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

 /*

  * Copyright 2003-2007 Sun Microsystems, Inc.  All Rights Reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

  * CA 95054 USA or visit www.sun.com if you need additional information or

  * have any questions.

  *

  */

 #include "incls/_precompiled.incl"

 #include "incls/_interp_masm_x86_64.cpp.incl"

 // Implementation of InterpreterMacroAssembler

 void InterpreterMacroAssembler::call_VM_leaf_base(address entry_point,

                                                   int number_of_arguments) {

   // interpreter specific

   //

   // Note: No need to save/restore bcp & locals (r13 & r14) pointer

   //       since these are callee saved registers and no blocking/

   //       GC can happen in leaf calls.

 #ifdef ASSERT

   save_bcp();

   {

     Label L;

     cmpq(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), (int)NULL_WORD);

     jcc(Assembler::equal, L);

     stop("InterpreterMacroAssembler::call_VM_leaf_base:"

          " last_sp != NULL");

     bind(L);

   }

 #endif

   // super call

   MacroAssembler::call_VM_leaf_base(entry_point, number_of_arguments);

   // interpreter specific

 #ifdef ASSERT

   {

     Label L;

     cmpq(r13, Address(rbp, frame::interpreter_frame_bcx_offset * wordSize));

     jcc(Assembler::equal, L);

     stop("InterpreterMacroAssembler::call_VM_leaf_base:"

          " r13 not callee saved?");

     bind(L);

   }

   {

     Label L;

     cmpq(r14, Address(rbp, frame::interpreter_frame_locals_offset * wordSize));

     jcc(Assembler::equal, L);

     stop("InterpreterMacroAssembler::call_VM_leaf_base:"

          " r14 not callee saved?");

     bind(L);

   }

 #endif

 }

 void InterpreterMacroAssembler::call_VM_base(Register oop_result,

                                              Register java_thread,

                                              Register last_java_sp,

                                              address  entry_point,

                                              int      number_of_arguments,

                                              bool     check_exceptions) {

   // interpreter specific

   //

   // Note: Could avoid restoring locals ptr (callee saved) - however doesn't

   //       really make a difference for these runtime calls, since they are

   //       slow anyway. Btw., bcp must be saved/restored since it may change

   //       due to GC.

   // assert(java_thread == noreg , "not expecting a precomputed java thread");

   save_bcp();

 #ifdef ASSERT

   {

     Label L;

     cmpq(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), (int)NULL_WORD);

     jcc(Assembler::equal, L);

     stop("InterpreterMacroAssembler::call_VM_leaf_base:"

          " last_sp != NULL");

     bind(L);

   }

 #endif /* ASSERT */

   // super call

   MacroAssembler::call_VM_base(oop_result, noreg, last_java_sp,

                                entry_point, number_of_arguments,

                                check_exceptions);

   // interpreter specific

   restore_bcp();

   restore_locals();

 }

 void InterpreterMacroAssembler::check_and_handle_popframe(Register java_thread) {

   if (JvmtiExport::can_pop_frame()) {

     Label L;

     // Initiate popframe handling only if it is not already being

     // processed.  If the flag has the popframe_processing bit set, it

     // means that this code is called *during* popframe handling - we

     // don't want to reenter.

     // This method is only called just after the call into the vm in

     // call_VM_base, so the arg registers are available.

     movl(c_rarg0, Address(r15_thread, JavaThread::popframe_condition_offset()));

     testl(c_rarg0, JavaThread::popframe_pending_bit);

     jcc(Assembler::zero, L);

     testl(c_rarg0, JavaThread::popframe_processing_bit);

     jcc(Assembler::notZero, L);

     // Call Interpreter::remove_activation_preserving_args_entry() to get the

     // address of the same-named entrypoint in the generated interpreter code.

     call_VM_leaf(CAST_FROM_FN_PTR(address, Interpreter::remove_activation_preserving_args_entry));

     jmp(rax);

     bind(L);

   }

 }

 void InterpreterMacroAssembler::load_earlyret_value(TosState state) {

   movq(rcx, Address(r15_thread, JavaThread::jvmti_thread_state_offset()));

   const Address tos_addr(rcx, JvmtiThreadState::earlyret_tos_offset());

   const Address oop_addr(rcx, JvmtiThreadState::earlyret_oop_offset());

   const Address val_addr(rcx, JvmtiThreadState::earlyret_value_offset());

   switch (state) {

     case atos: movq(rax, oop_addr);

                movptr(oop_addr, NULL_WORD);

                verify_oop(rax, state);              break;

     case ltos: movq(rax, val_addr);                 break;

     case btos:                                   // fall through

     case ctos:                                   // fall through

     case stos:                                   // fall through

     case itos: movl(rax, val_addr);                 break;

     case ftos: movflt(xmm0, val_addr);              break;

     case dtos: movdbl(xmm0, val_addr);              break;

     case vtos: /* nothing to do */                  break;

     default  : ShouldNotReachHere();

   }

   // Clean up tos value in the thread object

   movl(tos_addr,  (int) ilgl);

   movl(val_addr,  (int) NULL_WORD);

 }

 void InterpreterMacroAssembler::check_and_handle_earlyret(Register java_thread) {

   if (JvmtiExport::can_force_early_return()) {

     Label L;

     movq(c_rarg0, Address(r15_thread, JavaThread::jvmti_thread_state_offset()));

     testq(c_rarg0, c_rarg0);

     jcc(Assembler::zero, L); // if (thread->jvmti_thread_state() == NULL) exit;

     // Initiate earlyret handling only if it is not already being processed.

     // If the flag has the earlyret_processing bit set, it means that this code

     // is called *during* earlyret handling - we don't want to reenter.

     movl(c_rarg0, Address(c_rarg0, JvmtiThreadState::earlyret_state_offset()));

     cmpl(c_rarg0, JvmtiThreadState::earlyret_pending);

     jcc(Assembler::notEqual, L);

     // Call Interpreter::remove_activation_early_entry() to get the address of the

     // same-named entrypoint in the generated interpreter code.

     movq(c_rarg0, Address(r15_thread, JavaThread::jvmti_thread_state_offset()));

     movl(c_rarg0, Address(c_rarg0, JvmtiThreadState::earlyret_tos_offset()));

     call_VM_leaf(CAST_FROM_FN_PTR(address, Interpreter::remove_activation_early_entry), c_rarg0);

     jmp(rax);

     bind(L);

   }

 }

 void InterpreterMacroAssembler::get_unsigned_2_byte_index_at_bcp(

   Register reg,

   int bcp_offset) {

   assert(bcp_offset >= 0, "bcp is still pointing to start of bytecode");

   movl(reg, Address(r13, bcp_offset));

   bswapl(reg);

   shrl(reg, 16);

 }

 void InterpreterMacroAssembler::get_cache_and_index_at_bcp(Register cache,

                                                            Register index,

                                                            int bcp_offset) {

   assert(bcp_offset > 0, "bcp is still pointing to start of bytecode");

   assert(cache != index, "must use different registers");

   load_unsigned_word(index, Address(r13, bcp_offset));

   movq(cache, Address(rbp, frame::interpreter_frame_cache_offset * wordSize));

   assert(sizeof(ConstantPoolCacheEntry) == 4 * wordSize, "adjust code below");

   // convert from field index to ConstantPoolCacheEntry index

   shll(index, 2);

 }

 void InterpreterMacroAssembler::get_cache_entry_pointer_at_bcp(Register cache,

                                                                Register tmp,

                                                                int bcp_offset) {

   assert(bcp_offset > 0, "bcp is still pointing to start of bytecode");

   assert(cache != tmp, "must use different register");

   load_unsigned_word(tmp, Address(r13, bcp_offset));

   assert(sizeof(ConstantPoolCacheEntry) == 4 * wordSize, "adjust code below");

   // convert from field index to ConstantPoolCacheEntry index

   // and from word offset to byte offset

   shll(tmp, 2 + LogBytesPerWord);

   movq(cache, Address(rbp, frame::interpreter_frame_cache_offset * wordSize));

   // skip past the header

   addq(cache, in_bytes(constantPoolCacheOopDesc::base_offset()));

   addq(cache, tmp);  // construct pointer to cache entry

 }

 // Generate a subtype check: branch to ok_is_subtype if sub_klass is a

 // subtype of super_klass.

