[Webkit-unassigned] [Bug 65830] New: DFG JIT verbose mode does not report the generated types of nodes

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=65830

           Summary: DFG JIT verbose mode does not report the generated
                    types of nodes
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: fpizlo at apple.com


The DFG JIT has a verbose mode that is intended for debugging, where it currently dumps the IR and the machine code offsets at which nodes in the IR were generated.  The IR is mostly untyped, with types being selected on-the-fly in the backend.  But the backend does not report the types that are selected for nodes, making it difficult to reason about what kind of code the JIT is emitting unless a machine code dump is produced.  The simplest solution is to have the DFG backends (both speculative and non-speculative) dump the DataFormat selected for the register into which the result of each node is placed.

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