author | tschatzl |
Wed, 08 Aug 2018 15:31:07 +0200 | |
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/* |
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* Copyright (c) 1997, 2018, 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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// 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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Klass* _resolved_klass; // static receiver klass, resolved from a symbolic reference |
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Klass* _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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Handle _resolved_method_name; // Object holding the ResolvedMethodName |
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void set_static(Klass* resolved_klass, const methodHandle& resolved_method, TRAPS); |
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void set_interface(Klass* resolved_klass, Klass* 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(Klass* resolved_klass, Klass* 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_handle(Klass* resolved_klass, |
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const methodHandle& resolved_method, |
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Handle resolved_appendix, Handle resolved_method_type, TRAPS); |
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void set_common(Klass* resolved_klass, Klass* 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. This also creates a ResolvedMethodName |
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// object for the resolved_method. |
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CallInfo(Method* resolved_method, Klass* resolved_klass, TRAPS); |
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Klass* resolved_klass() const { return _resolved_klass; } |
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Klass* 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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Handle resolved_method_name() const { return _resolved_method_name; } |
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// Materialize a java.lang.invoke.ResolvedMethodName for this resolved_method |
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void set_resolved_method_name(TRAPS); |
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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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// current_method = sending method (relevant for field resolution) |
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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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Klass* _resolved_klass; // class that the constant pool entry points to |
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Klass* _current_klass; // class that owns the constant pool |
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methodHandle _current_method; // sending method |
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bool _check_access; |
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constantTag _tag; |
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public: |
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enum AccessCheck { |
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needs_access_check, |
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skip_access_check |
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}; |
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LinkInfo(const constantPoolHandle& pool, int index, const methodHandle& current_method, TRAPS); |
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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(Klass* resolved_klass, Symbol* name, Symbol* signature, Klass* current_klass, |
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AccessCheck check_access = needs_access_check, |
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constantTag tag = JVM_CONSTANT_Invalid) : |
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_name(name), |
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_signature(signature), _resolved_klass(resolved_klass), _current_klass(current_klass), _current_method(methodHandle()), |
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_check_access(check_access == needs_access_check), _tag(tag) {} |
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LinkInfo(Klass* resolved_klass, Symbol* name, Symbol* signature, const methodHandle& current_method, |
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AccessCheck check_access = needs_access_check, |
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constantTag tag = JVM_CONSTANT_Invalid) : |
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_name(name), |
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_signature(signature), _resolved_klass(resolved_klass), _current_klass(current_method->method_holder()), _current_method(current_method), |
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_check_access(check_access == needs_access_check), _tag(tag) {} |
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|
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// Case where we just find the method and don't check access against the current class |
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LinkInfo(Klass* resolved_klass, Symbol*name, Symbol* signature) : |
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_name(name), |
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_signature(signature), _resolved_klass(resolved_klass), _current_klass(NULL), _current_method(methodHandle()), |
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_check_access(false), _tag(JVM_CONSTANT_Invalid) {} |
31019 | 178 |
|
179 |
// accessors |
|
180 |
Symbol* name() const { return _name; } |
|
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Symbol* signature() const { return _signature; } |
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Klass* resolved_klass() const { return _resolved_klass; } |
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Klass* current_klass() const { return _current_klass; } |
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methodHandle current_method() const { return _current_method; } |
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constantTag tag() const { return _tag; } |
