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//===- ReadConst.cpp - Code to constants and constant pools -----------------===
//
// This file implements functionality to deserialize constants and entire
// constant pools.
//
// Note that this library should be as fast as possible, reentrant, and
// threadsafe!!
//
//===------------------------------------------------------------------------===
#include "llvm/Module.h"
#include "llvm/BasicBlock.h"
#include "llvm/ConstPoolVals.h"
#include "llvm/DerivedTypes.h"
#include "ReaderInternals.h"
bool BytecodeParser::parseTypeConstant(const uchar *&Buf, const uchar *EndBuf,
ConstPoolVal *&V) {
const Type *Val = 0;
unsigned PrimType;
if (read_vbr(Buf, EndBuf, PrimType)) return true;
if ((Val = Type::getPrimitiveType((Type::PrimitiveID)PrimType))) {
V = new ConstPoolType(Val); // It's just a primitive ID.
return false;
}
switch (PrimType) {
case Type::MethodTyID: {
unsigned Typ;
if (read_vbr(Buf, EndBuf, Typ)) return true;
const Type *RetType = getType(Typ);
if (RetType == 0) return true;
MethodType::ParamTypes Params;
if (read_vbr(Buf, EndBuf, Typ)) return true;
while (Typ) {
const Type *Ty = getType(Typ);
if (Ty == 0) return true;
Params.push_back(Ty);
if (read_vbr(Buf, EndBuf, Typ)) return true;
}
Val = MethodType::getMethodType(RetType, Params);
break;
}
case Type::ArrayTyID: {
unsigned ElTyp;
if (read_vbr(Buf, EndBuf, ElTyp)) return true;
const Type *ElementType = getType(ElTyp);
if (ElementType == 0) return true;
int NumElements;
if (read_vbr(Buf, EndBuf, NumElements)) return true;
Val = ArrayType::getArrayType(ElementType, NumElements);
break;
}
case Type::StructTyID: {
unsigned Typ;
StructType::ElementTypes Elements;
if (read_vbr(Buf, EndBuf, Typ)) return true;
while (Typ) { // List is terminated by void/0 typeid
const Type *Ty = getType(Typ);
if (Ty == 0) return true;
Elements.push_back(Ty);
if (read_vbr(Buf, EndBuf, Typ)) return true;
}
Val = StructType::getStructType(Elements);
break;
}
case Type::PointerTyID: {
unsigned ElTyp;
if (read_vbr(Buf, EndBuf, ElTyp)) return true;
const Type *ElementType = getType(ElTyp);
if (ElementType == 0) return true;
Val = PointerType::getPointerType(ElementType);
break;
}
default:
cerr << __FILE__ << ":" << __LINE__ << ": Don't know how to deserialize"
<< " primitive Type " << PrimType << "\n";
return true;
}
V = new ConstPoolType(Val);
return false;
}
bool BytecodeParser::parseConstPoolValue(const uchar *&Buf,
const uchar *EndBuf,
const Type *Ty, ConstPoolVal *&V) {
switch (Ty->getPrimitiveID()) {
case Type::BoolTyID: {
unsigned Val;
if (read_vbr(Buf, EndBuf, Val)) return true;
if (Val != 0 && Val != 1) return true;
V = new ConstPoolBool(Val == 1);
break;
}
case Type::UByteTyID: // Unsigned integer types...
case Type::UShortTyID:
case Type::UIntTyID: {
unsigned Val;
if (read_vbr(Buf, EndBuf, Val)) return true;
if (!ConstPoolUInt::isValueValidForType(Ty, Val)) return true;
V = new ConstPoolUInt(Ty, Val);
break;
}
case Type::ULongTyID: {
uint64_t Val;
if (read_vbr(Buf, EndBuf, Val)) return true;
V = new ConstPoolUInt(Ty, Val);
break;
}
case Type::SByteTyID: // Unsigned integer types...
case Type::ShortTyID:
case Type::IntTyID: {
int Val;
if (read_vbr(Buf, EndBuf, Val)) return true;
if (!ConstPoolSInt::isValueValidForType(Ty, Val)) return 0;
V = new ConstPoolSInt(Ty, Val);
break;
}
case Type::LongTyID: {
int64_t Val;
if (read_vbr(Buf, EndBuf, Val)) return true;
V = new ConstPoolSInt(Ty, Val);
break;
}
case Type::TypeTyID:
if (parseTypeConstant(Buf, EndBuf, V)) return true;
break;
case Type::ArrayTyID: {
const ArrayType *AT = (const ArrayType*)Ty;
unsigned NumElements;
if (AT->isSized()) // Sized array, # elements stored in type!
NumElements = (unsigned)AT->getNumElements();
else // Unsized array, # elements stored in stream!
if (read_vbr(Buf, EndBuf, NumElements)) return true;
vector<ConstPoolVal *> Elements;
while (NumElements--) { // Read all of the elements of the constant.
unsigned Slot;
if (read_vbr(Buf, EndBuf, Slot)) return true;
Value *V = getValue(AT->getElementType(), Slot, false);
if (!V || V->getValueType() != Value::ConstantVal)
return true;
Elements.push_back((ConstPoolVal*)V);
}
V = new ConstPoolArray(AT, Elements);
break;
}
case Type::StructTyID: {
const StructType *ST = (const StructType*)Ty;
const StructType::ElementTypes &ET = ST->getElementTypes();
vector<ConstPoolVal *> Elements;
for (unsigned i = 0; i < ET.size(); ++i) {
unsigned Slot;
if (read_vbr(Buf, EndBuf, Slot)) return true;
Value *V = getValue(ET[i], Slot, false);
if (!V || V->getValueType() != Value::ConstantVal)
return true;
Elements.push_back((ConstPoolVal*)V);
}
V = new ConstPoolStruct(ST, Elements);
break;
}
default:
cerr << __FILE__ << ":" << __LINE__
<< ": Don't know how to deserialize constant value of type '"
<< Ty->getName() << "'\n";
return true;
}
return false;
}
bool BytecodeParser::ParseConstantPool(const uchar *&Buf, const uchar *EndBuf,
SymTabValue::ConstantPoolType &CP,
ValueTable &Tab) {
while (Buf < EndBuf) {
unsigned NumEntries, Typ;
if (read_vbr(Buf, EndBuf, NumEntries) ||
read_vbr(Buf, EndBuf, Typ)) return true;
const Type *Ty = getType(Typ);
if (Ty == 0) return true;
for (unsigned i = 0; i < NumEntries; i++) {
ConstPoolVal *I;
if (parseConstPoolValue(Buf, EndBuf, Ty, I)) return true;
#if 0
cerr << " Read const value: <" << I->getType()->getName()
<< ">: " << I->getStrValue() << endl;
#endif
insertValue(I, Tab);
CP.insert(I);
}
}
return Buf > EndBuf;
}
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