src/runtime_legacy.js

/**
 * @license
 * Copyright 2010 The Emscripten Authors
 * SPDX-License-Identifier: MIT
 */

var ALLOC_NORMAL = 0; // Tries to use _malloc()
var ALLOC_STACK = 1; // Lives for the duration of the current function call

/**
 * allocate(): This function is no longer used by emscripten but is kept around to avoid
 *             breaking external users.
 *             You should normally not use allocate(), and instead allocate
 *             memory using _malloc()/stackAlloc(), initialize it with
 *             setValue(), and so forth.
 * @param {(Uint8Array|Array<number>)} slab: An array of data.
 * @param {number=} allocator : How to allocate memory, see ALLOC_*
 */
function allocate(slab, allocator) {
  var ret;
#if ASSERTIONS
  assert(typeof allocator == 'number', 'allocate no longer takes a type argument')
  assert(typeof slab != 'number', 'allocate no longer takes a number as arg0')
#endif

  if (allocator == ALLOC_STACK) {
    ret = stackAlloc(slab.length);
  } else {
    ret = {{{ makeMalloc('allocate', 'slab.length') }}};
  }

  if (!slab.subarray && !slab.slice) {
    slab = new Uint8Array(slab);
  }
  HEAPU8.set(slab, ret);
  return ret;
}