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/InitializePasses.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"
22using namespace llvm;
23
24#define DEBUG_TYPE "instcount"
25
26STATISTIC(TotalInsts , "Number of instructions (of all types)");
27STATISTIC(TotalBlocks, "Number of basic blocks");
28STATISTIC(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
35namespace {
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
67char InstCount::ID = 0;
68INITIALIZE_PASS(InstCount, "instcount",
69                "Counts the various types of Instructions", false, true)
70
71FunctionPass *llvm::createInstCountPass() { return new InstCount(); }
72
73// InstCount::run - This is the main Analysis entry point for a
74// function.
75//
76bool InstCount::runOnFunction(Function &F) {
77  visit(F);
78  return false;
79}
80