Fri, 29 Apr 2016 00:06:10 +0800
Added MIPS 64-bit port.
1 /*
2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
25 /*
26 * This file has been modified by Loongson Technology in 2015. These
27 * modifications are Copyright (c) 2015 Loongson Technology, and are made
28 * available on the same license terms set forth above.
29 */
31 #ifndef SHARE_VM_OOPS_CONSTANTPOOLOOP_HPP
32 #define SHARE_VM_OOPS_CONSTANTPOOLOOP_HPP
34 #include "oops/arrayOop.hpp"
35 #include "oops/cpCache.hpp"
36 #include "oops/objArrayOop.hpp"
37 #include "oops/symbol.hpp"
38 #include "oops/typeArrayOop.hpp"
39 #include "runtime/handles.hpp"
40 #include "utilities/constantTag.hpp"
41 #ifdef TARGET_ARCH_x86
42 # include "bytes_x86.hpp"
43 #endif
44 #ifdef TARGET_ARCH_sparc
45 # include "bytes_sparc.hpp"
46 #endif
47 #ifdef TARGET_ARCH_zero
48 # include "bytes_zero.hpp"
49 #endif
50 #ifdef TARGET_ARCH_arm
51 # include "bytes_arm.hpp"
52 #endif
53 #ifdef TARGET_ARCH_ppc
54 # include "bytes_ppc.hpp"
55 #endif
56 #ifdef TARGET_ARCH_mips
57 # include "bytes_mips.hpp"
58 #endif
61 // A constantPool is an array containing class constants as described in the
62 // class file.
63 //
64 // Most of the constant pool entries are written during class parsing, which
65 // is safe. For klass types, the constant pool entry is
66 // modified when the entry is resolved. If a klass constant pool
67 // entry is read without a lock, only the resolved state guarantees that
68 // the entry in the constant pool is a klass object and not a Symbol*.
70 class SymbolHashMap;
72 class CPSlot VALUE_OBJ_CLASS_SPEC {
73 intptr_t _ptr;
74 public:
75 CPSlot(intptr_t ptr): _ptr(ptr) {}
76 CPSlot(Klass* ptr): _ptr((intptr_t)ptr) {}
77 CPSlot(Symbol* ptr): _ptr((intptr_t)ptr | 1) {}
79 intptr_t value() { return _ptr; }
80 bool is_resolved() { return (_ptr & 1) == 0; }
81 bool is_unresolved() { return (_ptr & 1) == 1; }
83 Symbol* get_symbol() {
84 assert(is_unresolved(), "bad call");
85 return (Symbol*)(_ptr & ~1);
86 }
87 Klass* get_klass() {
88 assert(is_resolved(), "bad call");
89 return (Klass*)_ptr;
90 }
91 };
93 class KlassSizeStats;
94 class ConstantPool : public Metadata {
95 friend class VMStructs;
96 friend class BytecodeInterpreter; // Directly extracts an oop in the pool for fast instanceof/checkcast
97 friend class Universe; // For null constructor
98 private:
99 Array<u1>* _tags; // the tag array describing the constant pool's contents
100 ConstantPoolCache* _cache; // the cache holding interpreter runtime information
101 InstanceKlass* _pool_holder; // the corresponding class
102 Array<u2>* _operands; // for variable-sized (InvokeDynamic) nodes, usually empty
104 // Array of resolved objects from the constant pool and map from resolved
105 // object index to original constant pool index
106 jobject _resolved_references;
107 Array<u2>* _reference_map;
109 enum {
110 _has_preresolution = 1, // Flags
111 _on_stack = 2
112 };
114 int _flags; // old fashioned bit twiddling
115 int _length; // number of elements in the array
117 union {
118 // set for CDS to restore resolved references
119 int _resolved_reference_length;
120 // keeps version number for redefined classes (used in backtrace)
121 int _version;
122 } _saved;
124 Monitor* _lock;
126 void set_tags(Array<u1>* tags) { _tags = tags; }
127 void tag_at_put(int which, jbyte t) { tags()->at_put(which, t); }
128 void release_tag_at_put(int which, jbyte t) { tags()->release_at_put(which, t); }
130 void set_operands(Array<u2>* operands) { _operands = operands; }
132 int flags() const { return _flags; }
133 void set_flags(int f) { _flags = f; }
135 private:
136 intptr_t* base() const { return (intptr_t*) (((char*) this) + sizeof(ConstantPool)); }
138 CPSlot slot_at(int which) {
139 assert(is_within_bounds(which), "index out of bounds");
140 // Uses volatile because the klass slot changes without a lock.
