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 #include "llvm/ADT/Statistic.h"
  15 #include "llvm/Analysis/Passes.h"
  16 #include "llvm/IR/Function.h"
  17 #include "llvm/IR/InstVisitor.h"
  18 #include "llvm/Pass.h"
  19 #include "llvm/Support/Debug.h"
  20 #include "llvm/Support/ErrorHandling.h"
  21 #include "llvm/Support/raw_ostream.h"
  22 using namespace llvm;
  23
  24 #define DEBUG_TYPE "instcount"
  25
  26 STATISTIC(TotalInsts , "Number of instructions (of all types)");
  27 STATISTIC(TotalBlocks, "Number of basic blocks");
  28 STATISTIC(TotalFuncs , "Number of non-external functions");
  29
  30 #define HANDLE_INST(N, OPCODE, CLASS) \
  31   STATISTIC(Num ## OPCODE ## Inst, "Number of " #OPCODE " insts");
  32
  33 #include "llvm/IR/Instruction.def"
  34
  35 namespace {
  36   class InstCount : public FunctionPass, public InstVisitor<InstCount> {
  37     friend class InstVisitor<InstCount>;
  38
  39     void visitFunction  (Function &F) { ++TotalFuncs; }
  40     void visitBasicBlock(BasicBlock &BB) { ++TotalBlocks; }
  41
  42 #define HANDLE_INST(N, OPCODE, CLASS) \
  43     void visit##OPCODE(CLASS &) { ++Num##OPCODE##Inst; ++TotalInsts; }
  44
  45 #include "llvm/IR/Instruction.def"
  46
  47     void visitInstruction(Instruction &I) {
  48       errs() << "Instruction Count does not know about " << I;
  49       llvm_unreachable(nullptr);
  50     }
  51   public:
  52     static char ID; // Pass identification, replacement for typeid
  53     InstCount() : FunctionPass(ID) {
  54       initializeInstCountPass(*PassRegistry::getPassRegistry());
  55     }
  56
  57     bool runOnFunction(Function &F) override;
  58
  59     void getAnalysisUsage(AnalysisUsage &AU) const override {
  60       AU.setPreservesAll();
  61     }
  62     void print(raw_ostream &O, const Module *M) const override {}
  63
  64   };
  65 }
  66
  67 char InstCount::ID = 0;
  68 INITIALIZE_PASS(InstCount, "instcount",
  69                 "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   visit(F);
  78   return false;
  79 }