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author | akr <akr@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2004-12-13 09:57:41 +0000 |
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committer | akr <akr@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2004-12-13 09:57:41 +0000 |
commit | 4497af1591dd5936545297a6933d67b0204bc354 (patch) | |
tree | daa84cc5750b7aaf892ebc2046bff97e22317460 /gc.c | |
parent | ad36c25be8094095209212e8529295ad68c1cc62 (diff) | |
download | ruby-4497af1591dd5936545297a6933d67b0204bc354.tar.gz |
* 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]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@7545 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'gc.c')
-rw-r--r-- | gc.c | 21 |
1 files changed, 11 insertions, 10 deletions
@@ -430,17 +430,18 @@ static unsigned int STACK_LEVEL_MAX = 655300; # define STACK_LEVEL_MAX 655300 #endif -#ifdef C_ALLOCA -# define SET_STACK_END VALUE stack_end; alloca(0); -# 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) +#ifdef __GNUC__ +__attribute__ ((noinline)) #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__) # define STACK_LENGTH (rb_gc_stack_start - STACK_END + 0x80) #elif STACK_GROW_DIRECTION < 0 |