lib/Analysis/InstCount.cpp

   1 //===-- InstCount.cpp - Collects the count of all instructions ------------===//
   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 pass collects the count of all instructions and reports them
  11 //
  12 //===----------------------------------------------------------------------===//
  13
  14 #include "llvm/Analysis/Passes.h"
  15 #include "llvm/Pass.h"
  16 #include "llvm/Function.h"
  17 #include "llvm/Support/InstVisitor.h"
  18 #include "llvm/ADT/Statistic.h"
  19 #include <iostream>
  20 using namespace llvm;
  21
  22 namespace {
  23   Statistic<> TotalInsts ("instcount", "Number of instructions (of all types)");
  24   Statistic<> TotalBlocks("instcount", "Number of basic blocks");
  25   Statistic<> TotalFuncs ("instcount", "Number of non-external functions");
  26   Statistic<> TotalMemInst("instcount", "Number of memory instructions");
  27
  28 #define HANDLE_INST(N, OPCODE, CLASS) \
  29     Statistic<> Num##OPCODE##Inst("instcount", "Number of " #OPCODE " insts");
  30
  31 #include "llvm/Instruction.def"
  32
  33   class InstCount : public FunctionPass, public InstVisitor<InstCount> {
  34     friend class InstVisitor<InstCount>;
  35
  36     void visitFunction  (Function &F) { ++TotalFuncs; }
  37     void visitBasicBlock(BasicBlock &BB) { ++TotalBlocks; }
  38
  39 #define HANDLE_INST(N, OPCODE, CLASS) \
  40     void visit##OPCODE(CLASS &) { ++Num##OPCODE##Inst; ++TotalInsts; }
  41
  42 #include "llvm/Instruction.def"
  43
  44     void visitInstruction(Instruction &I) {
  45       std::cerr << "Instruction Count does not know about " << I;
  46       abort();
  47     }
  48   public:
  49     virtual bool runOnFunction(Function &F);
  50
  51     virtual void getAnalysisUsage(AnalysisUsage &AU) const {
  52       AU.setPreservesAll();
  53     }
  54     virtual void print(std::ostream &O, const Module *M) const {}
  55
  56   };
  57
  58   RegisterAnalysis<InstCount> X("instcount",
  59                                 "Counts the various types of Instructions");
  60 }
  61
  62 FunctionPass *llvm::createInstCountPass() { return new InstCount(); }
  63
  64 // InstCount::run - This is the main Analysis entry point for a
  65 // function.
  66 //
  67 bool InstCount::runOnFunction(Function &F) {
  68   unsigned StartMemInsts =
  69     NumGetElementPtrInst + NumLoadInst + NumStoreInst + NumCallInst +
  70     NumInvokeInst + NumAllocaInst + NumMallocInst + NumFreeInst;
  71   visit(F);
  72   unsigned EndMemInsts =
  73     NumGetElementPtrInst + NumLoadInst + NumStoreInst + NumCallInst +
  74     NumInvokeInst + NumAllocaInst + NumMallocInst + NumFreeInst;
  75   TotalMemInst += EndMemInsts-StartMemInsts;
  76   return false;
  77 }