1 /*
   2  * Copyright (c) 2000, 2021, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #ifndef SHARE_C1_C1_LIR_HPP
  26 #define SHARE_C1_C1_LIR_HPP
  27 
  28 #include "c1/c1_Defs.hpp"
  29 #include "c1/c1_ValueType.hpp"
  30 #include "oops/method.hpp"
  31 #include "utilities/globalDefinitions.hpp"
  32 
  33 class BlockBegin;
  34 class BlockList;
  35 class LIR_Assembler;
  36 class CodeEmitInfo;
  37 class CodeStub;
  38 class CodeStubList;
  39 class C1SafepointPollStub;
  40 class ArrayCopyStub;
  41 class LIR_Op;
  42 class ciType;
  43 class ValueType;
  44 class LIR_OpVisitState;
  45 class FpuStackSim;
  46 
  47 //---------------------------------------------------------------------
  48 //                 LIR Operands
  49 //  LIR_OprDesc
  50 //    LIR_OprPtr
  51 //      LIR_Const
  52 //      LIR_Address
  53 //---------------------------------------------------------------------
  54 class LIR_OprDesc;
  55 class LIR_OprPtr;
  56 class LIR_Const;
  57 class LIR_Address;
  58 class LIR_OprVisitor;
  59 
  60 
  61 typedef LIR_OprDesc* LIR_Opr;
  62 typedef int          RegNr;
  63 
  64 typedef GrowableArray<LIR_Opr> LIR_OprList;
  65 typedef GrowableArray<LIR_Op*> LIR_OpArray;
  66 typedef GrowableArray<LIR_Op*> LIR_OpList;
  67 
  68 // define LIR_OprPtr early so LIR_OprDesc can refer to it
  69 class LIR_OprPtr: public CompilationResourceObj {
  70  public:
  71   bool is_oop_pointer() const                    { return (type() == T_OBJECT); }
  72   bool is_float_kind() const                     { BasicType t = type(); return (t == T_FLOAT) || (t == T_DOUBLE); }
  73 
  74   virtual LIR_Const*  as_constant()              { return NULL; }
  75   virtual LIR_Address* as_address()              { return NULL; }
  76   virtual BasicType type() const                 = 0;
  77   virtual void print_value_on(outputStream* out) const = 0;
  78 };
  79 
  80 
  81 
  82 // LIR constants
  83 class LIR_Const: public LIR_OprPtr {
  84  private:
  85   JavaValue _value;
  86 
  87   void type_check(BasicType t) const   { assert(type() == t, "type check"); }
  88   void type_check(BasicType t1, BasicType t2) const   { assert(type() == t1 || type() == t2, "type check"); }
  89   void type_check(BasicType t1, BasicType t2, BasicType t3) const   { assert(type() == t1 || type() == t2 || type() == t3, "type check"); }
  90 
  91  public:
  92   LIR_Const(jint i, bool is_address=false)       { _value.set_type(is_address?T_ADDRESS:T_INT); _value.set_jint(i); }
  93   LIR_Const(jlong l)                             { _value.set_type(T_LONG);    _value.set_jlong(l); }
  94   LIR_Const(jfloat f)                            { _value.set_type(T_FLOAT);   _value.set_jfloat(f); }
  95   LIR_Const(jdouble d)                           { _value.set_type(T_DOUBLE);  _value.set_jdouble(d); }
  96   LIR_Const(jobject o)                           { _value.set_type(T_OBJECT);  _value.set_jobject(o); }
  97   LIR_Const(void* p) {
  98 #ifdef _LP64
  99     assert(sizeof(jlong) >= sizeof(p), "too small");;
 100     _value.set_type(T_LONG);    _value.set_jlong((jlong)p);
 101 #else
 102     assert(sizeof(jint) >= sizeof(p), "too small");;
 103     _value.set_type(T_INT);     _value.set_jint((jint)p);
 104 #endif
 105   }
 106   LIR_Const(Metadata* m) {
 107     _value.set_type(T_METADATA);
 108 #ifdef _LP64
 109     _value.set_jlong((jlong)m);
 110 #else
 111     _value.set_jint((jint)m);
 112 #endif // _LP64
 113   }
 114 
 115   virtual BasicType type()       const { return _value.get_type(); }
 116   virtual LIR_Const* as_constant()     { return this; }
 117 
 118   jint      as_jint()    const         { type_check(T_INT, T_ADDRESS); return _value.get_jint(); }
 119   jlong     as_jlong()   const         { type_check(T_LONG  ); return _value.get_jlong(); }
 120   jfloat    as_jfloat()  const         { type_check(T_FLOAT ); return _value.get_jfloat(); }
 121   jdouble   as_jdouble() const         { type_check(T_DOUBLE); return _value.get_jdouble(); }
 122   jobject   as_jobject() const         { type_check(T_OBJECT); return _value.get_jobject(); }
 123   jint      as_jint_lo() const         { type_check(T_LONG  ); return low(_value.get_jlong()); }
 124   jint      as_jint_hi() const         { type_check(T_LONG  ); return high(_value.get_jlong()); }
 125 
 126 #ifdef _LP64
 127   address   as_pointer() const         { type_check(T_LONG  ); return (address)_value.get_jlong(); }
 128   Metadata* as_metadata() const        { type_check(T_METADATA); return (Metadata*)_value.get_jlong(); }
 129 #else
 130   address   as_pointer() const         { type_check(T_INT   ); return (address)_value.get_jint(); }
 131   Metadata* as_metadata() const        { type_check(T_METADATA); return (Metadata*)_value.get_jint(); }
 132 #endif
 133 
 134 
 135   jint      as_jint_bits() const       { type_check(T_FLOAT, T_INT, T_ADDRESS); return _value.get_jint(); }
 136   jint      as_jint_lo_bits() const    {
 137     if (type() == T_DOUBLE) {
 138       return low(jlong_cast(_value.get_jdouble()));
 139     } else {
 140       return as_jint_lo();
 141     }
 142   }
 143   jint      as_jint_hi_bits() const    {
 144     if (type() == T_DOUBLE) {
 145       return high(jlong_cast(_value.get_jdouble()));
 146     } else {
 147       return as_jint_hi();
 148     }
 149   }
 150   jlong      as_jlong_bits() const    {
 151     if (type() == T_DOUBLE) {
 152       return jlong_cast(_value.get_jdouble());
 153     } else {
 154       return as_jlong();
 155     }
 156   }
 157 
 158   virtual void print_value_on(outputStream* out) const PRODUCT_RETURN;
 159 
 160 
 161   bool is_zero_float() {
 162     jfloat f = as_jfloat();
 163     jfloat ok = 0.0f;
 164     return jint_cast(f) == jint_cast(ok);
 165   }
 166 
 167   bool is_one_float() {
 168     jfloat f = as_jfloat();
 169     return !g_isnan(f) && g_isfinite(f) && f == 1.0;
 170   }
 171 
 172   bool is_zero_double() {
 173     jdouble d = as_jdouble();
 174     jdouble ok = 0.0;
 175     return jlong_cast(d) == jlong_cast(ok);
 176   }
 177 
 178   bool is_one_double() {
 179     jdouble d = as_jdouble();
 180     return !g_isnan(d) && g_isfinite(d) && d == 1.0;
 181   }
 182 };
 183 
 184 
 185 //---------------------LIR Operand descriptor------------------------------------
 186 //
 187 // The class LIR_OprDesc represents a LIR instruction operand;
 188 // it can be a register (ALU/FPU), stack location or a constant;
 189 // Constants and addresses are represented as resource area allocated
 190 // structures (see above).
 191 // Registers and stack locations are inlined into the this pointer
 192 // (see value function).
 193 
 194 class LIR_OprDesc: public CompilationResourceObj {
 195  public:
 196   // value structure:
 197   //     data       opr-type opr-kind
 198   // +--------------+-------+-------+
 199   // [max...........|7 6 5 4|3 2 1 0]
 200   //                               ^
 201   //                         is_pointer bit
 202   //
 203   // lowest bit cleared, means it is a structure pointer
 204   // we need  4 bits to represent types
 205 
 206  private:
 207   friend class LIR_OprFact;
 208 
 209   // Conversion
 210   intptr_t value() const                         { return (intptr_t) this; }
 211 
 212   bool check_value_mask(intptr_t mask, intptr_t masked_value) const {
 213     return (value() & mask) == masked_value;
 214   }
 215 
 216   enum OprKind {
 217       pointer_value      = 0
 218     , stack_value        = 1
 219     , cpu_register       = 3
 220     , fpu_register       = 5
 221     , illegal_value      = 7
 222   };
 223 
 224   enum OprBits {
 225       pointer_bits   = 1
 226     , kind_bits      = 3
 227     , type_bits      = 4
 228     , size_bits      = 2
 229     , destroys_bits  = 1
 230     , virtual_bits   = 1
 231     , is_xmm_bits    = 1
 232     , last_use_bits  = 1
 233     , is_fpu_stack_offset_bits = 1        // used in assertion checking on x86 for FPU stack slot allocation
 234     , non_data_bits  = pointer_bits + kind_bits + type_bits + size_bits + destroys_bits + virtual_bits
 235                        + is_xmm_bits + last_use_bits + is_fpu_stack_offset_bits
 236     , data_bits      = BitsPerInt - non_data_bits
 237     , reg_bits       = data_bits / 2      // for two registers in one value encoding
 238   };
 239 
 240   enum OprShift {
 241       kind_shift     = 0
 242     , type_shift     = kind_shift     + kind_bits
 243     , size_shift     = type_shift     + type_bits
 244     , destroys_shift = size_shift     + size_bits
 245     , last_use_shift = destroys_shift + destroys_bits
 246     , is_fpu_stack_offset_shift = last_use_shift + last_use_bits
 247     , virtual_shift  = is_fpu_stack_offset_shift + is_fpu_stack_offset_bits
 248     , is_xmm_shift   = virtual_shift + virtual_bits
 249     , data_shift     = is_xmm_shift + is_xmm_bits
 250     , reg1_shift = data_shift
 251     , reg2_shift = data_shift + reg_bits
 252 
 253   };
 254 
 255   enum OprSize {
 256       single_size = 0 << size_shift
 257     , double_size = 1 << size_shift
 258   };
 259 
 260   enum OprMask {
 261       kind_mask      = right_n_bits(kind_bits)
 262     , type_mask      = right_n_bits(type_bits) << type_shift
 263     , size_mask      = right_n_bits(size_bits) << size_shift
 264     , last_use_mask  = right_n_bits(last_use_bits) << last_use_shift
 265     , is_fpu_stack_offset_mask = right_n_bits(is_fpu_stack_offset_bits) << is_fpu_stack_offset_shift
 266     , virtual_mask   = right_n_bits(virtual_bits) << virtual_shift
 267     , is_xmm_mask    = right_n_bits(is_xmm_bits) << is_xmm_shift
 268     , pointer_mask   = right_n_bits(pointer_bits)
 269     , lower_reg_mask = right_n_bits(reg_bits)
 270     , no_type_mask   = (int)(~(type_mask | last_use_mask | is_fpu_stack_offset_mask))
 271   };
 272 
 273   uintptr_t data() const                         { return value() >> data_shift; }
 274   int lo_reg_half() const                        { return data() & lower_reg_mask; }
 275   int hi_reg_half() const                        { return (data() >> reg_bits) & lower_reg_mask; }
 276   OprKind kind_field() const                     { return (OprKind)(value() & kind_mask); }
 277   OprSize size_field() const                     { return (OprSize)(value() & size_mask); }
 278 
 279   static char type_char(BasicType t);
 280 
 281  public:
 282   enum {
 283     vreg_base = ConcreteRegisterImpl::number_of_registers,
 284     vreg_max = (1 << data_bits) - 1
 285   };
 286 
 287   static inline LIR_Opr illegalOpr();
 288 
 289   enum OprType {
 290       unknown_type  = 0 << type_shift    // means: not set (catch uninitialized types)
 291     , int_type      = 1 << type_shift
 292     , long_type     = 2 << type_shift
 293     , object_type   = 3 << type_shift
 294     , address_type  = 4 << type_shift
 295     , float_type    = 5 << type_shift
 296     , double_type   = 6 << type_shift
 297     , metadata_type = 7 << type_shift
 298   };
 299   friend OprType as_OprType(BasicType t);
 300   friend BasicType as_BasicType(OprType t);
 301 
 302   OprType type_field_valid() const               { assert(is_register() || is_stack(), "should not be called otherwise"); return (OprType)(value() & type_mask); }
 303   OprType type_field() const                     { return is_illegal() ? unknown_type : (OprType)(value() & type_mask); }
 304 
 305   static OprSize size_for(BasicType t) {
 306     switch (t) {
 307       case T_LONG:
 308       case T_DOUBLE:
 309         return double_size;
 310         break;
 311 
 312       case T_FLOAT:
 313       case T_BOOLEAN:
 314       case T_CHAR:
 315       case T_BYTE:
 316       case T_SHORT:
 317       case T_INT:
 318       case T_ADDRESS:
 319       case T_OBJECT:
 320       case T_INLINE_TYPE:
 321       case T_ARRAY:
 322       case T_METADATA:
 323         return single_size;
 324         break;
 325 
 326       default:
 327         ShouldNotReachHere();
 328         return single_size;
 329       }
 330   }
 331 
 332 
 333   void validate_type() const PRODUCT_RETURN;
 334 
 335   BasicType type() const {
 336     if (is_pointer()) {
 337       return pointer()->type();
 338     }
 339     return as_BasicType(type_field());
 340   }
 341 
 342 
 343   ValueType* value_type() const                  { return as_ValueType(type()); }
 344 
 345   char type_char() const                         { return type_char((is_pointer()) ? pointer()->type() : type()); }
 346 
 347   bool is_equal(LIR_Opr opr) const         { return this == opr; }
 348   // checks whether types are same
 349   bool is_same_type(LIR_Opr opr) const     {
 350     assert(type_field() != unknown_type &&
 351            opr->type_field() != unknown_type, "shouldn't see unknown_type");
 352     return type_field() == opr->type_field();
 353   }
 354   bool is_same_register(LIR_Opr opr) {
 355     return (is_register() && opr->is_register() &&
 356             kind_field() == opr->kind_field() &&
 357             (value() & no_type_mask) == (opr->value() & no_type_mask));
 358   }
 359 
 360   bool is_pointer() const      { return check_value_mask(pointer_mask, pointer_value); }
 361   bool is_illegal() const      { return kind_field() == illegal_value; }
 362   bool is_valid() const        { return kind_field() != illegal_value; }
 363 
 364   bool is_register() const     { return is_cpu_register() || is_fpu_register(); }
 365   bool is_virtual() const      { return is_virtual_cpu()  || is_virtual_fpu();  }
 366 
 367   bool is_constant() const     { return is_pointer() && pointer()->as_constant() != NULL; }
 368   bool is_address() const      { return is_pointer() && pointer()->as_address() != NULL; }
 369 
 370   bool is_float_kind() const   { return is_pointer() ? pointer()->is_float_kind() : (kind_field() == fpu_register); }
 371   bool is_oop() const;
 372 
 373   // semantic for fpu- and xmm-registers:
 374   // * is_float and is_double return true for xmm_registers
 375   //   (so is_single_fpu and is_single_xmm are true)
 376   // * So you must always check for is_???_xmm prior to is_???_fpu to
 377   //   distinguish between fpu- and xmm-registers
 378 
 379   bool is_stack() const        { validate_type(); return check_value_mask(kind_mask,                stack_value);                 }
 380   bool is_single_stack() const { validate_type(); return check_value_mask(kind_mask | size_mask,    stack_value  | single_size);  }
