duke@435: /*
xdono@1014:  * Copyright 1997-2009 Sun Microsystems, Inc.  All Rights Reserved.
duke@435:  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
duke@435:  *
duke@435:  * This code is free software; you can redistribute it and/or modify it
duke@435:  * under the terms of the GNU General Public License version 2 only, as
duke@435:  * published by the Free Software Foundation.
duke@435:  *
duke@435:  * This code is distributed in the hope that it will be useful, but WITHOUT
duke@435:  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
duke@435:  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
duke@435:  * version 2 for more details (a copy is included in the LICENSE file that
duke@435:  * accompanied this code).
duke@435:  *
duke@435:  * You should have received a copy of the GNU General Public License version
duke@435:  * 2 along with this work; if not, write to the Free Software Foundation,
duke@435:  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
duke@435:  *
duke@435:  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
duke@435:  * CA 95054 USA or visit www.sun.com if you need additional information or
duke@435:  * have any questions.
duke@435:  *
duke@435:  */
duke@435: 
duke@435: # include "incls/_precompiled.incl"
duke@435: # include "incls/_constantPoolOop.cpp.incl"
duke@435: 
jrose@866: void constantPoolOopDesc::set_flag_at(FlagBit fb) {
jrose@866:   const int MAX_STATE_CHANGES = 2;
jrose@866:   for (int i = MAX_STATE_CHANGES + 10; i > 0; i--) {
jrose@866:     int oflags = _flags;
jrose@866:     int nflags = oflags | (1 << (int)fb);
jrose@866:     if (Atomic::cmpxchg(nflags, &_flags, oflags) == oflags)
jrose@866:       return;
jrose@866:   }
jrose@866:   assert(false, "failed to cmpxchg flags");
jrose@866:   _flags |= (1 << (int)fb);     // better than nothing
jrose@866: }
jrose@866: 
duke@435: klassOop constantPoolOopDesc::klass_at_impl(constantPoolHandle this_oop, int which, TRAPS) {
duke@435:   // A resolved constantPool entry will contain a klassOop, otherwise a symbolOop.
duke@435:   // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and
duke@435:   // tag is not updated atomicly.
duke@435:   oop entry = *(this_oop->obj_at_addr(which));
duke@435:   if (entry->is_klass()) {
duke@435:     // Already resolved - return entry.
duke@435:     return (klassOop)entry;
duke@435:   }
duke@435: 
duke@435:   // Acquire lock on constant oop while doing update. After we get the lock, we check if another object
duke@435:   // already has updated the object
duke@435:   assert(THREAD->is_Java_thread(), "must be a Java thread");
duke@435:   bool do_resolve = false;
duke@435:   bool in_error = false;
duke@435: 
duke@435:   symbolHandle name;
duke@435:   Handle       loader;
duke@435:   { ObjectLocker ol(this_oop, THREAD);
duke@435: 
duke@435:     if (this_oop->tag_at(which).is_unresolved_klass()) {
duke@435:       if (this_oop->tag_at(which).is_unresolved_klass_in_error()) {
duke@435:         in_error = true;
duke@435:       } else {
duke@435:         do_resolve = true;
duke@435:         name   = symbolHandle(THREAD, this_oop->unresolved_klass_at(which));
duke@435:         loader = Handle(THREAD, instanceKlass::cast(this_oop->pool_holder())->class_loader());
duke@435:       }
duke@435:     }
duke@435:   } // unlocking constantPool
duke@435: 
duke@435: 
duke@435:   // The original attempt to resolve this constant pool entry failed so find the
duke@435:   // original error and throw it again (JVMS 5.4.3).
duke@435:   if (in_error) {
duke@435:     symbolOop error = SystemDictionary::find_resolution_error(this_oop, which);
duke@435:     guarantee(error != (symbolOop)NULL, "tag mismatch with resolution error table");
duke@435:     ResourceMark rm;
duke@435:     // exception text will be the class name
duke@435:     const char* className = this_oop->unresolved_klass_at(which)->as_C_string();
duke@435:     THROW_MSG_0(error, className);
duke@435:   }
duke@435: 
duke@435:   if (do_resolve) {
duke@435:     // this_oop must be unlocked during resolve_or_fail
duke@435:     oop protection_domain = Klass::cast(this_oop->pool_holder())->protection_domain();
duke@435:     Handle h_prot (THREAD, protection_domain);
duke@435:     klassOop k_oop = SystemDictionary::resolve_or_fail(name, loader, h_prot, true, THREAD);
duke@435:     KlassHandle k;
duke@435:     if (!HAS_PENDING_EXCEPTION) {
duke@435:       k = KlassHandle(THREAD, k_oop);
duke@435:       // Do access check for klasses
duke@435:       verify_constant_pool_resolve(this_oop, k, THREAD);
duke@435:     }
duke@435: 
duke@435:     // Failed to resolve class. We must record the errors so that subsequent attempts
duke@435:     // to resolve this constant pool entry fail with the same error (JVMS 5.4.3).
duke@435:     if (HAS_PENDING_EXCEPTION) {
duke@435:       ResourceMark rm;
duke@435:       symbolHandle error(PENDING_EXCEPTION->klass()->klass_part()->name());
duke@435: 
duke@435:       bool throw_orig_error = false;
duke@435:       {
duke@435:         ObjectLocker ol (this_oop, THREAD);
duke@435: 
duke@435:         // some other thread has beaten us and has resolved the class.
duke@435:         if (this_oop->tag_at(which).is_klass()) {
duke@435:           CLEAR_PENDING_EXCEPTION;
duke@435:           entry = this_oop->resolved_klass_at(which);
duke@435:           return (klassOop)entry;
duke@435:         }
duke@435: 
duke@435:         if (!PENDING_EXCEPTION->
duke@435:               is_a(SystemDictionary::linkageError_klass())) {
duke@435:           // Just throw the exception and don't prevent these classes from
duke@435:           // being loaded due to virtual machine errors like StackOverflow
duke@435:           // and OutOfMemoryError, etc, or if the thread was hit by stop()
duke@435:           // Needs clarification to section 5.4.3 of the VM spec (see 6308271)
duke@435:         }
duke@435:         else if (!this_oop->tag_at(which).is_unresolved_klass_in_error()) {
duke@435:           SystemDictionary::add_resolution_error(this_oop, which, error);
duke@435:           this_oop->tag_at_put(which, JVM_CONSTANT_UnresolvedClassInError);
duke@435:         } else {
duke@435:           // some other thread has put the class in error state.
duke@435:           error = symbolHandle(SystemDictionary::find_resolution_error(this_oop, which));
duke@435:           assert(!error.is_null(), "checking");
duke@435:           throw_orig_error = true;
duke@435:         }
duke@435:       } // unlocked
duke@435: 
duke@435:       if (throw_orig_error) {
duke@435:         CLEAR_PENDING_EXCEPTION;
duke@435:         ResourceMark rm;
duke@435:         const char* className = this_oop->unresolved_klass_at(which)->as_C_string();
duke@435:         THROW_MSG_0(error, className);
duke@435:       }
duke@435: 
duke@435:       return 0;
duke@435:     }
duke@435: 
duke@435:     if (TraceClassResolution && !k()->klass_part()->oop_is_array()) {
duke@435:       // skip resolving the constant pool so that this code get's
duke@435:       // called the next time some bytecodes refer to this class.
duke@435:       ResourceMark rm;
duke@435:       int line_number = -1;
duke@435:       const char * source_file = NULL;
duke@435:       if (JavaThread::current()->has_last_Java_frame()) {
duke@435:         // try to identify the method which called this function.
