1 //===- AnalysisWrappers.cpp - Wrappers around non-pass analyses -----------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 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. 13 // 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. 17 // 18 //===----------------------------------------------------------------------===// 19 20 #include "llvm/Module.h" 21 #include "llvm/Pass.h" 22 #include "llvm/Support/CallSite.h" 23 #include "llvm/Analysis/CallGraph.h" 24 #include "llvm/Support/raw_ostream.h" 25 using namespace llvm; 26 27 namespace { 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 virtual bool runOnModule(Module &M) { 36 for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) { 37 if (!I->isDeclaration()) continue; 38 39 bool PrintedFn = false; 40 for (Value::use_iterator UI = I->use_begin(), E = I->use_end(); 41 UI != E; ++UI) { 42 Instruction *User = dyn_cast<Instruction>(*UI); 43 if (!User) continue; 44 45 CallSite CS(cast<Value>(User)); 46 if (!CS) continue; 47 48 for (CallSite::arg_iterator AI = CS.arg_begin(), 49 E = CS.arg_end(); AI != E; ++AI) { 50 if (!isa<Constant>(*AI)) continue; 51 52 if (!PrintedFn) { 53 errs() << "Function '" << I->getName() << "':\n"; 54 PrintedFn = true; 55 } 56 errs() << *User; 57 break; 58 } 59 } 60 } 61 62 return false; 63 } 64 65 virtual void getAnalysisUsage(AnalysisUsage &AU) const { 66 AU.setPreservesAll(); 67 } 68 }; 69 } 70 71 char ExternalFunctionsPassedConstants::ID = 0; 72 static RegisterPass<ExternalFunctionsPassedConstants> 73 P1("print-externalfnconstants", 74 "Print external fn callsites passed constants"); 75 76 namespace { 77 struct CallGraphPrinter : public ModulePass { 78 static char ID; // Pass ID, replacement for typeid 79 CallGraphPrinter() : ModulePass(ID) {} 80 81 virtual void getAnalysisUsage(AnalysisUsage &AU) const { 82 AU.setPreservesAll(); 83 AU.addRequiredTransitive<CallGraph>(); 84 } 85 virtual bool runOnModule(Module &M) { 86 getAnalysis<CallGraph>().print(errs(), &M); 87 return false; 88 } 89 }; 90 } 91 92 char CallGraphPrinter::ID = 0; 93 static RegisterPass<CallGraphPrinter> 94 P2("print-callgraph", "Print a call graph"); 95
