| /* |
| * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| * |
| */ |
| |
| #ifndef SHARE_VM_INTERPRETER_LINKRESOLVER_HPP |
| #define SHARE_VM_INTERPRETER_LINKRESOLVER_HPP |
| |
| #include "oops/method.hpp" |
| |
| // All the necessary definitions for run-time link resolution. |
| |
| // CallInfo provides all the information gathered for a particular |
| // linked call site after resolving it. A link is any reference |
| // made from within the bytecodes of a method to an object outside of |
| // that method. If the info is invalid, the link has not been resolved |
| // successfully. |
| |
| class CallInfo : public StackObj { |
| public: |
| // Ways that a method call might be selected (or not) based on receiver type. |
| // Note that an invokevirtual instruction might be linked with no_dispatch, |
| // and an invokeinterface instruction might be linked with any of the three options |
| enum CallKind { |
| direct_call, // jump into resolved_method (must be concrete) |
| vtable_call, // select recv.klass.method_at_vtable(index) |
| itable_call, // select recv.klass.method_at_itable(resolved_method.holder, index) |
| unknown_kind = -1 |
| }; |
| private: |
| Klass* _resolved_klass; // static receiver klass, resolved from a symbolic reference |
| Klass* _selected_klass; // dynamic receiver class (same as static, or subklass) |
| methodHandle _resolved_method; // static target method |
| methodHandle _selected_method; // dynamic (actual) target method |
| CallKind _call_kind; // kind of call (static(=bytecode static/special + |
| // others inferred), vtable, itable) |
| int _call_index; // vtable or itable index of selected class method (if any) |
| Handle _resolved_appendix; // extra argument in constant pool (if CPCE::has_appendix) |
| Handle _resolved_method_type; // MethodType (for invokedynamic and invokehandle call sites) |
| Handle _resolved_method_name; // Object holding the ResolvedMethodName |
| |
| void set_static(Klass* resolved_klass, const methodHandle& resolved_method, TRAPS); |
| void set_interface(Klass* resolved_klass, Klass* selected_klass, |
| const methodHandle& resolved_method, |
| const methodHandle& selected_method, |
| int itable_index, TRAPS); |
| void set_virtual(Klass* resolved_klass, Klass* selected_klass, |
| const methodHandle& resolved_method, |
| const methodHandle& selected_method, |
| int vtable_index, TRAPS); |
| void set_handle(const methodHandle& resolved_method, |
| Handle resolved_appendix, Handle resolved_method_type, TRAPS); |
| void set_handle(Klass* resolved_klass, |
| const methodHandle& resolved_method, |
| Handle resolved_appendix, Handle resolved_method_type, TRAPS); |
| void set_common(Klass* resolved_klass, Klass* selected_klass, |
| const methodHandle& resolved_method, |
| const methodHandle& selected_method, |
| CallKind kind, |
| int index, TRAPS); |
| |
| friend class LinkResolver; |
| |
| public: |
| CallInfo() { |
| #ifndef PRODUCT |
| _call_kind = CallInfo::unknown_kind; |
| _call_index = Method::garbage_vtable_index; |
| #endif //PRODUCT |
| } |
| |
| // utility to extract an effective CallInfo from a method and an optional receiver limit |
| // does not queue the method for compilation. This also creates a ResolvedMethodName |
| // object for the resolved_method. |
| CallInfo(Method* resolved_method, Klass* resolved_klass, TRAPS); |
| |
| Klass* resolved_klass() const { return _resolved_klass; } |
| Klass* selected_klass() const { return _selected_klass; } |
| methodHandle resolved_method() const { return _resolved_method; } |
| methodHandle selected_method() const { return _selected_method; } |
| Handle resolved_appendix() const { return _resolved_appendix; } |
| Handle resolved_method_type() const { return _resolved_method_type; } |
| Handle resolved_method_name() const { return _resolved_method_name; } |
| // Materialize a java.lang.invoke.ResolvedMethodName for this resolved_method |
| void set_resolved_method_name(TRAPS); |
| |
