truffle: src/share/vm/oops/constantPoolOop.hpp comparison

comparison src/share/vm/oops/constantPoolOop.hpp @ 0:a61af66fc99e jdk7-b24

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author	duke
date	Sat, 01 Dec 2007 00:00:00 +0000
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children	ba764ed4b6f2

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+/*
+* Copyright 1997-2007 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.
+*
+*/
+// 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 arrayOopDesc {
+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
+// 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); }
+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; }
+// 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);
+}
+}
+// 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();
+}
+// 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);
+}
+// 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.
+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 (klass_ref_at, klass_ref_at_noresolve, name_ref_at,
+// signature_ref_at, klass_ref_index_at, name_and_type_ref_index_at,
+// name_ref_index_at, signature_ref_index_at) all expect constant pool indices
+// from the bytecodes to be passed in, which are actually potentially byte-swapped
+// contstant pool cache indices. See field_or_method_at.
+// 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);
+symbolOop signature_ref_at(int which);    // the type descriptor
+int klass_ref_index_at(int which);
+int name_and_type_ref_index_at(int which);
+// Lookup for entries consisting of (name_index, signature_index)
+int name_ref_index_at(int which);
+int signature_ref_index_at(int which);
+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
+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()); }
+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);
+symbolOop uncached_signature_ref_at(int which);
+int       uncached_klass_ref_index_at(int which);
+int       uncached_name_and_type_ref_index_at(int which);
+// 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:
+// Takes either a constant pool cache index in possibly byte-swapped
+// byte order (which comes from the bytecodes after rewriting) or,
+// if "uncached" is true, a vanilla constant pool index
+jint field_or_method_at(int which, bool uncached) {
+int i = -1;
+if (uncached || cache() == NULL) {
+i = which;
+} else {
+// change byte-ordering and go via cache
+i = cache()->entry_at(Bytes::swap_u2(which))->constant_pool_index();
+}
+assert(tag_at(i).is_field_or_method(), "Corrupted constant pool");
+return *int_at_addr(i);
+}
+// 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 > hg > truffle

comparison src/share/vm/oops/constantPoolOop.hpp @ 0:a61af66fc99e jdk7-b24