135 // Condensed information from constant pool to use to resolve the method or field.
136 // resolved_klass = specified class (i.e., static receiver class)
137 // current_klass = sending method holder (i.e., class containing the method
138 // containing the call being resolved)
139 // current_method = sending method (relevant for field resolution)
140 class LinkInfo : public StackObj {
141 Symbol* _name; // extracted from JVM_CONSTANT_NameAndType
142 Symbol* _signature;
143 Klass* _resolved_klass; // class that the constant pool entry points to
144 Klass* _current_klass; // class that owns the constant pool
145 methodHandle _current_method; // sending method
146 bool _check_access;
147 constantTag _tag;
148
149 public:
150 enum AccessCheck {
151 needs_access_check,
152 skip_access_check
153 };
154
155 LinkInfo(const constantPoolHandle& pool, int index, methodHandle current_method, TRAPS);
156 LinkInfo(const constantPoolHandle& pool, int index, TRAPS);
157
158 // Condensed information from other call sites within the vm.
159 LinkInfo(Klass* resolved_klass, Symbol* name, Symbol* signature, Klass* current_klass,
160 AccessCheck check_access = needs_access_check,
161 constantTag tag = JVM_CONSTANT_Invalid) :
162 _resolved_klass(resolved_klass),
163 _name(name), _signature(signature), _current_klass(current_klass), _current_method(methodHandle()),
164 _check_access(check_access == needs_access_check), _tag(tag) {}
165
166 LinkInfo(Klass* resolved_klass, Symbol* name, Symbol* signature, methodHandle current_method,
167 AccessCheck check_access = needs_access_check,
168 constantTag tag = JVM_CONSTANT_Invalid) :
169 _resolved_klass(resolved_klass),
170 _name(name), _signature(signature), _current_klass(current_method->method_holder()), _current_method(current_method),
171 _check_access(check_access == needs_access_check), _tag(tag) {}
172
173 // Case where we just find the method and don't check access against the current class
174 LinkInfo(Klass* resolved_klass, Symbol*name, Symbol* signature) :
175 _resolved_klass(resolved_klass),
176 _name(name), _signature(signature), _current_klass(NULL), _current_method(methodHandle()),
177 _check_access(false), _tag(JVM_CONSTANT_Invalid) {}
178
179 // accessors
180 Symbol* name() const { return _name; }
181 Symbol* signature() const { return _signature; }
182 Klass* resolved_klass() const { return _resolved_klass; }
183 Klass* current_klass() const { return _current_klass; }
184 methodHandle current_method() const { return _current_method; }
185 constantTag tag() const { return _tag; }
186 bool check_access() const { return _check_access; }
187 char* method_string() const;
188
189 void print() PRODUCT_RETURN;
190 };
191
192 // Link information for getfield/putfield & getstatic/putstatic bytecodes
193 // is represented using a fieldDescriptor.
194
195 // The LinkResolver is used to resolve constant-pool references at run-time.
196 // It does all necessary link-time checks & throws exceptions if necessary.
197
198 class LinkResolver: AllStatic {
199 friend class klassVtable;
200 friend class klassItable;
201
202 private:
203
204 static methodHandle lookup_method_in_klasses(const LinkInfo& link_info,
205 bool checkpolymorphism,
206 bool in_imethod_resolve, TRAPS);
207 static methodHandle lookup_method_in_interfaces(const LinkInfo& link_info, TRAPS);
208 static methodHandle lookup_polymorphic_method(const LinkInfo& link_info,
209 Handle *appendix_result_or_null,
210 Handle *method_type_result, TRAPS);
211 JVMCI_ONLY(public:) // Needed for CompilerToVM.resolveMethod()
212 // Not Linktime so doesn't take LinkInfo
213 static methodHandle lookup_instance_method_in_klasses (
214 Klass* klass, Symbol* name, Symbol* signature, TRAPS);
215 JVMCI_ONLY(private:)
216
217 // Similar loader constraint checking functions that throw
218 // LinkageError with descriptive message.
219 static void check_method_loader_constraints(const LinkInfo& link_info,
220 const methodHandle& resolved_method,
221 const char* method_type, TRAPS);
222 static void check_field_loader_constraints(Symbol* field, Symbol* sig,
223 Klass* current_klass,
224 Klass* sel_klass, TRAPS);
225
226 static methodHandle resolve_interface_method(const LinkInfo& link_info, Bytecodes::Code code, TRAPS);
227 static methodHandle resolve_method (const LinkInfo& link_info, Bytecodes::Code code, TRAPS);
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135 // Condensed information from constant pool to use to resolve the method or field.