141 volatile intptr_t adr = (intptr_t)OrderAccess::load_ptr_acquire(obj_at_addr_raw(which));
142 assert(adr != 0 || which == 0, "cp entry for klass should not be zero");
143 return CPSlot(adr);
144 }
146 void slot_at_put(int which, CPSlot s) const {
147 assert(is_within_bounds(which), "index out of bounds");
148 assert(s.value() != 0, "Caught something");
149 *(intptr_t*)&base()[which] = s.value();
150 }
151 intptr_t* obj_at_addr_raw(int which) const {
152 assert(is_within_bounds(which), "index out of bounds");
153 return (intptr_t*) &base()[which];
154 }
156 jint* int_at_addr(int which) const {
157 assert(is_within_bounds(which), "index out of bounds");
158 return (jint*) &base()[which];
159 }
161 jlong* long_at_addr(int which) const {
162 assert(is_within_bounds(which), "index out of bounds");
163 return (jlong*) &base()[which];
164 }
166 jfloat* float_at_addr(int which) const {
167 assert(is_within_bounds(which), "index out of bounds");
168 return (jfloat*) &base()[which];
169 }
171 jdouble* double_at_addr(int which) const {
172 assert(is_within_bounds(which), "index out of bounds");
173 return (jdouble*) &base()[which];
174 }
176 ConstantPool(Array<u1>* tags);
177 ConstantPool() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
178 public:
179 static ConstantPool* allocate(ClassLoaderData* loader_data, int length, TRAPS);
181 bool is_constantPool() const volatile { return true; }
183 Array<u1>* tags() const { return _tags; }
184 Array<u2>* operands() const { return _operands; }
186 bool has_preresolution() const { return (_flags & _has_preresolution) != 0; }
187 void set_has_preresolution() { _flags |= _has_preresolution; }
189 // Redefine classes support. If a method refering to this constant pool
190 // is on the executing stack, or as a handle in vm code, this constant pool
191 // can't be removed from the set of previous versions saved in the instance
192 // class.
193 bool on_stack() const { return (_flags &_on_stack) != 0; }
194 void set_on_stack(const bool value);
196 // Klass holding pool
197 InstanceKlass* pool_holder() const { return _pool_holder; }
198 void set_pool_holder(InstanceKlass* k) { _pool_holder = k; }
199 InstanceKlass** pool_holder_addr() { return &_pool_holder; }
201 // Interpreter runtime support
202 ConstantPoolCache* cache() const { return _cache; }
203 void set_cache(ConstantPoolCache* cache){ _cache = cache; }
205 // Create object cache in the constant pool
206 void initialize_resolved_references(ClassLoaderData* loader_data,
207 intStack reference_map,
208 int constant_pool_map_length,
209 TRAPS);
211 // resolved strings, methodHandles and callsite objects from the constant pool
212 objArrayOop resolved_references() const;
213 // mapping resolved object array indexes to cp indexes and back.
214 int object_to_cp_index(int index) { return _reference_map->at(index); }
215 int cp_to_object_index(int index);
217 // Invokedynamic indexes.
218 // They must look completely different from normal indexes.
219 // The main reason is that byte swapping is sometimes done on normal indexes.
220 // Finally, it is helpful for debugging to tell the two apart.
221 static bool is_invokedynamic_index(int i) { return (i < 0); }
222 static int decode_invokedynamic_index(int i) { assert(is_invokedynamic_index(i), ""); return ~i; }
223 static int encode_invokedynamic_index(int i) { assert(!is_invokedynamic_index(i), ""); return ~i; }
226 // The invokedynamic points at a CP cache entry. This entry points back
227 // at the original CP entry (CONSTANT_InvokeDynamic) and also (via f2) at an entry
228 // in the resolved_references array (which provides the appendix argument).
229 int invokedynamic_cp_cache_index(int index) const {
230 assert (is_invokedynamic_index(index), "should be a invokedynamic index");
231 int cache_index = decode_invokedynamic_index(index);
232 return cache_index;
233 }
234 ConstantPoolCacheEntry* invokedynamic_cp_cache_entry_at(int index) const {
235 // decode index that invokedynamic points to.
236 int cp_cache_index = invokedynamic_cp_cache_index(index);
237 return cache()->entry_at(cp_cache_index);
238 }
240 // Assembly code support
241 static int tags_offset_in_bytes() { return offset_of(ConstantPool, _tags); }
242 static int cache_offset_in_bytes() { return offset_of(ConstantPool, _cache); }
243 static int pool_holder_offset_in_bytes() { return offset_of(ConstantPool, _pool_holder); }
244 static int resolved_references_offset_in_bytes() { return offset_of(ConstantPool, _resolved_references); }
246 // Storing constants
248 void klass_at_put(int which, Klass* k) {
249 assert(k != NULL, "resolved class shouldn't be null");
250 assert(is_within_bounds(which), "index out of bounds");
251 OrderAccess::release_store_ptr((Klass* volatile *)obj_at_addr_raw(which), k);
252 // The interpreter assumes when the tag is stored, the klass is resolved
253 // and the Klass* is a klass rather than a Symbol*, so we need
254 // hardware store ordering here.
