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//===--- ARCLoopOpts.cpp --------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2017 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See https://swift.org/LICENSE.txt for license information
// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
///
/// \file
///
/// This is a pass that runs multiple interrelated loop passes on a function. It
/// also provides caching of certain analysis information that is used by all of
/// the passes.
///
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "arc-sequence-opts"
#include "swift/SILOptimizer/PassManager/Passes.h"
#include "ARCSequenceOpts.h"
#include "swift/SILOptimizer/Analysis/AliasAnalysis.h"
#include "swift/SILOptimizer/Analysis/DominanceAnalysis.h"
#include "swift/SILOptimizer/Analysis/LoopAnalysis.h"
#include "swift/SILOptimizer/Analysis/LoopRegionAnalysis.h"
#include "swift/SILOptimizer/Analysis/ProgramTerminationAnalysis.h"
#include "swift/SILOptimizer/Analysis/RCIdentityAnalysis.h"
#include "swift/SILOptimizer/PassManager/Transforms.h"
using namespace swift;
//===----------------------------------------------------------------------===//
// Top Level Driver
//===----------------------------------------------------------------------===//
namespace {
class ARCLoopOpts : public SILFunctionTransform {
void run() override {
auto *F = getFunction();
// If ARC optimizations are disabled, don't optimize anything and bail.
if (!getOptions().EnableARCOptimizations)
return;
// Skip global init functions.
if (F->isGlobalInitOnceFunction())
return;
auto *LA = getAnalysis<SILLoopAnalysis>();
auto *LI = LA->get(F);
auto *DA = getAnalysis<DominanceAnalysis>();
auto *DI = DA->get(F);
// Canonicalize the loops, invalidating if we need to.
if (canonicalizeAllLoops(DI, LI)) {
// We preserve loop info and the dominator tree.
DA->lockInvalidation();
LA->lockInvalidation();
PM->invalidateAnalysis(F, SILAnalysis::InvalidationKind::FunctionBody);
DA->unlockInvalidation();
LA->unlockInvalidation();
}
// Get all of the analyses that we need.
auto *AA = getAnalysis<AliasAnalysis>(F);
auto *RCFI = getAnalysis<RCIdentityAnalysis>()->get(F);
auto *EAFI = getAnalysis<EpilogueARCAnalysis>()->get(F);
auto *LRFI = getAnalysis<LoopRegionAnalysis>()->get(F);
ProgramTerminationFunctionInfo PTFI(F);
// Create all of our visitors, register them with the visitor group, and
// run.
LoopARCPairingContext LoopARCContext(*F, AA, LRFI, LI, RCFI, EAFI, &PTFI);
SILLoopVisitorGroup VisitorGroup(F, LI);
VisitorGroup.addVisitor(&LoopARCContext);
VisitorGroup.run();
if (LoopARCContext.madeChange()) {
invalidateAnalysis(SILAnalysis::InvalidationKind::CallsAndInstructions);
}
}
};
} // end anonymous namespace
SILTransform *swift::createARCLoopOpts() {
return new ARCLoopOpts();
}
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