jdk8-mips64-public/hotspot: src/share/vm/oops/constMethod.hpp@4735d2c84362 (annotated)

src/share/vm/oops/constMethod.hpp@4735d2c84362 (annotated)

src/share/vm/oops/constMethod.hpp

Thu, 11 Oct 2012 12:25:42 -0400

author: kamg
date: Thu, 11 Oct 2012 12:25:42 -0400
changeset 4245: 4735d2c84362
parent 4037: da91efe96a93
child 4302: b2dbd323c668
permissions: -rw-r--r--

7200776: Implement default methods in interfaces
Summary: Add generic type analysis and default method selection algorithms
Reviewed-by: coleenp, acorn

 /*
  * Copyright (c) 2003, 2012, 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.
  *
  */
 #ifndef SHARE_VM_OOPS_CONSTMETHODOOP_HPP
 #define SHARE_VM_OOPS_CONSTMETHODOOP_HPP
 #include "oops/oop.hpp"
 // An ConstMethod* 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                                        |
 // | constants                      (oop)                 |
 // | stackmap_data                  (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 ConstMethod*)              |
 // |  (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 ConstMethod*)                |
 // |------------------------------------------------------|
 // | exception table + length (length last)               |
 // |  (length is u2, elements are 4-tuples of u2)         |
 // |  (see class ExceptionTableElement)                   |
 // |  (access flags bit tells whether table is present)   |
 // |  (indexed from end of ConstMethod*)                |
 // |------------------------------------------------------|
 // | 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 ConstMethod*)                |
 // |------------------------------------------------------|
 // Utitily class decribing elements in checked exceptions table inlined in Method*.
 class CheckedExceptionElement VALUE_OBJ_CLASS_SPEC {
  public:
   u2 class_cp_index;
 };
 // Utitily class decribing elements in local variable table inlined in Method*.
 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;
 };
 // Utitily class describing elements in exception table
 class ExceptionTableElement VALUE_OBJ_CLASS_SPEC {
  public:
   u2 start_pc;
   u2 end_pc;
   u2 handler_pc;
   u2 catch_type_index;
 };
 class ConstMethod : public MetaspaceObj {
   friend class VMStructs;
 public:
   typedef enum { NORMAL, OVERPASS } MethodType;
 private:
   enum {
     _has_linenumber_table = 1,
     _has_checked_exceptions = 2,
     _has_localvariable_table = 4,
     _has_exception_table = 8,
     _is_overpass = 16
   };
   // 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;
   ConstantPool*     _constants;                  // Constant pool
   // Raw stackmap data for the method
   Array<u1>*        _stackmap_data;
   int               _constMethod_size;
   jbyte             _interpreter_kind;
   jbyte             _flags;
   // Size of Java bytecodes allocated immediately after Method*.
   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)
   // Constructor
   ConstMethod(int byte_code_size,
               int compressed_line_number_size,
               int localvariable_table_length,
               int exception_table_length,
               int checked_exceptions_length,
               MethodType is_overpass,
               int size);
 public:
   static ConstMethod* allocate(ClassLoaderData* loader_data,
                                int byte_code_size,
                                int compressed_line_number_size,
                                int localvariable_table_length,
                                int exception_table_length,
                                int checked_exceptions_length,
                                MethodType mt,
                                TRAPS);
   bool is_constMethod() const { return true; }
   // Inlined tables
   void set_inlined_tables_length(int checked_exceptions_len,
                                  int compressed_line_number_size,
                                  int localvariable_table_len,
                                  int exception_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; }
   bool has_exception_handler() const
     { return (_flags & _has_exception_table) != 0; }
   MethodType method_type() const {
     return ((_flags & _is_overpass) == 0) ? NORMAL : OVERPASS;
   }
   void set_method_type(MethodType mt) {
     if (mt == NORMAL) {
       _flags &= ~(_is_overpass);
     } else {
       _flags |= _is_overpass;
     }
   }
   void set_interpreter_kind(int kind)      { _interpreter_kind = kind; }
   int  interpreter_kind(void) const        { return _interpreter_kind; }
   // constant pool
   ConstantPool* constants() const        { return _constants; }
   void set_constants(ConstantPool* c)    { _constants = c; }
   Method* method() const;
   // stackmap table data
   Array<u1>* stackmap_data() const { return _stackmap_data; }
   void set_stackmap_data(Array<u1>* sd) { _stackmap_data = sd; }
   bool has_stackmap_table() const { return _stackmap_data != NULL; }
   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(ConstMethod)/HeapWordSize;
   }
   // Size needed
   static int size(int code_size, int compressed_line_number_size,
                          int local_variable_table_length,
                          int exception_table_length,
                          int checked_exceptions_length);
   int size() const                    { return _constMethod_size;}
   void set_constMethod_size(int size)     { _constMethod_size = size; }
   // 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;
   u2* exception_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;
   // exception table
   int exception_table_length() const;
   ExceptionTableElement* exception_table_start() const;
   // byte codes
   void    set_code(address code) {
     if (code_size() > 0) {
       memcpy(code_base(), code, code_size());
     }
   }
   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(ConstMethod)); }
   static ByteSize constants_offset()
                             { return byte_offset_of(ConstMethod, _constants); }
   // 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; }
   // Deallocation for RedefineClasses
   void deallocate_contents(ClassLoaderData* loader_data);
   bool is_klass() const { return false; }
   DEBUG_ONLY(bool on_stack() { return false; })
 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 ConstMethod*.
   // First byte after ConstMethod*
   address constMethod_end() const
                           { return (address)((oop*)this + _constMethod_size); }
   // Last short in ConstMethod*
   u2* last_u2_element() const
                                          { return (u2*)constMethod_end() - 1; }
  public:
   // Printing
   void print_on      (outputStream* st) const;
   void print_value_on(outputStream* st) const;
   const char* internal_name() const { return "{constMethod}"; }
   // Verify
   void verify_on(outputStream* st);
 };
 #endif // SHARE_VM_OOPS_CONSTMETHODOOP_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/oops/constMethod.hpp@4735d2c84362 (annotated)

src/share/vm/oops/constMethod.hpp