(get_uncompressed_size): New function.
(decompress_input_section): New function.
* compressed_output.h (get_uncompressed_size): New function.
(decompress_input_section): New function.
* dwarf_reader.cc (Sized_dwarf_line_info::Sized_dwarf_line_info)
Handle compressed debug sections.
* layout.cc (is_compressed_debug_section): New function.
(Layout::output_section_name): Map compressed section names to
canonical names.
* layout.h (is_compressed_debug_section): New function.
(is_debug_info_section): Recognize compressed debug sections.
* merge.cc: Include compressed_output.h.
(Output_merge_data::do_add_input_section): Handle compressed
debug sections.
(Output_merge_string::do_add_input_section): Handle compressed
debug sections.
* object.cc: Include compressed_output.h.
(Sized_relobj::Sized_relobj): Initialize new data members.
(build_compressed_section_map): New function.
(Sized_relobj::do_read_symbols): Handle compressed debug sections.
* object.h (Object::section_is_compressed): New method.
(Object::do_section_is_compressed): New method.
(Sized_relobj::Compressed_section_map): New type.
(Sized_relobj::do_section_is_compressed): New method.
(Sized_relobj::compressed_sections_): New data member.
* output.cc (Output_section::add_input_section): Handle compressed
debug sections.
* reloc.cc: Include compressed_output.h.
(Sized_relobj::write_sections): Handle compressed debug sections.
+2010-07-12 Cary Coutant <ccoutant@google.com>
+
+ * compressed_output.cc (zlib_decompress): New function.
+ (get_uncompressed_size): New function.
+ (decompress_input_section): New function.
+ * compressed_output.h (get_uncompressed_size): New function.
+ (decompress_input_section): New function.
+ * dwarf_reader.cc (Sized_dwarf_line_info::Sized_dwarf_line_info)
+ Handle compressed debug sections.
+ * layout.cc (is_compressed_debug_section): New function.
+ (Layout::output_section_name): Map compressed section names to
+ canonical names.
+ * layout.h (is_compressed_debug_section): New function.
+ (is_debug_info_section): Recognize compressed debug sections.
+ * merge.cc: Include compressed_output.h.
+ (Output_merge_data::do_add_input_section): Handle compressed
+ debug sections.
+ (Output_merge_string::do_add_input_section): Handle compressed
+ debug sections.
+ * object.cc: Include compressed_output.h.
+ (Sized_relobj::Sized_relobj): Initialize new data members.
+ (build_compressed_section_map): New function.
+ (Sized_relobj::do_read_symbols): Handle compressed debug sections.
+ * object.h (Object::section_is_compressed): New method.
+ (Object::do_section_is_compressed): New method.
+ (Sized_relobj::Compressed_section_map): New type.
+ (Sized_relobj::do_section_is_compressed): New method.
+ (Sized_relobj::compressed_sections_): New data member.
+ * output.cc (Output_section::add_input_section): Handle compressed
+ debug sections.
+ * reloc.cc: Include compressed_output.h.
+ (Sized_relobj::write_sections): Handle compressed debug sections.
+
2010-07-08 Cary Coutant <ccoutant@google.com>
* resolve.cc (Symbol_table::resolve): Remember whether undef was
-// compressed_output.cc -- manage compressed output sections for gold
+// compressed_output.cc -- manage compressed debug sections for gold
-// Copyright 2007, 2008 Free Software Foundation, Inc.
+// Copyright 2007, 2008, 2010 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
namespace gold
{
+#ifdef HAVE_ZLIB_H
+
// Compress UNCOMPRESSED_DATA of size UNCOMPRESSED_SIZE. Returns true
// if it successfully compressed, false if it failed for any reason
// (including not having zlib support in the library). If it returns
// "ZLIB", and 8 bytes indicating the uncompressed size, in big-endian
// order.
-#ifdef HAVE_ZLIB_H
-
static bool
zlib_compress(const unsigned char* uncompressed_data,
unsigned long uncompressed_size,
}
}
+// Decompress COMPRESSED_DATA of size COMPRESSED_SIZE, into a buffer
+// UNCOMPRESSED_DATA of size UNCOMPRESSED_SIZE. Returns TRUE if it
+// decompressed successfully, false if it failed. The buffer, of
+// appropriate size, is provided by the caller, and is typically part
+// of the memory-mapped output file.
