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//===--- SerializationTest.cpp - Experimental Object Serialization --------===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by Ted Kremenek and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements prototype code for serialization of objects in clang.
// It is not intended yet for public use, but simply is a placeholder to
// experiment with new serialization features. Serialization will eventually
// be integrated as a proper component of the clang libraries.
//
//===----------------------------------------------------------------------===//
#include "ASTConsumers.h"
#include "clang/AST/AST.h"
#include "clang/AST/ASTConsumer.h"
#include "clang/AST/ASTContext.h"
#include "llvm/System/Path.h"
#include "llvm/Bitcode/BitstreamWriter.h"
#include <fstream>
#include <iostream>
using namespace clang;
using llvm::BitstreamWriter;
using std::cerr;
using std::cout;
using std::endl;
using std::flush;
namespace llvm {
template<typename T> struct IntrospectionTrait {
struct Flags {
enum { isPod = false, UniqueInstances = false, UniqueRefs = false };
};
template<typename Introspector>
struct Ops {
static inline void Introspect(T& X, Introspector& I) {
assert (false && "Introspect not implemented.");
}
};
};
}
namespace {
class SerializationTest : public ASTConsumer {
IdentifierTable* IdTable;
unsigned MainFileID;
public:
void Initialize(ASTContext& Context, unsigned mainFileID) {
IdTable = &Context.Idents;
MainFileID = mainFileID;
RunSerializationTest();
}
void RunSerializationTest();
bool WriteAll(llvm::sys::Path& Filename);
virtual void HandleTopLevelDecl(Decl *D) {}
};
class Writer {
std::vector<unsigned char> Buffer;
BitstreamWriter Stream;
std::ostream& Out;
public:
enum { IdentifierTableBID = 0x8 };
Writer(std::ostream& out) : Stream(Buffer), Out(out) {
Buffer.reserve(256*1024);
// Emit the file header.
Stream.Emit((unsigned)'B', 8);
Stream.Emit((unsigned)'C', 8);
Stream.Emit(0xC, 4);
Stream.Emit(0xF, 4);
Stream.Emit(0xE, 4);
Stream.Emit(0x0, 4);
}
~Writer() {
Out.write((char*)&Buffer.front(), Buffer.size());
Out.flush();
}
template <typename T> inline void operator()(T& x) {
llvm::IntrospectionTrait<T>::template Ops<Writer>::Introspect(x,*this);
}
template <typename T> inline void operator()(T& x, unsigned bits) {
llvm::IntrospectionTrait<T>::template Ops<Writer>::Introspect(x,bits,*this);
}
template <typename T> inline void operator()(const T& x) {
operator()(const_cast<T&>(x));
}
template <typename T> inline void operator()(const T& x, unsigned bits) {
operator()(const_cast<T&>(x),bits);
}
inline void operator()(bool X) { Stream.Emit(X,1); }
inline void operator()(unsigned X) { Stream.Emit(X,32); }
inline void operator()(unsigned X, unsigned bits, bool VBR=false) {
if (VBR) Stream.Emit(X,bits);
else Stream.Emit(X,bits);
}
inline BitstreamWriter& getStream() {
return Stream;
}
template <typename T> inline void EnterSubblock(unsigned CodeLen) {
Stream.EnterSubblock(8,CodeLen);
}
inline void ExitBlock() { Stream.ExitBlock(); }
};
} // end anonymous namespace
//===----------------------------------------------------------------------===//
// External Interface.
//===----------------------------------------------------------------------===//
ASTConsumer* clang::CreateSerializationTest() {
return new SerializationTest();
}
//===----------------------------------------------------------------------===//
// Serialization "Driver" code.
//===----------------------------------------------------------------------===//
void SerializationTest::RunSerializationTest() {
std::string ErrMsg;
llvm::sys::Path Filename = llvm::sys::Path::GetTemporaryDirectory(&ErrMsg);
if (Filename.isEmpty()) {
cerr << "Error: " << ErrMsg << "\n";
return;
}
Filename.appendComponent("test.cfe_bc");
if (Filename.makeUnique(true,&ErrMsg)) {
cerr << "Error: " << ErrMsg << "\n";
return;
}
if (!WriteAll(Filename))
return;
cout << "Wrote file: " << Filename.c_str() << "\n";
}
bool SerializationTest::WriteAll(llvm::sys::Path& Filename) {
std::ofstream Out(Filename.c_str());
if (!Out) {
cerr << "Error: Cannot open " << Filename.c_str() << "\n";
return false;
}
Writer W(Out);
W(*IdTable);
W.getStream().FlushToWord();
return true;
}
//===----------------------------------------------------------------------===//
// Serialization Methods.
//===----------------------------------------------------------------------===//
namespace llvm {
struct IntrospectionPrimitivesFlags {
enum { isPod = true, UniqueInstances = false, UniqueRefs = false };
};
template<> struct
IntrospectionTrait<bool>::Flags : public IntrospectionPrimitivesFlags {};
template<> struct
IntrospectionTrait<unsigned>::Flags : public IntrospectionPrimitivesFlags {};
template<> struct
IntrospectionTrait<short>::Flags : public IntrospectionPrimitivesFlags {};
template<>
struct IntrospectionTrait<clang::IdentifierInfo> {
struct Flags {
enum { isPod = false, // Cannot copy via memcpy. Must use copy-ctor.
hasUniqueInstances = true, // Two pointers with different
// addreses point to objects
// that are not equal to each other.
hasUniqueReferences = true // Two (non-temporary) pointers
// will point to distinct instances.
};
};
template<typename Introspector>
struct Ops {
static void Introspect(clang::IdentifierInfo& X, Introspector& I) {
// I(X.getTokenID());
I(X.getBuiltinID(),9); // FIXME: do 9 bit specialization.
// I(X.getObjCKeywordID());
I(X.hasMacroDefinition());
I(X.isExtensionToken());
I(X.isPoisoned());
I(X.isOtherTargetMacro());
I(X.isCPlusPlusOperatorKeyword());
I(X.isNonPortableBuiltin());
}
};
};
template<> template<>
struct IntrospectionTrait<clang::IdentifierTable>::Ops<Writer> {
static void Introspect(clang::IdentifierTable& X, Writer& W) {
W.EnterSubblock<clang::IdentifierTable>(1);
/*
for (clang::IdentifierTable::iterator I = X.begin(), E = X.end();
I != E; ++I)
W(I->getValue());
*/
W.ExitBlock();
}
};
} // end namespace llvm
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