jdk8-mips64-public/hotspot: src/share/vm/prims/jvmtiClassFileReconstituter.cpp@9ce110b1d14a

     1 /*

     2  * Copyright (c) 2005, 2012, 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 #include "precompiled.hpp"

    26 #include "classfile/symbolTable.hpp"

    27 #include "interpreter/bytecodeStream.hpp"

    28 #include "oops/fieldStreams.hpp"

    29 #include "prims/jvmtiClassFileReconstituter.hpp"

    30 #include "runtime/signature.hpp"

    31 #ifdef TARGET_ARCH_x86

    32 # include "bytes_x86.hpp"

    33 #endif

    34 #ifdef TARGET_ARCH_sparc

    35 # include "bytes_sparc.hpp"

    36 #endif

    37 #ifdef TARGET_ARCH_zero

    38 # include "bytes_zero.hpp"

    39 #endif

    40 #ifdef TARGET_ARCH_arm

    41 # include "bytes_arm.hpp"

    42 #endif

    43 #ifdef TARGET_ARCH_ppc

    44 # include "bytes_ppc.hpp"

    45 #endif

    46 // FIXME: add Deprecated attribute

    47 // FIXME: fix Synthetic attribute

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

    51 // Write the field information portion of ClassFile structure

    52 // JVMSpec|     u2 fields_count;

    53 // JVMSpec|     field_info fields[fields_count];

    54 void JvmtiClassFileReconstituter::write_field_infos() {

    55   HandleMark hm(thread());

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

    58   // Compute the real number of Java fields

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

    61   write_u2(java_fields);

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

    63     AccessFlags access_flags = fs.access_flags();

    64     int name_index = fs.name_index();

    65     int signature_index = fs.signature_index();

    66     int initial_value_index = fs.initval_index();

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

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

    69     int generic_signature_index = fs.generic_signature_index();

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

    72     // JVMSpec|   field_info {

    73     // JVMSpec|         u2 access_flags;

    74     // JVMSpec|         u2 name_index;

    75     // JVMSpec|         u2 descriptor_index;

    76     // JVMSpec|         u2 attributes_count;

    77     // JVMSpec|         attribute_info attributes[attributes_count];

    78     // JVMSpec|   }

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

    81     write_u2(name_index);

    82     write_u2(signature_index);

    83     int attr_count = 0;

    84     if (initial_value_index != 0) {

    85       ++attr_count;

    86     }

    87     if (access_flags.is_synthetic()) {

    88       // ++attr_count;

    89     }

    90     if (generic_signature_index != 0) {

    91       ++attr_count;

    92     }

    93     if (anno != NULL) {

    94       ++attr_count;     // has RuntimeVisibleAnnotations attribute

    95     }

    97     write_u2(attr_count);

    99     if (initial_value_index != 0) {

   100       write_attribute_name_index("ConstantValue");

   101       write_u4(2); //length always 2

   102       write_u2(initial_value_index);

   103     }

   104     if (access_flags.is_synthetic()) {

   105       // write_synthetic_attribute();

   106     }

   107     if (generic_signature_index != 0) {

   108       write_signature_attribute(generic_signature_index);

   109     }

   110     if (anno != NULL) {

   111       write_annotations_attribute("RuntimeVisibleAnnotations", anno);

   112     }

   113   }

   114 }

   116 // Write Code attribute

   117 // JVMSpec|   Code_attribute {

   118 // JVMSpec|     u2 attribute_name_index;

   119 // JVMSpec|     u4 attribute_length;

   120 // JVMSpec|     u2 max_stack;

   121 // JVMSpec|     u2 max_locals;

   122 // JVMSpec|     u4 code_length;

   123 // JVMSpec|     u1 code[code_length];

   124 // JVMSpec|     u2 exception_table_length;

   125 // JVMSpec|     {       u2 start_pc;

   126 // JVMSpec|             u2 end_pc;

   127 // JVMSpec|             u2  handler_pc;

   128 // JVMSpec|             u2  catch_type;

   129 // JVMSpec|     }       exception_table[exception_table_length];

   130 // JVMSpec|     u2 attributes_count;

   131 // JVMSpec|     attribute_info attributes[attributes_count];

   132 // JVMSpec|   }

   133 void JvmtiClassFileReconstituter::write_code_attribute(methodHandle method) {

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

   135   u2 line_num_cnt = 0;

