| /* |
| * Copyright (c) 2003, 2016, 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 "gc/shared/gcLocker.hpp" |
| #include "interpreter/interpreter.hpp" |
| #include "memory/heapInspection.hpp" |
| #include "memory/metadataFactory.hpp" |
| #include "memory/resourceArea.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, |
| InlineTableSizes* sizes, |
| MethodType method_type, |
| TRAPS) { |
| int size = ConstMethod::size(byte_code_size, sizes); |
| return new (loader_data, size, true, MetaspaceObj::ConstMethodType, THREAD) ConstMethod( |
| byte_code_size, sizes, method_type, size); |
| } |
| |
| ConstMethod::ConstMethod(int byte_code_size, |
| InlineTableSizes* sizes, |
| MethodType method_type, |
| int size) { |
| |
| NoSafepointVerifier no_safepoint; |
| init_fingerprint(); |
| set_constants(NULL); |
| set_stackmap_data(NULL); |
| set_code_size(byte_code_size); |
| set_constMethod_size(size); |
| set_inlined_tables_length(sizes); // sets _flags |
| set_method_type(method_type); |
| assert(this->size() == size, "wrong size for object"); |
| set_name_index(0); |
| set_signature_index(0); |
| set_constants(NULL); |
| set_max_stack(0); |
| set_max_locals(0); |
| set_method_idnum(0); |
| set_size_of_parameters(0); |
| set_result_type(T_VOID); |
| } |
| |
| // Accessor that copies to metadata. |
| void ConstMethod::copy_stackmap_data(ClassLoaderData* loader_data, |
| u1* sd, int length, TRAPS) { |
| _stackmap_data = MetadataFactory::new_array<u1>(loader_data, length, CHECK); |
| memcpy((void*)_stackmap_data->adr_at(0), (void*)sd, length); |
| } |
| |
| // Deallocate metadata fields associated with ConstMethod* |
| void ConstMethod::deallocate_contents(ClassLoaderData* loader_data) { |
| if (stackmap_data() != NULL) { |
| MetadataFactory::free_array<u1>(loader_data, stackmap_data()); |
| } |
| set_stackmap_data(NULL); |
| |
| // deallocate annotation arrays |
| if (has_method_annotations()) |
| MetadataFactory::free_array<u1>(loader_data, method_annotations()); |
| if (has_parameter_annotations()) |
| MetadataFactory::free_array<u1>(loader_data, parameter_annotations()); |
| if (has_type_annotations()) |
| MetadataFactory::free_array<u1>(loader_data, type_annotations()); |
| if (has_default_annotations()) |
| MetadataFactory::free_array<u1>(loader_data, default_annotations()); |
| } |
| |
| // How big must this constMethodObject be? |
| |
| int ConstMethod::size(int code_size, |
| InlineTableSizes* sizes) { |
| int extra_bytes = code_size; |
| if (sizes->compressed_linenumber_size() > 0) { |
| extra_bytes += sizes->compressed_linenumber_size(); |
| } |
| if (sizes->checked_exceptions_length() > 0) { |
| extra_bytes += sizeof(u2); |
| extra_bytes += sizes->checked_exceptions_length() * sizeof(CheckedExceptionElement); |
| } |
| if (sizes->localvariable_table_length() > 0) { |
| extra_bytes += sizeof(u2); |
| extra_bytes += |
| sizes->localvariable_table_length() * sizeof(LocalVariableTableElement); |
| } |
| if (sizes->exception_table_length() > 0) { |
| extra_bytes += sizeof(u2); |
| extra_bytes += sizes->exception_table_length() * sizeof(ExceptionTableElement); |
| } |
| if (sizes->generic_signature_index() != 0) { |
| extra_bytes += sizeof(u2); |
| } |
| // This has to be a less-than-or-equal check, because we might be |
| // storing information from a zero-length MethodParameters |
| // attribute. We have to store these, because in some cases, they |
| // cause the reflection API to throw a MalformedParametersException. |
| if (sizes->method_parameters_length() >= 0) { |
| extra_bytes += sizeof(u2); |
| extra_bytes += sizes->method_parameters_length() * sizeof(MethodParametersElement); |
| } |
| |
| // Align sizes up to a word. |
| extra_bytes = align_size_up(extra_bytes, BytesPerWord); |