+
+static bool
+zlib_decompress(const unsigned char* compressed_data,
+ unsigned long compressed_size,
+ unsigned char* uncompressed_data,
+ unsigned long uncompressed_size)
+{
+ z_stream strm;
+ int rc;
+
+ /* It is possible the section consists of several compressed
+ buffers concatenated together, so we uncompress in a loop. */
+ strm.zalloc = NULL;
+ strm.zfree = NULL;
+ strm.opaque = NULL;
+ strm.avail_in = compressed_size;
+ strm.next_in = const_cast<Bytef*>(compressed_data);
+ strm.avail_out = uncompressed_size;
+
+ rc = inflateInit(&strm);
+ while (strm.avail_in > 0)
+ {
+ if (rc != Z_OK)
+ return false;
+ strm.next_out = ((Bytef*) uncompressed_data
+ + (uncompressed_size - strm.avail_out));
+ rc = inflate(&strm, Z_FINISH);
+ if (rc != Z_STREAM_END)
+ return false;
+ rc = inflateReset(&strm);
+ }
+ rc = inflateEnd(&strm);
+ if (rc != Z_OK || strm.avail_out != 0)
+ return false;
+
+ return true;
+}
+
#else // !defined(HAVE_ZLIB_H)
static bool
return false;
}
+static bool
+zlib_decompress(const unsigned char*, unsigned long,
+ unsigned char**, unsigned long*)
+{
+ return false;
+}
+
#endif // !defined(HAVE_ZLIB_H)
+// Read the compression header of a compressed debug section and return
+// the uncompressed size.
+
+uint64_t
+get_uncompressed_size(const unsigned char* compressed_data,
+ section_size_type compressed_size)
+{
+ const unsigned int zlib_header_size = 12;
+
+ /* Verify the compression header. Currently, we support only zlib
+ compression, so it should be "ZLIB" followed by the uncompressed
+ section size, 8 bytes in big-endian order. */
+ if (compressed_size >= zlib_header_size
+ && strncmp(reinterpret_cast<const char*>(compressed_data),
+ "ZLIB", 4) == 0)
+ return elfcpp::Swap_unaligned<64, true>::readval(compressed_data + 4);
+ return -1ULL;
+}
+
+// Decompress a compressed debug section directly into the output file.
+
+bool
+decompress_input_section(const unsigned char* compressed_data,
+ unsigned long compressed_size,
+ unsigned char* uncompressed_data,
+ unsigned long uncompressed_size)
+{
+ const unsigned int zlib_header_size = 12;
+
+ /* Verify the compression header. Currently, we support only zlib
+ compression, so it should be "ZLIB" followed by the uncompressed
+ section size, 8 bytes in big-endian order. */
+ if (compressed_size >= zlib_header_size
+ && strncmp(reinterpret_cast<const char*>(compressed_data),
+ "ZLIB", 4) == 0)
+ {
+ unsigned long uncompressed_size_check =
+ elfcpp::Swap_unaligned<64, true>::readval(compressed_data + 4);
+ gold_assert(uncompressed_size_check == uncompressed_size);
+ return zlib_decompress(compressed_data + zlib_header_size,
+ compressed_size - zlib_header_size,
+ uncompressed_data,
+ uncompressed_size);
+ }
+ return false;
+}
+
// Class Output_compressed_section.
// Set the final data size of a compressed section. This is where
// compressed_output.h -- compressed output sections for gold -*- C++ -*-
-// Copyright 2007, 2008 Free Software Foundation, Inc.
+// Copyright 2007, 2008, 2010 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
class General_options;
+// Read the compression header of a compressed debug section and return
+// the uncompressed size.
+
+extern uint64_t
+get_uncompressed_size(const unsigned char*, section_size_type);
+
+// Decompress a compressed debug section directly into the output file.
+
+extern bool
+decompress_input_section(const unsigned char*, unsigned long, unsigned char*,
+ unsigned long);
+
// This is used for a section whose data should be compressed. It is
// a regular Output_section which computes its contents into a buffer
// and then postprocesses it.
