mirror of
https://github.com/carbon-language/carbon-lang.git
synced 2026-09-25 19:00:09 +01:00
Geoff Romer
d2afd45214
This minimizes use of the Heap, and moves us toward not using it at compile time.
69 lines
2.2 KiB
C++
69 lines
2.2 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 EXECUTABLE_SEMANTICS_INTERPRETER_ADDRESS_H_
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#define EXECUTABLE_SEMANTICS_INTERPRETER_ADDRESS_H_
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#include <cstdint>
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#include <iostream>
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#include <string>
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#include <vector>
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#include "executable_semantics/interpreter/field_path.h"
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namespace Carbon {
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// An Address represents a memory address in the Carbon virtual machine.
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// Addresses are used to access values stored in a Heap, and are obtained
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// from a Heap (or by deriving them from other Addresses).
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class Address {
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public:
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Address(const Address&) = default;
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Address(Address&&) = default;
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auto operator=(const Address&) -> Address& = default;
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auto operator=(Address&&) -> Address& = default;
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// Returns true if the two addresses refer to the same memory location.
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friend auto operator==(const Address& lhs, const Address& rhs) -> bool {
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return lhs.index == rhs.index;
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}
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friend auto operator!=(const Address& lhs, const Address& rhs) -> bool {
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return !(lhs == rhs);
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}
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// Prints a human-readable representation of `a` to `out`.
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//
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// Currently, that representation consists of an integer index identifying
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// the whole memory allocation, and an optional FieldPath specifying a
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// particular field within that allocation.
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friend auto operator<<(std::ostream& out, const Address& a) -> std::ostream& {
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out << "Address(" << a.index << ")" << a.field_path;
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return out;
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}
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// If *this represents the address of an object with a field named
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// `field_name`, this method returns the address of that field.
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auto SubobjectAddress(std::string field_name) const -> Address {
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Address result = *this;
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result.field_path.Append(std::move(field_name));
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return result;
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}
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private:
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// The representation of Address describes how to locate an object within
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// the Heap, so its implementation details are tied to the implementation
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// details of the Heap.
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friend class Heap;
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explicit Address(uint64_t index) : index(index) {}
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uint64_t index;
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FieldPath field_path;
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};
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} // namespace Carbon
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#endif // EXECUTABLE_SEMANTICS_INTERPRETER_ADDRESS_H_
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