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Type records have a unique type index, but symbol records do not. Instead, symbol records refer to other symbol records by referencing their offset in the symbol stream. In a sense this is the analogue of the TypeIndex, but we are not printing it in the dumper. Printing it not only gives us more useful information when manually investigating the contents of a PDB, but also allows us to write better tests by enabling us to verify that fields that reference other symbol records do so correctly. Differential Revision: https://reviews.llvm.org/D34906 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@306890 91177308-0d34-0410-b5e6-96231b3b80d8
95 lines
3.2 KiB
C++
95 lines
3.2 KiB
C++
//===- SymbolDeserializer.h -------------------------------------*- 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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#ifndef LLVM_DEBUGINFO_CODEVIEW_SYMBOLDESERIALIZER_H
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#define LLVM_DEBUGINFO_CODEVIEW_SYMBOLDESERIALIZER_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/DebugInfo/CodeView/SymbolRecordMapping.h"
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#include "llvm/DebugInfo/CodeView/SymbolVisitorCallbacks.h"
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#include "llvm/DebugInfo/CodeView/SymbolVisitorDelegate.h"
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#include "llvm/Support/BinaryByteStream.h"
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#include "llvm/Support/BinaryStreamReader.h"
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#include "llvm/Support/Error.h"
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namespace llvm {
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namespace codeview {
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class SymbolVisitorDelegate;
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class SymbolDeserializer : public SymbolVisitorCallbacks {
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struct MappingInfo {
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MappingInfo(ArrayRef<uint8_t> RecordData, CodeViewContainer Container)
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: Stream(RecordData, llvm::support::little), Reader(Stream),
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Mapping(Reader, Container) {}
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BinaryByteStream Stream;
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BinaryStreamReader Reader;
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SymbolRecordMapping Mapping;
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};
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public:
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template <typename T> static Error deserializeAs(CVSymbol Symbol, T &Record) {
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// If we're just deserializing one record, then don't worry about alignment
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// as there's nothing that comes after.
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SymbolDeserializer S(nullptr, CodeViewContainer::ObjectFile);
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if (auto EC = S.visitSymbolBegin(Symbol))
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return EC;
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if (auto EC = S.visitKnownRecord(Symbol, Record))
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return EC;
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if (auto EC = S.visitSymbolEnd(Symbol))
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return EC;
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return Error::success();
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}
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explicit SymbolDeserializer(SymbolVisitorDelegate *Delegate,
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CodeViewContainer Container)
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: Delegate(Delegate), Container(Container) {}
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Error visitSymbolBegin(CVSymbol &Record, uint32_t Offset) override {
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return visitSymbolBegin(Record);
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}
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Error visitSymbolBegin(CVSymbol &Record) override {
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assert(!Mapping && "Already in a symbol mapping!");
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Mapping = llvm::make_unique<MappingInfo>(Record.content(), Container);
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return Mapping->Mapping.visitSymbolBegin(Record);
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}
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Error visitSymbolEnd(CVSymbol &Record) override {
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assert(Mapping && "Not in a symbol mapping!");
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auto EC = Mapping->Mapping.visitSymbolEnd(Record);
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Mapping.reset();
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return EC;
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}
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#define SYMBOL_RECORD(EnumName, EnumVal, Name) \
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Error visitKnownRecord(CVSymbol &CVR, Name &Record) override { \
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return visitKnownRecordImpl(CVR, Record); \
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}
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#define SYMBOL_RECORD_ALIAS(EnumName, EnumVal, Name, AliasName)
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#include "llvm/DebugInfo/CodeView/CodeViewSymbols.def"
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private:
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template <typename T> Error visitKnownRecordImpl(CVSymbol &CVR, T &Record) {
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Record.RecordOffset =
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Delegate ? Delegate->getRecordOffset(Mapping->Reader) : 0;
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if (auto EC = Mapping->Mapping.visitKnownRecord(CVR, Record))
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return EC;
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return Error::success();
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}
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SymbolVisitorDelegate *Delegate;
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CodeViewContainer Container;
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std::unique_ptr<MappingInfo> Mapping;
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};
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}
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}
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#endif
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