mirror of
https://github.com/revng/revng
synced 2026-06-21 14:07:57 +00:00
Alessandro Di Federico
6894862ef2
Refactor the binary import and dependency resolution infrastructure to support multiple platforms (Linux, Windows, macOS) via a configuration-driven root system. Major changes: * Overhaul PDB and DWARF importers for platform-aware debug info loading. * Refactor LDDTree into a template-based architecture with platform-specific implementations (ELF, PE/COFF). * Mostly rewrite the PDB importer, which had significant limitations.
538 lines
18 KiB
C++
538 lines
18 KiB
C++
#pragma once
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//
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// This file is distributed under the MIT License. See LICENSE.md for details.
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//
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#include <concepts>
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#include <optional>
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#include "llvm/ADT/StringExtras.h"
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#include "llvm/BinaryFormat/ELF.h"
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#include "llvm/Object/ELFObjectFile.h"
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#include "llvm/Support/Endian.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/Path.h"
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#include "llvm/Support/Progress.h"
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#include "revng/Model/Importer/Binary/BinaryDescriptor.h"
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#include "revng/Model/Importer/DebugInfo/DwarfImporter.h"
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#include "revng/Support/Configuration.h"
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#include "revng/Support/Debug.h"
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#include "revng/Support/Generator.h"
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#include "revng/Support/ObjectFile.h"
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#include "revng/Support/PathList.h"
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#include "ImportDebugInfoHelper.h"
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inline const std::string GlobalDebugDirectory = "/usr/lib/debug/";
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inline cppcoro::generator<const llvm::sys::fs::directory_entry &>
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listDirectory(const llvm::SmallString<16> &Path) {
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using namespace llvm::sys::fs;
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revng_log(DILogger, "Listing " << Path.str());
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std::error_code EC;
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auto DirectoryIt = directory_iterator(Path, EC);
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if (EC) {
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revng_log(DILogger,
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"Error enumerating " << Path.str() << ": " << EC.message());
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} else {
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for (const directory_iterator EndIt; DirectoryIt != EndIt;
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DirectoryIt.increment(EC)) {
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const auto &Entry = *DirectoryIt;
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co_yield Entry;
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}
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}
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}
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inline uint32_t gnuDebugLinkCRC32(llvm::ArrayRef<uint8_t> Data) {
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static const uint32_t Table[256] = {
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0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f,
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0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
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0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2,
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0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
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0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9,
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0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
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0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c,
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0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
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0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423,
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0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
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0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106,
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0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
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0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d,
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0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
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0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950,
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0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
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0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7,
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0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
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0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa,
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0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
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0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81,
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0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
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0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84,
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0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
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0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb,
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0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
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0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e,
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0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
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0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55,
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0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
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0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28,
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0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
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0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f,
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0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
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0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242,
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0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
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0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69,
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0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
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0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc,
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0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
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0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693,
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0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
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0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d
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};
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uint32_t Result = 0;
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Result = ~Result & 0xffffffff;
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for (uint8_t Byte : Data)
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Result = Table[(Result ^ Byte) & 0xff] ^ (Result >> 8);
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return ~Result & 0xffffffff;
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}
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template<IsELFObjectFile T>
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class DwarfDebugInfoFinder {
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public:
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const revng::RootEntry &Root;
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const ELFBinary &Binary;
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const T &ObjectFile;
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private:
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DwarfDebugInfoFinder(const revng::RootEntry &Root,
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const ELFBinary &Binary,
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const T &ObjectFile) :
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Root(Root), Binary(Binary), ObjectFile(ObjectFile) {}
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public:
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static std::string find(const revng::RootEntry &Root,
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const ELFBinary &Binary,
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const T &ObjectFile) {
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DwarfDebugInfoFinder Finder(Root, Binary, ObjectFile);
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return Finder.find();
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}
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private:
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std::string find() {
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using namespace llvm;
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revng_log(DILogger, "Looking for separate debug info");
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LoggerIndent Indent(DILogger);
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llvm::Task T1(3, "Looking for separate debug info");
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std::string SeparateDebugInfoPath;
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// Try to identify the separate debug info file locally
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revng_log(DILogger, "Searching locally");
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T1.advance("Searching locally", true);
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LoggerIndent Indent2(DILogger);
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SeparateDebugInfoPath = getSeparateDebugInfo();
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if (SeparateDebugInfoPath.empty()) {
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// We couldn't find locally, run fetch-debuginfo and try again
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revng_log(DILogger, "Fetching debug info remotely");
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T1.advance("Fetching debug info remotely", true);
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LoggerIndent Indent(DILogger);
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int ExitCode = runFetchDebugInfo(Binary.FullPathForExternalTools,
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DILogger.isEnabled());
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if (ExitCode == 0) {
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revng_log(DILogger, "Searching locally again");
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T1.advance("Searching locally again", true);
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LoggerIndent Indent(DILogger);
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SeparateDebugInfoPath = getSeparateDebugInfo();
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} else {
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revng_log(DILogger,
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"Failed to find debug info with `revng model "
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"fetch-debuginfo`.");
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}
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}
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return SeparateDebugInfoPath;
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}
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std::string getSeparateDebugInfo() {
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// First, use build-id in all of its forms, i.e., .note.gnu.build-id and
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// .gnu_debuglink.
