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303 lines
16 KiB
C++
303 lines
16 KiB
C++
/*
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* Copyright (c) 1997, 2015, 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 : public StackObj {
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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, const methodHandle& resolved_method, TRAPS);
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void set_interface(KlassHandle resolved_klass, KlassHandle selected_klass,
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const methodHandle& resolved_method,
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const methodHandle& selected_method,
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int itable_index, TRAPS);
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void set_virtual(KlassHandle resolved_klass, KlassHandle selected_klass,
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const methodHandle& resolved_method,
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const methodHandle& selected_method,
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int vtable_index, TRAPS);
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void set_handle(const methodHandle& resolved_method,
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Handle resolved_appendix, Handle resolved_method_type, TRAPS);
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void set_common(KlassHandle resolved_klass, KlassHandle selected_klass,
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const methodHandle& resolved_method,
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const methodHandle& selected_method,
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CallKind kind,
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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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// Condensed information from constant pool to use to resolve the method or field.
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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
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// containing the call being resolved)
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class LinkInfo : public StackObj {
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Symbol* _name; // extracted from JVM_CONSTANT_NameAndType
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Symbol* _signature;
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KlassHandle _resolved_klass; // class that the constant pool entry points to
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KlassHandle _current_klass; // class that owns the constant pool
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bool _check_access;
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public:
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LinkInfo(const constantPoolHandle& pool, int index, TRAPS);
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// Condensed information from other call sites within the vm.
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LinkInfo(KlassHandle resolved_klass, Symbol* name, Symbol* signature,
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KlassHandle current_klass, bool check_access = true) :
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_resolved_klass(resolved_klass),
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_name(name), _signature(signature), _current_klass(current_klass),
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_check_access(check_access) {}
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// accessors
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Symbol* name() const { return _name; }
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Symbol* signature() const { return _signature; }
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KlassHandle resolved_klass() const { return _resolved_klass; }
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KlassHandle current_klass() const { return _current_klass; }
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bool check_access() const { return _check_access; }
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char* method_string() const;
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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 methodHandle lookup_method_in_klasses(const LinkInfo& link_info,
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bool checkpolymorphism,
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bool in_imethod_resolve, TRAPS);
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static methodHandle lookup_method_in_interfaces(const LinkInfo& link_info, TRAPS);
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static methodHandle lookup_polymorphic_method(const LinkInfo& link_info,
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Handle *appendix_result_or_null,
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Handle *method_type_result, TRAPS);
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JVMCI_ONLY(public:) // Needed for CompilerToVM.resolveMethod()
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// Not Linktime so doesn't take LinkInfo
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static methodHandle lookup_instance_method_in_klasses (
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KlassHandle klass, Symbol* name, Symbol* signature, TRAPS);
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JVMCI_ONLY(private:)
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// Similar loader constraint checking functions that throw
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// LinkageError with descriptive message.
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static void check_method_loader_constraints(const LinkInfo& link_info,
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const methodHandle& resolved_method,
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const char* method_type, TRAPS);
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static void check_field_loader_constraints(Symbol* field, Symbol* sig,
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KlassHandle current_klass,
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KlassHandle sel_klass, TRAPS);
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static methodHandle resolve_interface_method(const LinkInfo& link_info, bool nostatics, TRAPS);
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static methodHandle resolve_method (const LinkInfo& link_info, bool require_methodref, TRAPS);
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static methodHandle linktime_resolve_static_method (const LinkInfo& link_info, TRAPS);
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static methodHandle linktime_resolve_special_method (const LinkInfo& link_info, TRAPS);
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static methodHandle linktime_resolve_virtual_method (const LinkInfo& link_info, TRAPS);
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static methodHandle linktime_resolve_interface_method (const LinkInfo& link_info, TRAPS);
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static void runtime_resolve_special_method (CallInfo& result,
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const methodHandle& resolved_method,
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KlassHandle resolved_klass,
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KlassHandle current_klass,
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bool check_access, TRAPS);
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static void runtime_resolve_virtual_method (CallInfo& result,
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const methodHandle& resolved_method,
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KlassHandle resolved_klass,
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Handle recv,
