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In preparation for adding PDB support to LLVM, this moves the DWARF parsing code to its own subdirectory under DebugInfo, and renames LLVMDebugInfo to LLVMDebugInfoDWARF. This is purely a mechanical / build system change. Differential Revision: http://reviews.llvm.org/D7269 Reviewed by: Eric Christopher git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@227586 91177308-0d34-0410-b5e6-96231b3b80d8
697 lines
25 KiB
C++
697 lines
25 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 "llvm/DebugInfo/DWARF/DWARFContext.h"
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/StringSwitch.h"
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#include "llvm/DebugInfo/DWARF/DWARFAcceleratorTable.h"
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#include "llvm/DebugInfo/DWARF/DWARFDebugArangeSet.h"
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#include "llvm/Support/Compression.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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using namespace object;
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#define DEBUG_TYPE "dwarf"
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typedef DWARFDebugLine::LineTable DWARFLineTable;
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typedef DILineInfoSpecifier::FileLineInfoKind FileLineInfoKind;
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typedef DILineInfoSpecifier::FunctionNameKind FunctionNameKind;
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static void dumpPubSection(raw_ostream &OS, StringRef Name, StringRef Data,
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bool LittleEndian, bool GnuStyle) {
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OS << "\n." << Name << " contents:\n";
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DataExtractor pubNames(Data, LittleEndian, 0);
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uint32_t offset = 0;
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while (pubNames.isValidOffset(offset)) {
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OS << "length = " << format("0x%08x", pubNames.getU32(&offset));
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OS << " version = " << format("0x%04x", pubNames.getU16(&offset));
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OS << " unit_offset = " << format("0x%08x", pubNames.getU32(&offset));
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OS << " unit_size = " << format("0x%08x", pubNames.getU32(&offset)) << '\n';
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if (GnuStyle)
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OS << "Offset Linkage Kind Name\n";
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else
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OS << "Offset Name\n";
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while (offset < Data.size()) {
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uint32_t dieRef = pubNames.getU32(&offset);
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if (dieRef == 0)
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break;
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OS << format("0x%8.8x ", dieRef);
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if (GnuStyle) {
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PubIndexEntryDescriptor desc(pubNames.getU8(&offset));
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OS << format("%-8s", dwarf::GDBIndexEntryLinkageString(desc.Linkage))
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<< ' ' << format("%-8s", dwarf::GDBIndexEntryKindString(desc.Kind))
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<< ' ';
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}
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OS << '\"' << pubNames.getCStr(&offset) << "\"\n";
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}
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}
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}
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static void dumpAccelSection(raw_ostream &OS, StringRef Name,
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const DWARFSection& Section, StringRef StringSection,
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bool LittleEndian) {
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DataExtractor AccelSection(Section.Data, LittleEndian, 0);
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DataExtractor StrData(StringSection, LittleEndian, 0);
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OS << "\n." << Name << " contents:\n";
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DWARFAcceleratorTable Accel(AccelSection, StrData, Section.Relocs);
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if (!Accel.extract())
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return;
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Accel.dump(OS);
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}
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void DWARFContext::dump(raw_ostream &OS, DIDumpType DumpType) {
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if (DumpType == DIDT_All || DumpType == DIDT_Abbrev) {
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OS << ".debug_abbrev contents:\n";
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getDebugAbbrev()->dump(OS);
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}
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if (DumpType == DIDT_All || DumpType == DIDT_AbbrevDwo)
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if (const DWARFDebugAbbrev *D = getDebugAbbrevDWO()) {
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OS << "\n.debug_abbrev.dwo contents:\n";
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D->dump(OS);
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}
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if (DumpType == DIDT_All || DumpType == DIDT_Info) {
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OS << "\n.debug_info contents:\n";
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for (const auto &CU : compile_units())
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CU->dump(OS);
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}
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if ((DumpType == DIDT_All || DumpType == DIDT_InfoDwo) &&
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getNumDWOCompileUnits()) {
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OS << "\n.debug_info.dwo contents:\n";
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for (const auto &DWOCU : dwo_compile_units())
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DWOCU->dump(OS);
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}
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if ((DumpType == DIDT_All || DumpType == DIDT_Types) && getNumTypeUnits()) {
