jdk8-mips64-public/hotspot: src/share/vm/prims/jvmtiClassFileReconstituter.cpp@35c656d0b685

     1 /*

     2  * Copyright (c) 2005, 2011, 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, LVT, 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;

   140   // compute number and length of attributes -- FIXME: for now no LVT

   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   }

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

   175   int exception_table_length = exception_table->length();

   176   int exception_table_entries = exception_table_length / 4;

   177   int code_size = const_method->code_size();

   178   int size =

   179     2+2+4 +                                // max_stack, max_locals, code_length

   180     code_size +                            // code

   181     2 +                                    // exception_table_length

   182     (2+2+2+2) * exception_table_entries +  // exception_table

   183     2 +                                    // attributes_count

   184     attr_size;                             // attributes

   186   write_attribute_name_index("Code");

   187   write_u4(size);

   188   write_u2(method->max_stack());

   189   write_u2(method->max_locals());

   190   write_u4(code_size);

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

   192   write_u2(exception_table_entries);

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

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

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

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

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

   198   }

   199   write_u2(attr_count);

   200   if (line_num_cnt != 0) {

   201     write_line_number_table_attribute(method, line_num_cnt);

   202   }

   203   if (stackmap_len != 0) {

   204     write_stackmap_table_attribute(method, stackmap_len);

   205   }

   207   // FIXME: write LVT attribute

   208 }

   210 // Write Exceptions attribute

   211 // JVMSpec|   Exceptions_attribute {

   212 // JVMSpec|     u2 attribute_name_index;

   213 // JVMSpec|     u4 attribute_length;

   214 // JVMSpec|     u2 number_of_exceptions;

   215 // JVMSpec|     u2 exception_index_table[number_of_exceptions];

   216 // JVMSpec|   }

   217 void JvmtiClassFileReconstituter::write_exceptions_attribute(constMethodHandle const_method) {

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

   219   int checked_exceptions_length = const_method->checked_exceptions_length();

   220   int size =

   221     2 +                                    // number_of_exceptions

   222     2 * checked_exceptions_length;         // exception_index_table

   224   write_attribute_name_index("Exceptions");

   225   write_u4(size);

   226   write_u2(checked_exceptions_length);

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

   228     write_u2(checked_exceptions[index].class_cp_index);

   229   }

   230 }

   232 // Write SourceFile attribute

   233 // JVMSpec|   SourceFile_attribute {

   234 // JVMSpec|     u2 attribute_name_index;

   235 // JVMSpec|     u4 attribute_length;

   236 // JVMSpec|     u2 sourcefile_index;

   237 // JVMSpec|   }

   238 void JvmtiClassFileReconstituter::write_source_file_attribute() {

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

   241   write_attribute_name_index("SourceFile");

   242   write_u4(2);  // always length 2

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

   244 }

   246 // Write SourceDebugExtension attribute

   247 // JSR45|   SourceDebugExtension_attribute {

   248 // JSR45|       u2 attribute_name_index;

   249 // JSR45|       u4 attribute_length;

   250 // JSR45|       u2 sourcefile_index;

   251 // JSR45|   }

   252 void JvmtiClassFileReconstituter::write_source_debug_extension_attribute() {

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

   255   write_attribute_name_index("SourceDebugExtension");

   256   write_u4(2);  // always length 2

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

   258 }

   260 // Write (generic) Signature attribute

   261 // JVMSpec|   Signature_attribute {

   262 // JVMSpec|     u2 attribute_name_index;

   263 // JVMSpec|     u4 attribute_length;

   264 // JVMSpec|     u2 signature_index;

   265 // JVMSpec|   }

   266 void JvmtiClassFileReconstituter::write_signature_attribute(u2 generic_signature_index) {

   267   write_attribute_name_index("Signature");

   268   write_u4(2);  // always length 2

   269   write_u2(generic_signature_index);

   270 }

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

   273 u2 JvmtiClassFileReconstituter::inner_classes_attribute_length() {

   274   typeArrayOop inner_class_list = ikh()->inner_classes();

   275   return (inner_class_list == NULL) ? 0 : inner_class_list->length();

   276 }

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

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

   280 // JSR202|   *Annotations_attribute {

   281 // JSR202|     u2 attribute_name_index;

   282 // JSR202|     u4 attribute_length;

   283 // JSR202|     ...