#include "reloc.h"
#include "dwarf_reader.h"
#include "int_encoding.h"
+#include "compressed_output.h"
namespace gold {
if (this->buffer_ == NULL)
return;
+ section_size_type uncompressed_size = 0;
+ unsigned char* uncompressed_data = NULL;
+ if (object->section_is_compressed(debug_shndx, &uncompressed_size))
+ {
+ uncompressed_data = new unsigned char[uncompressed_size];
+ if (!decompress_input_section(this->buffer_,
+ this->buffer_end_ - this->buffer_,
+ uncompressed_data,
+ uncompressed_size))
+ object->error(_("could not decompress section %s"),
+ object->section_name(debug_shndx).c_str());
+ this->buffer_ = uncompressed_data;
+ this->buffer_end_ = this->buffer_ + uncompressed_size;
+ }
+
// Find the relocation section for ".debug_line".
// We expect these for relobjs (.o's) but not dynobjs (.so's).
bool got_relocs = false;
static bool
is_compressible_debug_section(const char* secname)
{
- return (strncmp(secname, ".debug", sizeof(".debug") - 1) == 0);
+ return (is_prefix_of(".debug", secname));
+}
+
+// We may see compressed debug sections in input files. Return TRUE
+// if this is the name of a compressed debug section.
+
+bool
+is_compressed_debug_section(const char* secname)
+{
+ return (is_prefix_of(".zdebug", secname));
}
// Make a new Output_section, and attach it to segments as
}
}
+ // Compressed debug sections should be mapped to the corresponding
+ // uncompressed section.
+ if (is_compressed_debug_section(name))
+ {
+ size_t len = strlen(name);
+ char *uncompressed_name = new char[len];
+ uncompressed_name[0] = '.';
+ gold_assert(name[0] == '.' && name[1] == 'z');
+ strncpy(&uncompressed_name[1], &name[2], len - 2);
+ uncompressed_name[len - 1] = '\0';
+ *plen = len - 1;
+ return uncompressed_name;
+ }
+
return name;
}
class Eh_frame;
class Target;
+// Return TRUE if SECNAME is the name of a compressed debug section.
+extern bool
+is_compressed_debug_section(const char* secname);
+
// This task function handles mapping the input sections to output
// sections and laying them out in memory.
{
// Debugging sections can only be recognized by name.
return (strncmp(name, ".debug", sizeof(".debug") - 1) == 0
+ || strncmp(name, ".zdebug", sizeof(".zdebug") - 1) == 0
|| strncmp(name, ".gnu.linkonce.wi.",
sizeof(".gnu.linkonce.wi.") - 1) == 0
|| strncmp(name, ".line", sizeof(".line") - 1) == 0
// merge.cc -- handle section merging for gold
-// Copyright 2006, 2007, 2008 Free Software Foundation, Inc.
+// Copyright 2006, 2007, 2008, 2010 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
#include <algorithm>
#include "merge.h"
+#include "compressed_output.h"
namespace gold
{
Output_merge_data::do_add_input_section(Relobj* object, unsigned int shndx)
{
section_size_type len;
+ section_size_type uncompressed_size = 0;
+ unsigned char* uncompressed_data = NULL;
const unsigned char* p = object->section_contents(shndx, &len, false);
+ if (object->section_is_compressed(shndx, &uncompressed_size))
+ {
+ uncompressed_data = new unsigned char[uncompressed_size];
+ if (!decompress_input_section(p, len, uncompressed_data,
+ uncompressed_size))
+ object->error(_("could not decompress section %s"),
+ object->section_name(shndx).c_str());
+ p = uncompressed_data;
+ len = uncompressed_size;
+ }
+
section_size_type entsize = convert_to_section_size_type(this->entsize());
if (len % entsize != 0)
- return false;
+ {
+ if (uncompressed_data != NULL)
+ delete[] uncompressed_data;
+ return false;
+ }
this->input_count_ += len / entsize;
if (this->keeps_input_sections())
record_input_section(object, shndx);
+ if (uncompressed_data != NULL)
+ delete[] uncompressed_data;
+
return true;
}
unsigned int shndx)
{
section_size_type len;
+ section_size_type uncompressed_size = 0;
