671 lines
25 KiB
C++
671 lines
25 KiB
C++
//===-- DWARFDebugLine.cpp ------------------------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "DWARFDebugLine.h"
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#include "llvm/Support/Dwarf.h"
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#include "llvm/Support/Format.h"
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#include "llvm/Support/Path.h"
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#include "llvm/Support/raw_ostream.h"
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#include <algorithm>
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using namespace llvm;
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using namespace dwarf;
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typedef DILineInfoSpecifier::FileLineInfoKind FileLineInfoKind;
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DWARFDebugLine::Prologue::Prologue() {
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clear();
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}
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void DWARFDebugLine::Prologue::clear() {
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TotalLength = Version = PrologueLength = 0;
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MinInstLength = MaxOpsPerInst = DefaultIsStmt = LineBase = LineRange = 0;
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OpcodeBase = 0;
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StandardOpcodeLengths.clear();
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IncludeDirectories.clear();
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FileNames.clear();
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}
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void DWARFDebugLine::Prologue::dump(raw_ostream &OS) const {
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OS << "Line table prologue:\n"
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<< format(" total_length: 0x%8.8x\n", TotalLength)
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<< format(" version: %u\n", Version)
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<< format(" prologue_length: 0x%8.8x\n", PrologueLength)
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<< format(" min_inst_length: %u\n", MinInstLength)
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<< format(Version >= 4 ? "max_ops_per_inst: %u\n" : "", MaxOpsPerInst)
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<< format(" default_is_stmt: %u\n", DefaultIsStmt)
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<< format(" line_base: %i\n", LineBase)
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<< format(" line_range: %u\n", LineRange)
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<< format(" opcode_base: %u\n", OpcodeBase);
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for (uint32_t i = 0; i < StandardOpcodeLengths.size(); ++i)
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OS << format("standard_opcode_lengths[%s] = %u\n", LNStandardString(i+1),
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StandardOpcodeLengths[i]);
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if (!IncludeDirectories.empty())
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for (uint32_t i = 0; i < IncludeDirectories.size(); ++i)
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OS << format("include_directories[%3u] = '", i+1)
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<< IncludeDirectories[i] << "'\n";
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if (!FileNames.empty()) {
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OS << " Dir Mod Time File Len File Name\n"
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<< " ---- ---------- ---------- -----------"
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"----------------\n";
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for (uint32_t i = 0; i < FileNames.size(); ++i) {
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const FileNameEntry& fileEntry = FileNames[i];
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OS << format("file_names[%3u] %4" PRIu64 " ", i+1, fileEntry.DirIdx)
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<< format("0x%8.8" PRIx64 " 0x%8.8" PRIx64 " ",
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fileEntry.ModTime, fileEntry.Length)
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<< fileEntry.Name << '\n';
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}
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}
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}
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bool DWARFDebugLine::Prologue::parse(DataExtractor debug_line_data,
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uint32_t *offset_ptr) {
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const uint32_t prologue_offset = *offset_ptr;
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clear();
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TotalLength = debug_line_data.getU32(offset_ptr);
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Version = debug_line_data.getU16(offset_ptr);
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if (Version < 2)
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return false;
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PrologueLength = debug_line_data.getU32(offset_ptr);
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const uint32_t end_prologue_offset = PrologueLength + *offset_ptr;
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MinInstLength = debug_line_data.getU8(offset_ptr);
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if (Version >= 4)
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MaxOpsPerInst = debug_line_data.getU8(offset_ptr);
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DefaultIsStmt = debug_line_data.getU8(offset_ptr);
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LineBase = debug_line_data.getU8(offset_ptr);
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LineRange = debug_line_data.getU8(offset_ptr);
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OpcodeBase = debug_line_data.getU8(offset_ptr);
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StandardOpcodeLengths.reserve(OpcodeBase - 1);
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for (uint32_t i = 1; i < OpcodeBase; ++i) {
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uint8_t op_len = debug_line_data.getU8(offset_ptr);
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StandardOpcodeLengths.push_back(op_len);
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}
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while (*offset_ptr < end_prologue_offset) {
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const char *s = debug_line_data.getCStr(offset_ptr);
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if (s && s[0])
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IncludeDirectories.push_back(s);
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else
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break;
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}
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while (*offset_ptr < end_prologue_offset) {
