1 /*
   2  * Copyright (c) 2000, 2022, 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_OprPtr
  50 //      LIR_Const
  51 //      LIR_Address
  52 //---------------------------------------------------------------------
  53 class LIR_OprPtr;
  54 class LIR_Const;
  55 class LIR_Address;
  56 class LIR_OprVisitor;
  57 class LIR_Opr;
  58 
  59 typedef int          RegNr;
  60 
  61 typedef GrowableArray<LIR_Opr> LIR_OprList;
  62 typedef GrowableArray<LIR_Op*> LIR_OpArray;
  63 typedef GrowableArray<LIR_Op*> LIR_OpList;
  64 
  65 // define LIR_OprPtr early so LIR_Opr can refer to it
  66 class LIR_OprPtr: public CompilationResourceObj {
  67  public:
  68   bool is_oop_pointer() const                    { return (type() == T_OBJECT); }
  69   bool is_float_kind() const                     { BasicType t = type(); return (t == T_FLOAT) || (t == T_DOUBLE); }
  70 
  71   virtual LIR_Const*  as_constant()              { return NULL; }
  72   virtual LIR_Address* as_address()              { return NULL; }
  73   virtual BasicType type() const                 = 0;
  74   virtual void print_value_on(outputStream* out) const = 0;
  75 };
  76 
  77 
  78 
  79 // LIR constants
  80 class LIR_Const: public LIR_OprPtr {
  81  private:
  82   JavaValue _value;
  83 
  84   void type_check(BasicType t) const   { assert(type() == t, "type check"); }
  85   void type_check(BasicType t1, BasicType t2) const   { assert(type() == t1 || type() == t2, "type check"); }
  86   void type_check(BasicType t1, BasicType t2, BasicType t3) const   { assert(type() == t1 || type() == t2 || type() == t3, "type check"); }
  87 
  88  public:
  89   LIR_Const(jint i, bool is_address=false)       { _value.set_type(is_address?T_ADDRESS:T_INT); _value.set_jint(i); }
  90   LIR_Const(jlong l)                             { _value.set_type(T_LONG);    _value.set_jlong(l); }
  91   LIR_Const(jfloat f)                            { _value.set_type(T_FLOAT);   _value.set_jfloat(f); }
  92   LIR_Const(jdouble d)                           { _value.set_type(T_DOUBLE);  _value.set_jdouble(d); }
  93   LIR_Const(jobject o)                           { _value.set_type(T_OBJECT);  _value.set_jobject(o); }
  94   LIR_Const(void* p) {
  95 #ifdef _LP64
  96     assert(sizeof(jlong) >= sizeof(p), "too small");;
  97     _value.set_type(T_LONG);    _value.set_jlong((jlong)p);
  98 #else
  99     assert(sizeof(jint) >= sizeof(p), "too small");;
 100     _value.set_type(T_INT);     _value.set_jint((jint)p);
 101 #endif
 102   }
 103   LIR_Const(Metadata* m) {
 104     _value.set_type(T_METADATA);
 105 #ifdef _LP64
 106     _value.set_jlong((jlong)m);
 107 #else
 108     _value.set_jint((jint)m);
 109 #endif // _LP64
 110   }
 111 
 112   virtual BasicType type()       const { return _value.get_type(); }
 113   virtual LIR_Const* as_constant()     { return this; }
 114 
 115   jint      as_jint()    const         { type_check(T_INT, T_ADDRESS); return _value.get_jint(); }
 116   jlong     as_jlong()   const         { type_check(T_LONG  ); return _value.get_jlong(); }
 117   jfloat    as_jfloat()  const         { type_check(T_FLOAT ); return _value.get_jfloat(); }
 118   jdouble   as_jdouble() const         { type_check(T_DOUBLE); return _value.get_jdouble(); }
 119   jobject   as_jobject() const         { type_check(T_OBJECT); return _value.get_jobject(); }
 120   jint      as_jint_lo() const         { type_check(T_LONG  ); return low(_value.get_jlong()); }
 121   jint      as_jint_hi() const         { type_check(T_LONG  ); return high(_value.get_jlong()); }
 122 
 123 #ifdef _LP64
 124   address   as_pointer() const         { type_check(T_LONG  ); return (address)_value.get_jlong(); }
 125   Metadata* as_metadata() const        { type_check(T_METADATA); return (Metadata*)_value.get_jlong(); }
 126 #else
 127   address   as_pointer() const         { type_check(T_INT   ); return (address)_value.get_jint(); }
 128   Metadata* as_metadata() const        { type_check(T_METADATA); return (Metadata*)_value.get_jint(); }
 129 #endif
 130 
 131 
 132   jint      as_jint_bits() const       { type_check(T_FLOAT, T_INT, T_ADDRESS); return _value.get_jint(); }
 133   jint      as_jint_lo_bits() const    {
 134     if (type() == T_DOUBLE) {
 135       return low(jlong_cast(_value.get_jdouble()));
 136     } else {
 137       return as_jint_lo();
 138     }
 139   }
 140   jint      as_jint_hi_bits() const    {
 141     if (type() == T_DOUBLE) {
 142       return high(jlong_cast(_value.get_jdouble()));
 143     } else {
 144       return as_jint_hi();
 145     }
 146   }
 147   jlong      as_jlong_bits() const    {
 148     if (type() == T_DOUBLE) {
 149       return jlong_cast(_value.get_jdouble());
 150     } else {
 151       return as_jlong();
 152     }
 153   }
 154 
 155   virtual void print_value_on(outputStream* out) const PRODUCT_RETURN;
 156 
 157 
 158   bool is_zero_float() {
 159     jfloat f = as_jfloat();
 160     jfloat ok = 0.0f;
 161     return jint_cast(f) == jint_cast(ok);
 162   }
 163 
 164   bool is_one_float() {
 165     jfloat f = as_jfloat();
 166     return !g_isnan(f) && g_isfinite(f) && f == 1.0;
 167   }
 168 
 169   bool is_zero_double() {
 170     jdouble d = as_jdouble();
 171     jdouble ok = 0.0;
 172     return jlong_cast(d) == jlong_cast(ok);
 173   }
 174 
 175   bool is_one_double() {
 176     jdouble d = as_jdouble();
 177     return !g_isnan(d) && g_isfinite(d) && d == 1.0;
 178   }
 179 };
 180 
 181 
 182 //---------------------LIR Operand descriptor------------------------------------
 183 //
 184 // The class LIR_Opr represents a LIR instruction operand;
 185 // it can be a register (ALU/FPU), stack location or a constant;
 186 // Constants and addresses are represented as resource area allocated
 187 // structures (see above), and pointers are stored in the _value field (cast to
 188 // an intptr_t).
 189 // Registers and stack locations are represented inline as integers.
 190 // (see value function).
 191 
 192 // Previously, this class was derived from CompilationResourceObj.
 193 // However, deriving from any of the "Obj" types in allocation.hpp seems
 194 // detrimental, since in some build modes it would add a vtable to this class,
 195 // which make it no longer be a 1-word trivially-copyable wrapper object,
 196 // which is the entire point of it.
 197 
 198 class LIR_Opr {
 199  public:
 200   // value structure:
 201   //     data       opr-type opr-kind
 202   // +--------------+-------+-------+
 203   // [max...........|7 6 5 4|3 2 1 0]
 204   //                               ^
 205   //                         is_pointer bit
 206   //
 207   // lowest bit cleared, means it is a structure pointer
 208   // we need  4 bits to represent types
 209 
 210  private:
 211   friend class LIR_OprFact;
 212 
 213   intptr_t _value;
 214   // Conversion
 215   intptr_t value() const                         { return _value; }
 216 
 217   bool check_value_mask(intptr_t mask, intptr_t masked_value) const {
 218     return (value() & mask) == masked_value;
 219   }
 220 
 221   enum OprKind {
 222       pointer_value      = 0
 223     , stack_value        = 1
 224     , cpu_register       = 3
 225     , fpu_register       = 5
 226     , illegal_value      = 7
 227   };
 228 
 229   enum OprBits {
 230       pointer_bits   = 1
 231     , kind_bits      = 3
 232     , type_bits      = 4
 233     , size_bits      = 2
 234     , destroys_bits  = 1
 235     , virtual_bits   = 1
 236     , is_xmm_bits    = 1
 237     , last_use_bits  = 1
 238     , is_fpu_stack_offset_bits = 1        // used in assertion checking on x86 for FPU stack slot allocation
 239     , non_data_bits  = pointer_bits + kind_bits + type_bits + size_bits + destroys_bits + virtual_bits
 240                        + is_xmm_bits + last_use_bits + is_fpu_stack_offset_bits
 241     , data_bits      = BitsPerInt - non_data_bits
 242     , reg_bits       = data_bits / 2      // for two registers in one value encoding
 243   };
 244 
 245   enum OprShift {
 246       kind_shift     = 0
 247     , type_shift     = kind_shift     + kind_bits
 248     , size_shift     = type_shift     + type_bits
 249     , destroys_shift = size_shift     + size_bits
 250     , last_use_shift = destroys_shift + destroys_bits
 251     , is_fpu_stack_offset_shift = last_use_shift + last_use_bits
 252     , virtual_shift  = is_fpu_stack_offset_shift + is_fpu_stack_offset_bits
 253     , is_xmm_shift   = virtual_shift + virtual_bits
 254     , data_shift     = is_xmm_shift + is_xmm_bits
 255     , reg1_shift = data_shift
 256     , reg2_shift = data_shift + reg_bits
 257 
 258   };
 259 
 260   enum OprSize {
 261       single_size = 0 << size_shift
 262     , double_size = 1 << size_shift
 263   };
 264 
 265   enum OprMask {
 266       kind_mask      = right_n_bits(kind_bits)
 267     , type_mask      = right_n_bits(type_bits) << type_shift
 268     , size_mask      = right_n_bits(size_bits) << size_shift
 269     , last_use_mask  = right_n_bits(last_use_bits) << last_use_shift
 270     , is_fpu_stack_offset_mask = right_n_bits(is_fpu_stack_offset_bits) << is_fpu_stack_offset_shift
 271     , virtual_mask   = right_n_bits(virtual_bits) << virtual_shift
 272     , is_xmm_mask    = right_n_bits(is_xmm_bits) << is_xmm_shift
 273     , pointer_mask   = right_n_bits(pointer_bits)
 274     , lower_reg_mask = right_n_bits(reg_bits)
 275     , no_type_mask   = (int)(~(type_mask | last_use_mask | is_fpu_stack_offset_mask))
 276   };
 277 
 278   uintptr_t data() const                         { return value() >> data_shift; }
 279   int lo_reg_half() const                        { return data() & lower_reg_mask; }
 280   int hi_reg_half() const                        { return (data() >> reg_bits) & lower_reg_mask; }
 281   OprKind kind_field() const                     { return (OprKind)(value() & kind_mask); }
 282   OprSize size_field() const                     { return (OprSize)(value() & size_mask); }
 283 
 284   static char type_char(BasicType t);
 285 
 286  public:
 287   LIR_Opr() : _value(0) {}
 288   LIR_Opr(intptr_t val) : _value(val) {}
 289   LIR_Opr(LIR_OprPtr *val) : _value(reinterpret_cast<intptr_t>(val)) {}
 290   bool operator==(const LIR_Opr &other) const { return _value == other._value; }
 291   bool operator!=(const LIR_Opr &other) const { return _value != other._value; }
 292   explicit operator bool() const { return _value != 0; }
 293 
 294   // UGLY HACK: make this value object look like a pointer (to itself). This
 295   // operator overload should be removed, and all callers updated from
 296   // `opr->fn()` to `opr.fn()`.
