[Webkit-unassigned] [Bug 112816] New: ARMv7 replaceWithJump ASSERT failure after r135330.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=112816

           Summary: ARMv7 replaceWithJump ASSERT failure after r135330.
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Other
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: kilvadyb at homejinni.com
                CC: oliver at apple.com, xan.lopez at gmail.com,
                    barraclough at apple.com, zherczeg at webkit.org,
                    ossy at webkit.org, galpeter at inf.u-szeged.hu,
                    rgabor at webkit.org, cgarcia at igalia.com, fu at mips.com,
                    noam at webkit.org, fpizlo at apple.com,
                    gergely at homejinni.com, palfia at homejinni.com


+++ This bug was initially created as a clone of Bug #103146 +++

Running v8 test v7 with jsc in debug mode on our ARMv7 board I received this ASSERT failure:

Starting program: /data/kilvadyb/webkit-arm/webkit/WebKitBuild/Debug/bin/jsc run.js
[Thread debugging using libthread_db enabled]
[New Thread 0x42dc4400 (LWP 1111)]
Richards: 161
DeltaBlue: 21.8
Crypto: 110
RayTrace: 101
ASSERTION FAILED: canBeJumpT4(instruction, target)
/data/kilvadyb/webkit-arm/webkit/Source/JavaScriptCore/assembler/ARMv7Assembler.h(2475) : static void JSC::ARMv7Assembler::linkJumpT4(uint16_t*, void*)

Program received signal SIGSEGV, Segmentation fault.
0x4040b38c in JSC::ARMv7Assembler::linkJumpT4 (instruction=0x455695f6, target=0x43599dc0)
    at /data/kilvadyb/webkit-arm/webkit/Source/JavaScriptCore/assembler/ARMv7Assembler.h:2475
2475            ASSERT(canBeJumpT4(instruction, target));
(gdb)

I had similar problem on MIPS where a replaceWithJump would be easier to implement with direct jump instead of jump via register.

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