From 94e49e160d0c3f0b1b838f9963b1da5d3cfc795b Mon Sep 17 00:00:00 2001 From: Cary Coutant Date: Tue, 14 May 2013 14:19:08 -0700 Subject: [PATCH] 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. --- gold/ChangeLog | 15 ++++ gold/dwp.cc | 201 ++++++++++++++++++++++++++++++++++++++++++++++--- gold/dwp.h | 4 + 3 files changed, 211 insertions(+), 9 deletions(-) diff --git a/gold/ChangeLog b/gold/ChangeLog index 5f225790c42..a56044cac2d 100644 --- a/gold/ChangeLog +++ b/gold/ChangeLog @@ -1,3 +1,18 @@ +2013-11-14 Cary Coutant + + * 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 PR gold/14860 diff --git a/gold/dwp.cc b/gold/dwp.cc index c6453bfdef1..04a144735eb 100644 --- a/gold/dwp.cc +++ b/gold/dwp.cc @@ -60,7 +60,15 @@ template class Sized_relobj_dwo; // List of .dwo files to process. -typedef std::vector 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 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 @@ -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 + 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(shndx, files); + else + return this->sized_verify_dwo_list(shndx, files); +} + +template +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(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(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(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; diff --git a/gold/dwp.h b/gold/dwp.h index 25d4f680b12..948c6a9defa 100644 --- a/gold/dwp.h +++ b/gold/dwp.h @@ -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(__FUNCTION__))) -- 2.30.2