#include "llvm/Constants.h"
#include "llvm/Pass.h"
#include "llvm/Target/TargetData.h"
-#include "Support/StatisticReporter.h"
+#include "Support/Statistic.h"
-static Statistic<> NumLowered("lowerallocs\t- Number of allocations lowered");
using std::vector;
namespace {
+ Statistic<> NumLowered("lowerallocs", "Number of allocations lowered");
+
+ /// LowerAllocations - Turn malloc and free instructions into %malloc and
+ /// %free calls.
+ ///
+ class LowerAllocations : public BasicBlockPass {
+ Function *MallocFunc; // Functions in the module we are processing
+ Function *FreeFunc; // Initialized by doInitialization
+ public:
+ LowerAllocations() : MallocFunc(0), FreeFunc(0) {}
+
+ virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+ AU.addRequired<TargetData>();
+ }
-// LowerAllocations - Turn malloc and free instructions into %malloc and %free
-// calls.
-//
-class LowerAllocations : public BasicBlockPass {
- Function *MallocFunc; // Functions in the module we are processing
- Function *FreeFunc; // Initialized by doInitialization
-
- const TargetData &DataLayout;
-public:
- LowerAllocations(const TargetData &TD) : DataLayout(TD) {
- MallocFunc = FreeFunc = 0;
- }
-
- // doPassInitialization - For the lower allocations pass, this ensures that a
- // module contains a declaration for a malloc and a free function.
- //
- bool doInitialization(Module &M);
-
- // runOnBasicBlock - This method does the actual work of converting
- // instructions over, assuming that the pass has already been initialized.
- //
- bool runOnBasicBlock(BasicBlock &BB);
-};
+ /// doPassInitialization - For the lower allocations pass, this ensures that
+ /// a module contains a declaration for a malloc and a free function.
+ ///
+ bool doInitialization(Module &M);
+
+ /// runOnBasicBlock - This method does the actual work of converting
+ /// instructions over, assuming that the pass has already been initialized.
+ ///
+ bool runOnBasicBlock(BasicBlock &BB);
+ };
+
+ RegisterOpt<LowerAllocations>
+ X("lowerallocs", "Lower allocations from instructions to calls");
}
// createLowerAllocationsPass - Interface to this file...
-Pass *createLowerAllocationsPass(const TargetData &TD) {
- return new LowerAllocations(TD);
+Pass *createLowerAllocationsPass() {
+ return new LowerAllocations();
}
-static RegisterOpt<LowerAllocations>
-X("lowerallocs", "Lower allocations from instructions to calls (TD)",
- createLowerAllocationsPass);
-
// doInitialization - For the lower allocations pass, this ensures that a
// module contains a declaration for a malloc and a free function.
assert(MallocFunc && FreeFunc && "Pass not initialized!");
BasicBlock::InstListType &BBIL = BB.getInstList();
+ TargetData &DataLayout = getAnalysis<TargetData>();
// Loop over all of the instructions, looking for malloc or free instructions
for (BasicBlock::iterator I = BB.begin(), E = BB.end(); I != E; ++I) {
if (MallocInst *MI = dyn_cast<MallocInst>(&*I)) {
- BBIL.remove(I); // remove the malloc instr...
-
const Type *AllocTy = MI->getType()->getElementType();
// Get the number of bytes to be allocated for one element of the
MallocArg = MI->getOperand(0); // Operand * 1 = Operand
} else if (MI->getNumOperands()) {
// Multiply it by the array size if neccesary...
- MallocArg = BinaryOperator::create(Instruction::Mul,MI->getOperand(0),
- MallocArg);
- I = ++BBIL.insert(I, cast<Instruction>(MallocArg));
+ MallocArg = BinaryOperator::create(Instruction::Mul, MI->getOperand(0),
+ MallocArg, "", I);
}
// Create the call to Malloc...
CallInst *MCall = new CallInst(MallocFunc,
- vector<Value*>(1, MallocArg));
- I = BBIL.insert(I, MCall);
+ vector<Value*>(1, MallocArg), "", I);
// Create a cast instruction to convert to the right type...
- CastInst *MCast = new CastInst(MCall, MI->getType());
- I = BBIL.insert(++I, MCast);
+ CastInst *MCast = new CastInst(MCall, MI->getType(), "", I);
// Replace all uses of the old malloc inst with the cast inst
MI->replaceAllUsesWith(MCast);
- delete MI; // Delete the malloc inst
+ I = --BBIL.erase(I); // remove and delete the malloc instr...
Changed = true;
++NumLowered;
} else if (FreeInst *FI = dyn_cast<FreeInst>(&*I)) {
- BBIL.remove(I);
-
// Cast the argument to free into a ubyte*...
CastInst *MCast = new CastInst(FI->getOperand(0),
- PointerType::get(Type::UByteTy));
- I = ++BBIL.insert(I, MCast);
+ PointerType::get(Type::UByteTy), "", I);
// Insert a call to the free function...
- CallInst *FCall = new CallInst(FreeFunc, vector<Value*>(1, MCast));
- I = BBIL.insert(I, FCall);
+ CallInst *FCall = new CallInst(FreeFunc, vector<Value*>(1, MCast), "", I);
// Delete the old free instruction
- delete FI;
+ I = --BBIL.erase(I);
Changed = true;
++NumLowered;
}