Compiler Exception Annotation for Code Optimization
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Solution Overview
Problem
Conventional compilers face challenges in optimizing code that may throw exceptions at runtime, as predicting program behavior becomes complex due to exception handling mechanisms that operate outside the program's control flow, making it difficult to move instructions without unintended consequences.
Innovation Solution
Annotating exception information within a computer program during the compilation process, specifically in an intermediate form, to identify potential exception-causing portions and include this information in the code, allowing for optimized compilation without external queries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional compilers perform optimization on code that may throw exceptions, then code execution speed is improved, but prediction of program behavior becomes difficult due to exception handling mechanisms operating outside the program's control flow
Solution Approach 1:
The compiler performs preliminary analysis of the program to identify exception-handling code and annotate it with metadata before optimization. This preliminary action allows the compiler to understand exception flow patterns in advance, enabling safer optimizations while maintaining predictability of program behavior through annotated exception information.
2Productivity
If the compiler moves instructions to optimize code, then productivity is improved, but unintended consequences occur when exception handling code is involved
Solution Approach 1:
The compiler uses annotated exception information as feedback to guide optimization decisions. By continuously referring to the exception annotations during the optimization process, the compiler can adjust instruction movements to preserve correct exception handling behavior while still achieving productivity improvements through legitimate optimizations.
Solution Approach 2:
The compiler performs preliminary annotation of exception-handling code before optimization begins. This preliminary identification of exception contexts allows the compiler to plan optimizations that respect exception boundaries, preventing unintended consequences while maintaining high productivity.
3Measurement precision
If the compiler queries external information during optimization, then measurement precision of program behavior is improved, but device complexity increases
Solution Approach 1:
The invention extracts exception-handling information directly from the program's control flow analysis during compilation. By taking out and annotating this information within the compilation process itself, the system achieves precise measurement of program behavior related to exceptions without requiring complex external queries or additional sophisticated external analysis tools.
Data Source
AI summary
Annotation of exception information in a computer program. This annotation is not present in the source code itself, but is annotated during the compilation process or perhaps for purpose of analyzing the code. To perform the annotation, environmental rules are accessed regarding the environment in which the program is to be executed. The program is then evaluated in the context of these environmental rules to detect portions that, in the context of the environmental rules, may cause exceptions to be thrown. Those portions may then be annotated with exception information that describes any exceptions that could be thrown at that detected portion.