jdk8-mips64-public/hotspot: src/share/vm/oops/constantPoolOop.cpp@47ffceb239d0 (annotated)

src/share/vm/oops/constantPoolOop.cpp@47ffceb239d0 (annotated)

src/share/vm/oops/constantPoolOop.cpp

Wed, 20 May 2009 09:36:53 +0200

author: thurka
date: Wed, 20 May 2009 09:36:53 +0200
changeset 1208: 47ffceb239d0
parent 1161: be93aad57795
child 1494: 389049f3f393
permissions: -rw-r--r--

6839599: JVM crash while profiling Tomcat and Liferay
Summary: constantPoolOopDesc::copy_cpool_bytes() - do the brute-force search search through 'tbl' when SymbolTable::lookup_only() returns NULL
Reviewed-by: kamg

 /*
  * Copyright 1997-2009 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  * CA 95054 USA or visit www.sun.com if you need additional information or
  * have any questions.
  *
  */
 # include "incls/_precompiled.incl"
 # include "incls/_constantPoolOop.cpp.incl"
 void constantPoolOopDesc::set_flag_at(FlagBit fb) {
   const int MAX_STATE_CHANGES = 2;
   for (int i = MAX_STATE_CHANGES + 10; i > 0; i--) {
     int oflags = _flags;
     int nflags = oflags | (1 << (int)fb);
     if (Atomic::cmpxchg(nflags, &_flags, oflags) == oflags)
       return;
   }
   assert(false, "failed to cmpxchg flags");
   _flags |= (1 << (int)fb);     // better than nothing
 }
 klassOop constantPoolOopDesc::klass_at_impl(constantPoolHandle this_oop, int which, TRAPS) {
   // A resolved constantPool entry will contain a klassOop, otherwise a symbolOop.
   // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and
   // tag is not updated atomicly.
   oop entry = *(this_oop->obj_at_addr(which));
   if (entry->is_klass()) {
     // Already resolved - return entry.
     return (klassOop)entry;
   }
   // Acquire lock on constant oop while doing update. After we get the lock, we check if another object
   // already has updated the object
   assert(THREAD->is_Java_thread(), "must be a Java thread");
   bool do_resolve = false;
   bool in_error = false;
   symbolHandle name;
   Handle       loader;
   { ObjectLocker ol(this_oop, THREAD);
     if (this_oop->tag_at(which).is_unresolved_klass()) {
       if (this_oop->tag_at(which).is_unresolved_klass_in_error()) {
         in_error = true;
       } else {
         do_resolve = true;
         name   = symbolHandle(THREAD, this_oop->unresolved_klass_at(which));
         loader = Handle(THREAD, instanceKlass::cast(this_oop->pool_holder())->class_loader());
       }
     }
   } // unlocking constantPool
   // The original attempt to resolve this constant pool entry failed so find the
   // original error and throw it again (JVMS 5.4.3).
   if (in_error) {
     symbolOop error = SystemDictionary::find_resolution_error(this_oop, which);
     guarantee(error != (symbolOop)NULL, "tag mismatch with resolution error table");
     ResourceMark rm;
     // exception text will be the class name
     const char* className = this_oop->unresolved_klass_at(which)->as_C_string();
     THROW_MSG_0(error, className);
   }
   if (do_resolve) {
     // this_oop must be unlocked during resolve_or_fail
     oop protection_domain = Klass::cast(this_oop->pool_holder())->protection_domain();
     Handle h_prot (THREAD, protection_domain);
     klassOop k_oop = SystemDictionary::resolve_or_fail(name, loader, h_prot, true, THREAD);
     KlassHandle k;
     if (!HAS_PENDING_EXCEPTION) {
       k = KlassHandle(THREAD, k_oop);
       // Do access check for klasses
       verify_constant_pool_resolve(this_oop, k, THREAD);
     }
     // Failed to resolve class. We must record the errors so that subsequent attempts
     // to resolve this constant pool entry fail with the same error (JVMS 5.4.3).
     if (HAS_PENDING_EXCEPTION) {
       ResourceMark rm;
       symbolHandle error(PENDING_EXCEPTION->klass()->klass_part()->name());
       bool throw_orig_error = false;
       {
         ObjectLocker ol (this_oop, THREAD);
         // some other thread has beaten us and has resolved the class.
         if (this_oop->tag_at(which).is_klass()) {
           CLEAR_PENDING_EXCEPTION;
           entry = this_oop->resolved_klass_at(which);
           return (klassOop)entry;
         }
         if (!PENDING_EXCEPTION->
               is_a(SystemDictionary::linkageError_klass())) {
           // Just throw the exception and don't prevent these classes from
           // being loaded due to virtual machine errors like StackOverflow
           // and OutOfMemoryError, etc, or if the thread was hit by stop()
           // Needs clarification to section 5.4.3 of the VM spec (see 6308271)
         }
         else if (!this_oop->tag_at(which).is_unresolved_klass_in_error()) {
           SystemDictionary::add_resolution_error(this_oop, which, error);
           this_oop->tag_at_put(which, JVM_CONSTANT_UnresolvedClassInError);
         } else {
           // some other thread has put the class in error state.
           error = symbolHandle(SystemDictionary::find_resolution_error(this_oop, which));
           assert(!error.is_null(), "checking");
           throw_orig_error = true;
         }
       } // unlocked
       if (throw_orig_error) {
         CLEAR_PENDING_EXCEPTION;
         ResourceMark rm;
         const char* className = this_oop->unresolved_klass_at(which)->as_C_string();
         THROW_MSG_0(error, className);
       }
       return 0;
     }
     if (TraceClassResolution && !k()->klass_part()->oop_is_array()) {
       // skip resolving the constant pool so that this code get's
       // called the next time some bytecodes refer to this class.
