jdk8-mips64-public/hotspot: src/share/vm/prims/methodHandleWalk.hpp@aa62b9388fce (annotated)

src/share/vm/prims/methodHandleWalk.hpp@aa62b9388fce (annotated)

src/share/vm/prims/methodHandleWalk.hpp

Mon, 04 Jan 2010 15:52:40 +0100

author: twisti
date: Mon, 04 Jan 2010 15:52:40 +0100
changeset 1568: aa62b9388fce
child 1573: dd57230ba8fe
permissions: -rw-r--r--

6894206: JVM needs a way to traverse method handle structures
Summary: We need a way to walk chained method handles in the JVM to call the right methods and to generate required bytecode adapters for the compilers.
Reviewed-by: kvn

 /*
  * Copyright 2008-2010 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.
  *
  */
 // Low-level parser for method handle chains.
 class MethodHandleChain : StackObj {
 public:
   typedef MethodHandles::EntryKind EntryKind;
 private:
   Handle        _root;          // original target
   Handle        _method_handle; // current target
   bool          _is_last;       // final guy in chain
   bool          _is_bound;      // has a bound argument
   BasicType     _arg_type;      // if is_bound, the bound argument type
   int           _arg_slot;      // if is_bound or is_adapter, affected argument slot
   jint          _conversion;    // conversion field of AMH or -1
   methodHandle  _last_method;   // if is_last, which method we target
   Bytecodes::Code _last_invoke; // if is_last, type of invoke
   const char*   _lose_message;  // saved argument to lose()
   void set_method_handle(Handle target, TRAPS);
   void set_last_method(oop target, TRAPS);
   static BasicType compute_bound_arg_type(oop target, methodOop m, int arg_slot, TRAPS);
   oop MethodHandle_type_oop()     { return java_dyn_MethodHandle::type(method_handle_oop()); }
   oop MethodHandle_vmtarget_oop() { return java_dyn_MethodHandle::vmtarget(method_handle_oop()); }
   int MethodHandle_vmslots()      { return java_dyn_MethodHandle::vmslots(method_handle_oop()); }
   int DirectMethodHandle_vmindex()     { return sun_dyn_DirectMethodHandle::vmindex(method_handle_oop()); }
   oop BoundMethodHandle_argument_oop() { return sun_dyn_BoundMethodHandle::argument(method_handle_oop()); }
   int BoundMethodHandle_vmargslot()    { return sun_dyn_BoundMethodHandle::vmargslot(method_handle_oop()); }
   int AdapterMethodHandle_conversion() { return sun_dyn_AdapterMethodHandle::conversion(method_handle_oop()); }
 public:
   MethodHandleChain(Handle root, TRAPS)
     : _root(root)
   { set_method_handle(root, THREAD); }
   bool is_adapter()             { return _conversion != -1; }
   bool is_bound()               { return _is_bound; }
   bool is_last()                { return _is_last; }
   void next(TRAPS) {
     assert(!is_last(), "");
     set_method_handle(MethodHandle_vmtarget_oop(), THREAD);
   }
   Handle method_handle()        { return _method_handle; }
   oop    method_handle_oop()    { return _method_handle(); }
   oop    method_type_oop()      { return MethodHandle_type_oop(); }
   jint adapter_conversion()     { assert(is_adapter(), ""); return _conversion; }
   int  adapter_conversion_op()  { return MethodHandles::adapter_conversion_op(adapter_conversion()); }
   BasicType adapter_conversion_src_type()
                                 { return MethodHandles::adapter_conversion_src_type(adapter_conversion()); }
   BasicType adapter_conversion_dest_type()
                                 { return MethodHandles::adapter_conversion_dest_type(adapter_conversion()); }
   int  adapter_conversion_stack_move()
                                 { return MethodHandles::adapter_conversion_stack_move(adapter_conversion()); }