duke@435:         vframeStream vfst(JavaThread::current());
duke@435:         if (!vfst.at_end()) {
duke@435:           line_number = vfst.method()->line_number_from_bci(vfst.bci());
duke@435:           symbolOop s = instanceKlass::cast(vfst.method()->method_holder())->source_file_name();
duke@435:           if (s != NULL) {
duke@435:             source_file = s->as_C_string();
duke@435:           }
duke@435:         }
duke@435:       }
duke@435:       if (k() != this_oop->pool_holder()) {
duke@435:         // only print something if the classes are different
duke@435:         if (source_file != NULL) {
duke@435:           tty->print("RESOLVE %s %s %s:%d\n",
duke@435:                      instanceKlass::cast(this_oop->pool_holder())->external_name(),
duke@435:                      instanceKlass::cast(k())->external_name(), source_file, line_number);
duke@435:         } else {
duke@435:           tty->print("RESOLVE %s %s\n",
duke@435:                      instanceKlass::cast(this_oop->pool_holder())->external_name(),
duke@435:                      instanceKlass::cast(k())->external_name());
duke@435:         }
duke@435:       }
duke@435:       return k();
duke@435:     } else {
duke@435:       ObjectLocker ol (this_oop, THREAD);
duke@435:       // Only updated constant pool - if it is resolved.
duke@435:       do_resolve = this_oop->tag_at(which).is_unresolved_klass();
duke@435:       if (do_resolve) {
duke@435:         this_oop->klass_at_put(which, k());
duke@435:       }
duke@435:     }
duke@435:   }
duke@435: 
duke@435:   entry = this_oop->resolved_klass_at(which);
duke@435:   assert(entry->is_klass(), "must be resolved at this point");
duke@435:   return (klassOop)entry;
duke@435: }
duke@435: 
duke@435: 
duke@435: // Does not update constantPoolOop - to avoid any exception throwing. Used
duke@435: // by compiler and exception handling.  Also used to avoid classloads for
duke@435: // instanceof operations. Returns NULL if the class has not been loaded or
duke@435: // if the verification of constant pool failed
duke@435: klassOop constantPoolOopDesc::klass_at_if_loaded(constantPoolHandle this_oop, int which) {
duke@435:   oop entry = *this_oop->obj_at_addr(which);
duke@435:   if (entry->is_klass()) {
duke@435:     return (klassOop)entry;
duke@435:   } else {
duke@435:     assert(entry->is_symbol(), "must be either symbol or klass");
duke@435:     Thread *thread = Thread::current();
duke@435:     symbolHandle name (thread, (symbolOop)entry);
duke@435:     oop loader = instanceKlass::cast(this_oop->pool_holder())->class_loader();
duke@435:     oop protection_domain = Klass::cast(this_oop->pool_holder())->protection_domain();
duke@435:     Handle h_prot (thread, protection_domain);
duke@435:     Handle h_loader (thread, loader);
duke@435:     klassOop k = SystemDictionary::find(name, h_loader, h_prot, thread);
duke@435: 
duke@435:     if (k != NULL) {
duke@435:       // Make sure that resolving is legal
duke@435:       EXCEPTION_MARK;
duke@435:       KlassHandle klass(THREAD, k);
duke@435:       // return NULL if verification fails
duke@435:       verify_constant_pool_resolve(this_oop, klass, THREAD);
duke@435:       if (HAS_PENDING_EXCEPTION) {
duke@435:         CLEAR_PENDING_EXCEPTION;
duke@435:         return NULL;
duke@435:       }
duke@435:       return klass();
duke@435:     } else {
duke@435:       return k;
duke@435:     }
duke@435:   }
duke@435: }
duke@435: 
duke@435: 
duke@435: klassOop constantPoolOopDesc::klass_ref_at_if_loaded(constantPoolHandle this_oop, int which) {
duke@435:   return klass_at_if_loaded(this_oop, this_oop->klass_ref_index_at(which));
duke@435: }
duke@435: 
duke@435: 
duke@435: // This is an interface for the compiler that allows accessing non-resolved entries
duke@435: // in the constant pool - but still performs the validations tests. Must be used
duke@435: // in a pre-parse of the compiler - to determine what it can do and not do.
duke@435: // Note: We cannot update the ConstantPool from the vm_thread.
duke@435: klassOop constantPoolOopDesc::klass_ref_at_if_loaded_check(constantPoolHandle this_oop, int index, TRAPS) {
duke@435:   int which = this_oop->klass_ref_index_at(index);
duke@435:   oop entry = *this_oop->obj_at_addr(which);
duke@435:   if (entry->is_klass()) {
duke@435:     return (klassOop)entry;
duke@435:   } else {
duke@435:     assert(entry->is_symbol(), "must be either symbol or klass");
duke@435:     symbolHandle name (THREAD, (symbolOop)entry);
duke@435:     oop loader = instanceKlass::cast(this_oop->pool_holder())->class_loader();
duke@435:     oop protection_domain = Klass::cast(this_oop->pool_holder())->protection_domain();
duke@435:     Handle h_loader(THREAD, loader);
duke@435:     Handle h_prot  (THREAD, protection_domain);
duke@435:     KlassHandle k(THREAD, SystemDictionary::find(name, h_loader, h_prot, THREAD));
duke@435: 
duke@435:     // Do access check for klasses
duke@435:     if( k.not_null() ) verify_constant_pool_resolve(this_oop, k, CHECK_NULL);
duke@435:     return k();
duke@435:   }
duke@435: }
duke@435: 
duke@435: 
jrose@1161: symbolOop constantPoolOopDesc::impl_name_ref_at(int which, bool uncached) {
jrose@1161:   int name_index = name_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
duke@435:   return symbol_at(name_index);
duke@435: }
duke@435: 
duke@435: 
jrose@1161: symbolOop constantPoolOopDesc::impl_signature_ref_at(int which, bool uncached) {
jrose@1161:   int signature_index = signature_ref_index_at(impl_name_and_type_ref_index_at(which, uncached));
duke@435:   return symbol_at(signature_index);
duke@435: }
duke@435: 
duke@435: 
jrose@1161: int constantPoolOopDesc::impl_name_and_type_ref_index_at(int which, bool uncached) {
jrose@1494:   int i = which;
jrose@1494:   if (!uncached && cache() != NULL) {
jrose@1494:     if (constantPoolCacheOopDesc::is_secondary_index(which))
jrose@1494:       // Invokedynamic indexes are always processed in native order
jrose@1494:       // so there is no question of reading a native u2 in Java order here.
jrose@1494:       return cache()->main_entry_at(which)->constant_pool_index();
jrose@1494:     // change byte-ordering and go via cache
jrose@1494:     i = remap_instruction_operand_from_cache(which);
jrose@1494:   } else {
jrose@1494:     if (tag_at(which).is_name_and_type())
jrose@1494:       // invokedynamic index is a simple name-and-type
jrose@1494:       return which;
jrose@1494:   }
jrose@1494:   assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
jrose@1494:   jint ref_index = *int_at_addr(i);
duke@435:   return extract_high_short_from_int(ref_index);
duke@435: }
duke@435: 
duke@435: 
jrose@1161: int constantPoolOopDesc::impl_klass_ref_index_at(int which, bool uncached) {
jrose@1494:   guarantee(!constantPoolCacheOopDesc::is_secondary_index(which),
jrose@1494:             "an invokedynamic instruction does not have a klass");
jrose@1494:   int i = which;
jrose@1494:   if (!uncached && cache() != NULL) {
jrose@1494:     // change byte-ordering and go via cache
jrose@1494:     i = remap_instruction_operand_from_cache(which);
jrose@1494:   }
jrose@1494:   assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
jrose@1494:   jint ref_index = *int_at_addr(i);
duke@435:   return extract_low_short_from_int(ref_index);
duke@435: }
duke@435: 
duke@435: 
jrose@1161: 
jrose@1494: int constantPoolOopDesc::remap_instruction_operand_from_cache(int operand) {
jrose@1494:   // Operand was fetched by a stream using get_Java_u2, yet was stored
jrose@1494:   // by Rewriter::rewrite_member_reference in native order.
jrose@1494:   // So now we have to fix the damage by swapping back to native order.
