616 // by Luc Maranget, Susmit Sarkar and Peter Sewell, INRIA/Cambridge)
617 #ifdef CPU_MULTI_COPY_ATOMIC
618 // Not needed.
619 const bool support_IRIW_for_not_multiple_copy_atomic_cpu = false;
620 #else
621 // From all non-multi-copy-atomic architectures, only PPC64 supports IRIW at the moment.
622 // Final decision is subject to JEP 188: Java Memory Model Update.
623 const bool support_IRIW_for_not_multiple_copy_atomic_cpu = PPC64_ONLY(true) NOT_PPC64(false);
624 #endif
625
626 // The expected size in bytes of a cache line.
627 #ifndef DEFAULT_CACHE_LINE_SIZE
628 #error "Platform should define DEFAULT_CACHE_LINE_SIZE"
629 #endif
630
631 // The default padding size for data structures to avoid false sharing.
632 #ifndef DEFAULT_PADDING_SIZE
633 #error "Platform should define DEFAULT_PADDING_SIZE"
634 #endif
635
636
637 //----------------------------------------------------------------------------------------------------
638 // Miscellaneous
639
640 // 6302670 Eliminate Hotspot __fabsf dependency
641 // All fabs() callers should call this function instead, which will implicitly
642 // convert the operand to double, avoiding a dependency on __fabsf which
643 // doesn't exist in early versions of Solaris 8.
644 inline double fabsd(double value) {
645 return fabs(value);
646 }
647
648 // Returns numerator/denominator as percentage value from 0 to 100. If denominator
649 // is zero, return 0.0.
650 template<typename T>
651 inline double percent_of(T numerator, T denominator) {
652 return denominator != 0 ? (double)numerator / (double)denominator * 100.0 : 0.0;
653 }
654
655 //----------------------------------------------------------------------------------------------------
656 // Special casts
695 enum BasicType : u1 {
696 // The values T_BOOLEAN..T_LONG (4..11) are derived from the JVMS.
697 T_BOOLEAN = JVM_T_BOOLEAN,
698 T_CHAR = JVM_T_CHAR,
699 T_FLOAT = JVM_T_FLOAT,
700 T_DOUBLE = JVM_T_DOUBLE,
701 T_BYTE = JVM_T_BYTE,
702 T_SHORT = JVM_T_SHORT,
703 T_INT = JVM_T_INT,
704 T_LONG = JVM_T_LONG,
705 // The remaining values are not part of any standard.
706 // T_OBJECT and T_VOID denote two more semantic choices
707 // for method return values.
708 // T_OBJECT and T_ARRAY describe signature syntax.
709 // T_ADDRESS, T_METADATA, T_NARROWOOP, T_NARROWKLASS describe
710 // internal references within the JVM as if they were Java
711 // types in their own right.
712 T_OBJECT = 12,
713 T_ARRAY = 13,
714 T_VOID = 14,
715 T_ADDRESS = 15,
716 T_NARROWOOP = 16,
717 T_METADATA = 17,
718 T_NARROWKLASS = 18,
719 T_CONFLICT = 19, // for stack value type with conflicting contents
720 T_ILLEGAL = 99
721 };
722
723 #define SIGNATURE_TYPES_DO(F, N) \
724 F(JVM_SIGNATURE_BOOLEAN, T_BOOLEAN, N) \
725 F(JVM_SIGNATURE_CHAR, T_CHAR, N) \
726 F(JVM_SIGNATURE_FLOAT, T_FLOAT, N) \
727 F(JVM_SIGNATURE_DOUBLE, T_DOUBLE, N) \
728 F(JVM_SIGNATURE_BYTE, T_BYTE, N) \
729 F(JVM_SIGNATURE_SHORT, T_SHORT, N) \
730 F(JVM_SIGNATURE_INT, T_INT, N) \
731 F(JVM_SIGNATURE_LONG, T_LONG, N) \
732 F(JVM_SIGNATURE_CLASS, T_OBJECT, N) \
733 F(JVM_SIGNATURE_ARRAY, T_ARRAY, N) \
734 F(JVM_SIGNATURE_VOID, T_VOID, N) \
735 /*end*/
736
737 inline bool is_java_type(BasicType t) {
738 return T_BOOLEAN <= t && t <= T_VOID;
739 }
743 }
744
745 inline bool is_subword_type(BasicType t) {
746 // these guys are processed exactly like T_INT in calling sequences:
747 return (t == T_BOOLEAN || t == T_CHAR || t == T_BYTE || t == T_SHORT);
