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dcode
2019-03-14 04:33:58 +01:00
parent e38f627c8b
commit 6163a73ab5
30 changed files with 645 additions and 1287 deletions
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57
std/assembly/allocator/arena.ts
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@ -1,41 +1,30 @@
/**
* Arena Memory Allocator
*
* Provides a `memory.reset` function to reset the heap to its initial state. A user has to make
* sure that there are no more references to cleared memory afterwards. Always aligns to 8 bytes.
*
* @module std/assembly/allocator/arena
*//***/
import { HEAP_BASE, memory } from "../memory";
import { AL_MASK, MAX_SIZE_32 } from "../util/allocator";
var startOffset: usize = (HEAP_BASE + AL_MASK) & ~AL_MASK;
var offset: usize = startOffset;
@lazy var startOffset: usize = (HEAP_BASE + AL_MASK) & ~AL_MASK;
@lazy var offset: usize = startOffset;
// Memory allocator implementation
@global namespace memory {
export function allocate(size: usize): usize {
if (size > MAX_SIZE_32) unreachable();
var ptr = offset;
var newPtr = (ptr + max<usize>(size, 1) + AL_MASK) & ~AL_MASK;
var pagesBefore = memory.size();
if (newPtr > <usize>pagesBefore << 16) {
let pagesNeeded = ((newPtr - ptr + 0xffff) & ~0xffff) >>> 16;
let pagesWanted = max(pagesBefore, pagesNeeded); // double memory
if (memory.grow(pagesWanted) < 0) {
if (memory.grow(pagesNeeded) < 0) {
unreachable(); // out of memory
}
@unsafe @global function __memory_allocate(size: usize): usize {
if (size > MAX_SIZE_32) unreachable();
var ptr = offset;
var newPtr = (ptr + max<usize>(size, 1) + AL_MASK) & ~AL_MASK;
var pagesBefore = memory.size();
if (newPtr > <usize>pagesBefore << 16) {
let pagesNeeded = ((newPtr - ptr + 0xffff) & ~0xffff) >>> 16;
let pagesWanted = max(pagesBefore, pagesNeeded); // double memory
if (memory.grow(pagesWanted) < 0) {
if (memory.grow(pagesNeeded) < 0) {
unreachable(); // out of memory
}
}
offset = newPtr;
return ptr;
}
export function free(ptr: usize): void { /* nop */ }
export function reset(): void {
offset = startOffset;
}
offset = newPtr;
return ptr;
}
@unsafe @global function __memory_free(ptr: usize): void {
}
@unsafe @global function __memory_reset(): void {
offset = startOffset;
}