25 #ifndef SHARE_VM_OOPS_KLASSVTABLE_HPP
26 #define SHARE_VM_OOPS_KLASSVTABLE_HPP
27
28 #include "memory/allocation.hpp"
29 #include "oops/oopsHierarchy.hpp"
30 #include "runtime/handles.hpp"
31 #include "utilities/growableArray.hpp"
32
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).
38
39 // Currently a klassVtable contains a direct reference to the vtable data, and is therefore
40 // not preserved across GCs.
41
42 class vtableEntry;
43
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
51
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 };
58
59 public:
60 klassVtable(KlassHandle h_klass, void* base, int length) : _klass(h_klass) {
61 _tableOffset = (address)base - (address)h_klass(); _length = length;
62 }
63
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;
71
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);
75
76 void initialize_vtable(bool checkconstraints, TRAPS); // initialize vtable of a new klass
77
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();
85
86 // computes vtable length (in words) and the number of miranda methods
108 bool check_no_old_or_obsolete_entries();
109 void dump_vtable();
110 #endif // INCLUDE_JVMTI
111
112 // Debugging code
113 void print() PRODUCT_RETURN;
114 void verify(outputStream* st, bool force = false);
115 static void print_statistics() PRODUCT_RETURN;
116
117 protected:
118 friend class vtableEntry;
119
120 public:
121 // Transitive overridng rules for class files < JDK1_7 use the older JVMS rules.
122 // Overriding is determined as we create the vtable, so we use the class file version
123 // of the class whose vtable we are calculating.
124 enum { VTABLE_TRANSITIVE_OVERRIDE_VERSION = 51 } ;
125
126 private:
127 void copy_vtable_to(vtableEntry* start);
128 int initialize_from_super(KlassHandle super);
129 int index_of(Method* m, int len) const; // same as index_of, but search only up to len
130 void put_method_at(Method* m, int index);
131 static bool needs_new_vtable_entry(methodHandle m,
132 const Klass* super,
133 Handle classloader,
134 Symbol* classname,
135 AccessFlags access_flags,
136 u2 major_version,
137 TRAPS);
138
139 bool update_inherited_vtable(InstanceKlass* klass, methodHandle target_method, int super_vtable_len, int default_index, bool checkconstraints, TRAPS);
140 InstanceKlass* find_transitive_override(InstanceKlass* initialsuper, methodHandle target_method, int vtable_index,
141 Handle target_loader, Symbol* target_classname, Thread* THREAD);
142
143 // support for miranda methods
144 bool is_miranda_entry_at(int i);
145 int fill_in_mirandas(int initialized);
146 static bool is_miranda(Method* m, Array<Method*>* class_methods,
147 Array<Method*>* default_methods, const Klass* super);
148 static void add_new_mirandas_to_lists(
273 //
274 // Format of an itable
275 //
276 // ---- offset table ---
277 // Klass* of interface 1 \
278 // offset to vtable from start of oop / offset table entry
279 // ...
280 // Klass* of interface n \
281 // offset to vtable from start of oop / offset table entry
282 // --- vtable for interface 1 ---
283 // Method* \
284 // compiler entry point / method table entry
285 // ...
286 // Method* \
287 // compiler entry point / method table entry
288 // -- vtable for interface 2 ---
289 // ...
290 //
291 class klassItable : public ResourceObj {
292 private:
293 instanceKlassHandle _klass; // my klass
294 int _table_offset; // offset of start of itable data within klass (in words)
295 int _size_offset_table; // size of offset table (in itableOffset entries)
296 int _size_method_table; // size of methodtable (in itableMethodEntry entries)
297
298 void initialize_itable_for_interface(int method_table_offset, KlassHandle interf_h, bool checkconstraints, TRAPS);
299 public:
300 klassItable(instanceKlassHandle klass);
301
302 itableOffsetEntry* offset_entry(int i) { assert(0 <= i && i <= _size_offset_table, "index out of bounds");
303 return &((itableOffsetEntry*)vtable_start())[i]; }
304
305 itableMethodEntry* method_entry(int i) { assert(0 <= i && i <= _size_method_table, "index out of bounds");
306 return &((itableMethodEntry*)method_start())[i]; }
307
308 int size_offset_table() { return _size_offset_table; }
309
310 // Initialization
311 void initialize_itable(bool checkconstraints, TRAPS);
312
313 // Updates
314 void initialize_with_method(Method* m);
315
316 #if INCLUDE_JVMTI
317 // RedefineClasses() API support:
318 // if any entry of this itable points to any of old_methods,
319 // replace it with the corresponding new_method.
