author | coleenp |
Mon, 14 Jan 2013 11:01:39 -0500 | |
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/* |
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* Copyright (c) 2003, 2012, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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* |
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*/ |
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#include "precompiled.hpp" |
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#include "interpreter/interpreter.hpp" |
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#include "memory/gcLocker.hpp" |
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#include "memory/metadataFactory.hpp" |
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#include "oops/constMethod.hpp" |
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#include "oops/method.hpp" |
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// Static initialization |
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const u2 ConstMethod::MAX_IDNUM = 0xFFFE; |
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const u2 ConstMethod::UNSET_IDNUM = 0xFFFF; |
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ConstMethod* ConstMethod::allocate(ClassLoaderData* loader_data, |
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int byte_code_size, |
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int compressed_line_number_size, |
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int localvariable_table_length, |
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int exception_table_length, |
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int checked_exceptions_length, |
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int method_parameters_length, |
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u2 generic_signature_index, |
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MethodType method_type, |
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TRAPS) { |
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int size = ConstMethod::size(byte_code_size, |
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compressed_line_number_size, |
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localvariable_table_length, |
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exception_table_length, |
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checked_exceptions_length, |
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method_parameters_length, |
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generic_signature_index); |
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return new (loader_data, size, true, THREAD) ConstMethod( |
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byte_code_size, compressed_line_number_size, localvariable_table_length, |
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exception_table_length, checked_exceptions_length, |
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method_parameters_length, generic_signature_index, |
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method_type, size); |
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} |
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ConstMethod::ConstMethod(int byte_code_size, |
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int compressed_line_number_size, |
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int localvariable_table_length, |
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int exception_table_length, |
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int checked_exceptions_length, |
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int method_parameters_length, |
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u2 generic_signature_index, |
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MethodType method_type, |
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int size) { |
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No_Safepoint_Verifier no_safepoint; |
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set_interpreter_kind(Interpreter::invalid); |
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init_fingerprint(); |
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set_constants(NULL); |
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set_stackmap_data(NULL); |
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set_code_size(byte_code_size); |
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set_constMethod_size(size); |
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set_inlined_tables_length(generic_signature_index, |
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checked_exceptions_length, |
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compressed_line_number_size, |
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localvariable_table_length, |
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exception_table_length, |
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method_parameters_length); |
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set_method_type(method_type); |
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assert(this->size() == size, "wrong size for object"); |
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} |
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// Deallocate metadata fields associated with ConstMethod* |
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void ConstMethod::deallocate_contents(ClassLoaderData* loader_data) { |
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set_interpreter_kind(Interpreter::invalid); |
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if (stackmap_data() != NULL) { |
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MetadataFactory::free_array<u1>(loader_data, stackmap_data()); |
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} |
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set_stackmap_data(NULL); |
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} |
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// How big must this constMethodObject be? |
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int ConstMethod::size(int code_size, |
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int compressed_line_number_size, |
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int local_variable_table_length, |
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int exception_table_length, |
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int checked_exceptions_length, |
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int method_parameters_length, |
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u2 generic_signature_index) { |
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int extra_bytes = code_size; |
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if (compressed_line_number_size > 0) { |
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extra_bytes += compressed_line_number_size; |
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} |
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if (checked_exceptions_length > 0) { |
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extra_bytes += sizeof(u2); |
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extra_bytes += checked_exceptions_length * sizeof(CheckedExceptionElement); |
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} |
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if (local_variable_table_length > 0) { |
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extra_bytes += sizeof(u2); |
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extra_bytes += |
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local_variable_table_length * sizeof(LocalVariableTableElement); |
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} |
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if (exception_table_length > 0) { |
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extra_bytes += sizeof(u2); |
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extra_bytes += exception_table_length * sizeof(ExceptionTableElement); |
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} |
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if (generic_signature_index != 0) { |
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extra_bytes += sizeof(u2); |
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} |
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if (method_parameters_length > 0) { |
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extra_bytes += sizeof(u2); |
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extra_bytes += method_parameters_length * sizeof(MethodParametersElement); |
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} |
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int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord; |
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return align_object_size(header_size() + extra_words); |
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} |
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Method* ConstMethod::method() const { |
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return _constants->pool_holder()->method_with_idnum(_method_idnum); |
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} |
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// linenumber table - note that length is unknown until decompression, |
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// see class CompressedLineNumberReadStream. |
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u_char* ConstMethod::compressed_linenumber_table() const { |
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// Located immediately following the bytecodes. |
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assert(has_linenumber_table(), "called only if table is present"); |
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return code_end(); |
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} |
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u2* ConstMethod::generic_signature_index_addr() const { |
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// Located at the end of the constMethod. |
