jdk8-mips64-public/hotspot: src/cpu/x86/vm/templateTable_x86

src/cpu/x86/vm/templateTable_x86_32.cpp@37f87013dfd8 (annotated)

src/cpu/x86/vm/templateTable_x86_32.cpp

Thu, 05 Jun 2008 15:57:56 -0700

author: ysr
date: Thu, 05 Jun 2008 15:57:56 -0700
changeset 777: 37f87013dfd8
parent 542: 93b6525e3b82
child 791: 1ee8caae33af
permissions: -rw-r--r--

6711316: Open source the Garbage-First garbage collector
Summary: First mercurial integration of the code for the Garbage-First garbage collector.
Reviewed-by: apetrusenko, iveresov, jmasa, sgoldman, tonyp, ysr

 /*
  * Copyright 1997-2007 Sun Microsystems, Inc.  All Rights Reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  * CA 95054 USA or visit www.sun.com if you need additional information or
  * have any questions.
  *
  */
 #include "incls/_precompiled.incl"
 #include "incls/_templateTable_x86_32.cpp.incl"
 #ifndef CC_INTERP
 #define __ _masm->
 //----------------------------------------------------------------------------------------------------
 // Platform-dependent initialization
 void TemplateTable::pd_initialize() {
   // No i486 specific initialization
 }
 //----------------------------------------------------------------------------------------------------
 // Address computation
 // local variables
 static inline Address iaddress(int n)            {
   return Address(rdi, Interpreter::local_offset_in_bytes(n));
 }
 static inline Address laddress(int n)            { return iaddress(n + 1); }
 static inline Address haddress(int n)            { return iaddress(n + 0); }
 static inline Address faddress(int n)            { return iaddress(n); }
 static inline Address daddress(int n)            { return laddress(n); }
 static inline Address aaddress(int n)            { return iaddress(n); }
 static inline Address iaddress(Register r)       {
   return Address(rdi, r, Interpreter::stackElementScale(), Interpreter::value_offset_in_bytes());
 }
 static inline Address laddress(Register r)       {
   return Address(rdi, r, Interpreter::stackElementScale(), Interpreter::local_offset_in_bytes(1));
 }
 static inline Address haddress(Register r)       {
   return Address(rdi, r, Interpreter::stackElementScale(), Interpreter::local_offset_in_bytes(0));
 }
 static inline Address faddress(Register r)       { return iaddress(r); };
 static inline Address daddress(Register r)       {
   assert(!TaggedStackInterpreter, "This doesn't work");
   return laddress(r);
 };
 static inline Address aaddress(Register r)       { return iaddress(r); };
 // expression stack
 // (Note: Must not use symmetric equivalents at_rsp_m1/2 since they store
 // data beyond the rsp which is potentially unsafe in an MT environment;
 // an interrupt may overwrite that data.)
 static inline Address at_rsp   () {
   return Address(rsp, 0);
 }
 // At top of Java expression stack which may be different than rsp().  It
 // isn't for category 1 objects.
 static inline Address at_tos   () {
   Address tos = Address(rsp,  Interpreter::expr_offset_in_bytes(0));
   return tos;
 }
 static inline Address at_tos_p1() {
   return Address(rsp,  Interpreter::expr_offset_in_bytes(1));
 }
 static inline Address at_tos_p2() {
   return Address(rsp,  Interpreter::expr_offset_in_bytes(2));
 }
 // Condition conversion
 static Assembler::Condition j_not(TemplateTable::Condition cc) {
   switch (cc) {
     case TemplateTable::equal        : return Assembler::notEqual;
     case TemplateTable::not_equal    : return Assembler::equal;
     case TemplateTable::less         : return Assembler::greaterEqual;
     case TemplateTable::less_equal   : return Assembler::greater;
     case TemplateTable::greater      : return Assembler::lessEqual;
     case TemplateTable::greater_equal: return Assembler::less;
   }
   ShouldNotReachHere();
   return Assembler::zero;
 }
 //----------------------------------------------------------------------------------------------------
 // Miscelaneous helper routines
 // Store an oop (or NULL) at the address described by obj.
 // If val == noreg this means store a NULL
 static void do_oop_store(InterpreterMacroAssembler* _masm,
                          Address obj,
                          Register val,
                          BarrierSet::Name barrier,
                          bool precise) {
   assert(val == noreg || val == rax, "parameter is just for looks");
   switch (barrier) {
 #ifndef SERIALGC
     case BarrierSet::G1SATBCT:
     case BarrierSet::G1SATBCTLogging:
       {
         // flatten object address if needed
         // We do it regardless of precise because we need the registers
         if (obj.index() == noreg && obj.disp() == 0) {
           if (obj.base() != rdx) {
             __ movl(rdx, obj.base());
           }
         } else {
           __ leal(rdx, obj);
         }
         __ get_thread(rcx);
         __ save_bcp();
         __ g1_write_barrier_pre(rdx, rcx, rsi, rbx, val != noreg);
         // Do the actual store
         // noreg means NULL
         if (val == noreg) {
           __ movl(Address(rdx, 0), NULL_WORD);
           // No post barrier for NULL
         } else {
           __ movl(Address(rdx, 0), val);
           __ g1_write_barrier_post(rdx, rax, rcx, rbx, rsi);
         }
         __ restore_bcp();
       }
       break;
 #endif // SERIALGC
     case BarrierSet::CardTableModRef:
     case BarrierSet::CardTableExtension:
       {
         if (val == noreg) {
           __ movl(obj, NULL_WORD);
         } else {
           __ movl(obj, val);
           // flatten object address if needed
           if (!precise || (obj.index() == noreg && obj.disp() == 0)) {
             __ store_check(obj.base());
           } else {
             __ leal(rdx, obj);
             __ store_check(rdx);
           }
         }
       }
       break;
     case BarrierSet::ModRef:
     case BarrierSet::Other:
       if (val == noreg) {
         __ movl(obj, NULL_WORD);
       } else {
         __ movl(obj, val);
       }
       break;
     default      :
       ShouldNotReachHere();
   }
 }
 Address TemplateTable::at_bcp(int offset) {
   assert(_desc->uses_bcp(), "inconsistent uses_bcp information");
   return Address(rsi, offset);
 }
 void TemplateTable::patch_bytecode(Bytecodes::Code bytecode, Register bc,
                                    Register scratch,
                                    bool load_bc_into_scratch/*=true*/) {
   if (!RewriteBytecodes) return;
   // the pair bytecodes have already done the load.
   if (load_bc_into_scratch) __ movl(bc, bytecode);
   Label patch_done;
   if (JvmtiExport::can_post_breakpoint()) {
     Label fast_patch;
     // if a breakpoint is present we can't rewrite the stream directly
     __ movzxb(scratch, at_bcp(0));
     __ cmpl(scratch, Bytecodes::_breakpoint);
     __ jcc(Assembler::notEqual, fast_patch);
     __ get_method(scratch);
     // Let breakpoint table handling rewrite to quicker bytecode
     __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::set_original_bytecode_at), scratch, rsi, bc);
 #ifndef ASSERT
     __ jmpb(patch_done);
     __ bind(fast_patch);
   }
 #else
     __ jmp(patch_done);
     __ bind(fast_patch);
   }
   Label okay;
   __ load_unsigned_byte(scratch, at_bcp(0));
   __ cmpl(scratch, (int)Bytecodes::java_code(bytecode));
   __ jccb(Assembler::equal, okay);
   __ cmpl(scratch, bc);
   __ jcc(Assembler::equal, okay);
   __ stop("patching the wrong bytecode");
   __ bind(okay);
 #endif
   // patch bytecode
   __ movb(at_bcp(0), bc);
   __ bind(patch_done);
 }
 //----------------------------------------------------------------------------------------------------
 // Individual instructions
 void TemplateTable::nop() {
   transition(vtos, vtos);
   // nothing to do
 }
 void TemplateTable::shouldnotreachhere() {
   transition(vtos, vtos);
   __ stop("shouldnotreachhere bytecode");
 }
 void TemplateTable::aconst_null() {
   transition(vtos, atos);
   __ xorl(rax, rax);
 }
 void TemplateTable::iconst(int value) {
   transition(vtos, itos);
   if (value == 0) {
     __ xorl(rax, rax);
   } else {
     __ movl(rax, value);
   }
 }
 void TemplateTable::lconst(int value) {
   transition(vtos, ltos);
   if (value == 0) {
     __ xorl(rax, rax);
   } else {
     __ movl(rax, value);
   }
   assert(value >= 0, "check this code");
   __ xorl(rdx, rdx);
 }
 void TemplateTable::fconst(int value) {
   transition(vtos, ftos);
          if (value == 0) { __ fldz();
   } else if (value == 1) { __ fld1();
   } else if (value == 2) { __ fld1(); __ fld1(); __ faddp(); // should do a better solution here
   } else                 { ShouldNotReachHere();
   }
 }
 void TemplateTable::dconst(int value) {
   transition(vtos, dtos);
          if (value == 0) { __ fldz();
   } else if (value == 1) { __ fld1();
   } else                 { ShouldNotReachHere();
   }
 }
 void TemplateTable::bipush() {
   transition(vtos, itos);
   __ load_signed_byte(rax, at_bcp(1));
 }
 void TemplateTable::sipush() {
   transition(vtos, itos);
   __ load_unsigned_word(rax, at_bcp(1));
   __ bswap(rax);
   __ sarl(rax, 16);
 }
 void TemplateTable::ldc(bool wide) {
   transition(vtos, vtos);
   Label call_ldc, notFloat, notClass, Done;
   if (wide) {
     __ get_unsigned_2_byte_index_at_bcp(rbx, 1);
   } else {
     __ load_unsigned_byte(rbx, at_bcp(1));
   }
   __ get_cpool_and_tags(rcx, rax);
   const int base_offset = constantPoolOopDesc::header_size() * wordSize;
   const int tags_offset = typeArrayOopDesc::header_size(T_BYTE) * wordSize;
   // get type
   __ xorl(rdx, rdx);
   __ movb(rdx, Address(rax, rbx, Address::times_1, tags_offset));
   // unresolved string - get the resolved string
   __ cmpl(rdx, JVM_CONSTANT_UnresolvedString);
   __ jccb(Assembler::equal, call_ldc);
   // unresolved class - get the resolved class
   __ cmpl(rdx, JVM_CONSTANT_UnresolvedClass);
   __ jccb(Assembler::equal, call_ldc);
   // unresolved class in error (resolution failed) - call into runtime
   // so that the same error from first resolution attempt is thrown.
   __ cmpl(rdx, JVM_CONSTANT_UnresolvedClassInError);
   __ jccb(Assembler::equal, call_ldc);
   // resolved class - need to call vm to get java mirror of the class
   __ cmpl(rdx, JVM_CONSTANT_Class);
   __ jcc(Assembler::notEqual, notClass);
   __ bind(call_ldc);
   __ movl(rcx, wide);
   call_VM(rax, CAST_FROM_FN_PTR(address, InterpreterRuntime::ldc), rcx);
   __ push(atos);
   __ jmp(Done);
   __ bind(notClass);
   __ cmpl(rdx, JVM_CONSTANT_Float);
   __ jccb(Assembler::notEqual, notFloat);
   // ftos
   __ fld_s(    Address(rcx, rbx, Address::times_4, base_offset));
   __ push(ftos);
   __ jmp(Done);
   __ bind(notFloat);
 #ifdef ASSERT
   { Label L;
     __ cmpl(rdx, JVM_CONSTANT_Integer);
     __ jcc(Assembler::equal, L);
     __ cmpl(rdx, JVM_CONSTANT_String);
     __ jcc(Assembler::equal, L);
     __ stop("unexpected tag type in ldc");
     __ bind(L);
   }
 #endif
   Label isOop;
   // atos and itos
   __ movl(rax, Address(rcx, rbx, Address::times_4, base_offset));
   // String is only oop type we will see here
   __ cmpl(rdx, JVM_CONSTANT_String);
   __ jccb(Assembler::equal, isOop);
   __ push(itos);
   __ jmp(Done);
   __ bind(isOop);
   __ push(atos);
   if (VerifyOops) {
     __ verify_oop(rax);
   }
   __ bind(Done);
 }
 void TemplateTable::ldc2_w() {
   transition(vtos, vtos);
   Label Long, Done;
   __ get_unsigned_2_byte_index_at_bcp(rbx, 1);
   __ get_cpool_and_tags(rcx, rax);
   const int base_offset = constantPoolOopDesc::header_size() * wordSize;
   const int tags_offset = typeArrayOopDesc::header_size(T_BYTE) * wordSize;
   // get type
   __ cmpb(Address(rax, rbx, Address::times_1, tags_offset), JVM_CONSTANT_Double);
   __ jccb(Assembler::notEqual, Long);
   // dtos
   __ fld_d(    Address(rcx, rbx, Address::times_4, base_offset));
   __ push(dtos);
   __ jmpb(Done);
   __ bind(Long);
   // ltos
   __ movl(rax, Address(rcx, rbx, Address::times_4, base_offset + 0 * wordSize));
   __ movl(rdx, Address(rcx, rbx, Address::times_4, base_offset + 1 * wordSize));
   __ push(ltos);
   __ bind(Done);
 }
 void TemplateTable::locals_index(Register reg, int offset) {
   __ load_unsigned_byte(reg, at_bcp(offset));
   __ negl(reg);
 }
 void TemplateTable::iload() {
   transition(vtos, itos);
   if (RewriteFrequentPairs) {
     Label rewrite, done;
     // get next byte
     __ load_unsigned_byte(rbx, at_bcp(Bytecodes::length_for(Bytecodes::_iload)));
     // if _iload, wait to rewrite to iload2.  We only want to rewrite the
     // last two iloads in a pair.  Comparing against fast_iload means that
     // the next bytecode is neither an iload or a caload, and therefore
     // an iload pair.
     __ cmpl(rbx, Bytecodes::_iload);
     __ jcc(Assembler::equal, done);
     __ cmpl(rbx, Bytecodes::_fast_iload);
     __ movl(rcx, Bytecodes::_fast_iload2);
     __ jccb(Assembler::equal, rewrite);
     // if _caload, rewrite to fast_icaload
     __ cmpl(rbx, Bytecodes::_caload);
     __ movl(rcx, Bytecodes::_fast_icaload);
     __ jccb(Assembler::equal, rewrite);
     // rewrite so iload doesn't check again.
