lib/Analysis/InstCount.cpp

   1 //===-- InstCount.cpp - Collects the count of all instructions ------------===//
   2 //
   3 //                     The LLVM Compiler Infrastructure
   4 //
   5 // This file is distributed under the University of Illinois Open Source
   6 // 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 #define DEBUG_TYPE "instcount"
  15 #include "llvm/Analysis/Passes.h"
  16 #include "llvm/Pass.h"
  17 #include "llvm/Function.h"
  18 #include "llvm/Support/Compiler.h"
  19 #include "llvm/Support/InstVisitor.h"
  20 #include "llvm/Support/Streams.h"
  21 #include "llvm/ADT/Statistic.h"
  22 #include <ostream>
  23 using namespace llvm;
  24
  25 STATISTIC(TotalInsts , "Number of instructions (of all types)");
  26 STATISTIC(TotalBlocks, "Number of basic blocks");
  27 STATISTIC(TotalFuncs , "Number of non-external functions");
  28 STATISTIC(TotalMemInst, "Number of memory instructions");
  29
  30 #define HANDLE_INST(N, OPCODE, CLASS) \
  31   STATISTIC(Num ## OPCODE ## Inst, "Number of " #OPCODE " insts");
  32
  33 #include "llvm/Instruction.def"
  34
  35
  36 namespace {
  37   class VISIBILITY_HIDDEN InstCount
  38       : public FunctionPass, public InstVisitor<InstCount> {
  39     friend class InstVisitor<InstCount>;
  40
  41     void visitFunction  (Function &F) { ++TotalFuncs; }
  42     void visitBasicBlock(BasicBlock &BB) { ++TotalBlocks; }
  43
  44 #define HANDLE_INST(N, OPCODE, CLASS) \
  45     void visit##OPCODE(CLASS &) { ++Num##OPCODE##Inst; ++TotalInsts; }
  46
  47 #include "llvm/Instruction.def"
  48
  49     void visitInstruction(Instruction &I) {
  50       cerr << "Instruction Count does not know about " << I;
  51       abort();
  52     }
  53   public:
  54     static char ID; // Pass identification, replacement for typeid
  55     InstCount() : FunctionPass(&ID) {}
  56
  57     virtual bool runOnFunction(Function &F);
  58
  59     virtual void getAnalysisUsage(AnalysisUsage &AU) const {
  60       AU.setPreservesAll();
  61     }
  62     virtual void print(std::ostream &O, const Module *M) const {}
  63
  64   };
  65 }
  66
  67 char InstCount::ID = 0;
  68 static RegisterPass<InstCount>
  69 X("instcount", "Counts the various types of Instructions", false, true);
  70
  71 FunctionPass *llvm::createInstCountPass() { return new InstCount(); }
  72
  73 // InstCount::run - This is the main Analysis entry point for a
  74 // function.
  75 //
  76 bool InstCount::runOnFunction(Function &F) {
  77   unsigned StartMemInsts =
  78     NumGetElementPtrInst + NumLoadInst + NumStoreInst + NumCallInst +
  79     NumInvokeInst + NumAllocaInst + NumMallocInst + NumFreeInst;
  80   visit(F);
  81   unsigned EndMemInsts =
  82     NumGetElementPtrInst + NumLoadInst + NumStoreInst + NumCallInst +
  83     NumInvokeInst + NumAllocaInst + NumMallocInst + NumFreeInst;
  84   TotalMemInst += EndMemInsts-StartMemInsts;
  85   return false;
  86 }