Implement pointer difference arithmetic #266
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ChAoSUnItY
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Sep 4, 2025
This improves the support for pointer difference calculations and refactors the parser by extracting complex pointer arithmetic logic into well-named helper functions. Limitation: Integer pointer differences (e.g., 'int *q - int *p') are not fully supported due to type information loss in the compilation pipeline. When pointer variables are loaded for use in expressions, they become temporaries without sufficient type information to determine element size for proper scaling. Workaround: For integer pointer differences, cast to char* and divide manually: ((char *) q - (char *) p) / sizeof(int) Character pointer differences work correctly because element size is 1, requiring no scaling.
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This commit adds comprehensive pointer difference support (
ptr1 - ptr2) that was missing from the existing pointer arithmetic implementation:*(p + (q - r))