 //

 // Args:

 //      rax: superklass

 //      Rsub_klass: subklass

 //

 // Kills:

 //      rcx, rdi

 void InterpreterMacroAssembler::gen_subtype_check(Register Rsub_klass,

                                                   Label& ok_is_subtype) {

   assert(Rsub_klass != rax, "rax holds superklass");

   assert(Rsub_klass != r14, "r14 holds locals");

   assert(Rsub_klass != r13, "r13 holds bcp");

   assert(Rsub_klass != rcx, "rcx holds 2ndary super array length");

   assert(Rsub_klass != rdi, "rdi holds 2ndary super array scan ptr");

   Label not_subtype, loop;

   // Profile the not-null value's klass.

   profile_typecheck(rcx, Rsub_klass, rdi); // blows rcx, rdi

   // Load the super-klass's check offset into rcx

   movl(rcx, Address(rax, sizeof(oopDesc) +

                     Klass::super_check_offset_offset_in_bytes()));

   // Load from the sub-klass's super-class display list, or a 1-word

   // cache of the secondary superclass list, or a failing value with a

   // sentinel offset if the super-klass is an interface or

   // exceptionally deep in the Java hierarchy and we have to scan the

   // secondary superclass list the hard way.  See if we get an

   // immediate positive hit

   cmpq(rax, Address(Rsub_klass, rcx, Address::times_1));

   jcc(Assembler::equal,ok_is_subtype);

   // Check for immediate negative hit

   cmpl(rcx, sizeof(oopDesc) + Klass::secondary_super_cache_offset_in_bytes());

   jcc( Assembler::notEqual, not_subtype );

   // Check for self

   cmpq(Rsub_klass, rax);

   jcc(Assembler::equal, ok_is_subtype);

   // Now do a linear scan of the secondary super-klass chain.

   movq(rdi, Address(Rsub_klass, sizeof(oopDesc) +

                     Klass::secondary_supers_offset_in_bytes()));

   // rdi holds the objArrayOop of secondary supers.

   // Load the array length

   movl(rcx, Address(rdi, arrayOopDesc::length_offset_in_bytes()));

   // Skip to start of data; also clear Z flag incase rcx is zero

   addq(rdi, arrayOopDesc::base_offset_in_bytes(T_OBJECT));

   // Scan rcx words at [rdi] for occurance of rax

   // Set NZ/Z based on last compare

   repne_scan();

   // Not equal?

   jcc(Assembler::notEqual, not_subtype);

   // Must be equal but missed in cache.  Update cache.

   movq(Address(Rsub_klass, sizeof(oopDesc) +

                Klass::secondary_super_cache_offset_in_bytes()), rax);

   jmp(ok_is_subtype);

   bind(not_subtype);

   profile_typecheck_failed(rcx); // blows rcx

 }

 // Java Expression Stack

 #ifdef ASSERT

 // Verifies that the stack tag matches.  Must be called before the stack

 // value is popped off the stack.

 void InterpreterMacroAssembler::verify_stack_tag(frame::Tag t) {

   if (TaggedStackInterpreter) {

     frame::Tag tag = t;

     if (t == frame::TagCategory2) {

       tag = frame::TagValue;

       Label hokay;

       cmpq(Address(rsp, 3*wordSize), (int)tag);

       jcc(Assembler::equal, hokay);

       stop("Java Expression stack tag high value is bad");

       bind(hokay);

     }

     Label okay;

     cmpq(Address(rsp, wordSize), (int)tag);

     jcc(Assembler::equal, okay);

     // Also compare if the stack value is zero, then the tag might

     // not have been set coming from deopt.

     cmpq(Address(rsp, 0), 0);

     jcc(Assembler::equal, okay);

     stop("Java Expression stack tag value is bad");

     bind(okay);

   }

 }

 #endif // ASSERT

 void InterpreterMacroAssembler::pop_ptr(Register r) {

   debug_only(verify_stack_tag(frame::TagReference));

   popq(r);

   if (TaggedStackInterpreter) addq(rsp, 1 * wordSize);

 }

 void InterpreterMacroAssembler::pop_ptr(Register r, Register tag) {

   popq(r);

   if (TaggedStackInterpreter) popq(tag);

 }

 void InterpreterMacroAssembler::pop_i(Register r) {

   // XXX can't use popq currently, upper half non clean

   debug_only(verify_stack_tag(frame::TagValue));

   movl(r, Address(rsp, 0));

   addq(rsp, wordSize);

   if (TaggedStackInterpreter) addq(rsp, 1 * wordSize);

 }

 void InterpreterMacroAssembler::pop_l(Register r) {

   debug_only(verify_stack_tag(frame::TagCategory2));

   movq(r, Address(rsp, 0));

   addq(rsp, 2 * Interpreter::stackElementSize());

 }

 void InterpreterMacroAssembler::pop_f(XMMRegister r) {

   debug_only(verify_stack_tag(frame::TagValue));

   movflt(r, Address(rsp, 0));

   addq(rsp, wordSize);

   if (TaggedStackInterpreter) addq(rsp, 1 * wordSize);

 }

 void InterpreterMacroAssembler::pop_d(XMMRegister r) {

   debug_only(verify_stack_tag(frame::TagCategory2));

   movdbl(r, Address(rsp, 0));

   addq(rsp, 2 * Interpreter::stackElementSize());

 }

 void InterpreterMacroAssembler::push_ptr(Register r) {

   if (TaggedStackInterpreter) pushq(frame::TagReference);

   pushq(r);

 }

 void InterpreterMacroAssembler::push_ptr(Register r, Register tag) {

   if (TaggedStackInterpreter) pushq(tag);

   pushq(r);

 }

 void InterpreterMacroAssembler::push_i(Register r) {

   if (TaggedStackInterpreter) pushq(frame::TagValue);

   pushq(r);

 }

 void InterpreterMacroAssembler::push_l(Register r) {

   if (TaggedStackInterpreter) {

     pushq(frame::TagValue);

     subq(rsp, 1 * wordSize);

     pushq(frame::TagValue);

     subq(rsp, 1 * wordSize);

   } else {

     subq(rsp, 2 * wordSize);

   }

   movq(Address(rsp, 0), r);

