1 //===-- InstCount.cpp - Collects the count of all instructions ------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source 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 #include "llvm/Pass.h"
15 #include "llvm/Function.h"
16 #include "llvm/Support/InstVisitor.h"
17 #include "llvm/ADT/Statistic.h"
18 using namespace llvm;
19 
20 namespace {
21   Statistic<> TotalInsts ("instcount", "Number of instructions (of all types)");
22   Statistic<> TotalBlocks("instcount", "Number of basic blocks");
23   Statistic<> TotalFuncs ("instcount", "Number of non-external functions");
24   Statistic<> TotalMemInst("instcount", "Number of memory instructions");
25 
26 #define HANDLE_INST(N, OPCODE, CLASS) \
27     Statistic<> Num##OPCODE##Inst("instcount", "Number of " #OPCODE " insts");
28 
29 #include "llvm/Instruction.def"
30 
31   class InstCount : public FunctionPass, public InstVisitor<InstCount> {
32     friend class InstVisitor<InstCount>;
33 
34     void visitFunction  (Function &F) { ++TotalFuncs; }
35     void visitBasicBlock(BasicBlock &BB) { ++TotalBlocks; }
36 
37 #define HANDLE_INST(N, OPCODE, CLASS) \
38     void visit##OPCODE(CLASS &) { ++Num##OPCODE##Inst; ++TotalInsts; }
39 
40 #include "llvm/Instruction.def"
41 
42     void visitInstruction(Instruction &I) {
43       std::cerr << "Instruction Count does not know about " << I;
44       abort();
45     }
46   public:
47     virtual bool runOnFunction(Function &F);
48 
49     virtual void getAnalysisUsage(AnalysisUsage &AU) const {
50       AU.setPreservesAll();
51     }
52     virtual void print(std::ostream &O, const Module *M) const {}
53 
54   };
55 
56   RegisterAnalysis<InstCount> X("instcount",
57                                 "Counts the various types of Instructions");
58 }
59 
60 // InstCount::run - This is the main Analysis entry point for a
61 // function.
62 //
63 bool InstCount::runOnFunction(Function &F) {
64   unsigned StartMemInsts =
65     NumGetElementPtrInst + NumLoadInst + NumStoreInst + NumCallInst +
66     NumInvokeInst + NumAllocaInst + NumMallocInst + NumFreeInst;
67   visit(F);
68   unsigned EndMemInsts =
69     NumGetElementPtrInst + NumLoadInst + NumStoreInst + NumCallInst +
70     NumInvokeInst + NumAllocaInst + NumMallocInst + NumFreeInst;
71   TotalMemInst += EndMemInsts-StartMemInsts;
72   return false;
73 }
74