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"
29 /// ExternalFunctionsPassedConstants - This pass prints out call sites to
30 /// external functions that are called with constant arguments. This can be
31 /// useful when looking for standard library functions we should constant fold
32 /// or handle in alias analyses.
33 struct ExternalFunctionsPassedConstants : public ModulePass {
34 static char ID; // Pass ID, replacement for typeid
35 ExternalFunctionsPassedConstants() : ModulePass(&ID) {}
36 virtual bool runOnModule(Module &M) {
37 for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
38 if (I->isDeclaration()) {
39 bool PrintedFn = false;
40 for (Value::use_iterator UI = I->use_begin(), E = I->use_end();
42 if (Instruction *User = dyn_cast<Instruction>(*UI)) {
43 CallSite CS = CallSite::get(User);
44 if (CS.getInstruction()) {
45 for (CallSite::arg_iterator AI = CS.arg_begin(),
46 E = CS.arg_end(); AI != E; ++AI)
47 if (isa<Constant>(*AI)) {
49 errs() << "Function '" << I->getName() << "':\n";
62 virtual void getAnalysisUsage(AnalysisUsage &AU) const {
67 char ExternalFunctionsPassedConstants::ID = 0;
68 RegisterPass<ExternalFunctionsPassedConstants>
69 P1("print-externalfnconstants",
70 "Print external fn callsites passed constants");
72 struct CallGraphPrinter : public ModulePass {
73 static char ID; // Pass ID, replacement for typeid
74 CallGraphPrinter() : ModulePass(&ID) {}
76 virtual void getAnalysisUsage(AnalysisUsage &AU) const {
78 AU.addRequiredTransitive<CallGraph>();
80 virtual bool runOnModule(Module &M) {
81 getAnalysis<CallGraph>().print(std::cerr, &M);
86 char CallGraphPrinter::ID = 0;
87 RegisterPass<CallGraphPrinter>
88 P2("print-callgraph", "Print a call graph");