jdk8-mips64-public/hotspot: src/share/vm/prims/jvmtiClassFileReconstituter.cpp@710a3c8b516e

     1 /*

     2  * Copyright (c) 2005, 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 #include "precompiled.hpp"

    32 #include "classfile/symbolTable.hpp"

    33 #include "interpreter/bytecodeStream.hpp"

    34 #include "oops/fieldStreams.hpp"

    35 #include "prims/jvmtiClassFileReconstituter.hpp"

    36 #include "runtime/signature.hpp"

    37 #ifdef TARGET_ARCH_x86

    38 # include "bytes_x86.hpp"

    39 #endif

    40 #ifdef TARGET_ARCH_sparc

    41 # include "bytes_sparc.hpp"

    42 #endif

    43 #ifdef TARGET_ARCH_zero

    44 # include "bytes_zero.hpp"

    45 #endif

    46 #ifdef TARGET_ARCH_arm

    47 # include "bytes_arm.hpp"

    48 #endif

    49 #ifdef TARGET_ARCH_ppc

    50 # include "bytes_ppc.hpp"

    51 #endif

    52 #ifdef TARGET_ARCH_mips

    53 # include "bytes_mips.hpp"

    54 #endif

    55 // FIXME: add Deprecated attribute

    56 // FIXME: fix Synthetic attribute

    57 // FIXME: per Serguei, add error return handling for ConstantPool::copy_cpool_bytes()

    60 // Write the field information portion of ClassFile structure

    61 // JVMSpec|     u2 fields_count;

    62 // JVMSpec|     field_info fields[fields_count];

    63 void JvmtiClassFileReconstituter::write_field_infos() {

    64   HandleMark hm(thread());

    65   Array<AnnotationArray*>* fields_anno = ikh()->fields_annotations();

    67   // Compute the real number of Java fields

    68   int java_fields = ikh()->java_fields_count();

    70   write_u2(java_fields);

    71   for (JavaFieldStream fs(ikh()); !fs.done(); fs.next()) {

    72     AccessFlags access_flags = fs.access_flags();

    73     int name_index = fs.name_index();

    74     int signature_index = fs.signature_index();

    75     int initial_value_index = fs.initval_index();

    76     guarantee(name_index != 0 && signature_index != 0, "bad constant pool index for field");

    77     // int offset = ikh()->field_offset( index );

    78     int generic_signature_index = fs.generic_signature_index();

    79     AnnotationArray* anno = fields_anno == NULL ? NULL : fields_anno->at(fs.index());

    81     // JVMSpec|   field_info {

    82     // JVMSpec|         u2 access_flags;

    83     // JVMSpec|         u2 name_index;

    84     // JVMSpec|         u2 descriptor_index;

    85     // JVMSpec|         u2 attributes_count;

    86     // JVMSpec|         attribute_info attributes[attributes_count];

    87     // JVMSpec|   }

    89     write_u2(access_flags.as_int() & JVM_RECOGNIZED_FIELD_MODIFIERS);

    90     write_u2(name_index);

    91     write_u2(signature_index);

    92     int attr_count = 0;

    93     if (initial_value_index != 0) {

    94       ++attr_count;

    95     }

    96     if (access_flags.is_synthetic()) {

    97       // ++attr_count;

    98     }

    99     if (generic_signature_index != 0) {

   100       ++attr_count;

   101     }

   102     if (anno != NULL) {

   103       ++attr_count;     // has RuntimeVisibleAnnotations attribute

   104     }

   106     write_u2(attr_count);

   108     if (initial_value_index != 0) {

   109       write_attribute_name_index("ConstantValue");

   110       write_u4(2); //length always 2

   111       write_u2(initial_value_index);

   112     }

   113     if (access_flags.is_synthetic()) {

   114       // write_synthetic_attribute();

   115     }

   116     if (generic_signature_index != 0) {

   117       write_signature_attribute(generic_signature_index);

   118     }

   119     if (anno != NULL) {

   120       write_annotations_attribute("RuntimeVisibleAnnotations", anno);

   121     }

   122   }

   123 }

   125 // Write Code attribute

   126 // JVMSpec|   Code_attribute {

   127 // JVMSpec|     u2 attribute_name_index;

   128 // JVMSpec|     u4 attribute_length;

   129 // JVMSpec|     u2 max_stack;

   130 // JVMSpec|     u2 max_locals;

   131 // JVMSpec|     u4 code_length;

   132 // JVMSpec|     u1 code[code_length];

   133 // JVMSpec|     u2 exception_table_length;

   134 // JVMSpec|     {       u2 start_pc;

   135 // JVMSpec|             u2 end_pc;

   136 // JVMSpec|             u2  handler_pc;

   137 // JVMSpec|             u2  catch_type;