     __ movl(rcx, Bytecodes::_fast_iload);
     // rewrite
     // rcx: fast bytecode
     __ bind(rewrite);
     patch_bytecode(Bytecodes::_iload, rcx, rbx, false);
     __ bind(done);
   }
   // Get the local value into tos
   locals_index(rbx);
   __ movl(rax, iaddress(rbx));
   debug_only(__ verify_local_tag(frame::TagValue, rbx));
 }
 void TemplateTable::fast_iload2() {
   transition(vtos, itos);
   locals_index(rbx);
   __ movl(rax, iaddress(rbx));
   debug_only(__ verify_local_tag(frame::TagValue, rbx));
   __ push(itos);
   locals_index(rbx, 3);
   __ movl(rax, iaddress(rbx));
   debug_only(__ verify_local_tag(frame::TagValue, rbx));
 }
 void TemplateTable::fast_iload() {
   transition(vtos, itos);
   locals_index(rbx);
   __ movl(rax, iaddress(rbx));
   debug_only(__ verify_local_tag(frame::TagValue, rbx));
 }
 void TemplateTable::lload() {
   transition(vtos, ltos);
   locals_index(rbx);
   __ movl(rax, laddress(rbx));
   __ movl(rdx, haddress(rbx));
   debug_only(__ verify_local_tag(frame::TagCategory2, rbx));
 }
 void TemplateTable::fload() {
   transition(vtos, ftos);
   locals_index(rbx);
   __ fld_s(faddress(rbx));
   debug_only(__ verify_local_tag(frame::TagValue, rbx));
 }
 void TemplateTable::dload() {
   transition(vtos, dtos);
   locals_index(rbx);
   if (TaggedStackInterpreter) {
     // Get double out of locals array, onto temp stack and load with
     // float instruction into ST0
     __ movl(rax, laddress(rbx));
     __ movl(rdx, haddress(rbx));
     __ pushl(rdx);  // push hi first
     __ pushl(rax);
     __ fld_d(Address(rsp, 0));
     __ addl(rsp, 2*wordSize);
     debug_only(__ verify_local_tag(frame::TagCategory2, rbx));
   } else {
     __ fld_d(daddress(rbx));
   }
 }
 void TemplateTable::aload() {
   transition(vtos, atos);
   locals_index(rbx);
   __ movl(rax, iaddress(rbx));
   debug_only(__ verify_local_tag(frame::TagReference, rbx));
 }
 void TemplateTable::locals_index_wide(Register reg) {
   __ movl(reg, at_bcp(2));
   __ bswap(reg);
   __ shrl(reg, 16);
   __ negl(reg);
 }
 void TemplateTable::wide_iload() {
   transition(vtos, itos);
   locals_index_wide(rbx);
   __ movl(rax, iaddress(rbx));
   debug_only(__ verify_local_tag(frame::TagValue, rbx));
 }
 void TemplateTable::wide_lload() {
   transition(vtos, ltos);
   locals_index_wide(rbx);
   __ movl(rax, laddress(rbx));
   __ movl(rdx, haddress(rbx));
   debug_only(__ verify_local_tag(frame::TagCategory2, rbx));
 }
 void TemplateTable::wide_fload() {
   transition(vtos, ftos);
   locals_index_wide(rbx);
   __ fld_s(faddress(rbx));
   debug_only(__ verify_local_tag(frame::TagValue, rbx));
 }
 void TemplateTable::wide_dload() {
   transition(vtos, dtos);
   locals_index_wide(rbx);
   if (TaggedStackInterpreter) {
     // Get double out of locals array, onto temp stack and load with
     // float instruction into ST0
     __ movl(rax, laddress(rbx));
     __ movl(rdx, haddress(rbx));
     __ pushl(rdx);  // push hi first
     __ pushl(rax);
     __ fld_d(Address(rsp, 0));
     __ addl(rsp, 2*wordSize);
     debug_only(__ verify_local_tag(frame::TagCategory2, rbx));
   } else {
     __ fld_d(daddress(rbx));
   }
 }
 void TemplateTable::wide_aload() {
   transition(vtos, atos);
   locals_index_wide(rbx);
   __ movl(rax, iaddress(rbx));
   debug_only(__ verify_local_tag(frame::TagReference, rbx));
 }
 void TemplateTable::index_check(Register array, Register index) {
   // Pop ptr into array
   __ pop_ptr(array);
   index_check_without_pop(array, index);
 }
 void TemplateTable::index_check_without_pop(Register array, Register index) {
   // destroys rbx,
   // check array
   __ null_check(array, arrayOopDesc::length_offset_in_bytes());
   // check index
   __ cmpl(index, Address(array, arrayOopDesc::length_offset_in_bytes()));
   if (index != rbx) {
     // ??? convention: move aberrant index into rbx, for exception message
     assert(rbx != array, "different registers");
     __ movl(rbx, index);
   }
   __ jump_cc(Assembler::aboveEqual,
              ExternalAddress(Interpreter::_throw_ArrayIndexOutOfBoundsException_entry));
 }
 void TemplateTable::iaload() {
   transition(itos, itos);
   // rdx: array
   index_check(rdx, rax);  // kills rbx,
   // rax,: index
   __ movl(rax, Address(rdx, rax, Address::times_4, arrayOopDesc::base_offset_in_bytes(T_INT)));
 }
 void TemplateTable::laload() {
   transition(itos, ltos);
   // rax,: index
   // rdx: array
   index_check(rdx, rax);
   __ movl(rbx, rax);
   // rbx,: index
   __ movl(rax, Address(rdx, rbx, Address::times_8, arrayOopDesc::base_offset_in_bytes(T_LONG) + 0 * wordSize));
   __ movl(rdx, Address(rdx, rbx, Address::times_8, arrayOopDesc::base_offset_in_bytes(T_LONG) + 1 * wordSize));
 }
 void TemplateTable::faload() {
   transition(itos, ftos);
   // rdx: array
   index_check(rdx, rax);  // kills rbx,
   // rax,: index
   __ fld_s(Address(rdx, rax, Address::times_4, arrayOopDesc::base_offset_in_bytes(T_FLOAT)));
 }
 void TemplateTable::daload() {
   transition(itos, dtos);
   // rdx: array
   index_check(rdx, rax);  // kills rbx,
   // rax,: index
   __ fld_d(Address(rdx, rax, Address::times_8, arrayOopDesc::base_offset_in_bytes(T_DOUBLE)));
 }
 void TemplateTable::aaload() {
   transition(itos, atos);
   // rdx: array
   index_check(rdx, rax);  // kills rbx,
   // rax,: index
   __ movl(rax, Address(rdx, rax, Address::times_4, arrayOopDesc::base_offset_in_bytes(T_OBJECT)));
 }
 void TemplateTable::baload() {
   transition(itos, itos);
   // rdx: array
   index_check(rdx, rax);  // kills rbx,
   // rax,: index
   // can do better code for P5 - fix this at some point
   __ load_signed_byte(rbx, Address(rdx, rax, Address::times_1, arrayOopDesc::base_offset_in_bytes(T_BYTE)));
   __ movl(rax, rbx);
 }
 void TemplateTable::caload() {
   transition(itos, itos);
   // rdx: array
   index_check(rdx, rax);  // kills rbx,
   // rax,: index
   // can do better code for P5 - may want to improve this at some point
   __ load_unsigned_word(rbx, Address(rdx, rax, Address::times_2, arrayOopDesc::base_offset_in_bytes(T_CHAR)));
   __ movl(rax, rbx);
 }
 // iload followed by caload frequent pair
 void TemplateTable::fast_icaload() {
   transition(vtos, itos);
   // load index out of locals
   locals_index(rbx);
   __ movl(rax, iaddress(rbx));
   debug_only(__ verify_local_tag(frame::TagValue, rbx));
   // rdx: array
   index_check(rdx, rax);
   // rax,: index
   __ load_unsigned_word(rbx, Address(rdx, rax, Address::times_2, arrayOopDesc::base_offset_in_bytes(T_CHAR)));
   __ movl(rax, rbx);
 }
 void TemplateTable::saload() {
   transition(itos, itos);
   // rdx: array
   index_check(rdx, rax);  // kills rbx,
   // rax,: index
   // can do better code for P5 - may want to improve this at some point
   __ load_signed_word(rbx, Address(rdx, rax, Address::times_2, arrayOopDesc::base_offset_in_bytes(T_SHORT)));
   __ movl(rax, rbx);
 }
 void TemplateTable::iload(int n) {
   transition(vtos, itos);
   __ movl(rax, iaddress(n));
   debug_only(__ verify_local_tag(frame::TagValue, n));
 }
 void TemplateTable::lload(int n) {
   transition(vtos, ltos);
   __ movl(rax, laddress(n));
   __ movl(rdx, haddress(n));
   debug_only(__ verify_local_tag(frame::TagCategory2, n));
 }
 void TemplateTable::fload(int n) {
   transition(vtos, ftos);
   __ fld_s(faddress(n));
   debug_only(__ verify_local_tag(frame::TagValue, n));
 }
 void TemplateTable::dload(int n) {
   transition(vtos, dtos);
   if (TaggedStackInterpreter) {
     // Get double out of locals array, onto temp stack and load with
     // float instruction into ST0
     __ movl(rax, laddress(n));
     __ movl(rdx, haddress(n));
     __ pushl(rdx);  // push hi first
     __ pushl(rax);
     __ fld_d(Address(rsp, 0));
     __ addl(rsp, 2*wordSize);  // reset rsp
     debug_only(__ verify_local_tag(frame::TagCategory2, n));
   } else {
     __ fld_d(daddress(n));
   }
 }
 void TemplateTable::aload(int n) {
   transition(vtos, atos);
   __ movl(rax, aaddress(n));
   debug_only(__ verify_local_tag(frame::TagReference, n));
 }
 void TemplateTable::aload_0() {
   transition(vtos, atos);
   // According to bytecode histograms, the pairs:
   //
   // _aload_0, _fast_igetfield
   // _aload_0, _fast_agetfield
   // _aload_0, _fast_fgetfield
   //
   // occur frequently. If RewriteFrequentPairs is set, the (slow) _aload_0
   // bytecode checks if the next bytecode is either _fast_igetfield,
   // _fast_agetfield or _fast_fgetfield and then rewrites the
   // current bytecode into a pair bytecode; otherwise it rewrites the current
   // bytecode into _fast_aload_0 that doesn't do the pair check anymore.
   //
   // Note: If the next bytecode is _getfield, the rewrite must be delayed,
   //       otherwise we may miss an opportunity for a pair.
   //
   // Also rewrite frequent pairs
   //   aload_0, aload_1
   //   aload_0, iload_1
   // These bytecodes with a small amount of code are most profitable to rewrite
   if (RewriteFrequentPairs) {
     Label rewrite, done;
     // get next byte
     __ load_unsigned_byte(rbx, at_bcp(Bytecodes::length_for(Bytecodes::_aload_0)));
     // do actual aload_0
     aload(0);
     // if _getfield then wait with rewrite
     __ cmpl(rbx, Bytecodes::_getfield);
     __ jcc(Assembler::equal, done);
     // if _igetfield then reqrite to _fast_iaccess_0
     assert(Bytecodes::java_code(Bytecodes::_fast_iaccess_0) == Bytecodes::_aload_0, "fix bytecode definition");
     __ cmpl(rbx, Bytecodes::_fast_igetfield);
     __ movl(rcx, Bytecodes::_fast_iaccess_0);
     __ jccb(Assembler::equal, rewrite);
     // if _agetfield then reqrite to _fast_aaccess_0
     assert(Bytecodes::java_code(Bytecodes::_fast_aaccess_0) == Bytecodes::_aload_0, "fix bytecode definition");
     __ cmpl(rbx, Bytecodes::_fast_agetfield);
     __ movl(rcx, Bytecodes::_fast_aaccess_0);
     __ jccb(Assembler::equal, rewrite);
     // if _fgetfield then reqrite to _fast_faccess_0
     assert(Bytecodes::java_code(Bytecodes::_fast_faccess_0) == Bytecodes::_aload_0, "fix bytecode definition");
     __ cmpl(rbx, Bytecodes::_fast_fgetfield);
     __ movl(rcx, Bytecodes::_fast_faccess_0);
     __ jccb(Assembler::equal, rewrite);
     // else rewrite to _fast_aload0
     assert(Bytecodes::java_code(Bytecodes::_fast_aload_0) == Bytecodes::_aload_0, "fix bytecode definition");
     __ movl(rcx, Bytecodes::_fast_aload_0);
     // rewrite
     // rcx: fast bytecode
     __ bind(rewrite);
     patch_bytecode(Bytecodes::_aload_0, rcx, rbx, false);
     __ bind(done);
   } else {
     aload(0);
   }
 }
 void TemplateTable::istore() {
   transition(itos, vtos);
   locals_index(rbx);
   __ movl(iaddress(rbx), rax);
   __ tag_local(frame::TagValue, rbx);
 }
 void TemplateTable::lstore() {
   transition(ltos, vtos);
   locals_index(rbx);
   __ movl(laddress(rbx), rax);
   __ movl(haddress(rbx), rdx);
   __ tag_local(frame::TagCategory2, rbx);
 }
 void TemplateTable::fstore() {
   transition(ftos, vtos);
   locals_index(rbx);
   __ fstp_s(faddress(rbx));
   __ tag_local(frame::TagValue, rbx);
 }
 void TemplateTable::dstore() {
   transition(dtos, vtos);
   locals_index(rbx);
   if (TaggedStackInterpreter) {
     // Store double on stack and reload into locals nonadjacently
     __ subl(rsp, 2 * wordSize);
     __ fstp_d(Address(rsp, 0));
     __ popl(rax);
     __ popl(rdx);
     __ movl(laddress(rbx), rax);
     __ movl(haddress(rbx), rdx);
     __ tag_local(frame::TagCategory2, rbx);
   } else {
     __ fstp_d(daddress(rbx));
   }
 }
 void TemplateTable::astore() {
   transition(vtos, vtos);
   __ pop_ptr(rax, rdx);   // will need to pop tag too
   locals_index(rbx);
   __ movl(aaddress(rbx), rax);
   __ tag_local(rdx, rbx);    // need to store same tag in local may be returnAddr
 }
 void TemplateTable::wide_istore() {
   transition(vtos, vtos);
   __ pop_i(rax);
   locals_index_wide(rbx);
   __ movl(iaddress(rbx), rax);
   __ tag_local(frame::TagValue, rbx);
 }
 void TemplateTable::wide_lstore() {
   transition(vtos, vtos);
   __ pop_l(rax, rdx);
   locals_index_wide(rbx);
   __ movl(laddress(rbx), rax);
   __ movl(haddress(rbx), rdx);
   __ tag_local(frame::TagCategory2, rbx);
 }
 void TemplateTable::wide_fstore() {
   wide_istore();
 }
 void TemplateTable::wide_dstore() {
   wide_lstore();
 }
 void TemplateTable::wide_astore() {
   transition(vtos, vtos);
   __ pop_ptr(rax, rdx);
   locals_index_wide(rbx);
   __ movl(aaddress(rbx), rax);
   __ tag_local(rdx, rbx);
 }
 void TemplateTable::iastore() {
   transition(itos, vtos);
   __ pop_i(rbx);
   // rax,: value
   // rdx: array
   index_check(rdx, rbx);  // prefer index in rbx,
   // rbx,: index
   __ movl(Address(rdx, rbx, Address::times_4, arrayOopDesc::base_offset_in_bytes(T_INT)), rax);
 }
 void TemplateTable::lastore() {
   transition(ltos, vtos);
   __ pop_i(rbx);
   // rax,: low(value)
   // rcx: array
   // rdx: high(value)
   index_check(rcx, rbx);  // prefer index in rbx,
   // rbx,: index
   __ movl(Address(rcx, rbx, Address::times_8, arrayOopDesc::base_offset_in_bytes(T_LONG) + 0 * wordSize), rax);
   __ movl(Address(rcx, rbx, Address::times_8, arrayOopDesc::base_offset_in_bytes(T_LONG) + 1 * wordSize), rdx);
 }
 void TemplateTable::fastore() {
   transition(ftos, vtos);
   __ pop_i(rbx);
   // rdx: array
   // st0: value
   index_check(rdx, rbx);  // prefer index in rbx,
   // rbx,: index
   __ fstp_s(Address(rdx, rbx, Address::times_4, arrayOopDesc::base_offset_in_bytes(T_FLOAT)));
 }
 void TemplateTable::dastore() {
   transition(dtos, vtos);
   __ pop_i(rbx);
   // rdx: array
   // st0: value
   index_check(rdx, rbx);  // prefer index in rbx,
   // rbx,: index
   __ fstp_d(Address(rdx, rbx, Address::times_8, arrayOopDesc::base_offset_in_bytes(T_DOUBLE)));
 }
 void TemplateTable::aastore() {
   Label is_null, ok_is_subtype, done;
   transition(vtos, vtos);
   // stack: ..., array, index, value
   __ movl(rax, at_tos());     // Value
   __ movl(rcx, at_tos_p1());  // Index
   __ movl(rdx, at_tos_p2());  // Array
   Address element_address(rdx, rcx, Address::times_4, arrayOopDesc::base_offset_in_bytes(T_OBJECT));
   index_check_without_pop(rdx, rcx);      // kills rbx,
   // do array store check - check for NULL value first
   __ testl(rax, rax);
   __ jcc(Assembler::zero, is_null);
   // Move subklass into EBX
   __ movl(rbx, Address(rax, oopDesc::klass_offset_in_bytes()));
   // Move superklass into EAX
   __ movl(rax, Address(rdx, oopDesc::klass_offset_in_bytes()));
   __ movl(rax, Address(rax, sizeof(oopDesc) + objArrayKlass::element_klass_offset_in_bytes()));
   // Compress array+index*4+12 into a single register.  Frees ECX.
   __ leal(rdx, element_address);
   // Generate subtype check.  Blows ECX.  Resets EDI to locals.
   // Superklass in EAX.  Subklass in EBX.
