LLVM  12.0.0git
InstCount.cpp
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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 
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"
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 
40  void visitFunction(Function &F) { ++TotalFuncs; }
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 
51  void visitInstruction(Instruction &I) {
52  errs() << "Instruction Count does not know about " << I;
53  llvm_unreachable(nullptr);
54  }
55 };
56 } // namespace
57 
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
71  InstCountLegacyPass() : FunctionPass(ID) {
73  }
74 
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 
82  void getAnalysisUsage(AnalysisUsage &AU) const override {
83  AU.setPreservesAll();
84  }
85 
86  void print(raw_ostream &O, const Module *M) const override {}
87 };
88 } // namespace
89 
91 INITIALIZE_PASS(InstCountLegacyPass, "instcount",
92  "Counts the various types of Instructions", false, true)
93 
94 FunctionPass *llvm::createInstCountPass() { return new InstCountLegacyPass(); }
FunctionPass * createInstCountPass()
static PassRegistry * getPassRegistry()
getPassRegistry - Access the global registry object, which is automatically initialized at applicatio...
Base class for instruction visitors.
Definition: InstVisitor.h:79
This class represents lattice values for constants.
Definition: AllocatorList.h:23
A Module instance is used to store all the information related to an LLVM module.
Definition: Module.h:67
PreservedAnalyses run(Function &F, FunctionAnalysisManager &)
Definition: InstCount.cpp:58
STATISTIC(NumFunctions, "Total number of functions")
F(f)
static bool runOnFunction(Function &F, bool PostInlining)
A set of analyses that are preserved following a run of a transformation pass.
Definition: PassManager.h:155
LLVM Basic Block Representation.
Definition: BasicBlock.h:58
void initializeInstCountLegacyPassPass(PassRegistry &)
Represent the analysis usage information of a pass.
FunctionPass class - This class is used to implement most global optimizations.
Definition: Pass.h:298
static void print(raw_ostream &Out, object::Archive::Kind Kind, T Val)
raw_fd_ostream & errs()
This returns a reference to a raw_ostream for standard error.
static PreservedAnalyses all()
Construct a special preserved set that preserves all passes.
Definition: PassManager.h:161
#define llvm_unreachable(msg)
Marks that the current location is not supposed to be reachable.
raw_ostream & dbgs()
dbgs() - This returns a reference to a raw_ostream for debugging messages.
Definition: Debug.cpp:132
INITIALIZE_PASS(InstCountLegacyPass, "instcount", "Counts the various types of Instructions", false, true) FunctionPass *llvm
Definition: InstCount.cpp:91
void setPreservesAll()
Set by analyses that do not transform their input at all.
#define I(x, y, z)
Definition: MD5.cpp:59
This class implements an extremely fast bulk output stream that can only output to a stream.
Definition: raw_ostream.h:50
A container for analyses that lazily runs them and caches their results.
#define LLVM_DEBUG(X)
Definition: Debug.h:122