[Webkit-unassigned] [Bug 232373] New: Macro assembler scratchRegister() is unsafe on ARMv7, MIPS and RISCV64

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=232373

            Bug ID: 232373
           Summary: Macro assembler scratchRegister() is unsafe on ARMv7,
                    MIPS and RISCV64
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: glore at igalia.com

Handing out the MacroAssembler scratch register is unsafe on ARMv7, MIPS and RISCV64, because these macro assemblers do not respect the DisallowMacroScratchRegisterUsage RAII exclusion. Existing code happens to work, but is prone to silent errors on change. Example usage:

https://github.com/WebKit/WebKit/blob/4117bbbfeba9d1095ddd152b2ddc876bd8b641cc/Source/JavaScriptCore/bytecode/CallLinkInfo.cpp#L307-L310

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