136 // resolved_klass = specified class (i.e., static receiver class)
137 // current_klass = sending method holder (i.e., class containing the method
138 // containing the call being resolved)
139 // current_method = sending method (relevant for field resolution)
140 class LinkInfo : public StackObj {
141 Symbol* _name; // extracted from JVM_CONSTANT_NameAndType
142 Symbol* _signature;
143 Klass* _resolved_klass; // class that the constant pool entry points to
144 Klass* _current_klass; // class that owns the constant pool
145 methodHandle _current_method; // sending method
146 bool _check_access;
147 constantTag _tag;
148
149 public:
150 enum AccessCheck {
151 needs_access_check,
152 skip_access_check
153 };
154
155 LinkInfo(const constantPoolHandle& pool, int index, const methodHandle& current_method, TRAPS);
156 LinkInfo(const constantPoolHandle& pool, int index, TRAPS);
157
158 // Condensed information from other call sites within the vm.
159 LinkInfo(Klass* resolved_klass, Symbol* name, Symbol* signature, Klass* current_klass,
160 AccessCheck check_access = needs_access_check,
161 constantTag tag = JVM_CONSTANT_Invalid) :
162 _resolved_klass(resolved_klass),
163 _name(name), _signature(signature), _current_klass(current_klass), _current_method(methodHandle()),
164 _check_access(check_access == needs_access_check), _tag(tag) {}
165
166 LinkInfo(Klass* resolved_klass, Symbol* name, Symbol* signature, const methodHandle& current_method,
167 AccessCheck check_access = needs_access_check,
168 constantTag tag = JVM_CONSTANT_Invalid) :
169 _resolved_klass(resolved_klass),
170 _name(name), _signature(signature), _current_klass(current_method->method_holder()), _current_method(current_method),
171 _check_access(check_access == needs_access_check), _tag(tag) {}
172
173 // Case where we just find the method and don't check access against the current class
174 LinkInfo(Klass* resolved_klass, Symbol*name, Symbol* signature) :
175 _resolved_klass(resolved_klass),
176 _name(name), _signature(signature), _current_klass(NULL), _current_method(methodHandle()),
177 _check_access(false), _tag(JVM_CONSTANT_Invalid) {}
178
179 // accessors
180 Symbol* name() const { return _name; }
181 Symbol* signature() const { return _signature; }
182 Klass* resolved_klass() const { return _resolved_klass; }
183 Klass* current_klass() const { return _current_klass; }
184 methodHandle current_method() const { return _current_method; }
185 constantTag tag() const { return _tag; }
186 bool check_access() const { return _check_access; }
187 char* method_string() const;
188
189 void print() PRODUCT_RETURN;
190 };
191
192 // Link information for getfield/putfield & getstatic/putstatic bytecodes
193 // is represented using a fieldDescriptor.
194
195 // The LinkResolver is used to resolve constant-pool references at run-time.
196 // It does all necessary link-time checks & throws exceptions if necessary.
197
198 class LinkResolver: AllStatic {
199 friend class klassVtable;
200 friend class klassItable;
201
202 private:
203
204 static Method* lookup_method_in_klasses(const LinkInfo& link_info,
205 bool checkpolymorphism,
206 bool in_imethod_resolve);
207 static Method* lookup_method_in_interfaces(const LinkInfo& link_info);
208
209 static methodHandle lookup_polymorphic_method(const LinkInfo& link_info,
210 Handle *appendix_result_or_null,
211 Handle *method_type_result, TRAPS);
212 JVMCI_ONLY(public:) // Needed for CompilerToVM.resolveMethod()
213 // Not Linktime so doesn't take LinkInfo
214 static methodHandle lookup_instance_method_in_klasses (
215 Klass* klass, Symbol* name, Symbol* signature, TRAPS);
216 JVMCI_ONLY(private:)
217
218 // Similar loader constraint checking functions that throw
219 // LinkageError with descriptive message.
220 static void check_method_loader_constraints(const LinkInfo& link_info,
221 const methodHandle& resolved_method,
222 const char* method_type, TRAPS);
223 static void check_field_loader_constraints(Symbol* field, Symbol* sig,
224 Klass* current_klass,
225 Klass* sel_klass, TRAPS);
226
227 static methodHandle resolve_interface_method(const LinkInfo& link_info, Bytecodes::Code code, TRAPS);
228 static methodHandle resolve_method (const LinkInfo& link_info, Bytecodes::Code code, TRAPS);
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