author | alanb |
Thu, 01 Dec 2016 08:56:41 +0000 | |
changeset 42307 | cefc81dc1d52 |
parent 40633 | c33ad2ff51de |
child 46329 | 53ccc37bda19 |
permissions | -rw-r--r-- |
1 | 1 |
/* |
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* Copyright (c) 1997, 2016, 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_OOPS_KLASSVTABLE_HPP |
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#define SHARE_VM_OOPS_KLASSVTABLE_HPP |
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#include "memory/allocation.hpp" |
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#include "oops/oopsHierarchy.hpp" |
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#include "runtime/handles.hpp" |
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#include "utilities/growableArray.hpp" |
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// A klassVtable abstracts the variable-length vtable that is embedded in InstanceKlass |
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// and ArrayKlass. klassVtable objects are used just as convenient transient accessors to the vtable, |
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// not to actually hold the vtable data. |
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// Note: the klassVtable should not be accessed before the class has been verified |
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// (until that point, the vtable is uninitialized). |
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// Currently a klassVtable contains a direct reference to the vtable data, and is therefore |
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// not preserved across GCs. |
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class vtableEntry; |
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class klassVtable : public ResourceObj { |
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KlassHandle _klass; // my klass |
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int _tableOffset; // offset of start of vtable data within klass |
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int _length; // length of vtable (number of entries) |
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#ifndef PRODUCT |
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int _verify_count; // to make verify faster |
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#endif |
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// Ordering important, so greater_than (>) can be used as an merge operator. |
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enum AccessType { |
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acc_private = 0, |
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acc_package_private = 1, |
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acc_publicprotected = 2 |
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}; |
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public: |
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klassVtable(KlassHandle h_klass, void* base, int length) : _klass(h_klass) { |
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_tableOffset = (address)base - (address)h_klass(); _length = length; |
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} |
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// accessors |
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vtableEntry* table() const { return (vtableEntry*)(address(_klass()) + _tableOffset); } |
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KlassHandle klass() const { return _klass; } |
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int length() const { return _length; } |
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inline Method* method_at(int i) const; |
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inline Method* unchecked_method_at(int i) const; |
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inline Method** adr_method_at(int i) const; |
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// searching; all methods return -1 if not found |
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int index_of(Method* m) const { return index_of(m, _length); } |
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int index_of_miranda(Symbol* name, Symbol* signature); |
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void initialize_vtable(bool checkconstraints, TRAPS); // initialize vtable of a new klass |
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// CDS/RedefineClasses support - clear vtables so they can be reinitialized |
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// at dump time. Clearing gives us an easy way to tell if the vtable has |
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// already been reinitialized at dump time (see dump.cpp). Vtables can |
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// be initialized at run time by RedefineClasses so dumping the right order |
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// is necessary. |
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void clear_vtable(); |
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bool is_initialized(); |
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// computes vtable length (in words) and the number of miranda methods |
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static void compute_vtable_size_and_num_mirandas(int* vtable_length, |
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int* num_new_mirandas, |
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GrowableArray<Method*>* all_mirandas, |
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const Klass* super, |
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Array<Method*>* methods, |
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AccessFlags class_flags, |
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u2 major_version, |
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Handle classloader, |
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Symbol* classname, |
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Array<Klass*>* local_interfaces, |
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TRAPS); |
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#if INCLUDE_JVMTI |
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// RedefineClasses() API support: |
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// If any entry of this vtable points to any of old_methods, |
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// replace it with the corresponding new_method. |
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// trace_name_printed is set to true if the current call has |
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// printed the klass name so that other routines in the adjust_* |
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// group don't print the klass name. |
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bool adjust_default_method(int vtable_index, Method* old_method, Method* new_method); |
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void adjust_method_entries(InstanceKlass* holder, bool * trace_name_printed); |
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bool check_no_old_or_obsolete_entries(); |
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void dump_vtable(); |
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#endif // INCLUDE_JVMTI |
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// Debugging code |
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void print() PRODUCT_RETURN; |
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void verify(outputStream* st, bool force = false); |
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static void print_statistics() PRODUCT_RETURN; |
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protected: |
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friend class vtableEntry; |
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public: |
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// Transitive overridng rules for class files < JDK1_7 use the older JVMS rules. |
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// Overriding is determined as we create the vtable, so we use the class file version |
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// of the class whose vtable we are calculating. |
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enum { VTABLE_TRANSITIVE_OVERRIDE_VERSION = 51 } ; |
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private: |
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void copy_vtable_to(vtableEntry* start); |
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int initialize_from_super(KlassHandle super); |
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int index_of(Method* m, int len) const; // same as index_of, but search only up to len |
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void put_method_at(Method* m, int index); |
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static bool needs_new_vtable_entry(methodHandle m, |