   __ gen_subtype_check( rbx, ok_is_subtype );
   // Come here on failure
   // object is at TOS
   __ jump(ExternalAddress(Interpreter::_throw_ArrayStoreException_entry));
   // Come here on success
   __ bind(ok_is_subtype);
   // Get the value to store
   __ movl(rax, at_rsp());
   // and store it with appropriate barrier
   do_oop_store(_masm, Address(rdx, 0), rax, _bs->kind(), true);
   __ jmp(done);
   // Have a NULL in EAX, EDX=array, ECX=index.  Store NULL at ary[idx]
   __ bind(is_null);
   __ profile_null_seen(rbx);
   // Store NULL, (noreg means NULL to do_oop_store)
   do_oop_store(_masm, element_address, noreg, _bs->kind(), true);
   // Pop stack arguments
   __ bind(done);
   __ addl(rsp, 3 * Interpreter::stackElementSize());
 }
 void TemplateTable::bastore() {
   transition(itos, vtos);
   __ pop_i(rbx);
   // rax,: value
   // rdx: array
   index_check(rdx, rbx);  // prefer index in rbx,
   // rbx,: index
   __ movb(Address(rdx, rbx, Address::times_1, arrayOopDesc::base_offset_in_bytes(T_BYTE)), rax);
 }
 void TemplateTable::castore() {
   transition(itos, vtos);
   __ pop_i(rbx);
   // rax,: value
   // rdx: array
   index_check(rdx, rbx);  // prefer index in rbx,
   // rbx,: index
   __ movw(Address(rdx, rbx, Address::times_2, arrayOopDesc::base_offset_in_bytes(T_CHAR)), rax);
 }
 void TemplateTable::sastore() {
   castore();
 }
 void TemplateTable::istore(int n) {
   transition(itos, vtos);
   __ movl(iaddress(n), rax);
   __ tag_local(frame::TagValue, n);
 }
 void TemplateTable::lstore(int n) {
   transition(ltos, vtos);
   __ movl(laddress(n), rax);
   __ movl(haddress(n), rdx);
   __ tag_local(frame::TagCategory2, n);
 }
 void TemplateTable::fstore(int n) {
   transition(ftos, vtos);
   __ fstp_s(faddress(n));
   __ tag_local(frame::TagValue, n);
 }
 void TemplateTable::dstore(int n) {
   transition(dtos, vtos);
   if (TaggedStackInterpreter) {
     __ subl(rsp, 2 * wordSize);
     __ fstp_d(Address(rsp, 0));
     __ popl(rax);
     __ popl(rdx);
     __ movl(laddress(n), rax);
     __ movl(haddress(n), rdx);
     __ tag_local(frame::TagCategory2, n);
   } else {
     __ fstp_d(daddress(n));
   }
 }
 void TemplateTable::astore(int n) {
   transition(vtos, vtos);
   __ pop_ptr(rax, rdx);
   __ movl(aaddress(n), rax);
   __ tag_local(rdx, n);
 }
 void TemplateTable::pop() {
   transition(vtos, vtos);
   __ addl(rsp, Interpreter::stackElementSize());
 }
 void TemplateTable::pop2() {
   transition(vtos, vtos);
   __ addl(rsp, 2*Interpreter::stackElementSize());
 }
 void TemplateTable::dup() {
   transition(vtos, vtos);
   // stack: ..., a
   __ load_ptr_and_tag(0, rax, rdx);
   __ push_ptr(rax, rdx);
   // stack: ..., a, a
 }
 void TemplateTable::dup_x1() {
   transition(vtos, vtos);
   // stack: ..., a, b
   __ load_ptr_and_tag(0, rax, rdx);  // load b
   __ load_ptr_and_tag(1, rcx, rbx);  // load a
   __ store_ptr_and_tag(1, rax, rdx); // store b
   __ store_ptr_and_tag(0, rcx, rbx); // store a
   __ push_ptr(rax, rdx);             // push b
   // stack: ..., b, a, b
 }
 void TemplateTable::dup_x2() {
   transition(vtos, vtos);
   // stack: ..., a, b, c
   __ load_ptr_and_tag(0, rax, rdx);  // load c
   __ load_ptr_and_tag(2, rcx, rbx);  // load a
   __ store_ptr_and_tag(2, rax, rdx); // store c in a
   __ push_ptr(rax, rdx);             // push c
   // stack: ..., c, b, c, c
   __ load_ptr_and_tag(2, rax, rdx);  // load b
   __ store_ptr_and_tag(2, rcx, rbx); // store a in b
   // stack: ..., c, a, c, c
   __ store_ptr_and_tag(1, rax, rdx); // store b in c
   // stack: ..., c, a, b, c
 }
 void TemplateTable::dup2() {
   transition(vtos, vtos);
   // stack: ..., a, b
   __ load_ptr_and_tag(1, rax, rdx);  // load a
   __ push_ptr(rax, rdx);             // push a
   __ load_ptr_and_tag(1, rax, rdx);  // load b
   __ push_ptr(rax, rdx);             // push b
   // stack: ..., a, b, a, b
 }
 void TemplateTable::dup2_x1() {
   transition(vtos, vtos);
   // stack: ..., a, b, c
   __ load_ptr_and_tag(0, rcx, rbx);  // load c
   __ load_ptr_and_tag(1, rax, rdx);  // load b
   __ push_ptr(rax, rdx);             // push b
   __ push_ptr(rcx, rbx);             // push c
   // stack: ..., a, b, c, b, c
   __ store_ptr_and_tag(3, rcx, rbx); // store c in b
   // stack: ..., a, c, c, b, c
   __ load_ptr_and_tag(4, rcx, rbx);  // load a
   __ store_ptr_and_tag(2, rcx, rbx); // store a in 2nd c
   // stack: ..., a, c, a, b, c
   __ store_ptr_and_tag(4, rax, rdx); // store b in a
   // stack: ..., b, c, a, b, c
   // stack: ..., b, c, a, b, c
 }
 void TemplateTable::dup2_x2() {
   transition(vtos, vtos);
   // stack: ..., a, b, c, d
   __ load_ptr_and_tag(0, rcx, rbx);  // load d
   __ load_ptr_and_tag(1, rax, rdx);  // load c
   __ push_ptr(rax, rdx);             // push c
   __ push_ptr(rcx, rbx);             // push d
   // stack: ..., a, b, c, d, c, d
   __ load_ptr_and_tag(4, rax, rdx);  // load b
   __ store_ptr_and_tag(2, rax, rdx); // store b in d
   __ store_ptr_and_tag(4, rcx, rbx); // store d in b
   // stack: ..., a, d, c, b, c, d
   __ load_ptr_and_tag(5, rcx, rbx);  // load a
   __ load_ptr_and_tag(3, rax, rdx);  // load c
   __ store_ptr_and_tag(3, rcx, rbx); // store a in c
   __ store_ptr_and_tag(5, rax, rdx); // store c in a
   // stack: ..., c, d, a, b, c, d
   // stack: ..., c, d, a, b, c, d
 }
 void TemplateTable::swap() {
   transition(vtos, vtos);
   // stack: ..., a, b
   __ load_ptr_and_tag(1, rcx, rbx);  // load a
   __ load_ptr_and_tag(0, rax, rdx);  // load b
   __ store_ptr_and_tag(0, rcx, rbx); // store a in b
   __ store_ptr_and_tag(1, rax, rdx); // store b in a
   // stack: ..., b, a
 }
 void TemplateTable::iop2(Operation op) {
   transition(itos, itos);
   switch (op) {
     case add  :                    __ pop_i(rdx); __ addl (rax, rdx); break;
     case sub  : __ movl(rdx, rax); __ pop_i(rax); __ subl (rax, rdx); break;
     case mul  :                    __ pop_i(rdx); __ imull(rax, rdx); break;
     case _and :                    __ pop_i(rdx); __ andl (rax, rdx); break;
     case _or  :                    __ pop_i(rdx); __ orl  (rax, rdx); break;
     case _xor :                    __ pop_i(rdx); __ xorl (rax, rdx); break;
     case shl  : __ movl(rcx, rax); __ pop_i(rax); __ shll (rax);      break; // implicit masking of lower 5 bits by Intel shift instr.
     case shr  : __ movl(rcx, rax); __ pop_i(rax); __ sarl (rax);      break; // implicit masking of lower 5 bits by Intel shift instr.
     case ushr : __ movl(rcx, rax); __ pop_i(rax); __ shrl (rax);      break; // implicit masking of lower 5 bits by Intel shift instr.
     default   : ShouldNotReachHere();
   }
 }
 void TemplateTable::lop2(Operation op) {
   transition(ltos, ltos);
   __ pop_l(rbx, rcx);
   switch (op) {
     case add : __ addl(rax, rbx); __ adcl(rdx, rcx); break;
     case sub : __ subl(rbx, rax); __ sbbl(rcx, rdx);
                __ movl(rax, rbx); __ movl(rdx, rcx); break;
     case _and: __ andl(rax, rbx); __ andl(rdx, rcx); break;
     case _or : __ orl (rax, rbx); __ orl (rdx, rcx); break;
     case _xor: __ xorl(rax, rbx); __ xorl(rdx, rcx); break;
     default : ShouldNotReachHere();
   }
 }
 void TemplateTable::idiv() {
   transition(itos, itos);
   __ movl(rcx, rax);
   __ pop_i(rax);
   // Note: could xor rax, and rcx and compare with (-1 ^ min_int). If
   //       they are not equal, one could do a normal division (no correction
   //       needed), which may speed up this implementation for the common case.
   //       (see also JVM spec., p.243 & p.271)
   __ corrected_idivl(rcx);
 }
 void TemplateTable::irem() {
   transition(itos, itos);
   __ movl(rcx, rax);
   __ pop_i(rax);
   // Note: could xor rax, and rcx and compare with (-1 ^ min_int). If
   //       they are not equal, one could do a normal division (no correction
   //       needed), which may speed up this implementation for the common case.
   //       (see also JVM spec., p.243 & p.271)
   __ corrected_idivl(rcx);
   __ movl(rax, rdx);
 }
 void TemplateTable::lmul() {
   transition(ltos, ltos);
   __ pop_l(rbx, rcx);
   __ pushl(rcx); __ pushl(rbx);
   __ pushl(rdx); __ pushl(rax);
   __ lmul(2 * wordSize, 0);
   __ addl(rsp, 4 * wordSize);  // take off temporaries
 }
 void TemplateTable::ldiv() {
   transition(ltos, ltos);
   __ pop_l(rbx, rcx);
   __ pushl(rcx); __ pushl(rbx);
   __ pushl(rdx); __ pushl(rax);
   // check if y = 0
   __ orl(rax, rdx);
   __ jump_cc(Assembler::zero,
              ExternalAddress(Interpreter::_throw_ArithmeticException_entry));
   __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::ldiv));
   __ addl(rsp, 4 * wordSize);  // take off temporaries
 }
 void TemplateTable::lrem() {
   transition(ltos, ltos);
   __ pop_l(rbx, rcx);
   __ pushl(rcx); __ pushl(rbx);
   __ pushl(rdx); __ pushl(rax);
   // check if y = 0
   __ orl(rax, rdx);
   __ jump_cc(Assembler::zero,
              ExternalAddress(Interpreter::_throw_ArithmeticException_entry));
   __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::lrem));
   __ addl(rsp, 4 * wordSize);
 }
 void TemplateTable::lshl() {
   transition(itos, ltos);
   __ movl(rcx, rax);                             // get shift count
   __ pop_l(rax, rdx);                            // get shift value
   __ lshl(rdx, rax);
 }
 void TemplateTable::lshr() {
   transition(itos, ltos);
   __ movl(rcx, rax);                             // get shift count
   __ pop_l(rax, rdx);                            // get shift value
   __ lshr(rdx, rax, true);
 }
 void TemplateTable::lushr() {
   transition(itos, ltos);
   __ movl(rcx, rax);                             // get shift count
   __ pop_l(rax, rdx);                            // get shift value
   __ lshr(rdx, rax);
 }
 void TemplateTable::fop2(Operation op) {
   transition(ftos, ftos);
   __ pop_ftos_to_rsp();  // pop ftos into rsp
   switch (op) {
     case add: __ fadd_s (at_rsp());                break;
     case sub: __ fsubr_s(at_rsp());                break;
     case mul: __ fmul_s (at_rsp());                break;
     case div: __ fdivr_s(at_rsp());                break;
     case rem: __ fld_s  (at_rsp()); __ fremr(rax); break;
     default : ShouldNotReachHere();
   }
   __ f2ieee();
   __ popl(rax);  // pop float thing off
 }
 void TemplateTable::dop2(Operation op) {
   transition(dtos, dtos);
   __ pop_dtos_to_rsp();  // pop dtos into rsp
   switch (op) {
     case add: __ fadd_d (at_rsp());                break;
     case sub: __ fsubr_d(at_rsp());                break;
     case mul: {
       Label L_strict;
       Label L_join;
       const Address access_flags      (rcx, methodOopDesc::access_flags_offset());
       __ get_method(rcx);
       __ movl(rcx, access_flags);
       __ testl(rcx, JVM_ACC_STRICT);
       __ jccb(Assembler::notZero, L_strict);
       __ fmul_d (at_rsp());
       __ jmpb(L_join);
       __ bind(L_strict);
       __ fld_x(ExternalAddress(StubRoutines::addr_fpu_subnormal_bias1()));
       __ fmulp();
       __ fmul_d (at_rsp());
       __ fld_x(ExternalAddress(StubRoutines::addr_fpu_subnormal_bias2()));
       __ fmulp();
       __ bind(L_join);
       break;
     }
     case div: {
       Label L_strict;
       Label L_join;
       const Address access_flags      (rcx, methodOopDesc::access_flags_offset());
       __ get_method(rcx);
       __ movl(rcx, access_flags);
       __ testl(rcx, JVM_ACC_STRICT);
       __ jccb(Assembler::notZero, L_strict);
       __ fdivr_d(at_rsp());
       __ jmp(L_join);
       __ bind(L_strict);
       __ fld_x(ExternalAddress(StubRoutines::addr_fpu_subnormal_bias1()));
       __ fmul_d (at_rsp());
       __ fdivrp();
       __ fld_x(ExternalAddress(StubRoutines::addr_fpu_subnormal_bias2()));
       __ fmulp();
       __ bind(L_join);
       break;
     }
     case rem: __ fld_d  (at_rsp()); __ fremr(rax); break;
     default : ShouldNotReachHere();
   }
   __ d2ieee();
   // Pop double precision number from rsp.
