tools/analyze/analyze.cpp

   1 //===- analyze.cpp - The LLVM analyze utility -----------------------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   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.
   7 //
   8 //===----------------------------------------------------------------------===//
   9 //
  10 // This utility is designed to print out the results of running various analysis
  11 // passes on a program.  This is useful for understanding a program, or for
  12 // debugging an analysis pass.
  13 //
  14 //  analyze --help           - Output information about command line switches
  15 //  analyze --quiet          - Do not print analysis name before output
  16 //
  17 //===----------------------------------------------------------------------===//
  18
  19 #include "llvm/Module.h"
  20 #include "llvm/PassManager.h"
  21 #include "llvm/Bytecode/Reader.h"
  22 #include "llvm/Assembly/Parser.h"
  23 #include "llvm/Analysis/Verifier.h"
  24 #include "llvm/Target/TargetData.h"
  25 #include "llvm/Support/PassNameParser.h"
  26 #include "Support/Signals.h"
  27 #include "Support/Timer.h"
  28 #include <algorithm>
  29
  30 using namespace llvm;
  31
  32 struct ModulePassPrinter : public Pass {
  33   const PassInfo *PassToPrint;
  34   ModulePassPrinter(const PassInfo *PI) : PassToPrint(PI) {}
  35
  36   virtual bool run(Module &M) {
  37     std::cout << "Printing analysis '" << PassToPrint->getPassName() << "':\n";
  38     getAnalysisID<Pass>(PassToPrint).print(std::cout, &M);
  39
  40     // Get and print pass...
  41     return false;
  42   }
  43
  44   virtual const char *getPassName() const { return "'Pass' Printer"; }
  45
  46   virtual void getAnalysisUsage(AnalysisUsage &AU) const {
  47     AU.addRequiredID(PassToPrint);
  48     AU.setPreservesAll();
  49   }
  50 };
  51
  52 struct FunctionPassPrinter : public FunctionPass {
  53   const PassInfo *PassToPrint;
  54   FunctionPassPrinter(const PassInfo *PI) : PassToPrint(PI) {}
  55
  56   virtual bool runOnFunction(Function &F) {
  57     std::cout << "Printing analysis '" << PassToPrint->getPassName()
  58               << "' for function '" << F.getName() << "':\n";
  59     getAnalysisID<Pass>(PassToPrint).print(std::cout, F.getParent());
  60
  61     // Get and print pass...
  62     return false;
  63   }
  64
  65   virtual const char *getPassName() const { return "FunctionPass Printer"; }
  66
  67   virtual void getAnalysisUsage(AnalysisUsage &AU) const {
  68     AU.addRequiredID(PassToPrint);
  69     AU.setPreservesAll();
  70   }
  71 };
  72
  73 struct BasicBlockPassPrinter : public BasicBlockPass {
  74   const PassInfo *PassToPrint;
  75   BasicBlockPassPrinter(const PassInfo *PI) : PassToPrint(PI) {}
  76
  77   virtual bool runOnBasicBlock(BasicBlock &BB) {
  78     std::cout << "Printing Analysis info for BasicBlock '" << BB.getName()
  79               << "': Pass " << PassToPrint->getPassName() << ":\n";
  80     getAnalysisID<Pass>(PassToPrint).print(std::cout, BB.getParent()->getParent());
  81
  82     // Get and print pass...
  83     return false;
  84   }
  85
  86   virtual const char *getPassName() const { return "BasicBlockPass Printer"; }
  87
  88   virtual void getAnalysisUsage(AnalysisUsage &AU) const {
  89     AU.addRequiredID(PassToPrint);
  90     AU.setPreservesAll();
  91   }
  92 };
  93
  94
  95
  96 namespace {
  97   cl::opt<std::string>
  98   InputFilename(cl::Positional, cl::desc("<input file>"), cl::init("-"),
  99                 cl::value_desc("filename"));
 100
 101   cl::opt<bool> Quiet("q", cl::desc("Don't print analysis pass names"));
 102   cl::alias    QuietA("quiet", cl::desc("Alias for -q"),
 103                       cl::aliasopt(Quiet));
 104
 105   cl::opt<bool> NoVerify("disable-verify", cl::Hidden,
 106                          cl::desc("Do not verify input module"));
 107
 108   // The AnalysesList is automatically populated with registered Passes by the
 109   // PassNameParser.
 110   //
 111   cl::list<const PassInfo*, bool, FilteredPassNameParser<PassInfo::Analysis> >
 112   AnalysesList(cl::desc("Analyses available:"));
 113
 114   Timer BytecodeLoadTimer("Bytecode Loader");
 115 }
 116
 117 int main(int argc, char **argv) {
 118   cl::ParseCommandLineOptions(argc, argv, " llvm analysis printer tool\n");
 119   PrintStackTraceOnErrorSignal();
 120
 121   Module *CurMod = 0;
 122   try {
 123 #if 0
 124     TimeRegion RegionTimer(BytecodeLoadTimer);
 125 #endif
 126     CurMod = ParseBytecodeFile(InputFilename);
 127     if (!CurMod && !(CurMod = ParseAssemblyFile(InputFilename))){
 128       std::cerr << argv[0] << ": input file didn't read correctly.\n";
 129       return 1;
 130     }
 131   } catch (const ParseException &E) {
 132     std::cerr << argv[0] << ": " << E.getMessage() << "\n";
 133     return 1;
 134   }
 135
 136   // Create a PassManager to hold and optimize the collection of passes we are
 137   // about to build...
 138   //
 139   PassManager Passes;
 140
 141   // Add an appropriate TargetData instance for this module...
 142   Passes.add(new TargetData("analyze", CurMod));
 143
 144   // Make sure the input LLVM is well formed.
 145   if (!NoVerify)
 146     Passes.add(createVerifierPass());
 147
 148   // Create a new optimization pass for each one specified on the command line
 149   for (unsigned i = 0; i < AnalysesList.size(); ++i) {
 150     const PassInfo *Analysis = AnalysesList[i];
 151
 152     if (Analysis->getNormalCtor()) {
 153       Pass *P = Analysis->getNormalCtor()();
 154       Passes.add(P);
 155
 156       if (BasicBlockPass *BBP = dynamic_cast<BasicBlockPass*>(P))
 157         Passes.add(new BasicBlockPassPrinter(Analysis));
 158       else if (FunctionPass *FP = dynamic_cast<FunctionPass*>(P))
 159         Passes.add(new FunctionPassPrinter(Analysis));
 160       else
 161         Passes.add(new ModulePassPrinter(Analysis));
 162
 163     } else
 164       std::cerr << argv[0] << ": cannot create pass: "
 165                 << Analysis->getPassName() << "\n";
 166   }
 167
 168   Passes.run(*CurMod);
 169
 170   delete CurMod;
 171   return 0;
 172 }