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      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/ADT/Statistic.h"
     17 #include "llvm/IR/Function.h"
     18 #include "llvm/InstVisitor.h"
     19 #include "llvm/Pass.h"
     20 #include "llvm/Support/Debug.h"
     21 #include "llvm/Support/ErrorHandling.h"
     22 #include "llvm/Support/raw_ostream.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/IR/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/IR/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 }
     88