Mercurial > jdk8-mips64-public > hotspot / file comparison

comparison: src/share/vm/ci/ciObject.hpp

src/share/vm/ci/ciObject.hpp

changeset 1424
148e5441d916
parent 435
a61af66fc99e
child 1572
97125851f396
equal deleted inserted replaced
1422:00977607da34 1424:148e5441d916
49 // handle may, in a small set of cases, correctly be NULL. 49 // handle may, in a small set of cases, correctly be NULL.
50 jobject _handle; 50 jobject _handle;
51 ciKlass* _klass; 51 ciKlass* _klass;
52 uint _ident; 52 uint _ident;
53 53
54 enum { FLAG_BITS = 1}; 54 enum { FLAG_BITS = 2 };
55 enum { 55 enum {
56 PERM_FLAG = 1 56 PERM_FLAG = 1,
57 SCAVENGABLE_FLAG = 2
57 }; 58 };
58 protected: 59 protected:
59 ciObject(); 60 ciObject();
60 ciObject(oop o); 61 ciObject(oop o);
61 ciObject(Handle h); 62 ciObject(Handle h);
66 oop get_oop() const { 67 oop get_oop() const {
67 assert(_handle != NULL, "null oop"); 68 assert(_handle != NULL, "null oop");
68 return JNIHandles::resolve_non_null(_handle); 69 return JNIHandles::resolve_non_null(_handle);
69 } 70 }
70 71
71 void set_perm() { 72 void init_flags_from(oop x) {
72 _ident |= PERM_FLAG; 73 int flags = 0;
74 if (x != NULL) {
75 if (x->is_perm())
76 flags |= PERM_FLAG;
77 if (x->is_scavengable())
78 flags |= SCAVENGABLE_FLAG;
79 }
80 _ident |= flags;
73 } 81 }
74 82
75 // Virtual behavior of the print() method. 83 // Virtual behavior of the print() method.
76 virtual void print_impl(outputStream* st) {} 84 virtual void print_impl(outputStream* st) {}
77 85
89 bool equals(ciObject* obj); 97 bool equals(ciObject* obj);
90 98
91 // A hash value for the convenience of compilers. 99 // A hash value for the convenience of compilers.
92 int hash(); 100 int hash();
93 101
94 // Tells if this oop has an encoding. (I.e., is it null or perm?) 102 // Tells if this oop has an encoding as a constant.
103 // True if is_scavengable is false.
104 // Also true if ScavengeRootsInCode is non-zero.
95 // If it does not have an encoding, the compiler is responsible for 105 // If it does not have an encoding, the compiler is responsible for
96 // making other arrangements for dealing with the oop. 106 // making other arrangements for dealing with the oop.
97 // See ciEnv::make_perm_array 107 // See ciEnv::make_array
98 bool has_encoding(); 108 bool can_be_constant();
109
110 // Tells if this oop should be made a constant.
111 // True if is_scavengable is false or ScavengeRootsInCode > 1.
112 bool should_be_constant();
99 113
100 // Is this object guaranteed to be in the permanent part of the heap? 114 // Is this object guaranteed to be in the permanent part of the heap?
101 // If so, CollectedHeap::can_elide_permanent_oop_store_barriers is relevant. 115 // If so, CollectedHeap::can_elide_permanent_oop_store_barriers is relevant.
102 // If the answer is false, no guarantees are made. 116 // If the answer is false, no guarantees are made.
103 bool is_perm() { return (_ident & PERM_FLAG) != 0; } 117 bool is_perm() { return (_ident & PERM_FLAG) != 0; }
118
119 // Might this object possibly move during a scavenge operation?
120 // If the answer is true and ScavengeRootsInCode==0, the oop cannot be embedded in code.
121 bool is_scavengable() { return (_ident & SCAVENGABLE_FLAG) != 0; }
104 122
105 // The address which the compiler should embed into the 123 // The address which the compiler should embed into the
106 // generated code to represent this oop. This address 124 // generated code to represent this oop. This address
107 // is not the true address of the oop -- it will get patched 125 // is not the true address of the oop -- it will get patched
108 // during nmethod creation. 126 // during nmethod creation.
109 // 127 //
110 // Usage note: no address arithmetic allowed. Oop must 128 // Usage note: no address arithmetic allowed. Oop must
111 // be registered with the oopRecorder. 129 // be registered with the oopRecorder.
112 jobject encoding(); 130 jobject constant_encoding();
113 131
114 // What kind of ciObject is this? 132 // What kind of ciObject is this?
115 virtual bool is_null_object() const { return false; } 133 virtual bool is_null_object() const { return false; }
116 virtual bool is_instance() { return false; } 134 virtual bool is_instance() { return false; }
117 virtual bool is_method() { return false; } 135 virtual bool is_method() { return false; }

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