stdlib.h.ts
dce8e2e6fb90master

stdlib.h.ts
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			import { arena, freedSet, die } from './memory.h';

			export type ptr = number;
			export type union = 'ptr' \| 'int' \| 'float' \| 'char*' \| 'unknown';

			export function malloc(size: number): ptr {
			const p = arena.brk;
			arena.brk += size;
			for (let i = 0; i < size; i++) freedSet.delete(p + i);
			return p;
			}

			export function dealloc(p: ptr, i: ptr) {
			delete arena.mem[p + i];
			freedSet.add(p + i);
			}

			export function free(p: ptr, size: number): void {
			if (freedSet.has(p)) die(p, 'pointer being freed was not allocated');
			for (let i = 0; i < size; i++) dealloc(p, i);
			}

			export function memcpy(dst: ptr, src: ptr, n: number): void {
			for (let i = 0; i < n; i++) arena.mem[dst + i] = arena.mem[src + i];
			}

			export interface struct_def<T extends string = string> {
			fields: Record<T, { offset: number; type: union }>;
			size: number;
			}

			export function typedef<T extends string>(fields: { name: T; type: union }[]): struct_def<T> {
			const result = {} as Record<T, { offset: number; type: union }>;
			fields.forEach((f, i) => {
			result[f.name] = { offset: i, type: f.type };
			});
			return { fields: result, size: fields.length };
			}

			export function $<T extends string>(def: struct_def<T>, field: T): number {
			return def.fields[field].offset;
			}