 381   bool is_double_stack() const { validate_type(); return check_value_mask(kind_mask | size_mask,    stack_value  | double_size);  }
 382 
 383   bool is_cpu_register() const { validate_type(); return check_value_mask(kind_mask,                cpu_register);                }
 384   bool is_virtual_cpu() const  { validate_type(); return check_value_mask(kind_mask | virtual_mask, cpu_register | virtual_mask); }
 385   bool is_fixed_cpu() const    { validate_type(); return check_value_mask(kind_mask | virtual_mask, cpu_register);                }
 386   bool is_single_cpu() const   { validate_type(); return check_value_mask(kind_mask | size_mask,    cpu_register | single_size);  }
 387   bool is_double_cpu() const   { validate_type(); return check_value_mask(kind_mask | size_mask,    cpu_register | double_size);  }
 388 
 389   bool is_fpu_register() const { validate_type(); return check_value_mask(kind_mask,                fpu_register);                }
 390   bool is_virtual_fpu() const  { validate_type(); return check_value_mask(kind_mask | virtual_mask, fpu_register | virtual_mask); }
 391   bool is_fixed_fpu() const    { validate_type(); return check_value_mask(kind_mask | virtual_mask, fpu_register);                }
 392   bool is_single_fpu() const   { validate_type(); return check_value_mask(kind_mask | size_mask,    fpu_register | single_size);  }
 393   bool is_double_fpu() const   { validate_type(); return check_value_mask(kind_mask | size_mask,    fpu_register | double_size);  }
 394 
 395   bool is_xmm_register() const { validate_type(); return check_value_mask(kind_mask | is_xmm_mask,             fpu_register | is_xmm_mask); }
 396   bool is_single_xmm() const   { validate_type(); return check_value_mask(kind_mask | size_mask | is_xmm_mask, fpu_register | single_size | is_xmm_mask); }
 397   bool is_double_xmm() const   { validate_type(); return check_value_mask(kind_mask | size_mask | is_xmm_mask, fpu_register | double_size | is_xmm_mask); }
 398 
 399   // fast accessor functions for special bits that do not work for pointers
 400   // (in this functions, the check for is_pointer() is omitted)
 401   bool is_single_word() const      { assert(is_register() || is_stack(), "type check"); return check_value_mask(size_mask, single_size); }
 402   bool is_double_word() const      { assert(is_register() || is_stack(), "type check"); return check_value_mask(size_mask, double_size); }
 403   bool is_virtual_register() const { assert(is_register(),               "type check"); return check_value_mask(virtual_mask, virtual_mask); }
 404   bool is_oop_register() const     { assert(is_register() || is_stack(), "type check"); return type_field_valid() == object_type; }
 405   BasicType type_register() const  { assert(is_register() || is_stack(), "type check"); return as_BasicType(type_field_valid());  }
 406 
 407   bool is_last_use() const         { assert(is_register(), "only works for registers"); return (value() & last_use_mask) != 0; }
 408   bool is_fpu_stack_offset() const { assert(is_register(), "only works for registers"); return (value() & is_fpu_stack_offset_mask) != 0; }
 409   LIR_Opr make_last_use()          { assert(is_register(), "only works for registers"); return (LIR_Opr)(value() | last_use_mask); }
 410   LIR_Opr make_fpu_stack_offset()  { assert(is_register(), "only works for registers"); return (LIR_Opr)(value() | is_fpu_stack_offset_mask); }
 411 
 412 
 413   int single_stack_ix() const  { assert(is_single_stack() && !is_virtual(), "type check"); return (int)data(); }
 414   int double_stack_ix() const  { assert(is_double_stack() && !is_virtual(), "type check"); return (int)data(); }
 415   RegNr cpu_regnr() const      { assert(is_single_cpu()   && !is_virtual(), "type check"); return (RegNr)data(); }
 416   RegNr cpu_regnrLo() const    { assert(is_double_cpu()   && !is_virtual(), "type check"); return (RegNr)lo_reg_half(); }
 417   RegNr cpu_regnrHi() const    { assert(is_double_cpu()   && !is_virtual(), "type check"); return (RegNr)hi_reg_half(); }
 418   RegNr fpu_regnr() const      { assert(is_single_fpu()   && !is_virtual(), "type check"); return (RegNr)data(); }
 419   RegNr fpu_regnrLo() const    { assert(is_double_fpu()   && !is_virtual(), "type check"); return (RegNr)lo_reg_half(); }
 420   RegNr fpu_regnrHi() const    { assert(is_double_fpu()   && !is_virtual(), "type check"); return (RegNr)hi_reg_half(); }
 421   RegNr xmm_regnr() const      { assert(is_single_xmm()   && !is_virtual(), "type check"); return (RegNr)data(); }
 422   RegNr xmm_regnrLo() const    { assert(is_double_xmm()   && !is_virtual(), "type check"); return (RegNr)lo_reg_half(); }
 423   RegNr xmm_regnrHi() const    { assert(is_double_xmm()   && !is_virtual(), "type check"); return (RegNr)hi_reg_half(); }
 424   int   vreg_number() const    { assert(is_virtual(),                       "type check"); return (RegNr)data(); }
 425 
 426   LIR_OprPtr* pointer()  const                   { assert(is_pointer(), "type check");      return (LIR_OprPtr*)this; }
 427   LIR_Const* as_constant_ptr() const             { return pointer()->as_constant(); }
 428   LIR_Address* as_address_ptr() const            { return pointer()->as_address(); }
 429 
 430   Register as_register()    const;
 431   Register as_register_lo() const;
 432   Register as_register_hi() const;
 433 
 434   Register as_pointer_register() {
 435 #ifdef _LP64
 436     if (is_double_cpu()) {
 437       assert(as_register_lo() == as_register_hi(), "should be a single register");
 438       return as_register_lo();
 439     }
 440 #endif
 441     return as_register();
 442   }
 443 
 444   FloatRegister as_float_reg   () const;
 445   FloatRegister as_double_reg  () const;
 446 #ifdef X86
 447   XMMRegister as_xmm_float_reg () const;
 448   XMMRegister as_xmm_double_reg() const;
 449   // for compatibility with RInfo
 450   int fpu() const { return lo_reg_half(); }
 451 #endif
 452 
 453   jint      as_jint()    const { return as_constant_ptr()->as_jint(); }
 454   jlong     as_jlong()   const { return as_constant_ptr()->as_jlong(); }
 455   jfloat    as_jfloat()  const { return as_constant_ptr()->as_jfloat(); }
 456   jdouble   as_jdouble() const { return as_constant_ptr()->as_jdouble(); }
 457   jobject   as_jobject() const { return as_constant_ptr()->as_jobject(); }
 458 
 459   void print() const PRODUCT_RETURN;
 460   void print(outputStream* out) const PRODUCT_RETURN;
 461 };
 462 
 463 
 464 inline LIR_OprDesc::OprType as_OprType(BasicType type) {
 465   switch (type) {
 466   case T_INT:      return LIR_OprDesc::int_type;
 467   case T_LONG:     return LIR_OprDesc::long_type;
 468   case T_FLOAT:    return LIR_OprDesc::float_type;
 469   case T_DOUBLE:   return LIR_OprDesc::double_type;
 470   case T_OBJECT:
 471   case T_INLINE_TYPE:
 472   case T_ARRAY:    return LIR_OprDesc::object_type;
 473   case T_ADDRESS:  return LIR_OprDesc::address_type;
 474   case T_METADATA: return LIR_OprDesc::metadata_type;
 475   case T_ILLEGAL:  // fall through
 476   default: ShouldNotReachHere(); return LIR_OprDesc::unknown_type;
 477   }
 478 }
 479 
 480 inline BasicType as_BasicType(LIR_OprDesc::OprType t) {
 481   switch (t) {
 482   case LIR_OprDesc::int_type:     return T_INT;
 483   case LIR_OprDesc::long_type:    return T_LONG;
 484   case LIR_OprDesc::float_type:   return T_FLOAT;
 485   case LIR_OprDesc::double_type:  return T_DOUBLE;
 486   case LIR_OprDesc::object_type:  return T_OBJECT;
 487   case LIR_OprDesc::address_type: return T_ADDRESS;
 488   case LIR_OprDesc::metadata_type:return T_METADATA;
 489   case LIR_OprDesc::unknown_type: // fall through
 490   default: ShouldNotReachHere();  return T_ILLEGAL;
 491   }
 492 }
 493 
 494 
 495 // LIR_Address
 496 class LIR_Address: public LIR_OprPtr {
 497  friend class LIR_OpVisitState;
 498 
 499  public:
 500   // NOTE: currently these must be the log2 of the scale factor (and
 501   // must also be equivalent to the ScaleFactor enum in
 502   // assembler_i486.hpp)
 503   enum Scale {
 504     times_1  =  0,
 505     times_2  =  1,
 506     times_4  =  2,
 507     times_8  =  3
 508   };
 509 
 510  private:
 511   LIR_Opr   _base;
 512   LIR_Opr   _index;
 513   Scale     _scale;
 514   intx      _disp;
 515   BasicType _type;
 516 
 517  public:
 518   LIR_Address(LIR_Opr base, LIR_Opr index, BasicType type):
 519        _base(base)
 520      , _index(index)
 521      , _scale(times_1)
 522      , _disp(0)
 523      , _type(type) { verify(); }
 524 
 525   LIR_Address(LIR_Opr base, intx disp, BasicType type):
 526        _base(base)
 527      , _index(LIR_OprDesc::illegalOpr())
 528      , _scale(times_1)
 529      , _disp(disp)
 530      , _type(type) { verify(); }
 531 
 532   LIR_Address(LIR_Opr base, BasicType type):
 533        _base(base)
 534      , _index(LIR_OprDesc::illegalOpr())
 535      , _scale(times_1)
 536      , _disp(0)
 537      , _type(type) { verify(); }
 538 
 539   LIR_Address(LIR_Opr base, LIR_Opr index, intx disp, BasicType type):
 540        _base(base)
 541      , _index(index)
 542      , _scale(times_1)
 543      , _disp(disp)
 544      , _type(type) { verify(); }
 545 
 546   LIR_Address(LIR_Opr base, LIR_Opr index, Scale scale, intx disp, BasicType type):
 547        _base(base)
 548      , _index(index)
 549      , _scale(scale)
 550      , _disp(disp)
 551      , _type(type) { verify(); }
 552 
 553   LIR_Opr base()  const                          { return _base;  }
 554   LIR_Opr index() const                          { return _index; }
 555   Scale   scale() const                          { return _scale; }
 556   intx    disp()  const                          { return _disp;  }
 557 
 558   bool equals(LIR_Address* other) const          { return base() == other->base() && index() == other->index() && disp() == other->disp() && scale() == other->scale(); }
 559 
 560   virtual LIR_Address* as_address()              { return this;   }
 561   virtual BasicType type() const                 { return _type; }
 562   virtual void print_value_on(outputStream* out) const PRODUCT_RETURN;
 563 
 564   void verify() const PRODUCT_RETURN;
 565 
 566   static Scale scale(BasicType type);
 567 };
 568 
 569 
 570 // operand factory
 571 class LIR_OprFact: public AllStatic {
 572  public:
 573 
 574   static LIR_Opr illegalOpr;
 575 
 576   static LIR_Opr single_cpu(int reg) {
 577     return (LIR_Opr)(intptr_t)((reg  << LIR_OprDesc::reg1_shift) |
 578                                LIR_OprDesc::int_type             |
 579                                LIR_OprDesc::cpu_register         |
 580                                LIR_OprDesc::single_size);
 581   }
 582   static LIR_Opr single_cpu_oop(int reg) {
 583     return (LIR_Opr)(intptr_t)((reg  << LIR_OprDesc::reg1_shift) |
 584                                LIR_OprDesc::object_type          |
 585                                LIR_OprDesc::cpu_register         |
 586                                LIR_OprDesc::single_size);
 587   }
 588   static LIR_Opr single_cpu_address(int reg) {
 589     return (LIR_Opr)(intptr_t)((reg  << LIR_OprDesc::reg1_shift) |
 590                                LIR_OprDesc::address_type         |
 591                                LIR_OprDesc::cpu_register         |
 592                                LIR_OprDesc::single_size);
 593   }
 594   static LIR_Opr single_cpu_metadata(int reg) {
 595     return (LIR_Opr)(intptr_t)((reg  << LIR_OprDesc::reg1_shift) |
 596                                LIR_OprDesc::metadata_type        |
 597                                LIR_OprDesc::cpu_register         |
 598                                LIR_OprDesc::single_size);
 599   }
 600   static LIR_Opr double_cpu(int reg1, int reg2) {
 601     LP64_ONLY(assert(reg1 == reg2, "must be identical"));
 602     return (LIR_Opr)(intptr_t)((reg1 << LIR_OprDesc::reg1_shift) |
 603                                (reg2 << LIR_OprDesc::reg2_shift) |
 604                                LIR_OprDesc::long_type            |
 605                                LIR_OprDesc::cpu_register         |
 606                                LIR_OprDesc::double_size);
 607   }
 608 
 609   static LIR_Opr single_fpu(int reg) {
 610     return (LIR_Opr)(intptr_t)((reg  << LIR_OprDesc::reg1_shift) |
 611                                LIR_OprDesc::float_type           |
 612                                LIR_OprDesc::fpu_register         |
 613                                LIR_OprDesc::single_size);
 614   }
 615 
 616   // Platform dependant.
 617   static LIR_Opr double_fpu(int reg1, int reg2 = -1 /*fnoreg*/);
 618 
 619 #ifdef ARM32
 620   static LIR_Opr single_softfp(int reg) {
 621     return (LIR_Opr)(intptr_t)((reg  << LIR_OprDesc::reg1_shift) |
 622                                LIR_OprDesc::float_type           |
 623                                LIR_OprDesc::cpu_register         |
 624                                LIR_OprDesc::single_size);
 625   }
 626   static LIR_Opr double_softfp(int reg1, int reg2) {
 627     return (LIR_Opr)(intptr_t)((reg1 << LIR_OprDesc::reg1_shift) |
 628                                (reg2 << LIR_OprDesc::reg2_shift) |
 629                                LIR_OprDesc::double_type          |
 630                                LIR_OprDesc::cpu_register         |
 631                                LIR_OprDesc::double_size);
 632   }
 633 #endif // ARM32
 634 
 635 #if defined(X86)
 636   static LIR_Opr single_xmm(int reg) {
 637     return (LIR_Opr)(intptr_t)((reg << LIR_OprDesc::reg1_shift) |
 638                                LIR_OprDesc::float_type          |
 639                                LIR_OprDesc::fpu_register        |
 640                                LIR_OprDesc::single_size         |
 641                                LIR_OprDesc::is_xmm_mask);
 642   }
 643   static LIR_Opr double_xmm(int reg) {
 644     return (LIR_Opr)(intptr_t)((reg << LIR_OprDesc::reg1_shift) |
 645                                (reg << LIR_OprDesc::reg2_shift) |
 646                                LIR_OprDesc::double_type         |
 647                                LIR_OprDesc::fpu_register        |
 648                                LIR_OprDesc::double_size         |
 649                                LIR_OprDesc::is_xmm_mask);
 650   }
 651 #endif // X86
 652 
 653   static LIR_Opr virtual_register(int index, BasicType type) {
 654     if (index > LIR_OprDesc::vreg_max) {
 655       // Running out of virtual registers. Caller should bailout.
