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https://github.com/nunuhara/xsystem4.git
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Nunuhara Cabbage
5ff042738e
This isn't very well tested yet, but it runs Rance 01 up to the first HLL error.
89 lines
2.3 KiB
C
89 lines
2.3 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_HEAP_H
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#define SYSTEM4_HEAP_H
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#include <stdbool.h>
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#include <stddef.h>
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#include <stdint.h>
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struct string;
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struct page;
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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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#define NR_VM_POINTER_TYPES (VM_STRING+1)
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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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#ifdef DEBUG_HEAP
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size_t alloc_addr;
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size_t ref_addr;
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size_t free_addr;
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#endif
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};
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extern struct vm_pointer *heap;
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extern size_t heap_size;
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void heap_init(void);
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void heap_delete(void);
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void heap_grow(size_t new_size);
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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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void exit_unref(int slot);
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bool heap_index_valid(int index);
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bool page_index_valid(int index);
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bool string_index_valid(int index);
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struct page *heap_get_page(int index);
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struct page *heap_get_delegate_page(int index);
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struct string *heap_get_string(int index);
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void heap_set_page(int slot, struct page *page);
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void heap_string_assign(int slot, struct string *string);
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void heap_struct_assign(int lval, int rval);
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int32_t heap_alloc_page(struct page *page);
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int32_t heap_alloc_string(struct string *s);
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/*
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* Guarantee `headroom` free slots are available on the heap.
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*
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* XXX: this is a hack to fix an issue with HLL calls where a pointer into the
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* heap can be made invalid by a heap reallocation triggered within the
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* body of the HLL function.
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*/
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void heap_guarantee(unsigned headroom);
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#ifdef VM_PRIVATE
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extern int32_t *heap_free_stack;
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extern size_t heap_free_ptr;
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#endif /* VM_PRIVATE */
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#endif /* SYSTEM4_HEAP_H */
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