本文整理汇总了C++中GetElementPtrInst::insertBefore方法的典型用法代码示例。如果您正苦于以下问题：C++ GetElementPtrInst::insertBefore方法的具体用法？C++ GetElementPtrInst::insertBefore怎么用？C++ GetElementPtrInst::insertBefore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::insertBefore方法的1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:
unordered_multimap<const char*, Value*>& ArgumentRecovery::exposeAllRegisters(llvm::Function* fn)
{
auto iter = registerAddresses.find(fn);
if (iter != registerAddresses.end())
{
return iter->second;
}
auto& addresses = registerAddresses[fn];
if (fn->isDeclaration())
{
// If a function has no body, it doesn't need a register map.
return addresses;
}
Argument* firstArg = fn->arg_begin();
assert(isStructType(firstArg));
// Get explicitly-used GEPs
const auto& target = getAnalysis<TargetInfo>();
for (User* user : firstArg->users())
{
if (auto gep = dyn_cast<GetElementPtrInst>(user))
{
const char* name = target.registerName(*gep);
const char* largestRegister = target.largestOverlappingRegister(name);
addresses.insert({largestRegister, gep});
}
}
// Synthesize GEPs for implicitly-used registers.
// Implicit uses are when a function callee uses a register without there being a reference in the caller.
// This happens either because the parameter is passed through, or because the register is a scratch register that
// the caller doesn't use itself.
auto insertionPoint = fn->begin()->begin();
auto& regUse = getAnalysis<RegisterUse>();
const auto& modRefInfo = *regUse.getModRefInfo(fn);
for (const auto& pair : modRefInfo)
{
if ((pair.second & RegisterUse::ModRef) != 0 && addresses.find(pair.first) == addresses.end())
{
// Need a GEP here, because the function ModRefs the register implicitly.
GetElementPtrInst* synthesizedGep = target.getRegister(firstArg, pair.first);
synthesizedGep->insertBefore(insertionPoint);
addresses.insert({pair.first, synthesizedGep});
}
}
return addresses;
}