Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright 2003-2007 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.

  *

  */

 class BiasedLockingCounters;

 // Contains all the definitions needed for amd64 assembly code generation.

 #ifdef _LP64

 // Calling convention

 class Argument VALUE_OBJ_CLASS_SPEC {

  public:

   enum {

 #ifdef _WIN64

     n_int_register_parameters_c   = 4, // rcx, rdx, r8, r9 (c_rarg0, c_rarg1, ...)

     n_float_register_parameters_c = 4,  // xmm0 - xmm3 (c_farg0, c_farg1, ... )

 #else

     n_int_register_parameters_c   = 6, // rdi, rsi, rdx, rcx, r8, r9 (c_rarg0, c_rarg1, ...)

     n_float_register_parameters_c = 8,  // xmm0 - xmm7 (c_farg0, c_farg1, ... )

 #endif  // _WIN64

     n_int_register_parameters_j   = 6, // j_rarg0, j_rarg1, ...

     n_float_register_parameters_j = 8  // j_farg0, j_farg1, ...

   };

 };

 // Symbolically name the register arguments used by the c calling convention.

 // Windows is different from linux/solaris. So much for standards...

 #ifdef _WIN64

 REGISTER_DECLARATION(Register, c_rarg0, rcx);

 REGISTER_DECLARATION(Register, c_rarg1, rdx);

 REGISTER_DECLARATION(Register, c_rarg2, r8);

 REGISTER_DECLARATION(Register, c_rarg3, r9);

 REGISTER_DECLARATION(XMMRegister, c_farg0, xmm0);

 REGISTER_DECLARATION(XMMRegister, c_farg1, xmm1);

 REGISTER_DECLARATION(XMMRegister, c_farg2, xmm2);

 REGISTER_DECLARATION(XMMRegister, c_farg3, xmm3);

 #else

 REGISTER_DECLARATION(Register, c_rarg0, rdi);

 REGISTER_DECLARATION(Register, c_rarg1, rsi);

 REGISTER_DECLARATION(Register, c_rarg2, rdx);

 REGISTER_DECLARATION(Register, c_rarg3, rcx);

 REGISTER_DECLARATION(Register, c_rarg4, r8);

 REGISTER_DECLARATION(Register, c_rarg5, r9);

 REGISTER_DECLARATION(XMMRegister, c_farg0, xmm0);

 REGISTER_DECLARATION(XMMRegister, c_farg1, xmm1);

 REGISTER_DECLARATION(XMMRegister, c_farg2, xmm2);

 REGISTER_DECLARATION(XMMRegister, c_farg3, xmm3);

 REGISTER_DECLARATION(XMMRegister, c_farg4, xmm4);

 REGISTER_DECLARATION(XMMRegister, c_farg5, xmm5);

 REGISTER_DECLARATION(XMMRegister, c_farg6, xmm6);

 REGISTER_DECLARATION(XMMRegister, c_farg7, xmm7);

 #endif  // _WIN64

 // Symbolically name the register arguments used by the Java calling convention.

 // We have control over the convention for java so we can do what we please.

 // What pleases us is to offset the java calling convention so that when

 // we call a suitable jni method the arguments are lined up and we don't

 // have to do little shuffling. A suitable jni method is non-static and a

 // small number of arguments (two fewer args on windows)

 //

 //        |-------------------------------------------------------|

 //        | c_rarg0   c_rarg1  c_rarg2 c_rarg3 c_rarg4 c_rarg5    |

 //        |-------------------------------------------------------|

 //        | rcx       rdx      r8      r9      rdi*    rsi*       | windows (* not a c_rarg)

 //        | rdi       rsi      rdx     rcx     r8      r9         | solaris/linux

 //        |-------------------------------------------------------|

 //        | j_rarg5   j_rarg0  j_rarg1 j_rarg2 j_rarg3 j_rarg4    |

 //        |-------------------------------------------------------|

 REGISTER_DECLARATION(Register, j_rarg0, c_rarg1);

 REGISTER_DECLARATION(Register, j_rarg1, c_rarg2);

 REGISTER_DECLARATION(Register, j_rarg2, c_rarg3);

 // Windows runs out of register args here

 #ifdef _WIN64

 REGISTER_DECLARATION(Register, j_rarg3, rdi);

 REGISTER_DECLARATION(Register, j_rarg4, rsi);

 #else

 REGISTER_DECLARATION(Register, j_rarg3, c_rarg4);

 REGISTER_DECLARATION(Register, j_rarg4, c_rarg5);

 #endif // _WIN64

 REGISTER_DECLARATION(Register, j_rarg5, c_rarg0);

 REGISTER_DECLARATION(XMMRegister, j_farg0, xmm0);

 REGISTER_DECLARATION(XMMRegister, j_farg1, xmm1);

 REGISTER_DECLARATION(XMMRegister, j_farg2, xmm2);

 REGISTER_DECLARATION(XMMRegister, j_farg3, xmm3);

 REGISTER_DECLARATION(XMMRegister, j_farg4, xmm4);

 REGISTER_DECLARATION(XMMRegister, j_farg5, xmm5);

 REGISTER_DECLARATION(XMMRegister, j_farg6, xmm6);

 REGISTER_DECLARATION(XMMRegister, j_farg7, xmm7);

 REGISTER_DECLARATION(Register, rscratch1, r10);  // volatile

 REGISTER_DECLARATION(Register, rscratch2, r11);  // volatile

 REGISTER_DECLARATION(Register, r12_heapbase, r12); // callee-saved

 REGISTER_DECLARATION(Register, r15_thread, r15);   // callee-saved

 #endif // _LP64

 // Address is an abstraction used to represent a memory location

 // using any of the amd64 addressing modes with one object.

 //

 // Note: A register location is represented via a Register, not

 //       via an address for efficiency & simplicity reasons.

 class ArrayAddress;

 class Address VALUE_OBJ_CLASS_SPEC {

  public:

   enum ScaleFactor {

     no_scale = -1,

     times_1  =  0,

     times_2  =  1,

     times_4  =  2,

     times_8  =  3

   };

  private:

   Register         _base;

   Register         _index;

   ScaleFactor      _scale;

   int              _disp;

   RelocationHolder _rspec;

   // Easily misused constructors make them private

   Address(int disp, address loc, relocInfo::relocType rtype);

   Address(int disp, address loc, RelocationHolder spec);

  public:

   // creation

   Address()

     : _base(noreg),

       _index(noreg),

       _scale(no_scale),

       _disp(0) {

   }

   // No default displacement otherwise Register can be implicitly

   // converted to 0(Register) which is quite a different animal.

