A64: Synchronize with r16024.

src/objects.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1030 matching lines @@
   V(MapCache)                                  \
   V(Primitive)                                 \
   V(GlobalObject)                              \
   V(JSGlobalObject)                            \
   V(JSBuiltinsObject)                          \
   V(JSGlobalProxy)                             \
   V(UndetectableObject)                        \
   V(AccessCheckNeeded)                         \
   V(Cell)                                      \
   V(PropertyCell)                              \
-  V(ObjectHashTable)                           \
+  V(ObjectHashTable)
+
+
+#define ERROR_MESSAGES_LIST(V) \
+  V(kNoReason, "no reason")                                                   \
+                                                                              \
+  V(k32BitValueInRegisterIsNotZeroExtended,                                   \
+    "32 bit value in register is not zero-extended")                          \
+  V(kAlignmentMarkerExpected, "alignment marker expected")                    \
+  V(kAllocationIsNotDoubleAligned, "Allocation is not double aligned")        \
+  V(kAPICallReturnedInvalidObject, "API call returned invalid object")        \
+  V(kArgumentsObjectValueInATestContext,                                      \
+    "arguments object value in a test context")                               \
+  V(kArrayBoilerplateCreationFailed, "array boilerplate creation failed")     \
+  V(kArrayIndexConstantValueTooBig, "array index constant value too big")     \
+  V(kAssignmentToArguments, "assignment to arguments")                        \
+  V(kAssignmentToLetVariableBeforeInitialization,                             \
+    "assignment to let variable before initialization")                       \
+  V(kAssignmentToLOOKUPVariable, "assignment to LOOKUP variable")             \
+  V(kAssignmentToParameterFunctionUsesArgumentsObject,                        \
+    "assignment to parameter, function uses arguments object")                \
+  V(kAssignmentToParameterInArgumentsObject,                                  \
+    "assignment to parameter in arguments object")                            \
+  V(kAttemptToUseUndefinedCache, "Attempt to use undefined cache")            \
+  V(kBadValueContextForArgumentsObjectValue,                                  \
+    "bad value context for arguments object value")                           \
+  V(kBadValueContextForArgumentsValue,                                        \
+    "bad value context for arguments value")                                  \
+  V(kBailedOutDueToDependentMap, "bailed out due to dependent map")           \
+  V(kBailoutWasNotPrepared, "bailout was not prepared")                       \
+  V(kBinaryStubGenerateFloatingPointCode,                                     \
+    "BinaryStub_GenerateFloatingPointCode")                                   \
+  V(kBothRegistersWereSmisInSelectNonSmi,                                     \
+    "Both registers were smis in SelectNonSmi")                               \
+  V(kCallToAJavaScriptRuntimeFunction,                                        \
+    "call to a JavaScript runtime function")                                  \
+  V(kCannotTranslatePositionInChangedArea,                                    \
+    "Cannot translate position in changed area")                              \
+  V(kCodeGenerationFailed, "code generation failed")                          \
+  V(kCodeObjectNotProperlyPatched, "code object not properly patched")        \
+  V(kCompoundAssignmentToLookupSlot, "compound assignment to lookup slot")    \
+  V(kContextAllocatedArguments, "context-allocated arguments")                \
+  V(kCouldNotGenerateZero, "could not generate +0.0")                         \
+  V(kCouldNotGenerateNegativeZero, "could not generate -0.0")                 \
+  V(kDebuggerIsActive, "debugger is active")                                  \
+  V(kDebuggerStatement, "DebuggerStatement")                                  \
+  V(kDeclarationInCatchContext, "Declaration in catch context")               \
+  V(kDeclarationInWithContext, "Declaration in with context")                 \
+  V(kDefaultNaNModeNotSet, "Default NaN mode not set")                        \
+  V(kDeleteWithGlobalVariable, "delete with global variable")                 \
+  V(kDeleteWithNonGlobalVariable, "delete with non-global variable")          \
+  V(kDestinationOfCopyNotAligned, "Destination of copy not aligned")          \
+  V(kDontDeleteCellsCannotContainTheHole,                                     \
+    "DontDelete cells can't contain the hole")                                \
+  V(kDoPushArgumentNotImplementedForDoubleType,                               \
+    "DoPushArgument not implemented for double type")                         \
+  V(kEmitLoadRegisterUnsupportedDoubleImmediate,                              \
+    "EmitLoadRegister: Unsupported double immediate")                         \
+  V(kEval, "eval")                                                            \
+  V(kExpected0AsASmiSentinel, "Expected 0 as a Smi sentinel")                 \
+  V(kExpectedAlignmentMarker, "expected alignment marker")                    \
+  V(kExpectedNonIdenticalObjects, "expected non-identical objects")           \
+  V(kExpectedPositiveZero, "expected +0.0")                                   \
+  V(kExpectedPropertyCellInTypeInfoCell,                                      \
+    "Expected property cell in type_info_cell")                               \
+  V(kExpectedPropertyCellInRegisterA2,                                        \
+    "Expected property cell in register a2")                                  \
+  V(kExpectedPropertyCellInRegisterEbx,                                       \
+    "Expected property cell in register ebx")                                 \
+  V(kExpectedPropertyCellInRegisterRbx,                                       \