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OS << "\n.debug_types contents:\n";
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for (const auto &TUS : type_unit_sections())
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for (const auto &TU : TUS)
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TU->dump(OS);
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}
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if ((DumpType == DIDT_All || DumpType == DIDT_TypesDwo) &&
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getNumDWOTypeUnits()) {
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OS << "\n.debug_types.dwo contents:\n";
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for (const auto &DWOTUS : dwo_type_unit_sections())
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for (const auto &DWOTU : DWOTUS)
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DWOTU->dump(OS);
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}
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if (DumpType == DIDT_All || DumpType == DIDT_Loc) {
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OS << "\n.debug_loc contents:\n";
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getDebugLoc()->dump(OS);
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}
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if (DumpType == DIDT_All || DumpType == DIDT_LocDwo) {
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OS << "\n.debug_loc.dwo contents:\n";
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getDebugLocDWO()->dump(OS);
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}
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if (DumpType == DIDT_All || DumpType == DIDT_Frames) {
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OS << "\n.debug_frame contents:\n";
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getDebugFrame()->dump(OS);
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}
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uint32_t offset = 0;
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if (DumpType == DIDT_All || DumpType == DIDT_Aranges) {
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OS << "\n.debug_aranges contents:\n";
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DataExtractor arangesData(getARangeSection(), isLittleEndian(), 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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}
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uint8_t savedAddressByteSize = 0;
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if (DumpType == DIDT_All || DumpType == DIDT_Line) {
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OS << "\n.debug_line contents:\n";
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for (const auto &CU : compile_units()) {
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savedAddressByteSize = CU->getAddressByteSize();
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unsigned stmtOffset =
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CU->getCompileUnitDIE()->getAttributeValueAsSectionOffset(
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CU.get(), DW_AT_stmt_list, -1U);
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if (stmtOffset != -1U) {
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DataExtractor lineData(getLineSection().Data, isLittleEndian(),
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savedAddressByteSize);
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DWARFDebugLine::LineTable LineTable;
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LineTable.parse(lineData, &getLineSection().Relocs, &stmtOffset);
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LineTable.dump(OS);
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}
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}
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}
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if (DumpType == DIDT_All || DumpType == DIDT_LineDwo) {
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OS << "\n.debug_line.dwo contents:\n";
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unsigned stmtOffset = 0;
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DataExtractor lineData(getLineDWOSection().Data, isLittleEndian(),
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savedAddressByteSize);
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DWARFDebugLine::LineTable LineTable;
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while (LineTable.Prologue.parse(lineData, &stmtOffset)) {
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LineTable.dump(OS);
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LineTable.clear();
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}
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}
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if (DumpType == DIDT_All || DumpType == DIDT_Str) {
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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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}
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if ((DumpType == DIDT_All || DumpType == DIDT_StrDwo) &&
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!getStringDWOSection().empty()) {
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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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if (DumpType == DIDT_All || DumpType == DIDT_Ranges) {
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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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}
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if (DumpType == DIDT_All || DumpType == DIDT_Pubnames)
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dumpPubSection(OS, "debug_pubnames", getPubNamesSection(),
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isLittleEndian(), false);
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if (DumpType == DIDT_All || DumpType == DIDT_Pubtypes)
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dumpPubSection(OS, "debug_pubtypes", getPubTypesSection(),
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isLittleEndian(), false);
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if (DumpType == DIDT_All || DumpType == DIDT_GnuPubnames)
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dumpPubSection(OS, "debug_gnu_pubnames", getGnuPubNamesSection(),
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isLittleEndian(), true /* GnuStyle */);
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if (DumpType == DIDT_All || DumpType == DIDT_GnuPubtypes)
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dumpPubSection(OS, "debug_gnu_pubtypes", getGnuPubTypesSection(),