+ unsigned char* uncompressed_data = NULL;
const unsigned char* pdata = object->section_contents(shndx, &len, false);
+ if (object->section_is_compressed(shndx, &uncompressed_size))
+ {
+ uncompressed_data = new unsigned char[uncompressed_size];
+ if (!decompress_input_section(pdata, len, uncompressed_data,
+ uncompressed_size))
+ object->error(_("could not decompress section %s"),
+ object->section_name(shndx).c_str());
+ pdata = uncompressed_data;
+ len = uncompressed_size;
+ }
+
const Char_type* p = reinterpret_cast<const Char_type*>(pdata);
const Char_type* pend = p + len / sizeof(Char_type);
{
object->error(_("mergeable string section length not multiple of "
"character size"));
+ if (uncompressed_data != NULL)
+ delete[] uncompressed_data;
return false;
}
if (this->keeps_input_sections())
record_input_section(object, shndx);
+ if (uncompressed_data != NULL)
+ delete[] uncompressed_data;
+
return true;
}
#include "object.h"
#include "dynobj.h"
#include "plugin.h"
+#include "compressed_output.h"
namespace gold
{
local_got_offsets_(),
kept_comdat_sections_(),
has_eh_frame_(false),
- discarded_eh_frame_shndx_(-1U)
+ discarded_eh_frame_shndx_(-1U),
+ deferred_layout_(),
+ deferred_layout_relocs_(),
+ compressed_sections_()
{
}
return false;
}
+// Build a table for any compressed debug sections, mapping each section index
+// to the uncompressed size.
+
+template<int size, bool big_endian>
+Compressed_section_map*
+build_compressed_section_map(
+ const unsigned char* pshdrs,
+ unsigned int shnum,
+ const char* names,
+ section_size_type names_size,
+ Sized_relobj<size, big_endian>* obj)
+{
+ Compressed_section_map* uncompressed_sizes = new Compressed_section_map();
+ const unsigned int shdr_size = elfcpp::Elf_sizes<size>::shdr_size;
+ const unsigned char* p = pshdrs + shdr_size;
+ for (unsigned int i = 1; i < shnum; ++i, p += shdr_size)
+ {
+ typename elfcpp::Shdr<size, big_endian> shdr(p);
+ if (shdr.get_sh_type() == elfcpp::SHT_PROGBITS
+ && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0)
+ {
+ if (shdr.get_sh_name() >= names_size)
+ {
+ obj->error(_("bad section name offset for section %u: %lu"),
+ i, static_cast<unsigned long>(shdr.get_sh_name()));
+ continue;
+ }
+
+ const char* name = names + shdr.get_sh_name();
+ if (is_compressed_debug_section(name))
+ {
+ section_size_type len;
+ const unsigned char* contents =
+ obj->section_contents(i, &len, false);
+ uint64_t uncompressed_size = get_uncompressed_size(contents, len);
+ if (uncompressed_size != -1ULL)
+ (*uncompressed_sizes)[i] =
+ convert_to_section_size_type(uncompressed_size);
+ }
+ }
+ }
+ return uncompressed_sizes;
+}
+
// Read the sections and symbols from an object file.
template<int size, bool big_endian>
if (this->find_eh_frame(pshdrs, names, sd->section_names_size))
this->has_eh_frame_ = true;
}
+ if (memmem(names, sd->section_names_size, ".zdebug_", 8) != NULL)
+ this->compressed_sections_ =
+ build_compressed_section_map(pshdrs, this->shnum(), names,
+ sd->section_names_size, this);
sd->symbols = NULL;
sd->symbols_size = 0;
set_no_export(bool value)
{ this->no_export_ = value; }
+ // Return TRUE if the section is a compressed debug section, and set
+ // *UNCOMPRESSED_SIZE to the size of the uncompressed data.
+ bool
+ section_is_compressed(unsigned int shndx,
+ section_size_type* uncompressed_size) const
+ { return this->do_section_is_compressed(shndx, uncompressed_size); }
+
protected:
// Returns NULL for Objects that are not plugin objects. This method
// is overridden in the Pluginobj class.
bool
handle_split_stack_section(const char* name);
+ // Return TRUE if the section is a compressed debug section, and set
+ // *UNCOMPRESSED_SIZE to the size of the uncompressed data.