   Address(Register base, int disp)

     : _base(base),

       _index(noreg),

       _scale(no_scale),

       _disp(disp) {

   }

   Address(Register base, Register index, ScaleFactor scale, int disp = 0)

     : _base (base),

       _index(index),

       _scale(scale),

       _disp (disp) {

     assert(!index->is_valid() == (scale == Address::no_scale),

            "inconsistent address");

   }

   // The following two overloads are used in connection with the

   // ByteSize type (see sizes.hpp).  They simplify the use of

   // ByteSize'd arguments in assembly code. Note that their equivalent

   // for the optimized build are the member functions with int disp

   // argument since ByteSize is mapped to an int type in that case.

   //

   // Note: DO NOT introduce similar overloaded functions for WordSize

   // arguments as in the optimized mode, both ByteSize and WordSize

   // are mapped to the same type and thus the compiler cannot make a

   // distinction anymore (=> compiler errors).

 #ifdef ASSERT

   Address(Register base, ByteSize disp)

     : _base(base),

       _index(noreg),

       _scale(no_scale),

       _disp(in_bytes(disp)) {

   }

   Address(Register base, Register index, ScaleFactor scale, ByteSize disp)

     : _base(base),

       _index(index),

       _scale(scale),

       _disp(in_bytes(disp)) {

     assert(!index->is_valid() == (scale == Address::no_scale),

            "inconsistent address");

   }

 #endif // ASSERT

   // accessors

   bool uses(Register reg) const {

     return _base == reg || _index == reg;

   }

   // Convert the raw encoding form into the form expected by the constructor for

   // Address.  An index of 4 (rsp) corresponds to having no index, so convert

   // that to noreg for the Address constructor.

   static Address make_raw(int base, int index, int scale, int disp);

   static Address make_array(ArrayAddress);

   Register base() const {

     return _base;

   }

   Register index() const {

     return _index;

   }

   int disp() const {

     return _disp;

   }

  private:

   bool base_needs_rex() const {

     return _base != noreg && _base->encoding() >= 8;

   }

   bool index_needs_rex() const {

     return _index != noreg &&_index->encoding() >= 8;

   }

   relocInfo::relocType reloc() const { return _rspec.type(); }

   friend class Assembler;

   friend class MacroAssembler;

   friend class LIR_Assembler; // base/index/scale/disp

 };

 //

 // AddressLiteral has been split out from Address because operands of this type

 // need to be treated specially on 32bit vs. 64bit platforms. By splitting it out

 // the few instructions that need to deal with address literals are unique and the

 // MacroAssembler does not have to implement every instruction in the Assembler

 // in order to search for address literals that may need special handling depending

 // on the instruction and the platform. As small step on the way to merging i486/amd64

 // directories.

 //

 class AddressLiteral VALUE_OBJ_CLASS_SPEC {

   friend class ArrayAddress;

   RelocationHolder _rspec;

   // Typically we use AddressLiterals we want to use their rval

   // However in some situations we want the lval (effect address) of the item.

   // We provide a special factory for making those lvals.

   bool _is_lval;

   // If the target is far we'll need to load the ea of this to

   // a register to reach it. Otherwise if near we can do rip

   // relative addressing.

   address          _target;

  protected:

   // creation

   AddressLiteral()

     : _is_lval(false),

       _target(NULL)

   {}

   public:

   AddressLiteral(address target, relocInfo::relocType rtype);

   AddressLiteral(address target, RelocationHolder const& rspec)

     : _rspec(rspec),

       _is_lval(false),

       _target(target)

   {}

   AddressLiteral addr() {

     AddressLiteral ret = *this;

     ret._is_lval = true;

     return ret;

   }

  private:

   address target() { return _target; }

   bool is_lval() { return _is_lval; }

   relocInfo::relocType reloc() const { return _rspec.type(); }

   const RelocationHolder& rspec() const { return _rspec; }

   friend class Assembler;

   friend class MacroAssembler;

   friend class Address;

   friend class LIR_Assembler;

 };

 // Convience classes

 class RuntimeAddress: public AddressLiteral {

   public:

   RuntimeAddress(address target) : AddressLiteral(target, relocInfo::runtime_call_type) {}

 };

 class OopAddress: public AddressLiteral {

   public:

   OopAddress(address target) : AddressLiteral(target, relocInfo::oop_type){}

 };

 class ExternalAddress: public AddressLiteral {

   public:

   ExternalAddress(address target) : AddressLiteral(target, relocInfo::external_word_type){}

 };

 class InternalAddress: public AddressLiteral {

   public:

   InternalAddress(address target) : AddressLiteral(target, relocInfo::internal_word_type) {}

 };

 // x86 can do array addressing as a single operation since disp can be an absolute

 // address but amd64 can't [e.g. array_base(rx, ry:width) ]. We create a class

 // that expresses the concept but does extra magic on amd64 to get the final result

 class ArrayAddress VALUE_OBJ_CLASS_SPEC {

   private:

   AddressLiteral _base;

   Address        _index;

   public:

   ArrayAddress() {};

   ArrayAddress(AddressLiteral base, Address index): _base(base), _index(index) {};

   AddressLiteral base() { return _base; }

   Address index() { return _index; }

 };

 // The amd64 Assembler: Pure assembler doing NO optimizations on

 // the instruction level (e.g. mov rax, 0 is not translated into xor

 // rax, rax!); i.e., what you write is what you get. The Assembler is

 // generating code into a CodeBuffer.

 const int FPUStateSizeInWords = 512 / wordSize;

 class Assembler : public AbstractAssembler  {

   friend class AbstractAssembler; // for the non-virtual hack

   friend class StubGenerator;

  protected:

 #ifdef ASSERT

   void check_relocation(RelocationHolder const& rspec, int format);

