LLVM  11.0.0git
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 
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"
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 
39  void visitFunction (Function &F) { ++TotalFuncs; }
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 
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
53  InstCount() : FunctionPass(ID) {
55  }
56 
57  bool runOnFunction(Function &F) override;
58 
59  void getAnalysisUsage(AnalysisUsage &AU) const override {
60  AU.setPreservesAll();
61  }
62  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 
71 FunctionPass *llvm::createInstCountPass() { return new InstCount(); }
72 
73 // InstCount::run - This is the main Analysis entry point for a
74 // function.
75 //
77  visit(F);
78  return false;
79 }
FunctionPass * createInstCountPass()
raw_ostream & errs()
This returns a reference to a raw_ostream for standard error.
static PassRegistry * getPassRegistry()
getPassRegistry - Access the global registry object, which is automatically initialized at applicatio...
INITIALIZE_PASS(InstCount, "instcount", "Counts the various types of Instructions", false, true) FunctionPass *llvm
Definition: InstCount.cpp:68
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
STATISTIC(NumFunctions, "Total number of functions")
F(f)
void initializeInstCountPass(PassRegistry &)
static bool runOnFunction(Function &F, bool PostInlining)
LLVM Basic Block Representation.
Definition: BasicBlock.h:57
Represent the analysis usage information of a pass.
FunctionPass class - This class is used to implement most global optimizations.
Definition: Pass.h:281
static void print(raw_ostream &Out, object::Archive::Kind Kind, T Val)
#define llvm_unreachable(msg)
Marks that the current location is not supposed to be reachable.
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:46