 297   const LIR_Opr* operator->() const { return this; }
 298   LIR_Opr* operator->() { return this; }
 299 
 300   enum {
 301     vreg_base = ConcreteRegisterImpl::number_of_registers,
 302     vreg_max = (1 << data_bits) - 1
 303   };
 304 
 305   static inline LIR_Opr illegalOpr();
 306   static inline LIR_Opr nullOpr();
 307 
 308   enum OprType {
 309       unknown_type  = 0 << type_shift    // means: not set (catch uninitialized types)
 310     , int_type      = 1 << type_shift
 311     , long_type     = 2 << type_shift
 312     , object_type   = 3 << type_shift
 313     , address_type  = 4 << type_shift
 314     , float_type    = 5 << type_shift
 315     , double_type   = 6 << type_shift
 316     , metadata_type = 7 << type_shift
 317   };
 318   friend OprType as_OprType(BasicType t);
 319   friend BasicType as_BasicType(OprType t);
 320 
 321   OprType type_field_valid() const               { assert(is_register() || is_stack(), "should not be called otherwise"); return (OprType)(value() & type_mask); }
 322   OprType type_field() const                     { return is_illegal() ? unknown_type : (OprType)(value() & type_mask); }
 323 
 324   static OprSize size_for(BasicType t) {
 325     switch (t) {
 326       case T_LONG:
 327       case T_DOUBLE:
 328         return double_size;
 329         break;
 330 
 331       case T_FLOAT:
 332       case T_BOOLEAN:
 333       case T_CHAR:
 334       case T_BYTE:
 335       case T_SHORT:
 336       case T_INT:
 337       case T_ADDRESS:
 338       case T_OBJECT:
 339       case T_ARRAY:
 340       case T_METADATA:
 341         return single_size;
 342         break;
 343 
 344       default:
 345         ShouldNotReachHere();
 346         return single_size;
 347       }
 348   }
 349 
 350 
 351   void validate_type() const PRODUCT_RETURN;
 352 
 353   BasicType type() const {
 354     if (is_pointer()) {
 355       return pointer()->type();
 356     }
 357     return as_BasicType(type_field());
 358   }
 359 
 360 
 361   ValueType* value_type() const                  { return as_ValueType(type()); }
 362 
 363   char type_char() const                         { return type_char((is_pointer()) ? pointer()->type() : type()); }
 364 
 365   bool is_equal(LIR_Opr opr) const         { return *this == opr; }
 366   // checks whether types are same
 367   bool is_same_type(LIR_Opr opr) const     {
 368     assert(type_field() != unknown_type &&
 369            opr->type_field() != unknown_type, "shouldn't see unknown_type");
 370     return type_field() == opr->type_field();
 371   }
 372   bool is_same_register(LIR_Opr opr) {
 373     return (is_register() && opr->is_register() &&
 374             kind_field() == opr->kind_field() &&
 375             (value() & no_type_mask) == (opr->value() & no_type_mask));
 376   }
 377 
 378   bool is_pointer() const      { return check_value_mask(pointer_mask, pointer_value); }
 379   bool is_illegal() const      { return kind_field() == illegal_value; }
 380   bool is_valid() const        { return kind_field() != illegal_value; }
 381 
 382   bool is_register() const     { return is_cpu_register() || is_fpu_register(); }
 383   bool is_virtual() const      { return is_virtual_cpu()  || is_virtual_fpu();  }
 384 
 385   bool is_constant() const     { return is_pointer() && pointer()->as_constant() != NULL; }
 386   bool is_address() const      { return is_pointer() && pointer()->as_address() != NULL; }
 387 
 388   bool is_float_kind() const   { return is_pointer() ? pointer()->is_float_kind() : (kind_field() == fpu_register); }
 389   bool is_oop() const;
 390 
 391   // semantic for fpu- and xmm-registers:
 392   // * is_float and is_double return true for xmm_registers
 393   //   (so is_single_fpu and is_single_xmm are true)
 394   // * So you must always check for is_???_xmm prior to is_???_fpu to
 395   //   distinguish between fpu- and xmm-registers
 396 
 397   bool is_stack() const        { validate_type(); return check_value_mask(kind_mask,                stack_value);                 }
 398   bool is_single_stack() const { validate_type(); return check_value_mask(kind_mask | size_mask,    stack_value  | single_size);  }
 399   bool is_double_stack() const { validate_type(); return check_value_mask(kind_mask | size_mask,    stack_value  | double_size);  }
 400 
 401   bool is_cpu_register() const { validate_type(); return check_value_mask(kind_mask,                cpu_register);                }
 402   bool is_virtual_cpu() const  { validate_type(); return check_value_mask(kind_mask | virtual_mask, cpu_register | virtual_mask); }
 403   bool is_fixed_cpu() const    { validate_type(); return check_value_mask(kind_mask | virtual_mask, cpu_register);                }
 404   bool is_single_cpu() const   { validate_type(); return check_value_mask(kind_mask | size_mask,    cpu_register | single_size);  }
 405   bool is_double_cpu() const   { validate_type(); return check_value_mask(kind_mask | size_mask,    cpu_register | double_size);  }
 406 
 407   bool is_fpu_register() const { validate_type(); return check_value_mask(kind_mask,                fpu_register);                }
 408   bool is_virtual_fpu() const  { validate_type(); return check_value_mask(kind_mask | virtual_mask, fpu_register | virtual_mask); }
 409   bool is_fixed_fpu() const    { validate_type(); return check_value_mask(kind_mask | virtual_mask, fpu_register);                }
 410   bool is_single_fpu() const   { validate_type(); return check_value_mask(kind_mask | size_mask,    fpu_register | single_size);  }
 411   bool is_double_fpu() const   { validate_type(); return check_value_mask(kind_mask | size_mask,    fpu_register | double_size);  }
 412 
 413   bool is_xmm_register() const { validate_type(); return check_value_mask(kind_mask | is_xmm_mask,             fpu_register | is_xmm_mask); }
 414   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); }
 415   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); }
 416 
 417   // fast accessor functions for special bits that do not work for pointers
 418   // (in this functions, the check for is_pointer() is omitted)
 419   bool is_single_word() const      { assert(is_register() || is_stack(), "type check"); return check_value_mask(size_mask, single_size); }
 420   bool is_double_word() const      { assert(is_register() || is_stack(), "type check"); return check_value_mask(size_mask, double_size); }
 421   bool is_virtual_register() const { assert(is_register(),               "type check"); return check_value_mask(virtual_mask, virtual_mask); }
 422   bool is_oop_register() const     { assert(is_register() || is_stack(), "type check"); return type_field_valid() == object_type; }
 423   BasicType type_register() const  { assert(is_register() || is_stack(), "type check"); return as_BasicType(type_field_valid());  }
 424 
 425   bool is_last_use() const         { assert(is_register(), "only works for registers"); return (value() & last_use_mask) != 0; }
 426   bool is_fpu_stack_offset() const { assert(is_register(), "only works for registers"); return (value() & is_fpu_stack_offset_mask) != 0; }
 427   LIR_Opr make_last_use()          { assert(is_register(), "only works for registers"); return (LIR_Opr)(value() | last_use_mask); }
 428   LIR_Opr make_fpu_stack_offset()  { assert(is_register(), "only works for registers"); return (LIR_Opr)(value() | is_fpu_stack_offset_mask); }
 429 
 430 
 431   int single_stack_ix() const  { assert(is_single_stack() && !is_virtual(), "type check"); return (int)data(); }
 432   int double_stack_ix() const  { assert(is_double_stack() && !is_virtual(), "type check"); return (int)data(); }
 433   RegNr cpu_regnr() const      { assert(is_single_cpu()   && !is_virtual(), "type check"); return (RegNr)data(); }
 434   RegNr cpu_regnrLo() const    { assert(is_double_cpu()   && !is_virtual(), "type check"); return (RegNr)lo_reg_half(); }
 435   RegNr cpu_regnrHi() const    { assert(is_double_cpu()   && !is_virtual(), "type check"); return (RegNr)hi_reg_half(); }
 436   RegNr fpu_regnr() const      { assert(is_single_fpu()   && !is_virtual(), "type check"); return (RegNr)data(); }
 437   RegNr fpu_regnrLo() const    { assert(is_double_fpu()   && !is_virtual(), "type check"); return (RegNr)lo_reg_half(); }
 438   RegNr fpu_regnrHi() const    { assert(is_double_fpu()   && !is_virtual(), "type check"); return (RegNr)hi_reg_half(); }
 439   RegNr xmm_regnr() const      { assert(is_single_xmm()   && !is_virtual(), "type check"); return (RegNr)data(); }
 440   RegNr xmm_regnrLo() const    { assert(is_double_xmm()   && !is_virtual(), "type check"); return (RegNr)lo_reg_half(); }
 441   RegNr xmm_regnrHi() const    { assert(is_double_xmm()   && !is_virtual(), "type check"); return (RegNr)hi_reg_half(); }
 442   int   vreg_number() const    { assert(is_virtual(),                       "type check"); return (RegNr)data(); }
 443 
 444   LIR_OprPtr* pointer() const { assert(_value != 0 && is_pointer(), "nullness and type check"); return (LIR_OprPtr*)_value; }
 445   LIR_Const* as_constant_ptr() const             { return pointer()->as_constant(); }
 446   LIR_Address* as_address_ptr() const            { return pointer()->as_address(); }
 447 
 448   Register as_register()    const;
 449   Register as_register_lo() const;
 450   Register as_register_hi() const;
 451 
 452   Register as_pointer_register() {
 453 #ifdef _LP64
 454     if (is_double_cpu()) {
 455       assert(as_register_lo() == as_register_hi(), "should be a single register");
 456       return as_register_lo();
 457     }
 458 #endif
 459     return as_register();
 460   }
 461 
 462   FloatRegister as_float_reg   () const;
 463   FloatRegister as_double_reg  () const;
 464 #ifdef X86
 465   XMMRegister as_xmm_float_reg () const;
 466   XMMRegister as_xmm_double_reg() const;
 467   // for compatibility with RInfo
 468   int fpu() const { return lo_reg_half(); }
 469 #endif
 470 
 471   jint      as_jint()    const { return as_constant_ptr()->as_jint(); }
 472   jlong     as_jlong()   const { return as_constant_ptr()->as_jlong(); }
 473   jfloat    as_jfloat()  const { return as_constant_ptr()->as_jfloat(); }
 474   jdouble   as_jdouble() const { return as_constant_ptr()->as_jdouble(); }
 475   jobject   as_jobject() const { return as_constant_ptr()->as_jobject(); }
 476 
 477   void print() const PRODUCT_RETURN;
 478   void print(outputStream* out) const PRODUCT_RETURN;
 479 };
 480 
 481 inline LIR_Opr::OprType as_OprType(BasicType type) {
 482   switch (type) {
 483   case T_INT:      return LIR_Opr::int_type;
 484   case T_LONG:     return LIR_Opr::long_type;
 485   case T_FLOAT:    return LIR_Opr::float_type;
 486   case T_DOUBLE:   return LIR_Opr::double_type;
 487   case T_OBJECT:
 488   case T_ARRAY:    return LIR_Opr::object_type;
 489   case T_ADDRESS:  return LIR_Opr::address_type;
 490   case T_METADATA: return LIR_Opr::metadata_type;
 491   case T_ILLEGAL:  // fall through
 492   default: ShouldNotReachHere(); return LIR_Opr::unknown_type;
 493   }
 494 }
 495 
 496 inline BasicType as_BasicType(LIR_Opr::OprType t) {
 497   switch (t) {
 498   case LIR_Opr::int_type:     return T_INT;
 499   case LIR_Opr::long_type:    return T_LONG;
 500   case LIR_Opr::float_type:   return T_FLOAT;
 501   case LIR_Opr::double_type:  return T_DOUBLE;
 502   case LIR_Opr::object_type:  return T_OBJECT;
 503   case LIR_Opr::address_type: return T_ADDRESS;
 504   case LIR_Opr::metadata_type:return T_METADATA;
 505   case LIR_Opr::unknown_type: // fall through
 506   default: ShouldNotReachHere();  return T_ILLEGAL;
 507   }
 508 }
 509 
 510 
 511 // LIR_Address
 512 class LIR_Address: public LIR_OprPtr {
 513  friend class LIR_OpVisitState;
 514 
 515  public:
 516   // NOTE: currently these must be the log2 of the scale factor (and
 517   // must also be equivalent to the ScaleFactor enum in
 518   // assembler_i486.hpp)
 519   enum Scale {
 520     times_1  =  0,
 521     times_2  =  1,
 522     times_4  =  2,
 523     times_8  =  3
 524   };
 525 
 526  private:
 527   LIR_Opr   _base;
 528   LIR_Opr   _index;
 529   Scale     _scale;
 530   intx      _disp;
 531   BasicType _type;
 532 
 533  public:
 534   LIR_Address(LIR_Opr base, LIR_Opr index, BasicType type):
 535        _base(base)
 536      , _index(index)
 537      , _scale(times_1)
 538      , _disp(0)
 539      , _type(type) { verify(); }
 540 
 541   LIR_Address(LIR_Opr base, intx disp, BasicType type):
 542        _base(base)
 543      , _index(LIR_Opr::illegalOpr())
 544      , _scale(times_1)
 545      , _disp(disp)
 546      , _type(type) { verify(); }
 547 
 548   LIR_Address(LIR_Opr base, BasicType type):
 549        _base(base)
 550      , _index(LIR_Opr::illegalOpr())
 551      , _scale(times_1)
 552      , _disp(0)
 553      , _type(type) { verify(); }
 554 
 555   LIR_Address(LIR_Opr base, LIR_Opr index, intx disp, BasicType type):
 556        _base(base)
 557      , _index(index)
 558      , _scale(times_1)
 559      , _disp(disp)
 560      , _type(type) { verify(); }
 561 
 562   LIR_Address(LIR_Opr base, LIR_Opr index, Scale scale, intx disp, BasicType type):
 563        _base(base)
 564      , _index(index)
 565      , _scale(scale)
 566      , _disp(disp)
 567      , _type(type) { verify(); }
 568 
 569   LIR_Opr base()  const                          { return _base;  }
 570   LIR_Opr index() const                          { return _index; }
 571   Scale   scale() const                          { return _scale; }
 572   intx    disp()  const                          { return _disp;  }
 573 
 574   bool equals(LIR_Address* other) const          { return base() == other->base() && index() == other->index() && disp() == other->disp() && scale() == other->scale(); }
 575 
 576   virtual LIR_Address* as_address()              { return this;   }
 577   virtual BasicType type() const                 { return _type; }
 578   virtual void print_value_on(outputStream* out) const PRODUCT_RETURN;
 579 
 580   void verify() const PRODUCT_RETURN;
 581 
 582   static Scale scale(BasicType type);
 583 };
 584 
 585 
 586 // operand factory
 587 class LIR_OprFact: public AllStatic {
 588  public:
 589 
 590   static LIR_Opr illegalOpr;
 591   static LIR_Opr nullOpr;
 592 
 593   static LIR_Opr single_cpu(int reg) {
 594     return (LIR_Opr)(intptr_t)((reg  << LIR_Opr::reg1_shift) |
 595                                LIR_Opr::int_type             |
 596                                LIR_Opr::cpu_register         |
 597                                LIR_Opr::single_size);
 598   }
 599   static LIR_Opr single_cpu_oop(int reg) {
 600     return (LIR_Opr)(intptr_t)((reg  << LIR_Opr::reg1_shift) |
 601                                LIR_Opr::object_type          |
 602                                LIR_Opr::cpu_register         |
 603                                LIR_Opr::single_size);
 604   }
 605   static LIR_Opr single_cpu_address(int reg) {
 606     return (LIR_Opr)(intptr_t)((reg  << LIR_Opr::reg1_shift) |
 607                                LIR_Opr::address_type         |
 608                                LIR_Opr::cpu_register         |
 609                                LIR_Opr::single_size);
 610   }
 611   static LIR_Opr single_cpu_metadata(int reg) {
 612     return (LIR_Opr)(intptr_t)((reg  << LIR_Opr::reg1_shift) |
 613                                LIR_Opr::metadata_type        |
 614                                LIR_Opr::cpu_register         |
 615                                LIR_Opr::single_size);
 616   }
 617   static LIR_Opr double_cpu(int reg1, int reg2) {
 618     LP64_ONLY(assert(reg1 == reg2, "must be identical"));
 619     return (LIR_Opr)(intptr_t)((reg1 << LIR_Opr::reg1_shift) |
 620                                (reg2 << LIR_Opr::reg2_shift) |
 621                                LIR_Opr::long_type            |
 622                                LIR_Opr::cpu_register         |
 623                                LIR_Opr::double_size);
 624   }
 625 
 626   static LIR_Opr single_fpu(int reg) {
 627     return (LIR_Opr)(intptr_t)((reg  << LIR_Opr::reg1_shift) |
 628                                LIR_Opr::float_type           |
 629                                LIR_Opr::fpu_register         |
 630                                LIR_Opr::single_size);
 631   }
 632 
 633   // Platform dependent.
 634   static LIR_Opr double_fpu(int reg1, int reg2 = -1 /*fnoreg*/);
 635 
 636 #ifdef ARM32
 637   static LIR_Opr single_softfp(int reg) {
 638     return (LIR_Opr)(intptr_t)((reg  << LIR_Opr::reg1_shift) |
 639                                LIR_Opr::float_type           |
 640                                LIR_Opr::cpu_register         |
 641                                LIR_Opr::single_size);
 642   }
 643   static LIR_Opr double_softfp(int reg1, int reg2) {
 644     return (LIR_Opr)(intptr_t)((reg1 << LIR_Opr::reg1_shift) |
 645                                (reg2 << LIR_Opr::reg2_shift) |
 646                                LIR_Opr::double_type          |
 647                                LIR_Opr::cpu_register         |
 648                                LIR_Opr::double_size);
 649   }
 650 #endif // ARM32
 651 
 652 #if defined(X86)
 653   static LIR_Opr single_xmm(int reg) {
 654     return (LIR_Opr)(intptr_t)((reg << LIR_Opr::reg1_shift) |
 655                                LIR_Opr::float_type          |
 656                                LIR_Opr::fpu_register        |
 657                                LIR_Opr::single_size         |
 658                                LIR_Opr::is_xmm_mask);
 659   }
 660   static LIR_Opr double_xmm(int reg) {
 661     return (LIR_Opr)(intptr_t)((reg << LIR_Opr::reg1_shift) |
 662                                (reg << LIR_Opr::reg2_shift) |
 663                                LIR_Opr::double_type         |
 664                                LIR_Opr::fpu_register        |
 665                                LIR_Opr::double_size         |
 666                                LIR_Opr::is_xmm_mask);
 667   }
 668 #endif // X86
 669 
 670   static LIR_Opr virtual_register(int index, BasicType type) {
 671     if (index > LIR_Opr::vreg_max) {
 672       // Running out of virtual registers. Caller should bailout.