255 release_tag_at_put(which, JVM_CONSTANT_Class);
256 }
258 // For temporary use while constructing constant pool
259 void klass_index_at_put(int which, int name_index) {
260 tag_at_put(which, JVM_CONSTANT_ClassIndex);
261 *int_at_addr(which) = name_index;
262 }
264 // Temporary until actual use
265 void unresolved_klass_at_put(int which, Symbol* s) {
266 release_tag_at_put(which, JVM_CONSTANT_UnresolvedClass);
267 slot_at_put(which, s);
268 }
270 void method_handle_index_at_put(int which, int ref_kind, int ref_index) {
271 tag_at_put(which, JVM_CONSTANT_MethodHandle);
272 *int_at_addr(which) = ((jint) ref_index<<16) | ref_kind;
273 }
275 void method_type_index_at_put(int which, int ref_index) {
276 tag_at_put(which, JVM_CONSTANT_MethodType);
277 *int_at_addr(which) = ref_index;
278 }
280 void invoke_dynamic_at_put(int which, int bootstrap_specifier_index, int name_and_type_index) {
281 tag_at_put(which, JVM_CONSTANT_InvokeDynamic);
282 *int_at_addr(which) = ((jint) name_and_type_index<<16) | bootstrap_specifier_index;
283 }
285 void unresolved_string_at_put(int which, Symbol* s) {
286 release_tag_at_put(which, JVM_CONSTANT_String);
287 *symbol_at_addr(which) = s;
288 }
290 void int_at_put(int which, jint i) {
291 tag_at_put(which, JVM_CONSTANT_Integer);
292 *int_at_addr(which) = i;
293 }
295 void long_at_put(int which, jlong l) {
296 tag_at_put(which, JVM_CONSTANT_Long);
297 // *long_at_addr(which) = l;
298 Bytes::put_native_u8((address)long_at_addr(which), *((u8*) &l));
299 }
301 void float_at_put(int which, jfloat f) {
302 tag_at_put(which, JVM_CONSTANT_Float);
303 *float_at_addr(which) = f;
304 }
306 void double_at_put(int which, jdouble d) {
307 tag_at_put(which, JVM_CONSTANT_Double);
308 // *double_at_addr(which) = d;
309 // u8 temp = *(u8*) &d;
310 Bytes::put_native_u8((address) double_at_addr(which), *((u8*) &d));
311 }
313 Symbol** symbol_at_addr(int which) const {
314 assert(is_within_bounds(which), "index out of bounds");
315 return (Symbol**) &base()[which];
316 }
318 void symbol_at_put(int which, Symbol* s) {
319 assert(s->refcount() != 0, "should have nonzero refcount");
320 tag_at_put(which, JVM_CONSTANT_Utf8);
321 *symbol_at_addr(which) = s;
322 }
324 void string_at_put(int which, int obj_index, oop str) {
325 resolved_references()->obj_at_put(obj_index, str);
326 }
328 // For temporary use while constructing constant pool
329 void string_index_at_put(int which, int string_index) {
330 tag_at_put(which, JVM_CONSTANT_StringIndex);
331 *int_at_addr(which) = string_index;
332 }
334 void field_at_put(int which, int class_index, int name_and_type_index) {
335 tag_at_put(which, JVM_CONSTANT_Fieldref);
336 *int_at_addr(which) = ((jint) name_and_type_index<<16) | class_index;
337 }
339 void method_at_put(int which, int class_index, int name_and_type_index) {
340 tag_at_put(which, JVM_CONSTANT_Methodref);
341 *int_at_addr(which) = ((jint) name_and_type_index<<16) | class_index;
342 }
344 void interface_method_at_put(int which, int class_index, int name_and_type_index) {
345 tag_at_put(which, JVM_CONSTANT_InterfaceMethodref);
346 *int_at_addr(which) = ((jint) name_and_type_index<<16) | class_index; // Not so nice
347 }
349 void name_and_type_at_put(int which, int name_index, int signature_index) {
350 tag_at_put(which, JVM_CONSTANT_NameAndType);
351 *int_at_addr(which) = ((jint) signature_index<<16) | name_index; // Not so nice
352 }
354 // Tag query
356 constantTag tag_at(int which) const { return (constantTag)tags()->at_acquire(which); }
358 // Fetching constants
360 Klass* klass_at(int which, TRAPS) {
361 constantPoolHandle h_this(THREAD, this);
362 return klass_at_impl(h_this, which, CHECK_NULL);
363 }
365 Symbol* klass_name_at(int which); // Returns the name, w/o resolving.
367 Klass* resolved_klass_at(int which) const { // Used by Compiler
368 guarantee(tag_at(which).is_klass(), "Corrupted constant pool");
369 // Must do an acquire here in case another thread resolved the klass
370 // behind our back, lest we later load stale values thru the oop.
371 return CPSlot((Klass*)OrderAccess::load_ptr_acquire(obj_at_addr_raw(which))).get_klass();
372 }
374 // This method should only be used with a cpool lock or during parsing or gc
375 Symbol* unresolved_klass_at(int which) { // Temporary until actual use
376 Symbol* s = CPSlot((Symbol*)OrderAccess::load_ptr_acquire(obj_at_addr_raw(which))).get_symbol();
377 // check that the klass is still unresolved.
378 assert(tag_at(which).is_unresolved_klass(), "Corrupted constant pool");
379 return s;
380 }
382 // RedefineClasses() API support:
383 Symbol* klass_at_noresolve(int which) { return klass_name_at(which); }
385 jint int_at(int which) {
386 assert(tag_at(which).is_int(), "Corrupted constant pool");
387 return *int_at_addr(which);
388 }
390 jlong long_at(int which) {
391 assert(tag_at(which).is_long(), "Corrupted constant pool");
392 // return *long_at_addr(which);
393 u8 tmp = Bytes::get_native_u8((address)&base()[which]);
394 return *((jlong*)&tmp);
395 }
397 jfloat float_at(int which) {
398 assert(tag_at(which).is_float(), "Corrupted constant pool");
399 return *float_at_addr(which);
400 }
402 jdouble double_at(int which) {
403 assert(tag_at(which).is_double(), "Corrupted constant pool");
404 u8 tmp = Bytes::get_native_u8((address)&base()[which]);
405 return *((jdouble*)&tmp);
406 }
408 Symbol* symbol_at(int which) {
409 assert(tag_at(which).is_utf8(), "Corrupted constant pool");
410 return *symbol_at_addr(which);
411 }
413 oop string_at(int which, int obj_index, TRAPS) {
414 constantPoolHandle h_this(THREAD, this);
415 return string_at_impl(h_this, which, obj_index, THREAD);
416 }
417 oop string_at(int which, TRAPS) {
418 int obj_index = cp_to_object_index(which);
419 return string_at(which, obj_index, THREAD);
420 }
422 // Version that can be used before string oop array is created.