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assert(has_generic_signature(), "called only if generic signature exists"); |
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return last_u2_element(); |
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} |
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u2* ConstMethod::checked_exceptions_length_addr() const { |
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// Located immediately before the generic signature index. |
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assert(has_checked_exceptions(), "called only if table is present"); |
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if(has_method_parameters()) { |
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// If method parameters present, locate immediately before them. |
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return (u2*)method_parameters_start() - 1; |
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} else { |
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// Else, the exception table is at the end of the constMethod. |
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return has_generic_signature() ? (last_u2_element() - 1) : |
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last_u2_element(); |
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} |
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} |
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u2* ConstMethod::method_parameters_length_addr() const { |
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assert(has_method_parameters(), "called only if table is present"); |
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return has_generic_signature() ? (last_u2_element() - 1) : |
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last_u2_element(); |
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} |
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u2* ConstMethod::exception_table_length_addr() const { |
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assert(has_exception_handler(), "called only if table is present"); |
1 | 174 |
if (has_checked_exceptions()) { |
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// If checked_exception present, locate immediately before them. |
|
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return (u2*) checked_exceptions_start() - 1; |
|
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} else { |
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if(has_method_parameters()) { |
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// If method parameters present, locate immediately before them. |
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return (u2*)method_parameters_start() - 1; |
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} else { |
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// Else, the exception table is at the end of the constMethod. |
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return has_generic_signature() ? (last_u2_element() - 1) : |
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last_u2_element(); |
1 | 185 |
} |
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} |
1 | 187 |
} |
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u2* ConstMethod::localvariable_table_length_addr() const { |
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assert(has_localvariable_table(), "called only if table is present"); |
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if (has_exception_handler()) { |
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// If exception_table present, locate immediately before them. |
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return (u2*) exception_table_start() - 1; |
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} else { |
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if (has_checked_exceptions()) { |
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// If checked_exception present, locate immediately before them. |
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return (u2*) checked_exceptions_start() - 1; |
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} else { |
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if(has_method_parameters()) { |
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// If method parameters present, locate immediately before them. |
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return (u2*)method_parameters_start() - 1; |
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} else { |
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// Else, the exception table is at the end of the constMethod. |
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return has_generic_signature() ? (last_u2_element() - 1) : |
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last_u2_element(); |
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} |
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} |
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} |
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} |
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|
1 | 211 |
// Update the flags to indicate the presence of these optional fields. |
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void ConstMethod::set_inlined_tables_length(u2 generic_signature_index, |
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int checked_exceptions_len, |
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int compressed_line_number_size, |
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int localvariable_table_len, |
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int exception_table_len, |
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int method_parameters_len) { |
1 | 218 |
assert(_flags == 0, "Error"); |
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if (compressed_line_number_size > 0) |
1 | 220 |
_flags |= _has_linenumber_table; |
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if (generic_signature_index != 0) |
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_flags |= _has_generic_signature; |
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if (method_parameters_len > 0) |
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_flags |= _has_method_parameters; |
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if (checked_exceptions_len > 0) |
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_flags |= _has_checked_exceptions; |
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if (exception_table_len > 0) |
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_flags |= _has_exception_table; |
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if (localvariable_table_len > 0) |
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_flags |= _has_localvariable_table; |
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|
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// This code is extremely brittle and should possibly be revised. |
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// The *_length_addr functions walk backwards through the |
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// constMethod data, using each of the length indexes ahead of them, |
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// as well as the flags variable. Therefore, the indexes must be |
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// initialized in reverse order, or else they will compute the wrong |
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// offsets. Moving the initialization of _flags into a separate |
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// block solves *half* of the problem, but the following part will |
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// still break if the order is not exactly right. |
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// |
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// Also, the servicability agent needs to be informed anytime |
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// anything is added here. It might be advisable to have some sort |
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// of indication of this inline. |
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if (generic_signature_index != 0) |
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*(generic_signature_index_addr()) = generic_signature_index; |
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// New data should probably go here. |
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if (method_parameters_len > 0) |
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*(method_parameters_length_addr()) = method_parameters_len; |
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if (checked_exceptions_len > 0) |
1 | 250 |
*(checked_exceptions_length_addr()) = checked_exceptions_len; |
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if (exception_table_len > 0) |
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*(exception_table_length_addr()) = exception_table_len; |
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if (localvariable_table_len > 0) |
1 | 254 |
*(localvariable_table_length_addr()) = localvariable_table_len; |
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} |
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256 |
|
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int ConstMethod::method_parameters_length() const { |
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return has_method_parameters() ? *(method_parameters_length_addr()) : 0; |
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} |
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|
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MethodParametersElement* ConstMethod::method_parameters_start() const { |
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u2* addr = method_parameters_length_addr(); |
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u2 length = *addr; |
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assert(length > 0, "should only be called if table is present"); |
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addr -= length * sizeof(MethodParametersElement) / sizeof(u2); |
