author | minqi |
Tue, 17 Nov 2015 15:14:29 -0800 | |
changeset 34229 | 892795cc82fe |
parent 33593 | 60764a78fa5c |
child 34238 | 60e87df08f1e |
permissions | -rw-r--r-- |
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/* |
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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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||
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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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|
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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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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, 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, KlassHandle 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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_resolved_klass(resolved_klass), |
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_name(name), _signature(signature), _current_klass(current_klass), |
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_check_access(check_access == needs_access_check && current_klass.not_null()), _tag(tag) {} |
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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(KlassHandle resolved_klass, Symbol*name, Symbol* signature) : |
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_resolved_klass(resolved_klass), |
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_name(name), _signature(signature), _current_klass(NULL), |
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_check_access(false), _tag(JVM_CONSTANT_Invalid) {} |
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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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constantTag tag() const { return _tag; } |
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bool check_access() const { return _check_access; } |
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char* method_string() const; |
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169 |
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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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186 |
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 |
194 |
static methodHandle lookup_instance_method_in_klasses ( |
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195 |
KlassHandle klass, Symbol* name, Symbol* signature, TRAPS); |
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JVMCI_ONLY(private:) |
1 | 197 |
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// Similar loader constraint checking functions that throw |
199 |
// LinkageError with descriptive message. |
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200 |
static void check_method_loader_constraints(const LinkInfo& link_info, |
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201 |
const methodHandle& resolved_method, |
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202 |
const char* method_type, TRAPS); |
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203 |
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); |
208 |
static methodHandle resolve_method (const LinkInfo& link_info, bool require_methodref, TRAPS); |
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1 | 209 |
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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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1 | 214 |
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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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218 |
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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221 |
const methodHandle& resolved_method, |
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222 |
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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228 |
KlassHandle resolved_klass, |
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Handle recv, |
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230 |
KlassHandle recv_klass, |
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bool check_null_and_abstract, TRAPS); |
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1 | 232 |
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static void check_field_accessability(KlassHandle ref_klass, |
234 |
KlassHandle resolved_klass, |
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235 |
KlassHandle sel_klass, |
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const fieldDescriptor& fd, TRAPS); |
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237 |
static void check_method_accessability(KlassHandle ref_klass, |
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238 |
KlassHandle resolved_klass, |
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KlassHandle sel_klass, |
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240 |
const methodHandle& sel_method, TRAPS); |
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1 | 241 |
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// runtime resolving from constant pool |
243 |
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); |
31019 | 253 |
static void resolve_invokehandle (CallInfo& result, |
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const constantPoolHandle& pool, int index, TRAPS); |
1 | 255 |
public: |
256 |
// constant pool resolving |
|
257 |
static void check_klass_accessability(KlassHandle ref_klass, KlassHandle sel_klass, TRAPS); |
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258 |
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31019 | 259 |
// static resolving calls (will not run any Java code); |
260 |
// used only from Bytecode_invoke::static_target |
|
261 |
static methodHandle resolve_method_statically(Bytecodes::Code code, |
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const constantPoolHandle& pool, |
31019 | 263 |
int index, TRAPS); |
1 | 264 |
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31019 | 265 |
static void resolve_field_access(fieldDescriptor& result, |
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const constantPoolHandle& pool, |
31019 | 267 |
int index, Bytecodes::Code byte, TRAPS); |
268 |
static void resolve_field(fieldDescriptor& result, const LinkInfo& link_info, |
|
269 |
Bytecodes::Code access_kind, |
|
270 |
bool initialize_class, TRAPS); |
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1 | 271 |
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31019 | 272 |
static void resolve_static_call (CallInfo& result, |
273 |
const LinkInfo& link_info, |
|
274 |
bool initialize_klass, TRAPS); |
|
275 |
static void resolve_special_call (CallInfo& result, |
|
276 |
const LinkInfo& link_info, |
|
277 |
TRAPS); |
|
278 |
static void resolve_virtual_call (CallInfo& result, Handle recv, KlassHandle recv_klass, |
|
279 |
const LinkInfo& link_info, |
|
280 |
bool check_null_and_abstract, TRAPS); |
|
281 |
static void resolve_interface_call(CallInfo& result, Handle recv, KlassHandle recv_klass, |
|
282 |
const LinkInfo& link_info, |
|
283 |
bool check_null_and_abstract, TRAPS); |
|
284 |
static void resolve_handle_call (CallInfo& result, |
|
285 |
const LinkInfo& link_info, TRAPS); |
|
286 |
static void resolve_dynamic_call (CallInfo& result, Handle bootstrap_specifier, |
|
287 |
Symbol* method_name, Symbol* method_signature, |
|
288 |
KlassHandle current_klass, TRAPS); |
|
1 | 289 |
|
31019 | 290 |
// same as above for compile-time resolution; but returns null handle instead of throwing |
291 |
// an exception on error also, does not initialize klass (i.e., no side effects) |
|
292 |
static methodHandle resolve_virtual_call_or_null (KlassHandle receiver_klass, |
|
293 |
const LinkInfo& link_info); |
|
294 |
static methodHandle resolve_interface_call_or_null(KlassHandle receiver_klass, |
|
295 |
const LinkInfo& link_info); |
|
296 |
static methodHandle resolve_static_call_or_null (const LinkInfo& link_info); |
|
297 |
static methodHandle resolve_special_call_or_null (const LinkInfo& link_info); |
|
298 |
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299 |
static int vtable_index_of_interface_method(KlassHandle klass, const methodHandle& resolved_method); |
|
1 | 300 |
|
301 |
// same as above for compile-time resolution; returns vtable_index if current_klass if linked |
|
31019 | 302 |
static int resolve_virtual_vtable_index (KlassHandle receiver_klass, |
303 |
const LinkInfo& link_info); |
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1 | 304 |
|
305 |
// static resolving for compiler (does not throw exceptions, returns null handle if unsuccessful) |
|
31019 | 306 |
static methodHandle linktime_resolve_virtual_method_or_null (const LinkInfo& link_info); |
307 |
static methodHandle linktime_resolve_interface_method_or_null(const LinkInfo& link_info); |
|
1 | 308 |
|
309 |
// runtime resolving from constant pool |
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31019 | 310 |
static void resolve_invoke(CallInfo& result, Handle recv, |
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const constantPoolHandle& pool, int index, |
31019 | 312 |
Bytecodes::Code byte, TRAPS); |
313 |
private: |
|
314 |
static void trace_method_resolution(const char* prefix, KlassHandle klass, |
|
315 |
KlassHandle resolved_klass, |
|
316 |
const methodHandle& method) PRODUCT_RETURN; |
|
1 | 317 |
}; |
7397 | 318 |
#endif // SHARE_VM_INTERPRETER_LINKRESOLVER_HPP |