423 oop uncached_string_at(int which, TRAPS);
425 // A "pseudo-string" is an non-string oop that has found is way into
426 // a String entry.
427 // Under EnableInvokeDynamic this can happen if the user patches a live
428 // object into a CONSTANT_String entry of an anonymous class.
429 // Method oops internally created for method handles may also
430 // use pseudo-strings to link themselves to related metaobjects.
432 bool is_pseudo_string_at(int which) {
433 // A pseudo string is a string that doesn't have a symbol in the cpSlot
434 return unresolved_string_at(which) == NULL;
435 }
437 oop pseudo_string_at(int which, int obj_index) {
438 assert(tag_at(which).is_string(), "Corrupted constant pool");
439 assert(unresolved_string_at(which) == NULL, "shouldn't have symbol");
440 oop s = resolved_references()->obj_at(obj_index);
441 return s;
442 }
444 oop pseudo_string_at(int which) {
445 assert(tag_at(which).is_string(), "Corrupted constant pool");
446 assert(unresolved_string_at(which) == NULL, "shouldn't have symbol");
447 int obj_index = cp_to_object_index(which);
448 oop s = resolved_references()->obj_at(obj_index);
449 return s;
450 }
452 void pseudo_string_at_put(int which, int obj_index, oop x) {
453 assert(EnableInvokeDynamic, "");
454 assert(tag_at(which).is_string(), "Corrupted constant pool");
455 unresolved_string_at_put(which, NULL); // indicates patched string
456 string_at_put(which, obj_index, x); // this works just fine
457 }
459 // only called when we are sure a string entry is already resolved (via an
460 // earlier string_at call.
461 oop resolved_string_at(int which) {
462 assert(tag_at(which).is_string(), "Corrupted constant pool");
463 // Must do an acquire here in case another thread resolved the klass
464 // behind our back, lest we later load stale values thru the oop.
465 // we might want a volatile_obj_at in ObjArrayKlass.
466 int obj_index = cp_to_object_index(which);
467 return resolved_references()->obj_at(obj_index);
468 }
470 Symbol* unresolved_string_at(int which) {
471 assert(tag_at(which).is_string(), "Corrupted constant pool");
472 Symbol* s = *symbol_at_addr(which);
473 return s;
474 }
476 // Returns an UTF8 for a CONSTANT_String entry at a given index.
477 // UTF8 char* representation was chosen to avoid conversion of
478 // java_lang_Strings at resolved entries into Symbol*s
479 // or vice versa.
480 // Caller is responsible for checking for pseudo-strings.
481 char* string_at_noresolve(int which);
483 jint name_and_type_at(int which) {
484 assert(tag_at(which).is_name_and_type(), "Corrupted constant pool");
485 return *int_at_addr(which);
486 }
488 private:
489 int method_handle_ref_kind_at(int which, bool error_ok) {
490 assert(tag_at(which).is_method_handle() ||
491 (error_ok && tag_at(which).is_method_handle_in_error()), "Corrupted constant pool");
492 return extract_low_short_from_int(*int_at_addr(which)); // mask out unwanted ref_index bits
493 }
494 int method_handle_index_at(int which, bool error_ok) {
495 assert(tag_at(which).is_method_handle() ||
496 (error_ok && tag_at(which).is_method_handle_in_error()), "Corrupted constant pool");
497 return extract_high_short_from_int(*int_at_addr(which)); // shift out unwanted ref_kind bits
498 }
499 int method_type_index_at(int which, bool error_ok) {
500 assert(tag_at(which).is_method_type() ||
501 (error_ok && tag_at(which).is_method_type_in_error()), "Corrupted constant pool");
502 return *int_at_addr(which);
503 }
504 public:
505 int method_handle_ref_kind_at(int which) {
506 return method_handle_ref_kind_at(which, false);
507 }
508 int method_handle_ref_kind_at_error_ok(int which) {
509 return method_handle_ref_kind_at(which, true);
510 }
511 int method_handle_index_at(int which) {
512 return method_handle_index_at(which, false);
513 }
514 int method_handle_index_at_error_ok(int which) {
515 return method_handle_index_at(which, true);
516 }
517 int method_type_index_at(int which) {
518 return method_type_index_at(which, false);
519 }
520 int method_type_index_at_error_ok(int which) {
521 return method_type_index_at(which, true);
522 }
524 // Derived queries:
525 Symbol* method_handle_name_ref_at(int which) {
526 int member = method_handle_index_at(which);
527 return impl_name_ref_at(member, true);
528 }
529 Symbol* method_handle_signature_ref_at(int which) {
530 int member = method_handle_index_at(which);
531 return impl_signature_ref_at(member, true);
532 }
533 int method_handle_klass_index_at(int which) {
534 int member = method_handle_index_at(which);
535 return impl_klass_ref_index_at(member, true);
536 }
537 Symbol* method_type_signature_at(int which) {
538 int sym = method_type_index_at(which);
539 return symbol_at(sym);
540 }
542 int invoke_dynamic_name_and_type_ref_index_at(int which) {
543 assert(tag_at(which).is_invoke_dynamic(), "Corrupted constant pool");
544 return extract_high_short_from_int(*int_at_addr(which));
545 }
546 int invoke_dynamic_bootstrap_specifier_index(int which) {
547 assert(tag_at(which).value() == JVM_CONSTANT_InvokeDynamic, "Corrupted constant pool");
548 return extract_low_short_from_int(*int_at_addr(which));
549 }
550 int invoke_dynamic_operand_base(int which) {
551 int bootstrap_specifier_index = invoke_dynamic_bootstrap_specifier_index(which);
552 return operand_offset_at(operands(), bootstrap_specifier_index);
553 }
554 // The first part of the operands array consists of an index into the second part.