jrose@1161:   assert((int)(u2)operand == operand, "clean u2");
jrose@1494:   int cpc_index = Bytes::swap_u2(operand);
jrose@1494:   int member_index = cache()->entry_at(cpc_index)->constant_pool_index();
jrose@1494:   return member_index;
jrose@1161: }
jrose@1161: 
jrose@1161: 
duke@435: void constantPoolOopDesc::verify_constant_pool_resolve(constantPoolHandle this_oop, KlassHandle k, TRAPS) {
duke@435:  if (k->oop_is_instance() || k->oop_is_objArray()) {
duke@435:     instanceKlassHandle holder (THREAD, this_oop->pool_holder());
duke@435:     klassOop elem_oop = k->oop_is_instance() ? k() : objArrayKlass::cast(k())->bottom_klass();
duke@435:     KlassHandle element (THREAD, elem_oop);
duke@435: 
duke@435:     // The element type could be a typeArray - we only need the access check if it is
duke@435:     // an reference to another class
duke@435:     if (element->oop_is_instance()) {
duke@435:       LinkResolver::check_klass_accessability(holder, element, CHECK);
duke@435:     }
duke@435:   }
duke@435: }
duke@435: 
duke@435: 
jrose@1161: int constantPoolOopDesc::name_ref_index_at(int which_nt) {
jrose@1161:   jint ref_index = name_and_type_at(which_nt);
duke@435:   return extract_low_short_from_int(ref_index);
duke@435: }
duke@435: 
duke@435: 
jrose@1161: int constantPoolOopDesc::signature_ref_index_at(int which_nt) {
jrose@1161:   jint ref_index = name_and_type_at(which_nt);
duke@435:   return extract_high_short_from_int(ref_index);
duke@435: }
duke@435: 
duke@435: 
duke@435: klassOop constantPoolOopDesc::klass_ref_at(int which, TRAPS) {
duke@435:   return klass_at(klass_ref_index_at(which), CHECK_NULL);
duke@435: }
duke@435: 
duke@435: 
duke@435: symbolOop constantPoolOopDesc::klass_name_at(int which) {
duke@435:   assert(tag_at(which).is_unresolved_klass() || tag_at(which).is_klass(),
duke@435:          "Corrupted constant pool");
duke@435:   // A resolved constantPool entry will contain a klassOop, otherwise a symbolOop.
duke@435:   // It is not safe to rely on the tag bit's here, since we don't have a lock, and the entry and
duke@435:   // tag is not updated atomicly.
duke@435:   oop entry = *(obj_at_addr(which));
duke@435:   if (entry->is_klass()) {
duke@435:     // Already resolved - return entry's name.
duke@435:     return klassOop(entry)->klass_part()->name();
duke@435:   } else {
duke@435:     assert(entry->is_symbol(), "must be either symbol or klass");
duke@435:     return (symbolOop)entry;
duke@435:   }
duke@435: }
duke@435: 
duke@435: symbolOop constantPoolOopDesc::klass_ref_at_noresolve(int which) {
duke@435:   jint ref_index = klass_ref_index_at(which);
duke@435:   return klass_at_noresolve(ref_index);
duke@435: }
duke@435: 
duke@435: char* constantPoolOopDesc::string_at_noresolve(int which) {
duke@435:   // Test entry type in case string is resolved while in here.
duke@435:   oop entry = *(obj_at_addr(which));
duke@435:   if (entry->is_symbol()) {
duke@435:     return ((symbolOop)entry)->as_C_string();
jrose@866:   } else if (java_lang_String::is_instance(entry)) {
jrose@866:     return java_lang_String::as_utf8_string(entry);
duke@435:   } else {
jrose@866:     return (char*)"<pseudo-string>";
duke@435:   }
duke@435: }
duke@435: 
duke@435: 
duke@435: BasicType constantPoolOopDesc::basic_type_for_signature_at(int which) {
duke@435:   return FieldType::basic_type(symbol_at(which));
duke@435: }
duke@435: 
duke@435: 
duke@435: void constantPoolOopDesc::resolve_string_constants_impl(constantPoolHandle this_oop, TRAPS) {
duke@435:   for (int index = 1; index < this_oop->length(); index++) { // Index 0 is unused
duke@435:     if (this_oop->tag_at(index).is_unresolved_string()) {
duke@435:       this_oop->string_at(index, CHECK);
duke@435:     }
duke@435:   }
duke@435: }
duke@435: 
duke@435: oop constantPoolOopDesc::string_at_impl(constantPoolHandle this_oop, int which, TRAPS) {
duke@435:   oop entry = *(this_oop->obj_at_addr(which));
duke@435:   if (entry->is_symbol()) {
duke@435:     ObjectLocker ol(this_oop, THREAD);
duke@435:     if (this_oop->tag_at(which).is_unresolved_string()) {
duke@435:       // Intern string
duke@435:       symbolOop sym = this_oop->unresolved_string_at(which);
duke@435:       entry = StringTable::intern(sym, CHECK_(constantPoolOop(NULL)));
duke@435:       this_oop->string_at_put(which, entry);
duke@435:     } else {
duke@435:       // Another thread beat us and interned string, read string from constant pool
duke@435:       entry = this_oop->resolved_string_at(which);
duke@435:     }
duke@435:   }
duke@435:   assert(java_lang_String::is_instance(entry), "must be string");
duke@435:   return entry;
duke@435: }
duke@435: 
duke@435: 
jrose@866: bool constantPoolOopDesc::is_pseudo_string_at(int which) {
jrose@866:   oop entry = *(obj_at_addr(which));
jrose@866:   if (entry->is_symbol())
jrose@866:     // Not yet resolved, but it will resolve to a string.
jrose@866:     return false;
jrose@866:   else if (java_lang_String::is_instance(entry))
jrose@866:     return false; // actually, it might be a non-interned or non-perm string
jrose@866:   else
jrose@866:     // truly pseudo
jrose@866:     return true;
jrose@866: }
jrose@866: 
jrose@866: 
duke@435: bool constantPoolOopDesc::klass_name_at_matches(instanceKlassHandle k,
duke@435:                                                 int which) {
duke@435:   // Names are interned, so we can compare symbolOops directly
duke@435:   symbolOop cp_name = klass_name_at(which);
duke@435:   return (cp_name == k->name());
duke@435: }
duke@435: 
duke@435: 
duke@435: int constantPoolOopDesc::pre_resolve_shared_klasses(TRAPS) {
duke@435:   ResourceMark rm;
duke@435:   int count = 0;
duke@435:   for (int index = 1; index < tags()->length(); index++) { // Index 0 is unused
duke@435:     if (tag_at(index).is_unresolved_string()) {
duke@435:       // Intern string
duke@435:       symbolOop sym = unresolved_string_at(index);
duke@435:       oop entry = StringTable::intern(sym, CHECK_(-1));
duke@435:       string_at_put(index, entry);
duke@435:     }
duke@435:   }
duke@435:   return count;
duke@435: }
duke@435: 
duke@435: 
duke@435: // Iterate over symbols which are used as class, field, method names and
duke@435: // signatures (in preparation for writing to the shared archive).
duke@435: 
duke@435: void constantPoolOopDesc::shared_symbols_iterate(OopClosure* closure) {
duke@435:   for (int index = 1; index < length(); index++) { // Index 0 is unused
duke@435:     switch (tag_at(index).value()) {
duke@435: 
duke@435:     case JVM_CONSTANT_UnresolvedClass:
duke@435:       closure->do_oop(obj_at_addr(index));
duke@435:       break;
duke@435: 
duke@435:     case JVM_CONSTANT_NameAndType:
duke@435:       {
duke@435:         int i = *int_at_addr(index);
duke@435:         closure->do_oop(obj_at_addr((unsigned)i >> 16));
duke@435:         closure->do_oop(obj_at_addr((unsigned)i & 0xffff));
duke@435:       }
duke@435:       break;
duke@435: 
duke@435:     case JVM_CONSTANT_Class:
duke@435:     case JVM_CONSTANT_InterfaceMethodref:
duke@435:     case JVM_CONSTANT_Fieldref:
duke@435:     case JVM_CONSTANT_Methodref:
duke@435:     case JVM_CONSTANT_Integer:
duke@435:     case JVM_CONSTANT_Float:
duke@435:       // Do nothing!  Not an oop.