       ResourceMark rm;
       int line_number = -1;
       const char * source_file = NULL;
       if (JavaThread::current()->has_last_Java_frame()) {
         // try to identify the method which called this function.
         vframeStream vfst(JavaThread::current());
         if (!vfst.at_end()) {
           line_number = vfst.method()->line_number_from_bci(vfst.bci());
           symbolOop s = instanceKlass::cast(vfst.method()->method_holder())->source_file_name();
           if (s != NULL) {
             source_file = s->as_C_string();
           }
         }
       }
       if (k() != this_oop->pool_holder()) {
         // only print something if the classes are different
         if (source_file != NULL) {
           tty->print("RESOLVE %s %s %s:%d\n",
                      instanceKlass::cast(this_oop->pool_holder())->external_name(),
                      instanceKlass::cast(k())->external_name(), source_file, line_number);
         } else {
           tty->print("RESOLVE %s %s\n",
                      instanceKlass::cast(this_oop->pool_holder())->external_name(),
                      instanceKlass::cast(k())->external_name());
         }
       }
       return k();
     } else {
       ObjectLocker ol (this_oop, THREAD);
       // Only updated constant pool - if it is resolved.
       do_resolve = this_oop->tag_at(which).is_unresolved_klass();
       if (do_resolve) {
         this_oop->klass_at_put(which, k());
       }
     }
   }
   entry = this_oop->resolved_klass_at(which);
   assert(entry->is_klass(), "must be resolved at this point");
   return (klassOop)entry;
 }
 // Does not update constantPoolOop - to avoid any exception throwing. Used
 // by compiler and exception handling.  Also used to avoid classloads for
 // instanceof operations. Returns NULL if the class has not been loaded or
 // if the verification of constant pool failed
 klassOop constantPoolOopDesc::klass_at_if_loaded(constantPoolHandle this_oop, int which) {
   oop entry = *this_oop->obj_at_addr(which);
   if (entry->is_klass()) {
     return (klassOop)entry;
   } else {
     assert(entry->is_symbol(), "must be either symbol or klass");
     Thread *thread = Thread::current();
     symbolHandle name (thread, (symbolOop)entry);
     oop loader = instanceKlass::cast(this_oop->pool_holder())->class_loader();
     oop protection_domain = Klass::cast(this_oop->pool_holder())->protection_domain();
     Handle h_prot (thread, protection_domain);
     Handle h_loader (thread, loader);
     klassOop k = SystemDictionary::find(name, h_loader, h_prot, thread);
     if (k != NULL) {
       // Make sure that resolving is legal
       EXCEPTION_MARK;
       KlassHandle klass(THREAD, k);
       // return NULL if verification fails
       verify_constant_pool_resolve(this_oop, klass, THREAD);
       if (HAS_PENDING_EXCEPTION) {
         CLEAR_PENDING_EXCEPTION;
         return NULL;
       }
       return klass();
     } else {
       return k;
     }
   }
 }
 klassOop constantPoolOopDesc::klass_ref_at_if_loaded(constantPoolHandle this_oop, int which) {
   return klass_at_if_loaded(this_oop, this_oop->klass_ref_index_at(which));
 }
 // This is an interface for the compiler that allows accessing non-resolved entries
 // in the constant pool - but still performs the validations tests. Must be used
 // in a pre-parse of the compiler - to determine what it can do and not do.
 // Note: We cannot update the ConstantPool from the vm_thread.
 klassOop constantPoolOopDesc::klass_ref_at_if_loaded_check(constantPoolHandle this_oop, int index, TRAPS) {
   int which = this_oop->klass_ref_index_at(index);
   oop entry = *this_oop->obj_at_addr(which);
   if (entry->is_klass()) {
     return (klassOop)entry;
   } else {
     assert(entry->is_symbol(), "must be either symbol or klass");
     symbolHandle name (THREAD, (symbolOop)entry);
     oop loader = instanceKlass::cast(this_oop->pool_holder())->class_loader();
     oop protection_domain = Klass::cast(this_oop->pool_holder())->protection_domain();
     Handle h_loader(THREAD, loader);
     Handle h_prot  (THREAD, protection_domain);
     KlassHandle k(THREAD, SystemDictionary::find(name, h_loader, h_prot, THREAD));
     // Do access check for klasses
     if( k.not_null() ) verify_constant_pool_resolve(this_oop, k, CHECK_NULL);
     return k();
   }
 }
 symbolOop constantPoolOopDesc::impl_name_ref_at(int which, bool uncached) {
   int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
   return symbol_at(name_index);
 }
 symbolOop constantPoolOopDesc::impl_signature_ref_at(int which, bool uncached) {
   int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
   return symbol_at(signature_index);
 }
 int constantPoolOopDesc::impl_name_and_type_ref_index_at(int which, bool uncached) {
   jint ref_index = field_or_method_at(which, uncached);
   return extract_high_short_from_int(ref_index);
 }
 int constantPoolOopDesc::impl_klass_ref_index_at(int which, bool uncached) {
   jint ref_index = field_or_method_at(which, uncached);
   return extract_low_short_from_int(ref_index);
 }
 int constantPoolOopDesc::map_instruction_operand_to_index(int operand) {
   if (constantPoolCacheOopDesc::is_secondary_index(operand)) {
     return cache()->main_entry_at(operand)->constant_pool_index();
   }
   assert((int)(u2)operand == operand, "clean u2");
   int index = Bytes::swap_u2(operand);
   return cache()->entry_at(index)->constant_pool_index();