+    "Expected property cell in register rbx")                                 \
+  V(kExpectedSmiOrHeapNumber, "expected smi or HeapNumber")                   \
+  V(kExpectingAlignmentForCopyBytes,                                          \
+    "Expecting alignment for CopyBytes")                                      \
+  V(kExternalStringExpectedButNotFound,                                       \
+    "external string expected, but not found")                                \
+  V(kFailedBailedOutLastTime, "failed/bailed out last time")                  \
+  V(kForInStatementIsNotFastCase, "ForInStatement is not fast case")          \
+  V(kForInStatementOptimizationIsDisabled,                                    \
+    "ForInStatement optimization is disabled")                                \
+  V(kForInStatementWithNonLocalEachVariable,                                  \
+    "ForInStatement with non-local each variable")                            \
+  V(kForOfStatement, "ForOfStatement")                                        \
+  V(kFrameIsExpectedToBeAligned, "frame is expected to be aligned")           \
+  V(kFunctionCallsEval, "function calls eval")                                \
+  V(kFunctionIsAGenerator, "function is a generator")                         \
+  V(kFunctionWithIllegalRedeclaration, "function with illegal redeclaration") \
+  V(kGeneratedCodeIsTooLarge, "Generated code is too large")                  \
+  V(kGeneratorFailedToResume, "Generator failed to resume")                   \
+  V(kGenerator, "generator")                                                  \
+  V(kGlobalFunctionsMustHaveInitialMap,                                       \
+    "Global functions must have initial map")                                 \
+  V(kHeapNumberMapRegisterClobbered, "HeapNumberMap register clobbered")      \
+  V(kImproperObjectOnPrototypeChainForStore,                                  \
+    "improper object on prototype chain for store")                           \
+  V(kIndexIsNegative, "Index is negative")                                    \
+  V(kIndexIsTooLarge, "Index is too large")                                   \
+  V(kInlinedRuntimeFunctionClassOf, "inlined runtime function: ClassOf")      \
+  V(kInlinedRuntimeFunctionFastAsciiArrayJoin,                                \
+    "inlined runtime function: FastAsciiArrayJoin")                           \
+  V(kInlinedRuntimeFunctionGeneratorNext,                                     \
+    "inlined runtime function: GeneratorNext")                                \
+  V(kInlinedRuntimeFunctionGeneratorThrow,                                    \
+    "inlined runtime function: GeneratorThrow")                               \
+  V(kInlinedRuntimeFunctionGetFromCache,                                      \
+    "inlined runtime function: GetFromCache")                                 \
+  V(kInlinedRuntimeFunctionIsNonNegativeSmi,                                  \
+    "inlined runtime function: IsNonNegativeSmi")                             \
+  V(kInlinedRuntimeFunctionIsRegExpEquivalent,                                \
+    "inlined runtime function: IsRegExpEquivalent")                           \
+  V(kInlinedRuntimeFunctionIsStringWrapperSafeForDefaultValueOf,              \
+    "inlined runtime function: IsStringWrapperSafeForDefaultValueOf")         \
+  V(kInliningBailedOut, "inlining bailed out")                                \
+  V(kInputGPRIsExpectedToHaveUpper32Cleared,                                  \
+    "input GPR is expected to have upper32 cleared")                          \
+  V(kInstanceofStubUnexpectedCallSiteCacheCheck,                              \
+    "InstanceofStub unexpected call site cache (check)")                      \
+  V(kInstanceofStubUnexpectedCallSiteCacheCmp1,                               \
+    "InstanceofStub unexpected call site cache (cmp 1)")                      \
+  V(kInstanceofStubUnexpectedCallSiteCacheCmp2,                               \
+    "InstanceofStub unexpected call site cache (cmp 2)")                      \
+  V(kInstanceofStubUnexpectedCallSiteCacheMov,                                \
+    "InstanceofStub unexpected call site cache (mov)")                        \
+  V(kInteger32ToSmiFieldWritingToNonSmiLocation,                              \
+    "Integer32ToSmiField writing to non-smi location")                        \
+  V(kInvalidCaptureReferenced, "Invalid capture referenced")                  \
+  V(kInvalidElementsKindForInternalArrayOrInternalPackedArray,                \
+    "Invalid ElementsKind for InternalArray or InternalPackedArray")          \
+  V(kInvalidFullCodegenState, "invalid full-codegen state")                   \
+  V(kInvalidHandleScopeLevel, "Invalid HandleScope level")                    \
+  V(kInvalidLeftHandSideInAssignment, "invalid left-hand side in assignment") \
+  V(kInvalidLhsInCompoundAssignment, "invalid lhs in compound assignment")    \
+  V(kInvalidLhsInCountOperation, "invalid lhs in count operation")            \
+  V(kInvalidMinLength, "Invalid min_length")                                  \
+  V(kJSGlobalObjectNativeContextShouldBeANativeContext,                       \
+    "JSGlobalObject::native_context should be a native context")              \
+  V(kJSGlobalProxyContextShouldNotBeNull,                                     \
+    "JSGlobalProxy::context() should not be null")                            \
+  V(kJSObjectWithFastElementsMapHasSlowElements,                              \
+    "JSObject with fast elements map has slow elements")                      \
+  V(kLetBindingReInitialization, "Let binding re-initialization")             \
+  V(kLhsHasBeenClobbered, "lhs has been clobbered")                           \
+  V(kLiveBytesCountOverflowChunkSize, "Live Bytes Count overflow chunk size") \
+  V(kLiveEditFrameDroppingIsNotSupportedOnA64,                                \
+    "LiveEdit frame dropping is not supported on a64")                        \
