Tue, 23 Nov 2010 13:22:55 -0800
6989984: Use standard include model for Hospot
Summary: Replaced MakeDeps and the includeDB files with more standardized solutions.
Reviewed-by: coleenp, kvn, kamg
1 /*
2 * Copyright (c) 1997, 2010, 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.
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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
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23 */
25 #ifndef SHARE_VM_OOPS_CONSTANTPOOLOOP_HPP
26 #define SHARE_VM_OOPS_CONSTANTPOOLOOP_HPP
28 #include "oops/arrayOop.hpp"
29 #include "oops/cpCacheOop.hpp"
30 #include "oops/typeArrayOop.hpp"
31 #include "utilities/constantTag.hpp"
32 #ifdef TARGET_ARCH_x86
33 # include "bytes_x86.hpp"
34 #endif
35 #ifdef TARGET_ARCH_sparc
36 # include "bytes_sparc.hpp"
37 #endif
38 #ifdef TARGET_ARCH_zero
39 # include "bytes_zero.hpp"
40 #endif
42 // A constantPool is an array containing class constants as described in the
43 // class file.
44 //
45 // Most of the constant pool entries are written during class parsing, which
46 // is safe. For klass and string types, the constant pool entry is
47 // modified when the entry is resolved. If a klass or string constant pool
48 // entry is read without a lock, only the resolved state guarantees that
49 // the entry in the constant pool is a klass or String object and
50 // not a symbolOop.
52 class SymbolHashMap;
54 class constantPoolOopDesc : public oopDesc {
55 friend class VMStructs;
56 friend class BytecodeInterpreter; // Directly extracts an oop in the pool for fast instanceof/checkcast
57 private:
58 typeArrayOop _tags; // the tag array describing the constant pool's contents
59 constantPoolCacheOop _cache; // the cache holding interpreter runtime information
60 klassOop _pool_holder; // the corresponding class
61 typeArrayOop _operands; // for variable-sized (InvokeDynamic) nodes, usually empty
62 int _flags; // a few header bits to describe contents for GC
63 int _length; // number of elements in the array
64 volatile bool _is_conc_safe; // if true, safe for concurrent
65 // GC processing
66 // only set to non-zero if constant pool is merged by RedefineClasses
67 int _orig_length;
69 void set_tags(typeArrayOop tags) { oop_store_without_check((oop*)&_tags, tags); }
70 void tag_at_put(int which, jbyte t) { tags()->byte_at_put(which, t); }
71 void release_tag_at_put(int which, jbyte t) { tags()->release_byte_at_put(which, t); }
73 void set_operands(typeArrayOop operands) { oop_store_without_check((oop*)&_operands, operands); }
75 enum FlagBit {
76 FB_has_invokedynamic = 1,
77 FB_has_pseudo_string = 2
78 };
80 int flags() const { return _flags; }
81 void set_flags(int f) { _flags = f; }
82 bool flag_at(FlagBit fb) const { return (_flags & (1 << (int)fb)) != 0; }
83 void set_flag_at(FlagBit fb);
84 // no clear_flag_at function; they only increase
86 private:
87 intptr_t* base() const { return (intptr_t*) (((char*) this) + sizeof(constantPoolOopDesc)); }
88 oop* tags_addr() { return (oop*)&_tags; }
89 oop* cache_addr() { return (oop*)&_cache; }
90 oop* operands_addr() { return (oop*)&_operands; }
92 oop* obj_at_addr(int which) const {
93 assert(is_within_bounds(which), "index out of bounds");
94 return (oop*) &base()[which];
95 }
97 jint* int_at_addr(int which) const {
98 assert(is_within_bounds(which), "index out of bounds");
99 return (jint*) &base()[which];
100 }
102 jlong* long_at_addr(int which) const {
103 assert(is_within_bounds(which), "index out of bounds");
104 return (jlong*) &base()[which];
105 }
107 jfloat* float_at_addr(int which) const {
108 assert(is_within_bounds(which), "index out of bounds");
109 return (jfloat*) &base()[which];
110 }
112 jdouble* double_at_addr(int which) const {