 673       return illegalOpr;
 674     }
 675 
 676     LIR_Opr res;
 677     switch (type) {
 678       case T_OBJECT: // fall through
 679       case T_ARRAY:
 680         res = (LIR_Opr)(intptr_t)((index << LIR_Opr::data_shift)  |
 681                                             LIR_Opr::object_type  |
 682                                             LIR_Opr::cpu_register |
 683                                             LIR_Opr::single_size  |
 684                                             LIR_Opr::virtual_mask);
 685         break;
 686 
 687       case T_METADATA:
 688         res = (LIR_Opr)(intptr_t)((index << LIR_Opr::data_shift)  |
 689                                             LIR_Opr::metadata_type|
 690                                             LIR_Opr::cpu_register |
 691                                             LIR_Opr::single_size  |
 692                                             LIR_Opr::virtual_mask);
 693         break;
 694 
 695       case T_INT:
 696         res = (LIR_Opr)(intptr_t)((index << LIR_Opr::data_shift) |
 697                                   LIR_Opr::int_type              |
 698                                   LIR_Opr::cpu_register          |
 699                                   LIR_Opr::single_size           |
 700                                   LIR_Opr::virtual_mask);
 701         break;
 702 
 703       case T_ADDRESS:
 704         res = (LIR_Opr)(intptr_t)((index << LIR_Opr::data_shift) |
 705                                   LIR_Opr::address_type          |
 706                                   LIR_Opr::cpu_register          |
 707                                   LIR_Opr::single_size           |
 708                                   LIR_Opr::virtual_mask);
 709         break;
 710 
 711       case T_LONG:
 712         res = (LIR_Opr)(intptr_t)((index << LIR_Opr::data_shift) |
 713                                   LIR_Opr::long_type             |
 714                                   LIR_Opr::cpu_register          |
 715                                   LIR_Opr::double_size           |
 716                                   LIR_Opr::virtual_mask);
 717         break;
 718 
 719 #ifdef __SOFTFP__
 720       case T_FLOAT:
 721         res = (LIR_Opr)(intptr_t)((index << LIR_Opr::data_shift) |
 722                                   LIR_Opr::float_type  |
 723                                   LIR_Opr::cpu_register |
 724                                   LIR_Opr::single_size |
 725                                   LIR_Opr::virtual_mask);
 726         break;
 727       case T_DOUBLE:
 728         res = (LIR_Opr)(intptr_t)((index << LIR_Opr::data_shift) |
 729                                   LIR_Opr::double_type |
 730                                   LIR_Opr::cpu_register |
 731                                   LIR_Opr::double_size |
 732                                   LIR_Opr::virtual_mask);
 733         break;
 734 #else // __SOFTFP__
 735       case T_FLOAT:
 736         res = (LIR_Opr)(intptr_t)((index << LIR_Opr::data_shift) |
 737                                   LIR_Opr::float_type           |
 738                                   LIR_Opr::fpu_register         |
 739                                   LIR_Opr::single_size          |
 740                                   LIR_Opr::virtual_mask);
 741         break;
 742 
 743       case
 744         T_DOUBLE: res = (LIR_Opr)(intptr_t)((index << LIR_Opr::data_shift) |
 745                                             LIR_Opr::double_type           |
 746                                             LIR_Opr::fpu_register          |
 747                                             LIR_Opr::double_size           |
 748                                             LIR_Opr::virtual_mask);
 749         break;
 750 #endif // __SOFTFP__
 751       default:       ShouldNotReachHere(); res = illegalOpr;
 752     }
 753 
 754 #ifdef ASSERT
 755     res->validate_type();
 756     assert(res->vreg_number() == index, "conversion check");
 757     assert(index >= LIR_Opr::vreg_base, "must start at vreg_base");
 758     assert(index <= (max_jint >> LIR_Opr::data_shift), "index is too big");
 759 
 760     // old-style calculation; check if old and new method are equal
 761     LIR_Opr::OprType t = as_OprType(type);
 762 #ifdef __SOFTFP__
 763     LIR_Opr old_res = (LIR_Opr)(intptr_t)((index << LIR_Opr::data_shift) |
 764                                t |
 765                                LIR_Opr::cpu_register |
 766                                LIR_Opr::size_for(type) | LIR_Opr::virtual_mask);
 767 #else // __SOFTFP__
 768     LIR_Opr old_res = (LIR_Opr)(intptr_t)((index << LIR_Opr::data_shift) | t |
 769                                           ((type == T_FLOAT || type == T_DOUBLE) ?  LIR_Opr::fpu_register : LIR_Opr::cpu_register) |
 770                                LIR_Opr::size_for(type) | LIR_Opr::virtual_mask);
 771     assert(res == old_res, "old and new method not equal");
 772 #endif // __SOFTFP__
 773 #endif // ASSERT
 774 
 775     return res;
 776   }
 777 
 778   // 'index' is computed by FrameMap::local_stack_pos(index); do not use other parameters as
 779   // the index is platform independent; a double stack using indices 2 and 3 has always
 780   // index 2.
 781   static LIR_Opr stack(int index, BasicType type) {
 782     LIR_Opr res;
 783     switch (type) {
 784       case T_OBJECT: // fall through
 785       case T_ARRAY:
 786         res = (LIR_Opr)(intptr_t)((index << LIR_Opr::data_shift) |
 787                                   LIR_Opr::object_type           |
 788                                   LIR_Opr::stack_value           |
 789                                   LIR_Opr::single_size);
 790         break;
 791 
 792       case T_METADATA:
 793         res = (LIR_Opr)(intptr_t)((index << LIR_Opr::data_shift) |
 794                                   LIR_Opr::metadata_type         |
 795                                   LIR_Opr::stack_value           |
 796                                   LIR_Opr::single_size);
 797         break;
 798       case T_INT:
 799         res = (LIR_Opr)(intptr_t)((index << LIR_Opr::data_shift) |
 800                                   LIR_Opr::int_type              |
 801                                   LIR_Opr::stack_value           |
 802                                   LIR_Opr::single_size);
 803         break;
 804 
 805       case T_ADDRESS:
 806         res = (LIR_Opr)(intptr_t)((index << LIR_Opr::data_shift) |
 807                                   LIR_Opr::address_type          |
 808                                   LIR_Opr::stack_value           |
 809                                   LIR_Opr::single_size);
 810         break;
 811 
 812       case T_LONG:
 813         res = (LIR_Opr)(intptr_t)((index << LIR_Opr::data_shift) |
 814                                   LIR_Opr::long_type             |
 815                                   LIR_Opr::stack_value           |
 816                                   LIR_Opr::double_size);
 817         break;
 818 
 819       case T_FLOAT:
 820         res = (LIR_Opr)(intptr_t)((index << LIR_Opr::data_shift) |
 821                                   LIR_Opr::float_type            |
 822                                   LIR_Opr::stack_value           |
 823                                   LIR_Opr::single_size);
 824         break;
 825       case T_DOUBLE:
 826         res = (LIR_Opr)(intptr_t)((index << LIR_Opr::data_shift) |
 827                                   LIR_Opr::double_type           |
 828                                   LIR_Opr::stack_value           |
 829                                   LIR_Opr::double_size);
 830         break;
 831 
 832       default:       ShouldNotReachHere(); res = illegalOpr;
 833     }
 834 
 835 #ifdef ASSERT
 836     assert(index >= 0, "index must be positive");
 837     assert(index <= (max_jint >> LIR_Opr::data_shift), "index is too big");
 838 
 839     LIR_Opr old_res = (LIR_Opr)(intptr_t)((index << LIR_Opr::data_shift) |
 840                                           LIR_Opr::stack_value           |
 841                                           as_OprType(type)                   |
 842                                           LIR_Opr::size_for(type));
 843     assert(res == old_res, "old and new method not equal");
 844 #endif
 845 
 846     return res;
 847   }
 848 
 849   static LIR_Opr intConst(jint i)                { return (LIR_Opr)(new LIR_Const(i)); }
 850   static LIR_Opr longConst(jlong l)              { return (LIR_Opr)(new LIR_Const(l)); }
 851   static LIR_Opr floatConst(jfloat f)            { return (LIR_Opr)(new LIR_Const(f)); }
 852   static LIR_Opr doubleConst(jdouble d)          { return (LIR_Opr)(new LIR_Const(d)); }
 853   static LIR_Opr oopConst(jobject o)             { return (LIR_Opr)(new LIR_Const(o)); }
 854   static LIR_Opr address(LIR_Address* a)         { return (LIR_Opr)a; }
 855   static LIR_Opr intptrConst(void* p)            { return (LIR_Opr)(new LIR_Const(p)); }
 856   static LIR_Opr intptrConst(intptr_t v)         { return (LIR_Opr)(new LIR_Const((void*)v)); }
 857   static LIR_Opr illegal()                       { return (LIR_Opr)-1; }
 858   static LIR_Opr addressConst(jint i)            { return (LIR_Opr)(new LIR_Const(i, true)); }
 859   static LIR_Opr metadataConst(Metadata* m)      { return (LIR_Opr)(new LIR_Const(m)); }
 860 
 861   static LIR_Opr value_type(ValueType* type);
 862 };
 863 
 864 
 865 //-------------------------------------------------------------------------------
 866 //                   LIR Instructions
 867 //-------------------------------------------------------------------------------
 868 //
 869 // Note:
 870 //  - every instruction has a result operand
 871 //  - every instruction has an CodeEmitInfo operand (can be revisited later)
 872 //  - every instruction has a LIR_OpCode operand
 873 //  - LIR_OpN, means an instruction that has N input operands
 874 //
 875 // class hierarchy:
 876 //
 877 class  LIR_Op;
 878 class    LIR_Op0;
 879 class      LIR_OpLabel;
 880 class    LIR_Op1;
 881 class      LIR_OpBranch;
 882 class      LIR_OpConvert;
 883 class      LIR_OpAllocObj;
 884 class      LIR_OpReturn;
 885 class      LIR_OpRoundFP;
 886 class    LIR_Op2;
 887 class    LIR_OpDelay;
 888 class    LIR_Op3;
 889 class      LIR_OpAllocArray;
 890 class    LIR_Op4;
 891 class    LIR_OpCall;
 892 class      LIR_OpJavaCall;
 893 class      LIR_OpRTCall;
 894 class    LIR_OpArrayCopy;
 895 class    LIR_OpUpdateCRC32;
 896 class    LIR_OpLock;
 897 class    LIR_OpTypeCheck;
 898 class    LIR_OpCompareAndSwap;
 899 class    LIR_OpLoadKlass;
 900 class    LIR_OpProfileCall;
 901 class    LIR_OpProfileType;
 902 #ifdef ASSERT
 903 class    LIR_OpAssert;
 904 #endif
 905 
 906 // LIR operation codes
 907 enum LIR_Code {
 908     lir_none
 909   , begin_op0
 910       , lir_label
 911       , lir_nop
 912       , lir_std_entry
 913       , lir_osr_entry
 914       , lir_fpop_raw
 915       , lir_breakpoint
 916       , lir_rtcall
 917       , lir_membar
 918       , lir_membar_acquire
 919       , lir_membar_release
 920       , lir_membar_loadload
 921       , lir_membar_storestore
 922       , lir_membar_loadstore
 923       , lir_membar_storeload
 924       , lir_get_thread
 925       , lir_on_spin_wait
 926   , end_op0
 927   , begin_op1
 928       , lir_fxch
 929       , lir_fld
 930       , lir_push
 931       , lir_pop
 932       , lir_null_check
 933       , lir_return
 934       , lir_leal
 935       , lir_move
 936       , lir_convert
 937       , lir_alloc_object
 938       , lir_monaddr
 939       , lir_roundfp
 940       , lir_safepoint
 941       , lir_unwind
 942       , lir_load_klass
 943   , end_op1
 944   , begin_op2
 945       , lir_branch
 946       , lir_cond_float_branch
 947       , lir_cmp
 948       , lir_cmp_l2i
 949       , lir_ucmp_fd2i
 950       , lir_cmp_fd2i
 951       , lir_add
 952       , lir_sub
 953       , lir_mul
 954       , lir_div
 955       , lir_rem
 956       , lir_sqrt
 957       , lir_abs
 958       , lir_neg
 959       , lir_tan
 960       , lir_log10
 961       , lir_logic_and
 962       , lir_logic_or
 963       , lir_logic_xor
 964       , lir_shl
 965       , lir_shr
 966       , lir_ushr
 967       , lir_alloc_array
 968       , lir_throw
 969       , lir_xadd
 970       , lir_xchg
 971   , end_op2
 972   , begin_op3
 973       , lir_idiv
 974       , lir_irem
 975       , lir_fmad
 976       , lir_fmaf
 977   , end_op3
 978   , begin_op4
 979       , lir_cmove
 980   , end_op4
 981   , begin_opJavaCall
 982       , lir_static_call
 983       , lir_optvirtual_call
 984       , lir_icvirtual_call
 985       , lir_dynamic_call
 986   , end_opJavaCall
 987   , begin_opArrayCopy
 988       , lir_arraycopy
 989   , end_opArrayCopy
 990   , begin_opUpdateCRC32
 991       , lir_updatecrc32
 992   , end_opUpdateCRC32
 993   , begin_opLock
 994     , lir_lock
 995     , lir_unlock
 996   , end_opLock
 997   , begin_delay_slot
 998     , lir_delay_slot
 999   , end_delay_slot
1000   , begin_opTypeCheck