   int  adapter_conversion_stack_pushes()
                                 { return adapter_conversion_stack_move() / MethodHandles::stack_move_unit(); }
   int  adapter_conversion_vminfo()
                                 { return MethodHandles::adapter_conversion_vminfo(adapter_conversion()); }
   int adapter_arg_slot()        { assert(is_adapter(), ""); return _arg_slot; }
   oop adapter_arg_oop()         { assert(is_adapter(), ""); return BoundMethodHandle_argument_oop(); }
   BasicType bound_arg_type()    { assert(is_bound(), ""); return _arg_type; }
   int       bound_arg_slot()    { assert(is_bound(), ""); return _arg_slot; }
   oop       bound_arg_oop()     { assert(is_bound(), ""); return BoundMethodHandle_argument_oop(); }
   methodOop last_method_oop()   { assert(is_last(), ""); return _last_method(); }
   Bytecodes::Code last_invoke_code() { assert(is_last(), ""); return _last_invoke; }
   void lose(const char* msg, TRAPS);
   const char* lose_message()    { return _lose_message; }
 };
 // Structure walker for method handles.
 // Does abstract interpretation on top of low-level parsing.
 // You supply the tokens shuffled by the abstract interpretation.
 class MethodHandleWalker : StackObj {
 public:
   struct _ArgToken { };  // dummy struct
   typedef _ArgToken* ArgToken;
   // Abstract interpretation state:
   struct SlotState {
     BasicType _type;
     ArgToken  _arg;
     SlotState() : _type(), _arg() {}
   };
   static SlotState make_state(BasicType type, ArgToken arg) {
     SlotState ss;
     ss._type = type; ss._arg = arg;
     return ss;
   }
 private:
   MethodHandleChain _chain;
   GrowableArray<SlotState> _outgoing;  // current outgoing parameter slots
   int                      _outgoing_argc;  // # non-empty outgoing slots
   // Replace a value of type old_type at slot (and maybe slot+1) with the new value.
   // If old_type != T_VOID, remove the old argument at that point.
   // If new_type != T_VOID, insert the new argument at that point.
   // Insert or delete a second empty slot as needed.
   void change_argument(BasicType old_type, int slot, BasicType new_type, ArgToken new_arg);
   SlotState* slot_state(int slot) {
     if (slot < 0 || slot >= _outgoing.length())
       return NULL;
     return _outgoing.adr_at(slot);
   }
   BasicType slot_type(int slot) {
     SlotState* ss = slot_state(slot);
     if (ss == NULL)
       return T_ILLEGAL;
     return ss->_type;
   }
   bool slot_has_argument(int slot) {
     return slot_type(slot) < T_VOID;
   }
 #ifdef ASSERT
   int argument_count_slow();
 #endif
   // Return a bytecode for converting src to dest, if one exists.
   Bytecodes::Code conversion_code(BasicType src, BasicType dest);
   void walk_incoming_state(TRAPS);
 public:
   MethodHandleWalker(Handle root, TRAPS)
     : _chain(root, THREAD),
       _outgoing(THREAD, 10),
       _outgoing_argc(0)
   { }
   MethodHandleChain& chain() { return _chain; }
   // plug-in abstract interpretation steps:
   virtual ArgToken make_parameter( BasicType type, klassOop tk, int argnum, TRAPS ) = 0;
   virtual ArgToken make_prim_constant( BasicType type, jvalue* con, TRAPS ) = 0;
   virtual ArgToken make_oop_constant( oop con, TRAPS ) = 0;
   virtual ArgToken make_conversion( BasicType type, klassOop tk, Bytecodes::Code op, ArgToken src, TRAPS ) = 0;
   virtual ArgToken make_fetch( BasicType type, klassOop tk, Bytecodes::Code op, ArgToken base, ArgToken offset, TRAPS ) = 0;
   virtual ArgToken make_invoke( methodOop m, vmIntrinsics::ID iid, Bytecodes::Code op, bool tailcall, int argc, ArgToken* argv, TRAPS ) = 0;
