gnh1201/wasm-micro-runtime
1
0
Fork 0
mirror of https://github.com/bytecodealliance/wasm-micro-runtime.git synced 2025-02-06 06:55:07 +00:00
Code Issues Actions 9 Packages Projects Releases Wiki Activity

Add a comment on WASM_STACK_GUARD_SIZE (#3332)

Browse Source
This commit is contained in:
YAMAMOTO Takashi 2024-04-19 11:19:59 +09:00 committed by GitHub
parent ba59e56e19
commit f6481cedec
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
1 changed files with 23 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
core/config.h
View File

@ -445,7 +445,29 @@
#endif
/* 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
#if WASM_ENABLE_UVWASI != 0
/* UVWASI requires larger native stack */