31019 | 186 |
bool check_access() const { return _check_access; } |
187 |
char* method_string() const; |
|
188 |
||
189 |
void print() PRODUCT_RETURN; |
|
190 |
}; |
|
191 |
||
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// Link information for getfield/putfield & getstatic/putstatic bytecodes |
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// is represented using a fieldDescriptor. |
1 | 194 |
|
195 |
// 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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||
198 |
class LinkResolver: AllStatic { |
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friend class klassVtable; |
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friend class klassItable; |
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201 |
|
1 | 202 |
private: |
31019 | 203 |
|
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static Method* lookup_method_in_klasses(const LinkInfo& link_info, |
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bool checkpolymorphism, |
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bool in_imethod_resolve); |
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static Method* lookup_method_in_interfaces(const LinkInfo& link_info); |
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208 |
|
31019 | 209 |
static methodHandle lookup_polymorphic_method(const LinkInfo& link_info, |
210 |
Handle *appendix_result_or_null, |
|
211 |
Handle *method_type_result, TRAPS); |
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JVMCI_ONLY(public:) // Needed for CompilerToVM.resolveMethod() |
31019 | 213 |
// Not Linktime so doesn't take LinkInfo |
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static methodHandle lookup_instance_method_in_klasses (Klass* klass, Symbol* name, Symbol* signature, |
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Klass::PrivateLookupMode private_mode, TRAPS); |
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JVMCI_ONLY(private:) |
1 | 217 |
|
31019 | 218 |
// Similar loader constraint checking functions that throw |
219 |
// LinkageError with descriptive message. |
|
220 |
static void check_method_loader_constraints(const LinkInfo& link_info, |
|
221 |
const methodHandle& resolved_method, |
|
222 |
const char* method_type, TRAPS); |
|
223 |
static void check_field_loader_constraints(Symbol* field, Symbol* sig, |
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Klass* current_klass, |
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225 |
Klass* sel_klass, TRAPS); |
1 | 226 |
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static methodHandle resolve_interface_method(const LinkInfo& link_info, Bytecodes::Code code, TRAPS); |
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static methodHandle resolve_method (const LinkInfo& link_info, Bytecodes::Code code, TRAPS); |
1 | 229 |
|
31019 | 230 |
static methodHandle linktime_resolve_static_method (const LinkInfo& link_info, TRAPS); |
231 |
static methodHandle linktime_resolve_special_method (const LinkInfo& link_info, TRAPS); |
|
232 |
static methodHandle linktime_resolve_virtual_method (const LinkInfo& link_info, TRAPS); |
|
233 |
static methodHandle linktime_resolve_interface_method (const LinkInfo& link_info, TRAPS); |
|
1 | 234 |
|
31019 | 235 |
static void runtime_resolve_special_method (CallInfo& result, |
47401 | 236 |
const LinkInfo& link_info, |
31019 | 237 |
const methodHandle& resolved_method, |
47401 | 238 |
Handle recv, TRAPS); |
239 |
||
31019 | 240 |
static void runtime_resolve_virtual_method (CallInfo& result, |
241 |
const methodHandle& resolved_method, |
|
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242 |
Klass* resolved_klass, |
31019 | 243 |
Handle recv, |
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244 |
Klass* recv_klass, |
31019 | 245 |
bool check_null_and_abstract, TRAPS); |
246 |
static void runtime_resolve_interface_method (CallInfo& result, |
|
247 |
const methodHandle& resolved_method, |
|
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248 |
Klass* resolved_klass, |
31019 | 249 |
Handle recv, |
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250 |
Klass* recv_klass, |
31019 | 251 |
bool check_null_and_abstract, TRAPS); |
1 | 252 |
|
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253 |
static void check_field_accessability(Klass* ref_klass, |
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254 |
Klass* resolved_klass, |
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255 |
Klass* sel_klass, |
31019 | 256 |
const fieldDescriptor& fd, TRAPS); |
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257 |
static void check_method_accessability(Klass* ref_klass, |
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258 |
Klass* resolved_klass, |
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259 |
Klass* sel_klass, |
31019 | 260 |
const methodHandle& sel_method, TRAPS); |
1 | 261 |
|
31019 | 262 |
// runtime resolving from constant pool |
263 |
static void resolve_invokestatic (CallInfo& result, |
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const constantPoolHandle& pool, int index, TRAPS); |
44738 | 265 |
static void resolve_invokespecial (CallInfo& result, Handle recv, |
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266 |
const constantPoolHandle& pool, int index, TRAPS); |
31019 | 267 |
static void resolve_invokevirtual (CallInfo& result, Handle recv, |
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268 |
const constantPoolHandle& pool, int index, TRAPS); |
31019 | 269 |
static void resolve_invokeinterface(CallInfo& result, Handle recv, |
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270 |
const constantPoolHandle& pool, int index, TRAPS); |
31019 | 271 |
static void resolve_invokedynamic (CallInfo& result, |
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272 |
const constantPoolHandle& pool, int index, TRAPS); |
31019 | 273 |
static void resolve_invokehandle (CallInfo& result, |
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274 |
const constantPoolHandle& pool, int index, TRAPS); |
1 | 275 |
public: |
276 |
// constant pool resolving |
|
48826 | 277 |
static void check_klass_accessability(Klass* ref_klass, Klass* sel_klass, |
278 |
bool fold_type_to_class, TRAPS); |
|
279 |
// The optional 'fold_type_to_class' means that a derived type (array) |
|
280 |
// is first converted to the class it is derived from (element type). |