 }

 void InterpreterMacroAssembler::push_f(XMMRegister r) {

   if (TaggedStackInterpreter) pushq(frame::TagValue);

   subq(rsp, wordSize);

   movflt(Address(rsp, 0), r);

 }

 void InterpreterMacroAssembler::push_d(XMMRegister r) {

   if (TaggedStackInterpreter) {

     pushq(frame::TagValue);

     subq(rsp, 1 * wordSize);

     pushq(frame::TagValue);

     subq(rsp, 1 * wordSize);

   } else {

     subq(rsp, 2 * wordSize);

   }

   movdbl(Address(rsp, 0), r);

 }

 void InterpreterMacroAssembler::pop(TosState state) {

   switch (state) {

   case atos: pop_ptr();                 break;

   case btos:

   case ctos:

   case stos:

   case itos: pop_i();                   break;

   case ltos: pop_l();                   break;

   case ftos: pop_f();                   break;

   case dtos: pop_d();                   break;

   case vtos: /* nothing to do */        break;

   default:   ShouldNotReachHere();

   }

   verify_oop(rax, state);

 }

 void InterpreterMacroAssembler::push(TosState state) {

   verify_oop(rax, state);

   switch (state) {

   case atos: push_ptr();                break;

   case btos:

   case ctos:

   case stos:

   case itos: push_i();                  break;

   case ltos: push_l();                  break;

   case ftos: push_f();                  break;

   case dtos: push_d();                  break;

   case vtos: /* nothing to do */        break;

   default  : ShouldNotReachHere();

   }

 }

 // Tagged stack helpers for swap and dup

 void InterpreterMacroAssembler::load_ptr_and_tag(int n, Register val,

                                                  Register tag) {

   movq(val, Address(rsp, Interpreter::expr_offset_in_bytes(n)));

   if (TaggedStackInterpreter) {

     movq(tag, Address(rsp, Interpreter::expr_tag_offset_in_bytes(n)));

   }

 }

 void InterpreterMacroAssembler::store_ptr_and_tag(int n, Register val,

                                                   Register tag) {

   movq(Address(rsp, Interpreter::expr_offset_in_bytes(n)), val);

   if (TaggedStackInterpreter) {

     movq(Address(rsp, Interpreter::expr_tag_offset_in_bytes(n)), tag);

   }

 }

 // Tagged local support

 void InterpreterMacroAssembler::tag_local(frame::Tag tag, int n) {

   if (TaggedStackInterpreter) {

     if (tag == frame::TagCategory2) {

       mov64(Address(r14, Interpreter::local_tag_offset_in_bytes(n+1)),

            (intptr_t)frame::TagValue);

       mov64(Address(r14, Interpreter::local_tag_offset_in_bytes(n)),

            (intptr_t)frame::TagValue);

     } else {

       mov64(Address(r14, Interpreter::local_tag_offset_in_bytes(n)), (intptr_t)tag);

     }

   }

 }

 void InterpreterMacroAssembler::tag_local(frame::Tag tag, Register idx) {

   if (TaggedStackInterpreter) {

     if (tag == frame::TagCategory2) {

       mov64(Address(r14, idx, Address::times_8,

                   Interpreter::local_tag_offset_in_bytes(1)), (intptr_t)frame::TagValue);

       mov64(Address(r14, idx, Address::times_8,

                   Interpreter::local_tag_offset_in_bytes(0)), (intptr_t)frame::TagValue);

     } else {

       mov64(Address(r14, idx, Address::times_8, Interpreter::local_tag_offset_in_bytes(0)),

            (intptr_t)tag);

     }

   }

 }

 void InterpreterMacroAssembler::tag_local(Register tag, Register idx) {

   if (TaggedStackInterpreter) {

     // can only be TagValue or TagReference

     movq(Address(r14, idx, Address::times_8, Interpreter::local_tag_offset_in_bytes(0)), tag);

   }

 }

 void InterpreterMacroAssembler::tag_local(Register tag, int n) {

   if (TaggedStackInterpreter) {

     // can only be TagValue or TagReference

     movq(Address(r14, Interpreter::local_tag_offset_in_bytes(n)), tag);

   }

 }

 #ifdef ASSERT

 void InterpreterMacroAssembler::verify_local_tag(frame::Tag tag, int n) {

   if (TaggedStackInterpreter) {

      frame::Tag t = tag;

     if (tag == frame::TagCategory2) {

       Label nbl;

       t = frame::TagValue;  // change to what is stored in locals

       cmpq(Address(r14, Interpreter::local_tag_offset_in_bytes(n+1)), (int)t);

       jcc(Assembler::equal, nbl);

       stop("Local tag is bad for long/double");

       bind(nbl);

     }

     Label notBad;

     cmpq(Address(r14, Interpreter::local_tag_offset_in_bytes(n)), (int)t);

     jcc(Assembler::equal, notBad);

     // Also compare if the local value is zero, then the tag might

     // not have been set coming from deopt.

     cmpq(Address(r14, Interpreter::local_offset_in_bytes(n)), 0);

     jcc(Assembler::equal, notBad);

     stop("Local tag is bad");

     bind(notBad);

   }

 }

 void InterpreterMacroAssembler::verify_local_tag(frame::Tag tag, Register idx) {

   if (TaggedStackInterpreter) {

     frame::Tag t = tag;

     if (tag == frame::TagCategory2) {

       Label nbl;

       t = frame::TagValue;  // change to what is stored in locals

       cmpq(Address(r14, idx, Address::times_8, Interpreter::local_tag_offset_in_bytes(1)), (int)t);

       jcc(Assembler::equal, nbl);

       stop("Local tag is bad for long/double");

       bind(nbl);

     }

     Label notBad;

     cmpq(Address(r14, idx, Address::times_8, Interpreter::local_tag_offset_in_bytes(0)), (int)t);

     jcc(Assembler::equal, notBad);

     // Also compare if the local value is zero, then the tag might

     // not have been set coming from deopt.

     cmpq(Address(r14, idx, Address::times_8, Interpreter::local_offset_in_bytes(0)), 0);

     jcc(Assembler::equal, notBad);

     stop("Local tag is bad");

     bind(notBad);

   }

 }

 #endif // ASSERT

 void InterpreterMacroAssembler::super_call_VM_leaf(address entry_point) {

   MacroAssembler::call_VM_leaf_base(entry_point, 0);

 }

 void InterpreterMacroAssembler::super_call_VM_leaf(address entry_point,

                                                    Register arg_1) {

   if (c_rarg0 != arg_1) {

     movq(c_rarg0, arg_1);

   }

   MacroAssembler::call_VM_leaf_base(entry_point, 1);

 }

 void InterpreterMacroAssembler::super_call_VM_leaf(address entry_point,

                                                    Register arg_1,

                                                    Register arg_2) {

   assert(c_rarg0 != arg_2, "smashed argument");

   assert(c_rarg1 != arg_1, "smashed argument");

   if (c_rarg0 != arg_1) {

     movq(c_rarg0, arg_1);

   }

   if (c_rarg1 != arg_2) {

     movq(c_rarg1, arg_2);

   }

   MacroAssembler::call_VM_leaf_base(entry_point, 2);

