Mercurial > hg > truffle
diff src/share/vm/oops/constantPoolOop.hpp @ 0:a61af66fc99e jdk7-b24
Initial load
author | duke |
---|---|
date | Sat, 01 Dec 2007 00:00:00 +0000 |
parents | |
children | ba764ed4b6f2 |
line wrap: on
line diff
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/share/vm/oops/constantPoolOop.hpp Sat Dec 01 00:00:00 2007 +0000 @@ -0,0 +1,528 @@ +/* + * 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