   136   int stackmap_len = 0;

   137   int local_variable_table_length = 0;

   138   int local_variable_type_table_length = 0;

   140   // compute number and length of attributes

   141   int attr_count = 0;

   142   int attr_size = 0;

   143   if (const_method->has_linenumber_table()) {

   144     line_num_cnt = line_number_table_entries(method);

   145     if (line_num_cnt != 0) {

   146       ++attr_count;

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

   148       //      LineNumberTable_attribute {

   149       //        u2 attribute_name_index;

   150       //        u4 attribute_length;

   151       //        u2 line_number_table_length;

   152       //        {  u2 start_pc;

   153       //           u2 line_number;

   154       //        } line_number_table[line_number_table_length];

   155       //      }

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

   157     }

   158   }

   159   if (method->has_stackmap_table()) {

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

   161     if (stackmap_len != 0) {

   162       ++attr_count;

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

   164       //      StackMapTable_attribute {

   165       //        u2 attribute_name_index;

   166       //        u4 attribute_length;

   167       //        u2 number_of_entries;

   168       //        stack_map_frame_entries[number_of_entries];

   169       //      }

   170       attr_size += 2 + 4 + stackmap_len;

   171     }

   172   }

   173   if (method->has_localvariable_table()) {

   174     local_variable_table_length = method->localvariable_table_length();

   175     if (local_variable_table_length != 0) {

   176       ++attr_count;

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

   178       // LocalVariableTable_attribute {

   179       //   u2 attribute_name_index;

   180       //   u4 attribute_length;

   181       //   u2 local_variable_table_length;

   182       //   {

   183       //     u2 start_pc;

   184       //     u2 length;

   185       //     u2 name_index;

   186       //     u2 descriptor_index;

   187       //     u2 index;

   188       //   }

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

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

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

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

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

   195           local_variable_type_table_length++;

   196         }

   197       }

   199       if (local_variable_type_table_length != 0) {

   200         ++attr_count;

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

   202         // LocalVariableTypeTable_attribute {

   203         //   u2 attribute_name_index;

   204         //   u4 attribute_length;

   205         //   u2 local_variable_type_table_length;

   206         //   {

   207         //     u2 start_pc;

   208         //     u2 length;

   209         //     u2 name_index;

   210         //     u2 signature_index;

   211         //     u2 index;

   212         //   }

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

   214       }

   215     }

   216   }

   218   ExceptionTable exception_table(method());

   219   int exception_table_length = exception_table.length();

   220   int code_size = const_method->code_size();

   221   int size =

   222     2+2+4 +                                // max_stack, max_locals, code_length

   223     code_size +                            // code

   224     2 +                                    // exception_table_length

   225     (2+2+2+2) * exception_table_length +   // exception_table

   226     2 +                                    // attributes_count

   227     attr_size;                             // attributes

   229   write_attribute_name_index("Code");

   230   write_u4(size);

   231   write_u2(method->verifier_max_stack());

   232   write_u2(method->max_locals());

   233   write_u4(code_size);

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

   235   write_u2(exception_table_length);

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

   237     write_u2(exception_table.start_pc(index));

   238     write_u2(exception_table.end_pc(index));

   239     write_u2(exception_table.handler_pc(index));

   240     write_u2(exception_table.catch_type_index(index));

   241   }

   242   write_u2(attr_count);

   243   if (line_num_cnt != 0) {

   244     write_line_number_table_attribute(method, line_num_cnt);

   245   }

   246   if (stackmap_len != 0) {

   247     write_stackmap_table_attribute(method, stackmap_len);

   248   }

   249   if (local_variable_table_length != 0) {

   250     write_local_variable_table_attribute(method, local_variable_table_length);

   251   }

   252   if (local_variable_type_table_length != 0) {

   253     write_local_variable_type_table_attribute(method, local_variable_type_table_length);

   254   }

   255 }

   257 // Write Exceptions attribute

   258 // JVMSpec|   Exceptions_attribute {

   259 // JVMSpec|     u2 attribute_name_index;

   260 // JVMSpec|     u4 attribute_length;

   261 // JVMSpec|     u2 number_of_exceptions;

   262 // JVMSpec|     u2 exception_index_table[number_of_exceptions];

   263 // JVMSpec|   }

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

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

   266   int checked_exceptions_length = const_method->checked_exceptions_length();

