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//===- DWARFDebugAbbrev.cpp -----------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/DebugInfo/DWARF/DWARFDebugAbbrev.h"
#include "llvm/Support/Format.h"
#include "llvm/Support/raw_ostream.h"
#include <algorithm>
#include <cinttypes>
#include <cstdint>
using namespace llvm;
DWARFAbbreviationDeclarationSet::DWARFAbbreviationDeclarationSet() {
clear();
}
void DWARFAbbreviationDeclarationSet::clear() {
Offset = 0;
FirstAbbrCode = 0;
Decls.clear();
}
bool DWARFAbbreviationDeclarationSet::extract(DataExtractor Data,
uint64_t *OffsetPtr) {
clear();
const uint64_t BeginOffset = *OffsetPtr;
Offset = BeginOffset;
DWARFAbbreviationDeclaration AbbrDecl;
uint32_t PrevAbbrCode = 0;
while (AbbrDecl.extract(Data, OffsetPtr)) {
if (FirstAbbrCode == 0) {
FirstAbbrCode = AbbrDecl.getCode();
} else {
if (PrevAbbrCode + 1 != AbbrDecl.getCode()) {
// Codes are not consecutive, can't do O(1) lookups.
FirstAbbrCode = UINT32_MAX;
}
}
PrevAbbrCode = AbbrDecl.getCode();
Decls.push_back(std::move(AbbrDecl));
}
return BeginOffset != *OffsetPtr;
}
void DWARFAbbreviationDeclarationSet::dump(raw_ostream &OS) const {
for (const auto &Decl : Decls)
Decl.dump(OS);
}
const DWARFAbbreviationDeclaration *
DWARFAbbreviationDeclarationSet::getAbbreviationDeclaration(
uint32_t AbbrCode) const {
if (FirstAbbrCode == UINT32_MAX) {
for (const auto &Decl : Decls) {
if (Decl.getCode() == AbbrCode)
return &Decl;
}
return nullptr;
}
if (AbbrCode < FirstAbbrCode || AbbrCode >= FirstAbbrCode + Decls.size())
return nullptr;
return &Decls[AbbrCode - FirstAbbrCode];
}
DWARFDebugAbbrev::DWARFDebugAbbrev() { clear(); }
void DWARFDebugAbbrev::clear() {
AbbrDeclSets.clear();
PrevAbbrOffsetPos = AbbrDeclSets.end();
}
void DWARFDebugAbbrev::extract(DataExtractor Data) {
clear();
this->Data = Data;
}
void DWARFDebugAbbrev::parse() const {
if (!Data)
return;
uint64_t Offset = 0;
auto I = AbbrDeclSets.begin();
while (Data->isValidOffset(Offset)) {
while (I != AbbrDeclSets.end() && I->first < Offset)
++I;
uint64_t CUAbbrOffset = Offset;
DWARFAbbreviationDeclarationSet AbbrDecls;
if (!AbbrDecls.extract(*Data, &Offset))
break;
AbbrDeclSets.insert(I, std::make_pair(CUAbbrOffset, std::move(AbbrDecls)));
}
Data = None;
}
void DWARFDebugAbbrev::dump(raw_ostream &OS) const {
parse();
if (AbbrDeclSets.empty()) {
OS << "< EMPTY >\n";
return;
}
for (const auto &I : AbbrDeclSets) {
OS << format("Abbrev table for offset: 0x%8.8" PRIx64 "\n", I.first);
I.second.dump(OS);
}
}
const DWARFAbbreviationDeclarationSet*
DWARFDebugAbbrev::getAbbreviationDeclarationSet(uint64_t CUAbbrOffset) const {
const auto End = AbbrDeclSets.end();
if (PrevAbbrOffsetPos != End && PrevAbbrOffsetPos->first == CUAbbrOffset) {
return &(PrevAbbrOffsetPos->second);
}
const auto Pos = AbbrDeclSets.find(CUAbbrOffset);
if (Pos != End) {
PrevAbbrOffsetPos = Pos;
return &(Pos->second);
}
if (Data && CUAbbrOffset < Data->getData().size()) {
uint64_t Offset = CUAbbrOffset;
DWARFAbbreviationDeclarationSet AbbrDecls;
if (!AbbrDecls.extract(*Data, &Offset))
return nullptr;
PrevAbbrOffsetPos =
AbbrDeclSets.insert(std::make_pair(CUAbbrOffset, std::move(AbbrDecls)))
.first;
return &PrevAbbrOffsetPos->second;
}
return nullptr;
}
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