 656       return illegalOpr;
 657     }
 658 
 659     LIR_Opr res;
 660     switch (type) {
 661       case T_OBJECT: // fall through
 662       case T_INLINE_TYPE: // fall through
 663       case T_ARRAY:
 664         res = (LIR_Opr)(intptr_t)((index << LIR_OprDesc::data_shift)  |
 665                                             LIR_OprDesc::object_type  |
 666                                             LIR_OprDesc::cpu_register |
 667                                             LIR_OprDesc::single_size  |
 668                                             LIR_OprDesc::virtual_mask);
 669         break;
 670 
 671       case T_METADATA:
 672         res = (LIR_Opr)(intptr_t)((index << LIR_OprDesc::data_shift)  |
 673                                             LIR_OprDesc::metadata_type|
 674                                             LIR_OprDesc::cpu_register |
 675                                             LIR_OprDesc::single_size  |
 676                                             LIR_OprDesc::virtual_mask);
 677         break;
 678 
 679       case T_INT:
 680         res = (LIR_Opr)(intptr_t)((index << LIR_OprDesc::data_shift) |
 681                                   LIR_OprDesc::int_type              |
 682                                   LIR_OprDesc::cpu_register          |
 683                                   LIR_OprDesc::single_size           |
 684                                   LIR_OprDesc::virtual_mask);
 685         break;
 686 
 687       case T_ADDRESS:
 688         res = (LIR_Opr)(intptr_t)((index << LIR_OprDesc::data_shift) |
 689                                   LIR_OprDesc::address_type          |
 690                                   LIR_OprDesc::cpu_register          |
 691                                   LIR_OprDesc::single_size           |
 692                                   LIR_OprDesc::virtual_mask);
 693         break;
 694 
 695       case T_LONG:
 696         res = (LIR_Opr)(intptr_t)((index << LIR_OprDesc::data_shift) |
 697                                   LIR_OprDesc::long_type             |
 698                                   LIR_OprDesc::cpu_register          |
 699                                   LIR_OprDesc::double_size           |
 700                                   LIR_OprDesc::virtual_mask);
 701         break;
 702 
 703 #ifdef __SOFTFP__
 704       case T_FLOAT:
 705         res = (LIR_Opr)(intptr_t)((index << LIR_OprDesc::data_shift) |
 706                                   LIR_OprDesc::float_type  |
 707                                   LIR_OprDesc::cpu_register |
 708                                   LIR_OprDesc::single_size |
 709                                   LIR_OprDesc::virtual_mask);
 710         break;
 711       case T_DOUBLE:
 712         res = (LIR_Opr)(intptr_t)((index << LIR_OprDesc::data_shift) |
 713                                   LIR_OprDesc::double_type |
 714                                   LIR_OprDesc::cpu_register |
 715                                   LIR_OprDesc::double_size |
 716                                   LIR_OprDesc::virtual_mask);
 717         break;
 718 #else // __SOFTFP__
 719       case T_FLOAT:
 720         res = (LIR_Opr)(intptr_t)((index << LIR_OprDesc::data_shift) |
 721                                   LIR_OprDesc::float_type           |
 722                                   LIR_OprDesc::fpu_register         |
 723                                   LIR_OprDesc::single_size          |
 724                                   LIR_OprDesc::virtual_mask);
 725         break;
 726 
 727       case
 728         T_DOUBLE: res = (LIR_Opr)(intptr_t)((index << LIR_OprDesc::data_shift) |
 729                                             LIR_OprDesc::double_type           |
 730                                             LIR_OprDesc::fpu_register          |
 731                                             LIR_OprDesc::double_size           |
 732                                             LIR_OprDesc::virtual_mask);
 733         break;
 734 #endif // __SOFTFP__
 735       default:       ShouldNotReachHere(); res = illegalOpr;
 736     }
 737 
 738 #ifdef ASSERT
 739     res->validate_type();
 740     assert(res->vreg_number() == index, "conversion check");
 741     assert(index >= LIR_OprDesc::vreg_base, "must start at vreg_base");
 742     assert(index <= (max_jint >> LIR_OprDesc::data_shift), "index is too big");
 743 
 744     // old-style calculation; check if old and new method are equal
 745     LIR_OprDesc::OprType t = as_OprType(type);
 746 #ifdef __SOFTFP__
 747     LIR_Opr old_res = (LIR_Opr)(intptr_t)((index << LIR_OprDesc::data_shift) |
 748                                t |
 749                                LIR_OprDesc::cpu_register |
 750                                LIR_OprDesc::size_for(type) | LIR_OprDesc::virtual_mask);
 751 #else // __SOFTFP__
 752     LIR_Opr old_res = (LIR_Opr)(intptr_t)((index << LIR_OprDesc::data_shift) | t |
 753                                           ((type == T_FLOAT || type == T_DOUBLE) ?  LIR_OprDesc::fpu_register : LIR_OprDesc::cpu_register) |
 754                                LIR_OprDesc::size_for(type) | LIR_OprDesc::virtual_mask);
 755     assert(res == old_res, "old and new method not equal");
 756 #endif // __SOFTFP__
 757 #endif // ASSERT
 758 
 759     return res;
 760   }
 761 
 762   // 'index' is computed by FrameMap::local_stack_pos(index); do not use other parameters as
 763   // the index is platform independent; a double stack useing indeces 2 and 3 has always
 764   // index 2.
 765   static LIR_Opr stack(int index, BasicType type) {
 766     LIR_Opr res;
 767     switch (type) {
 768       case T_INLINE_TYPE: // fall through
 769       case T_OBJECT: // fall through
 770       case T_ARRAY:
 771         res = (LIR_Opr)(intptr_t)((index << LIR_OprDesc::data_shift) |
 772                                   LIR_OprDesc::object_type           |
 773                                   LIR_OprDesc::stack_value           |
 774                                   LIR_OprDesc::single_size);
 775         break;
 776 
 777       case T_METADATA:
 778         res = (LIR_Opr)(intptr_t)((index << LIR_OprDesc::data_shift) |
 779                                   LIR_OprDesc::metadata_type         |
 780                                   LIR_OprDesc::stack_value           |
 781                                   LIR_OprDesc::single_size);
 782         break;
 783       case T_INT:
 784         res = (LIR_Opr)(intptr_t)((index << LIR_OprDesc::data_shift) |
 785                                   LIR_OprDesc::int_type              |
 786                                   LIR_OprDesc::stack_value           |
 787                                   LIR_OprDesc::single_size);
 788         break;
 789 
 790       case T_ADDRESS:
 791         res = (LIR_Opr)(intptr_t)((index << LIR_OprDesc::data_shift) |
 792                                   LIR_OprDesc::address_type          |
 793                                   LIR_OprDesc::stack_value           |
 794                                   LIR_OprDesc::single_size);
 795         break;
 796 
 797       case T_LONG:
 798         res = (LIR_Opr)(intptr_t)((index << LIR_OprDesc::data_shift) |
 799                                   LIR_OprDesc::long_type             |
 800                                   LIR_OprDesc::stack_value           |
 801                                   LIR_OprDesc::double_size);
 802         break;
 803 
 804       case T_FLOAT:
 805         res = (LIR_Opr)(intptr_t)((index << LIR_OprDesc::data_shift) |
 806                                   LIR_OprDesc::float_type            |
 807                                   LIR_OprDesc::stack_value           |
 808                                   LIR_OprDesc::single_size);
 809         break;
 810       case T_DOUBLE:
 811         res = (LIR_Opr)(intptr_t)((index << LIR_OprDesc::data_shift) |
 812                                   LIR_OprDesc::double_type           |
 813                                   LIR_OprDesc::stack_value           |
 814                                   LIR_OprDesc::double_size);
 815         break;
 816 
 817       default:       ShouldNotReachHere(); res = illegalOpr;
 818     }
 819 
 820 #ifdef ASSERT
 821     assert(index >= 0, "index must be positive");
 822     assert(index <= (max_jint >> LIR_OprDesc::data_shift), "index is too big");
 823 
 824     LIR_Opr old_res = (LIR_Opr)(intptr_t)((index << LIR_OprDesc::data_shift) |
 825                                           LIR_OprDesc::stack_value           |
 826                                           as_OprType(type)                   |
 827                                           LIR_OprDesc::size_for(type));
 828     assert(res == old_res, "old and new method not equal");
 829 #endif
 830 
 831     return res;
 832   }
 833 
 834   static LIR_Opr intConst(jint i)                { return (LIR_Opr)(new LIR_Const(i)); }
 835   static LIR_Opr longConst(jlong l)              { return (LIR_Opr)(new LIR_Const(l)); }
 836   static LIR_Opr floatConst(jfloat f)            { return (LIR_Opr)(new LIR_Const(f)); }
 837   static LIR_Opr doubleConst(jdouble d)          { return (LIR_Opr)(new LIR_Const(d)); }
 838   static LIR_Opr oopConst(jobject o)             { return (LIR_Opr)(new LIR_Const(o)); }
 839   static LIR_Opr address(LIR_Address* a)         { return (LIR_Opr)a; }
 840   static LIR_Opr intptrConst(void* p)            { return (LIR_Opr)(new LIR_Const(p)); }
 841   static LIR_Opr intptrConst(intptr_t v)         { return (LIR_Opr)(new LIR_Const((void*)v)); }
 842   static LIR_Opr illegal()                       { return (LIR_Opr)-1; }
 843   static LIR_Opr addressConst(jint i)            { return (LIR_Opr)(new LIR_Const(i, true)); }
 844   static LIR_Opr metadataConst(Metadata* m)      { return (LIR_Opr)(new LIR_Const(m)); }
 845 
 846   static LIR_Opr value_type(ValueType* type);
 847 };
 848 
 849 
 850 //-------------------------------------------------------------------------------
 851 //                   LIR Instructions
 852 //-------------------------------------------------------------------------------
 853 //
 854 // Note:
 855 //  - every instruction has a result operand
 856 //  - every instruction has an CodeEmitInfo operand (can be revisited later)
 857 //  - every instruction has a LIR_OpCode operand
 858 //  - LIR_OpN, means an instruction that has N input operands
 859 //
 860 // class hierarchy:
 861 //
 862 class  LIR_Op;
 863 class    LIR_Op0;
 864 class      LIR_OpLabel;
 865 class    LIR_Op1;
 866 class      LIR_OpBranch;
 867 class      LIR_OpConvert;
 868 class      LIR_OpAllocObj;
 869 class      LIR_OpReturn;
 870 class      LIR_OpRoundFP;
 871 class    LIR_Op2;
 872 class    LIR_OpDelay;
 873 class    LIR_Op3;
 874 class      LIR_OpAllocArray;
 875 class    LIR_OpCall;
 876 class      LIR_OpJavaCall;
 877 class      LIR_OpRTCall;
 878 class    LIR_OpArrayCopy;
 879 class    LIR_OpUpdateCRC32;
 880 class    LIR_OpLock;
 881 class    LIR_OpTypeCheck;
 882 class    LIR_OpFlattenedArrayCheck;
 883 class    LIR_OpNullFreeArrayCheck;
 884 class    LIR_OpSubstitutabilityCheck;
 885 class    LIR_OpCompareAndSwap;
 886 class    LIR_OpProfileCall;
 887 class    LIR_OpProfileType;
 888 class    LIR_OpProfileInlineType;
 889 #ifdef ASSERT
 890 class    LIR_OpAssert;
 891 #endif
 892 
 893 // LIR operation codes
 894 enum LIR_Code {
 895     lir_none
 896   , begin_op0
 897       , lir_label
 898       , lir_nop
 899       , lir_std_entry
 900       , lir_osr_entry
 901       , lir_fpop_raw
 902       , lir_breakpoint
 903       , lir_rtcall
 904       , lir_membar
 905       , lir_membar_acquire
 906       , lir_membar_release
 907       , lir_membar_loadload
 908       , lir_membar_storestore
 909       , lir_membar_loadstore
 910       , lir_membar_storeload
 911       , lir_get_thread
 912       , lir_on_spin_wait
 913       , lir_check_orig_pc
 914   , end_op0
 915   , begin_op1
 916       , lir_fxch
 917       , lir_fld
 918       , lir_push
 919       , lir_pop
 920       , lir_null_check
 921       , lir_return
 922       , lir_leal
 923       , lir_branch
 924       , lir_cond_float_branch
 925       , lir_move
 926       , lir_convert
 927       , lir_alloc_object
 928       , lir_monaddr
 929       , lir_roundfp
 930       , lir_safepoint
 931       , lir_unwind
 932   , end_op1
 933   , begin_op2
 934       , lir_cmp
 935       , lir_cmp_l2i
 936       , lir_ucmp_fd2i
 937       , lir_cmp_fd2i
 938       , lir_cmove
 939       , lir_add
 940       , lir_sub
 941       , lir_mul
 942       , lir_div
 943       , lir_rem
 944       , lir_sqrt
 945       , lir_abs
 946       , lir_neg
 947       , lir_tan
 948       , lir_log10
 949       , lir_logic_and
 950       , lir_logic_or
 951       , lir_logic_xor
 952       , lir_shl
 953       , lir_shr
 954       , lir_ushr
 955       , lir_alloc_array
 956       , lir_throw
 957       , lir_xadd
 958       , lir_xchg
 959   , end_op2
 960   , begin_op3
 961       , lir_idiv
 962       , lir_irem
 963       , lir_fmad
 964       , lir_fmaf
 965   , end_op3
 966   , begin_opJavaCall
 967       , lir_static_call
 968       , lir_optvirtual_call
 969       , lir_icvirtual_call
 970       , lir_dynamic_call
 971   , end_opJavaCall
 972   , begin_opArrayCopy
 973       , lir_arraycopy
 974   , end_opArrayCopy
 975   , begin_opUpdateCRC32
 976       , lir_updatecrc32
 977   , end_opUpdateCRC32
 978   , begin_opLock
 979     , lir_lock
 980     , lir_unlock
 981   , end_opLock
 982   , begin_delay_slot
 983     , lir_delay_slot
 984   , end_delay_slot
 985   , begin_opTypeCheck
 986     , lir_instanceof
 987     , lir_checkcast
 988     , lir_store_check
 989   , end_opTypeCheck