   138 // JVMSpec|     }       exception_table[exception_table_length];

   139 // JVMSpec|     u2 attributes_count;

   140 // JVMSpec|     attribute_info attributes[attributes_count];

   141 // JVMSpec|   }

   142 void JvmtiClassFileReconstituter::write_code_attribute(methodHandle method) {

   143   ConstMethod* const_method = method->constMethod();

   144   u2 line_num_cnt = 0;

   145   int stackmap_len = 0;

   146   int local_variable_table_length = 0;

   147   int local_variable_type_table_length = 0;

   149   // compute number and length of attributes

   150   int attr_count = 0;

   151   int attr_size = 0;

   152   if (const_method->has_linenumber_table()) {

   153     line_num_cnt = line_number_table_entries(method);

   154     if (line_num_cnt != 0) {

   155       ++attr_count;

   156       // Compute the complete size of the line number table attribute:

   157       //      LineNumberTable_attribute {

   158       //        u2 attribute_name_index;

   159       //        u4 attribute_length;

   160       //        u2 line_number_table_length;

   161       //        {  u2 start_pc;

   162       //           u2 line_number;

   163       //        } line_number_table[line_number_table_length];

   164       //      }

   165       attr_size += 2 + 4 + 2 + line_num_cnt * (2 + 2);

   166     }

   167   }

   168   if (method->has_stackmap_table()) {

   169     stackmap_len = method->stackmap_data()->length();

   170     if (stackmap_len != 0) {

   171       ++attr_count;

   172       // Compute the  size of the stack map table attribute (VM stores raw):

   173       //      StackMapTable_attribute {

   174       //        u2 attribute_name_index;

   175       //        u4 attribute_length;

   176       //        u2 number_of_entries;

   177       //        stack_map_frame_entries[number_of_entries];

   178       //      }

   179       attr_size += 2 + 4 + stackmap_len;

   180     }

   181   }

   182   if (method->has_localvariable_table()) {

   183     local_variable_table_length = method->localvariable_table_length();

   184     if (local_variable_table_length != 0) {

   185       ++attr_count;

   186       // Compute the size of the local variable table attribute (VM stores raw):

   187       // LocalVariableTable_attribute {

   188       //   u2 attribute_name_index;

   189       //   u4 attribute_length;

   190       //   u2 local_variable_table_length;

   191       //   {

   192       //     u2 start_pc;

   193       //     u2 length;

   194       //     u2 name_index;

   195       //     u2 descriptor_index;

   196       //     u2 index;

   197       //   }

   198       attr_size += 2 + 4 + 2 + local_variable_table_length * (2 + 2 + 2 + 2 + 2);

   200       // Local variables with generic signatures must have LVTT entries

   201       LocalVariableTableElement *elem = method->localvariable_table_start();

   202       for (int idx = 0; idx < local_variable_table_length; idx++) {

   203         if (elem[idx].signature_cp_index != 0) {

   204           local_variable_type_table_length++;

   205         }

   206       }

   208       if (local_variable_type_table_length != 0) {

   209         ++attr_count;

   210         // Compute the size of the local variable type table attribute (VM stores raw):

   211         // LocalVariableTypeTable_attribute {

   212         //   u2 attribute_name_index;

   213         //   u4 attribute_length;

   214         //   u2 local_variable_type_table_length;

   215         //   {

   216         //     u2 start_pc;

   217         //     u2 length;

   218         //     u2 name_index;

   219         //     u2 signature_index;

   220         //     u2 index;

   221         //   }

   222         attr_size += 2 + 4 + 2 + local_variable_type_table_length * (2 + 2 + 2 + 2 + 2);

   223       }

   224     }

   225   }

   227   ExceptionTable exception_table(method());

   228   int exception_table_length = exception_table.length();

   229   int code_size = const_method->code_size();

   230   int size =

   231     2+2+4 +                                // max_stack, max_locals, code_length

   232     code_size +                            // code

   233     2 +                                    // exception_table_length

   234     (2+2+2+2) * exception_table_length +   // exception_table

   235     2 +                                    // attributes_count

   236     attr_size;                             // attributes

   238   write_attribute_name_index("Code");

   239   write_u4(size);

   240   write_u2(method->verifier_max_stack());

   241   write_u2(method->max_locals());

   242   write_u4(code_size);

   243   copy_bytecodes(method, (unsigned char*)writeable_address(code_size));

   244   write_u2(exception_table_length);

   245   for (int index = 0; index < exception_table_length; index++) {

   246     write_u2(exception_table.start_pc(index));

   247     write_u2(exception_table.end_pc(index));

   248     write_u2(exception_table.handler_pc(index));

   249     write_u2(exception_table.catch_type_index(index));

   250   }

   251   write_u2(attr_count);

   252   if (line_num_cnt != 0) {

   253     write_line_number_table_attribute(method, line_num_cnt);

