Changeset 238478 in webkit

Timestamp:

Nov 25, 2018, 10:22:30 AM (6 years ago)

Author:

Michael Catanzaro

Message:

CRASH() should call abort() except on Darwin and in developer builds
​https://bugs.webkit.org/show_bug.cgi?id=184408

Reviewed by Daniel Bates.

CRASH() should call abort() except on Darwin and in developer builds, as discussed on
webkit-dev. This should be slightly nicer than dereferencing 0xbadbeef.

On Darwin, CRASH() uses a breakpoint trap, which seems to corrupt the stack on Linux, so we
can't do that.

Continue to call WTFCrash() in developer mode, and make no changes to WTFCrash(), since it
is reportedly useful in nightmare scenarios where core dumps are unavailable.

We also have to define CRASH_UNDER_CONSTEXPR_CONTEXT(). It's a bit odd that it's possible to
use a non-constexpr function here, but it works. Currently this macro uses WTFCrash(), which
is also non-constexpr.

• wtf/Assertions.h:

Location:

trunk/Source/WTF

Files:

• ChangeLog (modified) (1 diff)
• wtf/Assertions.h (modified) (2 diffs)

trunk/Source/WTF/ChangeLog

@@ +1 @@
+2018-11-25  Michael Catanzaro  <mcatanzaro@igalia.com>
+
+        CRASH() should call abort() except on Darwin and in developer builds
+        https://bugs.webkit.org/show_bug.cgi?id=184408
+
+        Reviewed by Daniel Bates.
+
+        CRASH() should call abort() except on Darwin and in developer builds, as discussed on
+        webkit-dev. This should be slightly nicer than dereferencing 0xbadbeef.
+
+        On Darwin, CRASH() uses a breakpoint trap, which seems to corrupt the stack on Linux, so we
+        can't do that.
+
+        Continue to call WTFCrash() in developer mode, and make no changes to WTFCrash(), since it
+        is reportedly useful in nightmare scenarios where core dumps are unavailable.
+
+        We also have to define CRASH_UNDER_CONSTEXPR_CONTEXT(). It's a bit odd that it's possible to
+        use a non-constexpr function here, but it works. Currently this macro uses WTFCrash(), which
+        is also non-constexpr.
+
+        * wtf/Assertions.h:
+
 2018-11-25  Michael Catanzaro  <mcatanzaro@igalia.com>
 

trunk/Source/WTF/wtf/Assertions.h

@@ -45 +45 @@
 #include <stdbool.h>
 #include <stddef.h>
+#include <stdlib.h>
 #include <wtf/ExportMacros.h>
 
@@ -240 +241 @@
     __builtin_unreachable(); \
 } while (0)
+#elif !ENABLE(DEVELOPER_MODE) && !OS(DARWIN)
+#define CRASH() abort()
+#define CRASH_UNDER_CONSTEXPR_CONTEXT() abort()
 #else
 #define CRASH() WTFCrash()