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//===- LLVMPrintFunctionNames.cpp
//---------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
//
// Example clang plugin which simply prints the names of all the functions
// within the generated LLVM code.
//
//===----------------------------------------------------------------------===//
#include "clang/AST/AST.h"
#include "clang/AST/ASTConsumer.h"
#include "clang/AST/RecursiveASTVisitor.h"
#include "clang/Frontend/CompilerInstance.h"
#include "clang/Frontend/FrontendPluginRegistry.h"
#include "clang/Sema/Sema.h"
#include "llvm/IR/Module.h"
#include "llvm/IR/PassManager.h"
#include "llvm/Passes/OptimizationLevel.h"
#include "llvm/Passes/PassBuilder.h"
#include "llvm/Support/raw_ostream.h"
using namespace clang;
namespace {
class PrintPass final : public llvm::AnalysisInfoMixin<PrintPass> {
friend struct llvm::AnalysisInfoMixin<PrintPass>;
public:
using Result = llvm::PreservedAnalyses;
Result run(llvm::Module &M, llvm::ModuleAnalysisManager &MAM) {
for (auto &F : M)
llvm::outs() << "[PrintPass] Found function: " << F.getName() << "\n";
return llvm::PreservedAnalyses::all();
}
static bool isRequired() { return true; }
};
void PrintCallback(llvm::PassBuilder &PB) {
PB.registerPipelineStartEPCallback(
[](llvm::ModulePassManager &MPM, llvm::OptimizationLevel) {
MPM.addPass(PrintPass());
});
}
class LLVMPrintFunctionsConsumer : public ASTConsumer {
public:
LLVMPrintFunctionsConsumer(CompilerInstance &Instance) {
Instance.getCodeGenOpts().PassBuilderCallbacks.push_back(PrintCallback);
}
};
class LLVMPrintFunctionNamesAction : public PluginASTAction {
protected:
std::unique_ptr<ASTConsumer> CreateASTConsumer(CompilerInstance &CI,
llvm::StringRef) override {
return std::make_unique<LLVMPrintFunctionsConsumer>(CI);
}
bool ParseArgs(const CompilerInstance &,
const std::vector<std::string> &) override {
return true;
}
PluginASTAction::ActionType getActionType() override {
return AddBeforeMainAction;
}
};
} // namespace
static FrontendPluginRegistry::Add<LLVMPrintFunctionNamesAction>
X("llvm-print-fns", "print function names, llvm level");
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