113 assert(is_within_bounds(which), "index out of bounds");
114 return (jdouble*) &base()[which];
115 }
117 public:
118 typeArrayOop tags() const { return _tags; }
119 typeArrayOop operands() const { return _operands; }
121 bool has_pseudo_string() const { return flag_at(FB_has_pseudo_string); }
122 bool has_invokedynamic() const { return flag_at(FB_has_invokedynamic); }
123 void set_pseudo_string() { set_flag_at(FB_has_pseudo_string); }
124 void set_invokedynamic() { set_flag_at(FB_has_invokedynamic); }
126 // Klass holding pool
127 klassOop pool_holder() const { return _pool_holder; }
128 void set_pool_holder(klassOop k) { oop_store_without_check((oop*)&_pool_holder, (oop) k); }
129 oop* pool_holder_addr() { return (oop*)&_pool_holder; }
131 // Interpreter runtime support
132 constantPoolCacheOop cache() const { return _cache; }
133 void set_cache(constantPoolCacheOop cache){ oop_store((oop*)&_cache, cache); }
135 // Assembly code support
136 static int tags_offset_in_bytes() { return offset_of(constantPoolOopDesc, _tags); }
137 static int cache_offset_in_bytes() { return offset_of(constantPoolOopDesc, _cache); }
138 static int operands_offset_in_bytes() { return offset_of(constantPoolOopDesc, _operands); }
139 static int pool_holder_offset_in_bytes() { return offset_of(constantPoolOopDesc, _pool_holder); }
141 // Storing constants
143 void klass_at_put(int which, klassOop k) {
144 oop_store_without_check((volatile oop *)obj_at_addr(which), oop(k));
145 // The interpreter assumes when the tag is stored, the klass is resolved
146 // and the klassOop is a klass rather than a symbolOop, so we need
147 // hardware store ordering here.
148 release_tag_at_put(which, JVM_CONSTANT_Class);
149 if (UseConcMarkSweepGC) {
150 // In case the earlier card-mark was consumed by a concurrent
151 // marking thread before the tag was updated, redirty the card.
152 oop_store_without_check((volatile oop *)obj_at_addr(which), oop(k));
153 }
154 }
156 // For temporary use while constructing constant pool
157 void klass_index_at_put(int which, int name_index) {
158 tag_at_put(which, JVM_CONSTANT_ClassIndex);
159 *int_at_addr(which) = name_index;
160 }
162 // Temporary until actual use
163 void unresolved_klass_at_put(int which, symbolOop s) {
164 // Overwrite the old index with a GC friendly value so
165 // that if GC looks during the transition it won't try
166 // to treat a small integer as oop.
167 *obj_at_addr(which) = NULL;
168 release_tag_at_put(which, JVM_CONSTANT_UnresolvedClass);
169 oop_store_without_check(obj_at_addr(which), oop(s));
170 }
172 void method_handle_index_at_put(int which, int ref_kind, int ref_index) {
173 tag_at_put(which, JVM_CONSTANT_MethodHandle);
174 *int_at_addr(which) = ((jint) ref_index<<16) | ref_kind;
175 }
177 void method_type_index_at_put(int which, int ref_index) {
178 tag_at_put(which, JVM_CONSTANT_MethodType);
179 *int_at_addr(which) = ref_index;
180 }
182 void invoke_dynamic_at_put(int which, int operand_base, int operand_count) {
183 tag_at_put(which, JVM_CONSTANT_InvokeDynamic);
184 *int_at_addr(which) = operand_base; // this is the real information
185 }
186 #ifdef ASSERT
187 bool check_invoke_dynamic_at(int which,
188 int bootstrap_method_index,
189 int name_and_type_index,
190 int argument_count) {
191 assert(invoke_dynamic_bootstrap_method_ref_index_at(which) == bootstrap_method_index,
192 "already stored by caller");
193 assert(invoke_dynamic_name_and_type_ref_index_at(which) == name_and_type_index,
194 "already stored by caller");
195 assert(invoke_dynamic_argument_count_at(which) == argument_count,
196 "consistent argument count");
197 if (argument_count != 0) {
198 invoke_dynamic_argument_index_at(which, 0);