duke@435:       // These constant types do not reference symbols at this point.
duke@435:       break;
duke@435: 
duke@435:     case JVM_CONSTANT_String:
duke@435:       // Do nothing!  Not a symbol.
duke@435:       break;
duke@435: 
duke@435:     case JVM_CONSTANT_UnresolvedString:
duke@435:     case JVM_CONSTANT_Utf8:
duke@435:       // These constants are symbols, but unless these symbols are
duke@435:       // actually to be used for something, we don't want to mark them.
duke@435:       break;
duke@435: 
duke@435:     case JVM_CONSTANT_Long:
duke@435:     case JVM_CONSTANT_Double:
duke@435:       // Do nothing!  Not an oop. (But takes two pool entries.)
duke@435:       ++index;
duke@435:       break;
duke@435: 
duke@435:     default:
duke@435:       ShouldNotReachHere();
duke@435:       break;
duke@435:     }
duke@435:   }
duke@435: }
duke@435: 
duke@435: 
duke@435: // Iterate over the [one] tags array (in preparation for writing to the
duke@435: // shared archive).
duke@435: 
duke@435: void constantPoolOopDesc::shared_tags_iterate(OopClosure* closure) {
duke@435:   closure->do_oop(tags_addr());
duke@435: }
duke@435: 
duke@435: 
duke@435: // Iterate over String objects (in preparation for writing to the shared
duke@435: // archive).
duke@435: 
duke@435: void constantPoolOopDesc::shared_strings_iterate(OopClosure* closure) {
duke@435:   for (int index = 1; index < length(); index++) { // Index 0 is unused
duke@435:     switch (tag_at(index).value()) {
duke@435: 
duke@435:     case JVM_CONSTANT_UnresolvedClass:
duke@435:     case JVM_CONSTANT_NameAndType:
duke@435:       // Do nothing!  Not a String.
duke@435:       break;
duke@435: 
duke@435:     case JVM_CONSTANT_Class:
duke@435:     case JVM_CONSTANT_InterfaceMethodref:
duke@435:     case JVM_CONSTANT_Fieldref:
duke@435:     case JVM_CONSTANT_Methodref:
duke@435:     case JVM_CONSTANT_Integer:
duke@435:     case JVM_CONSTANT_Float:
duke@435:       // Do nothing!  Not an oop.
duke@435:       // These constant types do not reference symbols at this point.
duke@435:       break;
duke@435: 
duke@435:     case JVM_CONSTANT_String:
duke@435:       closure->do_oop(obj_at_addr(index));
duke@435:       break;
duke@435: 
duke@435:     case JVM_CONSTANT_UnresolvedString:
duke@435:     case JVM_CONSTANT_Utf8:
duke@435:       // These constants are symbols, but unless these symbols are
duke@435:       // actually to be used for something, we don't want to mark them.
duke@435:       break;
duke@435: 
duke@435:     case JVM_CONSTANT_Long:
duke@435:     case JVM_CONSTANT_Double:
duke@435:       // Do nothing!  Not an oop. (But takes two pool entries.)
duke@435:       ++index;
duke@435:       break;
duke@435: 
duke@435:     default:
duke@435:       ShouldNotReachHere();
duke@435:       break;
duke@435:     }
duke@435:   }
duke@435: }
duke@435: 
duke@435: 
duke@435: // Compare this constant pool's entry at index1 to the constant pool
duke@435: // cp2's entry at index2.
duke@435: bool constantPoolOopDesc::compare_entry_to(int index1, constantPoolHandle cp2,
duke@435:        int index2, TRAPS) {
duke@435: 
duke@435:   jbyte t1 = tag_at(index1).value();
duke@435:   jbyte t2 = cp2->tag_at(index2).value();
duke@435: 
duke@435: 
duke@435:   // JVM_CONSTANT_UnresolvedClassInError is equal to JVM_CONSTANT_UnresolvedClass
duke@435:   // when comparing
duke@435:   if (t1 == JVM_CONSTANT_UnresolvedClassInError) {
duke@435:     t1 = JVM_CONSTANT_UnresolvedClass;
duke@435:   }
duke@435:   if (t2 == JVM_CONSTANT_UnresolvedClassInError) {
duke@435:     t2 = JVM_CONSTANT_UnresolvedClass;
duke@435:   }
duke@435: 
duke@435:   if (t1 != t2) {
duke@435:     // Not the same entry type so there is nothing else to check. Note
duke@435:     // that this style of checking will consider resolved/unresolved
duke@435:     // class pairs and resolved/unresolved string pairs as different.
duke@435:     // From the constantPoolOop API point of view, this is correct
duke@435:     // behavior. See constantPoolKlass::merge() to see how this plays
duke@435:     // out in the context of constantPoolOop merging.
duke@435:     return false;
duke@435:   }
duke@435: 
duke@435:   switch (t1) {
duke@435:   case JVM_CONSTANT_Class:
duke@435:   {
duke@435:     klassOop k1 = klass_at(index1, CHECK_false);
duke@435:     klassOop k2 = cp2->klass_at(index2, CHECK_false);
duke@435:     if (k1 == k2) {
duke@435:       return true;
duke@435:     }
duke@435:   } break;
duke@435: 
duke@435:   case JVM_CONSTANT_ClassIndex:
duke@435:   {
duke@435:     int recur1 = klass_index_at(index1);
duke@435:     int recur2 = cp2->klass_index_at(index2);
duke@435:     bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
duke@435:     if (match) {
duke@435:       return true;
duke@435:     }
duke@435:   } break;
duke@435: 
duke@435:   case JVM_CONSTANT_Double:
duke@435:   {
duke@435:     jdouble d1 = double_at(index1);
duke@435:     jdouble d2 = cp2->double_at(index2);
duke@435:     if (d1 == d2) {
duke@435:       return true;
duke@435:     }
duke@435:   } break;
duke@435: 
duke@435:   case JVM_CONSTANT_Fieldref:
duke@435:   case JVM_CONSTANT_InterfaceMethodref:
duke@435:   case JVM_CONSTANT_Methodref:
duke@435:   {
duke@435:     int recur1 = uncached_klass_ref_index_at(index1);
duke@435:     int recur2 = cp2->uncached_klass_ref_index_at(index2);
duke@435:     bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
duke@435:     if (match) {
duke@435:       recur1 = uncached_name_and_type_ref_index_at(index1);
duke@435:       recur2 = cp2->uncached_name_and_type_ref_index_at(index2);
duke@435:       match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
duke@435:       if (match) {
duke@435:         return true;
duke@435:       }
duke@435:     }
duke@435:   } break;
duke@435: 
duke@435:   case JVM_CONSTANT_Float:
duke@435:   {
duke@435:     jfloat f1 = float_at(index1);
duke@435:     jfloat f2 = cp2->float_at(index2);
duke@435:     if (f1 == f2) {
duke@435:       return true;
duke@435:     }
duke@435:   } break;
duke@435: 
duke@435:   case JVM_CONSTANT_Integer:
duke@435:   {
duke@435:     jint i1 = int_at(index1);
duke@435:     jint i2 = cp2->int_at(index2);
duke@435:     if (i1 == i2) {
duke@435:       return true;
duke@435:     }
duke@435:   } break;
duke@435: 
duke@435:   case JVM_CONSTANT_Long:
duke@435:   {
duke@435:     jlong l1 = long_at(index1);
duke@435:     jlong l2 = cp2->long_at(index2);
duke@435:     if (l1 == l2) {
duke@435:       return true;
duke@435:     }
duke@435:   } break;
duke@435: 
duke@435:   case JVM_CONSTANT_NameAndType:
duke@435:   {
duke@435:     int recur1 = name_ref_index_at(index1);
duke@435:     int recur2 = cp2->name_ref_index_at(index2);
duke@435:     bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
duke@435:     if (match) {
duke@435:       recur1 = signature_ref_index_at(index1);
duke@435:       recur2 = cp2->signature_ref_index_at(index2);
duke@435:       match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
duke@435:       if (match) {
duke@435:         return true;
duke@435:       }
duke@435:     }
duke@435:   } break;
duke@435: 
duke@435:   case JVM_CONSTANT_String:
duke@435:   {
duke@435:     oop s1 = string_at(index1, CHECK_false);
duke@435:     oop s2 = cp2->string_at(index2, CHECK_false);
