mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-07-21 02:29:22 +00:00
dd8e9f395e
proposal. This leaves the strings in the skeleton die as strp, but in all dwo files they're accessed now via DW_FORM_GNU_str_index. Add support for dumping these sections and modify the fission-cu.ll testcase to have the correct strings and form. Fix a small bug in the fixed form sizes routine that involved out of array accesses for the table and add a FIXME in the extractFast routine to fix this up. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171779 91177308-0d34-0410-b5e6-96231b3b80d8
449 lines
16 KiB
C++
449 lines
16 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/ADT/SmallString.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 DWARFDebugLine::LineTable DWARFLineTable;
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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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uint8_t savedAddressByteSize = 0;
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OS << "\n.debug_line 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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savedAddressByteSize = cu->getAddressByteSize();
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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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savedAddressByteSize);
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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 strOffset = 0;
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while (const char *s = strData.getCStr(&offset)) {
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OS << format("0x%8.8x: \"%s\"\n", strOffset, s);
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strOffset = offset;
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}
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OS << "\n.debug_ranges contents:\n";
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// In fact, different compile units may have different address byte
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// sizes, but for simplicity we just use the address byte size of the last
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// compile unit (there is no easy and fast way to associate address range
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// list and the compile unit it describes).
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DataExtractor rangesData(getRangeSection(), isLittleEndian(),
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savedAddressByteSize);
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offset = 0;
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DWARFDebugRangeList rangeList;
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while (rangeList.extract(rangesData, &offset))
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rangeList.dump(OS);
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OS << "\n.debug_abbrev.dwo contents:\n";
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getDebugAbbrevDWO()->dump(OS);
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OS << "\n.debug_info.dwo contents:\n";
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for (unsigned i = 0, e = getNumDWOCompileUnits(); i != e; ++i)
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getDWOCompileUnitAtIndex(i)->dump(OS);
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OS << "\n.debug_str.dwo contents:\n";
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DataExtractor strDWOData(getStringDWOSection(), isLittleEndian(), 0);
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offset = 0;
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uint32_t strDWOOffset = 0;
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while (const char *s = strDWOData.getCStr(&offset)) {
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OS << format("0x%8.8x: \"%s\"\n", strDWOOffset, s);
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strDWOOffset = 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 DWARFDebugAbbrev *DWARFContext::getDebugAbbrevDWO() {
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if (AbbrevDWO)
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return AbbrevDWO.get();
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DataExtractor abbrData(getAbbrevDWOSection(), isLittleEndian(), 0);
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AbbrevDWO.reset(new DWARFDebugAbbrev());
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AbbrevDWO->parse(abbrData);
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return AbbrevDWO.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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// Generate aranges from DIEs: even if .debug_aranges section is present,
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// it may describe only a small subset of compilation units, so we need to
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// manually build aranges for the rest of them.
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Aranges->generate(this);
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return Aranges.get();
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}
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const DWARFLineTable *
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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 DWARFLineTable *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 &DIData = DataExtractor(getInfoSection(),
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isLittleEndian(), 0);
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while (DIData.isValidOffset(offset)) {
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CUs.push_back(DWARFCompileUnit(getDebugAbbrev(), getInfoSection(),
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getAbbrevSection(), getRangeSection(),
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getStringSection(), "",
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&infoRelocMap(),
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isLittleEndian()));
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if (!CUs.back().extract(DIData, &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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void DWARFContext::parseDWOCompileUnits() {
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uint32_t offset = 0;
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const DataExtractor &DIData = DataExtractor(getInfoDWOSection(),
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isLittleEndian(), 0);
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while (DIData.isValidOffset(offset)) {
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DWOCUs.push_back(DWARFCompileUnit(getDebugAbbrevDWO(), getInfoDWOSection(),
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getAbbrevDWOSection(),
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getRangeDWOSection(),
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getStringDWOSection(),
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getStringOffsetDWOSection(),
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&infoDWORelocMap(),
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isLittleEndian()));
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if (!DWOCUs.back().extract(DIData, &offset)) {
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DWOCUs.pop_back();
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break;
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}
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offset = DWOCUs.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 *CU = std::lower_bound(CUs.begin(), CUs.end(), Offset,
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OffsetComparator());
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if (CU != CUs.end())
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return &*CU;
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return 0;
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}
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DWARFCompileUnit *DWARFContext::getCompileUnitForAddress(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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return getCompileUnitForOffset(CUOffset);
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}
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static bool getFileNameForCompileUnit(DWARFCompileUnit *CU,
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const DWARFLineTable *LineTable,
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uint64_t FileIndex,
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bool NeedsAbsoluteFilePath,
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std::string &FileName) {
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if (CU == 0 ||
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LineTable == 0 ||
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!LineTable->getFileNameByIndex(FileIndex, NeedsAbsoluteFilePath,
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FileName))
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return false;
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if (NeedsAbsoluteFilePath && sys::path::is_relative(FileName)) {
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// We may still need to append compilation directory of compile unit.