+  V(kLiveEditFrameDroppingIsNotSupportedOnArm,                                \
+    "LiveEdit frame dropping is not supported on arm")                        \
+  V(kLiveEditFrameDroppingIsNotSupportedOnMips,                               \
+    "LiveEdit frame dropping is not supported on mips")                       \
+  V(kLiveEdit, "LiveEdit")                                                    \
+  V(kLookupVariableInCountOperation,                                          \
+    "lookup variable in count operation")                                     \
+  V(kMapIsNoLongerInEax, "Map is no longer in eax")                           \
+  V(kNoCasesLeft, "no cases left")                                            \
+  V(kNoEmptyArraysHereInEmitFastAsciiArrayJoin,                               \
+    "No empty arrays here in EmitFastAsciiArrayJoin")                         \
+  V(kNonInitializerAssignmentToConst,                                         \
+    "non-initializer assignment to const")                                    \
+  V(kNonSmiIndex, "Non-smi index")                                            \
+  V(kNonSmiKeyInArrayLiteral, "Non-smi key in array literal")                 \
+  V(kNonSmiValue, "Non-smi value")                                            \
+  V(kNotEnoughVirtualRegistersForValues,                                      \
+    "not enough virtual registers for values")                                \
+  V(kNotEnoughVirtualRegistersRegalloc,                                       \
+    "not enough virtual registers (regalloc)")                                \
+  V(kObjectFoundInSmiOnlyArray, "object found in smi-only array")             \
+  V(kObjectLiteralWithComplexProperty,                                        \
+    "Object literal with complex property")                                   \
+  V(kOddballInStringTableIsNotUndefinedOrTheHole,                             \
+    "oddball in string table is not undefined or the hole")                   \
+  V(kOperandIsASmiAndNotAName, "Operand is a smi and not a name")             \
+  V(kOperandIsASmiAndNotAString, "Operand is a smi and not a string")         \
+  V(kOperandIsASmi, "Operand is a smi")                                       \
+  V(kOperandIsNotAName, "Operand is not a name")                              \
+  V(kOperandIsNotANumber, "Operand is not a number")                          \
+  V(kOperandIsNotASmi, "Operand is not a smi")                                \
+  V(kOperandIsNotAString, "Operand is not a string")                          \
+  V(kOperandIsNotSmi, "Operand is not smi")                                   \
+  V(kOperandNotANumber, "Operand not a number")                               \
+  V(kOptimizedTooManyTimes, "optimized too many times")                       \
+  V(kOutOfVirtualRegistersWhileTryingToAllocateTempRegister,                  \
+    "Out of virtual registers while trying to allocate temp register")        \
+  V(kParseScopeError, "parse/scope error")                                    \
+  V(kPossibleDirectCallToEval, "possible direct call to eval")                \
+  V(kPreconditionsWereNotMet, "preconditions were not met")                   \
+  V(kPropertyAllocationCountFailed, "Property allocation count failed")       \
+  V(kReceivedInvalidReturnAddress, "Received invalid return address")         \
+  V(kReferenceToAVariableWhichRequiresDynamicLookup,                          \
+    "reference to a variable which requires dynamic lookup")                  \
+  V(kReferenceToGlobalLexicalVariable,                                        \
+    "reference to global lexical variable")                                   \
+  V(kReferenceToUninitializedVariable, "reference to uninitialized variable") \
+  V(kRegisterDidNotMatchExpectedRoot, "Register did not match expected root") \
+  V(kRegisterWasClobbered, "register was clobbered")                          \
+  V(kReturnAddressNotFoundInFrame, "return address not found in frame")       \
+  V(kRhsHasBeenClobbered, "rhs has been clobbered")                           \
+  V(kScopedBlock, "ScopedBlock")                                              \
+  V(kSharedFunctionInfoLiteral, "SharedFunctionInfoLiteral")                  \
+  V(kSmiAdditionOverflow, "Smi addition overflow")                            \
+  V(kSmiSubtractionOverflow, "Smi subtraction overflow")                      \
+  V(kStackAccessBelowStackPointer, "stack access below stack pointer")        \
+  V(kStackFrameTypesMustMatch, "stack frame types must match")                \
+  V(kSwitchStatementMixedOrNonLiteralSwitchLabels,                            \
+    "SwitchStatement: mixed or non-literal switch labels")                    \
+  V(kSwitchStatementTooManyClauses, "SwitchStatement: too many clauses")      \
+  V(kTheCurrentStackPointerIsBelowCsp,                                        \
+    "the current stack pointer is below csp")                                 \
+  V(kTheInstructionShouldBeALui, "The instruction should be a lui")           \
+  V(kTheInstructionShouldBeAnOri, "The instruction should be an ori")         \
+  V(kTheInstructionToPatchShouldBeALoadFromPc,                                \
+    "The instruction to patch should be a load from pc")                      \
+  V(kTheInstructionToPatchShouldBeALui,                                       \
+    "The instruction to patch should be a lui")                               \
+  V(kTheInstructionToPatchShouldBeAnOri,                                      \
+    "The instruction to patch should be an ori")                              \
+  V(kTheSourceAndDestinationAreTheSame,                                       \
+    "the source and destination are the same")                                \
+  V(kTheStackWasCorruptedByMacroAssemblerCall,                                \
+    "the stack was corrupted by MacroAssembler::Call()")                      \
+  V(kTooManyParametersLocals, "too many parameters/locals")                   \