| |
| // One pointer per annotation array |
| if (sizes->method_annotations_length() > 0) { |
| extra_bytes += sizeof(AnnotationArray*); |
| } |
| if (sizes->parameter_annotations_length() > 0) { |
| extra_bytes += sizeof(AnnotationArray*); |
| } |
| if (sizes->type_annotations_length() > 0) { |
| extra_bytes += sizeof(AnnotationArray*); |
| } |
| if (sizes->default_annotations_length() > 0) { |
| extra_bytes += sizeof(AnnotationArray*); |
| } |
| |
| int extra_words = align_size_up(extra_bytes, BytesPerWord) / BytesPerWord; |
| assert(extra_words == extra_bytes/BytesPerWord, "should already be aligned"); |
| return align_metadata_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(); |
| } |
| |
| // Last short in ConstMethod* before annotations |
| u2* ConstMethod::last_u2_element() const { |
| int offset = 0; |
| if (has_method_annotations()) offset++; |
| if (has_parameter_annotations()) offset++; |
| if (has_type_annotations()) offset++; |
| if (has_default_annotations()) offset++; |
| return (u2*)((AnnotationArray**)constMethod_end() - offset) - 1; |
| } |
| |
| 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::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::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::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(InlineTableSizes* sizes) { |
| _flags = 0; |
| if (sizes->compressed_linenumber_size() > 0) |
| _flags |= _has_linenumber_table; |
| if (sizes->generic_signature_index() != 0) |
| _flags |= _has_generic_signature; |
| if (sizes->method_parameters_length() >= 0) |
| _flags |= _has_method_parameters; |
| if (sizes->checked_exceptions_length() > 0) |
| _flags |= _has_checked_exceptions; |
| if (sizes->exception_table_length() > 0) |
| _flags |= _has_exception_table; |
| if (sizes->localvariable_table_length() > 0) |
| _flags |= _has_localvariable_table; |
| |
| // annotations, they are all pointer sized embedded objects so don't have |
| // a length embedded also. |
| if (sizes->method_annotations_length() > 0) |
| _flags |= _has_method_annotations; |
| if (sizes->parameter_annotations_length() > 0) |
| _flags |= _has_parameter_annotations; |
| if (sizes->type_annotations_length() > 0) |
| _flags |= _has_type_annotations; |
| if (sizes->default_annotations_length() > 0) |
| _flags |= _has_default_annotations; |
| |
| // 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 (sizes->generic_signature_index() != 0) |
| *(generic_signature_index_addr()) = sizes->generic_signature_index(); |
| // New data should probably go here. |
| if (sizes->method_parameters_length() >= 0) |
| *(method_parameters_length_addr()) = sizes->method_parameters_length(); |
| if (sizes->checked_exceptions_length() > 0) |
| *(checked_exceptions_length_addr()) = sizes->checked_exceptions_length(); |
| if (sizes->exception_table_length() > 0) |
| *(exception_table_length_addr()) = sizes->exception_table_length(); |
| if (sizes->localvariable_table_length() > 0) |
| *(localvariable_table_length_addr()) = sizes->localvariable_table_length(); |
| } |
| |
| int ConstMethod::method_parameters_length() const { |
| return has_method_parameters() ? *(method_parameters_length_addr()) : -1; |
| } |
| |
| MethodParametersElement* ConstMethod::method_parameters_start() const { |
| u2* addr = method_parameters_length_addr(); |
| u2 length = *addr; |
| 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; |
| } |
| |
| AnnotationArray** ConstMethod::method_annotations_addr() const { |
| assert(has_method_annotations(), "should only be called if method annotations are present"); |
| return (AnnotationArray**)constMethod_end() - 1; |
| } |
| |
| AnnotationArray** ConstMethod::parameter_annotations_addr() const { |
