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//===-- InstCount.cpp - Collects the count of all instructions ------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This pass collects the count of all instructions and reports them
//
//===----------------------------------------------------------------------===//
#include "llvm/Analysis/Passes.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/InstVisitor.h"
#include "llvm/Pass.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
using namespace llvm;
#define DEBUG_TYPE "instcount"
STATISTIC(TotalInsts , "Number of instructions (of all types)");
STATISTIC(TotalBlocks, "Number of basic blocks");
STATISTIC(TotalFuncs , "Number of non-external functions");
STATISTIC(TotalMemInst, "Number of memory instructions");
#define HANDLE_INST(N, OPCODE, CLASS) \
STATISTIC(Num ## OPCODE ## Inst, "Number of " #OPCODE " insts");
#include "llvm/IR/Instruction.def"
namespace {
class InstCount : public FunctionPass, public InstVisitor<InstCount> {
friend class InstVisitor<InstCount>;
void visitFunction (Function &F) { ++TotalFuncs; }
void visitBasicBlock(BasicBlock &BB) { ++TotalBlocks; }
#define HANDLE_INST(N, OPCODE, CLASS) \
void visit##OPCODE(CLASS &) { ++Num##OPCODE##Inst; ++TotalInsts; }
#include "llvm/IR/Instruction.def"
void visitInstruction(Instruction &I) {
errs() << "Instruction Count does not know about " << I;
llvm_unreachable(nullptr);
}
public:
static char ID; // Pass identification, replacement for typeid
InstCount() : FunctionPass(ID) {
initializeInstCountPass(*PassRegistry::getPassRegistry());
}
bool runOnFunction(Function &F) override;
void getAnalysisUsage(AnalysisUsage &AU) const override {
AU.setPreservesAll();
}
void print(raw_ostream &O, const Module *M) const override {}
};
}
char InstCount::ID = 0;
INITIALIZE_PASS(InstCount, "instcount",
"Counts the various types of Instructions", false, true)
FunctionPass *llvm::createInstCountPass() { return new InstCount(); }
// InstCount::run - This is the main Analysis entry point for a
// function.
//
bool InstCount::runOnFunction(Function &F) {
unsigned StartMemInsts =
NumGetElementPtrInst + NumLoadInst + NumStoreInst + NumCallInst +
NumInvokeInst + NumAllocaInst;
visit(F);
unsigned EndMemInsts =
NumGetElementPtrInst + NumLoadInst + NumStoreInst + NumCallInst +
NumInvokeInst + NumAllocaInst;
TotalMemInst += EndMemInsts-StartMemInsts;
return false;
}
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