jdk8-mips64-public/hotspot: src/share/vm/prims/jvmtiClassFileReconstituter.cpp@e74da3c2b827

     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   ExceptionTable exception_table(method());

   195   int exception_table_length = exception_table.length();

   196   int code_size = const_method->code_size();

   197   int size =

   198     2+2+4 +                                // max_stack, max_locals, code_length

   199     code_size +                            // code

   200     2 +                                    // exception_table_length

   201     (2+2+2+2) * exception_table_length +   // exception_table

   202     2 +                                    // attributes_count

   203     attr_size;                             // attributes

   205   write_attribute_name_index("Code");

   206   write_u4(size);

   207   write_u2(method->max_stack());

   208   write_u2(method->max_locals());

   209   write_u4(code_size);

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

   211   write_u2(exception_table_length);

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

   213     write_u2(exception_table.start_pc(index));

   214     write_u2(exception_table.end_pc(index));

   215     write_u2(exception_table.handler_pc(index));

   216     write_u2(exception_table.catch_type_index(index));

   217   }

   218   write_u2(attr_count);

   219   if (line_num_cnt != 0) {

   220     write_line_number_table_attribute(method, line_num_cnt);

   221   }

   222   if (stackmap_len != 0) {

   223     write_stackmap_table_attribute(method, stackmap_len);

   224   }

   225   if (local_variable_table_length != 0) {

   226     write_local_variable_table_attribute(method, local_variable_table_length);

   227   }

   228 }

   230 // Write Exceptions attribute

   231 // JVMSpec|   Exceptions_attribute {

   232 // JVMSpec|     u2 attribute_name_index;

   233 // JVMSpec|     u4 attribute_length;

   234 // JVMSpec|     u2 number_of_exceptions;

   235 // JVMSpec|     u2 exception_index_table[number_of_exceptions];

   236 // JVMSpec|   }

   237 void JvmtiClassFileReconstituter::write_exceptions_attribute(constMethodHandle const_method) {

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

   239   int checked_exceptions_length = const_method->checked_exceptions_length();

   240   int size =

   241     2 +                                    // number_of_exceptions

   242     2 * checked_exceptions_length;         // exception_index_table

   244   write_attribute_name_index("Exceptions");

   245   write_u4(size);

   246   write_u2(checked_exceptions_length);

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

   248     write_u2(checked_exceptions[index].class_cp_index);

   249   }

   250 }

   252 // Write SourceFile attribute

   253 // JVMSpec|   SourceFile_attribute {

   254 // JVMSpec|     u2 attribute_name_index;

   255 // JVMSpec|     u4 attribute_length;

   256 // JVMSpec|     u2 sourcefile_index;

   257 // JVMSpec|   }

   258 void JvmtiClassFileReconstituter::write_source_file_attribute() {

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

   261   write_attribute_name_index("SourceFile");

   262   write_u4(2);  // always length 2

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

   264 }

   266 // Write SourceDebugExtension attribute

   267 // JSR45|   SourceDebugExtension_attribute {

   268 // JSR45|       u2 attribute_name_index;

   269 // JSR45|       u4 attribute_length;

   270 // JSR45|       u1 debug_extension[attribute_length];

   271 // JSR45|   }

   272 void JvmtiClassFileReconstituter::write_source_debug_extension_attribute() {

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

   275   write_attribute_name_index("SourceDebugExtension");

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

   277   write_u4(len);

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

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

   280     write_u1(ext[i]);

   281   }

   282 }

   284 // Write (generic) Signature attribute

   285 // JVMSpec|   Signature_attribute {

   286 // JVMSpec|     u2 attribute_name_index;

   287 // JVMSpec|     u4 attribute_length;

   288 // JVMSpec|     u2 signature_index;

   289 // JVMSpec|   }

   290 void JvmtiClassFileReconstituter::write_signature_attribute(u2 generic_signature_index) {

   291   write_attribute_name_index("Signature");

   292   write_u4(2);  // always length 2

   293   write_u2(generic_signature_index);

   294 }

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

   297 u2 JvmtiClassFileReconstituter::inner_classes_attribute_length() {

   298   InnerClassesIterator iter(ikh());

   299   return iter.length();

   300 }

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

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

   304 // JSR202|   *Annotations_attribute {

   305 // JSR202|     u2 attribute_name_index;

   306 // JSR202|     u4 attribute_length;

   307 // JSR202|     ...

