jdk8-mips64-public/hotspot: src/share/vm/oops/constMethod.cpp@3efdfd6ddbf2 (annotated)

src/share/vm/oops/constMethod.cpp@3efdfd6ddbf2 (annotated)

src/share/vm/oops/constMethod.cpp

Fri, 08 Mar 2013 11:47:57 -0500

author: coleenp
date: Fri, 08 Mar 2013 11:47:57 -0500
changeset 4712: 3efdfd6ddbf2
parent 4572: 927a311d00f9
child 4715: 5939f5953b45
permissions: -rw-r--r--

8003553: NPG: metaspace objects should be zeroed in constructors
Summary: Zero metadata in constructors, not in allocation (and some in constructors)
Reviewed-by: jmasa, sspitsyn

 /*
  * Copyright (c) 2003, 2013, 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/heapInspection.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,
                                    InlineTableSizes* sizes,
                                    MethodType method_type,
                                    TRAPS) {
   int size = ConstMethod::size(byte_code_size, sizes);
   return new (loader_data, size, true, THREAD) ConstMethod(
       byte_code_size, sizes, method_type, size);
 }
 ConstMethod::ConstMethod(int byte_code_size,
                          InlineTableSizes* sizes,
                          MethodType method_type,
                          int size) {
   No_Safepoint_Verifier 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);
   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);
 }
 // 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);
   }
   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_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();
 }
 // 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()) : 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;
 }
 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;
 }
 // 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);
 }
 #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");
   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(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_object_size(1)*BytesPerWord;
   guarantee(gap >= 0 && gap < max_gap, "invalid method layout");
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/oops/constMethod.cpp@3efdfd6ddbf2 (annotated)

src/share/vm/oops/constMethod.cpp