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fitting a StackValue structure into 32 bytes (for 64-bit machines)

This commit is contained in:
Roberto Ierusalimschy 2017-11-06 15:34:06 -02:00
parent 93fd67b793
commit 5a3f26f855
1 changed files with 9 additions and 8 deletions
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17
lobject.h
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@ -1,5 +1,5 @@
/* /*
** $Id: lobject.h,v 2.127 2017/11/03 12:12:30 roberto Exp roberto $ ** $Id: lobject.h,v 2.128 2017/11/03 17:22:54 roberto Exp roberto $
** Type definitions for Lua objects ** Type definitions for Lua objects
** See Copyright Notice in lua.h ** See Copyright Notice in lua.h
*/ */
@ -314,26 +314,27 @@ typedef union StackValue {
struct { struct {
TValuefields; TValuefields;
lu_byte callstatus_; lu_byte callstatus_;
short nresults; /* expected number of results from this function */ char nresults; /* expected number of results from this function */
union {
unsigned char funcidx; /* called-function index */
unsigned char nyield; /* number of values yielded */
} u2;
unsigned short previous; /* difference to previous 'func' */ unsigned short previous; /* difference to previous 'func' */
unsigned short framesize; /* stack space available for this function */ unsigned short framesize; /* stack space available for this function */
union {
unsigned short funcidx; /* called-function index */
unsigned short nyield; /* number of values yielded */
} u2;
union { union {
struct { /* only for Lua functions */ struct { /* only for Lua functions */
const Instruction *savedpc; const Instruction *savedpc;
} l; } l;
struct { /* only for C functions */ struct { /* only for C functions */
lua_KFunction k; /* continuation in case of yields */ lua_KFunction k; /* continuation in case of yields */
ptrdiff_t old_errfunc; int old_errfunc;
lua_KContext ctx; /* context info. in case of yields */ int ctx; /* context info. in case of yields */
} c; } c;
} u; } u;
} stkci; } stkci;
} StackValue; } StackValue;
#define callstatus(ar) ((ar)->stkci.callstatus_) #define callstatus(ar) ((ar)->stkci.callstatus_)
/* top of a function (first element after its frame) */ /* top of a function (first element after its frame) */