[Webkit-unassigned] [Bug 97502] New: JSC: add a debugging utility for the C++ llint backend.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=97502

           Summary: JSC: add a debugging utility for the C++ llint
                    backend.
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: mark.lam at apple.com


Added the "cloopDo" instruction that can be used to insert instrumentation in the llint generated code.  For example, when debugging, we can add the following into a llint ASM file:

    cloopDo // printf("I was here!!!\n");

The llint C++ backend will insert whatever is in the // comment as a C++ statement into the generated LLIntAssembly.h file at the location where we insert this cloopDo instruction into the llint ASM instruction stream.

cloopDo instructions should only be used for debugging the C++ llint.  They should not be left in the llint ASM file when we're done debugging.  Support for the cloopDo instruction is left enabled by default for convenience.  It does not affect the produced code if not used.

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