   308 // JSR202|   }

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

   310                                                               typeArrayHandle annos) {

   311   u4 length = annos->length();

   312   write_attribute_name_index(attr_name);

   313   write_u4(length);

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

   315 }

   318 // Write InnerClasses attribute

   319 // JVMSpec|   InnerClasses_attribute {

   320 // JVMSpec|     u2 attribute_name_index;

   321 // JVMSpec|     u4 attribute_length;

   322 // JVMSpec|     u2 number_of_classes;

   323 // JVMSpec|     {  u2 inner_class_info_index;

   324 // JVMSpec|        u2 outer_class_info_index;

   325 // JVMSpec|        u2 inner_name_index;

   326 // JVMSpec|        u2 inner_class_access_flags;

   327 // JVMSpec|     } classes[number_of_classes];

   328 // JVMSpec|   }

   329 void JvmtiClassFileReconstituter::write_inner_classes_attribute(int length) {

   330   InnerClassesIterator iter(ikh());

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

   332             "caller must check");

   333   u2 entry_count = length / instanceKlass::inner_class_next_offset;

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

   336   write_attribute_name_index("InnerClasses");

   337   write_u4(size);

   338   write_u2(entry_count);

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

   340     write_u2(iter.inner_class_info_index());

   341     write_u2(iter.outer_class_info_index());

   342     write_u2(iter.inner_name_index());

   343     write_u2(iter.inner_access_flags());

   344   }

   345 }

   347 // Write Synthetic attribute

   348 // JVMSpec|   Synthetic_attribute {

   349 // JVMSpec|     u2 attribute_name_index;

   350 // JVMSpec|     u4 attribute_length;

   351 // JVMSpec|   }

   352 void JvmtiClassFileReconstituter::write_synthetic_attribute() {

   353   write_attribute_name_index("Synthetic");

   354   write_u4(0); //length always zero

   355 }

   357 // Compute size of LineNumberTable

   358 u2 JvmtiClassFileReconstituter::line_number_table_entries(methodHandle method) {

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

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

   361   u2 num_entries = 0;

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

   363   while (stream.read_pair()) {

   364     num_entries++;

   365   }

   366   return num_entries;

   367 }

   369 // Write LineNumberTable attribute

   370 // JVMSpec|   LineNumberTable_attribute {

   371 // JVMSpec|     u2 attribute_name_index;

   372 // JVMSpec|     u4 attribute_length;

   373 // JVMSpec|     u2 line_number_table_length;

   374 // JVMSpec|     {  u2 start_pc;

   375 // JVMSpec|        u2 line_number;

   376 // JVMSpec|     } line_number_table[line_number_table_length];

   377 // JVMSpec|   }

   378 void JvmtiClassFileReconstituter::write_line_number_table_attribute(methodHandle method,

   379                                                                     u2 num_entries) {

   381   write_attribute_name_index("LineNumberTable");

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

   383   write_u2(num_entries);

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

   386   while (stream.read_pair()) {

   387     write_u2(stream.bci());

   388     write_u2(stream.line());

   389   }

   390 }

   392 // Write LineNumberTable attribute

   393 // JVMSpec|   LocalVariableTable_attribute {

   394 // JVMSpec|     u2 attribute_name_index;

   395 // JVMSpec|     u4 attribute_length;

   396 // JVMSpec|     u2 local_variable_table_length;

   397 // JVMSpec|     {  u2 start_pc;

   398 // JVMSpec|       u2 length;

   399 // JVMSpec|       u2 name_index;

   400 // JVMSpec|       u2 descriptor_index;

   401 // JVMSpec|       u2 index;

   402 // JVMSpec|     } local_variable_table[local_variable_table_length];

   403 // JVMSpec|   }

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

   405     write_attribute_name_index("LocalVariableTable");

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

   407     write_u2(num_entries);

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

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

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

   413       write_u2(elem->start_bci);

   414       write_u2(elem->length);

   415       write_u2(elem->name_cp_index);

   416       write_u2(elem->descriptor_cp_index);

   417       write_u2(elem->slot);

   418       elem++;

   419     }

   420 }

   422 // Write stack map table attribute

   423 // JSR-202|   StackMapTable_attribute {

   424 // JSR-202|     u2 attribute_name_index;

   425 // JSR-202|     u4 attribute_length;

   426 // JSR-202|     u2 number_of_entries;

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

   428 // JSR-202|   }

   429 void JvmtiClassFileReconstituter::write_stackmap_table_attribute(methodHandle method,