   254   }

   255   if (stackmap_len != 0) {

   256     write_stackmap_table_attribute(method, stackmap_len);

   257   }

   258   if (local_variable_table_length != 0) {

   259     write_local_variable_table_attribute(method, local_variable_table_length);

   260   }

   261   if (local_variable_type_table_length != 0) {

   262     write_local_variable_type_table_attribute(method, local_variable_type_table_length);

   263   }

   264 }

   266 // Write Exceptions attribute

   267 // JVMSpec|   Exceptions_attribute {

   268 // JVMSpec|     u2 attribute_name_index;

   269 // JVMSpec|     u4 attribute_length;

   270 // JVMSpec|     u2 number_of_exceptions;

   271 // JVMSpec|     u2 exception_index_table[number_of_exceptions];

   272 // JVMSpec|   }

   273 void JvmtiClassFileReconstituter::write_exceptions_attribute(ConstMethod* const_method) {

   274   CheckedExceptionElement* checked_exceptions = const_method->checked_exceptions_start();

   275   int checked_exceptions_length = const_method->checked_exceptions_length();

   276   int size =

   277     2 +                                    // number_of_exceptions

   278     2 * checked_exceptions_length;         // exception_index_table

   280   write_attribute_name_index("Exceptions");

   281   write_u4(size);

   282   write_u2(checked_exceptions_length);

   283   for (int index = 0; index < checked_exceptions_length; index++) {

   284     write_u2(checked_exceptions[index].class_cp_index);

   285   }

   286 }

   288 // Write SourceFile attribute

   289 // JVMSpec|   SourceFile_attribute {

   290 // JVMSpec|     u2 attribute_name_index;

   291 // JVMSpec|     u4 attribute_length;

   292 // JVMSpec|     u2 sourcefile_index;

   293 // JVMSpec|   }

   294 void JvmtiClassFileReconstituter::write_source_file_attribute() {

   295   assert(ikh()->source_file_name() != NULL, "caller must check");

   297   write_attribute_name_index("SourceFile");

   298   write_u4(2);  // always length 2

   299   write_u2(symbol_to_cpool_index(ikh()->source_file_name()));

   300 }

   302 // Write SourceDebugExtension attribute

   303 // JSR45|   SourceDebugExtension_attribute {

   304 // JSR45|       u2 attribute_name_index;

   305 // JSR45|       u4 attribute_length;

   306 // JSR45|       u1 debug_extension[attribute_length];

   307 // JSR45|   }

   308 void JvmtiClassFileReconstituter::write_source_debug_extension_attribute() {

   309   assert(ikh()->source_debug_extension() != NULL, "caller must check");

   311   write_attribute_name_index("SourceDebugExtension");

   312   int len = (int)strlen(ikh()->source_debug_extension());

   313   write_u4(len);

   314   u1* ext = (u1*)ikh()->source_debug_extension();

   315   for (int i=0; i<len; i++) {

   316     write_u1(ext[i]);

   317   }

   318 }

   320 // Write (generic) Signature attribute

   321 // JVMSpec|   Signature_attribute {

   322 // JVMSpec|     u2 attribute_name_index;

   323 // JVMSpec|     u4 attribute_length;

   324 // JVMSpec|     u2 signature_index;

   325 // JVMSpec|   }

   326 void JvmtiClassFileReconstituter::write_signature_attribute(u2 generic_signature_index) {

   327   write_attribute_name_index("Signature");

   328   write_u4(2);  // always length 2

   329   write_u2(generic_signature_index);

   330 }

   332 // Compute the number of entries in the InnerClasses attribute

   333 u2 JvmtiClassFileReconstituter::inner_classes_attribute_length() {

   334   InnerClassesIterator iter(ikh());

   335   return iter.length();

   336 }

   338 // Write an annotation attribute.  The VM stores them in raw form, so all we need

   339 // to do is add the attrubute name and fill in the length.

   340 // JSR202|   *Annotations_attribute {

   341 // JSR202|     u2 attribute_name_index;

   342 // JSR202|     u4 attribute_length;

   343 // JSR202|     ...

