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//===- DebugStringTableSubsection.cpp - CodeView String Table -------------===//
//
// 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/CodeView/DebugStringTableSubsection.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/DebugInfo/CodeView/CodeView.h"
#include "llvm/Support/BinaryStreamReader.h"
#include "llvm/Support/BinaryStreamWriter.h"
#include "llvm/Support/Error.h"
#include <algorithm>
#include <cassert>
#include <cstdint>
using namespace llvm;
using namespace llvm::codeview;
DebugStringTableSubsectionRef::DebugStringTableSubsectionRef()
: DebugSubsectionRef(DebugSubsectionKind::StringTable) {}
Error DebugStringTableSubsectionRef::initialize(BinaryStreamRef Contents) {
Stream = Contents;
return Error::success();
}
Error DebugStringTableSubsectionRef::initialize(BinaryStreamReader &Reader) {
return Reader.readStreamRef(Stream);
}
Expected<StringRef>
DebugStringTableSubsectionRef::getString(uint32_t Offset) const {
BinaryStreamReader Reader(Stream);
Reader.setOffset(Offset);
StringRef Result;
if (auto EC = Reader.readCString(Result))
return std::move(EC);
return Result;
}
DebugStringTableSubsection::DebugStringTableSubsection()
: DebugSubsection(DebugSubsectionKind::StringTable) {}
uint32_t DebugStringTableSubsection::insert(StringRef S) {
auto P = StringToId.insert({S, StringSize});
// If a given string didn't exist in the string table, we want to increment
// the string table size and insert it into the reverse lookup.
if (P.second) {
IdToString.insert({P.first->getValue(), P.first->getKey()});
StringSize += S.size() + 1; // +1 for '\0'
}
return P.first->second;
}
uint32_t DebugStringTableSubsection::calculateSerializedSize() const {
return StringSize;
}
Error DebugStringTableSubsection::commit(BinaryStreamWriter &Writer) const {
uint32_t Begin = Writer.getOffset();
uint32_t End = Begin + StringSize;
// Write a null string at the beginning.
if (auto EC = Writer.writeCString(StringRef()))
return EC;
for (auto &Pair : StringToId) {
StringRef S = Pair.getKey();
uint32_t Offset = Begin + Pair.getValue();
Writer.setOffset(Offset);
if (auto EC = Writer.writeCString(S))
return EC;
assert(Writer.getOffset() <= End);
}
Writer.setOffset(End);
assert((End - Begin) == StringSize);
return Error::success();
}
uint32_t DebugStringTableSubsection::size() const { return StringToId.size(); }
std::vector<uint32_t> DebugStringTableSubsection::sortedIds() const {
std::vector<uint32_t> Result;
Result.reserve(IdToString.size());
for (const auto &Entry : IdToString)
Result.push_back(Entry.first);
llvm::sort(Result);
return Result;
}
uint32_t DebugStringTableSubsection::getIdForString(StringRef S) const {
auto Iter = StringToId.find(S);
assert(Iter != StringToId.end());
return Iter->second;
}
StringRef DebugStringTableSubsection::getStringForId(uint32_t Id) const {
auto Iter = IdToString.find(Id);
assert(Iter != IdToString.end());
return Iter->second;
}
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