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changed to store the stack poitner of the active process before context switching. the stored stack pointer is used to restore stix->sp when a method return is performed

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This commit is contained in:
hyunghwan.chung 2016-02-16 17:00:10 +00:00
parent 8f91b7adc3
commit fc7a44ba7d
2 changed files with 23 additions and 7 deletions
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26
stix/lib/exec.c
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@ -432,7 +432,11 @@ static STIX_INLINE int activate_new_method (stix_t* stix, stix_oop_method_t mth)
*
* if no temporaries exist, the initial sp is -1.
*/
#if defined(STIX_USE_PROCSTK)
/* ctx->sp will be set further down */
#else
ctx->sp = STIX_SMOOI_TO_OOP(ntmprs - 1);
#endif
ctx->ntmprs = STIX_SMOOI_TO_OOP(ntmprs);
ctx->method_or_nargs = (stix_oop_t)mth;
/* the 'home' field of a method context is always stix->_nil.
@ -472,6 +476,14 @@ static STIX_INLINE int activate_new_method (stix_t* stix, stix_oop_method_t mth)
STIX_ASSERT (stix->sp >= -1);
#if defined(STIX_USE_PROCSTK)
/* when process stack is used, the stack pointer in a context
* is a stack pointer of a process before it is activated */
ctx->sp = STIX_SMOOI_TO_OOP(stix->sp);
#else
/* do nothing */
#endif
/* switch the active context */
SWITCH_ACTIVE_CONTEXT (stix, ctx);
@ -3010,6 +3022,13 @@ printf (">>>>>>>>>>>>>>>> METHOD RETURN FROM WITHIN A BLOCK. NON-LOCAL RETURN..
stix->active_context->origin->ip = STIX_SMOOI_TO_OOP(STIX_SMOOI_MIN);
}
STIX_ASSERT (STIX_CLASSOF(stix, stix->active_context->origin) == stix->_method_context);
#if defined(STIX_USE_PROCSTK)
/* restore the stack pointer */
stix->sp = STIX_OOP_TO_SMOOI(stix->active_context->origin->sp);
#else
/* do nothing */
#endif
SWITCH_ACTIVE_CONTEXT (stix, stix->active_context->origin->sender);
/* push the return value to the stack of the new active context */
@ -3026,17 +3045,12 @@ printf (">>>>>>>>>>>>>>>> METHOD RETURN FROM WITHIN A BLOCK. NON-LOCAL RETURN..
STIX_ASSERT (stix->active_context == stix->processor->active->initial_context);
#if defined(STIX_DEBUG_EXEC_001)
printf ("<<<RETURNIGN TO THE INITIAL CONTEXT>>>\n");
printf ("<<<RETURNIGN TO THE INITIAL CONTEXT>>> TERMINATING SP => %ld\n", (long int)stix->sp);
#endif
printf ("TERMINATING SP.... %ld\n", (long int)stix->sp);
#if defined(STIX_USE_PROCSTK)
/* TODO: */
#else
/* the stack contains the final return value so the stack pointer must be 0. */
STIX_ASSERT (stix->sp == 0);
#endif
if (stix->option.trait & STIX_AWAIT_PROCS)
terminate_process (stix, stix->processor->active);

4
stix/lib/stix.h
View File

@ -500,7 +500,9 @@ struct stix_context_t
/* SmallInteger, instruction pointer */
stix_oop_t ip;
/* SmallInteger, stack pointer */
/* SmallInteger, stack pointer.
* For a method context, this pointer stores the stack pointer
* of the active process before it gets activated. */
stix_oop_t sp;
/* SmallInteger. Number of temporaries.