Although I'm not a JavaScript developer, I'm currently delving into the process of converting Java code to JS using the GWT compiler in order to identify the root cause of memory growth in our extensive application.
Every now and then, I come across variables assigned to "_" like this:
_ = com_google_gwt_event_shared_GwtEvent.prototype = new java_lang_Object;
These types of assignments are scattered throughout the code. What exactly do they signify?
The GWT compiler utilizes JavaScript prototype chains to represent the Java type hierarchy. The `_` symbol serves as a global temporary variable for the compiler and short JSNI methods. Within the generated script's top scope, you will typically find:
// Define the JS constructor(s) for the type
function com___GwtEvent() {}
// Inherit methods from the supertype via prototype chain
_ = com___GwtEvent.prototype = new java_lang_Object;
// Attach polymorphically-dispatched methods to the new type
_.someInstanceMethod = function(a,b,c){.....}
// Static-dispatch methods
function $someOtherMethod(this$static, d, e) {...}
In cases where methods have a `this$static` parameter, the compiler determines that the Java expression `instance.someOtherMethod()` is not polymorphic (potentially through type-tightening) and optimizes away the runtime overhead of an intermediate symbol lookup.
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