748 }
749
750 inline bool is_signed_subword_type(BasicType t) {
751 return (t == T_BYTE || t == T_SHORT);
752 }
753
754 inline bool is_unsigned_subword_type(BasicType t) {
755 return (t == T_BOOLEAN || t == T_CHAR);
756 }
757
758 inline bool is_double_word_type(BasicType t) {
759 return (t == T_DOUBLE || t == T_LONG);
760 }
761
762 inline bool is_reference_type(BasicType t, bool include_narrow_oop = false) {
763 return (t == T_OBJECT || t == T_ARRAY || (include_narrow_oop && t == T_NARROWOOP));
764 }
765
766 inline bool is_integral_type(BasicType t) {
767 return is_subword_type(t) || t == T_INT || t == T_LONG;
768 }
769
770 inline bool is_non_subword_integral_type(BasicType t) {
771 return t == T_INT || t == T_LONG;
772 }
773
774 inline bool is_floating_point_type(BasicType t) {
775 return (t == T_FLOAT || t == T_DOUBLE);
776 }
777
778 extern char type2char_tab[T_CONFLICT+1]; // Map a BasicType to a jchar
779 inline char type2char(BasicType t) { return (uint)t < T_CONFLICT+1 ? type2char_tab[t] : 0; }
780 extern int type2size[T_CONFLICT+1]; // Map BasicType to result stack elements
781 extern const char* type2name_tab[T_CONFLICT+1]; // Map a BasicType to a char*
782 extern BasicType name2type(const char* name);
817
818 // Auxiliary math routines
819 // least common multiple
820 extern size_t lcm(size_t a, size_t b);
821
822
823 // NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/runtime/BasicType.java
824 enum BasicTypeSize {
825 T_BOOLEAN_size = 1,
826 T_CHAR_size = 1,
827 T_FLOAT_size = 1,
828 T_DOUBLE_size = 2,
829 T_BYTE_size = 1,
830 T_SHORT_size = 1,
831 T_INT_size = 1,
832 T_LONG_size = 2,
833 T_OBJECT_size = 1,
834 T_ARRAY_size = 1,
835 T_NARROWOOP_size = 1,
836 T_NARROWKLASS_size = 1,
837 T_VOID_size = 0
838 };
839
840 // this works on valid parameter types but not T_VOID, T_CONFLICT, etc.
841 inline int parameter_type_word_count(BasicType t) {
842 if (is_double_word_type(t)) return 2;
843 assert(is_java_primitive(t) || is_reference_type(t), "no goofy types here please");
844 assert(type2size[t] == 1, "must be");
845 return 1;
846 }
847
848 // maps a BasicType to its instance field storage type:
849 // all sub-word integral types are widened to T_INT
850 extern BasicType type2field[T_CONFLICT+1];
851 extern BasicType type2wfield[T_CONFLICT+1];
852
853
854 // size in bytes
855 enum ArrayElementSize {
856 T_BOOLEAN_aelem_bytes = 1,
857 T_CHAR_aelem_bytes = 2,
858 T_FLOAT_aelem_bytes = 4,
859 T_DOUBLE_aelem_bytes = 8,
860 T_BYTE_aelem_bytes = 1,
861 T_SHORT_aelem_bytes = 2,
862 T_INT_aelem_bytes = 4,
863 T_LONG_aelem_bytes = 8,
864 #ifdef _LP64
865 T_OBJECT_aelem_bytes = 8,
866 T_ARRAY_aelem_bytes = 8,
867 #else
868 T_OBJECT_aelem_bytes = 4,
869 T_ARRAY_aelem_bytes = 4,
870 #endif
871 T_NARROWOOP_aelem_bytes = 4,
872 T_NARROWKLASS_aelem_bytes = 4,
873 T_VOID_aelem_bytes = 0
874 };
875
876 extern int _type2aelembytes[T_CONFLICT+1]; // maps a BasicType to nof bytes used by its array element
877 #ifdef ASSERT
878 extern int type2aelembytes(BasicType t, bool allow_address = false); // asserts
879 #else
880 inline int type2aelembytes(BasicType t, bool allow_address = false) { return _type2aelembytes[t]; }
881 #endif
882
883 inline bool same_type_or_subword_size(BasicType t1, BasicType t2) {
884 return (t1 == t2) || (is_subword_type(t1) && type2aelembytes(t1) == type2aelembytes(t2));
885 }
886
887 // JavaValue serves as a container for arbitrary Java values.
