97e169ac77
Use align_metadata_size, align_metadata_offset and is_metadata_aligned for metadata rather than align_object_size, etc. Use wordSize rather than HeapWordSize for metadata. Use align_ptr_up rather than align_pointer_up (all the related functions are ptr). Reviewed-by: hseigel, jmasa, cjplummer
333 lines
14 KiB
C++
333 lines
14 KiB
C++
/*
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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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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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private:
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enum { VTABLE_TRANSITIVE_OVERRIDE_VERSION = 51 } ;
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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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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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};
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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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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.
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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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}
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// --------------------------------------------------------------------------------
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class klassItable;
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class itableMethodEntry;
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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; }
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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
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