 }

 void InterpreterMacroAssembler::super_call_VM_leaf(address entry_point,

                                                    Register arg_1,

                                                    Register arg_2,

                                                    Register arg_3) {

   assert(c_rarg0 != arg_2, "smashed argument");

   assert(c_rarg0 != arg_3, "smashed argument");

   assert(c_rarg1 != arg_1, "smashed argument");

   assert(c_rarg1 != arg_3, "smashed argument");

   assert(c_rarg2 != arg_1, "smashed argument");

   assert(c_rarg2 != arg_2, "smashed argument");

   if (c_rarg0 != arg_1) {

     movq(c_rarg0, arg_1);

   }

   if (c_rarg1 != arg_2) {

     movq(c_rarg1, arg_2);

   }

   if (c_rarg2 != arg_3) {

     movq(c_rarg2, arg_3);

   }

   MacroAssembler::call_VM_leaf_base(entry_point, 3);

 }

 // Jump to from_interpreted entry of a call unless single stepping is possible

 // in this thread in which case we must call the i2i entry

 void InterpreterMacroAssembler::jump_from_interpreted(Register method, Register temp) {

   // set sender sp

   leaq(r13, Address(rsp, wordSize));

   // record last_sp

   movq(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), r13);

   if (JvmtiExport::can_post_interpreter_events()) {

     Label run_compiled_code;

     // JVMTI events, such as single-stepping, are implemented partly by avoiding running

     // compiled code in threads for which the event is enabled.  Check here for

     // interp_only_mode if these events CAN be enabled.

     get_thread(temp);

     // interp_only is an int, on little endian it is sufficient to test the byte only

     // Is a cmpl faster (ce

     cmpb(Address(temp, JavaThread::interp_only_mode_offset()), 0);

     jcc(Assembler::zero, run_compiled_code);

     jmp(Address(method, methodOopDesc::interpreter_entry_offset()));

     bind(run_compiled_code);

   }

   jmp(Address(method, methodOopDesc::from_interpreted_offset()));

 }

 // The following two routines provide a hook so that an implementation

 // can schedule the dispatch in two parts.  amd64 does not do this.

 void InterpreterMacroAssembler::dispatch_prolog(TosState state, int step) {

   // Nothing amd64 specific to be done here

 }

 void InterpreterMacroAssembler::dispatch_epilog(TosState state, int step) {

   dispatch_next(state, step);

 }

 void InterpreterMacroAssembler::dispatch_base(TosState state,

                                               address* table,

                                               bool verifyoop) {

   verify_FPU(1, state);

   if (VerifyActivationFrameSize) {

     Label L;

     movq(rcx, rbp);

     subq(rcx, rsp);

     int min_frame_size =

       (frame::link_offset - frame::interpreter_frame_initial_sp_offset) *

       wordSize;

     cmpq(rcx, min_frame_size);

     jcc(Assembler::greaterEqual, L);

     stop("broken stack frame");

     bind(L);

   }

   if (verifyoop) {

     verify_oop(rax, state);

   }

   lea(rscratch1, ExternalAddress((address)table));

   jmp(Address(rscratch1, rbx, Address::times_8));

 }

 void InterpreterMacroAssembler::dispatch_only(TosState state) {

   dispatch_base(state, Interpreter::dispatch_table(state));

 }

 void InterpreterMacroAssembler::dispatch_only_normal(TosState state) {

   dispatch_base(state, Interpreter::normal_table(state));

 }

 void InterpreterMacroAssembler::dispatch_only_noverify(TosState state) {

   dispatch_base(state, Interpreter::normal_table(state), false);

 }

 void InterpreterMacroAssembler::dispatch_next(TosState state, int step) {

   // load next bytecode (load before advancing r13 to prevent AGI)

   load_unsigned_byte(rbx, Address(r13, step));

   // advance r13

   incrementq(r13, step);

   dispatch_base(state, Interpreter::dispatch_table(state));

 }

 void InterpreterMacroAssembler::dispatch_via(TosState state, address* table) {

   // load current bytecode

   load_unsigned_byte(rbx, Address(r13, 0));

   dispatch_base(state, table);

 }

 // remove activation

 //

 // Unlock the receiver if this is a synchronized method.

 // Unlock any Java monitors from syncronized blocks.

 // Remove the activation from the stack.

 //

 // If there are locked Java monitors

 //    If throw_monitor_exception

 //       throws IllegalMonitorStateException

 //    Else if install_monitor_exception

 //       installs IllegalMonitorStateException

 //    Else

 //       no error processing

 void InterpreterMacroAssembler::remove_activation(

         TosState state,

         Register ret_addr,

         bool throw_monitor_exception,

         bool install_monitor_exception,

         bool notify_jvmdi) {

   // Note: Registers rdx xmm0 may be in use for the

   // result check if synchronized method

   Label unlocked, unlock, no_unlock;

   // get the value of _do_not_unlock_if_synchronized into rdx

   const Address do_not_unlock_if_synchronized(r15_thread,

     in_bytes(JavaThread::do_not_unlock_if_synchronized_offset()));

   movbool(rdx, do_not_unlock_if_synchronized);

   movbool(do_not_unlock_if_synchronized, false); // reset the flag

  // get method access flags

   movq(rbx, Address(rbp, frame::interpreter_frame_method_offset * wordSize));

   movl(rcx, Address(rbx, methodOopDesc::access_flags_offset()));

   testl(rcx, JVM_ACC_SYNCHRONIZED);

   jcc(Assembler::zero, unlocked);

   // Don't unlock anything if the _do_not_unlock_if_synchronized flag

   // is set.

   testbool(rdx);

   jcc(Assembler::notZero, no_unlock);

   // unlock monitor

   push(state); // save result

   // BasicObjectLock will be first in list, since this is a

   // synchronized method. However, need to check that the object has

   // not been unlocked by an explicit monitorexit bytecode.

   const Address monitor(rbp, frame::interpreter_frame_initial_sp_offset *

                         wordSize - (int) sizeof(BasicObjectLock));

   // We use c_rarg1 so that if we go slow path it will be the correct

   // register for unlock_object to pass to VM directly

   leaq(c_rarg1, monitor); // address of first monitor

   movq(rax, Address(c_rarg1, BasicObjectLock::obj_offset_in_bytes()));

   testq(rax, rax);

   jcc(Assembler::notZero, unlock);

   pop(state);

   if (throw_monitor_exception) {

     // Entry already unlocked, need to throw exception

     call_VM(noreg, CAST_FROM_FN_PTR(address,

                    InterpreterRuntime::throw_illegal_monitor_state_exception));

     should_not_reach_here();

   } else {

     // Monitor already unlocked during a stack unroll. If requested,

     // install an illegal_monitor_state_exception.  Continue with

     // stack unrolling.

     if (install_monitor_exception) {

       call_VM(noreg, CAST_FROM_FN_PTR(address,

                      InterpreterRuntime::new_illegal_monitor_state_exception));

     }

     jmp(unlocked);

   }

   bind(unlock);

   unlock_object(c_rarg1);

   pop(state);

   // Check that for block-structured locking (i.e., that all locked

   // objects has been unlocked)

   bind(unlocked);

   // rax: Might contain return value

   // Check that all monitors are unlocked

   {

     Label loop, exception, entry, restart;

     const int entry_size = frame::interpreter_frame_monitor_size() * wordSize;

     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);

     bind(restart);

     // We use c_rarg1 so that if we go slow path it will be the correct

     // register for unlock_object to pass to VM directly

     movq(c_rarg1, monitor_block_top); // points to current entry, starting

                                   // with top-most entry

     leaq(rbx, monitor_block_bot); // points to word before bottom of

                                   // monitor block

     jmp(entry);

     // Entry already locked, need to throw exception

     bind(exception);

     if (throw_monitor_exception) {

       // Throw exception

       MacroAssembler::call_VM(noreg,

                               CAST_FROM_FN_PTR(address, InterpreterRuntime::

                                    throw_illegal_monitor_state_exception));

       should_not_reach_here();

     } else {

       // Stack unrolling. Unlock object and install illegal_monitor_exception.

