forked from OSchip/llvm-project
96 lines
3.9 KiB
C++
96 lines
3.9 KiB
C++
//===- DWARFDebugInfoEntry.cpp --------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/DebugInfo/DWARF/DWARFDebugInfoEntry.h"
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#include "llvm/ADT/Optional.h"
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#include "llvm/DebugInfo/DWARF/DWARFContext.h"
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#include "llvm/DebugInfo/DWARF/DWARFDataExtractor.h"
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#include "llvm/DebugInfo/DWARF/DWARFDebugAbbrev.h"
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#include "llvm/DebugInfo/DWARF/DWARFFormValue.h"
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#include "llvm/DebugInfo/DWARF/DWARFUnit.h"
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#include "llvm/Support/Errc.h"
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#include <cstddef>
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#include <cstdint>
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using namespace llvm;
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using namespace dwarf;
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bool DWARFDebugInfoEntry::extractFast(const DWARFUnit &U, uint64_t *OffsetPtr,
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const DWARFDataExtractor &DebugInfoData,
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uint64_t UEndOffset, uint32_t ParentIdx) {
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Offset = *OffsetPtr;
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this->ParentIdx = ParentIdx;
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if (Offset >= UEndOffset) {
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U.getContext().getWarningHandler()(
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createStringError(errc::invalid_argument,
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"DWARF unit from offset 0x%8.8" PRIx64 " incl. "
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"to offset 0x%8.8" PRIx64 " excl. "
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"tries to read DIEs at offset 0x%8.8" PRIx64,
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U.getOffset(), U.getNextUnitOffset(), *OffsetPtr));
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return false;
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}
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assert(DebugInfoData.isValidOffset(UEndOffset - 1));
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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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const auto *AbbrevSet = U.getAbbreviations();
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if (!AbbrevSet) {
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U.getContext().getWarningHandler()(
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createStringError(errc::invalid_argument,
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"DWARF unit at offset 0x%8.8" PRIx64 " "
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"contains invalid abbreviation set offset 0x%" PRIx64,
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U.getOffset(), U.getAbbreviationsOffset()));
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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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AbbrevDecl = AbbrevSet->getAbbreviationDeclaration(AbbrCode);
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if (!AbbrevDecl) {
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U.getContext().getWarningHandler()(
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createStringError(errc::invalid_argument,
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"DWARF unit at offset 0x%8.8" PRIx64 " "
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"contains invalid abbreviation %" PRIu64 " at "
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"offset 0x%8.8" PRIx64 ", valid abbreviations are %s",
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U.getOffset(), AbbrCode, *OffsetPtr,
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AbbrevSet->getCodeRange().c_str()));
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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 (auto 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.getFormParams())) {
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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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U.getContext().getWarningHandler()(createStringError(
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errc::invalid_argument,
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"DWARF unit at offset 0x%8.8" PRIx64 " "
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"contains invalid FORM_* 0x%" PRIx16 " at offset 0x%8.8" PRIx64,
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U.getOffset(), AttrSpec.Form, *OffsetPtr));
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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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