Re: regression on zOS between 5.4.8 to 5.5.0 on zOS

> The same SW stack and automated test works for me on AIX (which is
> also Big Endian), Windows, Linux/x86_64, Linux/s390x, and
> Linux/ppc64le
> The previous stack, with 5.4.8 or even 5.2.2. worked OK on the above + zOS
> 
> My suspicion is that something about the structs, unions, and
> shifting/masking around the representation of the stack is not as
> portable as 5.4.8.
> But I didn't get very far trying various de-optimizations in lobject.h
> and lopcodes.h

That is possible. Does zOS has something unusual related to alignment,
words, sizes for basic objects, or other memory issues?

In particular, can you try the following?

-------------------------------------------------------------------------
--- a/lstate.c
+++ b/lstate.c
@@ -345,2 +345,3 @@ LUA_API lua_State *lua_newstate (lua_Alloc f, void *ud, unsigned seed) {
                        (*f)(ud, NULL, LUA_TTHREAD, sizeof(global_State)));
+printf("%ld %ld\n", sizeof(StackValue), sizeof(TValue));
   if (g == NULL) return NULL;
-------------------------------------------------------------------------

StackValue is a union than contains a TValue, and there is a lot of
casts from one to the other. If we want to get the next element, we
must add 1 to a pointer to the first type, before the cast.

In most machines, these two objects have the same size, so a bug of
adding 1 after the cast won't be detected.

-- Roberto

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