       // Unlock does not block, so don't have to worry about the frame.

       // We don't have to preserve c_rarg1 since we are going to throw an exception.

       push(state);

       unlock_object(c_rarg1);

       pop(state);

       if (install_monitor_exception) {

         call_VM(noreg, CAST_FROM_FN_PTR(address,

                                         InterpreterRuntime::

                                         new_illegal_monitor_state_exception));

       }

       jmp(restart);

     }

     bind(loop);

     // check if current entry is used

     cmpq(Address(c_rarg1, BasicObjectLock::obj_offset_in_bytes()), (int) NULL);

     jcc(Assembler::notEqual, exception);

     addq(c_rarg1, entry_size); // otherwise advance to next entry

     bind(entry);

     cmpq(c_rarg1, rbx); // check if bottom reached

     jcc(Assembler::notEqual, loop); // if not at bottom then check this entry

   }

   bind(no_unlock);

   // jvmti support

   if (notify_jvmdi) {

     notify_method_exit(state, NotifyJVMTI);    // preserve TOSCA

   } else {

     notify_method_exit(state, SkipNotifyJVMTI); // preserve TOSCA

   }

   // remove activation

   // get sender sp

   movq(rbx,

        Address(rbp, frame::interpreter_frame_sender_sp_offset * wordSize));

   leave();                           // remove frame anchor

   popq(ret_addr);                    // get return address

   movq(rsp, rbx);                    // set sp to sender sp

 }

 // Lock object

 //

 // Args:

 //      c_rarg1: BasicObjectLock to be used for locking

 //

 // Kills:

 //      rax

 //      c_rarg0, c_rarg1, c_rarg2, c_rarg3, .. (param regs)

 //      rscratch1, rscratch2 (scratch regs)

 void InterpreterMacroAssembler::lock_object(Register lock_reg) {

   assert(lock_reg == c_rarg1, "The argument is only for looks. It must be c_rarg1");

   if (UseHeavyMonitors) {

     call_VM(noreg,

             CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorenter),

             lock_reg);

   } else {

     Label done;

     const Register swap_reg = rax; // Must use rax for cmpxchg instruction

     const Register obj_reg = c_rarg3; // Will contain the oop

     const int obj_offset = BasicObjectLock::obj_offset_in_bytes();

     const int lock_offset = BasicObjectLock::lock_offset_in_bytes ();

     const int mark_offset = lock_offset +

                             BasicLock::displaced_header_offset_in_bytes();

     Label slow_case;

     // Load object pointer into obj_reg %c_rarg3

     movq(obj_reg, Address(lock_reg, obj_offset));

     if (UseBiasedLocking) {

       biased_locking_enter(lock_reg, obj_reg, swap_reg, rscratch1, false, done, &slow_case);

     }

     // Load immediate 1 into swap_reg %rax

     movl(swap_reg, 1);

     // Load (object->mark() | 1) into swap_reg %rax

     orq(swap_reg, Address(obj_reg, 0));

     // Save (object->mark() | 1) into BasicLock's displaced header

     movq(Address(lock_reg, mark_offset), swap_reg);

     assert(lock_offset == 0,

            "displached header must be first word in BasicObjectLock");

     if (os::is_MP()) lock();

     cmpxchgq(lock_reg, Address(obj_reg, 0));

     if (PrintBiasedLockingStatistics) {

       cond_inc32(Assembler::zero,

                  ExternalAddress((address) BiasedLocking::fast_path_entry_count_addr()));

     }

     jcc(Assembler::zero, done);

     // Test if the oopMark is an obvious stack pointer, i.e.,

     //  1) (mark & 7) == 0, and

     //  2) rsp <= mark < mark + os::pagesize()

     //

     // These 3 tests can be done by evaluating the following

     // expression: ((mark - rsp) & (7 - os::vm_page_size())),

     // assuming both stack pointer and pagesize have their

     // least significant 3 bits clear.

     // NOTE: the oopMark is in swap_reg %rax as the result of cmpxchg

     subq(swap_reg, rsp);

     andq(swap_reg, 7 - os::vm_page_size());

     // Save the test result, for recursive case, the result is zero

     movq(Address(lock_reg, mark_offset), swap_reg);

     if (PrintBiasedLockingStatistics) {

       cond_inc32(Assembler::zero,

                  ExternalAddress((address) BiasedLocking::fast_path_entry_count_addr()));

     }

     jcc(Assembler::zero, done);

     bind(slow_case);

     // Call the runtime routine for slow case

     call_VM(noreg,

             CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorenter),

             lock_reg);

     bind(done);

   }

 }

 // Unlocks an object. Used in monitorexit bytecode and

 // remove_activation.  Throws an IllegalMonitorException if object is

 // not locked by current thread.

 //

 // Args:

 //      c_rarg1: BasicObjectLock for lock

 //

 // Kills:

 //      rax

 //      c_rarg0, c_rarg1, c_rarg2, c_rarg3, ... (param regs)

 //      rscratch1, rscratch2 (scratch regs)

 void InterpreterMacroAssembler::unlock_object(Register lock_reg) {

   assert(lock_reg == c_rarg1, "The argument is only for looks. It must be rarg1");

   if (UseHeavyMonitors) {

     call_VM(noreg,

             CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorexit),

             lock_reg);

   } else {

     Label done;

     const Register swap_reg   = rax;  // Must use rax for cmpxchg instruction

     const Register header_reg = c_rarg2;  // Will contain the old oopMark

     const Register obj_reg    = c_rarg3;  // Will contain the oop

     save_bcp(); // Save in case of exception

     // Convert from BasicObjectLock structure to object and BasicLock

     // structure Store the BasicLock address into %rax

     leaq(swap_reg, Address(lock_reg, BasicObjectLock::lock_offset_in_bytes()));

     // Load oop into obj_reg(%c_rarg3)

     movq(obj_reg, Address(lock_reg, BasicObjectLock::obj_offset_in_bytes()));

     // Free entry

     movptr(Address(lock_reg, BasicObjectLock::obj_offset_in_bytes()), NULL_WORD);

     if (UseBiasedLocking) {

       biased_locking_exit(obj_reg, header_reg, done);

     }

     // Load the old header from BasicLock structure

     movq(header_reg, Address(swap_reg,

                              BasicLock::displaced_header_offset_in_bytes()));

     // Test for recursion

     testq(header_reg, header_reg);

     // zero for recursive case

     jcc(Assembler::zero, done);

