llvm/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/Analysis/InstCount.h"
  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/InitializePasses.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 #define DEBUG_TYPE "instcount"
  26
  27 STATISTIC(TotalInsts, "Number of instructions (of all types)");
  28 STATISTIC(TotalBlocks, "Number of basic blocks");
  29 STATISTIC(TotalFuncs, "Number of non-external functions");
  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 namespace {
  37 class InstCount : 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 &) {                                                \
  45     ++Num##OPCODE##Inst;                                                       \
  46     ++TotalInsts;                                                              \
  47   }
  48
  49 #include "llvm/IR/Instruction.def"
  50
  51   void visitInstruction(Instruction &I) {
  52     errs() << "Instruction Count does not know about " << I;
  53     llvm_unreachable(nullptr);
  54   }
  55 };
  56 } // namespace
  57
  58 PreservedAnalyses InstCountPass::run(Function &F,
  59                                      FunctionAnalysisManager &FAM) {
  60   LLVM_DEBUG(dbgs() << "INSTCOUNT: running on function " << F.getName()
  61                     << "\n");
  62   InstCount().visit(F);
  63
  64   return PreservedAnalyses::all();
  65 }
  66
  67 namespace {
  68 class InstCountLegacyPass : public FunctionPass {
  69 public:
  70   static char ID; // Pass identification, replacement for typeid
  71   InstCountLegacyPass() : FunctionPass(ID) {
  72     initializeInstCountLegacyPassPass(*PassRegistry::getPassRegistry());
  73   }
  74
  75   bool runOnFunction(Function &F) override {
  76     LLVM_DEBUG(dbgs() << "INSTCOUNT: running on function " << F.getName()
  77                       << "\n");
  78     InstCount().visit(F);
  79     return false;
  80   };
  81
  82   void getAnalysisUsage(AnalysisUsage &AU) const override {
  83     AU.setPreservesAll();
  84   }
  85
  86   void print(raw_ostream &O, const Module *M) const override {}
  87 };
  88 } // namespace
  89
  90 char InstCountLegacyPass::ID = 0;
  91 INITIALIZE_PASS(InstCountLegacyPass, "instcount",
  92                 "Counts the various types of Instructions", false, true)
  93
  94 FunctionPass *llvm::createInstCountPass() { return new InstCountLegacyPass(); }