--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/share/vm/oops/constMethodOop.hpp	Sat Dec 01 00:00:00 2007 +0000
@@ -0,0 +1,295 @@
+/*
+ * Copyright 2003-2006 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.
+ *
+ */
+
+// An constMethodOop represents portions of a Java method which
+// do not vary.
+//
+// Memory layout (each line represents a word). Note that most
+// applications load thousands of methods, so keeping the size of this
+// structure small has a big impact on footprint.
+//
+// |------------------------------------------------------|
+// | header                                               |
+// | klass                                                |
+// |------------------------------------------------------|
+// | fingerprint 1                                        |
+// | fingerprint 2                                        |
+// | method                         (oop)                 |
+// | stackmap_data                  (oop)                 |
+// | exception_table                (oop)                 |
+// | constMethod_size                                     |
+// | interp_kind  | flags    | code_size                  |
+// | name index              | signature index            |
+// | method_idnum            | generic_signature_index    |
+// |------------------------------------------------------|
+// |                                                      |
+// | byte codes                                           |
+// |                                                      |
+// |------------------------------------------------------|
+// | compressed linenumber table                          |
+// |  (see class CompressedLineNumberReadStream)          |
+// |  (note that length is unknown until decompressed)    |
+// |  (access flags bit tells whether table is present)   |
+// |  (indexed from start of constMethodOop)              |
+// |  (elements not necessarily sorted!)                  |
+// |------------------------------------------------------|
+// | localvariable table elements + length (length last)  |
+// |  (length is u2, elements are 6-tuples of u2)         |
+// |  (see class LocalVariableTableElement)               |
+// |  (access flags bit tells whether table is present)   |
+// |  (indexed from end of contMethodOop)                 |
+// |------------------------------------------------------|
+// | checked exceptions elements + length (length last)   |
+// |  (length is u2, elements are u2)                     |
+// |  (see class CheckedExceptionElement)                 |
+// |  (access flags bit tells whether table is present)   |
+// |  (indexed from end of constMethodOop)                |
+// |------------------------------------------------------|
+
+
+// Utitily class decribing elements in checked exceptions table inlined in methodOop.
+class CheckedExceptionElement VALUE_OBJ_CLASS_SPEC {
+ public:
+  u2 class_cp_index;
+};
+
+
+// Utitily class decribing elements in local variable table inlined in methodOop.
+class LocalVariableTableElement VALUE_OBJ_CLASS_SPEC {
+ public:
+  u2 start_bci;
+  u2 length;
+  u2 name_cp_index;
+  u2 descriptor_cp_index;
+  u2 signature_cp_index;
+  u2 slot;
+};
+
+
+class constMethodOopDesc : public oopDesc {
+  friend class constMethodKlass;
+  friend class VMStructs;
+private:
+  enum {
+    _has_linenumber_table = 1,
+    _has_checked_exceptions = 2,
+    _has_localvariable_table = 4
+  };
+
+  // Bit vector of signature
+  // Callers interpret 0=not initialized yet and
+  // -1=too many args to fix, must parse the slow way.
+  // The real initial value is special to account for nonatomicity of 64 bit
+  // loads and stores.  This value may updated and read without a lock by
+  // multiple threads, so is volatile.
+  volatile uint64_t _fingerprint;
+
+public:
+  oop* oop_block_beg() const { return adr_method(); }
+  oop* oop_block_end() const { return adr_exception_table() + 1; }
+
+private:
+  //
+  // The oop block.  See comment in klass.hpp before making changes.
+  //
+
+  // Backpointer to non-const methodOop (needed for some JVMTI operations)
+  methodOop         _method;
+
+  // Raw stackmap data for the method
+  typeArrayOop      _stackmap_data;
+
+  // The exception handler table. 4-tuples of ints [start_pc, end_pc,
+  // handler_pc, catch_type index] For methods with no exceptions the
+  // table is pointing to Universe::the_empty_int_array
+  typeArrayOop      _exception_table;
+
+  //
+  // End of the oop block.
+  //
+
+  int               _constMethod_size;
+  jbyte             _interpreter_kind;
+  jbyte             _flags;
+
+  // Size of Java bytecodes allocated immediately after methodOop.
+  u2                _code_size;
+  u2                _name_index;                 // Method name (index in constant pool)
+  u2                _signature_index;            // Method signature (index in constant pool)
+  u2                _method_idnum;               // unique identification number for the method within the class
+                                                 // initially corresponds to the index into the methods array.
