05da2fe521
This file lists every pass in LLVM, and is included by Pass.h, which is very popular. Every time we add, remove, or rename a pass in LLVM, it caused lots of recompilation. I found this fact by looking at this table, which is sorted by the number of times a file was changed over the last 100,000 git commits multiplied by the number of object files that depend on it in the current checkout: recompiles touches affected_files header 342380 95 3604 llvm/include/llvm/ADT/STLExtras.h 314730 234 1345 llvm/include/llvm/InitializePasses.h 307036 118 2602 llvm/include/llvm/ADT/APInt.h 213049 59 3611 llvm/include/llvm/Support/MathExtras.h 170422 47 3626 llvm/include/llvm/Support/Compiler.h 162225 45 3605 llvm/include/llvm/ADT/Optional.h 158319 63 2513 llvm/include/llvm/ADT/Triple.h 140322 39 3598 llvm/include/llvm/ADT/StringRef.h 137647 59 2333 llvm/include/llvm/Support/Error.h 131619 73 1803 llvm/include/llvm/Support/FileSystem.h Before this change, touching InitializePasses.h would cause 1345 files to recompile. After this change, touching it only causes 550 compiles in an incremental rebuild. Reviewers: bkramer, asbirlea, bollu, jdoerfert Differential Revision: https://reviews.llvm.org/D70211
98 lines
3.3 KiB
C++
98 lines
3.3 KiB
C++
//===- LowerInvoke.cpp - Eliminate Invoke instructions --------------------===//
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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 transformation is designed for use by code generators which do not yet
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// support stack unwinding. This pass converts 'invoke' instructions to 'call'
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// instructions, so that any exception-handling 'landingpad' blocks become dead
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// code (which can be removed by running the '-simplifycfg' pass afterwards).
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Transforms/Utils/LowerInvoke.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/ADT/Statistic.h"
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#include "llvm/IR/Instructions.h"
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#include "llvm/IR/LLVMContext.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/Utils.h"
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using namespace llvm;
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#define DEBUG_TYPE "lowerinvoke"
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STATISTIC(NumInvokes, "Number of invokes replaced");
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namespace {
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class LowerInvokeLegacyPass : public FunctionPass {
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public:
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static char ID; // Pass identification, replacement for typeid
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explicit LowerInvokeLegacyPass() : FunctionPass(ID) {
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initializeLowerInvokeLegacyPassPass(*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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char LowerInvokeLegacyPass::ID = 0;
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INITIALIZE_PASS(LowerInvokeLegacyPass, "lowerinvoke",
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"Lower invoke and unwind, for unwindless code generators",
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false, false)
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static bool runImpl(Function &F) {
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bool Changed = false;
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for (BasicBlock &BB : F)
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if (InvokeInst *II = dyn_cast<InvokeInst>(BB.getTerminator())) {
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SmallVector<Value *, 16> CallArgs(II->arg_begin(), II->arg_end());
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SmallVector<OperandBundleDef, 1> OpBundles;
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II->getOperandBundlesAsDefs(OpBundles);
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// Insert a normal call instruction...
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CallInst *NewCall =
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CallInst::Create(II->getFunctionType(), II->getCalledValue(),
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CallArgs, OpBundles, "", II);
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NewCall->takeName(II);
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NewCall->setCallingConv(II->getCallingConv());
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NewCall->setAttributes(II->getAttributes());
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NewCall->setDebugLoc(II->getDebugLoc());
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II->replaceAllUsesWith(NewCall);
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// Insert an unconditional branch to the normal destination.
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BranchInst::Create(II->getNormalDest(), II);
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// Remove any PHI node entries from the exception destination.
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II->getUnwindDest()->removePredecessor(&BB);
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// Remove the invoke instruction now.
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BB.getInstList().erase(II);
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++NumInvokes;
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Changed = true;
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}
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return Changed;
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}
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bool LowerInvokeLegacyPass::runOnFunction(Function &F) {
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return runImpl(F);
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}
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namespace llvm {
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char &LowerInvokePassID = LowerInvokeLegacyPass::ID;
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// Public Interface To the LowerInvoke pass.
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FunctionPass *createLowerInvokePass() { return new LowerInvokeLegacyPass(); }
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PreservedAnalyses LowerInvokePass::run(Function &F,
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FunctionAnalysisManager &AM) {
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bool Changed = runImpl(F);
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if (!Changed)
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return PreservedAnalyses::all();
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return PreservedAnalyses::none();
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}
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}
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