rev 48017 : [mq]: Access_strings

   1 /*
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   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
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  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
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  24 
  25 #ifndef SHARE_VM_CLASSFILE_JAVACLASSES_INLINE_HPP
  26 #define SHARE_VM_CLASSFILE_JAVACLASSES_INLINE_HPP
  27 
  28 #include "classfile/javaClasses.hpp"
  29 #include "oops/access.inline.hpp"
  30 #include "oops/oop.inline.hpp"
  31 #include "oops/oopsHierarchy.hpp"
  32 
  33 void java_lang_String::set_coder(oop string, jbyte coder) {
  34   assert(initialized && (coder_offset > 0), "Must be initialized");
  35   string->byte_field_put(coder_offset, coder);
  36 }
  37 
  38 void java_lang_String::set_value_raw(oop string, typeArrayOop buffer) {
  39   assert(initialized, "Must be initialized");
  40   string->obj_field_put_raw(value_offset, buffer);
  41 }
  42 void java_lang_String::set_value(oop string, typeArrayOop buffer) {
  43   assert(initialized && (value_offset > 0), "Must be initialized");
  44   string->obj_field_put(value_offset, (oop)buffer);
  45 }
  46 void java_lang_String::set_hash(oop string, unsigned int hash) {
  47   assert(initialized && (hash_offset > 0), "Must be initialized");
  48   string->int_field_put(hash_offset, hash);
  49 }
  50 
  51 // Accessors
  52 typeArrayOop java_lang_String::value(oop java_string) {
  53   assert(initialized && (value_offset > 0), "Must be initialized");
  54   assert(is_instance(java_string), "must be java_string");
  55   return (typeArrayOop) java_string->obj_field(value_offset);
  56 }
  57 typeArrayOop java_lang_String::value_no_keepalive(oop java_string) {
  58   assert(initialized && (value_offset > 0), "Must be initialized");
  59   assert(is_instance(java_string), "must be java_string");
  60   oop value = HeapAccess<AS_NO_KEEPALIVE>::oop_load_at(java_string, value_offset);
  61   return (typeArrayOop)value;
  62 }
  63 unsigned int java_lang_String::hash(oop java_string) {
  64   assert(initialized && (hash_offset > 0), "Must be initialized");
  65   assert(is_instance(java_string), "must be java_string");
  66   return java_string->int_field(hash_offset);
  67 }
  68 bool java_lang_String::is_latin1(oop java_string) {
  69   assert(initialized && (coder_offset > 0), "Must be initialized");
  70   assert(is_instance(java_string), "must be java_string");
  71   jbyte coder = java_string->byte_field(coder_offset);
  72   assert(CompactStrings || coder == CODER_UTF16, "Must be UTF16 without CompactStrings");
  73   return coder == CODER_LATIN1;
  74 }
  75 int java_lang_String::length(oop java_string) {
  76   typeArrayOop value = java_lang_String::value_no_keepalive(java_string);
  77   assert(initialized, "Must be initialized");
  78   assert(is_instance(java_string), "must be java_string");
  79   if (value == NULL) {

  80     return 0;
  81   }
  82   int arr_length = value->length();
  83   if (!is_latin1(java_string)) {
  84     assert((arr_length & 1) == 0, "should be even for UTF16 string");
  85     arr_length >>= 1; // convert number of bytes to number of elements
  86   }
  87   return arr_length;
  88 }
  89 
  90 bool java_lang_String::is_instance_inlined(oop obj) {
  91   return obj != NULL && obj->klass() == SystemDictionary::String_klass();
  92 }
  93 
  94 // Accessors
  95 oop java_lang_ref_Reference::referent(oop ref) {
  96   return ref->obj_field(referent_offset);
  97 }
  98 void java_lang_ref_Reference::set_referent(oop ref, oop value) {
  99   ref->obj_field_put(referent_offset, value);
 100 }
 101 void java_lang_ref_Reference::set_referent_raw(oop ref, oop value) {
 102   ref->obj_field_put_raw(referent_offset, value);
 103 }
 104 HeapWord* java_lang_ref_Reference::referent_addr(oop ref) {
 105   return ref->obj_field_addr<HeapWord>(referent_offset);
 106 }
 107 oop java_lang_ref_Reference::next(oop ref) {
 108   return ref->obj_field(next_offset);
 109 }
 110 void java_lang_ref_Reference::set_next(oop ref, oop value) {
 111   ref->obj_field_put(next_offset, value);
 112 }
 113 void java_lang_ref_Reference::set_next_raw(oop ref, oop value) {
 114   ref->obj_field_put_raw(next_offset, value);
 115 }
 116 HeapWord* java_lang_ref_Reference::next_addr(oop ref) {
 117   return ref->obj_field_addr<HeapWord>(next_offset);
 118 }
 119 oop java_lang_ref_Reference::discovered(oop ref) {
 120   return ref->obj_field(discovered_offset);
 121 }
 122 void java_lang_ref_Reference::set_discovered(oop ref, oop value) {
 123   ref->obj_field_put(discovered_offset, value);
 124 }
 125 void java_lang_ref_Reference::set_discovered_raw(oop ref, oop value) {
