Memory Management Mechanism for Preventing Dangling Pointers
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Solution Overview
Problem
Existing programming languages like C++ face challenges in ensuring type-safety during memory management, leading to potential type violations when memory is reused, which can be difficult to diagnose and debug.
Innovation Solution
A memory management mechanism that explicitly deallocates memory regions and scans for pointers to nullify them before reusing the memory, preventing dangling pointer issues and ensuring type-safety through an incremental cleaning process that runs periodically with program execution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If memory is reused after deallocation without cleaning, then memory efficiency is improved, but type-safety deteriorates due to dangling pointers
Solution Approach 1:
The patent applies preliminary action by scanning for and nullifying pointers to deallocated memory before the memory is reused. This preparatory cleaning process ensures that when memory is reallocated, any lingering pointers have already been set to null, preventing dangling pointer issues while enabling immediate memory reuse.
Solution Approach 2:
The patent extracts the harmful dangling pointers from the memory system by identifying and nullifying them during the cleaning process. This separation removes the problematic pointers from the deallocated memory regions before reuse, preserving memory efficiency while eliminating the type-safety risk.
2Reliability
If conventional garbage collection is used to ensure type-safety, then type-safety is improved, but system overhead increases
Solution Approach 1:
The patent implements self-service by having the program itself perform the cleaning operation through explicit calls to the memory management mechanism. Rather than relying on a separate garbage collection system, the program manually scans and nullifies pointers to deallocated memory, reducing system overhead while maintaining type-safety.
Solution Approach 2:
The patent discards the complex garbage collection approach and recovers memory through a simpler explicit deallocation and cleaning process. The memory management mechanism provides a lightweight interface that allows programs to manually manage memory cleanup, reducing the burden on the system while ensuring type-safety.
3Productivity
If memory is not cleaned before reuse, then productivity is maintained, but harmful factors increase due to undetected programming errors
Solution Approach 1:
The patent introduces feedback by providing a mechanism that detects and reports dangling pointers before they cause errors. The cleaning process scans for and identifies pointers to deallocated memory, allowing programmers to detect and fix issues before they manifest as runtime errors, thus maintaining productivity while reducing harmful factors.
Solution Approach 2:
The patent applies beforehand cushioning by nullifying pointers in advance before they can cause programming errors. This preventive measure creates a buffer against potential errors by ensuring that any attempt to access deallocated memory through lingering pointers will result in null pointer exceptions rather than undefined behavior.
Data Source
AI summary
A memory management mechanism requires data structures to be explicitly deallocated in the programming code, but deallocation does not immediately make the memory available for reuse. Before a deallocated memory region can be reused, memory is scanned for pointers to the deallocated region, and any such pointer is set to null. The deallocated memory is then available for reuse. Preferably, deallocated memory regions are accumulated, and an asynchronous memory cleaning process periodically scans memory to nullify the pointers. In order to prevent previously scanned memory becoming contaminated with a dangling pointer before the scan is finished, any write to a pointer is checked to verify that the applicable target address has not been deallocated.