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const char *name = debug_line_data.getCStr(offset_ptr);
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if (name && name[0]) {
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FileNameEntry fileEntry;
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fileEntry.Name = name;
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fileEntry.DirIdx = debug_line_data.getULEB128(offset_ptr);
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fileEntry.ModTime = debug_line_data.getULEB128(offset_ptr);
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fileEntry.Length = debug_line_data.getULEB128(offset_ptr);
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FileNames.push_back(fileEntry);
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} else {
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break;
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}
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}
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if (*offset_ptr != end_prologue_offset) {
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fprintf(stderr, "warning: parsing line table prologue at 0x%8.8x should"
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" have ended at 0x%8.8x but it ended at 0x%8.8x\n",
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prologue_offset, end_prologue_offset, *offset_ptr);
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return false;
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}
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return true;
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}
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DWARFDebugLine::Row::Row(bool default_is_stmt) {
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reset(default_is_stmt);
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}
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void DWARFDebugLine::Row::postAppend() {
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BasicBlock = false;
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PrologueEnd = false;
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EpilogueBegin = false;
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}
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void DWARFDebugLine::Row::reset(bool default_is_stmt) {
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Address = 0;
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Line = 1;
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Column = 0;
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File = 1;
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Isa = 0;
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Discriminator = 0;
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IsStmt = default_is_stmt;
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BasicBlock = false;
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EndSequence = false;
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PrologueEnd = false;
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EpilogueBegin = false;
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}
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void DWARFDebugLine::Row::dump(raw_ostream &OS) const {
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OS << format("0x%16.16" PRIx64 " %6u %6u", Address, Line, Column)
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<< format(" %6u %3u %13u ", File, Isa, Discriminator)
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<< (IsStmt ? " is_stmt" : "")
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<< (BasicBlock ? " basic_block" : "")
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<< (PrologueEnd ? " prologue_end" : "")
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<< (EpilogueBegin ? " epilogue_begin" : "")
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<< (EndSequence ? " end_sequence" : "")
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<< '\n';
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}
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DWARFDebugLine::Sequence::Sequence() {
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reset();
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}
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void DWARFDebugLine::Sequence::reset() {
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LowPC = 0;
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HighPC = 0;
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FirstRowIndex = 0;
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LastRowIndex = 0;
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Empty = true;
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}
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DWARFDebugLine::LineTable::LineTable() {
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clear();
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}
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void DWARFDebugLine::LineTable::dump(raw_ostream &OS) const {
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Prologue.dump(OS);
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OS << '\n';
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if (!Rows.empty()) {
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OS << "Address Line Column File ISA Discriminator Flags\n"
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<< "------------------ ------ ------ ------ --- ------------- "
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"-------------\n";
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for (const Row &R : Rows) {
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R.dump(OS);
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}
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}
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}
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void DWARFDebugLine::LineTable::clear() {
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Prologue.clear();
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Rows.clear();
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Sequences.clear();
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}
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DWARFDebugLine::ParsingState::ParsingState(struct LineTable *LT)
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: LineTable(LT), RowNumber(0) {
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resetRowAndSequence();
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}
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void DWARFDebugLine::ParsingState::resetRowAndSequence() {
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Row.reset(LineTable->Prologue.DefaultIsStmt);
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Sequence.reset();
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}
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void DWARFDebugLine::ParsingState::appendRowToMatrix(uint32_t offset) {
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if (Sequence.Empty) {
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// Record the beginning of instruction sequence.
