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