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//===--- GuaranteedPhiVerifier.cpp ----------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2018 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-guaranteed-phi-verifier"
#include "GuaranteedPhiVerifierPrivate.h"
using namespace swift;
bool GuaranteedPhiVerifier::verifyDependentPhiLifetime(SILPhiArgument *phi,
SILValue baseValue) {
// If the (phi, baseValue) pair was visited before, return.
auto it = dependentPhiToBaseValueMap.find(phi);
if (it != dependentPhiToBaseValueMap.end() &&
it->second.find(baseValue) != it->second.end()) {
return false;
}
// Insert (phi, baseValue) into the map.
dependentPhiToBaseValueMap[phi].insert(baseValue);
// Now, verify whether phi's lifetime is within baseValue's lifetime
SmallVector<Operand *, 4> baseValConsumingUses(baseValue->getConsumingUses());
// If the baseValue has no consuming uses, there is nothing more to verify
if (baseValConsumingUses.empty())
return false;
SmallVector<Operand *, 4> phiUses(phi->getUses());
LinearLifetimeChecker checker(deadEndBlocks);
// newErrorBuilder is consumed at the end of the checkValue function.
// Copy initial state from errorBuilder everytime
LinearLifetimeChecker::ErrorBuilder newErrorBuilder = errorBuilder;
// Verify whether the guaranteed phi lies within the lifetime of the base
// value.
auto linearLifetimeResult = checker.checkValue(
baseValue, baseValConsumingUses, phiUses, newErrorBuilder);
return linearLifetimeResult.getFoundError();
}
void GuaranteedPhiVerifier::verifyReborrows(BeginBorrowInst *borrow) {
auto visitReborrowPhiBaseValuePair = [&](SILPhiArgument *phi,
SILValue baseValue) {
verifyDependentPhiLifetime(phi, baseValue);
};
visitExtendedReborrowPhiBaseValuePairs(borrow, visitReborrowPhiBaseValuePair);
}
void GuaranteedPhiVerifier::verifyGuaranteedForwardingPhis(
BorrowedValue borrow) {
auto visitGuaranteedPhiBaseValuePair = [&](SILPhiArgument *phi,
SILValue baseValue) {
verifyDependentPhiLifetime(phi, baseValue);
};
visitExtendedGuaranteedForwardingPhiBaseValuePairs(
borrow, visitGuaranteedPhiBaseValuePair);
}
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