 #endif

   inline void emit_long64(jlong x);

   void emit_data(jint data, relocInfo::relocType rtype, int format /* = 1 */);

   void emit_data(jint data, RelocationHolder const& rspec, int format /* = 1 */);

   void emit_data64(jlong data, relocInfo::relocType rtype, int format = 0);

   void emit_data64(jlong data, RelocationHolder const& rspec, int format = 0);

   // Helper functions for groups of instructions

   void emit_arith_b(int op1, int op2, Register dst, int imm8);

   void emit_arith(int op1, int op2, Register dst, int imm32);

   // only x86??

   void emit_arith(int op1, int op2, Register dst, jobject obj);

   void emit_arith(int op1, int op2, Register dst, Register src);

   void emit_operand(Register reg,

                     Register base, Register index, Address::ScaleFactor scale,

                     int disp,

                     RelocationHolder const& rspec,

                     int rip_relative_correction = 0);

   void emit_operand(Register reg, Address adr,

                     int rip_relative_correction = 0);

   void emit_operand(XMMRegister reg,

                     Register base, Register index, Address::ScaleFactor scale,

                     int disp,

                     RelocationHolder const& rspec,

                     int rip_relative_correction = 0);

   void emit_operand(XMMRegister reg, Address adr,

                     int rip_relative_correction = 0);

   // Immediate-to-memory forms

   void emit_arith_operand(int op1, Register rm, Address adr, int imm32);

   void emit_farith(int b1, int b2, int i);

   bool reachable(AddressLiteral adr);

   // These are all easily abused and hence protected

   // Make these disappear in 64bit mode since they would never be correct

 #ifndef _LP64

   void cmp_literal32(Register src1, int32_t imm32, RelocationHolder const& rspec);

   void cmp_literal32(Address src1, int32_t imm32, RelocationHolder const& rspec);

   void mov_literal32(Register dst, int32_t imm32, RelocationHolder const& rspec);

   void mov_literal32(Address dst, int32_t imm32, RelocationHolder const& rspec);

   void push_literal32(int32_t imm32, RelocationHolder const& rspec);

 #endif // _LP64

   void mov_literal64(Register dst, intptr_t imm64, RelocationHolder const& rspec);

   // These are unique in that we are ensured by the caller that the 32bit

   // relative in these instructions will always be able to reach the potentially

   // 64bit address described by entry. Since they can take a 64bit address they

   // don't have the 32 suffix like the other instructions in this class.

   void jmp_literal(address entry, RelocationHolder const& rspec);

   void call_literal(address entry, RelocationHolder const& rspec);

  public:

   enum Condition { // The amd64 condition codes used for conditional jumps/moves.

     zero          = 0x4,

     notZero       = 0x5,

     equal         = 0x4,

     notEqual      = 0x5,

     less          = 0xc,

     lessEqual     = 0xe,

     greater       = 0xf,

     greaterEqual  = 0xd,

     below         = 0x2,

     belowEqual    = 0x6,

     above         = 0x7,

     aboveEqual    = 0x3,

     overflow      = 0x0,

     noOverflow    = 0x1,

     carrySet      = 0x2,

     carryClear    = 0x3,

     negative      = 0x8,

     positive      = 0x9,

     parity        = 0xa,

     noParity      = 0xb

   };

   enum Prefix {

     // segment overrides

     // XXX remove segment prefixes

     CS_segment = 0x2e,

     SS_segment = 0x36,

     DS_segment = 0x3e,

     ES_segment = 0x26,

     FS_segment = 0x64,

     GS_segment = 0x65,

     REX        = 0x40,

     REX_B      = 0x41,

     REX_X      = 0x42,

     REX_XB     = 0x43,

     REX_R      = 0x44,

     REX_RB     = 0x45,

     REX_RX     = 0x46,

     REX_RXB    = 0x47,

     REX_W      = 0x48,

     REX_WB     = 0x49,

     REX_WX     = 0x4A,

     REX_WXB    = 0x4B,

     REX_WR     = 0x4C,

     REX_WRB    = 0x4D,

     REX_WRX    = 0x4E,

     REX_WRXB   = 0x4F

   };

   enum WhichOperand {

     // input to locate_operand, and format code for relocations

     imm64_operand  = 0,          // embedded 64-bit immediate operand

     disp32_operand = 1,          // embedded 32-bit displacement

     call32_operand = 2,          // embedded 32-bit self-relative displacement

     _WhichOperand_limit = 3

   };

   public:

   // Creation

   Assembler(CodeBuffer* code)

     : AbstractAssembler(code) {

   }

   // Decoding

   static address locate_operand(address inst, WhichOperand which);

   static address locate_next_instruction(address inst);

   // Utilities

  static bool is_simm(int64_t x, int nbits) { return -( CONST64(1) << (nbits-1) )  <= x   &&   x  <  ( CONST64(1) << (nbits-1) ); }

  static bool is_simm32 (int64_t x) { return x == (int64_t)(int32_t)x; }

   // Stack

   void pushaq();

   void popaq();

   void pushfq();

   void popfq();

   void pushq(int imm32);

   void pushq(Register src);

   void pushq(Address src);

   void popq(Register dst);

   void popq(Address dst);

   // Instruction prefixes

   void prefix(Prefix p);

   int prefix_and_encode(int reg_enc, bool byteinst = false);

   int prefixq_and_encode(int reg_enc);

   int prefix_and_encode(int dst_enc, int src_enc, bool byteinst = false);

   int prefixq_and_encode(int dst_enc, int src_enc);

   void prefix(Register reg);

   void prefix(Address adr);

   void prefixq(Address adr);

   void prefix(Address adr, Register reg,  bool byteinst = false);

   void prefixq(Address adr, Register reg);

   void prefix(Address adr, XMMRegister reg);

   // Moves

   void movb(Register dst, Address src);

   void movb(Address dst, int imm8);

   void movb(Address dst, Register src);

   void movw(Address dst, int imm16);

   void movw(Register dst, Address src);

   void movw(Address dst, Register src);

   void movl(Register dst, int imm32);

   void movl(Register dst, Register src);

   void movl(Register dst, Address src);

   void movl(Address dst, int imm32);

   void movl(Address dst, Register src);

   void movq(Register dst, Register src);

   void movq(Register dst, Address src);

   void movq(Address dst, Register src);

   // These prevent using movq from converting a zero (like NULL) into Register

   // by giving the compiler two choices it can't resolve

   void movq(Address dst, void* dummy);

   void movq(Register dst, void* dummy);

   void mov64(Register dst, intptr_t imm64);

   void mov64(Address dst, intptr_t imm64);

   void movsbl(Register dst, Address src);

   void movsbl(Register dst, Register src);

   void movswl(Register dst, Address src);

   void movswl(Register dst, Register src);

   void movslq(Register dst, Address src);

   void movslq(Register dst, Register src);

   void movzbl(Register dst, Address src);

   void movzbl(Register dst, Register src);

   void movzwl(Register dst, Address src);

   void movzwl(Register dst, Register src);

  protected: // Avoid using the next instructions directly.

