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4947d059e2
The `CVType` had two redundant fields which were confusing and error-prone to fill out. By treating member records as a distinct type from leaf records, we are able to simplify this quite a bit. Reviewed By: rnk Differential Revision: https://reviews.llvm.org/D24432 llvm-svn: 281556
106 lines
4.1 KiB
C++
106 lines
4.1 KiB
C++
//===- CVSymbolVisitor.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_CVSYMBOLVISITOR_H
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#define LLVM_DEBUGINFO_CODEVIEW_CVSYMBOLVISITOR_H
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#include "llvm/DebugInfo/CodeView/CVRecord.h"
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#include "llvm/DebugInfo/CodeView/CodeView.h"
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#include "llvm/DebugInfo/CodeView/SymbolRecord.h"
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#include "llvm/DebugInfo/CodeView/SymbolVisitorDelegate.h"
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#include "llvm/Support/ErrorOr.h"
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namespace llvm {
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namespace codeview {
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template <typename Derived> class CVSymbolVisitor {
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public:
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CVSymbolVisitor(SymbolVisitorDelegate *Delegate) : Delegate(Delegate) {}
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bool hadError() const { return HadError; }
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template <typename T>
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bool consumeObject(ArrayRef<uint8_t> &Data, const T *&Res) {
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if (Data.size() < sizeof(*Res)) {
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HadError = true;
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return false;
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}
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Res = reinterpret_cast<const T *>(Data.data());
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Data = Data.drop_front(sizeof(*Res));
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return true;
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}
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/// Actions to take on known symbols. By default, they do nothing. Visit methods
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/// for member records take the FieldData by non-const reference and are
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/// expected to consume the trailing bytes used by the field.
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/// FIXME: Make the visitor interpret the trailing bytes so that clients don't
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/// need to.
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#define SYMBOL_RECORD(EnumName, EnumVal, Name) \
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void visit##Name(SymbolRecordKind Kind, Name &Record) {}
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#define SYMBOL_RECORD_ALIAS(EnumName, EnumVal, Name, AliasName)
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#include "CVSymbolTypes.def"
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void visitSymbolRecord(const CVRecord<SymbolKind> &Record) {
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ArrayRef<uint8_t> Data = Record.content();
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auto *DerivedThis = static_cast<Derived *>(this);
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DerivedThis->visitSymbolBegin(Record.Type, Data);
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uint32_t RecordOffset = Delegate ? Delegate->getRecordOffset(Data) : 0;
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switch (Record.Type) {
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default:
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DerivedThis->visitUnknownSymbol(Record.Type, Data);
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break;
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#define SYMBOL_RECORD(EnumName, EnumVal, Name) \
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case EnumName: { \
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SymbolRecordKind RK = static_cast<SymbolRecordKind>(EnumName); \
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auto ExpectedResult = Name::deserialize(RK, RecordOffset, Data); \
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if (!ExpectedResult) { \
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consumeError(ExpectedResult.takeError()); \
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return parseError(); \
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} \
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DerivedThis->visit##Name(Record.Type, *ExpectedResult); \
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break; \
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}
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#define SYMBOL_RECORD_ALIAS(EnumName, EnumVal, Name, AliasName) \
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SYMBOL_RECORD(EnumVal, EnumVal, AliasName)
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#include "CVSymbolTypes.def"
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}
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DerivedThis->visitSymbolEnd(Record.Type, Record.content());
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}
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/// Visits the symbol records in Data. Sets the error flag on parse failures.
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void visitSymbolStream(const CVSymbolArray &Symbols) {
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for (const auto &I : Symbols) {
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visitSymbolRecord(I);
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if (hadError())
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break;
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}
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}
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/// Action to take on unknown symbols. By default, they are ignored.
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void visitUnknownSymbol(SymbolKind Kind, ArrayRef<uint8_t> Data) {}
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/// Paired begin/end actions for all symbols. Receives all record data,
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/// including the fixed-length record prefix.
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void visitSymbolBegin(SymbolKind Leaf, ArrayRef<uint8_t> RecordData) {}
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void visitSymbolEnd(SymbolKind Leaf, ArrayRef<uint8_t> OriginalSymData) {}
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/// Helper for returning from a void function when the stream is corrupted.
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void parseError() { HadError = true; }
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private:
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SymbolVisitorDelegate *Delegate;
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/// Whether a symbol stream parsing error was encountered.
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bool HadError = false;
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};
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} // end namespace codeview
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} // end namespace llvm
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#endif // LLVM_DEBUGINFO_CODEVIEW_CVSYMBOLVISITOR_H
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