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/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"
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;
39 bool PrintedFn = false;
40 for (Value::use_iterator UI = I->use_begin(), E = I->use_end();
42 Instruction *User = dyn_cast<Instruction>(*UI);
45 CallSite CS(cast<Value>(User));
48 for (CallSite::arg_iterator AI = CS.arg_begin(),
49 E = CS.arg_end(); AI != E; ++AI) {
50 if (!isa<Constant>(*AI)) continue;
53 errs() << "Function '" << I->getName() << "':\n";
65 virtual void getAnalysisUsage(AnalysisUsage &AU) const {
70 char ExternalFunctionsPassedConstants::ID = 0;
71 RegisterPass<ExternalFunctionsPassedConstants>
72 P1("print-externalfnconstants",
73 "Print external fn callsites passed constants");
75 struct CallGraphPrinter : public ModulePass {
76 static char ID; // Pass ID, replacement for typeid
77 CallGraphPrinter() : ModulePass(&ID) {}
79 virtual void getAnalysisUsage(AnalysisUsage &AU) const {
81 AU.addRequiredTransitive<CallGraph>();
83 virtual bool runOnModule(Module &M) {
84 getAnalysis<CallGraph>().print(errs(), &M);
89 char CallGraphPrinter::ID = 0;
90 RegisterPass<CallGraphPrinter>
91 P2("print-callgraph", "Print a call graph");