   344 // JSR202|   }

   345 void JvmtiClassFileReconstituter::write_annotations_attribute(const char* attr_name,

   346                                                               AnnotationArray* annos) {

   347   u4 length = annos->length();

   348   write_attribute_name_index(attr_name);

   349   write_u4(length);

   350   memcpy(writeable_address(length), annos->adr_at(0), length);

   351 }

   353 //  BootstrapMethods_attribute {

   354 //    u2 attribute_name_index;

   355 //    u4 attribute_length;

   356 //    u2 num_bootstrap_methods;

   357 //    {   u2 bootstrap_method_ref;

   358 //        u2 num_bootstrap_arguments;

   359 //        u2 bootstrap_arguments[num_bootstrap_arguments];

   360 //    } bootstrap_methods[num_bootstrap_methods];

   361 //  }

   362 void JvmtiClassFileReconstituter::write_bootstrapmethod_attribute() {

   363   Array<u2>* operands = cpool()->operands();

   364   write_attribute_name_index("BootstrapMethods");

   365   int num_bootstrap_methods = ConstantPool::operand_array_length(operands);

   367   // calculate length of attribute

   368   int length = sizeof(u2); // num_bootstrap_methods

   369   for (int n = 0; n < num_bootstrap_methods; n++) {

   370     u2 num_bootstrap_arguments = cpool()->operand_argument_count_at(n);

   371     length += sizeof(u2); // bootstrap_method_ref

   372     length += sizeof(u2); // num_bootstrap_arguments

   373     length += sizeof(u2) * num_bootstrap_arguments; // bootstrap_arguments[num_bootstrap_arguments]

   374   }

   375   write_u4(length);

   377   // write attribute

   378   write_u2(num_bootstrap_methods);

   379   for (int n = 0; n < num_bootstrap_methods; n++) {

   380     u2 bootstrap_method_ref = cpool()->operand_bootstrap_method_ref_index_at(n);

   381     u2 num_bootstrap_arguments = cpool()->operand_argument_count_at(n);

   382     write_u2(bootstrap_method_ref);

   383     write_u2(num_bootstrap_arguments);

   384     for (int arg = 0; arg < num_bootstrap_arguments; arg++) {

   385       u2 bootstrap_argument = cpool()->operand_argument_index_at(n, arg);

   386       write_u2(bootstrap_argument);

   387     }

   388   }

   389 }

   392 // Write InnerClasses attribute

   393 // JVMSpec|   InnerClasses_attribute {

   394 // JVMSpec|     u2 attribute_name_index;

   395 // JVMSpec|     u4 attribute_length;

   396 // JVMSpec|     u2 number_of_classes;

   397 // JVMSpec|     {  u2 inner_class_info_index;

   398 // JVMSpec|        u2 outer_class_info_index;

   399 // JVMSpec|        u2 inner_name_index;

   400 // JVMSpec|        u2 inner_class_access_flags;

   401 // JVMSpec|     } classes[number_of_classes];

   402 // JVMSpec|   }

   403 void JvmtiClassFileReconstituter::write_inner_classes_attribute(int length) {

   404   InnerClassesIterator iter(ikh());

   405   guarantee(iter.length() != 0 && iter.length() == length,

   406             "caller must check");

   407   u2 entry_count = length / InstanceKlass::inner_class_next_offset;

   408   u4 size = 2 + entry_count * (2+2+2+2);

   410   write_attribute_name_index("InnerClasses");

   411   write_u4(size);

   412   write_u2(entry_count);

   413   for (; !iter.done(); iter.next()) {

   414     write_u2(iter.inner_class_info_index());

   415     write_u2(iter.outer_class_info_index());

   416     write_u2(iter.inner_name_index());

   417     write_u2(iter.inner_access_flags());

   418   }

   419 }

   421 // Write Synthetic attribute

   422 // JVMSpec|   Synthetic_attribute {

   423 // JVMSpec|     u2 attribute_name_index;

   424 // JVMSpec|     u4 attribute_length;

   425 // JVMSpec|   }

   426 void JvmtiClassFileReconstituter::write_synthetic_attribute() {

   427   write_attribute_name_index("Synthetic");

   428   write_u4(0); //length always zero

   429 }

   431 // Compute size of LineNumberTable

   432 u2 JvmtiClassFileReconstituter::line_number_table_entries(methodHandle method) {

   433   // The line number table is compressed so we don't know how big it is until decompressed.

   434   // Decompression is really fast so we just do it twice.

   435   u2 num_entries = 0;

   436   CompressedLineNumberReadStream stream(method->compressed_linenumber_table());

   437   while (stream.read_pair()) {

   438     num_entries++;

   439   }

   440   return num_entries;

   441 }

   443 // Write LineNumberTable attribute

   444 // JVMSpec|   LineNumberTable_attribute {

   445 // JVMSpec|     u2 attribute_name_index;

   446 // JVMSpec|     u4 attribute_length;

   447 // JVMSpec|     u2 line_number_table_length;

   448 // JVMSpec|     {  u2 start_pc;

   449 // JVMSpec|        u2 line_number;

   450 // JVMSpec|     } line_number_table[line_number_table_length];

   451 // JVMSpec|   }

   452 void JvmtiClassFileReconstituter::write_line_number_table_attribute(methodHandle method,

   453                                                                     u2 num_entries) {

   455   write_attribute_name_index("LineNumberTable");

   456   write_u4(2 + num_entries * (2 + 2));