555 // Extract a 32-bit index value from the first part.
556 static int operand_offset_at(Array<u2>* operands, int bootstrap_specifier_index) {
557 int n = (bootstrap_specifier_index * 2);
558 assert(n >= 0 && n+2 <= operands->length(), "oob");
559 // The first 32-bit index points to the beginning of the second part
560 // of the operands array. Make sure this index is in the first part.
561 DEBUG_ONLY(int second_part = build_int_from_shorts(operands->at(0),
562 operands->at(1)));
563 assert(second_part == 0 || n+2 <= second_part, "oob (2)");
564 int offset = build_int_from_shorts(operands->at(n+0),
565 operands->at(n+1));
566 // The offset itself must point into the second part of the array.
567 assert(offset == 0 || offset >= second_part && offset <= operands->length(), "oob (3)");
568 return offset;
569 }
570 static void operand_offset_at_put(Array<u2>* operands, int bootstrap_specifier_index, int offset) {
571 int n = bootstrap_specifier_index * 2;
572 assert(n >= 0 && n+2 <= operands->length(), "oob");
573 operands->at_put(n+0, extract_low_short_from_int(offset));
574 operands->at_put(n+1, extract_high_short_from_int(offset));
575 }
576 static int operand_array_length(Array<u2>* operands) {
577 if (operands == NULL || operands->length() == 0) return 0;
578 int second_part = operand_offset_at(operands, 0);
579 return (second_part / 2);
580 }
582 #ifdef ASSERT
583 // operand tuples fit together exactly, end to end
584 static int operand_limit_at(Array<u2>* operands, int bootstrap_specifier_index) {
585 int nextidx = bootstrap_specifier_index + 1;
586 if (nextidx == operand_array_length(operands))
587 return operands->length();
588 else
589 return operand_offset_at(operands, nextidx);
590 }
591 int invoke_dynamic_operand_limit(int which) {
592 int bootstrap_specifier_index = invoke_dynamic_bootstrap_specifier_index(which);
593 return operand_limit_at(operands(), bootstrap_specifier_index);
594 }
595 #endif //ASSERT
597 // layout of InvokeDynamic bootstrap method specifier (in second part of operands array):
598 enum {
599 _indy_bsm_offset = 0, // CONSTANT_MethodHandle bsm
600 _indy_argc_offset = 1, // u2 argc
601 _indy_argv_offset = 2 // u2 argv[argc]
602 };
604 // These functions are used in RedefineClasses for CP merge
606 int operand_offset_at(int bootstrap_specifier_index) {
607 assert(0 <= bootstrap_specifier_index &&
608 bootstrap_specifier_index < operand_array_length(operands()),
609 "Corrupted CP operands");
610 return operand_offset_at(operands(), bootstrap_specifier_index);
611 }
612 int operand_bootstrap_method_ref_index_at(int bootstrap_specifier_index) {
613 int offset = operand_offset_at(bootstrap_specifier_index);
614 return operands()->at(offset + _indy_bsm_offset);
615 }
616 int operand_argument_count_at(int bootstrap_specifier_index) {
617 int offset = operand_offset_at(bootstrap_specifier_index);
618 int argc = operands()->at(offset + _indy_argc_offset);
619 return argc;
620 }
621 int operand_argument_index_at(int bootstrap_specifier_index, int j) {
622 int offset = operand_offset_at(bootstrap_specifier_index);
623 return operands()->at(offset + _indy_argv_offset + j);
624 }
625 int operand_next_offset_at(int bootstrap_specifier_index) {
626 int offset = operand_offset_at(bootstrap_specifier_index) + _indy_argv_offset
627 + operand_argument_count_at(bootstrap_specifier_index);
628 return offset;
629 }
630 // Compare a bootsrap specifier in the operands arrays
631 bool compare_operand_to(int bootstrap_specifier_index1, constantPoolHandle cp2,
632 int bootstrap_specifier_index2, TRAPS);
633 // Find a bootsrap specifier in the operands array
634 int find_matching_operand(int bootstrap_specifier_index, constantPoolHandle search_cp,
635 int operands_cur_len, TRAPS);
636 // Resize the operands array with delta_len and delta_size
637 void resize_operands(int delta_len, int delta_size, TRAPS);
638 // Extend the operands array with the length and size of the ext_cp operands
639 void extend_operands(constantPoolHandle ext_cp, TRAPS);
640 // Shrink the operands array to a smaller array with new_len length
641 void shrink_operands(int new_len, TRAPS);
644 int invoke_dynamic_bootstrap_method_ref_index_at(int which) {
645 assert(tag_at(which).is_invoke_dynamic(), "Corrupted constant pool");
646 int op_base = invoke_dynamic_operand_base(which);
647 return operands()->at(op_base + _indy_bsm_offset);
648 }
649 int invoke_dynamic_argument_count_at(int which) {
650 assert(tag_at(which).is_invoke_dynamic(), "Corrupted constant pool");
651 int op_base = invoke_dynamic_operand_base(which);
652 int argc = operands()->at(op_base + _indy_argc_offset);
653 DEBUG_ONLY(int end_offset = op_base + _indy_argv_offset + argc;
654 int next_offset = invoke_dynamic_operand_limit(which));
655 assert(end_offset == next_offset, "matched ending");
656 return argc;
657 }
658 int invoke_dynamic_argument_index_at(int which, int j) {
659 int op_base = invoke_dynamic_operand_base(which);
660 DEBUG_ONLY(int argc = operands()->at(op_base + _indy_argc_offset));
661 assert((uint)j < (uint)argc, "oob");
662 return operands()->at(op_base + _indy_argv_offset + j);
663 }
665 // The following methods (name/signature/klass_ref_at, klass_ref_at_noresolve,
666 // name_and_type_ref_index_at) all expect to be passed indices obtained
667 // directly from the bytecode.
