Bug 126007

Summary: Implement a red zone in the JSStack so that we can remove entryChecks.
Product: WebKit Reporter: Mark Lam <mark.lam>
Component: JavaScriptCoreAssignee: Mark Lam <mark.lam>
Status: RESOLVED DUPLICATE    
Severity: Normal CC: fpizlo, ggaren, mhahnenberg, msaboff, oliver
Priority: P2    
Version: 528+ (Nightly build)   
Hardware: Unspecified   
OS: Unspecified   
Bug Depends on:    
Bug Blocks: 125928    

Description Mark Lam 2013-12-19 12:10:08 PST 
Currently, VM entry points in Interpreter.cpp calls JSStack::entryCheck() ensure adequate capacity on the JSStack before re-entering the VM.  We can eliminate this if we implement allow for a red zone in the JSStack.
Comment 1 Geoffrey Garen 2013-12-19 15:01:23 PST 
Let's call this the "host zone", to distinguish from the OS-provided redzone, which is for leaf functions.
Comment 2 Mark Lam 2013-12-23 14:40:31 PST 
It's a bit difficult to get this right with the JSStack internal pointers sometime pointing to the top of stack and sometimes pointing past the end of the stack.  To make the code more sane to reason about, I will first fix https://bugs.webkit.org/show_bug.cgi?id=125849 before returning to this bug.
Comment 3 Mark Lam 2014-01-13 17:10:07 PST 
This was fixed in r161927: <http://trac.webkit.org/r161927> which was committed for https://bugs.webkit.org/show_bug.cgi?id=126790.

*** This bug has been marked as a duplicate of bug 126790 ***