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"
23using namespace llvm;
24
25STATISTIC(TotalInsts , "Number of instructions (of all types)");
26STATISTIC(TotalBlocks, "Number of basic blocks");
27STATISTIC(TotalFuncs , "Number of non-external functions");
28STATISTIC(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
36namespace {
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
68char InstCount::ID = 0;
69INITIALIZE_PASS(InstCount, "instcount",
70                "Counts the various types of Instructions", false, true)
71
72FunctionPass *llvm::createInstCountPass() { return new InstCount(); }
73
74// InstCount::run - This is the main Analysis entry point for a
75// function.
76//
77bool 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