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 /*

  * Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  *

  */

 #include "precompiled.hpp"

 #include "interpreter/interpreter.hpp"

 #include "memory/gcLocker.hpp"

 #include "memory/metadataFactory.hpp"

 #include "oops/constMethod.hpp"

 #include "oops/method.hpp"

 // Static initialization

 const u2 ConstMethod::MAX_IDNUM   = 0xFFFE;

 const u2 ConstMethod::UNSET_IDNUM = 0xFFFF;

 ConstMethod* ConstMethod::allocate(ClassLoaderData* loader_data,

                                    int byte_code_size,

                                    int compressed_line_number_size,

                                    int localvariable_table_length,

                                    int exception_table_length,

                                    int checked_exceptions_length,

                                    int method_parameters_length,

                                    u2  generic_signature_index,

                                    MethodType method_type,

                                    TRAPS) {

   int size = ConstMethod::size(byte_code_size,

                                compressed_line_number_size,

                                localvariable_table_length,

                                exception_table_length,

                                checked_exceptions_length,

                                method_parameters_length,

                                generic_signature_index);

   return new (loader_data, size, true, THREAD) ConstMethod(

       byte_code_size, compressed_line_number_size, localvariable_table_length,

       exception_table_length, checked_exceptions_length,

       method_parameters_length, generic_signature_index,

       method_type, size);

 }

 ConstMethod::ConstMethod(int byte_code_size,

                          int compressed_line_number_size,

                          int localvariable_table_length,

                          int exception_table_length,

                          int checked_exceptions_length,

                          int method_parameters_length,

                          u2  generic_signature_index,

                          MethodType method_type,

                          int size) {

   No_Safepoint_Verifier no_safepoint;

   set_interpreter_kind(Interpreter::invalid);

   init_fingerprint();

   set_constants(NULL);

   set_stackmap_data(NULL);

   set_code_size(byte_code_size);

   set_constMethod_size(size);

   set_inlined_tables_length(generic_signature_index,

                             checked_exceptions_length,

                             compressed_line_number_size,

                             localvariable_table_length,

                             exception_table_length,

                             method_parameters_length);

   set_method_type(method_type);

   assert(this->size() == size, "wrong size for object");

 }

 // Deallocate metadata fields associated with ConstMethod*

 void ConstMethod::deallocate_contents(ClassLoaderData* loader_data) {

   set_interpreter_kind(Interpreter::invalid);

   if (stackmap_data() != NULL) {

     MetadataFactory::free_array<u1>(loader_data, stackmap_data());

   }

   set_stackmap_data(NULL);

 }

 // How big must this constMethodObject be?

 int ConstMethod::size(int code_size,

                       int compressed_line_number_size,

                       int local_variable_table_length,

                       int exception_table_length,

                       int checked_exceptions_length,

                       int method_parameters_length,

                       u2  generic_signature_index) {

   int extra_bytes = code_size;

   if (compressed_line_number_size > 0) {

     extra_bytes += compressed_line_number_size;

   }

   if (checked_exceptions_length > 0) {

     extra_bytes += sizeof(u2);

     extra_bytes += checked_exceptions_length * sizeof(CheckedExceptionElement);

   }

   if (local_variable_table_length > 0) {

     extra_bytes += sizeof(u2);

     extra_bytes +=

               local_variable_table_length * sizeof(LocalVariableTableElement);

   }

   if (exception_table_length > 0) {

     extra_bytes += sizeof(u2);

     extra_bytes += exception_table_length * sizeof(ExceptionTableElement);

   }

   if (generic_signature_index != 0) {

     extra_bytes += sizeof(u2);

   }

   if (method_parameters_length > 0) {

     extra_bytes += sizeof(u2);

     extra_bytes += method_parameters_length * sizeof(MethodParametersElement);

   }

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

   return align_object_size(header_size() + extra_words);

 }

 Method* ConstMethod::method() const {

     return _constants->pool_holder()->method_with_idnum(_method_idnum);

   }

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

 // see class CompressedLineNumberReadStream.

 u_char* ConstMethod::compressed_linenumber_table() const {

   // Located immediately following the bytecodes.

