jdk8-mips64-public/hotspot: src/share/vm/prims/jvmtiClassFileReconstituter.cpp@f7c4174b33ba

7109878: The instanceKlass EnclosingMethhod attribute fields can be folded into the _inner_class field.
Summary: Fold instanceKlass::_enclosing_method_class_index and instanceKlass::_enclosing_method_method_index into the instanceKlass::_inner_classes array.
Reviewed-by: never, coleenp
Contributed-by: Jiangli Zhou <jiangli.zhou@oracle.com>

     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, LVTT attributes

    47 // FIXME: fix Synthetic attribute

    48 // FIXME: per Serguei, add error return handling for constantPoolOopDesc::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   objArrayHandle fields_anno(thread(), 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     typeArrayHandle anno(thread(), fields_anno.not_null() ?

    71                                  (typeArrayOop)(fields_anno->obj_at(fs.index())) :

    72                                  (typeArrayOop)NULL);

    74     // JVMSpec|   field_info {

    75     // JVMSpec|         u2 access_flags;

    76     // JVMSpec|         u2 name_index;

    77     // JVMSpec|         u2 descriptor_index;

    78     // JVMSpec|         u2 attributes_count;

    79     // JVMSpec|         attribute_info attributes[attributes_count];

    80     // JVMSpec|   }

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

    83     write_u2(name_index);

    84     write_u2(signature_index);

    85     int attr_count = 0;

    86     if (initial_value_index != 0) {

    87       ++attr_count;

    88     }

    89     if (access_flags.is_synthetic()) {

    90       // ++attr_count;

    91     }

    92     if (generic_signature_index != 0) {

    93       ++attr_count;

    94     }

    95     if (anno.not_null()) {

    96       ++attr_count;     // has RuntimeVisibleAnnotations attribute

    97     }

    99     write_u2(attr_count);

   101     if (initial_value_index != 0) {

   102       write_attribute_name_index("ConstantValue");

   103       write_u4(2); //length always 2

   104       write_u2(initial_value_index);

   105     }

   106     if (access_flags.is_synthetic()) {

   107       // write_synthetic_attribute();

   108     }

   109     if (generic_signature_index != 0) {

   110       write_signature_attribute(generic_signature_index);

   111     }

   112     if (anno.not_null()) {

   113       write_annotations_attribute("RuntimeVisibleAnnotations", anno);

   114     }

   115   }

   116 }

   118 // Write Code attribute

   119 // JVMSpec|   Code_attribute {

   120 // JVMSpec|     u2 attribute_name_index;

   121 // JVMSpec|     u4 attribute_length;

   122 // JVMSpec|     u2 max_stack;

   123 // JVMSpec|     u2 max_locals;

   124 // JVMSpec|     u4 code_length;

   125 // JVMSpec|     u1 code[code_length];

   126 // JVMSpec|     u2 exception_table_length;

   127 // JVMSpec|     {       u2 start_pc;

   128 // JVMSpec|             u2 end_pc;

   129 // JVMSpec|             u2  handler_pc;

   130 // JVMSpec|             u2  catch_type;

   131 // JVMSpec|     }       exception_table[exception_table_length];

   132 // JVMSpec|     u2 attributes_count;

   133 // JVMSpec|     attribute_info attributes[attributes_count];

   134 // JVMSpec|   }

   135 void JvmtiClassFileReconstituter::write_code_attribute(methodHandle method) {

   136   constMethodHandle const_method(thread(), method->constMethod());

   137   u2 line_num_cnt = 0;

   138   int stackmap_len = 0;

   139   int local_variable_table_length = 0;

   141   // compute number and length of attributes

   142   int attr_count = 0;

   143   int attr_size = 0;

   144   if (const_method->has_linenumber_table()) {

   145     line_num_cnt = line_number_table_entries(method);

   146     if (line_num_cnt != 0) {

   147       ++attr_count;

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

   149       //      LineNumberTable_attribute {

   150       //        u2 attribute_name_index;

   151       //        u4 attribute_length;

   152       //        u2 line_number_table_length;

   153       //        {  u2 start_pc;

