llvm-project

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/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 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 &) {                                                \
43
    ++Num##OPCODE##Inst;                                                       \
44
    ++TotalInsts;                                                              \
45
  }
46

47
#include "llvm/IR/Instruction.def"
48

49
  void visitInstruction(Instruction &I) {
50
    errs() << "Instruction Count does not know about " << I;
51
    llvm_unreachable(nullptr);
52
  }
53
};
54
} // namespace
55

56
PreservedAnalyses InstCountPass::run(Function &F,
57
                                     FunctionAnalysisManager &FAM) {
58
  LLVM_DEBUG(dbgs() << "INSTCOUNT: running on function " << F.getName()
59
                    << "\n");
60
  InstCount().visit(F);
61

62
  return PreservedAnalyses::all();
63
}
64