--- /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