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/Analysis/Passes.h" 15 #include "llvm/ADT/Statistic.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 STATISTIC(TotalMemInst, "Number of memory instructions"); 30 31 #define HANDLE_INST(N, OPCODE, CLASS) \ 32 STATISTIC(Num ## OPCODE ## Inst, "Number of " #OPCODE " insts"); 33 34 #include "llvm/IR/Instruction.def" 35 36 37 namespace { 38 class InstCount : 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/IR/Instruction.def" 48 49 void visitInstruction(Instruction &I) { 50 errs() << "Instruction Count does not know about " << I; 51 llvm_unreachable(nullptr); 52 } 53 public: 54 static char ID; // Pass identification, replacement for typeid 55 InstCount() : FunctionPass(ID) { 56 initializeInstCountPass(*PassRegistry::getPassRegistry()); 57 } 58 59 bool runOnFunction(Function &F) override; 60 61 void getAnalysisUsage(AnalysisUsage &AU) const override { 62 AU.setPreservesAll(); 63 } 64 void print(raw_ostream &O, const Module *M) const override {} 65 66 }; 67 } 68 69 char InstCount::ID = 0; 70 INITIALIZE_PASS(InstCount, "instcount", 71 "Counts the various types of Instructions", false, true) 72 73 FunctionPass *llvm::createInstCountPass() { return new InstCount(); } 74 75 // InstCount::run - This is the main Analysis entry point for a 76 // function. 77 // 78 bool InstCount::runOnFunction(Function &F) { 79 unsigned StartMemInsts = 80 NumGetElementPtrInst + NumLoadInst + NumStoreInst + NumCallInst + 81 NumInvokeInst + NumAllocaInst; 82 visit(F); 83 unsigned EndMemInsts = 84 NumGetElementPtrInst + NumLoadInst + NumStoreInst + NumCallInst + 85 NumInvokeInst + NumAllocaInst; 86 TotalMemInst += EndMemInsts-StartMemInsts; 87 return false; 88 } 89