 }
 void constantPoolOopDesc::verify_constant_pool_resolve(constantPoolHandle this_oop, KlassHandle k, TRAPS) {
  if (k->oop_is_instance() || k->oop_is_objArray()) {
     instanceKlassHandle holder (THREAD, this_oop->pool_holder());
     klassOop elem_oop = k->oop_is_instance() ? k() : objArrayKlass::cast(k())->bottom_klass();
     KlassHandle element (THREAD, elem_oop);
     // The element type could be a typeArray - we only need the access check if it is
     // an reference to another class
     if (element->oop_is_instance()) {
       LinkResolver::check_klass_accessability(holder, element, CHECK);
     }
   }
 }
 int constantPoolOopDesc::name_ref_index_at(int which_nt) {
   jint ref_index = name_and_type_at(which_nt);
   return extract_low_short_from_int(ref_index);
 }
 int constantPoolOopDesc::signature_ref_index_at(int which_nt) {
   jint ref_index = name_and_type_at(which_nt);
   return extract_high_short_from_int(ref_index);
 }
 klassOop constantPoolOopDesc::klass_ref_at(int which, TRAPS) {
   return klass_at(klass_ref_index_at(which), CHECK_NULL);
 }
 symbolOop constantPoolOopDesc::klass_name_at(int which) {
   assert(tag_at(which).is_unresolved_klass() || tag_at(which).is_klass(),
          "Corrupted constant pool");
   // A resolved constantPool entry will contain a klassOop, otherwise a symbolOop.
   // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and
   // tag is not updated atomicly.
   oop entry = *(obj_at_addr(which));
   if (entry->is_klass()) {
     // Already resolved - return entry's name.
     return klassOop(entry)->klass_part()->name();
   } else {
     assert(entry->is_symbol(), "must be either symbol or klass");
     return (symbolOop)entry;
   }
 }
 symbolOop constantPoolOopDesc::klass_ref_at_noresolve(int which) {
   jint ref_index = klass_ref_index_at(which);
   return klass_at_noresolve(ref_index);
 }
 char* constantPoolOopDesc::string_at_noresolve(int which) {
   // Test entry type in case string is resolved while in here.
   oop entry = *(obj_at_addr(which));
   if (entry->is_symbol()) {
     return ((symbolOop)entry)->as_C_string();
   } else if (java_lang_String::is_instance(entry)) {
     return java_lang_String::as_utf8_string(entry);
   } else {
     return (char*)"<pseudo-string>";
   }
 }
 BasicType constantPoolOopDesc::basic_type_for_signature_at(int which) {
   return FieldType::basic_type(symbol_at(which));
 }
 void constantPoolOopDesc::resolve_string_constants_impl(constantPoolHandle this_oop, TRAPS) {
   for (int index = 1; index < this_oop->length(); index++) { // Index 0 is unused
     if (this_oop->tag_at(index).is_unresolved_string()) {
       this_oop->string_at(index, CHECK);
     }
   }
 }
 oop constantPoolOopDesc::string_at_impl(constantPoolHandle this_oop, int which, TRAPS) {
   oop entry = *(this_oop->obj_at_addr(which));
   if (entry->is_symbol()) {
     ObjectLocker ol(this_oop, THREAD);
     if (this_oop->tag_at(which).is_unresolved_string()) {
       // Intern string
       symbolOop sym = this_oop->unresolved_string_at(which);
       entry = StringTable::intern(sym, CHECK_(constantPoolOop(NULL)));
       this_oop->string_at_put(which, entry);
     } else {
       // Another thread beat us and interned string, read string from constant pool
       entry = this_oop->resolved_string_at(which);
     }
   }
   assert(java_lang_String::is_instance(entry), "must be string");
   return entry;
 }
 bool constantPoolOopDesc::is_pseudo_string_at(int which) {
   oop entry = *(obj_at_addr(which));
   if (entry->is_symbol())
     // Not yet resolved, but it will resolve to a string.
     return false;
   else if (java_lang_String::is_instance(entry))
     return false; // actually, it might be a non-interned or non-perm string
   else
     // truly pseudo
     return true;
 }
 bool constantPoolOopDesc::klass_name_at_matches(instanceKlassHandle k,
                                                 int which) {
   // Names are interned, so we can compare symbolOops directly
   symbolOop cp_name = klass_name_at(which);
   return (cp_name == k->name());
 }
 int constantPoolOopDesc::pre_resolve_shared_klasses(TRAPS) {
   ResourceMark rm;
   int count = 0;
   for (int index = 1; index < tags()->length(); index++) { // Index 0 is unused
     if (tag_at(index).is_unresolved_string()) {
       // Intern string
       symbolOop sym = unresolved_string_at(index);
       oop entry = StringTable::intern(sym, CHECK_(-1));
       string_at_put(index, entry);
     }
   }
   return count;
 }
 // Iterate over symbols which are used as class, field, method names and
 // signatures (in preparation for writing to the shared archive).
 void constantPoolOopDesc::shared_symbols_iterate(OopClosure* closure) {
   for (int index = 1; index < length(); index++) { // Index 0 is unused
     switch (tag_at(index).value()) {
     case JVM_CONSTANT_UnresolvedClass:
       closure->do_oop(obj_at_addr(index));
       break;
     case JVM_CONSTANT_NameAndType:
       {
         int i = *int_at_addr(index);
         closure->do_oop(obj_at_addr((unsigned)i >> 16));
         closure->do_oop(obj_at_addr((unsigned)i & 0xffff));
       }
       break;
     case JVM_CONSTANT_Class:
     case JVM_CONSTANT_InterfaceMethodref:
     case JVM_CONSTANT_Fieldref:
     case JVM_CONSTANT_Methodref:
     case JVM_CONSTANT_Integer:
     case JVM_CONSTANT_Float:
       // Do nothing!  Not an oop.
