1 //===- AnalysisWrappers.cpp - Wrappers around non-pass analyses -----------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source 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"
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 virtual bool runOnModule(Module &M) {
34 for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
35 if (I->isDeclaration()) {
36 bool PrintedFn = false;
37 for (Value::use_iterator UI = I->use_begin(), E = I->use_end();
39 if (Instruction *User = dyn_cast<Instruction>(*UI)) {
40 CallSite CS = CallSite::get(User);
41 if (CS.getInstruction()) {
42 for (CallSite::arg_iterator AI = CS.arg_begin(),
43 E = CS.arg_end(); AI != E; ++AI)
44 if (isa<Constant>(*AI)) {
46 std::cerr << "Function '" << I->getName() << "':\n";
59 virtual void getAnalysisUsage(AnalysisUsage &AU) const {
64 RegisterPass<ExternalFunctionsPassedConstants>
65 P1("externalfnconstants", "Print external fn callsites passed constants");
67 struct CallGraphPrinter : public ModulePass {
68 virtual void getAnalysisUsage(AnalysisUsage &AU) const {
70 AU.addRequiredTransitive<CallGraph>();
72 virtual bool runOnModule(Module &M) { return false; }
74 virtual void print(std::ostream &OS, const Module *M) const {
75 getAnalysis<CallGraph>().print(OS, M);
79 RegisterPass<CallGraphPrinter>
80 P2("callgraph", "Print a call graph");