From 0886a4d8a06a609445f04351dc1e899dd59a3678 Mon Sep 17 00:00:00 2001
From: akr <akr@b2dd03c8-39d4-4d8f-98ff-823fe69b080e>
Date: Sat, 14 Jul 2007 07:19:59 +0000
Subject: * configure.in: add --enable-valgrind.

* gc.h (SET_MACHINE_STACK_END): new macro to replace
  rb_gc_set_stack_end.  it find out accurate stack boundary by
  asm using gcc on x86.

* thread.c (rb_gc_set_stack_end): don't define if asm-version
  SET_MACHINE_STACK_END is available.

* gc.c (mark_current_thread): extracted from garbage_collect.
  it use SET_MACHINE_STACK_END to not scan out of stack area.
  it notify conservative GC information to valgrind if
  --enable-valgrind.


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@12785 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
---
 gc.h | 7 +++++++
 1 file changed, 7 insertions(+)

(limited to 'gc.h')

diff --git a/gc.h b/gc.h
index b0598131a0..c184409027 100644
--- a/gc.h
+++ b/gc.h
@@ -2,7 +2,14 @@
 #ifndef RUBY_GC_H
 #define RUBY_GC_H 1
 
+#if defined(__i386) && defined(__GNUC__)
+#define SET_MACHINE_STACK_END(p) __asm__("mov %%esp, %0" : "=r" (*p))
+#else
 NOINLINE(void rb_gc_set_stack_end(VALUE **stack_end_p));
+#define SET_MACHINE_STACK_END(p) rb_gc_set_stack_end(p)
+#define USE_CONSERVATIVE_STACK_END
+#endif
+
 NOINLINE(void rb_gc_save_machine_context(rb_thread_t *));
 
 /* for GC debug */
-- 
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