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/InstVisitor.h"
20 #include "llvm/Support/Streams.h"
21 #include "llvm/ADT/Statistic.h"
22 using namespace llvm;
23 
24 STATISTIC(TotalInsts , "Number of instructions (of all types)");
25 STATISTIC(TotalBlocks, "Number of basic blocks");
26 STATISTIC(TotalFuncs , "Number of non-external functions");
27 STATISTIC(TotalMemInst, "Number of memory instructions");
28 
29 #define HANDLE_INST(N, OPCODE, CLASS) \
30   STATISTIC(Num ## OPCODE ## Inst, "Number of " #OPCODE " insts");
31 
32 #include "llvm/Instruction.def"
33 
34 
35 namespace {
36   class VISIBILITY_HIDDEN InstCount
37       : 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       cerr << "Instruction Count does not know about " << I;
50       abort();
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(std::ostream &O, const Module *M) const {}
62 
63   };
64 }
65 
66 char InstCount::ID = 0;
67 static RegisterPass<InstCount>
68 X("instcount", "Counts the various types of Instructions", false, true);
69 
70 FunctionPass *llvm::createInstCountPass() { return new InstCount(); }
71 
72 // InstCount::run - This is the main Analysis entry point for a
73 // function.
74 //
75 bool InstCount::runOnFunction(Function &F) {
76   unsigned StartMemInsts =
77     NumGetElementPtrInst + NumLoadInst + NumStoreInst + NumCallInst +
78     NumInvokeInst + NumAllocaInst + NumMallocInst + NumFreeInst;
79   visit(F);
80   unsigned EndMemInsts =
81     NumGetElementPtrInst + NumLoadInst + NumStoreInst + NumCallInst +
82     NumInvokeInst + NumAllocaInst + NumMallocInst + NumFreeInst;
83   TotalMemInst += EndMemInsts-StartMemInsts;
84   return false;
85 }
86