lib/Analysis/InstCount.cpp

   1 //===-- InstCount.cpp - Collects the count of all instructions ------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8 //
   9 // This pass collects the count of all instructions and reports them
  10 //
  11 //===----------------------------------------------------------------------===//
  12
  13 #include "llvm/ADT/Statistic.h"
  14 #include "llvm/Analysis/Passes.h"
  15 #include "llvm/IR/Function.h"
  16 #include "llvm/IR/InstVisitor.h"
  17 #include "llvm/Pass.h"
  18 #include "llvm/Support/Debug.h"
  19 #include "llvm/Support/ErrorHandling.h"
  20 #include "llvm/Support/raw_ostream.h"
  21 using namespace llvm;
  22
  23 #define DEBUG_TYPE "instcount"
  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
  29 #define HANDLE_INST(N, OPCODE, CLASS) \
  30   STATISTIC(Num ## OPCODE ## Inst, "Number of " #OPCODE " insts");
  31
  32 #include "llvm/IR/Instruction.def"
  33
  34 namespace {
  35   class InstCount : public FunctionPass, public InstVisitor<InstCount> {
  36     friend class InstVisitor<InstCount>;
  37
  38     void visitFunction  (Function &F) { ++TotalFuncs; }
  39     void visitBasicBlock(BasicBlock &BB) { ++TotalBlocks; }
  40
  41 #define HANDLE_INST(N, OPCODE, CLASS) \
  42     void visit##OPCODE(CLASS &) { ++Num##OPCODE##Inst; ++TotalInsts; }
  43
  44 #include "llvm/IR/Instruction.def"
  45
  46     void visitInstruction(Instruction &I) {
  47       errs() << "Instruction Count does not know about " << I;
  48       llvm_unreachable(nullptr);
  49     }
  50   public:
  51     static char ID; // Pass identification, replacement for typeid
  52     InstCount() : FunctionPass(ID) {
  53       initializeInstCountPass(*PassRegistry::getPassRegistry());
  54     }
  55
  56     bool runOnFunction(Function &F) override;
  57
  58     void getAnalysisUsage(AnalysisUsage &AU) const override {
  59       AU.setPreservesAll();
  60     }
  61     void print(raw_ostream &O, const Module *M) const override {}
  62
  63   };
  64 }
  65
  66 char InstCount::ID = 0;
  67 INITIALIZE_PASS(InstCount, "instcount",
  68                 "Counts the various types of Instructions", false, true)
  69
  70 FunctionPass *llvm::createInstCountPass() { return new InstCount(); }
  71
  72 // InstCount::run - This is the main Analysis entry point for a
  73 // function.
  74 //
  75 bool InstCount::runOnFunction(Function &F) {
  76   visit(F);
  77   return false;
  78 }