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Sequence.Empty = false;
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Sequence.LowPC = Row.Address;
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Sequence.FirstRowIndex = RowNumber;
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}
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++RowNumber;
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LineTable->appendRow(Row);
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if (Row.EndSequence) {
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// Record the end of instruction sequence.
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Sequence.HighPC = Row.Address;
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Sequence.LastRowIndex = RowNumber;
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if (Sequence.isValid())
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LineTable->appendSequence(Sequence);
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Sequence.reset();
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}
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Row.postAppend();
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}
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const DWARFDebugLine::LineTable *
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DWARFDebugLine::getLineTable(uint32_t offset) const {
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LineTableConstIter pos = LineTableMap.find(offset);
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if (pos != LineTableMap.end())
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return &pos->second;
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return nullptr;
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}
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const DWARFDebugLine::LineTable *
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DWARFDebugLine::getOrParseLineTable(DataExtractor debug_line_data,
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uint32_t offset) {
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std::pair<LineTableIter, bool> pos =
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LineTableMap.insert(LineTableMapTy::value_type(offset, LineTable()));
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LineTable *LT = &pos.first->second;
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if (pos.second) {
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if (!LT->parse(debug_line_data, RelocMap, &offset))
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return nullptr;
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}
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return LT;
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}
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bool DWARFDebugLine::LineTable::parse(DataExtractor debug_line_data,
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const RelocAddrMap *RMap,
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uint32_t *offset_ptr) {
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const uint32_t debug_line_offset = *offset_ptr;
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clear();
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if (!Prologue.parse(debug_line_data, offset_ptr)) {
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// Restore our offset and return false to indicate failure!
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*offset_ptr = debug_line_offset;
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return false;
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}
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const uint32_t end_offset = debug_line_offset + Prologue.TotalLength +
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sizeof(Prologue.TotalLength);
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ParsingState State(this);
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while (*offset_ptr < end_offset) {
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uint8_t opcode = debug_line_data.getU8(offset_ptr);
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if (opcode == 0) {
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// Extended Opcodes always start with a zero opcode followed by
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// a uleb128 length so you can skip ones you don't know about
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uint32_t ext_offset = *offset_ptr;
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uint64_t len = debug_line_data.getULEB128(offset_ptr);
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uint32_t arg_size = len - (*offset_ptr - ext_offset);
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uint8_t sub_opcode = debug_line_data.getU8(offset_ptr);
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switch (sub_opcode) {
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case DW_LNE_end_sequence:
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// Set the end_sequence register of the state machine to true and
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// append a row to the matrix using the current values of the
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// state-machine registers. Then reset the registers to the initial
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// values specified above. Every statement program sequence must end
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// with a DW_LNE_end_sequence instruction which creates a row whose
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// address is that of the byte after the last target machine instruction
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// of the sequence.
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State.Row.EndSequence = true;
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State.appendRowToMatrix(*offset_ptr);
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State.resetRowAndSequence();
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break;
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case DW_LNE_set_address:
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// Takes a single relocatable address as an operand. The size of the
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// operand is the size appropriate to hold an address on the target
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// machine. Set the address register to the value given by the
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// relocatable address. All of the other statement program opcodes
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// that affect the address register add a delta to it. This instruction
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// stores a relocatable value into it instead.
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{
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// If this address is in our relocation map, apply the relocation.
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RelocAddrMap::const_iterator AI = RMap->find(*offset_ptr);
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if (AI != RMap->end()) {
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const std::pair<uint8_t, int64_t> &R = AI->second;
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State.Row.Address =
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debug_line_data.getAddress(offset_ptr) + R.second;
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} else
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State.Row.Address = debug_line_data.getAddress(offset_ptr);
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}
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break;
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case DW_LNE_define_file:
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// Takes 4 arguments. The first is a null terminated string containing
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// a source file name. The second is an unsigned LEB128 number
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// representing the directory index of the directory in which the file
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// was found. The third is an unsigned LEB128 number representing the
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// time of last modification of the file. The fourth is an unsigned
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// LEB128 number representing the length in bytes of the file. The time
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// and length fields may contain LEB128(0) if the information is not
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// available.
