InstCount.cpp revision a276c603b82a11b0bf0b59f0517a69e4b63adeab 
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/Compiler.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 VISIBILITY_HIDDEN InstCount
38      : public FunctionPass, public InstVisitor<InstCount> {
39    friend class InstVisitor<InstCount>;
40
41    void visitFunction  (Function &F) { ++TotalFuncs; }
42    void visitBasicBlock(BasicBlock &BB) { ++TotalBlocks; }
43
44#define HANDLE_INST(N, OPCODE, CLASS) \
45    void visit##OPCODE(CLASS &) { ++Num##OPCODE##Inst; ++TotalInsts; }
46
47#include "llvm/Instruction.def"
48
49    void visitInstruction(Instruction &I) {
50      errs() << "Instruction Count does not know about " << I;
51      llvm_unreachable(0);
52    }
53  public:
54    static char ID; // Pass identification, replacement for typeid
55    InstCount() : FunctionPass(&ID) {}
56
57    virtual bool runOnFunction(Function &F);
58
59    virtual void getAnalysisUsage(AnalysisUsage &AU) const {
60      AU.setPreservesAll();
61    }
62    virtual void print(raw_ostream &O, const Module *M) const {}
63
64  };
65}
66
67char InstCount::ID = 0;
68static RegisterPass<InstCount>
69X("instcount", "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  unsigned StartMemInsts =
78    NumGetElementPtrInst + NumLoadInst + NumStoreInst + NumCallInst +
79    NumInvokeInst + NumAllocaInst + NumFreeInst;
80  visit(F);
81  unsigned EndMemInsts =
82    NumGetElementPtrInst + NumLoadInst + NumStoreInst + NumCallInst +
83    NumInvokeInst + NumAllocaInst + NumFreeInst;
84  TotalMemInst += EndMemInsts-StartMemInsts;
85  return false;
86}
87