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21ee082d38
We were using a std::vector<> and resizing to MaxRecordLength, which is ~64KB. We would then do this repeatedly often many times in a tight loop, which was causing measurable performance impact when linking PDBs. Patch by Alex Telishev Differential Revision: https://reviews.llvm.org/D36940 llvm-svn: 311375
61 lines
1.8 KiB
C++
61 lines
1.8 KiB
C++
//===- SymbolSerializer.cpp -----------------------------------------------===//
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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/SymbolSerializer.h"
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#include "llvm/ADT/ArrayRef.h"
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#include "llvm/DebugInfo/CodeView/SymbolRecord.h"
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#include "llvm/Support/Endian.h"
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#include "llvm/Support/Error.h"
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#include <cassert>
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#include <cstdint>
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#include <cstring>
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using namespace llvm;
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using namespace llvm::codeview;
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SymbolSerializer::SymbolSerializer(BumpPtrAllocator &Allocator,
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CodeViewContainer Container)
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: Storage(Allocator), Stream(RecordBuffer, support::little), Writer(Stream),
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Mapping(Writer, Container) {}
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Error SymbolSerializer::visitSymbolBegin(CVSymbol &Record) {
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assert(!CurrentSymbol.hasValue() && "Already in a symbol mapping!");
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Writer.setOffset(0);
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if (auto EC = writeRecordPrefix(Record.kind()))
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return EC;
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CurrentSymbol = Record.kind();
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if (auto EC = Mapping.visitSymbolBegin(Record))
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return EC;
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return Error::success();
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}
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Error SymbolSerializer::visitSymbolEnd(CVSymbol &Record) {
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assert(CurrentSymbol.hasValue() && "Not in a symbol mapping!");
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if (auto EC = Mapping.visitSymbolEnd(Record))
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return EC;
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uint32_t RecordEnd = Writer.getOffset();
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uint16_t Length = RecordEnd - 2;
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Writer.setOffset(0);
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if (auto EC = Writer.writeInteger(Length))
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return EC;
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uint8_t *StableStorage = Storage.Allocate<uint8_t>(RecordEnd);
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::memcpy(StableStorage, &RecordBuffer[0], RecordEnd);
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Record.RecordData = ArrayRef<uint8_t>(StableStorage, RecordEnd);
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CurrentSymbol.reset();
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return Error::success();
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}
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