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-rw-r--r--contrib/llvm/lib/Transforms/Utils/LowerInvoke.cpp96
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diff --git a/contrib/llvm/lib/Transforms/Utils/LowerInvoke.cpp b/contrib/llvm/lib/Transforms/Utils/LowerInvoke.cpp
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index fe67e191dc62..000000000000
--- a/contrib/llvm/lib/Transforms/Utils/LowerInvoke.cpp
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-//===- LowerInvoke.cpp - Eliminate Invoke instructions --------------------===//
-//
-// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
-// See https://llvm.org/LICENSE.txt for license information.
-// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
-//
-//===----------------------------------------------------------------------===//
-//
-// This transformation is designed for use by code generators which do not yet
-// support stack unwinding. This pass converts 'invoke' instructions to 'call'
-// instructions, so that any exception-handling 'landingpad' blocks become dead
-// code (which can be removed by running the '-simplifycfg' pass afterwards).
-//
-//===----------------------------------------------------------------------===//
-
-#include "llvm/Transforms/Utils/LowerInvoke.h"
-#include "llvm/ADT/SmallVector.h"
-#include "llvm/ADT/Statistic.h"
-#include "llvm/IR/Instructions.h"
-#include "llvm/IR/LLVMContext.h"
-#include "llvm/IR/Module.h"
-#include "llvm/Pass.h"
-#include "llvm/Transforms/Utils.h"
-using namespace llvm;
-
-#define DEBUG_TYPE "lowerinvoke"
-
-STATISTIC(NumInvokes, "Number of invokes replaced");
-
-namespace {
- class LowerInvokeLegacyPass : public FunctionPass {
- public:
- static char ID; // Pass identification, replacement for typeid
- explicit LowerInvokeLegacyPass() : FunctionPass(ID) {
- initializeLowerInvokeLegacyPassPass(*PassRegistry::getPassRegistry());
- }
- bool runOnFunction(Function &F) override;
- };
-}
-
-char LowerInvokeLegacyPass::ID = 0;
-INITIALIZE_PASS(LowerInvokeLegacyPass, "lowerinvoke",
- "Lower invoke and unwind, for unwindless code generators",
- false, false)
-
-static bool runImpl(Function &F) {
- bool Changed = false;
- for (BasicBlock &BB : F)
- if (InvokeInst *II = dyn_cast<InvokeInst>(BB.getTerminator())) {
- SmallVector<Value *, 16> CallArgs(II->arg_begin(), II->arg_end());
- SmallVector<OperandBundleDef, 1> OpBundles;
- II->getOperandBundlesAsDefs(OpBundles);
- // Insert a normal call instruction...
- CallInst *NewCall =
- CallInst::Create(II->getFunctionType(), II->getCalledValue(),
- CallArgs, OpBundles, "", II);
- NewCall->takeName(II);
- NewCall->setCallingConv(II->getCallingConv());
- NewCall->setAttributes(II->getAttributes());
- NewCall->setDebugLoc(II->getDebugLoc());
- II->replaceAllUsesWith(NewCall);
-
- // Insert an unconditional branch to the normal destination.
- BranchInst::Create(II->getNormalDest(), II);
-
- // Remove any PHI node entries from the exception destination.
- II->getUnwindDest()->removePredecessor(&BB);
-
- // Remove the invoke instruction now.
- BB.getInstList().erase(II);
-
- ++NumInvokes;
- Changed = true;
- }
- return Changed;
-}
-
-bool LowerInvokeLegacyPass::runOnFunction(Function &F) {
- return runImpl(F);
-}
-
-namespace llvm {
-char &LowerInvokePassID = LowerInvokeLegacyPass::ID;
-
-// Public Interface To the LowerInvoke pass.
-FunctionPass *createLowerInvokePass() { return new LowerInvokeLegacyPass(); }
-
-PreservedAnalyses LowerInvokePass::run(Function &F,
- FunctionAnalysisManager &AM) {
- bool Changed = runImpl(F);
- if (!Changed)
- return PreservedAnalyses::all();
-
- return PreservedAnalyses::none();
-}
-}