Evaluating a program instruction within a stack evaluator

摘要

Call frame 204 associated with the instruction is generated in call stack 202. The call frame includes expression 210 specified by the instruction. Child frame 204 associated with the expression is generated within the stack, after which the stack may be transitioned to a stack evaluation state. It may be determined that child frame processing has been blocked, preferably by determining that the stack has transitioned to a blocked state, and, if so, batch processing the expression by an application server with other expressions. Modification to the child frame is received that sets value 208 of the expression within the child frame and the call frame is processed based partly on the value. Preferably, processing of the child frame is unblocked before the call frame is processed. A second call frame associated with the instruction may be generated within the stack including a second expression specified by the instruction and a child frame associated with the second expression is generated within the stack.