| BasicType result_type() const { return selected_method()->result_type(); } |
| CallKind call_kind() const { return _call_kind; } |
| int call_index() const { return _call_index; } |
| int vtable_index() const { |
| // Even for interface calls the vtable index could be non-negative. |
| // See CallInfo::set_interface. |
| assert(has_vtable_index() || is_statically_bound(), ""); |
| assert(call_kind() == vtable_call || call_kind() == direct_call, ""); |
| // The returned value is < 0 if the call is statically bound. |
| // But, the returned value may be >= 0 even if the kind is direct_call. |
| // It is up to the caller to decide which way to go. |
| return _call_index; |
| } |
| int itable_index() const { |
| assert(call_kind() == itable_call, ""); |
| // The returned value is always >= 0, a valid itable index. |
| return _call_index; |
| } |
| |
| // debugging |
| #ifdef ASSERT |
| bool has_vtable_index() const { return _call_index >= 0 && _call_kind != CallInfo::itable_call; } |
| bool is_statically_bound() const { return _call_index == Method::nonvirtual_vtable_index; } |
| #endif //ASSERT |
| void verify() PRODUCT_RETURN; |
| void print() PRODUCT_RETURN; |
| }; |
| |
| |
| // Condensed information from constant pool to use to resolve the method or field. |
| // resolved_klass = specified class (i.e., static receiver class) |
| // current_klass = sending method holder (i.e., class containing the method |
| // containing the call being resolved) |
| // current_method = sending method (relevant for field resolution) |
| class LinkInfo : public StackObj { |
| Symbol* _name; // extracted from JVM_CONSTANT_NameAndType |
| Symbol* _signature; |
| Klass* _resolved_klass; // class that the constant pool entry points to |
| Klass* _current_klass; // class that owns the constant pool |
| methodHandle _current_method; // sending method |
| bool _check_access; |
| constantTag _tag; |
| |
| public: |
| enum AccessCheck { |
| needs_access_check, |
| skip_access_check |
| }; |
| |
| LinkInfo(const constantPoolHandle& pool, int index, const methodHandle& current_method, TRAPS); |
| LinkInfo(const constantPoolHandle& pool, int index, TRAPS); |
| |
| // Condensed information from other call sites within the vm. |
| LinkInfo(Klass* resolved_klass, Symbol* name, Symbol* signature, Klass* current_klass, |
| AccessCheck check_access = needs_access_check, |
| constantTag tag = JVM_CONSTANT_Invalid) : |
| _resolved_klass(resolved_klass), |
| _name(name), _signature(signature), _current_klass(current_klass), _current_method(methodHandle()), |
| _check_access(check_access == needs_access_check), _tag(tag) {} |
| |
| LinkInfo(Klass* resolved_klass, Symbol* name, Symbol* signature, const methodHandle& current_method, |
| AccessCheck check_access = needs_access_check, |
| constantTag tag = JVM_CONSTANT_Invalid) : |
| _resolved_klass(resolved_klass), |
| _name(name), _signature(signature), _current_klass(current_method->method_holder()), _current_method(current_method), |
| _check_access(check_access == needs_access_check), _tag(tag) {} |
| |
| // Case where we just find the method and don't check access against the current class |
| LinkInfo(Klass* resolved_klass, Symbol*name, Symbol* signature) : |
| _resolved_klass(resolved_klass), |
| _name(name), _signature(signature), _current_klass(NULL), _current_method(methodHandle()), |
| _check_access(false), _tag(JVM_CONSTANT_Invalid) {} |
| |
| // accessors |
| Symbol* name() const { return _name; } |
| Symbol* signature() const { return _signature; } |
| Klass* resolved_klass() const { return _resolved_klass; } |
| Klass* current_klass() const { return _current_klass; } |
| methodHandle current_method() const { return _current_method; } |
| constantTag tag() const { return _tag; } |
| bool check_access() const { return _check_access; } |
| |
| void print() PRODUCT_RETURN; |
| }; |
| |
| // Link information for getfield/putfield & getstatic/putstatic bytecodes |
| // is represented using a fieldDescriptor. |