 126   ref->obj_field_put_raw(discovered_offset, value);
 127 }
 128 HeapWord* java_lang_ref_Reference::discovered_addr(oop ref) {
 129   return ref->obj_field_addr<HeapWord>(discovered_offset);
 130 }
 131 bool java_lang_ref_Reference::is_phantom(oop ref) {
 132   return InstanceKlass::cast(ref->klass())->reference_type() == REF_PHANTOM;
 133 }
 134 
 135 inline void java_lang_invoke_CallSite::set_target_volatile(oop site, oop target) {
 136   site->obj_field_put_volatile(_target_offset, target);
 137 }
 138 
 139 inline oop  java_lang_invoke_CallSite::target(oop site) {
 140   return site->obj_field(_target_offset);
 141 }
 142 
 143 inline void java_lang_invoke_CallSite::set_target(oop site, oop target) {
 144   site->obj_field_put(_target_offset, target);
 145 }
 146 
 147 inline bool java_lang_invoke_CallSite::is_instance(oop obj) {
 148   return obj != NULL && is_subclass(obj->klass());
 149 }
 150 
 151 inline bool java_lang_invoke_MethodHandleNatives_CallSiteContext::is_instance(oop obj) {
 152   return obj != NULL && is_subclass(obj->klass());
 153 }
 154 
 155 inline bool java_lang_invoke_MemberName::is_instance(oop obj) {
 156   return obj != NULL && obj->klass() == SystemDictionary::MemberName_klass();
 157 }
 158 
 159 inline bool java_lang_invoke_ResolvedMethodName::is_instance(oop obj) {
 160   return obj != NULL && obj->klass() == SystemDictionary::ResolvedMethodName_klass();
 161 }
 162 
 163 inline bool java_lang_invoke_MethodType::is_instance(oop obj) {
 164   return obj != NULL && obj->klass() == SystemDictionary::MethodType_klass();
 165 }
 166 
 167 inline bool java_lang_invoke_MethodHandle::is_instance(oop obj) {
 168   return obj != NULL && is_subclass(obj->klass());
 169 }
 170 
 171 inline bool java_lang_Class::is_instance(oop obj) {
 172   return obj != NULL && obj->klass() == SystemDictionary::Class_klass();
 173 }
 174 
 175 inline bool java_lang_invoke_DirectMethodHandle::is_instance(oop obj) {
 176   return obj != NULL && is_subclass(obj->klass());
 177 }
 178 
 179 inline bool java_lang_Module::is_instance(oop obj) {
 180   return obj != NULL && obj->klass() == SystemDictionary::Module_klass();
 181 }
 182 
 183 inline int Backtrace::merge_bci_and_version(int bci, int version) {
 184   // only store u2 for version, checking for overflow.
 185   if (version > USHRT_MAX || version < 0) version = USHRT_MAX;
 186   assert((jushort)bci == bci, "bci should be short");
 187   return build_int_from_shorts(version, bci);
 188 }
 189 
 190 inline int Backtrace::merge_mid_and_cpref(int mid, int cpref) {
 191   // only store u2 for mid and cpref, checking for overflow.
 192   assert((jushort)mid == mid, "mid should be short");
 193   assert((jushort)cpref == cpref, "cpref should be short");
 194   return build_int_from_shorts(cpref, mid);
 195 }
 196 
 197 inline int Backtrace::bci_at(unsigned int merged) {
 198   return extract_high_short_from_int(merged);
 199 }
 200 
 201 inline int Backtrace::version_at(unsigned int merged) {
 202   return extract_low_short_from_int(merged);
 203 }
 204 
 205 inline int Backtrace::mid_at(unsigned int merged) {
 206   return extract_high_short_from_int(merged);
 207 }
 208 
 209 inline int Backtrace::cpref_at(unsigned int merged) {
 210   return extract_low_short_from_int(merged);
 211 }
 212 
 213 inline int Backtrace::get_line_number(const methodHandle& method, int bci) {
 214   int line_number = 0;
 215   if (method->is_native()) {
 216     // Negative value different from -1 below, enabling Java code in
 217     // class java.lang.StackTraceElement to distinguish "native" from
 218     // "no LineNumberTable".  JDK tests for -2.
 219     line_number = -2;
 220   } else {
 221     // Returns -1 if no LineNumberTable, and otherwise actual line number
 222     line_number = method->line_number_from_bci(bci);
 223     if (line_number == -1 && ShowHiddenFrames) {
 224       line_number = bci + 1000000;
 225     }
 226   }
 227   return line_number;
 228 }
 229 
 230 inline Symbol* Backtrace::get_source_file_name(InstanceKlass* holder, int version) {
 231   // RedefineClasses() currently permits redefine operations to
 232   // happen in parallel using a "last one wins" philosophy. That
 233   // spec laxness allows the constant pool entry associated with
 234   // the source_file_name_index for any older constant pool version
 235   // to be unstable so we shouldn't try to use it.
 236   if (holder->constants()->version() != version) {
 237     return NULL;
 238   } else {
 239     return holder->source_file_name();
 240   }
 241 }
 242 
 243 #endif // SHARE_VM_CLASSFILE_JAVACLASSES_INLINE_HPP
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