mirror of
https://github.com/fluencelabs/assemblyscript
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42 lines
1.0 KiB
TypeScript
42 lines
1.0 KiB
TypeScript
import { HEAP_BASE, memory } from "../memory";
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import { AL_MASK, MAX_SIZE_32 } from "../util/allocator";
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// @ts-ignore: decorator
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@lazy
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var startOffset: usize = (HEAP_BASE + AL_MASK) & ~AL_MASK;
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// @ts-ignore: decorator
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@lazy
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var offset: usize = startOffset;
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// @ts-ignore: decorator
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@unsafe @global
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function __mem_allocate(size: usize): usize {
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if (size > MAX_SIZE_32) unreachable();
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var ptr = offset;
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var newPtr = (ptr + max<usize>(size, 1) + AL_MASK) & ~AL_MASK;
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var pagesBefore = memory.size();
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if (newPtr > <usize>pagesBefore << 16) {
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let pagesNeeded = ((newPtr - ptr + 0xffff) & ~0xffff) >>> 16;
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let pagesWanted = max(pagesBefore, pagesNeeded); // double memory
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if (memory.grow(pagesWanted) < 0) {
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if (memory.grow(pagesNeeded) < 0) {
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unreachable(); // out of memory
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}
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}
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}
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offset = newPtr;
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return ptr;
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}
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// @ts-ignore: decorator
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@unsafe @global
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function __mem_free(ptr: usize): void {
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}
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// @ts-ignore: decorator
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@unsafe @global
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function __mem_reset(): void {
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offset = startOffset;
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}
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