 990   , begin_opFlattenedArrayCheck
 991     , lir_flattened_array_check
 992   , end_opFlattenedArrayCheck
 993   , begin_opNullFreeArrayCheck
 994     , lir_null_free_array_check
 995   , end_opNullFreeArrayCheck
 996   , begin_opSubstitutabilityCheck
 997     , lir_substitutability_check
 998   , end_opSubstitutabilityCheck
 999   , begin_opCompareAndSwap
1000     , lir_cas_long
1001     , lir_cas_obj
1002     , lir_cas_int
1003   , end_opCompareAndSwap
1004   , begin_opMDOProfile
1005     , lir_profile_call
1006     , lir_profile_type
1007     , lir_profile_inline_type
1008   , end_opMDOProfile
1009   , begin_opAssert
1010     , lir_assert
1011   , end_opAssert
1012 };
1013 
1014 
1015 enum LIR_Condition {
1016     lir_cond_equal
1017   , lir_cond_notEqual
1018   , lir_cond_less
1019   , lir_cond_lessEqual
1020   , lir_cond_greaterEqual
1021   , lir_cond_greater
1022   , lir_cond_belowEqual
1023   , lir_cond_aboveEqual
1024   , lir_cond_always
1025   , lir_cond_unknown = -1
1026 };
1027 
1028 
1029 enum LIR_PatchCode {
1030   lir_patch_none,
1031   lir_patch_low,
1032   lir_patch_high,
1033   lir_patch_normal
1034 };
1035 
1036 
1037 enum LIR_MoveKind {
1038   lir_move_normal,
1039   lir_move_volatile,
1040   lir_move_wide,
1041   lir_move_max_flag
1042 };
1043 
1044 
1045 // --------------------------------------------------
1046 // LIR_Op
1047 // --------------------------------------------------
1048 class LIR_Op: public CompilationResourceObj {
1049  friend class LIR_OpVisitState;
1050 
1051 #ifdef ASSERT
1052  private:
1053   const char *  _file;
1054   int           _line;
1055 #endif
1056 
1057  protected:
1058   LIR_Opr       _result;
1059   unsigned short _code;
1060   unsigned short _flags;
1061   CodeEmitInfo* _info;
1062   int           _id;     // value id for register allocation
1063   int           _fpu_pop_count;
1064   Instruction*  _source; // for debugging
1065 
1066   static void print_condition(outputStream* out, LIR_Condition cond) PRODUCT_RETURN;
1067 
1068  protected:
1069   static bool is_in_range(LIR_Code test, LIR_Code start, LIR_Code end)  { return start < test && test < end; }
1070 
1071  public:
1072   LIR_Op()
1073     :
1074 #ifdef ASSERT
1075       _file(NULL)
1076     , _line(0),
1077 #endif
1078       _result(LIR_OprFact::illegalOpr)
1079     , _code(lir_none)
1080     , _flags(0)
1081     , _info(NULL)
1082     , _id(-1)
1083     , _fpu_pop_count(0)
1084     , _source(NULL) {}
1085 
1086   LIR_Op(LIR_Code code, LIR_Opr result, CodeEmitInfo* info)
1087     :
1088 #ifdef ASSERT
1089       _file(NULL)
1090     , _line(0),
1091 #endif
1092       _result(result)
1093     , _code(code)
1094     , _flags(0)
1095     , _info(info)
1096     , _id(-1)
1097     , _fpu_pop_count(0)
1098     , _source(NULL) {}
1099 
1100   CodeEmitInfo* info() const                  { return _info;   }
1101   LIR_Code code()      const                  { return (LIR_Code)_code;   }
1102   LIR_Opr result_opr() const                  { return _result; }
1103   void    set_result_opr(LIR_Opr opr)         { _result = opr;  }
1104 
1105 #ifdef ASSERT
1106   void set_file_and_line(const char * file, int line) {
1107     _file = file;
1108     _line = line;
1109   }
1110 #endif
1111 
1112   virtual const char * name() const PRODUCT_RETURN0;
1113   virtual void visit(LIR_OpVisitState* state);
1114 
1115   int id()             const                  { return _id;     }
1116   void set_id(int id)                         { _id = id; }
1117 
1118   // FPU stack simulation helpers -- only used on Intel
1119   void set_fpu_pop_count(int count)           { assert(count >= 0 && count <= 1, "currently only 0 and 1 are valid"); _fpu_pop_count = count; }
1120   int  fpu_pop_count() const                  { return _fpu_pop_count; }
1121   bool pop_fpu_stack()                        { return _fpu_pop_count > 0; }
1122 
1123   Instruction* source() const                 { return _source; }
1124   void set_source(Instruction* ins)           { _source = ins; }
1125 
1126   virtual void emit_code(LIR_Assembler* masm) = 0;
1127   virtual void print_instr(outputStream* out) const   = 0;
1128   virtual void print_on(outputStream* st) const PRODUCT_RETURN;
1129 
1130   virtual bool is_patching() { return false; }
1131   virtual LIR_OpCall* as_OpCall() { return NULL; }
1132   virtual LIR_OpJavaCall* as_OpJavaCall() { return NULL; }
1133   virtual LIR_OpLabel* as_OpLabel() { return NULL; }
1134   virtual LIR_OpDelay* as_OpDelay() { return NULL; }
1135   virtual LIR_OpLock* as_OpLock() { return NULL; }
1136   virtual LIR_OpAllocArray* as_OpAllocArray() { return NULL; }
1137   virtual LIR_OpAllocObj* as_OpAllocObj() { return NULL; }
1138   virtual LIR_OpRoundFP* as_OpRoundFP() { return NULL; }
1139   virtual LIR_OpBranch* as_OpBranch() { return NULL; }
1140   virtual LIR_OpReturn* as_OpReturn() { return NULL; }
1141   virtual LIR_OpRTCall* as_OpRTCall() { return NULL; }
1142   virtual LIR_OpConvert* as_OpConvert() { return NULL; }
1143   virtual LIR_Op0* as_Op0() { return NULL; }
1144   virtual LIR_Op1* as_Op1() { return NULL; }
1145   virtual LIR_Op2* as_Op2() { return NULL; }
1146   virtual LIR_Op3* as_Op3() { return NULL; }
1147   virtual LIR_OpArrayCopy* as_OpArrayCopy() { return NULL; }
1148   virtual LIR_OpUpdateCRC32* as_OpUpdateCRC32() { return NULL; }
1149   virtual LIR_OpTypeCheck* as_OpTypeCheck() { return NULL; }
1150   virtual LIR_OpFlattenedArrayCheck* as_OpFlattenedArrayCheck() { return NULL; }
1151   virtual LIR_OpNullFreeArrayCheck* as_OpNullFreeArrayCheck() { return NULL; }
1152   virtual LIR_OpSubstitutabilityCheck* as_OpSubstitutabilityCheck() { return NULL; }
1153   virtual LIR_OpCompareAndSwap* as_OpCompareAndSwap() { return NULL; }
1154   virtual LIR_OpProfileCall* as_OpProfileCall() { return NULL; }
1155   virtual LIR_OpProfileType* as_OpProfileType() { return NULL; }
1156   virtual LIR_OpProfileInlineType* as_OpProfileInlineType() { return NULL; }
1157 #ifdef ASSERT
1158   virtual LIR_OpAssert* as_OpAssert() { return NULL; }
1159 #endif
1160 
1161   virtual void verify() const {}
1162 };
1163 
1164 // for calls
1165 class LIR_OpCall: public LIR_Op {
1166  friend class LIR_OpVisitState;
1167 
1168  protected:
1169   address      _addr;
1170   LIR_OprList* _arguments;
1171  protected:
1172   LIR_OpCall(LIR_Code code, address addr, LIR_Opr result,
1173              LIR_OprList* arguments, CodeEmitInfo* info = NULL)
1174     : LIR_Op(code, result, info)
1175     , _addr(addr)
1176     , _arguments(arguments) {}
1177 
1178  public:
1179   address addr() const                           { return _addr; }
1180   const LIR_OprList* arguments() const           { return _arguments; }
1181   virtual LIR_OpCall* as_OpCall()                { return this; }
1182 };
1183 
1184 
1185 // --------------------------------------------------
1186 // LIR_OpJavaCall
1187 // --------------------------------------------------
1188 class LIR_OpJavaCall: public LIR_OpCall {
1189  friend class LIR_OpVisitState;
1190 
1191  private:
1192   ciMethod* _method;
1193   LIR_Opr   _receiver;
1194   LIR_Opr   _method_handle_invoke_SP_save_opr;  // Used in LIR_OpVisitState::visit to store the reference to FrameMap::method_handle_invoke_SP_save_opr.
1195 
1196  public:
1197   LIR_OpJavaCall(LIR_Code code, ciMethod* method,
1198                  LIR_Opr receiver, LIR_Opr result,
1199                  address addr, LIR_OprList* arguments,
1200                  CodeEmitInfo* info)
1201   : LIR_OpCall(code, addr, result, arguments, info)
1202   , _method(method)
1203   , _receiver(receiver)
1204   , _method_handle_invoke_SP_save_opr(LIR_OprFact::illegalOpr)
1205   { assert(is_in_range(code, begin_opJavaCall, end_opJavaCall), "code check"); }
1206 
1207   LIR_OpJavaCall(LIR_Code code, ciMethod* method,
1208                  LIR_Opr receiver, LIR_Opr result, intptr_t vtable_offset,
1209                  LIR_OprList* arguments, CodeEmitInfo* info)
1210   : LIR_OpCall(code, (address)vtable_offset, result, arguments, info)
1211   , _method(method)
1212   , _receiver(receiver)
1213   , _method_handle_invoke_SP_save_opr(LIR_OprFact::illegalOpr)
1214   { assert(is_in_range(code, begin_opJavaCall, end_opJavaCall), "code check"); }
1215 
1216   LIR_Opr receiver() const                       { return _receiver; }
1217   ciMethod* method() const                       { return _method;   }
1218 
1219   // JSR 292 support.
1220   bool is_invokedynamic() const                  { return code() == lir_dynamic_call; }
1221   bool is_method_handle_invoke() const {
1222     return method()->is_compiled_lambda_form() ||   // Java-generated lambda form
1223            method()->is_method_handle_intrinsic();  // JVM-generated MH intrinsic
1224   }
1225 
1226   virtual void emit_code(LIR_Assembler* masm);
1227   virtual LIR_OpJavaCall* as_OpJavaCall() { return this; }
1228   virtual void print_instr(outputStream* out) const PRODUCT_RETURN;
1229 
1230   bool maybe_return_as_fields(ciInlineKlass** vk = NULL) const;
1231 };
1232 
1233 // --------------------------------------------------
1234 // LIR_OpLabel
1235 // --------------------------------------------------
1236 // Location where a branch can continue
1237 class LIR_OpLabel: public LIR_Op {
1238  friend class LIR_OpVisitState;
1239 
1240  private:
1241   Label* _label;
1242  public:
1243   LIR_OpLabel(Label* lbl)
1244    : LIR_Op(lir_label, LIR_OprFact::illegalOpr, NULL)
1245    , _label(lbl)                                 {}
1246   Label* label() const                           { return _label; }
1247 
1248   virtual void emit_code(LIR_Assembler* masm);
1249   virtual LIR_OpLabel* as_OpLabel() { return this; }
1250   virtual void print_instr(outputStream* out) const PRODUCT_RETURN;
1251 };
1252 
1253 // LIR_OpArrayCopy
1254 class LIR_OpArrayCopy: public LIR_Op {
1255  friend class LIR_OpVisitState;
1256 
1257  private:
1258   ArrayCopyStub*  _stub;
1259   LIR_Opr   _src;
1260   LIR_Opr   _src_pos;
1261   LIR_Opr   _dst;
1262   LIR_Opr   _dst_pos;
1263   LIR_Opr   _length;
1264   LIR_Opr   _tmp;
1265   ciArrayKlass* _expected_type;
1266   int       _flags;
1267 
1268 public:
1269   enum Flags {
1270     src_null_check         = 1 << 0,
1271     dst_null_check         = 1 << 1,
1272     src_pos_positive_check = 1 << 2,
1273     dst_pos_positive_check = 1 << 3,
1274     length_positive_check  = 1 << 4,
1275     src_range_check        = 1 << 5,
1276     dst_range_check        = 1 << 6,
1277     type_check             = 1 << 7,
1278     overlapping            = 1 << 8,
1279     unaligned              = 1 << 9,
1280     src_objarray           = 1 << 10,
1281     dst_objarray           = 1 << 11,
1282     always_slow_path       = 1 << 12,
1283     src_inlinetype_check   = 1 << 13,
1284     dst_inlinetype_check   = 1 << 14,
1285     all_flags              = (1 << 15) - 1
1286   };
1287 
1288   LIR_OpArrayCopy(LIR_Opr src, LIR_Opr src_pos, LIR_Opr dst, LIR_Opr dst_pos, LIR_Opr length, LIR_Opr tmp,
1289                   ciArrayKlass* expected_type, int flags, CodeEmitInfo* info);
1290 
1291   LIR_Opr src() const                            { return _src; }
1292   LIR_Opr src_pos() const                        { return _src_pos; }
1293   LIR_Opr dst() const                            { return _dst; }
1294   LIR_Opr dst_pos() const                        { return _dst_pos; }
1295   LIR_Opr length() const                         { return _length; }
1296   LIR_Opr tmp() const                            { return _tmp; }
1297   int flags() const                              { return _flags; }
1298   ciArrayKlass* expected_type() const            { return _expected_type; }
1299   ArrayCopyStub* stub() const                    { return _stub; }
1300 
1301   virtual void emit_code(LIR_Assembler* masm);
1302   virtual LIR_OpArrayCopy* as_OpArrayCopy() { return this; }
1303   void print_instr(outputStream* out) const PRODUCT_RETURN;
1304 };
1305 
1306 // LIR_OpUpdateCRC32
1307 class LIR_OpUpdateCRC32: public LIR_Op {
1308   friend class LIR_OpVisitState;
1309 
1310 private:
1311   LIR_Opr   _crc;
1312   LIR_Opr   _val;
1313 
1314 public:
1315 
1316   LIR_OpUpdateCRC32(LIR_Opr crc, LIR_Opr val, LIR_Opr res);
1317 
1318   LIR_Opr crc() const                            { return _crc; }
1319   LIR_Opr val() const                            { return _val; }
1320 
1321   virtual void emit_code(LIR_Assembler* masm);
1322   virtual LIR_OpUpdateCRC32* as_OpUpdateCRC32()  { return this; }
1323   void print_instr(outputStream* out) const PRODUCT_RETURN;
1324 };
1325 
1326 // --------------------------------------------------
1327 // LIR_Op0
1328 // --------------------------------------------------
1329 class LIR_Op0: public LIR_Op {
1330  friend class LIR_OpVisitState;
1331 
1332  public:
1333   LIR_Op0(LIR_Code code)
1334    : LIR_Op(code, LIR_OprFact::illegalOpr, NULL)  { assert(is_in_range(code, begin_op0, end_op0), "code check"); }
1335   LIR_Op0(LIR_Code code, LIR_Opr result, CodeEmitInfo* info = NULL)
1336    : LIR_Op(code, result, info)  { assert(is_in_range(code, begin_op0, end_op0), "code check"); }
1337 
1338   virtual void emit_code(LIR_Assembler* masm);
1339   virtual LIR_Op0* as_Op0() { return this; }
1340   virtual void print_instr(outputStream* out) const PRODUCT_RETURN;
1341 };
1342 
1343 
1344 // --------------------------------------------------
1345 // LIR_Op1
1346 // --------------------------------------------------
1347 
1348 class LIR_Op1: public LIR_Op {
1349  friend class LIR_OpVisitState;
1350 
1351  protected:
1352   LIR_Opr         _opr;   // input operand
1353   BasicType       _type;  // Operand types
1354   LIR_PatchCode   _patch; // only required with patchin (NEEDS_CLEANUP: do we want a special instruction for patching?)