+  V(kTooManyParameters, "too many parameters")                                \
+  V(kTooManySpillSlotsNeededForOSR, "Too many spill slots needed for OSR")    \
+  V(kToOperandIsDoubleRegisterUnimplemented,                                  \
+    "ToOperand IsDoubleRegister unimplemented")                               \
+  V(kToOperandUnsupportedDoubleImmediate,                                     \
+    "ToOperand Unsupported double immediate")                                 \
+  V(kTryCatchStatement, "TryCatchStatement")                                  \
+  V(kTryFinallyStatement, "TryFinallyStatement")                              \
+  V(kUnableToEncodeValueAsSmi, "Unable to encode value as smi")               \
+  V(kUnalignedAllocationInNewSpace, "Unaligned allocation in new space")      \
+  V(kUndefinedValueNotLoaded, "Undefined value not loaded")                   \
+  V(kUndoAllocationOfNonAllocatedMemory,                                      \
+    "Undo allocation of non allocated memory")                                \
+  V(kUnexpectedAllocationTop, "Unexpected allocation top")                    \
+  V(kUnexpectedElementsKindInArrayConstructor,                                \
+    "Unexpected ElementsKind in array constructor")                           \
+  V(kUnexpectedFallthroughFromCharCodeAtSlowCase,                             \
+    "Unexpected fallthrough from CharCodeAt slow case")                       \
+  V(kUnexpectedFallthroughFromCharFromCodeSlowCase,                           \
+    "Unexpected fallthrough from CharFromCode slow case")                     \
+  V(kUnexpectedFallThroughFromStringComparison,                               \
+    "Unexpected fall-through from string comparison")                         \
+  V(kUnexpectedFallThroughInBinaryStubGenerateFloatingPointCode,              \
+    "Unexpected fall-through in BinaryStub_GenerateFloatingPointCode")        \
+  V(kUnexpectedFallthroughToCharCodeAtSlowCase,                               \
+    "Unexpected fallthrough to CharCodeAt slow case")                         \
+  V(kUnexpectedFallthroughToCharFromCodeSlowCase,                             \
+    "Unexpected fallthrough to CharFromCode slow case")                       \
+  V(kUnexpectedFPUStackDepthAfterInstruction,                                 \
+    "Unexpected FPU stack depth after instruction")                           \
+  V(kUnexpectedInitialMapForArrayFunction1,                                   \
+    "Unexpected initial map for Array function (1)")                          \
+  V(kUnexpectedInitialMapForArrayFunction2,                                   \
+    "Unexpected initial map for Array function (2)")                          \
+  V(kUnexpectedInitialMapForArrayFunction,                                    \
+    "Unexpected initial map for Array function")                              \
+  V(kUnexpectedInitialMapForInternalArrayFunction,                            \
+    "Unexpected initial map for InternalArray function")                      \
+  V(kUnexpectedLevelAfterReturnFromApiCall,                                   \
+    "Unexpected level after return from api call")                            \
+  V(kUnexpectedNumberOfPreAllocatedPropertyFields,                            \
+    "Unexpected number of pre-allocated property fields")                     \
+  V(kUnexpectedStringFunction, "Unexpected String function")                  \
+  V(kUnexpectedStringType, "Unexpected string type")                          \
+  V(kUnexpectedStringWrapperInstanceSize,                                     \
+    "Unexpected string wrapper instance size")                                \
+  V(kUnexpectedTypeForRegExpDataFixedArrayExpected,                           \
+    "Unexpected type for RegExp data, FixedArray expected")                   \
+  V(kUnexpectedUnusedPropertiesOfStringWrapper,                               \
+    "Unexpected unused properties of string wrapper")                         \
+  V(kUnimplementedHydrogenInstruction,                                        \
+    "unimplemented Hydrogen instruction")                                     \
+  V(kUninitializedKSmiConstantRegister, "Uninitialized kSmiConstantRegister") \
+  V(kUnknown, "unknown")                                                      \
+  V(kUnsupportedConstCompoundAssignment,                                      \
+    "unsupported const compound assignment")                                  \
+  V(kUnsupportedCountOperationWithConst,                                      \
+    "unsupported count operation with const")                                 \
+  V(kUnsupportedDoubleImmediate, "unsupported double immediate")              \
+  V(kUnsupportedLetCompoundAssignment, "unsupported let compound assignment") \
+  V(kUnsupportedLookupSlotInDeclaration,                                      \
+    "unsupported lookup slot in declaration")                                 \
+  V(kUnsupportedNonPrimitiveCompare, "Unsupported non-primitive compare")     \
+  V(kUnsupportedPhiUseOfArguments, "Unsupported phi use of arguments")        \
+  V(kUnsupportedPhiUseOfConstVariable,                                        \
+    "Unsupported phi use of const variable")                                  \
+  V(kUnsupportedTaggedImmediate, "unsupported tagged immediate")              \
+  V(kVariableResolvedToWithContext, "Variable resolved to with context")      \
+  V(kWeShouldNotHaveAnEmptyLexicalContext,                                    \
+    "we should not have an empty lexical context")                            \
+  V(kWithStatement, "WithStatement")                                          \
+  V(kWrongAddressOrValuePassedToRecordWrite,                                  \
+    "Wrong address or value passed to RecordWrite")
+
+
+#define ERROR_MESSAGES_CONSTANTS(C, T) C,
+enum BailoutReason {
+  ERROR_MESSAGES_LIST(ERROR_MESSAGES_CONSTANTS)
+  kLastErrorMessage
+};
+#undef ERROR_MESSAGES_CONSTANTS
+
+
+const char* GetBailoutReason(BailoutReason reason);
 