       // These constant types do not reference symbols at this point.
       break;
     case JVM_CONSTANT_String:
       // Do nothing!  Not a symbol.
       break;
     case JVM_CONSTANT_UnresolvedString:
     case JVM_CONSTANT_Utf8:
       // These constants are symbols, but unless these symbols are
       // actually to be used for something, we don't want to mark them.
       break;
     case JVM_CONSTANT_Long:
     case JVM_CONSTANT_Double:
       // Do nothing!  Not an oop. (But takes two pool entries.)
       ++index;
       break;
     default:
       ShouldNotReachHere();
       break;
     }
   }
 }
 // Iterate over the [one] tags array (in preparation for writing to the
 // shared archive).
 void constantPoolOopDesc::shared_tags_iterate(OopClosure* closure) {
   closure->do_oop(tags_addr());
 }
 // Iterate over String objects (in preparation for writing to the shared
 // archive).
 void constantPoolOopDesc::shared_strings_iterate(OopClosure* closure) {
   for (int index = 1; index < length(); index++) { // Index 0 is unused
     switch (tag_at(index).value()) {
     case JVM_CONSTANT_UnresolvedClass:
     case JVM_CONSTANT_NameAndType:
       // Do nothing!  Not a String.
       break;
     case JVM_CONSTANT_Class:
     case JVM_CONSTANT_InterfaceMethodref:
     case JVM_CONSTANT_Fieldref:
     case JVM_CONSTANT_Methodref:
     case JVM_CONSTANT_Integer:
     case JVM_CONSTANT_Float:
       // Do nothing!  Not an oop.
       // These constant types do not reference symbols at this point.
       break;
     case JVM_CONSTANT_String:
       closure->do_oop(obj_at_addr(index));
       break;
     case JVM_CONSTANT_UnresolvedString:
     case JVM_CONSTANT_Utf8:
       // These constants are symbols, but unless these symbols are
       // actually to be used for something, we don't want to mark them.
       break;
     case JVM_CONSTANT_Long:
     case JVM_CONSTANT_Double:
       // Do nothing!  Not an oop. (But takes two pool entries.)
       ++index;
       break;
     default:
       ShouldNotReachHere();
       break;
     }
   }
 }
 // Compare this constant pool's entry at index1 to the constant pool
 // cp2's entry at index2.
 bool constantPoolOopDesc::compare_entry_to(int index1, constantPoolHandle cp2,
        int index2, TRAPS) {
   jbyte t1 = tag_at(index1).value();
   jbyte t2 = cp2->tag_at(index2).value();
   // JVM_CONSTANT_UnresolvedClassInError is equal to JVM_CONSTANT_UnresolvedClass
   // when comparing
   if (t1 == JVM_CONSTANT_UnresolvedClassInError) {
     t1 = JVM_CONSTANT_UnresolvedClass;
   }
   if (t2 == JVM_CONSTANT_UnresolvedClassInError) {
     t2 = JVM_CONSTANT_UnresolvedClass;
   }
   if (t1 != t2) {
     // Not the same entry type so there is nothing else to check. Note
     // that this style of checking will consider resolved/unresolved
     // class pairs and resolved/unresolved string pairs as different.
     // From the constantPoolOop API point of view, this is correct
     // behavior. See constantPoolKlass::merge() to see how this plays
     // out in the context of constantPoolOop merging.
