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1 // Copyright 2011 the V8 project authors. All rights reserved. | 1 // Copyright 2011 the V8 project authors. All rights reserved. |
2 // Redistribution and use in source and binary forms, with or without | 2 // Redistribution and use in source and binary forms, with or without |
3 // modification, are permitted provided that the following conditions are | 3 // modification, are permitted provided that the following conditions are |
4 // met: | 4 // met: |
5 // | 5 // |
6 // * Redistributions of source code must retain the above copyright | 6 // * Redistributions of source code must retain the above copyright |
7 // notice, this list of conditions and the following disclaimer. | 7 // notice, this list of conditions and the following disclaimer. |
8 // * Redistributions in binary form must reproduce the above | 8 // * Redistributions in binary form must reproduce the above |
9 // copyright notice, this list of conditions and the following | 9 // copyright notice, this list of conditions and the following |
10 // disclaimer in the documentation and/or other materials provided | 10 // disclaimer in the documentation and/or other materials provided |
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898 }; | 898 }; |
899 | 899 |
900 | 900 |
901 class ToBooleanStub: public CodeStub { | 901 class ToBooleanStub: public CodeStub { |
902 public: | 902 public: |
903 enum Type { | 903 enum Type { |
904 UNDEFINED, | 904 UNDEFINED, |
905 BOOLEAN, | 905 BOOLEAN, |
906 NULL_TYPE, | 906 NULL_TYPE, |
907 SMI, | 907 SMI, |
908 UNDETECTABLE, | |
909 SPEC_OBJECT, | 908 SPEC_OBJECT, |
910 STRING, | 909 STRING, |
911 HEAP_NUMBER, | 910 HEAP_NUMBER, |
912 INTERNAL_OBJECT, | 911 INTERNAL_OBJECT, |
913 NUMBER_OF_TYPES | 912 NUMBER_OF_TYPES |
914 }; | 913 }; |
915 | 914 |
| 915 // At most 8 different types can be distinguished, because the Code object |
| 916 // only has room for a single byte to hold a set of these types. :-P |
| 917 STATIC_ASSERT(NUMBER_OF_TYPES <= 8); |
| 918 |
916 class Types { | 919 class Types { |
917 public: | 920 public: |
918 Types() {} | 921 Types() {} |
919 explicit Types(int bits) : set_(bits) {} | 922 explicit Types(byte bits) : set_(bits) {} |
920 | 923 |
921 bool IsEmpty() const { return set_.IsEmpty(); } | 924 bool IsEmpty() const { return set_.IsEmpty(); } |
922 bool Contains(Type type) const { return set_.Contains(type); } | 925 bool Contains(Type type) const { return set_.Contains(type); } |
923 void Add(Type type) { set_.Add(type); } | 926 void Add(Type type) { set_.Add(type); } |
924 int ToInt() const { return set_.ToIntegral(); } | 927 byte ToByte() const { return set_.ToIntegral(); } |
925 void Print(StringStream* stream); | 928 void Print(StringStream* stream); |
926 void TraceTransition(Types to); | 929 void TraceTransition(Types to); |
927 bool Record(Handle<Object> object); | 930 bool Record(Handle<Object> object); |
928 | 931 |
929 private: | 932 private: |
930 EnumSet<Type> set_; | 933 EnumSet<Type, byte> set_; |
931 }; | 934 }; |
932 | 935 |
933 explicit ToBooleanStub(Register tos, Types types = Types()) | 936 explicit ToBooleanStub(Register tos, Types types = Types()) |
934 : tos_(tos), types_(types) { } | 937 : tos_(tos), types_(types) { } |
935 | 938 |
936 void Generate(MacroAssembler* masm); | 939 void Generate(MacroAssembler* masm); |
937 virtual int GetCodeKind() { return Code::TO_BOOLEAN_IC; } | 940 virtual int GetCodeKind() { return Code::TO_BOOLEAN_IC; } |
938 virtual void PrintName(StringStream* stream); | 941 virtual void PrintName(StringStream* stream); |
939 | 942 |
940 private: | 943 private: |
941 Major MajorKey() { return ToBoolean; } | 944 Major MajorKey() { return ToBoolean; } |
942 int MinorKey() { return (tos_.code() << NUMBER_OF_TYPES) | types_.ToInt(); } | 945 int MinorKey() { return (tos_.code() << NUMBER_OF_TYPES) | types_.ToByte(); } |
| 946 |
| 947 virtual void FinishCode(Code* code) { |
| 948 code->set_to_boolean_state(types_.ToByte()); |
| 949 } |
943 | 950 |
944 void CheckOddball(MacroAssembler* masm, | 951 void CheckOddball(MacroAssembler* masm, |
945 Type type, | 952 Type type, |
946 Handle<Object> value, | 953 Handle<Object> value, |
947 bool result, | 954 bool result, |
948 Label* patch); | 955 Label* patch); |
949 void GenerateTypeTransition(MacroAssembler* masm); | 956 void GenerateTypeTransition(MacroAssembler* masm); |
950 | 957 |
951 Register tos_; | 958 Register tos_; |
952 Types types_; | 959 Types types_; |
953 }; | 960 }; |
954 | 961 |
955 } } // namespace v8::internal | 962 } } // namespace v8::internal |
956 | 963 |
957 #endif // V8_CODE_STUBS_H_ | 964 #endif // V8_CODE_STUBS_H_ |
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