   284 // JSR202|   }

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

   286                                                               typeArrayHandle annos) {

   287   u4 length = annos->length();

   288   write_attribute_name_index(attr_name);

   289   write_u4(length);

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

   291 }

   294 // Write InnerClasses attribute

   295 // JVMSpec|   InnerClasses_attribute {

   296 // JVMSpec|     u2 attribute_name_index;

   297 // JVMSpec|     u4 attribute_length;

   298 // JVMSpec|     u2 number_of_classes;

   299 // JVMSpec|     {  u2 inner_class_info_index;

   300 // JVMSpec|        u2 outer_class_info_index;

   301 // JVMSpec|        u2 inner_name_index;

   302 // JVMSpec|        u2 inner_class_access_flags;

   303 // JVMSpec|     } classes[number_of_classes];

   304 // JVMSpec|   }

   305 void JvmtiClassFileReconstituter::write_inner_classes_attribute(int length) {

   306   typeArrayOop inner_class_list = ikh()->inner_classes();

   307   guarantee(inner_class_list != NULL && inner_class_list->length() == length,

   308             "caller must check");

   309   typeArrayHandle inner_class_list_h(thread(), inner_class_list);

   310   assert (length % instanceKlass::inner_class_next_offset == 0, "just checking");

   311   u2 entry_count = length / instanceKlass::inner_class_next_offset;

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

   314   write_attribute_name_index("InnerClasses");

   315   write_u4(size);

   316   write_u2(entry_count);

   317   for (int i = 0; i < length; i += instanceKlass::inner_class_next_offset) {

   318     write_u2(inner_class_list_h->ushort_at(

   319                       i + instanceKlass::inner_class_inner_class_info_offset));

   320     write_u2(inner_class_list_h->ushort_at(

   321                       i + instanceKlass::inner_class_outer_class_info_offset));

   322     write_u2(inner_class_list_h->ushort_at(

   323                       i + instanceKlass::inner_class_inner_name_offset));

   324     write_u2(inner_class_list_h->ushort_at(

   325                       i + instanceKlass::inner_class_access_flags_offset));

   326   }

   327 }

   329 // Write Synthetic attribute

   330 // JVMSpec|   Synthetic_attribute {

   331 // JVMSpec|     u2 attribute_name_index;

   332 // JVMSpec|     u4 attribute_length;

   333 // JVMSpec|   }

   334 void JvmtiClassFileReconstituter::write_synthetic_attribute() {

   335   write_attribute_name_index("Synthetic");

   336   write_u4(0); //length always zero

   337 }

   339 // Compute size of LineNumberTable

   340 u2 JvmtiClassFileReconstituter::line_number_table_entries(methodHandle method) {

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

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

   343   u2 num_entries = 0;

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

   345   while (stream.read_pair()) {

   346     num_entries++;

   347   }

   348   return num_entries;

   349 }

   351 // Write LineNumberTable attribute

   352 // JVMSpec|   LineNumberTable_attribute {

   353 // JVMSpec|     u2 attribute_name_index;

   354 // JVMSpec|     u4 attribute_length;

   355 // JVMSpec|     u2 line_number_table_length;

   356 // JVMSpec|     {  u2 start_pc;

   357 // JVMSpec|        u2 line_number;

   358 // JVMSpec|     } line_number_table[line_number_table_length];

   359 // JVMSpec|   }

   360 void JvmtiClassFileReconstituter::write_line_number_table_attribute(methodHandle method,

   361                                                                     u2 num_entries) {

   363   write_attribute_name_index("LineNumberTable");

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

   365   write_u2(num_entries);

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

   368   while (stream.read_pair()) {

   369     write_u2(stream.bci());

   370     write_u2(stream.line());

   371   }

   372 }

   374 // Write stack map table attribute

   375 // JSR-202|   StackMapTable_attribute {

   376 // JSR-202|     u2 attribute_name_index;

   377 // JSR-202|     u4 attribute_length;

   378 // JSR-202|     u2 number_of_entries;

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

   380 // JSR-202|   }

   381 void JvmtiClassFileReconstituter::write_stackmap_table_attribute(methodHandle method,

   382                                                                  int stackmap_len) {

   384   write_attribute_name_index("StackMapTable");

   385   write_u4(stackmap_len);

   386   memcpy(

   387     writeable_address(stackmap_len),

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

   389     stackmap_len);

