jdk8-mips64-public/hotspot: src/share/vm/oops/constantPoolOop.hpp@c18cbe5936b8 (annotated)

src/share/vm/oops/constantPoolOop.hpp@c18cbe5936b8 (annotated)

src/share/vm/oops/constantPoolOop.hpp

Thu, 27 May 2010 19:08:38 -0700

author: trims
date: Thu, 27 May 2010 19:08:38 -0700
changeset 1907: c18cbe5936b8
parent 1573: dd57230ba8fe
child 1934: e9ff18c4ace7
permissions: -rw-r--r--

6941466: Oracle rebranding changes for Hotspot repositories
Summary: Change all the Sun copyrights to Oracle copyright
Reviewed-by: ohair

 /*
  * Copyright (c) 1997, 2009, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 // A constantPool is an array containing class constants as described in the
 // class file.
 //
 // Most of the constant pool entries are written during class parsing, which
 // is safe.  For klass and string types, the constant pool entry is
 // modified when the entry is resolved.  If a klass or string constant pool
 // entry is read without a lock, only the resolved state guarantees that
 // the entry in the constant pool is a klass or String object and
 // not a symbolOop.
 class SymbolHashMap;
 class constantPoolOopDesc : public oopDesc {
   friend class VMStructs;
   friend class BytecodeInterpreter;  // Directly extracts an oop in the pool for fast instanceof/checkcast
  private:
   typeArrayOop         _tags; // the tag array describing the constant pool's contents
   constantPoolCacheOop _cache;         // the cache holding interpreter runtime information
   klassOop             _pool_holder;   // the corresponding class
   int                  _flags;         // a few header bits to describe contents for GC
   int                  _length; // number of elements in the array
   volatile bool        _is_conc_safe; // if true, safe for concurrent
                                       // GC processing
   // only set to non-zero if constant pool is merged by RedefineClasses
   int                  _orig_length;
   void set_tags(typeArrayOop tags)             { oop_store_without_check((oop*)&_tags, tags); }
   void tag_at_put(int which, jbyte t)          { tags()->byte_at_put(which, t); }
   void release_tag_at_put(int which, jbyte t)  { tags()->release_byte_at_put(which, t); }
   enum FlagBit {
     FB_has_invokedynamic = 1,
     FB_has_pseudo_string = 2
   };
   int flags() const                         { return _flags; }
   void set_flags(int f)                     { _flags = f; }
   bool flag_at(FlagBit fb) const            { return (_flags & (1 << (int)fb)) != 0; }
   void set_flag_at(FlagBit fb);
   // no clear_flag_at function; they only increase
  private:
   intptr_t* base() const { return (intptr_t*) (((char*) this) + sizeof(constantPoolOopDesc)); }
   oop* tags_addr()       { return (oop*)&_tags; }
   oop* cache_addr()      { return (oop*)&_cache; }
   oop* obj_at_addr(int which) const {
     assert(is_within_bounds(which), "index out of bounds");
     return (oop*) &base()[which];
   }
   jint* int_at_addr(int which) const {
     assert(is_within_bounds(which), "index out of bounds");
     return (jint*) &base()[which];
   }
   jlong* long_at_addr(int which) const {
     assert(is_within_bounds(which), "index out of bounds");
     return (jlong*) &base()[which];
   }
   jfloat* float_at_addr(int which) const {
     assert(is_within_bounds(which), "index out of bounds");
     return (jfloat*) &base()[which];
   }
   jdouble* double_at_addr(int which) const {
     assert(is_within_bounds(which), "index out of bounds");
     return (jdouble*) &base()[which];
   }
  public:
   typeArrayOop tags() const                 { return _tags; }
   bool has_pseudo_string() const            { return flag_at(FB_has_pseudo_string); }
   bool has_invokedynamic() const            { return flag_at(FB_has_invokedynamic); }
   void set_pseudo_string()                  {    set_flag_at(FB_has_pseudo_string); }
   void set_invokedynamic()                  {    set_flag_at(FB_has_invokedynamic); }
   // Klass holding pool
   klassOop pool_holder() const              { return _pool_holder; }
   void set_pool_holder(klassOop k)          { oop_store_without_check((oop*)&_pool_holder, (oop) k); }
   oop* pool_holder_addr()                   { return (oop*)&_pool_holder; }
   // Interpreter runtime support
   constantPoolCacheOop cache() const        { return _cache; }
   void set_cache(constantPoolCacheOop cache){ oop_store((oop*)&_cache, cache); }
   // Assembly code support
   static int tags_offset_in_bytes()         { return offset_of(constantPoolOopDesc, _tags); }
   static int cache_offset_in_bytes()        { return offset_of(constantPoolOopDesc, _cache); }
   static int pool_holder_offset_in_bytes()  { return offset_of(constantPoolOopDesc, _pool_holder); }
   // Storing constants
   void klass_at_put(int which, klassOop k) {
     oop_store_without_check((volatile oop *)obj_at_addr(which), oop(k));
     // The interpreter assumes when the tag is stored, the klass is resolved
     // and the klassOop is a klass rather than a symbolOop, so we need
     // hardware store ordering here.
