1 /*

     2  * Copyright 2003-2006 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any questions.

    22  *

    23  */

    24 

    25 # include "incls/_precompiled.incl"

    26 # include "incls/_constMethodOop.cpp.incl"

    27 

    28 // Static initialization

    29 const u2 constMethodOopDesc::MAX_IDNUM   = 0xFFFE;

    30 const u2 constMethodOopDesc::UNSET_IDNUM = 0xFFFF;

    31 

    32 // How big must this constMethodObject be?

    33 

    34 int constMethodOopDesc::object_size(int code_size,

    35                                     int compressed_line_number_size,

    36                                     int local_variable_table_length,

    37                                     int checked_exceptions_length) {

    38   int extra_bytes = code_size;

    39   if (compressed_line_number_size > 0) {

    40     extra_bytes += compressed_line_number_size;

    41   }

    42   if (checked_exceptions_length > 0) {

    43     extra_bytes += sizeof(u2);

    44     extra_bytes += checked_exceptions_length * sizeof(CheckedExceptionElement);

    45   }

    46   if (local_variable_table_length > 0) {

    47     extra_bytes += sizeof(u2);

    48     extra_bytes +=

    49               local_variable_table_length * sizeof(LocalVariableTableElement);

    50   }

    51   int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord;

    52   return align_object_size(header_size() + extra_words);

    53 }

    54 

    55 

    56 // linenumber table - note that length is unknown until decompression,

    57 // see class CompressedLineNumberReadStream.

    58 

    59 u_char* constMethodOopDesc::compressed_linenumber_table() const {

    60   // Located immediately following the bytecodes.

    61   assert(has_linenumber_table(), "called only if table is present");

    62   return code_end();

    63 }

    64 

    65 u2* constMethodOopDesc::checked_exceptions_length_addr() const {

    66   // Located at the end of the constMethod.

    67   assert(has_checked_exceptions(), "called only if table is present");

    68   return last_u2_element();

    69 }

    70 

    71 u2* constMethodOopDesc::localvariable_table_length_addr() const {

    72   assert(has_localvariable_table(), "called only if table is present");

    73   if (has_checked_exceptions()) {

    74     // If checked_exception present, locate immediately before them.

    75     return (u2*) checked_exceptions_start() - 1;

    76   } else {

    77     // Else, the linenumber table is at the end of the constMethod.

    78     return last_u2_element();

    79   }

    80 }

    81 

    82 

    83 // Update the flags to indicate the presence of these optional fields.

    84 void constMethodOopDesc::set_inlined_tables_length(

    85                                               int checked_exceptions_len,

    86                                               int compressed_line_number_size,

    87                                               int localvariable_table_len) {

    88   // Must be done in the order below, otherwise length_addr accessors

    89   // will not work. Only set bit in header if length is positive.

    90   assert(_flags == 0, "Error");

    91   if (compressed_line_number_size > 0) {

    92     _flags |= _has_linenumber_table;

    93   }

    94   if (checked_exceptions_len > 0) {

    95     _flags |= _has_checked_exceptions;

    96     *(checked_exceptions_length_addr()) = checked_exceptions_len;

    97   }

    98   if (localvariable_table_len > 0) {

    99     _flags |= _has_localvariable_table;

   100     *(localvariable_table_length_addr()) = localvariable_table_len;

   101   }

   102 }

   103 

   104 

   105 int constMethodOopDesc::checked_exceptions_length() const {

   106   return has_checked_exceptions() ? *(checked_exceptions_length_addr()) : 0;

   107 }

   108 

   109 

   110 CheckedExceptionElement* constMethodOopDesc::checked_exceptions_start() const {

   111   u2* addr = checked_exceptions_length_addr();

   112   u2 length = *addr;

   113   assert(length > 0, "should only be called if table is present");

   114   addr -= length * sizeof(CheckedExceptionElement) / sizeof(u2);

   115   return (CheckedExceptionElement*) addr;

   116 }

   117 

   118 

   119 int constMethodOopDesc::localvariable_table_length() const {

   120   return has_localvariable_table() ? *(localvariable_table_length_addr()) : 0;

   121 }

   122 

   123 

   124 LocalVariableTableElement* constMethodOopDesc::localvariable_table_start() const {

   125   u2* addr = localvariable_table_length_addr();

   126   u2 length = *addr;

   127   assert(length > 0, "should only be called if table is present");

   128   addr -= length * sizeof(LocalVariableTableElement) / sizeof(u2);

   129   return (LocalVariableTableElement*) addr;

   130 }