   430                                                                  int stackmap_len) {

   432   write_attribute_name_index("StackMapTable");

   433   write_u4(stackmap_len);

   434   memcpy(

   435     writeable_address(stackmap_len),

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

   437     stackmap_len);

   438 }

   440 // Write one method_info structure

   441 // JVMSpec|   method_info {

   442 // JVMSpec|     u2 access_flags;

   443 // JVMSpec|     u2 name_index;

   444 // JVMSpec|     u2 descriptor_index;

   445 // JVMSpec|     u2 attributes_count;

   446 // JVMSpec|     attribute_info attributes[attributes_count];

   447 // JVMSpec|   }

   448 void JvmtiClassFileReconstituter::write_method_info(methodHandle method) {

   449   AccessFlags access_flags = method->access_flags();

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

   451   u2 generic_signature_index = const_method->generic_signature_index();

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

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

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

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

   457   write_u2(const_method->name_index());

   458   write_u2(const_method->signature_index());

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

   461   // byte comparison

   462   int attr_count = 0;

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

   464     ++attr_count;     // has Code attribute

   465   }

   466   if (const_method->has_checked_exceptions()) {

   467     ++attr_count;     // has Exceptions attribute

   468   }

   469   if (default_anno.not_null()) {

   470     ++attr_count;     // has AnnotationDefault attribute

   471   }

   472   // Deprecated attribute would go here

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

   474     // ++attr_count;

   475   }

   476   if (generic_signature_index != 0) {

   477     ++attr_count;

   478   }

   479   if (anno.not_null()) {

   480     ++attr_count;     // has RuntimeVisibleAnnotations attribute

   481   }

   482   if (param_anno.not_null()) {

   483     ++attr_count;     // has RuntimeVisibleParameterAnnotations attribute

   484   }

   486   write_u2(attr_count);

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

   488     write_code_attribute(method);

   489   }

   490   if (const_method->has_checked_exceptions()) {

   491     write_exceptions_attribute(const_method);

   492   }

   493   if (default_anno.not_null()) {

   494     write_annotations_attribute("AnnotationDefault", default_anno);

   495   }

   496   // Deprecated attribute would go here

   497   if (access_flags.is_synthetic()) {

   498     // write_synthetic_attribute();

   499   }

   500   if (generic_signature_index != 0) {

   501     write_signature_attribute(generic_signature_index);

   502   }

   503   if (anno.not_null()) {

   504     write_annotations_attribute("RuntimeVisibleAnnotations", anno);

   505   }

   506   if (param_anno.not_null()) {

   507     write_annotations_attribute("RuntimeVisibleParameterAnnotations", param_anno);

   508   }

   509 }

   511 // Write the class attributes portion of ClassFile structure

   512 // JVMSpec|     u2 attributes_count;

   513 // JVMSpec|     attribute_info attributes[attributes_count];

   514 void JvmtiClassFileReconstituter::write_class_attributes() {

   515   u2 inner_classes_length = inner_classes_attribute_length();

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

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

   519   int attr_count = 0;

   520   if (generic_signature != NULL) {

   521     ++attr_count;

   522   }

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

   524     ++attr_count;

   525   }

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

   527     ++attr_count;

   528   }

   529   if (inner_classes_length > 0) {

   530     ++attr_count;

   531   }

   532   if (anno.not_null()) {

   533     ++attr_count;     // has RuntimeVisibleAnnotations attribute

   534   }

   536   write_u2(attr_count);

   538   if (generic_signature != NULL) {

   539     write_signature_attribute(symbol_to_cpool_index(generic_signature));

   540   }

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

   542     write_source_file_attribute();

   543   }

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

   545     write_source_debug_extension_attribute();

   546   }

   547   if (inner_classes_length > 0) {

   548     write_inner_classes_attribute(inner_classes_length);

   549   }

   550   if (anno.not_null()) {

   551     write_annotations_attribute("RuntimeVisibleAnnotations", anno);

   552   }

   553 }

   555 // Write the method information portion of ClassFile structure

   556 // JVMSpec|     u2 methods_count;

   557 // JVMSpec|     method_info methods[methods_count];

   558 void JvmtiClassFileReconstituter::write_method_infos() {

   559   HandleMark hm(thread());

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

   561   int num_methods = methods->length();

   563   write_u2(num_methods);

   564   if (JvmtiExport::can_maintain_original_method_order()) {

   565     int index;

   566     int original_index;

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

   569     // invert the method order mapping

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

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

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

   573              "invalid original method index");

