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Merge branch 'bug27709_029' into maint-0.2.9
This commit is contained in:
Nick Mathewson
commit
b113399658
4
changes/bug27709
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4
changes/bug27709
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@ -0,0 +1,4 @@
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o Minor bugfixes (code safety):
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- Rewrite our assertion macros so that they no longer suppress
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the compiler's -Wparentheses warnings on their inputs. Fixes bug 27709;
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bugfix on 0.0.6.
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@ -29,6 +29,35 @@
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#error "Sorry; we don't support building with NDEBUG."
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#endif
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#if defined(TOR_UNIT_TESTS) && defined(__GNUC__)
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/* We define this GCC macro as a replacement for PREDICT_UNLIKELY() in this
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* header, so that in our unit test builds, we'll get compiler warnings about
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* stuff like tor_assert(n = 5).
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*
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* The key here is that (e) is wrapped in exactly one layer of parentheses,
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* and then passed right to a conditional. If you do anything else to the
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* expression here, or introduce any more parentheses, the compiler won't
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* help you.
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*
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* We only do this for the unit-test build case because it interferes with
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* the likely-branch labeling. Note below that in the other case, we define
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* these macros to just be synonyms for PREDICT_(UN)LIKELY.
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*/
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#define ASSERT_PREDICT_UNLIKELY_(e) \
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({ \
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int tor__assert_tmp_value__; \
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if (e) \
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tor__assert_tmp_value__ = 1; \
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else \
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tor__assert_tmp_value__ = 0; \
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tor__assert_tmp_value__; \
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})
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#define ASSERT_PREDICT_LIKELY_(e) ASSERT_PREDICT_UNLIKELY_(e)
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#else
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#define ASSERT_PREDICT_UNLIKELY_(e) PREDICT_UNLIKELY(e)
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#define ASSERT_PREDICT_LIKELY_(e) PREDICT_LIKELY(e)
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#endif
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/* Sometimes we don't want to use assertions during branch coverage tests; it
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* leads to tons of unreached branches which in reality are only assertions we
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* didn't hit. */
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@ -40,7 +69,8 @@
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/** Like assert(3), but send assertion failures to the log as well as to
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* stderr. */
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#define tor_assert(expr) STMT_BEGIN \
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if (PREDICT_UNLIKELY(!(expr))) { \
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if (ASSERT_PREDICT_LIKELY_(expr)) { \
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} else { \
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tor_assertion_failed_(SHORT_FILE__, __LINE__, __func__, #expr); \
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abort(); \
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} STMT_END
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@ -77,7 +107,7 @@
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#define tor_assert_nonfatal_unreached_once() tor_assert(0)
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#define tor_assert_nonfatal_once(cond) tor_assert((cond))
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#define BUG(cond) \
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(PREDICT_UNLIKELY(cond) ? \
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(ASSERT_PREDICT_UNLIKELY_(cond) ? \
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(tor_assertion_failed_(SHORT_FILE__,__LINE__,__func__,"!("#cond")"), \
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abort(), 1) \
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: 0)
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@ -86,14 +116,15 @@
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#define tor_assert_nonfatal(cond) ((void)(cond))
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#define tor_assert_nonfatal_unreached_once() STMT_NIL
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#define tor_assert_nonfatal_once(cond) ((void)(cond))
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#define BUG(cond) (PREDICT_UNLIKELY(cond) ? 1 : 0)
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#define BUG(cond) (ASSERT_PREDICT_UNLIKELY_(cond) ? 1 : 0)
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#else /* Normal case, !ALL_BUGS_ARE_FATAL, !DISABLE_ASSERTS_IN_UNIT_TESTS */
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#define tor_assert_nonfatal_unreached() STMT_BEGIN \
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tor_bug_occurred_(SHORT_FILE__, __LINE__, __func__, NULL, 0); \
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STMT_END
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#define tor_assert_nonfatal(cond) STMT_BEGIN \
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if (PREDICT_UNLIKELY(!(cond))) { \
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tor_bug_occurred_(SHORT_FILE__, __LINE__, __func__, #cond, 0); \
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if (ASSERT_PREDICT_LIKELY_(cond)) { \
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} else { \
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tor_bug_occurred_(SHORT_FILE__, __LINE__, __func__, #cond, 0); \
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} \
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STMT_END
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#define tor_assert_nonfatal_unreached_once() STMT_BEGIN \
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@ -105,13 +136,14 @@
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STMT_END
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#define tor_assert_nonfatal_once(cond) STMT_BEGIN \
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static int warning_logged__ = 0; \
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if (!warning_logged__ && PREDICT_UNLIKELY(!(cond))) { \
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if (ASSERT_PREDICT_LIKELY_(cond)) { \
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} else if (!warning_logged__) { \
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warning_logged__ = 1; \
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tor_bug_occurred_(SHORT_FILE__, __LINE__, __func__, #cond, 1); \
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} \
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STMT_END
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#define BUG(cond) \
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(PREDICT_UNLIKELY(cond) ? \
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(ASSERT_PREDICT_UNLIKELY_(cond) ? \
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(tor_bug_occurred_(SHORT_FILE__,__LINE__,__func__,"!("#cond")",0), 1) \
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: 0)
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#endif
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@ -120,17 +152,17 @@
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#define IF_BUG_ONCE__(cond,var) \
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if (( { \
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static int var = 0; \
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int bool_result = (cond); \
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if (PREDICT_UNLIKELY(bool_result) && !var) { \
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int bool_result = !!(cond); \
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if (bool_result && !var) { \
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var = 1; \
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tor_bug_occurred_(SHORT_FILE__, __LINE__, __func__, \
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"!("#cond")", 1); \
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} \
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PREDICT_UNLIKELY(bool_result); } ))
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bool_result; } ))
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#else
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#define IF_BUG_ONCE__(cond,var) \
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static int var = 0; \
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if (PREDICT_UNLIKELY(cond) ? \
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if ((cond) ? \
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(var ? 1 : \
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(var=1, \
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tor_bug_occurred_(SHORT_FILE__, __LINE__, __func__, \
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@ -148,7 +180,7 @@
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*/
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#define IF_BUG_ONCE(cond) \
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IF_BUG_ONCE__((cond), \
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IF_BUG_ONCE__(ASSERT_PREDICT_UNLIKELY_(cond), \
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IF_BUG_ONCE_VARNAME__(__LINE__))
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/** Define this if you want Tor to crash when any problem comes up,
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@ -170,4 +202,3 @@ void tor_set_failed_assertion_callback(void (*fn)(void));
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#endif
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#endif
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