32 #include "ci/ciUtilities.hpp"
33
34 // ciField
35 //
36 // This class represents the result of a field lookup in the VM.
37 // The lookup may not succeed, in which case the information in
38 // the ciField will be incomplete.
39 class ciField : public ResourceObj {
40 CI_PACKAGE_ACCESS
41 friend class ciEnv;
42 friend class ciInstanceKlass;
43
44 private:
45 ciFlags _flags;
46 ciInstanceKlass* _holder;
47 ciSymbol* _name;
48 ciSymbol* _signature;
49 ciType* _type;
50 int _offset;
51 bool _is_constant;
52 ciMethod* _known_to_link_with_put;
53 ciInstanceKlass* _known_to_link_with_get;
54 ciConstant _constant_value;
55
56 ciType* compute_type();
57 ciType* compute_type_impl();
58
59 ciField(ciInstanceKlass* klass, int index);
60 ciField(fieldDescriptor* fd);
61
62 // shared constructor code
63 void initialize_from(fieldDescriptor* fd);
64
65 public:
66 ciFlags flags() const { return _flags; }
67
68 // Of which klass is this field a member?
69 //
70 // Usage note: the declared holder of a field is the class
71 // referenced by name in the bytecodes. The canonical holder
72 // is the most general class which holds the field. This
73 // method returns the canonical holder. The declared holder
74 // can be accessed via a method in ciBytecodeStream.
75 //
76 // Ex.
77 // class A {
78 // public int f = 7;
79 // }
80 // class B extends A {
85 //
86 // A java compiler is permitted to compile the access to
87 // field f as:
88 //
89 // getfield B.f
90 //
91 // In that case the declared holder of f would be B and
92 // the canonical holder of f would be A.
93 ciInstanceKlass* holder() const { return _holder; }
94
95 // Name of this field?
96 ciSymbol* name() const { return _name; }
97
98 // Signature of this field?
99 ciSymbol* signature() const { return _signature; }
100
101 // Of what type is this field?
102 ciType* type() { return (_type == NULL) ? compute_type() : _type; }
103
104 // How is this field actually stored in memory?
105 BasicType layout_type() { return type2field[(_type == NULL) ? T_OBJECT : _type->basic_type()]; }
106
107 // How big is this field in memory?
108 int size_in_bytes() { return type2aelembytes(layout_type()); }
109
110 // What is the offset of this field?
111 int offset() const {
112 assert(_offset >= 1, "illegal call to offset()");
113 return _offset;
114 }
115
116 // Same question, explicit units. (Fields are aligned to the byte level.)
117 int offset_in_bytes() const {
118 return offset();
119 }
120
121 // Is this field shared?
122 bool is_shared() {
123 // non-static fields of shared holders are cached
124 return _holder->is_shared() && !is_static();
125 }
157 // Check for link time errors. Accessing a field from a
158 // certain method via a certain bytecode may or may not be legal.
159 // This call checks to see if an exception may be raised by
160 // an access of this field.
161 //
162 // Usage note: if the same field is accessed multiple times
163 // in the same compilation, will_link will need to be checked
164 // at each point of access.
165 bool will_link(ciMethod* accessing_method,
166 Bytecodes::Code bc);
167
168 // Java access flags
169 bool is_public () const { return flags().is_public(); }
170 bool is_private () const { return flags().is_private(); }
171 bool is_protected () const { return flags().is_protected(); }
172 bool is_static () const { return flags().is_static(); }
173 bool is_final () const { return flags().is_final(); }
174 bool is_stable () const { return flags().is_stable(); }
175 bool is_volatile () const { return flags().is_volatile(); }
176 bool is_transient () const { return flags().is_transient(); }
177 // The field is modified outside of instance initializer methods
178 // (or class/initializer methods if the field is static).
179 bool has_initialized_final_update() const { return flags().has_initialized_final_update(); }
180
181 bool is_call_site_target() {
182 ciInstanceKlass* callsite_klass = CURRENT_ENV->CallSite_klass();
183 if (callsite_klass == NULL)
184 return false;
185 return (holder()->is_subclass_of(callsite_klass) && (name() == ciSymbol::target_name()));
186 }
187
188 bool is_autobox_cache() {
189 ciSymbol* klass_name = holder()->name();
190 return (name() == ciSymbol::cache_field_name() &&
191 holder()->uses_default_loader() &&
192 (klass_name == ciSymbol::java_lang_Character_CharacterCache() ||
193 klass_name == ciSymbol::java_lang_Byte_ByteCache() ||
194 klass_name == ciSymbol::java_lang_Short_ShortCache() ||
195 klass_name == ciSymbol::java_lang_Integer_IntegerCache() ||
196 klass_name == ciSymbol::java_lang_Long_LongCache()));
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32 #include "ci/ciUtilities.hpp"
33
34 // ciField
35 //
36 // This class represents the result of a field lookup in the VM.
