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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/Support/Dwarf.h"
#include "llvm/Support/Format.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);
OS << "\n.debug_lines contents:\n";
for (unsigned i = 0, e = getNumCompileUnits(); i != e; ++i) {
DWARFCompileUnit *cu = getCompileUnitAtIndex(i);
unsigned stmtOffset =
cu->getCompileUnitDIE()->getAttributeValueAsUnsigned(cu, DW_AT_stmt_list,
-1U);
if (stmtOffset != -1U) {
DataExtractor lineData(getLineSection(), isLittleEndian(),
cu->getAddressByteSize());
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;
}
}
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) {
// First, get the index for the arange.
uint32_t arangeIndex = getDebugAranges()->findAddress(address);
// From there, get the offset of the compile unit.
uint32_t cuOffset = getDebugAranges()->offsetAtIndex(arangeIndex);
// Retrieve the compile unit.
DWARFCompileUnit *cu = getCompileUnitForOffset(cuOffset);
if (!cu)
return DILineInfo("<invalid>", 0, 0);
// Get the line table for this compile unit.
const DWARFDebugLine::LineTable *lineTable = getLineTableForCompileUnit(cu);
if (!lineTable)
return DILineInfo("<invalid>", 0, 0);
// Get the index of the row we're looking for in the line table.
uint64_t hiPC =
cu->getCompileUnitDIE()->getAttributeValueAsUnsigned(cu, DW_AT_high_pc,
-1ULL);
uint32_t rowIndex = lineTable->lookupAddress(address, hiPC);
if (rowIndex == -1U)
return DILineInfo("<invalid>", 0, 0);
// From here, contruct the DILineInfo.
const DWARFDebugLine::Row &row = lineTable->Rows[rowIndex];
const std::string &fileName = lineTable->Prologue.FileNames[row.File-1].Name;
return DILineInfo(fileName.c_str(), row.Line, row.Column);
}
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