   457   write_u2(num_entries);

   459   CompressedLineNumberReadStream stream(method->compressed_linenumber_table());

   460   while (stream.read_pair()) {

   461     write_u2(stream.bci());

   462     write_u2(stream.line());

   463   }

   464 }

   466 // Write LocalVariableTable attribute

   467 // JVMSpec|   LocalVariableTable_attribute {

   468 // JVMSpec|     u2 attribute_name_index;

   469 // JVMSpec|     u4 attribute_length;

   470 // JVMSpec|     u2 local_variable_table_length;

   471 // JVMSpec|     {  u2 start_pc;

   472 // JVMSpec|       u2 length;

   473 // JVMSpec|       u2 name_index;

   474 // JVMSpec|       u2 descriptor_index;

   475 // JVMSpec|       u2 index;

   476 // JVMSpec|     } local_variable_table[local_variable_table_length];

   477 // JVMSpec|   }

   478 void JvmtiClassFileReconstituter::write_local_variable_table_attribute(methodHandle method, u2 num_entries) {

   479     write_attribute_name_index("LocalVariableTable");

   480     write_u4(2 + num_entries * (2 + 2 + 2 + 2 + 2));

   481     write_u2(num_entries);

   483     assert(method->localvariable_table_length() == num_entries, "just checking");

   485     LocalVariableTableElement *elem = method->localvariable_table_start();

   486     for (int j=0; j<method->localvariable_table_length(); j++) {

   487       write_u2(elem->start_bci);

   488       write_u2(elem->length);

   489       write_u2(elem->name_cp_index);

   490       write_u2(elem->descriptor_cp_index);

   491       write_u2(elem->slot);

   492       elem++;

   493     }

   494 }

   496 // Write LocalVariableTypeTable attribute

   497 // JVMSpec|   LocalVariableTypeTable_attribute {

   498 // JVMSpec|     u2 attribute_name_index;

   499 // JVMSpec|     u4 attribute_length;

   500 // JVMSpec|     u2 local_variable_type_table_length;

   501 // JVMSpec|     { u2 start_pc;

   502 // JVMSpec|       u2 length;

   503 // JVMSpec|       u2 name_index;

   504 // JVMSpec|       u2 signature_index;

   505 // JVMSpec|       u2 index;

   506 // JVMSpec|     } local_variable_type_table[local_variable_type_table_length];

   507 // JVMSpec|   }

   508 void JvmtiClassFileReconstituter::write_local_variable_type_table_attribute(methodHandle method, u2 num_entries) {

   509     write_attribute_name_index("LocalVariableTypeTable");

   510     write_u4(2 + num_entries * (2 + 2 + 2 + 2 + 2));

   511     write_u2(num_entries);

   513     LocalVariableTableElement *elem = method->localvariable_table_start();

   514     for (int j=0; j<method->localvariable_table_length(); j++) {

   515       if (elem->signature_cp_index > 0) {

   516         // Local variable has a generic signature - write LVTT attribute entry

   517         write_u2(elem->start_bci);

   518         write_u2(elem->length);

   519         write_u2(elem->name_cp_index);

   520         write_u2(elem->signature_cp_index);

   521         write_u2(elem->slot);

   522         num_entries--;

   523       }

   524       elem++;

   525     }

   526     assert(num_entries == 0, "just checking");

   527 }

   529 // Write stack map table attribute

   530 // JSR-202|   StackMapTable_attribute {

   531 // JSR-202|     u2 attribute_name_index;

   532 // JSR-202|     u4 attribute_length;

   533 // JSR-202|     u2 number_of_entries;

   534 // JSR-202|     stack_map_frame_entries[number_of_entries];

   535 // JSR-202|   }

   536 void JvmtiClassFileReconstituter::write_stackmap_table_attribute(methodHandle method,

   537                                                                  int stackmap_len) {

   539   write_attribute_name_index("StackMapTable");

   540   write_u4(stackmap_len);

   541   memcpy(

   542     writeable_address(stackmap_len),

   543     (void*)(method->stackmap_data()->adr_at(0)),

   544     stackmap_len);

   545 }

   547 // Write one method_info structure

   548 // JVMSpec|   method_info {

   549 // JVMSpec|     u2 access_flags;

   550 // JVMSpec|     u2 name_index;

   551 // JVMSpec|     u2 descriptor_index;

   552 // JVMSpec|     u2 attributes_count;

   553 // JVMSpec|     attribute_info attributes[attributes_count];

   554 // JVMSpec|   }

   555 void JvmtiClassFileReconstituter::write_method_info(methodHandle method) {

   556   AccessFlags access_flags = method->access_flags();

   557   ConstMethod* const_method = method->constMethod();

   558   u2 generic_signature_index = const_method->generic_signature_index();

