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b12914bfc0
from ModulePass. Instead of implementing Pass::run, then should implement ModulePass::runOnModule. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16436 91177308-0d34-0410-b5e6-96231b3b80d8
68 lines
2.5 KiB
C++
68 lines
2.5 KiB
C++
//===- AnalysisWrappers.cpp - Wrappers around non-pass analyses -----------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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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/Module.h"
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#include "llvm/Pass.h"
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#include "llvm/Support/CallSite.h"
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#include <iostream>
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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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virtual bool runOnModule(Module &M) {
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for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
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if (I->isExternal()) {
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bool PrintedFn = false;
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for (Value::use_iterator UI = I->use_begin(), E = I->use_end();
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UI != E; ++UI)
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if (Instruction *User = dyn_cast<Instruction>(*UI)) {
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CallSite CS = CallSite::get(User);
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if (CS.getInstruction()) {
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for (CallSite::arg_iterator AI = CS.arg_begin(),
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E = CS.arg_end(); AI != E; ++AI)
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if (isa<Constant>(*AI)) {
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if (!PrintedFn) {
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std::cerr << "Function '" << I->getName() << "':\n";
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PrintedFn = true;
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}
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std::cerr << *User;
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break;
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}
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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 print(std::ostream &OS) const {}
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virtual void getAnalysisUsage(AnalysisUsage &AU) const {
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AU.setPreservesAll();
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}
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};
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RegisterAnalysis<ExternalFunctionsPassedConstants>
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P2("externalfnconstants", "Print external fn callsites passed constants");
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}
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