llvm/lib/Analysis/InstCount.cpp

   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 }