duke@435:     if (s1 == s2) {
duke@435:       return true;
duke@435:     }
duke@435:   } break;
duke@435: 
duke@435:   case JVM_CONSTANT_StringIndex:
duke@435:   {
duke@435:     int recur1 = string_index_at(index1);
duke@435:     int recur2 = cp2->string_index_at(index2);
duke@435:     bool match = compare_entry_to(recur1, cp2, recur2, CHECK_false);
duke@435:     if (match) {
duke@435:       return true;
duke@435:     }
duke@435:   } break;
duke@435: 
duke@435:   case JVM_CONSTANT_UnresolvedClass:
duke@435:   {
duke@435:     symbolOop k1 = unresolved_klass_at(index1);
duke@435:     symbolOop k2 = cp2->unresolved_klass_at(index2);
duke@435:     if (k1 == k2) {
duke@435:       return true;
duke@435:     }
duke@435:   } break;
duke@435: 
duke@435:   case JVM_CONSTANT_UnresolvedString:
duke@435:   {
duke@435:     symbolOop s1 = unresolved_string_at(index1);
duke@435:     symbolOop s2 = cp2->unresolved_string_at(index2);
duke@435:     if (s1 == s2) {
duke@435:       return true;
duke@435:     }
duke@435:   } break;
duke@435: 
duke@435:   case JVM_CONSTANT_Utf8:
duke@435:   {
duke@435:     symbolOop s1 = symbol_at(index1);
duke@435:     symbolOop s2 = cp2->symbol_at(index2);
duke@435:     if (s1 == s2) {
duke@435:       return true;
duke@435:     }
duke@435:   } break;
duke@435: 
duke@435:   // Invalid is used as the tag for the second constant pool entry
duke@435:   // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
duke@435:   // not be seen by itself.
duke@435:   case JVM_CONSTANT_Invalid: // fall through
duke@435: 
duke@435:   default:
duke@435:     ShouldNotReachHere();
duke@435:     break;
duke@435:   }
duke@435: 
duke@435:   return false;
duke@435: } // end compare_entry_to()
duke@435: 
duke@435: 
duke@435: // Copy this constant pool's entries at start_i to end_i (inclusive)
duke@435: // to the constant pool to_cp's entries starting at to_i. A total of
duke@435: // (end_i - start_i) + 1 entries are copied.
duke@435: void constantPoolOopDesc::copy_cp_to(int start_i, int end_i,
duke@435:        constantPoolHandle to_cp, int to_i, TRAPS) {
duke@435: 
duke@435:   int dest_i = to_i;  // leave original alone for debug purposes
duke@435: 
duke@435:   for (int src_i = start_i; src_i <= end_i; /* see loop bottom */ ) {
duke@435:     copy_entry_to(src_i, to_cp, dest_i, CHECK);
duke@435: 
duke@435:     switch (tag_at(src_i).value()) {
duke@435:     case JVM_CONSTANT_Double:
duke@435:     case JVM_CONSTANT_Long:
duke@435:       // double and long take two constant pool entries
duke@435:       src_i += 2;
duke@435:       dest_i += 2;
duke@435:       break;
duke@435: 
duke@435:     default:
duke@435:       // all others take one constant pool entry
duke@435:       src_i++;
duke@435:       dest_i++;
duke@435:       break;
duke@435:     }
duke@435:   }
duke@435: } // end copy_cp_to()
duke@435: 
duke@435: 
duke@435: // Copy this constant pool's entry at from_i to the constant pool
duke@435: // to_cp's entry at to_i.
duke@435: void constantPoolOopDesc::copy_entry_to(int from_i, constantPoolHandle to_cp,
duke@435:        int to_i, TRAPS) {
duke@435: 
duke@435:   switch (tag_at(from_i).value()) {
duke@435:   case JVM_CONSTANT_Class:
duke@435:   {
duke@435:     klassOop k = klass_at(from_i, CHECK);
duke@435:     to_cp->klass_at_put(to_i, k);
duke@435:   } break;
duke@435: 
duke@435:   case JVM_CONSTANT_ClassIndex:
duke@435:   {
duke@435:     jint ki = klass_index_at(from_i);
duke@435:     to_cp->klass_index_at_put(to_i, ki);
duke@435:   } break;
duke@435: 
duke@435:   case JVM_CONSTANT_Double:
duke@435:   {
duke@435:     jdouble d = double_at(from_i);
duke@435:     to_cp->double_at_put(to_i, d);
duke@435:     // double takes two constant pool entries so init second entry's tag
duke@435:     to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
duke@435:   } break;
duke@435: 
duke@435:   case JVM_CONSTANT_Fieldref:
duke@435:   {
duke@435:     int class_index = uncached_klass_ref_index_at(from_i);
duke@435:     int name_and_type_index = uncached_name_and_type_ref_index_at(from_i);
duke@435:     to_cp->field_at_put(to_i, class_index, name_and_type_index);
duke@435:   } break;
duke@435: 
duke@435:   case JVM_CONSTANT_Float:
duke@435:   {
duke@435:     jfloat f = float_at(from_i);
duke@435:     to_cp->float_at_put(to_i, f);
duke@435:   } break;
duke@435: 
duke@435:   case JVM_CONSTANT_Integer:
duke@435:   {
duke@435:     jint i = int_at(from_i);
duke@435:     to_cp->int_at_put(to_i, i);
duke@435:   } break;
duke@435: 
duke@435:   case JVM_CONSTANT_InterfaceMethodref:
duke@435:   {
duke@435:     int class_index = uncached_klass_ref_index_at(from_i);
duke@435:     int name_and_type_index = uncached_name_and_type_ref_index_at(from_i);
duke@435:     to_cp->interface_method_at_put(to_i, class_index, name_and_type_index);
duke@435:   } break;
duke@435: 
duke@435:   case JVM_CONSTANT_Long:
duke@435:   {
duke@435:     jlong l = long_at(from_i);
duke@435:     to_cp->long_at_put(to_i, l);
duke@435:     // long takes two constant pool entries so init second entry's tag
duke@435:     to_cp->tag_at_put(to_i + 1, JVM_CONSTANT_Invalid);
duke@435:   } break;
duke@435: 
duke@435:   case JVM_CONSTANT_Methodref:
duke@435:   {
duke@435:     int class_index = uncached_klass_ref_index_at(from_i);
duke@435:     int name_and_type_index = uncached_name_and_type_ref_index_at(from_i);
duke@435:     to_cp->method_at_put(to_i, class_index, name_and_type_index);
duke@435:   } break;
duke@435: 
duke@435:   case JVM_CONSTANT_NameAndType:
duke@435:   {
duke@435:     int name_ref_index = name_ref_index_at(from_i);
duke@435:     int signature_ref_index = signature_ref_index_at(from_i);
duke@435:     to_cp->name_and_type_at_put(to_i, name_ref_index, signature_ref_index);
duke@435:   } break;
duke@435: 
duke@435:   case JVM_CONSTANT_String:
duke@435:   {
duke@435:     oop s = string_at(from_i, CHECK);
duke@435:     to_cp->string_at_put(to_i, s);
duke@435:   } break;
duke@435: 
duke@435:   case JVM_CONSTANT_StringIndex:
duke@435:   {
duke@435:     jint si = string_index_at(from_i);
duke@435:     to_cp->string_index_at_put(to_i, si);
duke@435:   } break;
duke@435: 
duke@435:   case JVM_CONSTANT_UnresolvedClass:
duke@435:   {
duke@435:     symbolOop k = unresolved_klass_at(from_i);
duke@435:     to_cp->unresolved_klass_at_put(to_i, k);
duke@435:   } break;
duke@435: 
duke@435:   case JVM_CONSTANT_UnresolvedClassInError:
duke@435:   {
duke@435:     symbolOop k = unresolved_klass_at(from_i);
duke@435:     to_cp->unresolved_klass_at_put(to_i, k);
duke@435:     to_cp->tag_at_put(to_i, JVM_CONSTANT_UnresolvedClassInError);
duke@435:   } break;
duke@435: 
duke@435: 
duke@435:   case JVM_CONSTANT_UnresolvedString:
duke@435:   {
duke@435:     symbolOop s = unresolved_string_at(from_i);
duke@435:     to_cp->unresolved_string_at_put(to_i, s);
duke@435:   } break;
duke@435: 
duke@435:   case JVM_CONSTANT_Utf8:
duke@435:   {
duke@435:     symbolOop s = symbol_at(from_i);
duke@435:     to_cp->symbol_at_put(to_i, s);
duke@435:   } break;
duke@435: 
duke@435:   // Invalid is used as the tag for the second constant pool entry
duke@435:   // occupied by JVM_CONSTANT_Double or JVM_CONSTANT_Long. It should
duke@435:   // not be seen by itself.