   267   int size =

   268     2 +                                    // number_of_exceptions

   269     2 * checked_exceptions_length;         // exception_index_table

   271   write_attribute_name_index("Exceptions");

   272   write_u4(size);

   273   write_u2(checked_exceptions_length);

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

   275     write_u2(checked_exceptions[index].class_cp_index);

   276   }

   277 }

   279 // Write SourceFile attribute

   280 // JVMSpec|   SourceFile_attribute {

   281 // JVMSpec|     u2 attribute_name_index;

   282 // JVMSpec|     u4 attribute_length;

   283 // JVMSpec|     u2 sourcefile_index;

   284 // JVMSpec|   }

   285 void JvmtiClassFileReconstituter::write_source_file_attribute() {

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

   288   write_attribute_name_index("SourceFile");

   289   write_u4(2);  // always length 2

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

   291 }

   293 // Write SourceDebugExtension attribute

   294 // JSR45|   SourceDebugExtension_attribute {

   295 // JSR45|       u2 attribute_name_index;

   296 // JSR45|       u4 attribute_length;

   297 // JSR45|       u1 debug_extension[attribute_length];

   298 // JSR45|   }

   299 void JvmtiClassFileReconstituter::write_source_debug_extension_attribute() {

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

   302   write_attribute_name_index("SourceDebugExtension");

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

   304   write_u4(len);

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

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

   307     write_u1(ext[i]);

   308   }

   309 }

   311 // Write (generic) Signature attribute

   312 // JVMSpec|   Signature_attribute {

   313 // JVMSpec|     u2 attribute_name_index;

   314 // JVMSpec|     u4 attribute_length;

   315 // JVMSpec|     u2 signature_index;

   316 // JVMSpec|   }

   317 void JvmtiClassFileReconstituter::write_signature_attribute(u2 generic_signature_index) {

   318   write_attribute_name_index("Signature");

   319   write_u4(2);  // always length 2

   320   write_u2(generic_signature_index);

   321 }

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

   324 u2 JvmtiClassFileReconstituter::inner_classes_attribute_length() {

   325   InnerClassesIterator iter(ikh());

   326   return iter.length();

   327 }

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

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

   331 // JSR202|   *Annotations_attribute {

   332 // JSR202|     u2 attribute_name_index;

   333 // JSR202|     u4 attribute_length;

   334 // JSR202|     ...

   335 // JSR202|   }

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

   337                                                               AnnotationArray* annos) {

   338   u4 length = annos->length();

   339   write_attribute_name_index(attr_name);

   340   write_u4(length);

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

   342 }

   345 // Write InnerClasses attribute

   346 // JVMSpec|   InnerClasses_attribute {

   347 // JVMSpec|     u2 attribute_name_index;

   348 // JVMSpec|     u4 attribute_length;

   349 // JVMSpec|     u2 number_of_classes;

   350 // JVMSpec|     {  u2 inner_class_info_index;

   351 // JVMSpec|        u2 outer_class_info_index;

   352 // JVMSpec|        u2 inner_name_index;

   353 // JVMSpec|        u2 inner_class_access_flags;

   354 // JVMSpec|     } classes[number_of_classes];

   355 // JVMSpec|   }

   356 void JvmtiClassFileReconstituter::write_inner_classes_attribute(int length) {

   357   InnerClassesIterator iter(ikh());

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

   359             "caller must check");

   360   u2 entry_count = length / InstanceKlass::inner_class_next_offset;

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

   363   write_attribute_name_index("InnerClasses");

   364   write_u4(size);

   365   write_u2(entry_count);

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

   367     write_u2(iter.inner_class_info_index());

   368     write_u2(iter.outer_class_info_index());

   369     write_u2(iter.inner_name_index());

   370     write_u2(iter.inner_access_flags());

   371   }

   372 }

   374 // Write Synthetic attribute

   375 // JVMSpec|   Synthetic_attribute {

   376 // JVMSpec|     u2 attribute_name_index;

   377 // JVMSpec|     u4 attribute_length;

   378 // JVMSpec|   }

   379 void JvmtiClassFileReconstituter::write_synthetic_attribute() {

   380   write_attribute_name_index("Synthetic");

   381   write_u4(0); //length always zero

   382 }

   384 // Compute size of LineNumberTable

   385 u2 JvmtiClassFileReconstituter::line_number_table_entries(methodHandle method) {

