diff -r 000000000000 -r a61af66fc99e src/share/vm/oops/constantPoolOop.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/oops/constantPoolOop.cpp Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,1269 @@ +/* + * Copyright 1997-2006 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" + +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::uncached_name_ref_at(int which) { + jint ref_index = name_and_type_at(uncached_name_and_type_ref_index_at(which)); + int name_index = extract_low_short_from_int(ref_index); + return symbol_at(name_index); +} + + +symbolOop constantPoolOopDesc::uncached_signature_ref_at(int which) { + jint ref_index = name_and_type_at(uncached_name_and_type_ref_index_at(which)); + int signature_index = extract_high_short_from_int(ref_index); + return symbol_at(signature_index); +} + + +int constantPoolOopDesc::uncached_name_and_type_ref_index_at(int which) { + jint ref_index = field_or_method_at(which, true); + return extract_high_short_from_int(ref_index); +} + + +int constantPoolOopDesc::uncached_klass_ref_index_at(int which) { + jint ref_index = field_or_method_at(which, true); + return extract_low_short_from_int(ref_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::klass_ref_index_at(int which) { + jint ref_index = field_or_method_at(which, false); + return extract_low_short_from_int(ref_index); +} + + +int constantPoolOopDesc::name_and_type_ref_index_at(int which) { + jint ref_index = field_or_method_at(which, false); + return extract_high_short_from_int(ref_index); +} + + +int constantPoolOopDesc::name_ref_index_at(int which) { + jint ref_index = name_and_type_at(which); + return extract_low_short_from_int(ref_index); +} + + +int constantPoolOopDesc::signature_ref_index_at(int which) { + jint ref_index = name_and_type_at(which); + 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 { + return java_lang_String::as_utf8_string(entry); + } +} + + +symbolOop constantPoolOopDesc::name_ref_at(int which) { + jint ref_index = name_and_type_at(name_and_type_ref_index_at(which)); + int name_index = extract_low_short_from_int(ref_index); + return symbol_at(name_index); +} + + +symbolOop constantPoolOopDesc::signature_ref_at(int which) { + jint ref_index = name_and_type_at(name_and_type_ref_index_at(which)); + int signature_index = extract_high_short_from_int(ref_index); + return symbol_at(signature_index); +} + + +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::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 %lldl", *(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); + 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; +}