92 lines
2.8 KiB
C++
92 lines
2.8 KiB
C++
//===------ DumpFunctionPass.cpp --------------------------------*- C++ -*-===//
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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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// Write a function to a file.
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//
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//===----------------------------------------------------------------------===//
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#include "polly/Support/DumpFunctionPass.h"
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#include "polly/Support/PollyDebug.h"
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#include "llvm/IR/Module.h"
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#include "llvm/IR/PassInstrumentation.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/FileSystem.h"
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#include "llvm/Support/Path.h"
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#include "llvm/Support/ToolOutputFile.h"
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#include "llvm/Transforms/IPO/GlobalDCE.h"
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#include "llvm/Transforms/IPO/StripDeadPrototypes.h"
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#include "llvm/Transforms/Utils/Cloning.h"
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#define DEBUG_TYPE "polly-dump-func"
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using namespace llvm;
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using namespace polly;
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namespace {
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static void runDumpFunction(llvm::Function &F, StringRef Suffix) {
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StringRef FName = F.getName();
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Module *M = F.getParent();
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StringRef ModuleName = M->getName();
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StringRef Stem = sys::path::stem(ModuleName);
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std::string Dumpfile = (Twine(Stem) + "-" + FName + Suffix + ".ll").str();
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POLLY_DEBUG(dbgs() << "Dumping function '" << FName << "' to '" << Dumpfile
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<< "'...\n");
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ValueToValueMapTy VMap;
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auto ShouldCloneDefinition = [&F](const GlobalValue *GV) -> bool {
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return GV == &F;
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};
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std::unique_ptr<Module> CM = CloneModule(*M, VMap, ShouldCloneDefinition);
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Function *NewF = cast<Function>(VMap.lookup(&F));
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assert(NewF && "Expected selected function to be cloned");
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POLLY_DEBUG(dbgs() << "Global DCE...\n");
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// Stop F itself from being pruned
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GlobalValue::LinkageTypes OrigLinkage = NewF->getLinkage();
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NewF->setLinkage(GlobalValue::ExternalLinkage);
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{
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ModuleAnalysisManager MAM;
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ModulePassManager MPM;
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PassInstrumentationCallbacks PIC;
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MAM.registerPass([&] { return PassInstrumentationAnalysis(&PIC); });
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MPM.addPass(GlobalDCEPass());
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MPM.addPass(StripDeadPrototypesPass());
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MPM.run(*CM, MAM);
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}
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// Restore old linkage
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NewF->setLinkage(OrigLinkage);
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POLLY_DEBUG(dbgs() << "Write to file '" << Dumpfile << "'...\n");
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std::unique_ptr<ToolOutputFile> Out;
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std::error_code EC;
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Out.reset(new ToolOutputFile(Dumpfile, EC, sys::fs::OF_None));
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if (EC) {
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errs() << EC.message() << '\n';
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return;
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}
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CM->print(Out->os(), nullptr);
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Out->keep();
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POLLY_DEBUG(dbgs() << "Dump file " << Dumpfile << " written successfully\n");
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}
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} // namespace
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llvm::PreservedAnalyses DumpFunctionPass::run(Function &F,
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FunctionAnalysisManager &AM) {
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runDumpFunction(F, Suffix);
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return PreservedAnalyses::all();
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}
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