     release_tag_at_put(which, JVM_CONSTANT_Class);
     if (UseConcMarkSweepGC) {
       // In case the earlier card-mark was consumed by a concurrent
       // marking thread before the tag was updated, redirty the card.
       oop_store_without_check((volatile oop *)obj_at_addr(which), oop(k));
     }
   }
   // For temporary use while constructing constant pool
   void klass_index_at_put(int which, int name_index) {
     tag_at_put(which, JVM_CONSTANT_ClassIndex);
     *int_at_addr(which) = name_index;
   }
   // Temporary until actual use
   void unresolved_klass_at_put(int which, symbolOop s) {
     // Overwrite the old index with a GC friendly value so
     // that if GC looks during the transition it won't try
     // to treat a small integer as oop.
     *obj_at_addr(which) = NULL;
     release_tag_at_put(which, JVM_CONSTANT_UnresolvedClass);
     oop_store_without_check(obj_at_addr(which), oop(s));
   }
   // Temporary until actual use
   void unresolved_string_at_put(int which, symbolOop s) {
     *obj_at_addr(which) = NULL;
     release_tag_at_put(which, JVM_CONSTANT_UnresolvedString);
     oop_store_without_check(obj_at_addr(which), oop(s));
   }
   void int_at_put(int which, jint i) {
     tag_at_put(which, JVM_CONSTANT_Integer);
     *int_at_addr(which) = i;
   }
   void long_at_put(int which, jlong l) {
     tag_at_put(which, JVM_CONSTANT_Long);
     // *long_at_addr(which) = l;
     Bytes::put_native_u8((address)long_at_addr(which), *((u8*) &l));
   }
   void float_at_put(int which, jfloat f) {
     tag_at_put(which, JVM_CONSTANT_Float);
     *float_at_addr(which) = f;
   }
   void double_at_put(int which, jdouble d) {
     tag_at_put(which, JVM_CONSTANT_Double);
     // *double_at_addr(which) = d;
     // u8 temp = *(u8*) &d;
     Bytes::put_native_u8((address) double_at_addr(which), *((u8*) &d));
   }
   void symbol_at_put(int which, symbolOop s) {
     tag_at_put(which, JVM_CONSTANT_Utf8);
     oop_store_without_check(obj_at_addr(which), oop(s));
   }
   void string_at_put(int which, oop str) {
     oop_store((volatile oop*)obj_at_addr(which), str);
     release_tag_at_put(which, JVM_CONSTANT_String);
     if (UseConcMarkSweepGC) {
       // In case the earlier card-mark was consumed by a concurrent
       // marking thread before the tag was updated, redirty the card.
       oop_store_without_check((volatile oop *)obj_at_addr(which), str);
     }
   }
   void object_at_put(int which, oop str) {
     oop_store((volatile oop*) obj_at_addr(which), str);
     release_tag_at_put(which, JVM_CONSTANT_Object);
     if (UseConcMarkSweepGC) {
       // In case the earlier card-mark was consumed by a concurrent
       // marking thread before the tag was updated, redirty the card.