   559   AnnotationArray* anno = method->annotations();

   560   AnnotationArray* param_anno = method->parameter_annotations();

   561   AnnotationArray* default_anno = method->annotation_default();

   563   // skip generated default interface methods

   564   if (method->is_overpass()) {

   565     return;

   566   }

   568   write_u2(access_flags.get_flags() & JVM_RECOGNIZED_METHOD_MODIFIERS);

   569   write_u2(const_method->name_index());

   570   write_u2(const_method->signature_index());

   572   // write attributes in the same order javac does, so we can test with byte for

   573   // byte comparison

   574   int attr_count = 0;

   575   if (const_method->code_size() != 0) {

   576     ++attr_count;     // has Code attribute

   577   }

   578   if (const_method->has_checked_exceptions()) {

   579     ++attr_count;     // has Exceptions attribute

   580   }

   581   if (default_anno != NULL) {

   582     ++attr_count;     // has AnnotationDefault attribute

   583   }

   584   // Deprecated attribute would go here

   585   if (access_flags.is_synthetic()) { // FIXME

   586     // ++attr_count;

   587   }

   588   if (generic_signature_index != 0) {

   589     ++attr_count;

   590   }

   591   if (anno != NULL) {

   592     ++attr_count;     // has RuntimeVisibleAnnotations attribute

   593   }

   594   if (param_anno != NULL) {

   595     ++attr_count;     // has RuntimeVisibleParameterAnnotations attribute

   596   }

   598   write_u2(attr_count);

   599   if (const_method->code_size() > 0) {

   600     write_code_attribute(method);

   601   }

   602   if (const_method->has_checked_exceptions()) {

   603     write_exceptions_attribute(const_method);

   604   }

   605   if (default_anno != NULL) {

   606     write_annotations_attribute("AnnotationDefault", default_anno);

   607   }

   608   // Deprecated attribute would go here

   609   if (access_flags.is_synthetic()) {

   610     // write_synthetic_attribute();

   611   }

   612   if (generic_signature_index != 0) {

   613     write_signature_attribute(generic_signature_index);

   614   }

   615   if (anno != NULL) {

   616     write_annotations_attribute("RuntimeVisibleAnnotations", anno);

   617   }

   618   if (param_anno != NULL) {

   619     write_annotations_attribute("RuntimeVisibleParameterAnnotations", param_anno);

   620   }

   621 }

   623 // Write the class attributes portion of ClassFile structure

   624 // JVMSpec|     u2 attributes_count;

   625 // JVMSpec|     attribute_info attributes[attributes_count];

   626 void JvmtiClassFileReconstituter::write_class_attributes() {

   627   u2 inner_classes_length = inner_classes_attribute_length();

   628   Symbol* generic_signature = ikh()->generic_signature();

   629   AnnotationArray* anno = ikh()->class_annotations();

   631   int attr_count = 0;

   632   if (generic_signature != NULL) {

   633     ++attr_count;

   634   }

   635   if (ikh()->source_file_name() != NULL) {

   636     ++attr_count;

   637   }

   638   if (ikh()->source_debug_extension() != NULL) {

   639     ++attr_count;

   640   }

   641   if (inner_classes_length > 0) {

   642     ++attr_count;

   643   }

   644   if (anno != NULL) {

   645     ++attr_count;     // has RuntimeVisibleAnnotations attribute

   646   }

   647   if (cpool()->operands() != NULL) {

   648     ++attr_count;

   649   }

   651   write_u2(attr_count);

   653   if (generic_signature != NULL) {

   654     write_signature_attribute(symbol_to_cpool_index(generic_signature));

   655   }

   656   if (ikh()->source_file_name() != NULL) {

   657     write_source_file_attribute();

   658   }

   659   if (ikh()->source_debug_extension() != NULL) {

   660     write_source_debug_extension_attribute();

   661   }

   662   if (inner_classes_length > 0) {

   663     write_inner_classes_attribute(inner_classes_length);

   664   }

   665   if (anno != NULL) {

   666     write_annotations_attribute("RuntimeVisibleAnnotations", anno);

   667   }

   668   if (cpool()->operands() != NULL) {

   669     write_bootstrapmethod_attribute();

   670   }

   671 }

   673 // Write the method information portion of ClassFile structure

   674 // JVMSpec|     u2 methods_count;

   675 // JVMSpec|     method_info methods[methods_count];

   676 void JvmtiClassFileReconstituter::write_method_infos() {

   677   HandleMark hm(thread());

   678   Array<Method*>* methods = ikh()->methods();

   679   int num_methods = methods->length();

   680   int num_overpass = 0;

   682   // count the generated default interface methods

   683   // these will not be re-created by write_method_info

   684   // and should not be included in the total count

   685   for (int index = 0; index < num_methods; index++) {

   686     Method* method = methods->at(index);

   687     if (method->is_overpass()) {

   688       num_overpass++;

