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

src/cpu/x86/vm/cppInterpreter_x86.cpp@a61af66fc99e (annotated)

src/cpu/x86/vm/cppInterpreter_x86.cpp

Sat, 01 Dec 2007 00:00:00 +0000

author: duke
date: Sat, 01 Dec 2007 00:00:00 +0000
changeset 435: a61af66fc99e
child 739: dc7f315e41f7
permissions: -rw-r--r--

Initial load

 /*
  * Copyright 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/_cppInterpreter_x86.cpp.incl"
 #ifdef CC_INTERP
 // Routine exists to make tracebacks look decent in debugger
 // while we are recursed in the frame manager/c++ interpreter.
 // We could use an address in the frame manager but having
 // frames look natural in the debugger is a plus.
 extern "C" void RecursiveInterpreterActivation(interpreterState istate )
 {
   //
   ShouldNotReachHere();
 }
 #define __ _masm->
 #define STATE(field_name) (Address(state, byte_offset_of(BytecodeInterpreter, field_name)))
 Label fast_accessor_slow_entry_path;  // fast accessor methods need to be able to jmp to unsynchronized
                                       // c++ interpreter entry point this holds that entry point label.
 // NEEDED for JVMTI?
 // address AbstractInterpreter::_remove_activation_preserving_args_entry;
 static address unctrap_frame_manager_entry  = NULL;
 static address deopt_frame_manager_return_atos  = NULL;
 static address deopt_frame_manager_return_btos  = NULL;
 static address deopt_frame_manager_return_itos  = NULL;
 static address deopt_frame_manager_return_ltos  = NULL;
 static address deopt_frame_manager_return_ftos  = NULL;
 static address deopt_frame_manager_return_dtos  = NULL;
 static address deopt_frame_manager_return_vtos  = NULL;
 int AbstractInterpreter::BasicType_as_index(BasicType type) {
   int i = 0;
   switch (type) {
     case T_BOOLEAN: i = 0; break;
     case T_CHAR   : i = 1; break;
     case T_BYTE   : i = 2; break;
     case T_SHORT  : i = 3; break;
     case T_INT    : i = 4; break;
     case T_VOID   : i = 5; break;
     case T_FLOAT  : i = 8; break;
     case T_LONG   : i = 9; break;
     case T_DOUBLE : i = 6; break;
     case T_OBJECT : // fall through
     case T_ARRAY  : i = 7; break;
     default       : ShouldNotReachHere();
   }
   assert(0 <= i && i < AbstractInterpreter::number_of_result_handlers, "index out of bounds");
   return i;
 }
 // Is this pc anywhere within code owned by the interpreter?
 // This only works for pc that might possibly be exposed to frame
 // walkers. It clearly misses all of the actual c++ interpreter
 // implementation
 bool CppInterpreter::contains(address pc)            {
     return (_code->contains(pc) ||
             pc == CAST_FROM_FN_PTR(address, RecursiveInterpreterActivation));
 }
 address CppInterpreterGenerator::generate_result_handler_for(BasicType type) {
   const Register state   = rsi;                                    // current activation object, valid on entry
   address entry = __ pc();
   switch (type) {
     case T_BOOLEAN: __ c2bool(rax);            break;
     case T_CHAR   : __ andl(rax, 0xFFFF);      break;
     case T_BYTE   : __ sign_extend_byte (rax); break;
     case T_SHORT  : __ sign_extend_short(rax); break;
     case T_VOID   : // fall thru
     case T_LONG   : // fall thru
     case T_INT    : /* nothing to do */        break;
     case T_DOUBLE :
     case T_FLOAT  :
       { const Register t = InterpreterRuntime::SignatureHandlerGenerator::temp();
         __ popl(t);                            // remove return address first
         __ pop_dtos_to_rsp();
         // Must return a result for interpreter or compiler. In SSE
         // mode, results are returned in xmm0 and the FPU stack must
         // be empty.
         if (type == T_FLOAT && UseSSE >= 1) {
           // Load ST0
           __ fld_d(Address(rsp, 0));
           // Store as float and empty fpu stack
           __ fstp_s(Address(rsp, 0));
           // and reload
           __ movflt(xmm0, Address(rsp, 0));
         } else if (type == T_DOUBLE && UseSSE >= 2 ) {
           __ movdbl(xmm0, Address(rsp, 0));
         } else {
           // restore ST0
           __ fld_d(Address(rsp, 0));
         }
         // and pop the temp
         __ addl(rsp, 2 * wordSize);
         __ pushl(t);                           // restore return address
       }
       break;
     case T_OBJECT :
       // retrieve result from frame
       __ movl(rax, STATE(_oop_temp));
       // and verify it
       __ verify_oop(rax);
       break;
     default       : ShouldNotReachHere();
   }
   __ ret(0);                                   // return from result handler
   return entry;
 }
 // tosca based result to c++ interpreter stack based result.