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

   return code_end();

 }

 u2* ConstMethod::generic_signature_index_addr() const {

   // Located at the end of the constMethod.

   assert(has_generic_signature(), "called only if generic signature exists");

   return last_u2_element();

 }

 u2* ConstMethod::checked_exceptions_length_addr() const {

   // Located immediately before the generic signature index.

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

   if(has_method_parameters()) {

     // If method parameters present, locate immediately before them.

     return (u2*)method_parameters_start() - 1;

   } else {

     // Else, the exception table is at the end of the constMethod.

     return has_generic_signature() ? (last_u2_element() - 1) :

                                      last_u2_element();

   }

 }

 u2* ConstMethod::method_parameters_length_addr() const {

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

   return has_generic_signature() ? (last_u2_element() - 1) :

                                     last_u2_element();

 }

 u2* ConstMethod::exception_table_length_addr() const {

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

   if (has_checked_exceptions()) {

     // If checked_exception present, locate immediately before them.

     return (u2*) checked_exceptions_start() - 1;

   } else {

     if(has_method_parameters()) {

       // If method parameters present, locate immediately before them.

       return (u2*)method_parameters_start() - 1;

     } else {

       // Else, the exception table is at the end of the constMethod.

     return has_generic_signature() ? (last_u2_element() - 1) :

                                       last_u2_element();

   }

   }

 }

 u2* ConstMethod::localvariable_table_length_addr() const {

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

   if (has_exception_handler()) {

     // If exception_table present, locate immediately before them.

     return (u2*) exception_table_start() - 1;

   } else {

     if (has_checked_exceptions()) {

       // If checked_exception present, locate immediately before them.

       return (u2*) checked_exceptions_start() - 1;

     } else {

       if(has_method_parameters()) {

         // If method parameters present, locate immediately before them.

         return (u2*)method_parameters_start() - 1;

       } else {

         // Else, the exception table is at the end of the constMethod.

       return has_generic_signature() ? (last_u2_element() - 1) :

                                         last_u2_element();

     }

   }

   }

 }

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

 void ConstMethod::set_inlined_tables_length(u2  generic_signature_index,

                                             int checked_exceptions_len,

                                             int compressed_line_number_size,

                                             int localvariable_table_len,

                                             int exception_table_len,

                                             int method_parameters_len) {

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

   if (compressed_line_number_size > 0)

     _flags |= _has_linenumber_table;

   if (generic_signature_index != 0)

     _flags |= _has_generic_signature;

   if (method_parameters_len > 0)

     _flags |= _has_method_parameters;

   if (checked_exceptions_len > 0)

     _flags |= _has_checked_exceptions;

   if (exception_table_len > 0)

     _flags |= _has_exception_table;

   if (localvariable_table_len > 0)

     _flags |= _has_localvariable_table;

   // This code is extremely brittle and should possibly be revised.

   // The *_length_addr functions walk backwards through the

   // constMethod data, using each of the length indexes ahead of them,

   // as well as the flags variable.  Therefore, the indexes must be

   // initialized in reverse order, or else they will compute the wrong

   // offsets.  Moving the initialization of _flags into a separate

   // block solves *half* of the problem, but the following part will

   // still break if the order is not exactly right.

   //

   // Also, the servicability agent needs to be informed anytime

   // anything is added here.  It might be advisable to have some sort

   // of indication of this inline.

   if (generic_signature_index != 0)

     *(generic_signature_index_addr()) = generic_signature_index;

   // New data should probably go here.

   if (method_parameters_len > 0)

     *(method_parameters_length_addr()) = method_parameters_len;

   if (checked_exceptions_len > 0)

     *(checked_exceptions_length_addr()) = checked_exceptions_len;

   if (exception_table_len > 0)

     *(exception_table_length_addr()) = exception_table_len;

   if (localvariable_table_len > 0)

     *(localvariable_table_length_addr()) = localvariable_table_len;

 }

 int ConstMethod::method_parameters_length() const {

   return has_method_parameters() ? *(method_parameters_length_addr()) : 0;

 }

 MethodParametersElement* ConstMethod::method_parameters_start() const {

   u2* addr = method_parameters_length_addr();

   u2 length = *addr;

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

   addr -= length * sizeof(MethodParametersElement) / sizeof(u2);

   return (MethodParametersElement*) addr;

