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//===- CVTypeVisitor.cpp ----------------------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "llvm/DebugInfo/CodeView/CVTypeVisitor.h"
#include "llvm/DebugInfo/CodeView/CodeViewError.h"
#include "llvm/DebugInfo/CodeView/TypeDatabase.h"
#include "llvm/DebugInfo/CodeView/TypeDatabaseVisitor.h"
#include "llvm/DebugInfo/CodeView/TypeDeserializer.h"
#include "llvm/DebugInfo/CodeView/TypeRecordMapping.h"
#include "llvm/DebugInfo/CodeView/TypeServerHandler.h"
#include "llvm/DebugInfo/CodeView/TypeVisitorCallbackPipeline.h"
#include "llvm/Support/BinaryByteStream.h"
#include "llvm/Support/BinaryStreamReader.h"
using namespace llvm;
using namespace llvm::codeview;
CVTypeVisitor::CVTypeVisitor(TypeVisitorCallbacks &Callbacks)
: Callbacks(Callbacks) {}
template <typename T>
static Error visitKnownRecord(CVType &Record, TypeVisitorCallbacks &Callbacks) {
TypeRecordKind RK = static_cast<TypeRecordKind>(Record.Type);
T KnownRecord(RK);
if (auto EC = Callbacks.visitKnownRecord(Record, KnownRecord))
return EC;
return Error::success();
}
template <typename T>
static Error visitKnownMember(CVMemberRecord &Record,
TypeVisitorCallbacks &Callbacks) {
TypeRecordKind RK = static_cast<TypeRecordKind>(Record.Kind);
T KnownRecord(RK);
if (auto EC = Callbacks.visitKnownMember(Record, KnownRecord))
return EC;
return Error::success();
}
static Expected<TypeServer2Record> deserializeTypeServerRecord(CVType &Record) {
class StealTypeServerVisitor : public TypeVisitorCallbacks {
public:
explicit StealTypeServerVisitor(TypeServer2Record &TR) : TR(TR) {}
Error visitKnownRecord(CVType &CVR, TypeServer2Record &Record) override {
TR = Record;
return Error::success();
}
private:
TypeServer2Record &TR;
};
TypeServer2Record R(TypeRecordKind::TypeServer2);
TypeDeserializer Deserializer;
StealTypeServerVisitor Thief(R);
TypeVisitorCallbackPipeline Pipeline;
Pipeline.addCallbackToPipeline(Deserializer);
Pipeline.addCallbackToPipeline(Thief);
CVTypeVisitor Visitor(Pipeline);
if (auto EC = Visitor.visitTypeRecord(Record))
return std::move(EC);
return R;
}
void CVTypeVisitor::addTypeServerHandler(TypeServerHandler &Handler) {
Handlers.push_back(&Handler);
}
Expected<bool> CVTypeVisitor::handleTypeServer(CVType &Record) {
if (Record.Type == TypeLeafKind::LF_TYPESERVER2 && !Handlers.empty()) {
auto TS = deserializeTypeServerRecord(Record);
if (!TS)
return TS.takeError();
for (auto Handler : Handlers) {
auto ExpectedResult = Handler->handle(*TS, Callbacks);
// If there was an error, return the error.
if (!ExpectedResult)
return ExpectedResult.takeError();
// If the handler processed the record, return success.
if (*ExpectedResult)
return true;
// Otherwise keep searching for a handler, eventually falling out and
// using the default record handler.
}
}
return false;
}
Error CVTypeVisitor::finishVisitation(CVType &Record) {
switch (Record.Type) {
default:
if (auto EC = Callbacks.visitUnknownType(Record))
return EC;
break;
#define TYPE_RECORD(EnumName, EnumVal, Name) \
case EnumName: { \
if (auto EC = visitKnownRecord<Name##Record>(Record, Callbacks)) \
return EC; \
break; \
}
#define TYPE_RECORD_ALIAS(EnumName, EnumVal, Name, AliasName) \
TYPE_RECORD(EnumVal, EnumVal, AliasName)
#define MEMBER_RECORD(EnumName, EnumVal, Name)
#define MEMBER_RECORD_ALIAS(EnumName, EnumVal, Name, AliasName)
#include "llvm/DebugInfo/CodeView/TypeRecords.def"
}
if (auto EC = Callbacks.visitTypeEnd(Record))
return EC;
return Error::success();
}
Error CVTypeVisitor::visitTypeRecord(CVType &Record, TypeIndex Index) {
auto ExpectedResult = handleTypeServer(Record);
if (!ExpectedResult)
return ExpectedResult.takeError();
if (*ExpectedResult)
return Error::success();
if (auto EC = Callbacks.visitTypeBegin(Record, Index))
return EC;
return finishVisitation(Record);
}
Error CVTypeVisitor::visitTypeRecord(CVType &Record) {
auto ExpectedResult = handleTypeServer(Record);
if (!ExpectedResult)
return ExpectedResult.takeError();
if (*ExpectedResult)
return Error::success();
if (auto EC = Callbacks.visitTypeBegin(Record))
return EC;
return finishVisitation(Record);
}
static Error visitMemberRecord(CVMemberRecord &Record,
TypeVisitorCallbacks &Callbacks) {
if (auto EC = Callbacks.visitMemberBegin(Record))
return EC;
switch (Record.Kind) {
default:
if (auto EC = Callbacks.visitUnknownMember(Record))
return EC;
break;
#define MEMBER_RECORD(EnumName, EnumVal, Name) \
case EnumName: { \
if (auto EC = visitKnownMember<Name##Record>(Record, Callbacks)) \
return EC; \
break; \
}
#define MEMBER_RECORD_ALIAS(EnumName, EnumVal, Name, AliasName) \
MEMBER_RECORD(EnumVal, EnumVal, AliasName)
#define TYPE_RECORD(EnumName, EnumVal, Name)
#define TYPE_RECORD_ALIAS(EnumName, EnumVal, Name, AliasName)
#include "llvm/DebugInfo/CodeView/TypeRecords.def"
}
if (auto EC = Callbacks.visitMemberEnd(Record))
return EC;
return Error::success();
}
Error CVTypeVisitor::visitMemberRecord(CVMemberRecord &Record) {
return ::visitMemberRecord(Record, Callbacks);
}
/// Visits the type records in Data. Sets the error flag on parse failures.
Error CVTypeVisitor::visitTypeStream(const CVTypeArray &Types) {
for (auto I : Types) {
if (auto EC = visitTypeRecord(I))
return EC;
}
return Error::success();
}
Error CVTypeVisitor::visitTypeStream(CVTypeRange Types) {
for (auto I : Types) {
if (auto EC = visitTypeRecord(I))
return EC;
}
return Error::success();
}
Error CVTypeVisitor::visitFieldListMemberStream(BinaryStreamReader Reader) {
FieldListDeserializer Deserializer(Reader);
TypeVisitorCallbackPipeline Pipeline;
Pipeline.addCallbackToPipeline(Deserializer);
Pipeline.addCallbackToPipeline(Callbacks);
TypeLeafKind Leaf;
while (!Reader.empty()) {
if (auto EC = Reader.readEnum(Leaf))
return EC;
CVMemberRecord Record;
Record.Kind = Leaf;
if (auto EC = ::visitMemberRecord(Record, Pipeline))
return EC;
}
return Error::success();
}
Error CVTypeVisitor::visitFieldListMemberStream(ArrayRef<uint8_t> Data) {
BinaryByteStream S(Data, llvm::support::little);
BinaryStreamReader SR(S);
return visitFieldListMemberStream(SR);
}
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