199 invoke_dynamic_argument_index_at(which, argument_count - 1);
200 }
201 return true;
202 }
203 #endif //ASSERT
205 // Temporary until actual use
206 void unresolved_string_at_put(int which, symbolOop s) {
207 *obj_at_addr(which) = NULL;
208 release_tag_at_put(which, JVM_CONSTANT_UnresolvedString);
209 oop_store_without_check(obj_at_addr(which), oop(s));
210 }
212 void int_at_put(int which, jint i) {
213 tag_at_put(which, JVM_CONSTANT_Integer);
214 *int_at_addr(which) = i;
215 }
217 void long_at_put(int which, jlong l) {
218 tag_at_put(which, JVM_CONSTANT_Long);
219 // *long_at_addr(which) = l;
220 Bytes::put_native_u8((address)long_at_addr(which), *((u8*) &l));
221 }
223 void float_at_put(int which, jfloat f) {
224 tag_at_put(which, JVM_CONSTANT_Float);
225 *float_at_addr(which) = f;
226 }
228 void double_at_put(int which, jdouble d) {
229 tag_at_put(which, JVM_CONSTANT_Double);
230 // *double_at_addr(which) = d;
231 // u8 temp = *(u8*) &d;
232 Bytes::put_native_u8((address) double_at_addr(which), *((u8*) &d));
233 }
235 void symbol_at_put(int which, symbolOop s) {
236 tag_at_put(which, JVM_CONSTANT_Utf8);
237 oop_store_without_check(obj_at_addr(which), oop(s));
238 }
240 void string_at_put(int which, oop str) {
241 oop_store((volatile oop*)obj_at_addr(which), str);
242 release_tag_at_put(which, JVM_CONSTANT_String);
243 if (UseConcMarkSweepGC) {
244 // In case the earlier card-mark was consumed by a concurrent
245 // marking thread before the tag was updated, redirty the card.
246 oop_store_without_check((volatile oop *)obj_at_addr(which), str);
247 }
248 }
250 void object_at_put(int which, oop str) {
251 oop_store((volatile oop*) obj_at_addr(which), str);
252 release_tag_at_put(which, JVM_CONSTANT_Object);
253 if (UseConcMarkSweepGC) {
254 // In case the earlier card-mark was consumed by a concurrent
255 // marking thread before the tag was updated, redirty the card.
256 oop_store_without_check((volatile oop*) obj_at_addr(which), str);
257 }
258 }
260 // For temporary use while constructing constant pool
261 void string_index_at_put(int which, int string_index) {
262 tag_at_put(which, JVM_CONSTANT_StringIndex);
263 *int_at_addr(which) = string_index;
264 }
266 void field_at_put(int which, int class_index, int name_and_type_index) {
267 tag_at_put(which, JVM_CONSTANT_Fieldref);
268 *int_at_addr(which) = ((jint) name_and_type_index<<16) | class_index;
269 }
271 void method_at_put(int which, int class_index, int name_and_type_index) {
272 tag_at_put(which, JVM_CONSTANT_Methodref);
273 *int_at_addr(which) = ((jint) name_and_type_index<<16) | class_index;
274 }
276 void interface_method_at_put(int which, int class_index, int name_and_type_index) {
277 tag_at_put(which, JVM_CONSTANT_InterfaceMethodref);
278 *int_at_addr(which) = ((jint) name_and_type_index<<16) | class_index; // Not so nice
279 }
281 void name_and_type_at_put(int which, int name_index, int signature_index) {
282 tag_at_put(which, JVM_CONSTANT_NameAndType);
283 *int_at_addr(which) = ((jint) signature_index<<16) | name_index; // Not so nice
284 }
286 // Tag query
288 constantTag tag_at(int which) const { return (constantTag)tags()->byte_at_acquire(which); }
290 // Whether the entry is a pointer that must be GC'd.
291 bool is_pointer_entry(int which) {
292 constantTag tag = tag_at(which);
293 return tag.is_klass() ||
294 tag.is_unresolved_klass() ||
295 tag.is_symbol() ||
296 tag.is_unresolved_string() ||
297 tag.is_string() ||
298 tag.is_object();
299 }
301 // Fetching constants
303 klassOop klass_at(int which, TRAPS) {
304 constantPoolHandle h_this(THREAD, this);
305 return klass_at_impl(h_this, which, CHECK_NULL);
306 }
308 symbolOop klass_name_at(int which); // Returns the name, w/o resolving.
