author | acorn |
Mon, 07 Oct 2013 12:20:28 -0400 | |
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permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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#ifndef SHARE_VM_INTERPRETER_LINKRESOLVER_HPP |
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#define SHARE_VM_INTERPRETER_LINKRESOLVER_HPP |
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#include "oops/method.hpp" |
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#include "utilities/top.hpp" |
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// All the necessary definitions for run-time link resolution. |
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// CallInfo provides all the information gathered for a particular |
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// linked call site after resolving it. A link is any reference |
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// made from within the bytecodes of a method to an object outside of |
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// that method. If the info is invalid, the link has not been resolved |
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// successfully. |
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class CallInfo VALUE_OBJ_CLASS_SPEC { |
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public: |
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// Ways that a method call might be selected (or not) based on receiver type. |
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// Note that an invokevirtual instruction might be linked with no_dispatch, |
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// and an invokeinterface instruction might be linked with any of the three options |
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enum CallKind { |
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direct_call, // jump into resolved_method (must be concrete) |
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vtable_call, // select recv.klass.method_at_vtable(index) |
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itable_call, // select recv.klass.method_at_itable(resolved_method.holder, index) |
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unknown_kind = -1 |
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}; |
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private: |
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KlassHandle _resolved_klass; // static receiver klass, resolved from a symbolic reference |
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KlassHandle _selected_klass; // dynamic receiver class (same as static, or subklass) |
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methodHandle _resolved_method; // static target method |
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methodHandle _selected_method; // dynamic (actual) target method |
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CallKind _call_kind; // kind of call (static(=bytecode static/special + |
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// others inferred), vtable, itable) |
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int _call_index; // vtable or itable index of selected class method (if any) |
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Handle _resolved_appendix; // extra argument in constant pool (if CPCE::has_appendix) |
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Handle _resolved_method_type; // MethodType (for invokedynamic and invokehandle call sites) |
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void set_static( KlassHandle resolved_klass, methodHandle resolved_method , TRAPS); |
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void set_interface(KlassHandle resolved_klass, KlassHandle selected_klass, methodHandle resolved_method, methodHandle selected_method, int itable_index , TRAPS); |
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void set_virtual( KlassHandle resolved_klass, KlassHandle selected_klass, methodHandle resolved_method, methodHandle selected_method, int vtable_index , TRAPS); |
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void set_handle( methodHandle resolved_method, Handle resolved_appendix, Handle resolved_method_type, TRAPS); |
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void set_common( KlassHandle resolved_klass, KlassHandle selected_klass, methodHandle resolved_method, methodHandle selected_method, CallKind kind, int index, TRAPS); |
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friend class LinkResolver; |
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public: |
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CallInfo() { |
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#ifndef PRODUCT |
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_call_kind = CallInfo::unknown_kind; |
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_call_index = Method::garbage_vtable_index; |
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#endif //PRODUCT |
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} |
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// utility to extract an effective CallInfo from a method and an optional receiver limit |
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// does not queue the method for compilation |
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CallInfo(Method* resolved_method, Klass* resolved_klass = NULL); |
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KlassHandle resolved_klass() const { return _resolved_klass; } |
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KlassHandle selected_klass() const { return _selected_klass; } |
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methodHandle resolved_method() const { return _resolved_method; } |
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methodHandle selected_method() const { return _selected_method; } |
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Handle resolved_appendix() const { return _resolved_appendix; } |
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Handle resolved_method_type() const { return _resolved_method_type; } |
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BasicType result_type() const { return selected_method()->result_type(); } |
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CallKind call_kind() const { return _call_kind; } |
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int call_index() const { return _call_index; } |
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int vtable_index() const { |
