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1 //===-- InstCount.cpp - Collects the count of all instructions ------------===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This pass collects the count of all instructions and reports them
10 //
11 //===----------------------------------------------------------------------===//
12
13 #include "llvm/ADT/Statistic.h"
14 #include "llvm/Analysis/Passes.h"
15 #include "llvm/IR/Function.h"
16 #include "llvm/IR/InstVisitor.h"
17 #include "llvm/Pass.h"
18 #include "llvm/Support/Debug.h"
19 #include "llvm/Support/ErrorHandling.h"
20 #include "llvm/Support/raw_ostream.h"
21 using namespace llvm;
22
23 #define DEBUG_TYPE "instcount"
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
29 #define HANDLE_INST(N, OPCODE, CLASS) \
30   STATISTIC(Num ## OPCODE ## Inst, "Number of " #OPCODE " insts");
31
32 #include "llvm/IR/Instruction.def"
33
34 namespace {
35   class InstCount : public FunctionPass, public InstVisitor<InstCount> {
36     friend class InstVisitor<InstCount>;
37
38     void visitFunction  (Function &F) { ++TotalFuncs; }
39     void visitBasicBlock(BasicBlock &BB) { ++TotalBlocks; }
40
41 #define HANDLE_INST(N, OPCODE, CLASS) \
42     void visit##OPCODE(CLASS &) { ++Num##OPCODE##Inst; ++TotalInsts; }
43
44 #include "llvm/IR/Instruction.def"
45
46     void visitInstruction(Instruction &I) {
47       errs() << "Instruction Count does not know about " << I;
48       llvm_unreachable(nullptr);
49     }
50   public:
51     static char ID; // Pass identification, replacement for typeid
52     InstCount() : FunctionPass(ID) {
53       initializeInstCountPass(*PassRegistry::getPassRegistry());
54     }
55
56     bool runOnFunction(Function &F) override;
57
58     void getAnalysisUsage(AnalysisUsage &AU) const override {
59       AU.setPreservesAll();
60     }
61     void print(raw_ostream &O, const Module *M) const override {}
62
63   };
64 }
65
66 char InstCount::ID = 0;
67 INITIALIZE_PASS(InstCount, "instcount",
68                 "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   visit(F);
77   return false;
78 }