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Progress and a tiny WASM binary parser

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dcodeIO
2018-04-03 23:56:48 +02:00
parent 06198a3723
commit 5823e35f37
58 changed files with 12075 additions and 3964 deletions
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29
std/assembly/allocator/arena.ts
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@ -7,28 +7,31 @@
* @module std/assembly/allocator/arena
*//***/
import { MASK as AL_MASK } from "./common/alignment";
import { AL_MASK } from "./common";
var startOffset: usize = (HEAP_BASE + AL_MASK) & ~AL_MASK;
var offset: usize = startOffset;
@global
export function allocate_memory(size: usize): usize {
if (!size) return 0;
var ptr = offset;
var newPtr = (ptr + size + AL_MASK) & ~AL_MASK;
var pagesBefore = current_memory();
if (newPtr > <usize>pagesBefore << 16) {
let pagesNeeded = ((newPtr - ptr + 0xffff) & ~0xffff) >>> 16;
let pagesWanted = max(pagesBefore, pagesNeeded); // double memory
if (grow_memory(pagesWanted) < 0) {
if (grow_memory(pagesNeeded) < 0) {
unreachable(); // out of memory
const MAX_SIZE: usize = 1 << 30;
if (size && size < MAX_SIZE) {
let ptr = offset;
let newPtr = (ptr + size + AL_MASK) & ~AL_MASK;
let pagesBefore = current_memory();
if (newPtr > <usize>pagesBefore << 16) {
let pagesNeeded = ((newPtr - ptr + 0xffff) & ~0xffff) >>> 16;
let pagesWanted = max(pagesBefore, pagesNeeded); // double memory
if (grow_memory(pagesWanted) < 0) {
if (grow_memory(pagesNeeded) < 0) {
unreachable(); // out of memory
}
}
}
offset = newPtr;
return ptr;
}
offset = newPtr;
return ptr;
return 0;
}
@global