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LUAI_MAXSTACK defined privately

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LUAI_MAXSTACK is limited to INT_MAX/2, so can use INT_MAX/2 to define
pseudo-indices (LUA_REGISTRYINDEX) in 'lua.h'. A change in the maximum
stack size does not need to change the Lua-C ABI.
This commit is contained in:
Roberto Ierusalimschy
2025-07-01 10:57:02 -03:00
parent cfce6f4b20
commit 59a1adf194
4 changed files with 17 additions and 18 deletions
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6
lua.h
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@@ -37,10 +37,10 @@
/*
** Pseudo-indices
** (-LUAI_MAXSTACK is the minimum valid index; we keep some free empty
** space after that to help overflow detection)
** (The stack size is limited to INT_MAX/2; we keep some free empty
** space after that to help overflow detection.)
*/
#define LUA_REGISTRYINDEX (-LUAI_MAXSTACK - 1000)
#define LUA_REGISTRYINDEX (-(INT_MAX/2 + 1000))
#define lua_upvalueindex(i) (LUA_REGISTRYINDEX - (i))