Add --verify-only option to DWP.

gold/
	* dwp.cc (Dwo_file_entry): New type.
	(File_list): Use Dwo_file_entry.
	(Dwo_file::verify): New function.
	(Dwo_file::verify_dwo_list): New function.
	(Dwo_file::sized_verify_dwo_list): New function.
	(Dwo_name_info_reader::visit_compilation_unit): Add dwo_id to file
	list.
	(Dwp_options): New enum type.
	(dwp_options): Add --verify-only.
	(usage): Likewise.
	(main): Likewise.
	* dwp.h (gold_info): Add declaration.
This commit is contained in:
Cary Coutant 2013-05-14 14:19:08 -07:00
parent 7cdd7d57e6
commit 94e49e160d
3 changed files with 211 additions and 9 deletions

View File

@ -1,3 +1,18 @@
2013-11-14 Cary Coutant <ccoutant@google.com>
* dwp.cc (Dwo_file_entry): New type.
(File_list): Use Dwo_file_entry.
(Dwo_file::verify): New function.
(Dwo_file::verify_dwo_list): New function.
(Dwo_file::sized_verify_dwo_list): New function.
(Dwo_name_info_reader::visit_compilation_unit): Add dwo_id to file
list.
(Dwp_options): New enum type.
(dwp_options): Add --verify-only.
(usage): Likewise.
(main): Likewise.
* dwp.h (gold_info): Add declaration.
2013-11-14 Cary Coutant <ccoutant@google.com>
PR gold/14860

