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f0633d5638
Add `Value.constantAccessPath`. It is like `accessPath`, but ensures that the projectionPath only contains "constant" elements. This means: if the access contains an `index_addr` projection with a non-constant index, the `projectionPath` does _not_ contain the `index_addr`. Instead, the `base` is an `AccessBase.index` which refers to the `index_addr`.
567 lines
21 KiB
Swift
567 lines
21 KiB
Swift
//===--- AddressUtils.swift - Utilities for handling SIL addresses -------===//
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//
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// This source file is part of the Swift.org open source project
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//
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// Copyright (c) 2014 - 2023 Apple Inc. and the Swift project authors
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// Licensed under Apache License v2.0 with Runtime Library Exception
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//
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// See https://swift.org/LICENSE.txt for license information
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// See https://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
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//
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//===----------------------------------------------------------------------===//
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import SIL
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private let verbose = false
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private func log(_ message: @autoclosure () -> String) {
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if verbose {
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print("### \(message())")
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}
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}
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/// Classify address uses. This can be used by def-use walkers to
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/// ensure complete handling of all legal SIL patterns.
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///
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/// TODO: Integrate this with SIL verification to ensure completeness.
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///
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/// TODO: Convert AddressDefUseWalker to use AddressUseVisitor after
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/// checking that the additional instructions are handled correctly by
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/// escape analysis.
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///
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/// TODO: Verify that pointerEscape is only called for live ranges in which
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/// `findPointerEscape()` returns true.
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protocol AddressUseVisitor {
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var context: Context { get }
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/// An address projection produces a single address result and does not
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/// escape its address operand in any other way.
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mutating func projectedAddressUse(of operand: Operand, into value: Value)
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-> WalkResult
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/// An access scope: begin_access, begin_apply, load_borrow.
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mutating func scopedAddressUse(of operand: Operand) -> WalkResult
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/// end_access, end_apply, abort_apply, end_borrow.
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mutating func scopeEndingAddressUse(of operand: Operand) -> WalkResult
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/// An address leaf use propagates neither the address bits, nor the
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/// in-memory value beyond the instruction.
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///
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/// StoringInstructions are leaf uses.
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mutating func leafAddressUse(of operand: Operand) -> WalkResult
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/// An address used by an apply.
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mutating func appliedAddressUse(of operand: Operand, by apply: FullApplySite)
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-> WalkResult
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/// A loaded address use propagates the value at the address.
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mutating func loadedAddressUse(of operand: Operand, into value: Value)
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-> WalkResult
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/// A loaded address use propagates the value at the address to the
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/// destination address operand.
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mutating func loadedAddressUse(of operand: Operand, into address: Operand)
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-> WalkResult
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/// Yielding an address may modify the value at the yield, but not past the yield. The yielded value may escape, but
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/// only if its type is escapable.
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mutating func yieldedAddressUse(of operand: Operand) -> WalkResult
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/// A non-address owned `value` whose ownership depends on the in-memory
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/// value at `address`, such as `mark_dependence %value on %address`.
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mutating func dependentAddressUse(of operand: Operand, into value: Value)
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-> WalkResult
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/// A pointer escape may propagate the address beyond the current instruction.
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mutating func escapingAddressUse(of operand: Operand) -> WalkResult
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/// A unknown address use. This should never be called in valid SIL.
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mutating func unknownAddressUse(of operand: Operand) -> WalkResult
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}
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extension AddressUseVisitor {
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/// Classify an address-type operand, dispatching to one of the
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/// protocol methods above.
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mutating func classifyAddress(operand: Operand) -> WalkResult {
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switch operand.instruction {
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case is BeginAccessInst, is LoadBorrowInst, is StoreBorrowInst:
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return scopedAddressUse(of: operand)
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case is EndAccessInst, is EndApplyInst, is AbortApplyInst, is EndBorrowInst:
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return scopeEndingAddressUse(of: operand)
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case let markDep as MarkDependenceInst:
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if markDep.valueOperand == operand {
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return projectedAddressUse(of: operand, into: markDep)
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}
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assert(markDep.baseOperand == operand)
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// If another address depends on the current address,
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// handle it like a projection.
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if markDep.type.isAddress {
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return projectedAddressUse(of: operand, into: markDep)
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}
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switch markDep.dependenceKind {
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case .Unresolved:
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if LifetimeDependence(markDep, context) == nil {
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break
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}
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fallthrough
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case .NonEscaping:
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// Note: This is unreachable from InteriorUseVisitor because the base address of a `mark_dependence
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// [nonescaping]` must be a `begin_access`, and interior liveness does not check uses of the accessed address.
