Virtual Controller Bit Padding Elimination via Structure Segmentation
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Solution Overview
Problem
Bit padding issues during the creation of virtual controllers can lead to improper functioning, as the occurrence of bit padding depends on the build tool used, and this can cause abnormal operation of the virtual controller.
Innovation Solution
A method is provided to check for bit padding when compiling source code containing structures with variables. If bit padding is detected, the method splits the bit-padded variable to eliminate memory blanks, and the source code is then compiled and linked to create a functional virtual controller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If bit padding is used to fill remaining memory space, then memory alignment is optimized, but virtual controller functionality becomes unreliable
Solution Approach 1:
The patent segments the structure into multiple sub-structures, each containing a subset of the original variables. This segmentation eliminates bit padding within each sub-structure while distributing variables across multiple aligned units, thereby maintaining memory alignment benefits without compromising virtual controller reliability.
Solution Approach 2:
The patent transitions from a single-dimensional structure to a multi-dimensional arrangement by creating multiple sub-structures. This dimensional change allows variables to be organized in a hierarchical manner, eliminating bit padding at the sub-structure level while maintaining overall structure integrity and functionality.
2Productivity
If build tool specific alignment strategies are used, then compilation efficiency is improved, but portability across different environments deteriorates
Solution Approach 1:
The patent creates sub-structures with explicit alignment attributes that are universally applicable across different build tools and environments. This universal approach ensures that the source code compiles efficiently and functions correctly regardless of the specific build tool or target environment, achieving both productivity and adaptability.
Solution Approach 2:
The patent modifies the alignment parameters by applying explicit alignment attributes to sub-structures and their variables. This parameter change allows precise control over memory layout, ensuring consistent behavior across different compilation environments while maintaining compilation efficiency.
3Quantity of substance
If variables are packed tightly in memory, then memory usage is optimized, but bit padding problems occur causing operational abnormalities
Solution Approach 1:
The patent divides the original structure into multiple sub-structures, each containing a carefully selected subset of variables. This segmentation allows tight packing within each sub-structure while avoiding bit padding issues that would occur in the monolithic structure, thereby optimizing memory usage without compromising operational correctness.
Solution Approach 2:
The patent applies different alignment and packing strategies to different sub-structures based on their specific variable compositions. This local quality approach allows each sub-structure to be optimized independently, achieving efficient memory usage while preventing bit padding problems in critical variable groups.
Data Source
AI summary
A method, processor, and program storage medium for solving a bit padding problem when creating a virtual controller are provided. In particular, a technique of allowing a virtual controller to work properly in any environment is provided. The technique may include changing the size of a structure in a source code and splitting a variable in order to prevent abnormal operation of the virtual controller that may be caused by bit padding.