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//===- llvm/IR/OptBisect/Bisect.cpp - LLVM Bisect support -----------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
/// \file
/// This file implements support for a bisecting optimizations based on a
/// command line option.
//
//===----------------------------------------------------------------------===//
#include "llvm/IR/OptBisect.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Analysis/CallGraph.h"
#include "llvm/Analysis/CallGraphSCCPass.h"
#include "llvm/Analysis/LoopInfo.h"
#include "llvm/Analysis/RegionInfo.h"
#include "llvm/IR/BasicBlock.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/Module.h"
#include "llvm/Pass.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/raw_ostream.h"
#include <cassert>
#include <limits>
#include <string>
using namespace llvm;
static cl::opt<int> OptBisectLimit("opt-bisect-limit", cl::Hidden,
cl::init(std::numeric_limits<int>::max()),
cl::Optional,
cl::desc("Maximum optimization to perform"));
OptBisect::OptBisect() : OptPassGate() {
BisectEnabled = OptBisectLimit != std::numeric_limits<int>::max();
}
static void printPassMessage(const StringRef &Name, int PassNum,
StringRef TargetDesc, bool Running) {
StringRef Status = Running ? "" : "NOT ";
errs() << "BISECT: " << Status << "running pass "
<< "(" << PassNum << ") " << Name << " on " << TargetDesc << "\n";
}
static std::string getDescription(const Module &M) {
return "module (" + M.getName().str() + ")";
}
static std::string getDescription(const Function &F) {
return "function (" + F.getName().str() + ")";
}
static std::string getDescription(const BasicBlock &BB) {
return "basic block (" + BB.getName().str() + ") in function (" +
BB.getParent()->getName().str() + ")";
}
static std::string getDescription(const Loop &L) {
// FIXME: Move into LoopInfo so we can get a better description
// (and avoid a circular dependency between IR and Analysis).
return "loop";
}
static std::string getDescription(const Region &R) {
// FIXME: Move into RegionInfo so we can get a better description
// (and avoid a circular dependency between IR and Analysis).
return "region";
}
static std::string getDescription(const CallGraphSCC &SCC) {
// FIXME: Move into CallGraphSCCPass to avoid circular dependency between
// IR and Analysis.
std::string Desc = "SCC (";
bool First = true;
for (CallGraphNode *CGN : SCC) {
if (First)
First = false;
else
Desc += ", ";
Function *F = CGN->getFunction();
if (F)
Desc += F->getName();
else
Desc += "<<null function>>";
}
Desc += ")";
return Desc;
}
bool OptBisect::shouldRunPass(const Pass *P, const Module &U) {
return !BisectEnabled || checkPass(P->getPassName(), getDescription(U));
}
bool OptBisect::shouldRunPass(const Pass *P, const Function &U) {
return !BisectEnabled || checkPass(P->getPassName(), getDescription(U));
}
bool OptBisect::shouldRunPass(const Pass *P, const BasicBlock &U) {
return !BisectEnabled || checkPass(P->getPassName(), getDescription(U));
}
bool OptBisect::shouldRunPass(const Pass *P, const Region &U) {
return !BisectEnabled || checkPass(P->getPassName(), getDescription(U));
}
bool OptBisect::shouldRunPass(const Pass *P, const Loop &U) {
return !BisectEnabled || checkPass(P->getPassName(), getDescription(U));
}
bool OptBisect::shouldRunPass(const Pass *P, const CallGraphSCC &U) {
return !BisectEnabled || checkPass(P->getPassName(), getDescription(U));
}
bool OptBisect::checkPass(const StringRef PassName,
const StringRef TargetDesc) {
assert(BisectEnabled);
int CurBisectNum = ++LastBisectNum;
bool ShouldRun = (OptBisectLimit == -1 || CurBisectNum <= OptBisectLimit);
printPassMessage(PassName, CurBisectNum, TargetDesc, ShouldRun);
return ShouldRun;
}
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