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//===- StackSlots.cpp - Specialize LLVM code for target machine ---------===//
//
// 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 "llvm/CodeGen/StackSlots.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/MachineInstrInfo.h"
#include "llvm/Constant.h"
#include "llvm/Function.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Pass.h"
#include "llvm/CodeGen/MachineFunction.h"
class StackSlots : public FunctionPass {
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 runOnFunction(Function &F) {
const Type *PtrInt = PointerType::get(Type::IntTy);
unsigned Size = Target.DataLayout.getTypeSize(PtrInt);
MachineFunction &mcInfo = MachineFunction::get(&F);
Value *V = Constant::getNullValue(Type::IntTy);
mcInfo.allocateLocalVar(Target, V, 2*Size);
return true;
}
};
Pass *createStackSlotsPass(const TargetMachine &Target) {
return new StackSlots(Target);
}
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