     return false;
   }
   switch (t1) {
   case JVM_CONSTANT_Class:
   {
     klassOop k1 = klass_at(index1, CHECK_false);
     klassOop k2 = cp2->klass_at(index2, CHECK_false);
     if (k1 == k2) {
       return true;
     }
   } break;
   case JVM_CONSTANT_ClassIndex:
   {
     int recur1 = klass_index_at(index1);
     int recur2 = cp2->klass_index_at(index2);
     bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
     if (match) {
       return true;
     }
   } break;
   case JVM_CONSTANT_Double:
   {
     jdouble d1 = double_at(index1);
     jdouble d2 = cp2->double_at(index2);
     if (d1 == d2) {
       return true;
     }
   } break;
   case JVM_CONSTANT_Fieldref:
   case JVM_CONSTANT_InterfaceMethodref:
   case JVM_CONSTANT_Methodref:
   {
     int recur1 = uncached_klass_ref_index_at(index1);
     int recur2 = cp2->uncached_klass_ref_index_at(index2);
     bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
     if (match) {
       recur1 = uncached_name_and_type_ref_index_at(index1);
       recur2 = cp2->uncached_name_and_type_ref_index_at(index2);
       match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
       if (match) {
         return true;
       }
     }
   } break;
   case JVM_CONSTANT_Float:
   {
     jfloat f1 = float_at(index1);
     jfloat f2 = cp2->float_at(index2);
     if (f1 == f2) {
       return true;
     }
   } break;
   case JVM_CONSTANT_Integer:
   {
     jint i1 = int_at(index1);
     jint i2 = cp2->int_at(index2);
     if (i1 == i2) {
       return true;
     }
   } break;
   case JVM_CONSTANT_Long:
   {
     jlong l1 = long_at(index1);
     jlong l2 = cp2->long_at(index2);
     if (l1 == l2) {
       return true;
     }
   } break;
   case JVM_CONSTANT_NameAndType:
   {
     int recur1 = name_ref_index_at(index1);
     int recur2 = cp2->name_ref_index_at(index2);
     bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
     if (match) {
       recur1 = signature_ref_index_at(index1);
       recur2 = cp2->signature_ref_index_at(index2);
       match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
       if (match) {
         return true;
       }
     }
   } break;
   case JVM_CONSTANT_String:
   {
     oop s1 = string_at(index1, CHECK_false);
     oop s2 = cp2->string_at(index2, CHECK_false);
     if (s1 == s2) {
       return true;
     }
   } break;
   case JVM_CONSTANT_StringIndex:
   {
     int recur1 = string_index_at(index1);
     int recur2 = cp2->string_index_at(index2);
     bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
     if (match) {
       return true;
     }
   } break;
   case JVM_CONSTANT_UnresolvedClass:
   {
     symbolOop k1 = unresolved_klass_at(index1);
     symbolOop k2 = cp2->unresolved_klass_at(index2);
     if (k1 == k2) {
       return true;
     }
   } break;
   case JVM_CONSTANT_UnresolvedString:
   {
     symbolOop s1 = unresolved_string_at(index1);
     symbolOop s2 = cp2->unresolved_string_at(index2);
     if (s1 == s2) {
       return true;
     }
   } break;
   case JVM_CONSTANT_Utf8:
   {
     symbolOop s1 = symbol_at(index1);
     symbolOop s2 = cp2->symbol_at(index2);
     if (s1 == s2) {
       return true;
     }
   } break;
   // Invalid is used as the tag for the second constant pool entry
   // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
   // not be seen by itself.
   case JVM_CONSTANT_Invalid: // fall through
   default:
     ShouldNotReachHere();
     break;
   }
   return false;
 } // end compare_entry_to()
 // Copy this constant pool's entries at start_i to end_i (inclusive)
 // to the constant pool to_cp's entries starting at to_i. A total of
 // (end_i - start_i) + 1 entries are copied.
 void constantPoolOopDesc::copy_cp_to(int start_i, int end_i,
        constantPoolHandle to_cp, int to_i, TRAPS) {
   int dest_i = to_i;  // leave original alone for debug purposes
   for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) {
     copy_entry_to(src_i, to_cp, dest_i, CHECK);
     switch (tag_at(src_i).value()) {
     case JVM_CONSTANT_Double:
     case JVM_CONSTANT_Long:
       // double and long take two constant pool entries
       src_i += 2;
       dest_i += 2;
       break;
     default:
       // all others take one constant pool entry
       src_i++;
       dest_i++;
       break;
     }
   }
 } // end copy_cp_to()
 // Copy this constant pool's entry at from_i to the constant pool
 // to_cp's entry at to_i.
 void constantPoolOopDesc::copy_entry_to(int from_i, constantPoolHandle to_cp,
        int to_i, TRAPS) {
   switch (tag_at(from_i).value()) {
   case JVM_CONSTANT_Class:
   {
     klassOop k = klass_at(from_i, CHECK);
     to_cp->klass_at_put(to_i, k);
   } break;
   case JVM_CONSTANT_ClassIndex:
   {
     jint ki = klass_index_at(from_i);
     to_cp->klass_index_at_put(to_i, ki);
   } break;
   case JVM_CONSTANT_Double:
   {
     jdouble d = double_at(from_i);
     to_cp->double_at_put(to_i, d);
     // double takes two constant pool entries so init second entry's tag
     to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
   } break;
   case JVM_CONSTANT_Fieldref:
   {
     int class_index = uncached_klass_ref_index_at(from_i);
     int name_and_type_index = uncached_name_and_type_ref_index_at(from_i);
     to_cp->field_at_put(to_i, class_index, name_and_type_index);
   } break;
   case JVM_CONSTANT_Float:
   {
     jfloat f = float_at(from_i);
     to_cp->float_at_put(to_i, f);
   } break;
   case JVM_CONSTANT_Integer:
   {
     jint i = int_at(from_i);
     to_cp->int_at_put(to_i, i);
   } break;
   case JVM_CONSTANT_InterfaceMethodref:
   {
     int class_index = uncached_klass_ref_index_at(from_i);
     int name_and_type_index = uncached_name_and_type_ref_index_at(from_i);
     to_cp->interface_method_at_put(to_i, class_index, name_and_type_index);
   } break;
   case JVM_CONSTANT_Long:
   {
     jlong l = long_at(from_i);
     to_cp->long_at_put(to_i, l);
     // long takes two constant pool entries so init second entry's tag
     to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
   } break;
   case JVM_CONSTANT_Methodref:
   {
     int class_index = uncached_klass_ref_index_at(from_i);
     int name_and_type_index = uncached_name_and_type_ref_index_at(from_i);
     to_cp->method_at_put(to_i, class_index, name_and_type_index);
   } break;
   case JVM_CONSTANT_NameAndType:
   {
     int name_ref_index = name_ref_index_at(from_i);
     int signature_ref_index = signature_ref_index_at(from_i);
     to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index);
   } break;
   case JVM_CONSTANT_String:
   {
     oop s = string_at(from_i, CHECK);
     to_cp->string_at_put(to_i, s);
   } break;
   case JVM_CONSTANT_StringIndex:
   {
     jint si = string_index_at(from_i);
     to_cp->string_index_at_put(to_i, si);
   } break;
   case JVM_CONSTANT_UnresolvedClass:
   {
     symbolOop k = unresolved_klass_at(from_i);
     to_cp->unresolved_klass_at_put(to_i, k);
   } break;
   case JVM_CONSTANT_UnresolvedClassInError:
   {
     symbolOop k = unresolved_klass_at(from_i);
     to_cp->unresolved_klass_at_put(to_i, k);
     to_cp->tag_at_put(to_i, JVM_CONSTANT_UnresolvedClassInError);
   } break;
   case JVM_CONSTANT_UnresolvedString:
   {
     symbolOop s = unresolved_string_at(from_i);
     to_cp->unresolved_string_at_put(to_i, s);
   } break;
   case JVM_CONSTANT_Utf8:
   {
     symbolOop s = symbol_at(from_i);
     to_cp->symbol_at_put(to_i, s);
   } break;
   // Invalid is used as the tag for the second constant pool entry
   // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
   // not be seen by itself.