   // For make_invoke, the methodOop can be NULL if the intrinsic ID
   // is something other than vmIntrinsics::_none.
   // and in case anyone cares to related the previous actions to the chain:
   virtual void set_method_handle(oop mh) { }
   void lose(const char* msg, TRAPS) { chain().lose(msg, THREAD); }
   const char* lose_message()        { return chain().lose_message(); }
   ArgToken walk(TRAPS);
 };
 // An abstract interpreter for method handle chains.
 // Produces an account of the semantics of a chain, in terms of a static IR.
 // The IR happens to be JVM bytecodes.
 class MethodHandleCompiler : public MethodHandleWalker {
 private:
   Thread* _thread;
   struct PrimCon {
     BasicType _type;
     jvalue    _value;
   };
   // Accumulated compiler state:
   stringStream _bytes;
   GrowableArray<Handle>   _constant_oops;
   GrowableArray<PrimCon*> _constant_prims;
   int _max_stack;
   int _num_params;
   int _max_locals;
   int _name_index;
   int _signature_index;
   // Stack values:
   enum TokenType {
     tt_void,
     tt_parameter,
     tt_temporary,
     tt_constant
   };
   ArgToken make_stack_value(TokenType tt, BasicType type, int id) {
     return ArgToken( ((intptr_t)id << 8) | ((intptr_t)type << 4) | (intptr_t)tt );
   }
 public:
   virtual ArgToken make_parameter(BasicType type, klassOop tk, int argnum, TRAPS) {
     return make_stack_value(tt_parameter, type, argnum);
   }
   virtual ArgToken make_oop_constant(oop con, TRAPS) {
     return make_stack_value(tt_constant, T_OBJECT, find_oop_constant(con));
   }
   virtual ArgToken make_prim_constant(BasicType type, jvalue* con, TRAPS) {
     return make_stack_value(tt_constant, type, find_prim_constant(type, con));
   }
   virtual ArgToken make_conversion(BasicType type, klassOop tk, Bytecodes::Code op, ArgToken src, TRAPS);
   virtual ArgToken make_fetch(BasicType type, klassOop tk, Bytecodes::Code op, ArgToken base, ArgToken offset, TRAPS);
   virtual ArgToken make_invoke(methodOop m, vmIntrinsics::ID iid, Bytecodes::Code op, bool tailcall, int argc, ArgToken* argv, TRAPS);
   int find_oop_constant(oop con);
   int find_prim_constant(BasicType type, jvalue* con);
 public:
   MethodHandleCompiler(Handle root, TRAPS)
     : MethodHandleWalker(root, THREAD),
       _thread(THREAD),
       _bytes(50),
       _constant_oops(THREAD, 10),
       _constant_prims(THREAD, 10),
       _max_stack(0), _max_locals(0),
       _name_index(0), _signature_index(0)
   { }
   const char* bytes()         { return _bytes.as_string(); }
   int constant_length()       { return _constant_oops.length(); }
   int max_stack()             { return _max_stack; }
   int max_locals()            { return _max_locals; }
   int name_index()            { return _name_index; }
   int signature_index()       { return _signature_index; }
   symbolHandle name()         { return symbolHandle(_thread, (symbolOop)constant_oop_at(_name_index)()); }
   symbolHandle signature()    { return symbolHandle(_thread, (symbolOop)constant_oop_at(_signature_index)()); }
   bool constant_is_oop_at(int i) {
     return (_constant_prims.at(i) == NULL);
   }
   Handle constant_oop_at(int i) {
     assert(constant_is_oop_at(i), "");
     return _constant_oops.at(i);
   }
   PrimCon* constant_prim_at(int i) {
     assert(!constant_is_oop_at(i), "");
     return _constant_prims.at(i);
   }
   // Compile the given MH chain into bytecode.
   void compile(TRAPS);
 };

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/prims/methodHandleWalk.hpp@aa62b9388fce (annotated)

src/share/vm/prims/methodHandleWalk.hpp