1001     , lir_instanceof
1002     , lir_checkcast
1003     , lir_store_check
1004   , end_opTypeCheck
1005   , begin_opCompareAndSwap
1006     , lir_cas_long
1007     , lir_cas_obj
1008     , lir_cas_int
1009   , end_opCompareAndSwap
1010   , begin_opMDOProfile
1011     , lir_profile_call
1012     , lir_profile_type
1013   , end_opMDOProfile
1014   , begin_opAssert
1015     , lir_assert
1016   , end_opAssert
1017 #ifdef INCLUDE_ZGC
1018   , begin_opZLoadBarrierTest
1019     , lir_zloadbarrier_test
1020   , end_opZLoadBarrierTest
1021 #endif
1022 };
1023 
1024 
1025 enum LIR_Condition {
1026     lir_cond_equal
1027   , lir_cond_notEqual
1028   , lir_cond_less
1029   , lir_cond_lessEqual
1030   , lir_cond_greaterEqual
1031   , lir_cond_greater
1032   , lir_cond_belowEqual
1033   , lir_cond_aboveEqual
1034   , lir_cond_always
1035   , lir_cond_unknown = -1
1036 };
1037 
1038 
1039 enum LIR_PatchCode {
1040   lir_patch_none,
1041   lir_patch_low,
1042   lir_patch_high,
1043   lir_patch_normal
1044 };
1045 
1046 
1047 enum LIR_MoveKind {
1048   lir_move_normal,
1049   lir_move_volatile,
1050   lir_move_wide,
1051   lir_move_max_flag
1052 };
1053 
1054 
1055 // --------------------------------------------------
1056 // LIR_Op
1057 // --------------------------------------------------
1058 class LIR_Op: public CompilationResourceObj {
1059  friend class LIR_OpVisitState;
1060 
1061 #ifdef ASSERT
1062  private:
1063   const char *  _file;
1064   int           _line;
1065 #endif
1066 
1067  protected:
1068   LIR_Opr       _result;
1069   unsigned short _code;
1070   unsigned short _flags;
1071   CodeEmitInfo* _info;
1072   int           _id;     // value id for register allocation
1073   int           _fpu_pop_count;
1074   Instruction*  _source; // for debugging
1075 
1076   static void print_condition(outputStream* out, LIR_Condition cond) PRODUCT_RETURN;
1077 
1078  protected:
1079   static bool is_in_range(LIR_Code test, LIR_Code start, LIR_Code end)  { return start < test && test < end; }
1080 
1081  public:
1082   LIR_Op()
1083     :
1084 #ifdef ASSERT
1085       _file(NULL)
1086     , _line(0),
1087 #endif
1088       _result(LIR_OprFact::illegalOpr)
1089     , _code(lir_none)
1090     , _flags(0)
1091     , _info(NULL)
1092     , _id(-1)
1093     , _fpu_pop_count(0)
1094     , _source(NULL) {}
1095 
1096   LIR_Op(LIR_Code code, LIR_Opr result, CodeEmitInfo* info)
1097     :
1098 #ifdef ASSERT
1099       _file(NULL)
1100     , _line(0),
1101 #endif
1102       _result(result)
1103     , _code(code)
1104     , _flags(0)
1105     , _info(info)
1106     , _id(-1)
1107     , _fpu_pop_count(0)
1108     , _source(NULL) {}
1109 
1110   CodeEmitInfo* info() const                  { return _info;   }
1111   LIR_Code code()      const                  { return (LIR_Code)_code;   }
1112   LIR_Opr result_opr() const                  { return _result; }
1113   void    set_result_opr(LIR_Opr opr)         { _result = opr;  }
1114 
1115 #ifdef ASSERT
1116   void set_file_and_line(const char * file, int line) {
1117     _file = file;
1118     _line = line;
1119   }
1120 #endif
1121 
1122   virtual const char * name() const PRODUCT_RETURN0;
1123   virtual void visit(LIR_OpVisitState* state);
1124 
1125   int id()             const                  { return _id;     }
1126   void set_id(int id)                         { _id = id; }
1127 
1128   // FPU stack simulation helpers -- only used on Intel
1129   void set_fpu_pop_count(int count)           { assert(count >= 0 && count <= 1, "currently only 0 and 1 are valid"); _fpu_pop_count = count; }
1130   int  fpu_pop_count() const                  { return _fpu_pop_count; }
1131   bool pop_fpu_stack()                        { return _fpu_pop_count > 0; }
1132 
1133   Instruction* source() const                 { return _source; }
1134   void set_source(Instruction* ins)           { _source = ins; }
1135 
1136   virtual void emit_code(LIR_Assembler* masm) = 0;
1137   virtual void print_instr(outputStream* out) const   = 0;
1138   virtual void print_on(outputStream* st) const PRODUCT_RETURN;
1139 
1140   virtual bool is_patching() { return false; }
1141   virtual LIR_OpCall* as_OpCall() { return NULL; }
1142   virtual LIR_OpJavaCall* as_OpJavaCall() { return NULL; }
1143   virtual LIR_OpLabel* as_OpLabel() { return NULL; }
1144   virtual LIR_OpDelay* as_OpDelay() { return NULL; }
1145   virtual LIR_OpLock* as_OpLock() { return NULL; }
1146   virtual LIR_OpAllocArray* as_OpAllocArray() { return NULL; }
1147   virtual LIR_OpAllocObj* as_OpAllocObj() { return NULL; }
1148   virtual LIR_OpRoundFP* as_OpRoundFP() { return NULL; }
1149   virtual LIR_OpBranch* as_OpBranch() { return NULL; }
1150   virtual LIR_OpReturn* as_OpReturn() { return NULL; }
1151   virtual LIR_OpRTCall* as_OpRTCall() { return NULL; }
1152   virtual LIR_OpConvert* as_OpConvert() { return NULL; }
1153   virtual LIR_Op0* as_Op0() { return NULL; }
1154   virtual LIR_Op1* as_Op1() { return NULL; }
1155   virtual LIR_Op2* as_Op2() { return NULL; }
1156   virtual LIR_Op3* as_Op3() { return NULL; }
1157   virtual LIR_Op4* as_Op4() { return NULL; }
1158   virtual LIR_OpArrayCopy* as_OpArrayCopy() { return NULL; }
1159   virtual LIR_OpUpdateCRC32* as_OpUpdateCRC32() { return NULL; }
1160   virtual LIR_OpTypeCheck* as_OpTypeCheck() { return NULL; }
1161   virtual LIR_OpCompareAndSwap* as_OpCompareAndSwap() { return NULL; }
1162   virtual LIR_OpLoadKlass* as_OpLoadKlass() { return NULL; }
1163   virtual LIR_OpProfileCall* as_OpProfileCall() { return NULL; }
1164   virtual LIR_OpProfileType* as_OpProfileType() { return NULL; }
1165 #ifdef ASSERT
1166   virtual LIR_OpAssert* as_OpAssert() { return NULL; }
1167 #endif
1168 
1169   virtual void verify() const {}
1170 };
1171 
1172 // for calls
1173 class LIR_OpCall: public LIR_Op {
1174  friend class LIR_OpVisitState;
1175 
1176  protected:
1177   address      _addr;
1178   LIR_OprList* _arguments;
1179  protected:
1180   LIR_OpCall(LIR_Code code, address addr, LIR_Opr result,
1181              LIR_OprList* arguments, CodeEmitInfo* info = NULL)
1182     : LIR_Op(code, result, info)
1183     , _addr(addr)
1184     , _arguments(arguments) {}
1185 
1186  public:
1187   address addr() const                           { return _addr; }
1188   const LIR_OprList* arguments() const           { return _arguments; }
1189   virtual LIR_OpCall* as_OpCall()                { return this; }
1190 };
1191 
1192 
1193 // --------------------------------------------------
1194 // LIR_OpJavaCall
1195 // --------------------------------------------------
1196 class LIR_OpJavaCall: public LIR_OpCall {
1197  friend class LIR_OpVisitState;
1198 
1199  private:
1200   ciMethod* _method;
1201   LIR_Opr   _receiver;
1202   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.
1203 
1204  public:
1205   LIR_OpJavaCall(LIR_Code code, ciMethod* method,
1206                  LIR_Opr receiver, LIR_Opr result,
1207                  address addr, LIR_OprList* arguments,
1208                  CodeEmitInfo* info)
1209   : LIR_OpCall(code, addr, result, arguments, info)
1210   , _method(method)
1211   , _receiver(receiver)
1212   , _method_handle_invoke_SP_save_opr(LIR_OprFact::illegalOpr)
1213   { assert(is_in_range(code, begin_opJavaCall, end_opJavaCall), "code check"); }
1214 
1215   LIR_OpJavaCall(LIR_Code code, ciMethod* method,
1216                  LIR_Opr receiver, LIR_Opr result, intptr_t vtable_offset,
1217                  LIR_OprList* arguments, CodeEmitInfo* info)
1218   : LIR_OpCall(code, (address)vtable_offset, result, arguments, info)
1219   , _method(method)
1220   , _receiver(receiver)
1221   , _method_handle_invoke_SP_save_opr(LIR_OprFact::illegalOpr)
1222   { assert(is_in_range(code, begin_opJavaCall, end_opJavaCall), "code check"); }
1223 
1224   LIR_Opr receiver() const                       { return _receiver; }
1225   ciMethod* method() const                       { return _method;   }
1226 
1227   // JSR 292 support.
1228   bool is_invokedynamic() const                  { return code() == lir_dynamic_call; }
1229   bool is_method_handle_invoke() const {
1230     return method()->is_compiled_lambda_form() ||   // Java-generated lambda form
1231            method()->is_method_handle_intrinsic();  // JVM-generated MH intrinsic
1232   }
1233 
1234   virtual void emit_code(LIR_Assembler* masm);
1235   virtual LIR_OpJavaCall* as_OpJavaCall() { return this; }
1236   virtual void print_instr(outputStream* out) const PRODUCT_RETURN;
1237 };
1238 
1239 // --------------------------------------------------
1240 // LIR_OpLabel
1241 // --------------------------------------------------
1242 // Location where a branch can continue
1243 class LIR_OpLabel: public LIR_Op {
1244  friend class LIR_OpVisitState;
1245 
1246  private:
1247   Label* _label;
1248  public:
1249   LIR_OpLabel(Label* lbl)
1250    : LIR_Op(lir_label, LIR_OprFact::illegalOpr, NULL)
1251    , _label(lbl)                                 {}
1252   Label* label() const                           { return _label; }
1253 
1254   virtual void emit_code(LIR_Assembler* masm);
1255   virtual LIR_OpLabel* as_OpLabel() { return this; }
1256   virtual void print_instr(outputStream* out) const PRODUCT_RETURN;
1257 };
1258 
1259 // LIR_OpArrayCopy
1260 class LIR_OpArrayCopy: public LIR_Op {
1261  friend class LIR_OpVisitState;
1262 
1263  private:
1264   ArrayCopyStub*  _stub;
1265   LIR_Opr   _src;
1266   LIR_Opr   _src_pos;
1267   LIR_Opr   _dst;
1268   LIR_Opr   _dst_pos;
1269   LIR_Opr   _length;
1270   LIR_Opr   _tmp;
1271   ciArrayKlass* _expected_type;
1272   int       _flags;
1273 
1274 public:
1275   enum Flags {
1276     src_null_check         = 1 << 0,
1277     dst_null_check         = 1 << 1,
1278     src_pos_positive_check = 1 << 2,
1279     dst_pos_positive_check = 1 << 3,
1280     length_positive_check  = 1 << 4,
1281     src_range_check        = 1 << 5,
1282     dst_range_check        = 1 << 6,
1283     type_check             = 1 << 7,
1284     overlapping            = 1 << 8,
1285     unaligned              = 1 << 9,
1286     src_objarray           = 1 << 10,
1287     dst_objarray           = 1 << 11,
1288     all_flags              = (1 << 12) - 1
1289   };
1290 
1291   LIR_OpArrayCopy(LIR_Opr src, LIR_Opr src_pos, LIR_Opr dst, LIR_Opr dst_pos, LIR_Opr length, LIR_Opr tmp,
1292                   ciArrayKlass* expected_type, int flags, CodeEmitInfo* info);
1293 
1294   LIR_Opr src() const                            { return _src; }
1295   LIR_Opr src_pos() const                        { return _src_pos; }
1296   LIR_Opr dst() const                            { return _dst; }
1297   LIR_Opr dst_pos() const                        { return _dst_pos; }
1298   LIR_Opr length() const                         { return _length; }
1299   LIR_Opr tmp() const                            { return _tmp; }
1300   int flags() const                              { return _flags; }
1301   ciArrayKlass* expected_type() const            { return _expected_type; }
1302   ArrayCopyStub* stub() const                    { return _stub; }
1303 
1304   virtual void emit_code(LIR_Assembler* masm);
1305   virtual LIR_OpArrayCopy* as_OpArrayCopy() { return this; }
1306   void print_instr(outputStream* out) const PRODUCT_RETURN;
1307 };
1308 
1309 // LIR_OpUpdateCRC32
1310 class LIR_OpUpdateCRC32: public LIR_Op {
1311   friend class LIR_OpVisitState;
1312 
1313 private:
1314   LIR_Opr   _crc;
1315   LIR_Opr   _val;
1316 
1317 public:
1318 
1319   LIR_OpUpdateCRC32(LIR_Opr crc, LIR_Opr val, LIR_Opr res);
1320 
1321   LIR_Opr crc() const                            { return _crc; }
1322   LIR_Opr val() const                            { return _val; }
1323 
1324   virtual void emit_code(LIR_Assembler* masm);
1325   virtual LIR_OpUpdateCRC32* as_OpUpdateCRC32()  { return this; }
1326   void print_instr(outputStream* out) const PRODUCT_RETURN;
1327 };
1328 
1329 // --------------------------------------------------
1330 // LIR_Op0
1331 // --------------------------------------------------
1332 class LIR_Op0: public LIR_Op {
1333  friend class LIR_OpVisitState;
1334 
1335  public:
1336   LIR_Op0(LIR_Code code)
1337    : LIR_Op(code, LIR_OprFact::illegalOpr, NULL)  { assert(is_in_range(code, begin_op0, end_op0), "code check"); }
1338   LIR_Op0(LIR_Code code, LIR_Opr result, CodeEmitInfo* info = NULL)
1339    : LIR_Op(code, result, info)  { assert(is_in_range(code, begin_op0, end_op0), "code check"); }
1340 
1341   virtual void emit_code(LIR_Assembler* masm);
1342   virtual LIR_Op0* as_Op0() { return this; }
1343   virtual void print_instr(outputStream* out) const PRODUCT_RETURN;
1344 };
1345 
1346 
1347 // --------------------------------------------------
1348 // LIR_Op1
1349 // --------------------------------------------------
1350 
1351 class LIR_Op1: public LIR_Op {
1352  friend class LIR_OpVisitState;
1353 
1354  protected:
1355   LIR_Opr         _opr;   // input operand
1356   BasicType       _type;  // Operand types
1357   LIR_PatchCode   _patch; // only required with patchin (NEEDS_CLEANUP: do we want a special instruction for patching?)