   __ popl(rax);
   __ popl(rdx);
 }
 void TemplateTable::ineg() {
   transition(itos, itos);
   __ negl(rax);
 }
 void TemplateTable::lneg() {
   transition(ltos, ltos);
   __ lneg(rdx, rax);
 }
 void TemplateTable::fneg() {
   transition(ftos, ftos);
   __ fchs();
 }
 void TemplateTable::dneg() {
   transition(dtos, dtos);
   __ fchs();
 }
 void TemplateTable::iinc() {
   transition(vtos, vtos);
   __ load_signed_byte(rdx, at_bcp(2));           // get constant
   locals_index(rbx);
   __ addl(iaddress(rbx), rdx);
 }
 void TemplateTable::wide_iinc() {
   transition(vtos, vtos);
   __ movl(rdx, at_bcp(4));                       // get constant
   locals_index_wide(rbx);
   __ bswap(rdx);                                 // swap bytes & sign-extend constant
   __ sarl(rdx, 16);
   __ addl(iaddress(rbx), rdx);
   // Note: should probably use only one movl to get both
   //       the index and the constant -> fix this
 }
 void TemplateTable::convert() {
   // Checking
 #ifdef ASSERT
   { TosState tos_in  = ilgl;
     TosState tos_out = ilgl;
     switch (bytecode()) {
       case Bytecodes::_i2l: // fall through
       case Bytecodes::_i2f: // fall through
       case Bytecodes::_i2d: // fall through
       case Bytecodes::_i2b: // fall through
       case Bytecodes::_i2c: // fall through
       case Bytecodes::_i2s: tos_in = itos; break;
       case Bytecodes::_l2i: // fall through
       case Bytecodes::_l2f: // fall through
       case Bytecodes::_l2d: tos_in = ltos; break;
       case Bytecodes::_f2i: // fall through
       case Bytecodes::_f2l: // fall through
       case Bytecodes::_f2d: tos_in = ftos; break;
       case Bytecodes::_d2i: // fall through
       case Bytecodes::_d2l: // fall through
       case Bytecodes::_d2f: tos_in = dtos; break;
       default             : ShouldNotReachHere();
     }
     switch (bytecode()) {
       case Bytecodes::_l2i: // fall through
       case Bytecodes::_f2i: // fall through
       case Bytecodes::_d2i: // fall through
       case Bytecodes::_i2b: // fall through
       case Bytecodes::_i2c: // fall through
       case Bytecodes::_i2s: tos_out = itos; break;
       case Bytecodes::_i2l: // fall through
       case Bytecodes::_f2l: // fall through
       case Bytecodes::_d2l: tos_out = ltos; break;
       case Bytecodes::_i2f: // fall through
       case Bytecodes::_l2f: // fall through
       case Bytecodes::_d2f: tos_out = ftos; break;
       case Bytecodes::_i2d: // fall through
       case Bytecodes::_l2d: // fall through
       case Bytecodes::_f2d: tos_out = dtos; break;
       default             : ShouldNotReachHere();
     }
     transition(tos_in, tos_out);
   }
 #endif // ASSERT
   // Conversion
   // (Note: use pushl(rcx)/popl(rcx) for 1/2-word stack-ptr manipulation)
   switch (bytecode()) {
     case Bytecodes::_i2l:
       __ extend_sign(rdx, rax);
       break;
     case Bytecodes::_i2f:
       __ pushl(rax);         // store int on tos
       __ fild_s(at_rsp());   // load int to ST0
       __ f2ieee();           // truncate to float size
       __ popl(rcx);          // adjust rsp
       break;
     case Bytecodes::_i2d:
       __ pushl(rax);         // add one slot for d2ieee()
       __ pushl(rax);         // store int on tos
       __ fild_s(at_rsp());   // load int to ST0
       __ d2ieee();           // truncate to double size
       __ popl(rcx);          // adjust rsp
       __ popl(rcx);
       break;
     case Bytecodes::_i2b:
       __ shll(rax, 24);      // truncate upper 24 bits
       __ sarl(rax, 24);      // and sign-extend byte
       break;
     case Bytecodes::_i2c:
       __ andl(rax, 0xFFFF);  // truncate upper 16 bits
       break;
     case Bytecodes::_i2s:
       __ shll(rax, 16);      // truncate upper 16 bits
       __ sarl(rax, 16);      // and sign-extend short
       break;
     case Bytecodes::_l2i:
       /* nothing to do */
       break;
     case Bytecodes::_l2f:
       __ pushl(rdx);         // store long on tos
       __ pushl(rax);
       __ fild_d(at_rsp());   // load long to ST0
       __ f2ieee();           // truncate to float size
       __ popl(rcx);          // adjust rsp
       __ popl(rcx);
       break;
     case Bytecodes::_l2d:
       __ pushl(rdx);         // store long on tos
       __ pushl(rax);
       __ fild_d(at_rsp());   // load long to ST0
       __ d2ieee();           // truncate to double size
       __ popl(rcx);          // adjust rsp
       __ popl(rcx);
       break;
     case Bytecodes::_f2i:
       __ pushl(rcx);         // reserve space for argument
       __ fstp_s(at_rsp());   // pass float argument on stack
       __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::f2i), 1);
       break;
     case Bytecodes::_f2l:
       __ pushl(rcx);         // reserve space for argument
       __ fstp_s(at_rsp());   // pass float argument on stack
       __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::f2l), 1);
       break;
     case Bytecodes::_f2d:
       /* nothing to do */
       break;
     case Bytecodes::_d2i:
       __ pushl(rcx);         // reserve space for argument
       __ pushl(rcx);
       __ fstp_d(at_rsp());   // pass double argument on stack
       __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::d2i), 2);
       break;
     case Bytecodes::_d2l:
       __ pushl(rcx);         // reserve space for argument
       __ pushl(rcx);
       __ fstp_d(at_rsp());   // pass double argument on stack
       __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::d2l), 2);
       break;
     case Bytecodes::_d2f:
       __ pushl(rcx);         // reserve space for f2ieee()
       __ f2ieee();           // truncate to float size
       __ popl(rcx);          // adjust rsp
       break;
     default             :
       ShouldNotReachHere();
   }
 }
 void TemplateTable::lcmp() {
   transition(ltos, itos);
   // y = rdx:rax
   __ pop_l(rbx, rcx);             // get x = rcx:rbx
   __ lcmp2int(rcx, rbx, rdx, rax);// rcx := cmp(x, y)
   __ movl(rax, rcx);
 }
 void TemplateTable::float_cmp(bool is_float, int unordered_result) {
   if (is_float) {
     __ pop_ftos_to_rsp();
     __ fld_s(at_rsp());
   } else {
     __ pop_dtos_to_rsp();
     __ fld_d(at_rsp());
     __ popl(rdx);
   }
   __ popl(rcx);
   __ fcmp2int(rax, unordered_result < 0);
 }
 void TemplateTable::branch(bool is_jsr, bool is_wide) {
   __ get_method(rcx);           // ECX holds method
   __ profile_taken_branch(rax,rbx); // EAX holds updated MDP, EBX holds bumped taken count
   const ByteSize be_offset = methodOopDesc::backedge_counter_offset() + InvocationCounter::counter_offset();
   const ByteSize inv_offset = methodOopDesc::invocation_counter_offset() + InvocationCounter::counter_offset();
   const int method_offset = frame::interpreter_frame_method_offset * wordSize;
   // Load up EDX with the branch displacement
   __ movl(rdx, at_bcp(1));
   __ bswap(rdx);
   if (!is_wide) __ sarl(rdx, 16);
   // Handle all the JSR stuff here, then exit.
   // It's much shorter and cleaner than intermingling with the
   // non-JSR normal-branch stuff occuring below.
   if (is_jsr) {
     // Pre-load the next target bytecode into EBX
     __ load_unsigned_byte(rbx, Address(rsi, rdx, Address::times_1, 0));
     // compute return address as bci in rax,
     __ leal(rax, at_bcp((is_wide ? 5 : 3) - in_bytes(constMethodOopDesc::codes_offset())));
     __ subl(rax, Address(rcx, methodOopDesc::const_offset()));
     // Adjust the bcp in rsi by the displacement in EDX
     __ addl(rsi, rdx);
     // Push return address
     __ push_i(rax);
     // jsr returns vtos
     __ dispatch_only_noverify(vtos);
     return;
   }
   // Normal (non-jsr) branch handling
   // Adjust the bcp in rsi by the displacement in EDX
   __ addl(rsi, rdx);
   assert(UseLoopCounter || !UseOnStackReplacement, "on-stack-replacement requires loop counters");
   Label backedge_counter_overflow;
   Label profile_method;
   Label dispatch;
   if (UseLoopCounter) {
     // increment backedge counter for backward branches
     // rax,: MDO
     // rbx,: MDO bumped taken-count
     // rcx: method
     // rdx: target offset
     // rsi: target bcp
     // rdi: locals pointer
     __ testl(rdx, rdx);             // check if forward or backward branch
     __ jcc(Assembler::positive, dispatch); // count only if backward branch
     // increment counter
     __ movl(rax, Address(rcx, be_offset));        // load backedge counter
     __ increment(rax, InvocationCounter::count_increment); // increment counter
     __ movl(Address(rcx, be_offset), rax);        // store counter
     __ movl(rax, Address(rcx, inv_offset));    // load invocation counter
     __ andl(rax, InvocationCounter::count_mask_value);     // and the status bits
     __ addl(rax, Address(rcx, be_offset));        // add both counters
     if (ProfileInterpreter) {
       // Test to see if we should create a method data oop
       __ cmp32(rax,
                ExternalAddress((address) &InvocationCounter::InterpreterProfileLimit));
       __ jcc(Assembler::less, dispatch);
       // if no method data exists, go to profile method
       __ test_method_data_pointer(rax, profile_method);
       if (UseOnStackReplacement) {
         // check for overflow against rbx, which is the MDO taken count
         __ cmp32(rbx,
                  ExternalAddress((address) &InvocationCounter::InterpreterBackwardBranchLimit));
         __ jcc(Assembler::below, dispatch);
         // When ProfileInterpreter is on, the backedge_count comes from the
         // methodDataOop, which value does not get reset on the call to
         // frequency_counter_overflow().  To avoid excessive calls to the overflow
         // routine while the method is being compiled, add a second test to make
         // sure the overflow function is called only once every overflow_frequency.
         const int overflow_frequency = 1024;
         __ andl(rbx, overflow_frequency-1);
         __ jcc(Assembler::zero, backedge_counter_overflow);
       }
     } else {
       if (UseOnStackReplacement) {
         // check for overflow against rax, which is the sum of the counters
         __ cmp32(rax,
                  ExternalAddress((address) &InvocationCounter::InterpreterBackwardBranchLimit));
         __ jcc(Assembler::aboveEqual, backedge_counter_overflow);
       }
     }
     __ bind(dispatch);
   }
   // Pre-load the next target bytecode into EBX
   __ load_unsigned_byte(rbx, Address(rsi, 0));
   // continue with the bytecode @ target
   // rax,: return bci for jsr's, unused otherwise
   // rbx,: target bytecode
   // rsi: target bcp
   __ dispatch_only(vtos);
   if (UseLoopCounter) {
     if (ProfileInterpreter) {
       // Out-of-line code to allocate method data oop.
       __ bind(profile_method);
       __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::profile_method), rsi);
       __ load_unsigned_byte(rbx, Address(rsi, 0));  // restore target bytecode
       __ movl(rcx, Address(rbp, method_offset));
       __ movl(rcx, Address(rcx, in_bytes(methodOopDesc::method_data_offset())));
       __ movl(Address(rbp, frame::interpreter_frame_mdx_offset * wordSize), rcx);
       __ test_method_data_pointer(rcx, dispatch);
       // offset non-null mdp by MDO::data_offset() + IR::profile_method()
       __ addl(rcx, in_bytes(methodDataOopDesc::data_offset()));
       __ addl(rcx, rax);
       __ movl(Address(rbp, frame::interpreter_frame_mdx_offset * wordSize), rcx);
       __ jmp(dispatch);
     }
     if (UseOnStackReplacement) {
       // invocation counter overflow
       __ bind(backedge_counter_overflow);
       __ negl(rdx);
       __ addl(rdx, rsi);        // branch bcp
       call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::frequency_counter_overflow), rdx);
       __ load_unsigned_byte(rbx, Address(rsi, 0));  // restore target bytecode
       // rax,: osr nmethod (osr ok) or NULL (osr not possible)
       // rbx,: target bytecode
       // rdx: scratch
       // rdi: locals pointer
       // rsi: bcp
       __ testl(rax, rax);                        // test result
       __ jcc(Assembler::zero, dispatch);         // no osr if null
       // nmethod may have been invalidated (VM may block upon call_VM return)
       __ movl(rcx, Address(rax, nmethod::entry_bci_offset()));
       __ cmpl(rcx, InvalidOSREntryBci);
       __ jcc(Assembler::equal, dispatch);
       // We have the address of an on stack replacement routine in rax,
       // We need to prepare to execute the OSR method. First we must
       // migrate the locals and monitors off of the stack.
       __ movl(rbx, rax);                             // save the nmethod
       const Register thread = rcx;
       __ get_thread(thread);
       call_VM(noreg, CAST_FROM_FN_PTR(address, SharedRuntime::OSR_migration_begin));
       // rax, is OSR buffer, move it to expected parameter location
       __ movl(rcx, rax);
       // pop the interpreter frame
       __ movl(rdx, Address(rbp, frame::interpreter_frame_sender_sp_offset * wordSize)); // get sender sp
       __ leave();                                // remove frame anchor
       __ popl(rdi);                              // get return address
       __ movl(rsp, rdx);                         // set sp to sender sp
       Label skip;
       Label chkint;
       // The interpreter frame we have removed may be returning to
       // either the callstub or the interpreter. Since we will
       // now be returning from a compiled (OSR) nmethod we must
       // adjust the return to the return were it can handler compiled
       // results and clean the fpu stack. This is very similar to
       // what a i2c adapter must do.
       // Are we returning to the call stub?
       __ cmp32(rdi, ExternalAddress(StubRoutines::_call_stub_return_address));
       __ jcc(Assembler::notEqual, chkint);
       // yes adjust to the specialized call stub  return.
       assert(StubRoutines::i486::get_call_stub_compiled_return() != NULL, "must be set");
       __ lea(rdi, ExternalAddress(StubRoutines::i486::get_call_stub_compiled_return()));
       __ jmp(skip);
       __ bind(chkint);
       // Are we returning to the interpreter? Look for sentinel
       __ cmpl(Address(rdi, -8), Interpreter::return_sentinel);
       __ jcc(Assembler::notEqual, skip);
       // Adjust to compiled return back to interpreter
       __ movl(rdi, Address(rdi, -4));
       __ bind(skip);
       // Align stack pointer for compiled code (note that caller is
       // responsible for undoing this fixup by remembering the old SP
       // in an rbp,-relative location)
       __ andl(rsp, -(StackAlignmentInBytes));
       // push the (possibly adjusted) return address
       __ pushl(rdi);
       // and begin the OSR nmethod
       __ jmp(Address(rbx, nmethod::osr_entry_point_offset()));
     }
   }
 }
 void TemplateTable::if_0cmp(Condition cc) {
   transition(itos, vtos);
   // assume branch is more often taken than not (loops use backward branches)
   Label not_taken;
   __ testl(rax, rax);
   __ jcc(j_not(cc), not_taken);
   branch(false, false);
   __ bind(not_taken);
   __ profile_not_taken_branch(rax);
 }
 void TemplateTable::if_icmp(Condition cc) {
   transition(itos, vtos);
   // assume branch is more often taken than not (loops use backward branches)
   Label not_taken;
   __ pop_i(rdx);
   __ cmpl(rdx, rax);
   __ jcc(j_not(cc), not_taken);
   branch(false, false);
   __ bind(not_taken);
   __ profile_not_taken_branch(rax);
 }
 void TemplateTable::if_nullcmp(Condition cc) {
   transition(atos, vtos);
   // assume branch is more often taken than not (loops use backward branches)
   Label not_taken;
   __ testl(rax, rax);
   __ jcc(j_not(cc), not_taken);
   branch(false, false);
   __ bind(not_taken);
   __ profile_not_taken_branch(rax);
 }
 void TemplateTable::if_acmp(Condition cc) {
   transition(atos, vtos);
   // assume branch is more often taken than not (loops use backward branches)
   Label not_taken;
   __ pop_ptr(rdx);
   __ cmpl(rdx, rax);
   __ jcc(j_not(cc), not_taken);
   branch(false, false);
   __ bind(not_taken);
   __ profile_not_taken_branch(rax);
 }
 void TemplateTable::ret() {
   transition(vtos, vtos);
   locals_index(rbx);
   __ movl(rbx, iaddress(rbx));                   // get return bci, compute return bcp
   __ profile_ret(rbx, rcx);
   __ get_method(rax);
   __ movl(rsi, Address(rax, methodOopDesc::const_offset()));
   __ leal(rsi, Address(rsi, rbx, Address::times_1,
                        constMethodOopDesc::codes_offset()));
   __ dispatch_next(vtos);
 }
 void TemplateTable::wide_ret() {
   transition(vtos, vtos);
   locals_index_wide(rbx);
   __ movl(rbx, iaddress(rbx));                   // get return bci, compute return bcp
   __ profile_ret(rbx, rcx);
   __ get_method(rax);
   __ movl(rsi, Address(rax, methodOopDesc::const_offset()));
   __ leal(rsi, Address(rsi, rbx, Address::times_1, constMethodOopDesc::codes_offset()));
   __ dispatch_next(vtos);
 }
 void TemplateTable::tableswitch() {
   Label default_case, continue_execution;
   transition(itos, vtos);
   // align rsi
   __ leal(rbx, at_bcp(wordSize));
   __ andl(rbx, -wordSize);
   // load lo & hi
   __ movl(rcx, Address(rbx, 1 * wordSize));
   __ movl(rdx, Address(rbx, 2 * wordSize));
   __ bswap(rcx);
   __ bswap(rdx);
   // check against lo & hi
   __ cmpl(rax, rcx);
   __ jccb(Assembler::less, default_case);
   __ cmpl(rax, rdx);
   __ jccb(Assembler::greater, default_case);
   // lookup dispatch offset
   __ subl(rax, rcx);
   __ movl(rdx, Address(rbx, rax, Address::times_4, 3 * wordSize));
   __ profile_switch_case(rax, rbx, rcx);
   // continue execution
   __ bind(continue_execution);
   __ bswap(rdx);
   __ load_unsigned_byte(rbx, Address(rsi, rdx, Address::times_1));
   __ addl(rsi, rdx);
   __ dispatch_only(vtos);
   // handle default
   __ bind(default_case);
   __ profile_switch_default(rax);
   __ movl(rdx, Address(rbx, 0));
   __ jmp(continue_execution);
 }
 void TemplateTable::lookupswitch() {
   transition(itos, itos);
   __ stop("lookupswitch bytecode should have been rewritten");
 }
 void TemplateTable::fast_linearswitch() {
   transition(itos, vtos);
   Label loop_entry, loop, found, continue_execution;
   // bswap rax, so we can avoid bswapping the table entries
   __ bswap(rax);
   // align rsi
   __ leal(rbx, at_bcp(wordSize));                // btw: should be able to get rid of this instruction (change offsets below)
   __ andl(rbx, -wordSize);
   // set counter
   __ movl(rcx, Address(rbx, wordSize));
   __ bswap(rcx);
   __ jmpb(loop_entry);
   // table search
   __ bind(loop);
   __ cmpl(rax, Address(rbx, rcx, Address::times_8, 2 * wordSize));
   __ jccb(Assembler::equal, found);
   __ bind(loop_entry);
   __ decrement(rcx);
   __ jcc(Assembler::greaterEqual, loop);
   // default case
   __ profile_switch_default(rax);
   __ movl(rdx, Address(rbx, 0));
   __ jmpb(continue_execution);
   // entry found -> get offset
   __ bind(found);
   __ movl(rdx, Address(rbx, rcx, Address::times_8, 3 * wordSize));
   __ profile_switch_case(rcx, rax, rbx);
   // continue execution
   __ bind(continue_execution);
   __ bswap(rdx);
   __ load_unsigned_byte(rbx, Address(rsi, rdx, Address::times_1));
   __ addl(rsi, rdx);
   __ dispatch_only(vtos);
 }
 void TemplateTable::fast_binaryswitch() {
   transition(itos, vtos);
   // Implementation using the following core algorithm:
   //
   // int binary_search(int key, LookupswitchPair* array, int n) {
   //   // Binary search according to "Methodik des Programmierens" by
   //   // Edsger W. Dijkstra and W.H.J. Feijen, Addison Wesley Germany 1985.
