| 1 | //===- LLVMPrintFunctionNames.cpp |
|---|---|
| 2 | //---------------------------------------------===// |
| 3 | // |
| 4 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 5 | // See https://llvm.org/LICENSE.txt for license information. |
| 6 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 7 | // |
| 8 | //===----------------------------------------------------------------------===// |
| 9 | // |
| 10 | // Example clang plugin which simply prints the names of all the functions |
| 11 | // within the generated LLVM code. |
| 12 | // |
| 13 | //===----------------------------------------------------------------------===// |
| 14 | |
| 15 | #include "clang/AST/AST.h" |
| 16 | #include "clang/AST/ASTConsumer.h" |
| 17 | #include "clang/AST/RecursiveASTVisitor.h" |
| 18 | #include "clang/Frontend/CompilerInstance.h" |
| 19 | #include "clang/Frontend/FrontendPluginRegistry.h" |
| 20 | #include "clang/Sema/Sema.h" |
| 21 | #include "llvm/IR/PassManager.h" |
| 22 | #include "llvm/Passes/OptimizationLevel.h" |
| 23 | #include "llvm/Passes/PassBuilder.h" |
| 24 | #include "llvm/Support/raw_ostream.h" |
| 25 | using namespace clang; |
| 26 | |
| 27 | namespace { |
| 28 | |
| 29 | class PrintPass final : public llvm::AnalysisInfoMixin<PrintPass> { |
| 30 | friend struct llvm::AnalysisInfoMixin<PrintPass>; |
| 31 | |
| 32 | public: |
| 33 | using Result = llvm::PreservedAnalyses; |
| 34 | |
| 35 | Result run(llvm::Module &M, llvm::ModuleAnalysisManager &MAM) { |
| 36 | for (auto &F : M) |
| 37 | llvm::outs() << "[PrintPass] Found function: "<< F.getName() << "\n"; |
| 38 | return llvm::PreservedAnalyses::all(); |
| 39 | } |
| 40 | static bool isRequired() { return true; } |
| 41 | }; |
| 42 | |
| 43 | void PrintCallback(llvm::PassBuilder &PB) { |
| 44 | PB.registerPipelineStartEPCallback( |
| 45 | C: [](llvm::ModulePassManager &MPM, llvm::OptimizationLevel) { |
| 46 | MPM.addPass(Pass: PrintPass()); |
| 47 | }); |
| 48 | } |
| 49 | |
| 50 | class LLVMPrintFunctionsConsumer : public ASTConsumer { |
| 51 | public: |
| 52 | LLVMPrintFunctionsConsumer(CompilerInstance &Instance) { |
| 53 | Instance.getCodeGenOpts().PassBuilderCallbacks.push_back(x: PrintCallback); |
| 54 | } |
| 55 | }; |
| 56 | |
| 57 | class LLVMPrintFunctionNamesAction : public PluginASTAction { |
| 58 | protected: |
| 59 | std::unique_ptr<ASTConsumer> CreateASTConsumer(CompilerInstance &CI, |
| 60 | llvm::StringRef) override { |
| 61 | return std::make_unique<LLVMPrintFunctionsConsumer>(args&: CI); |
| 62 | } |
| 63 | bool ParseArgs(const CompilerInstance &, |
| 64 | const std::vector<std::string> &) override { |
| 65 | return true; |
| 66 | } |
| 67 | PluginASTAction::ActionType getActionType() override { |
| 68 | return AddBeforeMainAction; |
| 69 | } |
| 70 | }; |
| 71 | |
| 72 | } // namespace |
| 73 | |
| 74 | static FrontendPluginRegistry::Add<LLVMPrintFunctionNamesAction> |
| 75 | X("llvm-print-fns", "print function names, llvm level"); |
| 76 |