| |
| // The LinkResolver is used to resolve constant-pool references at run-time. |
| // It does all necessary link-time checks & throws exceptions if necessary. |
| |
| class LinkResolver: AllStatic { |
| friend class klassVtable; |
| friend class klassItable; |
| |
| private: |
| |
| static Method* lookup_method_in_klasses(const LinkInfo& link_info, |
| bool checkpolymorphism, |
| bool in_imethod_resolve); |
| static Method* lookup_method_in_interfaces(const LinkInfo& link_info); |
| |
| static methodHandle lookup_polymorphic_method(const LinkInfo& link_info, |
| Handle *appendix_result_or_null, |
| Handle *method_type_result, TRAPS); |
| JVMCI_ONLY(public:) // Needed for CompilerToVM.resolveMethod() |
| // Not Linktime so doesn't take LinkInfo |
| static methodHandle lookup_instance_method_in_klasses (Klass* klass, Symbol* name, Symbol* signature, |
| Klass::PrivateLookupMode private_mode, TRAPS); |
| JVMCI_ONLY(private:) |
| |
| // Similar loader constraint checking functions that throw |
| // LinkageError with descriptive message. |
| static void check_method_loader_constraints(const LinkInfo& link_info, |
| const methodHandle& resolved_method, |
| const char* method_type, TRAPS); |
| static void check_field_loader_constraints(Symbol* field, Symbol* sig, |
| Klass* current_klass, |
| Klass* sel_klass, TRAPS); |
| |
| static methodHandle resolve_interface_method(const LinkInfo& link_info, Bytecodes::Code code, TRAPS); |
| static methodHandle resolve_method (const LinkInfo& link_info, Bytecodes::Code code, TRAPS); |
| |
| static methodHandle linktime_resolve_static_method (const LinkInfo& link_info, TRAPS); |
| static methodHandle linktime_resolve_special_method (const LinkInfo& link_info, TRAPS); |
| static methodHandle linktime_resolve_virtual_method (const LinkInfo& link_info, TRAPS); |
| static methodHandle linktime_resolve_interface_method (const LinkInfo& link_info, TRAPS); |
| |
| static void runtime_resolve_special_method (CallInfo& result, |
| const LinkInfo& link_info, |
| const methodHandle& resolved_method, |
| Handle recv, TRAPS); |
| |
| static void runtime_resolve_virtual_method (CallInfo& result, |
| const methodHandle& resolved_method, |
| Klass* resolved_klass, |
| Handle recv, |
| Klass* recv_klass, |
| bool check_null_and_abstract, TRAPS); |
| static void runtime_resolve_interface_method (CallInfo& result, |
| const methodHandle& resolved_method, |
| Klass* resolved_klass, |
| Handle recv, |
| Klass* recv_klass, |
| bool check_null_and_abstract, TRAPS); |
| |
| static void check_field_accessability(Klass* ref_klass, |
| Klass* resolved_klass, |
| Klass* sel_klass, |
| const fieldDescriptor& fd, TRAPS); |
| static void check_method_accessability(Klass* ref_klass, |
| Klass* resolved_klass, |
| Klass* sel_klass, |
| const methodHandle& sel_method, TRAPS); |
| |
| // runtime resolving from constant pool |
| static void resolve_invokestatic (CallInfo& result, |
| const constantPoolHandle& pool, int index, TRAPS); |
| static void resolve_invokespecial (CallInfo& result, Handle recv, |
| const constantPoolHandle& pool, int index, TRAPS); |
| static void resolve_invokevirtual (CallInfo& result, Handle recv, |
| const constantPoolHandle& pool, int index, TRAPS); |
| static void resolve_invokeinterface(CallInfo& result, Handle recv, |
| const constantPoolHandle& pool, int index, TRAPS); |
| static void resolve_invokedynamic (CallInfo& result, |
| const constantPoolHandle& pool, int index, TRAPS); |
| static void resolve_invokehandle (CallInfo& result, |
| const constantPoolHandle& pool, int index, TRAPS); |
| public: |
| // constant pool resolving |
| static void check_klass_accessability(Klass* ref_klass, Klass* sel_klass, |
| bool fold_type_to_class, TRAPS); |
| // The optional 'fold_type_to_class' means that a derived type (array) |
| // is first converted to the class it is derived from (element type). |
| // If this element type is not a class, then the check passes quietly. |