 // Result goes to top of native stack.
 #undef EXTEND  // SHOULD NOT BE NEEDED
 address CppInterpreterGenerator::generate_tosca_to_stack_converter(BasicType type) {
   // A result is in the tosca (abi result) from either a native method call or compiled
   // code. Place this result on the java expression stack so C++ interpreter can use it.
   address entry = __ pc();
   const Register t = InterpreterRuntime::SignatureHandlerGenerator::temp();
   __ popl(t);                            // remove return address first
   switch (type) {
     case T_VOID:
        break;
     case T_BOOLEAN:
 #ifdef EXTEND
       __ c2bool(rax);
 #endif
       __ pushl(rax);
       break;
     case T_CHAR   :
 #ifdef EXTEND
       __ andl(rax, 0xFFFF);
 #endif
       __ pushl(rax);
       break;
     case T_BYTE   :
 #ifdef EXTEND
       __ sign_extend_byte (rax);
 #endif
       __ pushl(rax);
       break;
     case T_SHORT  :
 #ifdef EXTEND
       __ sign_extend_short(rax);
 #endif
       __ pushl(rax);
       break;
     case T_LONG    :
       __ pushl(rdx);
       __ pushl(rax);
       break;
     case T_INT    :
       __ pushl(rax);
       break;
     case T_FLOAT  :
       // Result is in ST(0)
       if ( UseSSE < 1) {
         __ push(ftos);                           // and save it
       } else {
         __ subl(rsp, wordSize);
         __ movflt(Address(rsp, 0), xmm0);
       }
       break;
     case T_DOUBLE  :
       if ( UseSSE < 2 ) {
         __ push(dtos);                           // put ST0 on java stack
       } else {
         __ subl(rsp, 2*wordSize);
         __ movdbl(Address(rsp, 0), xmm0);
       }
       break;
     case T_OBJECT :
       __ verify_oop(rax);                      // verify it
       __ pushl(rax);
       break;
     default       : ShouldNotReachHere();
   }
   __ jmp(t);                                   // return from result handler
   return entry;
 }
 address CppInterpreterGenerator::generate_stack_to_stack_converter(BasicType type) {
   // A result is in the java expression stack of the interpreted method that has just
   // returned. Place this result on the java expression stack of the caller.
   //
   // The current interpreter activation in rsi is for the method just returning its
   // result. So we know that the result of this method is on the top of the current
   // execution stack (which is pre-pushed) and will be return to the top of the caller
   // stack. The top of the callers stack is the bottom of the locals of the current
   // activation.
   // Because of the way activation are managed by the frame manager the value of rsp is
   // below both the stack top of the current activation and naturally the stack top
   // of the calling activation. This enable this routine to leave the return address
   // to the frame manager on the stack and do a vanilla return.
   //
   // On entry: rsi - interpreter state of activation returning a (potential) result
   // On Return: rsi - unchanged
   //            rax - new stack top for caller activation (i.e. activation in _prev_link)
   //
   // Can destroy rdx, rcx.
   //
   address entry = __ pc();
   const Register state   = rsi;                                    // current activation object, valid on entry
   const Register t = InterpreterRuntime::SignatureHandlerGenerator::temp();
   switch (type) {
     case T_VOID:
       __ movl(rax, STATE(_locals));                                     // pop parameters get new stack value
       __ addl(rax, wordSize);                                           // account for prepush before we return
       break;
     case T_FLOAT  :
     case T_BOOLEAN:
     case T_CHAR   :
     case T_BYTE   :
     case T_SHORT  :
     case T_INT    :
       // 1 word result
       __ movl(rdx, STATE(_stack));
       __ movl(rax, STATE(_locals));                                     // address for result
       __ movl(rdx, Address(rdx, wordSize));                             // get result
       __ movl(Address(rax, 0), rdx);                                    // and store it
       break;
     case T_LONG    :
     case T_DOUBLE  :
       // return top two words on current expression stack to caller's expression stack
       // The caller's expression stack is adjacent to the current frame manager's intepretState
       // except we allocated one extra word for this intepretState so we won't overwrite it
       // when we return a two word result.
       __ movl(rax, STATE(_locals));                                     // address for result
       __ movl(rcx, STATE(_stack));
       __ subl(rax, wordSize);                                           // need addition word besides locals[0]
       __ movl(rdx, Address(rcx, 2*wordSize));                           // get result word
       __ movl(Address(rax, wordSize), rdx);                             // and store it
       __ movl(rdx, Address(rcx, wordSize));                             // get result word
       __ movl(Address(rax, 0), rdx);                                    // and store it
       break;
     case T_OBJECT :
       __ movl(rdx, STATE(_stack));
       __ movl(rax, STATE(_locals));                                     // address for result
       __ movl(rdx, Address(rdx, wordSize));                             // get result
       __ verify_oop(rdx);                                               // verify it
       __ movl(Address(rax, 0), rdx);                                    // and store it
       break;
     default       : ShouldNotReachHere();
   }
   __ ret(0);
   return entry;
 }
 address CppInterpreterGenerator::generate_stack_to_native_abi_converter(BasicType type) {
   // A result is in the java expression stack of the interpreted method that has just
   // returned. Place this result in the native abi that the caller expects.