1355 
1356   static void print_patch_code(outputStream* out, LIR_PatchCode code);
1357 
1358   void set_kind(LIR_MoveKind kind) {
1359     assert(code() == lir_move, "must be");
1360     _flags = kind;
1361   }
1362 
1363  public:
1364   LIR_Op1(LIR_Code code, LIR_Opr opr, LIR_Opr result = LIR_OprFact::illegalOpr, BasicType type = T_ILLEGAL, LIR_PatchCode patch = lir_patch_none, CodeEmitInfo* info = NULL)
1365     : LIR_Op(code, result, info)
1366     , _opr(opr)
1367     , _type(type)
1368     , _patch(patch)                    { assert(is_in_range(code, begin_op1, end_op1), "code check"); }
1369 
1370   LIR_Op1(LIR_Code code, LIR_Opr opr, LIR_Opr result, BasicType type, LIR_PatchCode patch, CodeEmitInfo* info, LIR_MoveKind kind)
1371     : LIR_Op(code, result, info)
1372     , _opr(opr)
1373     , _type(type)
1374     , _patch(patch)                    {
1375     assert(code == lir_move, "must be");
1376     set_kind(kind);
1377   }
1378 
1379   LIR_Op1(LIR_Code code, LIR_Opr opr, CodeEmitInfo* info)
1380     : LIR_Op(code, LIR_OprFact::illegalOpr, info)
1381     , _opr(opr)
1382     , _type(T_ILLEGAL)
1383     , _patch(lir_patch_none)           { assert(is_in_range(code, begin_op1, end_op1), "code check"); }
1384 
1385   LIR_Opr in_opr()           const               { return _opr;   }
1386   LIR_PatchCode patch_code() const               { return _patch; }
1387   BasicType type()           const               { return _type;  }
1388 
1389   LIR_MoveKind move_kind() const {
1390     assert(code() == lir_move, "must be");
1391     return (LIR_MoveKind)_flags;
1392   }
1393 
1394   virtual bool is_patching() { return _patch != lir_patch_none; }
1395   virtual void emit_code(LIR_Assembler* masm);
1396   virtual LIR_Op1* as_Op1() { return this; }
1397   virtual const char * name() const PRODUCT_RETURN0;
1398 
1399   void set_in_opr(LIR_Opr opr) { _opr = opr; }
1400 
1401   virtual void print_instr(outputStream* out) const PRODUCT_RETURN;
1402   virtual void verify() const;
1403 };
1404 
1405 
1406 // for runtime calls
1407 class LIR_OpRTCall: public LIR_OpCall {
1408  friend class LIR_OpVisitState;
1409 
1410  private:
1411   LIR_Opr _tmp;
1412  public:
1413   LIR_OpRTCall(address addr, LIR_Opr tmp,
1414                LIR_Opr result, LIR_OprList* arguments, CodeEmitInfo* info = NULL)
1415     : LIR_OpCall(lir_rtcall, addr, result, arguments, info)
1416     , _tmp(tmp) {}
1417 
1418   virtual void print_instr(outputStream* out) const PRODUCT_RETURN;
1419   virtual void emit_code(LIR_Assembler* masm);
1420   virtual LIR_OpRTCall* as_OpRTCall() { return this; }
1421 
1422   LIR_Opr tmp() const                            { return _tmp; }
1423 
1424   virtual void verify() const;
1425 };
1426 
1427 
1428 class LIR_OpBranch: public LIR_Op {
1429  friend class LIR_OpVisitState;
1430 
1431  private:
1432   LIR_Condition _cond;
1433   Label*        _label;
1434   BlockBegin*   _block;  // if this is a branch to a block, this is the block
1435   BlockBegin*   _ublock; // if this is a float-branch, this is the unorderd block
1436   CodeStub*     _stub;   // if this is a branch to a stub, this is the stub
1437 
1438  public:
1439   LIR_OpBranch(LIR_Condition cond, Label* lbl)
1440     : LIR_Op(lir_branch, LIR_OprFact::illegalOpr, (CodeEmitInfo*) NULL)
1441     , _cond(cond)
1442     , _label(lbl)
1443     , _block(NULL)
1444     , _ublock(NULL)
1445     , _stub(NULL) { }
1446 
1447   LIR_OpBranch(LIR_Condition cond, BlockBegin* block);
1448   LIR_OpBranch(LIR_Condition cond, CodeStub* stub);
1449 
1450   // for unordered comparisons
1451   LIR_OpBranch(LIR_Condition cond, BlockBegin* block, BlockBegin* ublock);
1452 
1453   LIR_Condition cond()        const              { return _cond;        }
1454   Label*        label()       const              { return _label;       }
1455   BlockBegin*   block()       const              { return _block;       }
1456   BlockBegin*   ublock()      const              { return _ublock;      }
1457   CodeStub*     stub()        const              { return _stub;       }
1458 
1459   void          change_block(BlockBegin* b);
1460   void          change_ublock(BlockBegin* b);
1461   void          negate_cond();
1462 
1463   virtual void emit_code(LIR_Assembler* masm);
1464   virtual LIR_OpBranch* as_OpBranch() { return this; }
1465   virtual void print_instr(outputStream* out) const PRODUCT_RETURN;
1466 };
1467 
1468 class LIR_OpReturn: public LIR_Op1 {
1469  friend class LIR_OpVisitState;
1470 
1471  private:
1472   C1SafepointPollStub* _stub;
1473 
1474  public:
1475   LIR_OpReturn(LIR_Opr opr);
1476 
1477   C1SafepointPollStub* stub() const { return _stub; }
1478   virtual LIR_OpReturn* as_OpReturn() { return this; }
1479 };
1480 
1481 class ConversionStub;
1482 
1483 class LIR_OpConvert: public LIR_Op1 {
1484  friend class LIR_OpVisitState;
1485 
1486  private:
1487    Bytecodes::Code _bytecode;
1488    ConversionStub* _stub;
1489 
1490  public:
1491    LIR_OpConvert(Bytecodes::Code code, LIR_Opr opr, LIR_Opr result, ConversionStub* stub)
1492      : LIR_Op1(lir_convert, opr, result)
1493      , _bytecode(code)
1494      , _stub(stub)                               {}
1495 
1496   Bytecodes::Code bytecode() const               { return _bytecode; }
1497   ConversionStub* stub() const                   { return _stub; }
1498 
1499   virtual void emit_code(LIR_Assembler* masm);
1500   virtual LIR_OpConvert* as_OpConvert() { return this; }
1501   virtual void print_instr(outputStream* out) const PRODUCT_RETURN;
1502 
1503   static void print_bytecode(outputStream* out, Bytecodes::Code code) PRODUCT_RETURN;
1504 };
1505 
1506 
1507 // LIR_OpAllocObj
1508 class LIR_OpAllocObj : public LIR_Op1 {
1509  friend class LIR_OpVisitState;
1510 
1511  private:
1512   LIR_Opr _tmp1;
1513   LIR_Opr _tmp2;
1514   LIR_Opr _tmp3;
1515   LIR_Opr _tmp4;
1516   int     _hdr_size;
1517   int     _obj_size;
1518   CodeStub* _stub;
1519   bool    _init_check;
1520 
1521  public:
1522   LIR_OpAllocObj(LIR_Opr klass, LIR_Opr result,
1523                  LIR_Opr t1, LIR_Opr t2, LIR_Opr t3, LIR_Opr t4,
1524                  int hdr_size, int obj_size, bool init_check, CodeStub* stub)
1525     : LIR_Op1(lir_alloc_object, klass, result)
1526     , _tmp1(t1)
1527     , _tmp2(t2)
1528     , _tmp3(t3)
1529     , _tmp4(t4)
1530     , _hdr_size(hdr_size)
1531     , _obj_size(obj_size)
1532     , _stub(stub)
1533     , _init_check(init_check)                    { }
1534 
1535   LIR_Opr klass()        const                   { return in_opr();     }
1536   LIR_Opr obj()          const                   { return result_opr(); }
1537   LIR_Opr tmp1()         const                   { return _tmp1;        }
1538   LIR_Opr tmp2()         const                   { return _tmp2;        }
1539   LIR_Opr tmp3()         const                   { return _tmp3;        }
1540   LIR_Opr tmp4()         const                   { return _tmp4;        }
1541   int     header_size()  const                   { return _hdr_size;    }
1542   int     object_size()  const                   { return _obj_size;    }
1543   bool    init_check()   const                   { return _init_check;  }
1544   CodeStub* stub()       const                   { return _stub;        }
1545 
1546   virtual void emit_code(LIR_Assembler* masm);
1547   virtual LIR_OpAllocObj * as_OpAllocObj () { return this; }
1548   virtual void print_instr(outputStream* out) const PRODUCT_RETURN;
1549 };
1550 
1551 
1552 // LIR_OpRoundFP
1553 class LIR_OpRoundFP : public LIR_Op1 {
1554  friend class LIR_OpVisitState;
1555 
1556  private:
1557   LIR_Opr _tmp;
1558 
1559  public:
1560   LIR_OpRoundFP(LIR_Opr reg, LIR_Opr stack_loc_temp, LIR_Opr result)
1561     : LIR_Op1(lir_roundfp, reg, result)
1562     , _tmp(stack_loc_temp) {}
1563 
1564   LIR_Opr tmp() const                            { return _tmp; }
1565   virtual LIR_OpRoundFP* as_OpRoundFP()          { return this; }
1566   void print_instr(outputStream* out) const PRODUCT_RETURN;
1567 };
1568 
1569 // LIR_OpTypeCheck
1570 class LIR_OpTypeCheck: public LIR_Op {
1571  friend class LIR_OpVisitState;
1572 
1573  private:
1574   LIR_Opr       _object;
1575   LIR_Opr       _array;
1576   ciKlass*      _klass;
1577   LIR_Opr       _tmp1;
1578   LIR_Opr       _tmp2;
1579   LIR_Opr       _tmp3;
1580   bool          _fast_check;
1581   CodeEmitInfo* _info_for_patch;
1582   CodeEmitInfo* _info_for_exception;
1583   CodeStub*     _stub;
1584   ciMethod*     _profiled_method;
1585   int           _profiled_bci;
1586   bool          _should_profile;
1587   bool          _need_null_check;
1588 
1589 public:
1590   LIR_OpTypeCheck(LIR_Code code, LIR_Opr result, LIR_Opr object, ciKlass* klass,
1591                   LIR_Opr tmp1, LIR_Opr tmp2, LIR_Opr tmp3, bool fast_check,
1592                   CodeEmitInfo* info_for_exception, CodeEmitInfo* info_for_patch, CodeStub* stub, bool need_null_check = true);
1593   LIR_OpTypeCheck(LIR_Code code, LIR_Opr object, LIR_Opr array,
1594                   LIR_Opr tmp1, LIR_Opr tmp2, LIR_Opr tmp3, CodeEmitInfo* info_for_exception);
1595 
1596   LIR_Opr object() const                         { return _object;         }
1597   LIR_Opr array() const                          { assert(code() == lir_store_check, "not valid"); return _array;         }
1598   LIR_Opr tmp1() const                           { return _tmp1;           }
1599   LIR_Opr tmp2() const                           { return _tmp2;           }
1600   LIR_Opr tmp3() const                           { return _tmp3;           }
1601   ciKlass* klass() const                         { assert(code() == lir_instanceof || code() == lir_checkcast, "not valid"); return _klass;          }
1602   bool fast_check() const                        { assert(code() == lir_instanceof || code() == lir_checkcast, "not valid"); return _fast_check;     }
1603   CodeEmitInfo* info_for_patch() const           { return _info_for_patch;  }
1604   CodeEmitInfo* info_for_exception() const       { return _info_for_exception; }
1605   CodeStub* stub() const                         { return _stub;           }
1606 
1607   // MethodData* profiling
1608   void set_profiled_method(ciMethod *method)     { _profiled_method = method; }
1609   void set_profiled_bci(int bci)                 { _profiled_bci = bci;       }
1610   void set_should_profile(bool b)                { _should_profile = b;       }
1611   ciMethod* profiled_method() const              { return _profiled_method;   }
1612   int       profiled_bci() const                 { return _profiled_bci;      }
1613   bool      should_profile() const               { return _should_profile;    }
1614   bool      need_null_check() const              { return _need_null_check;   }
1615   virtual bool is_patching() { return _info_for_patch != NULL; }
1616   virtual void emit_code(LIR_Assembler* masm);
1617   virtual LIR_OpTypeCheck* as_OpTypeCheck() { return this; }
1618   void print_instr(outputStream* out) const PRODUCT_RETURN;
1619 };
1620 
1621 // LIR_OpFlattenedArrayCheck
1622 class LIR_OpFlattenedArrayCheck: public LIR_Op {
1623  friend class LIR_OpVisitState;
1624 
1625  private:
1626   LIR_Opr       _array;
1627   LIR_Opr       _value;
1628   LIR_Opr       _tmp;
1629   CodeStub*     _stub;
1630 public:
1631   LIR_OpFlattenedArrayCheck(LIR_Opr array, LIR_Opr value, LIR_Opr tmp, CodeStub* stub);
1632   LIR_Opr array() const                          { return _array;         }
1633   LIR_Opr value() const                          { return _value;         }
1634   LIR_Opr tmp() const                            { return _tmp;           }
1635   CodeStub* stub() const                         { return _stub;          }
1636 
1637   virtual void emit_code(LIR_Assembler* masm);
1638   virtual LIR_OpFlattenedArrayCheck* as_OpFlattenedArrayCheck() { return this; }
1639   virtual void print_instr(outputStream* out) const PRODUCT_RETURN;
1640 };
1641 
1642 // LIR_OpNullFreeArrayCheck
1643 class LIR_OpNullFreeArrayCheck: public LIR_Op {
1644  friend class LIR_OpVisitState;
1645 
1646  private:
1647   LIR_Opr       _array;
1648   LIR_Opr       _tmp;
1649 public:
1650   LIR_OpNullFreeArrayCheck(LIR_Opr array, LIR_Opr tmp);
1651   LIR_Opr array() const                          { return _array;         }
1652   LIR_Opr tmp() const                            { return _tmp;           }
1653 
1654   virtual void emit_code(LIR_Assembler* masm);
1655   virtual LIR_OpNullFreeArrayCheck* as_OpNullFreeArrayCheck() { return this; }
1656   virtual void print_instr(outputStream* out) const PRODUCT_RETURN;
1657 };
1658 
1659 class LIR_OpSubstitutabilityCheck: public LIR_Op {
1660  friend class LIR_OpVisitState;
1661 
1662  private:
1663   LIR_Opr       _left;
1664   LIR_Opr       _right;
1665   LIR_Opr       _equal_result;
1666   LIR_Opr       _not_equal_result;
1667   LIR_Opr       _tmp1;
1668   LIR_Opr       _tmp2;
1669   ciKlass*      _left_klass;
1670   ciKlass*      _right_klass;
1671   LIR_Opr       _left_klass_op;
1672   LIR_Opr       _right_klass_op;
1673   CodeStub*     _stub;
1674 public:
1675   LIR_OpSubstitutabilityCheck(LIR_Opr result, LIR_Opr left, LIR_Opr right, LIR_Opr equal_result, LIR_Opr not_equal_result,
1676                               LIR_Opr tmp1, LIR_Opr tmp2,
1677                               ciKlass* left_klass, ciKlass* right_klass, LIR_Opr left_klass_op, LIR_Opr right_klass_op,
1678                               CodeEmitInfo* info, CodeStub* stub);
1679 
1680   LIR_Opr left() const             { return _left; }
1681   LIR_Opr right() const            { return _right; }
1682   LIR_Opr equal_result() const     { return _equal_result; }
1683   LIR_Opr not_equal_result() const { return _not_equal_result; }
1684   LIR_Opr tmp1() const             { return _tmp1; }
1685   LIR_Opr tmp2() const             { return _tmp2; }
1686   ciKlass* left_klass() const      { return _left_klass; }
1687   ciKlass* right_klass() const     { return _right_klass; }
1688   LIR_Opr left_klass_op() const    { return _left_klass_op; }
1689   LIR_Opr right_klass_op() const   { return _right_klass_op; }
1690   CodeStub* stub() const           { return _stub; }
1691 
1692   virtual void emit_code(LIR_Assembler* masm);
1693   virtual LIR_OpSubstitutabilityCheck* as_OpSubstitutabilityCheck() { return this; }
