Re: Problems with <setjmp.h> and libguile/__scm.h on HP-UX/IA64

[Neil Jerram <neil@ossau.uklinux.net>]

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Neil Jerram <neil@ossau.uklinux.net> writes:

> Albert Chin <guile-devel@mlists.thewrittenword.com> writes:

>> But, on HP-UX/IA64, <setjmp.h> has a conflicting declaration of jmp_buf.
>
> Thanks for the report.  This is also a Debian bug [1], and their patch
> is [2].
>
> [1] http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=506684
> [2] http://patch-tracking.debian.net/patch/series/view/guile-1.8/1.8.5+1-4.1/dont-redefine-jmp_buf.diff

Here's my proposed fix for this, for 1.8 and master.  Please let me
know of any comments.

     Neil


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From 26adbdf1ea98e20124f44960a8e0dfa302306991 Mon Sep 17 00:00:00 2001
From: Neil Jerram <neil@ossau.uklinux.net>
Date: Wed, 5 Aug 2009 16:13:28 +0100
Subject: [PATCH] Avoid clash with system setjmp/longjmp on IA64

Problem was that if an application includes both libguile.h and the
system's setjmp.h, and is compiled on IA64, it gets compile errors
because of jmp_buf, setjmp and longjmp being multiply defined.

* libguile/__scm.h (__ia64__): Define scm_i_jmp_buf, SCM_I_SETJMP and
  SCM_I_LONGJMP instead of jmp_buf, setjmp and longjmp.

  (all other platforms): Map scm_i_jmp_buf, SCM_I_SETJMP and
  SCM_I_LONGJMP to jmp_buf, setjmp and longjmp.

* libguile/continuations.c (scm_make_continuation): Use `SCM_I_SETJMP'
  instead of `setjmp'.
  (copy_stack_and_call): Use `SCM_I_LONJMP' instead of `longjmp'.
  (scm_ia64_longjmp): Use type `scm_i_jmp_buf' instead of `jmp_buf'.

* libguile/continuations.h (scm_t_contregs): Use type `scm_i_jmp_buf'
  instead of `jmp_buf'.

* libguile/threads.c (suspend): Use `SCM_I_SETJMP' instead of
  `setjmp'.

* libguile/threads.h (scm_i_thread): Use type `scm_i_jmp_buf' instead
  of `jmp_buf'.

* libguile/throw.c (JBJMPBUF, make_jmpbuf, jmp_buf_and_retval): Use
  type `scm_i_jmp_buf' instead of `jmp_buf'.
  (scm_c_catch): Use `SCM_I_SETJMP' instead of `setjmp'.
  (scm_ithrow): Use `SCM_I_LONGJMP' instead of `longjmp'.
---
 libguile/__scm.h         |   17 +++++++++++++----
 libguile/continuations.c |    6 +++---
 libguile/continuations.h |    2 +-
 libguile/threads.c       |    6 +++---
 libguile/threads.h       |    2 +-
 libguile/throw.c         |   10 +++++-----
 6 files changed, 26 insertions(+), 17 deletions(-)

diff --git a/libguile/__scm.h b/libguile/__scm.h
index 29b371d..6782654 100644
--- a/libguile/__scm.h
+++ b/libguile/__scm.h
@@ -423,19 +423,28 @@
     typedef struct {
       ucontext_t ctx;
       int fresh;
-    } jmp_buf;
-#   define setjmp(JB)				        \
+    } scm_i_jmp_buf;
+#   define SCM_I_SETJMP(JB)			        \
       ( (JB).fresh = 1,				        \
         getcontext (&((JB).ctx)),			\
         ((JB).fresh ? ((JB).fresh = 0, 0) : 1) )
-#   define longjmp(JB,VAL) scm_ia64_longjmp (&(JB), VAL)
-    void scm_ia64_longjmp (jmp_buf *, int);
+#   define SCM_I_LONGJMP(JB,VAL) scm_ia64_longjmp (&(JB), VAL)
+    void scm_ia64_longjmp (scm_i_jmp_buf *, int);
 #  else                 	/* ndef __ia64__ */
 #   include <setjmp.h>
 #  endif			/* ndef __ia64__ */
 # endif				/* ndef _CRAY1 */
 #endif				/* ndef vms */
 
+/* For any platform where SCM_I_SETJMP hasn't been defined in some
+   special way above, map SCM_I_SETJMP, SCM_I_LONGJMP and
+   scm_i_jmp_buf to setjmp, longjmp and jmp_buf. */
+#ifndef SCM_I_SETJMP
+#define scm_i_jmp_buf jmp_buf
+#define SCM_I_SETJMP setjmp
+#define SCM_I_LONGJMP longjmp
+#endif
+
 /* James Clark came up with this neat one instruction fix for
  * continuations on the SPARC.  It flushes the register windows so
  * that all the state of the process is contained in the stack.
diff --git a/libguile/continuations.c b/libguile/continuations.c
index f856476..347bd80 100644
--- a/libguile/continuations.c
+++ b/libguile/continuations.c
@@ -131,7 +131,7 @@ scm_make_continuation (int *first)
 
   SCM_NEWSMOB (cont, scm_tc16_continuation, continuation);
 
-  *first = !setjmp (continuation->jmpbuf);
+  *first = !SCM_I_SETJMP (continuation->jmpbuf);
   if (*first)
     {
 #ifdef __ia64__
@@ -229,12 +229,12 @@ copy_stack_and_call (scm_t_contregs *continuation, SCM val,
   scm_i_set_last_debug_frame (continuation->dframe);
 
   continuation->throw_value = val;
-  longjmp (continuation->jmpbuf, 1);
+  SCM_I_LONGJMP (continuation->jmpbuf, 1);
 }
 