   //
   // Similar to generate_stack_to_stack_converter above. Called at a similar time from the
   // frame manager execept in this situation the caller is native code (c1/c2/call_stub)
   // and so rather than return result onto caller's java expression stack we return the
   // result in the expected location based on the native abi.
   // On entry: rsi - interpreter state of activation returning a (potential) result
   // On Return: rsi - unchanged
   // Other registers changed [rax/rdx/ST(0) as needed for the result returned]
   address entry = __ pc();
   const Register state   = rsi;                                    // current activation object, valid on entry
   switch (type) {
     case T_VOID:
        break;
     case T_BOOLEAN:
     case T_CHAR   :
     case T_BYTE   :
     case T_SHORT  :
     case T_INT    :
       __ movl(rdx, STATE(_stack));                                      // get top of stack
       __ movl(rax, Address(rdx, wordSize));                             // get result word 1
       break;
     case T_LONG    :
       __ movl(rdx, STATE(_stack));                                      // get top of stack
       __ movl(rax, Address(rdx, wordSize));                             // get result low word
       __ movl(rdx, Address(rdx, 2*wordSize));                           // get result high word
       break;
       break;
     case T_FLOAT  :
       __ movl(rdx, STATE(_stack));                                      // get top of stack
       if ( UseSSE >= 1) {
         __ movflt(xmm0, Address(rdx, wordSize));
       } else {
         __ fld_s(Address(rdx, wordSize));                               // pushd float result
       }
       break;
     case T_DOUBLE  :
       __ movl(rdx, STATE(_stack));                                      // get top of stack
       if ( UseSSE > 1) {
         __ movdbl(xmm0, Address(rdx, wordSize));
       } else {
         __ fld_d(Address(rdx, wordSize));                               // push double result
       }
       break;
     case T_OBJECT :
       __ movl(rdx, STATE(_stack));                                      // get top of stack
       __ movl(rax, Address(rdx, wordSize));                             // get result word 1
       __ verify_oop(rax);                                               // verify it
       break;
     default       : ShouldNotReachHere();
   }
   __ ret(0);
   return entry;
 }
 address CppInterpreter::return_entry(TosState state, int length) {
   // make it look good in the debugger
   return CAST_FROM_FN_PTR(address, RecursiveInterpreterActivation);
 }
 address CppInterpreter::deopt_entry(TosState state, int length) {
   address ret = NULL;
   if (length != 0) {
     switch (state) {
       case atos: ret = deopt_frame_manager_return_atos; break;
       case btos: ret = deopt_frame_manager_return_btos; break;
       case ctos:
       case stos:
       case itos: ret = deopt_frame_manager_return_itos; break;
       case ltos: ret = deopt_frame_manager_return_ltos; break;
       case ftos: ret = deopt_frame_manager_return_ftos; break;
       case dtos: ret = deopt_frame_manager_return_dtos; break;
       case vtos: ret = deopt_frame_manager_return_vtos; break;
     }
   } else {
     ret = unctrap_frame_manager_entry;  // re-execute the bytecode ( e.g. uncommon trap)
   }
   assert(ret != NULL, "Not initialized");
   return ret;
 }
 // C++ Interpreter
 void CppInterpreterGenerator::generate_compute_interpreter_state(const Register state,
                                                                  const Register locals,
                                                                  const Register sender_sp,
                                                                  bool native) {
   // On entry the "locals" argument points to locals[0] (or where it would be in case no locals in
   // a static method). "state" contains any previous frame manager state which we must save a link
   // to in the newly generated state object. On return "state" is a pointer to the newly allocated
   // state object. We must allocate and initialize a new interpretState object and the method
   // expression stack. Because the returned result (if any) of the method will be placed on the caller's
   // expression stack and this will overlap with locals[0] (and locals[1] if double/long) we must
   // be sure to leave space on the caller's stack so that this result will not overwrite values when
   // locals[0] and locals[1] do not exist (and in fact are return address and saved rbp). So when
   // we are non-native we in essence ensure that locals[0-1] exist. We play an extra trick in
   // non-product builds and initialize this last local with the previous interpreterState as
   // this makes things look real nice in the debugger.