668 // If the indices are meant to refer to fields or methods, they are
669 // actually rewritten constant pool cache indices.
670 // The routine remap_instruction_operand_from_cache manages the adjustment
671 // of these values back to constant pool indices.
673 // There are also "uncached" versions which do not adjust the operand index; see below.
675 // FIXME: Consider renaming these with a prefix "cached_" to make the distinction clear.
676 // In a few cases (the verifier) there are uses before a cpcache has been built,
677 // which are handled by a dynamic check in remap_instruction_operand_from_cache.
678 // FIXME: Remove the dynamic check, and adjust all callers to specify the correct mode.
680 // Lookup for entries consisting of (klass_index, name_and_type index)
681 Klass* klass_ref_at(int which, TRAPS);
682 Symbol* klass_ref_at_noresolve(int which);
683 Symbol* name_ref_at(int which) { return impl_name_ref_at(which, false); }
684 Symbol* signature_ref_at(int which) { return impl_signature_ref_at(which, false); }
686 int klass_ref_index_at(int which) { return impl_klass_ref_index_at(which, false); }
687 int name_and_type_ref_index_at(int which) { return impl_name_and_type_ref_index_at(which, false); }
689 // Lookup for entries consisting of (name_index, signature_index)
690 int name_ref_index_at(int which_nt); // == low-order jshort of name_and_type_at(which_nt)
691 int signature_ref_index_at(int which_nt); // == high-order jshort of name_and_type_at(which_nt)
693 BasicType basic_type_for_signature_at(int which);
695 // Resolve string constants (to prevent allocation during compilation)
696 void resolve_string_constants(TRAPS) {
697 constantPoolHandle h_this(THREAD, this);
698 resolve_string_constants_impl(h_this, CHECK);
699 }
701 // CDS support
702 void remove_unshareable_info();
703 void restore_unshareable_info(TRAPS);
704 bool resolve_class_constants(TRAPS);
705 // The ConstantPool vtable is restored by this call when the ConstantPool is
706 // in the shared archive. See patch_klass_vtables() in metaspaceShared.cpp for
707 // all the gory details. SA, dtrace and pstack helpers distinguish metadata
708 // by their vtable.
709 void restore_vtable() { guarantee(is_constantPool(), "vtable restored by this call"); }
711 private:
712 enum { _no_index_sentinel = -1, _possible_index_sentinel = -2 };
713 public:
715 // Resolve late bound constants.
716 oop resolve_constant_at(int index, TRAPS) {
717 constantPoolHandle h_this(THREAD, this);
718 return resolve_constant_at_impl(h_this, index, _no_index_sentinel, THREAD);
719 }
721 oop resolve_cached_constant_at(int cache_index, TRAPS) {
722 constantPoolHandle h_this(THREAD, this);
723 return resolve_constant_at_impl(h_this, _no_index_sentinel, cache_index, THREAD);
724 }
726 oop resolve_possibly_cached_constant_at(int pool_index, TRAPS) {
727 constantPoolHandle h_this(THREAD, this);
728 return resolve_constant_at_impl(h_this, pool_index, _possible_index_sentinel, THREAD);
729 }
731 oop resolve_bootstrap_specifier_at(int index, TRAPS) {
732 constantPoolHandle h_this(THREAD, this);
733 return resolve_bootstrap_specifier_at_impl(h_this, index, THREAD);
734 }
736 // Klass name matches name at offset
737 bool klass_name_at_matches(instanceKlassHandle k, int which);
739 // Sizing
740 int length() const { return _length; }
741 void set_length(int length) { _length = length; }
743 // Tells whether index is within bounds.
