mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-28 18:34:54 +01:00
Adrien Leravat
d02366f881
Prevent copies when initializing value expression from reference expression. This is based on https://github.com/carbon-language/carbon-lang/pull/2006, which introduces expression categories, and how it is possible to convert to/from those different categories. Continuation of https://github.com/carbon-language/carbon-lang/pull/2907 ## Functional changes * Initializing a value expression from a reference expression takes its value without a copy * Reading from the value expression causes an error if the value changed from the time it was initialized * In this situation, prevents a copy both for variable definitions, and call parameter bindings ## Main implementation changes * Add new `ExpressionCategoryAction`, which evaluates an expression and returns an `ExpressionValue` containing its category and address (if any), in addition to the resulting `Value*` * `ExpressionAction`s now invokes `ExpressionCategoryAction` and unwraps the returned `ExpressionValue` * `RuntimeScope::BindAndPin` method, and corresponding when attempting to read a `value_node`. ## Next work * Avoid unnecessary copies from value expression to value expression, after ensuring that even value expression temporaries are registered for destruction (https://github.com/Pixep/carbon-lang/pull/9)
60 lines
2.0 KiB
Modula-2
60 lines
2.0 KiB
Modula-2
// Part of the Carbon Language project, under the Apache License v2.0 with LLVM
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// Exceptions. See /LICENSE for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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// This .def file expands the CARBON_VALUE_KIND macro once for each kind of
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// Value. The macro should be defined as taking a single argument, which is the
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// name of the Value type.
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#ifndef CARBON_VALUE_KIND
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#error #define CARBON_VALUE_KIND(kind) before including this header
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#endif
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CARBON_VALUE_KIND(IntValue)
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CARBON_VALUE_KIND(FunctionValue)
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CARBON_VALUE_KIND(DestructorValue)
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CARBON_VALUE_KIND(BoundMethodValue)
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CARBON_VALUE_KIND(PointerValue)
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CARBON_VALUE_KIND(LocationValue)
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CARBON_VALUE_KIND(ReferenceExpressionValue)
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CARBON_VALUE_KIND(BoolValue)
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CARBON_VALUE_KIND(StructValue)
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CARBON_VALUE_KIND(NominalClassValue)
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CARBON_VALUE_KIND(AlternativeValue)
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CARBON_VALUE_KIND(TupleValue)
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CARBON_VALUE_KIND(UninitializedValue)
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CARBON_VALUE_KIND(ImplWitness)
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CARBON_VALUE_KIND(BindingWitness)
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CARBON_VALUE_KIND(ConstraintWitness)
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CARBON_VALUE_KIND(ConstraintImplWitness)
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CARBON_VALUE_KIND(IntType)
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CARBON_VALUE_KIND(BoolType)
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CARBON_VALUE_KIND(TypeType)
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CARBON_VALUE_KIND(FunctionType)
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CARBON_VALUE_KIND(PointerType)
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CARBON_VALUE_KIND(AutoType)
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CARBON_VALUE_KIND(StructType)
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CARBON_VALUE_KIND(NominalClassType)
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CARBON_VALUE_KIND(TupleType)
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CARBON_VALUE_KIND(MixinPseudoType)
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CARBON_VALUE_KIND(InterfaceType)
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CARBON_VALUE_KIND(NamedConstraintType)
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CARBON_VALUE_KIND(ConstraintType)
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CARBON_VALUE_KIND(ChoiceType)
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CARBON_VALUE_KIND(VariableType)
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CARBON_VALUE_KIND(AssociatedConstant)
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CARBON_VALUE_KIND(ParameterizedEntityName)
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CARBON_VALUE_KIND(MemberName)
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CARBON_VALUE_KIND(BindingPlaceholderValue)
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CARBON_VALUE_KIND(AddrValue)
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CARBON_VALUE_KIND(AlternativeConstructorValue)
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CARBON_VALUE_KIND(StringType)
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CARBON_VALUE_KIND(StringValue)
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CARBON_VALUE_KIND(TypeOfMixinPseudoType)
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CARBON_VALUE_KIND(TypeOfParameterizedEntityName)
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CARBON_VALUE_KIND(TypeOfMemberName)
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CARBON_VALUE_KIND(TypeOfNamespaceName)
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CARBON_VALUE_KIND(StaticArrayType)
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#undef CARBON_VALUE_KIND
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