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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();
}
Error DWARFAbbreviationDeclarationSet::extract(DataExtractor Data,
uint64_t *OffsetPtr) {
clear();
const uint64_t BeginOffset = *OffsetPtr;
Offset = BeginOffset;
DWARFAbbreviationDeclaration AbbrDecl;
uint32_t PrevAbbrCode = 0;
while (true) {
Expected<DWARFAbbreviationDeclaration::ExtractState> ES =
AbbrDecl.extract(Data, OffsetPtr);
if (!ES)
return ES.takeError();
if (*ES == DWARFAbbreviationDeclaration::ExtractState::Complete)
break;
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 Error::success();
}
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];
}
std::string DWARFAbbreviationDeclarationSet::getCodeRange() const {
// Create a sorted list of all abbrev codes.
std::vector<uint32_t> Codes;
Codes.reserve(Decls.size());
for (const auto &Decl : Decls)
Codes.push_back(Decl.getCode());
std::string Buffer;
raw_string_ostream Stream(Buffer);
// Each iteration through this loop represents a single contiguous range in
// the set of codes.
for (auto Current = Codes.begin(), End = Codes.end(); Current != End;) {
uint32_t RangeStart = *Current;
// Add the current range start.
Stream << *Current;
uint32_t RangeEnd = RangeStart;
// Find the end of the current range.
while (++Current != End && *Current == RangeEnd + 1)
++RangeEnd;
// If there is more than one value in the range, add the range end too.
if (RangeStart != RangeEnd)
Stream << "-" << RangeEnd;
// If there is at least one more range, add a separator.
if (Current != End)
Stream << ", ";
}
return Buffer;
}
DWARFDebugAbbrev::DWARFDebugAbbrev(DataExtractor Data)
: AbbrDeclSets(), PrevAbbrOffsetPos(AbbrDeclSets.end()), 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 (Error Err = AbbrDecls.extract(*Data, &Offset)) {
// FIXME: We should propagate the error upwards.
consumeError(std::move(Err));
break;
}
AbbrDeclSets.insert(I, std::make_pair(CUAbbrOffset, std::move(AbbrDecls)));
}
Data = std::nullopt;
}
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);
}
}
Expected<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())
return make_error<llvm::object::GenericBinaryError>(
"the abbreviation offset into the .debug_abbrev section is not valid");
uint64_t Offset = CUAbbrOffset;
DWARFAbbreviationDeclarationSet AbbrDecls;
if (Error Err = AbbrDecls.extract(*Data, &Offset))
return std::move(Err);
PrevAbbrOffsetPos =
AbbrDeclSets.insert(std::make_pair(CUAbbrOffset, std::move(AbbrDecls)))
.first;
return &PrevAbbrOffsetPos->second;
}
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