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/ErrorHandling.h"
19 #include "llvm/Support/InstVisitor.h"
20 #include "llvm/Support/raw_ostream.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 InstCount : public FunctionPass, public InstVisitor<InstCount> {
37     friend class InstVisitor<InstCount>;
38 
39     void visitFunction  (Function &F) { ++TotalFuncs; }
40     void visitBasicBlock(BasicBlock &BB) { ++TotalBlocks; }
41 
42 #define HANDLE_INST(N, OPCODE, CLASS) \
43     void visit##OPCODE(CLASS &) { ++Num##OPCODE##Inst; ++TotalInsts; }
44 
45 #include "llvm/Instruction.def"
46 
47     void visitInstruction(Instruction &I) {
48       errs() << "Instruction Count does not know about " << I;
49       llvm_unreachable(0);
50     }
51   public:
52     static char ID; // Pass identification, replacement for typeid
53     InstCount() : FunctionPass(&ID) {}
54 
55     virtual bool runOnFunction(Function &F);
56 
57     virtual void getAnalysisUsage(AnalysisUsage &AU) const {
58       AU.setPreservesAll();
59     }
60     virtual void print(raw_ostream &O, const Module *M) const {}
61 
62   };
63 }
64 
65 char InstCount::ID = 0;
66 static RegisterPass<InstCount>
67 X("instcount", "Counts the various types of Instructions", false, true);
68 
69 FunctionPass *llvm::createInstCountPass() { return new InstCount(); }
70 
71 // InstCount::run - This is the main Analysis entry point for a
72 // function.
73 //
74 bool InstCount::runOnFunction(Function &F) {
75   unsigned StartMemInsts =
76     NumGetElementPtrInst + NumLoadInst + NumStoreInst + NumCallInst +
77     NumInvokeInst + NumAllocaInst;
78   visit(F);
79   unsigned EndMemInsts =
80     NumGetElementPtrInst + NumLoadInst + NumStoreInst + NumCallInst +
81     NumInvokeInst + NumAllocaInst;
82   TotalMemInst += EndMemInsts-StartMemInsts;
83   return false;
84 }
85