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//
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// The directory index represents an entry in the include_directories
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// section of the statement program prologue. The index is LEB128(0)
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// if the file was found in the current directory of the compilation,
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// LEB128(1) if it was found in the first directory in the
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// include_directories section, and so on. The directory index is
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// ignored for file names that represent full path names.
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//
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// The files are numbered, starting at 1, in the order in which they
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// appear; the names in the prologue come before names defined by
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// the DW_LNE_define_file instruction. These numbers are used in the
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// the file register of the state machine.
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{
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FileNameEntry fileEntry;
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fileEntry.Name = debug_line_data.getCStr(offset_ptr);
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fileEntry.DirIdx = debug_line_data.getULEB128(offset_ptr);
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fileEntry.ModTime = debug_line_data.getULEB128(offset_ptr);
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fileEntry.Length = debug_line_data.getULEB128(offset_ptr);
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Prologue.FileNames.push_back(fileEntry);
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}
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break;
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case DW_LNE_set_discriminator:
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State.Row.Discriminator = debug_line_data.getULEB128(offset_ptr);
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break;
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default:
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// Length doesn't include the zero opcode byte or the length itself, but
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// it does include the sub_opcode, so we have to adjust for that below
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(*offset_ptr) += arg_size;
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break;
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}
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} else if (opcode < Prologue.OpcodeBase) {
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switch (opcode) {
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// Standard Opcodes
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case DW_LNS_copy:
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// Takes no arguments. Append a row to the matrix using the
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// current values of the state-machine registers. Then set
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// the basic_block register to false.
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State.appendRowToMatrix(*offset_ptr);
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break;
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case DW_LNS_advance_pc:
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// Takes a single unsigned LEB128 operand, multiplies it by the
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// min_inst_length field of the prologue, and adds the
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// result to the address register of the state machine.
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State.Row.Address +=
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debug_line_data.getULEB128(offset_ptr) * Prologue.MinInstLength;
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break;
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case DW_LNS_advance_line:
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// Takes a single signed LEB128 operand and adds that value to
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// the line register of the state machine.
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State.Row.Line += debug_line_data.getSLEB128(offset_ptr);
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break;
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case DW_LNS_set_file:
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// Takes a single unsigned LEB128 operand and stores it in the file
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// register of the state machine.
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State.Row.File = debug_line_data.getULEB128(offset_ptr);
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break;
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case DW_LNS_set_column:
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// Takes a single unsigned LEB128 operand and stores it in the
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// column register of the state machine.
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State.Row.Column = debug_line_data.getULEB128(offset_ptr);
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break;
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case DW_LNS_negate_stmt:
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// Takes no arguments. Set the is_stmt register of the state
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// machine to the logical negation of its current value.
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State.Row.IsStmt = !State.Row.IsStmt;
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break;
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case DW_LNS_set_basic_block:
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// Takes no arguments. Set the basic_block register of the
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// state machine to true
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State.Row.BasicBlock = true;
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break;
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case DW_LNS_const_add_pc:
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// Takes no arguments. Add to the address register of the state
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// machine the address increment value corresponding to special
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// opcode 255. The motivation for DW_LNS_const_add_pc is this:
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// when the statement program needs to advance the address by a
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// small amount, it can use a single special opcode, which occupies
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// a single byte. When it needs to advance the address by up to
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// twice the range of the last special opcode, it can use
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// DW_LNS_const_add_pc followed by a special opcode, for a total
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// of two bytes. Only if it needs to advance the address by more
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// than twice that range will it need to use both DW_LNS_advance_pc
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// and a special opcode, requiring three or more bytes.