duke@435:   case JVM_CONSTANT_Invalid: // fall through
duke@435: 
duke@435:   default:
duke@435:   {
duke@435:     jbyte bad_value = tag_at(from_i).value(); // leave a breadcrumb
duke@435:     ShouldNotReachHere();
duke@435:   } break;
duke@435:   }
duke@435: } // end copy_entry_to()
duke@435: 
duke@435: 
duke@435: // Search constant pool search_cp for an entry that matches this
duke@435: // constant pool's entry at pattern_i. Returns the index of a
duke@435: // matching entry or zero (0) if there is no matching entry.
duke@435: int constantPoolOopDesc::find_matching_entry(int pattern_i,
duke@435:       constantPoolHandle search_cp, TRAPS) {
duke@435: 
duke@435:   // index zero (0) is not used
duke@435:   for (int i = 1; i < search_cp->length(); i++) {
duke@435:     bool found = compare_entry_to(pattern_i, search_cp, i, CHECK_0);
duke@435:     if (found) {
duke@435:       return i;
duke@435:     }
duke@435:   }
duke@435: 
duke@435:   return 0;  // entry not found; return unused index zero (0)
duke@435: } // end find_matching_entry()
duke@435: 
duke@435: 
duke@435: #ifndef PRODUCT
duke@435: 
duke@435: const char* constantPoolOopDesc::printable_name_at(int which) {
duke@435: 
duke@435:   constantTag tag = tag_at(which);
duke@435: 
duke@435:   if (tag.is_unresolved_string() || tag.is_string()) {
duke@435:     return string_at_noresolve(which);
duke@435:   } else if (tag.is_klass() || tag.is_unresolved_klass()) {
duke@435:     return klass_name_at(which)->as_C_string();
duke@435:   } else if (tag.is_symbol()) {
duke@435:     return symbol_at(which)->as_C_string();
duke@435:   }
duke@435:   return "";
duke@435: }
duke@435: 
duke@435: #endif // PRODUCT
duke@435: 
duke@435: 
duke@435: // JVMTI GetConstantPool support
duke@435: 
duke@435: // For temporary use until code is stable.
duke@435: #define DBG(code)
duke@435: 
duke@435: static const char* WARN_MSG = "Must not be such entry!";
duke@435: 
duke@435: static void print_cpool_bytes(jint cnt, u1 *bytes) {
duke@435:   jint size = 0;
duke@435:   u2   idx1, idx2;
duke@435: 
duke@435:   for (jint idx = 1; idx < cnt; idx++) {
duke@435:     jint ent_size = 0;
duke@435:     u1   tag  = *bytes++;
duke@435:     size++;                       // count tag
duke@435: 
duke@435:     printf("const #%03d, tag: %02d ", idx, tag);
duke@435:     switch(tag) {
duke@435:       case JVM_CONSTANT_Invalid: {
duke@435:         printf("Invalid");
duke@435:         break;
duke@435:       }
duke@435:       case JVM_CONSTANT_Unicode: {
duke@435:         printf("Unicode      %s", WARN_MSG);
duke@435:         break;
duke@435:       }
duke@435:       case JVM_CONSTANT_Utf8: {
duke@435:         u2 len = Bytes::get_Java_u2(bytes);
duke@435:         char str[128];
duke@435:         if (len > 127) {
duke@435:            len = 127;
duke@435:         }
duke@435:         strncpy(str, (char *) (bytes+2), len);
duke@435:         str[len] = '\0';
duke@435:         printf("Utf8          \"%s\"", str);
duke@435:         ent_size = 2 + len;
duke@435:         break;
duke@435:       }
duke@435:       case JVM_CONSTANT_Integer: {
duke@435:         u4 val = Bytes::get_Java_u4(bytes);
duke@435:         printf("int          %d", *(int *) &val);
duke@435:         ent_size = 4;
duke@435:         break;
duke@435:       }
duke@435:       case JVM_CONSTANT_Float: {
duke@435:         u4 val = Bytes::get_Java_u4(bytes);
duke@435:         printf("float        %5.3ff", *(float *) &val);
duke@435:         ent_size = 4;
duke@435:         break;
duke@435:       }
duke@435:       case JVM_CONSTANT_Long: {
duke@435:         u8 val = Bytes::get_Java_u8(bytes);
xlu@948:         printf("long         "INT64_FORMAT, *(jlong *) &val);
duke@435:         ent_size = 8;
duke@435:         idx++; // Long takes two cpool slots
duke@435:         break;
duke@435:       }
duke@435:       case JVM_CONSTANT_Double: {
duke@435:         u8 val = Bytes::get_Java_u8(bytes);
duke@435:         printf("double       %5.3fd", *(jdouble *)&val);
duke@435:         ent_size = 8;
duke@435:         idx++; // Double takes two cpool slots
duke@435:         break;
duke@435:       }
duke@435:       case JVM_CONSTANT_Class: {
duke@435:         idx1 = Bytes::get_Java_u2(bytes);
duke@435:         printf("class        #%03d", idx1);
duke@435:         ent_size = 2;
duke@435:         break;
duke@435:       }
duke@435:       case JVM_CONSTANT_String: {
duke@435:         idx1 = Bytes::get_Java_u2(bytes);
duke@435:         printf("String       #%03d", idx1);
duke@435:         ent_size = 2;
duke@435:         break;
duke@435:       }
duke@435:       case JVM_CONSTANT_Fieldref: {
duke@435:         idx1 = Bytes::get_Java_u2(bytes);
duke@435:         idx2 = Bytes::get_Java_u2(bytes+2);
duke@435:         printf("Field        #%03d, #%03d", (int) idx1, (int) idx2);
duke@435:         ent_size = 4;
duke@435:         break;
duke@435:       }
duke@435:       case JVM_CONSTANT_Methodref: {
duke@435:         idx1 = Bytes::get_Java_u2(bytes);
duke@435:         idx2 = Bytes::get_Java_u2(bytes+2);
duke@435:         printf("Method       #%03d, #%03d", idx1, idx2);
duke@435:         ent_size = 4;
duke@435:         break;
duke@435:       }
duke@435:       case JVM_CONSTANT_InterfaceMethodref: {
duke@435:         idx1 = Bytes::get_Java_u2(bytes);
duke@435:         idx2 = Bytes::get_Java_u2(bytes+2);
duke@435:         printf("InterfMethod #%03d, #%03d", idx1, idx2);
duke@435:         ent_size = 4;
duke@435:         break;
duke@435:       }
duke@435:       case JVM_CONSTANT_NameAndType: {
duke@435:         idx1 = Bytes::get_Java_u2(bytes);
duke@435:         idx2 = Bytes::get_Java_u2(bytes+2);
duke@435:         printf("NameAndType  #%03d, #%03d", idx1, idx2);
duke@435:         ent_size = 4;
duke@435:         break;
duke@435:       }
duke@435:       case JVM_CONSTANT_ClassIndex: {
duke@435:         printf("ClassIndex  %s", WARN_MSG);
duke@435:         break;
duke@435:       }
duke@435:       case JVM_CONSTANT_UnresolvedClass: {
duke@435:         printf("UnresolvedClass: %s", WARN_MSG);
duke@435:         break;
duke@435:       }
duke@435:       case JVM_CONSTANT_UnresolvedClassInError: {
duke@435:         printf("UnresolvedClassInErr: %s", WARN_MSG);
duke@435:         break;
duke@435:       }
duke@435:       case JVM_CONSTANT_StringIndex: {
duke@435:         printf("StringIndex: %s", WARN_MSG);
duke@435:         break;
duke@435:       }
duke@435:       case JVM_CONSTANT_UnresolvedString: {
duke@435:         printf("UnresolvedString: %s", WARN_MSG);
duke@435:         break;
duke@435:       }
duke@435:     }
duke@435:     printf(";\n");
duke@435:     bytes += ent_size;
duke@435:     size  += ent_size;
duke@435:   }
duke@435:   printf("Cpool size: %d\n", size);
duke@435:   fflush(0);
duke@435:   return;
duke@435: } /* end print_cpool_bytes */
duke@435: 
duke@435: 
duke@435: // Returns size of constant pool entry.