   case JVM_CONSTANT_Invalid: // fall through
   default:
   {
     jbyte bad_value = tag_at(from_i).value(); // leave a breadcrumb
     ShouldNotReachHere();
   } break;
   }
 } // end copy_entry_to()
 // Search constant pool search_cp for an entry that matches this
 // constant pool's entry at pattern_i. Returns the index of a
 // matching entry or zero (0) if there is no matching entry.
 int constantPoolOopDesc::find_matching_entry(int pattern_i,
       constantPoolHandle search_cp, TRAPS) {
   // index zero (0) is not used
   for (int i = 1; i < search_cp->length(); i++) {
     bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0);
     if (found) {
       return i;
     }
   }
   return 0;  // entry not found; return unused index zero (0)
 } // end find_matching_entry()
 #ifndef PRODUCT
 const char* constantPoolOopDesc::printable_name_at(int which) {
   constantTag tag = tag_at(which);
   if (tag.is_unresolved_string() || tag.is_string()) {
     return string_at_noresolve(which);
   } else if (tag.is_klass() || tag.is_unresolved_klass()) {
     return klass_name_at(which)->as_C_string();
   } else if (tag.is_symbol()) {
     return symbol_at(which)->as_C_string();
   }
   return "";
 }
 #endif // PRODUCT
 // JVMTI GetConstantPool support
 // For temporary use until code is stable.
 #define DBG(code)
 static const char* WARN_MSG = "Must not be such entry!";
 static void print_cpool_bytes(jint cnt, u1 *bytes) {
   jint size = 0;
   u2   idx1, idx2;
   for (jint idx = 1; idx < cnt; idx++) {
     jint ent_size = 0;
     u1   tag  = *bytes++;
     size++;                       // count tag
     printf("const #%03d, tag: %02d ", idx, tag);
     switch(tag) {
       case JVM_CONSTANT_Invalid: {
         printf("Invalid");
         break;
       }
       case JVM_CONSTANT_Unicode: {
         printf("Unicode      %s", WARN_MSG);
         break;
       }
       case JVM_CONSTANT_Utf8: {
         u2 len = Bytes::get_Java_u2(bytes);
         char str[128];
         if (len > 127) {
            len = 127;
         }
         strncpy(str, (char *) (bytes+2), len);
         str[len] = '\0';
         printf("Utf8          \"%s\"", str);
         ent_size = 2 + len;
         break;
       }
       case JVM_CONSTANT_Integer: {
         u4 val = Bytes::get_Java_u4(bytes);
         printf("int          %d", *(int *) &val);
         ent_size = 4;
         break;
       }
       case JVM_CONSTANT_Float: {
         u4 val = Bytes::get_Java_u4(bytes);
         printf("float        %5.3ff", *(float *) &val);
         ent_size = 4;
         break;
       }
       case JVM_CONSTANT_Long: {
         u8 val = Bytes::get_Java_u8(bytes);
         printf("long         "INT64_FORMAT, *(jlong *) &val);
         ent_size = 8;
         idx++; // Long takes two cpool slots
         break;
       }
       case JVM_CONSTANT_Double: {
         u8 val = Bytes::get_Java_u8(bytes);
         printf("double       %5.3fd", *(jdouble *)&val);
         ent_size = 8;
         idx++; // Double takes two cpool slots
         break;
       }
       case JVM_CONSTANT_Class: {
         idx1 = Bytes::get_Java_u2(bytes);
         printf("class        #%03d", idx1);
         ent_size = 2;
         break;
       }
       case JVM_CONSTANT_String: {
         idx1 = Bytes::get_Java_u2(bytes);
         printf("String       #%03d", idx1);
         ent_size = 2;
         break;
       }
       case JVM_CONSTANT_Fieldref: {
         idx1 = Bytes::get_Java_u2(bytes);
         idx2 = Bytes::get_Java_u2(bytes+2);
         printf("Field        #%03d, #%03d", (int) idx1, (int) idx2);
         ent_size = 4;
         break;
       }
       case JVM_CONSTANT_Methodref: {
         idx1 = Bytes::get_Java_u2(bytes);
         idx2 = Bytes::get_Java_u2(bytes+2);
         printf("Method       #%03d, #%03d", idx1, idx2);
         ent_size = 4;
         break;
       }
       case JVM_CONSTANT_InterfaceMethodref: {
         idx1 = Bytes::get_Java_u2(bytes);
         idx2 = Bytes::get_Java_u2(bytes+2);
         printf("InterfMethod #%03d, #%03d", idx1, idx2);
         ent_size = 4;
         break;
       }
       case JVM_CONSTANT_NameAndType: {
         idx1 = Bytes::get_Java_u2(bytes);
         idx2 = Bytes::get_Java_u2(bytes+2);
         printf("NameAndType  #%03d, #%03d", idx1, idx2);
         ent_size = 4;
         break;
       }
       case JVM_CONSTANT_ClassIndex: {
         printf("ClassIndex  %s", WARN_MSG);
         break;
       }
       case JVM_CONSTANT_UnresolvedClass: {
         printf("UnresolvedClass: %s", WARN_MSG);
         break;
       }
       case JVM_CONSTANT_UnresolvedClassInError: {
         printf("UnresolvedClassInErr: %s", WARN_MSG);
         break;
       }
       case JVM_CONSTANT_StringIndex: {
         printf("StringIndex: %s", WARN_MSG);
         break;
       }
       case JVM_CONSTANT_UnresolvedString: {
         printf("UnresolvedString: %s", WARN_MSG);
         break;
       }
     }
     printf(";\n");
     bytes += ent_size;
     size  += ent_size;
   }
   printf("Cpool size: %d\n", size);
   fflush(0);
   return;
 } /* end print_cpool_bytes */
 // Returns size of constant pool entry.