   //   int i = 0;
   //   int j = n;
   //   while (i+1 < j) {
   //     // invariant P: 0 <= i < j <= n and (a[i] <= key < a[j] or Q)
   //     // with      Q: for all i: 0 <= i < n: key < a[i]
   //     // where a stands for the array and assuming that the (inexisting)
   //     // element a[n] is infinitely big.
   //     int h = (i + j) >> 1;
   //     // i < h < j
   //     if (key < array[h].fast_match()) {
   //       j = h;
   //     } else {
   //       i = h;
   //     }
   //   }
   //   // R: a[i] <= key < a[i+1] or Q
   //   // (i.e., if key is within array, i is the correct index)
   //   return i;
   // }
   // register allocation
   const Register key   = rax;                    // already set (tosca)
   const Register array = rbx;
   const Register i     = rcx;
   const Register j     = rdx;
   const Register h     = rdi;                    // needs to be restored
   const Register temp  = rsi;
   // setup array
   __ save_bcp();
   __ leal(array, at_bcp(3*wordSize));            // btw: should be able to get rid of this instruction (change offsets below)
   __ andl(array, -wordSize);
   // initialize i & j
   __ xorl(i, i);                                 // i = 0;
   __ movl(j, Address(array, -wordSize));         // j = length(array);
   // Convert j into native byteordering
   __ bswap(j);
   // and start
   Label entry;
   __ jmp(entry);
   // binary search loop
   { Label loop;
     __ bind(loop);
     // int h = (i + j) >> 1;
     __ leal(h, Address(i, j, Address::times_1)); // h = i + j;
     __ sarl(h, 1);                               // h = (i + j) >> 1;
     // if (key < array[h].fast_match()) {
     //   j = h;
     // } else {
     //   i = h;
     // }
     // Convert array[h].match to native byte-ordering before compare
     __ movl(temp, Address(array, h, Address::times_8, 0*wordSize));
     __ bswap(temp);
     __ cmpl(key, temp);
     if (VM_Version::supports_cmov()) {
       __ cmovl(Assembler::less        , j, h);   // j = h if (key <  array[h].fast_match())
       __ cmovl(Assembler::greaterEqual, i, h);   // i = h if (key >= array[h].fast_match())
     } else {
       Label set_i, end_of_if;
       __ jccb(Assembler::greaterEqual, set_i);    // {
       __ movl(j, h);                             //   j = h;
       __ jmp(end_of_if);                         // }
       __ bind(set_i);                            // else {
       __ movl(i, h);                             //   i = h;
       __ bind(end_of_if);                        // }
     }
     // while (i+1 < j)
     __ bind(entry);
     __ leal(h, Address(i, 1));                   // i+1
     __ cmpl(h, j);                               // i+1 < j
     __ jcc(Assembler::less, loop);
   }
   // end of binary search, result index is i (must check again!)
   Label default_case;
   // Convert array[i].match to native byte-ordering before compare
   __ movl(temp, Address(array, i, Address::times_8, 0*wordSize));
   __ bswap(temp);
   __ cmpl(key, temp);
   __ jcc(Assembler::notEqual, default_case);
   // entry found -> j = offset
   __ movl(j , Address(array, i, Address::times_8, 1*wordSize));
   __ profile_switch_case(i, key, array);
   __ bswap(j);
   __ restore_bcp();
   __ restore_locals();                           // restore rdi
   __ load_unsigned_byte(rbx, Address(rsi, j, Address::times_1));
   __ addl(rsi, j);
   __ dispatch_only(vtos);
   // default case -> j = default offset
   __ bind(default_case);
   __ profile_switch_default(i);
   __ movl(j, Address(array, -2*wordSize));
   __ bswap(j);
   __ restore_bcp();
   __ restore_locals();                           // restore rdi
   __ load_unsigned_byte(rbx, Address(rsi, j, Address::times_1));
   __ addl(rsi, j);
   __ dispatch_only(vtos);
 }
 void TemplateTable::_return(TosState state) {
   transition(state, state);
   assert(_desc->calls_vm(), "inconsistent calls_vm information"); // call in remove_activation
   if (_desc->bytecode() == Bytecodes::_return_register_finalizer) {
     assert(state == vtos, "only valid state");
     __ movl(rax, aaddress(0));
     __ movl(rdi, Address(rax, oopDesc::klass_offset_in_bytes()));
     __ movl(rdi, Address(rdi, Klass::access_flags_offset_in_bytes() + sizeof(oopDesc)));
     __ testl(rdi, JVM_ACC_HAS_FINALIZER);
     Label skip_register_finalizer;
     __ jcc(Assembler::zero, skip_register_finalizer);
     __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::register_finalizer), rax);
     __ bind(skip_register_finalizer);
   }
   __ remove_activation(state, rsi);
   __ jmp(rsi);
 }
 // ----------------------------------------------------------------------------
 // Volatile variables demand their effects be made known to all CPU's in
 // order.  Store buffers on most chips allow reads & writes to reorder; the
 // JMM's ReadAfterWrite.java test fails in -Xint mode without some kind of
 // memory barrier (i.e., it's not sufficient that the interpreter does not
 // reorder volatile references, the hardware also must not reorder them).
 //
 // According to the new Java Memory Model (JMM):
 // (1) All volatiles are serialized wrt to each other.
 // ALSO reads & writes act as aquire & release, so:
 // (2) A read cannot let unrelated NON-volatile memory refs that happen after
 // the read float up to before the read.  It's OK for non-volatile memory refs
 // that happen before the volatile read to float down below it.
 // (3) Similar a volatile write cannot let unrelated NON-volatile memory refs
 // that happen BEFORE the write float down to after the write.  It's OK for
 // non-volatile memory refs that happen after the volatile write to float up
 // before it.
 //
 // We only put in barriers around volatile refs (they are expensive), not
 // _between_ memory refs (that would require us to track the flavor of the
 // previous memory refs).  Requirements (2) and (3) require some barriers
 // before volatile stores and after volatile loads.  These nearly cover
 // requirement (1) but miss the volatile-store-volatile-load case.  This final
 // case is placed after volatile-stores although it could just as well go
 // before volatile-loads.
 void TemplateTable::volatile_barrier( ) {
   // Helper function to insert a is-volatile test and memory barrier
   if( !os::is_MP() ) return;    // Not needed on single CPU
   __ membar();
 }
 void TemplateTable::resolve_cache_and_index(int byte_no, Register Rcache, Register index) {
   assert(byte_no == 1 || byte_no == 2, "byte_no out of range");
   Register temp = rbx;
   assert_different_registers(Rcache, index, temp);
   const int shift_count = (1 + byte_no)*BitsPerByte;
   Label resolved;
   __ get_cache_and_index_at_bcp(Rcache, index, 1);
   __ movl(temp, Address(Rcache, index, Address::times_4, constantPoolCacheOopDesc::base_offset() + ConstantPoolCacheEntry::indices_offset()));
   __ shrl(temp, shift_count);
   // have we resolved this bytecode?
   __ andl(temp, 0xFF);
   __ cmpl(temp, (int)bytecode());
   __ jcc(Assembler::equal, resolved);
   // resolve first time through
   address entry;
   switch (bytecode()) {
     case Bytecodes::_getstatic      : // fall through
     case Bytecodes::_putstatic      : // fall through
     case Bytecodes::_getfield       : // fall through
     case Bytecodes::_putfield       : entry = CAST_FROM_FN_PTR(address, InterpreterRuntime::resolve_get_put); break;
     case Bytecodes::_invokevirtual  : // fall through
     case Bytecodes::_invokespecial  : // fall through
     case Bytecodes::_invokestatic   : // fall through
     case Bytecodes::_invokeinterface: entry = CAST_FROM_FN_PTR(address, InterpreterRuntime::resolve_invoke);  break;
     default                         : ShouldNotReachHere();                                 break;
   }
   __ movl(temp, (int)bytecode());
   __ call_VM(noreg, entry, temp);
   // Update registers with resolved info
   __ get_cache_and_index_at_bcp(Rcache, index, 1);
   __ bind(resolved);
 }
 // The cache and index registers must be set before call
 void TemplateTable::load_field_cp_cache_entry(Register obj,
                                               Register cache,
                                               Register index,
                                               Register off,
                                               Register flags,
                                               bool is_static = false) {
   assert_different_registers(cache, index, flags, off);
   ByteSize cp_base_offset = constantPoolCacheOopDesc::base_offset();
   // Field offset
   __ movl(off, Address(cache, index, Address::times_4,
            in_bytes(cp_base_offset + ConstantPoolCacheEntry::f2_offset())));
   // Flags
   __ movl(flags, Address(cache, index, Address::times_4,
            in_bytes(cp_base_offset + ConstantPoolCacheEntry::flags_offset())));
   // klass     overwrite register
   if (is_static) {
     __ movl(obj, Address(cache, index, Address::times_4,
              in_bytes(cp_base_offset + ConstantPoolCacheEntry::f1_offset())));
   }
 }
 void TemplateTable::load_invoke_cp_cache_entry(int byte_no,
                                                Register method,
                                                Register itable_index,
                                                Register flags,
                                                bool is_invokevirtual,
                                                bool is_invokevfinal /*unused*/) {
   // setup registers
   const Register cache = rcx;
   const Register index = rdx;
   assert_different_registers(method, flags);
   assert_different_registers(method, cache, index);
   assert_different_registers(itable_index, flags);
   assert_different_registers(itable_index, cache, index);
   // determine constant pool cache field offsets
   const int method_offset = in_bytes(
     constantPoolCacheOopDesc::base_offset() +
       (is_invokevirtual
        ? ConstantPoolCacheEntry::f2_offset()
        : ConstantPoolCacheEntry::f1_offset()
       )
     );
   const int flags_offset = in_bytes(constantPoolCacheOopDesc::base_offset() +
                                     ConstantPoolCacheEntry::flags_offset());
   // access constant pool cache fields
   const int index_offset = in_bytes(constantPoolCacheOopDesc::base_offset() +
                                     ConstantPoolCacheEntry::f2_offset());
   resolve_cache_and_index(byte_no, cache, index);
   assert(wordSize == 4, "adjust code below");
   __ movl(method, Address(cache, index, Address::times_4, method_offset));
   if (itable_index != noreg) {
     __ movl(itable_index, Address(cache, index, Address::times_4, index_offset));
   }
   __ movl(flags , Address(cache, index, Address::times_4, flags_offset ));
 }
 // The registers cache and index expected to be set before call.
 // Correct values of the cache and index registers are preserved.
 void TemplateTable::jvmti_post_field_access(Register cache,
                                             Register index,
                                             bool is_static,
                                             bool has_tos) {
   if (JvmtiExport::can_post_field_access()) {
     // Check to see if a field access watch has been set before we take
     // the time to call into the VM.
     Label L1;
     assert_different_registers(cache, index, rax);
     __ mov32(rax, ExternalAddress((address) JvmtiExport::get_field_access_count_addr()));
     __ testl(rax,rax);
     __ jcc(Assembler::zero, L1);
     // cache entry pointer
     __ addl(cache, in_bytes(constantPoolCacheOopDesc::base_offset()));
     __ shll(index, LogBytesPerWord);
     __ addl(cache, index);
     if (is_static) {
       __ movl(rax, 0);      // NULL object reference
     } else {
       __ pop(atos);         // Get the object
       __ verify_oop(rax);
       __ push(atos);        // Restore stack state
     }
     // rax,:   object pointer or NULL
     // cache: cache entry pointer
     __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::post_field_access),
                rax, cache);
     __ get_cache_and_index_at_bcp(cache, index, 1);
     __ bind(L1);
   }
 }
 void TemplateTable::pop_and_check_object(Register r) {
   __ pop_ptr(r);
   __ null_check(r);  // for field access must check obj.
   __ verify_oop(r);
 }
 void TemplateTable::getfield_or_static(int byte_no, bool is_static) {
   transition(vtos, vtos);
   const Register cache = rcx;
   const Register index = rdx;
   const Register obj   = rcx;
   const Register off   = rbx;
   const Register flags = rax;
   resolve_cache_and_index(byte_no, cache, index);
   jvmti_post_field_access(cache, index, is_static, false);
   load_field_cp_cache_entry(obj, cache, index, off, flags, is_static);
   if (!is_static) pop_and_check_object(obj);
   const Address lo(obj, off, Address::times_1, 0*wordSize);
   const Address hi(obj, off, Address::times_1, 1*wordSize);
   Label Done, notByte, notInt, notShort, notChar, notLong, notFloat, notObj, notDouble;
   __ shrl(flags, ConstantPoolCacheEntry::tosBits);
   assert(btos == 0, "change code, btos != 0");
   // btos
   __ andl(flags, 0x0f);
   __ jcc(Assembler::notZero, notByte);
   __ load_signed_byte(rax, lo );
   __ push(btos);
   // Rewrite bytecode to be faster
   if (!is_static) {
     patch_bytecode(Bytecodes::_fast_bgetfield, rcx, rbx);
   }
   __ jmp(Done);
   __ bind(notByte);
   // itos
   __ cmpl(flags, itos );
   __ jcc(Assembler::notEqual, notInt);
   __ movl(rax, lo );
   __ push(itos);
   // Rewrite bytecode to be faster
   if (!is_static) {
     patch_bytecode(Bytecodes::_fast_igetfield, rcx, rbx);
   }
   __ jmp(Done);
   __ bind(notInt);
   // atos
   __ cmpl(flags, atos );
   __ jcc(Assembler::notEqual, notObj);
   __ movl(rax, lo );
   __ push(atos);
   if (!is_static) {
     patch_bytecode(Bytecodes::_fast_agetfield, rcx, rbx);
   }
   __ jmp(Done);
   __ bind(notObj);
   // ctos
   __ cmpl(flags, ctos );
   __ jcc(Assembler::notEqual, notChar);
   __ load_unsigned_word(rax, lo );
   __ push(ctos);
   if (!is_static) {
     patch_bytecode(Bytecodes::_fast_cgetfield, rcx, rbx);
   }
   __ jmp(Done);
   __ bind(notChar);
   // stos
   __ cmpl(flags, stos );
   __ jcc(Assembler::notEqual, notShort);
   __ load_signed_word(rax, lo );
   __ push(stos);
   if (!is_static) {
     patch_bytecode(Bytecodes::_fast_sgetfield, rcx, rbx);
   }
   __ jmp(Done);
   __ bind(notShort);
   // ltos
   __ cmpl(flags, ltos );
   __ jcc(Assembler::notEqual, notLong);
   // Generate code as if volatile.  There just aren't enough registers to
   // save that information and this code is faster than the test.
