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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/Pass.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/raw_ostream.h"
#include <cassert>
using namespace llvm;
static OptBisect &getOptBisector() {
static OptBisect OptBisector;
return OptBisector;
}
static OptDisable &getOptDisabler() {
static OptDisable OptDisabler;
return OptDisabler;
}
static cl::opt<int> OptBisectLimit("opt-bisect-limit", cl::Hidden,
cl::init(OptBisect::Disabled), cl::Optional,
cl::cb<void, int>([](int Limit) {
getOptBisector().setLimit(Limit);
}),
cl::desc("Maximum optimization to perform"));
static cl::opt<bool> OptBisectVerbose(
"opt-bisect-verbose",
cl::desc("Show verbose output when opt-bisect-limit is set"), cl::Hidden,
cl::init(true), cl::Optional);
static cl::list<std::string> OptDisablePasses(
"opt-disable", cl::Hidden, cl::CommaSeparated, cl::Optional,
cl::cb<void, std::string>([](const std::string &Pass) {
getOptDisabler().setDisabled(Pass);
}),
cl::desc("Optimization pass(es) to disable (comma-separated list)"));
static cl::opt<bool>
OptDisableVerbose("opt-disable-enable-verbosity",
cl::desc("Show verbose output when opt-disable is set"),
cl::Hidden, cl::init(false), cl::Optional);
static void printPassMessage(StringRef Name, int PassNum, StringRef TargetDesc,
bool Running) {
StringRef Status = Running ? "" : "NOT ";
errs() << "BISECT: " << Status << "running pass (" << PassNum << ") " << Name
<< " on " << TargetDesc << '\n';
}
bool OptBisect::shouldRunPass(StringRef PassName,
StringRef IRDescription) const {
assert(isEnabled());
int CurBisectNum = ++LastBisectNum;
bool ShouldRun = (BisectLimit == -1 || CurBisectNum <= BisectLimit);
if (OptBisectVerbose)
printPassMessage(PassName, CurBisectNum, IRDescription, ShouldRun);
return ShouldRun;
}
static void printDisablePassMessage(const StringRef &Name, StringRef TargetDesc,
bool Running) {
StringRef Status = Running ? "" : "NOT ";
dbgs() << "OptDisable: " << Status << "running pass " << Name << " on "
<< TargetDesc << "\n";
}
void OptDisable::setDisabled(StringRef Pass) { DisabledPasses.insert(Pass); }
bool OptDisable::shouldRunPass(StringRef PassName,
StringRef IRDescription) const {
assert(isEnabled());
const bool ShouldRun = !DisabledPasses.contains(PassName);
if (OptDisableVerbose)
printDisablePassMessage(PassName, IRDescription, ShouldRun);
return ShouldRun;
}
OptPassGate &llvm::getGlobalPassGate() {
if (getOptDisabler().isEnabled())
return getOptDisabler();
return getOptBisector();
}
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