310 klassOop resolved_klass_at(int which) { // Used by Compiler
311 guarantee(tag_at(which).is_klass(), "Corrupted constant pool");
312 // Must do an acquire here in case another thread resolved the klass
313 // behind our back, lest we later load stale values thru the oop.
314 return klassOop((oop)OrderAccess::load_ptr_acquire(obj_at_addr(which)));
315 }
317 // This method should only be used with a cpool lock or during parsing or gc
318 symbolOop unresolved_klass_at(int which) { // Temporary until actual use
319 symbolOop s = symbolOop((oop)OrderAccess::load_ptr_acquire(obj_at_addr(which)));
320 // check that the klass is still unresolved.
321 assert(tag_at(which).is_unresolved_klass(), "Corrupted constant pool");
322 return s;
323 }
325 // RedefineClasses() API support:
326 symbolOop klass_at_noresolve(int which) { return klass_name_at(which); }
328 jint int_at(int which) {
329 assert(tag_at(which).is_int(), "Corrupted constant pool");
330 return *int_at_addr(which);
331 }
333 jlong long_at(int which) {
334 assert(tag_at(which).is_long(), "Corrupted constant pool");
335 // return *long_at_addr(which);
336 u8 tmp = Bytes::get_native_u8((address)&base()[which]);
337 return *((jlong*)&tmp);
338 }
340 jfloat float_at(int which) {
341 assert(tag_at(which).is_float(), "Corrupted constant pool");
342 return *float_at_addr(which);
343 }
345 jdouble double_at(int which) {
346 assert(tag_at(which).is_double(), "Corrupted constant pool");
347 u8 tmp = Bytes::get_native_u8((address)&base()[which]);
348 return *((jdouble*)&tmp);
349 }
351 symbolOop symbol_at(int which) {
352 assert(tag_at(which).is_utf8(), "Corrupted constant pool");
353 return symbolOop(*obj_at_addr(which));
354 }
356 oop string_at(int which, TRAPS) {
357 constantPoolHandle h_this(THREAD, this);
358 return string_at_impl(h_this, which, CHECK_NULL);
359 }
361 oop object_at(int which) {
362 assert(tag_at(which).is_object(), "Corrupted constant pool");
363 return *obj_at_addr(which);
364 }
366 // A "pseudo-string" is an non-string oop that has found is way into
367 // a String entry.
368 // Under AnonymousClasses this can happen if the user patches a live
369 // object into a CONSTANT_String entry of an anonymous class.
370 // Method oops internally created for method handles may also
371 // use pseudo-strings to link themselves to related metaobjects.
373 bool is_pseudo_string_at(int which);
375 oop pseudo_string_at(int which) {
376 assert(tag_at(which).is_string(), "Corrupted constant pool");
377 return *obj_at_addr(which);
378 }
380 void pseudo_string_at_put(int which, oop x) {
381 assert(AnonymousClasses, "");
382 set_pseudo_string(); // mark header
383 assert(tag_at(which).is_string() || tag_at(which).is_unresolved_string(), "Corrupted constant pool");
384 string_at_put(which, x); // this works just fine
385 }
387 // only called when we are sure a string entry is already resolved (via an
388 // earlier string_at call.
389 oop resolved_string_at(int which) {
390 assert(tag_at(which).is_string(), "Corrupted constant pool");
391 // Must do an acquire here in case another thread resolved the klass
392 // behind our back, lest we later load stale values thru the oop.
393 return (oop)OrderAccess::load_ptr_acquire(obj_at_addr(which));
394 }
396 // This method should only be used with a cpool lock or during parsing or gc
397 symbolOop unresolved_string_at(int which) { // Temporary until actual use
398 symbolOop s = symbolOop((oop)OrderAccess::load_ptr_acquire(obj_at_addr(which)));
399 // check that the string is still unresolved.
400 assert(tag_at(which).is_unresolved_string(), "Corrupted constant pool");
401 return s;
402 }
404 // Returns an UTF8 for a CONSTANT_String entry at a given index.
405 // UTF8 char* representation was chosen to avoid conversion of
406 // java_lang_Strings at resolved entries into symbolOops
407 // or vice versa.
