Correct and expand documentation of handle_alloc_error and set_alloc_error_hook.
#115007
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…oc_error_hook`. Add the following facts: * `handle_alloc_error` may panic instead of aborting. * What happens if a hook returns rather than diverging. * A hook may panic. (This was already demonstrated in an example, but not stated in prose.) * A hook must be sound to call — it cannot assume that it is only called by the runtime, since its function pointer can be retrieved by safe code.
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…iaskrgr Rollup of 6 pull requests Successful merges: - rust-lang#114924 (coverage: Tidy up `run-coverage` tests in several small ways) - rust-lang#114927 (CI: add more debug logging to Docker caching) - rust-lang#114957 (tests: Fix tests for LoongArch64) - rust-lang#115007 (Correct and expand documentation of `handle_alloc_error` and `set_alloc_error_hook`.) - rust-lang#115098 (rust-gdbgui: remove excessive quotes) - rust-lang#115111 (compile rust-anaylzer with `x check` if it's enabled) r? `@ghost` `@rustbot` modify labels: rollup
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The primary goal of this change is to remove the false claim that
handle_alloc_erroralways aborts; instead, code should be prepared forhandle_alloc_errorto possibly unwind, and be sound under that condition.I saw other opportunities for improvement, so I have added all the following information:
handle_alloc_errormay panic instead of aborting. (Fixes Clarify thathandle_alloc_errormay unwind #114898)I've checked these statements against the source code of
allocandstd, but there may be nuances I haven't caught, so a careful review is welcome.