 #ifdef __ia64__
 void
-scm_ia64_longjmp (jmp_buf *JB, int VAL)
+scm_ia64_longjmp (scm_i_jmp_buf *JB, int VAL)
 {
   scm_i_thread *t = SCM_I_CURRENT_THREAD;
 
diff --git a/libguile/continuations.h b/libguile/continuations.h
index 08eec8f..82cf178 100644
--- a/libguile/continuations.h
+++ b/libguile/continuations.h
@@ -44,7 +44,7 @@ SCM_API scm_t_bits scm_tc16_continuation;
 typedef struct 
 {
   SCM throw_value;
-  jmp_buf jmpbuf;
+  scm_i_jmp_buf jmpbuf;
   SCM dynenv;
 #ifdef __ia64__
   void *backing_store;
diff --git a/libguile/threads.c b/libguile/threads.c
index 9589336..1721e0b 100644
--- a/libguile/threads.c
+++ b/libguile/threads.c
@@ -312,7 +312,7 @@ unblock_from_queue (SCM queue)
       var 't'
       // save registers.
       SCM_FLUSH_REGISTER_WINDOWS;      // sparc only
-      setjmp (t->regs);                // here's most of the magic
+      SCM_I_SETJMP (t->regs);          // here's most of the magic
 
    ... and returns.
 
@@ -366,7 +366,7 @@ unblock_from_queue (SCM queue)
       t->top = SCM_STACK_PTR (&t);
       // save registers.
       SCM_FLUSH_REGISTER_WINDOWS;
-      setjmp (t->regs);
+      SCM_I_SETJMP (t->regs);
       res = func(data);
       scm_enter_guile (t);
 
@@ -425,7 +425,7 @@ suspend (void)
   t->top = SCM_STACK_PTR (&t);
   /* save registers. */
   SCM_FLUSH_REGISTER_WINDOWS;
-  setjmp (t->regs);
+  SCM_I_SETJMP (t->regs);
   return t;
 }
 
diff --git a/libguile/threads.h b/libguile/threads.h
index 32b0ea6..9a1b6f0 100644
--- a/libguile/threads.h
+++ b/libguile/threads.h
@@ -123,7 +123,7 @@ typedef struct scm_i_thread {
   SCM vm;
   SCM_STACKITEM *base;
   SCM_STACKITEM *top;
-  jmp_buf regs;
+  scm_i_jmp_buf regs;
 #ifdef __ia64__
   void *register_backing_store_base;
   scm_t_contregs *pending_rbs_continuation;
diff --git a/libguile/throw.c b/libguile/throw.c
index b48bea1..4413efa 100644
--- a/libguile/throw.c
+++ b/libguile/throw.c
@@ -59,7 +59,7 @@ static scm_t_bits tc16_jmpbuffer;
 #define DEACTIVATEJB(x) \
   (SCM_SET_CELL_WORD_0 ((x), (SCM_CELL_WORD_0 (x) & ~(1L << 16L))))
 
-#define JBJMPBUF(OBJ)           ((jmp_buf *) SCM_CELL_WORD_1 (OBJ))
+#define JBJMPBUF(OBJ)           ((scm_i_jmp_buf *) SCM_CELL_WORD_1 (OBJ))
 #define SETJBJMPBUF(x, v)        (SCM_SET_CELL_WORD_1 ((x), (scm_t_bits) (v)))
 #define SCM_JBDFRAME(x)         ((scm_t_debug_frame *) SCM_CELL_WORD_2 (x))
 #define SCM_SETJBDFRAME(x, v)    (SCM_SET_CELL_WORD_2 ((x), (scm_t_bits) (v)))
@@ -81,7 +81,7 @@ make_jmpbuf (void)
 {
   SCM answer;
   SCM_NEWSMOB2 (answer, tc16_jmpbuffer, 0, 0);
-  SETJBJMPBUF(answer, (jmp_buf *)0);
+  SETJBJMPBUF(answer, (scm_i_jmp_buf *)0);
   DEACTIVATEJB(answer);
   return answer;
 }
@@ -91,7 +91,7 @@ make_jmpbuf (void)
 
 struct jmp_buf_and_retval	/* use only on the stack, in scm_catch */
 {
-  jmp_buf buf;			/* must be first */
+  scm_i_jmp_buf buf;		/* must be first */
   SCM throw_tag;
   SCM retval;
 };
@@ -194,7 +194,7 @@ scm_c_catch (SCM tag,
   pre_unwind.lazy_catch_p = 0;
   SCM_SETJBPREUNWIND(jmpbuf, &pre_unwind);
 
-  if (setjmp (jbr.buf))
+  if (SCM_I_SETJMP (jbr.buf))
     {
       SCM throw_tag;
       SCM throw_args;
@@ -884,7 +884,7 @@ scm_ithrow (SCM key, SCM args, int noreturn SCM_UNUSED)
       jbr->throw_tag = key;
       jbr->retval = args;
       scm_i_set_last_debug_frame (SCM_JBDFRAME (jmpbuf));
-      longjmp (*JBJMPBUF (jmpbuf), 1);
+      SCM_I_LONGJMP (*JBJMPBUF (jmpbuf), 1);
     }
 
   /* Otherwise, it's some random piece of junk.  */
-- 
1.5.6.5