408 // Caller is responsible for checking for pseudo-strings.
409 char* string_at_noresolve(int which);
411 jint name_and_type_at(int which) {
412 assert(tag_at(which).is_name_and_type(), "Corrupted constant pool");
413 return *int_at_addr(which);
414 }
416 int method_handle_ref_kind_at(int which) {
417 assert(tag_at(which).is_method_handle(), "Corrupted constant pool");
418 return extract_low_short_from_int(*int_at_addr(which)); // mask out unwanted ref_index bits
419 }
420 int method_handle_index_at(int which) {
421 assert(tag_at(which).is_method_handle(), "Corrupted constant pool");
422 return extract_high_short_from_int(*int_at_addr(which)); // shift out unwanted ref_kind bits
423 }
424 int method_type_index_at(int which) {
425 assert(tag_at(which).is_method_type(), "Corrupted constant pool");
426 return *int_at_addr(which);
427 }
428 // Derived queries:
429 symbolOop method_handle_name_ref_at(int which) {
430 int member = method_handle_index_at(which);
431 return impl_name_ref_at(member, true);
432 }
433 symbolOop method_handle_signature_ref_at(int which) {
434 int member = method_handle_index_at(which);
435 return impl_signature_ref_at(member, true);
436 }
437 int method_handle_klass_index_at(int which) {
438 int member = method_handle_index_at(which);
439 return impl_klass_ref_index_at(member, true);
440 }
441 symbolOop method_type_signature_at(int which) {
442 int sym = method_type_index_at(which);
443 return symbol_at(sym);
444 }
446 private:
447 // some nodes (InvokeDynamic) have a variable number of operands, each a u2 value
448 enum { _multi_operand_count_offset = -1,
449 _multi_operand_base_offset = 0,
450 _multi_operand_buffer_fill_pointer_offset = 0 // shared at front of operands array
451 };
452 int multi_operand_buffer_length() {
453 return operands() == NULL ? 0 : operands()->length();
454 }
455 int multi_operand_buffer_fill_pointer() {
456 return operands() == NULL
457 ? _multi_operand_buffer_fill_pointer_offset + 1
458 : operands()->int_at(_multi_operand_buffer_fill_pointer_offset);
459 }
460 void multi_operand_buffer_grow(int min_length, TRAPS);
461 void set_multi_operand_buffer_fill_pointer(int fillp) {
462 assert(operands() != NULL, "");
463 operands()->int_at_put(_multi_operand_buffer_fill_pointer_offset, fillp);
464 }
465 int multi_operand_base_at(int which) {
466 assert(tag_at(which).is_invoke_dynamic(), "Corrupted constant pool");
467 int op_base = *int_at_addr(which);
468 assert(op_base > _multi_operand_buffer_fill_pointer_offset, "Corrupted operand base");
469 return op_base;
470 }
471 int multi_operand_count_at(int which) {
472 int op_base = multi_operand_base_at(which);
473 assert((uint)(op_base + _multi_operand_count_offset) < (uint)operands()->length(), "oob");
474 int count = operands()->int_at(op_base + _multi_operand_count_offset);
475 return count;
476 }
477 int multi_operand_ref_at(int which, int i) {
478 int op_base = multi_operand_base_at(which);
479 assert((uint)i < (uint)multi_operand_count_at(which), "oob");
480 assert((uint)(op_base + _multi_operand_base_offset + i) < (uint)operands()->length(), "oob");
481 return operands()->int_at(op_base + _multi_operand_base_offset + i);
482 }
483 void set_multi_operand_ref_at(int which, int i, int ref) {
484 DEBUG_ONLY(multi_operand_ref_at(which, i)); // trigger asserts
485 int op_base = multi_operand_base_at(which);
486 operands()->int_at_put(op_base + _multi_operand_base_offset + i, ref);
487 }
489 public:
490 // layout of InvokeDynamic:
491 enum {
492 _indy_bsm_offset = 0, // CONSTANT_MethodHandle bsm
493 _indy_nt_offset = 1, // CONSTANT_NameAndType descr
494 _indy_argc_offset = 2, // u2 argc
495 _indy_argv_offset = 3 // u2 argv[argc]
496 };
497 int invoke_dynamic_bootstrap_method_ref_index_at(int which) {
498 assert(tag_at(which).is_invoke_dynamic(), "Corrupted constant pool");