320 // trace_name_printed is set to true if the current call has
321 // printed the klass name so that other routines in the adjust_*
322 // group don't print the klass name.
323 void adjust_method_entries(InstanceKlass* holder, bool * trace_name_printed);
324 bool check_no_old_or_obsolete_entries();
325 void dump_itable();
326 #endif // INCLUDE_JVMTI
327
328 // Setup of itable
329 static int assign_itable_indices_for_interface(Klass* klass);
330 static int method_count_for_interface(Klass* klass);
331 static int compute_itable_size(Array<Klass*>* transitive_interfaces);
332 static void setup_itable_offset_table(instanceKlassHandle klass);
333
334 // Resolving of method to index
335 static Method* method_for_itable_index(Klass* klass, int itable_index);
336
337 // Debugging/Statistics
338 static void print_statistics() PRODUCT_RETURN;
339 private:
340 intptr_t* vtable_start() const { return ((intptr_t*)_klass()) + _table_offset; }
341 intptr_t* method_start() const { return vtable_start() + _size_offset_table * itableOffsetEntry::size(); }
342
343 // Helper methods
344 static int calc_itable_size(int num_interfaces, int num_methods) { return (num_interfaces * itableOffsetEntry::size()) + (num_methods * itableMethodEntry::size()); }
345
346 // Statistics
347 NOT_PRODUCT(static int _total_classes;) // Total no. of classes with itables
348 NOT_PRODUCT(static long _total_size;) // Total no. of bytes used for itables
349
350 static void update_stats(int size) PRODUCT_RETURN NOT_PRODUCT({ _total_classes++; _total_size += size; })
351 };
352
353 #endif // SHARE_VM_OOPS_KLASSVTABLE_HPP
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25 #ifndef SHARE_VM_OOPS_KLASSVTABLE_HPP
26 #define SHARE_VM_OOPS_KLASSVTABLE_HPP
27
28 #include "memory/allocation.hpp"
29 #include "oops/oopsHierarchy.hpp"
30 #include "runtime/handles.hpp"
31 #include "utilities/growableArray.hpp"
32
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).
38
39 // Currently a klassVtable contains a direct reference to the vtable data, and is therefore
40 // not preserved across GCs.
41
42 class vtableEntry;
43
44 class klassVtable : public ResourceObj {
45 Klass* _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
51
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 };
58
59 public:
60 klassVtable(Klass* klass, void* base, int length) : _klass(klass) {
61 _tableOffset = (address)base - (address)klass; _length = length;
62 }
63
64 // accessors
65 vtableEntry* table() const { return (vtableEntry*)(address(_klass) + _tableOffset); }
66 Klass* 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;
71
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);
75
76 void initialize_vtable(bool checkconstraints, TRAPS); // initialize vtable of a new klass
77
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();
85
86 // computes vtable length (in words) and the number of miranda methods
108 bool check_no_old_or_obsolete_entries();
109 void dump_vtable();
110 #endif // INCLUDE_JVMTI
111
112 // Debugging code
113 void print() PRODUCT_RETURN;
114 void verify(outputStream* st, bool force = false);
115 static void print_statistics() PRODUCT_RETURN;
116
117 protected:
118 friend class vtableEntry;
119
120 public:
121 // Transitive overridng rules for class files < JDK1_7 use the older JVMS rules.
122 // Overriding is determined as we create the vtable, so we use the class file version
123 // of the class whose vtable we are calculating.