duke@435: jint constantPoolOopDesc::cpool_entry_size(jint idx) {
duke@435:   switch(tag_at(idx).value()) {
duke@435:     case JVM_CONSTANT_Invalid:
duke@435:     case JVM_CONSTANT_Unicode:
duke@435:       return 1;
duke@435: 
duke@435:     case JVM_CONSTANT_Utf8:
duke@435:       return 3 + symbol_at(idx)->utf8_length();
duke@435: 
duke@435:     case JVM_CONSTANT_Class:
duke@435:     case JVM_CONSTANT_String:
duke@435:     case JVM_CONSTANT_ClassIndex:
duke@435:     case JVM_CONSTANT_UnresolvedClass:
duke@435:     case JVM_CONSTANT_UnresolvedClassInError:
duke@435:     case JVM_CONSTANT_StringIndex:
duke@435:     case JVM_CONSTANT_UnresolvedString:
duke@435:       return 3;
duke@435: 
duke@435:     case JVM_CONSTANT_Integer:
duke@435:     case JVM_CONSTANT_Float:
duke@435:     case JVM_CONSTANT_Fieldref:
duke@435:     case JVM_CONSTANT_Methodref:
duke@435:     case JVM_CONSTANT_InterfaceMethodref:
duke@435:     case JVM_CONSTANT_NameAndType:
duke@435:       return 5;
duke@435: 
duke@435:     case JVM_CONSTANT_Long:
duke@435:     case JVM_CONSTANT_Double:
duke@435:       return 9;
duke@435:   }
duke@435:   assert(false, "cpool_entry_size: Invalid constant pool entry tag");
duke@435:   return 1;
duke@435: } /* end cpool_entry_size */
duke@435: 
duke@435: 
duke@435: // SymbolHashMap is used to find a constant pool index from a string.
duke@435: // This function fills in SymbolHashMaps, one for utf8s and one for
duke@435: // class names, returns size of the cpool raw bytes.
duke@435: jint constantPoolOopDesc::hash_entries_to(SymbolHashMap *symmap,
duke@435:                                           SymbolHashMap *classmap) {
duke@435:   jint size = 0;
duke@435: 
duke@435:   for (u2 idx = 1; idx < length(); idx++) {
duke@435:     u2 tag = tag_at(idx).value();
duke@435:     size += cpool_entry_size(idx);
duke@435: 
duke@435:     switch(tag) {
duke@435:       case JVM_CONSTANT_Utf8: {
duke@435:         symbolOop sym = symbol_at(idx);
duke@435:         symmap->add_entry(sym, idx);
duke@435:         DBG(printf("adding symbol entry %s = %d\n", sym->as_utf8(), idx));
duke@435:         break;
duke@435:       }
duke@435:       case JVM_CONSTANT_Class:
duke@435:       case JVM_CONSTANT_UnresolvedClass:
duke@435:       case JVM_CONSTANT_UnresolvedClassInError: {
duke@435:         symbolOop sym = klass_name_at(idx);
duke@435:         classmap->add_entry(sym, idx);
duke@435:         DBG(printf("adding class entry %s = %d\n", sym->as_utf8(), idx));
duke@435:         break;
duke@435:       }
duke@435:       case JVM_CONSTANT_Long:
duke@435:       case JVM_CONSTANT_Double: {
duke@435:         idx++; // Both Long and Double take two cpool slots
duke@435:         break;
duke@435:       }
duke@435:     }
duke@435:   }
duke@435:   return size;
duke@435: } /* end hash_utf8_entries_to */
duke@435: 
duke@435: 
duke@435: // Copy cpool bytes.
duke@435: // Returns:
duke@435: //    0, in case of OutOfMemoryError
duke@435: //   -1, in case of internal error
duke@435: //  > 0, count of the raw cpool bytes that have been copied
duke@435: int constantPoolOopDesc::copy_cpool_bytes(int cpool_size,
duke@435:                                           SymbolHashMap* tbl,
duke@435:                                           unsigned char *bytes) {
duke@435:   u2   idx1, idx2;
duke@435:   jint size  = 0;
duke@435:   jint cnt   = length();
duke@435:   unsigned char *start_bytes = bytes;
duke@435: 
duke@435:   for (jint idx = 1; idx < cnt; idx++) {
duke@435:     u1   tag      = tag_at(idx).value();
duke@435:     jint ent_size = cpool_entry_size(idx);
duke@435: 
duke@435:     assert(size + ent_size <= cpool_size, "Size mismatch");
duke@435: 
duke@435:     *bytes = tag;
duke@435:     DBG(printf("#%03hd tag=%03hd, ", idx, tag));
duke@435:     switch(tag) {
duke@435:       case JVM_CONSTANT_Invalid: {
duke@435:         DBG(printf("JVM_CONSTANT_Invalid"));
duke@435:         break;
duke@435:       }
duke@435:       case JVM_CONSTANT_Unicode: {
duke@435:         assert(false, "Wrong constant pool tag: JVM_CONSTANT_Unicode");
duke@435:         DBG(printf("JVM_CONSTANT_Unicode"));
duke@435:         break;
duke@435:       }
duke@435:       case JVM_CONSTANT_Utf8: {
duke@435:         symbolOop sym = symbol_at(idx);
duke@435:         char*     str = sym->as_utf8();
duke@435:         // Warning! It's crashing on x86 with len = sym->utf8_length()
duke@435:         int       len = (int) strlen(str);
duke@435:         Bytes::put_Java_u2((address) (bytes+1), (u2) len);
duke@435:         for (int i = 0; i < len; i++) {
duke@435:             bytes[3+i] = (u1) str[i];
duke@435:         }
duke@435:         DBG(printf("JVM_CONSTANT_Utf8: %s ", str));
duke@435:         break;
duke@435:       }
duke@435:       case JVM_CONSTANT_Integer: {
duke@435:         jint val = int_at(idx);
duke@435:         Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
duke@435:         break;
duke@435:       }
duke@435:       case JVM_CONSTANT_Float: {
duke@435:         jfloat val = float_at(idx);
duke@435:         Bytes::put_Java_u4((address) (bytes+1), *(u4*)&val);
duke@435:         break;
duke@435:       }
duke@435:       case JVM_CONSTANT_Long: {
duke@435:         jlong val = long_at(idx);
duke@435:         Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
duke@435:         idx++;             // Long takes two cpool slots
duke@435:         break;
duke@435:       }
duke@435:       case JVM_CONSTANT_Double: {
duke@435:         jdouble val = double_at(idx);
duke@435:         Bytes::put_Java_u8((address) (bytes+1), *(u8*)&val);
duke@435:         idx++;             // Double takes two cpool slots
duke@435:         break;
duke@435:       }
duke@435:       case JVM_CONSTANT_Class:
duke@435:       case JVM_CONSTANT_UnresolvedClass:
duke@435:       case JVM_CONSTANT_UnresolvedClassInError: {
duke@435:         *bytes = JVM_CONSTANT_Class;
duke@435:         symbolOop sym = klass_name_at(idx);
duke@435:         idx1 = tbl->symbol_to_value(sym);
duke@435:         assert(idx1 != 0, "Have not found a hashtable entry");
duke@435:         Bytes::put_Java_u2((address) (bytes+1), idx1);