View File

@ -60,7 +60,15 @@ template <int size, bool big_endian>
class Sized_relobj_dwo;
// List of .dwo files to process.
typedef std::vector<std::string> File_list;
struct Dwo_file_entry
{
Dwo_file_entry(uint64_t id, std::string name)
: dwo_id(id), dwo_name(name)
{ }
uint64_t dwo_id;
std::string dwo_name;
};
typedef std::vector<Dwo_file_entry> File_list;
// Type to hold the offset and length of an input section
// within an output section.
@ -115,6 +123,12 @@ class Dwo_file
void
read(Dwp_output_file* output_file);
// Verify a .dwp file given a list of .dwo files referenced by the
// corresponding executable file. Returns true if no problems
// were found.
bool
verify(const File_list& files);
private:
// Types for mapping input string offsets to output string offsets.
typedef std::pair<section_offset_type, section_offset_type>
@ -174,6 +188,16 @@ class Dwo_file
sized_read_unit_index(unsigned int, unsigned int *, Dwp_output_file*,
bool is_tu_index);
// Verify the .debug_cu_index section of a .dwp file, comparing it
// against the list of .dwo files referenced by the corresponding
// executable file.
bool
verify_dwo_list(unsigned int, const File_list& files);
template <bool big_endian>
bool
sized_verify_dwo_list(unsigned int, const File_list& files);
// Merge the input string table section into the output file.
void
add_strings(Dwp_output_file*, unsigned int);
@ -969,6 +993,48 @@ Dwo_file::read(Dwp_output_file* output_file)
}
}
// Verify a .dwp file given a list of .dwo files referenced by the
// corresponding executable file. Returns true if no problems
// were found.
bool
Dwo_file::verify(const File_list& files)
{
this->obj_ = this->make_object(NULL);
unsigned int shnum = this->shnum();
this->is_compressed_.resize(shnum);
this->sect_offsets_.resize(shnum);
unsigned int debug_cu_index = 0;
// Scan the section table and collect debug sections.
// (Section index 0 is a dummy section; skip it.)
for (unsigned int i = 1; i < shnum; i++)
{
if (this->section_type(i) != elfcpp::SHT_PROGBITS)
continue;
std::string sect_name = this->section_name(i);
const char* suffix = sect_name.c_str();
if (is_prefix_of(".debug_", suffix))
suffix += 7;
else if (is_prefix_of(".zdebug_", suffix))
{
this->is_compressed_[i] = true;
suffix += 8;
}
else
continue;
if (strcmp(suffix, "cu_index") == 0)
debug_cu_index = i;
}
if (debug_cu_index == 0)
gold_fatal(_("%s: no .debug_cu_index section found"), this->name_);
return this->verify_dwo_list(debug_cu_index, files);
}
// Create a Sized_relobj_dwo of the given size and endianness,
// and record the target info.
@ -1211,6 +1277,102 @@ Dwo_file::sized_read_unit_index(unsigned int shndx,
delete[] info_contents;
}
// Verify the .debug_cu_index section of a .dwp file, comparing it
// against the list of .dwo files referenced by the corresponding
// executable file.
bool
Dwo_file::verify_dwo_list(unsigned int shndx, const File_list& files)
{
if (this->obj_->is_big_endian())
return this->sized_verify_dwo_list<true>(shndx, files);
else
return this->sized_verify_dwo_list<false>(shndx, files);
}
template <bool big_endian>
bool
Dwo_file::sized_verify_dwo_list(unsigned int shndx, const File_list& files)
{
gold_assert(shndx > 0);
section_size_type index_len;
bool index_is_new;
const unsigned char* contents =
this->section_contents(shndx, &index_len, &index_is_new);
unsigned int version =
elfcpp::Swap_unaligned<32, big_endian>::readval(contents);
// We don't support version 1 anymore because it was experimental
// and because in normal use, dwp is not expected to read .dwp files
// produced by an earlier version of the tool.
if (version != 2)
gold_fatal(_("%s: section %s has unsupported version number %d"),
this->name_, this->section_name(shndx).c_str(), version);
unsigned int ncols =
elfcpp::Swap_unaligned<32, big_endian>::readval(contents
+ sizeof(uint32_t));
unsigned int nused =
elfcpp::Swap_unaligned<32, big_endian>::readval(contents
+ 2 * sizeof(uint32_t));
if (ncols == 0 || nused == 0)
return true;
unsigned int nslots =
elfcpp::Swap_unaligned<32, big_endian>::readval(contents
+ 3 * sizeof(uint32_t));
const unsigned char* phash = contents + 4 * sizeof(uint32_t);
const unsigned char* pindex = phash + nslots * sizeof(uint64_t);
const unsigned char* pcolhdrs = pindex + nslots * sizeof(uint32_t);
const unsigned char* poffsets = pcolhdrs + ncols * sizeof(uint32_t);
const unsigned char* psizes = poffsets + nused * ncols * sizeof(uint32_t);
const unsigned char* pend = psizes + nused * ncols * sizeof(uint32_t);
if (pend > contents + index_len)
gold_fatal(_("%s: section %s is corrupt"), this->name_,
this->section_name(shndx).c_str());