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return dependentAddressUse(of: operand, into: markDep)
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case .Escaping:
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break
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}
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// A potentially escaping value depends on this address.
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return escapingAddressUse(of: operand)
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case let pai as PartialApplyInst where !pai.mayEscape:
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return dependentAddressUse(of: operand, into: pai)
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case let pai as PartialApplyInst where pai.mayEscape:
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return escapingAddressUse(of: operand)
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case is ThrowInst, is AddressToPointerInst:
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return escapingAddressUse(of: operand)
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case is StructElementAddrInst, is TupleElementAddrInst,
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is IndexAddrInst, is TailAddrInst, is TuplePackElementAddrInst,
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is InitEnumDataAddrInst, is UncheckedTakeEnumDataAddrInst,
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is InitExistentialAddrInst, is OpenExistentialAddrInst,
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is ProjectBlockStorageInst, is UncheckedAddrCastInst,
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is MarkUninitializedInst, is DropDeinitInst,
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is CopyableToMoveOnlyWrapperAddrInst,
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is MoveOnlyWrapperToCopyableAddrInst,
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is MarkUnresolvedNonCopyableValueInst:
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let svi = operand.instruction as! SingleValueInstruction
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return projectedAddressUse(of: operand, into: svi)
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case let apply as FullApplySite:
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return appliedAddressUse(of: operand, by: apply)
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case is SwitchEnumAddrInst, is CheckedCastAddrBranchInst,
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is SelectEnumAddrInst, is InjectEnumAddrInst,
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is StoreInst, is StoreUnownedInst, is StoreWeakInst,
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is AssignInst, is AssignByWrapperInst, is AssignOrInitInst,
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is TupleAddrConstructorInst, is InitBlockStorageHeaderInst,
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is RetainValueAddrInst, is ReleaseValueAddrInst,
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is DestroyAddrInst, is DeallocStackInst,
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is DeinitExistentialAddrInst,
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is IsUniqueInst, is MarkFunctionEscapeInst,
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is PackElementSetInst:
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return leafAddressUse(of: operand)
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case is LoadInst, is LoadUnownedInst, is LoadWeakInst, is ValueMetatypeInst, is ExistentialMetatypeInst,
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is PackElementGetInst:
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let svi = operand.instruction as! SingleValueInstruction
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return loadedAddressUse(of: operand, into: svi)
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case is YieldInst:
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return yieldedAddressUse(of: operand)
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case let sdai as SourceDestAddrInstruction
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where sdai.sourceOperand == operand:
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return loadedAddressUse(of: operand, into: sdai.destinationOperand)
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case let sdai as SourceDestAddrInstruction
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where sdai.destinationOperand == operand:
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return leafAddressUse(of: operand)
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case let builtin as BuiltinInst:
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switch builtin.id {
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// Builtins that cannot load a nontrivial value.
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case .TSanInoutAccess, .ResumeThrowingContinuationReturning,
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.ResumeNonThrowingContinuationReturning, .GenericAdd,
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.GenericFAdd, .GenericAnd, .GenericAShr, .GenericLShr, .GenericOr,
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.GenericFDiv, .GenericMul, .GenericFMul, .GenericSDiv,
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.GenericExactSDiv, .GenericShl, .GenericSRem, .GenericSub,
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.GenericFSub, .GenericUDiv, .GenericExactUDiv, .GenericURem,
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.GenericFRem, .GenericXor, .TaskRunInline, .ZeroInitializer,
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.GetEnumTag, .InjectEnumTag:
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return leafAddressUse(of: operand)
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default:
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// TODO: SIL verification should check that this exhaustively
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// recognizes all builtin address uses.
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return .abortWalk
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}
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case is BranchInst, is CondBranchInst:
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fatalError("address phi is not allowed")
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default:
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if operand.instruction.isIncidentalUse {
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return leafAddressUse(of: operand)
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}
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// Unknown instruction.
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return unknownAddressUse(of: operand)
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}
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}
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}
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extension AccessBase {
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/// If this access base has a single initializer, return it, along
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/// with the initialized address. This does not guarantee that all
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/// uses of that address are dominated by the store or even that the
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/// store is a direct use of `address`.
