mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-25 04:02:41 +01:00
109 lines
3.4 KiB
C++
109 lines
3.4 KiB
C++
//===-- AutoUpgrade.cpp - Implement auto-upgrade helper functions ---------===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file implements the auto-upgrade helper functions
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/AutoUpgrade.h"
|
|
#include "llvm/Constants.h"
|
|
#include "llvm/Function.h"
|
|
#include "llvm/Instruction.h"
|
|
#include "llvm/LLVMContext.h"
|
|
#include "llvm/Module.h"
|
|
#include "llvm/IntrinsicInst.h"
|
|
#include "llvm/ADT/DenseMap.h"
|
|
#include "llvm/ADT/SmallPtrSet.h"
|
|
#include "llvm/ADT/SmallVector.h"
|
|
#include "llvm/Support/CallSite.h"
|
|
#include "llvm/Support/CFG.h"
|
|
#include "llvm/Support/ErrorHandling.h"
|
|
#include "llvm/Support/IRBuilder.h"
|
|
#include <cstring>
|
|
using namespace llvm;
|
|
|
|
|
|
static bool UpgradeIntrinsicFunction1(Function *F, Function *&NewFn) {
|
|
assert(F && "Illegal to upgrade a non-existent Function.");
|
|
|
|
// Quickly eliminate it, if it's not a candidate.
|
|
StringRef Name = F->getName();
|
|
if (Name.size() <= 8 || !Name.startswith("llvm."))
|
|
return false;
|
|
Name = Name.substr(5); // Strip off "llvm."
|
|
|
|
switch (Name[0]) {
|
|
default: break;
|
|
// SOMEDAY: Add some.
|
|
}
|
|
|
|
// This may not belong here. This function is effectively being overloaded
|
|
// to both detect an intrinsic which needs upgrading, and to provide the
|
|
// upgraded form of the intrinsic. We should perhaps have two separate
|
|
// functions for this.
|
|
return false;
|
|
}
|
|
|
|
bool llvm::UpgradeIntrinsicFunction(Function *F, Function *&NewFn) {
|
|
NewFn = 0;
|
|
bool Upgraded = UpgradeIntrinsicFunction1(F, NewFn);
|
|
|
|
// Upgrade intrinsic attributes. This does not change the function.
|
|
if (NewFn)
|
|
F = NewFn;
|
|
if (unsigned id = F->getIntrinsicID())
|
|
F->setAttributes(Intrinsic::getAttributes((Intrinsic::ID)id));
|
|
return Upgraded;
|
|
}
|
|
|
|
bool llvm::UpgradeGlobalVariable(GlobalVariable *GV) {
|
|
// Nothing to do yet.
|
|
return false;
|
|
}
|
|
|
|
// UpgradeIntrinsicCall - Upgrade a call to an old intrinsic to be a call the
|
|
// upgraded intrinsic. All argument and return casting must be provided in
|
|
// order to seamlessly integrate with existing context.
|
|
void llvm::UpgradeIntrinsicCall(CallInst *CI, Function *NewFn) {
|
|
Function *F = CI->getCalledFunction();
|
|
|
|
assert(F && "CallInst has no function associated with it.");
|
|
|
|
if (NewFn) return;
|
|
|
|
if (F->getName() == "llvm.something eventually") {
|
|
// UPGRADE HERE.
|
|
} else {
|
|
llvm_unreachable("Unknown function for CallInst upgrade.");
|
|
}
|
|
}
|
|
|
|
// This tests each Function to determine if it needs upgrading. When we find
|
|
// one we are interested in, we then upgrade all calls to reflect the new
|
|
// function.
|
|
void llvm::UpgradeCallsToIntrinsic(Function* F) {
|
|
assert(F && "Illegal attempt to upgrade a non-existent intrinsic.");
|
|
|
|
// Upgrade the function and check if it is a totaly new function.
|
|
Function *NewFn;
|
|
if (UpgradeIntrinsicFunction(F, NewFn)) {
|
|
if (NewFn != F) {
|
|
// Replace all uses to the old function with the new one if necessary.
|
|
for (Value::use_iterator UI = F->use_begin(), UE = F->use_end();
|
|
UI != UE; ) {
|
|
if (CallInst *CI = dyn_cast<CallInst>(*UI++))
|
|
UpgradeIntrinsicCall(CI, NewFn);
|
|
}
|
|
// Remove old function, no longer used, from the module.
|
|
F->eraseFromParent();
|
|
}
|
|
}
|
|
}
|
|
|