int nmissing = 0;
for (File_list::const_iterator f = files.begin(); f != files.end(); ++f)
{
uint64_t dwo_id = f->dwo_id;
unsigned int slot = static_cast<unsigned int>(dwo_id) & (nslots - 1);
const unsigned char* ph = phash + slot * sizeof(uint64_t);
const unsigned char* pi = pindex + slot * sizeof(uint32_t);
uint64_t probe = elfcpp::Swap_unaligned<64, big_endian>::readval(ph);
uint32_t row_index = elfcpp::Swap_unaligned<32, big_endian>::readval(pi);
if (row_index != 0 && probe != dwo_id)
{
unsigned int h2 = ((static_cast<unsigned int>(dwo_id >> 32)
& (nslots - 1)) | 1);
do
{
slot = (slot + h2) & (nslots - 1);
ph = phash + slot * sizeof(uint64_t);
pi = pindex + slot * sizeof(uint32_t);
probe = elfcpp::Swap_unaligned<64, big_endian>::readval(ph);
row_index = elfcpp::Swap_unaligned<32, big_endian>::readval(pi);
} while (row_index != 0 && probe != dwo_id);
}
if (row_index == 0)
{
printf(_("missing .dwo file: %016llx %s\n"),
static_cast<long long>(dwo_id), f->dwo_name.c_str());
++nmissing;
}
}
gold_info(_("Found %d missing .dwo files"), nmissing);
if (index_is_new)
delete[] contents;
return nmissing == 0;
}
// Merge the input string table section into the output file.
void
@ -2063,7 +2225,10 @@ Dwo_name_info_reader::visit_compilation_unit(off_t, off_t, Dwarf_die* die)
{
const char* dwo_name = die->string_attribute(elfcpp::DW_AT_GNU_dwo_name);
if (dwo_name != NULL)
this->files_->push_back(dwo_name);
{
uint64_t dwo_id = die->uint_attribute(elfcpp::DW_AT_GNU_dwo_id);
this->files_->push_back(Dwo_file_entry(dwo_id, dwo_name));
}
}
// Class Unit_reader.
@ -2138,12 +2303,17 @@ using namespace gold;
// Options.
enum Dwp_options {
VERIFY_ONLY = 0x101,
};
struct option dwp_options[] =
{
{ "exec", required_argument, NULL, 'e' },
{ "help", no_argument, NULL, 'h' },
{ "output", required_argument, NULL, 'o' },
{ "verbose", no_argument, NULL, 'v' },
{ "verify-only", no_argument, NULL, VERIFY_ONLY },
{ "version", no_argument, NULL, 'V' },
{ NULL, 0, NULL, 0 }
};
@ -2156,9 +2326,11 @@ usage(FILE* fd, int exit_status)
fprintf(fd, _("Usage: %s [options] [file...]\n"), program_name);
fprintf(fd, _(" -h, --help Print this help message\n"));
fprintf(fd, _(" -e EXE, --exec EXE Get list of dwo files from EXE"
" (defaults output to EXE.dwp)\n"));
" (defaults output to EXE.dwp)\n"));
fprintf(fd, _(" -o FILE, --output FILE Set output dwp file name\n"));
fprintf(fd, _(" -v, --verbose Verbose output\n"));
fprintf(fd, _(" --verify-only Verify output file against"
" exec file\n"));
fprintf(fd, _(" -V, --version Print version number\n"));
// REPORT_BUGS_TO is defined in bfd/bfdver.h.
@ -2218,6 +2390,7 @@ main(int argc, char** argv)
std::string output_filename;
const char* exe_filename = NULL;
bool verbose = false;
bool verify_only = false;
int c;
while ((c = getopt_long(argc, argv, "e:ho:vV", dwp_options, NULL)) != -1)
{
@ -2234,6 +2407,9 @@ main(int argc, char** argv)
case 'v':
verbose = true;
break;
case VERIFY_ONLY:
verify_only = true;
break;
case 'V':
print_version();
case '?':
@ -2250,8 +2426,6 @@ main(int argc, char** argv)
output_filename.append(".dwp");
}
Dwp_output_file output_file(output_filename.c_str());
// Get list of .dwo files from the executable.
if (exe_filename != NULL)
{
@ -2261,20 +2435,29 @@ main(int argc, char** argv)
// Add any additional files listed on command line.
for (int i = optind; i < argc; ++i)
files.push_back(argv[i]);
files.push_back(Dwo_file_entry(0, argv[i]));
if (exe_filename == NULL && files.empty())
gold_fatal(_("no input files and no executable specified"));
if (verify_only)
{
// Get list of DWO files in the DWP file and compare with
// references found in the EXE file.
Dwo_file dwp_file(output_filename.c_str());
bool ok = dwp_file.verify(files);
return ok ? EXIT_SUCCESS : EXIT_FAILURE;
}
// Process each file, adding its contents to the output file.
Dwp_output_file output_file(output_filename.c_str());
for (File_list::const_iterator f = files.begin(); f != files.end(); ++f)
{
if (verbose)
fprintf(stderr, "%s\n", f->c_str());
Dwo_file dwo_file(f->c_str());
fprintf(stderr, "%s\n", f->dwo_name.c_str());
Dwo_file dwo_file(f->dwo_name.c_str());
dwo_file.read(&output_file);
}
output_file.finalize();
return EXIT_SUCCESS;

View File

@ -88,6 +88,10 @@ gold_fatal(const char* format, ...) ATTRIBUTE_NORETURN ATTRIBUTE_PRINTF_1;
extern void
gold_warning(const char* msg, ...) ATTRIBUTE_PRINTF_1;
// This function is called to print an informational message.
extern void
gold_info(const char* msg, ...) ATTRIBUTE_PRINTF_1;
#define gold_unreachable() \
(gold::do_gold_unreachable(__FILE__, __LINE__, \
static_cast<const char*>(__FUNCTION__)))