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const Klass* super, |
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Handle classloader, |
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Symbol* classname, |
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AccessFlags access_flags, |
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u2 major_version, |
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TRAPS); |
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bool update_inherited_vtable(InstanceKlass* klass, methodHandle target_method, int super_vtable_len, int default_index, bool checkconstraints, TRAPS); |
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InstanceKlass* find_transitive_override(InstanceKlass* initialsuper, methodHandle target_method, int vtable_index, |
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Handle target_loader, Symbol* target_classname, Thread* THREAD); |
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// support for miranda methods |
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bool is_miranda_entry_at(int i); |
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int fill_in_mirandas(int initialized); |
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static bool is_miranda(Method* m, Array<Method*>* class_methods, |
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Array<Method*>* default_methods, const Klass* super); |
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static void add_new_mirandas_to_lists( |
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GrowableArray<Method*>* new_mirandas, |
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GrowableArray<Method*>* all_mirandas, |
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Array<Method*>* current_interface_methods, |
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Array<Method*>* class_methods, |
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Array<Method*>* default_methods, |
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const Klass* super); |
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static void get_mirandas( |
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GrowableArray<Method*>* new_mirandas, |
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GrowableArray<Method*>* all_mirandas, |
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const Klass* super, |
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Array<Method*>* class_methods, |
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Array<Method*>* default_methods, |
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Array<Klass*>* local_interfaces); |
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void verify_against(outputStream* st, klassVtable* vt, int index); |
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inline InstanceKlass* ik() const; |
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// When loading a class from CDS archive at run time, and no class redefintion |
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// has happened, it is expected that the class's itable/vtables are |
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// laid out exactly the same way as they had been during dump time. |
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// Therefore, in klassVtable::initialize_[iv]table, we do not layout the |
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// tables again. Instead, we only rerun the process to create/check |
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// the class loader constraints. In non-product builds, we add asserts to |
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// guarantee that the table's layout would be the same as at dump time. |
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// |
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// If JVMTI redefines any class, the read-only shared memory are remapped |
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// as read-write. A shared class' vtable/itable are re-initialized and |
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// might have different layout due to class redefinition of the shared class |
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// or its super types. |
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bool is_preinitialized_vtable(); |
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}; |
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// private helper class for klassVtable |
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// description of entry points: |
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// destination is interpreted: |
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// from_compiled_code_entry_point -> c2iadapter |
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// from_interpreter_entry_point -> interpreter entry point |
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// destination is compiled: |
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// from_compiled_code_entry_point -> nmethod entry point |
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// from_interpreter_entry_point -> i2cadapter |
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class vtableEntry VALUE_OBJ_CLASS_SPEC { |
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friend class VMStructs; |
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friend class JVMCIVMStructs; |
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public: |
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// size in words |
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static int size() { return sizeof(vtableEntry) / wordSize; } |
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static int size_in_bytes() { return sizeof(vtableEntry); } |
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static int method_offset_in_bytes() { return offset_of(vtableEntry, _method); } |
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Method* method() const { return _method; } |
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private: |
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Method* _method; |
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void set(Method* method) { assert(method != NULL, "use clear"); _method = method; } |
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void clear() { _method = NULL; } |
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void print() PRODUCT_RETURN; |
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void verify(klassVtable* vt, outputStream* st); |
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206 |
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friend class klassVtable; |
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}; |
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inline Method* klassVtable::method_at(int i) const { |
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assert(i >= 0 && i < _length, "index out of bounds"); |
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assert(table()[i].method() != NULL, "should not be null"); |
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assert(((Metadata*)table()[i].method())->is_method(), "should be method"); |
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return table()[i].method(); |
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} |
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inline Method* klassVtable::unchecked_method_at(int i) const { |
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assert(i >= 0 && i < _length, "index out of bounds"); |
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return table()[i].method(); |
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} |
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inline Method** klassVtable::adr_method_at(int i) const { |
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// Allow one past the last entry to be referenced; useful for loop bounds. |
225 |
assert(i >= 0 && i <= _length, "index out of bounds"); |
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return (Method**)(address(table() + i) + vtableEntry::method_offset_in_bytes()); |
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} |
228 |
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// -------------------------------------------------------------------------------- |
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230 |
class klassItable; |
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231 |
class itableMethodEntry; |
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232 |
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233 |
class itableOffsetEntry VALUE_OBJ_CLASS_SPEC { |
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private: |
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Klass* _interface; |
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int _offset; |
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public: |