   // New cpus require use of movsd and movss to avoid partial register stall

   // when loading from memory. But for old Opteron use movlpd instead of movsd.

   // The selection is done in MacroAssembler::movdbl() and movflt().

   void movss(XMMRegister dst, XMMRegister src);

   void movss(XMMRegister dst, Address src);

   void movss(Address dst, XMMRegister src);

   void movsd(XMMRegister dst, XMMRegister src);

   void movsd(Address dst, XMMRegister src);

   void movsd(XMMRegister dst, Address src);

   void movlpd(XMMRegister dst, Address src);

   // New cpus require use of movaps and movapd to avoid partial register stall

   // when moving between registers.

   void movapd(XMMRegister dst, XMMRegister src);

   void movaps(XMMRegister dst, XMMRegister src);

  public:

   void movdl(XMMRegister dst, Register src);

   void movdl(Register dst, XMMRegister src);

   void movdq(XMMRegister dst, Register src);

   void movdq(Register dst, XMMRegister src);

   void cmovl(Condition cc, Register dst, Register src);

   void cmovl(Condition cc, Register dst, Address src);

   void cmovq(Condition cc, Register dst, Register src);

   void cmovq(Condition cc, Register dst, Address src);

   // Prefetches

  private:

   void prefetch_prefix(Address src);

  public:

   void prefetcht0(Address src);

   void prefetcht1(Address src);

   void prefetcht2(Address src);

   void prefetchnta(Address src);

   void prefetchw(Address src);

   // Arithmetics

   void adcl(Register dst, int imm32);

   void adcl(Register dst, Address src);

   void adcl(Register dst, Register src);

   void adcq(Register dst, int imm32);

   void adcq(Register dst, Address src);

   void adcq(Register dst, Register src);

   void addl(Address dst, int imm32);

   void addl(Address dst, Register src);

   void addl(Register dst, int imm32);

   void addl(Register dst, Address src);

   void addl(Register dst, Register src);

   void addq(Address dst, int imm32);

   void addq(Address dst, Register src);

   void addq(Register dst, int imm32);

   void addq(Register dst, Address src);

   void addq(Register dst, Register src);

   void andl(Register dst, int imm32);

   void andl(Register dst, Address src);

   void andl(Register dst, Register src);

   void andq(Register dst, int imm32);

   void andq(Register dst, Address src);

   void andq(Register dst, Register src);

   void cmpb(Address dst, int imm8);

   void cmpl(Address dst, int imm32);

   void cmpl(Register dst, int imm32);

   void cmpl(Register dst, Register src);

   void cmpl(Register dst, Address src);

   void cmpq(Address dst, int imm32);

   void cmpq(Address dst, Register src);

   void cmpq(Register dst, int imm32);

   void cmpq(Register dst, Register src);

   void cmpq(Register dst, Address src);

   void ucomiss(XMMRegister dst, XMMRegister src);

   void ucomisd(XMMRegister dst, XMMRegister src);

  protected:

   // Don't use next inc() and dec() methods directly. INC & DEC instructions

   // could cause a partial flag stall since they don't set CF flag.

   // Use MacroAssembler::decrement() & MacroAssembler::increment() methods

   // which call inc() & dec() or add() & sub() in accordance with

   // the product flag UseIncDec value.

   void decl(Register dst);

   void decl(Address dst);

   void decq(Register dst);

   void decq(Address dst);

   void incl(Register dst);

   void incl(Address dst);

   void incq(Register dst);

   void incq(Address dst);

  public:

   void idivl(Register src);

   void idivq(Register src);

   void cdql();

   void cdqq();

   void imull(Register dst, Register src);

   void imull(Register dst, Register src, int value);

   void imulq(Register dst, Register src);

   void imulq(Register dst, Register src, int value);

   void leal(Register dst, Address src);

   void leaq(Register dst, Address src);

   void mull(Address src);

   void mull(Register src);

   void negl(Register dst);

   void negq(Register dst);

   void notl(Register dst);

   void notq(Register dst);

   void orl(Address dst, int imm32);

   void orl(Register dst, int imm32);

   void orl(Register dst, Address src);

   void orl(Register dst, Register src);

   void orq(Address dst, int imm32);

   void orq(Register dst, int imm32);

   void orq(Register dst, Address src);

   void orq(Register dst, Register src);

   void rcll(Register dst, int imm8);

   void rclq(Register dst, int imm8);

   void sarl(Register dst, int imm8);

   void sarl(Register dst);

   void sarq(Register dst, int imm8);

   void sarq(Register dst);

   void sbbl(Address dst, int imm32);

   void sbbl(Register dst, int imm32);

   void sbbl(Register dst, Address src);

   void sbbl(Register dst, Register src);

   void sbbq(Address dst, int imm32);

   void sbbq(Register dst, int imm32);

   void sbbq(Register dst, Address src);

   void sbbq(Register dst, Register src);

   void shll(Register dst, int imm8);

   void shll(Register dst);

   void shlq(Register dst, int imm8);

   void shlq(Register dst);

   void shrl(Register dst, int imm8);

   void shrl(Register dst);

   void shrq(Register dst, int imm8);

   void shrq(Register dst);

   void subl(Address dst, int imm32);

   void subl(Address dst, Register src);

   void subl(Register dst, int imm32);

   void subl(Register dst, Address src);

   void subl(Register dst, Register src);

   void subq(Address dst, int imm32);

   void subq(Address dst, Register src);

   void subq(Register dst, int imm32);

   void subq(Register dst, Address src);

   void subq(Register dst, Register src);

   void testb(Register dst, int imm8);

   void testl(Register dst, int imm32);

   void testl(Register dst, Register src);

   void testq(Register dst, int imm32);

   void testq(Register dst, Register src);

   void xaddl(Address dst, Register src);

   void xaddq(Address dst, Register src);

   void xorl(Register dst, int imm32);

   void xorl(Register dst, Address src);

   void xorl(Register dst, Register src);

   void xorq(Register dst, int imm32);

   void xorq(Register dst, Address src);

   void xorq(Register dst, Register src);