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// Then consider .gnu_debugaltlink and manual look up by .debug suffix
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// (e.g., bash.debug).
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std::string Path = processBuildID();
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if (Path.size() == 0) {
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Path = processGnuDebugLink();
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}
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if (Path.size() == 0) {
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Path = processGnuDebugAltLink();
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}
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if (Path.size() == 0) {
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Path = processDotDebugFile();
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}
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if (Path.size() == 0) {
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revng_log(DILogger, "Not found");
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} else {
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revng_log(DILogger, "Found: " << Path);
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}
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return Path;
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}
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std::string processBuildID() {
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revng_log(DILogger, "Processing build ID");
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LoggerIndent Indent(DILogger);
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std::string BuildID = getBuildID();
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if (BuildID.size() == 0) {
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revng_log(DILogger, "Can't parse build-id.");
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return "";
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}
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revng_log(DILogger, "Build-id: " << BuildID);
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llvm::SmallString<128> ResultPath;
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{
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// First two chars of build-id forms the debug info file directory.
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auto DebugDir = BuildID.substr(0, 2);
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// The rest of build-id forms the debug info file name.
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auto DebugFile = BuildID.substr(2);
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auto DebugFileWithExtension = DebugFile.append(".debug");
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llvm::sys::path::append(ResultPath,
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GlobalDebugDirectory,
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".build-id/",
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DebugDir,
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DebugFileWithExtension);
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if (auto MaybeFullPath = Root.getExistingPath(ResultPath.str())) {
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revng_log(DILogger, "Debug info found in " << *MaybeFullPath);
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return *MaybeFullPath;
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}
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}
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// Try in revng's debug symbols cache
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ResultPath.clear();
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std::string CacheDir = getCacheDirectory();
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ResultPath = joinPath(CacheDir, "debug-symbols", "elf", BuildID, "debug");
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if (fileExists(ResultPath.str())) {
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revng_log(DILogger, "Debug info found in cache: " << ResultPath.str());
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return ResultPath.str().str();
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}
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revng_log(DILogger, "Processing build-id did not lead to an existing file");
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return "";
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}
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llvm::ArrayRef<uint8_t> findELFNote(llvm::StringRef Name, uint32_t Type) {
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const auto &ELF = ObjectFile.getELFFile();
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auto MaybeProgramHeaders = ELF.program_headers();
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if (not MaybeProgramHeaders) {
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std::string Message = llvm::toString(MaybeProgramHeaders.takeError());
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revng_log(DILogger, "Couldn't parse program headers: " << Message);
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return {};
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}
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for (const auto &ProgramHeader : *MaybeProgramHeaders) {
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if (ProgramHeader.p_type != llvm::ELF::PT_NOTE)
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continue;
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llvm::Error NotesError = llvm::Error::success();
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for (const auto &ELFNote : ELF.notes(ProgramHeader, NotesError)) {
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if (ELFNote.getName() == Name and ELFNote.getType() == Type) {
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return ELFNote.getDesc();
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}
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}
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if (NotesError) {
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std::string Message = llvm::toString(std::move(NotesError));
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revng_log(DILogger, "Failed to parse notes: " << Message);
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return {};
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}
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}
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return {};
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}
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std::string getBuildID() {
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using namespace llvm;
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const auto &ELF = ObjectFile.getELFFile();
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// This is the correct way to identify .note.gnu.build-id
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ArrayRef<uint8_t> Contents = findELFNote("GNU", ELF::NT_GNU_BUILD_ID);
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if (Contents.size() <= 2) {
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// We want at least two bytes
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revng_log(DILogger, "Empty build-id found, skipping");
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return "";
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}
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std::string StringForBytes;
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{
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// Convert to hex
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raw_string_ostream OutputStream(StringForBytes);
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for (uint8_t Byte : Contents)
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OutputStream << format_hex_no_prefix(Byte, 2);
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}
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return StringForBytes;
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}
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std::string processGnuDebugLink() {
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revng_log(DILogger, "Processing .gnu_debuglink");
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LoggerIndent Indent(DILogger);
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auto [Path, Rest] = getStringFromSection(".gnu_debuglink");
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// .gnu_debuglink contains something like
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// d12d07f91f419ba28f2ab11d96355a54b0c2c2.debug or libc-2.31.so (which
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// could resolve to the input binary itself), followed by 0 to 3 bytes to
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// reach 4-bytes alignment and then a 4-bytes CRC.
