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75e10dcf71
This is mostly NFC, but I removed the setting of the guard's calling convention onto the WC call. Why? Because it was untested, and was producing an ill defined output as the declaration's convention wasn't been changed leaving a mismatch which is UB.
91 lines
2.8 KiB
C++
91 lines
2.8 KiB
C++
//===- LowerGuardIntrinsic.cpp - Lower the guard intrinsic ---------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This pass lowers the llvm.experimental.guard intrinsic to a conditional call
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// to @llvm.experimental.deoptimize. Once this happens, the guard can no longer
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// be widened.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Transforms/Scalar/LowerGuardIntrinsic.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/Analysis/GuardUtils.h"
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#include "llvm/IR/BasicBlock.h"
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#include "llvm/IR/Function.h"
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#include "llvm/IR/InstIterator.h"
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#include "llvm/IR/Instructions.h"
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#include "llvm/IR/Intrinsics.h"
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#include "llvm/IR/Module.h"
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#include "llvm/InitializePasses.h"
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#include "llvm/Pass.h"
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#include "llvm/Transforms/Scalar.h"
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#include "llvm/Transforms/Utils/GuardUtils.h"
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using namespace llvm;
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namespace {
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struct LowerGuardIntrinsicLegacyPass : public FunctionPass {
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static char ID;
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LowerGuardIntrinsicLegacyPass() : FunctionPass(ID) {
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initializeLowerGuardIntrinsicLegacyPassPass(
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*PassRegistry::getPassRegistry());
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}
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bool runOnFunction(Function &F) override;
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};
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}
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static bool lowerGuardIntrinsic(Function &F) {
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// Check if we can cheaply rule out the possibility of not having any work to
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// do.
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auto *GuardDecl = F.getParent()->getFunction(
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Intrinsic::getName(Intrinsic::experimental_guard));
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if (!GuardDecl || GuardDecl->use_empty())
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return false;
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SmallVector<CallInst *, 8> ToLower;
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for (auto &I : instructions(F))
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if (isGuard(&I))
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ToLower.push_back(cast<CallInst>(&I));
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if (ToLower.empty())
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return false;
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auto *DeoptIntrinsic = Intrinsic::getDeclaration(
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F.getParent(), Intrinsic::experimental_deoptimize, {F.getReturnType()});
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DeoptIntrinsic->setCallingConv(GuardDecl->getCallingConv());
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for (auto *CI : ToLower) {
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makeGuardControlFlowExplicit(DeoptIntrinsic, CI, false);
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CI->eraseFromParent();
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}
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return true;
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}
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bool LowerGuardIntrinsicLegacyPass::runOnFunction(Function &F) {
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return lowerGuardIntrinsic(F);
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}
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char LowerGuardIntrinsicLegacyPass::ID = 0;
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INITIALIZE_PASS(LowerGuardIntrinsicLegacyPass, "lower-guard-intrinsic",
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"Lower the guard intrinsic to normal control flow", false,
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false)
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Pass *llvm::createLowerGuardIntrinsicPass() {
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return new LowerGuardIntrinsicLegacyPass();
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}
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PreservedAnalyses LowerGuardIntrinsicPass::run(Function &F,
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FunctionAnalysisManager &AM) {
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if (lowerGuardIntrinsic(F))
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return PreservedAnalyses::none();
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return PreservedAnalyses::all();
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}
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