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42 lines
1.1 KiB
C++
42 lines
1.1 KiB
C++
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//===- StackSlots.cpp - Specialize LLVM code for target machine ---------===//
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//
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// This pass adds 2 empty slots at the top of function stack.
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// These two slots are later used during code reoptimization
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// for spilling the resgiter values when rewriting branches.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/MachineInstrInfo.h"
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#include "llvm/Constants.h"
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#include "llvm/Function.h"
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#include "llvm/DerivedTypes.h"
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#include "llvm/Pass.h"
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#include "llvm/CodeGen/MachineCodeForMethod.h"
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using std::map;
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using std::cerr;
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class StackSlots : public FunctionPass{
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private:
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const TargetMachine ⌖
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public:
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StackSlots (const TargetMachine &T): target(T) {}
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bool runOnFunction(Function &F) {
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Value *v = ConstantSInt::get(Type::IntTy,0);
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MachineCodeForMethod &mcInfo = MachineCodeForMethod::get(&F);
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mcInfo.allocateLocalVar
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(target, v, 2*target.DataLayout.getTypeSize(PointerType::get(Type::IntTy)));
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return true;
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}
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};
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Pass* createStackSlotsPass(TargetMachine &T){
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return new StackSlots(T);
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}
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