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//===--- LexicalLifetimeEliminator.cpp ------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2021 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
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "sil-lexical-lifetime-eliminator"
#include "swift/SILOptimizer/PassManager/Transforms.h"
using namespace swift;
namespace {
class LexicalLifetimeEliminatorPass : public SILFunctionTransform {
void run() override {
auto *fn = getFunction();
if (fn->forceEnableLexicalLifetimes())
return;
// If we are already canonical, we do not have any diagnostics to emit.
if (fn->wasDeserializedCanonical())
return;
// If we have experimental late lexical lifetimes enabled, we do not want to
// run this pass since we want lexical lifetimes to exist later in the
// pipeline.
if (fn->getModule().getOptions().LexicalLifetimes ==
LexicalLifetimesOption::On)
return;
bool madeChange = false;
for (auto &block : *fn) {
for (auto &inst : block) {
if (auto *bbi = dyn_cast<BeginBorrowInst>(&inst)) {
if (bbi->isLexical()) {
bbi->removeIsLexical();
madeChange = true;
}
continue;
}
if (auto *mvi = dyn_cast<MoveValueInst>(&inst)) {
if (mvi->isLexical()) {
mvi->removeIsLexical();
madeChange = true;
}
continue;
}
if (auto *asi = dyn_cast<AllocStackInst>(&inst)) {
if (asi->isLexical()) {
asi->removeIsLexical();
madeChange = true;
}
continue;
}
}
}
if (madeChange) {
invalidateAnalysis(SILAnalysis::InvalidationKind::Instructions);
}
}
};
} // anonymous namespace
SILTransform *swift::createLexicalLifetimeEliminator() {
return new LexicalLifetimeEliminatorPass();
}
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