   154       //           u2 line_number;

   155       //        } line_number_table[line_number_table_length];

   156       //      }

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

   158     }

   159   }

   160   if (method->has_stackmap_table()) {

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

   162     if (stackmap_len != 0) {

   163       ++attr_count;

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

   165       //      StackMapTable_attribute {

   166       //        u2 attribute_name_index;

   167       //        u4 attribute_length;

   168       //        u2 number_of_entries;

   169       //        stack_map_frame_entries[number_of_entries];

   170       //      }

   171       attr_size += 2 + 4 + stackmap_len;

   172     }

   173   }

   174   if (method->has_localvariable_table()) {

   175     local_variable_table_length = method->localvariable_table_length();

   176     ++attr_count;

   177     if (local_variable_table_length != 0) {

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

   179       // LocalVariableTable_attribute {

   180       //   u2 attribute_name_index;

   181       //   u4 attribute_length;

   182       //   u2 local_variable_table_length;

   183       //   {

   184       //     u2 start_pc;

   185       //     u2 length;

   186       //     u2 name_index;

   187       //     u2 descriptor_index;

   188       //     u2 index;

   189       //   }

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

   191     }

   192   }

   194   typeArrayHandle exception_table(thread(), const_method->exception_table());

   195   int exception_table_length = exception_table->length();

   196   int exception_table_entries = exception_table_length / 4;

   197   int code_size = const_method->code_size();

   198   int size =

   199     2+2+4 +                                // max_stack, max_locals, code_length

   200     code_size +                            // code

   201     2 +                                    // exception_table_length

   202     (2+2+2+2) * exception_table_entries +  // exception_table

   203     2 +                                    // attributes_count

   204     attr_size;                             // attributes

   206   write_attribute_name_index("Code");

   207   write_u4(size);

   208   write_u2(method->max_stack());

   209   write_u2(method->max_locals());

   210   write_u4(code_size);

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

   212   write_u2(exception_table_entries);

   213   for (int index = 0; index < exception_table_length; ) {

   214     write_u2(exception_table->int_at(index++));

   215     write_u2(exception_table->int_at(index++));

   216     write_u2(exception_table->int_at(index++));

   217     write_u2(exception_table->int_at(index++));

   218   }

   219   write_u2(attr_count);

   220   if (line_num_cnt != 0) {

   221     write_line_number_table_attribute(method, line_num_cnt);

   222   }

   223   if (stackmap_len != 0) {

   224     write_stackmap_table_attribute(method, stackmap_len);

   225   }

   226   if (local_variable_table_length != 0) {

   227     write_local_variable_table_attribute(method, local_variable_table_length);

   228   }

   229 }

   231 // Write Exceptions attribute

   232 // JVMSpec|   Exceptions_attribute {

   233 // JVMSpec|     u2 attribute_name_index;

   234 // JVMSpec|     u4 attribute_length;

   235 // JVMSpec|     u2 number_of_exceptions;

   236 // JVMSpec|     u2 exception_index_table[number_of_exceptions];

   237 // JVMSpec|   }

   238 void JvmtiClassFileReconstituter::write_exceptions_attribute(constMethodHandle const_method) {

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

   240   int checked_exceptions_length = const_method->checked_exceptions_length();

   241   int size =

   242     2 +                                    // number_of_exceptions

   243     2 * checked_exceptions_length;         // exception_index_table

   245   write_attribute_name_index("Exceptions");

   246   write_u4(size);

   247   write_u2(checked_exceptions_length);

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

   249     write_u2(checked_exceptions[index].class_cp_index);

   250   }

   251 }

   253 // Write SourceFile attribute

   254 // JVMSpec|   SourceFile_attribute {

   255 // JVMSpec|     u2 attribute_name_index;

   256 // JVMSpec|     u4 attribute_length;

   257 // JVMSpec|     u2 sourcefile_index;

   258 // JVMSpec|   }

   259 void JvmtiClassFileReconstituter::write_source_file_attribute() {

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

   262   write_attribute_name_index("SourceFile");