   // State on entry
   // Assumes locals == &locals[0]
   // Assumes state == any previous frame manager state (assuming call path from c++ interpreter)
   // Assumes rax = return address
   // rcx == senders_sp
   // rbx == method
   // Modifies rcx, rdx, rax
   // Returns:
   // state == address of new interpreterState
   // rsp == bottom of method's expression stack.
   const Address const_offset      (rbx, methodOopDesc::const_offset());
   // On entry sp is the sender's sp. This includes the space for the arguments
   // that the sender pushed. If the sender pushed no args (a static) and the
   // caller returns a long then we need two words on the sender's stack which
   // are not present (although when we return a restore full size stack the
   // space will be present). If we didn't allocate two words here then when
   // we "push" the result of the caller's stack we would overwrite the return
   // address and the saved rbp. Not good. So simply allocate 2 words now
   // just to be safe. This is the "static long no_params() method" issue.
   // See Lo.java for a testcase.
   // We don't need this for native calls because they return result in
   // register and the stack is expanded in the caller before we store
   // the results on the stack.
   if (!native) {
 #ifdef PRODUCT
     __ subl(rsp, 2*wordSize);
 #else /* PRODUCT */
     __ pushl((int)NULL);
     __ pushl(state);                         // make it look like a real argument
 #endif /* PRODUCT */
   }
   // Now that we are assure of space for stack result, setup typical linkage
   __ pushl(rax);
   __ enter();
   __ movl(rax, state);                                 // save current state
   __ leal(rsp, Address(rsp, -(int)sizeof(BytecodeInterpreter)));
   __ movl(state, rsp);
   // rsi == state/locals rax == prevstate
   // initialize the "shadow" frame so that use since C++ interpreter not directly
   // recursive. Simpler to recurse but we can't trim expression stack as we call
   // new methods.
   __ movl(STATE(_locals), locals);                      // state->_locals = locals()
   __ movl(STATE(_self_link), state);                    // point to self
   __ movl(STATE(_prev_link), rax);                      // state->_link = state on entry (NULL or previous state)
   __ movl(STATE(_sender_sp), sender_sp);                // state->_sender_sp = sender_sp
   __ get_thread(rax);                                   // get vm's javathread*
   __ movl(STATE(_thread), rax);                         // state->_bcp = codes()
   __ movl(rdx, Address(rbx, methodOopDesc::const_offset())); // get constantMethodOop
   __ leal(rdx, Address(rdx, constMethodOopDesc::codes_offset())); // get code base
   if (native) {
     __ movl(STATE(_bcp), (intptr_t)NULL);               // state->_bcp = NULL
   } else {
     __ movl(STATE(_bcp), rdx);                          // state->_bcp = codes()
   }
   __ xorl(rdx, rdx);
   __ movl(STATE(_oop_temp), rdx);                       // state->_oop_temp = NULL (only really needed for native)
   __ movl(STATE(_mdx), rdx);                            // state->_mdx = NULL
   __ movl(rdx, Address(rbx, methodOopDesc::constants_offset()));
   __ movl(rdx, Address(rdx, constantPoolOopDesc::cache_offset_in_bytes()));
   __ movl(STATE(_constants), rdx);                      // state->_constants = constants()
   __ movl(STATE(_method), rbx);                         // state->_method = method()
   __ movl(STATE(_msg), (int) BytecodeInterpreter::method_entry);   // state->_msg = initial method entry
   __ movl(STATE(_result._to_call._callee), (int) NULL); // state->_result._to_call._callee_callee = NULL
   __ movl(STATE(_monitor_base), rsp);                   // set monitor block bottom (grows down) this would point to entry [0]
                                                         // entries run from -1..x where &monitor[x] ==
   {
     // Must not attempt to lock method until we enter interpreter as gc won't be able to find the
     // initial frame. However we allocate a free monitor so we don't have to shuffle the expression stack
     // immediately.
     // synchronize method
     const Address access_flags      (rbx, methodOopDesc::access_flags_offset());
     const int entry_size            = frame::interpreter_frame_monitor_size() * wordSize;
     Label not_synced;
     __ movl(rax, access_flags);
     __ testl(rax, JVM_ACC_SYNCHRONIZED);
     __ jcc(Assembler::zero, not_synced);
     // Allocate initial monitor and pre initialize it
     // get synchronization object
     Label done;
     const int mirror_offset = klassOopDesc::klass_part_offset_in_bytes() + Klass::java_mirror_offset_in_bytes();
     __ movl(rax, access_flags);
     __ testl(rax, JVM_ACC_STATIC);
     __ movl(rax, Address(locals, 0));                     // get receiver (assume this is frequent case)
     __ jcc(Assembler::zero, done);
     __ movl(rax, Address(rbx, methodOopDesc::constants_offset()));
     __ movl(rax, Address(rax, constantPoolOopDesc::pool_holder_offset_in_bytes()));
     __ movl(rax, Address(rax, mirror_offset));
     __ bind(done);
     // add space for monitor & lock
     __ subl(rsp, entry_size);                                             // add space for a monitor entry
     __ movl(Address(rsp, BasicObjectLock::obj_offset_in_bytes()), rax);   // store object
     __ bind(not_synced);
   }
   __ movl(STATE(_stack_base), rsp);                                     // set expression stack base ( == &monitors[-count])
   if (native) {
     __ movl(STATE(_stack), rsp);                                          // set current expression stack tos
     __ movl(STATE(_stack_limit), rsp);
   } else {
     __ subl(rsp, wordSize);                                               // pre-push stack
     __ movl(STATE(_stack), rsp);                                          // set current expression stack tos
     // compute full expression stack limit
     const Address size_of_stack    (rbx, methodOopDesc::max_stack_offset());
     __ load_unsigned_word(rdx, size_of_stack);                            // get size of expression stack in words
     __ negl(rdx);                                                         // so we can subtract in next step
     // Allocate expression stack
     __ leal(rsp, Address(rsp, rdx, Address::times_4));
     __ movl(STATE(_stack_limit), rsp);
   }
 }
 // Helpers for commoning out cases in the various type of method entries.
