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 /*

  * Copyright (c) 1997, 2011, 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_INTERPRETER_BYTECODE_HPP

 #define SHARE_VM_INTERPRETER_BYTECODE_HPP

 #include "interpreter/bytecodes.hpp"

 #include "memory/allocation.hpp"

 #include "oops/methodOop.hpp"

 #ifdef TARGET_ARCH_x86

 # include "bytes_x86.hpp"

 #endif

 #ifdef TARGET_ARCH_sparc

 # include "bytes_sparc.hpp"

 #endif

 #ifdef TARGET_ARCH_zero

 # include "bytes_zero.hpp"

 #endif

 class ciBytecodeStream;

 // The base class for different kinds of bytecode abstractions.

 // Provides the primitive operations to manipulate code relative

 // to the bcp.

 class Bytecode: public StackObj {

  protected:

   const address   _bcp;

   const Bytecodes::Code _code;

   // Address computation

   address addr_at            (int offset)        const     { return (address)_bcp + offset; }

   u_char byte_at(int offset) const               { return *addr_at(offset); }

   address aligned_addr_at    (int offset)        const     { return (address)round_to((intptr_t)addr_at(offset), jintSize); }

   int     aligned_offset     (int offset)        const     { return aligned_addr_at(offset) - addr_at(0); }

   // Word access:

   int     get_Java_u2_at     (int offset)        const     { return Bytes::get_Java_u2(addr_at(offset)); }

   int     get_Java_u4_at     (int offset)        const     { return Bytes::get_Java_u4(addr_at(offset)); }

   int     get_native_u2_at   (int offset)        const     { return Bytes::get_native_u2(addr_at(offset)); }

   int     get_native_u4_at   (int offset)        const     { return Bytes::get_native_u4(addr_at(offset)); }

  public:

   Bytecode(methodOop method, address bcp): _bcp(bcp), _code(Bytecodes::code_at(method, addr_at(0))) {

     assert(method != NULL, "this form requires a valid methodOop");

   }

   // Defined in ciStreams.hpp

   inline Bytecode(const ciBytecodeStream* stream, address bcp = NULL);

   // Attributes

   address bcp() const                            { return _bcp; }

   int instruction_size() const                   { return Bytecodes::length_for_code_at(_code, bcp()); }

   Bytecodes::Code code() const                   { return _code; }

   Bytecodes::Code java_code() const              { return Bytecodes::java_code(code()); }

   // Static functions for parsing bytecodes in place.

   int get_index_u1(Bytecodes::Code bc) const {

     assert_same_format_as(bc); assert_index_size(1, bc);

     return *(jubyte*)addr_at(1);

   }

   int get_index_u2(Bytecodes::Code bc, bool is_wide = false) const {

     assert_same_format_as(bc, is_wide); assert_index_size(2, bc, is_wide);

     address p = addr_at(is_wide ? 2 : 1);

     if (can_use_native_byte_order(bc, is_wide))

       return Bytes::get_native_u2(p);

     else  return Bytes::get_Java_u2(p);

   }

   int get_index_u1_cpcache(Bytecodes::Code bc) const {

     assert_same_format_as(bc); assert_index_size(1, bc);

     return *(jubyte*)addr_at(1) + constantPoolOopDesc::CPCACHE_INDEX_TAG;

   }

   int get_index_u2_cpcache(Bytecodes::Code bc) const {

     assert_same_format_as(bc); assert_index_size(2, bc); assert_native_index(bc);

     return Bytes::get_native_u2(addr_at(1)) + constantPoolOopDesc::CPCACHE_INDEX_TAG;

   }

   int get_index_u4(Bytecodes::Code bc) const {

     assert_same_format_as(bc); assert_index_size(4, bc);

     assert(can_use_native_byte_order(bc), "");

     return Bytes::get_native_u4(addr_at(1));

   }

   bool has_index_u4(Bytecodes::Code bc) const {

     return bc == Bytecodes::_invokedynamic;

   }

   int get_offset_s2(Bytecodes::Code bc) const {

     assert_same_format_as(bc); assert_offset_size(2, bc);

     return (jshort) Bytes::get_Java_u2(addr_at(1));

   }

   int get_offset_s4(Bytecodes::Code bc) const {

     assert_same_format_as(bc); assert_offset_size(4, bc);

     return (jint) Bytes::get_Java_u4(addr_at(1));

   }

   int get_constant_u1(int offset, Bytecodes::Code bc) const {

     assert_same_format_as(bc); assert_constant_size(1, offset, bc);

     return *(jbyte*)addr_at(offset);

   }

   int get_constant_u2(int offset, Bytecodes::Code bc, bool is_wide = false) const {

     assert_same_format_as(bc, is_wide); assert_constant_size(2, offset, bc, is_wide);

     return (jshort) Bytes::get_Java_u2(addr_at(offset));

