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/InitializePasses.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
30 #define HANDLE_INST(N, OPCODE, CLASS) \
31 STATISTIC(Num ## OPCODE ## Inst, "Number of " #OPCODE " insts");
32
33 #include "llvm/IR/Instruction.def"
34
35 namespace {
36 class InstCount : public FunctionPass, public InstVisitor<InstCount> {
37 friend class InstVisitor<InstCount>;
38
visitFunction(Function & F)39 void visitFunction (Function &F) { ++TotalFuncs; }
visitBasicBlock(BasicBlock & BB)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/IR/Instruction.def"
46
visitInstruction(Instruction & I)47 void visitInstruction(Instruction &I) {
48 errs() << "Instruction Count does not know about " << I;
49 llvm_unreachable(nullptr);
50 }
51 public:
52 static char ID; // Pass identification, replacement for typeid
InstCount()53 InstCount() : FunctionPass(ID) {
54 initializeInstCountPass(*PassRegistry::getPassRegistry());
55 }
56
57 bool runOnFunction(Function &F) override;
58
getAnalysisUsage(AnalysisUsage & AU) const59 void getAnalysisUsage(AnalysisUsage &AU) const override {
60 AU.setPreservesAll();
61 }
print(raw_ostream & O,const Module * M) const62 void print(raw_ostream &O, const Module *M) const override {}
63
64 };
65 }
66
67 char InstCount::ID = 0;
68 INITIALIZE_PASS(InstCount, "instcount",
69 "Counts the various types of Instructions", false, true)
70
createInstCountPass()71 FunctionPass *llvm::createInstCountPass() { return new InstCount(); }
72
73 // InstCount::run - This is the main Analysis entry point for a
74 // function.
75 //
runOnFunction(Function & F)76 bool InstCount::runOnFunction(Function &F) {
77 visit(F);
78 return false;
79 }
80