 }

 int ConstMethod::checked_exceptions_length() const {

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

 }

 CheckedExceptionElement* ConstMethod::checked_exceptions_start() const {

   u2* addr = checked_exceptions_length_addr();

   u2 length = *addr;

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

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

   return (CheckedExceptionElement*) addr;

 }

 int ConstMethod::localvariable_table_length() const {

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

 }

 LocalVariableTableElement* ConstMethod::localvariable_table_start() const {

   u2* addr = localvariable_table_length_addr();

   u2 length = *addr;

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

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

   return (LocalVariableTableElement*) addr;

 }

 int ConstMethod::exception_table_length() const {

   return has_exception_handler() ? *(exception_table_length_addr()) : 0;

 }

 ExceptionTableElement* ConstMethod::exception_table_start() const {

   u2* addr = exception_table_length_addr();

   u2 length = *addr;

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

   addr -= length * sizeof(ExceptionTableElement) / sizeof(u2);

   return (ExceptionTableElement*)addr;

 }

 // Printing

 void ConstMethod::print_on(outputStream* st) const {

   ResourceMark rm;

   assert(is_constMethod(), "must be constMethod");

   st->print_cr(internal_name());

   st->print(" - method:       " INTPTR_FORMAT " ", (address)method());

   method()->print_value_on(st); st->cr();

   if (has_stackmap_table()) {

     st->print(" - stackmap data:       ");

     stackmap_data()->print_value_on(st);

     st->cr();

   }

 }

 // Short version of printing ConstMethod* - just print the name of the

 // method it belongs to.

 void ConstMethod::print_value_on(outputStream* st) const {

   assert(is_constMethod(), "must be constMethod");

   st->print(" const part of method " );

   method()->print_value_on(st);

 }

 // Verification

 void ConstMethod::verify_on(outputStream* st) {

   guarantee(is_constMethod(), "object must be constMethod");

   guarantee(is_metadata(), err_msg("Should be metadata " PTR_FORMAT, this));

   // Verification can occur during oop construction before the method or

   // other fields have been initialized.

   guarantee(is_metadata(), err_msg("Should be metadata " PTR_FORMAT, this));

   guarantee(method()->is_method(), "should be method");

   address m_end = (address)((oop*) this + size());

   address compressed_table_start = code_end();

   guarantee(compressed_table_start <= m_end, "invalid method layout");

   address compressed_table_end = compressed_table_start;

   // Verify line number table

   if (has_linenumber_table()) {

     CompressedLineNumberReadStream stream(compressed_linenumber_table());

     while (stream.read_pair()) {

       guarantee(stream.bci() >= 0 && stream.bci() <= code_size(), "invalid bci in line number table");

     }

     compressed_table_end += stream.position();

   }

   guarantee(compressed_table_end <= m_end, "invalid method layout");

   // Verify checked exceptions, exception table and local variable tables

   if (has_method_parameters()) {

     u2* addr = method_parameters_length_addr();

     guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout");

   }

   if (has_checked_exceptions()) {

     u2* addr = checked_exceptions_length_addr();

     guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout");

   }

   if (has_exception_handler()) {

     u2* addr = exception_table_length_addr();

      guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout");

   }

   if (has_localvariable_table()) {

     u2* addr = localvariable_table_length_addr();

     guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout");

   }

   // Check compressed_table_end relative to uncompressed_table_start

   u2* uncompressed_table_start;

   if (has_localvariable_table()) {

     uncompressed_table_start = (u2*) localvariable_table_start();

   } else if (has_exception_handler()) {

     uncompressed_table_start = (u2*) exception_table_start();

   } else if (has_checked_exceptions()) {

       uncompressed_table_start = (u2*) checked_exceptions_start();

   } else if (has_method_parameters()) {

       uncompressed_table_start = (u2*) method_parameters_start();

   } else {

       uncompressed_table_start = (u2*) m_end;

   }

   int gap = (intptr_t) uncompressed_table_start - (intptr_t) compressed_table_end;

   int max_gap = align_object_size(1)*BytesPerWord;

   guarantee(gap >= 0 && gap < max_gap, "invalid method layout");

 }