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() {
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() {
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 }
126
127 // Is this field a constant?
128 //
129 // Clarification: A field is considered constant if:
130 // 1. The field is both static and final
131 // 2. The canonical holder of the field has undergone
132 // static initialization.
133 // 3. If the field is an object or array, then the oop
134 // in question is allocated in perm space.
135 // 4. The field is not one of the special static/final
136 // non-constant fields. These are java.lang.System.in
137 // and java.lang.System.out. Abomination.
138 //
139 // A field is also considered constant if it is marked @Stable
140 // and is non-null (or non-zero, if a primitive).
141 // For non-static fields, the null/zero check must be
142 // arranged by the user, as constant_value().is_null_or_zero().
143 bool is_constant() { return _is_constant; }
144
145 // Get the constant value of this field.
146 ciConstant constant_value() {
147 assert(is_static() && is_constant(), "illegal call to constant_value()");
148 return _constant_value;
149 }
150
151 // Get the constant value of non-static final field in the given
152 // object.
153 ciConstant constant_value_of(ciObject* object) {
154 assert(!is_static() && is_constant(), "only if field is non-static constant");
155 assert(object->is_instance(), "must be instance");
156 return object->as_instance()->field_value(this);
157 }
158
159 // Check for link time errors. Accessing a field from a
160 // certain class via a certain bytecode may or may not be legal.
161 // This call checks to see if an exception may be raised by
162 // an access of this field.
163 //
164 // Usage note: if the same field is accessed multiple times
165 // in the same compilation, will_link will need to be checked
166 // at each point of access.
167 bool will_link(ciInstanceKlass* accessing_klass,
168 Bytecodes::Code bc);
169
170 // Java access flags
171 bool is_public () { return flags().is_public(); }
172 bool is_private () { return flags().is_private(); }
173 bool is_protected () { return flags().is_protected(); }
174 bool is_static () { return flags().is_static(); }
175 bool is_final () { return flags().is_final(); }
176 bool is_stable () { return flags().is_stable(); }
177 bool is_volatile () { return flags().is_volatile(); }
178 bool is_transient () { return flags().is_transient(); }
179
180 bool is_call_site_target() {
181 ciInstanceKlass* callsite_klass = CURRENT_ENV->CallSite_klass();
182 if (callsite_klass == NULL)
183 return false;
184 return (holder()->is_subclass_of(callsite_klass) && (name() == ciSymbol::target_name()));
185 }
186
187 // Debugging output
188 void print();
189 void print_name_on(outputStream* st);
190 };
191
192 #endif // SHARE_VM_CI_CIFIELD_HPP
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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() {
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() {
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 }
126
127 // Is this field a constant? See ciField::initialize_from() for details
128 // about how a field is determined to be constant.
129 bool is_constant() { return _is_constant; }
130
131 // Get the constant value of this field.
132 ciConstant constant_value() {
133 assert(is_static() && is_constant(), "illegal call to constant_value()");
134 return _constant_value;
135 }
136
137 // Get the constant value of non-static final field in the given
138 // object.
139 ciConstant constant_value_of(ciObject* object) {
140 assert(!is_static() && is_constant(), "only if field is non-static constant");
141 assert(object->is_instance(), "must be instance");
142 return object->as_instance()->field_value(this);
143 }
144
145 // Check for link time errors. Accessing a field from a
146 // certain class via a certain bytecode may or may not be legal.
147 // This call checks to see if an exception may be raised by
148 // an access of this field.
149 //
150 // Usage note: if the same field is accessed multiple times
151 // in the same compilation, will_link will need to be checked
152 // at each point of access.
153 bool will_link(ciInstanceKlass* accessing_klass,
154 Bytecodes::Code bc);
155
156 // Java access flags
157 bool is_public () { return flags().is_public(); }
158 bool is_private () { return flags().is_private(); }
159 bool is_protected () { return flags().is_protected(); }
160 bool is_static () { return flags().is_static(); }
161 bool is_final () { return flags().is_final(); }
162 bool is_stable () { return flags().is_stable(); }
163 bool is_volatile () { return flags().is_volatile(); }
164 bool is_transient () { return flags().is_transient(); }
165 // The field is modified outside of instance initializer methods
166 // (or class/initializer methods if the field is static).
167 bool has_initialized_final_update() { return flags().has_initialized_final_update(); }
168
169 bool is_call_site_target() {
170 ciInstanceKlass* callsite_klass = CURRENT_ENV->CallSite_klass();
171 if (callsite_klass == NULL)
172 return false;
173 return (holder()->is_subclass_of(callsite_klass) && (name() == ciSymbol::target_name()));
174 }
175
176 // Debugging output
177 void print();
178 void print_name_on(outputStream* st);
179 };
180
181 #endif // SHARE_VM_CI_CIFIELD_HPP
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