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KlassHandle recv_klass,
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bool check_null_and_abstract, TRAPS);
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static void runtime_resolve_interface_method (CallInfo& result,
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const methodHandle& resolved_method,
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KlassHandle resolved_klass,
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Handle recv,
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KlassHandle recv_klass,
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bool check_null_and_abstract, TRAPS);
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static void check_field_accessability(KlassHandle ref_klass,
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KlassHandle resolved_klass,
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KlassHandle sel_klass,
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const fieldDescriptor& fd, TRAPS);
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static void check_method_accessability(KlassHandle ref_klass,
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KlassHandle resolved_klass,
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KlassHandle sel_klass,
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const methodHandle& sel_method, TRAPS);
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// runtime resolving from constant pool
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static void resolve_invokestatic (CallInfo& result,
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const constantPoolHandle& pool, int index, TRAPS);
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static void resolve_invokespecial (CallInfo& result,
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const constantPoolHandle& pool, int index, TRAPS);
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static void resolve_invokevirtual (CallInfo& result, Handle recv,
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const constantPoolHandle& pool, int index, TRAPS);
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static void resolve_invokeinterface(CallInfo& result, Handle recv,
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const constantPoolHandle& pool, int index, TRAPS);
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static void resolve_invokedynamic (CallInfo& result,
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const constantPoolHandle& pool, int index, TRAPS);
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static void resolve_invokehandle (CallInfo& result,
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const constantPoolHandle& pool, int index, 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);
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// used only from Bytecode_invoke::static_target
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static methodHandle resolve_method_statically(Bytecodes::Code code,
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const constantPoolHandle& pool,
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int index, TRAPS);
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static void resolve_field_access(fieldDescriptor& result,
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const constantPoolHandle& pool,
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int index, Bytecodes::Code byte, TRAPS);
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static void resolve_field(fieldDescriptor& result, const LinkInfo& link_info,
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Bytecodes::Code access_kind,
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bool initialize_class, TRAPS);
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static void resolve_static_call (CallInfo& result,
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const LinkInfo& link_info,
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bool initialize_klass, TRAPS);
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static void resolve_special_call (CallInfo& result,
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const LinkInfo& link_info,
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TRAPS);
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static void resolve_virtual_call (CallInfo& result, Handle recv, KlassHandle recv_klass,
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const LinkInfo& link_info,
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bool check_null_and_abstract, TRAPS);
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static void resolve_interface_call(CallInfo& result, Handle recv, KlassHandle recv_klass,
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const LinkInfo& link_info,
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bool check_null_and_abstract, TRAPS);
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static void resolve_handle_call (CallInfo& result,
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const LinkInfo& link_info, TRAPS);
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static void resolve_dynamic_call (CallInfo& result, Handle bootstrap_specifier,
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Symbol* method_name, Symbol* method_signature,
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KlassHandle current_klass, TRAPS);
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// same as above for compile-time resolution; but returns null handle instead of throwing
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// an exception on error also, does not initialize klass (i.e., no side effects)
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static methodHandle resolve_virtual_call_or_null (KlassHandle receiver_klass,
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const LinkInfo& link_info);
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static methodHandle resolve_interface_call_or_null(KlassHandle receiver_klass,
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const LinkInfo& link_info);
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static methodHandle resolve_static_call_or_null (const LinkInfo& link_info);
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static methodHandle resolve_special_call_or_null (const LinkInfo& link_info);
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static int vtable_index_of_interface_method(KlassHandle klass, const methodHandle& resolved_method);
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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,
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const LinkInfo& link_info);
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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 (const LinkInfo& link_info);
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static methodHandle linktime_resolve_interface_method_or_null(const LinkInfo& link_info);
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// runtime resolving from constant pool
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static void resolve_invoke(CallInfo& result, Handle recv,
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const constantPoolHandle& pool, int index,
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Bytecodes::Code byte, TRAPS);
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private:
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static void trace_method_resolution(const char* prefix, KlassHandle klass,
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KlassHandle resolved_klass,
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const methodHandle& method) PRODUCT_RETURN;
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};
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#endif // SHARE_VM_INTERPRETER_LINKRESOLVER_HPP
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