From: hboehm <hboehm>
Date: Tue, 22 Jul 2008 00:29:00 +0000 (+0000)
Subject: 2008-07-21  Hans Boehm <Hans.Boehm@hp.com>
X-Git-Tag: gc7_2alpha2~71
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=1867d249698c81214418b2cf9752a987abb7b4f2;p=gc

2008-07-21  Hans Boehm <Hans.Boehm@hp.com>
	* Makefile.direct, mach_dep.c: Add support for NO_GETCONTEXT.
	* mach_dep.c: Include signal.h.
	* gc_priv.h: Factor out INLINE declaration.
---

diff --git a/ChangeLog b/ChangeLog
index 47e1d3f4..03a3dd58 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2008-07-21  Hans Boehm <Hans.Boehm@hp.com>
+	* Makefile.direct, mach_dep.c: Add support for NO_GETCONTEXT.
+	* mach_dep.c: Include signal.h.
+	* gc_priv.h: Factor out INLINE declaration.
+
 2008-07-03  Hans Boehm <Hans.Boehm@hp.com> (Really mostly Thiemo Seufer)
 
 	* include/private/gcconfig.h: Update MIPS/LINUX config.
diff --git a/Makefile.direct b/Makefile.direct
index 23b0ab36..32112b19 100644
--- a/Makefile.direct
+++ b/Makefile.direct
@@ -320,6 +320,10 @@ HOSTCFLAGS=$(CFLAGS)
 #   since it will scan inactive but cached NPTL thread stacks completely.
 # -DNO_PROC_STAT Causes the collector to avoid relying on Linux'
 #   /proc/self/stat.
+# -DNO_GETCONTEXT Causes the collector to not assume the existence of
+#   the getcontext() function on linux-like platforms.  This currently
+#   happens implicitly on Darwin, Hurd, or ARM or MIPS hardware.
+#   It is explicitly needed for some old versions of FreeBSD.
 #
 
 CXXFLAGS= $(CFLAGS) 
diff --git a/include/private/gc_priv.h b/include/private/gc_priv.h
index 1d96d87c..88c87f6b 100644
--- a/include/private/gc_priv.h
+++ b/include/private/gc_priv.h
@@ -75,9 +75,13 @@ typedef char * ptr_t;	/* A generic pointer to which we can add	*/
 #if __GNUC__ >= 3
 # define EXPECT(expr, outcome) __builtin_expect(expr,outcome)
   /* Equivalent to (expr), but predict that usually (expr)==outcome. */
-# define INLINE inline
 #else
 # define EXPECT(expr, outcome) (expr)
+#endif /* __GNUC__ */
+
+#if __GNUC__ >= 3
+# define INLINE inline
+#else
 # define INLINE
 #endif /* __GNUC__ */
 
diff --git a/mach_dep.c b/mach_dep.c
index d828a71b..e961f433 100644
--- a/mach_dep.c
+++ b/mach_dep.c
@@ -160,9 +160,14 @@ void GC_push_regs()
 #endif
 
 #if !defined(HAVE_PUSH_REGS) && defined(UNIX_LIKE)
+# include <signal.h>
 # include <ucontext.h>
 #endif
 
+#if defined(UNIX_LIKE) && !defined(NO_GETCONTEXT) &&  \
+	(defined(DARWIN) || defined(HURD) || defined(ARM32) || defined(MIPS))
+#  define NO_GETCONTEXT
+#endif
 /* Ensure that either registers are pushed, or callee-save registers	*/
 /* are somewhere on the stack, and then call fn(arg, ctxt).		*/
 /* ctxt is either a pointer to a ucontext_t we generated, or NULL.	*/
@@ -174,8 +179,7 @@ void GC_with_callee_saves_pushed(void (*fn)(ptr_t, void *),
 
 #   if defined(HAVE_PUSH_REGS)
       GC_push_regs();
-#   elif defined(UNIX_LIKE) && !defined(DARWIN) && !defined(ARM32) && \
-	 !defined(MIPS) && !defined(HURD)
+#   elif defined(UNIX_LIKE) && !defined(NO_GETCONTEXT)
       /* Older versions of Darwin seem to lack getcontext(). */
       /* ARM and MIPS Linux often doesn't support a real     */
       /* getcontext(). 					     */