本文整理汇总了C++中GetElementPtrInst::accumulateConstantOffset方法的典型用法代码示例。如果您正苦于以下问题：C++ GetElementPtrInst::accumulateConstantOffset方法的具体用法？C++ GetElementPtrInst::accumulateConstantOffset怎么用？C++ GetElementPtrInst::accumulateConstantOffset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GetElementPtrInst的用法示例。
在下文中一共展示了GetElementPtrInst::accumulateConstantOffset方法的4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: handleFlavor
bool handleFlavor(LoadInst *li, ConstantExpr *gepce) {
if (VERBOSITY("opt") >= 1) {
errs() << "\nFound this load of a flavor attr:\n" << *li << '\n';
}
GetElementPtrInst *gep = cast<GetElementPtrInst>(gepce->getAsInstruction());
APInt ap_offset(64, 0, true);
bool success = gep->accumulateConstantOffset(*g.tm->getDataLayout(), ap_offset);
delete gep;
assert(success);
int64_t offset = ap_offset.getSExtValue();
if (offset == FLAVOR_KINDID_OFFSET) {
ObjectFlavor* flavor = getFlavorFromGV(cast<GlobalVariable>(gepce->getOperand(0)));
replaceUsesWithConstant(li, flavor->kind_id);
return true;
} else {
ASSERT(0, "%ld", offset);
return false;
}
assert(0);
return false;
}示例2:
bool detail::PtrUseVisitorBase::adjustOffsetForGEP(GetElementPtrInst &GEPI) {
if (!IsOffsetKnown)
return false;
return GEPI.accumulateConstantOffset(DL, Offset);
}示例3: handleCls
bool handleCls(LoadInst *li, GlobalVariable *gv) {
bool changed = true;
if (VERBOSITY("opt") >= 1) {
errs() << "\nFound load of class-typed global variable:\n" << *li << '\n';
}
BoxedClass *cls = getClassFromGV(gv);
if (!cls->is_constant) {
assert(0 && "what globally-resolved classes are not constant??");
if (VERBOSITY("opt") >= 1) {
errs() << gv->getName() << " is not constant; moving on\n";
}
return false;
}
std::vector<Instruction*> to_remove;
for (User* user : li->users()) {
if (CallInst *call = dyn_cast<CallInst>(user)) {
if (call->getCalledFunction()->getName() == "_maybeDecrefCls") {
errs() << "Found decrefcls call: " << *call << '\n';
if (!isUserDefined(cls)) {
// Don't delete right away; I think that invalidates the iterator
// we're currently iterating over
to_remove.push_back(call);
}
}
continue;
}
GetElementPtrInst *gep = dyn_cast<GetElementPtrInst>(user);
if (!gep) {
//errs() << "Not a gep: " << *user << '\n';
continue;
}
APInt ap_offset(64, 0, true);
bool success = gep->accumulateConstantOffset(*g.tm->getDataLayout(), ap_offset);
assert(success);
int64_t offset = ap_offset.getSExtValue();
errs() << "Found a gep at offset " << offset << ": " << *gep << '\n';
for (User* gep_user : gep->users()) {
LoadInst *gep_load = dyn_cast<LoadInst>(gep_user);
if (!gep_load) {
//errs() << "Not a load: " << *gep_user << '\n';
continue;
}
errs() << "Found a load: " << *gep_load << '\n';
if (offset == CLS_DTOR_OFFSET) {
errs() << "Dtor; replacing with " << cls->dtor << "\n";
replaceUsesWithConstant(gep_load, (uintptr_t)cls->dtor);
changed = true;
} else if (offset == CLS_HASATTRS_OFFSET) {
errs() << "Hasattrs; replacing with " << cls->hasattrs << "\n";
replaceUsesWithConstant(gep_load, cls->hasattrs);
changed = true;
}
}
}
for (int i = 0; i < to_remove.size(); i++) {
to_remove[i]->eraseFromParent();
changed = true;
}
if (VERBOSITY()) {
llvm::errs() << "Constant-folding this load: " << *li << '\n';
}
li->replaceAllUsesWith(embedConstantPtr(cls, g.llvm_class_type_ptr));
changed = true;
return changed;
}示例4: handleCls
bool handleCls(LoadInst* li, GlobalVariable* gv) {
bool changed = true;
if (VERBOSITY("opt") >= 1) {
errs() << "\nFound load of class-typed global variable:\n" << *li << '\n';
}
BoxedClass* cls = getClassFromGV(gv);
if (!cls->is_constant) {
assert(0 && "what globally-resolved classes are not constant??");
if (VERBOSITY("opt") >= 1) {
errs() << gv->getName() << " is not constant; moving on\n";
}
return false;
}
std::vector<Instruction*> to_remove;
for (User* user : li->users()) {
if (CallInst* call = dyn_cast<CallInst>(user)) {
continue;
}
GetElementPtrInst* gep = dyn_cast<GetElementPtrInst>(user);
if (!gep) {
// errs() << "Not a gep: " << *user << '\n';
continue;
}
APInt ap_offset(64, 0, true);
#if LLVMREV < 214781
bool success = gep->accumulateConstantOffset(*g.tm->getDataLayout(), ap_offset);
#elif LLVMREV < 227113
bool success = gep->accumulateConstantOffset(*g.tm->getSubtargetImpl()->getDataLayout(), ap_offset);
#else
bool success = gep->accumulateConstantOffset(*g.tm->getDataLayout(), ap_offset);
#endif
assert(success);
int64_t offset = ap_offset.getSExtValue();
if (VERBOSITY("opt") >= 1)
errs() << "Found a gep at offset " << offset << ": " << *gep << '\n';
for (User* gep_user : gep->users()) {
LoadInst* gep_load = dyn_cast<LoadInst>(gep_user);
if (!gep_load) {
// errs() << "Not a load: " << *gep_user << '\n';
continue;
}
if (VERBOSITY("opt") >= 1)
errs() << "Found a load: " << *gep_load << '\n';
if (offset == offsetof(BoxedClass, attrs_offset)) {
if (VERBOSITY("opt") >= 1)
errs() << "attrs_offset; replacing with " << cls->attrs_offset << "\n";
replaceUsesWithConstant(gep_load, cls->attrs_offset);
changed = true;
} else if (offset == offsetof(BoxedClass, tp_basicsize)) {
if (VERBOSITY("opt") >= 1)
errs() << "tp_basicsize; replacing with " << cls->tp_basicsize << "\n";
replaceUsesWithConstant(gep_load, cls->tp_basicsize);
changed = true;
}
}
}
for (int i = 0; i < to_remove.size(); i++) {
to_remove[i]->eraseFromParent();
changed = true;
}
if (VERBOSITY()) {
llvm::errs() << "Constant-folding this load: " << *li << '\n';
}
li->replaceAllUsesWith(embedConstantPtr(cls, g.llvm_class_type_ptr));
changed = true;
return changed;
}