1694   virtual void print_instr(outputStream* out) const PRODUCT_RETURN;
1695 };
1696 
1697 // LIR_Op2
1698 class LIR_Op2: public LIR_Op {
1699  friend class LIR_OpVisitState;
1700 
1701   int  _fpu_stack_size; // for sin/cos implementation on Intel
1702 
1703  protected:
1704   LIR_Opr   _opr1;
1705   LIR_Opr   _opr2;
1706   BasicType _type;
1707   LIR_Opr   _tmp1;
1708   LIR_Opr   _tmp2;
1709   LIR_Opr   _tmp3;
1710   LIR_Opr   _tmp4;
1711   LIR_Opr   _tmp5;
1712   LIR_Condition _condition;
1713 
1714   void verify() const;
1715 
1716  public:
1717   LIR_Op2(LIR_Code code, LIR_Condition condition, LIR_Opr opr1, LIR_Opr opr2, CodeEmitInfo* info = NULL)
1718     : LIR_Op(code, LIR_OprFact::illegalOpr, info)
1719     , _fpu_stack_size(0)
1720     , _opr1(opr1)
1721     , _opr2(opr2)
1722     , _type(T_ILLEGAL)
1723     , _tmp1(LIR_OprFact::illegalOpr)
1724     , _tmp2(LIR_OprFact::illegalOpr)
1725     , _tmp3(LIR_OprFact::illegalOpr)
1726     , _tmp4(LIR_OprFact::illegalOpr)
1727     , _tmp5(LIR_OprFact::illegalOpr)
1728     , _condition(condition) {
1729     assert(code == lir_cmp || code == lir_assert, "code check");
1730   }
1731 
1732   LIR_Op2(LIR_Code code, LIR_Condition condition, LIR_Opr opr1, LIR_Opr opr2, LIR_Opr result, BasicType type)
1733     : LIR_Op(code, result, NULL)
1734     , _fpu_stack_size(0)
1735     , _opr1(opr1)
1736     , _opr2(opr2)
1737     , _type(type)
1738     , _tmp1(LIR_OprFact::illegalOpr)
1739     , _tmp2(LIR_OprFact::illegalOpr)
1740     , _tmp3(LIR_OprFact::illegalOpr)
1741     , _tmp4(LIR_OprFact::illegalOpr)
1742     , _tmp5(LIR_OprFact::illegalOpr)
1743     , _condition(condition) {
1744     assert(code == lir_cmove, "code check");
1745     assert(type != T_ILLEGAL, "cmove should have type");
1746   }
1747 
1748   LIR_Op2(LIR_Code code, LIR_Opr opr1, LIR_Opr opr2, LIR_Opr result = LIR_OprFact::illegalOpr,
1749           CodeEmitInfo* info = NULL, BasicType type = T_ILLEGAL)
1750     : LIR_Op(code, result, info)
1751     , _fpu_stack_size(0)
1752     , _opr1(opr1)
1753     , _opr2(opr2)
1754     , _type(type)
1755     , _tmp1(LIR_OprFact::illegalOpr)
1756     , _tmp2(LIR_OprFact::illegalOpr)
1757     , _tmp3(LIR_OprFact::illegalOpr)
1758     , _tmp4(LIR_OprFact::illegalOpr)
1759     , _tmp5(LIR_OprFact::illegalOpr)
1760     , _condition(lir_cond_unknown) {
1761     assert(code != lir_cmp && is_in_range(code, begin_op2, end_op2), "code check");
1762   }
1763 
1764   LIR_Op2(LIR_Code code, LIR_Opr opr1, LIR_Opr opr2, LIR_Opr result, LIR_Opr tmp1, LIR_Opr tmp2 = LIR_OprFact::illegalOpr,
1765           LIR_Opr tmp3 = LIR_OprFact::illegalOpr, LIR_Opr tmp4 = LIR_OprFact::illegalOpr, LIR_Opr tmp5 = LIR_OprFact::illegalOpr)
1766     : LIR_Op(code, result, NULL)
1767     , _fpu_stack_size(0)
1768     , _opr1(opr1)
1769     , _opr2(opr2)
1770     , _type(T_ILLEGAL)
1771     , _tmp1(tmp1)
1772     , _tmp2(tmp2)
1773     , _tmp3(tmp3)
1774     , _tmp4(tmp4)
1775     , _tmp5(tmp5)
1776     , _condition(lir_cond_unknown) {
1777     assert(code != lir_cmp && is_in_range(code, begin_op2, end_op2), "code check");
1778   }
1779 
1780   LIR_Opr in_opr1() const                        { return _opr1; }
1781   LIR_Opr in_opr2() const                        { return _opr2; }
1782   BasicType type()  const                        { return _type; }
1783   LIR_Opr tmp1_opr() const                       { return _tmp1; }
1784   LIR_Opr tmp2_opr() const                       { return _tmp2; }
1785   LIR_Opr tmp3_opr() const                       { return _tmp3; }
1786   LIR_Opr tmp4_opr() const                       { return _tmp4; }
1787   LIR_Opr tmp5_opr() const                       { return _tmp5; }
1788   LIR_Condition condition() const  {
1789     assert(code() == lir_cmp || code() == lir_cmove || code() == lir_assert, "only valid for cmp and cmove and assert"); return _condition;
1790   }
1791   void set_condition(LIR_Condition condition) {
1792     assert(code() == lir_cmp || code() == lir_cmove, "only valid for cmp and cmove");  _condition = condition;
1793   }
1794 
1795   void set_fpu_stack_size(int size)              { _fpu_stack_size = size; }
1796   int  fpu_stack_size() const                    { return _fpu_stack_size; }
1797 
1798   void set_in_opr1(LIR_Opr opr)                  { _opr1 = opr; }
1799   void set_in_opr2(LIR_Opr opr)                  { _opr2 = opr; }
1800 
1801   virtual void emit_code(LIR_Assembler* masm);
1802   virtual LIR_Op2* as_Op2() { return this; }
1803   virtual void print_instr(outputStream* out) const PRODUCT_RETURN;
1804 };
1805 
1806 class LIR_OpAllocArray : public LIR_Op {
1807  friend class LIR_OpVisitState;
1808 
1809  private:
1810   LIR_Opr   _klass;
1811   LIR_Opr   _len;
1812   LIR_Opr   _tmp1;
1813   LIR_Opr   _tmp2;
1814   LIR_Opr   _tmp3;
1815   LIR_Opr   _tmp4;
1816   BasicType _type;
1817   CodeStub* _stub;
1818 
1819  public:
1820   LIR_OpAllocArray(LIR_Opr klass, LIR_Opr len, LIR_Opr result, LIR_Opr t1, LIR_Opr t2, LIR_Opr t3, LIR_Opr t4, BasicType type, CodeStub* stub)
1821     : LIR_Op(lir_alloc_array, result, NULL)
1822     , _klass(klass)
1823     , _len(len)
1824     , _tmp1(t1)
1825     , _tmp2(t2)
1826     , _tmp3(t3)
1827     , _tmp4(t4)
1828     , _type(type)
1829     , _stub(stub) {}
1830 
1831   LIR_Opr   klass()   const                      { return _klass;       }
1832   LIR_Opr   len()     const                      { return _len;         }
1833   LIR_Opr   obj()     const                      { return result_opr(); }
1834   LIR_Opr   tmp1()    const                      { return _tmp1;        }
1835   LIR_Opr   tmp2()    const                      { return _tmp2;        }
1836   LIR_Opr   tmp3()    const                      { return _tmp3;        }
1837   LIR_Opr   tmp4()    const                      { return _tmp4;        }
1838   BasicType type()    const                      { return _type;        }
1839   CodeStub* stub()    const                      { return _stub;        }
1840 
1841   virtual void emit_code(LIR_Assembler* masm);
1842   virtual LIR_OpAllocArray * as_OpAllocArray () { return this; }
1843   virtual void print_instr(outputStream* out) const PRODUCT_RETURN;
1844 };
1845 
1846 
1847 class LIR_Op3: public LIR_Op {
1848  friend class LIR_OpVisitState;
1849 
1850  private:
1851   LIR_Opr _opr1;
1852   LIR_Opr _opr2;
1853   LIR_Opr _opr3;
1854  public:
1855   LIR_Op3(LIR_Code code, LIR_Opr opr1, LIR_Opr opr2, LIR_Opr opr3, LIR_Opr result, CodeEmitInfo* info = NULL)
1856     : LIR_Op(code, result, info)
1857     , _opr1(opr1)
1858     , _opr2(opr2)
1859     , _opr3(opr3)                                { assert(is_in_range(code, begin_op3, end_op3), "code check"); }
1860   LIR_Opr in_opr1() const                        { return _opr1; }
1861   LIR_Opr in_opr2() const                        { return _opr2; }
1862   LIR_Opr in_opr3() const                        { return _opr3; }
1863 
1864   virtual void emit_code(LIR_Assembler* masm);
1865   virtual LIR_Op3* as_Op3() { return this; }
1866   virtual void print_instr(outputStream* out) const PRODUCT_RETURN;
1867 };
1868 
1869 
1870 //--------------------------------
1871 class LabelObj: public CompilationResourceObj {
1872  private:
1873   Label _label;
1874  public:
1875   LabelObj()                                     {}
1876   Label* label()                                 { return &_label; }
1877 };
1878 
1879 
1880 class LIR_OpLock: public LIR_Op {
1881  friend class LIR_OpVisitState;
1882 
1883  private:
1884   LIR_Opr _hdr;
1885   LIR_Opr _obj;
1886   LIR_Opr _lock;
1887   LIR_Opr _scratch;
1888   CodeStub* _stub;
1889   CodeStub* _throw_imse_stub;
1890  public:
1891   LIR_OpLock(LIR_Code code, LIR_Opr hdr, LIR_Opr obj, LIR_Opr lock, LIR_Opr scratch, CodeStub* stub, CodeEmitInfo* info, CodeStub* throw_imse_stub=NULL)
1892     : LIR_Op(code, LIR_OprFact::illegalOpr, info)
1893     , _hdr(hdr)
1894     , _obj(obj)
1895     , _lock(lock)
1896     , _scratch(scratch)
1897     , _stub(stub)
1898     , _throw_imse_stub(throw_imse_stub)                    {}
1899 
1900   LIR_Opr hdr_opr() const                        { return _hdr; }
1901   LIR_Opr obj_opr() const                        { return _obj; }
1902   LIR_Opr lock_opr() const                       { return _lock; }
1903   LIR_Opr scratch_opr() const                    { return _scratch; }
1904   CodeStub* stub() const                         { return _stub; }
1905   CodeStub* throw_imse_stub() const              { return _throw_imse_stub; }
1906 
1907   virtual void emit_code(LIR_Assembler* masm);
1908   virtual LIR_OpLock* as_OpLock() { return this; }
1909   void print_instr(outputStream* out) const PRODUCT_RETURN;
1910 };
1911 
1912 
1913 class LIR_OpDelay: public LIR_Op {
1914  friend class LIR_OpVisitState;
1915 
1916  private:
1917   LIR_Op* _op;
1918 
1919  public:
1920   LIR_OpDelay(LIR_Op* op, CodeEmitInfo* info):
1921     LIR_Op(lir_delay_slot, LIR_OprFact::illegalOpr, info),
1922     _op(op) {
1923     assert(op->code() == lir_nop, "should be filling with nops");
1924   }
1925   virtual void emit_code(LIR_Assembler* masm);
1926   virtual LIR_OpDelay* as_OpDelay() { return this; }
1927   void print_instr(outputStream* out) const PRODUCT_RETURN;
1928   LIR_Op* delay_op() const { return _op; }
1929   CodeEmitInfo* call_info() const { return info(); }
1930 };
1931 
1932 #ifdef ASSERT
1933 // LIR_OpAssert
1934 class LIR_OpAssert : public LIR_Op2 {
1935  friend class LIR_OpVisitState;
1936 
1937  private:
1938   const char* _msg;
1939   bool        _halt;
1940 
1941  public:
1942   LIR_OpAssert(LIR_Condition condition, LIR_Opr opr1, LIR_Opr opr2, const char* msg, bool halt)
1943     : LIR_Op2(lir_assert, condition, opr1, opr2)
1944     , _msg(msg)
1945     , _halt(halt) {
1946   }
1947 
1948   const char* msg() const                        { return _msg; }
1949   bool        halt() const                       { return _halt; }
1950 
1951   virtual void emit_code(LIR_Assembler* masm);
1952   virtual LIR_OpAssert* as_OpAssert()            { return this; }
1953   virtual void print_instr(outputStream* out) const PRODUCT_RETURN;
1954 };
1955 #endif
1956 
1957 // LIR_OpCompareAndSwap
1958 class LIR_OpCompareAndSwap : public LIR_Op {
1959  friend class LIR_OpVisitState;
1960 
1961  private:
1962   LIR_Opr _addr;
1963   LIR_Opr _cmp_value;
1964   LIR_Opr _new_value;
1965   LIR_Opr _tmp1;
1966   LIR_Opr _tmp2;
1967 
1968  public:
1969   LIR_OpCompareAndSwap(LIR_Code code, LIR_Opr addr, LIR_Opr cmp_value, LIR_Opr new_value,
1970                        LIR_Opr t1, LIR_Opr t2, LIR_Opr result)
1971     : LIR_Op(code, result, NULL)  // no result, no info
1972     , _addr(addr)
1973     , _cmp_value(cmp_value)
1974     , _new_value(new_value)
1975     , _tmp1(t1)
1976     , _tmp2(t2)                                  { }
1977 
1978   LIR_Opr addr()        const                    { return _addr;  }
1979   LIR_Opr cmp_value()   const                    { return _cmp_value; }
1980   LIR_Opr new_value()   const                    { return _new_value; }
1981   LIR_Opr tmp1()        const                    { return _tmp1;      }
1982   LIR_Opr tmp2()        const                    { return _tmp2;      }
1983 
1984   virtual void emit_code(LIR_Assembler* masm);
1985   virtual LIR_OpCompareAndSwap * as_OpCompareAndSwap () { return this; }
1986   virtual void print_instr(outputStream* out) const PRODUCT_RETURN;
1987 };
1988 
1989 // LIR_OpProfileCall
1990 class LIR_OpProfileCall : public LIR_Op {
1991  friend class LIR_OpVisitState;
1992 
1993  private:
1994   ciMethod* _profiled_method;
1995   int       _profiled_bci;
1996   ciMethod* _profiled_callee;
1997   LIR_Opr   _mdo;
1998   LIR_Opr   _recv;
1999   LIR_Opr   _tmp1;
2000   ciKlass*  _known_holder;
2001 
2002  public:
2003   // Destroys recv
2004   LIR_OpProfileCall(ciMethod* profiled_method, int profiled_bci, ciMethod* profiled_callee, LIR_Opr mdo, LIR_Opr recv, LIR_Opr t1, ciKlass* known_holder)
2005     : LIR_Op(lir_profile_call, LIR_OprFact::illegalOpr, NULL)  // no result, no info
2006     , _profiled_method(profiled_method)
2007     , _profiled_bci(profiled_bci)
2008     , _profiled_callee(profiled_callee)
2009     , _mdo(mdo)
2010     , _recv(recv)
2011     , _tmp1(t1)
2012     , _known_holder(known_holder)                { }
2013 
2014   ciMethod* profiled_method() const              { return _profiled_method;  }
2015   int       profiled_bci()    const              { return _profiled_bci;     }
2016   ciMethod* profiled_callee() const              { return _profiled_callee;  }
2017   LIR_Opr   mdo()             const              { return _mdo;              }
2018   LIR_Opr   recv()            const              { return _recv;             }
2019   LIR_Opr   tmp1()            const              { return _tmp1;             }
2020   ciKlass*  known_holder()    const              { return _known_holder;     }
2021 
2022   virtual void emit_code(LIR_Assembler* masm);
2023   virtual LIR_OpProfileCall* as_OpProfileCall() { return this; }
2024   virtual void print_instr(outputStream* out) const PRODUCT_RETURN;
2025   bool should_profile_receiver_type() const {
2026     bool callee_is_static = _profiled_callee->is_loaded() && _profiled_callee->is_static();
2027     Bytecodes::Code bc = _profiled_method->java_code_at_bci(_profiled_bci);
2028     bool call_is_virtual = (bc == Bytecodes::_invokevirtual && !_profiled_callee->can_be_statically_bound()) || bc == Bytecodes::_invokeinterface;
2029     return C1ProfileVirtualCalls && call_is_virtual && !callee_is_static;
2030   }
2031 };
2032 
2033 // LIR_OpProfileType
2034 class LIR_OpProfileType : public LIR_Op {
2035  friend class LIR_OpVisitState;
2036 
2037  private:
2038   LIR_Opr      _mdp;
2039   LIR_Opr      _obj;
2040   LIR_Opr      _tmp;
2041   ciKlass*     _exact_klass;   // non NULL if we know the klass statically (no need to load it from _obj)
2042   intptr_t     _current_klass; // what the profiling currently reports
2043   bool         _not_null;      // true if we know statically that _obj cannot be null
2044   bool         _no_conflict;   // true if we're profling parameters, _exact_klass is not NULL and we know
2045                                // _exact_klass it the only possible type for this parameter in any context.
