[Webkit-unassigned] [Bug 174275] New: [JSC] Add support overriding of the runtime error messages without adding new op_codes

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=174275

            Bug ID: 174275
           Summary: [JSC] Add support overriding of the runtime error
                    messages without adding new op_codes
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: gskachkov at gmail.com

JSC should support overriding of the runtime error messages, to show more suitable error message. i.e. https://webkit.org/b/169293. There is expected more such types of modification of already existed error messages and this should be done without adding new op_codes check, to prevent performance degradation.
The idea is use some metadata in CodeBlock, and after throwing check if error message that was thrown from some byte code operation was overridden in CodeBlock metadata.

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