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func findSingleInitializer(_ context: some Context) -> (initialAddress: Value, initializingStore: Instruction)? {
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let baseAddr: Value
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switch self {
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case let .stack(allocStack):
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baseAddr = allocStack
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case let .argument(arg):
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guard arg.convention.isIndirectOut else {
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return nil
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}
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baseAddr = arg
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default:
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return nil
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}
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return AddressInitializationWalker.findSingleInitializer(ofAddress: baseAddr, context: context)
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}
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}
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// Walk the address def-use paths to find a single initialization.
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//
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// Implements AddressUseVisitor to guarantee that we can't miss any
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// stores. This separates escapingAddressUse from leafAddressUse.
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//
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// Main entry point:
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// static func findSingleInitializer(ofAddress: Value, context: some Context)
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//
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// TODO: Make AddressDefUseWalker always conform to AddressUseVisitor once we're
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// ready to debug changes to escape analysis etc...
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//
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// Future:
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// AddressUseVisitor
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// (how to transitively follow uses, complete classification)
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// -> AddressPathDefUseWalker
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// (follow projections and track Path,
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// client handles all other uses, such as access scopes)
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// -> AddressProjectionDefUseWalker
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// (follow projections, track Path, ignore access scopes,
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// merge all other callbacks into only two:
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// instantaneousAddressUse vs. escapingAddressUse)
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//
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// FIXME: This currently assumes that isAddressInitialization catches
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// writes to the memory address. We need a complete abstraction that
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// distinguishes between `mayWriteToMemory` for dependence vs. actual
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// modification of memory.
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struct AddressInitializationWalker: AddressDefUseWalker, AddressUseVisitor {
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let context: any Context
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var walkDownCache = WalkerCache<SmallProjectionPath>()
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var isProjected = false
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var initializingStore: Instruction?
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static func findSingleInitializer(ofAddress baseAddr: Value, context: some Context)
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-> (initialAddress: Value, initializingStore: Instruction)? {
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var walker = AddressInitializationWalker(context: context)
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if walker.walkDownUses(ofAddress: baseAddr, path: SmallProjectionPath()) == .abortWalk {
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return nil
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}
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guard let initializingStore = walker.initializingStore else {
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return nil
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}
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return (initialAddress: baseAddr, initializingStore: initializingStore)
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}
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private mutating func setInitializer(instruction: Instruction) -> WalkResult {
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// An initializer must be unique and store the full value.
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if initializingStore != nil || isProjected {
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initializingStore = nil
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return .abortWalk
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}
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initializingStore = instruction
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return .continueWalk
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}
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}
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// Implement AddressDefUseWalker
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extension AddressInitializationWalker {
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mutating func leafUse(address: Operand, path: SmallProjectionPath)
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-> WalkResult {
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isProjected = !path.isEmpty
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return classifyAddress(operand: address)
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}
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}
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// Implement AddressUseVisitor
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extension AddressInitializationWalker {
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/// An address projection produces a single address result and does not
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/// escape its address operand in any other way.
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mutating func projectedAddressUse(of operand: Operand, into value: Value)
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-> WalkResult {
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// AddressDefUseWalker should catch most of these.
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return .abortWalk
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}
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mutating func scopedAddressUse(of operand: Operand) -> WalkResult {
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// AddressDefUseWalker currently skips most of these.
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return .abortWalk
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}
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mutating func scopeEndingAddressUse(of operand: Operand) -> WalkResult {
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// AddressDefUseWalker currently skips most of these.
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return .continueWalk
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}
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mutating func leafAddressUse(of operand: Operand) -> WalkResult {
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if operand.isAddressInitialization {
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return setInitializer(instruction: operand.instruction)
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}
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// FIXME: check mayWriteToMemory but ignore non-stores. Currently,
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// stores should all be checked my isAddressInitialization, but
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// this is not robust.
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return .continueWalk
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}
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mutating func appliedAddressUse(of operand: Operand, by apply: FullApplySite)
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-> WalkResult {
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if operand.isAddressInitialization {
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return setInitializer(instruction: operand.instruction)
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}
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guard let convention = apply.convention(of: operand) else {
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return .continueWalk
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}
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return convention.isIndirectIn ? .continueWalk : .abortWalk
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}
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mutating func loadedAddressUse(of operand: Operand, into value: Value)
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-> WalkResult {
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return .continueWalk
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}
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mutating func loadedAddressUse(of operand: Operand, into address: Operand)
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-> WalkResult {
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return .continueWalk
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}
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mutating func yieldedAddressUse(of operand: Operand) -> WalkResult {
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// An inout yield is a partial write.
