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/Debug.h"
  19 #include "llvm/Support/ErrorHandling.h"
  20 #include "llvm/Support/InstVisitor.h"
  21 #include "llvm/Support/raw_ostream.h"
  22 #include "llvm/ADT/Statistic.h"
  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 InstCount : public FunctionPass, public InstVisitor<InstCount> {
  38     friend class InstVisitor<InstCount>;
  39
  40     void visitFunction  (Function &F) { ++TotalFuncs; }
  41     void visitBasicBlock(BasicBlock &BB) { ++TotalBlocks; }
  42
  43 #define HANDLE_INST(N, OPCODE, CLASS) \
  44     void visit##OPCODE(CLASS &) { ++Num##OPCODE##Inst; ++TotalInsts; }
  45
  46 #include "llvm/Instruction.def"
  47
  48     void visitInstruction(Instruction &I) {
  49       errs() << "Instruction Count does not know about " << I;
  50       llvm_unreachable(0);
  51     }
  52   public:
  53     static char ID; // Pass identification, replacement for typeid
  54     InstCount() : FunctionPass(ID) {
  55       initializeInstCountPass(*PassRegistry::getPassRegistry());
  56     }
  57
  58     virtual bool runOnFunction(Function &F);
  59
  60     virtual void getAnalysisUsage(AnalysisUsage &AU) const {
  61       AU.setPreservesAll();
  62     }
  63     virtual void print(raw_ostream &O, const Module *M) const {}
  64
  65   };
  66 }
  67
  68 char InstCount::ID = 0;
  69 INITIALIZE_PASS(InstCount, "instcount",
  70                 "Counts the various types of Instructions", false, true)
  71
  72 FunctionPass *llvm::createInstCountPass() { return new InstCount(); }
  73
  74 // InstCount::run - This is the main Analysis entry point for a
  75 // function.
  76 //
  77 bool InstCount::runOnFunction(Function &F) {
  78   unsigned StartMemInsts =
  79     NumGetElementPtrInst + NumLoadInst + NumStoreInst + NumCallInst +
  80     NumInvokeInst + NumAllocaInst;
  81   visit(F);
  82   unsigned EndMemInsts =
  83     NumGetElementPtrInst + NumLoadInst + NumStoreInst + NumCallInst +
  84     NumInvokeInst + NumAllocaInst;
  85   TotalMemInst += EndMemInsts-StartMemInsts;
  86   return false;
  87 }