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/Analysis/InstCount.h"
14 #include "llvm/ADT/Statistic.h"
15 #include "llvm/Analysis/Passes.h"
16 #include "llvm/IR/Function.h"
17 #include "llvm/IR/InstVisitor.h"
18 #include "llvm/InitializePasses.h"
19 #include "llvm/Pass.h"
20 #include "llvm/Support/Debug.h"
21 #include "llvm/Support/ErrorHandling.h"
22 #include "llvm/Support/raw_ostream.h"
23 using namespace llvm;
24
25 #define DEBUG_TYPE "instcount"
26
27 STATISTIC(TotalInsts, "Number of instructions (of all types)");
28 STATISTIC(TotalBlocks, "Number of basic blocks");
29 STATISTIC(TotalFuncs, "Number of non-external functions");
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 namespace {
37 class InstCount : public InstVisitor<InstCount> {
38 friend class InstVisitor<InstCount>;
39
visitFunction(Function & F)40 void visitFunction(Function &F) { ++TotalFuncs; }
visitBasicBlock(BasicBlock & BB)41 void visitBasicBlock(BasicBlock &BB) { ++TotalBlocks; }
42
43 #define HANDLE_INST(N, OPCODE, CLASS) \
44 void visit##OPCODE(CLASS &) { \
45 ++Num##OPCODE##Inst; \
46 ++TotalInsts; \
47 }
48
49 #include "llvm/IR/Instruction.def"
50
visitInstruction(Instruction & I)51 void visitInstruction(Instruction &I) {
52 errs() << "Instruction Count does not know about " << I;
53 llvm_unreachable(nullptr);
54 }
55 };
56 } // namespace
57
run(Function & F,FunctionAnalysisManager & FAM)58 PreservedAnalyses InstCountPass::run(Function &F,
59 FunctionAnalysisManager &FAM) {
60 LLVM_DEBUG(dbgs() << "INSTCOUNT: running on function " << F.getName()
61 << "\n");
62 InstCount().visit(F);
63
64 return PreservedAnalyses::all();
65 }
66
67 namespace {
68 class InstCountLegacyPass : public FunctionPass {
69 public:
70 static char ID; // Pass identification, replacement for typeid
InstCountLegacyPass()71 InstCountLegacyPass() : FunctionPass(ID) {
72 initializeInstCountLegacyPassPass(*PassRegistry::getPassRegistry());
73 }
74
runOnFunction(Function & F)75 bool runOnFunction(Function &F) override {
76 LLVM_DEBUG(dbgs() << "INSTCOUNT: running on function " << F.getName()
77 << "\n");
78 InstCount().visit(F);
79 return false;
80 };
81
getAnalysisUsage(AnalysisUsage & AU) const82 void getAnalysisUsage(AnalysisUsage &AU) const override {
83 AU.setPreservesAll();
84 }
85
print(raw_ostream & O,const Module * M) const86 void print(raw_ostream &O, const Module *M) const override {}
87 };
88 } // namespace
89
90 char InstCountLegacyPass::ID = 0;
91 INITIALIZE_PASS(InstCountLegacyPass, "instcount",
92 "Counts the various types of Instructions", false, true)
93
createInstCountPass()94 FunctionPass *llvm::createInstCountPass() { return new InstCountLegacyPass(); }
95