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return .abortWalk
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}
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mutating func dependentAddressUse(of operand: Operand, into value: Value)
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-> WalkResult {
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return .continueWalk
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}
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mutating func escapingAddressUse(of operand: Operand) -> WalkResult {
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return .abortWalk
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}
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mutating func unknownAddressUse(of operand: Operand) -> WalkResult {
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return .abortWalk
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}
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}
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/// A live range representing the ownership of addressable memory.
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///
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/// This live range represents the minimal guaranteed lifetime of the object being addressed. Uses of derived addresses
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/// may be extended up to the ends of this scope without violating ownership.
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///
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/// .liveOut objects (@in_guaranteed, @out) and .global variables have no instruction range.
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///
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/// .local objects (alloc_stack, yield, @in, @inout) report the single live range of the full assignment that reaches
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/// this address.
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///
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/// .owned values (boxes and references) simply report OSSA liveness.
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///
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/// .borrow values report each borrow scope's range. The effective live range is their intersection. A valid use must
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/// lie within all ranges.
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///
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/// FIXME: .borrow values should be represented with a single multiply-defined instruction range. Otherwise we will run
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/// out of blockset bits as soon as we have multiple ranges (each range uses three sets). It is ok to take the
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/// union of the borrow ranges since all address uses that may be extended will be already be dominated by the current
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/// address. Alternatively, we can have a utility that folds two InstructionRanges together as an intersection, and
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/// repeatedly fold the range of each borrow introducer.
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///
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/// Example:
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///
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/// %x = alloc_box
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/// %b = begin_borrow %x -+ begin ownership range
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/// %p = project_box %b | <--- accessBase
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/// %a = begin_access %p |
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/// end_access %a | <--- address use
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/// end_borrow %b -+ end ownership range
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/// destroy_value %x
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///
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/// This may return multiple ranges if a borrowed reference has multiple introducers:
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///
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/// %b1 = begin_borrow -+ range1
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/// %b2 = begin_borrow | -+ -+ range2
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/// %s = struct (%b1, %2) | | |
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/// %e = struct_extract %s, #s.0 | | | intersection
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/// %d = ref_element_addr %e | | | where ownership
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/// %a = begin_access %d | | | is valid
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/// end_access %a | | |
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/// end_borrow %b1 -+ | -+
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/// ... |
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/// end_borrow %b2 -+
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///
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/// Note: The resulting live range must be deinitialized in stack order.
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enum AddressOwnershipLiveRange : CustomStringConvertible {
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case liveOut(FunctionArgument)
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case global(GlobalVariable)
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case local(Value, InstructionRange) // Value represents the local allocation
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case owned(Value, InstructionRange)
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case borrow(SingleInlineArray<(BeginBorrowValue, InstructionRange)>)
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mutating func deinitialize() {
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switch self {
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case .liveOut, .global:
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break
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case var .local(_, range):
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range.deinitialize()
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case var .owned(_, range):
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range.deinitialize()
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case var .borrow(ranges):
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for idx in ranges.indices {
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ranges[idx].1.deinitialize()
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}
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}
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}
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/// Return nil if the live range is unknown.
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static func compute(for address: Value, at begin: Instruction,
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_ localReachabilityCache: LocalVariableReachabilityCache,
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_ context: FunctionPassContext) -> AddressOwnershipLiveRange? {
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let accessBase = address.accessBase
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switch accessBase {
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case .box, .class, .tail:
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return computeValueLiveRange(of: accessBase.reference!, context)
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case let .stack(allocStack):
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return computeLocalLiveRange(allocation: allocStack, begin: begin, localReachabilityCache, context)
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case let .global(global):
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return .global(global)
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case let .argument(arg):
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switch arg.convention {
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case .indirectInGuaranteed, .indirectOut:
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return .liveOut(arg)
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case .indirectIn, .indirectInout, .indirectInoutAliasable:
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return computeLocalLiveRange(allocation: arg, begin: begin, localReachabilityCache, context)
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default:
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return nil
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}
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case let .yield(result):
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let apply = result.parentInstruction as! BeginApplyInst
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switch apply.convention(of: result) {
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case .indirectInGuaranteed:
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var range = InstructionRange(for: address, context)
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_ = BorrowingInstruction(apply)!.visitScopeEndingOperands(context) {
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range.insert($0.instruction)
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return .continueWalk
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}
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return .local(result, range)
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case .indirectIn, .indirectInout, .indirectInoutAliasable:
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return computeLocalLiveRange(allocation: result, begin: begin, localReachabilityCache, context)
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default:
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return nil
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}
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case .storeBorrow(let sb):
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return computeValueLiveRange(of: sb.source, context)
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case .pointer, .index, .unidentified:
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return nil
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}
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}
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/// Does this inclusive range include `inst`, assuming that `inst` occurs after a definition of the live range.