 //
 // increment invocation count & check for overflow
 //
 // Note: checking for negative value instead of overflow
 //       so we have a 'sticky' overflow test
 //
 // rbx,: method
 // rcx: invocation counter
 //
 void InterpreterGenerator::generate_counter_incr(Label* overflow, Label* profile_method, Label* profile_method_continue) {
   const Address invocation_counter(rbx, methodOopDesc::invocation_counter_offset() + InvocationCounter::counter_offset());
   const Address backedge_counter  (rbx, methodOopDesc::backedge_counter_offset() + InvocationCounter::counter_offset());
   if (ProfileInterpreter) { // %%% Merge this into methodDataOop
     __ increment(Address(rbx,methodOopDesc::interpreter_invocation_counter_offset()));
   }
   // Update standard invocation counters
   __ movl(rax, backedge_counter);               // load backedge counter
   __ increment(rcx, InvocationCounter::count_increment);
   __ andl(rax, InvocationCounter::count_mask_value);  // mask out the status bits
   __ movl(invocation_counter, rcx);             // save invocation count
   __ addl(rcx, rax);                            // add both counters
   // profile_method is non-null only for interpreted method so
   // profile_method != NULL == !native_call
   // BytecodeInterpreter only calls for native so code is elided.
   __ cmp32(rcx,
            ExternalAddress((address)&InvocationCounter::InterpreterInvocationLimit));
   __ jcc(Assembler::aboveEqual, *overflow);
 }
 void InterpreterGenerator::generate_counter_overflow(Label* do_continue) {
   // C++ interpreter on entry
   // rsi - new interpreter state pointer
   // rbp - interpreter frame pointer
   // rbx - method
   // On return (i.e. jump to entry_point) [ back to invocation of interpreter ]
   // rbx, - method
   // rcx - rcvr (assuming there is one)
   // top of stack return address of interpreter caller
   // rsp - sender_sp
   // C++ interpreter only
   // rsi - previous interpreter state pointer
   const Address size_of_parameters(rbx, methodOopDesc::size_of_parameters_offset());
   // InterpreterRuntime::frequency_counter_overflow takes one argument
   // indicating if the counter overflow occurs at a backwards branch (non-NULL bcp).
   // The call returns the address of the verified entry point for the method or NULL
   // if the compilation did not complete (either went background or bailed out).
   __ movl(rax, (int)false);
   __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::frequency_counter_overflow), rax);
   // for c++ interpreter can rsi really be munged?
   __ leal(rsi, Address(rbp, -sizeof(BytecodeInterpreter)));                                // restore state
   __ movl(rbx, Address(rsi, byte_offset_of(BytecodeInterpreter, _method)));                // restore method
   __ movl(rdi, Address(rsi, byte_offset_of(BytecodeInterpreter, _locals)));                // get locals pointer
   // Preserve invariant that rsi/rdi contain bcp/locals of sender frame
   // and jump to the interpreted entry.
   __ jmp(*do_continue, relocInfo::none);
 }
 void InterpreterGenerator::generate_stack_overflow_check(void) {
   // see if we've got enough room on the stack for locals plus overhead.
   // the expression stack grows down incrementally, so the normal guard
   // page mechanism will work for that.
   //
   // Registers live on entry:
   //
   // Asm interpreter
   // rdx: number of additional locals this frame needs (what we must check)
   // rbx,: methodOop
   // C++ Interpreter
   // rsi: previous interpreter frame state object
   // rdi: &locals[0]
   // rcx: # of locals
   // rdx: number of additional locals this frame needs (what we must check)
   // rbx: methodOop
   // destroyed on exit
   // rax,
   // NOTE:  since the additional locals are also always pushed (wasn't obvious in
   // generate_method_entry) so the guard should work for them too.
   //
   // monitor entry size: see picture of stack set (generate_method_entry) and frame_i486.hpp
   const int entry_size    = frame::interpreter_frame_monitor_size() * wordSize;
   // total overhead size: entry_size + (saved rbp, thru expr stack bottom).
