forked from OSchip/llvm-project
135 lines
4.5 KiB
C++
135 lines
4.5 KiB
C++
//===-- AutoUpgrade.cpp - Implement auto-upgrade helper functions ---------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the auto-upgrade helper functions
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/AutoUpgrade.h"
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#include "llvm/Constants.h"
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#include "llvm/Function.h"
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#include "llvm/Instruction.h"
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#include "llvm/LLVMContext.h"
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#include "llvm/Module.h"
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#include "llvm/IntrinsicInst.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/SmallPtrSet.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/Support/CallSite.h"
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#include "llvm/Support/CFG.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/IRBuilder.h"
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#include <cstring>
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using namespace llvm;
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static bool UpgradeIntrinsicFunction1(Function *F, Function *&NewFn) {
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assert(F && "Illegal to upgrade a non-existent Function.");
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// Quickly eliminate it, if it's not a candidate.
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StringRef Name = F->getName();
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if (Name.size() <= 8 || !Name.startswith("llvm."))
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return false;
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Name = Name.substr(5); // Strip off "llvm."
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switch (Name[0]) {
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default: break;
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case 'm':
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if (Name == "memory.barrier")
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return true;
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break;
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}
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// This may not belong here. This function is effectively being overloaded
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// to both detect an intrinsic which needs upgrading, and to provide the
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// upgraded form of the intrinsic. We should perhaps have two separate
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// functions for this.
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return false;
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}
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bool llvm::UpgradeIntrinsicFunction(Function *F, Function *&NewFn) {
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NewFn = 0;
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bool Upgraded = UpgradeIntrinsicFunction1(F, NewFn);
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// Upgrade intrinsic attributes. This does not change the function.
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if (NewFn)
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F = NewFn;
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if (unsigned id = F->getIntrinsicID())
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F->setAttributes(Intrinsic::getAttributes((Intrinsic::ID)id));
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return Upgraded;
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}
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bool llvm::UpgradeGlobalVariable(GlobalVariable *GV) {
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// Nothing to do yet.
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return false;
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}
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// UpgradeIntrinsicCall - Upgrade a call to an old intrinsic to be a call the
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// upgraded intrinsic. All argument and return casting must be provided in
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// order to seamlessly integrate with existing context.
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void llvm::UpgradeIntrinsicCall(CallInst *CI, Function *NewFn) {
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Function *F = CI->getCalledFunction();
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LLVMContext &C = CI->getContext();
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ImmutableCallSite CS(CI);
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assert(F && "CallInst has no function associated with it.");
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if (!NewFn) {
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if (F->getName() == "llvm.memory.barrier") {
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IRBuilder<> Builder(C);
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Builder.SetInsertPoint(CI->getParent(), CI);
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// Note that this conversion ignores the "device" bit; it was not really
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// well-defined, and got abused because nobody paid enough attention to
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// get it right. In practice, this probably doesn't matter; application
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// code generally doesn't need anything stronger than
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// SequentiallyConsistent (and realistically, SequentiallyConsistent
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// is lowered to a strong enough barrier for almost anything).
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if (cast<ConstantInt>(CI->getArgOperand(1))->getZExtValue())
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Builder.CreateFence(SequentiallyConsistent);
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else if (!cast<ConstantInt>(CI->getArgOperand(0))->getZExtValue())
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Builder.CreateFence(Release);
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else if (!cast<ConstantInt>(CI->getArgOperand(3))->getZExtValue())
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Builder.CreateFence(Acquire);
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else
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Builder.CreateFence(AcquireRelease);
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// Remove intrinsic.
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CI->eraseFromParent();
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} else {
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llvm_unreachable("Unknown function for CallInst upgrade.");
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}
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return;
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}
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}
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// This tests each Function to determine if it needs upgrading. When we find
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// one we are interested in, we then upgrade all calls to reflect the new
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// function.
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void llvm::UpgradeCallsToIntrinsic(Function* F) {
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assert(F && "Illegal attempt to upgrade a non-existent intrinsic.");
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// Upgrade the function and check if it is a totaly new function.
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Function *NewFn;
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if (UpgradeIntrinsicFunction(F, NewFn)) {
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if (NewFn != F) {
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// Replace all uses to the old function with the new one if necessary.
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for (Value::use_iterator UI = F->use_begin(), UE = F->use_end();
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UI != UE; ) {
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if (CallInst *CI = dyn_cast<CallInst>(*UI++))
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UpgradeIntrinsicCall(CI, NewFn);
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}
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// Remove old function, no longer used, from the module.
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F->eraseFromParent();
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}
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}
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}
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