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//===-- WriteConst.cpp - Functions for writing constants ---------*- C++ -*--=//
//
// This file implements the routines for encoding constants to a bytecode
// stream.
//
// Note that the performance of this library is not terribly important, because
// it shouldn't be used by JIT type applications... so it is not a huge focus
// at least. :)
//
//===----------------------------------------------------------------------===//
#include "WriterInternals.h"
#include "llvm/ConstantVals.h"
#include "llvm/SymbolTable.h"
#include "llvm/DerivedTypes.h"
#include <iostream>
using std::cerr;
void BytecodeWriter::outputType(const Type *T) {
output_vbr((unsigned)T->getPrimitiveID(), Out);
// That's all there is to handling primitive types...
if (T->isPrimitiveType())
return; // We might do this if we alias a prim type: %x = type int
switch (T->getPrimitiveID()) { // Handle derived types now.
case Type::FunctionTyID: {
const FunctionType *MT = cast<const FunctionType>(T);
int Slot = Table.getValSlot(MT->getReturnType());
assert(Slot != -1 && "Type used but not available!!");
output_vbr((unsigned)Slot, Out);
// Output the number of arguments to method (+1 if varargs):
output_vbr(MT->getParamTypes().size()+MT->isVarArg(), Out);
// Output all of the arguments...
FunctionType::ParamTypes::const_iterator I = MT->getParamTypes().begin();
for (; I != MT->getParamTypes().end(); ++I) {
Slot = Table.getValSlot(*I);
assert(Slot != -1 && "Type used but not available!!");
output_vbr((unsigned)Slot, Out);
}
// Terminate list with VoidTy if we are a varargs function...
if (MT->isVarArg())
output_vbr((unsigned)Type::VoidTy->getPrimitiveID(), Out);
break;
}
case Type::ArrayTyID: {
const ArrayType *AT = cast<const ArrayType>(T);
int Slot = Table.getValSlot(AT->getElementType());
assert(Slot != -1 && "Type used but not available!!");
output_vbr((unsigned)Slot, Out);
//cerr << "Type slot = " << Slot << " Type = " << T->getName() << endl;
output_vbr(AT->getNumElements(), Out);
break;
}
case Type::StructTyID: {
const StructType *ST = cast<const StructType>(T);
// Output all of the element types...
StructType::ElementTypes::const_iterator I = ST->getElementTypes().begin();
for (; I != ST->getElementTypes().end(); ++I) {
int Slot = Table.getValSlot(*I);
assert(Slot != -1 && "Type used but not available!!");
output_vbr((unsigned)Slot, Out);
}
// Terminate list with VoidTy
output_vbr((unsigned)Type::VoidTy->getPrimitiveID(), Out);
break;
}
case Type::PointerTyID: {
const PointerType *PT = cast<const PointerType>(T);
int Slot = Table.getValSlot(PT->getElementType());
assert(Slot != -1 && "Type used but not available!!");
output_vbr((unsigned)Slot, Out);
break;
}
case Type::OpaqueTyID: {
// No need to emit anything, just the count of opaque types is enough.
break;
}
//case Type::PackedTyID:
default:
cerr << __FILE__ << ":" << __LINE__ << ": Don't know how to serialize"
<< " Type '" << T->getDescription() << "'\n";
break;
}
}
bool BytecodeWriter::outputConstant(const Constant *CPV) {
switch (CPV->getType()->getPrimitiveID()) {
case Type::BoolTyID: // Boolean Types
if (cast<const ConstantBool>(CPV)->getValue())
output_vbr((unsigned)1, Out);
else
output_vbr((unsigned)0, Out);
break;
case Type::UByteTyID: // Unsigned integer types...
case Type::UShortTyID:
case Type::UIntTyID:
case Type::ULongTyID:
output_vbr(cast<const ConstantUInt>(CPV)->getValue(), Out);
break;
case Type::SByteTyID: // Signed integer types...
case Type::ShortTyID:
case Type::IntTyID:
case Type::LongTyID:
output_vbr(cast<const ConstantSInt>(CPV)->getValue(), Out);
break;
case Type::TypeTyID: // Serialize type type
assert(0 && "Types should not be in the Constant!");
break;
case Type::ArrayTyID: {
const ConstantArray *CPA = cast<const ConstantArray>(CPV);
unsigned size = CPA->getValues().size();
assert(size == cast<ArrayType>(CPA->getType())->getNumElements() && "ConstantArray out of whack!");
for (unsigned i = 0; i < size; i++) {
int Slot = Table.getValSlot(CPA->getOperand(i));
assert(Slot != -1 && "Constant used but not available!!");
output_vbr((unsigned)Slot, Out);
}
break;
}
case Type::StructTyID: {
const ConstantStruct *CPS = cast<const ConstantStruct>(CPV);
const std::vector<Use> &Vals = CPS->getValues();
for (unsigned i = 0; i < Vals.size(); ++i) {
int Slot = Table.getValSlot(Vals[i]);
assert(Slot != -1 && "Constant used but not available!!");
output_vbr((unsigned)Slot, Out);
}
break;
}
case Type::PointerTyID: {
const ConstantPointer *CPP = cast<const ConstantPointer>(CPV);
if (isa<ConstantPointerNull>(CPP)) {
output_vbr((unsigned)0, Out);
} else if (const ConstantPointerRef *CPR =
dyn_cast<ConstantPointerRef>(CPP)) {
output_vbr((unsigned)1, Out);
int Slot = Table.getValSlot((Value*)CPR->getValue());
assert(Slot != -1 && "Global used but not available!!");
output_vbr((unsigned)Slot, Out);
} else {
assert(0 && "Unknown ConstantPointer Subclass!");
}
break;
}
case Type::FloatTyID: { // Floating point types...
float Tmp = (float)cast<ConstantFP>(CPV)->getValue();
output_data(&Tmp, &Tmp+1, Out);
break;
}
case Type::DoubleTyID: {
double Tmp = cast<ConstantFP>(CPV)->getValue();
output_data(&Tmp, &Tmp+1, Out);
break;
}
case Type::VoidTyID:
case Type::LabelTyID:
default:
cerr << __FILE__ << ":" << __LINE__ << ": Don't know how to serialize"
<< " type '" << CPV->getType()->getName() << "'\n";
break;
}
return false;
}
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