   // Miscellaneous

   void bswapl(Register reg);

   void bswapq(Register reg);

   void lock();

   void xchgl(Register reg, Address adr);

   void xchgl(Register dst, Register src);

   void xchgq(Register reg, Address adr);

   void xchgq(Register dst, Register src);

   void cmpxchgl(Register reg, Address adr);

   void cmpxchgq(Register reg, Address adr);

   void nop(int i = 1);

   void addr_nop_4();

   void addr_nop_5();

   void addr_nop_7();

   void addr_nop_8();

   void hlt();

   void ret(int imm16);

   void smovl();

   void rep_movl();

   void rep_movq();

   void rep_set();

   void repne_scanl();

   void repne_scanq();

   void setb(Condition cc, Register dst);

   void clflush(Address adr);

   enum Membar_mask_bits {

     StoreStore = 1 << 3,

     LoadStore  = 1 << 2,

     StoreLoad  = 1 << 1,

     LoadLoad   = 1 << 0

   };

   // Serializes memory.

   void membar(Membar_mask_bits order_constraint) {

     // We only have to handle StoreLoad and LoadLoad

     if (order_constraint & StoreLoad) {

       // MFENCE subsumes LFENCE

       mfence();

     } /* [jk] not needed currently: else if (order_constraint & LoadLoad) {

          lfence();

     } */

   }

   void lfence() {

     emit_byte(0x0F);

     emit_byte(0xAE);

     emit_byte(0xE8);

   }

   void mfence() {

     emit_byte(0x0F);

     emit_byte(0xAE);

     emit_byte(0xF0);

   }

   // Identify processor type and features

   void cpuid() {

     emit_byte(0x0F);

     emit_byte(0xA2);

   }

   void cld() { emit_byte(0xfc);

   }

   void std() { emit_byte(0xfd);

   }

   // Calls

   void call(Label& L, relocInfo::relocType rtype);

   void call(Register reg);

   void call(Address adr);

   // Jumps

   void jmp(Register reg);

   void jmp(Address adr);

   // Label operations & relative jumps (PPUM Appendix D)

   // unconditional jump to L

   void jmp(Label& L, relocInfo::relocType rtype = relocInfo::none);

   // Unconditional 8-bit offset jump to L.

   // WARNING: be very careful using this for forward jumps.  If the label is

   // not bound within an 8-bit offset of this instruction, a run-time error

   // will occur.

   void jmpb(Label& L);

   // jcc is the generic conditional branch generator to run- time

   // routines, jcc is used for branches to labels. jcc takes a branch

   // opcode (cc) and a label (L) and generates either a backward

   // branch or a forward branch and links it to the label fixup

   // chain. Usage:

   //

   // Label L;      // unbound label

   // jcc(cc, L);   // forward branch to unbound label

   // bind(L);      // bind label to the current pc

   // jcc(cc, L);   // backward branch to bound label

   // bind(L);      // illegal: a label may be bound only once

   //

   // Note: The same Label can be used for forward and backward branches

   // but it may be bound only once.

   void jcc(Condition cc, Label& L,

            relocInfo::relocType rtype = relocInfo::none);

   // Conditional jump to a 8-bit offset to L.

   // WARNING: be very careful using this for forward jumps.  If the label is

   // not bound within an 8-bit offset of this instruction, a run-time error

   // will occur.

   void jccb(Condition cc, Label& L);

   // Floating-point operations

   void fxsave(Address dst);

   void fxrstor(Address src);

   void ldmxcsr(Address src);

   void stmxcsr(Address dst);

   void addss(XMMRegister dst, XMMRegister src);

   void addss(XMMRegister dst, Address src);

   void subss(XMMRegister dst, XMMRegister src);

   void subss(XMMRegister dst, Address src);

   void mulss(XMMRegister dst, XMMRegister src);

   void mulss(XMMRegister dst, Address src);

   void divss(XMMRegister dst, XMMRegister src);

   void divss(XMMRegister dst, Address src);

   void addsd(XMMRegister dst, XMMRegister src);

   void addsd(XMMRegister dst, Address src);

   void subsd(XMMRegister dst, XMMRegister src);

   void subsd(XMMRegister dst, Address src);

   void mulsd(XMMRegister dst, XMMRegister src);

   void mulsd(XMMRegister dst, Address src);

   void divsd(XMMRegister dst, XMMRegister src);

   void divsd(XMMRegister dst, Address src);

   // We only need the double form

   void sqrtsd(XMMRegister dst, XMMRegister src);

   void sqrtsd(XMMRegister dst, Address src);

   void xorps(XMMRegister dst, XMMRegister src);

   void xorps(XMMRegister dst, Address src);

   void xorpd(XMMRegister dst, XMMRegister src);

   void xorpd(XMMRegister dst, Address src);

   void cvtsi2ssl(XMMRegister dst, Register src);

   void cvtsi2ssq(XMMRegister dst, Register src);

   void cvtsi2sdl(XMMRegister dst, Register src);

   void cvtsi2sdq(XMMRegister dst, Register src);

   void cvttss2sil(Register dst, XMMRegister src); // truncates

   void cvttss2siq(Register dst, XMMRegister src); // truncates

   void cvttsd2sil(Register dst, XMMRegister src); // truncates

   void cvttsd2siq(Register dst, XMMRegister src); // truncates

   void cvtss2sd(XMMRegister dst, XMMRegister src);

   void cvtsd2ss(XMMRegister dst, XMMRegister src);

   void cvtdq2pd(XMMRegister dst, XMMRegister src);

