progress on wasm.js communication

1 files changed, 30 insertions, 0 deletions

diff --git a/src/js/post.js b/src/js/post.js
new file mode 100644
index 000000000..571fca101
--- /dev/null
+++ b/src/js/post.js
@@ -0,0 +1,30 @@
+
+(function() {
+  // 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 = read(Module['asmjsCodeFile']);
+  var temp = WasmJS._malloc(code.length + 1);
+  WasmJS.writeAsciiToMemory(code, temp);
+  var instance = 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 instance = WasmJS['instance'] = {
+    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.
+    instance.global = global;
+    instance.env = env;
+  };
+})();
+