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isLittleEndian(), true /* GnuStyle */);
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if ((DumpType == DIDT_All || DumpType == DIDT_StrOffsetsDwo) &&
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!getStringOffsetDWOSection().empty()) {
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OS << "\n.debug_str_offsets.dwo contents:\n";
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DataExtractor strOffsetExt(getStringOffsetDWOSection(), isLittleEndian(),
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0);
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offset = 0;
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uint64_t size = getStringOffsetDWOSection().size();
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while (offset < size) {
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OS << format("0x%8.8x: ", offset);
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OS << format("%8.8x\n", strOffsetExt.getU32(&offset));
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}
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}
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if (DumpType == DIDT_All || DumpType == DIDT_AppleNames)
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dumpAccelSection(OS, "apple_names", getAppleNamesSection(),
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getStringSection(), isLittleEndian());
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if (DumpType == DIDT_All || DumpType == DIDT_AppleTypes)
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dumpAccelSection(OS, "apple_types", getAppleTypesSection(),
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getStringSection(), isLittleEndian());
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if (DumpType == DIDT_All || DumpType == DIDT_AppleNamespaces)
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dumpAccelSection(OS, "apple_namespaces", getAppleNamespacesSection(),
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getStringSection(), isLittleEndian());
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if (DumpType == DIDT_All || DumpType == DIDT_AppleObjC)
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dumpAccelSection(OS, "apple_objc", getAppleObjCSection(),
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getStringSection(), isLittleEndian());
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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->extract(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->extract(abbrData);
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return AbbrevDWO.get();
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}
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const DWARFDebugLoc *DWARFContext::getDebugLoc() {
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if (Loc)
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return Loc.get();
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DataExtractor LocData(getLocSection().Data, isLittleEndian(), 0);
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Loc.reset(new DWARFDebugLoc(getLocSection().Relocs));
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// assume all compile units have the same address byte size
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if (getNumCompileUnits())
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Loc->parse(LocData, getCompileUnitAtIndex(0)->getAddressByteSize());
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return Loc.get();
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}
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const DWARFDebugLocDWO *DWARFContext::getDebugLocDWO() {
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if (LocDWO)
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return LocDWO.get();
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DataExtractor LocData(getLocDWOSection().Data, isLittleEndian(), 0);
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LocDWO.reset(new DWARFDebugLocDWO());
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LocDWO->parse(LocData);
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return LocDWO.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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Aranges.reset(new DWARFDebugAranges());
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Aranges->generate(this);
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return Aranges.get();
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}
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const DWARFDebugFrame *DWARFContext::getDebugFrame() {
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if (DebugFrame)
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return DebugFrame.get();
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// There's a "bug" in the DWARFv3 standard with respect to the target address
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// size within debug frame sections. While DWARF is supposed to be independent
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// of its container, FDEs have fields with size being "target address size",
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// which isn't specified in DWARF in general. It's only specified for CUs, but
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// .eh_frame can appear without a .debug_info section. Follow the example of
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// other tools (libdwarf) and extract this from the container (ObjectFile
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// provides this information). This problem is fixed in DWARFv4
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// See this dwarf-discuss discussion for more details:
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// http://lists.dwarfstd.org/htdig.cgi/dwarf-discuss-dwarfstd.org/2011-December/001173.html
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DataExtractor debugFrameData(getDebugFrameSection(), isLittleEndian(),
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getAddressSize());
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DebugFrame.reset(new DWARFDebugFrame());
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DebugFrame->parse(debugFrameData);
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return DebugFrame.get();
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}
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const DWARFLineTable *
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DWARFContext::getLineTableForUnit(DWARFUnit *cu) {
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if (!Line)
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Line.reset(new DWARFDebugLine(&getLineSection().Relocs));
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unsigned stmtOffset =
