2946cd7010
to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
139 lines
3.7 KiB
C++
139 lines
3.7 KiB
C++
//===- DWARFDebugAbbrev.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/DWARFDebugAbbrev.h"
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#include "llvm/Support/Format.h"
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#include "llvm/Support/raw_ostream.h"
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#include <algorithm>
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#include <cinttypes>
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#include <cstdint>
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using namespace llvm;
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DWARFAbbreviationDeclarationSet::DWARFAbbreviationDeclarationSet() {
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clear();
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}
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void DWARFAbbreviationDeclarationSet::clear() {
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Offset = 0;
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FirstAbbrCode = 0;
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Decls.clear();
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}
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bool DWARFAbbreviationDeclarationSet::extract(DataExtractor Data,
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uint32_t *OffsetPtr) {
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clear();
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const uint32_t BeginOffset = *OffsetPtr;
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Offset = BeginOffset;
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DWARFAbbreviationDeclaration AbbrDecl;
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uint32_t PrevAbbrCode = 0;
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while (AbbrDecl.extract(Data, OffsetPtr)) {
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if (FirstAbbrCode == 0) {
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FirstAbbrCode = AbbrDecl.getCode();
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} else {
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if (PrevAbbrCode + 1 != AbbrDecl.getCode()) {
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// Codes are not consecutive, can't do O(1) lookups.
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FirstAbbrCode = UINT32_MAX;
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}
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}
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PrevAbbrCode = AbbrDecl.getCode();
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Decls.push_back(std::move(AbbrDecl));
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}
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return BeginOffset != *OffsetPtr;
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}
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void DWARFAbbreviationDeclarationSet::dump(raw_ostream &OS) const {
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for (const auto &Decl : Decls)
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Decl.dump(OS);
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}
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const DWARFAbbreviationDeclaration *
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DWARFAbbreviationDeclarationSet::getAbbreviationDeclaration(
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uint32_t AbbrCode) const {
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if (FirstAbbrCode == UINT32_MAX) {
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for (const auto &Decl : Decls) {
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if (Decl.getCode() == AbbrCode)
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return &Decl;
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}
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return nullptr;
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}
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if (AbbrCode < FirstAbbrCode || AbbrCode >= FirstAbbrCode + Decls.size())
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return nullptr;
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return &Decls[AbbrCode - FirstAbbrCode];
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}
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DWARFDebugAbbrev::DWARFDebugAbbrev() { clear(); }
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void DWARFDebugAbbrev::clear() {
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AbbrDeclSets.clear();
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PrevAbbrOffsetPos = AbbrDeclSets.end();
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}
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void DWARFDebugAbbrev::extract(DataExtractor Data) {
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clear();
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this->Data = Data;
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}
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void DWARFDebugAbbrev::parse() const {
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if (!Data)
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return;
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uint32_t Offset = 0;
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DWARFAbbreviationDeclarationSet AbbrDecls;
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auto I = AbbrDeclSets.begin();
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while (Data->isValidOffset(Offset)) {
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while (I != AbbrDeclSets.end() && I->first < Offset)
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++I;
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uint32_t CUAbbrOffset = Offset;
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if (!AbbrDecls.extract(*Data, &Offset))
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break;
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AbbrDeclSets.insert(I, std::make_pair(CUAbbrOffset, std::move(AbbrDecls)));
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}
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Data = None;
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}
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void DWARFDebugAbbrev::dump(raw_ostream &OS) const {
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parse();
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if (AbbrDeclSets.empty()) {
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OS << "< EMPTY >\n";
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return;
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}
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for (const auto &I : AbbrDeclSets) {
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OS << format("Abbrev table for offset: 0x%8.8" PRIx64 "\n", I.first);
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I.second.dump(OS);
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}
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}
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const DWARFAbbreviationDeclarationSet*
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DWARFDebugAbbrev::getAbbreviationDeclarationSet(uint64_t CUAbbrOffset) const {
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const auto End = AbbrDeclSets.end();
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if (PrevAbbrOffsetPos != End && PrevAbbrOffsetPos->first == CUAbbrOffset) {
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return &(PrevAbbrOffsetPos->second);
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}
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const auto Pos = AbbrDeclSets.find(CUAbbrOffset);
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if (Pos != End) {
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PrevAbbrOffsetPos = Pos;
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return &(Pos->second);
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}
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if (Data && CUAbbrOffset < Data->getData().size()) {
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uint32_t Offset = CUAbbrOffset;
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DWARFAbbreviationDeclarationSet AbbrDecls;
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if (!AbbrDecls.extract(*Data, &Offset))
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return nullptr;
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PrevAbbrOffsetPos =
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AbbrDeclSets.insert(std::make_pair(CUAbbrOffset, std::move(AbbrDecls)))
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.first;
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return &PrevAbbrOffsetPos->second;
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}
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return nullptr;
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}
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