   263   write_u4(2);  // always length 2

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

   265 }

   267 // Write SourceDebugExtension attribute

   268 // JSR45|   SourceDebugExtension_attribute {

   269 // JSR45|       u2 attribute_name_index;

   270 // JSR45|       u4 attribute_length;

   271 // JSR45|       u2 sourcefile_index;

   272 // JSR45|   }

   273 void JvmtiClassFileReconstituter::write_source_debug_extension_attribute() {

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

   276   write_attribute_name_index("SourceDebugExtension");

   277   write_u4(2);  // always length 2

   278   write_u2(symbol_to_cpool_index(ikh()->source_debug_extension()));

   279 }

   281 // Write (generic) Signature attribute

   282 // JVMSpec|   Signature_attribute {

   283 // JVMSpec|     u2 attribute_name_index;

   284 // JVMSpec|     u4 attribute_length;

   285 // JVMSpec|     u2 signature_index;

   286 // JVMSpec|   }

   287 void JvmtiClassFileReconstituter::write_signature_attribute(u2 generic_signature_index) {

   288   write_attribute_name_index("Signature");

   289   write_u4(2);  // always length 2

   290   write_u2(generic_signature_index);

   291 }

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

   294 u2 JvmtiClassFileReconstituter::inner_classes_attribute_length() {

   295   InnerClassesIterator iter(ikh());

   296   return iter.length();

   297 }

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

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

   301 // JSR202|   *Annotations_attribute {

   302 // JSR202|     u2 attribute_name_index;

   303 // JSR202|     u4 attribute_length;

   304 // JSR202|     ...

   305 // JSR202|   }

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

   307                                                               typeArrayHandle annos) {

   308   u4 length = annos->length();

   309   write_attribute_name_index(attr_name);

   310   write_u4(length);

   311   memcpy(writeable_address(length), annos->byte_at_addr(0), length);

   312 }

   315 // Write InnerClasses attribute

   316 // JVMSpec|   InnerClasses_attribute {

   317 // JVMSpec|     u2 attribute_name_index;

   318 // JVMSpec|     u4 attribute_length;

   319 // JVMSpec|     u2 number_of_classes;

   320 // JVMSpec|     {  u2 inner_class_info_index;

   321 // JVMSpec|        u2 outer_class_info_index;

   322 // JVMSpec|        u2 inner_name_index;

   323 // JVMSpec|        u2 inner_class_access_flags;

   324 // JVMSpec|     } classes[number_of_classes];

   325 // JVMSpec|   }

   326 void JvmtiClassFileReconstituter::write_inner_classes_attribute(int length) {

   327   InnerClassesIterator iter(ikh());

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

   329             "caller must check");

   330   u2 entry_count = length / instanceKlass::inner_class_next_offset;

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

   333   write_attribute_name_index("InnerClasses");

   334   write_u4(size);

   335   write_u2(entry_count);

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

   337     write_u2(iter.inner_class_info_index());

   338     write_u2(iter.outer_class_info_index());

   339     write_u2(iter.inner_name_index());

   340     write_u2(iter.inner_access_flags());

   341   }

   342 }

   344 // Write Synthetic attribute

   345 // JVMSpec|   Synthetic_attribute {

   346 // JVMSpec|     u2 attribute_name_index;

   347 // JVMSpec|     u4 attribute_length;

   348 // JVMSpec|   }

   349 void JvmtiClassFileReconstituter::write_synthetic_attribute() {

   350   write_attribute_name_index("Synthetic");

   351   write_u4(0); //length always zero

   352 }

   354 // Compute size of LineNumberTable

   355 u2 JvmtiClassFileReconstituter::line_number_table_entries(methodHandle method) {

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

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

   358   u2 num_entries = 0;

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

   360   while (stream.read_pair()) {

   361     num_entries++;

   362   }

   363   return num_entries;

   364 }

   366 // Write LineNumberTable attribute

   367 // JVMSpec|   LineNumberTable_attribute {

   368 // JVMSpec|     u2 attribute_name_index;

   369 // JVMSpec|     u4 attribute_length;

   370 // JVMSpec|     u2 line_number_table_length;