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cu->getCompileUnitDIE()->getAttributeValueAsSectionOffset(
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cu, DW_AT_stmt_list, -1U);
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if (stmtOffset == -1U)
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return nullptr; // 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().Data, 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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CUs.parse(*this, getInfoSection());
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}
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void DWARFContext::parseTypeUnits() {
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if (!TUs.empty())
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return;
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for (const auto &I : getTypesSections()) {
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TUs.push_back(DWARFUnitSection<DWARFTypeUnit>());
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TUs.back().parse(*this, I.second);
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}
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}
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void DWARFContext::parseDWOCompileUnits() {
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DWOCUs.parseDWO(*this, getInfoDWOSection());
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}
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void DWARFContext::parseDWOTypeUnits() {
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if (!DWOTUs.empty())
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return;
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for (const auto &I : getTypesDWOSections()) {
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DWOTUs.push_back(DWARFUnitSection<DWARFTypeUnit>());
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DWOTUs.back().parseDWO(*this, I.second);
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}
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}
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DWARFCompileUnit *DWARFContext::getCompileUnitForOffset(uint32_t Offset) {
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parseCompileUnits();
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return CUs.getUnitForOffset(Offset);
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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 getFunctionNameForAddress(DWARFCompileUnit *CU, uint64_t Address,
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FunctionNameKind Kind,
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std::string &FunctionName) {
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if (Kind == FunctionNameKind::None)
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return false;
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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 DWARFDebugInfoEntryInlinedChain &InlinedChain =
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CU->getInlinedChainForAddress(Address);
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if (InlinedChain.DIEs.size() == 0)
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return false;
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const DWARFDebugInfoEntryMinimal &TopFunctionDIE = InlinedChain.DIEs[0];
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if (const char *Name =
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TopFunctionDIE.getSubroutineName(InlinedChain.U, Kind)) {
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FunctionName = Name;
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return true;
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}
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return false;
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}
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DILineInfo DWARFContext::getLineInfoForAddress(uint64_t Address,
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DILineInfoSpecifier Spec) {
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DILineInfo Result;
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DWARFCompileUnit *CU = getCompileUnitForAddress(Address);
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if (!CU)
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return Result;
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getFunctionNameForAddress(CU, Address, Spec.FNKind, Result.FunctionName);
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if (Spec.FLIKind != FileLineInfoKind::None) {
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if (const DWARFLineTable *LineTable = getLineTableForUnit(CU))
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LineTable->getFileLineInfoForAddress(Address, CU->getCompilationDir(),
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Spec.FLIKind, Result);
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}
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return Result;
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}
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DILineInfoTable
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DWARFContext::getLineInfoForAddressRange(uint64_t Address, uint64_t Size,
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DILineInfoSpecifier Spec) {
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DILineInfoTable Lines;
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DWARFCompileUnit *CU = getCompileUnitForAddress(Address);
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if (!CU)
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return Lines;
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std::string FunctionName = "<invalid>";
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getFunctionNameForAddress(CU, Address, Spec.FNKind, FunctionName);
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// If the Specifier says we don't need FileLineInfo, just
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// return the top-most function at the starting address.
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if (Spec.FLIKind == FileLineInfoKind::None) {
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DILineInfo Result;
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Result.FunctionName = FunctionName;
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Lines.push_back(std::make_pair(Address, Result));
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return Lines;
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}
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const DWARFLineTable *LineTable = getLineTableForUnit(CU);
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// Get the index of row we're looking for in the line table.