   574       method_order[original_index] = index;

   575     }

   577     // write in original order

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

   579       index = method_order[original_index];

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

   581       write_method_info(method);

   582     }

   583   } else {

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

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

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

   587       write_method_info(method);

   588     }

   589   }

   590 }

   592 void JvmtiClassFileReconstituter::write_class_file_format() {

   593   ReallocMark();

   595   // JVMSpec|   ClassFile {

   596   // JVMSpec|           u4 magic;

   597   write_u4(0xCAFEBABE);

   599   // JVMSpec|           u2 minor_version;

   600   // JVMSpec|           u2 major_version;

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

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

   603   write_u2(major);

   605   // JVMSpec|           u2 constant_pool_count;

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

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

   608   copy_cpool_bytes(writeable_address(cpool_size()));

   610   // JVMSpec|           u2 access_flags;

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

   613   // JVMSpec|           u2 this_class;

   614   // JVMSpec|           u2 super_class;

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

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

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

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

   620   // JVMSpec|           u2 interfaces_count;

   621   // JVMSpec|           u2 interfaces[interfaces_count];

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

   623   int num_interfaces = interfaces->length();

   624   write_u2(num_interfaces);

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

   626     HandleMark hm(thread());

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

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

   629   }

   631   // JVMSpec|           u2 fields_count;

   632   // JVMSpec|           field_info fields[fields_count];

   633   write_field_infos();

   635   // JVMSpec|           u2 methods_count;

   636   // JVMSpec|           method_info methods[methods_count];

   637   write_method_infos();

   639   // JVMSpec|           u2 attributes_count;

   640   // JVMSpec|           attribute_info attributes[attributes_count];

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

   642   write_class_attributes();

   643 }

   645 address JvmtiClassFileReconstituter::writeable_address(size_t size) {

   646   size_t used_size = _buffer_ptr - _buffer;

   647   if (size + used_size >= _buffer_size) {

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

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

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

   651                                                          * initial_buffer_size;

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

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

   655     _buffer_size = new_buffer_size;

   656     _buffer_ptr = _buffer + used_size;

   657   }

   658   u1* ret_ptr = _buffer_ptr;

   659   _buffer_ptr += size;

   660   return ret_ptr;

   661 }

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

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

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

   666   u2 attr_name_index = symbol_to_cpool_index(sym);

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

   668   write_u2(attr_name_index);

   669 }

   671 void JvmtiClassFileReconstituter::write_u1(u1 x) {

   672   *writeable_address(1) = x;

   673 }

   675 void JvmtiClassFileReconstituter::write_u2(u2 x) {

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

   677 }

   679 void JvmtiClassFileReconstituter::write_u4(u4 x) {

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

   681 }

   683 void JvmtiClassFileReconstituter::write_u8(u8 x) {

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

   685 }

   687 void JvmtiClassFileReconstituter::copy_bytecodes(methodHandle mh,

   688                                                  unsigned char* bytecodes) {

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

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

   692   BytecodeStream bs(mh);

   694   unsigned char* p = bytecodes;

   695   Bytecodes::Code code;

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

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

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

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

   702     // length of bytecode (mnemonic + operands)

   703     address bcp = bs.bcp();

   704     int     len = bs.instruction_size();

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

   707     // copy the bytecodes

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

   709     if (len > 1) {

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

   711     }

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

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

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

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

   717       switch (code) {

   718       case Bytecodes::_getstatic       :  // fall through

   719       case Bytecodes::_putstatic       :  // fall through

   720       case Bytecodes::_getfield        :  // fall through

   721       case Bytecodes::_putfield        :  // fall through

   722       case Bytecodes::_invokevirtual   :  // fall through

   723       case Bytecodes::_invokespecial   :  // fall through

   724       case Bytecodes::_invokestatic    :  // fall through

   725       case Bytecodes::_invokedynamic   :  // fall through

   726       case Bytecodes::_invokeinterface :

   727         assert(len == 3 ||

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

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

   730                "sanity check");

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

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

   734         if (is_invokedynamic)

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

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

   737         ConstantPoolCacheEntry* entry =

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

   739         int i = entry->constant_pool_index();

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

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

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

   743         break;

   744       }

   745     }

   747     p += len;

   748   }

   749 }

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

src/share/vm/prims/jvmtiClassFileReconstituter.cpp@e74da3c2b827

src/share/vm/prims/jvmtiClassFileReconstituter.cpp