   371 // JVMSpec|     {  u2 start_pc;

   372 // JVMSpec|        u2 line_number;

   373 // JVMSpec|     } line_number_table[line_number_table_length];

   374 // JVMSpec|   }

   375 void JvmtiClassFileReconstituter::write_line_number_table_attribute(methodHandle method,

   376                                                                     u2 num_entries) {

   378   write_attribute_name_index("LineNumberTable");

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

   380   write_u2(num_entries);

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

   383   while (stream.read_pair()) {

   384     write_u2(stream.bci());

   385     write_u2(stream.line());

   386   }

   387 }

   389 // Write LineNumberTable attribute

   390 // JVMSpec|   LocalVariableTable_attribute {

   391 // JVMSpec|     u2 attribute_name_index;

   392 // JVMSpec|     u4 attribute_length;

   393 // JVMSpec|     u2 local_variable_table_length;

   394 // JVMSpec|     {  u2 start_pc;

   395 // JVMSpec|       u2 length;

   396 // JVMSpec|       u2 name_index;

   397 // JVMSpec|       u2 descriptor_index;

   398 // JVMSpec|       u2 index;

   399 // JVMSpec|     } local_variable_table[local_variable_table_length];

   400 // JVMSpec|   }

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

   402     write_attribute_name_index("LocalVariableTable");

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

   404     write_u2(num_entries);

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

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

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

   410       write_u2(elem->start_bci);

   411       write_u2(elem->length);

   412       write_u2(elem->name_cp_index);

   413       write_u2(elem->descriptor_cp_index);

   414       write_u2(elem->slot);

   415       elem++;

   416     }

   417 }

   419 // Write stack map table attribute

   420 // JSR-202|   StackMapTable_attribute {

   421 // JSR-202|     u2 attribute_name_index;

   422 // JSR-202|     u4 attribute_length;

   423 // JSR-202|     u2 number_of_entries;

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

   425 // JSR-202|   }

   426 void JvmtiClassFileReconstituter::write_stackmap_table_attribute(methodHandle method,

   427                                                                  int stackmap_len) {

   429   write_attribute_name_index("StackMapTable");

   430   write_u4(stackmap_len);

   431   memcpy(

   432     writeable_address(stackmap_len),

   433     (void*)(method->stackmap_data()->byte_at_addr(0)),

   434     stackmap_len);

   435 }

   437 // Write one method_info structure

   438 // JVMSpec|   method_info {

   439 // JVMSpec|     u2 access_flags;

   440 // JVMSpec|     u2 name_index;

   441 // JVMSpec|     u2 descriptor_index;

   442 // JVMSpec|     u2 attributes_count;

   443 // JVMSpec|     attribute_info attributes[attributes_count];

   444 // JVMSpec|   }

   445 void JvmtiClassFileReconstituter::write_method_info(methodHandle method) {

   446   AccessFlags access_flags = method->access_flags();

   447   constMethodHandle const_method(thread(), method->constMethod());

   448   u2 generic_signature_index = const_method->generic_signature_index();

   449   typeArrayHandle anno(thread(), method->annotations());

   450   typeArrayHandle param_anno(thread(), method->parameter_annotations());

   451   typeArrayHandle default_anno(thread(), method->annotation_default());

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

   454   write_u2(const_method->name_index());

   455   write_u2(const_method->signature_index());

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

   458   // byte comparison

   459   int attr_count = 0;

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

   461     ++attr_count;     // has Code attribute

   462   }

   463   if (const_method->has_checked_exceptions()) {

   464     ++attr_count;     // has Exceptions attribute

   465   }

   466   if (default_anno.not_null()) {

   467     ++attr_count;     // has AnnotationDefault attribute

   468   }

   469   // Deprecated attribute would go here

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

   471     // ++attr_count;

   472   }

   473   if (generic_signature_index != 0) {

   474     ++attr_count;

   475   }

   476   if (anno.not_null()) {

   477     ++attr_count;     // has RuntimeVisibleAnnotations attribute

   478   }

   479   if (param_anno.not_null()) {

   480     ++attr_count;     // has RuntimeVisibleParameterAnnotations attribute

   481   }

   483   write_u2(attr_count);