   // be sure to change this if you add/subtract anything to/from the overhead area
   const int overhead_size = (int)sizeof(BytecodeInterpreter);
   const int page_size = os::vm_page_size();
   Label after_frame_check;
   // compute rsp as if this were going to be the last frame on
   // the stack before the red zone
   Label after_frame_check_pop;
   // save rsi == caller's bytecode ptr (c++ previous interp. state)
   // QQQ problem here?? rsi overload????
   __ pushl(rsi);
   const Register thread = rsi;
   __ get_thread(thread);
   const Address stack_base(thread, Thread::stack_base_offset());
   const Address stack_size(thread, Thread::stack_size_offset());
   // locals + overhead, in bytes
     const Address size_of_stack    (rbx, methodOopDesc::max_stack_offset());
     // Always give one monitor to allow us to start interp if sync method.
     // Any additional monitors need a check when moving the expression stack
     const one_monitor = frame::interpreter_frame_monitor_size() * wordSize;
   __ load_unsigned_word(rax, size_of_stack);                            // get size of expression stack in words
   __ leal(rax, Address(noreg, rax, Interpreter::stackElementScale(), one_monitor));
   __ leal(rax, Address(rax, rdx, Interpreter::stackElementScale(), overhead_size));
 #ifdef ASSERT
   Label stack_base_okay, stack_size_okay;
   // verify that thread stack base is non-zero
   __ cmpl(stack_base, 0);
   __ jcc(Assembler::notEqual, stack_base_okay);
   __ stop("stack base is zero");
   __ bind(stack_base_okay);
   // verify that thread stack size is non-zero
   __ cmpl(stack_size, 0);
   __ jcc(Assembler::notEqual, stack_size_okay);
   __ stop("stack size is zero");
   __ bind(stack_size_okay);
 #endif
   // Add stack base to locals and subtract stack size
   __ addl(rax, stack_base);
   __ subl(rax, stack_size);
   // We should have a magic number here for the size of the c++ interpreter frame.
   // We can't actually tell this ahead of time. The debug version size is around 3k
   // product is 1k and fastdebug is 4k
   const int slop = 6 * K;
   // Use the maximum number of pages we might bang.
   const int max_pages = StackShadowPages > (StackRedPages+StackYellowPages) ? StackShadowPages :
                                                                               (StackRedPages+StackYellowPages);
   // Only need this if we are stack banging which is temporary while
   // we're debugging.
   __ addl(rax, slop + 2*max_pages * page_size);
   // check against the current stack bottom
   __ cmpl(rsp, rax);
   __ jcc(Assembler::above, after_frame_check_pop);
   __ popl(rsi);  // get saved bcp / (c++ prev state ).
      // throw exception return address becomes throwing pc
   __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_StackOverflowError));
   // all done with frame size check
   __ bind(after_frame_check_pop);
   __ popl(rsi);
   __ bind(after_frame_check);
 }
 // Find preallocated  monitor and lock method (C++ interpreter)
 // rbx - methodOop
 //
 void InterpreterGenerator::lock_method(void) {
   // assumes state == rsi == pointer to current interpreterState
   // minimally destroys rax, rdx, rdi
   //
   // synchronize method
   const Register state = rsi;
   const int entry_size            = frame::interpreter_frame_monitor_size() * wordSize;
   const Address access_flags      (rbx, methodOopDesc::access_flags_offset());
   // find initial monitor i.e. monitors[-1]
   __ movl(rdx, STATE(_monitor_base));                                   // get monitor bottom limit
   __ subl(rdx, entry_size);                                             // point to initial monitor
 #ifdef ASSERT
   { Label L;
     __ movl(rax, access_flags);
     __ testl(rax, JVM_ACC_SYNCHRONIZED);
     __ jcc(Assembler::notZero, L);
     __ stop("method doesn't need synchronization");
     __ bind(L);
   }
 #endif // ASSERT
   // get synchronization object
   { Label done;
     const int mirror_offset = klassOopDesc::klass_part_offset_in_bytes() + Klass::java_mirror_offset_in_bytes();
     __ movl(rax, access_flags);
     __ movl(rdi, STATE(_locals));                                       // prepare to get receiver (assume common case)
     __ testl(rax, JVM_ACC_STATIC);
     __ movl(rax, Address(rdi, 0));                                      // get receiver (assume this is frequent case)
     __ jcc(Assembler::zero, done);
     __ movl(rax, Address(rbx, methodOopDesc::constants_offset()));
     __ movl(rax, Address(rax, constantPoolOopDesc::pool_holder_offset_in_bytes()));
     __ movl(rax, Address(rax, mirror_offset));
     __ bind(done);
   }
 #ifdef ASSERT
   { Label L;
     __ cmpl(rax, Address(rdx, BasicObjectLock::obj_offset_in_bytes()));   // correct object?
     __ jcc(Assembler::equal, L);
     __ stop("wrong synchronization lobject");
     __ bind(L);
   }
 #endif // ASSERT
   // can destroy rax, rdx, rcx, and (via call_VM) rdi!
