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Add a comment on WASM_STACK_GUARD_SIZE (#3332)

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YAMAMOTO Takashi 2024-04-19 11:19:59 +09:00 committed by GitHub
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core/config.h
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@ -445,7 +445,29 @@
#endif #endif
/* Reserved bytes to the native thread stack boundary, throw native /* Reserved bytes to the native thread stack boundary, throw native
stack overflow exception if the guard boudary is reached */ * stack overflow exception if the guard boudary is reached
*
* WASM_STACK_GUARD_SIZE needs to be large enough for:
*
* - native functions
* w/o hw bound check, the overhead (aot_call_function etc) + the native
* function itself. as of writing this, the former is about 1000 bytes
* on macOS amd64.
* with hw bound check, theoretically, only needs to cover the logic to
* set up the jmp_buf stack.
*
* - aot runtime functions
* eg. aot_enlarge_memory.
*
* - w/o hw bound check, the intepreter loop
*
* - stack check wrapper functions generated by the aot compiler
* (--stack-bounds-checks=1)
*
* Note: on platforms with lazy function binding, don't forget to consider
* the symbol resolution overhead on the first call. For example,
* on Ubuntu amd64 20.04, it seems to consume about 1500 bytes.
*/
#ifndef WASM_STACK_GUARD_SIZE #ifndef WASM_STACK_GUARD_SIZE
#if WASM_ENABLE_UVWASI != 0 #if WASM_ENABLE_UVWASI != 0
/* UVWASI requires larger native stack */ /* UVWASI requires larger native stack */