1358 
1359   static void print_patch_code(outputStream* out, LIR_PatchCode code);
1360 
1361   void set_kind(LIR_MoveKind kind) {
1362     assert(code() == lir_move, "must be");
1363     _flags = kind;
1364   }
1365 
1366  public:
1367   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)
1368     : LIR_Op(code, result, info)
1369     , _opr(opr)
1370     , _type(type)
1371     , _patch(patch)                    { assert(is_in_range(code, begin_op1, end_op1), "code check"); }
1372 
1373   LIR_Op1(LIR_Code code, LIR_Opr opr, LIR_Opr result, BasicType type, LIR_PatchCode patch, CodeEmitInfo* info, LIR_MoveKind kind)
1374     : LIR_Op(code, result, info)
1375     , _opr(opr)
1376     , _type(type)
1377     , _patch(patch)                    {
1378     assert(code == lir_move, "must be");
1379     set_kind(kind);
1380   }
1381 
1382   LIR_Op1(LIR_Code code, LIR_Opr opr, CodeEmitInfo* info)
1383     : LIR_Op(code, LIR_OprFact::illegalOpr, info)
1384     , _opr(opr)
1385     , _type(T_ILLEGAL)
1386     , _patch(lir_patch_none)           { assert(is_in_range(code, begin_op1, end_op1), "code check"); }
1387 
1388   LIR_Opr in_opr()           const               { return _opr;   }
1389   LIR_PatchCode patch_code() const               { return _patch; }
1390   BasicType type()           const               { return _type;  }
1391 
1392   LIR_MoveKind move_kind() const {
1393     assert(code() == lir_move, "must be");
1394     return (LIR_MoveKind)_flags;
1395   }
1396 
1397   virtual bool is_patching() { return _patch != lir_patch_none; }
1398   virtual void emit_code(LIR_Assembler* masm);
1399   virtual LIR_Op1* as_Op1() { return this; }
1400   virtual const char * name() const PRODUCT_RETURN0;
1401 
1402   void set_in_opr(LIR_Opr opr) { _opr = opr; }
1403 
1404   virtual void print_instr(outputStream* out) const PRODUCT_RETURN;
1405   virtual void verify() const;
1406 };
1407 
1408 
1409 // for runtime calls
1410 class LIR_OpRTCall: public LIR_OpCall {
1411  friend class LIR_OpVisitState;
1412 
1413  private:
1414   LIR_Opr _tmp;
1415  public:
1416   LIR_OpRTCall(address addr, LIR_Opr tmp,
1417                LIR_Opr result, LIR_OprList* arguments, CodeEmitInfo* info = NULL)
1418     : LIR_OpCall(lir_rtcall, addr, result, arguments, info)
1419     , _tmp(tmp) {}
1420 
1421   virtual void print_instr(outputStream* out) const PRODUCT_RETURN;
1422   virtual void emit_code(LIR_Assembler* masm);
1423   virtual LIR_OpRTCall* as_OpRTCall() { return this; }
1424 
1425   LIR_Opr tmp() const                            { return _tmp; }
1426 
1427   virtual void verify() const;
1428 };
1429 
1430 
1431 
1432 class LIR_OpReturn: public LIR_Op1 {
1433  friend class LIR_OpVisitState;
1434 
1435  private:
1436   C1SafepointPollStub* _stub;
1437 
1438  public:
1439   LIR_OpReturn(LIR_Opr opr);
1440 
1441   C1SafepointPollStub* stub() const { return _stub; }
1442   virtual LIR_OpReturn* as_OpReturn() { return this; }
1443 };
1444 
1445 class ConversionStub;
1446 
1447 class LIR_OpConvert: public LIR_Op1 {
1448  friend class LIR_OpVisitState;
1449 
1450  private:
1451    Bytecodes::Code _bytecode;
1452    ConversionStub* _stub;
1453 
1454  public:
1455    LIR_OpConvert(Bytecodes::Code code, LIR_Opr opr, LIR_Opr result, ConversionStub* stub)
1456      : LIR_Op1(lir_convert, opr, result)
1457      , _bytecode(code)
1458      , _stub(stub)                               {}
1459 
1460   Bytecodes::Code bytecode() const               { return _bytecode; }
1461   ConversionStub* stub() const                   { return _stub; }
1462 
1463   virtual void emit_code(LIR_Assembler* masm);
1464   virtual LIR_OpConvert* as_OpConvert() { return this; }
1465   virtual void print_instr(outputStream* out) const PRODUCT_RETURN;
1466 
1467   static void print_bytecode(outputStream* out, Bytecodes::Code code) PRODUCT_RETURN;
1468 };
1469 
1470 
1471 // LIR_OpAllocObj
1472 class LIR_OpAllocObj : public LIR_Op1 {
1473  friend class LIR_OpVisitState;
1474 
1475  private:
1476   LIR_Opr _tmp1;
1477   LIR_Opr _tmp2;
1478   LIR_Opr _tmp3;
1479   LIR_Opr _tmp4;
1480   int     _hdr_size;
1481   int     _obj_size;
1482   CodeStub* _stub;
1483   bool    _init_check;
1484 
1485  public:
1486   LIR_OpAllocObj(LIR_Opr klass, LIR_Opr result,
1487                  LIR_Opr t1, LIR_Opr t2, LIR_Opr t3, LIR_Opr t4,
1488                  int hdr_size, int obj_size, bool init_check, CodeStub* stub)
1489     : LIR_Op1(lir_alloc_object, klass, result)
1490     , _tmp1(t1)
1491     , _tmp2(t2)
1492     , _tmp3(t3)
1493     , _tmp4(t4)
1494     , _hdr_size(hdr_size)
1495     , _obj_size(obj_size)
1496     , _stub(stub)
1497     , _init_check(init_check)                    { }
1498 
1499   LIR_Opr klass()        const                   { return in_opr();     }
1500   LIR_Opr obj()          const                   { return result_opr(); }
1501   LIR_Opr tmp1()         const                   { return _tmp1;        }
1502   LIR_Opr tmp2()         const                   { return _tmp2;        }
1503   LIR_Opr tmp3()         const                   { return _tmp3;        }
1504   LIR_Opr tmp4()         const                   { return _tmp4;        }
1505   int     header_size()  const                   { return _hdr_size;    }
1506   int     object_size()  const                   { return _obj_size;    }
1507   bool    init_check()   const                   { return _init_check;  }
1508   CodeStub* stub()       const                   { return _stub;        }
1509 
1510   virtual void emit_code(LIR_Assembler* masm);
1511   virtual LIR_OpAllocObj * as_OpAllocObj () { return this; }
1512   virtual void print_instr(outputStream* out) const PRODUCT_RETURN;
1513 };
1514 
1515 
1516 // LIR_OpRoundFP
1517 class LIR_OpRoundFP : public LIR_Op1 {
1518  friend class LIR_OpVisitState;
1519 
1520  private:
1521   LIR_Opr _tmp;
1522 
1523  public:
1524   LIR_OpRoundFP(LIR_Opr reg, LIR_Opr stack_loc_temp, LIR_Opr result)
1525     : LIR_Op1(lir_roundfp, reg, result)
1526     , _tmp(stack_loc_temp) {}
1527 
1528   LIR_Opr tmp() const                            { return _tmp; }
1529   virtual LIR_OpRoundFP* as_OpRoundFP()          { return this; }
1530   void print_instr(outputStream* out) const PRODUCT_RETURN;
1531 };
1532 
1533 // LIR_OpTypeCheck
1534 class LIR_OpTypeCheck: public LIR_Op {
1535  friend class LIR_OpVisitState;
1536 
1537  private:
1538   LIR_Opr       _object;
1539   LIR_Opr       _array;
1540   ciKlass*      _klass;
1541   LIR_Opr       _tmp1;
1542   LIR_Opr       _tmp2;
1543   LIR_Opr       _tmp3;
1544   bool          _fast_check;
1545   CodeEmitInfo* _info_for_patch;
1546   CodeEmitInfo* _info_for_exception;
1547   CodeStub*     _stub;
1548   ciMethod*     _profiled_method;
1549   int           _profiled_bci;
1550   bool          _should_profile;
1551 
1552 public:
1553   LIR_OpTypeCheck(LIR_Code code, LIR_Opr result, LIR_Opr object, ciKlass* klass,
1554                   LIR_Opr tmp1, LIR_Opr tmp2, LIR_Opr tmp3, bool fast_check,
1555                   CodeEmitInfo* info_for_exception, CodeEmitInfo* info_for_patch, CodeStub* stub);
1556   LIR_OpTypeCheck(LIR_Code code, LIR_Opr object, LIR_Opr array,
1557                   LIR_Opr tmp1, LIR_Opr tmp2, LIR_Opr tmp3, CodeEmitInfo* info_for_exception);
1558 
1559   LIR_Opr object() const                         { return _object;         }
1560   LIR_Opr array() const                          { assert(code() == lir_store_check, "not valid"); return _array;         }
1561   LIR_Opr tmp1() const                           { return _tmp1;           }
1562   LIR_Opr tmp2() const                           { return _tmp2;           }
1563   LIR_Opr tmp3() const                           { return _tmp3;           }
1564   ciKlass* klass() const                         { assert(code() == lir_instanceof || code() == lir_checkcast, "not valid"); return _klass;          }
1565   bool fast_check() const                        { assert(code() == lir_instanceof || code() == lir_checkcast, "not valid"); return _fast_check;     }
1566   CodeEmitInfo* info_for_patch() const           { return _info_for_patch;  }
1567   CodeEmitInfo* info_for_exception() const       { return _info_for_exception; }
1568   CodeStub* stub() const                         { return _stub;           }
1569 
1570   // MethodData* profiling
1571   void set_profiled_method(ciMethod *method)     { _profiled_method = method; }
1572   void set_profiled_bci(int bci)                 { _profiled_bci = bci;       }
1573   void set_should_profile(bool b)                { _should_profile = b;       }
1574   ciMethod* profiled_method() const              { return _profiled_method;   }
1575   int       profiled_bci() const                 { return _profiled_bci;      }
1576   bool      should_profile() const               { return _should_profile;    }
1577 
1578   virtual bool is_patching() { return _info_for_patch != NULL; }
1579   virtual void emit_code(LIR_Assembler* masm);
1580   virtual LIR_OpTypeCheck* as_OpTypeCheck() { return this; }
1581   void print_instr(outputStream* out) const PRODUCT_RETURN;
1582 };
1583 
1584 // LIR_Op2
1585 class LIR_Op2: public LIR_Op {
1586  friend class LIR_OpVisitState;
1587 
1588   int  _fpu_stack_size; // for sin/cos implementation on Intel
1589 
1590  protected:
1591   LIR_Opr   _opr1;
1592   LIR_Opr   _opr2;
1593   BasicType _type;
1594   LIR_Opr   _tmp1;
1595   LIR_Opr   _tmp2;
1596   LIR_Opr   _tmp3;
1597   LIR_Opr   _tmp4;
1598   LIR_Opr   _tmp5;
1599   LIR_Condition _condition;
1600 
1601   void verify() const;
1602 
1603  public:
1604   LIR_Op2(LIR_Code code, LIR_Condition condition, LIR_Opr opr1, LIR_Opr opr2, CodeEmitInfo* info = NULL, BasicType type = T_ILLEGAL)
1605     : LIR_Op(code, LIR_OprFact::illegalOpr, info)
1606     , _fpu_stack_size(0)
1607     , _opr1(opr1)
1608     , _opr2(opr2)
1609     , _type(type)
1610     , _tmp1(LIR_OprFact::illegalOpr)
1611     , _tmp2(LIR_OprFact::illegalOpr)
1612     , _tmp3(LIR_OprFact::illegalOpr)
1613     , _tmp4(LIR_OprFact::illegalOpr)
1614     , _tmp5(LIR_OprFact::illegalOpr)
1615     , _condition(condition) {
1616     assert(code == lir_cmp || code == lir_branch || code == lir_cond_float_branch || code == lir_assert, "code check");
1617   }
1618 
1619   LIR_Op2(LIR_Code code, LIR_Condition condition, LIR_Opr opr1, LIR_Opr opr2, LIR_Opr result, BasicType type)
1620     : LIR_Op(code, result, NULL)
1621     , _fpu_stack_size(0)
1622     , _opr1(opr1)
1623     , _opr2(opr2)
1624     , _type(type)
1625     , _tmp1(LIR_OprFact::illegalOpr)
1626     , _tmp2(LIR_OprFact::illegalOpr)
1627     , _tmp3(LIR_OprFact::illegalOpr)
1628     , _tmp4(LIR_OprFact::illegalOpr)
1629     , _tmp5(LIR_OprFact::illegalOpr)
1630     , _condition(condition) {
1631     assert(code == lir_cmove, "code check");
1632     assert(type != T_ILLEGAL, "cmove should have type");
1633   }
1634 
1635   LIR_Op2(LIR_Code code, LIR_Opr opr1, LIR_Opr opr2, LIR_Opr result = LIR_OprFact::illegalOpr,
1636           CodeEmitInfo* info = NULL, BasicType type = T_ILLEGAL)
1637     : LIR_Op(code, result, info)
1638     , _fpu_stack_size(0)
1639     , _opr1(opr1)
1640     , _opr2(opr2)
1641     , _type(type)
1642     , _tmp1(LIR_OprFact::illegalOpr)
1643     , _tmp2(LIR_OprFact::illegalOpr)
1644     , _tmp3(LIR_OprFact::illegalOpr)
1645     , _tmp4(LIR_OprFact::illegalOpr)
1646     , _tmp5(LIR_OprFact::illegalOpr)
1647     , _condition(lir_cond_unknown) {
1648     assert(code != lir_cmp && code != lir_branch && code != lir_cond_float_branch && is_in_range(code, begin_op2, end_op2), "code check");
1649   }
1650 
1651   LIR_Op2(LIR_Code code, LIR_Opr opr1, LIR_Opr opr2, LIR_Opr result, LIR_Opr tmp1, LIR_Opr tmp2 = LIR_OprFact::illegalOpr,
1652           LIR_Opr tmp3 = LIR_OprFact::illegalOpr, LIR_Opr tmp4 = LIR_OprFact::illegalOpr, LIR_Opr tmp5 = LIR_OprFact::illegalOpr)
1653     : LIR_Op(code, result, NULL)
1654     , _fpu_stack_size(0)
1655     , _opr1(opr1)
1656     , _opr2(opr2)
1657     , _type(T_ILLEGAL)
1658     , _tmp1(tmp1)
1659     , _tmp2(tmp2)
1660     , _tmp3(tmp3)
1661     , _tmp4(tmp4)
1662     , _tmp5(tmp5)
1663     , _condition(lir_cond_unknown) {
1664     assert(code != lir_cmp && code != lir_branch && code != lir_cond_float_branch && is_in_range(code, begin_op2, end_op2), "code check");
1665   }
1666 
1667   LIR_Opr in_opr1() const                        { return _opr1; }
1668   LIR_Opr in_opr2() const                        { return _opr2; }
1669   BasicType type()  const                        { return _type; }
1670   LIR_Opr tmp1_opr() const                       { return _tmp1; }
1671   LIR_Opr tmp2_opr() const                       { return _tmp2; }
1672   LIR_Opr tmp3_opr() const                       { return _tmp3; }
1673   LIR_Opr tmp4_opr() const                       { return _tmp4; }
1674   LIR_Opr tmp5_opr() const                       { return _tmp5; }
1675   LIR_Condition condition() const  {
1676     assert(code() == lir_cmp || code() == lir_branch || code() == lir_cond_float_branch || code() == lir_assert, "only valid for branch and assert"); return _condition;
1677   }
1678   void set_condition(LIR_Condition condition) {
1679     assert(code() == lir_cmp || code() == lir_branch || code() == lir_cond_float_branch, "only valid for branch"); _condition = condition;
1680   }
1681 
1682   void set_fpu_stack_size(int size)              { _fpu_stack_size = size; }
1683   int  fpu_stack_size() const                    { return _fpu_stack_size; }
1684 
1685   void set_in_opr1(LIR_Opr opr)                  { _opr1 = opr; }
1686   void set_in_opr2(LIR_Opr opr)                  { _opr2 = opr; }
1687 
1688   virtual void emit_code(LIR_Assembler* masm);
1689   virtual LIR_Op2* as_Op2() { return this; }
1690   virtual void print_instr(outputStream* out) const PRODUCT_RETURN;
1691 };
1692 
1693 class LIR_OpBranch: public LIR_Op2 {
1694  friend class LIR_OpVisitState;
1695 
1696  private:
1697   Label*        _label;
1698   BlockBegin*   _block;  // if this is a branch to a block, this is the block