888
889 class JavaValue {
890
891 public:
892 typedef union JavaCallValue {
893 jfloat f;
943
944 // TosState describes the top-of-stack state before and after the execution of
945 // a bytecode or method. The top-of-stack value may be cached in one or more CPU
946 // registers. The TosState corresponds to the 'machine representation' of this cached
947 // value. There's 4 states corresponding to the JAVA types int, long, float & double
948 // as well as a 5th state in case the top-of-stack value is actually on the top
949 // of stack (in memory) and thus not cached. The atos state corresponds to the itos
950 // state when it comes to machine representation but is used separately for (oop)
951 // type specific operations (e.g. verification code).
952
953 enum TosState { // describes the tos cache contents
954 btos = 0, // byte, bool tos cached
955 ztos = 1, // byte, bool tos cached
956 ctos = 2, // char tos cached
957 stos = 3, // short tos cached
958 itos = 4, // int tos cached
959 ltos = 5, // long tos cached
960 ftos = 6, // float tos cached
961 dtos = 7, // double tos cached
962 atos = 8, // object cached
963 vtos = 9, // tos not cached
964 number_of_states,
965 ilgl // illegal state: should not occur
966 };
967
968
969 inline TosState as_TosState(BasicType type) {
970 switch (type) {
971 case T_BYTE : return btos;
972 case T_BOOLEAN: return ztos;
973 case T_CHAR : return ctos;
974 case T_SHORT : return stos;
975 case T_INT : return itos;
976 case T_LONG : return ltos;
977 case T_FLOAT : return ftos;
978 case T_DOUBLE : return dtos;
979 case T_VOID : return vtos;
980 case T_ARRAY : // fall through
981 case T_OBJECT : return atos;
982 default : return ilgl;
983 }
984 }
985
986 inline BasicType as_BasicType(TosState state) {
987 switch (state) {
988 case btos : return T_BYTE;
989 case ztos : return T_BOOLEAN;
990 case ctos : return T_CHAR;
991 case stos : return T_SHORT;
992 case itos : return T_INT;
993 case ltos : return T_LONG;
994 case ftos : return T_FLOAT;
995 case dtos : return T_DOUBLE;
996 case atos : return T_OBJECT;
997 case vtos : return T_VOID;
998 default : return T_ILLEGAL;
999 }
1000 }
1038
1039 //----------------------------------------------------------------------------------------------------
1040 // Special constants for debugging
1041
1042 const jint badInt = -3; // generic "bad int" value
1043 const intptr_t badAddressVal = -2; // generic "bad address" value
1044 const intptr_t badOopVal = -1; // generic "bad oop" value
1045 const intptr_t badHeapOopVal = (intptr_t) CONST64(0x2BAD4B0BBAADBABE); // value used to zap heap after GC
1046 const int badStackSegVal = 0xCA; // value used to zap stack segments
1047 const int badHandleValue = 0xBC; // value used to zap vm handle area
1048 const int badResourceValue = 0xAB; // value used to zap resource area
1049 const int freeBlockPad = 0xBA; // value used to pad freed blocks.
1050 const int uninitBlockPad = 0xF1; // value used to zap newly malloc'd blocks.