   689     }

   690   }

   692   write_u2(num_methods - num_overpass);

   693   if (JvmtiExport::can_maintain_original_method_order()) {

   694     int index;

   695     int original_index;

   696     intArray method_order(num_methods, 0);

   698     // invert the method order mapping

   699     for (index = 0; index < num_methods; index++) {

   700       original_index = ikh()->method_ordering()->at(index);

   701       assert(original_index >= 0 && original_index < num_methods,

   702              "invalid original method index");

   703       method_order.at_put(original_index, index);

   704     }

   706     // write in original order

   707     for (original_index = 0; original_index < num_methods; original_index++) {

   708       index = method_order.at(original_index);

   709       methodHandle method(thread(), methods->at(index));

   710       write_method_info(method);

   711     }

   712   } else {

   713     // method order not preserved just dump the method infos

   714     for (int index = 0; index < num_methods; index++) {

   715       methodHandle method(thread(), methods->at(index));

   716       write_method_info(method);

   717     }

   718   }

   719 }

   721 void JvmtiClassFileReconstituter::write_class_file_format() {

   722   ReallocMark();

   724   // JVMSpec|   ClassFile {

   725   // JVMSpec|           u4 magic;

   726   write_u4(0xCAFEBABE);

   728   // JVMSpec|           u2 minor_version;

   729   // JVMSpec|           u2 major_version;

   730   write_u2(ikh()->minor_version());

   731   u2 major = ikh()->major_version();

   732   write_u2(major);

   734   // JVMSpec|           u2 constant_pool_count;

   735   // JVMSpec|           cp_info constant_pool[constant_pool_count-1];

   736   write_u2(cpool()->length());

   737   copy_cpool_bytes(writeable_address(cpool_size()));

   739   // JVMSpec|           u2 access_flags;

   740   write_u2(ikh()->access_flags().get_flags() & JVM_RECOGNIZED_CLASS_MODIFIERS);

   742   // JVMSpec|           u2 this_class;

   743   // JVMSpec|           u2 super_class;

   744   write_u2(class_symbol_to_cpool_index(ikh()->name()));

   745   Klass* super_class = ikh()->super();

   746   write_u2(super_class == NULL? 0 :  // zero for java.lang.Object

   747                 class_symbol_to_cpool_index(super_class->name()));

   749   // JVMSpec|           u2 interfaces_count;

   750   // JVMSpec|           u2 interfaces[interfaces_count];

   751   Array<Klass*>* interfaces =  ikh()->local_interfaces();

   752   int num_interfaces = interfaces->length();

   753   write_u2(num_interfaces);

   754   for (int index = 0; index < num_interfaces; index++) {

   755     HandleMark hm(thread());

   756     instanceKlassHandle iikh(thread(), interfaces->at(index));

   757     write_u2(class_symbol_to_cpool_index(iikh->name()));

   758   }

   760   // JVMSpec|           u2 fields_count;

   761   // JVMSpec|           field_info fields[fields_count];

   762   write_field_infos();

   764   // JVMSpec|           u2 methods_count;

   765   // JVMSpec|           method_info methods[methods_count];

   766   write_method_infos();

   768   // JVMSpec|           u2 attributes_count;

   769   // JVMSpec|           attribute_info attributes[attributes_count];

   770   // JVMSpec|   } /* end ClassFile 8?

   771   write_class_attributes();

   772 }

   774 address JvmtiClassFileReconstituter::writeable_address(size_t size) {

   775   size_t used_size = _buffer_ptr - _buffer;

   776   if (size + used_size >= _buffer_size) {

   777     // compute the new buffer size: must be at least twice as big as before

   778     // plus whatever new is being used; then convert to nice clean block boundary

   779     size_t new_buffer_size = (size + _buffer_size*2 + 1) / initial_buffer_size

   780                                                          * initial_buffer_size;

   782     // VM goes belly-up if the memory isn't available, so cannot do OOM processing

   783     _buffer = REALLOC_RESOURCE_ARRAY(u1, _buffer, _buffer_size, new_buffer_size);

   784     _buffer_size = new_buffer_size;

   785     _buffer_ptr = _buffer + used_size;

   786   }

   787   u1* ret_ptr = _buffer_ptr;

   788   _buffer_ptr += size;

   789   return ret_ptr;

   790 }

   792 void JvmtiClassFileReconstituter::write_attribute_name_index(const char* name) {

   793   TempNewSymbol sym = SymbolTable::probe(name, (int)strlen(name));

   794   assert(sym != NULL, "attribute name symbol not found");

   795   u2 attr_name_index = symbol_to_cpool_index(sym);

   796   assert(attr_name_index != 0, "attribute name symbol not in constant pool");