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Klass* interface_klass() const { return _interface; } |
1 | 239 |
int offset() const { return _offset; } |
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static itableMethodEntry* method_entry(Klass* k, int offset) { return (itableMethodEntry*)(((address)k) + offset); } |
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itableMethodEntry* first_method_entry(Klass* k) { return method_entry(k, _offset); } |
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void initialize(Klass* interf, int offset) { _interface = interf; _offset = offset; } |
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// Static size and offset accessors |
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static int size() { return sizeof(itableOffsetEntry) / wordSize; } // size in words |
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static int interface_offset_in_bytes() { return offset_of(itableOffsetEntry, _interface); } |
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static int offset_offset_in_bytes() { return offset_of(itableOffsetEntry, _offset); } |
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friend class klassItable; |
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}; |
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class itableMethodEntry VALUE_OBJ_CLASS_SPEC { |
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private: |
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Method* _method; |
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public: |
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Method* method() const { return _method; } |
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void clear() { _method = NULL; } |
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void initialize(Method* method); |
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// Static size and offset accessors |
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static int size() { return sizeof(itableMethodEntry) / wordSize; } // size in words |
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static int method_offset_in_bytes() { return offset_of(itableMethodEntry, _method); } |
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friend class klassItable; |
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}; |
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// |
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// Format of an itable |
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// |
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// ---- offset table --- |
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// Klass* of interface 1 \ |
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// offset to vtable from start of oop / offset table entry |
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// ... |
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// Klass* of interface n \ |
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// offset to vtable from start of oop / offset table entry |
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// --- vtable for interface 1 --- |
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// Method* \ |
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// compiler entry point / method table entry |
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// ... |
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// Method* \ |
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// compiler entry point / method table entry |
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// -- vtable for interface 2 --- |
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// ... |
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// |
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class klassItable : public ResourceObj { |
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private: |
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instanceKlassHandle _klass; // my klass |
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int _table_offset; // offset of start of itable data within klass (in words) |
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int _size_offset_table; // size of offset table (in itableOffset entries) |
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int _size_method_table; // size of methodtable (in itableMethodEntry entries) |
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void initialize_itable_for_interface(int method_table_offset, KlassHandle interf_h, bool checkconstraints, TRAPS); |
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public: |
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klassItable(instanceKlassHandle klass); |
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itableOffsetEntry* offset_entry(int i) { assert(0 <= i && i <= _size_offset_table, "index out of bounds"); |
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return &((itableOffsetEntry*)vtable_start())[i]; } |
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itableMethodEntry* method_entry(int i) { assert(0 <= i && i <= _size_method_table, "index out of bounds"); |
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return &((itableMethodEntry*)method_start())[i]; } |
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int size_offset_table() { return _size_offset_table; } |
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// Initialization |
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void initialize_itable(bool checkconstraints, TRAPS); |
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// Updates |
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void initialize_with_method(Method* m); |
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#if INCLUDE_JVMTI |
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// RedefineClasses() API support: |
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// if any entry of this itable points to any of old_methods, |
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// replace it with the corresponding new_method. |
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// trace_name_printed is set to true if the current call has |
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// printed the klass name so that other routines in the adjust_* |
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// group don't print the klass name. |
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void adjust_method_entries(InstanceKlass* holder, bool * trace_name_printed); |
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bool check_no_old_or_obsolete_entries(); |
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void dump_itable(); |
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#endif // INCLUDE_JVMTI |
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// Setup of itable |
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static int assign_itable_indices_for_interface(Klass* klass); |
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static int method_count_for_interface(Klass* klass); |
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static int compute_itable_size(Array<Klass*>* transitive_interfaces); |
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static void setup_itable_offset_table(instanceKlassHandle klass); |
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// Resolving of method to index |
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static Method* method_for_itable_index(Klass* klass, int itable_index); |
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// Debugging/Statistics |
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static void print_statistics() PRODUCT_RETURN; |
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private: |
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intptr_t* vtable_start() const { return ((intptr_t*)_klass()) + _table_offset; } |
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intptr_t* method_start() const { return vtable_start() + _size_offset_table * itableOffsetEntry::size(); } |
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// Helper methods |
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static int calc_itable_size(int num_interfaces, int num_methods) { return (num_interfaces * itableOffsetEntry::size()) + (num_methods * itableMethodEntry::size()); } |
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// Statistics |
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NOT_PRODUCT(static int _total_classes;) // Total no. of classes with itables |
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NOT_PRODUCT(static long _total_size;) // Total no. of bytes used for itables |
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static void update_stats(int size) PRODUCT_RETURN NOT_PRODUCT({ _total_classes++; _total_size += size; }) |
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}; |
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#endif // SHARE_VM_OOPS_KLASSVTABLE_HPP |