[Webkit-unassigned] [Bug 157080] New: Assertion failure for Reflect.get with Proxy and primitive value as explicit receiver

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=157080

            Bug ID: 157080
           Summary: Assertion failure for Reflect.get with Proxy and
                    primitive value as explicit receiver
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: andre.bargull at gmail.com

SVN: rev200124
Build with: perl Tools/Scripts/build-jsc --gtk --debug


The following test case triggers this assertion error:
---
ASSERTION FAILED: from.isCell() && from.asCell()->JSCell::inherits(std::remove_pointer<To>::type::info())
---


Test case:
---
Reflect.get(new Proxy({}, {}), 0, 1)
---


Stack trace:
---
#0  0x00007ffff6e289ac in WTFCrash () at ../../Source/WTF/wtf/Assertions.cpp:322
#1  0x00007ffff6e289bd in WTFCrashWithSecurityImplication () at ../../Source/WTF/wtf/Assertions.cpp:342
#2  0x00007ffff5fe50be in JSC::jsCast<JSC::JSObject*> (from=...) at ../../Source/JavaScriptCore/runtime/JSCell.h:244
#3  0x00007ffff6cf21c8 in JSC::performProxyGet (exec=0x7fffffffcae0, thisValue=-281474976710655, propertyName=...) at ../../Source/JavaScriptCore/runtime/ProxyObject.cpp:103
#4  0x00007ffff6cebb4e in JSC::PropertySlot::customGetter (this=0x7fffffffca80, exec=0x7fffffffcae0, propertyName=...) at ../../Source/JavaScriptCore/runtime/PropertySlot.cpp:39
#5  0x00000000004423b2 in JSC::PropertySlot::getValue (this=0x7fffffffca80, exec=0x7fffffffcae0, propertyName=...) at ../../Source/JavaScriptCore/runtime/PropertySlot.h:294
#6  0x0000000000448cfb in JSC::JSValue::get (this=0x7fffffffca40, exec=0x7fffffffcae0, propertyName=..., slot=...) at ../../Source/JavaScriptCore/runtime/JSCJSValueInlines.h:768
#7  0x00007ffff6cfc288 in JSC::reflectObjectGet (exec=0x7fffffffcae0) at ../../Source/JavaScriptCore/runtime/ReflectObject.cpp:181
#8  0x00007fffb0bff028 in ?? ()
#9  0x00007fffffffcb60 in ?? ()
#10 0x00007ffff6a33818 in llint_entry () from /home/andre/svn/webkit/WebKitBuild/Debug/lib/libjavascriptcoregtk-4.0.so.18
Backtrace stopped: frame did not save the PC
---

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