duke@435: /*
stefank@2314:  * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
trims@1907:  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
trims@1907:  * or visit www.oracle.com if you need additional information or have any
trims@1907:  * questions.
duke@435:  *
duke@435:  */
duke@435: 
stefank@2314: #include "precompiled.hpp"
stefank@2314: #include "oops/constMethodOop.hpp"
stefank@2314: #include "oops/methodOop.hpp"
duke@435: 
duke@435: // Static initialization
duke@435: const u2 constMethodOopDesc::MAX_IDNUM   = 0xFFFE;
duke@435: const u2 constMethodOopDesc::UNSET_IDNUM = 0xFFFF;
duke@435: 
duke@435: // How big must this constMethodObject be?
duke@435: 
duke@435: int constMethodOopDesc::object_size(int code_size,
duke@435:                                     int compressed_line_number_size,
duke@435:                                     int local_variable_table_length,
duke@435:                                     int checked_exceptions_length) {
duke@435:   int extra_bytes = code_size;
duke@435:   if (compressed_line_number_size > 0) {
duke@435:     extra_bytes += compressed_line_number_size;
duke@435:   }
duke@435:   if (checked_exceptions_length > 0) {
duke@435:     extra_bytes += sizeof(u2);
duke@435:     extra_bytes += checked_exceptions_length * sizeof(CheckedExceptionElement);
duke@435:   }
duke@435:   if (local_variable_table_length > 0) {
duke@435:     extra_bytes += sizeof(u2);
duke@435:     extra_bytes +=
duke@435:               local_variable_table_length * sizeof(LocalVariableTableElement);
duke@435:   }
duke@435:   int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord;
duke@435:   return align_object_size(header_size() + extra_words);
duke@435: }
duke@435: 
duke@435: 
duke@435: // linenumber table - note that length is unknown until decompression,
duke@435: // see class CompressedLineNumberReadStream.
duke@435: 
duke@435: u_char* constMethodOopDesc::compressed_linenumber_table() const {
duke@435:   // Located immediately following the bytecodes.
duke@435:   assert(has_linenumber_table(), "called only if table is present");
duke@435:   return code_end();
duke@435: }
duke@435: 
duke@435: u2* constMethodOopDesc::checked_exceptions_length_addr() const {
duke@435:   // Located at the end of the constMethod.
duke@435:   assert(has_checked_exceptions(), "called only if table is present");
duke@435:   return last_u2_element();
duke@435: }
duke@435: 
duke@435: u2* constMethodOopDesc::localvariable_table_length_addr() const {
duke@435:   assert(has_localvariable_table(), "called only if table is present");
duke@435:   if (has_checked_exceptions()) {
duke@435:     // If checked_exception present, locate immediately before them.
duke@435:     return (u2*) checked_exceptions_start() - 1;
duke@435:   } else {
duke@435:     // Else, the linenumber table is at the end of the constMethod.
duke@435:     return last_u2_element();
duke@435:   }
duke@435: }
duke@435: 
duke@435: 
duke@435: // Update the flags to indicate the presence of these optional fields.
duke@435: void constMethodOopDesc::set_inlined_tables_length(
duke@435:                                               int checked_exceptions_len,
duke@435:                                               int compressed_line_number_size,
duke@435:                                               int localvariable_table_len) {
duke@435:   // Must be done in the order below, otherwise length_addr accessors
duke@435:   // will not work. Only set bit in header if length is positive.
duke@435:   assert(_flags == 0, "Error");
duke@435:   if (compressed_line_number_size > 0) {
duke@435:     _flags |= _has_linenumber_table;
duke@435:   }
duke@435:   if (checked_exceptions_len > 0) {
duke@435:     _flags |= _has_checked_exceptions;
duke@435:     *(checked_exceptions_length_addr()) = checked_exceptions_len;
duke@435:   }
duke@435:   if (localvariable_table_len > 0) {
duke@435:     _flags |= _has_localvariable_table;
duke@435:     *(localvariable_table_length_addr()) = localvariable_table_len;
duke@435:   }
duke@435: }
duke@435: 
duke@435: 
duke@435: int constMethodOopDesc::checked_exceptions_length() const {
duke@435:   return has_checked_exceptions() ? *(checked_exceptions_length_addr()) : 0;
duke@435: }
duke@435: 
duke@435: 
duke@435: CheckedExceptionElement* constMethodOopDesc::checked_exceptions_start() const {
duke@435:   u2* addr = checked_exceptions_length_addr();
duke@435:   u2 length = *addr;
duke@435:   assert(length > 0, "should only be called if table is present");
duke@435:   addr -= length * sizeof(CheckedExceptionElement) / sizeof(u2);
duke@435:   return (CheckedExceptionElement*) addr;
duke@435: }
duke@435: 
duke@435: 
duke@435: int constMethodOopDesc::localvariable_table_length() const {
duke@435:   return has_localvariable_table() ? *(localvariable_table_length_addr()) : 0;
duke@435: }
duke@435: 
duke@435: 
duke@435: LocalVariableTableElement* constMethodOopDesc::localvariable_table_start() const {
duke@435:   u2* addr = localvariable_table_length_addr();
duke@435:   u2 length = *addr;
duke@435:   assert(length > 0, "should only be called if table is present");
duke@435:   addr -= length * sizeof(LocalVariableTableElement) / sizeof(u2);
duke@435:   return (LocalVariableTableElement*) addr;
duke@435: }