1 //===-- DWARFDebugInfoEntry.cpp -------------------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #include "SyntaxHighlighting.h"
11 #include "llvm/DebugInfo/DWARF/DWARFCompileUnit.h"
12 #include "llvm/DebugInfo/DWARF/DWARFContext.h"
13 #include "llvm/DebugInfo/DWARF/DWARFDebugAbbrev.h"
14 #include "llvm/DebugInfo/DWARF/DWARFDebugInfoEntry.h"
15 #include "llvm/DebugInfo/DWARF/DWARFFormValue.h"
16 #include "llvm/Support/DataTypes.h"
17 #include "llvm/Support/Debug.h"
18 #include "llvm/Support/Dwarf.h"
19 #include "llvm/Support/Format.h"
20 #include "llvm/Support/raw_ostream.h"
22 using namespace dwarf;
23 using namespace syntax;
25 bool DWARFDebugInfoEntry::extractFast(const DWARFUnit &U,
26 uint32_t *OffsetPtr) {
27 DataExtractor DebugInfoData = U.getDebugInfoExtractor();
28 const uint32_t UEndOffset = U.getNextUnitOffset();
29 return extractFast(U, OffsetPtr, DebugInfoData, UEndOffset, 0);
31 bool DWARFDebugInfoEntry::extractFast(const DWARFUnit &U, uint32_t *OffsetPtr,
32 const DataExtractor &DebugInfoData,
33 uint32_t UEndOffset, uint32_t D) {
36 if (Offset >= UEndOffset || !DebugInfoData.isValidOffset(Offset))
38 uint64_t AbbrCode = DebugInfoData.getULEB128(OffsetPtr);
40 // NULL debug tag entry.
44 AbbrevDecl = U.getAbbreviations()->getAbbreviationDeclaration(AbbrCode);
45 if (nullptr == AbbrevDecl) {
46 // Restore the original offset.
50 // See if all attributes in this DIE have fixed byte sizes. If so, we can
51 // just add this size to the offset to skip to the next DIE.
52 if (Optional<size_t> FixedSize = AbbrevDecl->getFixedAttributesByteSize(U)) {
53 *OffsetPtr += *FixedSize;
57 // Skip all data in the .debug_info for the attributes
58 for (const auto &AttrSpec : AbbrevDecl->attributes()) {
59 // Check if this attribute has a fixed byte size.
60 if (auto FixedSize = AttrSpec.getByteSize(U)) {
61 // Attribute byte size if fixed, just add the size to the offset.
62 *OffsetPtr += *FixedSize;
63 } else if (!DWARFFormValue::skipValue(AttrSpec.Form, DebugInfoData,
65 // We failed to skip this attribute's value, restore the original offset
66 // and return the failure status.