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