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std::vector<uint32_t> RowVector;
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if (!LineTable->lookupAddressRange(Address, Size, RowVector))
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return Lines;
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for (uint32_t RowIndex : RowVector) {
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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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DILineInfo Result;
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LineTable->getFileNameByIndex(Row.File, CU->getCompilationDir(),
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Spec.FLIKind, Result.FileName);
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Result.FunctionName = FunctionName;
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Result.Line = Row.Line;
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Result.Column = Row.Column;
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Lines.push_back(std::make_pair(Row.Address, Result));
|
|
}
|
|
|
|
return Lines;
|
|
}
|
|
|
|
DIInliningInfo
|
|
DWARFContext::getInliningInfoForAddress(uint64_t Address,
|
|
DILineInfoSpecifier Spec) {
|
|
DIInliningInfo InliningInfo;
|
|
|
|
DWARFCompileUnit *CU = getCompileUnitForAddress(Address);
|
|
if (!CU)
|
|
return InliningInfo;
|
|
|
|
const DWARFLineTable *LineTable = nullptr;
|
|
const DWARFDebugInfoEntryInlinedChain &InlinedChain =
|
|
CU->getInlinedChainForAddress(Address);
|
|
if (InlinedChain.DIEs.size() == 0) {
|
|
// If there is no DIE for address (e.g. it is in unavailable .dwo file),
|
|
// try to at least get file/line info from symbol table.
|
|
if (Spec.FLIKind != FileLineInfoKind::None) {
|
|
DILineInfo Frame;
|
|
LineTable = getLineTableForUnit(CU);
|
|
if (LineTable &&
|
|
LineTable->getFileLineInfoForAddress(Address, CU->getCompilationDir(),
|
|
Spec.FLIKind, Frame))
|
|
InliningInfo.addFrame(Frame);
|
|
}
|
|
return InliningInfo;
|
|
}
|
|
|
|
uint32_t CallFile = 0, CallLine = 0, CallColumn = 0;
|
|
for (uint32_t i = 0, n = InlinedChain.DIEs.size(); i != n; i++) {
|
|
const DWARFDebugInfoEntryMinimal &FunctionDIE = InlinedChain.DIEs[i];
|
|
DILineInfo Frame;
|
|
// Get function name if necessary.
|
|
if (const char *Name =
|
|
FunctionDIE.getSubroutineName(InlinedChain.U, Spec.FNKind))
|
|
Frame.FunctionName = Name;
|
|
if (Spec.FLIKind != FileLineInfoKind::None) {
|
|
if (i == 0) {
|
|
// For the topmost frame, initialize the line table of this
|
|
// compile unit and fetch file/line info from it.
|
|
LineTable = getLineTableForUnit(CU);
|
|
// For the topmost routine, get file/line info from line table.
|
|
if (LineTable)
|
|
LineTable->getFileLineInfoForAddress(Address, CU->getCompilationDir(),
|
|
Spec.FLIKind, Frame);
|
|
} else {
|
|
// Otherwise, use call file, call line and call column from
|
|
// previous DIE in inlined chain.
|
|
if (LineTable)
|
|
LineTable->getFileNameByIndex(CallFile, CU->getCompilationDir(),
|
|
Spec.FLIKind, Frame.FileName);
|
|
Frame.Line = CallLine;
|
|
Frame.Column = CallColumn;
|
|
}
|
|
// Get call file/line/column of a current DIE.
|
|
if (i + 1 < n) {
|
|
FunctionDIE.getCallerFrame(InlinedChain.U, CallFile, CallLine,
|
|
CallColumn);
|
|
}
|
|
}
|
|
InliningInfo.addFrame(Frame);
|
|
}
|
|
return InliningInfo;
|
|
}
|
|
|
|
static bool consumeCompressedDebugSectionHeader(StringRef &data,
|
|
uint64_t &OriginalSize) {
|
|
// Consume "ZLIB" prefix.
|
|
if (!data.startswith("ZLIB"))
|
|
return false;
|
|
data = data.substr(4);
|
|
// Consume uncompressed section size (big-endian 8 bytes).
