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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.
55 lines
1.3 KiB
C
55 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_FRAME,
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VM_PAGE,
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VM_STRING
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};
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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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union vm_value *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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