|
281 |
// If this element type is not a class, then the check passes quietly. |
|
282 |
// This is usually what is needed, but a few existing uses might break |
|
283 |
// if this flag were always turned on. FIXME: See if it can be, always. |
|
284 |
static void check_klass_accessability(Klass* ref_klass, Klass* sel_klass, TRAPS) { |
|
285 |
return check_klass_accessability(ref_klass, sel_klass, false, THREAD); |
|
286 |
} |
|
1 | 287 |
|
31019 | 288 |
// static resolving calls (will not run any Java code); |
289 |
// used only from Bytecode_invoke::static_target |
|
290 |
static methodHandle resolve_method_statically(Bytecodes::Code code, |
|
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|
291 |
const constantPoolHandle& pool, |
31019 | 292 |
int index, TRAPS); |
1 | 293 |
|
31019 | 294 |
static void resolve_field_access(fieldDescriptor& result, |
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295 |
const constantPoolHandle& pool, |
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|
296 |
int index, |
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|
297 |
const methodHandle& method, |
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|
298 |
Bytecodes::Code byte, TRAPS); |
31019 | 299 |
static void resolve_field(fieldDescriptor& result, const LinkInfo& link_info, |
300 |
Bytecodes::Code access_kind, |
|
301 |
bool initialize_class, TRAPS); |
|
1 | 302 |
|
31019 | 303 |
static void resolve_static_call (CallInfo& result, |
304 |
const LinkInfo& link_info, |
|
305 |
bool initialize_klass, TRAPS); |
|
306 |
static void resolve_special_call (CallInfo& result, |
|
44738 | 307 |
Handle recv, |
31019 | 308 |
const LinkInfo& link_info, |
309 |
TRAPS); |
|
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|
310 |
static void resolve_virtual_call (CallInfo& result, Handle recv, Klass* recv_klass, |
31019 | 311 |
const LinkInfo& link_info, |
312 |
bool check_null_and_abstract, TRAPS); |
|
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|
313 |
static void resolve_interface_call(CallInfo& result, Handle recv, Klass* recv_klass, |
31019 | 314 |
const LinkInfo& link_info, |
315 |
bool check_null_and_abstract, TRAPS); |
|
316 |
static void resolve_handle_call (CallInfo& result, |
|
317 |
const LinkInfo& link_info, TRAPS); |
|
48826 | 318 |
static void resolve_dynamic_call (CallInfo& result, int pool_index, Handle bootstrap_specifier, |
31019 | 319 |
Symbol* method_name, Symbol* method_signature, |
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|
320 |
Klass* current_klass, TRAPS); |
1 | 321 |
|
31019 | 322 |
// same as above for compile-time resolution; but returns null handle instead of throwing |
323 |
// an exception on error also, does not initialize klass (i.e., no side effects) |
|
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|
324 |
static methodHandle resolve_virtual_call_or_null (Klass* receiver_klass, |
31019 | 325 |
const LinkInfo& link_info); |
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|
326 |
static methodHandle resolve_interface_call_or_null(Klass* receiver_klass, |
31019 | 327 |
const LinkInfo& link_info); |
328 |
static methodHandle resolve_static_call_or_null (const LinkInfo& link_info); |
|
329 |
static methodHandle resolve_special_call_or_null (const LinkInfo& link_info); |
|
330 |
||
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|
331 |
static int vtable_index_of_interface_method(Klass* klass, const methodHandle& resolved_method); |
1 | 332 |
|
333 |
// same as above for compile-time resolution; returns vtable_index if current_klass if linked |
|
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|
334 |
static int resolve_virtual_vtable_index (Klass* receiver_klass, |
31019 | 335 |
const LinkInfo& link_info); |
1 | 336 |
|
337 |
// static resolving for compiler (does not throw exceptions, returns null handle if unsuccessful) |
|
31019 | 338 |
static methodHandle linktime_resolve_virtual_method_or_null (const LinkInfo& link_info); |
339 |
static methodHandle linktime_resolve_interface_method_or_null(const LinkInfo& link_info); |
|
1 | 340 |
|
341 |
// runtime resolving from constant pool |
|
31019 | 342 |
static void resolve_invoke(CallInfo& result, Handle recv, |
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|
343 |
const constantPoolHandle& pool, int index, |
31019 | 344 |
Bytecodes::Code byte, TRAPS); |
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|
345 |
|
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|
346 |
// runtime resolving from attached method |
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|
347 |
static void resolve_invoke(CallInfo& result, Handle& recv, |
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348 |
const methodHandle& attached_method, |
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|
349 |
Bytecodes::Code byte, TRAPS); |
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|
350 |
|
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|
351 |
public: |
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|
352 |
// Only resolved method known. |
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|
353 |
static void throw_abstract_method_error(const methodHandle& resolved_method, TRAPS) { |
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|
354 |
throw_abstract_method_error(resolved_method, NULL, NULL, CHECK); |
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|
355 |
} |
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|
356 |
// Resolved method and receiver klass know. |
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|
357 |
static void throw_abstract_method_error(const methodHandle& resolved_method, Klass *recv_klass, TRAPS) { |
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|
358 |
throw_abstract_method_error(resolved_method, NULL, recv_klass, CHECK); |
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|
359 |
} |
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|
360 |
// Selected method is abstract. |
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|
361 |
static void throw_abstract_method_error(const methodHandle& resolved_method, |
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|
362 |
const methodHandle& selected_method, |
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|
363 |
Klass *recv_klass, TRAPS); |
1 | 364 |
}; |
7397 | 365 |
#endif // SHARE_VM_INTERPRETER_LINKRESOLVER_HPP |