duke@435: /*
jiangli@3826:  * Copyright (c) 2003, 2012, 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"
coleenp@4037: #include "interpreter/interpreter.hpp"
coleenp@4037: #include "memory/gcLocker.hpp"
coleenp@4037: #include "memory/metadataFactory.hpp"
coleenp@4037: #include "oops/constMethod.hpp"
coleenp@4037: #include "oops/method.hpp"
duke@435: 
duke@435: // Static initialization
coleenp@4037: const u2 ConstMethod::MAX_IDNUM   = 0xFFFE;
coleenp@4037: const u2 ConstMethod::UNSET_IDNUM = 0xFFFF;
coleenp@4037: 
coleenp@4037: ConstMethod* ConstMethod::allocate(ClassLoaderData* loader_data,
kamg@4245:                                    int byte_code_size,
kamg@4245:                                    int compressed_line_number_size,
kamg@4245:                                    int localvariable_table_length,
kamg@4245:                                    int exception_table_length,
kamg@4245:                                    int checked_exceptions_length,
kamg@4245:                                    MethodType method_type,
kamg@4245:                                    TRAPS) {
coleenp@4037:   int size = ConstMethod::size(byte_code_size,
coleenp@4037:                                       compressed_line_number_size,
coleenp@4037:                                       localvariable_table_length,
coleenp@4037:                                       exception_table_length,
coleenp@4037:                                       checked_exceptions_length);
coleenp@4037:   return new (loader_data, size, true, THREAD) ConstMethod(
kamg@4245:       byte_code_size, compressed_line_number_size, localvariable_table_length,
kamg@4245:       exception_table_length, checked_exceptions_length, method_type, size);
coleenp@4037: }
coleenp@4037: 
coleenp@4037: ConstMethod::ConstMethod(int byte_code_size,
kamg@4245:                          int compressed_line_number_size,
kamg@4245:                          int localvariable_table_length,
kamg@4245:                          int exception_table_length,
kamg@4245:                          int checked_exceptions_length,
kamg@4245:                          MethodType method_type,
kamg@4245:                          int size) {
coleenp@4037: 
coleenp@4037:   No_Safepoint_Verifier no_safepoint;
coleenp@4037:   set_interpreter_kind(Interpreter::invalid);
coleenp@4037:   init_fingerprint();
coleenp@4037:   set_constants(NULL);
coleenp@4037:   set_stackmap_data(NULL);
coleenp@4037:   set_code_size(byte_code_size);
coleenp@4037:   set_constMethod_size(size);
coleenp@4037:   set_inlined_tables_length(checked_exceptions_length,
coleenp@4037:                             compressed_line_number_size,
coleenp@4037:                             localvariable_table_length,
coleenp@4037:                             exception_table_length);
kamg@4245:   set_method_type(method_type);
coleenp@4037:   assert(this->size() == size, "wrong size for object");
coleenp@4037: }
coleenp@4037: 
coleenp@4037: 
coleenp@4037: // Deallocate metadata fields associated with ConstMethod*
coleenp@4037: void ConstMethod::deallocate_contents(ClassLoaderData* loader_data) {
coleenp@4037:   set_interpreter_kind(Interpreter::invalid);
coleenp@4037:   if (stackmap_data() != NULL) {
coleenp@4037:     MetadataFactory::free_array<u1>(loader_data, stackmap_data());
coleenp@4037:   }
coleenp@4037:   set_stackmap_data(NULL);
coleenp@4037: }
duke@435: 
duke@435: // How big must this constMethodObject be?
duke@435: 
coleenp@4037: int ConstMethod::size(int code_size,
duke@435:                                     int compressed_line_number_size,
duke@435:                                     int local_variable_table_length,
jiangli@3917:                                     int exception_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:   }
jiangli@3917:   if (exception_table_length > 0) {
jiangli@3917:     extra_bytes += sizeof(u2);
jiangli@3917:     extra_bytes += exception_table_length * sizeof(ExceptionTableElement);
jiangli@3917:   }
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: 
coleenp@4037: Method* ConstMethod::method() const {
coleenp@4251:     return _constants->pool_holder()->method_with_idnum(_method_idnum);
jiangli@3826:   }
duke@435: 
duke@435: // linenumber table - note that length is unknown until decompression,
duke@435: // see class CompressedLineNumberReadStream.
