mirror of
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99 lines
3.5 KiB
C
99 lines
3.5 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_PAGE_H
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#define SYSTEM4_PAGE_H
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#include <stdbool.h>
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#include <stdint.h>
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#include "system4/ain.h"
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#include "vm.h"
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struct ain_variable;
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enum ain_data_type;
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enum page_type {
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GLOBAL_PAGE,
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LOCAL_PAGE,
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STRUCT_PAGE,
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ARRAY_PAGE
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};
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#define NR_PAGE_TYPES (ARRAY_PAGE+1)
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/*
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* A page is an ordered collection of variables. Pages are used to implement
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* global and local variables, structures and arrays as follows,
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*
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* Global variables: all global variables are stored in a single global page.
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*
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* Local variables: each function invocation is backed by a page storing its
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* local variables.
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*
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* Structures: each struct object is backed by a page storing its members.
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*
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* Arrays: each array object is backed by a page storing its members.
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* Multi-dimensional arrays are implemented as a tree of pages (meaning the
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* whole array is NOT contiguous in memory).
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*/
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struct page {
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enum page_type type;
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union {
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int index;
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enum ain_data_type a_type;
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};
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int struct_type; // for array pages
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int rank; // for array pages
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int nr_vars;
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union vm_value values[];
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};
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// variables
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union vm_value variable_initval(enum ain_data_type type);
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void variable_fini(union vm_value v, enum ain_data_type type);
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enum ain_data_type variable_type(struct page *page, int varno, int *struct_type, int *array_rank);
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void variable_set(struct page *page, int varno, enum ain_data_type type, union vm_value val);
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// pages
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struct page *alloc_page(enum page_type type, int type_index, int nr_vars);
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void free_page(struct page *page);
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struct page *copy_page(struct page *page);
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void delete_page_vars(struct page *page);
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void delete_page(int slot);
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// structs
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int alloc_struct(int no);
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void init_struct(int no, int slot);
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void delete_struct(int no, int slot);
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void create_struct(int no, union vm_value *var);
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// arrays
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enum ain_data_type array_type(enum ain_data_type type);
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struct page *alloc_array(int rank, union vm_value *dimensions, enum ain_data_type data_type, int struct_type, bool init_structs);
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struct page *realloc_array(struct page *src, int rank, union vm_value *dimensions, enum ain_data_type data_type, int struct_type, bool init_structs);
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int array_numof(struct page *page, int rank);
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void array_copy(struct page *dst, int dst_i, struct page *src, int src_i, int n);
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int array_fill(struct page *dst, int dst_i, int n, union vm_value v);
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struct page *array_pushback(struct page *dst, union vm_value v, enum ain_data_type data_type, int struct_type);
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struct page *array_popback(struct page *dst);
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struct page *array_erase(struct page *page, int i, bool *success);
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struct page *array_insert(struct page *page, int i, union vm_value v, enum ain_data_type data_type, int struct_type);
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void array_sort(struct page *page, int compare_fno);
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int array_find(struct page *page, int start, int end, union vm_value v, int compare_fno);
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void array_reverse(struct page *page);
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#endif /* SYSTEM4_PAGE_H */
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