Closure Variable Access via Stack Pointer Table
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Solution Overview
Problem
Existing computer programming systems face inefficiencies in managing closure variables, particularly in maintaining access to local variables within closure functions across multiple invocations, which can lead to resource wastage and performance issues due to reliance on heap memory and garbage collection.
Innovation Solution
The system instruments the computer program to create a closure object with pointers to stack frame variables, allowing direct access to closure variables on the runtime stack, thereby avoiding heap memory allocation and optimizing resource usage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If closure variables are stored in heap memory, then closure variables can be accessed across multiple function invocations, but memory allocation overhead and garbage collection overhead increase
Solution Approach 1:
The patent extracts closure variables from heap memory and places them directly on the stack frame. When a closure function is invoked, the system creates a closure object that contains pointers to the closure variables stored in the stack frame, eliminating the need for heap allocation and garbage collection for these variables.
Solution Approach 2:
The patent changes the storage dimension of closure variables from heap memory (one-dimensional allocation) to stack frame (structured memory layout with explicit pointers). This dimensional change allows direct access through pointer arithmetic rather than requiring garbage collection cycles.
2Reliability
If closure variables are stored in heap memory, then variables can be preserved across function exits, but resource wastage occurs due to continuous memory allocation
Solution Approach 1:
The patent performs preliminary action by allocating space for closure variables in the stack frame before the closure function is invoked. The closure object is created in advance with pointers to these pre-allocated stack locations, ensuring variables are preserved without continuous heap allocation across function invocations.
3Adaptability or versatility
If closure variables are saved in allocated heap memory, then the inner function can reference saved variables, but access speed decreases due to memory indirection
Solution Approach 1:
The patent segments the memory structure by separating closure variables from regular heap-allocated objects. Closure variables are placed in a dedicated stack frame region with explicit pointer management, creating a distinct memory segment that enables faster direct access compared to general heap memory indirection.
Data Source
AI summary
A system and method for accessing closure variables from a lambda expression in certain program configurations, in which the closure variable is accessed while the closure function is active and the closure variable is within an active runtime frame stack corresponding to an instance of the closure function. In response to entering the closure function, a pointer to each closure variable is stored in a stack pointer table. Each reference to each closure variable from the lambda expression is handled by using the closure variable pointer to locate the closure variable on the runtime stack. Program code may be instrumented to insert invocations to helper functions at locations upon entering the closure function and at each reference to each closure variable from the lambda expression.