llvm-6502/lib/Target/SparcV9/SparcV9StackSlots.cpp
Chris Lattner b12914bfc0 'Pass' should now not be derived from by clients. Instead, they should derive
from ModulePass.  Instead of implementing Pass::run, then should implement
ModulePass::runOnModule.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16436 91177308-0d34-0410-b5e6-96231b3b80d8
2004-09-20 04:48:05 +00:00

53 lines
1.7 KiB
C++

//===- SparcV9StackSlots.cpp - Add empty stack slots to functions ---------===//
//
// 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 "SparcV9Internals.h"
#include "llvm/Constant.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Function.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "MachineFunctionInfo.h"
using 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<SparcV9FunctionInfo>()->allocateLocalVar(V, 2*Size);
return true;
}
};
}
FunctionPass *llvm::createStackSlotsPass(const TargetMachine &Target) {
return new StackSlots(Target);
}