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e9c559b718
[NFC] Add -enable-sil-opaque-values frontend option. This will be used to change the SIL-level calling convention for opaque values, such as generics and resilient structs, to pass-by-value. Under this flag, opaque values have SSA lifetimes, managed by copy_value and destroy_value. This will make it easier to optimize copies and verify ownership. * [SILGen] type lowering support for opaque values. Add OpaqueValueTypeLowering. Under EnableSILOpaqueValues, lower address-only types as opaque values. * [SIL] Fix ValueOwnershipKind to support opaque SIL values. * Test case: SILGen opaque value support for Parameter/ResultConvention. * [SILGen] opaque value support for function arguments. * Future Test case: SILGen opaque value specialDest arguments. * Future Test case: SILGen opaque values: emitOpenExistential. * Test case: SIL parsing support for EnableSILOpaqueValues. * SILGen opaque values: prepareArchetypeCallee. * [SIL Verify] allow copy_value for EnableSILOpaqueValues. * Test cast: SIL serializer support for opaque values. * Add a static_assert for ParameterConvention layout. * Test case: Mandatory SILOpt support for EnableSILOpaqueValues. * Test case: SILOpt support for EnableSILOpaqueValues. * SILGen opaque values: TypeLowering emitCopyValue. * SILBuilder createLoad. Allow loading opaque values. * SIL Verifier. Allow loading and storing opaque values. * SILGen emitSemanticStore support for opaque values. * Test case for SILGen emitSemanticStore. * Test case for SIL mandatory support for inout assignment. * Fix SILGen opaque values test case after rebasing.
107 lines
3.7 KiB
C++
107 lines
3.7 KiB
C++
//===--- ManagedValue.cpp - Value with cleanup ----------------------------===//
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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 - 2017 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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//
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// A storage structure for holding a destructured rvalue with an optional
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// cleanup(s).
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// Ownership of the rvalue can be "forwarded" to disable the associated
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// cleanup(s).
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//
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//===----------------------------------------------------------------------===//
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#include "ManagedValue.h"
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#include "SILGenFunction.h"
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using namespace swift;
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using namespace Lowering;
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/// Emit a copy of this value with independent ownership.
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ManagedValue ManagedValue::copy(SILGenFunction &gen, SILLocation l) {
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if (!cleanup.isValid()) {
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assert(gen.getTypeLowering(getType()).isTrivial());
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return *this;
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}
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auto &lowering = gen.getTypeLowering(getType());
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assert(!lowering.isTrivial() && "trivial value has cleanup?");
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if (!lowering.isAddressOnly()) {
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return gen.emitManagedRetain(l, getValue(), lowering);
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}
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SILValue buf = gen.emitTemporaryAllocation(l, getType());
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gen.B.createCopyAddr(l, getValue(), buf, IsNotTake, IsInitialization);
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return gen.emitManagedRValueWithCleanup(buf, lowering);
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}
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/// Store a copy of this value with independent ownership into the given
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/// uninitialized address.
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void ManagedValue::copyInto(SILGenFunction &gen, SILValue dest,
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SILLocation loc) {
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auto &lowering = gen.getTypeLowering(getType());
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if (lowering.isAddressOnly()) {
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gen.B.createCopyAddr(loc, getValue(), dest, IsNotTake, IsInitialization);
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return;
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}
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SILValue copy = lowering.emitCopyValue(gen.B, loc, getValue());
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lowering.emitStoreOfCopy(gen.B, loc, copy, dest, IsInitialization);
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}
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/// This is the same operation as 'copy', but works on +0 values that don't
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/// have cleanups. It returns a +1 value with one.
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ManagedValue ManagedValue::copyUnmanaged(SILGenFunction &gen, SILLocation loc) {
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auto &lowering = gen.getTypeLowering(getType());
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if (lowering.isTrivial())
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return *this;
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SILValue result;
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if (!lowering.isAddress()) {
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result = lowering.emitCopyValue(gen.B, loc, getValue());
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} else {
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result = gen.emitTemporaryAllocation(loc, getType());
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gen.B.createCopyAddr(loc, getValue(), result, IsNotTake,IsInitialization);
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}
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return gen.emitManagedRValueWithCleanup(result, lowering);
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}
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/// Disable the cleanup for this value.
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void ManagedValue::forwardCleanup(SILGenFunction &gen) const {
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assert(hasCleanup() && "value doesn't have cleanup!");
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gen.Cleanups.forwardCleanup(getCleanup());
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}
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/// Forward this value, deactivating the cleanup and returning the
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/// underlying value.
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SILValue ManagedValue::forward(SILGenFunction &gen) const {
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if (hasCleanup())
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forwardCleanup(gen);
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return getValue();
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}
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void ManagedValue::forwardInto(SILGenFunction &gen, SILLocation loc,
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SILValue address) {
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if (hasCleanup())
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forwardCleanup(gen);
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auto &addrTL = gen.getTypeLowering(address->getType());
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gen.emitSemanticStore(loc, getValue(), address, addrTL, IsInitialization);
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}
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void ManagedValue::assignInto(SILGenFunction &gen, SILLocation loc,
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SILValue address) {
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if (hasCleanup())
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forwardCleanup(gen);
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auto &addrTL = gen.getTypeLowering(address->getType());
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gen.emitSemanticStore(loc, getValue(), address, addrTL,
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IsNotInitialization);
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}
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