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288180ac40
Previously we had knowledge of how to serialize and deserialize a string table inside of DebugInfo/PDB, but the string table that it serializes contains a piece that is actually considered CodeView and can appear outside of a PDB. We already have logic in llvm-readobj and MCCodeView to read and write this format, so it doesn't make sense to duplicate the logic in DebugInfoPDB as well. This patch makes codeview::StringTable (for writing) and codeview::StringTableRef (for reading), updates DebugInfoPDB to use these classes for its own writing, and updates llvm-readobj to additionally use StringTableRef for reading. It's a bit more difficult to get MCCodeView to use this for writing, but it's a logical next step. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@301986 91177308-0d34-0410-b5e6-96231b3b80d8
66 lines
1.9 KiB
C++
66 lines
1.9 KiB
C++
//===- StringTable.cpp - CodeView String Table Reader/Writer ----*- C++ -*-===//
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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/StringTable.h"
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#include "llvm/Support/BinaryStream.h"
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#include "llvm/Support/BinaryStreamReader.h"
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#include "llvm/Support/BinaryStreamWriter.h"
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using namespace llvm;
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using namespace llvm::codeview;
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StringTableRef::StringTableRef() {}
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Error StringTableRef::initialize(BinaryStreamReader &Reader) {
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return Reader.readStreamRef(Stream, Reader.bytesRemaining());
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}
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StringRef StringTableRef::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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Error EC = Reader.readCString(Result);
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assert(!EC);
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consumeError(std::move(EC));
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return Result;
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}
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uint32_t StringTable::insert(StringRef S) {
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auto P = Strings.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.
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if (P.second)
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StringSize += S.size() + 1; // +1 for '\0'
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return P.first->second;
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}
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uint32_t StringTable::calculateSerializedSize() const { return StringSize; }
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Error StringTable::commit(BinaryStreamWriter &Writer) const {
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assert(Writer.bytesRemaining() == StringSize);
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uint32_t MaxOffset = 1;
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for (auto &Pair : Strings) {
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StringRef S = Pair.getKey();
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uint32_t Offset = 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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MaxOffset = std::max(MaxOffset, Offset + S.size() + 1);
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}
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Writer.setOffset(MaxOffset);
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assert(Writer.bytesRemaining() == 0);
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return Error::success();
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}
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uint32_t StringTable::size() const { return Strings.size(); }
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