1699   BlockBegin*   _ublock; // if this is a float-branch, this is the unordered block
1700   CodeStub*     _stub;   // if this is a branch to a stub, this is the stub
1701 
1702  public:
1703   LIR_OpBranch(LIR_Condition cond, Label* lbl)
1704     : LIR_Op2(lir_branch, cond, LIR_OprFact::illegalOpr, LIR_OprFact::illegalOpr, (CodeEmitInfo*) NULL)
1705     , _label(lbl)
1706     , _block(NULL)
1707     , _ublock(NULL)
1708     , _stub(NULL) { }
1709 
1710   LIR_OpBranch(LIR_Condition cond, BlockBegin* block);
1711   LIR_OpBranch(LIR_Condition cond, CodeStub* stub);
1712 
1713   // for unordered comparisons
1714   LIR_OpBranch(LIR_Condition cond, BlockBegin* block, BlockBegin* ublock);
1715 
1716   LIR_Condition cond() const {
1717     return condition();
1718   }
1719 
1720   void set_cond(LIR_Condition cond) {
1721     set_condition(cond);
1722   }
1723 
1724   Label*        label()       const              { return _label;       }
1725   BlockBegin*   block()       const              { return _block;       }
1726   BlockBegin*   ublock()      const              { return _ublock;      }
1727   CodeStub*     stub()        const              { return _stub;        }
1728 
1729   void          change_block(BlockBegin* b);
1730   void          change_ublock(BlockBegin* b);
1731   void          negate_cond();
1732 
1733   virtual void emit_code(LIR_Assembler* masm);
1734   virtual LIR_OpBranch* as_OpBranch() { return this; }
1735   virtual void print_instr(outputStream* out) const PRODUCT_RETURN;
1736 };
1737 
1738 class LIR_OpAllocArray : public LIR_Op {
1739  friend class LIR_OpVisitState;
1740 
1741  private:
1742   LIR_Opr   _klass;
1743   LIR_Opr   _len;
1744   LIR_Opr   _tmp1;
1745   LIR_Opr   _tmp2;
1746   LIR_Opr   _tmp3;
1747   LIR_Opr   _tmp4;
1748   BasicType _type;
1749   CodeStub* _stub;
1750 
1751  public:
1752   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)
1753     : LIR_Op(lir_alloc_array, result, NULL)
1754     , _klass(klass)
1755     , _len(len)
1756     , _tmp1(t1)
1757     , _tmp2(t2)
1758     , _tmp3(t3)
1759     , _tmp4(t4)
1760     , _type(type)
1761     , _stub(stub) {}
1762 
1763   LIR_Opr   klass()   const                      { return _klass;       }
1764   LIR_Opr   len()     const                      { return _len;         }
1765   LIR_Opr   obj()     const                      { return result_opr(); }
1766   LIR_Opr   tmp1()    const                      { return _tmp1;        }
1767   LIR_Opr   tmp2()    const                      { return _tmp2;        }
1768   LIR_Opr   tmp3()    const                      { return _tmp3;        }
1769   LIR_Opr   tmp4()    const                      { return _tmp4;        }
1770   BasicType type()    const                      { return _type;        }
1771   CodeStub* stub()    const                      { return _stub;        }
1772 
1773   virtual void emit_code(LIR_Assembler* masm);
1774   virtual LIR_OpAllocArray * as_OpAllocArray () { return this; }
1775   virtual void print_instr(outputStream* out) const PRODUCT_RETURN;
1776 };
1777 
1778 
1779 class LIR_Op3: public LIR_Op {
1780  friend class LIR_OpVisitState;
1781 
1782  private:
1783   LIR_Opr _opr1;
1784   LIR_Opr _opr2;
1785   LIR_Opr _opr3;
1786  public:
1787   LIR_Op3(LIR_Code code, LIR_Opr opr1, LIR_Opr opr2, LIR_Opr opr3, LIR_Opr result, CodeEmitInfo* info = NULL)
1788     : LIR_Op(code, result, info)
1789     , _opr1(opr1)
1790     , _opr2(opr2)
1791     , _opr3(opr3)                                { assert(is_in_range(code, begin_op3, end_op3), "code check"); }
1792   LIR_Opr in_opr1() const                        { return _opr1; }
1793   LIR_Opr in_opr2() const                        { return _opr2; }
1794   LIR_Opr in_opr3() const                        { return _opr3; }
1795 
1796   virtual void emit_code(LIR_Assembler* masm);
1797   virtual LIR_Op3* as_Op3() { return this; }
1798   virtual void print_instr(outputStream* out) const PRODUCT_RETURN;
1799 };
1800 
1801 class LIR_Op4: public LIR_Op {
1802   friend class LIR_OpVisitState;
1803  protected:
1804   LIR_Opr   _opr1;
1805   LIR_Opr   _opr2;
1806   LIR_Opr   _opr3;
1807   LIR_Opr   _opr4;
1808   BasicType _type;
1809   LIR_Opr   _tmp1;
1810   LIR_Opr   _tmp2;
1811   LIR_Opr   _tmp3;
1812   LIR_Opr   _tmp4;
1813   LIR_Opr   _tmp5;
1814   LIR_Condition _condition;
1815 
1816  public:
1817   LIR_Op4(LIR_Code code, LIR_Condition condition, LIR_Opr opr1, LIR_Opr opr2, LIR_Opr opr3, LIR_Opr opr4,
1818           LIR_Opr result, BasicType type)
1819     : LIR_Op(code, result, NULL)
1820     , _opr1(opr1)
1821     , _opr2(opr2)
1822     , _opr3(opr3)
1823     , _opr4(opr4)
1824     , _type(type)
1825     , _tmp1(LIR_OprFact::illegalOpr)
1826     , _tmp2(LIR_OprFact::illegalOpr)
1827     , _tmp3(LIR_OprFact::illegalOpr)
1828     , _tmp4(LIR_OprFact::illegalOpr)
1829     , _tmp5(LIR_OprFact::illegalOpr)
1830     , _condition(condition) {
1831     assert(code == lir_cmove, "code check");
1832     assert(type != T_ILLEGAL, "cmove should have type");
1833   }
1834 
1835   LIR_Opr in_opr1() const                        { return _opr1; }
1836   LIR_Opr in_opr2() const                        { return _opr2; }
1837   LIR_Opr in_opr3() const                        { return _opr3; }
1838   LIR_Opr in_opr4() const                        { return _opr4; }
1839   BasicType type()  const                        { return _type; }
1840   LIR_Opr tmp1_opr() const                       { return _tmp1; }
1841   LIR_Opr tmp2_opr() const                       { return _tmp2; }
1842   LIR_Opr tmp3_opr() const                       { return _tmp3; }
1843   LIR_Opr tmp4_opr() const                       { return _tmp4; }
1844   LIR_Opr tmp5_opr() const                       { return _tmp5; }
1845 
1846   LIR_Condition condition() const                { return _condition; }
1847   void set_condition(LIR_Condition condition)    { _condition = condition; }
1848 
1849   void set_in_opr1(LIR_Opr opr)                  { _opr1 = opr; }
1850   void set_in_opr2(LIR_Opr opr)                  { _opr2 = opr; }
1851   void set_in_opr3(LIR_Opr opr)                  { _opr3 = opr; }
1852   void set_in_opr4(LIR_Opr opr)                  { _opr4 = opr; }
1853   virtual void emit_code(LIR_Assembler* masm);
1854   virtual LIR_Op4* as_Op4() { return this; }
1855 
1856   virtual void print_instr(outputStream* out) const PRODUCT_RETURN;
1857 };
1858 
1859 //--------------------------------
1860 class LabelObj: public CompilationResourceObj {
1861  private:
1862   Label _label;
1863  public:
1864   LabelObj()                                     {}
1865   Label* label()                                 { return &_label; }
1866 };
1867 
1868 
1869 class LIR_OpLock: public LIR_Op {
1870  friend class LIR_OpVisitState;
1871 
1872  private:
1873   LIR_Opr _hdr;
1874   LIR_Opr _obj;
1875   LIR_Opr _lock;
1876   LIR_Opr _scratch;
1877   CodeStub* _stub;
1878  public:
1879   LIR_OpLock(LIR_Code code, LIR_Opr hdr, LIR_Opr obj, LIR_Opr lock, LIR_Opr scratch, CodeStub* stub, CodeEmitInfo* info)
1880     : LIR_Op(code, LIR_OprFact::illegalOpr, info)
1881     , _hdr(hdr)
1882     , _obj(obj)
1883     , _lock(lock)
1884     , _scratch(scratch)
1885     , _stub(stub)                      {}
1886 
1887   LIR_Opr hdr_opr() const                        { return _hdr; }
1888   LIR_Opr obj_opr() const                        { return _obj; }
1889   LIR_Opr lock_opr() const                       { return _lock; }
1890   LIR_Opr scratch_opr() const                    { return _scratch; }
1891   CodeStub* stub() const                         { return _stub; }
1892 
1893   virtual void emit_code(LIR_Assembler* masm);
1894   virtual LIR_OpLock* as_OpLock() { return this; }
1895   void print_instr(outputStream* out) const PRODUCT_RETURN;
1896 };
1897 
1898 class LIR_OpLoadKlass: public LIR_Op {
1899   friend class LIR_OpVisitState;
1900 
1901  private:
1902   LIR_Opr _obj;
1903   CodeStub* _stub;
1904  public:
1905   LIR_OpLoadKlass(LIR_Opr obj, LIR_Opr result, CodeEmitInfo* info, CodeStub* stub)
1906     : LIR_Op(lir_load_klass, result, info)
1907     , _obj(obj)
1908     , _stub(stub) {}
1909 
1910   LIR_Opr obj()        const { return _obj;  }
1911   CodeStub* stub()     const { return _stub; }
1912 
1913   virtual LIR_OpLoadKlass* as_OpLoadKlass() { return this; }
1914   virtual void emit_code(LIR_Assembler* masm);
1915   void print_instr(outputStream* out) const PRODUCT_RETURN;
1916 };
1917 
1918 class LIR_OpDelay: public LIR_Op {
1919  friend class LIR_OpVisitState;
1920 
1921  private:
1922   LIR_Op* _op;
1923 
1924  public:
1925   LIR_OpDelay(LIR_Op* op, CodeEmitInfo* info):
1926     LIR_Op(lir_delay_slot, LIR_OprFact::illegalOpr, info),
1927     _op(op) {
1928     assert(op->code() == lir_nop, "should be filling with nops");
1929   }
1930   virtual void emit_code(LIR_Assembler* masm);
1931   virtual LIR_OpDelay* as_OpDelay() { return this; }
1932   void print_instr(outputStream* out) const PRODUCT_RETURN;
1933   LIR_Op* delay_op() const { return _op; }
1934   CodeEmitInfo* call_info() const { return info(); }
1935 };
1936 
1937 #ifdef ASSERT
1938 // LIR_OpAssert
1939 class LIR_OpAssert : public LIR_Op2 {
1940  friend class LIR_OpVisitState;
1941 
1942  private:
1943   const char* _msg;
1944   bool        _halt;
1945 
1946  public:
1947   LIR_OpAssert(LIR_Condition condition, LIR_Opr opr1, LIR_Opr opr2, const char* msg, bool halt)
1948     : LIR_Op2(lir_assert, condition, opr1, opr2)
1949     , _msg(msg)
1950     , _halt(halt) {
1951   }
1952 
1953   const char* msg() const                        { return _msg; }
1954   bool        halt() const                       { return _halt; }
1955 
1956   virtual void emit_code(LIR_Assembler* masm);
1957   virtual LIR_OpAssert* as_OpAssert()            { return this; }
1958   virtual void print_instr(outputStream* out) const PRODUCT_RETURN;
1959 };
1960 #endif
1961 
1962 // LIR_OpCompareAndSwap
1963 class LIR_OpCompareAndSwap : public LIR_Op {
1964  friend class LIR_OpVisitState;
1965 
1966  private:
1967   LIR_Opr _addr;
1968   LIR_Opr _cmp_value;
1969   LIR_Opr _new_value;
1970   LIR_Opr _tmp1;
1971   LIR_Opr _tmp2;
1972 
1973  public:
1974   LIR_OpCompareAndSwap(LIR_Code code, LIR_Opr addr, LIR_Opr cmp_value, LIR_Opr new_value,
1975                        LIR_Opr t1, LIR_Opr t2, LIR_Opr result)
1976     : LIR_Op(code, result, NULL)  // no result, no info
1977     , _addr(addr)
1978     , _cmp_value(cmp_value)
1979     , _new_value(new_value)
1980     , _tmp1(t1)
1981     , _tmp2(t2)                                  { }
1982 
1983   LIR_Opr addr()        const                    { return _addr;  }
1984   LIR_Opr cmp_value()   const                    { return _cmp_value; }
1985   LIR_Opr new_value()   const                    { return _new_value; }
1986   LIR_Opr tmp1()        const                    { return _tmp1;      }
1987   LIR_Opr tmp2()        const                    { return _tmp2;      }
1988 
1989   virtual void emit_code(LIR_Assembler* masm);
1990   virtual LIR_OpCompareAndSwap * as_OpCompareAndSwap () { return this; }
1991   virtual void print_instr(outputStream* out) const PRODUCT_RETURN;
1992 };
1993 
1994 // LIR_OpProfileCall
1995 class LIR_OpProfileCall : public LIR_Op {
1996  friend class LIR_OpVisitState;
1997 
1998  private:
1999   ciMethod* _profiled_method;
2000   int       _profiled_bci;
2001   ciMethod* _profiled_callee;
2002   LIR_Opr   _mdo;
2003   LIR_Opr   _recv;
2004   LIR_Opr   _tmp1;
2005   ciKlass*  _known_holder;
2006 
2007  public:
2008   // Destroys recv
2009   LIR_OpProfileCall(ciMethod* profiled_method, int profiled_bci, ciMethod* profiled_callee, LIR_Opr mdo, LIR_Opr recv, LIR_Opr t1, ciKlass* known_holder)
2010     : LIR_Op(lir_profile_call, LIR_OprFact::illegalOpr, NULL)  // no result, no info
2011     , _profiled_method(profiled_method)
2012     , _profiled_bci(profiled_bci)
2013     , _profiled_callee(profiled_callee)
2014     , _mdo(mdo)
2015     , _recv(recv)
2016     , _tmp1(t1)
2017     , _known_holder(known_holder)                { }
2018 
2019   ciMethod* profiled_method() const              { return _profiled_method;  }
2020   int       profiled_bci()    const              { return _profiled_bci;     }
2021   ciMethod* profiled_callee() const              { return _profiled_callee;  }
2022   LIR_Opr   mdo()             const              { return _mdo;              }
2023   LIR_Opr   recv()            const              { return _recv;             }
2024   LIR_Opr   tmp1()            const              { return _tmp1;             }
2025   ciKlass*  known_holder()    const              { return _known_holder;     }
2026 
2027   virtual void emit_code(LIR_Assembler* masm);
2028   virtual LIR_OpProfileCall* as_OpProfileCall() { return this; }
2029   virtual void print_instr(outputStream* out) const PRODUCT_RETURN;
2030   bool should_profile_receiver_type() const {
2031     bool callee_is_static = _profiled_callee->is_loaded() && _profiled_callee->is_static();
2032     Bytecodes::Code bc = _profiled_method->java_code_at_bci(_profiled_bci);
2033     bool call_is_virtual = (bc == Bytecodes::_invokevirtual && !_profiled_callee->can_be_statically_bound()) || bc == Bytecodes::_invokeinterface;
2034     return C1ProfileVirtualCalls && call_is_virtual && !callee_is_static;
2035   }
2036 };
2037 
2038 // LIR_OpProfileType
2039 class LIR_OpProfileType : public LIR_Op {
2040  friend class LIR_OpVisitState;
2041 
2042  private:
2043   LIR_Opr      _mdp;
2044   LIR_Opr      _obj;
2045   LIR_Opr      _tmp;
2046   ciKlass*     _exact_klass;   // non NULL if we know the klass statically (no need to load it from _obj)
2047   intptr_t     _current_klass; // what the profiling currently reports
2048   bool         _not_null;      // true if we know statically that _obj cannot be null
2049   bool         _no_conflict;   // true if we're profling parameters, _exact_klass is not NULL and we know
2050                                // _exact_klass it the only possible type for this parameter in any context.