   void cvtdq2ps(XMMRegister dst, XMMRegister src);

   void pxor(XMMRegister dst, Address src);       // Xor Packed Byte Integer Values

   void pxor(XMMRegister dst, XMMRegister src);   // Xor Packed Byte Integer Values

   void movdqa(XMMRegister dst, Address src);     // Move Aligned Double Quadword

   void movdqa(XMMRegister dst, XMMRegister src);

   void movdqa(Address     dst, XMMRegister src);

   void movq(XMMRegister dst, Address src);

   void movq(Address dst, XMMRegister src);

   void pshufd(XMMRegister dst, XMMRegister src, int mode); // Shuffle Packed Doublewords

   void pshufd(XMMRegister dst, Address src,     int mode);

   void pshuflw(XMMRegister dst, XMMRegister src, int mode); // Shuffle Packed Low Words

   void pshuflw(XMMRegister dst, Address src,     int mode);

   void psrlq(XMMRegister dst, int shift); // Shift Right Logical Quadword Immediate

   void punpcklbw(XMMRegister dst, XMMRegister src); // Interleave Low Bytes

   void punpcklbw(XMMRegister dst, Address src);

 };

 // MacroAssembler extends Assembler by frequently used macros.

 //

 // Instructions for which a 'better' code sequence exists depending

 // on arguments should also go in here.

 class MacroAssembler : public Assembler {

  friend class LIR_Assembler;

  protected:

   Address as_Address(AddressLiteral adr);

   Address as_Address(ArrayAddress adr);

   // Support for VM calls

   //

   // This is the base routine called by the different versions of

   // call_VM_leaf. The interpreter may customize this version by

   // overriding it for its purposes (e.g., to save/restore additional

   // registers when doing a VM call).

   virtual void call_VM_leaf_base(

     address entry_point,               // the entry point

     int     number_of_arguments        // the number of arguments to

                                        // pop after the call

   );

   // This is the base routine called by the different versions of

   // call_VM. The interpreter may customize this version by overriding

   // it for its purposes (e.g., to save/restore additional registers

   // when doing a VM call).

   //

   // If no java_thread register is specified (noreg) than rdi will be

   // used instead. call_VM_base returns the register which contains

   // the thread upon return. If a thread register has been specified,

   // the return value will correspond to that register. If no

   // last_java_sp is specified (noreg) than rsp will be used instead.

   virtual void call_VM_base(           // returns the register

                                        // containing the thread upon

                                        // return

     Register oop_result,               // where an oop-result ends up

                                        // if any; use noreg otherwise

     Register java_thread,              // the thread if computed

                                        // before ; use noreg otherwise

     Register last_java_sp,             // to set up last_Java_frame in

                                        // stubs; use noreg otherwise

     address  entry_point,              // the entry point

     int      number_of_arguments,      // the number of arguments (w/o

                                        // thread) to pop after the

                                        // call

     bool     check_exceptions          // whether to check for pending

                                        // exceptions after return

   );

   // This routines should emit JVMTI PopFrame handling and ForceEarlyReturn code.

   // The implementation is only non-empty for the InterpreterMacroAssembler,

   // as only the interpreter handles PopFrame and ForceEarlyReturn requests.

   virtual void check_and_handle_popframe(Register java_thread);

   virtual void check_and_handle_earlyret(Register java_thread);

   void call_VM_helper(Register oop_result,

                       address entry_point,

                       int number_of_arguments,

                       bool check_exceptions = true);

  public:

   MacroAssembler(CodeBuffer* code) : Assembler(code) {}

   // Support for NULL-checks

   //

   // Generates code that causes a NULL OS exception if the content of

   // reg is NULL.  If the accessed location is M[reg + offset] and the

   // offset is known, provide the offset. No explicit code generation

   // is needed if the offset is within a certain range (0 <= offset <=

   // page_size).

   void null_check(Register reg, int offset = -1);

   static bool needs_explicit_null_check(int offset);

   // Required platform-specific helpers for Label::patch_instructions.

   // They _shadow_ the declarations in AbstractAssembler, which are undefined.

   void pd_patch_instruction(address branch, address target);

 #ifndef PRODUCT

   static void pd_print_patched_instruction(address branch);

 #endif

   // The following 4 methods return the offset of the appropriate move

   // instruction.  Note: these are 32 bit instructions

   // Support for fast byte/word loading with zero extension (depending

   // on particular CPU)

   int load_unsigned_byte(Register dst, Address src);

   int load_unsigned_word(Register dst, Address src);

   // Support for fast byte/word loading with sign extension (depending

   // on particular CPU)

   int load_signed_byte(Register dst, Address src);

   int load_signed_word(Register dst, Address src);

   // Support for inc/dec with optimal instruction selection depending

   // on value

   void incrementl(Register reg, int value = 1);

   void decrementl(Register reg, int value = 1);

   void incrementq(Register reg, int value = 1);

   void decrementq(Register reg, int value = 1);

   void incrementl(Address dst, int value = 1);

   void decrementl(Address dst, int value = 1);

   void incrementq(Address dst, int value = 1);

   void decrementq(Address dst, int value = 1);

   // Support optimal SSE move instructions.

   void movflt(XMMRegister dst, XMMRegister src) {

     if (UseXmmRegToRegMoveAll) { movaps(dst, src); return; }

     else                       { movss (dst, src); return; }

   }

   void movflt(XMMRegister dst, Address src) { movss(dst, src); }

   void movflt(XMMRegister dst, AddressLiteral src);

   void movflt(Address dst, XMMRegister src) { movss(dst, src); }

   void movdbl(XMMRegister dst, XMMRegister src) {

     if (UseXmmRegToRegMoveAll) { movapd(dst, src); return; }

     else                       { movsd (dst, src); return; }

   }

   void movdbl(XMMRegister dst, AddressLiteral src);

   void movdbl(XMMRegister dst, Address src) {

     if (UseXmmLoadAndClearUpper) { movsd (dst, src); return; }

     else                         { movlpd(dst, src); return; }

   }

   void movdbl(Address dst, XMMRegister src) { movsd(dst, src); }

   void incrementl(AddressLiteral dst);

   void incrementl(ArrayAddress dst);

   // Alignment

   void align(int modulus);