499 return multi_operand_ref_at(which, _indy_bsm_offset);
500 }
501 int invoke_dynamic_name_and_type_ref_index_at(int which) {
502 assert(tag_at(which).is_invoke_dynamic(), "Corrupted constant pool");
503 return multi_operand_ref_at(which, _indy_nt_offset);
504 }
505 int invoke_dynamic_argument_count_at(int which) {
506 assert(tag_at(which).is_invoke_dynamic(), "Corrupted constant pool");
507 int argc = multi_operand_ref_at(which, _indy_argc_offset);
508 DEBUG_ONLY(int op_count = multi_operand_count_at(which));
509 assert(_indy_argv_offset + argc == op_count, "consistent inner and outer counts");
510 return argc;
511 }
512 int invoke_dynamic_argument_index_at(int which, int j) {
513 assert((uint)j < (uint)invoke_dynamic_argument_count_at(which), "oob");
514 return multi_operand_ref_at(which, _indy_argv_offset + j);
515 }
517 // The following methods (name/signature/klass_ref_at, klass_ref_at_noresolve,
518 // name_and_type_ref_index_at) all expect to be passed indices obtained
519 // directly from the bytecode.
520 // If the indices are meant to refer to fields or methods, they are
521 // actually rewritten constant pool cache indices.
522 // The routine remap_instruction_operand_from_cache manages the adjustment
523 // of these values back to constant pool indices.
525 // There are also "uncached" versions which do not adjust the operand index; see below.
527 // FIXME: Consider renaming these with a prefix "cached_" to make the distinction clear.
528 // In a few cases (the verifier) there are uses before a cpcache has been built,
529 // which are handled by a dynamic check in remap_instruction_operand_from_cache.
530 // FIXME: Remove the dynamic check, and adjust all callers to specify the correct mode.
532 // Lookup for entries consisting of (klass_index, name_and_type index)
533 klassOop klass_ref_at(int which, TRAPS);
534 symbolOop klass_ref_at_noresolve(int which);
535 symbolOop name_ref_at(int which) { return impl_name_ref_at(which, false); }
536 symbolOop signature_ref_at(int which) { return impl_signature_ref_at(which, false); }
538 int klass_ref_index_at(int which) { return impl_klass_ref_index_at(which, false); }
539 int name_and_type_ref_index_at(int which) { return impl_name_and_type_ref_index_at(which, false); }
541 // Lookup for entries consisting of (name_index, signature_index)
542 int name_ref_index_at(int which_nt); // == low-order jshort of name_and_type_at(which_nt)
543 int signature_ref_index_at(int which_nt); // == high-order jshort of name_and_type_at(which_nt)
545 BasicType basic_type_for_signature_at(int which);
547 // Resolve string constants (to prevent allocation during compilation)
548 void resolve_string_constants(TRAPS) {
549 constantPoolHandle h_this(THREAD, this);
550 resolve_string_constants_impl(h_this, CHECK);
551 }
553 private:
554 enum { _no_index_sentinel = -1, _possible_index_sentinel = -2 };
555 public:
557 // Resolve late bound constants.
558 oop resolve_constant_at(int index, TRAPS) {
559 constantPoolHandle h_this(THREAD, this);
560 return resolve_constant_at_impl(h_this, index, _no_index_sentinel, THREAD);
561 }
563 oop resolve_cached_constant_at(int cache_index, TRAPS) {
564 constantPoolHandle h_this(THREAD, this);
565 return resolve_constant_at_impl(h_this, _no_index_sentinel, cache_index, THREAD);
566 }
568 oop resolve_possibly_cached_constant_at(int pool_index, TRAPS) {
569 constantPoolHandle h_this(THREAD, this);
570 return resolve_constant_at_impl(h_this, pool_index, _possible_index_sentinel, THREAD);
571 }
573 // Klass name matches name at offset
574 bool klass_name_at_matches(instanceKlassHandle k, int which);
576 // Sizing
577 int length() const { return _length; }
578 void set_length(int length) { _length = length; }
580 // Tells whether index is within bounds.