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func coversUse(_ inst: Instruction) -> Bool {
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switch self {
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case .liveOut, .global:
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return true
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case let .local(_, range), let .owned(_, range):
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return range.inclusiveRangeContains(inst)
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case let .borrow(borrowRanges):
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for (_, range) in borrowRanges {
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if !range.inclusiveRangeContains(inst) {
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return false
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}
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}
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return true
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}
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}
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var description: String {
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switch self {
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case let .liveOut(arg):
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return "liveOut: \(arg)"
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case let .global(global):
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return "global: \(global)"
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|
case let .local(allocation, range):
|
|
return "local: \(allocation)\n\(range)"
|
|
case let .owned(value, range):
|
|
return "owned: \(value)\n\(range)"
|
|
case let .borrow(borrowRanges):
|
|
var str = ""
|
|
for (borrow, range) in borrowRanges {
|
|
str += "borrow: \(borrow)\n\(range)"
|
|
}
|
|
return str
|
|
}
|
|
}
|
|
}
|
|
|
|
extension AddressOwnershipLiveRange {
|
|
/// Compute the ownership live range of any non-address value.
|
|
///
|
|
/// For an owned value, simply compute its liveness. For a guaranteed value, return a separate range for each borrow
|
|
/// introducer.
|
|
///
|
|
/// For address values, use AccessBase.computeOwnershipRange.
|
|
///
|
|
/// FIXME: This should use computeLinearLiveness rather than computeKnownLiveness as soon as lifetime completion
|
|
/// runs immediately after SILGen.
|
|
private static func computeValueLiveRange(of value: Value, _ context: FunctionPassContext)
|
|
-> AddressOwnershipLiveRange? {
|
|
switch value.ownership {
|
|
case .none, .unowned:
|
|
// This is unexpected for a value with derived addresses.
|
|
return nil
|
|
case .owned:
|
|
return .owned(value, computeKnownLiveness(for: value, context))
|
|
case .guaranteed:
|
|
return .borrow(computeBorrowLiveRange(for: value, context))
|
|
}
|
|
}
|
|
|
|
private static func computeLocalLiveRange(allocation: Value, begin: Instruction,
|
|
_ localReachabilityCache: LocalVariableReachabilityCache,
|
|
_ context: some Context) -> AddressOwnershipLiveRange? {
|
|
guard let localReachability = localReachabilityCache.reachability(for: allocation, context) else {
|
|
return nil
|
|
}
|
|
var reachingAssignments = Stack<LocalVariableAccess>(context)
|
|
defer { reachingAssignments.deinitialize() }
|
|
|
|
if !localReachability.gatherReachingAssignments(for: begin, in: &reachingAssignments) {
|
|
return nil
|
|
}
|
|
// Any one of the reaching assignment is sufficient to compute the minimal live range. The caller presumably only
|
|
// cares about the live range that is dominated by 'begin'. Since all assignments gathered above reach
|
|
// 'begin', their live ranges must all be identical on all paths through 'addressInst'.
|
|
let assignment = reachingAssignments.first!
|
|
|
|
var reachableUses = Stack<LocalVariableAccess>(context)
|
|
defer { reachableUses.deinitialize() }
|
|
|
|
localReachability.gatherKnownReachableUses(from: assignment, in: &reachableUses)
|
|
|
|
let assignmentInst = assignment.instruction ?? allocation.parentFunction.entryBlock.instructions.first!
|
|
var range = InstructionRange(begin: assignmentInst, context)
|
|
for localAccess in reachableUses {
|
|
if localAccess.kind == .escape {
|
|
log("Local variable: \(allocation)\n escapes at \(localAccess.instruction!)")
|
|
}
|
|
for end in localAccess.instruction!.endInstructions {
|
|
range.insert(end)
|
|
}
|
|
}
|
|
return .local(allocation, range)
|
|
}
|
|
}
|