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// Even for interface calls the vtable index could be non-negative. |
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// See CallInfo::set_interface. |
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assert(has_vtable_index() || is_statically_bound(), ""); |
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assert(call_kind() == vtable_call || call_kind() == direct_call, ""); |
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// The returned value is < 0 if the call is statically bound. |
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// But, the returned value may be >= 0 even if the kind is direct_call. |
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// It is up to the caller to decide which way to go. |
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return _call_index; |
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} |
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int itable_index() const { |
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assert(call_kind() == itable_call, ""); |
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// The returned value is always >= 0, a valid itable index. |
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return _call_index; |
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} |
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// debugging |
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#ifdef ASSERT |
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bool has_vtable_index() const { return _call_index >= 0 && _call_kind != CallInfo::itable_call; } |
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bool is_statically_bound() const { return _call_index == Method::nonvirtual_vtable_index; } |
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#endif //ASSERT |
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void verify() PRODUCT_RETURN; |
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void print() PRODUCT_RETURN; |
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}; |
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// Link information for getfield/putfield & getstatic/putstatic bytecodes |
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// is represented using a fieldDescriptor. |
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// The LinkResolver is used to resolve constant-pool references at run-time. |
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// It does all necessary link-time checks & throws exceptions if necessary. |
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class LinkResolver: AllStatic { |
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friend class klassVtable; |
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friend class klassItable; |
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private: |
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static void lookup_method_in_klasses (methodHandle& result, KlassHandle klass, Symbol* name, Symbol* signature, TRAPS); |
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static void lookup_instance_method_in_klasses (methodHandle& result, KlassHandle klass, Symbol* name, Symbol* signature, TRAPS); |
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static void lookup_method_in_interfaces (methodHandle& result, KlassHandle klass, Symbol* name, Symbol* signature, TRAPS); |
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static void lookup_polymorphic_method (methodHandle& result, KlassHandle klass, Symbol* name, Symbol* signature, |
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KlassHandle current_klass, Handle *appendix_result_or_null, Handle *method_type_result, TRAPS); |
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static int vtable_index_of_interface_method(KlassHandle klass, methodHandle resolved_method, TRAPS); |
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static void resolve_klass (KlassHandle& result, constantPoolHandle pool, int index, TRAPS); |
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static void resolve_pool (KlassHandle& resolved_klass, Symbol*& method_name, Symbol*& method_signature, KlassHandle& current_klass, constantPoolHandle pool, int index, TRAPS); |
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static void resolve_interface_method(methodHandle& resolved_method, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access, TRAPS); |
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static void resolve_method (methodHandle& resolved_method, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access, TRAPS); |
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static void linktime_resolve_static_method (methodHandle& resolved_method, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access, TRAPS); |
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static void linktime_resolve_special_method (methodHandle& resolved_method, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access, TRAPS); |
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static void linktime_resolve_virtual_method (methodHandle &resolved_method, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature,KlassHandle current_klass, bool check_access, TRAPS); |
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static void linktime_resolve_interface_method (methodHandle& resolved_method, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access, TRAPS); |
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static void runtime_resolve_special_method (CallInfo& result, methodHandle resolved_method, KlassHandle resolved_klass, KlassHandle current_klass, bool check_access, TRAPS); |
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static void runtime_resolve_virtual_method (CallInfo& result, methodHandle resolved_method, KlassHandle resolved_klass, Handle recv, KlassHandle recv_klass, bool check_null_and_abstract, TRAPS); |
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static void runtime_resolve_interface_method (CallInfo& result, methodHandle resolved_method, KlassHandle resolved_klass, Handle recv, KlassHandle recv_klass, bool check_null_and_abstract, TRAPS); |
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static void check_field_accessability (KlassHandle ref_klass, KlassHandle resolved_klass, KlassHandle sel_klass, fieldDescriptor& fd, TRAPS); |
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static void check_method_accessability (KlassHandle ref_klass, KlassHandle resolved_klass, KlassHandle sel_klass, methodHandle sel_method, TRAPS); |
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public: |
