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Nunuhara Cabbage
ac5859adfe
Local pages need to be reference counted like any other page. It is possible to create references to local variables which escape the extent of their function call, so using a stack doesn't work. Caching is implemented for small page sizes to avoid invoking malloc/free on every function call.
57 lines
1.3 KiB
C
57 lines
1.3 KiB
C
/* Copyright (C) 2019 Nunuhara Cabbage <nunuhara@haniwa.technology>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://gnu.org/licenses/>.
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*/
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#ifndef SYSTEM4_VM_H
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#define SYSTEM4_VM_H
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#include <stdint.h>
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// Non-heap values. Stored in pages and on the stack.
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union vm_value {
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int32_t i;
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int64_t i64;
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float f;
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};
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enum vm_pointer_type {
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VM_PAGE,
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VM_STRING
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};
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struct string;
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struct page;
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// Heap-backed objects. Reference counted.
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struct vm_pointer {
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int ref;
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enum vm_pointer_type type;
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union {
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struct string *s;
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struct page *page;
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};
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};
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struct ain;
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struct vm_pointer *heap;
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struct ain *ain;
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int32_t heap_alloc_slot(enum vm_pointer_type type);
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void heap_ref(int slot);
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void heap_unref(int slot);
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#endif /* SYSTEM4_VM_H */
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