744 bool is_within_bounds(int index) const {
745 return 0 <= index && index < length();
746 }
748 // Sizing (in words)
749 static int header_size() { return sizeof(ConstantPool)/HeapWordSize; }
750 static int size(int length) { return align_object_size(header_size() + length); }
751 int size() const { return size(length()); }
752 #if INCLUDE_SERVICES
753 void collect_statistics(KlassSizeStats *sz) const;
754 #endif
756 friend class ClassFileParser;
757 friend class SystemDictionary;
759 // Used by compiler to prevent classloading.
760 static Method* method_at_if_loaded (constantPoolHandle this_oop, int which);
761 static bool has_appendix_at_if_loaded (constantPoolHandle this_oop, int which);
762 static oop appendix_at_if_loaded (constantPoolHandle this_oop, int which);
763 static bool has_method_type_at_if_loaded (constantPoolHandle this_oop, int which);
764 static oop method_type_at_if_loaded (constantPoolHandle this_oop, int which);
765 static Klass* klass_at_if_loaded (constantPoolHandle this_oop, int which);
766 static Klass* klass_ref_at_if_loaded (constantPoolHandle this_oop, int which);
768 // Routines currently used for annotations (only called by jvm.cpp) but which might be used in the
769 // future by other Java code. These take constant pool indices rather than
770 // constant pool cache indices as do the peer methods above.
771 Symbol* uncached_klass_ref_at_noresolve(int which);
772 Symbol* uncached_name_ref_at(int which) { return impl_name_ref_at(which, true); }
773 Symbol* uncached_signature_ref_at(int which) { return impl_signature_ref_at(which, true); }
774 int uncached_klass_ref_index_at(int which) { return impl_klass_ref_index_at(which, true); }
775 int uncached_name_and_type_ref_index_at(int which) { return impl_name_and_type_ref_index_at(which, true); }
777 // Sharing
778 int pre_resolve_shared_klasses(TRAPS);
780 // Debugging
781 const char* printable_name_at(int which) PRODUCT_RETURN0;
783 #ifdef ASSERT
784 enum { CPCACHE_INDEX_TAG = 0x10000 }; // helps keep CP cache indices distinct from CP indices
785 #else
786 enum { CPCACHE_INDEX_TAG = 0 }; // in product mode, this zero value is a no-op
787 #endif //ASSERT
789 static int decode_cpcache_index(int raw_index, bool invokedynamic_ok = false) {
790 if (invokedynamic_ok && is_invokedynamic_index(raw_index))
791 return decode_invokedynamic_index(raw_index);
792 else
793 return raw_index - CPCACHE_INDEX_TAG;
794 }
796 private:
798 void set_resolved_references(jobject s) { _resolved_references = s; }
799 Array<u2>* reference_map() const { return _reference_map; }
800 void set_reference_map(Array<u2>* o) { _reference_map = o; }
802 // patch JSR 292 resolved references after the class is linked.
803 void patch_resolved_references(GrowableArray<Handle>* cp_patches);
805 Symbol* impl_name_ref_at(int which, bool uncached);
806 Symbol* impl_signature_ref_at(int which, bool uncached);
807 int impl_klass_ref_index_at(int which, bool uncached);
808 int impl_name_and_type_ref_index_at(int which, bool uncached);
810 int remap_instruction_operand_from_cache(int operand); // operand must be biased by CPCACHE_INDEX_TAG
812 // Used while constructing constant pool (only by ClassFileParser)
813 jint klass_index_at(int which) {
814 assert(tag_at(which).is_klass_index(), "Corrupted constant pool");
815 return *int_at_addr(which);
816 }
818 jint string_index_at(int which) {
819 assert(tag_at(which).is_string_index(), "Corrupted constant pool");
820 return *int_at_addr(which);
821 }
823 // Performs the LinkResolver checks
824 static void verify_constant_pool_resolve(constantPoolHandle this_oop, KlassHandle klass, TRAPS);
826 // Implementation of methods that needs an exposed 'this' pointer, in order to
827 // handle GC while executing the method
828 static Klass* klass_at_impl(constantPoolHandle this_oop, int which, TRAPS);
829 static oop string_at_impl(constantPoolHandle this_oop, int which, int obj_index, TRAPS);
831 // Resolve string constants (to prevent allocation during compilation)
832 static void resolve_string_constants_impl(constantPoolHandle this_oop, TRAPS);
834 static oop resolve_constant_at_impl(constantPoolHandle this_oop, int index, int cache_index, TRAPS);
835 static void save_and_throw_exception(constantPoolHandle this_oop, int which, int tag_value, TRAPS);
836 static oop resolve_bootstrap_specifier_at_impl(constantPoolHandle this_oop, int index, TRAPS);
838 public:
839 // Merging ConstantPool* support:
840 bool compare_entry_to(int index1, constantPoolHandle cp2, int index2, TRAPS);
841 void copy_cp_to(int start_i, int end_i, constantPoolHandle to_cp, int to_i, TRAPS) {
842 constantPoolHandle h_this(THREAD, this);
843 copy_cp_to_impl(h_this, start_i, end_i, to_cp, to_i, THREAD);
844 }
845 static void copy_cp_to_impl(constantPoolHandle from_cp, int start_i, int end_i, constantPoolHandle to_cp, int to_i, TRAPS);
846 static void copy_entry_to(constantPoolHandle from_cp, int from_i, constantPoolHandle to_cp, int to_i, TRAPS);
847 static void copy_operands(constantPoolHandle from_cp, constantPoolHandle to_cp, TRAPS);
848 int find_matching_entry(int pattern_i, constantPoolHandle search_cp, TRAPS);
849 int version() const { return _saved._version; }
850 void set_version(int version) { _saved._version = version; }
851 void increment_and_save_version(int version) {
852 _saved._version = version >= 0 ? (version + 1) : version; // keep overflow
853 }
855 void set_resolved_reference_length(int length) { _saved._resolved_reference_length = length; }
856 int resolved_reference_length() const { return _saved._resolved_reference_length; }
857 void set_lock(Monitor* lock) { _lock = lock; }
858 Monitor* lock() { return _lock; }
860 // Decrease ref counts of symbols that are in the constant pool
861 // when the holder class is unloaded
862 void unreference_symbols();
864 // Deallocate constant pool for RedefineClasses
865 void deallocate_contents(ClassLoaderData* loader_data);
866 void release_C_heap_structures();
868 // JVMTI accesss - GetConstantPool, RetransformClasses, ...
