mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-24 21:30:12 +01:00
Adrien Leravat
19c74ead49
Add partial support for initializing expressions for variable declaration. 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. ## Functional changes * Initializing expressions initialize directly the provided storage when used to initialize a variable. * Allows initializing expressions to avoid a copy when using `[var|let] name: type = call_expression(...)` by initializing `name` in-place. * Support `returned var: ...` and `return <expr>` * Support nested initializing expressions ## Main implementation changes * Updated PatternMatch logic to handle expression categories * Updated `VariableDefinition` interpreter statement to allocate and pass a location to initializing expressions * Update statement actions to allow passing an allocation, used by return expr or returned var * Modified the RuntimeScope API to be one step closer to the memory model we want to have * Remove `GetAllocationId` and older `Bind` which don't apply * New set of tests to highlight those different situations * Added a new intrinsic to print the allocation stack (and make sure we behave correctly, beyond visible side effects) ## Next work * Dedicated `Action` to retrieve expression category information in the interpreter (https://github.com/carbon-language/carbon-lang/pull/2927) * Avoid copies when initializing value expression from reference expression and prevent mutations for the duration of the "pinning" (https://github.com/carbon-language/carbon-lang/pull/2927) * Avoid unnecessary copies from value expression to value expression, after ensuring that even value expression temporaries are registered for destruction. * Avoid unnecessary copies when binding function arguments
41 lines
1.3 KiB
C++
41 lines
1.3 KiB
C++
// 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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#ifndef CARBON_EXPLORER_INTERPRETER_HEAP_ALLOCATION_INTERFACE_H_
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#define CARBON_EXPLORER_INTERPRETER_HEAP_ALLOCATION_INTERFACE_H_
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#include "explorer/ast/address.h"
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#include "explorer/common/arena.h"
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#include "explorer/common/nonnull.h"
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namespace Carbon {
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class Value;
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// The allocation interface for Heap, factored out as an interface in order to
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// resolve a layering issue. No other class should derive from this.
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class HeapAllocationInterface {
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public:
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HeapAllocationInterface(const HeapAllocationInterface&) = delete;
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auto operator=(const HeapAllocationInterface&)
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-> HeapAllocationInterface& = delete;
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// Put the given value on the heap and mark it as alive.
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virtual auto AllocateValue(Nonnull<const Value*> v) -> AllocationId = 0;
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// Marks this allocation, and all of its sub-objects, as dead.
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virtual void Deallocate(AllocationId allocation) = 0;
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// Returns the arena used to allocate the values in this heap.
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virtual auto arena() const -> Arena& = 0;
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protected:
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HeapAllocationInterface() = default;
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virtual ~HeapAllocationInterface() = default;
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};
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} // namespace Carbon
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#endif // CARBON_EXPLORER_INTERPRETER_HEAP_ALLOCATION_INTERFACE_H_
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