp::Elf_strtab(strtab_view.data(), strtab_location.data_size);
+ View strtab_view(this->view(this->main_strtab_loc_));
+ *strtab = elfcpp::Elf_strtab(strtab_view.data(),
+ this->main_strtab_loc_.data_size);
}
namespace
@@ -1022,6 +1110,7 @@ Output_section_incremental_inputs<size, big_endian>::set_final_data_size()
unsigned int input_offset = this->header_size;
// Offset of each supplemental info block.
+ unsigned int file_index = 0;
unsigned int info_offset = this->header_size;
info_offset += this->input_entry_size * inputs->input_file_count();
@@ -1031,8 +1120,9 @@ Output_section_incremental_inputs<size, big_endian>::set_final_data_size()
p != inputs->input_files().end();
++p)
{
- // Set the offset of the input file entry.
- (*p)->set_offset(input_offset);
+ // Set the index and offset of the input file entry.
+ (*p)->set_offset(file_index, input_offset);
+ ++file_index;
input_offset += this->input_entry_size;
// Set the offset of the supplemental info block.
@@ -1655,7 +1745,7 @@ Output_section_incremental_inputs<size, big_endian>::write_got_plt(
gold_assert(entry != NULL);
const Object* obj = entry->object();
gold_assert(obj != NULL);
- view_info.got_descriptor = (*p)->get_offset();
+ view_info.got_descriptor = (*p)->get_file_index();
Got_visitor v(view_info);
obj->for_all_local_got_entries(&v);
}