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//===- DebugStringTableSubsection.cpp - CodeView String Table -------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#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 = Strings.insert({S, StringSize});
// If a given string didn't exist in the string table, we want to increment
// the string table size.
if (P.second)
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 : Strings) {
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 Strings.size(); }
uint32_t DebugStringTableSubsection::getStringId(StringRef S) const {
auto Iter = Strings.find(S);
assert(Iter != Strings.end());
return Iter->second;
}
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