   }

   // These are used locally and also from bytecode streams.

   void assert_same_format_as(Bytecodes::Code testbc, bool is_wide = false) const NOT_DEBUG_RETURN;

   static void assert_index_size(int required_size, Bytecodes::Code bc, bool is_wide = false) NOT_DEBUG_RETURN;

   static void assert_offset_size(int required_size, Bytecodes::Code bc, bool is_wide = false) NOT_DEBUG_RETURN;

   static void assert_constant_size(int required_size, int where, Bytecodes::Code bc, bool is_wide = false) NOT_DEBUG_RETURN;

   static void assert_native_index(Bytecodes::Code bc, bool is_wide = false) NOT_DEBUG_RETURN;

   static bool can_use_native_byte_order(Bytecodes::Code bc, bool is_wide = false) {

     return (!Bytes::is_Java_byte_ordering_different() || Bytecodes::native_byte_order(bc /*, is_wide*/));

   }

 };

 // Abstractions for lookupswitch bytecode

 class LookupswitchPair VALUE_OBJ_CLASS_SPEC {

  private:

   const address _bcp;

   address addr_at            (int offset)        const     { return _bcp + offset; }

   int     get_Java_u4_at     (int offset)        const     { return Bytes::get_Java_u4(addr_at(offset)); }

  public:

   LookupswitchPair(address bcp): _bcp(bcp) {}

   int  match() const                             { return get_Java_u4_at(0 * jintSize); }

   int  offset() const                            { return get_Java_u4_at(1 * jintSize); }

 };

 class Bytecode_lookupswitch: public Bytecode {

  public:

   Bytecode_lookupswitch(methodOop method, address bcp): Bytecode(method, bcp) { verify(); }

   // Defined in ciStreams.hpp

   inline Bytecode_lookupswitch(const ciBytecodeStream* stream);

   void verify() const PRODUCT_RETURN;

   // Attributes

   int  default_offset() const                    { return get_Java_u4_at(aligned_offset(1 + 0*jintSize)); }

   int  number_of_pairs() const                   { return get_Java_u4_at(aligned_offset(1 + 1*jintSize)); }

   LookupswitchPair pair_at(int i) const          {

     assert(0 <= i && i < number_of_pairs(), "pair index out of bounds");

     return LookupswitchPair(aligned_addr_at(1 + (1 + i)*2*jintSize));

   }

 };

 class Bytecode_tableswitch: public Bytecode {

  public:

   Bytecode_tableswitch(methodOop method, address bcp): Bytecode(method, bcp) { verify(); }

   // Defined in ciStreams.hpp

   inline Bytecode_tableswitch(const ciBytecodeStream* stream);

   void verify() const PRODUCT_RETURN;

   // Attributes

   int  default_offset() const                    { return get_Java_u4_at(aligned_offset(1 + 0*jintSize)); }

   int  low_key() const                           { return get_Java_u4_at(aligned_offset(1 + 1*jintSize)); }

   int  high_key() const                          { return get_Java_u4_at(aligned_offset(1 + 2*jintSize)); }

   int  dest_offset_at(int i) const;

   int  length()                                  { return high_key()-low_key()+1; }

 };

 // Common code for decoding invokes and field references.

 class Bytecode_member_ref: public Bytecode {

  protected:

   const methodHandle _method;                          // method containing the bytecode

   Bytecode_member_ref(methodHandle method, int bci)  : Bytecode(method(), method()->bcp_from(bci)), _method(method) {}

   methodHandle method() const                    { return _method; }

  public:

   int          index() const;                    // cache index (loaded from instruction)

   int          pool_index() const;               // constant pool index

   symbolOop    name() const;                     // returns the name of the method or field

   symbolOop    signature() const;                // returns the signature of the method or field

   BasicType    result_type(Thread* thread) const; // returns the result type of the getfield or invoke

 };

 // Abstraction for invoke_{virtual, static, interface, special}

 class Bytecode_invoke: public Bytecode_member_ref {

  protected:

   // Constructor that skips verification

   Bytecode_invoke(methodHandle method, int bci, bool unused)  : Bytecode_member_ref(method, bci) {}

  public:

   Bytecode_invoke(methodHandle method, int bci)  : Bytecode_member_ref(method, bci) { verify(); }

   void verify() const;

   // Attributes

   methodHandle static_target(TRAPS);             // "specified" method   (from constant pool)

