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 /*

  * Copyright (c) 2008, 2010, 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

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 #ifndef SHARE_VM_PRIMS_METHODHANDLEWALK_HPP

 #define SHARE_VM_PRIMS_METHODHANDLEWALK_HPP

 #include "prims/methodHandles.hpp"

 // 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(); }

   oop    vmtarget_oop()         { return MethodHandle_vmtarget_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:

   // Stack values:

   enum TokenType {

     tt_void,

     tt_parameter,

     tt_temporary,

     tt_constant,

     tt_illegal

   };

   // Argument token:

   class ArgToken {

   private:

     TokenType _tt;

     BasicType _bt;

     jvalue    _value;

     Handle    _handle;

   public:

     ArgToken(TokenType tt = tt_illegal) : _tt(tt) {}

     ArgToken(TokenType tt, BasicType bt, jvalue value) : _tt(tt), _bt(bt), _value(value) {}

     ArgToken(TokenType tt, BasicType bt, int index) : _tt(tt), _bt(bt) {

       _value.i = index;

     }

     ArgToken(TokenType tt, BasicType bt, Handle value) : _tt(tt), _bt(bt) {

       _handle = value;

     }

     TokenType token_type()  const { return _tt; }

     BasicType basic_type()  const { return _bt; }

     int       index()       const { return _value.i; }

     Handle    object()      const { return _handle; }

     jint      get_jint()    const { return _value.i; }

     jlong     get_jlong()   const { return _value.j; }

     jfloat    get_jfloat()  const { return _value.f; }

     jdouble   get_jdouble() const { return _value.d; }

   };

   // 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;

   bool              _for_invokedynamic;

   int               _local_index;

   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, const 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, bool for_invokedynamic, TRAPS)

     : _chain(root, THREAD),

       _for_invokedynamic(for_invokedynamic),

       _outgoing(THREAD, 10),

       _outgoing_argc(0)

   {

     _local_index = for_invokedynamic ? 0 : 1;

   }

   MethodHandleChain& chain() { return _chain; }

   bool for_invokedynamic() const { return _for_invokedynamic; }

   int new_local_index(BasicType bt) {

     //int index = _for_invokedynamic ? _local_index : _local_index - 1;

     int index = _local_index;

     _local_index += type2size[bt];

     return index;

   }

   int max_locals() const { return _local_index; }

   // 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, const ArgToken& src, TRAPS ) = 0;

   virtual ArgToken make_fetch( BasicType type, klassOop tk, Bytecodes::Code op, const ArgToken& base, const 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:

   methodHandle _callee;

   KlassHandle  _rklass;        // Return type for casting.

   BasicType    _rtype;

   KlassHandle  _target_klass;

   Thread*      _thread;

   // Fake constant pool entry.

   class ConstantValue {

   private:

     int       _tag;   // Constant pool tag type.

     JavaValue _value;

     Handle    _handle;

     Symbol*   _sym;

   public:

     // Constructor for oop types.

     ConstantValue(int tag, Handle con) : _tag(tag), _handle(con) {

       assert(tag == JVM_CONSTANT_Class  ||

              tag == JVM_CONSTANT_String ||

              tag == JVM_CONSTANT_Object, "must be oop type");

     }

     ConstantValue(int tag, Symbol* con) : _tag(tag), _sym(con) {

       assert(tag == JVM_CONSTANT_Utf8, "must be symbol type");

     }

     // Constructor for oop reference types.

     ConstantValue(int tag, int index) : _tag(tag) {

       assert(JVM_CONSTANT_Fieldref <= tag && tag <= JVM_CONSTANT_NameAndType, "must be ref type");

       _value.set_jint(index);

     }

     ConstantValue(int tag, int first_index, int second_index) : _tag(tag) {

       assert(JVM_CONSTANT_Fieldref <= tag && tag <= JVM_CONSTANT_NameAndType, "must be ref type");

       _value.set_jint(first_index << 16 | second_index);

     }

     // Constructor for primitive types.

     ConstantValue(BasicType bt, jvalue con) {

       _value.set_type(bt);

       switch (bt) {

       case T_INT:    _tag = JVM_CONSTANT_Integer; _value.set_jint(   con.i); break;

       case T_LONG:   _tag = JVM_CONSTANT_Long;    _value.set_jlong(  con.j); break;

       case T_FLOAT:  _tag = JVM_CONSTANT_Float;   _value.set_jfloat( con.f); break;

       case T_DOUBLE: _tag = JVM_CONSTANT_Double;  _value.set_jdouble(con.d); break;

       default: ShouldNotReachHere();

       }

     }

     int       tag()          const { return _tag; }

     Symbol*   symbol()       const { return _sym; }

     klassOop  klass_oop()    const { return (klassOop)  _handle(); }

     oop       object_oop()   const { return _handle(); }

     int       index()        const { return _value.get_jint(); }

     int       first_index()  const { return _value.get_jint() >> 16; }

     int       second_index() const { return _value.get_jint() & 0x0000FFFF; }

     bool      is_primitive() const { return is_java_primitive(_value.get_type()); }

     jint      get_jint()     const { return _value.get_jint();    }

     jlong     get_jlong()    const { return _value.get_jlong();   }

     jfloat    get_jfloat()   const { return _value.get_jfloat();  }

     jdouble   get_jdouble()  const { return _value.get_jdouble(); }

   };

   // Fake constant pool.