 
 // Object is the abstract superclass for all classes in the
 // object hierarchy.
 // Object does not use any virtual functions to avoid the
 // allocation of the C++ vtable.
 // Since Smi and Failure are subclasses of Object no
 // data members can be present in Object.
 class Object : public MaybeObject {
  public:
@@ skipping 4121 matching lines @@
 
   class EnumLengthBits:             public BitField<int,   0, 11> {};
   class NumberOfOwnDescriptorsBits: public BitField<int,  11, 11> {};
   class IsShared:                   public BitField<bool, 22,  1> {};
   class FunctionWithPrototype:      public BitField<bool, 23,  1> {};
   class DictionaryMap:              public BitField<bool, 24,  1> {};
   class OwnsDescriptors:            public BitField<bool, 25,  1> {};
   class IsObserved:                 public BitField<bool, 26,  1> {};
   class Deprecated:                 public BitField<bool, 27,  1> {};
   class IsFrozen:                   public BitField<bool, 28,  1> {};
+  class IsUnstable:                 public BitField<bool, 29,  1> {};
 
   // Tells whether the object in the prototype property will be used
   // for instances created from this function.  If the prototype
   // property is set to a value that is not a JSObject, the prototype
   // property will not be used to create instances of the function.
   // See ECMA-262, 13.2.2.
   inline void set_non_instance_prototype(bool value);
   inline bool has_non_instance_prototype();
 
