mirror of
https://github.com/fluencelabs/assemblyscript
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39b489bee2
* Rename memory instructions as proposed by the bulk-memory-operations spec. * Rename memory manager functions to memory.* as well * Remove automatic inlining of constant globals (Binaryen does this now) * Improve 'const' enum compatibility * Improve module-level export generation * Enable the inline decorator for constant variables * Add ERROR, WARNING and INFO macros that emit a user-defined diagnostic * Reintroduce builtin decorator so these can appear anywhere in stdlib again * Inline isNaN and isFinite by default * Make an interface around gc.* similar to memory.* * Emit an error when trying to inline a mutable variable * Slim down CI stages * Add a more convenient tracing utility for debugging * Implement some prequesites for an eventual bundled GC
43 lines
1.2 KiB
TypeScript
43 lines
1.2 KiB
TypeScript
/**
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* Arena Memory Allocator
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*
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* Provides a `memory.reset` function to reset the heap to its initial state. A user has to make
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* sure that there are no more references to cleared memory afterwards. Always aligns to 8 bytes.
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*
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* @module std/assembly/allocator/arena
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*//***/
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import { AL_MASK, MAX_SIZE_32 } from "../internal/allocator";
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var startOffset: usize = (HEAP_BASE + AL_MASK) & ~AL_MASK;
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var offset: usize = startOffset;
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// Memory allocator interface
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@global export function __memory_allocate(size: usize): usize {
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if (size) {
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if (size > MAX_SIZE_32) unreachable();
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let ptr = offset;
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let newPtr = (ptr + size + AL_MASK) & ~AL_MASK;
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let 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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return 0;
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}
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@global export function __memory_free(ptr: usize): void { /* nop */ }
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@global export function __memory_reset(): void {
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offset = startOffset;
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}
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