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https://github.com/nunuhara/xsystem4.git
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Nunuhara Cabbage
e5ef9f4d2d
Implement CALLMETHOD, SH_STRUCTREF and PUSHSTRUCTPAGE instructions. Constructors are a bit tricky since SH_LOCALCREATE has to implicitly call an arbitrary number of functions before it returns (just changing the instruction pointer only allows for calling a single function). To get around this, there is now a vm_call() function which is used to call a function synchronously, before returning from the current instruction. Methods are implemented as functions, except that they get a struct page as local variable -1. Destructors are still not implemented.
82 lines
2.1 KiB
C
82 lines
2.1 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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#include "system4.h"
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#include "ain.h"
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#include "vm.h"
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#include "vm_string.h"
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#include "page.h"
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int32_t alloc_page(int nr_vars)
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{
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union vm_value *page = xmalloc(sizeof(union vm_value) * nr_vars);
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int32_t slot = heap_alloc_slot(VM_PAGE);
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heap[slot].page = page;
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return slot;
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}
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void delete_page(union vm_value *page, struct ain_variable *vars, int nr_vars)
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{
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for (int i = 0; i < nr_vars; i++) {
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struct ain_struct *s;
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switch (vars[i].data_type) {
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case AIN_STRING:
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heap_unref(page[i].i);
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break;
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case AIN_STRUCT:
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if (page[i].i == -1)
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break;
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s = &ain->structures[vars[i].struct_type];
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delete_page(heap[page[i].i].page, s->members, s->nr_members);
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heap_unref(page[i].i);
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break;
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default:
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break;
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}
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}
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}
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/*
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* Recursively copy a page.
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*/
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union vm_value *copy_page(union vm_value *src, struct ain_variable *vars, int nr_vars)
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{
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union vm_value *dst = xmalloc(sizeof(union vm_value) * nr_vars);
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for (int i = 0; i < nr_vars; i++) {
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int slot;
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struct ain_struct *s;
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union vm_value *page;
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switch (vars[i].data_type) {
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case AIN_STRING:
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slot = heap_alloc_slot(VM_STRING);
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heap[slot].s = string_dup(heap[src[i].i].s);
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dst[i].i = slot;
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break;
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case AIN_STRUCT:
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s = &ain->structures[vars[i].struct_type];
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page = copy_page(heap[src[i].i].page, s->members, s->nr_members);
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slot = heap_alloc_slot(VM_PAGE);
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heap[slot].page = page;
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dst[i].i = slot;
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break;
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default:
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dst[i] = src[i];
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break;
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}
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}
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return dst;
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}
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