   // Tells whether function has special prototype property. If not, prototype
@@ skipping 284 matching lines @@
     set_bit_field3(EnumLengthBits::update(bit_field3(), length));
   }
 
   inline bool CanTrackAllocationSite();
   inline bool owns_descriptors();
   inline void set_owns_descriptors(bool is_shared);
   inline bool is_observed();
   inline void set_is_observed(bool is_observed);
   inline void freeze();
   inline bool is_frozen();
+  inline void mark_unstable();
+  inline bool is_stable();
   inline void deprecate();
   inline bool is_deprecated();
   inline bool CanBeDeprecated();
   // Returns a non-deprecated version of the input. If the input was not
   // deprecated, it is directly returned. Otherwise, the non-deprecated version
   // is found by re-transitioning from the root of the transition tree using the
   // descriptor array of the map. Returns NULL if no updated map is found.
   Map* CurrentMapForDeprecated();
 
   MUST_USE_RESULT MaybeObject* RawCopy(int instance_size);
@@ skipping 337 matching lines @@
 
   // [context_data]: context data for the context this script was compiled in.
   DECL_ACCESSORS(context_data, Object)
 
   // [wrapper]: the wrapper cache.
   DECL_ACCESSORS(wrapper, Foreign)
 
   // [type]: the script type.
   DECL_ACCESSORS(type, Smi)
 
-  // [compilation]: how the the script was compiled.
-  DECL_ACCESSORS(compilation_type, Smi)
-
-  // [is_compiled]: determines whether the script has already been compiled.
-  DECL_ACCESSORS(compilation_state, Smi)
-
   // [line_ends]: FixedArray of line ends positions.
   DECL_ACCESSORS(line_ends, Object)
 
   // [eval_from_shared]: for eval scripts the shared funcion info for the
   // function from which eval was called.
   DECL_ACCESSORS(eval_from_shared, Object)
 