       oop_store_without_check((volatile oop*) obj_at_addr(which), str);
     }
   }
   // For temporary use while constructing constant pool
   void string_index_at_put(int which, int string_index) {
     tag_at_put(which, JVM_CONSTANT_StringIndex);
     *int_at_addr(which) = string_index;
   }
   void field_at_put(int which, int class_index, int name_and_type_index) {
     tag_at_put(which, JVM_CONSTANT_Fieldref);
     *int_at_addr(which) = ((jint) name_and_type_index<<16) | class_index;
   }
   void method_at_put(int which, int class_index, int name_and_type_index) {
     tag_at_put(which, JVM_CONSTANT_Methodref);
     *int_at_addr(which) = ((jint) name_and_type_index<<16) | class_index;
   }
   void interface_method_at_put(int which, int class_index, int name_and_type_index) {
     tag_at_put(which, JVM_CONSTANT_InterfaceMethodref);
     *int_at_addr(which) = ((jint) name_and_type_index<<16) | class_index;  // Not so nice
   }
   void name_and_type_at_put(int which, int name_index, int signature_index) {
     tag_at_put(which, JVM_CONSTANT_NameAndType);
     *int_at_addr(which) = ((jint) signature_index<<16) | name_index;  // Not so nice
   }
   // Tag query
   constantTag tag_at(int which) const { return (constantTag)tags()->byte_at_acquire(which); }
   // Whether the entry is a pointer that must be GC'd.
   bool is_pointer_entry(int which) {
     constantTag tag = tag_at(which);
     return tag.is_klass() ||
       tag.is_unresolved_klass() ||
       tag.is_symbol() ||
       tag.is_unresolved_string() ||
       tag.is_string() ||
       tag.is_object();
   }
   // Fetching constants
   klassOop klass_at(int which, TRAPS) {
     constantPoolHandle h_this(THREAD, this);
     return klass_at_impl(h_this, which, CHECK_NULL);
   }
   symbolOop klass_name_at(int which);  // Returns the name, w/o resolving.
   klassOop resolved_klass_at(int which) {  // Used by Compiler
     guarantee(tag_at(which).is_klass(), "Corrupted constant pool");
     // Must do an acquire here in case another thread resolved the klass
     // behind our back, lest we later load stale values thru the oop.
     return klassOop((oop)OrderAccess::load_ptr_acquire(obj_at_addr(which)));
   }
   // This method should only be used with a cpool lock or during parsing or gc
   symbolOop unresolved_klass_at(int which) {     // Temporary until actual use
     symbolOop s = symbolOop((oop)OrderAccess::load_ptr_acquire(obj_at_addr(which)));
     // check that the klass is still unresolved.
     assert(tag_at(which).is_unresolved_klass(), "Corrupted constant pool");
     return s;
   }
   // RedefineClasses() API support:
   symbolOop klass_at_noresolve(int which) { return klass_name_at(which); }
   jint int_at(int which) {
     assert(tag_at(which).is_int(), "Corrupted constant pool");
     return *int_at_addr(which);
   }
   jlong long_at(int which) {
     assert(tag_at(which).is_long(), "Corrupted constant pool");
     // return *long_at_addr(which);
     u8 tmp = Bytes::get_native_u8((address)&base()[which]);
     return *((jlong*)&tmp);
   }
   jfloat float_at(int which) {
     assert(tag_at(which).is_float(), "Corrupted constant pool");
     return *float_at_addr(which);
   }
   jdouble double_at(int which) {
     assert(tag_at(which).is_double(), "Corrupted constant pool");
     u8 tmp = Bytes::get_native_u8((address)&base()[which]);
     return *((jdouble*)&tmp);
   }
   symbolOop symbol_at(int which) {
     assert(tag_at(which).is_utf8(), "Corrupted constant pool");
     return symbolOop(*obj_at_addr(which));
   }
   oop string_at(int which, TRAPS) {
     constantPoolHandle h_this(THREAD, this);
     return string_at_impl(h_this, which, CHECK_NULL);
   }
   oop object_at(int which) {
     assert(tag_at(which).is_object(), "Corrupted constant pool");
     return *obj_at_addr(which);
   }
   // A "pseudo-string" is an non-string oop that has found is way into
   // a String entry.
