[webkit-dev] PSA: Distinguishing between failed release assertions and other crashes

[Mark Lam]

As I shared in a previous email, I’ll be changing the implementation of WTFCrash() for non-debug OS(DARWIN) builds to use an inlined asm statement that issues a breakpoint instruction.  See https://bugs.webkit.org/show_bug.cgi?id=153996 for details and discussion.  I will be landing this patch shortly.

After this patch lands, for release builds, failed assertions will manifest as a EXC_BREAKPOINT (SIGTRAP).  Failed assertions should be your only source of EXC_BREAKPOINT crashes.
For debug builds, failed assertions will continue to manifest as EXC_BAD_ACCESS (SIGSEGV) on access of invalid address 0xbbadbeef.

Again, this change will only apply to OS(DARWIN) builds.  I’m leaving it up to the linux folks to decide if they also want to adopt this behavior on linux.

Thanks.

Mark