duke@435: 
coleenp@4037: u_char* ConstMethod::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: 
coleenp@4037: u2* ConstMethod::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: 
coleenp@4037: u2* ConstMethod::exception_table_length_addr() const {
jiangli@3917:   assert(has_exception_handler(), "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 {
jiangli@3917:     // Else, the exception table is at the end of the constMethod.
duke@435:     return last_u2_element();
duke@435:   }
duke@435: }
duke@435: 
coleenp@4037: u2* ConstMethod::localvariable_table_length_addr() const {
jiangli@3917:   assert(has_localvariable_table(), "called only if table is present");
jiangli@3917:   if (has_exception_handler()) {
jiangli@3917:     // If exception_table present, locate immediately before them.
jiangli@3917:     return (u2*) exception_table_start() - 1;
jiangli@3917:   } else {
jiangli@3917:     if (has_checked_exceptions()) {
jiangli@3917:       // If checked_exception present, locate immediately before them.
jiangli@3917:       return (u2*) checked_exceptions_start() - 1;
jiangli@3917:     } else {
jiangli@3917:       // Else, the linenumber table is at the end of the constMethod.
jiangli@3917:       return last_u2_element();
jiangli@3917:     }
jiangli@3917:   }
jiangli@3917: }
jiangli@3917: 
duke@435: 
duke@435: // Update the flags to indicate the presence of these optional fields.
coleenp@4037: void ConstMethod::set_inlined_tables_length(
duke@435:                                               int checked_exceptions_len,
duke@435:                                               int compressed_line_number_size,
jiangli@3917:                                               int localvariable_table_len,
jiangli@3917:                                               int exception_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:   }
jiangli@3917:   if (exception_table_len > 0) {
jiangli@3917:     _flags |= _has_exception_table;
jiangli@3917:     *(exception_table_length_addr()) = exception_table_len;
jiangli@3917:   }
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: 
coleenp@4037: int ConstMethod::checked_exceptions_length() const {
duke@435:   return has_checked_exceptions() ? *(checked_exceptions_length_addr()) : 0;
duke@435: }
duke@435: 
duke@435: 
coleenp@4037: CheckedExceptionElement* ConstMethod::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: 
coleenp@4037: int ConstMethod::localvariable_table_length() const {
duke@435:   return has_localvariable_table() ? *(localvariable_table_length_addr()) : 0;
duke@435: }
duke@435: 
duke@435: 
coleenp@4037: LocalVariableTableElement* ConstMethod::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: }
jiangli@3917: 
coleenp@4037: int ConstMethod::exception_table_length() const {
jiangli@3917:   return has_exception_handler() ? *(exception_table_length_addr()) : 0;
jiangli@3917: }
jiangli@3917: 
coleenp@4037: ExceptionTableElement* ConstMethod::exception_table_start() const {
jiangli@3917:   u2* addr = exception_table_length_addr();
jiangli@3917:   u2 length = *addr;
jiangli@3917:   assert(length > 0, "should only be called if table is present");
jiangli@3917:   addr -= length * sizeof(ExceptionTableElement) / sizeof(u2);
jiangli@3917:   return (ExceptionTableElement*)addr;
jiangli@3917: }
coleenp@4037: 
coleenp@4037: 
coleenp@4037: // Printing
coleenp@4037: 
coleenp@4037: void ConstMethod::print_on(outputStream* st) const {
coleenp@4037:   ResourceMark rm;
coleenp@4037:   assert(is_constMethod(), "must be constMethod");
coleenp@4037:   st->print_cr(internal_name());
coleenp@4037:   st->print(" - method:       " INTPTR_FORMAT " ", (address)method());
coleenp@4037:   method()->print_value_on(st); st->cr();
coleenp@4037:   if (has_stackmap_table()) {
coleenp@4037:     st->print(" - stackmap data:       ");
coleenp@4037:     stackmap_data()->print_value_on(st);
coleenp@4037:     st->cr();
coleenp@4037:   }
coleenp@4037: }
coleenp@4037: 
coleenp@4037: // Short version of printing ConstMethod* - just print the name of the
coleenp@4037: // method it belongs to.
