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* gc.c (set_stack_end): new function to obtain stack end address.

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set_stack_end obtains a stack end address by an address of local
  variable in the function.
  (SET_STACK_END, STACK_END): use set_stack_end.  don't use alloca.
  This makes the conservative garbage collector to scan a stack frame
  of the garbage_collect function itself.  This is required because
  callee-save registers may be stored in the frame.
  [ruby-dev:25158]


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@7545 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
akr 2004-12-13 09:57:41 +00:00
parent ad36c25be8
commit 4497af1591
2 changed files with 22 additions and 10 deletions
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11
ChangeLog
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@ -1,3 +1,14 @@
Mon Dec 13 18:13:52 2004 Tanaka Akira <akr@m17n.org>
* gc.c (set_stack_end): new function to obtain stack end address.
set_stack_end obtains a stack end address by an address of local
variable in the function.
(SET_STACK_END, STACK_END): use set_stack_end. don't use alloca.
This makes the conservative garbage collector to scan a stack frame
of the garbage_collect function itself. This is required because
callee-save registers may be stored in the frame.
[ruby-dev:25158]
Mon Dec 13 02:45:51 2004 Shugo Maeda <shugo@ruby-lang.org> Mon Dec 13 02:45:51 2004 Shugo Maeda <shugo@ruby-lang.org>
* ext/curses/curses.c (window_subwin): call NUM2INT() before * ext/curses/curses.c (window_subwin): call NUM2INT() before

21
gc.c
View File

@ -430,17 +430,18 @@ static unsigned int STACK_LEVEL_MAX = 655300;
# define STACK_LEVEL_MAX 655300 # define STACK_LEVEL_MAX 655300
#endif #endif
#ifdef C_ALLOCA #ifdef __GNUC__
# define SET_STACK_END VALUE stack_end; alloca(0); __attribute__ ((noinline))
# define STACK_END (&stack_end)
#else
# if defined(__GNUC__) && defined(USE_BUILTIN_FRAME_ADDRESS) && !defined(__ia64__)
# define SET_STACK_END VALUE *stack_end = __builtin_frame_address(0)
# else
# define SET_STACK_END VALUE *stack_end = alloca(1)
# endif
# define STACK_END (stack_end)
#endif #endif
static void
set_stack_end(VALUE **stack_end_p)
{
VALUE stack_end;
*stack_end_p = &stack_end;
}
#define SET_STACK_END VALUE *stack_end; set_stack_end(&stack_end)
#define STACK_END (stack_end)
#if defined(sparc) || defined(__sparc__) #if defined(sparc) || defined(__sparc__)
# define STACK_LENGTH (rb_gc_stack_start - STACK_END + 0x80) # define STACK_LENGTH (rb_gc_stack_start - STACK_END + 0x80)
#elif STACK_GROW_DIRECTION < 0 #elif STACK_GROW_DIRECTION < 0