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{
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uint8_t adjust_opcode = 255 - Prologue.OpcodeBase;
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uint64_t addr_offset =
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(adjust_opcode / Prologue.LineRange) * Prologue.MinInstLength;
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State.Row.Address += addr_offset;
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}
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break;
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case DW_LNS_fixed_advance_pc:
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// Takes a single uhalf operand. Add to the address register of
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// the state machine the value of the (unencoded) operand. This
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// is the only extended opcode that takes an argument that is not
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// a variable length number. The motivation for DW_LNS_fixed_advance_pc
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// is this: existing assemblers cannot emit DW_LNS_advance_pc or
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// special opcodes because they cannot encode LEB128 numbers or
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// judge when the computation of a special opcode overflows and
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// requires the use of DW_LNS_advance_pc. Such assemblers, however,
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// can use DW_LNS_fixed_advance_pc instead, sacrificing compression.
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State.Row.Address += debug_line_data.getU16(offset_ptr);
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break;
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case DW_LNS_set_prologue_end:
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// Takes no arguments. Set the prologue_end register of the
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// state machine to true
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State.Row.PrologueEnd = true;
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break;
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case DW_LNS_set_epilogue_begin:
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// Takes no arguments. Set the basic_block register of the
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// state machine to true
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State.Row.EpilogueBegin = true;
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break;
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case DW_LNS_set_isa:
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// Takes a single unsigned LEB128 operand and stores it in the
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// column register of the state machine.
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State.Row.Isa = debug_line_data.getULEB128(offset_ptr);
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break;
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default:
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// Handle any unknown standard opcodes here. We know the lengths
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// of such opcodes because they are specified in the prologue
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// as a multiple of LEB128 operands for each opcode.
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{
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assert(opcode - 1U < Prologue.StandardOpcodeLengths.size());
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uint8_t opcode_length = Prologue.StandardOpcodeLengths[opcode - 1];
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for (uint8_t i = 0; i < opcode_length; ++i)
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debug_line_data.getULEB128(offset_ptr);
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}
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break;
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}
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} else {
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// Special Opcodes
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// A special opcode value is chosen based on the amount that needs
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// to be added to the line and address registers. The maximum line
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// increment for a special opcode is the value of the line_base
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// field in the header, plus the value of the line_range field,
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// minus 1 (line base + line range - 1). If the desired line
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// increment is greater than the maximum line increment, a standard
|
|
// opcode must be used instead of a special opcode. The "address
|
|
// advance" is calculated by dividing the desired address increment
|
|
// by the minimum_instruction_length field from the header. The
|
|
// special opcode is then calculated using the following formula:
|
|
//
|
|
// opcode = (desired line increment - line_base) +
|
|
// (line_range * address advance) + opcode_base
|
|
//
|
|
// If the resulting opcode is greater than 255, a standard opcode
|
|
// must be used instead.
|
|
//
|
|
// To decode a special opcode, subtract the opcode_base from the
|
|
// opcode itself to give the adjusted opcode. The amount to
|
|
// increment the address register is the result of the adjusted
|
|
// opcode divided by the line_range multiplied by the
|
|
// minimum_instruction_length field from the header. That is:
|
|
//
|
|
// address increment = (adjusted opcode / line_range) *
|
|
// minimum_instruction_length
|
|
//
|
|
// The amount to increment the line register is the line_base plus
|
|
// the result of the adjusted opcode modulo the line_range. That is:
|
|
//
|
|
// line increment = line_base + (adjusted opcode % line_range)
|
|
|
|
uint8_t adjust_opcode = opcode - Prologue.OpcodeBase;
|
|
uint64_t addr_offset =
|
|
(adjust_opcode / Prologue.LineRange) * Prologue.MinInstLength;
|
|
int32_t line_offset =
|
|
Prologue.LineBase + (adjust_opcode % Prologue.LineRange);
|
|
State.Row.Line += line_offset;
|
|
State.Row.Address += addr_offset;
|
|
State.appendRowToMatrix(*offset_ptr);
|
|
}
|
|
}
|
|
|
|
if (!State.Sequence.Empty) {
|
|
fprintf(stderr, "warning: last sequence in debug line table is not"
|
|
"terminated!\n");
|
|
}
|
|
|
|
// Sort all sequences so that address lookup will work faster.
