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//===-- DWARFContext.cpp --------------------------------------------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "DWARFContext.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/Support/Dwarf.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/Path.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
using namespace llvm;
using namespace dwarf;
void DWARFContext::dump(raw_ostream &OS) {
OS << ".debug_abbrev contents:\n";
getDebugAbbrev()->dump(OS);
OS << "\n.debug_info contents:\n";
for (unsigned i = 0, e = getNumCompileUnits(); i != e; ++i)
getCompileUnitAtIndex(i)->dump(OS);
OS << "\n.debug_aranges contents:\n";
DataExtractor arangesData(getARangeSection(), isLittleEndian(), 0);
uint32_t offset = 0;
DWARFDebugArangeSet set;
while (set.extract(arangesData, &offset))
set.dump(OS);
uint8_t savedAddressByteSize = 0;
OS << "\n.debug_lines contents:\n";
for (unsigned i = 0, e = getNumCompileUnits(); i != e; ++i) {
DWARFCompileUnit *cu = getCompileUnitAtIndex(i);
savedAddressByteSize = cu->getAddressByteSize();
unsigned stmtOffset =
cu->getCompileUnitDIE()->getAttributeValueAsUnsigned(cu, DW_AT_stmt_list,
-1U);
if (stmtOffset != -1U) {
DataExtractor lineData(getLineSection(), isLittleEndian(),
savedAddressByteSize);
DWARFDebugLine::DumpingState state(OS);
DWARFDebugLine::parseStatementTable(lineData, &stmtOffset, state);
}
}
OS << "\n.debug_str contents:\n";
DataExtractor strData(getStringSection(), isLittleEndian(), 0);
offset = 0;
uint32_t lastOffset = 0;
while (const char *s = strData.getCStr(&offset)) {
OS << format("0x%8.8x: \"%s\"\n", lastOffset, s);
lastOffset = offset;
}
OS << "\n.debug_ranges contents:\n";
// In fact, different compile units may have different address byte
// sizes, but for simplicity we just use the address byte size of the last
// compile unit (there is no easy and fast way to associate address range
// list and the compile unit it describes).
DataExtractor rangesData(getRangeSection(), isLittleEndian(),
savedAddressByteSize);
offset = 0;
DWARFDebugRangeList rangeList;
while (rangeList.extract(rangesData, &offset))
rangeList.dump(OS);
}
const DWARFDebugAbbrev *DWARFContext::getDebugAbbrev() {
if (Abbrev)
return Abbrev.get();
DataExtractor abbrData(getAbbrevSection(), isLittleEndian(), 0);
Abbrev.reset(new DWARFDebugAbbrev());
Abbrev->parse(abbrData);
return Abbrev.get();
}
const DWARFDebugAranges *DWARFContext::getDebugAranges() {
if (Aranges)
return Aranges.get();
DataExtractor arangesData(getARangeSection(), isLittleEndian(), 0);
Aranges.reset(new DWARFDebugAranges());
Aranges->extract(arangesData);
if (Aranges->isEmpty()) // No aranges in file, generate them from the DIEs.
Aranges->generate(this);
return Aranges.get();
}
const DWARFDebugLine::LineTable *
DWARFContext::getLineTableForCompileUnit(DWARFCompileUnit *cu) {
if (!Line)
Line.reset(new DWARFDebugLine());
unsigned stmtOffset =
cu->getCompileUnitDIE()->getAttributeValueAsUnsigned(cu, DW_AT_stmt_list,
-1U);
if (stmtOffset == -1U)
return 0; // No line table for this compile unit.
// See if the line table is cached.
if (const DWARFDebugLine::LineTable *lt = Line->getLineTable(stmtOffset))
return lt;
// We have to parse it first.
DataExtractor lineData(getLineSection(), isLittleEndian(),
cu->getAddressByteSize());
return Line->getOrParseLineTable(lineData, stmtOffset);
}
void DWARFContext::parseCompileUnits() {
uint32_t offset = 0;
const DataExtractor &debug_info_data = DataExtractor(getInfoSection(),
isLittleEndian(), 0);
while (debug_info_data.isValidOffset(offset)) {
CUs.push_back(DWARFCompileUnit(*this));
if (!CUs.back().extract(debug_info_data, &offset)) {
CUs.pop_back();
break;
}
offset = CUs.back().getNextCompileUnitOffset();
}
}
namespace {
struct OffsetComparator {
bool operator()(const DWARFCompileUnit &LHS,
const DWARFCompileUnit &RHS) const {
return LHS.getOffset() < RHS.getOffset();
}
bool operator()(const DWARFCompileUnit &LHS, uint32_t RHS) const {
return LHS.getOffset() < RHS;
}
bool operator()(uint32_t LHS, const DWARFCompileUnit &RHS) const {
return LHS < RHS.getOffset();
}
};
}
DWARFCompileUnit *DWARFContext::getCompileUnitForOffset(uint32_t offset) {
if (CUs.empty())
parseCompileUnits();
DWARFCompileUnit *i = std::lower_bound(CUs.begin(), CUs.end(), offset,
OffsetComparator());
if (i != CUs.end())
return &*i;
return 0;
}
DILineInfo DWARFContext::getLineInfoForAddress(uint64_t address,
DILineInfoSpecifier specifier) {
// First, get the offset of the compile unit.
uint32_t cuOffset = getDebugAranges()->findAddress(address);
// Retrieve the compile unit.
DWARFCompileUnit *cu = getCompileUnitForOffset(cuOffset);
if (!cu)
return DILineInfo();
SmallString<16> fileName("<invalid>");
SmallString<16> functionName("<invalid>");
uint32_t line = 0;
uint32_t column = 0;
if (specifier.needs(DILineInfoSpecifier::FunctionName)) {
const DWARFDebugInfoEntryMinimal *function_die =
cu->getFunctionDIEForAddress(address);
if (function_die) {
if (const char *name = function_die->getSubprogramName(cu))
functionName = name;
}
}
if (specifier.needs(DILineInfoSpecifier::FileLineInfo)) {
// Get the line table for this compile unit.
const DWARFDebugLine::LineTable *lineTable = getLineTableForCompileUnit(cu);
if (lineTable) {
// Get the index of the row we're looking for in the line table.
uint32_t rowIndex = lineTable->lookupAddress(address);
if (rowIndex != -1U) {
const DWARFDebugLine::Row &row = lineTable->Rows[rowIndex];
// Take file/line info from the line table.
const DWARFDebugLine::FileNameEntry &fileNameEntry =
lineTable->Prologue.FileNames[row.File - 1];
fileName = fileNameEntry.Name;
if (specifier.needs(DILineInfoSpecifier::AbsoluteFilePath) &&
sys::path::is_relative(fileName.str())) {
// Append include directory of file (if it is present in line table)
// and compilation directory of compile unit to make path absolute.
const char *includeDir = 0;
if (uint64_t includeDirIndex = fileNameEntry.DirIdx) {
includeDir = lineTable->Prologue
.IncludeDirectories[includeDirIndex - 1];
}
SmallString<16> absFileName;
if (includeDir == 0 || sys::path::is_relative(includeDir)) {
if (const char *compilationDir = cu->getCompilationDir())
sys::path::append(absFileName, compilationDir);
}
if (includeDir) {
sys::path::append(absFileName, includeDir);
}
sys::path::append(absFileName, fileName.str());
fileName = absFileName;
}
line = row.Line;
column = row.Column;
}
}
}
return DILineInfo(fileName, functionName, line, column);
}
void DWARFContextInMemory::anchor() { }
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