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From: Jeremy F. <je...@go...> - 2002-11-05 17:32:49
|
On Tue, 2002-11-05 at 03:36, Nicholas Nethercote wrote:
Hi,
Here's a patch implementing the discussed core/skin interface versioning
system. I'm putting it here because I would appreciate some sanity
checking before I commit it; I find this sort of thing easy to get wrong.
The only changes are to VG_(main)() (at the very start) and to
include/vg_skin.h. Existing skins that don't define the new VG_(skin...)
symbols work ok with an updated core (don't ask me why); when both the
skin and the core have been updated it complains if their major version
numbers don't match.
So as I understand it, the idea is that including vg_skin.h will
magically define you a version variable?
Two comments:
- I think it should be called SK_(skin_interface_major_version), just so
that it is obvious who's doing the defining.
- It seems to me that this won't work except for skins with a single
source file. If a skin has multiple sources all of which include
vg_skin.h, won't it end up with multiple definitions of
skin_interface_major_version?
Jeremy, you mentioned using CPP checking, a la:
#if VG_MAJOR_IF_VERSION < 3
#error Need Valgrind version 3
#endif
But I don't quite see how to fit this in; my approach is a little
different. Perhaps I am missing something obvious and it can be done more
simply.
Well, it would be nice to have something a little more explicit that a
bunch of errors about prototype mismatches and missing functions.
J
|
|
From: Nicholas N. <nj...@ca...> - 2002-11-05 11:36:23
|
Hi,
Here's a patch implementing the discussed core/skin interface versioning
system. I'm putting it here because I would appreciate some sanity
checking before I commit it; I find this sort of thing easy to get wrong.
The only changes are to VG_(main)() (at the very start) and to
include/vg_skin.h. Existing skins that don't define the new VG_(skin...)
symbols work ok with an updated core (don't ask me why); when both the
skin and the core have been updated it complains if their major version
numbers don't match.
Jeremy, you mentioned using CPP checking, a la:
#if VG_MAJOR_IF_VERSION < 3
#error Need Valgrind version 3
#endif
But I don't quite see how to fit this in; my approach is a little
different. Perhaps I am missing something obvious and it can be done more
simply.
N
Index: coregrind/vg_main.c
===================================================================
RCS file: /cvsroot/valgrind/valgrind/coregrind/vg_main.c,v
retrieving revision 1.62
diff -C2 -r1.62 vg_main.c
*** coregrind/vg_main.c 3 Nov 2002 11:44:36 -0000 1.62
--- coregrind/vg_main.c 5 Nov 2002 11:26:39 -0000
***************
*** 1319,1322 ****
--- 1319,1342 ----
ThreadState* tst;
+ /* Check skin and core versions are compatible */
+ if (VG_CORE_INTERFACE_MAJOR_VERSION != VG_(skin_interface_major_version)) {
+ VG_(printf)("Error:\n"
+ " Skin and core interface versions do not match.\n"
+ " Interface version used by core is: %d.%d\n"
+ " Interface version used by skin is: %d.%d\n"
+ " The major version numbers must match.\n",
+ VG_CORE_INTERFACE_MAJOR_VERSION,
+ VG_CORE_INTERFACE_MINOR_VERSION,
+ VG_(skin_interface_major_version),
+ VG_(skin_interface_minor_version));
+ VG_(printf)(" You need to at least recompile, and possibly update,\n");
+ if (VG_CORE_INTERFACE_MAJOR_VERSION > VG_(skin_interface_major_version))
+ VG_(printf)(" your skin to work with this version of Valgrind.\n");
+ else
+ VG_(printf)(" your version of Valgrind to work with this skin.\n");
+ VG_(printf)(" Aborting, sorry.\n");
+ VG_(exit)(1);
+ }
+
/* Set up our stack sanity-check words. */
for (i = 0; i < 10; i++) {
Index: include/vg_skin.h
===================================================================
RCS file: /cvsroot/valgrind/valgrind/include/vg_skin.h,v
retrieving revision 1.27
diff -C2 -r1.27 vg_skin.h
*** include/vg_skin.h 27 Oct 2002 20:28:29 -0000 1.27
--- include/vg_skin.h 5 Nov 2002 11:26:39 -0000
***************
*** 107,110 ****
--- 107,135 ----
/*====================================================================*/
+ /*=== Core/skin interface version ===*/
+ /*====================================================================*/
+
+ /* The major version number indicates binary-incompatible changes to the
+ interface; if the core and skin major versions don't match, Valgrind
+ will abort. The minor version indicates binary-compatible changes.
+
+ We don't want the variables themselves in the core, only in the skins,
+ hence the #ifndef. But the core needs to know of their existence, hence
+ the #else branch. Phew.
+ */
+
+ #define VG_CORE_INTERFACE_MAJOR_VERSION 1
+ #define VG_CORE_INTERFACE_MINOR_VERSION 1
+
+ #ifndef __VG_INCLUDE_H
+ const Int VG_(skin_interface_major_version) = VG_CORE_INTERFACE_MAJOR_VERSION;
+ const Int VG_(skin_interface_minor_version) = VG_CORE_INTERFACE_MINOR_VERSION;
+ #else
+ extern const Int VG_(skin_interface_major_version);
+ extern const Int VG_(skin_interface_minor_version);
+ #endif /* __VG_INCLUDE_H */
+
+
+ /*====================================================================*/
/*=== Command-line options ===*/
/*====================================================================*/
|