1051 const juint uninitMetaWordVal = 0xf7f7f7f7; // value used to zap newly allocated metachunk
1052 const jubyte heapPaddingByteVal = 0xBD; // value used to zap object padding in the heap
1053 const juint badHeapWordVal = 0xBAADBABE; // value used to zap heap after GC
1054 const int badCodeHeapNewVal = 0xCC; // value used to zap Code heap at allocation
1055 const int badCodeHeapFreeVal = 0xDD; // value used to zap Code heap at deallocation
1056 const intptr_t badDispHeaderDeopt = 0xDE0BD000; // value to fill unused displaced header during deoptimization
1057 const intptr_t badDispHeaderOSR = 0xDEAD05A0; // value to fill unused displaced header during OSR
1058
1059 // (These must be implemented as #defines because C++ compilers are
1060 // not obligated to inline non-integral constants!)
1061 #define badAddress ((address)::badAddressVal)
1062 #define badHeapWord (::badHeapWordVal)
1063
1064 // Default TaskQueue size is 16K (32-bit) or 128K (64-bit)
1065 const uint TASKQUEUE_SIZE = (NOT_LP64(1<<14) LP64_ONLY(1<<17));
1066
1067 //----------------------------------------------------------------------------------------------------
1068 // Utility functions for bitfield manipulations
1069
1070 const intptr_t AllBits = ~0; // all bits set in a word
1071 const intptr_t NoBits = 0; // no bits set in a word
1072 const jlong NoLongBits = 0; // no bits set in a long
1073 const intptr_t OneBit = 1; // only right_most bit set in a word
1074
1075 // Return a value of type T with the n.th bit set and all other bits zero.
1076 // T must be an integral or enum type. n must be non-negative. If n is at
1077 // least the bitwise size of T then all bits in the result are zero.
|
616 // by Luc Maranget, Susmit Sarkar and Peter Sewell, INRIA/Cambridge)
617 #ifdef CPU_MULTI_COPY_ATOMIC
618 // Not needed.
619 const bool support_IRIW_for_not_multiple_copy_atomic_cpu = false;
620 #else
621 // From all non-multi-copy-atomic architectures, only PPC64 supports IRIW at the moment.
622 // Final decision is subject to JEP 188: Java Memory Model Update.
623 const bool support_IRIW_for_not_multiple_copy_atomic_cpu = PPC64_ONLY(true) NOT_PPC64(false);
624 #endif
625
626 // The expected size in bytes of a cache line.
627 #ifndef DEFAULT_CACHE_LINE_SIZE
628 #error "Platform should define DEFAULT_CACHE_LINE_SIZE"
629 #endif
630
631 // The default padding size for data structures to avoid false sharing.
632 #ifndef DEFAULT_PADDING_SIZE
633 #error "Platform should define DEFAULT_PADDING_SIZE"
634 #endif
635
636 //----------------------------------------------------------------------------------------------------
637 // Miscellaneous
638
639 // 6302670 Eliminate Hotspot __fabsf dependency
640 // All fabs() callers should call this function instead, which will implicitly
641 // convert the operand to double, avoiding a dependency on __fabsf which
642 // doesn't exist in early versions of Solaris 8.
643 inline double fabsd(double value) {
644 return fabs(value);
645 }
646
647 // Returns numerator/denominator as percentage value from 0 to 100. If denominator
648 // is zero, return 0.0.
649 template<typename T>
650 inline double percent_of(T numerator, T denominator) {
651 return denominator != 0 ? (double)numerator / (double)denominator * 100.0 : 0.0;
652 }
653
654 //----------------------------------------------------------------------------------------------------
655 // Special casts
694 enum BasicType : u1 {
695 // The values T_BOOLEAN..T_LONG (4..11) are derived from the JVMS.
696 T_BOOLEAN = JVM_T_BOOLEAN,
697 T_CHAR = JVM_T_CHAR,
698 T_FLOAT = JVM_T_FLOAT,
699 T_DOUBLE = JVM_T_DOUBLE,
700 T_BYTE = JVM_T_BYTE,
701 T_SHORT = JVM_T_SHORT,
702 T_INT = JVM_T_INT,
703 T_LONG = JVM_T_LONG,
704 // The remaining values are not part of any standard.
