Preprocessing of interfaces to allow fast call through
A solution to avoid performance degradation associated with load-object independence by arranging interface source code, particurlarly JNI source code, in a stylized form, and then preprocessing the stylized interface source code into a Virtual Machine (“VM”) specific form. The stylized source code allows a preprocessor to identify and track field and method identifiers, and to match up the field and method uses with the specification of the field or method. The source code is stylized by substituting stylized variable names, each with a native element identifier, for non-stylized variables.
1. A method of executing an application having a native element and a legal syntax in a computing environment having a native interface and a virtual machine, the method comprising:
compiling the application to create a compiled version of the application;
creating a stylized version of the native element while maintaining the legal syntax, the stylized version of the native element including stylized names of variables and field and method identifiers for identifying the native element at a point in the application where the native element is used and a reference to the application;
passing the compiled version of the application and the stylized version of the native element to a preprocessor;
generating a targeted version of the native element in the preprocessor; and
compiling the targeted version of the native element.
2. A method as claimed in claim 1 , further comprising:
generating a library from the targeted version of the native element; and
passing the library and the compiled version of the application to an interpreter.
3. A method as claimed in claim 1 , wherein generating a targeted version of the native element includes using information that is specific to the virtual machine.
4. A method as claimed in claim 1 , wherein the computing environment includes interface source code further comprising:
preprocessing the stylized version of the interface source code;
examining each line of the interface source code for a predetermined pattern associated with a stylized variable name;
determining whether class information regarding the stylized variable name associated with the predetermined pattern is known; and
translating the line of code to a translated form if class information is known.
5. A method as claimed in claim 4 , wherein preprocessing the stylized version comprises removing comments from the interface source code before examining each line of the interface code.
6. A method as claimed in claim 4 , further comprising loading class information from a database of classes if class information regarding the stylized variable name associated with the predetermined pattern is not known.
7. A method as claimed in claim 5 , wherein preprocessing the stylized version of the interface source code comprises reinserting comments into the interface code after translating each line of code.