2046 
2047  public:
2048   // Destroys recv
2049   LIR_OpProfileType(LIR_Opr mdp, LIR_Opr obj, ciKlass* exact_klass, intptr_t current_klass, LIR_Opr tmp, bool not_null, bool no_conflict)
2050     : LIR_Op(lir_profile_type, LIR_OprFact::illegalOpr, NULL)  // no result, no info
2051     , _mdp(mdp)
2052     , _obj(obj)
2053     , _tmp(tmp)
2054     , _exact_klass(exact_klass)
2055     , _current_klass(current_klass)
2056     , _not_null(not_null)
2057     , _no_conflict(no_conflict) { }
2058 
2059   LIR_Opr      mdp()              const             { return _mdp;              }
2060   LIR_Opr      obj()              const             { return _obj;              }
2061   LIR_Opr      tmp()              const             { return _tmp;              }
2062   ciKlass*     exact_klass()      const             { return _exact_klass;      }
2063   intptr_t     current_klass()    const             { return _current_klass;    }
2064   bool         not_null()         const             { return _not_null;         }
2065   bool         no_conflict()      const             { return _no_conflict;      }
2066 
2067   virtual void emit_code(LIR_Assembler* masm);
2068   virtual LIR_OpProfileType* as_OpProfileType() { return this; }
2069   virtual void print_instr(outputStream* out) const PRODUCT_RETURN;
2070 };
2071 
2072 // LIR_OpProfileInlineType
2073 class LIR_OpProfileInlineType : public LIR_Op {
2074  friend class LIR_OpVisitState;
2075 
2076  private:
2077   LIR_Opr      _mdp;
2078   LIR_Opr      _obj;
2079   int          _flag;
2080   LIR_Opr      _tmp;
2081   bool         _not_null;      // true if we know statically that _obj cannot be null
2082 
2083  public:
2084   // Destroys recv
2085   LIR_OpProfileInlineType(LIR_Opr mdp, LIR_Opr obj, int flag, LIR_Opr tmp, bool not_null)
2086     : LIR_Op(lir_profile_inline_type, LIR_OprFact::illegalOpr, NULL)  // no result, no info
2087     , _mdp(mdp)
2088     , _obj(obj)
2089     , _flag(flag)
2090     , _tmp(tmp)
2091     , _not_null(not_null) { }
2092 
2093   LIR_Opr      mdp()              const             { return _mdp;              }
2094   LIR_Opr      obj()              const             { return _obj;              }
2095   int          flag()             const             { return _flag;             }
2096   LIR_Opr      tmp()              const             { return _tmp;              }
2097   bool         not_null()         const             { return _not_null;         }
2098 
2099   virtual void emit_code(LIR_Assembler* masm);
2100   virtual LIR_OpProfileInlineType* as_OpProfileInlineType() { return this; }
2101   virtual void print_instr(outputStream* out) const PRODUCT_RETURN;
2102 };
2103 
2104 class LIR_InsertionBuffer;
2105 
2106 //--------------------------------LIR_List---------------------------------------------------
2107 // Maintains a list of LIR instructions (one instance of LIR_List per basic block)
2108 // The LIR instructions are appended by the LIR_List class itself;
2109 //
2110 // Notes:
2111 // - all offsets are(should be) in bytes
2112 // - local positions are specified with an offset, with offset 0 being local 0
2113 
2114 class LIR_List: public CompilationResourceObj {
2115  private:
2116   LIR_OpList  _operations;
2117 
2118   Compilation*  _compilation;
2119 #ifndef PRODUCT
2120   BlockBegin*   _block;
2121 #endif
2122 #ifdef ASSERT
2123   const char *  _file;
2124   int           _line;
2125 #endif
2126 
2127  public:
2128   void append(LIR_Op* op) {
2129     if (op->source() == NULL)
2130       op->set_source(_compilation->current_instruction());
2131 #ifndef PRODUCT
2132     if (PrintIRWithLIR) {
2133       _compilation->maybe_print_current_instruction();
2134       op->print(); tty->cr();
2135     }
2136 #endif // PRODUCT
2137 
2138     _operations.append(op);
2139 
2140 #ifdef ASSERT
2141     op->verify();
2142     op->set_file_and_line(_file, _line);
2143     _file = NULL;
2144     _line = 0;
2145 #endif
2146   }
2147 
2148   LIR_List(Compilation* compilation, BlockBegin* block = NULL);
2149 
2150 #ifdef ASSERT
2151   void set_file_and_line(const char * file, int line);
2152 #endif
2153 
2154   //---------- accessors ---------------
2155   LIR_OpList* instructions_list()                { return &_operations; }
2156   int         length() const                     { return _operations.length(); }
2157   LIR_Op*     at(int i) const                    { return _operations.at(i); }
2158 
2159   NOT_PRODUCT(BlockBegin* block() const          { return _block; });
2160 
2161   // insert LIR_Ops in buffer to right places in LIR_List
2162   void append(LIR_InsertionBuffer* buffer);
2163 
2164   //---------- mutators ---------------
2165   void insert_before(int i, LIR_List* op_list)   { _operations.insert_before(i, op_list->instructions_list()); }
2166   void insert_before(int i, LIR_Op* op)          { _operations.insert_before(i, op); }
2167   void remove_at(int i)                          { _operations.remove_at(i); }
2168 
2169   //---------- printing -------------
2170   void print_instructions() PRODUCT_RETURN;
2171 
2172 
2173   //---------- instructions -------------
2174   void call_opt_virtual(ciMethod* method, LIR_Opr receiver, LIR_Opr result,
2175                         address dest, LIR_OprList* arguments,
2176                         CodeEmitInfo* info) {
2177     append(new LIR_OpJavaCall(lir_optvirtual_call, method, receiver, result, dest, arguments, info));
2178   }
2179   void call_static(ciMethod* method, LIR_Opr result,
2180                    address dest, LIR_OprList* arguments, CodeEmitInfo* info) {
2181     append(new LIR_OpJavaCall(lir_static_call, method, LIR_OprFact::illegalOpr, result, dest, arguments, info));
2182   }
2183   void call_icvirtual(ciMethod* method, LIR_Opr receiver, LIR_Opr result,
2184                       address dest, LIR_OprList* arguments, CodeEmitInfo* info) {
2185     append(new LIR_OpJavaCall(lir_icvirtual_call, method, receiver, result, dest, arguments, info));
2186   }
2187   void call_dynamic(ciMethod* method, LIR_Opr receiver, LIR_Opr result,
2188                     address dest, LIR_OprList* arguments, CodeEmitInfo* info) {
2189     append(new LIR_OpJavaCall(lir_dynamic_call, method, receiver, result, dest, arguments, info));
2190   }
2191 
2192   void get_thread(LIR_Opr result)                { append(new LIR_Op0(lir_get_thread, result)); }
2193   void membar()                                  { append(new LIR_Op0(lir_membar)); }
2194   void membar_acquire()                          { append(new LIR_Op0(lir_membar_acquire)); }
2195   void membar_release()                          { append(new LIR_Op0(lir_membar_release)); }
2196   void membar_loadload()                         { append(new LIR_Op0(lir_membar_loadload)); }
2197   void membar_storestore()                       { append(new LIR_Op0(lir_membar_storestore)); }
2198   void membar_loadstore()                        { append(new LIR_Op0(lir_membar_loadstore)); }
2199   void membar_storeload()                        { append(new LIR_Op0(lir_membar_storeload)); }
2200 
2201   void nop()                                     { append(new LIR_Op0(lir_nop)); }
2202 
2203   void std_entry(LIR_Opr receiver)               { append(new LIR_Op0(lir_std_entry, receiver)); }
2204   void osr_entry(LIR_Opr osrPointer)             { append(new LIR_Op0(lir_osr_entry, osrPointer)); }
2205 
2206   void on_spin_wait()                            { append(new LIR_Op0(lir_on_spin_wait)); }
2207 
2208   void branch_destination(Label* lbl)            { append(new LIR_OpLabel(lbl)); }
2209 
2210   void leal(LIR_Opr from, LIR_Opr result_reg, LIR_PatchCode patch_code = lir_patch_none, CodeEmitInfo* info = NULL) { append(new LIR_Op1(lir_leal, from, result_reg, T_ILLEGAL, patch_code, info)); }
2211 
2212   // result is a stack location for old backend and vreg for UseLinearScan
2213   // stack_loc_temp is an illegal register for old backend
2214   void roundfp(LIR_Opr reg, LIR_Opr stack_loc_temp, LIR_Opr result) { append(new LIR_OpRoundFP(reg, stack_loc_temp, result)); }
2215   void move(LIR_Opr src, LIR_Opr dst, CodeEmitInfo* info = NULL) { append(new LIR_Op1(lir_move, src, dst, dst->type(), lir_patch_none, info)); }
2216   void move(LIR_Address* src, LIR_Opr dst, CodeEmitInfo* info = NULL) { append(new LIR_Op1(lir_move, LIR_OprFact::address(src), dst, src->type(), lir_patch_none, info)); }
2217   void move(LIR_Opr src, LIR_Address* dst, CodeEmitInfo* info = NULL) { append(new LIR_Op1(lir_move, src, LIR_OprFact::address(dst), dst->type(), lir_patch_none, info)); }
2218   void move_wide(LIR_Address* src, LIR_Opr dst, CodeEmitInfo* info = NULL) {
2219     if (UseCompressedOops) {
2220       append(new LIR_Op1(lir_move, LIR_OprFact::address(src), dst, src->type(), lir_patch_none, info, lir_move_wide));
2221     } else {
2222       move(src, dst, info);
2223     }
2224   }
2225   void move_wide(LIR_Opr src, LIR_Address* dst, CodeEmitInfo* info = NULL) {
2226     if (UseCompressedOops) {
2227       append(new LIR_Op1(lir_move, src, LIR_OprFact::address(dst), dst->type(), lir_patch_none, info, lir_move_wide));
2228     } else {
2229       move(src, dst, info);
2230     }
2231   }
2232   void volatile_move(LIR_Opr src, LIR_Opr dst, BasicType type, CodeEmitInfo* info = NULL, LIR_PatchCode patch_code = lir_patch_none) { append(new LIR_Op1(lir_move, src, dst, type, patch_code, info, lir_move_volatile)); }
2233 
2234   void oop2reg  (jobject o, LIR_Opr reg)         { assert(reg->type() == T_OBJECT, "bad reg"); append(new LIR_Op1(lir_move, LIR_OprFact::oopConst(o),    reg));   }
2235   void oop2reg_patch(jobject o, LIR_Opr reg, CodeEmitInfo* info);
2236 
2237   void metadata2reg  (Metadata* o, LIR_Opr reg)  { assert(reg->type() == T_METADATA, "bad reg"); append(new LIR_Op1(lir_move, LIR_OprFact::metadataConst(o), reg));   }
2238   void klass2reg_patch(Metadata* o, LIR_Opr reg, CodeEmitInfo* info);
2239 
2240   void safepoint(LIR_Opr tmp, CodeEmitInfo* info)  { append(new LIR_Op1(lir_safepoint, tmp, info)); }
2241   void return_op(LIR_Opr result)                   { append(new LIR_OpReturn(result)); }
2242 
2243   void convert(Bytecodes::Code code, LIR_Opr left, LIR_Opr dst, ConversionStub* stub = NULL/*, bool is_32bit = false*/) { append(new LIR_OpConvert(code, left, dst, stub)); }
2244 
2245   void logical_and (LIR_Opr left, LIR_Opr right, LIR_Opr dst) { append(new LIR_Op2(lir_logic_and,  left, right, dst)); }
2246   void logical_or  (LIR_Opr left, LIR_Opr right, LIR_Opr dst) { append(new LIR_Op2(lir_logic_or,   left, right, dst)); }
2247   void logical_xor (LIR_Opr left, LIR_Opr right, LIR_Opr dst) { append(new LIR_Op2(lir_logic_xor,  left, right, dst)); }
2248 
2249   void null_check(LIR_Opr opr, CodeEmitInfo* info, bool deoptimize_on_null = false);
2250   void throw_exception(LIR_Opr exceptionPC, LIR_Opr exceptionOop, CodeEmitInfo* info) {
2251     append(new LIR_Op2(lir_throw, exceptionPC, exceptionOop, LIR_OprFact::illegalOpr, info));
2252   }
2253   void unwind_exception(LIR_Opr exceptionOop) {
2254     append(new LIR_Op1(lir_unwind, exceptionOop));
2255   }
2256 
2257   void push(LIR_Opr opr)                                   { append(new LIR_Op1(lir_push, opr)); }
2258   void pop(LIR_Opr reg)                                    { append(new LIR_Op1(lir_pop,  reg)); }
2259 
2260   void cmp(LIR_Condition condition, LIR_Opr left, LIR_Opr right, CodeEmitInfo* info = NULL) {
2261     append(new LIR_Op2(lir_cmp, condition, left, right, info));
2262   }
2263   void cmp(LIR_Condition condition, LIR_Opr left, int right, CodeEmitInfo* info = NULL) {
2264     cmp(condition, left, LIR_OprFact::intConst(right), info);
2265   }
2266 
2267   void cmp_mem_int(LIR_Condition condition, LIR_Opr base, int disp, int c, CodeEmitInfo* info);
2268   void cmp_reg_mem(LIR_Condition condition, LIR_Opr reg, LIR_Address* addr, CodeEmitInfo* info);
2269 
2270   void cmove(LIR_Condition condition, LIR_Opr src1, LIR_Opr src2, LIR_Opr dst, BasicType type) {
2271     append(new LIR_Op2(lir_cmove, condition, src1, src2, dst, type));
2272   }
2273 
2274   void cas_long(LIR_Opr addr, LIR_Opr cmp_value, LIR_Opr new_value,
2275                 LIR_Opr t1, LIR_Opr t2, LIR_Opr result = LIR_OprFact::illegalOpr);
2276   void cas_obj(LIR_Opr addr, LIR_Opr cmp_value, LIR_Opr new_value,
2277                LIR_Opr t1, LIR_Opr t2, LIR_Opr result = LIR_OprFact::illegalOpr);
2278   void cas_int(LIR_Opr addr, LIR_Opr cmp_value, LIR_Opr new_value,
2279                LIR_Opr t1, LIR_Opr t2, LIR_Opr result = LIR_OprFact::illegalOpr);
2280 
2281   void abs (LIR_Opr from, LIR_Opr to, LIR_Opr tmp)                { append(new LIR_Op2(lir_abs , from, tmp, to)); }
2282   void negate(LIR_Opr from, LIR_Opr to, LIR_Opr tmp = LIR_OprFact::illegalOpr)              { append(new LIR_Op2(lir_neg, from, tmp, to)); }
2283   void sqrt(LIR_Opr from, LIR_Opr to, LIR_Opr tmp)                { append(new LIR_Op2(lir_sqrt, from, tmp, to)); }
2284   void fmad(LIR_Opr from, LIR_Opr from1, LIR_Opr from2, LIR_Opr to) { append(new LIR_Op3(lir_fmad, from, from1, from2, to)); }
2285   void fmaf(LIR_Opr from, LIR_Opr from1, LIR_Opr from2, LIR_Opr to) { append(new LIR_Op3(lir_fmaf, from, from1, from2, to)); }
2286   void log10 (LIR_Opr from, LIR_Opr to, LIR_Opr tmp)              { append(new LIR_Op2(lir_log10, from, LIR_OprFact::illegalOpr, to, tmp)); }
2287   void tan (LIR_Opr from, LIR_Opr to, LIR_Opr tmp1, LIR_Opr tmp2) { append(new LIR_Op2(lir_tan , from, tmp1, to, tmp2)); }
2288 
2289   void add (LIR_Opr left, LIR_Opr right, LIR_Opr res)      { append(new LIR_Op2(lir_add, left, right, res)); }
2290   void sub (LIR_Opr left, LIR_Opr right, LIR_Opr res, CodeEmitInfo* info = NULL) { append(new LIR_Op2(lir_sub, left, right, res, info)); }
2291   void mul (LIR_Opr left, LIR_Opr right, LIR_Opr res) { append(new LIR_Op2(lir_mul, left, right, res)); }
2292   void mul (LIR_Opr left, LIR_Opr right, LIR_Opr res, LIR_Opr tmp) { append(new LIR_Op2(lir_mul, left, right, res, tmp)); }
2293   void div (LIR_Opr left, LIR_Opr right, LIR_Opr res, CodeEmitInfo* info = NULL)      { append(new LIR_Op2(lir_div, left, right, res, info)); }
2294   void div (LIR_Opr left, LIR_Opr right, LIR_Opr res, LIR_Opr tmp) { append(new LIR_Op2(lir_div, left, right, res, tmp)); }
2295   void rem (LIR_Opr left, LIR_Opr right, LIR_Opr res, CodeEmitInfo* info = NULL)      { append(new LIR_Op2(lir_rem, left, right, res, info)); }
2296 
2297   void volatile_load_mem_reg(LIR_Address* address, LIR_Opr dst, CodeEmitInfo* info, LIR_PatchCode patch_code = lir_patch_none);
2298   void volatile_load_unsafe_reg(LIR_Opr base, LIR_Opr offset, LIR_Opr dst, BasicType type, CodeEmitInfo* info, LIR_PatchCode patch_code);
2299 
2300   void load(LIR_Address* addr, LIR_Opr src, CodeEmitInfo* info = NULL, LIR_PatchCode patch_code = lir_patch_none);
2301 
2302   void store_mem_int(jint v,    LIR_Opr base, int offset_in_bytes, BasicType type, CodeEmitInfo* info, LIR_PatchCode patch_code = lir_patch_none);