| assert(has_parameter_annotations(), "should only be called if method parameter annotations are present"); |
| int offset = 1; |
| if (has_method_annotations()) offset++; |
| return (AnnotationArray**)constMethod_end() - offset; |
| } |
| |
| AnnotationArray** ConstMethod::type_annotations_addr() const { |
| assert(has_type_annotations(), "should only be called if method type annotations are present"); |
| int offset = 1; |
| if (has_method_annotations()) offset++; |
| if (has_parameter_annotations()) offset++; |
| return (AnnotationArray**)constMethod_end() - offset; |
| } |
| |
| AnnotationArray** ConstMethod::default_annotations_addr() const { |
| assert(has_default_annotations(), "should only be called if method default annotations are present"); |
| int offset = 1; |
| if (has_method_annotations()) offset++; |
| if (has_parameter_annotations()) offset++; |
| if (has_type_annotations()) offset++; |
| return (AnnotationArray**)constMethod_end() - offset; |
| } |
| |
| // copy annotations from 'cm' to 'this' |
| void ConstMethod::copy_annotations_from(ConstMethod* cm) { |
| if (cm->has_method_annotations()) { |
| assert(has_method_annotations(), "should be allocated already"); |
| set_method_annotations(cm->method_annotations()); |
| } |
| if (cm->has_parameter_annotations()) { |
| assert(has_parameter_annotations(), "should be allocated already"); |
| set_parameter_annotations(cm->parameter_annotations()); |
| } |
| if (cm->has_type_annotations()) { |
| assert(has_type_annotations(), "should be allocated already"); |
| set_type_annotations(cm->type_annotations()); |
| } |
| if (cm->has_default_annotations()) { |
| assert(has_default_annotations(), "should be allocated already"); |
| set_default_annotations(cm->default_annotations()); |
| } |
| } |
| |
| // Printing |
| |
| void ConstMethod::print_on(outputStream* st) const { |
| ResourceMark rm; |
| assert(is_constMethod(), "must be constMethod"); |
| st->print_cr("%s", internal_name()); |
| st->print(" - method: " INTPTR_FORMAT " ", p2i((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); |
| } |
| |
| #if INCLUDE_SERVICES |
| // Size Statistics |
| void ConstMethod::collect_statistics(KlassSizeStats *sz) const { |
| int n1, n2, n3; |
| sz->_const_method_bytes += (n1 = sz->count(this)); |
| sz->_bytecode_bytes += (n2 = code_size()); |
| sz->_stackmap_bytes += (n3 = sz->count_array(stackmap_data())); |
| |
| // Count method annotations |
| int a1 = 0, a2 = 0, a3 = 0, a4 = 0; |
| if (has_method_annotations()) { |
| sz->_methods_annotations_bytes += (a1 = sz->count_array(method_annotations())); |
| } |
| if (has_parameter_annotations()) { |
| sz->_methods_parameter_annotations_bytes += (a2 = sz->count_array(parameter_annotations())); |
| } |
| if (has_type_annotations()) { |
| sz->_methods_type_annotations_bytes += (a3 = sz->count_array(type_annotations())); |
| } |
| if (has_default_annotations()) { |
| sz->_methods_default_annotations_bytes += (a4 = sz->count_array(default_annotations())); |
| } |
| |
| int size_annotations = a1 + a2 + a3 + a4; |
| |
| sz->_method_all_bytes += n1 + n3 + size_annotations; // note: n2 is part of n3 |
| sz->_ro_bytes += n1 + n3 + size_annotations; |
| } |
| #endif // INCLUDE_SERVICES |
| |
| // Verification |
| |
| void ConstMethod::verify_on(outputStream* st) { |
| guarantee(is_constMethod(), "object must be constMethod"); |
| |
| // Verification can occur during oop construction before the method or |
| // other fields have been initialized. |
| guarantee(method()->is_method(), "should be method"); |
| |
| address m_end = (address)((intptr_t) 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_metadata_size(1)*BytesPerWord; |
| guarantee(gap >= 0 && gap < max_gap, "invalid method layout"); |
| } |