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// constant pool resolving |
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static void check_klass_accessability(KlassHandle ref_klass, KlassHandle sel_klass, TRAPS); |
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// static resolving calls (will not run any Java code); used only from Bytecode_invoke::static_target |
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static void resolve_method_statically(methodHandle& method_result, KlassHandle& klass_result, |
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Bytecodes::Code code, constantPoolHandle pool, int index, TRAPS); |
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// runtime/static resolving for fields |
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static void resolve_field_access(fieldDescriptor& result, constantPoolHandle pool, int index, Bytecodes::Code byte, TRAPS); |
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static void resolve_field(fieldDescriptor& result, KlassHandle resolved_klass, Symbol* field_name, Symbol* field_signature, |
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KlassHandle current_klass, Bytecodes::Code access_kind, bool check_access, bool initialize_class, TRAPS); |
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// source of access_kind codes: |
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static Bytecodes::Code field_access_kind(bool is_static, bool is_put) { |
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return (is_static |
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? (is_put ? Bytecodes::_putstatic : Bytecodes::_getstatic) |
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: (is_put ? Bytecodes::_putfield : Bytecodes::_getfield )); |
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} |
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// runtime resolving: |
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// resolved_klass = specified class (i.e., static receiver class) |
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// current_klass = sending method holder (i.e., class containing the method containing the call being resolved) |
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static void resolve_static_call (CallInfo& result, KlassHandle& resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access, bool initialize_klass, TRAPS); |
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static void resolve_special_call (CallInfo& result, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access, TRAPS); |
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static void resolve_virtual_call (CallInfo& result, Handle recv, KlassHandle recv_klass, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access, bool check_null_and_abstract, TRAPS); |
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static void resolve_interface_call(CallInfo& result, Handle recv, KlassHandle recv_klass, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access, bool check_null_and_abstract, TRAPS); |
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static void resolve_handle_call (CallInfo& result, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, TRAPS); |
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static void resolve_dynamic_call (CallInfo& result, Handle bootstrap_specifier, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, TRAPS); |
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// same as above for compile-time resolution; but returns null handle instead of throwing an exception on error |
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// also, does not initialize klass (i.e., no side effects) |
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static methodHandle resolve_virtual_call_or_null (KlassHandle receiver_klass, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass); |
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static methodHandle resolve_interface_call_or_null(KlassHandle receiver_klass, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass); |
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static methodHandle resolve_static_call_or_null (KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass); |
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static methodHandle resolve_special_call_or_null (KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass); |
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// same as above for compile-time resolution; returns vtable_index if current_klass if linked |
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static int resolve_virtual_vtable_index (KlassHandle receiver_klass, KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass); |
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// static resolving for compiler (does not throw exceptions, returns null handle if unsuccessful) |
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static methodHandle linktime_resolve_virtual_method_or_null (KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access); |
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static methodHandle linktime_resolve_interface_method_or_null(KlassHandle resolved_klass, Symbol* method_name, Symbol* method_signature, KlassHandle current_klass, bool check_access); |
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// runtime resolving from constant pool |
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static void resolve_invokestatic (CallInfo& result, constantPoolHandle pool, int index, TRAPS); |
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static void resolve_invokespecial (CallInfo& result, constantPoolHandle pool, int index, TRAPS); |
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static void resolve_invokevirtual (CallInfo& result, Handle recv, constantPoolHandle pool, int index, TRAPS); |
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static void resolve_invokeinterface(CallInfo& result, Handle recv, constantPoolHandle pool, int index, TRAPS); |
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static void resolve_invokedynamic (CallInfo& result, constantPoolHandle pool, int index, TRAPS); |
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static void resolve_invokehandle (CallInfo& result, constantPoolHandle pool, int index, TRAPS); |
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static void resolve_invoke (CallInfo& result, Handle recv, constantPoolHandle pool, int index, Bytecodes::Code byte, TRAPS); |
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}; |
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#endif // SHARE_VM_INTERPRETER_LINKRESOLVER_HPP |