   // Under AnonymousClasses this can happen if the user patches a live
   // object into a CONSTANT_String entry of an anonymous class.
   // Method oops internally created for method handles may also
   // use pseudo-strings to link themselves to related metaobjects.
   bool is_pseudo_string_at(int which);
   oop pseudo_string_at(int which) {
     assert(tag_at(which).is_string(), "Corrupted constant pool");
     return *obj_at_addr(which);
   }
   void pseudo_string_at_put(int which, oop x) {
     assert(AnonymousClasses, "");
     set_pseudo_string();        // mark header
     assert(tag_at(which).is_string() || tag_at(which).is_unresolved_string(), "Corrupted constant pool");
     string_at_put(which, x);    // this works just fine
   }
   // only called when we are sure a string entry is already resolved (via an
   // earlier string_at call.
   oop resolved_string_at(int which) {
     assert(tag_at(which).is_string(), "Corrupted constant pool");
     // Must do an acquire here in case another thread resolved the klass
     // behind our back, lest we later load stale values thru the oop.
     return (oop)OrderAccess::load_ptr_acquire(obj_at_addr(which));
   }
   // This method should only be used with a cpool lock or during parsing or gc
   symbolOop unresolved_string_at(int which) {    // Temporary until actual use
     symbolOop s = symbolOop((oop)OrderAccess::load_ptr_acquire(obj_at_addr(which)));
     // check that the string is still unresolved.
     assert(tag_at(which).is_unresolved_string(), "Corrupted constant pool");
     return s;
   }
   // Returns an UTF8 for a CONSTANT_String entry at a given index.
   // UTF8 char* representation was chosen to avoid conversion of
   // java_lang_Strings at resolved entries into symbolOops
   // or vice versa.
   // Caller is responsible for checking for pseudo-strings.
   char* string_at_noresolve(int which);
   jint name_and_type_at(int which) {
     assert(tag_at(which).is_name_and_type(), "Corrupted constant pool");
     return *int_at_addr(which);
   }
   // The following methods (name/signature/klass_ref_at, klass_ref_at_noresolve,
   // name_and_type_ref_index_at) all expect to be passed indices obtained
   // directly from the bytecode, and extracted according to java byte order.
   // If the indices are meant to refer to fields or methods, they are
   // actually potentially byte-swapped, rewritten constant pool cache indices.
   // The routine remap_instruction_operand_from_cache manages the adjustment
   // of these values back to constant pool indices.
   // There are also "uncached" versions which do not adjust the operand index; see below.
   // Lookup for entries consisting of (klass_index, name_and_type index)
   klassOop klass_ref_at(int which, TRAPS);
   symbolOop klass_ref_at_noresolve(int which);
   symbolOop name_ref_at(int which)                { return impl_name_ref_at(which, false); }
   symbolOop signature_ref_at(int which)           { return impl_signature_ref_at(which, false); }
   int klass_ref_index_at(int which)               { return impl_klass_ref_index_at(which, false); }
   int name_and_type_ref_index_at(int which)       { return impl_name_and_type_ref_index_at(which, false); }
   // Lookup for entries consisting of (name_index, signature_index)
   int name_ref_index_at(int which_nt);            // ==  low-order jshort of name_and_type_at(which_nt)
   int signature_ref_index_at(int which_nt);       // == high-order jshort of name_and_type_at(which_nt)
   BasicType basic_type_for_signature_at(int which);
   // Resolve string constants (to prevent allocation during compilation)
   void resolve_string_constants(TRAPS) {
     constantPoolHandle h_this(THREAD, this);
     resolve_string_constants_impl(h_this, CHECK);
   }
   // Klass name matches name at offset
   bool klass_name_at_matches(instanceKlassHandle k, int which);
   // Sizing
   int length() const                   { return _length; }
   void set_length(int length)          { _length = length; }
   // Tells whether index is within bounds.