   // Misc

   void fat_nop(); // 5 byte nop

   // C++ bool manipulation

   void movbool(Register dst, Address src);

   void movbool(Address dst, bool boolconst);

   void movbool(Address dst, Register src);

   void testbool(Register dst);

   // oop manipulations

   void load_klass(Register dst, Register src);

   void store_klass(Register dst, Register src);

   void load_heap_oop(Register dst, Address src);

   void store_heap_oop(Address dst, Register src);

   void encode_heap_oop(Register r);

   void decode_heap_oop(Register r);

   void encode_heap_oop_not_null(Register r);

   void decode_heap_oop_not_null(Register r);

   void encode_heap_oop_not_null(Register dst, Register src);

   void decode_heap_oop_not_null(Register dst, Register src);

   // Stack frame creation/removal

   void enter();

   void leave();

   // Support for getting the JavaThread pointer (i.e.; a reference to

   // thread-local information) The pointer will be loaded into the

   // thread register.

   void get_thread(Register thread);

   void int3();

   // Support for VM calls

   //

   // It is imperative that all calls into the VM are handled via the

   // call_VM macros.  They make sure that the stack linkage is setup

   // correctly. call_VM's correspond to ENTRY/ENTRY_X entry points

   // while call_VM_leaf's correspond to LEAF entry points.

   void call_VM(Register oop_result,

                address entry_point,

                bool check_exceptions = true);

   void call_VM(Register oop_result,

                address entry_point,

                Register arg_1,

                bool check_exceptions = true);

   void call_VM(Register oop_result,

                address entry_point,

                Register arg_1, Register arg_2,

                bool check_exceptions = true);

   void call_VM(Register oop_result,

                address entry_point,

                Register arg_1, Register arg_2, Register arg_3,

                bool check_exceptions = true);

   // Overloadings with last_Java_sp

   void call_VM(Register oop_result,

                Register last_java_sp,

                address entry_point,

                int number_of_arguments = 0,

                bool check_exceptions = true);

   void call_VM(Register oop_result,

                Register last_java_sp,

                address entry_point,

                Register arg_1, bool

                check_exceptions = true);

   void call_VM(Register oop_result,

                Register last_java_sp,

                address entry_point,

                Register arg_1, Register arg_2,

                bool check_exceptions = true);

   void call_VM(Register oop_result,

                Register last_java_sp,

                address entry_point,

                Register arg_1, Register arg_2, Register arg_3,

                bool check_exceptions = true);

   void call_VM_leaf(address entry_point,

                     int number_of_arguments = 0);

   void call_VM_leaf(address entry_point,

                     Register arg_1);

   void call_VM_leaf(address entry_point,

                     Register arg_1, Register arg_2);

   void call_VM_leaf(address entry_point,

                     Register arg_1, Register arg_2, Register arg_3);

   // last Java Frame (fills frame anchor)

   void set_last_Java_frame(Register last_java_sp,

                            Register last_java_fp,

                            address last_java_pc);

   void reset_last_Java_frame(bool clear_fp, bool clear_pc);

   // Stores

   void store_check(Register obj);                // store check for

                                                  // obj - register is

                                                  // destroyed

                                                  // afterwards

   void store_check(Register obj, Address dst);   // same as above, dst

                                                  // is exact store

                                                  // location (reg. is

                                                  // destroyed)

   void g1_write_barrier_pre(Register obj, Register tmp, Register tmp2, bool tosca_live );

   void g1_write_barrier_post(Register store_addr, Register new_val, Register tmp, Register tmp2);

   // split store_check(Register obj) to enhance instruction interleaving

   void store_check_part_1(Register obj);

   void store_check_part_2(Register obj);

   // C 'boolean' to Java boolean: x == 0 ? 0 : 1

   void c2bool(Register x);

   // Int division/reminder for Java

   // (as idivl, but checks for special case as described in JVM spec.)

   // returns idivl instruction offset for implicit exception handling

   int corrected_idivl(Register reg);

   // Long division/reminder for Java

   // (as idivq, but checks for special case as described in JVM spec.)

   // returns idivq instruction offset for implicit exception handling

   int corrected_idivq(Register reg);

   // Push and pop integer/fpu/cpu state

   void push_IU_state();

   void pop_IU_state();

   void push_FPU_state();

   void pop_FPU_state();

   void push_CPU_state();

   void pop_CPU_state();

   // Sign extension

   void sign_extend_short(Register reg);

   void sign_extend_byte(Register reg);

   // Division by power of 2, rounding towards 0

   void division_with_shift(Register reg, int shift_value);

   // Round up to a power of two

   void round_to_l(Register reg, int modulus);

   void round_to_q(Register reg, int modulus);

   // allocation

   void eden_allocate(

     Register obj,               // result: pointer to object after

                                 // successful allocation

     Register var_size_in_bytes, // object size in bytes if unknown at

                                 // compile time; invalid otherwise

     int con_size_in_bytes,      // object size in bytes if known at

                                 // compile time

     Register t1,                // temp register

     Label& slow_case            // continuation point if fast

                                 // allocation fails

     );

   void tlab_allocate(

     Register obj,               // result: pointer to object after

                                 // successful allocation

     Register var_size_in_bytes, // object size in bytes if unknown at

                                 // compile time; invalid otherwise

     int con_size_in_bytes,      // object size in bytes if known at

                                 // compile time

     Register t1,                // temp register

     Register t2,                // temp register

     Label& slow_case            // continuation point if fast

                                 // allocation fails

   );

   void tlab_refill(Label& retry_tlab, Label& try_eden, Label& slow_case);

   //----

   // Debugging

   // only if +VerifyOops

   void verify_oop(Register reg, const char* s = "broken oop");

   void verify_oop_addr(Address addr, const char * s = "broken oop addr");

   // if heap base register is used - reinit it with the correct value

   void reinit_heapbase();

   // only if +VerifyFPU

   void verify_FPU(int stack_depth, const char* s = "illegal FPU state") {}

   // prints msg, dumps registers and stops execution

   void stop(const char* msg);

   // prints message and continues

   void warn(const char* msg);

   static void debug(char* msg, int64_t pc, int64_t regs[]);

   void os_breakpoint();

   void untested()

   {

     stop("untested");

   }

   void unimplemented(const char* what = "")

   {

     char* b = new char[1024];

     sprintf(b, "unimplemented: %s", what);

     stop(b);

   }

   void should_not_reach_here()

   {

     stop("should not reach here");

   }

   // Stack overflow checking

   void bang_stack_with_offset(int offset)

   {

     // stack grows down, caller passes positive offset

     assert(offset > 0, "must bang with negative offset");

     movl(Address(rsp, (-offset)), rax);

   }

   // Writes to stack successive pages until offset reached to check for

   // stack overflow + shadow pages.  Also, clobbers tmp

   void bang_stack_size(Register offset, Register tmp);

   // Support for serializing memory accesses between threads.

   void serialize_memory(Register thread, Register tmp);

   void verify_tlab();

   // Biased locking support

   // lock_reg and obj_reg must be loaded up with the appropriate values.