   // Testers

   bool is_invokeinterface() const                { return java_code() == Bytecodes::_invokeinterface; }

   bool is_invokevirtual() const                  { return java_code() == Bytecodes::_invokevirtual; }

   bool is_invokestatic() const                   { return java_code() == Bytecodes::_invokestatic; }

   bool is_invokespecial() const                  { return java_code() == Bytecodes::_invokespecial; }

   bool is_invokedynamic() const                  { return java_code() == Bytecodes::_invokedynamic; }

   bool has_receiver() const                      { return !is_invokestatic() && !is_invokedynamic(); }

   bool is_valid() const                          { return is_invokeinterface() ||

                                                           is_invokevirtual()   ||

                                                           is_invokestatic()    ||

                                                           is_invokespecial()   ||

                                                           is_invokedynamic(); }

   // Helper to skip verification.   Used is_valid() to check if the result is really an invoke

   inline friend Bytecode_invoke Bytecode_invoke_check(methodHandle method, int bci);

 };

 inline Bytecode_invoke Bytecode_invoke_check(methodHandle method, int bci) {

   return Bytecode_invoke(method, bci, false);

 }

 // Abstraction for all field accesses (put/get field/static)

 class Bytecode_field: public Bytecode_member_ref {

  public:

   Bytecode_field(methodHandle method, int bci)  : Bytecode_member_ref(method, bci) { verify(); }

   // Testers

   bool is_getfield() const                       { return java_code() == Bytecodes::_getfield; }

   bool is_putfield() const                       { return java_code() == Bytecodes::_putfield; }

   bool is_getstatic() const                      { return java_code() == Bytecodes::_getstatic; }

   bool is_putstatic() const                      { return java_code() == Bytecodes::_putstatic; }

   bool is_getter() const                         { return is_getfield()  || is_getstatic(); }

   bool is_static() const                         { return is_getstatic() || is_putstatic(); }

   bool is_valid() const                          { return is_getfield()   ||

                                                           is_putfield()   ||

                                                           is_getstatic()  ||

                                                           is_putstatic(); }

   void verify() const;

 };

 // Abstraction for checkcast

 class Bytecode_checkcast: public Bytecode {

  public:

   Bytecode_checkcast(methodOop method, address bcp): Bytecode(method, bcp) { verify(); }

   void verify() const { assert(Bytecodes::java_code(code()) == Bytecodes::_checkcast, "check checkcast"); }

   // Returns index

   long index() const   { return get_index_u2(Bytecodes::_checkcast); };

 };

 // Abstraction for instanceof

 class Bytecode_instanceof: public Bytecode {

  public:

   Bytecode_instanceof(methodOop method, address bcp): Bytecode(method, bcp) { verify(); }

   void verify() const { assert(code() == Bytecodes::_instanceof, "check instanceof"); }

   // Returns index

   long index() const   { return get_index_u2(Bytecodes::_instanceof); };

 };

 class Bytecode_new: public Bytecode {

  public:

   Bytecode_new(methodOop method, address bcp): Bytecode(method, bcp) { verify(); }

   void verify() const { assert(java_code() == Bytecodes::_new, "check new"); }

   // Returns index

   long index() const   { return get_index_u2(Bytecodes::_new); };

 };

 class Bytecode_multianewarray: public Bytecode {

  public:

   Bytecode_multianewarray(methodOop method, address bcp): Bytecode(method, bcp) { verify(); }

   void verify() const { assert(java_code() == Bytecodes::_multianewarray, "check new"); }

   // Returns index

   long index() const   { return get_index_u2(Bytecodes::_multianewarray); };

 };

 class Bytecode_anewarray: public Bytecode {

  public:

   Bytecode_anewarray(methodOop method, address bcp): Bytecode(method, bcp) { verify(); }

   void verify() const { assert(java_code() == Bytecodes::_anewarray, "check anewarray"); }

   // Returns index

   long index() const   { return get_index_u2(Bytecodes::_anewarray); };

 };

 // Abstraction for ldc, ldc_w and ldc2_w

 class Bytecode_loadconstant: public Bytecode {

  private:

   const methodHandle _method;

   int raw_index() const;

  public:

   Bytecode_loadconstant(methodHandle method, int bci): Bytecode(method(), method->bcp_from(bci)), _method(method) { verify(); }

   void verify() const {

     assert(_method.not_null(), "must supply method");

     Bytecodes::Code stdc = Bytecodes::java_code(code());

     assert(stdc == Bytecodes::_ldc ||

            stdc == Bytecodes::_ldc_w ||

            stdc == Bytecodes::_ldc2_w, "load constant");

   }

   // Only non-standard bytecodes (fast_aldc) have CP cache indexes.

   bool has_cache_index() const { return code() >= Bytecodes::number_of_java_codes; }

   int pool_index() const;               // index into constant pool

   int cache_index() const {             // index into CP cache (or -1 if none)

     return has_cache_index() ? raw_index() : -1;

   }

   BasicType result_type() const;        // returns the result type of the ldc

   oop resolve_constant(TRAPS) const;

 };

 #endif // SHARE_VM_INTERPRETER_BYTECODE_HPP