1 //===- AnalysisWrappers.cpp - Wrappers around non-pass analyses -----------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file defines pass wrappers around LLVM analyses that don't make sense to
11 // be passes. It provides a nice standard pass interface to these classes so
12 // that they can be printed out by analyze.
14 // These classes are separated out of analyze.cpp so that it is more clear which
15 // code is the integral part of the analyze tool, and which part of the code is
16 // just making it so more passes are available.
18 //===----------------------------------------------------------------------===//
20 #include "llvm/Analysis/CallGraph.h"
21 #include "llvm/IR/CallSite.h"
22 #include "llvm/IR/Module.h"
23 #include "llvm/Pass.h"
24 #include "llvm/Support/raw_ostream.h"
28 /// ExternalFunctionsPassedConstants - This pass prints out call sites to
29 /// external functions that are called with constant arguments. This can be
30 /// useful when looking for standard library functions we should constant fold
31 /// or handle in alias analyses.
32 struct ExternalFunctionsPassedConstants : public ModulePass {
33 static char ID; // Pass ID, replacement for typeid
34 ExternalFunctionsPassedConstants() : ModulePass(ID) {}
35 bool runOnModule(Module &M) override {
36 for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
37 if (!I->isDeclaration()) continue;
39 bool PrintedFn = false;
40 for (User *U : I->users()) {
41 Instruction *UI = dyn_cast<Instruction>(U);
44 CallSite CS(cast<Value>(UI));
47 for (CallSite::arg_iterator AI = CS.arg_begin(),
48 E = CS.arg_end(); AI != E; ++AI) {
49 if (!isa<Constant>(*AI)) continue;
52 errs() << "Function '" << I->getName() << "':\n";
64 void getAnalysisUsage(AnalysisUsage &AU) const override {
70 char ExternalFunctionsPassedConstants::ID = 0;
71 static RegisterPass<ExternalFunctionsPassedConstants>
72 P1("print-externalfnconstants",
73 "Print external fn callsites passed constants");
76 struct CallGraphPrinter : public ModulePass {
77 static char ID; // Pass ID, replacement for typeid
78 CallGraphPrinter() : ModulePass(ID) {}
80 void getAnalysisUsage(AnalysisUsage &AU) const override {
82 AU.addRequiredTransitive<CallGraphWrapperPass>();
84 bool runOnModule(Module &M) override {
85 getAnalysis<CallGraphWrapperPass>().print(errs(), &M);
91 char CallGraphPrinter::ID = 0;
92 static RegisterPass<CallGraphPrinter>
93 P2("print-callgraph", "Print a call graph");