   __ fild_d(lo);                // Must load atomically
   __ subl(rsp,2*wordSize);      // Make space for store
   __ fistp_d(Address(rsp,0));
   __ popl(rax);
   __ popl(rdx);
   __ push(ltos);
   // Don't rewrite to _fast_lgetfield for potential volatile case.
   __ jmp(Done);
   __ bind(notLong);
   // ftos
   __ cmpl(flags, ftos );
   __ jcc(Assembler::notEqual, notFloat);
   __ fld_s(lo);
   __ push(ftos);
   if (!is_static) {
     patch_bytecode(Bytecodes::_fast_fgetfield, rcx, rbx);
   }
   __ jmp(Done);
   __ bind(notFloat);
   // dtos
   __ cmpl(flags, dtos );
   __ jcc(Assembler::notEqual, notDouble);
   __ fld_d(lo);
   __ push(dtos);
   if (!is_static) {
     patch_bytecode(Bytecodes::_fast_dgetfield, rcx, rbx);
   }
   __ jmpb(Done);
   __ bind(notDouble);
   __ stop("Bad state");
   __ bind(Done);
   // Doug Lea believes this is not needed with current Sparcs (TSO) and Intel (PSO).
   // volatile_barrier( );
 }
 void TemplateTable::getfield(int byte_no) {
   getfield_or_static(byte_no, false);
 }
 void TemplateTable::getstatic(int byte_no) {
   getfield_or_static(byte_no, true);
 }
 // The registers cache and index expected to be set before call.
 // The function may destroy various registers, just not the cache and index registers.
 void TemplateTable::jvmti_post_field_mod(Register cache, Register index, bool is_static) {
   ByteSize cp_base_offset = constantPoolCacheOopDesc::base_offset();
   if (JvmtiExport::can_post_field_modification()) {
     // Check to see if a field modification watch has been set before we take
     // the time to call into the VM.
     Label L1;
     assert_different_registers(cache, index, rax);
     __ mov32(rax, ExternalAddress((address)JvmtiExport::get_field_modification_count_addr()));
     __ testl(rax, rax);
     __ jcc(Assembler::zero, L1);
     // The cache and index registers have been already set.
     // This allows to eliminate this call but the cache and index
     // registers have to be correspondingly used after this line.
     __ get_cache_and_index_at_bcp(rax, rdx, 1);
     if (is_static) {
       // Life is simple.  Null out the object pointer.
       __ xorl(rbx, rbx);
     } else {
       // Life is harder. The stack holds the value on top, followed by the object.
       // We don't know the size of the value, though; it could be one or two words
       // depending on its type. As a result, we must find the type to determine where
       // the object is.
       Label two_word, valsize_known;
       __ movl(rcx, Address(rax, rdx, Address::times_4, in_bytes(cp_base_offset +
                                    ConstantPoolCacheEntry::flags_offset())));
       __ movl(rbx, rsp);
       __ shrl(rcx, ConstantPoolCacheEntry::tosBits);
       // Make sure we don't need to mask rcx for tosBits after the above shift
       ConstantPoolCacheEntry::verify_tosBits();
       __ cmpl(rcx, ltos);
       __ jccb(Assembler::equal, two_word);
       __ cmpl(rcx, dtos);
       __ jccb(Assembler::equal, two_word);
       __ addl(rbx, Interpreter::expr_offset_in_bytes(1)); // one word jvalue (not ltos, dtos)
       __ jmpb(valsize_known);
       __ bind(two_word);
       __ addl(rbx, Interpreter::expr_offset_in_bytes(2)); // two words jvalue
       __ bind(valsize_known);
       // setup object pointer
       __ movl(rbx, Address(rbx, 0));
     }
     // cache entry pointer
     __ addl(rax, in_bytes(cp_base_offset));
     __ shll(rdx, LogBytesPerWord);
     __ addl(rax, rdx);
     // object (tos)
     __ movl(rcx, rsp);
     // rbx,: object pointer set up above (NULL if static)
     // rax,: cache entry pointer
     // rcx: jvalue object on the stack
     __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::post_field_modification),
                rbx, rax, rcx);
     __ get_cache_and_index_at_bcp(cache, index, 1);
     __ bind(L1);
   }
 }
 void TemplateTable::putfield_or_static(int byte_no, bool is_static) {
   transition(vtos, vtos);
   const Register cache = rcx;
   const Register index = rdx;
   const Register obj   = rcx;
   const Register off   = rbx;
   const Register flags = rax;
   resolve_cache_and_index(byte_no, cache, index);
   jvmti_post_field_mod(cache, index, is_static);
   load_field_cp_cache_entry(obj, cache, index, off, flags, is_static);
   // Doug Lea believes this is not needed with current Sparcs (TSO) and Intel (PSO).
   // volatile_barrier( );
   Label notVolatile, Done;
   __ movl(rdx, flags);
   __ shrl(rdx, ConstantPoolCacheEntry::volatileField);
   __ andl(rdx, 0x1);
   // field addresses
   const Address lo(obj, off, Address::times_1, 0*wordSize);
   const Address hi(obj, off, Address::times_1, 1*wordSize);
   Label notByte, notInt, notShort, notChar, notLong, notFloat, notObj, notDouble;
   __ shrl(flags, ConstantPoolCacheEntry::tosBits);
   assert(btos == 0, "change code, btos != 0");
   // btos
   __ andl(flags, 0x0f);
   __ jcc(Assembler::notZero, notByte);
   __ pop(btos);
   if (!is_static) pop_and_check_object(obj);
   __ movb(lo, rax );
   if (!is_static) {
     patch_bytecode(Bytecodes::_fast_bputfield, rcx, rbx);
   }
   __ jmp(Done);
   __ bind(notByte);
   // itos
   __ cmpl(flags, itos );
   __ jcc(Assembler::notEqual, notInt);
   __ pop(itos);
   if (!is_static) pop_and_check_object(obj);
   __ movl(lo, rax );
   if (!is_static) {
     patch_bytecode(Bytecodes::_fast_iputfield, rcx, rbx);
   }
   __ jmp(Done);
   __ bind(notInt);
   // atos
   __ cmpl(flags, atos );
   __ jcc(Assembler::notEqual, notObj);
   __ pop(atos);
   if (!is_static) pop_and_check_object(obj);
   do_oop_store(_masm, lo, rax, _bs->kind(), false);
   if (!is_static) {
     patch_bytecode(Bytecodes::_fast_aputfield, rcx, rbx);
   }
   __ jmp(Done);
   __ bind(notObj);
   // ctos
   __ cmpl(flags, ctos );
   __ jcc(Assembler::notEqual, notChar);
   __ pop(ctos);
   if (!is_static) pop_and_check_object(obj);
   __ movw(lo, rax );
   if (!is_static) {
     patch_bytecode(Bytecodes::_fast_cputfield, rcx, rbx);
   }
   __ jmp(Done);
   __ bind(notChar);
   // stos
   __ cmpl(flags, stos );
   __ jcc(Assembler::notEqual, notShort);
   __ pop(stos);
   if (!is_static) pop_and_check_object(obj);
   __ movw(lo, rax );
   if (!is_static) {
     patch_bytecode(Bytecodes::_fast_sputfield, rcx, rbx);
   }
   __ jmp(Done);
   __ bind(notShort);
   // ltos
   __ cmpl(flags, ltos );
   __ jcc(Assembler::notEqual, notLong);
   Label notVolatileLong;
   __ testl(rdx, rdx);
   __ jcc(Assembler::zero, notVolatileLong);
   __ pop(ltos);  // overwrites rdx, do this after testing volatile.
   if (!is_static) pop_and_check_object(obj);
   // Replace with real volatile test
   __ pushl(rdx);
   __ pushl(rax);                // Must update atomically with FIST
   __ fild_d(Address(rsp,0));    // So load into FPU register
   __ fistp_d(lo);               // and put into memory atomically
   __ addl(rsp,2*wordSize);
   volatile_barrier();
   // Don't rewrite volatile version
   __ jmp(notVolatile);
   __ bind(notVolatileLong);
   __ pop(ltos);  // overwrites rdx
   if (!is_static) pop_and_check_object(obj);
   __ movl(hi, rdx);
   __ movl(lo, rax);
   if (!is_static) {
     patch_bytecode(Bytecodes::_fast_lputfield, rcx, rbx);
   }
   __ jmp(notVolatile);
   __ bind(notLong);
   // ftos
   __ cmpl(flags, ftos );
   __ jcc(Assembler::notEqual, notFloat);
   __ pop(ftos);
   if (!is_static) pop_and_check_object(obj);
   __ fstp_s(lo);
   if (!is_static) {
     patch_bytecode(Bytecodes::_fast_fputfield, rcx, rbx);
   }
   __ jmp(Done);
   __ bind(notFloat);
   // dtos
   __ cmpl(flags, dtos );
   __ jcc(Assembler::notEqual, notDouble);
   __ pop(dtos);
   if (!is_static) pop_and_check_object(obj);
   __ fstp_d(lo);
   if (!is_static) {
     patch_bytecode(Bytecodes::_fast_dputfield, rcx, rbx);
   }
   __ jmp(Done);
   __ bind(notDouble);
   __ stop("Bad state");
   __ bind(Done);
   // Check for volatile store
   __ testl(rdx, rdx);
   __ jcc(Assembler::zero, notVolatile);
   volatile_barrier( );
   __ bind(notVolatile);
 }
 void TemplateTable::putfield(int byte_no) {
   putfield_or_static(byte_no, false);
 }
 void TemplateTable::putstatic(int byte_no) {
   putfield_or_static(byte_no, true);
 }
 void TemplateTable::jvmti_post_fast_field_mod() {
   if (JvmtiExport::can_post_field_modification()) {
     // Check to see if a field modification watch has been set before we take
     // the time to call into the VM.
     Label L2;
     __ mov32(rcx, ExternalAddress((address)JvmtiExport::get_field_modification_count_addr()));
     __ testl(rcx,rcx);
     __ jcc(Assembler::zero, L2);
     __ pop_ptr(rbx);               // copy the object pointer from tos
     __ verify_oop(rbx);
     __ push_ptr(rbx);              // put the object pointer back on tos
     __ subl(rsp, sizeof(jvalue));  // add space for a jvalue object
     __ movl(rcx, rsp);
     __ push_ptr(rbx);                 // save object pointer so we can steal rbx,
     __ movl(rbx, 0);
     const Address lo_value(rcx, rbx, Address::times_1, 0*wordSize);
     const Address hi_value(rcx, rbx, Address::times_1, 1*wordSize);
     switch (bytecode()) {          // load values into the jvalue object
     case Bytecodes::_fast_bputfield: __ movb(lo_value, rax); break;
     case Bytecodes::_fast_sputfield: __ movw(lo_value, rax); break;
     case Bytecodes::_fast_cputfield: __ movw(lo_value, rax); break;
     case Bytecodes::_fast_iputfield: __ movl(lo_value, rax);                         break;
     case Bytecodes::_fast_lputfield: __ movl(hi_value, rdx); __ movl(lo_value, rax); break;
     // need to call fld_s() after fstp_s() to restore the value for below
     case Bytecodes::_fast_fputfield: __ fstp_s(lo_value); __ fld_s(lo_value);        break;
     // need to call fld_d() after fstp_d() to restore the value for below
     case Bytecodes::_fast_dputfield: __ fstp_d(lo_value); __ fld_d(lo_value);        break;
     // since rcx is not an object we don't call store_check() here
     case Bytecodes::_fast_aputfield: __ movl(lo_value, rax);                         break;
     default:  ShouldNotReachHere();
     }
     __ pop_ptr(rbx);  // restore copy of object pointer
     // Save rax, and sometimes rdx because call_VM() will clobber them,
     // then use them for JVM/DI purposes
     __ pushl(rax);
     if (bytecode() == Bytecodes::_fast_lputfield) __ pushl(rdx);
     // access constant pool cache entry
     __ get_cache_entry_pointer_at_bcp(rax, rdx, 1);
     __ verify_oop(rbx);
     // rbx,: object pointer copied above
     // rax,: cache entry pointer
     // rcx: jvalue object on the stack
     __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::post_field_modification), rbx, rax, rcx);
     if (bytecode() == Bytecodes::_fast_lputfield) __ popl(rdx);  // restore high value
     __ popl(rax);     // restore lower value
     __ addl(rsp, sizeof(jvalue));  // release jvalue object space
     __ bind(L2);
   }
 }
 void TemplateTable::fast_storefield(TosState state) {
   transition(state, vtos);
   ByteSize base = constantPoolCacheOopDesc::base_offset();
   jvmti_post_fast_field_mod();
   // access constant pool cache
   __ get_cache_and_index_at_bcp(rcx, rbx, 1);
   // test for volatile with rdx but rdx is tos register for lputfield.
   if (bytecode() == Bytecodes::_fast_lputfield) __ pushl(rdx);
   __ movl(rdx, Address(rcx, rbx, Address::times_4, in_bytes(base +
                        ConstantPoolCacheEntry::flags_offset())));
   // replace index with field offset from cache entry
   __ movl(rbx, Address(rcx, rbx, Address::times_4, in_bytes(base + ConstantPoolCacheEntry::f2_offset())));
   // Doug Lea believes this is not needed with current Sparcs (TSO) and Intel (PSO).
   // volatile_barrier( );
   Label notVolatile, Done;
   __ shrl(rdx, ConstantPoolCacheEntry::volatileField);
   __ andl(rdx, 0x1);
   // Check for volatile store
   __ testl(rdx, rdx);
   __ jcc(Assembler::zero, notVolatile);
   if (bytecode() == Bytecodes::_fast_lputfield) __ popl(rdx);
   // Get object from stack
   pop_and_check_object(rcx);
   // field addresses
   const Address lo(rcx, rbx, Address::times_1, 0*wordSize);
   const Address hi(rcx, rbx, Address::times_1, 1*wordSize);
   // access field
   switch (bytecode()) {
     case Bytecodes::_fast_bputfield: __ movb(lo, rax); break;
     case Bytecodes::_fast_sputfield: // fall through
     case Bytecodes::_fast_cputfield: __ movw(lo, rax); break;
     case Bytecodes::_fast_iputfield: __ movl(lo, rax); break;
     case Bytecodes::_fast_lputfield: __ movl(hi, rdx); __ movl(lo, rax);        break;
     case Bytecodes::_fast_fputfield: __ fstp_s(lo); break;
     case Bytecodes::_fast_dputfield: __ fstp_d(lo); break;
     case Bytecodes::_fast_aputfield: {
       do_oop_store(_masm, lo, rax, _bs->kind(), false);
       break;
     }
     default:
       ShouldNotReachHere();
   }
   Label done;
   volatile_barrier( );
   // Barriers are so large that short branch doesn't reach!
   __ jmp(done);
   // Same code as above, but don't need rdx to test for volatile.
