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 #include "llvm/Analysis/Passes.h"
15 #include "llvm/ADT/Statistic.h"
16 #include "llvm/IR/Function.h"
17 #include "llvm/IR/InstVisitor.h"
18 #include "llvm/Pass.h"
19 #include "llvm/Support/Debug.h"
20 #include "llvm/Support/ErrorHandling.h"
21 #include "llvm/Support/raw_ostream.h"
22 using namespace llvm;
23
24 #define DEBUG_TYPE "instcount"
25
26 STATISTIC(TotalInsts , "Number of instructions (of all types)");
27 STATISTIC(TotalBlocks, "Number of basic blocks");
28 STATISTIC(TotalFuncs , "Number of non-external functions");
29 STATISTIC(TotalMemInst, "Number of memory instructions");
30
31 #define HANDLE_INST(N, OPCODE, CLASS) \
32 STATISTIC(Num ## OPCODE ## Inst, "Number of " #OPCODE " insts");
33
34 #include "llvm/IR/Instruction.def"
35
36
37 namespace {
38 class InstCount : public FunctionPass, public InstVisitor<InstCount> {
39 friend class InstVisitor<InstCount>;
40
visitFunction(Function & F)41 void visitFunction (Function &F) { ++TotalFuncs; }
visitBasicBlock(BasicBlock & BB)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/IR/Instruction.def"
48
visitInstruction(Instruction & I)49 void visitInstruction(Instruction &I) {
50 errs() << "Instruction Count does not know about " << I;
51 llvm_unreachable(nullptr);
52 }
53 public:
54 static char ID; // Pass identification, replacement for typeid
InstCount()55 InstCount() : FunctionPass(ID) {
56 initializeInstCountPass(*PassRegistry::getPassRegistry());
57 }
58
59 bool runOnFunction(Function &F) override;
60
getAnalysisUsage(AnalysisUsage & AU) const61 void getAnalysisUsage(AnalysisUsage &AU) const override {
62 AU.setPreservesAll();
63 }
print(raw_ostream & O,const Module * M) const64 void print(raw_ostream &O, const Module *M) const override {}
65
66 };
67 }
68
69 char InstCount::ID = 0;
70 INITIALIZE_PASS(InstCount, "instcount",
71 "Counts the various types of Instructions", false, true)
72
createInstCountPass()73 FunctionPass *llvm::createInstCountPass() { return new InstCount(); }
74
75 // InstCount::run - This is the main Analysis entry point for a
76 // function.
77 //
runOnFunction(Function & F)78 bool InstCount::runOnFunction(Function &F) {
79 unsigned StartMemInsts =
80 NumGetElementPtrInst + NumLoadInst + NumStoreInst + NumCallInst +
81 NumInvokeInst + NumAllocaInst;
82 visit(F);
83 unsigned EndMemInsts =
84 NumGetElementPtrInst + NumLoadInst + NumStoreInst + NumCallInst +
85 NumInvokeInst + NumAllocaInst;
86 TotalMemInst += EndMemInsts-StartMemInsts;
87 return false;
88 }
89