diff options
| author | akr <akr@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2004-12-13 09:58:12 +0000 |
|---|---|---|
| committer | akr <akr@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2004-12-13 09:58:12 +0000 |
| commit | 293534986f336e9f65ba9d8f9f66fcd86607eca7 (patch) | |
| tree | 2e073d3e8fff6dc1b1b93d2fd081495bfa4c5d2b /gc.c | |
| parent | 9b04f5880e475c727c2c019af1d4f96f41dfdd58 (diff) | |
* gc.c (stack_end_address): new function to obtain stack end address.
stack_end_address calls __builtin_frame_address(0) to obtain the
frame pointer of a stack frame of stack_end_address. The address
is the stack pointer of the caller's stack frame.
(SET_STACK_END): use stack_end_address.
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/branches/ruby_1_8@7546 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'gc.c')
| -rw-r--r-- | gc.c | 7 |
1 files changed, 6 insertions, 1 deletions
@@ -432,7 +432,12 @@ static unsigned int STACK_LEVEL_MAX = 655300; # 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) +__attribute__ ((noinline)) static VALUE * +stack_end_address(void) +{ + return (VALUE *)__builtin_frame_address(0); +} +# define SET_STACK_END VALUE *stack_end = stack_end_address() # else # define SET_STACK_END VALUE *stack_end = alloca(1) # endif |