   __ lock_object(rdx);
 }
 // Call an accessor method (assuming it is resolved, otherwise drop into vanilla (slow path) entry
 address InterpreterGenerator::generate_accessor_entry(void) {
   // rbx,: methodOop
   // rcx: receiver (preserve for slow entry into asm interpreter)
   // rsi: senderSP must preserved for slow path, set SP to it on fast path
   Label xreturn_path;
   // do fastpath for resolved accessor methods
   if (UseFastAccessorMethods) {
     address entry_point = __ pc();
     Label slow_path;
     // If we need a safepoint check, generate full interpreter entry.
     ExternalAddress state(SafepointSynchronize::address_of_state());
     __ cmp32(ExternalAddress(SafepointSynchronize::address_of_state()),
              SafepointSynchronize::_not_synchronized);
     __ jcc(Assembler::notEqual, slow_path);
     // ASM/C++ Interpreter
     // Code: _aload_0, _(i|a)getfield, _(i|a)return or any rewrites thereof; parameter size = 1
     // Note: We can only use this code if the getfield has been resolved
     //       and if we don't have a null-pointer exception => check for
     //       these conditions first and use slow path if necessary.
     // rbx,: method
     // rcx: receiver
     __ movl(rax, Address(rsp, wordSize));
     // check if local 0 != NULL and read field
     __ testl(rax, rax);
     __ jcc(Assembler::zero, slow_path);
     __ movl(rdi, Address(rbx, methodOopDesc::constants_offset()));
     // read first instruction word and extract bytecode @ 1 and index @ 2
     __ movl(rdx, Address(rbx, methodOopDesc::const_offset()));
     __ movl(rdx, Address(rdx, constMethodOopDesc::codes_offset()));
     // Shift codes right to get the index on the right.
     // The bytecode fetched looks like <index><0xb4><0x2a>
     __ shrl(rdx, 2*BitsPerByte);
     __ shll(rdx, exact_log2(in_words(ConstantPoolCacheEntry::size())));
     __ movl(rdi, Address(rdi, constantPoolOopDesc::cache_offset_in_bytes()));
     // rax,: local 0
     // rbx,: method
     // rcx: receiver - do not destroy since it is needed for slow path!
     // rcx: scratch
     // rdx: constant pool cache index
     // rdi: constant pool cache
     // rsi: sender sp
     // check if getfield has been resolved and read constant pool cache entry
     // check the validity of the cache entry by testing whether _indices field
     // contains Bytecode::_getfield in b1 byte.
     assert(in_words(ConstantPoolCacheEntry::size()) == 4, "adjust shift below");
     __ movl(rcx,
             Address(rdi,
                     rdx,
                     Address::times_4, constantPoolCacheOopDesc::base_offset() + ConstantPoolCacheEntry::indices_offset()));
     __ shrl(rcx, 2*BitsPerByte);
     __ andl(rcx, 0xFF);
     __ cmpl(rcx, Bytecodes::_getfield);
     __ jcc(Assembler::notEqual, slow_path);
     // Note: constant pool entry is not valid before bytecode is resolved
     __ movl(rcx,
             Address(rdi,
                     rdx,
                     Address::times_4, constantPoolCacheOopDesc::base_offset() + ConstantPoolCacheEntry::f2_offset()));
     __ movl(rdx,
             Address(rdi,
                     rdx,
                     Address::times_4, constantPoolCacheOopDesc::base_offset() + ConstantPoolCacheEntry::flags_offset()));
     Label notByte, notShort, notChar;
     const Address field_address (rax, rcx, Address::times_1);
     // Need to differentiate between igetfield, agetfield, bgetfield etc.
     // because they are different sizes.
     // Use the type from the constant pool cache
     __ shrl(rdx, ConstantPoolCacheEntry::tosBits);
     // Make sure we don't need to mask rdx for tosBits after the above shift
     ConstantPoolCacheEntry::verify_tosBits();
     __ cmpl(rdx, btos);
     __ jcc(Assembler::notEqual, notByte);
     __ load_signed_byte(rax, field_address);
     __ jmp(xreturn_path);
     __ bind(notByte);
     __ cmpl(rdx, stos);
     __ jcc(Assembler::notEqual, notShort);
     __ load_signed_word(rax, field_address);
     __ jmp(xreturn_path);
     __ bind(notShort);
     __ cmpl(rdx, ctos);
     __ jcc(Assembler::notEqual, notChar);
     __ load_unsigned_word(rax, field_address);
     __ jmp(xreturn_path);
     __ bind(notChar);
 #ifdef ASSERT
     Label okay;
     __ cmpl(rdx, atos);
     __ jcc(Assembler::equal, okay);
     __ cmpl(rdx, itos);
     __ jcc(Assembler::equal, okay);
     __ stop("what type is this?");
     __ bind(okay);
 #endif // ASSERT
     // All the rest are a 32 bit wordsize
     __ movl(rax, field_address);
     __ bind(xreturn_path);
     // _ireturn/_areturn
     __ popl(rdi);                              // get return address
     __ movl(rsp, rsi);                         // set sp to sender sp
     __ jmp(rdi);
     // generate a vanilla interpreter entry as the slow path
     __ bind(slow_path);
     // We will enter c++ interpreter looking like it was
     // called by the call_stub this will cause it to return
     // a tosca result to the invoker which might have been
     // the c++ interpreter itself.