   // swap_reg must be rax and is killed.

   // tmp_reg must be supplied and is killed.

   // If swap_reg_contains_mark is true then the code assumes that the

   // mark word of the object has already been loaded into swap_reg.

   // Optional slow case is for implementations (interpreter and C1) which branch to

   // slow case directly. Leaves condition codes set for C2's Fast_Lock node.

   // Returns offset of first potentially-faulting instruction for null

   // check info (currently consumed only by C1). If

   // swap_reg_contains_mark is true then returns -1 as it is assumed

   // the calling code has already passed any potential faults.

   int biased_locking_enter(Register lock_reg, Register obj_reg, Register swap_reg, Register tmp_reg,

                            bool swap_reg_contains_mark,

                            Label& done, Label* slow_case = NULL,

                            BiasedLockingCounters* counters = NULL);

   void biased_locking_exit (Register obj_reg, Register temp_reg, Label& done);

   Condition negate_condition(Condition cond);

   // Instructions that use AddressLiteral operands. These instruction can handle 32bit/64bit

   // operands. In general the names are modified to avoid hiding the instruction in Assembler

   // so that we don't need to implement all the varieties in the Assembler with trivial wrappers

   // here in MacroAssembler. The major exception to this rule is call

   // Arithmetics

   void cmp8(AddressLiteral src1, int8_t imm32);

   void cmp32(AddressLiteral src1, int32_t src2);

   // compare reg - mem, or reg - &mem

   void cmp32(Register src1, AddressLiteral src2);

   void cmp32(Register src1, Address src2);

 #ifndef _LP64

   void cmpoop(Address dst, jobject obj);

   void cmpoop(Register dst, jobject obj);

 #endif // _LP64

   // NOTE src2 must be the lval. This is NOT an mem-mem compare

   void cmpptr(Address src1, AddressLiteral src2);

   void cmpptr(Register src1, AddressLiteral src);

   // will be cmpreg(?)

   void cmp64(Register src1, AddressLiteral src);

   void cmpxchgptr(Register reg, Address adr);

   void cmpxchgptr(Register reg, AddressLiteral adr);

   // Helper functions for statistics gathering.

   // Conditionally (atomically, on MPs) increments passed counter address, preserving condition codes.

   void cond_inc32(Condition cond, AddressLiteral counter_addr);

   // Unconditional atomic increment.

   void atomic_incl(AddressLiteral counter_addr);

   void lea(Register dst, AddressLiteral src);

   void lea(Register dst, Address src);

   // Calls

   void call(Label& L, relocInfo::relocType rtype);

   void call(Register entry);

   void call(AddressLiteral entry);

   // Jumps

   // 32bit can do a case table jump in one instruction but we no longer allow the base

   // to be installed in the Address class

   void jump(ArrayAddress entry);

   void jump(AddressLiteral entry);

   void jump_cc(Condition cc, AddressLiteral dst);

   // Floating

   void ldmxcsr(Address src) { Assembler::ldmxcsr(src); }

   void ldmxcsr(AddressLiteral src);

 private:

   // these are private because users should be doing movflt/movdbl

   void movss(XMMRegister dst, XMMRegister src) { Assembler::movss(dst, src); }

   void movss(Address dst, XMMRegister src)       { Assembler::movss(dst, src); }

   void movss(XMMRegister dst, Address src)       { Assembler::movss(dst, src); }

   void movss(XMMRegister dst, AddressLiteral src);

   void movlpd(XMMRegister dst, Address src)      {Assembler::movlpd(dst, src); }

   void movlpd(XMMRegister dst, AddressLiteral src);

 public:

   void xorpd(XMMRegister dst, XMMRegister src) {Assembler::xorpd(dst, src); }

   void xorpd(XMMRegister dst, Address src)       {Assembler::xorpd(dst, src); }

   void xorpd(XMMRegister dst, AddressLiteral src);

   void xorps(XMMRegister dst, XMMRegister src) {Assembler::xorps(dst, src); }

   void xorps(XMMRegister dst, Address src)       {Assembler::xorps(dst, src); }

   void xorps(XMMRegister dst, AddressLiteral src);

   // Data

   void movoop(Register dst, jobject obj);

   void movoop(Address dst, jobject obj);

   void movptr(ArrayAddress dst, Register src);

   void movptr(Register dst, AddressLiteral src);

   void movptr(Register dst, intptr_t src);

   void movptr(Address dst, intptr_t src);

   void movptr(Register dst, ArrayAddress src);

   // to avoid hiding movl

   void mov32(AddressLiteral dst, Register src);

   void mov32(Register dst, AddressLiteral src);

   void pushoop(jobject obj);

   // Can push value or effective address

   void pushptr(AddressLiteral src);

 };

 /**

  * class SkipIfEqual:

  *

  * Instantiating this class will result in assembly code being output that will

  * jump around any code emitted between the creation of the instance and it's

  * automatic destruction at the end of a scope block, depending on the value of

  * the flag passed to the constructor, which will be checked at run-time.

  */

 class SkipIfEqual {

  private:

   MacroAssembler* _masm;

   Label _label;

  public:

    SkipIfEqual(MacroAssembler*, const bool* flag_addr, bool value);

    ~SkipIfEqual();

 };

 #ifdef ASSERT

 inline bool AbstractAssembler::pd_check_instruction_mark() { return true; }

 #endif