   __ bind(notVolatile);
   if (bytecode() == Bytecodes::_fast_lputfield) __ popl(rdx);
   // Get object from stack
   pop_and_check_object(rcx);
   // access field
   switch (bytecode()) {
     case Bytecodes::_fast_bputfield: __ movb(lo, rax); break;
     case Bytecodes::_fast_sputfield: // fall through
     case Bytecodes::_fast_cputfield: __ movw(lo, rax); break;
     case Bytecodes::_fast_iputfield: __ movl(lo, rax); break;
     case Bytecodes::_fast_lputfield: __ movl(hi, rdx); __ movl(lo, rax);        break;
     case Bytecodes::_fast_fputfield: __ fstp_s(lo); break;
     case Bytecodes::_fast_dputfield: __ fstp_d(lo); break;
     case Bytecodes::_fast_aputfield: {
       do_oop_store(_masm, lo, rax, _bs->kind(), false);
       break;
     }
     default:
       ShouldNotReachHere();
   }
   __ bind(done);
 }
 void TemplateTable::fast_accessfield(TosState state) {
   transition(atos, state);
   // do the JVMTI work here to avoid disturbing the register state below
   if (JvmtiExport::can_post_field_access()) {
     // Check to see if a field access watch has been set before we take
     // the time to call into the VM.
     Label L1;
     __ mov32(rcx, ExternalAddress((address) JvmtiExport::get_field_access_count_addr()));
     __ testl(rcx,rcx);
     __ jcc(Assembler::zero, L1);
     // access constant pool cache entry
     __ get_cache_entry_pointer_at_bcp(rcx, rdx, 1);
     __ push_ptr(rax);  // save object pointer before call_VM() clobbers it
     __ verify_oop(rax);
     // rax,: object pointer copied above
     // rcx: cache entry pointer
     __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::post_field_access), rax, rcx);
     __ pop_ptr(rax);   // restore object pointer
     __ bind(L1);
   }
   // access constant pool cache
   __ get_cache_and_index_at_bcp(rcx, rbx, 1);
   // replace index with field offset from cache entry
   __ movl(rbx, Address(rcx, rbx, Address::times_4, in_bytes(constantPoolCacheOopDesc::base_offset() + ConstantPoolCacheEntry::f2_offset())));
   // rax,: object
   __ verify_oop(rax);
   __ null_check(rax);
   // field addresses
   const Address lo = Address(rax, rbx, Address::times_1, 0*wordSize);
   const Address hi = Address(rax, rbx, Address::times_1, 1*wordSize);
   // access field
   switch (bytecode()) {
     case Bytecodes::_fast_bgetfield: __ movsxb(rax, lo );                 break;
     case Bytecodes::_fast_sgetfield: __ load_signed_word(rax, lo );       break;
     case Bytecodes::_fast_cgetfield: __ load_unsigned_word(rax, lo );     break;
     case Bytecodes::_fast_igetfield: __ movl(rax, lo);                    break;
     case Bytecodes::_fast_lgetfield: __ stop("should not be rewritten");  break;
     case Bytecodes::_fast_fgetfield: __ fld_s(lo);                        break;
     case Bytecodes::_fast_dgetfield: __ fld_d(lo);                        break;
     case Bytecodes::_fast_agetfield: __ movl(rax, lo); __ verify_oop(rax); break;
     default:
       ShouldNotReachHere();
   }
   // Doug Lea believes this is not needed with current Sparcs(TSO) and Intel(PSO)
   // volatile_barrier( );
 }
 void TemplateTable::fast_xaccess(TosState state) {
   transition(vtos, state);
   // get receiver
   __ movl(rax, aaddress(0));
   debug_only(__ verify_local_tag(frame::TagReference, 0));
   // access constant pool cache
   __ get_cache_and_index_at_bcp(rcx, rdx, 2);
   __ movl(rbx, Address(rcx, rdx, Address::times_4, in_bytes(constantPoolCacheOopDesc::base_offset() + ConstantPoolCacheEntry::f2_offset())));
   // make sure exception is reported in correct bcp range (getfield is next instruction)
   __ increment(rsi);
   __ null_check(rax);
   const Address lo = Address(rax, rbx, Address::times_1, 0*wordSize);
   if (state == itos) {
     __ movl(rax, lo);
   } else if (state == atos) {
     __ movl(rax, lo);
     __ verify_oop(rax);
   } else if (state == ftos) {
     __ fld_s(lo);
   } else {
     ShouldNotReachHere();
   }
   __ decrement(rsi);
 }
 //----------------------------------------------------------------------------------------------------
 // Calls
 void TemplateTable::count_calls(Register method, Register temp) {
   // implemented elsewhere
   ShouldNotReachHere();
 }
 void TemplateTable::prepare_invoke(Register method, Register index, int byte_no, Bytecodes::Code code) {
   // determine flags
   const bool is_invokeinterface  = code == Bytecodes::_invokeinterface;
   const bool is_invokevirtual    = code == Bytecodes::_invokevirtual;
   const bool is_invokespecial    = code == Bytecodes::_invokespecial;
   const bool load_receiver       = code != Bytecodes::_invokestatic;
   const bool receiver_null_check = is_invokespecial;
   const bool save_flags = is_invokeinterface || is_invokevirtual;
   // setup registers & access constant pool cache
   const Register recv   = rcx;
   const Register flags  = rdx;
   assert_different_registers(method, index, recv, flags);
   // save 'interpreter return address'
   __ save_bcp();
   load_invoke_cp_cache_entry(byte_no, method, index, flags, is_invokevirtual);
   // load receiver if needed (note: no return address pushed yet)
   if (load_receiver) {
     __ movl(recv, flags);
     __ andl(recv, 0xFF);
     // recv count is 0 based?
     __ movl(recv, Address(rsp, recv, Interpreter::stackElementScale(), -Interpreter::expr_offset_in_bytes(1)));
     __ verify_oop(recv);
   }
   // do null check if needed
   if (receiver_null_check) {
     __ null_check(recv);
   }
   if (save_flags) {
     __ movl(rsi, flags);
   }
   // compute return type
   __ shrl(flags, ConstantPoolCacheEntry::tosBits);
   // Make sure we don't need to mask flags for tosBits after the above shift
   ConstantPoolCacheEntry::verify_tosBits();
   // load return address
   { const int table =
       is_invokeinterface
       ? (int)Interpreter::return_5_addrs_by_index_table()
       : (int)Interpreter::return_3_addrs_by_index_table();
     __ movl(flags, Address(noreg, flags, Address::times_4, table));
   }
   // push return address
   __ pushl(flags);
   // Restore flag value from the constant pool cache, and restore rsi
   // for later null checks.  rsi is the bytecode pointer
   if (save_flags) {
     __ movl(flags, rsi);
     __ restore_bcp();
   }
 }
 void TemplateTable::invokevirtual_helper(Register index, Register recv,
                         Register flags) {
   // Uses temporary registers rax, rdx
   assert_different_registers(index, recv, rax, rdx);
   // Test for an invoke of a final method
   Label notFinal;
   __ movl(rax, flags);
   __ andl(rax, (1 << ConstantPoolCacheEntry::vfinalMethod));
   __ jcc(Assembler::zero, notFinal);
   Register method = index;  // method must be rbx,
   assert(method == rbx, "methodOop must be rbx, for interpreter calling convention");
   // do the call - the index is actually the method to call
   __ verify_oop(method);
   // It's final, need a null check here!
   __ null_check(recv);
   // profile this call
   __ profile_final_call(rax);
   __ jump_from_interpreted(method, rax);
   __ bind(notFinal);
   // get receiver klass
   __ null_check(recv, oopDesc::klass_offset_in_bytes());
   // Keep recv in rcx for callee expects it there
   __ movl(rax, Address(recv, oopDesc::klass_offset_in_bytes()));
   __ verify_oop(rax);
   // profile this call
   __ profile_virtual_call(rax, rdi, rdx);
   // get target methodOop & entry point
   const int base = instanceKlass::vtable_start_offset() * wordSize;
   assert(vtableEntry::size() * wordSize == 4, "adjust the scaling in the code below");
   __ movl(method, Address(rax, index, Address::times_4, base + vtableEntry::method_offset_in_bytes()));
   __ jump_from_interpreted(method, rdx);
 }
 void TemplateTable::invokevirtual(int byte_no) {
   transition(vtos, vtos);
   prepare_invoke(rbx, noreg, byte_no, bytecode());
   // rbx,: index
   // rcx: receiver
   // rdx: flags
   invokevirtual_helper(rbx, rcx, rdx);
 }
 void TemplateTable::invokespecial(int byte_no) {
   transition(vtos, vtos);
   prepare_invoke(rbx, noreg, byte_no, bytecode());
   // do the call
   __ verify_oop(rbx);
   __ profile_call(rax);
   __ jump_from_interpreted(rbx, rax);
 }
 void TemplateTable::invokestatic(int byte_no) {
   transition(vtos, vtos);
   prepare_invoke(rbx, noreg, byte_no, bytecode());
   // do the call
   __ verify_oop(rbx);
   __ profile_call(rax);
   __ jump_from_interpreted(rbx, rax);
 }
 void TemplateTable::fast_invokevfinal(int byte_no) {
   transition(vtos, vtos);
   __ stop("fast_invokevfinal not used on x86");
 }
 void TemplateTable::invokeinterface(int byte_no) {
   transition(vtos, vtos);
   prepare_invoke(rax, rbx, byte_no, bytecode());
   // rax,: Interface
   // rbx,: index
   // rcx: receiver
   // rdx: flags
   // Special case of invokeinterface called for virtual method of
   // java.lang.Object.  See cpCacheOop.cpp for details.
   // This code isn't produced by javac, but could be produced by
   // another compliant java compiler.
   Label notMethod;
   __ movl(rdi, rdx);
   __ andl(rdi, (1 << ConstantPoolCacheEntry::methodInterface));
   __ jcc(Assembler::zero, notMethod);
   invokevirtual_helper(rbx, rcx, rdx);
   __ bind(notMethod);
   // Get receiver klass into rdx - also a null check
   __ restore_locals();  // restore rdi
   __ movl(rdx, Address(rcx, oopDesc::klass_offset_in_bytes()));
   __ verify_oop(rdx);
   // profile this call
   __ profile_virtual_call(rdx, rsi, rdi);
   __ movl(rdi, rdx); // Save klassOop in rdi
   // Compute start of first itableOffsetEntry (which is at the end of the vtable)
   const int base = instanceKlass::vtable_start_offset() * wordSize;
   assert(vtableEntry::size() * wordSize == 4, "adjust the scaling in the code below");
   __ movl(rsi, Address(rdx, instanceKlass::vtable_length_offset() * wordSize)); // Get length of vtable
   __ leal(rdx, Address(rdx, rsi, Address::times_4, base));
   if (HeapWordsPerLong > 1) {
     // Round up to align_object_offset boundary
     __ round_to(rdx, BytesPerLong);
   }
   Label entry, search, interface_ok;
   __ jmpb(entry);
   __ bind(search);
   __ addl(rdx, itableOffsetEntry::size() * wordSize);
   __ bind(entry);
   // Check that the entry is non-null.  A null entry means that the receiver
   // class doesn't implement the interface, and wasn't the same as the
   // receiver class checked when the interface was resolved.
   __ pushl(rdx);
   __ movl(rdx, Address(rdx, itableOffsetEntry::interface_offset_in_bytes()));
   __ testl(rdx, rdx);
   __ jcc(Assembler::notZero, interface_ok);
   // throw exception
   __ popl(rdx);          // pop saved register first.
   __ popl(rbx);          // pop return address (pushed by prepare_invoke)
   __ restore_bcp();      // rsi must be correct for exception handler   (was destroyed)
   __ restore_locals();   // make sure locals pointer is correct as well (was destroyed)
   __ call_VM(noreg, CAST_FROM_FN_PTR(address,
                    InterpreterRuntime::throw_IncompatibleClassChangeError));
   // the call_VM checks for exception, so we should never return here.
   __ should_not_reach_here();
   __ bind(interface_ok);
     __ popl(rdx);
     __ cmpl(rax, Address(rdx, itableOffsetEntry::interface_offset_in_bytes()));
     __ jcc(Assembler::notEqual, search);
     __ movl(rdx, Address(rdx, itableOffsetEntry::offset_offset_in_bytes()));
     __ addl(rdx, rdi); // Add offset to klassOop
     assert(itableMethodEntry::size() * wordSize == 4, "adjust the scaling in the code below");
     __ movl(rbx, Address(rdx, rbx, Address::times_4));
     // rbx,: methodOop to call
     // rcx: receiver
     // Check for abstract method error
     // Note: This should be done more efficiently via a throw_abstract_method_error
     //       interpreter entry point and a conditional jump to it in case of a null
     //       method.
     { Label L;
       __ testl(rbx, rbx);
       __ jcc(Assembler::notZero, L);
       // throw exception
           // note: must restore interpreter registers to canonical
           //       state for exception handling to work correctly!
           __ popl(rbx);          // pop return address (pushed by prepare_invoke)
           __ restore_bcp();      // rsi must be correct for exception handler   (was destroyed)
           __ restore_locals();   // make sure locals pointer is correct as well (was destroyed)
       __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_AbstractMethodError));
       // the call_VM checks for exception, so we should never return here.
       __ should_not_reach_here();
       __ bind(L);
     }
   // do the call
   // rcx: receiver
   // rbx,: methodOop
   __ jump_from_interpreted(rbx, rdx);
 }
 //----------------------------------------------------------------------------------------------------
 // Allocation
 void TemplateTable::_new() {
   transition(vtos, atos);
   __ get_unsigned_2_byte_index_at_bcp(rdx, 1);
   Label slow_case;
   Label done;
   Label initialize_header;
   Label initialize_object;  // including clearing the fields
   Label allocate_shared;
   __ get_cpool_and_tags(rcx, rax);
   // get instanceKlass
   __ movl(rcx, Address(rcx, rdx, Address::times_4, sizeof(constantPoolOopDesc)));
   __ pushl(rcx);  // save the contexts of klass for initializing the header
   // make sure the class we're about to instantiate has been resolved.
   // Note: slow_case does a pop of stack, which is why we loaded class/pushed above
   const int tags_offset = typeArrayOopDesc::header_size(T_BYTE) * wordSize;
   __ cmpb(Address(rax, rdx, Address::times_1, tags_offset), JVM_CONSTANT_Class);
   __ jcc(Assembler::notEqual, slow_case);
   // make sure klass is initialized & doesn't have finalizer
   // make sure klass is fully initialized
   __ cmpl(Address(rcx, instanceKlass::init_state_offset_in_bytes() + sizeof(oopDesc)), instanceKlass::fully_initialized);
   __ jcc(Assembler::notEqual, slow_case);
   // get instance_size in instanceKlass (scaled to a count of bytes)
   __ movl(rdx, Address(rcx, Klass::layout_helper_offset_in_bytes() + sizeof(oopDesc)));
   // test to see if it has a finalizer or is malformed in some way
   __ testl(rdx, Klass::_lh_instance_slow_path_bit);
   __ jcc(Assembler::notZero, slow_case);
   //
   // Allocate the instance
   // 1) Try to allocate in the TLAB
   // 2) if fail and the object is large allocate in the shared Eden
   // 3) if the above fails (or is not applicable), go to a slow case
   // (creates a new TLAB, etc.)
   const bool allow_shared_alloc =
     Universe::heap()->supports_inline_contig_alloc() && !CMSIncrementalMode;
   if (UseTLAB) {
     const Register thread = rcx;
     __ get_thread(thread);
     __ movl(rax, Address(thread, in_bytes(JavaThread::tlab_top_offset())));
     __ leal(rbx, Address(rax, rdx, Address::times_1));
     __ cmpl(rbx, Address(thread, in_bytes(JavaThread::tlab_end_offset())));
     __ jcc(Assembler::above, allow_shared_alloc ? allocate_shared : slow_case);
     __ movl(Address(thread, in_bytes(JavaThread::tlab_top_offset())), rbx);
     if (ZeroTLAB) {
       // the fields have been already cleared
       __ jmp(initialize_header);
     } else {
       // initialize both the header and fields
       __ jmp(initialize_object);
     }
   }
   // Allocation in the shared Eden, if allowed.
   //
   // rdx: instance size in bytes
   if (allow_shared_alloc) {
     __ bind(allocate_shared);
     ExternalAddress heap_top((address)Universe::heap()->top_addr());
     Label retry;
     __ bind(retry);
     __ mov32(rax, heap_top);
     __ leal(rbx, Address(rax, rdx, Address::times_1));
     __ cmp32(rbx, ExternalAddress((address)Universe::heap()->end_addr()));
     __ jcc(Assembler::above, slow_case);
     // Compare rax, with the top addr, and if still equal, store the new
     // top addr in rbx, at the address of the top addr pointer. Sets ZF if was
     // equal, and clears it otherwise. Use lock prefix for atomicity on MPs.