581 bool is_within_bounds(int index) const {
582 return 0 <= index && index < length();
583 }
585 static int header_size() { return sizeof(constantPoolOopDesc)/HeapWordSize; }
586 static int object_size(int length) { return align_object_size(header_size() + length); }
587 int object_size() { return object_size(length()); }
589 bool is_conc_safe() { return _is_conc_safe; }
590 void set_is_conc_safe(bool v) { _is_conc_safe = v; }
592 friend class constantPoolKlass;
593 friend class ClassFileParser;
594 friend class SystemDictionary;
596 // Used by compiler to prevent classloading.
597 static klassOop klass_at_if_loaded (constantPoolHandle this_oop, int which);
598 static klassOop klass_ref_at_if_loaded (constantPoolHandle this_oop, int which);
599 // Same as above - but does LinkResolving.
600 static klassOop klass_ref_at_if_loaded_check(constantPoolHandle this_oop, int which, TRAPS);
602 // Routines currently used for annotations (only called by jvm.cpp) but which might be used in the
603 // future by other Java code. These take constant pool indices rather than
604 // constant pool cache indices as do the peer methods above.
605 symbolOop uncached_klass_ref_at_noresolve(int which);
606 symbolOop uncached_name_ref_at(int which) { return impl_name_ref_at(which, true); }
607 symbolOop uncached_signature_ref_at(int which) { return impl_signature_ref_at(which, true); }
608 int uncached_klass_ref_index_at(int which) { return impl_klass_ref_index_at(which, true); }
609 int uncached_name_and_type_ref_index_at(int which) { return impl_name_and_type_ref_index_at(which, true); }
611 // Sharing
612 int pre_resolve_shared_klasses(TRAPS);
613 void shared_symbols_iterate(OopClosure* closure0);
614 void shared_tags_iterate(OopClosure* closure0);
615 void shared_strings_iterate(OopClosure* closure0);
617 // Debugging
618 const char* printable_name_at(int which) PRODUCT_RETURN0;
620 #ifdef ASSERT
621 enum { CPCACHE_INDEX_TAG = 0x10000 }; // helps keep CP cache indices distinct from CP indices
622 #else
623 enum { CPCACHE_INDEX_TAG = 0 }; // in product mode, this zero value is a no-op
624 #endif //ASSERT
626 private:
628 symbolOop impl_name_ref_at(int which, bool uncached);
629 symbolOop impl_signature_ref_at(int which, bool uncached);
630 int impl_klass_ref_index_at(int which, bool uncached);
631 int impl_name_and_type_ref_index_at(int which, bool uncached);
633 int remap_instruction_operand_from_cache(int operand); // operand must be biased by CPCACHE_INDEX_TAG
635 // Used while constructing constant pool (only by ClassFileParser)
636 jint klass_index_at(int which) {
637 assert(tag_at(which).is_klass_index(), "Corrupted constant pool");
638 return *int_at_addr(which);
639 }
641 jint string_index_at(int which) {
642 assert(tag_at(which).is_string_index(), "Corrupted constant pool");
643 return *int_at_addr(which);
644 }
646 // Performs the LinkResolver checks
647 static void verify_constant_pool_resolve(constantPoolHandle this_oop, KlassHandle klass, TRAPS);
649 // Implementation of methods that needs an exposed 'this' pointer, in order to
650 // handle GC while executing the method
651 static klassOop klass_at_impl(constantPoolHandle this_oop, int which, TRAPS);
652 static oop string_at_impl(constantPoolHandle this_oop, int which, TRAPS);
654 // Resolve string constants (to prevent allocation during compilation)
655 static void resolve_string_constants_impl(constantPoolHandle this_oop, TRAPS);
657 static oop resolve_constant_at_impl(constantPoolHandle this_oop, int index, int cache_index, TRAPS);
659 public:
660 // Merging constantPoolOop support:
661 bool compare_entry_to(int index1, constantPoolHandle cp2, int index2, TRAPS);
662 void copy_cp_to(int start_i, int end_i, constantPoolHandle to_cp, int to_i,
663 TRAPS);
664 void copy_entry_to(int from_i, constantPoolHandle to_cp, int to_i, TRAPS);
665 int find_matching_entry(int pattern_i, constantPoolHandle search_cp, TRAPS);
666 int orig_length() const { return _orig_length; }
667 void set_orig_length(int orig_length) { _orig_length = orig_length; }
670 // JVMTI accesss - GetConstantPool, RetransformClasses, ...