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

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

   388   u2 num_entries = 0;

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

   390   while (stream.read_pair()) {

   391     num_entries++;

   392   }

   393   return num_entries;

   394 }

   396 // Write LineNumberTable attribute

   397 // JVMSpec|   LineNumberTable_attribute {

   398 // JVMSpec|     u2 attribute_name_index;

   399 // JVMSpec|     u4 attribute_length;

   400 // JVMSpec|     u2 line_number_table_length;

   401 // JVMSpec|     {  u2 start_pc;

   402 // JVMSpec|        u2 line_number;

   403 // JVMSpec|     } line_number_table[line_number_table_length];

   404 // JVMSpec|   }

   405 void JvmtiClassFileReconstituter::write_line_number_table_attribute(methodHandle method,

   406                                                                     u2 num_entries) {

   408   write_attribute_name_index("LineNumberTable");

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

   410   write_u2(num_entries);

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

   413   while (stream.read_pair()) {

   414     write_u2(stream.bci());

   415     write_u2(stream.line());

   416   }

   417 }

   419 // Write LocalVariableTable attribute

   420 // JVMSpec|   LocalVariableTable_attribute {

   421 // JVMSpec|     u2 attribute_name_index;

   422 // JVMSpec|     u4 attribute_length;

   423 // JVMSpec|     u2 local_variable_table_length;

   424 // JVMSpec|     {  u2 start_pc;

   425 // JVMSpec|       u2 length;

   426 // JVMSpec|       u2 name_index;

   427 // JVMSpec|       u2 descriptor_index;

   428 // JVMSpec|       u2 index;

   429 // JVMSpec|     } local_variable_table[local_variable_table_length];

   430 // JVMSpec|   }

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

   432     write_attribute_name_index("LocalVariableTable");

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

   434     write_u2(num_entries);

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

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

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

   440       write_u2(elem->start_bci);

   441       write_u2(elem->length);

   442       write_u2(elem->name_cp_index);

   443       write_u2(elem->descriptor_cp_index);

   444       write_u2(elem->slot);

   445       elem++;

   446     }

   447 }

   449 // Write LocalVariableTypeTable attribute

   450 // JVMSpec|   LocalVariableTypeTable_attribute {

   451 // JVMSpec|     u2 attribute_name_index;

   452 // JVMSpec|     u4 attribute_length;

   453 // JVMSpec|     u2 local_variable_type_table_length;

   454 // JVMSpec|     { u2 start_pc;

   455 // JVMSpec|       u2 length;

   456 // JVMSpec|       u2 name_index;

   457 // JVMSpec|       u2 signature_index;

   458 // JVMSpec|       u2 index;

   459 // JVMSpec|     } local_variable_type_table[local_variable_type_table_length];

   460 // JVMSpec|   }

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

   462     write_attribute_name_index("LocalVariableTypeTable");

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

   464     write_u2(num_entries);

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

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

   468       if (elem->signature_cp_index > 0) {

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

   470         write_u2(elem->start_bci);

   471         write_u2(elem->length);

   472         write_u2(elem->name_cp_index);

   473         write_u2(elem->signature_cp_index);

   474         write_u2(elem->slot);

   475         num_entries--;

   476       }

   477       elem++;

   478     }

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

   480 }

   482 // Write stack map table attribute

   483 // JSR-202|   StackMapTable_attribute {

   484 // JSR-202|     u2 attribute_name_index;

   485 // JSR-202|     u4 attribute_length;

   486 // JSR-202|     u2 number_of_entries;

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

   488 // JSR-202|   }

   489 void JvmtiClassFileReconstituter::write_stackmap_table_attribute(methodHandle method,

   490                                                                  int stackmap_len) {

   492   write_attribute_name_index("StackMapTable");

   493   write_u4(stackmap_len);

   494   memcpy(

   495     writeable_address(stackmap_len),

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

   497     stackmap_len);

   498 }

   500 // Write one method_info structure

   501 // JVMSpec|   method_info {

   502 // JVMSpec|     u2 access_flags;

   503 // JVMSpec|     u2 name_index;

   504 // JVMSpec|     u2 descriptor_index;

   505 // JVMSpec|     u2 attributes_count;

   506 // JVMSpec|     attribute_info attributes[attributes_count];