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// Bail out if it's a path, as opposed to just a file name
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if (Path.contains("/")) {
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revng_log(DILogger,
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".gnu_debuglink contains /, unexpected, bailing out.");
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return "";
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}
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if (Path.size() == 0)
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return {};
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// Collect the CRC
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if (Rest.size() < 4) {
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revng_log(DILogger, "No CRC found in .gnu_debuglink");
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return "";
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}
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using namespace llvm::object;
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bool IsLittleEndian = true;
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llvm::support::endianness Endianness = llvm::support::little;
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if constexpr (std::is_same_v<T, ELF32BEObjectFile>
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or std::is_same_v<T, ELF64BEObjectFile>) {
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Endianness = llvm::support::big;
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}
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auto CRC = llvm::support::endian::read<uint32_t>(Rest.end() - 4,
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Endianness);
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return findByName(Path, CRC);
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}
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std::string processGnuDebugAltLink() {
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revng_log(DILogger, "Processing .gnu_debugaltlink");
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LoggerIndent Indent(DILogger);
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// Look for the absolute path
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auto [Path, _] = getStringFromSection(".gnu_debugaltlink");
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if (Path.size() == 0)
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return {};
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if (auto MaybeFullPath = Root.getExistingPath(Path)) {
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return *MaybeFullPath;
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}
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// Not found: extract the file name and look in canonical places
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auto FileName = llvm::sys::path::filename(Path);
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return findByName(FileName, std::nullopt);
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}
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std::string processDotDebugFile() {
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revng_log(DILogger, "Processing the .debug file");
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LoggerIndent Indent(DILogger);
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auto FileName = llvm::sys::path::filename(Binary.canonicalPath());
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if (FileName.empty())
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return "";
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return findByName((llvm::Twine(FileName) + ".debug").str(), std::nullopt);
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}
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private:
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llvm::ArrayRef<uint8_t> getSectionsContents(llvm::StringRef Name) {
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auto ELF = ObjectFile.getELFFile();
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auto MaybeSections = ELF.sections();
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if (auto Error = MaybeSections.takeError()) {
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// TODO: emit a diagnostic message for the user.
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revng_log(DILogger, "Failed to get sections: " << Error);
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consumeError(std::move(Error));
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return {};
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}
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for (const auto &Section : *MaybeSections) {
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auto MaybeName = expectedToOptional(ELF.getSectionName(Section));
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if (MaybeName and *MaybeName == Name) {
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auto MaybeContents = expectedToOptional(ELF
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.getSectionContents(Section));
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if (MaybeContents)
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return *MaybeContents;
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}