671 friend class JvmtiConstantPoolReconstituter;
673 private:
674 jint cpool_entry_size(jint idx);
675 jint hash_entries_to(SymbolHashMap *symmap, SymbolHashMap *classmap);
677 // Copy cpool bytes into byte array.
678 // Returns:
679 // int > 0, count of the raw cpool bytes that have been copied
680 // 0, OutOfMemory error
681 // -1, Internal error
682 int copy_cpool_bytes(int cpool_size,
683 SymbolHashMap* tbl,
684 unsigned char *bytes);
685 };
687 class SymbolHashMapEntry : public CHeapObj {
688 private:
689 unsigned int _hash; // 32-bit hash for item
690 SymbolHashMapEntry* _next; // Next element in the linked list for this bucket
691 symbolOop _symbol; // 1-st part of the mapping: symbol => value
692 u2 _value; // 2-nd part of the mapping: symbol => value
694 public:
695 unsigned int hash() const { return _hash; }
696 void set_hash(unsigned int hash) { _hash = hash; }
698 SymbolHashMapEntry* next() const { return _next; }
699 void set_next(SymbolHashMapEntry* next) { _next = next; }
701 symbolOop symbol() const { return _symbol; }
702 void set_symbol(symbolOop sym) { _symbol = sym; }
704 u2 value() const { return _value; }
705 void set_value(u2 value) { _value = value; }
707 SymbolHashMapEntry(unsigned int hash, symbolOop symbol, u2 value)
708 : _hash(hash), _symbol(symbol), _value(value), _next(NULL) {}
710 }; // End SymbolHashMapEntry class
713 class SymbolHashMapBucket : public CHeapObj {
715 private:
716 SymbolHashMapEntry* _entry;
718 public:
719 SymbolHashMapEntry* entry() const { return _entry; }
720 void set_entry(SymbolHashMapEntry* entry) { _entry = entry; }
721 void clear() { _entry = NULL; }
723 }; // End SymbolHashMapBucket class
726 class SymbolHashMap: public CHeapObj {
728 private:
729 // Default number of entries in the table
730 enum SymbolHashMap_Constants {
731 _Def_HashMap_Size = 256
732 };
734 int _table_size;
735 SymbolHashMapBucket* _buckets;
737 void initialize_table(int table_size) {
738 _table_size = table_size;
739 _buckets = NEW_C_HEAP_ARRAY(SymbolHashMapBucket, table_size);
740 for (int index = 0; index < table_size; index++) {
741 _buckets[index].clear();
742 }
743 }
745 public:
747 int table_size() const { return _table_size; }
749 SymbolHashMap() { initialize_table(_Def_HashMap_Size); }
750 SymbolHashMap(int table_size) { initialize_table(table_size); }
752 // hash P(31) from Kernighan & Ritchie
753 static unsigned int compute_hash(const char* str, int len) {
754 unsigned int hash = 0;
755 while (len-- > 0) {
756 hash = 31*hash + (unsigned) *str;
757 str++;
758 }
759 return hash;
760 }
762 SymbolHashMapEntry* bucket(int i) {
763 return _buckets[i].entry();
764 }
766 void add_entry(symbolOop sym, u2 value);
767 SymbolHashMapEntry* find_entry(symbolOop sym);
769 u2 symbol_to_value(symbolOop sym) {
770 SymbolHashMapEntry *entry = find_entry(sym);
771 return (entry == NULL) ? 0 : entry->value();
772 }
774 ~SymbolHashMap() {
775 SymbolHashMapEntry* next;
776 for (int i = 0; i < _table_size; i++) {
777 for (SymbolHashMapEntry* cur = bucket(i); cur != NULL; cur = next) {
778 next = cur->next();
779 delete(cur);
780 }
781 }
782 delete _buckets;
783 }
784 }; // End SymbolHashMap class
786 #endif // SHARE_VM_OOPS_CONSTANTPOOLOOP_HPP