   507 // JVMSpec|   }

   508 void JvmtiClassFileReconstituter::write_method_info(methodHandle method) {

   509   AccessFlags access_flags = method->access_flags();

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

   511   u2 generic_signature_index = const_method->generic_signature_index();

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

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

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

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

   517   write_u2(const_method->name_index());

   518   write_u2(const_method->signature_index());

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

   521   // byte comparison

   522   int attr_count = 0;

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

   524     ++attr_count;     // has Code attribute

   525   }

   526   if (const_method->has_checked_exceptions()) {

   527     ++attr_count;     // has Exceptions attribute

   528   }

   529   if (default_anno != NULL) {

   530     ++attr_count;     // has AnnotationDefault attribute

   531   }

   532   // Deprecated attribute would go here

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

   534     // ++attr_count;

   535   }

   536   if (generic_signature_index != 0) {

   537     ++attr_count;

   538   }

   539   if (anno != NULL) {

   540     ++attr_count;     // has RuntimeVisibleAnnotations attribute

   541   }

   542   if (param_anno != NULL) {

   543     ++attr_count;     // has RuntimeVisibleParameterAnnotations attribute

   544   }

   546   write_u2(attr_count);

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

   548     write_code_attribute(method);

   549   }

   550   if (const_method->has_checked_exceptions()) {

   551     write_exceptions_attribute(const_method);

   552   }

   553   if (default_anno != NULL) {

   554     write_annotations_attribute("AnnotationDefault", default_anno);

   555   }

   556   // Deprecated attribute would go here

   557   if (access_flags.is_synthetic()) {

   558     // write_synthetic_attribute();

   559   }

   560   if (generic_signature_index != 0) {

   561     write_signature_attribute(generic_signature_index);

   562   }

   563   if (anno != NULL) {

   564     write_annotations_attribute("RuntimeVisibleAnnotations", anno);

   565   }

   566   if (param_anno != NULL) {

   567     write_annotations_attribute("RuntimeVisibleParameterAnnotations", param_anno);

   568   }

   569 }

   571 // Write the class attributes portion of ClassFile structure

   572 // JVMSpec|     u2 attributes_count;

   573 // JVMSpec|     attribute_info attributes[attributes_count];

   574 void JvmtiClassFileReconstituter::write_class_attributes() {

   575   u2 inner_classes_length = inner_classes_attribute_length();

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

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

   579   int attr_count = 0;

   580   if (generic_signature != NULL) {

   581     ++attr_count;

   582   }

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

   584     ++attr_count;

   585   }

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

   587     ++attr_count;

   588   }

   589   if (inner_classes_length > 0) {

   590     ++attr_count;

   591   }

   592   if (anno != NULL) {

   593     ++attr_count;     // has RuntimeVisibleAnnotations attribute

   594   }

   596   write_u2(attr_count);

   598   if (generic_signature != NULL) {

   599     write_signature_attribute(symbol_to_cpool_index(generic_signature));

   600   }

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

   602     write_source_file_attribute();

   603   }

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

   605     write_source_debug_extension_attribute();

   606   }

   607   if (inner_classes_length > 0) {

   608     write_inner_classes_attribute(inner_classes_length);

   609   }

   610   if (anno != NULL) {

   611     write_annotations_attribute("RuntimeVisibleAnnotations", anno);

   612   }

   613 }

   615 // Write the method information portion of ClassFile structure

   616 // JVMSpec|     u2 methods_count;

   617 // JVMSpec|     method_info methods[methods_count];

   618 void JvmtiClassFileReconstituter::write_method_infos() {

   619   HandleMark hm(thread());

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

   621   int num_methods = methods->length();

   623   write_u2(num_methods);

   624   if (JvmtiExport::can_maintain_original_method_order()) {

   625     int index;

   626     int original_index;

   627     intArray method_order(num_methods, 0);

   629     // invert the method order mapping

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

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

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

   633              "invalid original method index");

   634       method_order.at_put(original_index, index);

   635     }

   637     // write in original order

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

   639       index = method_order.at(original_index);

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

   641       write_method_info(method);

   642     }

   643   } else {

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

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

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

   647       write_method_info(method);

   648     }

   649   }

   650 }

   652 void JvmtiClassFileReconstituter::write_class_file_format() {

   653   ReallocMark();

   655   // JVMSpec|   ClassFile {

   656   // JVMSpec|           u4 magic;

