diff -r 4ebc2e2fb97c -r 71c04702a3d5 src/hotspot/share/interpreter/linkResolver.hpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/hotspot/share/interpreter/linkResolver.hpp Tue Sep 12 19:03:39 2017 +0200 @@ -0,0 +1,343 @@ +/* + * Copyright (c) 1997, 2017, 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; } + char* method_string() const; + + 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, 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 methodHandle& resolved_method, + Klass* resolved_klass, + Klass* current_klass, + Handle recv, + bool check_access, 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, TRAPS); + + // 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, 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); +}; +#endif // SHARE_VM_INTERPRETER_LINKRESOLVER_HPP