     // Atomic swap back the old header

     if (os::is_MP()) lock();

     cmpxchgq(header_reg, Address(obj_reg, 0));

     // zero for recursive case

     jcc(Assembler::zero, done);

     // Call the runtime routine for slow case.

     movq(Address(lock_reg, BasicObjectLock::obj_offset_in_bytes()),

          obj_reg); // restore obj

     call_VM(noreg,

             CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorexit),

             lock_reg);

     bind(done);

     restore_bcp();

   }

 }

 void InterpreterMacroAssembler::test_method_data_pointer(Register mdp,

                                                          Label& zero_continue) {

   assert(ProfileInterpreter, "must be profiling interpreter");

   movq(mdp, Address(rbp, frame::interpreter_frame_mdx_offset * wordSize));

   testq(mdp, mdp);

   jcc(Assembler::zero, zero_continue);

 }

 // Set the method data pointer for the current bcp.

 void InterpreterMacroAssembler::set_method_data_pointer_for_bcp() {

   assert(ProfileInterpreter, "must be profiling interpreter");

   Label zero_continue;

   pushq(rax);

   pushq(rbx);

   get_method(rbx);

   // Test MDO to avoid the call if it is NULL.

   movq(rax, Address(rbx, in_bytes(methodOopDesc::method_data_offset())));

   testq(rax, rax);

   jcc(Assembler::zero, zero_continue);

   // rbx: method

   // r13: bcp

   call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::bcp_to_di), rbx, r13);

   // rax: mdi

   movq(rbx, Address(rbx, in_bytes(methodOopDesc::method_data_offset())));

   testq(rbx, rbx);

   jcc(Assembler::zero, zero_continue);

   addq(rbx, in_bytes(methodDataOopDesc::data_offset()));

   addq(rbx, rax);

   movq(Address(rbp, frame::interpreter_frame_mdx_offset * wordSize), rbx);

   bind(zero_continue);

   popq(rbx);

   popq(rax);

 }

 void InterpreterMacroAssembler::verify_method_data_pointer() {

   assert(ProfileInterpreter, "must be profiling interpreter");

 #ifdef ASSERT

   Label verify_continue;

   pushq(rax);

   pushq(rbx);

   pushq(c_rarg3);

   pushq(c_rarg2);

   test_method_data_pointer(c_rarg3, verify_continue); // If mdp is zero, continue

   get_method(rbx);

   // If the mdp is valid, it will point to a DataLayout header which is

   // consistent with the bcp.  The converse is highly probable also.

   load_unsigned_word(c_rarg2,

                      Address(c_rarg3, in_bytes(DataLayout::bci_offset())));

   addq(c_rarg2, Address(rbx, methodOopDesc::const_offset()));

   leaq(c_rarg2, Address(c_rarg2, constMethodOopDesc::codes_offset()));

   cmpq(c_rarg2, r13);

   jcc(Assembler::equal, verify_continue);

   // rbx: method

   // r13: bcp

   // c_rarg3: mdp

   call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::verify_mdp),

                rbx, r13, c_rarg3);

   bind(verify_continue);

   popq(c_rarg2);

   popq(c_rarg3);

   popq(rbx);

   popq(rax);

 #endif // ASSERT

 }

 void InterpreterMacroAssembler::set_mdp_data_at(Register mdp_in,

                                                 int constant,

                                                 Register value) {

   assert(ProfileInterpreter, "must be profiling interpreter");

   Address data(mdp_in, constant);

   movq(data, value);

 }

 void InterpreterMacroAssembler::increment_mdp_data_at(Register mdp_in,

                                                       int constant,

                                                       bool decrement) {

   // Counter address

   Address data(mdp_in, constant);

   increment_mdp_data_at(data, decrement);

 }

 void InterpreterMacroAssembler::increment_mdp_data_at(Address data,

                                                       bool decrement) {

   assert(ProfileInterpreter, "must be profiling interpreter");

   if (decrement) {

     // Decrement the register.  Set condition codes.

     addq(data, -DataLayout::counter_increment);

     // If the decrement causes the counter to overflow, stay negative

     Label L;

     jcc(Assembler::negative, L);

     addq(data, DataLayout::counter_increment);

     bind(L);

   } else {

     assert(DataLayout::counter_increment == 1,

            "flow-free idiom only works with 1");

     // Increment the register.  Set carry flag.

     addq(data, DataLayout::counter_increment);

     // If the increment causes the counter to overflow, pull back by 1.

     sbbq(data, 0);

   }

 }

 void InterpreterMacroAssembler::increment_mdp_data_at(Register mdp_in,

                                                       Register reg,

                                                       int constant,

                                                       bool decrement) {

   Address data(mdp_in, reg, Address::times_1, constant);

   increment_mdp_data_at(data, decrement);

 }

 void InterpreterMacroAssembler::set_mdp_flag_at(Register mdp_in,

                                                 int flag_byte_constant) {

   assert(ProfileInterpreter, "must be profiling interpreter");

   int header_offset = in_bytes(DataLayout::header_offset());

   int header_bits = DataLayout::flag_mask_to_header_mask(flag_byte_constant);

   // Set the flag

   orl(Address(mdp_in, header_offset), header_bits);

 }

 void InterpreterMacroAssembler::test_mdp_data_at(Register mdp_in,

                                                  int offset,

                                                  Register value,

                                                  Register test_value_out,

                                                  Label& not_equal_continue) {

   assert(ProfileInterpreter, "must be profiling interpreter");

   if (test_value_out == noreg) {

     cmpq(value, Address(mdp_in, offset));

   } else {

     // Put the test value into a register, so caller can use it:

     movq(test_value_out, Address(mdp_in, offset));

     cmpq(test_value_out, value);

   }

   jcc(Assembler::notEqual, not_equal_continue);

 }

 void InterpreterMacroAssembler::update_mdp_by_offset(Register mdp_in,

                                                      int offset_of_disp) {

   assert(ProfileInterpreter, "must be profiling interpreter");

   Address disp_address(mdp_in, offset_of_disp);

   addq(mdp_in, disp_address);

   movq(Address(rbp, frame::interpreter_frame_mdx_offset * wordSize), mdp_in);

 }

 void InterpreterMacroAssembler::update_mdp_by_offset(Register mdp_in,

                                                      Register reg,

                                                      int offset_of_disp) {

   assert(ProfileInterpreter, "must be profiling interpreter");

   Address disp_address(mdp_in, reg, Address::times_1, offset_of_disp);

   addq(mdp_in, disp_address);

   movq(Address(rbp, frame::interpreter_frame_mdx_offset * wordSize), mdp_in);

 }

 void InterpreterMacroAssembler::update_mdp_by_constant(Register mdp_in,

                                                        int constant) {

   assert(ProfileInterpreter, "must be profiling interpreter");

   addq(mdp_in, constant);

   movq(Address(rbp, frame::interpreter_frame_mdx_offset * wordSize), mdp_in);

 }

 void InterpreterMacroAssembler::update_mdp_for_ret(Register return_bci) {

   assert(ProfileInterpreter, "must be profiling interpreter");

   pushq(return_bci); // save/restore across call_VM

   call_VM(noreg,

           CAST_FROM_FN_PTR(address, InterpreterRuntime::update_mdp_for_ret),

           return_bci);

   popq(return_bci);

 }

 void InterpreterMacroAssembler::profile_taken_branch(Register mdp,

                                                      Register bumped_count) {

   if (ProfileInterpreter) {

     Label profile_continue;

     // If no method data exists, go to profile_continue.