   390 }

   392 // Write one method_info structure

   393 // JVMSpec|   method_info {

   394 // JVMSpec|     u2 access_flags;

   395 // JVMSpec|     u2 name_index;

   396 // JVMSpec|     u2 descriptor_index;

   397 // JVMSpec|     u2 attributes_count;

   398 // JVMSpec|     attribute_info attributes[attributes_count];

   399 // JVMSpec|   }

   400 void JvmtiClassFileReconstituter::write_method_info(methodHandle method) {

   401   AccessFlags access_flags = method->access_flags();

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

   403   u2 generic_signature_index = const_method->generic_signature_index();

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

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

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

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

   409   write_u2(const_method->name_index());

   410   write_u2(const_method->signature_index());

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

   413   // byte comparison

   414   int attr_count = 0;

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

   416     ++attr_count;     // has Code attribute

   417   }

   418   if (const_method->has_checked_exceptions()) {

   419     ++attr_count;     // has Exceptions attribute

   420   }

   421   if (default_anno.not_null()) {

   422     ++attr_count;     // has AnnotationDefault attribute

   423   }

   424   // Deprecated attribute would go here

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

   426     // ++attr_count;

   427   }

   428   if (generic_signature_index != 0) {

   429     ++attr_count;

   430   }

   431   if (anno.not_null()) {

   432     ++attr_count;     // has RuntimeVisibleAnnotations attribute

   433   }

   434   if (param_anno.not_null()) {

   435     ++attr_count;     // has RuntimeVisibleParameterAnnotations attribute

   436   }

   438   write_u2(attr_count);

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

   440     write_code_attribute(method);

   441   }

   442   if (const_method->has_checked_exceptions()) {

   443     write_exceptions_attribute(const_method);

   444   }

   445   if (default_anno.not_null()) {

   446     write_annotations_attribute("AnnotationDefault", default_anno);

   447   }

   448   // Deprecated attribute would go here

   449   if (access_flags.is_synthetic()) {

   450     // write_synthetic_attribute();

   451   }

   452   if (generic_signature_index != 0) {

   453     write_signature_attribute(generic_signature_index);

   454   }

   455   if (anno.not_null()) {

   456     write_annotations_attribute("RuntimeVisibleAnnotations", anno);

   457   }

   458   if (param_anno.not_null()) {

   459     write_annotations_attribute("RuntimeVisibleParameterAnnotations", param_anno);

   460   }

   461 }

   463 // Write the class attributes portion of ClassFile structure

   464 // JVMSpec|     u2 attributes_count;

   465 // JVMSpec|     attribute_info attributes[attributes_count];

   466 void JvmtiClassFileReconstituter::write_class_attributes() {

   467   u2 inner_classes_length = inner_classes_attribute_length();

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

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

   471   int attr_count = 0;

   472   if (generic_signature != NULL) {

   473     ++attr_count;

   474   }

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

   476     ++attr_count;

   477   }

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

   479     ++attr_count;

   480   }

   481   if (inner_classes_length > 0) {

   482     ++attr_count;

   483   }

   484   if (anno.not_null()) {

   485     ++attr_count;     // has RuntimeVisibleAnnotations attribute

   486   }

   488   write_u2(attr_count);

   490   if (generic_signature != NULL) {

   491     write_signature_attribute(symbol_to_cpool_index(generic_signature));

   492   }

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

   494     write_source_file_attribute();

   495   }

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

   497     write_source_debug_extension_attribute();

   498   }

   499   if (inner_classes_length > 0) {

   500     write_inner_classes_attribute(inner_classes_length);

   501   }

   502   if (anno.not_null()) {

   503     write_annotations_attribute("RuntimeVisibleAnnotations", anno);

   504   }

   505 }

   507 // Write the method information portion of ClassFile structure

   508 // JVMSpec|     u2 methods_count;

   509 // JVMSpec|     method_info methods[methods_count];

   510 void JvmtiClassFileReconstituter::write_method_infos() {

   511   HandleMark hm(thread());

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

   513   int num_methods = methods->length();

   515   write_u2(num_methods);

   516   if (JvmtiExport::can_maintain_original_method_order()) {

   517     int index;

   518     int original_index;

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

   521     // invert the method order mapping

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

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

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

   525              "invalid original method index");

   526       method_order[original_index] = index;

   527     }

   529     // write in original order

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

   531       index = method_order[original_index];

