mirror of
https://github.com/c64scene-ar/llvm-6502.git
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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139859 91177308-0d34-0410-b5e6-96231b3b80d8
168 lines
5.5 KiB
C++
168 lines
5.5 KiB
C++
//===-- DWARFContext.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 "DWARFContext.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/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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void DWARFContext::dump(raw_ostream &OS) {
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OS << ".debug_abbrev contents:\n";
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getDebugAbbrev()->dump(OS);
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OS << "\n.debug_info contents:\n";
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for (unsigned i = 0, e = getNumCompileUnits(); i != e; ++i)
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getCompileUnitAtIndex(i)->dump(OS);
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OS << "\n.debug_aranges contents:\n";
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DataExtractor arangesData(getARangeSection(), isLittleEndian(), 0);
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uint32_t offset = 0;
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DWARFDebugArangeSet set;
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while (set.extract(arangesData, &offset))
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set.dump(OS);
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OS << "\n.debug_lines contents:\n";
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for (unsigned i = 0, e = getNumCompileUnits(); i != e; ++i) {
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DWARFCompileUnit *cu = getCompileUnitAtIndex(i);
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unsigned stmtOffset =
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cu->getCompileUnitDIE()->getAttributeValueAsUnsigned(cu, DW_AT_stmt_list,
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-1U);
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if (stmtOffset != -1U) {
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DataExtractor lineData(getLineSection(), isLittleEndian(),
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cu->getAddressByteSize());
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DWARFDebugLine::DumpingState state(OS);
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DWARFDebugLine::parseStatementTable(lineData, &stmtOffset, state);
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}
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}
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OS << "\n.debug_str contents:\n";
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DataExtractor strData(getStringSection(), isLittleEndian(), 0);
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offset = 0;
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uint32_t lastOffset = 0;
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while (const char *s = strData.getCStr(&offset)) {
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OS << format("0x%8.8x: \"%s\"\n", lastOffset, s);
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lastOffset = offset;
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}
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}
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const DWARFDebugAbbrev *DWARFContext::getDebugAbbrev() {
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if (Abbrev)
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return Abbrev.get();
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DataExtractor abbrData(getAbbrevSection(), isLittleEndian(), 0);
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Abbrev.reset(new DWARFDebugAbbrev());
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Abbrev->parse(abbrData);
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return Abbrev.get();
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}
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const DWARFDebugAranges *DWARFContext::getDebugAranges() {
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if (Aranges)
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return Aranges.get();
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DataExtractor arangesData(getARangeSection(), isLittleEndian(), 0);
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Aranges.reset(new DWARFDebugAranges());
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Aranges->extract(arangesData);
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if (Aranges->isEmpty()) // No aranges in file, generate them from the DIEs.
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Aranges->generate(this);
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return Aranges.get();
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}
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const DWARFDebugLine::LineTable *
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DWARFContext::getLineTableForCompileUnit(DWARFCompileUnit *cu) {
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if (!Line)
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Line.reset(new DWARFDebugLine());
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unsigned stmtOffset =
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cu->getCompileUnitDIE()->getAttributeValueAsUnsigned(cu, DW_AT_stmt_list,
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-1U);
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if (stmtOffset == -1U)
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return 0; // No line table for this compile unit.
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// See if the line table is cached.
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if (const DWARFDebugLine::LineTable *lt = Line->getLineTable(stmtOffset))
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return lt;
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// We have to parse it first.
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DataExtractor lineData(getLineSection(), isLittleEndian(),
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cu->getAddressByteSize());
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return Line->getOrParseLineTable(lineData, stmtOffset);
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}
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void DWARFContext::parseCompileUnits() {
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uint32_t offset = 0;
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const DataExtractor &debug_info_data = DataExtractor(getInfoSection(),
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isLittleEndian(), 0);
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while (debug_info_data.isValidOffset(offset)) {
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CUs.push_back(DWARFCompileUnit(*this));
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if (!CUs.back().extract(debug_info_data, &offset)) {
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CUs.pop_back();
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break;
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}
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offset = CUs.back().getNextCompileUnitOffset();
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}
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}
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namespace {
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struct OffsetComparator {
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bool operator()(const DWARFCompileUnit &LHS,
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const DWARFCompileUnit &RHS) const {
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return LHS.getOffset() < RHS.getOffset();
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}
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bool operator()(const DWARFCompileUnit &LHS, uint32_t RHS) const {
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return LHS.getOffset() < RHS;
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}
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bool operator()(uint32_t LHS, const DWARFCompileUnit &RHS) const {
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return LHS < RHS.getOffset();
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}
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};
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}
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DWARFCompileUnit *DWARFContext::getCompileUnitForOffset(uint32_t offset) {
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if (CUs.empty())
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parseCompileUnits();
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DWARFCompileUnit *i = std::lower_bound(CUs.begin(), CUs.end(), offset,
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OffsetComparator());
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if (i != CUs.end())
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return &*i;
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return 0;
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}
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DILineInfo DWARFContext::getLineInfoForAddress(uint64_t address) {
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// First, get the offset of the compile unit.
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uint32_t cuOffset = getDebugAranges()->findAddress(address);
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// Retrieve the compile unit.
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DWARFCompileUnit *cu = getCompileUnitForOffset(cuOffset);
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if (!cu)
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return DILineInfo("<invalid>", 0, 0);
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// Get the line table for this compile unit.
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const DWARFDebugLine::LineTable *lineTable = getLineTableForCompileUnit(cu);
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if (!lineTable)
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return DILineInfo("<invalid>", 0, 0);
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// Get the index of the row we're looking for in the line table.
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uint64_t hiPC =
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cu->getCompileUnitDIE()->getAttributeValueAsUnsigned(cu, DW_AT_high_pc,
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-1ULL);
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uint32_t rowIndex = lineTable->lookupAddress(address, hiPC);
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if (rowIndex == -1U)
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return DILineInfo("<invalid>", 0, 0);
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// From here, contruct the DILineInfo.
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const DWARFDebugLine::Row &row = lineTable->Rows[rowIndex];
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const std::string &fileName = lineTable->Prologue.FileNames[row.File-1].Name;
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return DILineInfo(fileName.c_str(), row.Line, row.Column);
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}
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