 jint constantPoolOopDesc::cpool_entry_size(jint idx) {
   switch(tag_at(idx).value()) {
     case JVM_CONSTANT_Invalid:
     case JVM_CONSTANT_Unicode:
       return 1;
     case JVM_CONSTANT_Utf8:
       return 3 + symbol_at(idx)->utf8_length();
     case JVM_CONSTANT_Class:
     case JVM_CONSTANT_String:
     case JVM_CONSTANT_ClassIndex:
     case JVM_CONSTANT_UnresolvedClass:
     case JVM_CONSTANT_UnresolvedClassInError:
     case JVM_CONSTANT_StringIndex:
     case JVM_CONSTANT_UnresolvedString:
       return 3;
     case JVM_CONSTANT_Integer:
     case JVM_CONSTANT_Float:
     case JVM_CONSTANT_Fieldref:
     case JVM_CONSTANT_Methodref:
     case JVM_CONSTANT_InterfaceMethodref:
     case JVM_CONSTANT_NameAndType:
       return 5;
     case JVM_CONSTANT_Long:
     case JVM_CONSTANT_Double:
       return 9;
   }
   assert(false, "cpool_entry_size: Invalid constant pool entry tag");
   return 1;
 } /* end cpool_entry_size */
 // SymbolHashMap is used to find a constant pool index from a string.
 // This function fills in SymbolHashMaps, one for utf8s and one for
 // class names, returns size of the cpool raw bytes.
 jint constantPoolOopDesc::hash_entries_to(SymbolHashMap *symmap,
                                           SymbolHashMap *classmap) {
   jint size = 0;
   for (u2 idx = 1; idx < length(); idx++) {
     u2 tag = tag_at(idx).value();
     size += cpool_entry_size(idx);
     switch(tag) {
       case JVM_CONSTANT_Utf8: {
         symbolOop sym = symbol_at(idx);
         symmap->add_entry(sym, idx);
         DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx));
         break;
       }
       case JVM_CONSTANT_Class:
       case JVM_CONSTANT_UnresolvedClass:
       case JVM_CONSTANT_UnresolvedClassInError: {
         symbolOop sym = klass_name_at(idx);
         classmap->add_entry(sym, idx);
         DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx));
         break;
       }
       case JVM_CONSTANT_Long:
       case JVM_CONSTANT_Double: {
         idx++; // Both Long and Double take two cpool slots
         break;
       }
     }
   }
   return size;
 } /* end hash_utf8_entries_to */
 // Copy cpool bytes.
 // Returns:
 //    0, in case of OutOfMemoryError
 //   -1, in case of internal error
 //  > 0, count of the raw cpool bytes that have been copied
 int constantPoolOopDesc::copy_cpool_bytes(int cpool_size,
                                           SymbolHashMap* tbl,
                                           unsigned char *bytes) {
   u2   idx1, idx2;
   jint size  = 0;
   jint cnt   = length();
   unsigned char *start_bytes = bytes;
   for (jint idx = 1; idx < cnt; idx++) {
     u1   tag      = tag_at(idx).value();
     jint ent_size = cpool_entry_size(idx);
     assert(size + ent_size <= cpool_size, "Size mismatch");
     *bytes = tag;
     DBG(printf("#%03hd tag=%03hd, ", idx, tag));
     switch(tag) {
       case JVM_CONSTANT_Invalid: {
         DBG(printf("JVM_CONSTANT_Invalid"));
         break;
       }
       case JVM_CONSTANT_Unicode: {
         assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode");
         DBG(printf("JVM_CONSTANT_Unicode"));
         break;
       }
       case JVM_CONSTANT_Utf8: {
         symbolOop sym = symbol_at(idx);
         char*     str = sym->as_utf8();
         // Warning! It's crashing on x86 with len = sym->utf8_length()
         int       len = (int) strlen(str);
         Bytes::put_Java_u2((address) (bytes+1), (u2) len);
         for (int i = 0; i < len; i++) {
             bytes[3+i] = (u1) str[i];
         }
         DBG(printf("JVM_CONSTANT_Utf8: %s ", str));
         break;
       }
       case JVM_CONSTANT_Integer: {
         jint val = int_at(idx);
         Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
         break;
       }
       case JVM_CONSTANT_Float: {
         jfloat val = float_at(idx);
         Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
         break;
       }
       case JVM_CONSTANT_Long: {
         jlong val = long_at(idx);
         Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
         idx++;             // Long takes two cpool slots
         break;
       }
       case JVM_CONSTANT_Double: {
         jdouble val = double_at(idx);
         Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
         idx++;             // Double takes two cpool slots
         break;
       }
       case JVM_CONSTANT_Class:
       case JVM_CONSTANT_UnresolvedClass:
       case JVM_CONSTANT_UnresolvedClassInError: {
         *bytes = JVM_CONSTANT_Class;
         symbolOop sym = klass_name_at(idx);
         idx1 = tbl->symbol_to_value(sym);
         assert(idx1 != 0, "Have not found a hashtable entry");
         Bytes::put_Java_u2((address) (bytes+1), idx1);
         DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8()));
         break;
