Fri, 13 Sep 2013 22:38:02 -0400
8014013: CallInfo structure no longer accurately reports the result of a LinkResolver operation
Summary: Enhance method resolution and resulting data structures, plus some refactoring.
Reviewed-by: twisti, acorn, jrose
1 /*
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25 #ifndef SHARE_VM_OOPS_KLASSVTABLE_HPP
26 #define SHARE_VM_OOPS_KLASSVTABLE_HPP
28 #include "memory/allocation.hpp"
29 #include "oops/oopsHierarchy.hpp"
30 #include "runtime/handles.hpp"
31 #include "utilities/growableArray.hpp"
33 // A klassVtable abstracts the variable-length vtable that is embedded in InstanceKlass
34 // and ArrayKlass. klassVtable objects are used just as convenient transient accessors to the vtable,
35 // not to actually hold the vtable data.
36 // Note: the klassVtable should not be accessed before the class has been verified
37 // (until that point, the vtable is uninitialized).
39 // Currently a klassVtable contains a direct reference to the vtable data, and is therefore
40 // not preserved across GCs.
42 class vtableEntry;
44 class klassVtable : public ResourceObj {
45 KlassHandle _klass; // my klass
46 int _tableOffset; // offset of start of vtable data within klass
47 int _length; // length of vtable (number of entries)
48 #ifndef PRODUCT
49 int _verify_count; // to make verify faster
50 #endif
52 // Ordering important, so greater_than (>) can be used as an merge operator.
53 enum AccessType {
54 acc_private = 0,
55 acc_package_private = 1,
56 acc_publicprotected = 2
57 };
59 public:
60 klassVtable(KlassHandle h_klass, void* base, int length) : _klass(h_klass) {
61 _tableOffset = (address)base - (address)h_klass(); _length = length;
62 }
64 // accessors
65 vtableEntry* table() const { return (vtableEntry*)(address(_klass()) + _tableOffset); }
66 KlassHandle klass() const { return _klass; }
67 int length() const { return _length; }
68 inline Method* method_at(int i) const;
69 inline Method* unchecked_method_at(int i) const;
70 inline Method** adr_method_at(int i) const;
72 // searching; all methods return -1 if not found
73 int index_of(Method* m) const { return index_of(m, _length); }
74 int index_of_miranda(Symbol* name, Symbol* signature);
76 void initialize_vtable(bool checkconstraints, TRAPS); // initialize vtable of a new klass
78 // CDS/RedefineClasses support - clear vtables so they can be reinitialized
79 // at dump time. Clearing gives us an easy way to tell if the vtable has
80 // already been reinitialized at dump time (see dump.cpp). Vtables can
81 // be initialized at run time by RedefineClasses so dumping the right order
82 // is necessary.
83 void clear_vtable();
84 bool is_initialized();
86 // computes vtable length (in words) and the number of miranda methods
87 static void compute_vtable_size_and_num_mirandas(
88 int* vtable_length, int* num_new_mirandas,
89 GrowableArray<Method*>* all_mirandas, Klass* super,
90 Array<Method*>* methods, AccessFlags class_flags, Handle classloader,
91 Symbol* classname, Array<Klass*>* local_interfaces, TRAPS);
93 #if INCLUDE_JVMTI
94 // RedefineClasses() API support:
95 // If any entry of this vtable points to any of old_methods,
96 // replace it with the corresponding new_method.
97 // trace_name_printed is set to true if the current call has
98 // printed the klass name so that other routines in the adjust_*
99 // group don't print the klass name.
