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Portable not-so-smart Heap

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dcodeIO
2017-12-11 03:31:35 +01:00
parent d0b189b437
commit b5ffaf36cd
4 changed files with 54 additions and 13 deletions
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37
std/portable/heap.js
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@ -1,9 +1,34 @@
var globalScope = typeof window !== "undefined" && window || typeof global !== "undefined" && global || self;
globalScope["Heap"] = {
allocate: function() { throw new Error("not implemented"); },
dispose: function() { throw new Error("not implemented"); },
used: 0,
free: 0,
size: 0
var HEAP = new Uint8Array(65536);
var HEAP_OFFSET = 0;
Object.defineProperties(globalScope["Heap"] = {
allocate: function allocate(size) {
if (!size) return 0;
if (HEAP_OFFSET + size > HEAP.length) {
var oldHeap = HEAP;
HEAP = new Uint8Array(Math.max(HEAP.length + size, HEAP.length * 2));
HEAP.set(oldHeap);
}
var ptr = HEAP_OFFSET;
if ((HEAP_OFFSET += size) & 7)
HEAP_OFFSET = (HEAP_OFFSET | 7) + 1;
return ptr;
},
dispose: function dispose() { },
copy: function copy(dest, src, n) {
HEAP.set(HEAP.subarray(src, src + n), dest);
return dest;
}
}, {
used: { get: function get_used() { return HEAP_OFFSET; } },
free: { get: function get_free() { return HEAP.length - HEAP_OFFSET; } },
size: { get: function get_size() { return HEAP.length; } }
});
globalScope["store"] = function store(ptr, val) {
binaryen.HEAPU8[ptr] = val;
};
globalScope["load"] = function load(ptr) {
return binaryen.HEAPU8[ptr];
};