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[core] Lint against std::nothrow, use RAMAllocator instead (#19244)

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J. Nick Koston
2026-09-25 15:50:32 +01:00
committed by GitHub
parent 2d8e43ef78
commit d3fd124c59
3 changed files with 82 additions and 5 deletions
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AGENTS.md
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@@ -737,7 +737,9 @@ file does, and it is the authority when they disagree. The most useful starting
6. **Avoid `std::deque`:** It allocates in 512-byte blocks regardless of element size, guaranteeing at least 512 bytes of RAM usage immediately. This is a major source of crashes on memory-constrained devices.
7. **Detection:** Look for these patterns in compiler output:
7. **Never use `new (std::nothrow)`:** On ESP-IDF exceptions are disabled, so a failed nothrow allocation aborts instead of returning `nullptr`. Use `RAMAllocator` from `esphome/core/helpers.h`; CI rejects `std::nothrow`.
8. **Detection:** Look for these patterns in compiler output:
- Large code sections with STL symbols (vector, map, set)
- `alloc`, `realloc`, `dealloc` in symbol names
- `_M_realloc_insert`, `_M_default_append` (vector reallocation)