duke@435:         DBG(printf("JVM_CONSTANT_Class: idx=#%03hd, %s", idx1, sym->as_utf8()));
duke@435:         break;
duke@435:       }
duke@435:       case JVM_CONSTANT_String: {
duke@435:         unsigned int hash;
duke@435:         char *str = string_at_noresolve(idx);
duke@435:         symbolOop sym = SymbolTable::lookup_only(str, (int) strlen(str), hash);
thurka@1208:         if (sym == NULL) {
thurka@1208:           // sym can be NULL if string refers to incorrectly encoded JVM_CONSTANT_Utf8
thurka@1208:           // this can happen with JVM TI; see CR 6839599 for more details
thurka@1208:           oop string = *(obj_at_addr(idx));
thurka@1208:           assert(java_lang_String::is_instance(string),"Not a String");
thurka@1208:           DBG(printf("Error #%03hd tag=%03hd\n", idx, tag));
thurka@1208:           idx1 = 0;
thurka@1208:           for (int j = 0; j < tbl->table_size() && idx1 == 0; j++) {
thurka@1208:             for (SymbolHashMapEntry* cur = tbl->bucket(j); cur != NULL; cur = cur->next()) {
thurka@1208:               int length;
thurka@1208:               sym = cur->symbol();
thurka@1208:               jchar* chars = sym->as_unicode(length);
thurka@1208:               if (java_lang_String::equals(string, chars, length)) {
thurka@1208:                 idx1 = cur->value();
thurka@1208:                 DBG(printf("Index found: %d\n",idx1));
thurka@1208:                 break;
thurka@1208:               }
thurka@1208:             }
thurka@1208:           }
thurka@1208:         } else {
thurka@1208:           idx1 = tbl->symbol_to_value(sym);
thurka@1208:         }
duke@435:         assert(idx1 != 0, "Have not found a hashtable entry");
duke@435:         Bytes::put_Java_u2((address) (bytes+1), idx1);
duke@435:         DBG(printf("JVM_CONSTANT_String: idx=#%03hd, %s", idx1, str));
duke@435:         break;
duke@435:       }
duke@435:       case JVM_CONSTANT_UnresolvedString: {
duke@435:         *bytes = JVM_CONSTANT_String;
duke@435:         symbolOop sym = unresolved_string_at(idx);
duke@435:         idx1 = tbl->symbol_to_value(sym);
duke@435:         assert(idx1 != 0, "Have not found a hashtable entry");
duke@435:         Bytes::put_Java_u2((address) (bytes+1), idx1);
duke@435:         DBG(char *str = sym->as_utf8());
duke@435:         DBG(printf("JVM_CONSTANT_UnresolvedString: idx=#%03hd, %s", idx1, str));
duke@435:         break;
duke@435:       }
duke@435:       case JVM_CONSTANT_Fieldref:
duke@435:       case JVM_CONSTANT_Methodref:
duke@435:       case JVM_CONSTANT_InterfaceMethodref: {
duke@435:         idx1 = uncached_klass_ref_index_at(idx);
duke@435:         idx2 = uncached_name_and_type_ref_index_at(idx);
duke@435:         Bytes::put_Java_u2((address) (bytes+1), idx1);
duke@435:         Bytes::put_Java_u2((address) (bytes+3), idx2);
duke@435:         DBG(printf("JVM_CONSTANT_Methodref: %hd %hd", idx1, idx2));
duke@435:         break;
duke@435:       }
duke@435:       case JVM_CONSTANT_NameAndType: {
duke@435:         idx1 = name_ref_index_at(idx);
duke@435:         idx2 = signature_ref_index_at(idx);
duke@435:         Bytes::put_Java_u2((address) (bytes+1), idx1);
duke@435:         Bytes::put_Java_u2((address) (bytes+3), idx2);
duke@435:         DBG(printf("JVM_CONSTANT_NameAndType: %hd %hd", idx1, idx2));
duke@435:         break;
duke@435:       }
duke@435:       case JVM_CONSTANT_ClassIndex: {
duke@435:         *bytes = JVM_CONSTANT_Class;
duke@435:         idx1 = klass_index_at(idx);
duke@435:         Bytes::put_Java_u2((address) (bytes+1), idx1);
duke@435:         DBG(printf("JVM_CONSTANT_ClassIndex: %hd", idx1));
duke@435:         break;
duke@435:       }
duke@435:       case JVM_CONSTANT_StringIndex: {
duke@435:         *bytes = JVM_CONSTANT_String;
duke@435:         idx1 = string_index_at(idx);
duke@435:         Bytes::put_Java_u2((address) (bytes+1), idx1);
duke@435:         DBG(printf("JVM_CONSTANT_StringIndex: %hd", idx1));
duke@435:         break;
duke@435:       }
duke@435:     }
duke@435:     DBG(printf("\n"));
duke@435:     bytes += ent_size;
duke@435:     size  += ent_size;
duke@435:   }
duke@435:   assert(size == cpool_size, "Size mismatch");
duke@435: 
duke@435:   // Keep temorarily for debugging until it's stable.
duke@435:   DBG(print_cpool_bytes(cnt, start_bytes));
duke@435:   return (int)(bytes - start_bytes);
duke@435: } /* end copy_cpool_bytes */
duke@435: 
duke@435: 
duke@435: void SymbolHashMap::add_entry(symbolOop sym, u2 value) {
duke@435:   char *str = sym->as_utf8();
duke@435:   unsigned int hash = compute_hash(str, sym->utf8_length());
duke@435:   unsigned int index = hash % table_size();
duke@435: 
duke@435:   // check if already in map
duke@435:   // we prefer the first entry since it is more likely to be what was used in
duke@435:   // the class file
duke@435:   for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
duke@435:     assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
duke@435:     if (en->hash() == hash && en->symbol() == sym) {
duke@435:         return;  // already there
duke@435:     }
duke@435:   }
duke@435: 
duke@435:   SymbolHashMapEntry* entry = new SymbolHashMapEntry(hash, sym, value);
duke@435:   entry->set_next(bucket(index));
duke@435:   _buckets[index].set_entry(entry);
duke@435:   assert(entry->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
duke@435: }
duke@435: 
duke@435: SymbolHashMapEntry* SymbolHashMap::find_entry(symbolOop sym) {
duke@435:   assert(sym != NULL, "SymbolHashMap::find_entry - symbol is NULL");
duke@435:   char *str = sym->as_utf8();
duke@435:   int   len = sym->utf8_length();
duke@435:   unsigned int hash = SymbolHashMap::compute_hash(str, len);
duke@435:   unsigned int index = hash % table_size();
duke@435:   for (SymbolHashMapEntry *en = bucket(index); en != NULL; en = en->next()) {
duke@435:     assert(en->symbol() != NULL, "SymbolHashMapEntry symbol is NULL");
duke@435:     if (en->hash() == hash && en->symbol() == sym) {
duke@435:       return en;
duke@435:     }
duke@435:   }
duke@435:   return NULL;
duke@435: }