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//===-- ConstantWriter.cpp - Functions for writing constants --------------===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the routines for encoding constants to a bytecode
// stream.
//
//===----------------------------------------------------------------------===//
#include "WriterInternals.h"
#include "llvm/Constants.h"
#include "llvm/SymbolTable.h"
#include "llvm/DerivedTypes.h"
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<FunctionType>(T);
int Slot = Table.getSlot(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.getSlot(*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<ArrayType>(T);
int Slot = Table.getSlot(AT->getElementType());
assert(Slot != -1 && "Type used but not available!!");
output_vbr((unsigned)Slot, Out);
//std::cerr << "Type slot = " << Slot << " Type = " << T->getName() << endl;
output_vbr(AT->getNumElements(), Out);
break;
}
case Type::StructTyID: {
const StructType *ST = cast<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.getSlot(*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<PointerType>(T);
int Slot = Table.getSlot(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:
std::cerr << __FILE__ << ":" << __LINE__ << ": Don't know how to serialize"
<< " Type '" << T->getDescription() << "'\n";
break;
}
}
bool BytecodeWriter::outputConstant(const Constant *CPV) {
assert((CPV->getType()->isPrimitiveType() || !CPV->isNullValue()) &&
"Shouldn't output null constants!");
// We must check for a ConstantExpr before switching by type because
// a ConstantExpr can be of any type, and has no explicit value.
//
if (const ConstantExpr *CE = dyn_cast<ConstantExpr>(CPV)) {
// FIXME: Encoding of constant exprs could be much more compact!
assert(CE->getNumOperands() > 0 && "ConstantExpr with 0 operands");
output_vbr(CE->getNumOperands(), Out); // flags as an expr
output_vbr(CE->getOpcode(), Out); // flags as an expr
for (User::const_op_iterator OI = CE->op_begin(); OI != CE->op_end(); ++OI){
int Slot = Table.getSlot(*OI);
assert(Slot != -1 && "Unknown constant used in ConstantExpr!!");
output_vbr((unsigned)Slot, Out);
Slot = Table.getSlot((*OI)->getType());
output_vbr((unsigned)Slot, Out);
}
return false;
} else {
output_vbr((unsigned)0, Out); // flag as not a ConstantExpr
}
switch (CPV->getType()->getPrimitiveID()) {
case Type::BoolTyID: // Boolean Types
if (cast<ConstantBool>(CPV)->getValue())
output_vbr(1U, Out);
else
output_vbr(0U, Out);
break;
case Type::UByteTyID: // Unsigned integer types...
case Type::UShortTyID:
case Type::UIntTyID:
case Type::ULongTyID:
output_vbr(cast<ConstantUInt>(CPV)->getValue(), Out);
break;
case Type::SByteTyID: // Signed integer types...
case Type::ShortTyID:
case Type::IntTyID:
case Type::LongTyID:
output_vbr(cast<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<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.getSlot(CPA->getOperand(i));
assert(Slot != -1 && "Constant used but not available!!");
output_vbr((unsigned)Slot, Out);
}
break;
}
case Type::StructTyID: {
const ConstantStruct *CPS = cast<ConstantStruct>(CPV);
const std::vector<Use> &Vals = CPS->getValues();
for (unsigned i = 0; i < Vals.size(); ++i) {
int Slot = Table.getSlot(Vals[i]);
assert(Slot != -1 && "Constant used but not available!!");
output_vbr((unsigned)Slot, Out);
}
break;
}
case Type::PointerTyID: {
const ConstantPointer *CPP = cast<ConstantPointer>(CPV);
assert(!isa<ConstantPointerNull>(CPP) && "Null should be already emitted!");
const ConstantPointerRef *CPR = cast<ConstantPointerRef>(CPP);
int Slot = Table.getSlot((Value*)CPR->getValue());
assert(Slot != -1 && "Global used but not available!!");
output_vbr((unsigned)Slot, Out);
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:
std::cerr << __FILE__ << ":" << __LINE__ << ": Don't know how to serialize"
<< " type '" << CPV->getType()->getName() << "'\n";
break;
}
return false;
}
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