     // Otherwise, assign to mdp

     test_method_data_pointer(mdp, profile_continue);

     // We are taking a branch.  Increment the taken count.

     // We inline increment_mdp_data_at to return bumped_count in a register

     //increment_mdp_data_at(mdp, in_bytes(JumpData::taken_offset()));

     Address data(mdp, in_bytes(JumpData::taken_offset()));

     movq(bumped_count, data);

     assert(DataLayout::counter_increment == 1,

             "flow-free idiom only works with 1");

     addq(bumped_count, DataLayout::counter_increment);

     sbbq(bumped_count, 0);

     movq(data, bumped_count); // Store back out

     // The method data pointer needs to be updated to reflect the new target.

     update_mdp_by_offset(mdp, in_bytes(JumpData::displacement_offset()));

     bind(profile_continue);

   }

 }

 void InterpreterMacroAssembler::profile_not_taken_branch(Register mdp) {

   if (ProfileInterpreter) {

     Label profile_continue;

     // If no method data exists, go to profile_continue.

     test_method_data_pointer(mdp, profile_continue);

     // We are taking a branch.  Increment the not taken count.

     increment_mdp_data_at(mdp, in_bytes(BranchData::not_taken_offset()));

     // The method data pointer needs to be updated to correspond to

     // the next bytecode

     update_mdp_by_constant(mdp, in_bytes(BranchData::branch_data_size()));

     bind(profile_continue);

   }

 }

 void InterpreterMacroAssembler::profile_call(Register mdp) {

   if (ProfileInterpreter) {

     Label profile_continue;

     // If no method data exists, go to profile_continue.

     test_method_data_pointer(mdp, profile_continue);

     // We are making a call.  Increment the count.

     increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset()));

     // The method data pointer needs to be updated to reflect the new target.

     update_mdp_by_constant(mdp, in_bytes(CounterData::counter_data_size()));

     bind(profile_continue);

   }

 }

 void InterpreterMacroAssembler::profile_final_call(Register mdp) {

   if (ProfileInterpreter) {

     Label profile_continue;

     // If no method data exists, go to profile_continue.

     test_method_data_pointer(mdp, profile_continue);

     // We are making a call.  Increment the count.

     increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset()));

     // The method data pointer needs to be updated to reflect the new target.

     update_mdp_by_constant(mdp,

                            in_bytes(VirtualCallData::

                                     virtual_call_data_size()));

     bind(profile_continue);

   }

 }

 void InterpreterMacroAssembler::profile_virtual_call(Register receiver,

                                                      Register mdp,

                                                      Register reg2) {

   if (ProfileInterpreter) {

     Label profile_continue;

     // If no method data exists, go to profile_continue.

     test_method_data_pointer(mdp, profile_continue);

     // We are making a call.  Increment the count.

     increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset()));

     // Record the receiver type.

     record_klass_in_profile(receiver, mdp, reg2);

     // The method data pointer needs to be updated to reflect the new target.

     update_mdp_by_constant(mdp,

                            in_bytes(VirtualCallData::

                                     virtual_call_data_size()));

     bind(profile_continue);

   }

 }

 // This routine creates a state machine for updating the multi-row

 // type profile at a virtual call site (or other type-sensitive bytecode).

 // The machine visits each row (of receiver/count) until the receiver type

 // is found, or until it runs out of rows.  At the same time, it remembers

 // the location of the first empty row.  (An empty row records null for its

 // receiver, and can be allocated for a newly-observed receiver type.)

 // Because there are two degrees of freedom in the state, a simple linear

 // search will not work; it must be a decision tree.  Hence this helper

 // function is recursive, to generate the required tree structured code.

 // It's the interpreter, so we are trading off code space for speed.

 // See below for example code.

 void InterpreterMacroAssembler::record_klass_in_profile_helper(

                                         Register receiver, Register mdp,

                                         Register reg2,

                                         int start_row, Label& done) {

   int last_row = VirtualCallData::row_limit() - 1;

   assert(start_row <= last_row, "must be work left to do");

   // Test this row for both the receiver and for null.

   // Take any of three different outcomes:

   //   1. found receiver => increment count and goto done

   //   2. found null => keep looking for case 1, maybe allocate this cell

   //   3. found something else => keep looking for cases 1 and 2

   // Case 3 is handled by a recursive call.

   for (int row = start_row; row <= last_row; row++) {

     Label next_test;

     bool test_for_null_also = (row == start_row);

     // See if the receiver is receiver[n].

     int recvr_offset = in_bytes(VirtualCallData::receiver_offset(row));

     test_mdp_data_at(mdp, recvr_offset, receiver,

                      (test_for_null_also ? reg2 : noreg),

                      next_test);

     // (Reg2 now contains the receiver from the CallData.)

     // The receiver is receiver[n].  Increment count[n].

     int count_offset = in_bytes(VirtualCallData::receiver_count_offset(row));

     increment_mdp_data_at(mdp, count_offset);

     jmp(done);

     bind(next_test);

     if (test_for_null_also) {

       // Failed the equality check on receiver[n]...  Test for null.

       testq(reg2, reg2);

       if (start_row == last_row) {

         // The only thing left to do is handle the null case.

         jcc(Assembler::notZero, done);

         break;

       }

       // Since null is rare, make it be the branch-taken case.

       Label found_null;

       jcc(Assembler::zero, found_null);

       // Put all the "Case 3" tests here.

       record_klass_in_profile_helper(receiver, mdp, reg2, start_row + 1, done);

       // Found a null.  Keep searching for a matching receiver,

       // but remember that this is an empty (unused) slot.

       bind(found_null);

     }

   }

   // In the fall-through case, we found no matching receiver, but we

   // observed the receiver[start_row] is NULL.

   // Fill in the receiver field and increment the count.

   int recvr_offset = in_bytes(VirtualCallData::receiver_offset(start_row));

   set_mdp_data_at(mdp, recvr_offset, receiver);

   int count_offset = in_bytes(VirtualCallData::receiver_count_offset(start_row));

   movl(reg2, DataLayout::counter_increment);

   set_mdp_data_at(mdp, count_offset, reg2);

   jmp(done);

 }

 // Example state machine code for three profile rows:

 //   // main copy of decision tree, rooted at row[1]

 //   if (row[0].rec == rec) { row[0].incr(); goto done; }

 //   if (row[0].rec != NULL) {

 //     // inner copy of decision tree, rooted at row[1]

 //     if (row[1].rec == rec) { row[1].incr(); goto done; }

 //     if (row[1].rec != NULL) {

 //       // degenerate decision tree, rooted at row[2]

 //       if (row[2].rec == rec) { row[2].incr(); goto done; }

 //       if (row[2].rec != NULL) { goto done; } // overflow

 //       row[2].init(rec); goto done;

 //     } else {

 //       // remember row[1] is empty

 //       if (row[2].rec == rec) { row[2].incr(); goto done; }

 //       row[1].init(rec); goto done;