   // [eval_from_instructions_offset]: the instruction offset in the code for the
   // function from which eval was called where eval was called.
   DECL_ACCESSORS(eval_from_instructions_offset, Smi)
 
+  // [flags]: Holds an exciting bitfield.
+  DECL_ACCESSORS(flags, Smi)
+
+  // [compilation_type]: how the the script was compiled. Encoded in the
+  // 'flags' field.
+  inline CompilationType compilation_type();
+  inline void set_compilation_type(CompilationType type);
+
+  // [compilation_state]: determines whether the script has already been
+  // compiled. Encoded in the 'flags' field.
+  inline CompilationState compilation_state();
+  inline void set_compilation_state(CompilationState state);
+
+  // [is_shared_cross_origin]: An opaque boolean set by the embedder via
+  // ScriptOrigin, and used by the embedder to make decisions about the
+  // script's level of privilege. V8 just passes this through. Encoded in
+  // the 'flags' field.
+  DECL_BOOLEAN_ACCESSORS(is_shared_cross_origin)
+
   static inline Script* cast(Object* obj);
 
   // If script source is an external string, check that the underlying
   // resource is accessible. Otherwise, always return true.
   inline bool HasValidSource();
 
   // Dispatched behavior.
   DECLARE_PRINTER(Script)
   DECLARE_VERIFIER(Script)
 
   static const int kSourceOffset = HeapObject::kHeaderSize;
   static const int kNameOffset = kSourceOffset + kPointerSize;
   static const int kLineOffsetOffset = kNameOffset + kPointerSize;
   static const int kColumnOffsetOffset = kLineOffsetOffset + kPointerSize;
   static const int kDataOffset = kColumnOffsetOffset + kPointerSize;
   static const int kContextOffset = kDataOffset + kPointerSize;
   static const int kWrapperOffset = kContextOffset + kPointerSize;
   static const int kTypeOffset = kWrapperOffset + kPointerSize;
-  static const int kCompilationTypeOffset = kTypeOffset + kPointerSize;
-  static const int kCompilationStateOffset =
-      kCompilationTypeOffset + kPointerSize;
-  static const int kLineEndsOffset = kCompilationStateOffset + kPointerSize;
+  static const int kLineEndsOffset = kTypeOffset + kPointerSize;
   static const int kIdOffset = kLineEndsOffset + kPointerSize;
   static const int kEvalFromSharedOffset = kIdOffset + kPointerSize;
   static const int kEvalFrominstructionsOffsetOffset =
       kEvalFromSharedOffset + kPointerSize;
-  static const int kSize = kEvalFrominstructionsOffsetOffset + kPointerSize;
+  static const int kFlagsOffset =
+      kEvalFrominstructionsOffsetOffset + kPointerSize;
+  static const int kSize = kFlagsOffset + kPointerSize;
 
  private:
+  // Bit positions in the flags field.
+  static const int kCompilationTypeBit = 0;
+  static const int kCompilationStateBit = 1;
+  static const int kIsSharedCrossOriginBit = 2;
+
   DISALLOW_IMPLICIT_CONSTRUCTORS(Script);
 };
 
 
 // List of builtin functions we want to identify to improve code
 // generation.
 //
 // Each entry has a name of a global object property holding an object
 // optionally followed by ".prototype", a name of a builtin function
 // on the object (the one the id is set for), and a label.
@@ skipping 370 matching lines @@
 
   // Indicates whether or not the code in the shared function support
   // deoptimization.
   inline bool has_deoptimization_support();
 
   // Enable deoptimization support through recompiled code.
   void EnableDeoptimizationSupport(Code* recompiled);
 
   // Disable (further) attempted optimization of all functions sharing this
   // shared function info.
-  void DisableOptimization(const char* reason);
+  void DisableOptimization(BailoutReason reason);
 
   // Lookup the bailout ID and ASSERT that it exists in the non-optimized
   // code, returns whether it asserted (i.e., always true if assertions are
   // disabled).
   bool VerifyBailoutId(BailoutId id);
 
   // [source code]: Source code for the function.
   bool HasSourceCode();
   Handle<Object> GetSourceCode();
 
@@ skipping 3580 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_