2051 
2052  public:
2053   // Destroys recv
2054   LIR_OpProfileType(LIR_Opr mdp, LIR_Opr obj, ciKlass* exact_klass, intptr_t current_klass, LIR_Opr tmp, bool not_null, bool no_conflict)
2055     : LIR_Op(lir_profile_type, LIR_OprFact::illegalOpr, NULL)  // no result, no info
2056     , _mdp(mdp)
2057     , _obj(obj)
2058     , _tmp(tmp)
2059     , _exact_klass(exact_klass)
2060     , _current_klass(current_klass)
2061     , _not_null(not_null)
2062     , _no_conflict(no_conflict) { }
2063 
2064   LIR_Opr      mdp()              const             { return _mdp;              }
2065   LIR_Opr      obj()              const             { return _obj;              }
2066   LIR_Opr      tmp()              const             { return _tmp;              }
2067   ciKlass*     exact_klass()      const             { return _exact_klass;      }
2068   intptr_t     current_klass()    const             { return _current_klass;    }
2069   bool         not_null()         const             { return _not_null;         }
2070   bool         no_conflict()      const             { return _no_conflict;      }
2071 
2072   virtual void emit_code(LIR_Assembler* masm);
2073   virtual LIR_OpProfileType* as_OpProfileType() { return this; }
2074   virtual void print_instr(outputStream* out) const PRODUCT_RETURN;
2075 };
2076 
2077 class LIR_InsertionBuffer;
2078 
2079 //--------------------------------LIR_List---------------------------------------------------
2080 // Maintains a list of LIR instructions (one instance of LIR_List per basic block)
2081 // The LIR instructions are appended by the LIR_List class itself;
2082 //
2083 // Notes:
2084 // - all offsets are(should be) in bytes
2085 // - local positions are specified with an offset, with offset 0 being local 0
2086 
2087 class LIR_List: public CompilationResourceObj {
2088  private:
2089   LIR_OpList  _operations;
2090 
2091   Compilation*  _compilation;
2092 #ifndef PRODUCT
2093   BlockBegin*   _block;
2094 #endif
2095 #ifdef ASSERT
2096   const char *  _file;
2097   int           _line;
2098 #endif
2099 #ifdef RISCV
2100   LIR_Opr       _cmp_opr1;
2101   LIR_Opr       _cmp_opr2;
2102 #endif
2103 
2104  public:
2105   void append(LIR_Op* op) {
2106     if (op->source() == NULL)
2107       op->set_source(_compilation->current_instruction());
2108 #ifndef PRODUCT
2109     if (PrintIRWithLIR) {
2110       _compilation->maybe_print_current_instruction();
2111       op->print(); tty->cr();
2112     }
2113 #endif // PRODUCT
2114 
2115 #ifdef RISCV
2116     set_cmp_oprs(op);
2117     // lir_cmp set cmp oprs only on riscv
2118     if (op->code() == lir_cmp) return;
2119 #endif
2120 
2121     _operations.append(op);
2122 
2123 #ifdef ASSERT
2124     op->verify();
2125     op->set_file_and_line(_file, _line);
2126     _file = NULL;
2127     _line = 0;
2128 #endif
2129   }
2130 
2131   LIR_List(Compilation* compilation, BlockBegin* block = NULL);
2132 
2133 #ifdef ASSERT
2134   void set_file_and_line(const char * file, int line);
2135 #endif
2136 
2137 #ifdef RISCV
2138   void set_cmp_oprs(LIR_Op* op);
2139 #endif
2140 
2141   //---------- accessors ---------------
2142   LIR_OpList* instructions_list()                { return &_operations; }
2143   int         length() const                     { return _operations.length(); }
2144   LIR_Op*     at(int i) const                    { return _operations.at(i); }
2145 
2146   NOT_PRODUCT(BlockBegin* block() const          { return _block; });
2147 
2148   // insert LIR_Ops in buffer to right places in LIR_List
2149   void append(LIR_InsertionBuffer* buffer);
2150 
2151   //---------- mutators ---------------
2152   void insert_before(int i, LIR_List* op_list)   { _operations.insert_before(i, op_list->instructions_list()); }
2153   void insert_before(int i, LIR_Op* op)          { _operations.insert_before(i, op); }
2154   void remove_at(int i)                          { _operations.remove_at(i); }
2155 
2156   //---------- printing -------------
2157   void print_instructions() PRODUCT_RETURN;
2158 
2159 
2160   //---------- instructions -------------
2161   void call_opt_virtual(ciMethod* method, LIR_Opr receiver, LIR_Opr result,
2162                         address dest, LIR_OprList* arguments,
2163                         CodeEmitInfo* info) {
2164     append(new LIR_OpJavaCall(lir_optvirtual_call, method, receiver, result, dest, arguments, info));
2165   }
2166   void call_static(ciMethod* method, LIR_Opr result,
2167                    address dest, LIR_OprList* arguments, CodeEmitInfo* info) {
2168     append(new LIR_OpJavaCall(lir_static_call, method, LIR_OprFact::illegalOpr, result, dest, arguments, info));
2169   }
2170   void call_icvirtual(ciMethod* method, LIR_Opr receiver, LIR_Opr result,
2171                       address dest, LIR_OprList* arguments, CodeEmitInfo* info) {
2172     append(new LIR_OpJavaCall(lir_icvirtual_call, method, receiver, result, dest, arguments, info));
2173   }
2174   void call_dynamic(ciMethod* method, LIR_Opr receiver, LIR_Opr result,
2175                     address dest, LIR_OprList* arguments, CodeEmitInfo* info) {
2176     append(new LIR_OpJavaCall(lir_dynamic_call, method, receiver, result, dest, arguments, info));
2177   }
2178 
2179   void get_thread(LIR_Opr result)                { append(new LIR_Op0(lir_get_thread, result)); }
2180   void membar()                                  { append(new LIR_Op0(lir_membar)); }
2181   void membar_acquire()                          { append(new LIR_Op0(lir_membar_acquire)); }
2182   void membar_release()                          { append(new LIR_Op0(lir_membar_release)); }
2183   void membar_loadload()                         { append(new LIR_Op0(lir_membar_loadload)); }
2184   void membar_storestore()                       { append(new LIR_Op0(lir_membar_storestore)); }
2185   void membar_loadstore()                        { append(new LIR_Op0(lir_membar_loadstore)); }
2186   void membar_storeload()                        { append(new LIR_Op0(lir_membar_storeload)); }
2187 
2188   void nop()                                     { append(new LIR_Op0(lir_nop)); }
2189 
2190   void std_entry(LIR_Opr receiver)               { append(new LIR_Op0(lir_std_entry, receiver)); }
2191   void osr_entry(LIR_Opr osrPointer)             { append(new LIR_Op0(lir_osr_entry, osrPointer)); }
2192 
2193   void on_spin_wait()                            { append(new LIR_Op0(lir_on_spin_wait)); }
2194 
2195   void branch_destination(Label* lbl)            { append(new LIR_OpLabel(lbl)); }
2196 
2197   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)); }
2198 
2199   // result is a stack location for old backend and vreg for UseLinearScan
2200   // stack_loc_temp is an illegal register for old backend
2201   void roundfp(LIR_Opr reg, LIR_Opr stack_loc_temp, LIR_Opr result) { append(new LIR_OpRoundFP(reg, stack_loc_temp, result)); }
2202   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)); }
2203   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)); }
2204   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)); }
2205   void move_wide(LIR_Address* src, LIR_Opr dst, CodeEmitInfo* info = NULL) {
2206     if (UseCompressedOops) {
2207       append(new LIR_Op1(lir_move, LIR_OprFact::address(src), dst, src->type(), lir_patch_none, info, lir_move_wide));
2208     } else {
2209       move(src, dst, info);
2210     }
2211   }
2212   void move_wide(LIR_Opr src, LIR_Address* dst, CodeEmitInfo* info = NULL) {
2213     if (UseCompressedOops) {
2214       append(new LIR_Op1(lir_move, src, LIR_OprFact::address(dst), dst->type(), lir_patch_none, info, lir_move_wide));
2215     } else {
2216       move(src, dst, info);
2217     }
2218   }
2219   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)); }
2220 
2221   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));   }
2222   void oop2reg_patch(jobject o, LIR_Opr reg, CodeEmitInfo* info);
2223 
2224   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));   }
2225   void klass2reg_patch(Metadata* o, LIR_Opr reg, CodeEmitInfo* info);
2226 
2227   void safepoint(LIR_Opr tmp, CodeEmitInfo* info)  { append(new LIR_Op1(lir_safepoint, tmp, info)); }
2228   void return_op(LIR_Opr result)                   { append(new LIR_OpReturn(result)); }
2229 
2230   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)); }
2231 
2232   void logical_and (LIR_Opr left, LIR_Opr right, LIR_Opr dst) { append(new LIR_Op2(lir_logic_and,  left, right, dst)); }
2233   void logical_or  (LIR_Opr left, LIR_Opr right, LIR_Opr dst) { append(new LIR_Op2(lir_logic_or,   left, right, dst)); }
2234   void logical_xor (LIR_Opr left, LIR_Opr right, LIR_Opr dst) { append(new LIR_Op2(lir_logic_xor,  left, right, dst)); }
2235 
2236   void null_check(LIR_Opr opr, CodeEmitInfo* info, bool deoptimize_on_null = false);
2237   void throw_exception(LIR_Opr exceptionPC, LIR_Opr exceptionOop, CodeEmitInfo* info) {
2238     append(new LIR_Op2(lir_throw, exceptionPC, exceptionOop, LIR_OprFact::illegalOpr, info));
2239   }
2240   void unwind_exception(LIR_Opr exceptionOop) {
2241     append(new LIR_Op1(lir_unwind, exceptionOop));
2242   }
2243 
2244   void push(LIR_Opr opr)                                   { append(new LIR_Op1(lir_push, opr)); }
2245   void pop(LIR_Opr reg)                                    { append(new LIR_Op1(lir_pop,  reg)); }
2246 
2247   void cmp(LIR_Condition condition, LIR_Opr left, LIR_Opr right, CodeEmitInfo* info = NULL) {
2248     append(new LIR_Op2(lir_cmp, condition, left, right, info));
2249   }
2250   void cmp(LIR_Condition condition, LIR_Opr left, int right, CodeEmitInfo* info = NULL) {
2251     cmp(condition, left, LIR_OprFact::intConst(right), info);
2252   }
2253 
2254   void cmp_mem_int(LIR_Condition condition, LIR_Opr base, int disp, int c, CodeEmitInfo* info);
2255   void cmp_reg_mem(LIR_Condition condition, LIR_Opr reg, LIR_Address* addr, CodeEmitInfo* info);
2256 
2257   void cmove(LIR_Condition condition, LIR_Opr src1, LIR_Opr src2, LIR_Opr dst, BasicType type,
2258              LIR_Opr cmp_opr1 = LIR_OprFact::illegalOpr, LIR_Opr cmp_opr2 = LIR_OprFact::illegalOpr) {
2259     append(new LIR_Op4(lir_cmove, condition, src1, src2, cmp_opr1, cmp_opr2, dst, type));
2260   }
2261 
2262   void cas_long(LIR_Opr addr, LIR_Opr cmp_value, LIR_Opr new_value,
2263                 LIR_Opr t1, LIR_Opr t2, LIR_Opr result = LIR_OprFact::illegalOpr);
2264   void cas_obj(LIR_Opr addr, LIR_Opr cmp_value, LIR_Opr new_value,
2265                LIR_Opr t1, LIR_Opr t2, LIR_Opr result = LIR_OprFact::illegalOpr);
2266   void cas_int(LIR_Opr addr, LIR_Opr cmp_value, LIR_Opr new_value,
2267                LIR_Opr t1, LIR_Opr t2, LIR_Opr result = LIR_OprFact::illegalOpr);
2268 
2269   void abs (LIR_Opr from, LIR_Opr to, LIR_Opr tmp)                { append(new LIR_Op2(lir_abs , from, tmp, to)); }
2270   void negate(LIR_Opr from, LIR_Opr to, LIR_Opr tmp = LIR_OprFact::illegalOpr)              { append(new LIR_Op2(lir_neg, from, tmp, to)); }
2271   void sqrt(LIR_Opr from, LIR_Opr to, LIR_Opr tmp)                { append(new LIR_Op2(lir_sqrt, from, tmp, to)); }
2272   void fmad(LIR_Opr from, LIR_Opr from1, LIR_Opr from2, LIR_Opr to) { append(new LIR_Op3(lir_fmad, from, from1, from2, to)); }
2273   void fmaf(LIR_Opr from, LIR_Opr from1, LIR_Opr from2, LIR_Opr to) { append(new LIR_Op3(lir_fmaf, from, from1, from2, to)); }
2274   void log10 (LIR_Opr from, LIR_Opr to, LIR_Opr tmp)              { append(new LIR_Op2(lir_log10, from, LIR_OprFact::illegalOpr, to, tmp)); }
2275   void tan (LIR_Opr from, LIR_Opr to, LIR_Opr tmp1, LIR_Opr tmp2) { append(new LIR_Op2(lir_tan , from, tmp1, to, tmp2)); }
2276 
2277   void add (LIR_Opr left, LIR_Opr right, LIR_Opr res)      { append(new LIR_Op2(lir_add, left, right, res)); }
2278   void sub (LIR_Opr left, LIR_Opr right, LIR_Opr res, CodeEmitInfo* info = NULL) { append(new LIR_Op2(lir_sub, left, right, res, info)); }
2279   void mul (LIR_Opr left, LIR_Opr right, LIR_Opr res) { append(new LIR_Op2(lir_mul, left, right, res)); }
2280   void mul (LIR_Opr left, LIR_Opr right, LIR_Opr res, LIR_Opr tmp) { append(new LIR_Op2(lir_mul, left, right, res, tmp)); }
2281   void div (LIR_Opr left, LIR_Opr right, LIR_Opr res, CodeEmitInfo* info = NULL)      { append(new LIR_Op2(lir_div, left, right, res, info)); }
2282   void div (LIR_Opr left, LIR_Opr right, LIR_Opr res, LIR_Opr tmp) { append(new LIR_Op2(lir_div, left, right, res, tmp)); }
2283   void rem (LIR_Opr left, LIR_Opr right, LIR_Opr res, CodeEmitInfo* info = NULL)      { append(new LIR_Op2(lir_rem, left, right, res, info)); }
2284 
2285   void volatile_load_mem_reg(LIR_Address* address, LIR_Opr dst, CodeEmitInfo* info, LIR_PatchCode patch_code = lir_patch_none);
2286   void volatile_load_unsafe_reg(LIR_Opr base, LIR_Opr offset, LIR_Opr dst, BasicType type, CodeEmitInfo* info, LIR_PatchCode patch_code);
2287 
2288   void load(LIR_Address* addr, LIR_Opr src, CodeEmitInfo* info = NULL, LIR_PatchCode patch_code = lir_patch_none);
2289 
2290   void store_mem_int(jint v,    LIR_Opr base, int offset_in_bytes, BasicType type, CodeEmitInfo* info, LIR_PatchCode patch_code = lir_patch_none);
2291   void store_mem_oop(jobject o, LIR_Opr base, int offset_in_bytes, BasicType type, CodeEmitInfo* info, LIR_PatchCode patch_code = lir_patch_none);
