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/*global Module*/
/*global HEAP32*/
/*global readLatin1String, writeStringToMemory*/
/*global requireRegisteredType, throwBindingError*/
var _emval_handle_array = [{}]; // reserve zero
var _emval_free_list = [];
// Public JS API
/** @expose */
Module.count_emval_handles = function() {
var count = 0;
for (var i = 1; i < _emval_handle_array.length; ++i) {
if (_emval_handle_array[i] !== undefined) {
++count;
}
}
return count;
};
/** @expose */
Module.get_first_emval = function() {
for (var i = 1; i < _emval_handle_array.length; ++i) {
if (_emval_handle_array[i] !== undefined) {
return _emval_handle_array[i];
}
}
return null;
};
// Private C++ API
var _emval_symbols = {}; // address -> string
function __emval_register_symbol(address) {
_emval_symbols[address] = readLatin1String(address);
}
function getStringOrSymbol(address) {
var symbol = _emval_symbols[address];
if (symbol === undefined) {
return readLatin1String(address);
} else {
return symbol;
}
}
function requireHandle(handle) {
if (!handle) {
throwBindingError('Cannot use deleted val. handle = ' + handle);
}
}
function __emval_register(value) {
var handle = _emval_free_list.length ?
_emval_free_list.pop() :
_emval_handle_array.length;
_emval_handle_array[handle] = {refcount: 1, value: value};
return handle;
}
function __emval_incref(handle) {
if (handle) {
_emval_handle_array[handle].refcount += 1;
}
}
function __emval_decref(handle) {
if (handle && 0 === --_emval_handle_array[handle].refcount) {
delete _emval_handle_array[handle];
_emval_free_list.push(handle);
var actual_length = _emval_handle_array.length;
while (actual_length > 0 && _emval_handle_array[actual_length - 1] === undefined) {
--actual_length;
}
_emval_handle_array.length = actual_length;
}
}
function __emval_new_array() {
return __emval_register([]);
}
function __emval_new_object() {
return __emval_register({});
}
function __emval_undefined() {
return __emval_register(undefined);
}
function __emval_null() {
return __emval_register(null);
}
function __emval_new_cstring(v) {
return __emval_register(getStringOrSymbol(v));
}
function __emval_take_value(type, v) {
type = requireRegisteredType(type, '_emval_take_value');
v = type.fromWireType(v);
return __emval_register(v);
}
var __newers = {}; // arity -> function
function __emval_new(handle, argCount, argTypes) {
requireHandle(handle);
var args = parseParameters(
argCount,
argTypes,
Array.prototype.slice.call(arguments, 3));
// Alas, we are forced to use operator new until WebKit enables
// constructing typed arrays without new.
// In WebKit, Uint8Array(10) throws an error.
// In every other browser, it's identical to new Uint8Array(10).
var newer = __newers[argCount];
if (!newer) {
var parameters = new Array(argCount);
for (var i = 0; i < argCount; ++i) {
parameters[i] = 'a' + i;
}
/*jshint evil:true*/
newer = __newers[argCount] = new Function(
['c'].concat(parameters),
"return new c(" + parameters.join(',') + ");");
}
var constructor = _emval_handle_array[handle].value;
var obj = newer.apply(undefined, [constructor].concat(args));
/*
// implement what amounts to operator new
function dummy(){}
dummy.prototype = constructor.prototype;
var obj = new constructor;
var rv = constructor.apply(obj, args);
if (typeof rv === 'object') {
obj = rv;
}
*/
return __emval_register(obj);
}
// appease jshint (technically this code uses eval)
var global = (function(){return Function;})()('return this')();
function __emval_get_global(name) {
name = getStringOrSymbol(name);
return __emval_register(global[name]);
}
function __emval_get_module_property(name) {
name = getStringOrSymbol(name);
return __emval_register(Module[name]);
}
function __emval_get_property(handle, key) {
requireHandle(handle);
return __emval_register(_emval_handle_array[handle].value[_emval_handle_array[key].value]);
}
function __emval_set_property(handle, key, value) {
requireHandle(handle);
_emval_handle_array[handle].value[_emval_handle_array[key].value] = _emval_handle_array[value].value;
}
function __emval_as(handle, returnType) {
requireHandle(handle);
returnType = requireRegisteredType(returnType, 'emval::as');
var destructors = [];
// caller owns destructing
return returnType.toWireType(destructors, _emval_handle_array[handle].value);
}
function parseParameters(argCount, argTypes, argWireTypes) {
var a = new Array(argCount);
for (var i = 0; i < argCount; ++i) {
var argType = requireRegisteredType(
HEAP32[(argTypes >> 2) + i],
"parameter " + i);
a[i] = argType.fromWireType(argWireTypes[i]);
}
return a;
}
function __emval_call(handle, argCount, argTypes) {
requireHandle(handle);
var fn = _emval_handle_array[handle].value;
var args = parseParameters(
argCount,
argTypes,
Array.prototype.slice.call(arguments, 3));
var rv = fn.apply(undefined, args);
return __emval_register(rv);
}
function __emval_call_method(handle, name, argCount, argTypes) {
requireHandle(handle);
name = getStringOrSymbol(name);
var args = parseParameters(
argCount,
argTypes,
Array.prototype.slice.call(arguments, 4));
var obj = _emval_handle_array[handle].value;
var rv = obj[name].apply(obj, args);
return __emval_register(rv);
}
function __emval_call_void_method(handle, name, argCount, argTypes) {
requireHandle(handle);
name = getStringOrSymbol(name);
var args = parseParameters(
argCount,
argTypes,
Array.prototype.slice.call(arguments, 4));
var obj = _emval_handle_array[handle].value;
obj[name].apply(obj, args);
}
function __emval_has_function(handle, name) {
name = getStringOrSymbol(name);
return _emval_handle_array[handle].value[name] instanceof Function;
}
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