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aadbc74cdf
In order for the llvm DWARF parser to be used in LLDB we will need to be able to get the parent of a DIE. This patch adds that functionality by changing the DWARFDebugInfoEntry class to store a depth field instead of a sibling index. Using a depth field allows us to easily calculate the sibling and the parent without increasing the size of DWARFDebugInfoEntry. I tested llvm-dsymutil on a debug version of clang where this fully parses DWARF in over 1200 .o files to verify there was no serious regression in performance. Added a full suite of unit tests to test this functionality. Differential Revision: https://reviews.llvm.org/D27995 llvm-svn: 290274
73 lines
2.7 KiB
C++
73 lines
2.7 KiB
C++
//===-- DWARFDebugInfoEntry.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 "SyntaxHighlighting.h"
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#include "llvm/DebugInfo/DWARF/DWARFCompileUnit.h"
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#include "llvm/DebugInfo/DWARF/DWARFContext.h"
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#include "llvm/DebugInfo/DWARF/DWARFDebugAbbrev.h"
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#include "llvm/DebugInfo/DWARF/DWARFDebugInfoEntry.h"
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#include "llvm/DebugInfo/DWARF/DWARFFormValue.h"
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#include "llvm/Support/DataTypes.h"
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#include "llvm/Support/Debug.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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using namespace llvm;
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using namespace dwarf;
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using namespace syntax;
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bool DWARFDebugInfoEntry::extractFast(const DWARFUnit &U,
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uint32_t *OffsetPtr) {
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DataExtractor DebugInfoData = U.getDebugInfoExtractor();
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const uint32_t UEndOffset = U.getNextUnitOffset();
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return extractFast(U, OffsetPtr, DebugInfoData, UEndOffset, 0);
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}
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bool DWARFDebugInfoEntry::extractFast(const DWARFUnit &U, uint32_t *OffsetPtr,
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const DataExtractor &DebugInfoData,
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uint32_t UEndOffset, uint32_t D) {
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Offset = *OffsetPtr;
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Depth = D;
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if (Offset >= UEndOffset || !DebugInfoData.isValidOffset(Offset))
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return false;
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uint64_t AbbrCode = DebugInfoData.getULEB128(OffsetPtr);
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if (0 == AbbrCode) {
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// NULL debug tag entry.
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AbbrevDecl = nullptr;
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return true;
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}
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AbbrevDecl = U.getAbbreviations()->getAbbreviationDeclaration(AbbrCode);
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if (nullptr == AbbrevDecl) {
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// Restore the original offset.
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*OffsetPtr = Offset;
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return false;
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}
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// See if all attributes in this DIE have fixed byte sizes. If so, we can
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// just add this size to the offset to skip to the next DIE.
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if (Optional<size_t> FixedSize = AbbrevDecl->getFixedAttributesByteSize(U)) {
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*OffsetPtr += *FixedSize;
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return true;
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}
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// Skip all data in the .debug_info for the attributes
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for (const auto &AttrSpec : AbbrevDecl->attributes()) {
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// Check if this attribute has a fixed byte size.
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if (Optional<uint8_t> FixedSize = AttrSpec.getByteSize(U)) {
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// Attribute byte size if fixed, just add the size to the offset.
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*OffsetPtr += *FixedSize;
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} else if (!DWARFFormValue::skipValue(AttrSpec.Form, DebugInfoData,
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OffsetPtr, &U)) {
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// We failed to skip this attribute's value, restore the original offset
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// and return the failure status.
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*OffsetPtr = Offset;
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return false;
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}
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}
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return true;
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}
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