|
|
DataExtractor extractor(data, false, 8);
|
|
uint32_t Offset = 0;
|
|
OriginalSize = extractor.getU64(&Offset);
|
|
if (Offset == 0)
|
|
return false;
|
|
data = data.substr(Offset);
|
|
return true;
|
|
}
|
|
|
|
DWARFContextInMemory::DWARFContextInMemory(const object::ObjectFile &Obj)
|
|
: IsLittleEndian(Obj.isLittleEndian()),
|
|
AddressSize(Obj.getBytesInAddress()) {
|
|
for (const SectionRef &Section : Obj.sections()) {
|
|
StringRef name;
|
|
Section.getName(name);
|
|
// Skip BSS and Virtual sections, they aren't interesting.
|
|
bool IsBSS = Section.isBSS();
|
|
if (IsBSS)
|
|
continue;
|
|
bool IsVirtual = Section.isVirtual();
|
|
if (IsVirtual)
|
|
continue;
|
|
StringRef data;
|
|
Section.getContents(data);
|
|
|
|
name = name.substr(name.find_first_not_of("._")); // Skip . and _ prefixes.
|
|
|
|
// Check if debug info section is compressed with zlib.
|
|
if (name.startswith("zdebug_")) {
|
|
uint64_t OriginalSize;
|
|
if (!zlib::isAvailable() ||
|
|
!consumeCompressedDebugSectionHeader(data, OriginalSize))
|
|
continue;
|
|
UncompressedSections.resize(UncompressedSections.size() + 1);
|
|
if (zlib::uncompress(data, UncompressedSections.back(), OriginalSize) !=
|
|
zlib::StatusOK) {
|
|
UncompressedSections.pop_back();
|
|
continue;
|
|
}
|
|
// Make data point to uncompressed section contents and save its contents.
|
|
name = name.substr(1);
|
|
data = UncompressedSections.back();
|
|
}
|
|
|
|
StringRef *SectionData =
|
|
StringSwitch<StringRef *>(name)
|
|
.Case("debug_info", &InfoSection.Data)
|
|
.Case("debug_abbrev", &AbbrevSection)
|
|
.Case("debug_loc", &LocSection.Data)
|
|
.Case("debug_line", &LineSection.Data)
|
|
.Case("debug_aranges", &ARangeSection)
|
|
.Case("debug_frame", &DebugFrameSection)
|
|
.Case("debug_str", &StringSection)
|
|
.Case("debug_ranges", &RangeSection)
|
|
.Case("debug_pubnames", &PubNamesSection)
|
|
.Case("debug_pubtypes", &PubTypesSection)
|
|
.Case("debug_gnu_pubnames", &GnuPubNamesSection)
|
|
.Case("debug_gnu_pubtypes", &GnuPubTypesSection)
|
|
.Case("debug_info.dwo", &InfoDWOSection.Data)
|
|
.Case("debug_abbrev.dwo", &AbbrevDWOSection)
|
|
.Case("debug_loc.dwo", &LocDWOSection.Data)
|
|
.Case("debug_line.dwo", &LineDWOSection.Data)
|
|
.Case("debug_str.dwo", &StringDWOSection)
|
|
.Case("debug_str_offsets.dwo", &StringOffsetDWOSection)
|
|
.Case("debug_addr", &AddrSection)
|
|
.Case("apple_names", &AppleNamesSection.Data)
|
|
.Case("apple_types", &AppleTypesSection.Data)
|
|
.Case("apple_namespaces", &AppleNamespacesSection.Data)
|
|
.Case("apple_namespac", &AppleNamespacesSection.Data)
|
|
.Case("apple_objc", &AppleObjCSection.Data)
|
|
// Any more debug info sections go here.
|
|
.Default(nullptr);
|
|
if (SectionData) {
|
|
*SectionData = data;
|
|
if (name == "debug_ranges") {
|
|
// FIXME: Use the other dwo range section when we emit it.
|
|
RangeDWOSection = data;
|
|
}
|
|
} else if (name == "debug_types") {
|
|
// Find debug_types data by section rather than name as there are
|
|
// multiple, comdat grouped, debug_types sections.
