mirror of
https://github.com/apple/swift.git
synced 2025-12-14 20:36:38 +01:00
e14c1d1f62
Compute, update and handle borrowed-from instruction in various utilities and passes. Also, used borrowed-from to simplify `gatherBorrowIntroducers` and `gatherEnclosingValues`. Replace those utilities by `Value.getBorrowIntroducers` and `Value.getEnclosingValues`, which return a lazily computed Sequence of borrowed/enclosing values.
65 lines
2.7 KiB
C++
65 lines
2.7 KiB
C++
//===--- 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(lookThroughBorrowedFromUser(baseValue)->getConsumingUses());
|
|
// If the baseValue has no consuming uses, there is nothing more to verify
|
|
if (baseValConsumingUses.empty())
|
|
return false;
|
|
|
|
SmallVector<Operand *, 4> phiUses(lookThroughBorrowedFromUser(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);
|
|
}
|