       }
       case JVM_CONSTANT_String: {
         unsigned int hash;
         char *str = string_at_noresolve(idx);
         symbolOop sym = SymbolTable::lookup_only(str, (int) strlen(str), hash);
         if (sym == NULL) {
           // sym can be NULL if string refers to incorrectly encoded JVM_CONSTANT_Utf8
           // this can happen with JVM TI; see CR 6839599 for more details
           oop string = *(obj_at_addr(idx));
           assert(java_lang_String::is_instance(string),"Not a String");
           DBG(printf("Error #%03hd tag=%03hd\n", idx, tag));
           idx1 = 0;
           for (int j = 0; j < tbl->table_size() && idx1 == 0; j++) {
             for (SymbolHashMapEntry* cur = tbl->bucket(j); cur != NULL; cur = cur->next()) {
               int length;
               sym = cur->symbol();
               jchar* chars = sym->as_unicode(length);
               if (java_lang_String::equals(string, chars, length)) {
                 idx1 = cur->value();
                 DBG(printf("Index found: %d\n",idx1));
                 break;
               }
             }
           }
         } else {
           idx1 = tbl->symbol_to_value(sym);
         }
         assert(idx1 != 0, "Have not found a hashtable entry");
         Bytes::put_Java_u2((address) (bytes+1), idx1);
         DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, str));
         break;
       }
       case JVM_CONSTANT_UnresolvedString: {
         *bytes = JVM_CONSTANT_String;
         symbolOop sym = unresolved_string_at(idx);
         idx1 = tbl->symbol_to_value(sym);
         assert(idx1 != 0, "Have not found a hashtable entry");
         Bytes::put_Java_u2((address) (bytes+1), idx1);
         DBG(char *str = sym->as_utf8());
         DBG(printf("JVM_CONSTANT_UnresolvedString: idx=#%03hd, %s", idx1, str));
         break;
       }
       case JVM_CONSTANT_Fieldref:
       case JVM_CONSTANT_Methodref:
       case JVM_CONSTANT_InterfaceMethodref: {
         idx1 = uncached_klass_ref_index_at(idx);
         idx2 = uncached_name_and_type_ref_index_at(idx);
         Bytes::put_Java_u2((address) (bytes+1), idx1);
         Bytes::put_Java_u2((address) (bytes+3), idx2);
         DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2));
         break;
       }
       case JVM_CONSTANT_NameAndType: {
         idx1 = name_ref_index_at(idx);
         idx2 = signature_ref_index_at(idx);
         Bytes::put_Java_u2((address) (bytes+1), idx1);
         Bytes::put_Java_u2((address) (bytes+3), idx2);
         DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2));
         break;
       }
       case JVM_CONSTANT_ClassIndex: {
         *bytes = JVM_CONSTANT_Class;
         idx1 = klass_index_at(idx);
         Bytes::put_Java_u2((address) (bytes+1), idx1);
         DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1));
         break;
       }
       case JVM_CONSTANT_StringIndex: {
         *bytes = JVM_CONSTANT_String;
         idx1 = string_index_at(idx);
         Bytes::put_Java_u2((address) (bytes+1), idx1);
         DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1));
         break;
       }
     }
     DBG(printf("\n"));
     bytes += ent_size;
     size  += ent_size;
   }
   assert(size == cpool_size, "Size mismatch");
   // Keep temorarily for debugging until it's stable.
   DBG(print_cpool_bytes(cnt, start_bytes));
   return (int)(bytes - start_bytes);
 } /* end copy_cpool_bytes */
 void SymbolHashMap::add_entry(symbolOop sym, u2 value) {
   char *str = sym->as_utf8();
   unsigned int hash = compute_hash(str, sym->utf8_length());
   unsigned int index = hash % table_size();
   // check if already in map
   // we prefer the first entry since it is more likely to be what was used in
   // the class file
   for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
     assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
     if (en->hash() == hash && en->symbol() == sym) {
         return;  // already there
     }
   }
   SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value);
   entry->set_next(bucket(index));
   _buckets[index].set_entry(entry);
   assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
 }
 SymbolHashMapEntry* SymbolHashMap::find_entry(symbolOop sym) {
   assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL");
   char *str = sym->as_utf8();
   int   len = sym->utf8_length();
   unsigned int hash = SymbolHashMap::compute_hash(str, len);
   unsigned int index = hash % table_size();
   for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
     assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
     if (en->hash() == hash && en->symbol() == sym) {
       return en;
     }
   }
   return NULL;
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/oops/constantPoolOop.cpp@47ffceb239d0 (annotated)

src/share/vm/oops/constantPoolOop.cpp