+                                                 // but this may change with redefinition
+  u2                _generic_signature_index;    // Generic signature (index in constant pool, 0 if absent)
+
+public:
+  // Inlined tables
+  void set_inlined_tables_length(int checked_exceptions_len,
+                                 int compressed_line_number_size,
+                                 int localvariable_table_len);
+
+  bool has_linenumber_table() const
+    { return (_flags & _has_linenumber_table) != 0; }
+
+  bool has_checked_exceptions() const
+    { return (_flags & _has_checked_exceptions) != 0; }
+
+  bool has_localvariable_table() const
+    { return (_flags & _has_localvariable_table) != 0; }
+
+  void set_interpreter_kind(int kind)      { _interpreter_kind = kind; }
+  int  interpreter_kind(void) const        { return _interpreter_kind; }
+
+  // backpointer to non-const methodOop
+  methodOop method() const                 { return _method; }
+  void set_method(methodOop m)             { oop_store_without_check((oop*)&_method, (oop) m); }
+
+
+  // stackmap table data
+  typeArrayOop stackmap_data() const { return _stackmap_data; }
+  void set_stackmap_data(typeArrayOop sd) {
+    oop_store_without_check((oop*)&_stackmap_data, (oop)sd);
+  }
+  bool has_stackmap_table() const { return _stackmap_data != NULL; }
+
+  // exception handler table
+  typeArrayOop exception_table() const           { return _exception_table; }
+  void set_exception_table(typeArrayOop e)       { oop_store_without_check((oop*) &_exception_table, (oop) e); }
+  bool has_exception_handler() const             { return exception_table() != NULL && exception_table()->length() > 0; }
+
+  void init_fingerprint() {
+    const uint64_t initval = CONST64(0x8000000000000000);
+    _fingerprint = initval;
+  }
+
+  uint64_t fingerprint() const                   {
+    // Since reads aren't atomic for 64 bits, if any of the high or low order
+    // word is the initial value, return 0.  See init_fingerprint for initval.
+    uint high_fp = (uint)(_fingerprint >> 32);
+    if ((int) _fingerprint == 0 || high_fp == 0x80000000) {
+      return 0L;
+    } else {
+      return _fingerprint;
+    }
+  }
+
+  uint64_t set_fingerprint(uint64_t new_fingerprint) {
+#ifdef ASSERT
+    // Assert only valid if complete/valid 64 bit _fingerprint value is read.
+    uint64_t oldfp = fingerprint();
+#endif // ASSERT
+    _fingerprint = new_fingerprint;
+    assert(oldfp == 0L || new_fingerprint == oldfp,
+           "fingerprint cannot change");
+    assert(((new_fingerprint >> 32) != 0x80000000) && (int)new_fingerprint !=0,
+           "fingerprint should call init to set initial value");
+    return new_fingerprint;
+  }
+
+  // name
+  int name_index() const                         { return _name_index; }
+  void set_name_index(int index)                 { _name_index = index; }
+
+  // signature
+  int signature_index() const                    { return _signature_index; }
+  void set_signature_index(int index)            { _signature_index = index; }
+
+  // generics support
+  int generic_signature_index() const            { return _generic_signature_index; }
+  void set_generic_signature_index(int index)    { _generic_signature_index = index; }
+
+  // Sizing
+  static int header_size() {
+    return sizeof(constMethodOopDesc)/HeapWordSize;
+  }
+
+  // Object size needed
+  static int object_size(int code_size, int compressed_line_number_size,
+                         int local_variable_table_length,
+                         int checked_exceptions_length);
+
+  int object_size() const                 { return _constMethod_size; }
+  void set_constMethod_size(int size)     { _constMethod_size = size; }
+  // Is object parsable by gc
+  bool object_is_parsable()               { return object_size() > 0; }
+
+  // code size
+  int code_size() const                          { return _code_size; }
+  void set_code_size(int size) {
+    assert(max_method_code_size < (1 << 16),
+           "u2 is too small to hold method code size in general");
+    assert(0 <= size && size <= max_method_code_size, "invalid code size");
+    _code_size = size;
+  }
+
+  // linenumber table - note that length is unknown until decompression,
+  // see class CompressedLineNumberReadStream.
+  u_char* compressed_linenumber_table() const;         // not preserved by gc
+  u2* checked_exceptions_length_addr() const;
+  u2* localvariable_table_length_addr() const;
+
+  // checked exceptions
+  int checked_exceptions_length() const;
+  CheckedExceptionElement* checked_exceptions_start() const;
+
+  // localvariable table
+  int localvariable_table_length() const;
+  LocalVariableTableElement* localvariable_table_start() const;
+
+  // byte codes
+  address code_base() const            { return (address) (this+1); }
+  address code_end() const             { return code_base() + code_size(); }
+  bool    contains(address bcp) const  { return code_base() <= bcp
+                                                     && bcp < code_end(); }
+  // Offset to bytecodes
+  static ByteSize codes_offset()
+                            { return in_ByteSize(sizeof(constMethodOopDesc)); }
+
+  // interpreter support
+  static ByteSize exception_table_offset()
+               { return byte_offset_of(constMethodOopDesc, _exception_table); }
+
+  // Garbage collection support
+  oop*  adr_method() const             { return (oop*)&_method;          }
+  oop*  adr_stackmap_data() const      { return (oop*)&_stackmap_data;   }
+  oop*  adr_exception_table() const    { return (oop*)&_exception_table; }
+
+  // Unique id for the method
+  static const u2 MAX_IDNUM;
+  static const u2 UNSET_IDNUM;
+  u2 method_idnum() const                        { return _method_idnum; }
+  void set_method_idnum(u2 idnum)                { _method_idnum = idnum; }
+
+private:
+  // Since the size of the compressed line number table is unknown, the
+  // offsets of the other variable sized sections are computed backwards
+  // from the end of the constMethodOop.
+
+  // First byte after constMethodOop
+  address constMethod_end() const
+                          { return (address)((oop*)this + _constMethod_size); }
+
+  // Last short in constMethodOop
+  u2* last_u2_element() const
+                                         { return (u2*)constMethod_end() - 1; }
+};