coleenp@4037: void ConstMethod::print_value_on(outputStream* st) const {
coleenp@4037:   assert(is_constMethod(), "must be constMethod");
coleenp@4037:   st->print(" const part of method " );
coleenp@4037:   method()->print_value_on(st);
coleenp@4037: }
coleenp@4037: 
coleenp@4037: 
coleenp@4037: // Verification
coleenp@4037: 
coleenp@4037: void ConstMethod::verify_on(outputStream* st) {
coleenp@4037:   guarantee(is_constMethod(), "object must be constMethod");
coleenp@4037:   guarantee(is_metadata(), err_msg("Should be metadata " PTR_FORMAT, this));
coleenp@4037: 
coleenp@4037:   // Verification can occur during oop construction before the method or
coleenp@4037:   // other fields have been initialized.
coleenp@4037:   guarantee(is_metadata(), err_msg("Should be metadata " PTR_FORMAT, this));
coleenp@4037:   guarantee(method()->is_method(), "should be method");
coleenp@4037: 
coleenp@4037:   address m_end = (address)((oop*) this + size());
coleenp@4037:   address compressed_table_start = code_end();
coleenp@4037:   guarantee(compressed_table_start <= m_end, "invalid method layout");
coleenp@4037:   address compressed_table_end = compressed_table_start;
coleenp@4037:   // Verify line number table
coleenp@4037:   if (has_linenumber_table()) {
coleenp@4037:     CompressedLineNumberReadStream stream(compressed_linenumber_table());
coleenp@4037:     while (stream.read_pair()) {
coleenp@4037:       guarantee(stream.bci() >= 0 && stream.bci() <= code_size(), "invalid bci in line number table");
coleenp@4037:     }
coleenp@4037:     compressed_table_end += stream.position();
coleenp@4037:   }
coleenp@4037:   guarantee(compressed_table_end <= m_end, "invalid method layout");
coleenp@4037:   // Verify checked exceptions, exception table and local variable tables
coleenp@4037:   if (has_checked_exceptions()) {
coleenp@4037:     u2* addr = checked_exceptions_length_addr();
coleenp@4037:     guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout");
coleenp@4037:   }
coleenp@4037:   if (has_exception_handler()) {
coleenp@4037:     u2* addr = exception_table_length_addr();
coleenp@4037:      guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout");
coleenp@4037:   }
coleenp@4037:   if (has_localvariable_table()) {
coleenp@4037:     u2* addr = localvariable_table_length_addr();
coleenp@4037:     guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout");
coleenp@4037:   }
coleenp@4037:   // Check compressed_table_end relative to uncompressed_table_start
coleenp@4037:   u2* uncompressed_table_start;
coleenp@4037:   if (has_localvariable_table()) {
coleenp@4037:     uncompressed_table_start = (u2*) localvariable_table_start();
coleenp@4037:   } else if (has_exception_handler()) {
coleenp@4037:     uncompressed_table_start = (u2*) exception_table_start();
coleenp@4037:   } else if (has_checked_exceptions()) {
coleenp@4037:       uncompressed_table_start = (u2*) checked_exceptions_start();
coleenp@4037:   } else {
coleenp@4037:       uncompressed_table_start = (u2*) m_end;
coleenp@4037:   }
coleenp@4037:   int gap = (intptr_t) uncompressed_table_start - (intptr_t) compressed_table_end;
coleenp@4037:   int max_gap = align_object_size(1)*BytesPerWord;
coleenp@4037:   guarantee(gap >= 0 && gap < max_gap, "invalid method layout");
coleenp@4037: }