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Fast Hash Tables and Dynamic Arrays in C

2025-01-22

This article demonstrates how to quickly implement C equivalents of C++'s `std::unordered_map` and `std::vector`. By crafting a custom allocator, counted strings, and an efficient hash function, the author presents flat and hierarchical hash table implementations, alongside a dynamic array. The article also covers string concatenation, environment variable manipulation, and enhanced hash table security, using Address Space Layout Randomization (ASLR) to improve collision resistance.

Rules to Avoid Common Extended Inline Assembly Mistakes

2024-12-21

This article isn't an inline assembly tutorial, but rather a summary of six rules to avoid common mistakes. The author emphasizes that inline assembly is treacherous and should be avoided whenever possible, as modern compilers offer intrinsics and built-ins for most use cases. If unavoidable, the rules are: use the `volatile` qualifier; use a `memory` clobber if accessing memory; never modify input constraints; never call functions from inline assembly; don't define absolute assembly labels; and use the assembler's local label feature to avoid label conflicts. The article concludes by encouraging readers to practice applying these rules by reviewing online tutorials and even LLM-generated code.