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lf-lang / reactor-c

A reactor runtime written in C
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Suppress error: cast from pointer to integer of different size #448

Closed petervdonovan closed 1 week ago

petervdonovan commented 2 weeks ago

Closes #447.

Summary: I reviewed the pqueue_tag code that Edward and Byeong-gil worked on, and I determined that it was safe because I think that in practice, there are essentially no important platforms on which it will not work properly to cast a void pointer to an unsigned long long and back. This is because an unsigned long long is always at least 64 bits, and pointers in the real world are never larger than 64 bits.

Therefore, I decided to suppress the error using an intermediate cast to uintptr_t.

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Commits Files that changed from the base of the PR and between 6c51f7d53cf615deba957d8906894711ca0173a7 and 76408229db1e096d586f96eb7ea5259de6405220.

Walkthrough

The changes in pqueue_tag.c involve modifying how elements and priorities are cast to uintptr_t before converting them to pqueue_pri_t or accessing their tag field. These adjustments aim to fix build errors on 32-bit systems.

Changes

File Path Change Summary
core/utils/pqueue_tag.c Updated pqueue_tag_get_priority to cast element to uintptr_t first before pqueue_pri_t conversion. Adjusted pqueue_tag_compare to cast priorities to uintptr_t before accessing the tag field.

Assessment against linked issues

Objective (Issue #) Addressed Explanation
Fix build errors on 32-bit systems (#447) ✅

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petervdonovan commented 1 week ago

Closing in favor of #450

edwardalee commented 1 week ago

I am reopening this because a Zephyr test failure #450 on a 32-bit platform indicates that this solution may be better.