   797   write_u2(attr_name_index);

   798 }

   800 void JvmtiClassFileReconstituter::write_u1(u1 x) {

   801   *writeable_address(1) = x;

   802 }

   804 void JvmtiClassFileReconstituter::write_u2(u2 x) {

   805   Bytes::put_Java_u2(writeable_address(2), x);

   806 }

   808 void JvmtiClassFileReconstituter::write_u4(u4 x) {

   809   Bytes::put_Java_u4(writeable_address(4), x);

   810 }

   812 void JvmtiClassFileReconstituter::write_u8(u8 x) {

   813   Bytes::put_Java_u8(writeable_address(8), x);

   814 }

   816 void JvmtiClassFileReconstituter::copy_bytecodes(methodHandle mh,

   817                                                  unsigned char* bytecodes) {

   818   // use a BytecodeStream to iterate over the bytecodes. JVM/fast bytecodes

   819   // and the breakpoint bytecode are converted to their original bytecodes.

   821   BytecodeStream bs(mh);

   823   unsigned char* p = bytecodes;

   824   Bytecodes::Code code;

   825   bool is_rewritten = mh->method_holder()->is_rewritten();

   827   while ((code = bs.next()) >= 0) {

   828     assert(Bytecodes::is_java_code(code), "sanity check");

   829     assert(code != Bytecodes::_breakpoint, "sanity check");

   831     // length of bytecode (mnemonic + operands)

   832     address bcp = bs.bcp();

   833     int     len = bs.instruction_size();

   834     assert(len > 0, "length must be > 0");

   836     // copy the bytecodes

   837     *p = (unsigned char) (bs.is_wide()? Bytecodes::_wide : code);

   838     if (len > 1) {

   839       memcpy(p+1, bcp+1, len-1);

   840     }

   842     // During linking the get/put and invoke instructions are rewritten

   843     // with an index into the constant pool cache. The original constant

   844     // pool index must be returned to caller.  Rewrite the index.

   845     if (is_rewritten && len > 1) {

   846       bool is_wide = false;

   847       switch (code) {

   848       case Bytecodes::_getstatic       :  // fall through

   849       case Bytecodes::_putstatic       :  // fall through

   850       case Bytecodes::_getfield        :  // fall through

   851       case Bytecodes::_putfield        :  // fall through

   852       case Bytecodes::_invokevirtual   :  // fall through

   853       case Bytecodes::_invokespecial   :  // fall through

   854       case Bytecodes::_invokestatic    :  // fall through

   855       case Bytecodes::_invokedynamic   :  // fall through

   856       case Bytecodes::_invokeinterface : {

   857         assert(len == 3 ||

   858                (code == Bytecodes::_invokeinterface && len == 5) ||

   859                (code == Bytecodes::_invokedynamic   && len == 5),

   860                "sanity check");

   862         int cpci = Bytes::get_native_u2(bcp+1);

   863         bool is_invokedynamic = (EnableInvokeDynamic && code == Bytecodes::_invokedynamic);

   864         ConstantPoolCacheEntry* entry;

   865         if (is_invokedynamic) {

   866           cpci = Bytes::get_native_u4(bcp+1);

   867           entry = mh->constants()->invokedynamic_cp_cache_entry_at(cpci);

   868         } else {

   869         // cache cannot be pre-fetched since some classes won't have it yet

   870           entry = mh->constants()->cache()->entry_at(cpci);

   871         }

   872         int i = entry->constant_pool_index();

   873         assert(i < mh->constants()->length(), "sanity check");

   874         Bytes::put_Java_u2((address)(p+1), (u2)i);     // java byte ordering

   875         if (is_invokedynamic)  *(p+3) = *(p+4) = 0;

   876         break;

   877       }

   878       case Bytecodes::_ldc_w:

   879         is_wide = true; // fall through

   880       case Bytecodes::_ldc: {

   881         if (bs.raw_code() == Bytecodes::_fast_aldc || bs.raw_code() == Bytecodes::_fast_aldc_w) {

   882           int cpci = is_wide ? Bytes::get_native_u2(bcp+1) : (u1)(*(bcp+1));

   883           int i = mh->constants()->object_to_cp_index(cpci);

   884           assert(i < mh->constants()->length(), "sanity check");

   885           if (is_wide) {

   886             Bytes::put_Java_u2((address)(p+1), (u2)i);     // java byte ordering

   887           } else {

   888             *(p+1) = (u1)i;

   889           }

   890         }

   891         break;

   892         }

   893       }

   894     }

   896     p += len;

   897   }

   898 }

Mercurial > jdk8-mips64-public > hotspot / file revision

src/share/vm/prims/jvmtiClassFileReconstituter.cpp@710a3c8b516e

src/share/vm/prims/jvmtiClassFileReconstituter.cpp