100 void adjust_method_entries(Method** old_methods, Method** new_methods,
101 int methods_length, bool * trace_name_printed);
102 bool check_no_old_or_obsolete_entries();
103 void dump_vtable();
104 #endif // INCLUDE_JVMTI
106 // Debugging code
107 void print() PRODUCT_RETURN;
108 void verify(outputStream* st, bool force = false);
109 static void print_statistics() PRODUCT_RETURN;
111 protected:
112 friend class vtableEntry;
113 private:
114 enum { VTABLE_TRANSITIVE_OVERRIDE_VERSION = 51 } ;
115 void copy_vtable_to(vtableEntry* start);
116 int initialize_from_super(KlassHandle super);
117 int index_of(Method* m, int len) const; // same as index_of, but search only up to len
118 void put_method_at(Method* m, int index);
119 static bool needs_new_vtable_entry(methodHandle m, Klass* super, Handle classloader, Symbol* classname, AccessFlags access_flags, TRAPS);
121 bool update_inherited_vtable(InstanceKlass* klass, methodHandle target_method, int super_vtable_len, bool checkconstraints, TRAPS);
122 InstanceKlass* find_transitive_override(InstanceKlass* initialsuper, methodHandle target_method, int vtable_index,
123 Handle target_loader, Symbol* target_classname, Thread* THREAD);
125 // support for miranda methods
126 bool is_miranda_entry_at(int i);
127 int fill_in_mirandas(int initialized);
128 static bool is_miranda(Method* m, Array<Method*>* class_methods, Klass* super);
129 static void add_new_mirandas_to_lists(
130 GrowableArray<Method*>* new_mirandas,
131 GrowableArray<Method*>* all_mirandas,
132 Array<Method*>* current_interface_methods, Array<Method*>* class_methods,
133 Klass* super);
134 static void get_mirandas(
135 GrowableArray<Method*>* new_mirandas,
136 GrowableArray<Method*>* all_mirandas, Klass* super,
137 Array<Method*>* class_methods, Array<Klass*>* local_interfaces);
139 void verify_against(outputStream* st, klassVtable* vt, int index);
140 inline InstanceKlass* ik() const;
141 };
144 // private helper class for klassVtable
145 // description of entry points:
146 // destination is interpreted:
147 // from_compiled_code_entry_point -> c2iadapter
148 // from_interpreter_entry_point -> interpreter entry point
149 // destination is compiled:
150 // from_compiled_code_entry_point -> nmethod entry point
151 // from_interpreter_entry_point -> i2cadapter
152 class vtableEntry VALUE_OBJ_CLASS_SPEC {
153 friend class VMStructs;
155 public:
156 // size in words
157 static int size() {
158 return sizeof(vtableEntry) / sizeof(HeapWord);
159 }
160 static int method_offset_in_bytes() { return offset_of(vtableEntry, _method); }
161 Method* method() const { return _method; }
163 private:
164 Method* _method;
165 void set(Method* method) { assert(method != NULL, "use clear"); _method = method; }
166 void clear() { _method = NULL; }
167 void print() PRODUCT_RETURN;
168 void verify(klassVtable* vt, outputStream* st);
170 friend class klassVtable;
171 };
174 inline Method* klassVtable::method_at(int i) const {
175 assert(i >= 0 && i < _length, "index out of bounds");
176 assert(table()[i].method() != NULL, "should not be null");
177 assert(((Metadata*)table()[i].method())->is_method(), "should be method");
178 return table()[i].method();
179 }
181 inline Method* klassVtable::unchecked_method_at(int i) const {
182 assert(i >= 0 && i < _length, "index out of bounds");
183 return table()[i].method();
184 }
186 inline Method** klassVtable::adr_method_at(int i) const {
187 // Allow one past the last entry to be referenced; useful for loop bounds.
188 assert(i >= 0 && i <= _length, "index out of bounds");
189 return (Method**)(address(table() + i) + vtableEntry::method_offset_in_bytes());
190 }
192 // --------------------------------------------------------------------------------
193 class klassItable;
194 class itableMethodEntry;
196 class itableOffsetEntry VALUE_OBJ_CLASS_SPEC {
197 private:
198 Klass* _interface;
199 int _offset;
200 public:
201 Klass* interface_klass() const { return _interface; }
202 int offset() const { return _offset; }
204 static itableMethodEntry* method_entry(Klass* k, int offset) { return (itableMethodEntry*)(((address)k) + offset); }
205 itableMethodEntry* first_method_entry(Klass* k) { return method_entry(k, _offset); }
207 void initialize(Klass* interf, int offset) { _interface = interf; _offset = offset; }
209 // Static size and offset accessors
210 static int size() { return sizeof(itableOffsetEntry) / HeapWordSize; } // size in words
211 static int interface_offset_in_bytes() { return offset_of(itableOffsetEntry, _interface); }
212 static int offset_offset_in_bytes() { return offset_of(itableOffsetEntry, _offset); }
214 friend class klassItable;
215 };
218 class itableMethodEntry VALUE_OBJ_CLASS_SPEC {
219 private:
220 Method* _method;
222 public:
223 Method* method() const { return _method; }
225 void clear() { _method = NULL; }
227 void initialize(Method* method);
229 // Static size and offset accessors
230 static int size() { return sizeof(itableMethodEntry) / HeapWordSize; } // size in words
231 static int method_offset_in_bytes() { return offset_of(itableMethodEntry, _method); }
233 friend class klassItable;
234 };
236 //
237 // Format of an itable
238 //
239 // ---- offset table ---
240 // Klass* of interface 1 \
241 // offset to vtable from start of oop / offset table entry
242 // ...
