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[tor-commits] [tor/release-0.3.3] Merge branch 'maint-0.2.9' into maint-0.3.3
commit dff7d3d00ad5e3f9e59cd4b11f302601790d1061
Merge: f7e93cf2e b11339965
Author: Nick Mathewson <nickm@xxxxxxxxxxxxxx>
Date: Mon Oct 15 10:37:49 2018 -0400
Merge branch 'maint-0.2.9' into maint-0.3.3
changes/bug27709 | 4 ++++
src/common/util_bug.h | 57 +++++++++++++++++++++++++++++++++++++++------------
2 files changed, 48 insertions(+), 13 deletions(-)
diff --cc src/common/util_bug.h
index be549fde0,f3e5b7c96..c274355f3
--- a/src/common/util_bug.h
+++ b/src/common/util_bug.h
@@@ -53,8 -27,37 +53,37 @@@
* security-critical properties.
*/
#error "Sorry; we don't support building with NDEBUG."
-#endif
+#endif /* defined(NDEBUG) */
+ #if defined(TOR_UNIT_TESTS) && defined(__GNUC__)
+ /* We define this GCC macro as a replacement for PREDICT_UNLIKELY() in this
+ * header, so that in our unit test builds, we'll get compiler warnings about
+ * stuff like tor_assert(n = 5).
+ *
+ * The key here is that (e) is wrapped in exactly one layer of parentheses,
+ * and then passed right to a conditional. If you do anything else to the
+ * expression here, or introduce any more parentheses, the compiler won't
+ * help you.
+ *
+ * We only do this for the unit-test build case because it interferes with
+ * the likely-branch labeling. Note below that in the other case, we define
+ * these macros to just be synonyms for PREDICT_(UN)LIKELY.
+ */
+ #define ASSERT_PREDICT_UNLIKELY_(e) \
+ ({ \
+ int tor__assert_tmp_value__; \
+ if (e) \
+ tor__assert_tmp_value__ = 1; \
+ else \
+ tor__assert_tmp_value__ = 0; \
+ tor__assert_tmp_value__; \
+ })
+ #define ASSERT_PREDICT_LIKELY_(e) ASSERT_PREDICT_UNLIKELY_(e)
+ #else
+ #define ASSERT_PREDICT_UNLIKELY_(e) PREDICT_UNLIKELY(e)
+ #define ASSERT_PREDICT_LIKELY_(e) PREDICT_LIKELY(e)
+ #endif
+
/* Sometimes we don't want to use assertions during branch coverage tests; it
* leads to tons of unreached branches which in reality are only assertions we
* didn't hit. */
@@@ -140,10 -143,10 +172,10 @@@ extern int bug_macro_deadcode_dummy__
} \
STMT_END
#define BUG(cond) \
- (PREDICT_UNLIKELY(cond) ? \
+ (ASSERT_PREDICT_UNLIKELY_(cond) ? \
(tor_bug_occurred_(SHORT_FILE__,__LINE__,__func__,"!("#cond")",0), 1) \
: 0)
-#endif
+#endif /* defined(ALL_BUGS_ARE_FATAL) || ... */
#ifdef __GNUC__
#define IF_BUG_ONCE__(cond,var) \
@@@ -155,11 -158,11 +187,11 @@@
tor_bug_occurred_(SHORT_FILE__, __LINE__, __func__, \
"!("#cond")", 1); \
} \
- PREDICT_UNLIKELY(bool_result); } ))
+ bool_result; } ))
-#else
+#else /* !(defined(__GNUC__)) */
#define IF_BUG_ONCE__(cond,var) \
static int var = 0; \
- if (PREDICT_UNLIKELY(cond) ? \
+ if ((cond) ? \
(var ? 1 : \
(var=1, \
tor_bug_occurred_(SHORT_FILE__, __LINE__, __func__, \
@@@ -196,7 -199,6 +228,6 @@@ void tor_capture_bugs_(int n)
void tor_end_capture_bugs_(void);
const struct smartlist_t *tor_get_captured_bug_log_(void);
void tor_set_failed_assertion_callback(void (*fn)(void));
-#endif
+#endif /* defined(TOR_UNIT_TESTS) */
-#endif
+#endif /* !defined(TOR_UTIL_BUG_H) */
-
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