2303   void store_mem_oop(jobject o, LIR_Opr base, int offset_in_bytes, BasicType type, CodeEmitInfo* info, LIR_PatchCode patch_code = lir_patch_none);
2304   void store(LIR_Opr src, LIR_Address* addr, CodeEmitInfo* info = NULL, LIR_PatchCode patch_code = lir_patch_none);
2305   void volatile_store_mem_reg(LIR_Opr src, LIR_Address* address, CodeEmitInfo* info, LIR_PatchCode patch_code = lir_patch_none);
2306   void volatile_store_unsafe_reg(LIR_Opr src, LIR_Opr base, LIR_Opr offset, BasicType type, CodeEmitInfo* info, LIR_PatchCode patch_code);
2307 
2308   void idiv(LIR_Opr left, LIR_Opr right, LIR_Opr res, LIR_Opr tmp, CodeEmitInfo* info);
2309   void idiv(LIR_Opr left, int   right, LIR_Opr res, LIR_Opr tmp, CodeEmitInfo* info);
2310   void irem(LIR_Opr left, LIR_Opr right, LIR_Opr res, LIR_Opr tmp, CodeEmitInfo* info);
2311   void irem(LIR_Opr left, int   right, LIR_Opr res, LIR_Opr tmp, CodeEmitInfo* info);
2312 
2313   void allocate_object(LIR_Opr dst, LIR_Opr t1, LIR_Opr t2, LIR_Opr t3, LIR_Opr t4, int header_size, int object_size, LIR_Opr klass, bool init_check, CodeStub* stub);
2314   void allocate_array(LIR_Opr dst, LIR_Opr len, LIR_Opr t1,LIR_Opr t2, LIR_Opr t3,LIR_Opr t4, BasicType type, LIR_Opr klass, CodeStub* stub);
2315 
2316   // jump is an unconditional branch
2317   void jump(BlockBegin* block) {
2318     append(new LIR_OpBranch(lir_cond_always, block));
2319   }
2320   void jump(CodeStub* stub) {
2321     append(new LIR_OpBranch(lir_cond_always, stub));
2322   }
2323   void branch(LIR_Condition cond, Label* lbl) {
2324     append(new LIR_OpBranch(cond, lbl));
2325   }
2326   // Should not be used for fp comparisons
2327   void branch(LIR_Condition cond, BlockBegin* block) {
2328     append(new LIR_OpBranch(cond, block));
2329   }
2330   // Should not be used for fp comparisons
2331   void branch(LIR_Condition cond, CodeStub* stub) {
2332     append(new LIR_OpBranch(cond, stub));
2333   }
2334   // Should only be used for fp comparisons
2335   void branch(LIR_Condition cond, BlockBegin* block, BlockBegin* unordered) {
2336     append(new LIR_OpBranch(cond, block, unordered));
2337   }
2338 
2339   void shift_left(LIR_Opr value, LIR_Opr count, LIR_Opr dst, LIR_Opr tmp);
2340   void shift_right(LIR_Opr value, LIR_Opr count, LIR_Opr dst, LIR_Opr tmp);
2341   void unsigned_shift_right(LIR_Opr value, LIR_Opr count, LIR_Opr dst, LIR_Opr tmp);
2342 
2343   void shift_left(LIR_Opr value, int count, LIR_Opr dst)       { shift_left(value, LIR_OprFact::intConst(count), dst, LIR_OprFact::illegalOpr); }
2344   void shift_right(LIR_Opr value, int count, LIR_Opr dst)      { shift_right(value, LIR_OprFact::intConst(count), dst, LIR_OprFact::illegalOpr); }
2345   void unsigned_shift_right(LIR_Opr value, int count, LIR_Opr dst) { unsigned_shift_right(value, LIR_OprFact::intConst(count), dst, LIR_OprFact::illegalOpr); }
2346 
2347   void lcmp2int(LIR_Opr left, LIR_Opr right, LIR_Opr dst)        { append(new LIR_Op2(lir_cmp_l2i,  left, right, dst)); }
2348   void fcmp2int(LIR_Opr left, LIR_Opr right, LIR_Opr dst, bool is_unordered_less);
2349 
2350   void call_runtime_leaf(address routine, LIR_Opr tmp, LIR_Opr result, LIR_OprList* arguments) {
2351     append(new LIR_OpRTCall(routine, tmp, result, arguments));
2352   }
2353 
2354   void call_runtime(address routine, LIR_Opr tmp, LIR_Opr result,
2355                     LIR_OprList* arguments, CodeEmitInfo* info) {
2356     append(new LIR_OpRTCall(routine, tmp, result, arguments, info));
2357   }
2358 
2359   void load_stack_address_monitor(int monitor_ix, LIR_Opr dst)  { append(new LIR_Op1(lir_monaddr, LIR_OprFact::intConst(monitor_ix), dst)); }
2360   void unlock_object(LIR_Opr hdr, LIR_Opr obj, LIR_Opr lock, LIR_Opr scratch, CodeStub* stub);
2361   void lock_object(LIR_Opr hdr, LIR_Opr obj, LIR_Opr lock, LIR_Opr scratch, CodeStub* stub, CodeEmitInfo* info, CodeStub* throw_imse_stub=NULL);
2362 
2363   void breakpoint()                                                  { append(new LIR_Op0(lir_breakpoint)); }
2364 
2365   void arraycopy(LIR_Opr src, LIR_Opr src_pos, LIR_Opr dst, LIR_Opr dst_pos, LIR_Opr length, LIR_Opr tmp, ciArrayKlass* expected_type, int flags, CodeEmitInfo* info) { append(new LIR_OpArrayCopy(src, src_pos, dst, dst_pos, length, tmp, expected_type, flags, info)); }
2366 
2367   void update_crc32(LIR_Opr crc, LIR_Opr val, LIR_Opr res)  { append(new LIR_OpUpdateCRC32(crc, val, res)); }
2368 
2369   void instanceof(LIR_Opr result, LIR_Opr object, ciKlass* klass, LIR_Opr tmp1, LIR_Opr tmp2, LIR_Opr tmp3, bool fast_check, CodeEmitInfo* info_for_patch, ciMethod* profiled_method, int profiled_bci);
2370   void store_check(LIR_Opr object, LIR_Opr array, LIR_Opr tmp1, LIR_Opr tmp2, LIR_Opr tmp3, CodeEmitInfo* info_for_exception, ciMethod* profiled_method, int profiled_bci);
2371   void check_flattened_array(LIR_Opr array, LIR_Opr value, LIR_Opr tmp, CodeStub* stub);
2372   void check_null_free_array(LIR_Opr array, LIR_Opr tmp);
2373   void substitutability_check(LIR_Opr result, LIR_Opr left, LIR_Opr right, LIR_Opr equal_result, LIR_Opr not_equal_result,
2374                               LIR_Opr tmp1, LIR_Opr tmp2,
2375                               ciKlass* left_klass, ciKlass* right_klass, LIR_Opr left_klass_op, LIR_Opr right_klass_op,
2376                               CodeEmitInfo* info, CodeStub* stub);
2377 
2378   void checkcast (LIR_Opr result, LIR_Opr object, ciKlass* klass,
2379                   LIR_Opr tmp1, LIR_Opr tmp2, LIR_Opr tmp3, bool fast_check,
2380                   CodeEmitInfo* info_for_exception, CodeEmitInfo* info_for_patch, CodeStub* stub,
2381                   ciMethod* profiled_method, int profiled_bci, bool is_null_free);
2382   // MethodData* profiling
2383   void profile_call(ciMethod* method, int bci, ciMethod* callee, LIR_Opr mdo, LIR_Opr recv, LIR_Opr t1, ciKlass* cha_klass) {
2384     append(new LIR_OpProfileCall(method, bci, callee, mdo, recv, t1, cha_klass));
2385   }
2386   void profile_type(LIR_Address* mdp, LIR_Opr obj, ciKlass* exact_klass, intptr_t current_klass, LIR_Opr tmp, bool not_null, bool no_conflict) {
2387     append(new LIR_OpProfileType(LIR_OprFact::address(mdp), obj, exact_klass, current_klass, tmp, not_null, no_conflict));
2388   }
2389   void profile_inline_type(LIR_Address* mdp, LIR_Opr obj, int flag, LIR_Opr tmp, bool not_null) {
2390     append(new LIR_OpProfileInlineType(LIR_OprFact::address(mdp), obj, flag, tmp, not_null));
2391   }
2392 
2393   void xadd(LIR_Opr src, LIR_Opr add, LIR_Opr res, LIR_Opr tmp) { append(new LIR_Op2(lir_xadd, src, add, res, tmp)); }
2394   void xchg(LIR_Opr src, LIR_Opr set, LIR_Opr res, LIR_Opr tmp) { append(new LIR_Op2(lir_xchg, src, set, res, tmp)); }
2395 #ifdef ASSERT
2396   void lir_assert(LIR_Condition condition, LIR_Opr opr1, LIR_Opr opr2, const char* msg, bool halt) { append(new LIR_OpAssert(condition, opr1, opr2, msg, halt)); }
2397 #endif
2398 };
2399 
2400 void print_LIR(BlockList* blocks);
2401 
2402 class LIR_InsertionBuffer : public CompilationResourceObj {
2403  private:
2404   LIR_List*   _lir;   // the lir list where ops of this buffer should be inserted later (NULL when uninitialized)
2405 
2406   // list of insertion points. index and count are stored alternately:
2407   // _index_and_count[i * 2]:     the index into lir list where "count" ops should be inserted
2408   // _index_and_count[i * 2 + 1]: the number of ops to be inserted at index
2409   intStack    _index_and_count;
2410 
2411   // the LIR_Ops to be inserted
2412   LIR_OpList  _ops;
2413 
2414   void append_new(int index, int count)  { _index_and_count.append(index); _index_and_count.append(count); }
2415   void set_index_at(int i, int value)    { _index_and_count.at_put((i << 1),     value); }
2416   void set_count_at(int i, int value)    { _index_and_count.at_put((i << 1) + 1, value); }
2417 
2418 #ifdef ASSERT
2419   void verify();
2420 #endif
2421  public:
2422   LIR_InsertionBuffer() : _lir(NULL), _index_and_count(8), _ops(8) { }
2423 
2424   // must be called before using the insertion buffer
2425   void init(LIR_List* lir)  { assert(!initialized(), "already initialized"); _lir = lir; _index_and_count.clear(); _ops.clear(); }
2426   bool initialized() const  { return _lir != NULL; }
2427   // called automatically when the buffer is appended to the LIR_List
2428   void finish()             { _lir = NULL; }
2429 
2430   // accessors
2431   LIR_List*  lir_list() const             { return _lir; }
2432   int number_of_insertion_points() const  { return _index_and_count.length() >> 1; }
2433   int index_at(int i) const               { return _index_and_count.at((i << 1));     }
2434   int count_at(int i) const               { return _index_and_count.at((i << 1) + 1); }
2435 
2436   int number_of_ops() const               { return _ops.length(); }
2437   LIR_Op* op_at(int i) const              { return _ops.at(i); }
2438 
2439   // append an instruction to the buffer
2440   void append(int index, LIR_Op* op);
2441 
2442   // instruction
2443   void move(int index, LIR_Opr src, LIR_Opr dst, CodeEmitInfo* info = NULL) { append(index, new LIR_Op1(lir_move, src, dst, dst->type(), lir_patch_none, info)); }
2444 };
2445 
2446 
2447 //
2448 // LIR_OpVisitState is used for manipulating LIR_Ops in an abstract way.
2449 // Calling a LIR_Op's visit function with a LIR_OpVisitState causes
2450 // information about the input, output and temporaries used by the
2451 // op to be recorded.  It also records whether the op has call semantics
2452 // and also records all the CodeEmitInfos used by this op.
2453 //
2454 
2455 
2456 class LIR_OpVisitState: public StackObj {
2457  public:
2458   typedef enum { inputMode, firstMode = inputMode, tempMode, outputMode, numModes, invalidMode = -1 } OprMode;
2459 
2460   enum {
2461     maxNumberOfOperands = 20,
2462     maxNumberOfInfos = 4
2463   };
2464 
2465  private:
2466   LIR_Op*          _op;
2467 
2468   // optimization: the operands and infos are not stored in a variable-length
2469   //               list, but in a fixed-size array to save time of size checks and resizing
2470   int              _oprs_len[numModes];
2471   LIR_Opr*         _oprs_new[numModes][maxNumberOfOperands];
2472   int _info_len;
2473   CodeEmitInfo*    _info_new[maxNumberOfInfos];
2474 
2475   bool             _has_call;
2476   bool             _has_slow_case;
2477 
2478 
2479   // only include register operands
2480   // addresses are decomposed to the base and index registers
2481   // constants and stack operands are ignored
2482   void append(LIR_Opr& opr, OprMode mode) {
2483     assert(opr->is_valid(), "should not call this otherwise");
2484     assert(mode >= 0 && mode < numModes, "bad mode");
2485 
2486     if (opr->is_register()) {
2487        assert(_oprs_len[mode] < maxNumberOfOperands, "array overflow");
2488       _oprs_new[mode][_oprs_len[mode]++] = &opr;
2489 
2490     } else if (opr->is_pointer()) {
2491       LIR_Address* address = opr->as_address_ptr();
2492       if (address != NULL) {
2493         // special handling for addresses: add base and index register of the address
2494         // both are always input operands or temp if we want to extend
2495         // their liveness!
2496         if (mode == outputMode) {
2497           mode = inputMode;
2498         }
2499         assert (mode == inputMode || mode == tempMode, "input or temp only for addresses");
2500         if (address->_base->is_valid()) {
2501           assert(address->_base->is_register(), "must be");
2502           assert(_oprs_len[mode] < maxNumberOfOperands, "array overflow");
2503           _oprs_new[mode][_oprs_len[mode]++] = &address->_base;
2504         }
2505         if (address->_index->is_valid()) {
2506           assert(address->_index->is_register(), "must be");
2507           assert(_oprs_len[mode] < maxNumberOfOperands, "array overflow");
2508           _oprs_new[mode][_oprs_len[mode]++] = &address->_index;
2509         }
2510 
2511       } else {
2512         assert(opr->is_constant(), "constant operands are not processed");
2513       }
2514     } else {
2515       assert(opr->is_stack(), "stack operands are not processed");
2516     }
2517   }
2518 
2519   void append(CodeEmitInfo* info) {
2520     assert(info != NULL, "should not call this otherwise");
2521     assert(_info_len < maxNumberOfInfos, "array overflow");
2522     _info_new[_info_len++] = info;
2523   }
2524 
2525  public:
2526   LIR_OpVisitState()         { reset(); }
2527 
2528   LIR_Op* op() const         { return _op; }
2529   void set_op(LIR_Op* op)    { reset(); _op = op; }
2530 
2531   bool has_call() const      { return _has_call; }
2532   bool has_slow_case() const { return _has_slow_case; }
2533 
2534   void reset() {
2535     _op = NULL;
2536     _has_call = false;
2537     _has_slow_case = false;
2538 
2539     _oprs_len[inputMode] = 0;
2540     _oprs_len[tempMode] = 0;
2541     _oprs_len[outputMode] = 0;
2542     _info_len = 0;
2543   }
2544 
2545 
2546   int opr_count(OprMode mode) const {
2547     assert(mode >= 0 && mode < numModes, "bad mode");
2548     return _oprs_len[mode];
2549   }
2550 
2551   LIR_Opr opr_at(OprMode mode, int index) const {
2552     assert(mode >= 0 && mode < numModes, "bad mode");
2553     assert(index >= 0 && index < _oprs_len[mode], "index out of bound");
2554     return *_oprs_new[mode][index];
2555   }
2556 
2557   void set_opr_at(OprMode mode, int index, LIR_Opr opr) const {
2558     assert(mode >= 0 && mode < numModes, "bad mode");
2559     assert(index >= 0 && index < _oprs_len[mode], "index out of bound");
2560     *_oprs_new[mode][index] = opr;
2561   }
2562 
2563   int info_count() const {
2564     return _info_len;
2565   }
2566 
2567   CodeEmitInfo* info_at(int index) const {
2568     assert(index < _info_len, "index out of bounds");
2569     return _info_new[index];
2570   }
2571 
2572   XHandlers* all_xhandler();
2573 
2574   // collects all register operands of the instruction
2575   void visit(LIR_Op* op);
2576 
2577 #ifdef ASSERT
2578   // check that an operation has no operands
2579   bool no_operands(LIR_Op* op);
2580 #endif
2581 
2582   // LIR_Op visitor functions use these to fill in the state
2583   void do_input(LIR_Opr& opr)             { append(opr, LIR_OpVisitState::inputMode); }
2584   void do_output(LIR_Opr& opr)            { append(opr, LIR_OpVisitState::outputMode); }
2585   void do_temp(LIR_Opr& opr)              { append(opr, LIR_OpVisitState::tempMode); }
2586   void do_info(CodeEmitInfo* info)        { append(info); }
2587 
2588   void do_stub(CodeStub* stub);
2589   void do_call()                          { _has_call = true; }
2590   void do_slow_case()                     { _has_slow_case = true; }
2591   void do_slow_case(CodeEmitInfo* info) {
2592     _has_slow_case = true;
2593     append(info);
2594   }
2595 };
2596 
2597 
2598 inline LIR_Opr LIR_OprDesc::illegalOpr()   { return LIR_OprFact::illegalOpr; };
2599 
2600 #endif // SHARE_C1_C1_LIR_HPP