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

   485     write_code_attribute(method);

   486   }

   487   if (const_method->has_checked_exceptions()) {

   488     write_exceptions_attribute(const_method);

   489   }

   490   if (default_anno.not_null()) {

   491     write_annotations_attribute("AnnotationDefault", default_anno);

   492   }

   493   // Deprecated attribute would go here

   494   if (access_flags.is_synthetic()) {

   495     // write_synthetic_attribute();

   496   }

   497   if (generic_signature_index != 0) {

   498     write_signature_attribute(generic_signature_index);

   499   }

   500   if (anno.not_null()) {

   501     write_annotations_attribute("RuntimeVisibleAnnotations", anno);

   502   }

   503   if (param_anno.not_null()) {

   504     write_annotations_attribute("RuntimeVisibleParameterAnnotations", param_anno);

   505   }

   506 }

   508 // Write the class attributes portion of ClassFile structure

   509 // JVMSpec|     u2 attributes_count;

   510 // JVMSpec|     attribute_info attributes[attributes_count];

   511 void JvmtiClassFileReconstituter::write_class_attributes() {

   512   u2 inner_classes_length = inner_classes_attribute_length();

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

   514   typeArrayHandle anno(thread(), ikh()->class_annotations());

   516   int attr_count = 0;

   517   if (generic_signature != NULL) {

   518     ++attr_count;

   519   }

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

   521     ++attr_count;

   522   }

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

   524     ++attr_count;

   525   }

   526   if (inner_classes_length > 0) {

   527     ++attr_count;

   528   }

   529   if (anno.not_null()) {

   530     ++attr_count;     // has RuntimeVisibleAnnotations attribute

   531   }

   533   write_u2(attr_count);

   535   if (generic_signature != NULL) {

   536     write_signature_attribute(symbol_to_cpool_index(generic_signature));

   537   }

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

   539     write_source_file_attribute();

   540   }

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

   542     write_source_debug_extension_attribute();

   543   }

   544   if (inner_classes_length > 0) {

   545     write_inner_classes_attribute(inner_classes_length);

   546   }

   547   if (anno.not_null()) {

   548     write_annotations_attribute("RuntimeVisibleAnnotations", anno);

   549   }

   550 }

   552 // Write the method information portion of ClassFile structure

   553 // JVMSpec|     u2 methods_count;

   554 // JVMSpec|     method_info methods[methods_count];

   555 void JvmtiClassFileReconstituter::write_method_infos() {

   556   HandleMark hm(thread());

   557   objArrayHandle methods(thread(), ikh()->methods());

   558   int num_methods = methods->length();

   560   write_u2(num_methods);

   561   if (JvmtiExport::can_maintain_original_method_order()) {

   562     int index;

   563     int original_index;

   564     int* method_order = NEW_RESOURCE_ARRAY(int, num_methods);

   566     // invert the method order mapping

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

   568       original_index = ikh()->method_ordering()->int_at(index);

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

   570              "invalid original method index");

   571       method_order[original_index] = index;

   572     }

   574     // write in original order

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

   576       index = method_order[original_index];

   577       methodHandle method(thread(), (methodOop)(ikh()->methods()->obj_at(index)));

   578       write_method_info(method);

   579     }

   580   } else {

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

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

   583       methodHandle method(thread(), (methodOop)(ikh()->methods()->obj_at(index)));

   584       write_method_info(method);

   585     }

   586   }

   587 }

   589 void JvmtiClassFileReconstituter::write_class_file_format() {

   590   ReallocMark();

   592   // JVMSpec|   ClassFile {

   593   // JVMSpec|           u4 magic;

   594   write_u4(0xCAFEBABE);

   596   // JVMSpec|           u2 minor_version;

   597   // JVMSpec|           u2 major_version;

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

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

   600   write_u2(major);

   602   // JVMSpec|           u2 constant_pool_count;

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

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

   605   copy_cpool_bytes(writeable_address(cpool_size()));

   607   // JVMSpec|           u2 access_flags;