     //
     // rax,: object begin
     // rbx,: object end
     // rdx: instance size in bytes
     if (os::is_MP()) __ lock();
     __ cmpxchgptr(rbx, heap_top);
     // if someone beat us on the allocation, try again, otherwise continue
     __ jcc(Assembler::notEqual, retry);
   }
   if (UseTLAB || Universe::heap()->supports_inline_contig_alloc()) {
     // The object is initialized before the header.  If the object size is
     // zero, go directly to the header initialization.
     __ bind(initialize_object);
     __ decrement(rdx, sizeof(oopDesc));
     __ jcc(Assembler::zero, initialize_header);
   // Initialize topmost object field, divide rdx by 8, check if odd and
   // test if zero.
     __ xorl(rcx, rcx);    // use zero reg to clear memory (shorter code)
     __ shrl(rdx, LogBytesPerLong); // divide by 2*oopSize and set carry flag if odd
   // rdx must have been multiple of 8
 #ifdef ASSERT
     // make sure rdx was multiple of 8
     Label L;
     // Ignore partial flag stall after shrl() since it is debug VM
     __ jccb(Assembler::carryClear, L);
     __ stop("object size is not multiple of 2 - adjust this code");
     __ bind(L);
     // rdx must be > 0, no extra check needed here
 #endif
     // initialize remaining object fields: rdx was a multiple of 8
     { Label loop;
     __ bind(loop);
     __ movl(Address(rax, rdx, Address::times_8, sizeof(oopDesc) - 1*oopSize), rcx);
     __ movl(Address(rax, rdx, Address::times_8, sizeof(oopDesc) - 2*oopSize), rcx);
     __ decrement(rdx);
     __ jcc(Assembler::notZero, loop);
     }
     // initialize object header only.
     __ bind(initialize_header);
     if (UseBiasedLocking) {
       __ popl(rcx);   // get saved klass back in the register.
       __ movl(rbx, Address(rcx, Klass::prototype_header_offset_in_bytes() + klassOopDesc::klass_part_offset_in_bytes()));
       __ movl(Address(rax, oopDesc::mark_offset_in_bytes ()), rbx);
     } else {
       __ movl(Address(rax, oopDesc::mark_offset_in_bytes ()),
               (int)markOopDesc::prototype()); // header
       __ popl(rcx);   // get saved klass back in the register.
     }
     __ movl(Address(rax, oopDesc::klass_offset_in_bytes()), rcx);  // klass
     {
       SkipIfEqual skip_if(_masm, &DTraceAllocProbes, 0);
       // Trigger dtrace event for fastpath
       __ push(atos);
       __ call_VM_leaf(
            CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_object_alloc), rax);
       __ pop(atos);
     }
     __ jmp(done);
   }
   // slow case
   __ bind(slow_case);
   __ popl(rcx);   // restore stack pointer to what it was when we came in.
   __ get_constant_pool(rax);
   __ get_unsigned_2_byte_index_at_bcp(rdx, 1);
   call_VM(rax, CAST_FROM_FN_PTR(address, InterpreterRuntime::_new), rax, rdx);
   // continue
   __ bind(done);
 }
 void TemplateTable::newarray() {
   transition(itos, atos);
   __ push_i(rax);                                 // make sure everything is on the stack
   __ load_unsigned_byte(rdx, at_bcp(1));
   call_VM(rax, CAST_FROM_FN_PTR(address, InterpreterRuntime::newarray), rdx, rax);
   __ pop_i(rdx);                                  // discard size
 }
 void TemplateTable::anewarray() {
   transition(itos, atos);
   __ get_unsigned_2_byte_index_at_bcp(rdx, 1);
   __ get_constant_pool(rcx);
   call_VM(rax, CAST_FROM_FN_PTR(address, InterpreterRuntime::anewarray), rcx, rdx, rax);
 }
 void TemplateTable::arraylength() {
   transition(atos, itos);
   __ null_check(rax, arrayOopDesc::length_offset_in_bytes());
   __ movl(rax, Address(rax, arrayOopDesc::length_offset_in_bytes()));
 }
 void TemplateTable::checkcast() {
   transition(atos, atos);
   Label done, is_null, ok_is_subtype, quicked, resolved;
   __ testl(rax, rax);   // Object is in EAX
   __ jcc(Assembler::zero, is_null);
   // Get cpool & tags index
   __ get_cpool_and_tags(rcx, rdx); // ECX=cpool, EDX=tags array
   __ get_unsigned_2_byte_index_at_bcp(rbx, 1); // EBX=index
   // See if bytecode has already been quicked
   __ cmpb(Address(rdx, rbx, Address::times_1, typeArrayOopDesc::header_size(T_BYTE) * wordSize), JVM_CONSTANT_Class);
   __ jcc(Assembler::equal, quicked);
   __ push(atos);
   call_VM(rax, CAST_FROM_FN_PTR(address, InterpreterRuntime::quicken_io_cc) );
   __ pop_ptr(rdx);
   __ jmpb(resolved);
   // Get superklass in EAX and subklass in EBX
   __ bind(quicked);
   __ movl(rdx, rax);          // Save object in EDX; EAX needed for subtype check
   __ movl(rax, Address(rcx, rbx, Address::times_4, sizeof(constantPoolOopDesc)));
   __ bind(resolved);
   __ movl(rbx, Address(rdx, oopDesc::klass_offset_in_bytes()));
   // Generate subtype check.  Blows ECX.  Resets EDI.  Object in EDX.
   // Superklass in EAX.  Subklass in EBX.
   __ gen_subtype_check( rbx, ok_is_subtype );
   // Come here on failure
   __ pushl(rdx);
   // object is at TOS
   __ jump(ExternalAddress(Interpreter::_throw_ClassCastException_entry));
   // Come here on success
   __ bind(ok_is_subtype);
   __ movl(rax,rdx);           // Restore object in EDX
   // Collect counts on whether this check-cast sees NULLs a lot or not.
   if (ProfileInterpreter) {
     __ jmp(done);
     __ bind(is_null);
     __ profile_null_seen(rcx);
   } else {
     __ bind(is_null);   // same as 'done'
   }
   __ bind(done);
 }
 void TemplateTable::instanceof() {
   transition(atos, itos);
   Label done, is_null, ok_is_subtype, quicked, resolved;
   __ testl(rax, rax);
   __ jcc(Assembler::zero, is_null);
   // Get cpool & tags index
   __ get_cpool_and_tags(rcx, rdx); // ECX=cpool, EDX=tags array
   __ get_unsigned_2_byte_index_at_bcp(rbx, 1); // EBX=index
   // See if bytecode has already been quicked
   __ cmpb(Address(rdx, rbx, Address::times_1, typeArrayOopDesc::header_size(T_BYTE) * wordSize), JVM_CONSTANT_Class);
   __ jcc(Assembler::equal, quicked);
   __ push(atos);
   call_VM(rax, CAST_FROM_FN_PTR(address, InterpreterRuntime::quicken_io_cc) );
   __ pop_ptr(rdx);
   __ movl(rdx, Address(rdx, oopDesc::klass_offset_in_bytes()));
   __ jmp(resolved);
   // Get superklass in EAX and subklass in EDX
   __ bind(quicked);
   __ movl(rdx, Address(rax, oopDesc::klass_offset_in_bytes()));
   __ movl(rax, Address(rcx, rbx, Address::times_4, sizeof(constantPoolOopDesc)));
   __ bind(resolved);
   // Generate subtype check.  Blows ECX.  Resets EDI.
   // Superklass in EAX.  Subklass in EDX.
   __ gen_subtype_check( rdx, ok_is_subtype );
   // Come here on failure
   __ xorl(rax,rax);
   __ jmpb(done);
   // Come here on success
   __ bind(ok_is_subtype);
   __ movl(rax, 1);
   // Collect counts on whether this test sees NULLs a lot or not.
   if (ProfileInterpreter) {
     __ jmp(done);
     __ bind(is_null);
     __ profile_null_seen(rcx);
   } else {
     __ bind(is_null);   // same as 'done'
   }
   __ bind(done);
   // rax, = 0: obj == NULL or  obj is not an instanceof the specified klass
   // rax, = 1: obj != NULL and obj is     an instanceof the specified klass
 }
 //----------------------------------------------------------------------------------------------------
 // Breakpoints
 void TemplateTable::_breakpoint() {
   // Note: We get here even if we are single stepping..
   // jbug inists on setting breakpoints at every bytecode
   // even if we are in single step mode.
   transition(vtos, vtos);
   // get the unpatched byte code
   __ get_method(rcx);
   __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::get_original_bytecode_at), rcx, rsi);
   __ movl(rbx, rax);
   // post the breakpoint event
   __ get_method(rcx);
   __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::_breakpoint), rcx, rsi);
   // complete the execution of original bytecode
   __ dispatch_only_normal(vtos);
 }
 //----------------------------------------------------------------------------------------------------
 // Exceptions
 void TemplateTable::athrow() {
   transition(atos, vtos);
   __ null_check(rax);
   __ jump(ExternalAddress(Interpreter::throw_exception_entry()));
 }
 //----------------------------------------------------------------------------------------------------
 // Synchronization
 //
 // Note: monitorenter & exit are symmetric routines; which is reflected
 //       in the assembly code structure as well
 //
 // Stack layout:
 //
 // [expressions  ] <--- rsp               = expression stack top
 // ..
 // [expressions  ]
 // [monitor entry] <--- monitor block top = expression stack bot
 // ..
 // [monitor entry]
 // [frame data   ] <--- monitor block bot
 // ...
 // [saved rbp,    ] <--- rbp,
 void TemplateTable::monitorenter() {
   transition(atos, vtos);
   // check for NULL object
   __ null_check(rax);
   const Address monitor_block_top(rbp, frame::interpreter_frame_monitor_block_top_offset * wordSize);
   const Address monitor_block_bot(rbp, frame::interpreter_frame_initial_sp_offset        * wordSize);
   const int entry_size =         (     frame::interpreter_frame_monitor_size()           * wordSize);
   Label allocated;
   // initialize entry pointer
   __ xorl(rdx, rdx);                             // points to free slot or NULL
   // find a free slot in the monitor block (result in rdx)
   { Label entry, loop, exit;
     __ movl(rcx, monitor_block_top);             // points to current entry, starting with top-most entry
     __ leal(rbx, monitor_block_bot);             // points to word before bottom of monitor block
     __ jmpb(entry);
     __ bind(loop);
     __ cmpl(Address(rcx, BasicObjectLock::obj_offset_in_bytes()), NULL_WORD);  // check if current entry is used
 // TODO - need new func here - kbt
     if (VM_Version::supports_cmov()) {
       __ cmovl(Assembler::equal, rdx, rcx);      // if not used then remember entry in rdx
     } else {
       Label L;
       __ jccb(Assembler::notEqual, L);
       __ movl(rdx, rcx);                         // if not used then remember entry in rdx
       __ bind(L);
     }
     __ cmpl(rax, Address(rcx, BasicObjectLock::obj_offset_in_bytes()));   // check if current entry is for same object
     __ jccb(Assembler::equal, exit);              // if same object then stop searching
     __ addl(rcx, entry_size);                    // otherwise advance to next entry
     __ bind(entry);
     __ cmpl(rcx, rbx);                           // check if bottom reached
     __ jcc(Assembler::notEqual, loop);           // if not at bottom then check this entry
     __ bind(exit);
   }
   __ testl(rdx, rdx);                            // check if a slot has been found
   __ jccb(Assembler::notZero, allocated);         // if found, continue with that one
   // allocate one if there's no free slot
   { Label entry, loop;
     // 1. compute new pointers                   // rsp: old expression stack top
     __ movl(rdx, monitor_block_bot);             // rdx: old expression stack bottom
     __ subl(rsp, entry_size);                    // move expression stack top
     __ subl(rdx, entry_size);                    // move expression stack bottom
     __ movl(rcx, rsp);                           // set start value for copy loop
     __ movl(monitor_block_bot, rdx);             // set new monitor block top
     __ jmp(entry);
     // 2. move expression stack contents
     __ bind(loop);
     __ movl(rbx, Address(rcx, entry_size));      // load expression stack word from old location
     __ movl(Address(rcx, 0), rbx);               // and store it at new location
     __ addl(rcx, wordSize);                      // advance to next word
     __ bind(entry);
     __ cmpl(rcx, rdx);                           // check if bottom reached
     __ jcc(Assembler::notEqual, loop);           // if not at bottom then copy next word
   }
   // call run-time routine
   // rdx: points to monitor entry
   __ bind(allocated);
   // Increment bcp to point to the next bytecode, so exception handling for async. exceptions work correctly.
   // The object has already been poped from the stack, so the expression stack looks correct.
   __ increment(rsi);
   __ movl(Address(rdx, BasicObjectLock::obj_offset_in_bytes()), rax);     // store object
   __ lock_object(rdx);
   // check to make sure this monitor doesn't cause stack overflow after locking
   __ save_bcp();  // in case of exception
   __ generate_stack_overflow_check(0);
   // The bcp has already been incremented. Just need to dispatch to next instruction.
   __ dispatch_next(vtos);
 }
 void TemplateTable::monitorexit() {
   transition(atos, vtos);
   // check for NULL object
   __ null_check(rax);
   const Address monitor_block_top(rbp, frame::interpreter_frame_monitor_block_top_offset * wordSize);
   const Address monitor_block_bot(rbp, frame::interpreter_frame_initial_sp_offset        * wordSize);
   const int entry_size =         (     frame::interpreter_frame_monitor_size()           * wordSize);
   Label found;
   // find matching slot
   { Label entry, loop;
     __ movl(rdx, monitor_block_top);             // points to current entry, starting with top-most entry
     __ leal(rbx, monitor_block_bot);             // points to word before bottom of monitor block
     __ jmpb(entry);
     __ bind(loop);
     __ cmpl(rax, Address(rdx, BasicObjectLock::obj_offset_in_bytes()));   // check if current entry is for same object
     __ jcc(Assembler::equal, found);             // if same object then stop searching
     __ addl(rdx, entry_size);                    // otherwise advance to next entry
     __ bind(entry);
     __ cmpl(rdx, rbx);                           // check if bottom reached
     __ jcc(Assembler::notEqual, loop);           // if not at bottom then check this entry
   }
   // error handling. Unlocking was not block-structured
   Label end;
   __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_illegal_monitor_state_exception));
   __ should_not_reach_here();
   // call run-time routine
   // rcx: points to monitor entry
   __ bind(found);
   __ push_ptr(rax);                                 // make sure object is on stack (contract with oopMaps)
   __ unlock_object(rdx);
   __ pop_ptr(rax);                                  // discard object
   __ bind(end);
 }
 //----------------------------------------------------------------------------------------------------
 // Wide instructions
 void TemplateTable::wide() {
   transition(vtos, vtos);
   __ load_unsigned_byte(rbx, at_bcp(1));
   __ jmp(Address(noreg, rbx, Address::times_4, int(Interpreter::_wentry_point)));
   // Note: the rsi increment step is part of the individual wide bytecode implementations
 }
 //----------------------------------------------------------------------------------------------------
 // Multi arrays
 void TemplateTable::multianewarray() {
   transition(vtos, atos);
   __ load_unsigned_byte(rax, at_bcp(3)); // get number of dimensions
   // last dim is on top of stack; we want address of first one:
   // first_addr = last_addr + (ndims - 1) * stackElementSize - 1*wordsize
   // the latter wordSize to point to the beginning of the array.
   __ leal(  rax, Address(rsp, rax, Interpreter::stackElementScale(), -wordSize));
   call_VM(rax, CAST_FROM_FN_PTR(address, InterpreterRuntime::multianewarray), rax);     // pass in rax,
   __ load_unsigned_byte(rbx, at_bcp(3));
   __ leal(rsp, Address(rsp, rbx, Interpreter::stackElementScale()));  // get rid of counts
 }
 #endif /* !CC_INTERP */

Mercurial > jdk8-mips64-public > hotspot / annotate

src/cpu/x86/vm/templateTable_x86_32.cpp@37f87013dfd8 (annotated)

src/cpu/x86/vm/templateTable_x86_32.cpp