|
|
TypesSections[Section].Data = data;
|
|
} else if (name == "debug_types.dwo") {
|
|
TypesDWOSections[Section].Data = data;
|
|
}
|
|
|
|
section_iterator RelocatedSection = Section.getRelocatedSection();
|
|
if (RelocatedSection == Obj.section_end())
|
|
continue;
|
|
|
|
StringRef RelSecName;
|
|
RelocatedSection->getName(RelSecName);
|
|
RelSecName = RelSecName.substr(
|
|
RelSecName.find_first_not_of("._")); // Skip . and _ prefixes.
|
|
|
|
// TODO: Add support for relocations in other sections as needed.
|
|
// Record relocations for the debug_info and debug_line sections.
|
|
RelocAddrMap *Map = StringSwitch<RelocAddrMap*>(RelSecName)
|
|
.Case("debug_info", &InfoSection.Relocs)
|
|
.Case("debug_loc", &LocSection.Relocs)
|
|
.Case("debug_info.dwo", &InfoDWOSection.Relocs)
|
|
.Case("debug_line", &LineSection.Relocs)
|
|
.Case("apple_names", &AppleNamesSection.Relocs)
|
|
.Case("apple_types", &AppleTypesSection.Relocs)
|
|
.Case("apple_namespaces", &AppleNamespacesSection.Relocs)
|
|
.Case("apple_namespac", &AppleNamespacesSection.Relocs)
|
|
.Case("apple_objc", &AppleObjCSection.Relocs)
|
|
.Default(nullptr);
|
|
if (!Map) {
|
|
// Find debug_types relocs by section rather than name as there are
|
|
// multiple, comdat grouped, debug_types sections.
|
|
if (RelSecName == "debug_types")
|
|
Map = &TypesSections[*RelocatedSection].Relocs;
|
|
else if (RelSecName == "debug_types.dwo")
|
|
Map = &TypesDWOSections[*RelocatedSection].Relocs;
|
|
else
|
|
continue;
|
|
}
|
|
|
|
if (Section.relocation_begin() != Section.relocation_end()) {
|
|
uint64_t SectionSize = RelocatedSection->getSize();
|
|
for (const RelocationRef &Reloc : Section.relocations()) {
|
|
uint64_t Address;
|
|
Reloc.getOffset(Address);
|
|
uint64_t Type;
|
|
Reloc.getType(Type);
|
|
uint64_t SymAddr = 0;
|
|
object::symbol_iterator Sym = Reloc.getSymbol();
|
|
if (Sym != Obj.symbol_end())
|
|
Sym->getAddress(SymAddr);
|
|
|
|
object::RelocVisitor V(Obj);
|
|
object::RelocToApply R(V.visit(Type, Reloc, SymAddr));
|
|
if (V.error()) {
|
|
SmallString<32> Name;
|
|
std::error_code ec(Reloc.getTypeName(Name));
|
|
if (ec) {
|
|
errs() << "Aaaaaa! Nameless relocation! Aaaaaa!\n";
|
|
}
|
|
errs() << "error: failed to compute relocation: "
|
|
<< Name << "\n";
|
|
continue;
|
|
}
|
|
|
|
if (Address + R.Width > SectionSize) {
|
|
errs() << "error: " << R.Width << "-byte relocation starting "
|
|
<< Address << " bytes into section " << name << " which is "
|
|
<< SectionSize << " bytes long.\n";
|
|
continue;
|
|
}
|
|
if (R.Width > 8) {
|
|
errs() << "error: can't handle a relocation of more than 8 bytes at "
|
|
"a time.\n";
|
|
continue;
|
|
}
|
|
DEBUG(dbgs() << "Writing " << format("%p", R.Value)
|
|
<< " at " << format("%p", Address)
|
|
<< " with width " << format("%d", R.Width)
|
|
<< "\n");
|
|
Map->insert(std::make_pair(Address, std::make_pair(R.Width, R.Value)));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void DWARFContextInMemory::anchor() { }
|