Profile guided just-in-time (JIT) compiler and byte code generation

A runtime engine in a computing device, comprising:

• a parser that receives source code coded in a dynamic language and parses the source code to generate parsed source code;
• a bytecode generator, at least partially implemented using one or more processors, that converts the parsed source code to bytecode;
• an execution controller;
• an interpreter that interprets the bytecode when enabled by the execution controller;
• a just-in-time (JIT) compiler configured to compile the bytecode when enabled by the execution controller, the compiled bytecode being executed when the JIT compiler is enabled by the execution controller;
• and
• a profile generator that generates profile information from the interpreted bytecode and stores the profile information, the profile generator generates and stores profile information that indicates at least one of a loop body in the bytecode, at least one pattern in the bytecode, a portion of the bytecode that is not used, a function called in the bytecode, or a number of times the function is called during execution;
• wherein the execution controller enables the interpreter or the JIT compiler based on the profile information.

A method in a computing device, comprising:

• receiving source code coded in a dynamic language for execution;
• generating, by one or more processors, bytecode from the received source code;
• receiving a portion of the bytecode at the interpreter;
• determining that compiled bytecode corresponding to the received bytecode portion is stored;
• and
• executing the compiled bytecode instead of interpreting the received bytecode portion.