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"
23 using namespace llvm;
24 
25 STATISTIC(TotalInsts , "Number of instructions (of all types)");
26 STATISTIC(TotalBlocks, "Number of basic blocks");
27 STATISTIC(TotalFuncs , "Number of non-external functions");
28 STATISTIC(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 
36 namespace {
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 
67 char InstCount::ID = 0;
68 static RegisterPass<InstCount>
69 X("instcount", "Counts the various types of Instructions", false, true);
70 
71 FunctionPass *llvm::createInstCountPass() { return new InstCount(); }
72 
73 // InstCount::run - This is the main Analysis entry point for a
74 // function.
75 //
76 bool InstCount::runOnFunction(Function &F) {
77   unsigned StartMemInsts =
78     NumGetElementPtrInst + NumLoadInst + NumStoreInst + NumCallInst +
79     NumInvokeInst + NumAllocaInst + NumMallocInst + NumFreeInst;
80   visit(F);
81   unsigned EndMemInsts =
82     NumGetElementPtrInst + NumLoadInst + NumStoreInst + NumCallInst +
83     NumInvokeInst + NumAllocaInst + NumMallocInst + NumFreeInst;
84   TotalMemInst += EndMemInsts-StartMemInsts;
85   return false;
86 }
87