+ virtual bool
+ do_section_is_compressed(unsigned int, section_size_type*) const
+ { return false; }
+
private:
// This class may not be copied.
Object(const Object&);
std::vector<Symbol*> vec_;
};
+// Type for mapping section index to uncompressed size.
+
+typedef std::map<unsigned int, section_size_type> Compressed_section_map;
+
// A regular object file. This is size and endian specific.
template<int size, bool big_endian>
void
set_output_local_symbol_count(unsigned int value)
{ this->output_local_symbol_count_ = value; }
-
+
+ // Return TRUE if the section is a compressed debug section, and set
+ // *UNCOMPRESSED_SIZE to the size of the uncompressed data.
+ bool
+ do_section_is_compressed(unsigned int shndx,
+ section_size_type* uncompressed_size) const
+ {
+ if (this->compressed_sections_ == NULL)
+ return false;
+ Compressed_section_map::const_iterator p =
+ this->compressed_sections_->find(shndx);
+ if (p != this->compressed_sections_->end())
+ {
+ if (uncompressed_size != NULL)
+ *uncompressed_size = p->second;
+ return true;
+ }
+ return false;
+ }
+
private:
// For convenience.
typedef Sized_relobj<size, big_endian> This;
std::vector<Deferred_layout> deferred_layout_;
// The list of relocation sections whose layout was deferred.
std::vector<Deferred_layout> deferred_layout_relocs_;
+ // For compressed debug sections, map section index to uncompressed size.
+ Compressed_section_map* compressed_sections_;
};
// A class to manage the list of all objects.
}
}
+ section_size_type input_section_size = shdr.get_sh_size();
+ section_size_type uncompressed_size;
+ if (object->section_is_compressed(shndx, &uncompressed_size))
+ input_section_size = uncompressed_size;
+
this->set_current_data_size_for_child(aligned_offset_in_section
- + shdr.get_sh_size());
+ + input_section_size);
// We need to keep track of this section if we are already keeping
// track of sections, or if we are relaxing. Also, if this is a
#include "target-reloc.h"
#include "reloc.h"
#include "icf.h"
+#include "compressed_output.h"
namespace gold
{
off_t view_start;
section_size_type view_size;
+ bool must_decompress = false;
if (output_offset != invalid_address)
{
view_start = output_section_offset + output_offset;
view_size = convert_to_section_size_type(shdr.get_sh_size());
+ section_size_type uncompressed_size;
+ if (this->section_is_compressed(i, &uncompressed_size))
+ {
+ view_size = uncompressed_size;
+ must_decompress = true;
+ }
}
else
{
{
unsigned char* buffer = os->postprocessing_buffer();
view = buffer + view_start;
- if (output_offset != invalid_address)
+ if (output_offset != invalid_address && !must_decompress)
{
off_t sh_offset = shdr.get_sh_offset();
if (!rm.empty() && rm.back().file_offset > sh_offset)
else
{
view = of->get_output_view(view_start, view_size);
- off_t sh_offset = shdr.get_sh_offset();
- if (!rm.empty() && rm.back().file_offset > sh_offset)
- is_sorted = false;
- rm.push_back(File_read::Read_multiple_entry(sh_offset,
- view_size, view));
+ if (!must_decompress)
+ {
+ off_t sh_offset = shdr.get_sh_offset();
+ if (!rm.empty() && rm.back().file_offset > sh_offset)
+ is_sorted = false;
+ rm.push_back(File_read::Read_multiple_entry(sh_offset,
+ view_size, view));
+ }
}
}
+ if (must_decompress)
+ {
+ // Read and decompress the section.
+ section_size_type len;
+ const unsigned char* p = this->section_contents(i, &len, false);
+ if (!decompress_input_section(p, len, view, view_size))
+ this->error(_("could not decompress section %s"),
+ this->section_name(i).c_str());
+ }
+
pvs->view = view;
pvs->address = os->address();
if (output_offset != invalid_address)
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