   657   write_u4(0xCAFEBABE);

   659   // JVMSpec|           u2 minor_version;

   660   // JVMSpec|           u2 major_version;

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

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

   663   write_u2(major);

   665   // JVMSpec|           u2 constant_pool_count;

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

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

   668   copy_cpool_bytes(writeable_address(cpool_size()));

   670   // JVMSpec|           u2 access_flags;

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

   673   // JVMSpec|           u2 this_class;

   674   // JVMSpec|           u2 super_class;

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

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

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

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

   680   // JVMSpec|           u2 interfaces_count;

   681   // JVMSpec|           u2 interfaces[interfaces_count];

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

   683   int num_interfaces = interfaces->length();

   684   write_u2(num_interfaces);

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

   686     HandleMark hm(thread());

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

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

   689   }

   691   // JVMSpec|           u2 fields_count;

   692   // JVMSpec|           field_info fields[fields_count];

   693   write_field_infos();

   695   // JVMSpec|           u2 methods_count;

   696   // JVMSpec|           method_info methods[methods_count];

   697   write_method_infos();

   699   // JVMSpec|           u2 attributes_count;

   700   // JVMSpec|           attribute_info attributes[attributes_count];

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

   702   write_class_attributes();

   703 }

   705 address JvmtiClassFileReconstituter::writeable_address(size_t size) {

   706   size_t used_size = _buffer_ptr - _buffer;

   707   if (size + used_size >= _buffer_size) {

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

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

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

   711                                                          * initial_buffer_size;

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

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

   715     _buffer_size = new_buffer_size;

   716     _buffer_ptr = _buffer + used_size;

   717   }

   718   u1* ret_ptr = _buffer_ptr;

   719   _buffer_ptr += size;

   720   return ret_ptr;

   721 }

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

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

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

   726   u2 attr_name_index = symbol_to_cpool_index(sym);

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

   728   write_u2(attr_name_index);

   729 }

   731 void JvmtiClassFileReconstituter::write_u1(u1 x) {

   732   *writeable_address(1) = x;

   733 }

   735 void JvmtiClassFileReconstituter::write_u2(u2 x) {

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

   737 }

   739 void JvmtiClassFileReconstituter::write_u4(u4 x) {

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

   741 }

   743 void JvmtiClassFileReconstituter::write_u8(u8 x) {

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

   745 }

   747 void JvmtiClassFileReconstituter::copy_bytecodes(methodHandle mh,

   748                                                  unsigned char* bytecodes) {

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

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

   752   BytecodeStream bs(mh);

   754   unsigned char* p = bytecodes;

   755   Bytecodes::Code code;

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

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

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

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

   762     // length of bytecode (mnemonic + operands)

   763     address bcp = bs.bcp();

   764     int     len = bs.instruction_size();

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

   767     // copy the bytecodes

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

   769     if (len > 1) {

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

   771     }

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

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

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

   776     if (is_rewritten && len > 1) {

   777       bool is_wide = false;

   778       switch (code) {

   779       case Bytecodes::_getstatic       :  // fall through

   780       case Bytecodes::_putstatic       :  // fall through

   781       case Bytecodes::_getfield        :  // fall through

   782       case Bytecodes::_putfield        :  // fall through

   783       case Bytecodes::_invokevirtual   :  // fall through

   784       case Bytecodes::_invokespecial   :  // fall through

   785       case Bytecodes::_invokestatic    :  // fall through

   786       case Bytecodes::_invokedynamic   :  // fall through

   787       case Bytecodes::_invokeinterface : {

   788         assert(len == 3 ||

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

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

   791                "sanity check");

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

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

   795         ConstantPoolCacheEntry* entry;

   796         if (is_invokedynamic) {

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

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

   799         } else {

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

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

   802         }

   803         int i = entry->constant_pool_index();

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

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

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

   807         break;

   808       }

   809       case Bytecodes::_ldc_w:

   810         is_wide = true; // fall through

   811       case Bytecodes::_ldc: {

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

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

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

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

   816           if (is_wide) {

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

   818           } else {

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

   820           }

   821         }

   822         break;

   823         }

   824       }

   825     }

   827     p += len;

   828   }

   829 }

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

src/share/vm/prims/jvmtiClassFileReconstituter.cpp@9ce110b1d14a

src/share/vm/prims/jvmtiClassFileReconstituter.cpp