 //     }

 //   } else {

 //     // remember row[0] is empty

 //     if (row[1].rec == rec) { row[1].incr(); goto done; }

 //     if (row[2].rec == rec) { row[2].incr(); goto done; }

 //     row[0].init(rec); goto done;

 //   }

 void InterpreterMacroAssembler::record_klass_in_profile(Register receiver,

                                                         Register mdp,

                                                         Register reg2) {

   assert(ProfileInterpreter, "must be profiling");

   Label done;

   record_klass_in_profile_helper(receiver, mdp, reg2, 0, done);

   bind (done);

 }

 void InterpreterMacroAssembler::profile_ret(Register return_bci,

                                             Register mdp) {

   if (ProfileInterpreter) {

     Label profile_continue;

     uint row;

     // If no method data exists, go to profile_continue.

     test_method_data_pointer(mdp, profile_continue);

     // Update the total ret count.

     increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset()));

     for (row = 0; row < RetData::row_limit(); row++) {

       Label next_test;

       // See if return_bci is equal to bci[n]:

       test_mdp_data_at(mdp,

                        in_bytes(RetData::bci_offset(row)),

                        return_bci, noreg,

                        next_test);

       // return_bci is equal to bci[n].  Increment the count.

       increment_mdp_data_at(mdp, in_bytes(RetData::bci_count_offset(row)));

       // The method data pointer needs to be updated to reflect the new target.

       update_mdp_by_offset(mdp,

                            in_bytes(RetData::bci_displacement_offset(row)));

       jmp(profile_continue);

       bind(next_test);

     }

     update_mdp_for_ret(return_bci);

     bind(profile_continue);

   }

 }

 void InterpreterMacroAssembler::profile_null_seen(Register mdp) {

   if (ProfileInterpreter) {

     Label profile_continue;

     // If no method data exists, go to profile_continue.

     test_method_data_pointer(mdp, profile_continue);

     // The method data pointer needs to be updated.

     int mdp_delta = in_bytes(BitData::bit_data_size());

     if (TypeProfileCasts) {

       mdp_delta = in_bytes(VirtualCallData::virtual_call_data_size());

     }

     update_mdp_by_constant(mdp, mdp_delta);

     bind(profile_continue);

   }

 }

 void InterpreterMacroAssembler::profile_typecheck_failed(Register mdp) {

   if (ProfileInterpreter && TypeProfileCasts) {

     Label profile_continue;

     // If no method data exists, go to profile_continue.

     test_method_data_pointer(mdp, profile_continue);

     int count_offset = in_bytes(CounterData::count_offset());

     // Back up the address, since we have already bumped the mdp.

     count_offset -= in_bytes(VirtualCallData::virtual_call_data_size());

     // *Decrement* the counter.  We expect to see zero or small negatives.

     increment_mdp_data_at(mdp, count_offset, true);

     bind (profile_continue);

   }

 }

 void InterpreterMacroAssembler::profile_typecheck(Register mdp, Register klass, Register reg2) {

   if (ProfileInterpreter) {

     Label profile_continue;

     // If no method data exists, go to profile_continue.

     test_method_data_pointer(mdp, profile_continue);

     // The method data pointer needs to be updated.

     int mdp_delta = in_bytes(BitData::bit_data_size());

     if (TypeProfileCasts) {

       mdp_delta = in_bytes(VirtualCallData::virtual_call_data_size());

       // Record the object type.

       record_klass_in_profile(klass, mdp, reg2);

     }

     update_mdp_by_constant(mdp, mdp_delta);

     bind(profile_continue);

   }

 }

 void InterpreterMacroAssembler::profile_switch_default(Register mdp) {

   if (ProfileInterpreter) {

     Label profile_continue;

     // If no method data exists, go to profile_continue.

     test_method_data_pointer(mdp, profile_continue);

     // Update the default case count

     increment_mdp_data_at(mdp,

                           in_bytes(MultiBranchData::default_count_offset()));

     // The method data pointer needs to be updated.

     update_mdp_by_offset(mdp,

                          in_bytes(MultiBranchData::

                                   default_displacement_offset()));

     bind(profile_continue);

   }

 }

 void InterpreterMacroAssembler::profile_switch_case(Register index,

                                                     Register mdp,

                                                     Register reg2) {

   if (ProfileInterpreter) {

     Label profile_continue;

     // If no method data exists, go to profile_continue.

     test_method_data_pointer(mdp, profile_continue);

     // Build the base (index * per_case_size_in_bytes()) +

     // case_array_offset_in_bytes()

     movl(reg2, in_bytes(MultiBranchData::per_case_size()));

     imulq(index, reg2); // XXX l ?

     addq(index, in_bytes(MultiBranchData::case_array_offset())); // XXX l ?

     // Update the case count

     increment_mdp_data_at(mdp,

                           index,

                           in_bytes(MultiBranchData::relative_count_offset()));

     // The method data pointer needs to be updated.

     update_mdp_by_offset(mdp,

                          index,

                          in_bytes(MultiBranchData::

                                   relative_displacement_offset()));

     bind(profile_continue);

   }

 }

 void InterpreterMacroAssembler::verify_oop(Register reg, TosState state) {

   if (state == atos) {

     MacroAssembler::verify_oop(reg);

   }

 }

 void InterpreterMacroAssembler::verify_FPU(int stack_depth, TosState state) {

 }

 void InterpreterMacroAssembler::notify_method_entry() {

   // Whenever JVMTI is interp_only_mode, method entry/exit events are sent to

   // track stack depth.  If it is possible to enter interp_only_mode we add

   // the code to check if the event should be sent.

   if (JvmtiExport::can_post_interpreter_events()) {

     Label L;

     movl(rdx, Address(r15_thread, JavaThread::interp_only_mode_offset()));

     testl(rdx, rdx);

     jcc(Assembler::zero, L);

     call_VM(noreg, CAST_FROM_FN_PTR(address,

                                     InterpreterRuntime::post_method_entry));

     bind(L);

   }

   {

     SkipIfEqual skip(this, &DTraceMethodProbes, false);

     get_method(c_rarg1);

     call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_entry),

                  r15_thread, c_rarg1);

   }

 }

 void InterpreterMacroAssembler::notify_method_exit(

     TosState state, NotifyMethodExitMode mode) {

   // Whenever JVMTI is interp_only_mode, method entry/exit events are sent to

   // track stack depth.  If it is possible to enter interp_only_mode we add

   // the code to check if the event should be sent.

   if (mode == NotifyJVMTI && JvmtiExport::can_post_interpreter_events()) {

     Label L;

     // Note: frame::interpreter_frame_result has a dependency on how the

     // method result is saved across the call to post_method_exit. If this

     // is changed then the interpreter_frame_result implementation will

     // need to be updated too.

     push(state);

     movl(rdx, Address(r15_thread, JavaThread::interp_only_mode_offset()));

     testl(rdx, rdx);

     jcc(Assembler::zero, L);

     call_VM(noreg,

             CAST_FROM_FN_PTR(address, InterpreterRuntime::post_method_exit));

     bind(L);

     pop(state);

   }

   {

     SkipIfEqual skip(this, &DTraceMethodProbes, false);

     push(state);

     get_method(c_rarg1);

     call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit),

                  r15_thread, c_rarg1);

     pop(state);

   }

 }