| // This is usually what is needed, but a few existing uses might break |
| // if this flag were always turned on. FIXME: See if it can be, always. |
| static void check_klass_accessability(Klass* ref_klass, Klass* sel_klass, TRAPS) { |
| return check_klass_accessability(ref_klass, sel_klass, false, THREAD); |
| } |
| |
| // static resolving calls (will not run any Java code); |
| // used only from Bytecode_invoke::static_target |
| static methodHandle resolve_method_statically(Bytecodes::Code code, |
| const constantPoolHandle& pool, |
| int index, TRAPS); |
| |
| static void resolve_field_access(fieldDescriptor& result, |
| const constantPoolHandle& pool, |
| int index, |
| const methodHandle& method, |
| Bytecodes::Code byte, TRAPS); |
| static void resolve_field(fieldDescriptor& result, const LinkInfo& link_info, |
| Bytecodes::Code access_kind, |
| bool initialize_class, TRAPS); |
| |
| static void resolve_static_call (CallInfo& result, |
| const LinkInfo& link_info, |
| bool initialize_klass, TRAPS); |
| static void resolve_special_call (CallInfo& result, |
| Handle recv, |
| const LinkInfo& link_info, |
| TRAPS); |
| static void resolve_virtual_call (CallInfo& result, Handle recv, Klass* recv_klass, |
| const LinkInfo& link_info, |
| bool check_null_and_abstract, TRAPS); |
| static void resolve_interface_call(CallInfo& result, Handle recv, Klass* recv_klass, |
| const LinkInfo& link_info, |
| bool check_null_and_abstract, TRAPS); |
| static void resolve_handle_call (CallInfo& result, |
| const LinkInfo& link_info, TRAPS); |
| static void resolve_dynamic_call (CallInfo& result, int pool_index, Handle bootstrap_specifier, |
| Symbol* method_name, Symbol* method_signature, |
| Klass* current_klass, TRAPS); |
| |
| // same as above for compile-time resolution; but returns null handle instead of throwing |
| // an exception on error also, does not initialize klass (i.e., no side effects) |
| static methodHandle resolve_virtual_call_or_null (Klass* receiver_klass, |
| const LinkInfo& link_info); |
| static methodHandle resolve_interface_call_or_null(Klass* receiver_klass, |
| const LinkInfo& link_info); |
| static methodHandle resolve_static_call_or_null (const LinkInfo& link_info); |
| static methodHandle resolve_special_call_or_null (const LinkInfo& link_info); |
| |
| static int vtable_index_of_interface_method(Klass* klass, const methodHandle& resolved_method); |
| |
| // same as above for compile-time resolution; returns vtable_index if current_klass if linked |
| static int resolve_virtual_vtable_index (Klass* receiver_klass, |
| const LinkInfo& link_info); |
| |
| // static resolving for compiler (does not throw exceptions, returns null handle if unsuccessful) |
| static methodHandle linktime_resolve_virtual_method_or_null (const LinkInfo& link_info); |
| static methodHandle linktime_resolve_interface_method_or_null(const LinkInfo& link_info); |
| |
| // runtime resolving from constant pool |
| static void resolve_invoke(CallInfo& result, Handle recv, |
| const constantPoolHandle& pool, int index, |
| Bytecodes::Code byte, TRAPS); |
| |
| // runtime resolving from attached method |
| static void resolve_invoke(CallInfo& result, Handle& recv, |
| const methodHandle& attached_method, |
| Bytecodes::Code byte, TRAPS); |
| |
| public: |
| // Only resolved method known. |
| static void throw_abstract_method_error(const methodHandle& resolved_method, TRAPS) { |
| throw_abstract_method_error(resolved_method, NULL, NULL, CHECK); |
| } |
| // Resolved method and receiver klass know. |
| static void throw_abstract_method_error(const methodHandle& resolved_method, Klass *recv_klass, TRAPS) { |
| throw_abstract_method_error(resolved_method, NULL, recv_klass, CHECK); |
| } |
| // Selected method is abstract. |
| static void throw_abstract_method_error(const methodHandle& resolved_method, |
| const methodHandle& selected_method, |
| Klass *recv_klass, TRAPS); |
| }; |
| #endif // SHARE_VM_INTERPRETER_LINKRESOLVER_HPP |
