1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465666768697071 |
- //===- AnalysisWrappers.cpp - Wrappers around non-pass analyses -----------===//
- //
- // 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 file defines pass wrappers around LLVM analyses that don't make sense to
- // be passes. It provides a nice standard pass interface to these classes so
- // that they can be printed out by analyze.
- //
- // These classes are separated out of analyze.cpp so that it is more clear which
- // code is the integral part of the analyze tool, and which part of the code is
- // just making it so more passes are available.
- //
- //===----------------------------------------------------------------------===//
- #include "llvm/Analysis/CallGraph.h"
- #include "llvm/IR/Module.h"
- #include "llvm/Pass.h"
- #include "llvm/Support/raw_ostream.h"
- using namespace llvm;
- namespace {
- /// ExternalFunctionsPassedConstants - This pass prints out call sites to
- /// external functions that are called with constant arguments. This can be
- /// useful when looking for standard library functions we should constant fold
- /// or handle in alias analyses.
- struct ExternalFunctionsPassedConstants : public ModulePass {
- static char ID; // Pass ID, replacement for typeid
- ExternalFunctionsPassedConstants() : ModulePass(ID) {}
- bool runOnModule(Module &M) override {
- for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
- if (!I->isDeclaration()) continue;
- bool PrintedFn = false;
- for (User *U : I->users()) {
- Instruction *UI = dyn_cast<Instruction>(U);
- if (!UI) continue;
- CallBase *CB = dyn_cast<CallBase>(UI);
- if (!CB)
- continue;
- for (auto AI = CB->arg_begin(), E = CB->arg_end(); AI != E; ++AI) {
- if (!isa<Constant>(*AI)) continue;
- if (!PrintedFn) {
- errs() << "Function '" << I->getName() << "':\n";
- PrintedFn = true;
- }
- errs() << *UI;
- break;
- }
- }
- }
- return false;
- }
- void getAnalysisUsage(AnalysisUsage &AU) const override {
- AU.setPreservesAll();
- }
- };
- }
- char ExternalFunctionsPassedConstants::ID = 0;
- static RegisterPass<ExternalFunctionsPassedConstants>
- P1("print-externalfnconstants",
- "Print external fn callsites passed constants");
|