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return (MethodParametersElement*) addr; |
1 | 267 |
} |
268 |
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int ConstMethod::checked_exceptions_length() const { |
1 | 271 |
return has_checked_exceptions() ? *(checked_exceptions_length_addr()) : 0; |
272 |
} |
|
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CheckedExceptionElement* ConstMethod::checked_exceptions_start() const { |
1 | 276 |
u2* addr = checked_exceptions_length_addr(); |
277 |
u2 length = *addr; |
|
278 |
assert(length > 0, "should only be called if table is present"); |
|
279 |
addr -= length * sizeof(CheckedExceptionElement) / sizeof(u2); |
|
280 |
return (CheckedExceptionElement*) addr; |
|
281 |
} |
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283 |
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int ConstMethod::localvariable_table_length() const { |
1 | 285 |
return has_localvariable_table() ? *(localvariable_table_length_addr()) : 0; |
286 |
} |
|
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LocalVariableTableElement* ConstMethod::localvariable_table_start() const { |
1 | 290 |
u2* addr = localvariable_table_length_addr(); |
291 |
u2 length = *addr; |
|
292 |
assert(length > 0, "should only be called if table is present"); |
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293 |
addr -= length * sizeof(LocalVariableTableElement) / sizeof(u2); |
|
294 |
return (LocalVariableTableElement*) addr; |
|
295 |
} |
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296 |
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int ConstMethod::exception_table_length() const { |
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return has_exception_handler() ? *(exception_table_length_addr()) : 0; |
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} |
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300 |
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ExceptionTableElement* ConstMethod::exception_table_start() const { |
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u2* addr = exception_table_length_addr(); |
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u2 length = *addr; |
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assert(length > 0, "should only be called if table is present"); |
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addr -= length * sizeof(ExceptionTableElement) / sizeof(u2); |
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return (ExceptionTableElement*)addr; |
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} |
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308 |
|
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309 |
|
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310 |
// Printing |
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311 |
|
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void ConstMethod::print_on(outputStream* st) const { |
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ResourceMark rm; |
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assert(is_constMethod(), "must be constMethod"); |
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st->print_cr(internal_name()); |
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st->print(" - method: " INTPTR_FORMAT " ", (address)method()); |
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method()->print_value_on(st); st->cr(); |
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if (has_stackmap_table()) { |
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st->print(" - stackmap data: "); |
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stackmap_data()->print_value_on(st); |
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st->cr(); |
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} |
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} |
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|
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// Short version of printing ConstMethod* - just print the name of the |
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// method it belongs to. |
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void ConstMethod::print_value_on(outputStream* st) const { |
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assert(is_constMethod(), "must be constMethod"); |
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st->print(" const part of method " ); |
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method()->print_value_on(st); |
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} |
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|
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|
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// Verification |
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|
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void ConstMethod::verify_on(outputStream* st) { |
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guarantee(is_constMethod(), "object must be constMethod"); |
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guarantee(is_metadata(), err_msg("Should be metadata " PTR_FORMAT, this)); |
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|
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// Verification can occur during oop construction before the method or |
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// other fields have been initialized. |
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guarantee(is_metadata(), err_msg("Should be metadata " PTR_FORMAT, this)); |
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guarantee(method()->is_method(), "should be method"); |
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|
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address m_end = (address)((oop*) this + size()); |
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address compressed_table_start = code_end(); |
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guarantee(compressed_table_start <= m_end, "invalid method layout"); |
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address compressed_table_end = compressed_table_start; |
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// Verify line number table |
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if (has_linenumber_table()) { |
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CompressedLineNumberReadStream stream(compressed_linenumber_table()); |
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while (stream.read_pair()) { |
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guarantee(stream.bci() >= 0 && stream.bci() <= code_size(), "invalid bci in line number table"); |
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} |
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compressed_table_end += stream.position(); |
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} |
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guarantee(compressed_table_end <= m_end, "invalid method layout"); |
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// Verify checked exceptions, exception table and local variable tables |
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if (has_method_parameters()) { |
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u2* addr = method_parameters_length_addr(); |
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guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout"); |
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} |
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if (has_checked_exceptions()) { |
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u2* addr = checked_exceptions_length_addr(); |
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guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout"); |
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} |
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if (has_exception_handler()) { |
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u2* addr = exception_table_length_addr(); |
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guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout"); |
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} |
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if (has_localvariable_table()) { |
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u2* addr = localvariable_table_length_addr(); |
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guarantee(*addr > 0 && (address) addr >= compressed_table_end && (address) addr < m_end, "invalid method layout"); |
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} |
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// Check compressed_table_end relative to uncompressed_table_start |
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u2* uncompressed_table_start; |
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if (has_localvariable_table()) { |
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uncompressed_table_start = (u2*) localvariable_table_start(); |
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} else if (has_exception_handler()) { |
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uncompressed_table_start = (u2*) exception_table_start(); |
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} else if (has_checked_exceptions()) { |
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uncompressed_table_start = (u2*) checked_exceptions_start(); |
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} else if (has_method_parameters()) { |
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uncompressed_table_start = (u2*) method_parameters_start(); |
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} else { |
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uncompressed_table_start = (u2*) m_end; |
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} |
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int gap = (intptr_t) uncompressed_table_start - (intptr_t) compressed_table_end; |
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int max_gap = align_object_size(1)*BytesPerWord; |
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guarantee(gap >= 0 && gap < max_gap, "invalid method layout"); |
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391 |
} |