[yuhong]

And they still hasn't properly fixed the JS JIT to comply with Windows x64 ABI including SEH! Interestingly, MS has promised to release their own JS JIT used in Edge and IE as open source.

[vetinari]

Is there a compelling reason for a browser JIT to comply with platform ABI? Third party binaries are not going to be linked in or called from the JIT-ted code anyway.

[yuhong]

Proper SEH support.

[vetinari]

But why? Only sandboxed, JIT-ted js code is going to use this custom ABI. What exceptions do you expect to handle?

[yuhong]

All exceptions including CPU exceptions like divide by zero or access violation uses SEH on Windows.

[pcwalton]

…which you shouldn't be getting in jitcode.