llvm-6502/lib/Target/SparcV9/SparcV9StackSlots.cpp

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//===- StackSlots.cpp - Specialize LLVM code for target machine ----------===//
//
// 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 pass adds 2 empty slots at the top of function stack. These two slots
// are later used during code reoptimization for spilling the register values
// when rewriting branches.
//
//===----------------------------------------------------------------------===//
#include "SparcInternals.h"
#include "llvm/Constant.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Function.h"
#include "llvm/CodeGen/MachineFunctionInfo.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
namespace llvm {
namespace {
class StackSlots : public MachineFunctionPass {
const TargetMachine &Target;
public:
StackSlots(const TargetMachine &T) : Target(T) {}
const char *getPassName() const {
return "Stack Slot Insertion for profiling code";
}
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.setPreservesCFG();
}
bool runOnMachineFunction(MachineFunction &MF) {
const Type *PtrInt = PointerType::get(Type::IntTy);
unsigned Size = Target.getTargetData().getTypeSize(PtrInt);
Value *V = Constant::getNullValue(Type::IntTy);
MF.getInfo()->allocateLocalVar(V, 2*Size);
return true;
}
};
}
Pass *createStackSlotsPass(const TargetMachine &Target) {
return new StackSlots(Target);
}
} // End llvm namespace