37 // The lookup may not succeed, in which case the information in
38 // the ciField will be incomplete.
39 class ciField : public ResourceObj {
40 CI_PACKAGE_ACCESS
41 friend class ciEnv;
42 friend class ciInstanceKlass;
43
44 private:
45 ciFlags _flags;
46 ciInstanceKlass* _holder;
47 ciSymbol* _name;
48 ciSymbol* _signature;
49 ciType* _type;
50 int _offset;
51 bool _is_constant;
52 bool _is_flattened;
53 bool _is_flattenable;
54 ciMethod* _known_to_link_with_put;
55 ciInstanceKlass* _known_to_link_with_get;
56 ciConstant _constant_value;
57
58 ciType* compute_type();
59 ciType* compute_type_impl();
60
61 ciField(ciInstanceKlass* klass, int index);
62 ciField(fieldDescriptor* fd);
63 ciField(ciField* field, ciInstanceKlass* holder, int offset, bool is_final);
64
65 // shared constructor code
66 void initialize_from(fieldDescriptor* fd);
67
68 public:
69 ciFlags flags() const { return _flags; }
70
71 // Of which klass is this field a member?
72 //
73 // Usage note: the declared holder of a field is the class
74 // referenced by name in the bytecodes. The canonical holder
75 // is the most general class which holds the field. This
76 // method returns the canonical holder. The declared holder
77 // can be accessed via a method in ciBytecodeStream.
78 //
79 // Ex.
80 // class A {
81 // public int f = 7;
82 // }
83 // class B extends A {
88 //
89 // A java compiler is permitted to compile the access to
90 // field f as:
91 //
92 // getfield B.f
93 //
94 // In that case the declared holder of f would be B and
95 // the canonical holder of f would be A.
96 ciInstanceKlass* holder() const { return _holder; }
97
98 // Name of this field?
99 ciSymbol* name() const { return _name; }
100
101 // Signature of this field?
102 ciSymbol* signature() const { return _signature; }
103
104 // Of what type is this field?
105 ciType* type() { return (_type == NULL) ? compute_type() : _type; }
106
107 // How is this field actually stored in memory?
108 BasicType layout_type() { return type2field[type()->basic_type()]; }
109
110 // How big is this field in memory?
111 int size_in_bytes() { return type2aelembytes(layout_type()); }
112
113 // What is the offset of this field?
114 int offset() const {
115 assert(_offset >= 1, "illegal call to offset()");
116 return _offset;
117 }
118
119 // Same question, explicit units. (Fields are aligned to the byte level.)
120 int offset_in_bytes() const {
121 return offset();
122 }
123
124 // Is this field shared?
125 bool is_shared() {
126 // non-static fields of shared holders are cached
127 return _holder->is_shared() && !is_static();
128 }
160 // Check for link time errors. Accessing a field from a
161 // certain method via a certain bytecode may or may not be legal.
162 // This call checks to see if an exception may be raised by
163 // an access of this field.
164 //
165 // Usage note: if the same field is accessed multiple times
166 // in the same compilation, will_link will need to be checked
167 // at each point of access.
168 bool will_link(ciMethod* accessing_method,
169 Bytecodes::Code bc);
170
171 // Java access flags
172 bool is_public () const { return flags().is_public(); }
173 bool is_private () const { return flags().is_private(); }
174 bool is_protected () const { return flags().is_protected(); }
175 bool is_static () const { return flags().is_static(); }
176 bool is_final () const { return flags().is_final(); }
177 bool is_stable () const { return flags().is_stable(); }
178 bool is_volatile () const { return flags().is_volatile(); }
179 bool is_transient () const { return flags().is_transient(); }
180 bool is_flattened () const { return _is_flattened; }
181 bool is_flattenable () const { return _is_flattenable; }
182
183 // The field is modified outside of instance initializer methods
184 // (or class/initializer methods if the field is static).
185 bool has_initialized_final_update() const { return flags().has_initialized_final_update(); }
186
187 bool is_call_site_target() {
188 ciInstanceKlass* callsite_klass = CURRENT_ENV->CallSite_klass();
189 if (callsite_klass == NULL)
190 return false;
191 return (holder()->is_subclass_of(callsite_klass) && (name() == ciSymbol::target_name()));
192 }
193
194 bool is_autobox_cache() {
195 ciSymbol* klass_name = holder()->name();
196 return (name() == ciSymbol::cache_field_name() &&
197 holder()->uses_default_loader() &&
198 (klass_name == ciSymbol::java_lang_Character_CharacterCache() ||
199 klass_name == ciSymbol::java_lang_Byte_ByteCache() ||
200 klass_name == ciSymbol::java_lang_Short_ShortCache() ||
201 klass_name == ciSymbol::java_lang_Integer_IntegerCache() ||
202 klass_name == ciSymbol::java_lang_Long_LongCache()));
|