本文整理汇总了C++中ExtractValueInst::eraseFromParent方法的典型用法代码示例。如果您正苦于以下问题：C++ ExtractValueInst::eraseFromParent方法的具体用法？C++ ExtractValueInst::eraseFromParent怎么用？C++ ExtractValueInst::eraseFromParent使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类ExtractValueInst的用法示例。
在下文中一共展示了ExtractValueInst::eraseFromParent方法的2个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: substituteLPadValues
/// substituteLPadValues - Substitute the values returned by the landingpad
/// instruction with those returned by the personality function.
void SjLjEHPrepare::substituteLPadValues(LandingPadInst *LPI, Value *ExnVal,
Value *SelVal) {
SmallVector<Value *, 8> UseWorkList(LPI->user_begin(), LPI->user_end());
while (!UseWorkList.empty()) {
Value *Val = UseWorkList.pop_back_val();
ExtractValueInst *EVI = dyn_cast<ExtractValueInst>(Val);
if (!EVI)
continue;
if (EVI->getNumIndices() != 1)
continue;
if (*EVI->idx_begin() == 0)
EVI->replaceAllUsesWith(ExnVal);
else if (*EVI->idx_begin() == 1)
EVI->replaceAllUsesWith(SelVal);
if (EVI->getNumUses() == 0)
EVI->eraseFromParent();
}
if (LPI->getNumUses() == 0)
return;
// There are still some uses of LPI. Construct an aggregate with the exception
// values and replace the LPI with that aggregate.
Type *LPadType = LPI->getType();
Value *LPadVal = UndefValue::get(LPadType);
auto *SelI = cast<Instruction>(SelVal);
IRBuilder<> Builder(SelI->getParent(), std::next(SelI->getIterator()));
LPadVal = Builder.CreateInsertValue(LPadVal, ExnVal, 0, "lpad.val");
LPadVal = Builder.CreateInsertValue(LPadVal, SelVal, 1, "lpad.val");
LPI->replaceAllUsesWith(LPadVal);
}示例2: runOnModule
//
// Method: runOnModule()
//
// Description:
// Entry point for this LLVM pass. Search for insert/extractvalue instructions
// that can be simplified.
//
// Inputs:
// M - A reference to the LLVM module to transform.
//
// Outputs:
// M - The transformed LLVM module.
//
// Return value:
// true - The module was modified.
// false - The module was not modified.
//
bool SimplifyEV::runOnModule(Module& M) {
// Repeat till no change
bool changed;
do {
changed = false;
for (Module::iterator F = M.begin(); F != M.end(); ++F) {
for (Function::iterator B = F->begin(), FE = F->end(); B != FE; ++B) {
for (BasicBlock::iterator I = B->begin(), BE = B->end(); I != BE;) {
ExtractValueInst *EV = dyn_cast<ExtractValueInst>(I++);
if(!EV)
continue;
Value *Agg = EV->getAggregateOperand();
if (!EV->hasIndices()) {
EV->replaceAllUsesWith(Agg);
DEBUG(errs() << "EV:");
DEBUG(errs() << "ERASE:");
DEBUG(EV->dump());
EV->eraseFromParent();
numErased++;
changed = true;
continue;
}
if (Constant *C = dyn_cast<Constant>(Agg)) {
if (isa<UndefValue>(C)) {
EV->replaceAllUsesWith(UndefValue::get(EV->getType()));
DEBUG(errs() << "EV:");
DEBUG(errs() << "ERASE:");
DEBUG(EV->dump());
EV->eraseFromParent();
numErased++;
changed = true;
continue;
}
if (isa<ConstantAggregateZero>(C)) {
EV->replaceAllUsesWith(Constant::getNullValue(EV->getType()));
DEBUG(errs() << "EV:");
DEBUG(errs() << "ERASE:");
DEBUG(EV->dump());
EV->eraseFromParent();
numErased++;
changed = true;
continue;
}
if (isa<ConstantArray>(C) || isa<ConstantStruct>(C)) {
// Extract the element indexed by the first index out of the constant
Value *V = C->getOperand(*EV->idx_begin());
if (EV->getNumIndices() > 1) {
// Extract the remaining indices out of the constant indexed by the
// first index
ExtractValueInst *EV_new = ExtractValueInst::Create(V,
EV->getIndices().slice(1),
"", EV);
EV->replaceAllUsesWith(EV_new);
DEBUG(errs() << "EV:");
DEBUG(errs() << "ERASE:");
DEBUG(EV->dump());
EV->eraseFromParent();
numErased++;
changed = true;
continue;
} else {
EV->replaceAllUsesWith(V);
DEBUG(errs() << "EV:");
DEBUG(errs() << "ERASE:");
DEBUG(EV->dump());
EV->eraseFromParent();
numErased++;
changed = true;
continue;
}
}
continue;
}
if (LoadInst * LI = dyn_cast<LoadInst>(Agg)) {
// if the Agg value came from a load instruction
// replace the extract value intruction with
// a gep and a load.
SmallVector<Value*, 8> Indices;
Type *Int32Ty = Type::getInt32Ty(M.getContext());
Indices.push_back(Constant::getNullValue(Int32Ty));
for (ExtractValueInst::idx_iterator I = EV->idx_begin(), E = EV->idx_end();
I != E; ++I) {
Indices.push_back(ConstantInt::get(Int32Ty, *I));
//.........这里部分代码省略.........