   bool is_within_bounds(int index) const {
     return 0 <= index && index < length();
   }
   static int header_size()             { return sizeof(constantPoolOopDesc)/HeapWordSize; }
   static int object_size(int length)   { return align_object_size(header_size() + length); }
   int object_size()                    { return object_size(length()); }
   bool is_conc_safe()                  { return _is_conc_safe; }
   void set_is_conc_safe(bool v)        { _is_conc_safe = v; }
   friend class constantPoolKlass;
   friend class ClassFileParser;
   friend class SystemDictionary;
   // Used by compiler to prevent classloading.
   static klassOop klass_at_if_loaded          (constantPoolHandle this_oop, int which);
   static klassOop klass_ref_at_if_loaded      (constantPoolHandle this_oop, int which);
   // Same as above - but does LinkResolving.
   static klassOop klass_ref_at_if_loaded_check(constantPoolHandle this_oop, int which, TRAPS);
   // Routines currently used for annotations (only called by jvm.cpp) but which might be used in the
   // future by other Java code. These take constant pool indices rather than possibly-byte-swapped
   // constant pool cache indices as do the peer methods above.
   symbolOop uncached_name_ref_at(int which)                 { return impl_name_ref_at(which, true); }
   symbolOop uncached_signature_ref_at(int which)            { return impl_signature_ref_at(which, true); }
   int       uncached_klass_ref_index_at(int which)          { return impl_klass_ref_index_at(which, true); }
   int       uncached_name_and_type_ref_index_at(int which)  { return impl_name_and_type_ref_index_at(which, true); }
   // Sharing
   int pre_resolve_shared_klasses(TRAPS);
   void shared_symbols_iterate(OopClosure* closure0);
   void shared_tags_iterate(OopClosure* closure0);
   void shared_strings_iterate(OopClosure* closure0);
   // Debugging
   const char* printable_name_at(int which) PRODUCT_RETURN0;
  private:
   symbolOop impl_name_ref_at(int which, bool uncached);
   symbolOop impl_signature_ref_at(int which, bool uncached);
   int       impl_klass_ref_index_at(int which, bool uncached);
   int       impl_name_and_type_ref_index_at(int which, bool uncached);
   int remap_instruction_operand_from_cache(int operand);
   // Used while constructing constant pool (only by ClassFileParser)
   jint klass_index_at(int which) {
     assert(tag_at(which).is_klass_index(), "Corrupted constant pool");
     return *int_at_addr(which);
   }
   jint string_index_at(int which) {
     assert(tag_at(which).is_string_index(), "Corrupted constant pool");
     return *int_at_addr(which);
   }
   // Performs the LinkResolver checks
   static void verify_constant_pool_resolve(constantPoolHandle this_oop, KlassHandle klass, TRAPS);
   // Implementation of methods that needs an exposed 'this' pointer, in order to
   // handle GC while executing the method
   static klassOop klass_at_impl(constantPoolHandle this_oop, int which, TRAPS);
   static oop string_at_impl(constantPoolHandle this_oop, int which, TRAPS);
   // Resolve string constants (to prevent allocation during compilation)
   static void resolve_string_constants_impl(constantPoolHandle this_oop, TRAPS);
  public:
   // Merging constantPoolOop support:
   bool compare_entry_to(int index1, constantPoolHandle cp2, int index2, TRAPS);
   void copy_cp_to(int start_i, int end_i, constantPoolHandle to_cp, int to_i,
     TRAPS);
   void copy_entry_to(int from_i, constantPoolHandle to_cp, int to_i, TRAPS);
   int  find_matching_entry(int pattern_i, constantPoolHandle search_cp, TRAPS);
   int  orig_length() const                { return _orig_length; }
   void set_orig_length(int orig_length)   { _orig_length = orig_length; }
   // JVMTI accesss - GetConstantPool, RetransformClasses, ...
   friend class JvmtiConstantPoolReconstituter;
  private:
   jint cpool_entry_size(jint idx);
   jint hash_entries_to(SymbolHashMap *symmap, SymbolHashMap *classmap);
   // Copy cpool bytes into byte array.
