src/js/post.js


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43


(function() {
  var wasmJS = WasmJS({}); // do not use the normal Module in the current scope

  // XXX don't be confused. Module here is in the outside program. wasmJS is the inner wasm-js.cpp.

  // Generate a module instance of the asm.js converted into wasm.
  var code;
  if (typeof read === 'function') {
    // spidermonkey or v8 shells
    code = read(Module['asmjsCodeFile']);
  } else if (typeof process === 'object' && typeof require === 'function') {
    // node.js
    code = require('fs')['readFileSync'](Module['asmjsCodeFile']).toString();
  } else {
    throw 'TODO: loading in other platforms';
  }

  var temp = wasmJS._malloc(code.length + 1);
  wasmJS.writeAsciiToMemory(code, temp);
  wasmJS._load_asm(temp);
  wasmJS._free(temp);

  // Generate memory XXX TODO get the right size
  var theBuffer = Module['buffer'] = new ArrayBuffer(16*1024*1024);

  // Information for the instance of the module.
  var info = wasmJS['info'] = {
    global: null,
    env: null,
    parent: Module // Module inside wasm-js.cpp refers to wasm-js.cpp; this allows access to the outside program.
  };

  // The asm.js function, called to "link" the asm.js module.
  Module['asm'] = function(global, env, buffer) {
    assert(buffer === theBuffer); // we should not even need to pass it as a 3rd arg for wasm, but that's the asm.js way.
    // write the provided data to a location the wasm instance can get at it.
    info.global = global;
    info.env = env;
    return wasmJS['asmExports'];
  };
})();