2292   void store(LIR_Opr src, LIR_Address* addr, CodeEmitInfo* info = NULL, LIR_PatchCode patch_code = lir_patch_none);
2293   void volatile_store_mem_reg(LIR_Opr src, LIR_Address* address, CodeEmitInfo* info, LIR_PatchCode patch_code = lir_patch_none);
2294   void volatile_store_unsafe_reg(LIR_Opr src, LIR_Opr base, LIR_Opr offset, BasicType type, CodeEmitInfo* info, LIR_PatchCode patch_code);
2295 
2296   void idiv(LIR_Opr left, LIR_Opr right, LIR_Opr res, LIR_Opr tmp, CodeEmitInfo* info);
2297   void idiv(LIR_Opr left, int   right, LIR_Opr res, LIR_Opr tmp, CodeEmitInfo* info);
2298   void irem(LIR_Opr left, LIR_Opr right, LIR_Opr res, LIR_Opr tmp, CodeEmitInfo* info);
2299   void irem(LIR_Opr left, int   right, LIR_Opr res, LIR_Opr tmp, CodeEmitInfo* info);
2300 
2301   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);
2302   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);
2303 
2304   // jump is an unconditional branch
2305   void jump(BlockBegin* block) {
2306     append(new LIR_OpBranch(lir_cond_always, block));
2307   }
2308   void jump(CodeStub* stub) {
2309     append(new LIR_OpBranch(lir_cond_always, stub));
2310   }
2311   void branch(LIR_Condition cond, Label* lbl) {
2312     append(new LIR_OpBranch(cond, lbl));
2313   }
2314   // Should not be used for fp comparisons
2315   void branch(LIR_Condition cond, BlockBegin* block) {
2316     append(new LIR_OpBranch(cond, block));
2317   }
2318   // Should not be used for fp comparisons
2319   void branch(LIR_Condition cond, CodeStub* stub) {
2320     append(new LIR_OpBranch(cond, stub));
2321   }
2322   // Should only be used for fp comparisons
2323   void branch(LIR_Condition cond, BlockBegin* block, BlockBegin* unordered) {
2324     append(new LIR_OpBranch(cond, block, unordered));
2325   }
2326 
2327   void shift_left(LIR_Opr value, LIR_Opr count, LIR_Opr dst, LIR_Opr tmp);
2328   void shift_right(LIR_Opr value, LIR_Opr count, LIR_Opr dst, LIR_Opr tmp);
2329   void unsigned_shift_right(LIR_Opr value, LIR_Opr count, LIR_Opr dst, LIR_Opr tmp);
2330 
2331   void shift_left(LIR_Opr value, int count, LIR_Opr dst)       { shift_left(value, LIR_OprFact::intConst(count), dst, LIR_OprFact::illegalOpr); }
2332   void shift_right(LIR_Opr value, int count, LIR_Opr dst)      { shift_right(value, LIR_OprFact::intConst(count), dst, LIR_OprFact::illegalOpr); }
2333   void unsigned_shift_right(LIR_Opr value, int count, LIR_Opr dst) { unsigned_shift_right(value, LIR_OprFact::intConst(count), dst, LIR_OprFact::illegalOpr); }
2334 
2335   void lcmp2int(LIR_Opr left, LIR_Opr right, LIR_Opr dst)        { append(new LIR_Op2(lir_cmp_l2i,  left, right, dst)); }
2336   void fcmp2int(LIR_Opr left, LIR_Opr right, LIR_Opr dst, bool is_unordered_less);
2337 
2338   void call_runtime_leaf(address routine, LIR_Opr tmp, LIR_Opr result, LIR_OprList* arguments) {
2339     append(new LIR_OpRTCall(routine, tmp, result, arguments));
2340   }
2341 
2342   void call_runtime(address routine, LIR_Opr tmp, LIR_Opr result,
2343                     LIR_OprList* arguments, CodeEmitInfo* info) {
2344     append(new LIR_OpRTCall(routine, tmp, result, arguments, info));
2345   }
2346 
2347   void load_stack_address_monitor(int monitor_ix, LIR_Opr dst)  { append(new LIR_Op1(lir_monaddr, LIR_OprFact::intConst(monitor_ix), dst)); }
2348   void unlock_object(LIR_Opr hdr, LIR_Opr obj, LIR_Opr lock, LIR_Opr scratch, CodeStub* stub);
2349   void lock_object(LIR_Opr hdr, LIR_Opr obj, LIR_Opr lock, LIR_Opr scratch, CodeStub* stub, CodeEmitInfo* info);
2350 
2351   void breakpoint()                                                  { append(new LIR_Op0(lir_breakpoint)); }
2352 
2353   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)); }
2354 
2355   void update_crc32(LIR_Opr crc, LIR_Opr val, LIR_Opr res)  { append(new LIR_OpUpdateCRC32(crc, val, res)); }
2356 
2357   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);
2358   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);
2359 
2360   void checkcast (LIR_Opr result, LIR_Opr object, ciKlass* klass,
2361                   LIR_Opr tmp1, LIR_Opr tmp2, LIR_Opr tmp3, bool fast_check,
2362                   CodeEmitInfo* info_for_exception, CodeEmitInfo* info_for_patch, CodeStub* stub,
2363                   ciMethod* profiled_method, int profiled_bci);
2364   // MethodData* profiling
2365   void profile_call(ciMethod* method, int bci, ciMethod* callee, LIR_Opr mdo, LIR_Opr recv, LIR_Opr t1, ciKlass* cha_klass) {
2366     append(new LIR_OpProfileCall(method, bci, callee, mdo, recv, t1, cha_klass));
2367   }
2368   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) {
2369     append(new LIR_OpProfileType(LIR_OprFact::address(mdp), obj, exact_klass, current_klass, tmp, not_null, no_conflict));
2370   }
2371 
2372   void xadd(LIR_Opr src, LIR_Opr add, LIR_Opr res, LIR_Opr tmp) { append(new LIR_Op2(lir_xadd, src, add, res, tmp)); }
2373   void xchg(LIR_Opr src, LIR_Opr set, LIR_Opr res, LIR_Opr tmp) { append(new LIR_Op2(lir_xchg, src, set, res, tmp)); }
2374 
2375   void load_klass(LIR_Opr obj, LIR_Opr result, CodeEmitInfo* info, CodeStub* stub) { append(new LIR_OpLoadKlass(obj, result, info, stub)); }
2376 
2377 #ifdef ASSERT
2378   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)); }
2379 #endif
2380 };
2381 
2382 void print_LIR(BlockList* blocks);
2383 
2384 class LIR_InsertionBuffer : public CompilationResourceObj {
2385  private:
2386   LIR_List*   _lir;   // the lir list where ops of this buffer should be inserted later (NULL when uninitialized)
2387 
2388   // list of insertion points. index and count are stored alternately:
2389   // _index_and_count[i * 2]:     the index into lir list where "count" ops should be inserted
2390   // _index_and_count[i * 2 + 1]: the number of ops to be inserted at index
2391   intStack    _index_and_count;
2392 
2393   // the LIR_Ops to be inserted
2394   LIR_OpList  _ops;
2395 
2396   void append_new(int index, int count)  { _index_and_count.append(index); _index_and_count.append(count); }
2397   void set_index_at(int i, int value)    { _index_and_count.at_put((i << 1),     value); }
2398   void set_count_at(int i, int value)    { _index_and_count.at_put((i << 1) + 1, value); }
2399 
2400 #ifdef ASSERT
2401   void verify();
2402 #endif
2403  public:
2404   LIR_InsertionBuffer() : _lir(NULL), _index_and_count(8), _ops(8) { }
2405 
2406   // must be called before using the insertion buffer
2407   void init(LIR_List* lir)  { assert(!initialized(), "already initialized"); _lir = lir; _index_and_count.clear(); _ops.clear(); }
2408   bool initialized() const  { return _lir != NULL; }
2409   // called automatically when the buffer is appended to the LIR_List
2410   void finish()             { _lir = NULL; }
2411 
2412   // accessors
2413   LIR_List*  lir_list() const             { return _lir; }
2414   int number_of_insertion_points() const  { return _index_and_count.length() >> 1; }
2415   int index_at(int i) const               { return _index_and_count.at((i << 1));     }
2416   int count_at(int i) const               { return _index_and_count.at((i << 1) + 1); }
2417 
2418   int number_of_ops() const               { return _ops.length(); }
2419   LIR_Op* op_at(int i) const              { return _ops.at(i); }
2420 
2421   // append an instruction to the buffer
2422   void append(int index, LIR_Op* op);
2423 
2424   // instruction
2425   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)); }
2426 };
2427 
2428 
2429 //
2430 // LIR_OpVisitState is used for manipulating LIR_Ops in an abstract way.
2431 // Calling a LIR_Op's visit function with a LIR_OpVisitState causes
2432 // information about the input, output and temporaries used by the
2433 // op to be recorded.  It also records whether the op has call semantics
2434 // and also records all the CodeEmitInfos used by this op.
2435 //
2436 
2437 
2438 class LIR_OpVisitState: public StackObj {
2439  public:
2440   typedef enum { inputMode, firstMode = inputMode, tempMode, outputMode, numModes, invalidMode = -1 } OprMode;
2441 
2442   enum {
2443     maxNumberOfOperands = 20,
2444     maxNumberOfInfos = 4
2445   };
2446 
2447  private:
2448   LIR_Op*          _op;
2449 
2450   // optimization: the operands and infos are not stored in a variable-length
2451   //               list, but in a fixed-size array to save time of size checks and resizing
2452   int              _oprs_len[numModes];
2453   LIR_Opr*         _oprs_new[numModes][maxNumberOfOperands];
2454   int _info_len;
2455   CodeEmitInfo*    _info_new[maxNumberOfInfos];
2456 
2457   bool             _has_call;
2458   bool             _has_slow_case;
2459 
2460 
2461   // only include register operands
2462   // addresses are decomposed to the base and index registers
2463   // constants and stack operands are ignored
2464   void append(LIR_Opr& opr, OprMode mode) {
2465     assert(opr->is_valid(), "should not call this otherwise");
2466     assert(mode >= 0 && mode < numModes, "bad mode");
2467 
2468     if (opr->is_register()) {
2469        assert(_oprs_len[mode] < maxNumberOfOperands, "array overflow");
2470       _oprs_new[mode][_oprs_len[mode]++] = &opr;
2471 
2472     } else if (opr->is_pointer()) {
2473       LIR_Address* address = opr->as_address_ptr();
2474       if (address != NULL) {
2475         // special handling for addresses: add base and index register of the address
2476         // both are always input operands or temp if we want to extend
2477         // their liveness!
2478         if (mode == outputMode) {
2479           mode = inputMode;
2480         }
2481         assert (mode == inputMode || mode == tempMode, "input or temp only for addresses");
2482         if (address->_base->is_valid()) {
2483           assert(address->_base->is_register(), "must be");
2484           assert(_oprs_len[mode] < maxNumberOfOperands, "array overflow");
2485           _oprs_new[mode][_oprs_len[mode]++] = &address->_base;
2486         }
2487         if (address->_index->is_valid()) {
2488           assert(address->_index->is_register(), "must be");
2489           assert(_oprs_len[mode] < maxNumberOfOperands, "array overflow");
2490           _oprs_new[mode][_oprs_len[mode]++] = &address->_index;
2491         }
2492 
2493       } else {
2494         assert(opr->is_constant(), "constant operands are not processed");
2495       }
2496     } else {
2497       assert(opr->is_stack(), "stack operands are not processed");
2498     }
2499   }
2500 
2501   void append(CodeEmitInfo* info) {
2502     assert(info != NULL, "should not call this otherwise");
2503     assert(_info_len < maxNumberOfInfos, "array overflow");
2504     _info_new[_info_len++] = info;
2505   }
2506 
2507  public:
2508   LIR_OpVisitState()         { reset(); }
2509 
2510   LIR_Op* op() const         { return _op; }
2511   void set_op(LIR_Op* op)    { reset(); _op = op; }
2512 
2513   bool has_call() const      { return _has_call; }
2514   bool has_slow_case() const { return _has_slow_case; }
2515 
2516   void reset() {
2517     _op = NULL;
2518     _has_call = false;
2519     _has_slow_case = false;
2520 
2521     _oprs_len[inputMode] = 0;
2522     _oprs_len[tempMode] = 0;
2523     _oprs_len[outputMode] = 0;
2524     _info_len = 0;
2525   }
2526 
2527 
2528   int opr_count(OprMode mode) const {
2529     assert(mode >= 0 && mode < numModes, "bad mode");
2530     return _oprs_len[mode];
2531   }
2532 
2533   LIR_Opr opr_at(OprMode mode, int index) const {
2534     assert(mode >= 0 && mode < numModes, "bad mode");
2535     assert(index >= 0 && index < _oprs_len[mode], "index out of bound");
2536     return *_oprs_new[mode][index];
2537   }
2538 
2539   void set_opr_at(OprMode mode, int index, LIR_Opr opr) const {
2540     assert(mode >= 0 && mode < numModes, "bad mode");
2541     assert(index >= 0 && index < _oprs_len[mode], "index out of bound");
2542     *_oprs_new[mode][index] = opr;
2543   }
2544 
2545   int info_count() const {
2546     return _info_len;
2547   }
2548 
2549   CodeEmitInfo* info_at(int index) const {
2550     assert(index < _info_len, "index out of bounds");
2551     return _info_new[index];
2552   }
2553 
2554   XHandlers* all_xhandler();
2555 
2556   // collects all register operands of the instruction
2557   void visit(LIR_Op* op);
2558 
2559 #ifdef ASSERT
2560   // check that an operation has no operands
2561   bool no_operands(LIR_Op* op);
2562 #endif
2563 
2564   // LIR_Op visitor functions use these to fill in the state
2565   void do_input(LIR_Opr& opr)             { append(opr, LIR_OpVisitState::inputMode); }
2566   void do_output(LIR_Opr& opr)            { append(opr, LIR_OpVisitState::outputMode); }
2567   void do_temp(LIR_Opr& opr)              { append(opr, LIR_OpVisitState::tempMode); }
2568   void do_info(CodeEmitInfo* info)        { append(info); }
2569 
2570   void do_stub(CodeStub* stub);
2571   void do_call()                          { _has_call = true; }
2572   void do_slow_case()                     { _has_slow_case = true; }
2573   void do_slow_case(CodeEmitInfo* info) {
2574     _has_slow_case = true;
2575     append(info);
2576   }
2577 };
2578 
2579 
2580 inline LIR_Opr LIR_Opr::illegalOpr()   { return LIR_OprFact::illegalOpr; };
2581 
2582 inline LIR_Opr LIR_Opr::nullOpr()   { return LIR_OprFact::nullOpr; };
2583 
2584 #endif // SHARE_C1_C1_LIR_HPP