|
|
if (!Sequences.empty()) {
|
|
std::sort(Sequences.begin(), Sequences.end(), Sequence::orderByLowPC);
|
|
// Note: actually, instruction address ranges of sequences should not
|
|
// overlap (in shared objects and executables). If they do, the address
|
|
// lookup would still work, though, but result would be ambiguous.
|
|
// We don't report warning in this case. For example,
|
|
// sometimes .so compiled from multiple object files contains a few
|
|
// rudimentary sequences for address ranges [0x0, 0xsomething).
|
|
}
|
|
|
|
return end_offset;
|
|
}
|
|
|
|
uint32_t DWARFDebugLine::LineTable::lookupAddress(uint64_t address) const {
|
|
uint32_t unknown_index = UINT32_MAX;
|
|
if (Sequences.empty())
|
|
return unknown_index;
|
|
// First, find an instruction sequence containing the given address.
|
|
DWARFDebugLine::Sequence sequence;
|
|
sequence.LowPC = address;
|
|
SequenceIter first_seq = Sequences.begin();
|
|
SequenceIter last_seq = Sequences.end();
|
|
SequenceIter seq_pos = std::lower_bound(first_seq, last_seq, sequence,
|
|
DWARFDebugLine::Sequence::orderByLowPC);
|
|
DWARFDebugLine::Sequence found_seq;
|
|
if (seq_pos == last_seq) {
|
|
found_seq = Sequences.back();
|
|
} else if (seq_pos->LowPC == address) {
|
|
found_seq = *seq_pos;
|
|
} else {
|
|
if (seq_pos == first_seq)
|
|
return unknown_index;
|
|
found_seq = *(seq_pos - 1);
|
|
}
|
|
if (!found_seq.containsPC(address))
|
|
return unknown_index;
|
|
// Search for instruction address in the rows describing the sequence.
|
|
// Rows are stored in a vector, so we may use arithmetical operations with
|
|
// iterators.
|
|
DWARFDebugLine::Row row;
|
|
row.Address = address;
|
|
RowIter first_row = Rows.begin() + found_seq.FirstRowIndex;
|
|
RowIter last_row = Rows.begin() + found_seq.LastRowIndex;
|
|
RowIter row_pos = std::lower_bound(first_row, last_row, row,
|
|
DWARFDebugLine::Row::orderByAddress);
|
|
if (row_pos == last_row) {
|
|
return found_seq.LastRowIndex - 1;
|
|
}
|
|
uint32_t index = found_seq.FirstRowIndex + (row_pos - first_row);
|
|
if (row_pos->Address > address) {
|
|
if (row_pos == first_row)
|
|
return unknown_index;
|
|
else
|
|
index--;
|
|
}
|
|
return index;
|
|
}
|
|
|
|
bool DWARFDebugLine::LineTable::lookupAddressRange(
|
|
uint64_t address, uint64_t size, std::vector<uint32_t> &result) const {
|
|
if (Sequences.empty())
|
|
return false;
|
|
uint64_t end_addr = address + size;
|
|
// First, find an instruction sequence containing the given address.
|
|
DWARFDebugLine::Sequence sequence;
|
|
sequence.LowPC = address;
|
|
SequenceIter first_seq = Sequences.begin();
|
|
SequenceIter last_seq = Sequences.end();
|
|
SequenceIter seq_pos = std::lower_bound(first_seq, last_seq, sequence,
|
|
DWARFDebugLine::Sequence::orderByLowPC);
|
|
if (seq_pos == last_seq || seq_pos->LowPC != address) {
|
|
if (seq_pos == first_seq)
|
|
return false;
|
|
seq_pos--;
|
|
}
|
|
if (!seq_pos->containsPC(address))
|
|
return false;
|
|
|
|
SequenceIter start_pos = seq_pos;
|
|
|
|
// Add the rows from the first sequence to the vector, starting with the
|
|
// index we just calculated
|
|
|
|
while (seq_pos != last_seq && seq_pos->LowPC < end_addr) {
|
|
DWARFDebugLine::Sequence cur_seq = *seq_pos;
|
|
uint32_t first_row_index;
|
|
uint32_t last_row_index;
|
|
if (seq_pos == start_pos) {
|
|
// For the first sequence, we need to find which row in the sequence is the
|
|
// first in our range. Rows are stored in a vector, so we may use
|
|
// arithmetical operations with iterators.