   GrowableArray<ConstantValue*> _constants;

   // Accumulated compiler state:

   GrowableArray<unsigned char> _bytecode;

   int _cur_stack;

   int _max_stack;

   int _num_params;

   int _name_index;

   int _signature_index;

   void stack_push(BasicType bt) {

     _cur_stack += type2size[bt];

     if (_cur_stack > _max_stack) _max_stack = _cur_stack;

   }

   void stack_pop(BasicType bt) {

     _cur_stack -= type2size[bt];

     assert(_cur_stack >= 0, "sanity");

   }

   unsigned char* bytecode()        const { return _bytecode.adr_at(0); }

   int            bytecode_length() const { return _bytecode.length(); }

   // Fake constant pool.

   int cpool_oop_put(int tag, Handle con) {

     if (con.is_null())  return 0;

     ConstantValue* cv = new ConstantValue(tag, con);

     return _constants.append(cv);

   }

   int cpool_symbol_put(int tag, Symbol* con) {

     if (con == NULL)  return 0;

     ConstantValue* cv = new ConstantValue(tag, con);

     return _constants.append(cv);

   }

   int cpool_oop_reference_put(int tag, int first_index, int second_index) {

     if (first_index == 0 && second_index == 0)  return 0;

     assert(first_index != 0 && second_index != 0, "no zero indexes");

     ConstantValue* cv = new ConstantValue(tag, first_index, second_index);

     return _constants.append(cv);

   }

   int cpool_primitive_put(BasicType type, jvalue* con);

   int cpool_int_put(jint value) {

     jvalue con; con.i = value;

     return cpool_primitive_put(T_INT, &con);

   }

   int cpool_long_put(jlong value) {

     jvalue con; con.j = value;

     return cpool_primitive_put(T_LONG, &con);

   }

   int cpool_float_put(jfloat value) {

     jvalue con; con.f = value;

     return cpool_primitive_put(T_FLOAT, &con);

   }

   int cpool_double_put(jdouble value) {

     jvalue con; con.d = value;

     return cpool_primitive_put(T_DOUBLE, &con);

   }

   int cpool_object_put(Handle obj) {

     return cpool_oop_put(JVM_CONSTANT_Object, obj);

   }

   int cpool_symbol_put(Symbol* sym) {

     return cpool_symbol_put(JVM_CONSTANT_Utf8, sym);

   }

   int cpool_klass_put(klassOop klass) {

     return cpool_oop_put(JVM_CONSTANT_Class, klass);

   }

   int cpool_methodref_put(int class_index, int name_and_type_index) {

     return cpool_oop_reference_put(JVM_CONSTANT_Methodref, class_index, name_and_type_index);

   }

   int cpool_name_and_type_put(int name_index, int signature_index) {

     return cpool_oop_reference_put(JVM_CONSTANT_NameAndType, name_index, signature_index);

   }

   void emit_bc(Bytecodes::Code op, int index = 0);

   void emit_load(BasicType bt, int index);

   void emit_store(BasicType bt, int index);

   void emit_load_constant(ArgToken arg);

   virtual ArgToken make_parameter(BasicType type, klassOop tk, int argnum, TRAPS) {

     return ArgToken(tt_parameter, type, argnum);

   }

   virtual ArgToken make_oop_constant(oop con, TRAPS) {

     Handle h(THREAD, con);

     return ArgToken(tt_constant, T_OBJECT, h);

   }

   virtual ArgToken make_prim_constant(BasicType type, jvalue* con, TRAPS) {

     return ArgToken(tt_constant, type, *con);

   }

   virtual ArgToken make_conversion(BasicType type, klassOop tk, Bytecodes::Code op, const ArgToken& src, TRAPS);

   virtual ArgToken make_fetch(BasicType type, klassOop tk, Bytecodes::Code op, const ArgToken& base, const ArgToken& offset, TRAPS);

   virtual ArgToken make_invoke(methodOop m, vmIntrinsics::ID iid, Bytecodes::Code op, bool tailcall, int argc, ArgToken* argv, TRAPS);

   // Get a real constant pool.

   constantPoolHandle get_constant_pool(TRAPS) const;

   // Get a real methodOop.

   methodHandle get_method_oop(TRAPS) const;

 public:

   MethodHandleCompiler(Handle root, methodHandle call_method, bool for_invokedynamic, TRAPS);

   // Compile the given MH chain into bytecode.

   methodHandle compile(TRAPS);

   // Tests if the given class is a MH adapter holder.

   static bool klass_is_method_handle_adapter_holder(klassOop klass) {

     return (klass == SystemDictionary::MethodHandle_klass());

   }

 };

 #endif // SHARE_VM_PRIMS_METHODHANDLEWALK_HPP