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SmallString<16> AbsolutePath;
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if (const char *CompilationDir = CU->getCompilationDir()) {
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sys::path::append(AbsolutePath, CompilationDir);
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}
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sys::path::append(AbsolutePath, FileName);
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FileName = AbsolutePath.str();
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}
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return true;
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}
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static bool getFileLineInfoForCompileUnit(DWARFCompileUnit *CU,
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const DWARFLineTable *LineTable,
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uint64_t Address,
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bool NeedsAbsoluteFilePath,
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std::string &FileName,
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uint32_t &Line, uint32_t &Column) {
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if (CU == 0 || LineTable == 0)
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return false;
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// Get the index of row we're looking for in the line table.
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uint32_t RowIndex = LineTable->lookupAddress(Address);
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if (RowIndex == -1U)
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return false;
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// Take file number and line/column from the row.
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const DWARFDebugLine::Row &Row = LineTable->Rows[RowIndex];
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if (!getFileNameForCompileUnit(CU, LineTable, Row.File,
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NeedsAbsoluteFilePath, FileName))
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return false;
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Line = Row.Line;
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Column = Row.Column;
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return true;
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}
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DILineInfo DWARFContext::getLineInfoForAddress(uint64_t Address,
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DILineInfoSpecifier Specifier) {
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DWARFCompileUnit *CU = getCompileUnitForAddress(Address);
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if (!CU)
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return DILineInfo();
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std::string FileName = "<invalid>";
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std::string FunctionName = "<invalid>";
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uint32_t Line = 0;
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uint32_t Column = 0;
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if (Specifier.needs(DILineInfoSpecifier::FunctionName)) {
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// The address may correspond to instruction in some inlined function,
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// so we have to build the chain of inlined functions and take the
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// name of the topmost function in it.
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const DWARFDebugInfoEntryMinimal::InlinedChain &InlinedChain =
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CU->getInlinedChainForAddress(Address);
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if (InlinedChain.size() > 0) {
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const DWARFDebugInfoEntryMinimal &TopFunctionDIE = InlinedChain[0];
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if (const char *Name = TopFunctionDIE.getSubroutineName(CU))
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FunctionName = Name;
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}
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}
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if (Specifier.needs(DILineInfoSpecifier::FileLineInfo)) {
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const DWARFLineTable *LineTable = getLineTableForCompileUnit(CU);
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const bool NeedsAbsoluteFilePath =
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Specifier.needs(DILineInfoSpecifier::AbsoluteFilePath);
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getFileLineInfoForCompileUnit(CU, LineTable, Address,
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NeedsAbsoluteFilePath,
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FileName, Line, Column);
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}
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return DILineInfo(StringRef(FileName), StringRef(FunctionName),
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Line, Column);
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}
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DIInliningInfo DWARFContext::getInliningInfoForAddress(uint64_t Address,
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DILineInfoSpecifier Specifier) {
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DWARFCompileUnit *CU = getCompileUnitForAddress(Address);
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if (!CU)
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return DIInliningInfo();
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const DWARFDebugInfoEntryMinimal::InlinedChain &InlinedChain =
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CU->getInlinedChainForAddress(Address);
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if (InlinedChain.size() == 0)
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return DIInliningInfo();
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DIInliningInfo InliningInfo;
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uint32_t CallFile = 0, CallLine = 0, CallColumn = 0;
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const DWARFLineTable *LineTable = 0;
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for (uint32_t i = 0, n = InlinedChain.size(); i != n; i++) {
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const DWARFDebugInfoEntryMinimal &FunctionDIE = InlinedChain[i];
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std::string FileName = "<invalid>";
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std::string FunctionName = "<invalid>";
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uint32_t Line = 0;
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uint32_t Column = 0;
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// Get function name if necessary.