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

   610   // JVMSpec|           u2 this_class;

   611   // JVMSpec|           u2 super_class;

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

   613   klassOop super_class = ikh()->super();

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

   615                 class_symbol_to_cpool_index(super_class->klass_part()->name()));

   617   // JVMSpec|           u2 interfaces_count;

   618   // JVMSpec|           u2 interfaces[interfaces_count];

   619   objArrayHandle interfaces(thread(), ikh()->local_interfaces());

   620   int num_interfaces = interfaces->length();

   621   write_u2(num_interfaces);

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

   623     HandleMark hm(thread());

   624     instanceKlassHandle iikh(thread(), klassOop(interfaces->obj_at(index)));

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

   626   }

   628   // JVMSpec|           u2 fields_count;

   629   // JVMSpec|           field_info fields[fields_count];

   630   write_field_infos();

   632   // JVMSpec|           u2 methods_count;

   633   // JVMSpec|           method_info methods[methods_count];

   634   write_method_infos();

   636   // JVMSpec|           u2 attributes_count;

   637   // JVMSpec|           attribute_info attributes[attributes_count];

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

   639   write_class_attributes();

   640 }

   642 address JvmtiClassFileReconstituter::writeable_address(size_t size) {

   643   size_t used_size = _buffer_ptr - _buffer;

   644   if (size + used_size >= _buffer_size) {

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

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

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

   648                                                          * initial_buffer_size;

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

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

   652     _buffer_size = new_buffer_size;

   653     _buffer_ptr = _buffer + used_size;

   654   }

   655   u1* ret_ptr = _buffer_ptr;

   656   _buffer_ptr += size;

   657   return ret_ptr;

   658 }

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

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

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

   663   u2 attr_name_index = symbol_to_cpool_index(sym);

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

   665   write_u2(attr_name_index);

   666 }

   668 void JvmtiClassFileReconstituter::write_u1(u1 x) {

   669   *writeable_address(1) = x;

   670 }

   672 void JvmtiClassFileReconstituter::write_u2(u2 x) {

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

   674 }

   676 void JvmtiClassFileReconstituter::write_u4(u4 x) {

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

   678 }

   680 void JvmtiClassFileReconstituter::write_u8(u8 x) {

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

   682 }

   684 void JvmtiClassFileReconstituter::copy_bytecodes(methodHandle mh,

   685                                                  unsigned char* bytecodes) {

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

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

   689   BytecodeStream bs(mh);

   691   unsigned char* p = bytecodes;

   692   Bytecodes::Code code;

   693   bool is_rewritten = instanceKlass::cast(mh->method_holder())->is_rewritten();

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

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

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

   699     // length of bytecode (mnemonic + operands)

   700     address bcp = bs.bcp();

   701     int     len = bs.instruction_size();

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

   704     // copy the bytecodes

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

   706     if (len > 1) {

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

   708     }

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

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

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

   713     if (is_rewritten && len >= 3) {

   714       switch (code) {

   715       case Bytecodes::_getstatic       :  // fall through

   716       case Bytecodes::_putstatic       :  // fall through

   717       case Bytecodes::_getfield        :  // fall through

   718       case Bytecodes::_putfield        :  // fall through

   719       case Bytecodes::_invokevirtual   :  // fall through

   720       case Bytecodes::_invokespecial   :  // fall through

   721       case Bytecodes::_invokestatic    :  // fall through

   722       case Bytecodes::_invokedynamic   :  // fall through

   723       case Bytecodes::_invokeinterface :

   724         assert(len == 3 ||

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

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

   727                "sanity check");

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

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

   731         if (is_invokedynamic)

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

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

   734         ConstantPoolCacheEntry* entry =

   735           mh->constants()->cache()->main_entry_at(cpci);

   736         int i = entry->constant_pool_index();

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

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

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

   740         break;

   741       }

   742     }

   744     p += len;

   745   }

   746 }

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

src/share/vm/prims/jvmtiClassFileReconstituter.cpp@f7c4174b33ba

src/share/vm/prims/jvmtiClassFileReconstituter.cpp