243 // Klass* of interface n \
244 // offset to vtable from start of oop / offset table entry
245 // --- vtable for interface 1 ---
246 // Method* \
247 // compiler entry point / method table entry
248 // ...
249 // Method* \
250 // compiler entry point / method table entry
251 // -- vtable for interface 2 ---
252 // ...
253 //
254 class klassItable : public ResourceObj {
255 private:
256 instanceKlassHandle _klass; // my klass
257 int _table_offset; // offset of start of itable data within klass (in words)
258 int _size_offset_table; // size of offset table (in itableOffset entries)
259 int _size_method_table; // size of methodtable (in itableMethodEntry entries)
261 void initialize_itable_for_interface(int method_table_offset, KlassHandle interf_h, bool checkconstraints, TRAPS);
262 public:
263 klassItable(instanceKlassHandle klass);
265 itableOffsetEntry* offset_entry(int i) { assert(0 <= i && i <= _size_offset_table, "index out of bounds");
266 return &((itableOffsetEntry*)vtable_start())[i]; }
268 itableMethodEntry* method_entry(int i) { assert(0 <= i && i <= _size_method_table, "index out of bounds");
269 return &((itableMethodEntry*)method_start())[i]; }
271 int size_offset_table() { return _size_offset_table; }
273 // Initialization
274 void initialize_itable(bool checkconstraints, TRAPS);
276 // Updates
277 void initialize_with_method(Method* m);
279 #if INCLUDE_JVMTI
280 // RedefineClasses() API support:
281 // if any entry of this itable points to any of old_methods,
282 // replace it with the corresponding new_method.
283 // trace_name_printed is set to true if the current call has
284 // printed the klass name so that other routines in the adjust_*
285 // group don't print the klass name.
286 void adjust_method_entries(Method** old_methods, Method** new_methods,
287 int methods_length, bool * trace_name_printed);
288 bool check_no_old_or_obsolete_entries();
289 void dump_itable();
290 #endif // INCLUDE_JVMTI
292 // Setup of itable
293 static int assign_itable_indexes_for_interface(Klass* klass);
294 static int method_count_for_interface(Klass* klass);
295 static int compute_itable_size(Array<Klass*>* transitive_interfaces);
296 static void setup_itable_offset_table(instanceKlassHandle klass);
298 // Resolving of method to index
299 static Method* method_for_itable_index(Klass* klass, int itable_index);
301 // Debugging/Statistics
302 static void print_statistics() PRODUCT_RETURN;
303 private:
304 intptr_t* vtable_start() const { return ((intptr_t*)_klass()) + _table_offset; }
305 intptr_t* method_start() const { return vtable_start() + _size_offset_table * itableOffsetEntry::size(); }
307 // Helper methods
308 static int calc_itable_size(int num_interfaces, int num_methods) { return (num_interfaces * itableOffsetEntry::size()) + (num_methods * itableMethodEntry::size()); }
310 // Statistics
311 NOT_PRODUCT(static int _total_classes;) // Total no. of classes with itables
312 NOT_PRODUCT(static long _total_size;) // Total no. of bytes used for itables
314 static void update_stats(int size) PRODUCT_RETURN NOT_PRODUCT({ _total_classes++; _total_size += size; })
315 };
317 #endif // SHARE_VM_OOPS_KLASSVTABLE_HPP