705 // T_OBJECT and T_VOID denote two more semantic choices
706 // for method return values.
707 // T_OBJECT and T_ARRAY describe signature syntax.
708 // T_ADDRESS, T_METADATA, T_NARROWOOP, T_NARROWKLASS describe
709 // internal references within the JVM as if they were Java
710 // types in their own right.
711 T_OBJECT = 12,
712 T_ARRAY = 13,
713 T_VOID = 14,
714 T_FLAT_ELEMENT = 15, // Not a true BasicType, only used in layout helpers of flat arrays
715 T_ADDRESS = 16,
716 T_NARROWOOP = 17,
717 T_METADATA = 18,
718 T_NARROWKLASS = 19,
719 T_CONFLICT = 20, // for stack value type with conflicting contents
720 T_ILLEGAL = 99
721 };
722
723 #define SIGNATURE_TYPES_DO(F, N) \
724 F(JVM_SIGNATURE_BOOLEAN, T_BOOLEAN, N) \
725 F(JVM_SIGNATURE_CHAR, T_CHAR, N) \
726 F(JVM_SIGNATURE_FLOAT, T_FLOAT, N) \
727 F(JVM_SIGNATURE_DOUBLE, T_DOUBLE, N) \
728 F(JVM_SIGNATURE_BYTE, T_BYTE, N) \
729 F(JVM_SIGNATURE_SHORT, T_SHORT, N) \
730 F(JVM_SIGNATURE_INT, T_INT, N) \
731 F(JVM_SIGNATURE_LONG, T_LONG, N) \
732 F(JVM_SIGNATURE_CLASS, T_OBJECT, N) \
733 F(JVM_SIGNATURE_ARRAY, T_ARRAY, N) \
734 F(JVM_SIGNATURE_VOID, T_VOID, N) \
735 /*end*/
736
737 inline bool is_java_type(BasicType t) {
738 return T_BOOLEAN <= t && t <= T_VOID;
739 }
743 }
744
745 inline bool is_subword_type(BasicType t) {
746 // these guys are processed exactly like T_INT in calling sequences:
747 return (t == T_BOOLEAN || t == T_CHAR || t == T_BYTE || t == T_SHORT);
748 }
749
750 inline bool is_signed_subword_type(BasicType t) {
751 return (t == T_BYTE || t == T_SHORT);
752 }
753
754 inline bool is_unsigned_subword_type(BasicType t) {
755 return (t == T_BOOLEAN || t == T_CHAR);
756 }
757
758 inline bool is_double_word_type(BasicType t) {
759 return (t == T_DOUBLE || t == T_LONG);
760 }
761
762 inline bool is_reference_type(BasicType t, bool include_narrow_oop = false) {
763 assert(t != T_FLAT_ELEMENT, ""); // Strong assert to detect misuses of T_FLAT_ELEMENT
764 return (t == T_OBJECT || t == T_ARRAY || (include_narrow_oop && t == T_NARROWOOP));
765 }
766
767 inline bool is_integral_type(BasicType t) {
768 return is_subword_type(t) || t == T_INT || t == T_LONG;
769 }
770
771 inline bool is_non_subword_integral_type(BasicType t) {
772 return t == T_INT || t == T_LONG;
773 }
774
775 inline bool is_floating_point_type(BasicType t) {
776 return (t == T_FLOAT || t == T_DOUBLE);
777 }
778
779 extern char type2char_tab[T_CONFLICT+1]; // Map a BasicType to a jchar
780 inline char type2char(BasicType t) { return (uint)t < T_CONFLICT+1 ? type2char_tab[t] : 0; }
781 extern int type2size[T_CONFLICT+1]; // Map BasicType to result stack elements
782 extern const char* type2name_tab[T_CONFLICT+1]; // Map a BasicType to a char*
783 extern BasicType name2type(const char* name);
818
819 // Auxiliary math routines
820 // least common multiple
821 extern size_t lcm(size_t a, size_t b);
822
823
824 // NOTE: replicated in SA in vm/agent/sun/jvm/hotspot/runtime/BasicType.java
825 enum BasicTypeSize {
826 T_BOOLEAN_size = 1,
827 T_CHAR_size = 1,
828 T_FLOAT_size = 1,
829 T_DOUBLE_size = 2,
830 T_BYTE_size = 1,
831 T_SHORT_size = 1,
832 T_INT_size = 1,
833 T_LONG_size = 2,
834 T_OBJECT_size = 1,
835 T_ARRAY_size = 1,
836 T_NARROWOOP_size = 1,
837 T_NARROWKLASS_size = 1,
838 T_VOID_size = 0,
839 T_FLAT_ELEMENT_size = 0
840 };
841
842 // this works on valid parameter types but not T_VOID, T_CONFLICT, etc.