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

   533       write_method_info(method);

   534     }

   535   } else {

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

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

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

   539       write_method_info(method);

   540     }

   541   }

   542 }

   544 void JvmtiClassFileReconstituter::write_class_file_format() {

   545   ReallocMark();

   547   // JVMSpec|   ClassFile {

   548   // JVMSpec|           u4 magic;

   549   write_u4(0xCAFEBABE);

   551   // JVMSpec|           u2 minor_version;

   552   // JVMSpec|           u2 major_version;

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

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

   555   write_u2(major);

   557   // JVMSpec|           u2 constant_pool_count;

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

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

   560   copy_cpool_bytes(writeable_address(cpool_size()));

   562   // JVMSpec|           u2 access_flags;

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

   565   // JVMSpec|           u2 this_class;

   566   // JVMSpec|           u2 super_class;

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

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

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

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

   572   // JVMSpec|           u2 interfaces_count;

   573   // JVMSpec|           u2 interfaces[interfaces_count];

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

   575   int num_interfaces = interfaces->length();

   576   write_u2(num_interfaces);

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

   578     HandleMark hm(thread());

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

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

   581   }

   583   // JVMSpec|           u2 fields_count;

   584   // JVMSpec|           field_info fields[fields_count];

   585   write_field_infos();

   587   // JVMSpec|           u2 methods_count;

   588   // JVMSpec|           method_info methods[methods_count];

   589   write_method_infos();

   591   // JVMSpec|           u2 attributes_count;

   592   // JVMSpec|           attribute_info attributes[attributes_count];

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

   594   write_class_attributes();

   595 }

   597 address JvmtiClassFileReconstituter::writeable_address(size_t size) {

   598   size_t used_size = _buffer_ptr - _buffer;

   599   if (size + used_size >= _buffer_size) {

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

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

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

   603                                                          * initial_buffer_size;

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

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

   607     _buffer_size = new_buffer_size;

   608     _buffer_ptr = _buffer + used_size;

   609   }

   610   u1* ret_ptr = _buffer_ptr;

   611   _buffer_ptr += size;

   612   return ret_ptr;

   613 }

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

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

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

   618   u2 attr_name_index = symbol_to_cpool_index(sym);

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

   620   write_u2(attr_name_index);

   621 }

   623 void JvmtiClassFileReconstituter::write_u1(u1 x) {

   624   *writeable_address(1) = x;

   625 }

   627 void JvmtiClassFileReconstituter::write_u2(u2 x) {

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

   629 }

   631 void JvmtiClassFileReconstituter::write_u4(u4 x) {

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

   633 }

   635 void JvmtiClassFileReconstituter::write_u8(u8 x) {

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

   637 }

   639 void JvmtiClassFileReconstituter::copy_bytecodes(methodHandle mh,

   640                                                  unsigned char* bytecodes) {

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

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

   644   BytecodeStream bs(mh);

   646   unsigned char* p = bytecodes;

   647   Bytecodes::Code code;

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

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

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

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

   654     // length of bytecode (mnemonic + operands)

   655     address bcp = bs.bcp();

   656     int     len = bs.instruction_size();

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

   659     // copy the bytecodes

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

   661     if (len > 1) {

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

   663     }

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

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

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

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

   669       switch (code) {

   670       case Bytecodes::_getstatic       :  // fall through

   671       case Bytecodes::_putstatic       :  // fall through

   672       case Bytecodes::_getfield        :  // fall through

   673       case Bytecodes::_putfield        :  // fall through

   674       case Bytecodes::_invokevirtual   :  // fall through

   675       case Bytecodes::_invokespecial   :  // fall through

   676       case Bytecodes::_invokestatic    :  // fall through

   677       case Bytecodes::_invokedynamic   :  // fall through

   678       case Bytecodes::_invokeinterface :

   679         assert(len == 3 || (code == Bytecodes::_invokeinterface && len ==5),

   680                "sanity check");

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

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

   683         if (is_invokedynamic)

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

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

   686         ConstantPoolCacheEntry* entry =

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

   688         int i = entry->constant_pool_index();

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

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

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

   692         break;

   693       }

   694     }

   696     p += len;

   697   }

   698 }

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

src/share/vm/prims/jvmtiClassFileReconstituter.cpp@35c656d0b685

src/share/vm/prims/jvmtiClassFileReconstituter.cpp