|
|
DWARFDebugLine::Row row;
|
|
row.Address = address;
|
|
RowIter first_row = Rows.begin() + cur_seq.FirstRowIndex;
|
|
RowIter last_row = Rows.begin() + cur_seq.LastRowIndex;
|
|
RowIter row_pos = std::upper_bound(first_row, last_row, row,
|
|
DWARFDebugLine::Row::orderByAddress);
|
|
// The 'row_pos' iterator references the first row that is greater than
|
|
// our start address. Unless that's the first row, we want to start at
|
|
// the row before that.
|
|
first_row_index = cur_seq.FirstRowIndex + (row_pos - first_row);
|
|
if (row_pos != first_row)
|
|
--first_row_index;
|
|
} else
|
|
first_row_index = cur_seq.FirstRowIndex;
|
|
|
|
// For the last sequence in our range, we need to figure out the last row in
|
|
// range. For all other sequences we can go to the end of the sequence.
|
|
if (cur_seq.HighPC > end_addr) {
|
|
DWARFDebugLine::Row row;
|
|
row.Address = end_addr;
|
|
RowIter first_row = Rows.begin() + cur_seq.FirstRowIndex;
|
|
RowIter last_row = Rows.begin() + cur_seq.LastRowIndex;
|
|
RowIter row_pos = std::upper_bound(first_row, last_row, row,
|
|
DWARFDebugLine::Row::orderByAddress);
|
|
// The 'row_pos' iterator references the first row that is greater than
|
|
// our end address. The row before that is the last row we want.
|
|
last_row_index = cur_seq.FirstRowIndex + (row_pos - first_row) - 1;
|
|
} else
|
|
// Contrary to what you might expect, DWARFDebugLine::SequenceLastRowIndex
|
|
// isn't a valid index within the current sequence. It's that plus one.
|
|
last_row_index = cur_seq.LastRowIndex - 1;
|
|
|
|
for (uint32_t i = first_row_index; i <= last_row_index; ++i) {
|
|
result.push_back(i);
|
|
}
|
|
|
|
++seq_pos;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
bool
|
|
DWARFDebugLine::LineTable::getFileNameByIndex(uint64_t FileIndex,
|
|
FileLineInfoKind Kind,
|
|
std::string &Result) const {
|
|
if (FileIndex == 0 || FileIndex > Prologue.FileNames.size() ||
|
|
Kind == FileLineInfoKind::None)
|
|
return false;
|
|
const FileNameEntry &Entry = Prologue.FileNames[FileIndex - 1];
|
|
const char *FileName = Entry.Name;
|
|
if (Kind != FileLineInfoKind::AbsoluteFilePath ||
|
|
sys::path::is_absolute(FileName)) {
|
|
Result = FileName;
|
|
return true;
|
|
}
|
|
SmallString<16> FilePath;
|
|
uint64_t IncludeDirIndex = Entry.DirIdx;
|
|
// Be defensive about the contents of Entry.
|
|
if (IncludeDirIndex > 0 &&
|
|
IncludeDirIndex <= Prologue.IncludeDirectories.size()) {
|
|
const char *IncludeDir = Prologue.IncludeDirectories[IncludeDirIndex - 1];
|
|
sys::path::append(FilePath, IncludeDir);
|
|
}
|
|
sys::path::append(FilePath, FileName);
|
|
Result = FilePath.str();
|
|
return true;
|
|
}
|