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if (Specifier.needs(DILineInfoSpecifier::FunctionName)) {
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if (const char *Name = FunctionDIE.getSubroutineName(CU))
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FunctionName = Name;
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}
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if (Specifier.needs(DILineInfoSpecifier::FileLineInfo)) {
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const bool NeedsAbsoluteFilePath =
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Specifier.needs(DILineInfoSpecifier::AbsoluteFilePath);
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if (i == 0) {
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// For the topmost frame, initialize the line table of this
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// compile unit and fetch file/line info from it.
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LineTable = getLineTableForCompileUnit(CU);
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// For the topmost routine, get file/line info from line table.
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getFileLineInfoForCompileUnit(CU, LineTable, Address,
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NeedsAbsoluteFilePath,
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FileName, Line, Column);
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} else {
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// Otherwise, use call file, call line and call column from
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// previous DIE in inlined chain.
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getFileNameForCompileUnit(CU, LineTable, CallFile,
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NeedsAbsoluteFilePath, FileName);
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Line = CallLine;
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Column = CallColumn;
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}
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// Get call file/line/column of a current DIE.
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if (i + 1 < n) {
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FunctionDIE.getCallerFrame(CU, CallFile, CallLine, CallColumn);
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}
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}
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DILineInfo Frame(StringRef(FileName), StringRef(FunctionName),
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Line, Column);
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InliningInfo.addFrame(Frame);
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}
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return InliningInfo;
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}
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DWARFContextInMemory::DWARFContextInMemory(object::ObjectFile *Obj) :
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IsLittleEndian(true /* FIXME */) {
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error_code ec;
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for (object::section_iterator i = Obj->begin_sections(),
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e = Obj->end_sections();
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i != e; i.increment(ec)) {
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StringRef name;
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i->getName(name);
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StringRef data;
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i->getContents(data);
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name = name.substr(name.find_first_not_of("._")); // Skip . and _ prefixes.
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if (name == "debug_info")
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InfoSection = data;
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else if (name == "debug_abbrev")
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AbbrevSection = data;
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else if (name == "debug_line")
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LineSection = data;
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else if (name == "debug_aranges")
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ARangeSection = data;
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else if (name == "debug_str")
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StringSection = data;
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else if (name == "debug_ranges") {
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// FIXME: Use the other dwo range section when we emit it.
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RangeDWOSection = data;
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RangeSection = data;
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}
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else if (name == "debug_info.dwo")
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InfoDWOSection = data;
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else if (name == "debug_abbrev.dwo")
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AbbrevDWOSection = data;
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else if (name == "debug_str.dwo")
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StringDWOSection = data;
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else if (name == "debug_str_offsets.dwo")
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StringOffsetDWOSection = data;
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// Any more debug info sections go here.
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else
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continue;
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// TODO: For now only handle relocations for the debug_info section.
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RelocAddrMap *Map;
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if (name == "debug_info")
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Map = &InfoRelocMap;
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else if (name == "debug_info.dwo")
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Map = &InfoDWORelocMap;
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else
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continue;
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if (i->begin_relocations() != i->end_relocations()) {
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uint64_t SectionSize;
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i->getSize(SectionSize);
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for (object::relocation_iterator reloc_i = i->begin_relocations(),
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reloc_e = i->end_relocations();
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reloc_i != reloc_e; reloc_i.increment(ec)) {
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uint64_t Address;
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reloc_i->getAddress(Address);
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uint64_t Type;
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reloc_i->getType(Type);
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object::RelocVisitor V(Obj->getFileFormatName());
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// The section address is always 0 for debug sections.
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object::RelocToApply R(V.visit(Type, *reloc_i));
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if (V.error()) {
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SmallString<32> Name;
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error_code ec(reloc_i->getTypeName(Name));
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if (ec) {
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errs() << "Aaaaaa! Nameless relocation! Aaaaaa!\n";
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}
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errs() << "error: failed to compute relocation: "
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<< Name << "\n";
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continue;
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}
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if (Address + R.Width > SectionSize) {
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errs() << "error: " << R.Width << "-byte relocation starting "
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<< Address << " bytes into section " << name << " which is "
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<< SectionSize << " bytes long.\n";
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continue;
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}
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if (R.Width > 8) {
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errs() << "error: can't handle a relocation of more than 8 bytes at "
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"a time.\n";
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continue;
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}
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DEBUG(dbgs() << "Writing " << format("%p", R.Value)
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<< " at " << format("%p", Address)
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<< " with width " << format("%d", R.Width)
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<< "\n");
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Map->insert(std::make_pair(Address, std::make_pair(R.Width, R.Value)));
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}
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}
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}
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}
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void DWARFContextInMemory::anchor() { }
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