[Webkit-unassigned] [Bug 116315] New: DFG speculative JIT

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=116315

           Summary: DFG speculative JIT
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: zhroma at ispras.ru


I found that on ARMv7 Linux, with -mfloat-abi=softfp, v8-splay.js test crashes (segmentation fault). Also stanford-crypto-aes test from Kraken shows wrong results.

The problem happens when calling DFG_OPERATIONs operationArrayPushDouble, operationPutDoubleByValBeyondArrayBoundsStrict, operationPutDoubleByValBeyondArrayBoundsNonStrict. One of their arguments is double, and all of them receive wrong last argument from DFG assembly. I fixed the setupArgumentsWithExecState function to prepare arguments in a proper way (as expected by AAPCS and GCC).

There are two layout tests in the patch:
array-with-double-dfg-push checks push(double) operations,
array-with-double-dfg-assign checks assignment of double element beyond the array bounds.

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