843 inline int parameter_type_word_count(BasicType t) {
844 if (is_double_word_type(t)) return 2;
845 assert(is_java_primitive(t) || is_reference_type(t), "no goofy types here please");
846 assert(type2size[t] == 1, "must be");
847 return 1;
848 }
849
850 // maps a BasicType to its instance field storage type:
851 // all sub-word integral types are widened to T_INT
852 extern BasicType type2field[T_CONFLICT+1];
853 extern BasicType type2wfield[T_CONFLICT+1];
854
855
856 // size in bytes
857 enum ArrayElementSize {
858 T_BOOLEAN_aelem_bytes = 1,
859 T_CHAR_aelem_bytes = 2,
860 T_FLOAT_aelem_bytes = 4,
861 T_DOUBLE_aelem_bytes = 8,
862 T_BYTE_aelem_bytes = 1,
863 T_SHORT_aelem_bytes = 2,
864 T_INT_aelem_bytes = 4,
865 T_LONG_aelem_bytes = 8,
866 #ifdef _LP64
867 T_OBJECT_aelem_bytes = 8,
868 T_ARRAY_aelem_bytes = 8,
869 #else
870 T_OBJECT_aelem_bytes = 4,
871 T_ARRAY_aelem_bytes = 4,
872 #endif
873 T_NARROWOOP_aelem_bytes = 4,
874 T_NARROWKLASS_aelem_bytes = 4,
875 T_VOID_aelem_bytes = 0,
876 T_FLAT_ELEMENT_aelem_bytes = 0
877 };
878
879 extern int _type2aelembytes[T_CONFLICT+1]; // maps a BasicType to nof bytes used by its array element
880 #ifdef ASSERT
881 extern int type2aelembytes(BasicType t, bool allow_address = false); // asserts
882 #else
883 inline int type2aelembytes(BasicType t, bool allow_address = false) { return _type2aelembytes[t]; }
884 #endif
885
886 inline bool same_type_or_subword_size(BasicType t1, BasicType t2) {
887 return (t1 == t2) || (is_subword_type(t1) && type2aelembytes(t1) == type2aelembytes(t2));
888 }
889
890 // JavaValue serves as a container for arbitrary Java values.
891
892 class JavaValue {
893
894 public:
895 typedef union JavaCallValue {
896 jfloat f;
946
947 // TosState describes the top-of-stack state before and after the execution of
948 // a bytecode or method. The top-of-stack value may be cached in one or more CPU
949 // registers. The TosState corresponds to the 'machine representation' of this cached
950 // value. There's 4 states corresponding to the JAVA types int, long, float & double
951 // as well as a 5th state in case the top-of-stack value is actually on the top
952 // of stack (in memory) and thus not cached. The atos state corresponds to the itos
953 // state when it comes to machine representation but is used separately for (oop)
954 // type specific operations (e.g. verification code).