124 enum { VTABLE_TRANSITIVE_OVERRIDE_VERSION = 51 } ;
125
126 private:
127 void copy_vtable_to(vtableEntry* start);
128 int initialize_from_super(Klass* super);
129 int index_of(Method* m, int len) const; // same as index_of, but search only up to len
130 void put_method_at(Method* m, int index);
131 static bool needs_new_vtable_entry(methodHandle m,
132 const Klass* super,
133 Handle classloader,
134 Symbol* classname,
135 AccessFlags access_flags,
136 u2 major_version,
137 TRAPS);
138
139 bool update_inherited_vtable(InstanceKlass* klass, methodHandle target_method, int super_vtable_len, int default_index, bool checkconstraints, TRAPS);
140 InstanceKlass* find_transitive_override(InstanceKlass* initialsuper, methodHandle target_method, int vtable_index,
141 Handle target_loader, Symbol* target_classname, Thread* THREAD);
142
143 // support for miranda methods
144 bool is_miranda_entry_at(int i);
145 int fill_in_mirandas(int initialized);
146 static bool is_miranda(Method* m, Array<Method*>* class_methods,
147 Array<Method*>* default_methods, const Klass* super);
148 static void add_new_mirandas_to_lists(
273 //
274 // Format of an itable
275 //
276 // ---- offset table ---
277 // Klass* of interface 1 \
278 // offset to vtable from start of oop / offset table entry
279 // ...
280 // Klass* of interface n \
281 // offset to vtable from start of oop / offset table entry
282 // --- vtable for interface 1 ---
283 // Method* \
284 // compiler entry point / method table entry
285 // ...
286 // Method* \
287 // compiler entry point / method table entry
288 // -- vtable for interface 2 ---
289 // ...
290 //
291 class klassItable : public ResourceObj {
292 private:
293 InstanceKlass* _klass; // my klass
294 int _table_offset; // offset of start of itable data within klass (in words)
295 int _size_offset_table; // size of offset table (in itableOffset entries)
296 int _size_method_table; // size of methodtable (in itableMethodEntry entries)
297
298 void initialize_itable_for_interface(int method_table_offset, Klass* interf_h, bool checkconstraints, TRAPS);
299 public:
300 klassItable(InstanceKlass* klass);
301
302 itableOffsetEntry* offset_entry(int i) { assert(0 <= i && i <= _size_offset_table, "index out of bounds");
303 return &((itableOffsetEntry*)vtable_start())[i]; }
304
305 itableMethodEntry* method_entry(int i) { assert(0 <= i && i <= _size_method_table, "index out of bounds");
306 return &((itableMethodEntry*)method_start())[i]; }
307
308 int size_offset_table() { return _size_offset_table; }
309
310 // Initialization
311 void initialize_itable(bool checkconstraints, TRAPS);
312
313 // Updates
314 void initialize_with_method(Method* m);
315
316 #if INCLUDE_JVMTI
317 // RedefineClasses() API support:
318 // if any entry of this itable points to any of old_methods,
319 // replace it with the corresponding new_method.
320 // trace_name_printed is set to true if the current call has
321 // printed the klass name so that other routines in the adjust_*
322 // group don't print the klass name.
323 void adjust_method_entries(InstanceKlass* holder, bool * trace_name_printed);
324 bool check_no_old_or_obsolete_entries();
325 void dump_itable();
326 #endif // INCLUDE_JVMTI
327
328 // Setup of itable
329 static int assign_itable_indices_for_interface(Klass* klass);
330 static int method_count_for_interface(Klass* klass);
331 static int compute_itable_size(Array<Klass*>* transitive_interfaces);
332 static void setup_itable_offset_table(InstanceKlass* klass);
333
334 // Resolving of method to index
335 static Method* method_for_itable_index(Klass* klass, int itable_index);
336
337 // Debugging/Statistics
338 static void print_statistics() PRODUCT_RETURN;
339 private:
340 intptr_t* vtable_start() const { return ((intptr_t*)_klass) + _table_offset; }
341 intptr_t* method_start() const { return vtable_start() + _size_offset_table * itableOffsetEntry::size(); }
342
343 // Helper methods
344 static int calc_itable_size(int num_interfaces, int num_methods) { return (num_interfaces * itableOffsetEntry::size()) + (num_methods * itableMethodEntry::size()); }
345
346 // Statistics
347 NOT_PRODUCT(static int _total_classes;) // Total no. of classes with itables
348 NOT_PRODUCT(static long _total_size;) // Total no. of bytes used for itables
349
350 static void update_stats(int size) PRODUCT_RETURN NOT_PRODUCT({ _total_classes++; _total_size += size; })
351 };
352
353 #endif // SHARE_VM_OOPS_KLASSVTABLE_HPP
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