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Re: Always use SVN_ERR_ASSERT [was: svn commit: r1329234 - in /subversion/trunk: ./ subversion/libsvn_delta/compat.c]

From: Julian Foad <julianfoad_at_btopenworld.com>
Date: Mon, 23 Apr 2012 17:18:22 +0100 (BST)

I (Julian Foad) wrote:

> There isn't currently an easy build switch (such as NDEBUG) to disable
> SVN_ERR_ASSERT completely at compile time.  That's just a side issue.  If
> you want such a switch, just ask; we can easily create one.  Or if you think we
> need two levels of assertions -- one for quick tests and another for slow tests
> -- and want to be able to compile-out the slow ones independently of the quick
> ones, just ask.  But implying we should use 'assert' for slow tests and
> 'SVN_ERR_ASSERT' for quick tests is the Wrong Way.

We can also introduce run-time control of whether the conditions are evaluated: test a global 'assertions enabled?' variable or function before evaluating the condition.  For example:

Index: subversion/include/svn_error.h
===================================================================
 #define SVN_ERR_ASSERT(expr)                                            \
   do {                                                                  \
-    if (!(expr))                                                        \
+    if (svn_error__assertions_enabled && !(expr))                       \
       SVN_ERR(svn_error__malfunction(TRUE, __FILE__, __LINE__, #expr)); \
   } while (0)
 
+/* ... */
+extern svn_boolean_t svn_error__assertions_enabled;

- Julian
Received on 2012-04-23 18:18:58 CEST

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