955
956 enum TosState { // describes the tos cache contents
957 btos = 0, // byte, bool tos cached
958 ztos = 1, // byte, bool tos cached
959 ctos = 2, // char tos cached
960 stos = 3, // short tos cached
961 itos = 4, // int tos cached
962 ltos = 5, // long tos cached
963 ftos = 6, // float tos cached
964 dtos = 7, // double tos cached
965 atos = 8, // object cached
966 vtos = 9, // tos not cached,
967 number_of_states,
968 ilgl // illegal state: should not occur
969 };
970
971
972 inline TosState as_TosState(BasicType type) {
973 switch (type) {
974 case T_BYTE : return btos;
975 case T_BOOLEAN: return ztos;
976 case T_CHAR : return ctos;
977 case T_SHORT : return stos;
978 case T_INT : return itos;
979 case T_LONG : return ltos;
980 case T_FLOAT : return ftos;
981 case T_DOUBLE : return dtos;
982 case T_VOID : return vtos;
983 case T_ARRAY : // fall through
984 case T_OBJECT : return atos;
985 default : return ilgl;
986 }
987 }
988
989 inline BasicType as_BasicType(TosState state) {
990 switch (state) {
991 case btos : return T_BYTE;
992 case ztos : return T_BOOLEAN;
993 case ctos : return T_CHAR;
994 case stos : return T_SHORT;
995 case itos : return T_INT;
996 case ltos : return T_LONG;
997 case ftos : return T_FLOAT;
998 case dtos : return T_DOUBLE;
999 case atos : return T_OBJECT;
1000 case vtos : return T_VOID;
1001 default : return T_ILLEGAL;
1002 }
1003 }
1041
1042 //----------------------------------------------------------------------------------------------------
1043 // Special constants for debugging
1044
1045 const jint badInt = -3; // generic "bad int" value
1046 const intptr_t badAddressVal = -2; // generic "bad address" value
1047 const intptr_t badOopVal = -1; // generic "bad oop" value
1048 const intptr_t badHeapOopVal = (intptr_t) CONST64(0x2BAD4B0BBAADBABE); // value used to zap heap after GC
1049 const int badStackSegVal = 0xCA; // value used to zap stack segments
1050 const int badHandleValue = 0xBC; // value used to zap vm handle area
1051 const int badResourceValue = 0xAB; // value used to zap resource area
1052 const int freeBlockPad = 0xBA; // value used to pad freed blocks.
1053 const int uninitBlockPad = 0xF1; // value used to zap newly malloc'd blocks.
1054 const juint uninitMetaWordVal = 0xf7f7f7f7; // value used to zap newly allocated metachunk
1055 const jubyte heapPaddingByteVal = 0xBD; // value used to zap object padding in the heap
1056 const juint badHeapWordVal = 0xBAADBABE; // value used to zap heap after GC
1057 const int badCodeHeapNewVal = 0xCC; // value used to zap Code heap at allocation
1058 const int badCodeHeapFreeVal = 0xDD; // value used to zap Code heap at deallocation
1059 const intptr_t badDispHeaderDeopt = 0xDE0BD000; // value to fill unused displaced header during deoptimization
1060 const intptr_t badDispHeaderOSR = 0xDEAD05A0; // value to fill unused displaced header during OSR
1061 const juint badRegWordVal = 0xDEADDA7A; // value used to zap registers
1062
1063 // (These must be implemented as #defines because C++ compilers are
1064 // not obligated to inline non-integral constants!)
1065 #define badAddress ((address)::badAddressVal)
1066 #define badHeapWord (::badHeapWordVal)
1067
1068 // Default TaskQueue size is 16K (32-bit) or 128K (64-bit)
1069 const uint TASKQUEUE_SIZE = (NOT_LP64(1<<14) LP64_ONLY(1<<17));
1070
1071 //----------------------------------------------------------------------------------------------------
1072 // Utility functions for bitfield manipulations
1073
1074 const intptr_t AllBits = ~0; // all bits set in a word
1075 const intptr_t NoBits = 0; // no bits set in a word
1076 const jlong NoLongBits = 0; // no bits set in a long
1077 const intptr_t OneBit = 1; // only right_most bit set in a word
1078
1079 // Return a value of type T with the n.th bit set and all other bits zero.
1080 // T must be an integral or enum type. n must be non-negative. If n is at
1081 // least the bitwise size of T then all bits in the result are zero.
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