InstCount.cpp revision 270862dad4d12da5fd7f030210a9d66c8247d0cb 
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/Pass.h"
17#include "llvm/Function.h"
18#include "llvm/Support/Debug.h"
19#include "llvm/Support/ErrorHandling.h"
20#include "llvm/Support/InstVisitor.h"
21#include "llvm/Support/raw_ostream.h"
22#include "llvm/ADT/Statistic.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/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/Instruction.def"
47
48    void visitInstruction(Instruction &I) {
49      dbgs() << "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
56    virtual bool runOnFunction(Function &F);
57
58    virtual void getAnalysisUsage(AnalysisUsage &AU) const {
59      AU.setPreservesAll();
60    }
61    virtual void print(raw_ostream &O, const Module *M) const {}
62
63  };
64}
65
66char InstCount::ID = 0;
67static RegisterPass<InstCount>
68X("instcount", "Counts the various types of Instructions", false, true);
69
70FunctionPass *llvm::createInstCountPass() { return new InstCount(); }
71
72// InstCount::run - This is the main Analysis entry point for a
73// function.
74//
75bool InstCount::runOnFunction(Function &F) {
76  unsigned StartMemInsts =
77    NumGetElementPtrInst + NumLoadInst + NumStoreInst + NumCallInst +
78    NumInvokeInst + NumAllocaInst;
79  visit(F);
80  unsigned EndMemInsts =
81    NumGetElementPtrInst + NumLoadInst + NumStoreInst + NumCallInst +
82    NumInvokeInst + NumAllocaInst;
83  TotalMemInst += EndMemInsts-StartMemInsts;
84  return false;
85}
86