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}
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return {};
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}
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std::pair<llvm::StringRef, llvm::ArrayRef<uint8_t>>
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getStringFromSection(llvm::StringRef Name) {
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using namespace llvm;
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auto ELF = ObjectFile.getELFFile();
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ArrayRef<uint8_t> SectionData = getSectionsContents(Name);
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if (SectionData.size() == 0)
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return {};
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for (auto [Index, Byte] : llvm::enumerate(SectionData)) {
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if (Byte == 0) {
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const char *Start = reinterpret_cast<const char *>(SectionData.data());
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return { StringRef(Start, Index), SectionData.slice(Index + 1) };
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}
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}
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return { {}, SectionData };
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}
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std::optional<std::string> getPathWithCRC(llvm::StringRef RootRelativePath,
|
|
std::optional<uint32_t> CRC) {
|
|
auto MaybePath = Root.getExistingPath(RootRelativePath);
|
|
if (not MaybePath)
|
|
return std::nullopt;
|
|
|
|
if (CRC.has_value()) {
|
|
revng_log(DILogger,
|
|
"Checking if CRC is 0x" << llvm::utohexstr(*CRC, true));
|
|
LoggerIndent Indent(DILogger);
|
|
|
|
auto MaybeFile = llvm::MemoryBuffer::getFile(*MaybePath, false, false);
|
|
if (std::error_code ErrorCode = MaybeFile.getError()) {
|
|
revng_log(DILogger,
|
|
"Error opening the file to compute the CRC: " << ErrorCode);
|
|
return std::nullopt;
|
|
}
|
|
|
|
auto ContentString = MaybeFile->get()->getBuffer();
|
|
auto *Pointer = reinterpret_cast<const uint8_t *>(ContentString.data());
|
|
auto ContentArray = llvm::ArrayRef<uint8_t>(Pointer,
|
|
ContentString.size());
|
|
|
|
if (gnuDebugLinkCRC32(ContentArray) != *CRC) {
|
|
revng_log(DILogger, "CRC mismatch");
|
|
return std::nullopt;
|
|
}
|
|
}
|
|
|
|
return MaybePath;
|
|
}
|
|
|
|
std::string findByName(llvm::StringRef Name, std::optional<uint32_t> CRC) {
|
|
revng_assert(not Name.empty());
|
|
|
|
using namespace llvm::sys::path;
|
|
using namespace llvm::sys::fs;
|
|
auto BinaryCanonicalPath = Binary.canonicalPath();
|
|
bool HasAbsoluteCanonicalPath = is_absolute(BinaryCanonicalPath)
|
|
and has_parent_path(BinaryCanonicalPath);
|
|
|
|
revng_log(DILogger,
|
|
"Looking for \"" << Name << "\" for \"" << BinaryCanonicalPath
|
|
<< "\"");
|
|
LoggerIndent Indent(DILogger);
|
|
|
|
// If the binary canonical path is `/usr/bin/ls`, we look for:
|
|
//
|
|
// * /usr/bin/$DEBUG_FILE_NAME
|
|
// * /usr/bin/.debug/$DEBUG_FILE_NAME
|
|
// * /usr/lib/debug/usr/bin/$DEBUG_FILE_NAME
|
|
// * /usr/lib/debug/.build-id/*/$DEBUG_FILE_NAME
|
|
//
|
|
// Typically $DEBUG_FILE_NAME is ls.debug or
|
|
// d12d07f91f419ba28f2ab11d96355a54b0c2c2.debug
|
|
//
|
|
// Note: in theory we could look in $XDG_CACHE_DIR/revng/debug-symbols/elf/
|
|
// as well but we store files as $BUILD_ID/debug. Also, $BUILD_ID is the
|
|
// full build-id, while the name we get here is stripped of the first byte
|
|
// (two hex-digits).
|
|
|
|
llvm::SmallString<128> ResultPath;
|
|
|
|
if (HasAbsoluteCanonicalPath) {
|
|
// Try in the same directory
|
|
append(ResultPath, parent_path(BinaryCanonicalPath), Name);
|
|
|
|
if (auto MaybeFullPath = getPathWithCRC(ResultPath.str(), CRC)) {
|
|
return *MaybeFullPath;
|
|
}
|
|
|
|
// Try in .debug/ directory.
|
|
ResultPath.clear();
|
|
append(ResultPath, parent_path(BinaryCanonicalPath), ".debug/", Name);
|
|
|
|
if (auto MaybeFullPath = getPathWithCRC(ResultPath.str(), CRC)) {
|
|
return *MaybeFullPath;
|
|
}
|
|
|
|
// Try `/usr/lib/debug/usr/bin/ls.debug`-like path.
|
|
ResultPath.clear();
|
|
append(ResultPath,
|
|
GlobalDebugDirectory,
|
|
parent_path(BinaryCanonicalPath),
|
|
Name);
|
|
|
|
if (auto MaybeFullPath = getPathWithCRC(ResultPath.str(), CRC)) {
|
|
return *MaybeFullPath;
|
|
}
|
|
}
|
|
|
|
// Look in /usr/lib/debug/.build-id/*/
|
|
// TODO: enumerating all the directories in .build-id is not very nice.
|
|
llvm::SmallString<16> BasePath;
|
|
append(BasePath, Root.Path, GlobalDebugDirectory, ".build-id");
|
|
|
|
for (const auto &Entry : listDirectory(BasePath)) {
|
|
if (Entry.type() != file_type::directory_file)
|
|
continue;
|
|
|
|
auto DirectoryName = filename(Entry.path());
|
|
ResultPath.clear();
|
|
append(ResultPath,
|
|
GlobalDebugDirectory,
|
|
".build-id",
|
|
DirectoryName,
|
|
Name);
|
|
|
|
if (auto MaybeFullPath = getPathWithCRC(ResultPath.str(), CRC)) {
|
|
return *MaybeFullPath;
|
|
}
|
|
}
|
|
|
|
return {};
|
|
}
|
|
|
|
bool fileExists(const llvm::Twine &Path) const {
|
|
using namespace llvm::sys;
|
|
revng_assert(not Path.str().empty());
|
|
bool Result = fs::exists(Path);
|
|
if (not Result)
|
|
revng_log(DILogger, "No file at the following path: " << Path.str());
|
|
return Result;
|
|
}
|
|
};
|