869 friend class JvmtiConstantPoolReconstituter;
871 private:
872 jint cpool_entry_size(jint idx);
873 jint hash_entries_to(SymbolHashMap *symmap, SymbolHashMap *classmap);
875 // Copy cpool bytes into byte array.
876 // Returns:
877 // int > 0, count of the raw cpool bytes that have been copied
878 // 0, OutOfMemory error
879 // -1, Internal error
880 int copy_cpool_bytes(int cpool_size,
881 SymbolHashMap* tbl,
882 unsigned char *bytes);
884 public:
885 // Verify
886 void verify_on(outputStream* st);
888 // Printing
889 void print_on(outputStream* st) const;
890 void print_value_on(outputStream* st) const;
891 void print_entry_on(int index, outputStream* st);
893 const char* internal_name() const { return "{constant pool}"; }
895 #ifndef PRODUCT
896 // Compile the world support
897 static void preload_and_initialize_all_classes(ConstantPool* constant_pool, TRAPS);
898 #endif
899 };
901 class SymbolHashMapEntry : public CHeapObj<mtSymbol> {
902 private:
903 unsigned int _hash; // 32-bit hash for item
904 SymbolHashMapEntry* _next; // Next element in the linked list for this bucket
905 Symbol* _symbol; // 1-st part of the mapping: symbol => value
906 u2 _value; // 2-nd part of the mapping: symbol => value
908 public:
909 unsigned int hash() const { return _hash; }
910 void set_hash(unsigned int hash) { _hash = hash; }
912 SymbolHashMapEntry* next() const { return _next; }
913 void set_next(SymbolHashMapEntry* next) { _next = next; }
915 Symbol* symbol() const { return _symbol; }
916 void set_symbol(Symbol* sym) { _symbol = sym; }
918 u2 value() const { return _value; }
919 void set_value(u2 value) { _value = value; }
921 SymbolHashMapEntry(unsigned int hash, Symbol* symbol, u2 value)
922 : _hash(hash), _symbol(symbol), _value(value), _next(NULL) {}
924 }; // End SymbolHashMapEntry class
927 class SymbolHashMapBucket : public CHeapObj<mtSymbol> {
929 private:
930 SymbolHashMapEntry* _entry;
932 public:
933 SymbolHashMapEntry* entry() const { return _entry; }
934 void set_entry(SymbolHashMapEntry* entry) { _entry = entry; }
935 void clear() { _entry = NULL; }
937 }; // End SymbolHashMapBucket class
940 class SymbolHashMap: public CHeapObj<mtSymbol> {
942 private:
943 // Default number of entries in the table
944 enum SymbolHashMap_Constants {
945 _Def_HashMap_Size = 256
946 };
948 int _table_size;
949 SymbolHashMapBucket* _buckets;
951 void initialize_table(int table_size) {
952 _table_size = table_size;
953 _buckets = NEW_C_HEAP_ARRAY(SymbolHashMapBucket, table_size, mtSymbol);
954 for (int index = 0; index < table_size; index++) {
955 _buckets[index].clear();
956 }
957 }
959 public:
961 int table_size() const { return _table_size; }
963 SymbolHashMap() { initialize_table(_Def_HashMap_Size); }
964 SymbolHashMap(int table_size) { initialize_table(table_size); }
966 // hash P(31) from Kernighan & Ritchie
967 static unsigned int compute_hash(const char* str, int len) {
968 unsigned int hash = 0;
969 while (len-- > 0) {
970 hash = 31*hash + (unsigned) *str;
971 str++;
972 }
973 return hash;
974 }
976 SymbolHashMapEntry* bucket(int i) {
977 return _buckets[i].entry();
978 }
980 void add_entry(Symbol* sym, u2 value);
981 SymbolHashMapEntry* find_entry(Symbol* sym);
983 u2 symbol_to_value(Symbol* sym) {
984 SymbolHashMapEntry *entry = find_entry(sym);
985 return (entry == NULL) ? 0 : entry->value();
986 }
988 ~SymbolHashMap() {
989 SymbolHashMapEntry* next;
990 for (int i = 0; i < _table_size; i++) {
991 for (SymbolHashMapEntry* cur = bucket(i); cur != NULL; cur = next) {
992 next = cur->next();
993 delete(cur);
994 }
995 }
996 delete _buckets;
997 }
998 }; // End SymbolHashMap class
1000 #endif // SHARE_VM_OOPS_CONSTANTPOOLOOP_HPP