   // Returns:
   //  int > 0, count of the raw cpool bytes that have been copied
   //        0, OutOfMemory error
   //       -1, Internal error
   int  copy_cpool_bytes(int cpool_size,
                         SymbolHashMap* tbl,
                         unsigned char *bytes);
 };
 class SymbolHashMapEntry : public CHeapObj {
  private:
   unsigned int        _hash;   // 32-bit hash for item
   SymbolHashMapEntry* _next;   // Next element in the linked list for this bucket
   symbolOop           _symbol; // 1-st part of the mapping: symbol => value
   u2                  _value;  // 2-nd part of the mapping: symbol => value
  public:
   unsigned   int hash() const             { return _hash;   }
   void       set_hash(unsigned int hash)  { _hash = hash;   }
   SymbolHashMapEntry* next() const        { return _next;   }
   void set_next(SymbolHashMapEntry* next) { _next = next;   }
   symbolOop  symbol() const               { return _symbol; }
   void       set_symbol(symbolOop sym)    { _symbol = sym;  }
   u2         value() const                {  return _value; }
   void       set_value(u2 value)          { _value = value; }
   SymbolHashMapEntry(unsigned int hash, symbolOop symbol, u2 value)
     : _hash(hash), _symbol(symbol), _value(value), _next(NULL) {}
 }; // End SymbolHashMapEntry class
 class SymbolHashMapBucket : public CHeapObj {
 private:
   SymbolHashMapEntry*    _entry;
 public:
   SymbolHashMapEntry* entry() const         {  return _entry; }
   void set_entry(SymbolHashMapEntry* entry) { _entry = entry; }
   void clear()                              { _entry = NULL;  }
 }; // End SymbolHashMapBucket class
 class SymbolHashMap: public CHeapObj {
  private:
   // Default number of entries in the table
   enum SymbolHashMap_Constants {
     _Def_HashMap_Size = 256
   };
   int                   _table_size;
   SymbolHashMapBucket*  _buckets;
   void initialize_table(int table_size) {
     _table_size = table_size;
     _buckets = NEW_C_HEAP_ARRAY(SymbolHashMapBucket, table_size);
     for (int index = 0; index < table_size; index++) {
       _buckets[index].clear();
     }
   }
  public:
   int table_size() const        { return _table_size; }
   SymbolHashMap()               { initialize_table(_Def_HashMap_Size); }
   SymbolHashMap(int table_size) { initialize_table(table_size); }
   // hash P(31) from Kernighan & Ritchie
   static unsigned int compute_hash(const char* str, int len) {
     unsigned int hash = 0;
     while (len-- > 0) {
       hash = 31*hash + (unsigned) *str;
       str++;
     }
     return hash;
   }
   SymbolHashMapEntry* bucket(int i) {
     return _buckets[i].entry();
   }
   void add_entry(symbolOop sym, u2 value);
   SymbolHashMapEntry* find_entry(symbolOop sym);
   u2 symbol_to_value(symbolOop sym) {
     SymbolHashMapEntry *entry = find_entry(sym);
     return (entry == NULL) ? 0 : entry->value();
   }
   ~SymbolHashMap() {
     SymbolHashMapEntry* next;
     for (int i = 0; i < _table_size; i++) {
       for (SymbolHashMapEntry* cur = bucket(i); cur != NULL; cur = next) {
         next = cur->next();
         delete(cur);
       }
     }
     delete _buckets;
   }
 }; // End SymbolHashMap class

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/oops/constantPoolOop.hpp@c18cbe5936b8 (annotated)

src/share/vm/oops/constantPoolOop.hpp