     __ jmp(fast_accessor_slow_entry_path);
     return entry_point;
   } else {
     return NULL;
   }
 }
 //
 // C++ Interpreter stub for calling a native method.
 // This sets up a somewhat different looking stack for calling the native method
 // than the typical interpreter frame setup but still has the pointer to
 // an interpreter state.
 //
 address InterpreterGenerator::generate_native_entry(bool synchronized) {
   // determine code generation flags
   bool inc_counter  = UseCompiler || CountCompiledCalls;
   // rbx: methodOop
   // rcx: receiver (unused)
   // rsi: previous interpreter state (if called from C++ interpreter) must preserve
   //      in any case. If called via c1/c2/call_stub rsi is junk (to use) but harmless
   //      to save/restore.
   address entry_point = __ pc();
   const Address size_of_parameters(rbx, methodOopDesc::size_of_parameters_offset());
   const Address size_of_locals    (rbx, methodOopDesc::size_of_locals_offset());
   const Address invocation_counter(rbx, methodOopDesc::invocation_counter_offset() + InvocationCounter::counter_offset());
   const Address access_flags      (rbx, methodOopDesc::access_flags_offset());
   // rsi == state/locals rdi == prevstate
   const Register state = rsi;
   const Register locals = rdi;
   // get parameter size (always needed)
   __ load_unsigned_word(rcx, size_of_parameters);
   // rbx: methodOop
   // rcx: size of parameters
   __ popl(rax);                                       // get return address
   // for natives the size of locals is zero
   // compute beginning of parameters /locals
   __ leal(locals, Address(rsp, rcx, Address::times_4, -wordSize));
   // initialize fixed part of activation frame
   // Assumes rax = return address
   // allocate and initialize new interpreterState and method expression stack
   // IN(locals) ->  locals
   // IN(state) -> previous frame manager state (NULL from stub/c1/c2)
   // destroys rax, rcx, rdx
   // OUT (state) -> new interpreterState
   // OUT(rsp) -> bottom of methods expression stack
   // save sender_sp
   __ movl(rcx, rsi);
   // start with NULL previous state
   __ movl(state, 0);
   generate_compute_interpreter_state(state, locals, rcx, true);
 #ifdef ASSERT
   { Label L;
     __ movl(rax, STATE(_stack_base));
     __ cmpl(rax, rsp);
     __ jcc(Assembler::equal, L);
     __ stop("broken stack frame setup in interpreter");
     __ bind(L);
   }
 #endif
   if (inc_counter) __ movl(rcx, invocation_counter);  // (pre-)fetch invocation count
   __ movl(rax, STATE(_thread));                       // get thread
   // Since at this point in the method invocation the exception handler
   // would try to exit the monitor of synchronized methods which hasn't
   // been entered yet, we set the thread local variable
   // _do_not_unlock_if_synchronized to true. The remove_activation will
   // check this flag.
   const Address do_not_unlock_if_synchronized(rax,
         in_bytes(JavaThread::do_not_unlock_if_synchronized_offset()));
   __ movbool(do_not_unlock_if_synchronized, true);
   // make sure method is native & not abstract
 #ifdef ASSERT
   __ movl(rax, access_flags);
   {
     Label L;
     __ testl(rax, JVM_ACC_NATIVE);
     __ jcc(Assembler::notZero, L);
     __ stop("tried to execute non-native method as native");
     __ bind(L);
   }
   { Label L;
     __ testl(rax, JVM_ACC_ABSTRACT);
     __ jcc(Assembler::zero, L);
     __ stop("tried to execute abstract method in interpreter");
     __ bind(L);
   }
 #endif
   // increment invocation count & check for overflow
   Label invocation_counter_overflow;
   if (inc_counter) {
     generate_counter_incr(&invocation_counter_overflow, NULL, NULL);
   }
   Label continue_after_compile;
   __ bind(continue_after_compile);
   bang_stack_shadow_pages(true);
   // reset the _do_not_unlock_if_synchronized flag
   __ movl(rax, STATE(_thread));                       // get thread
   __ movbool(do_not_unlock_if_synchronized, false);
   // check for synchronized native methods
   //
   // Note: This must happen *after* invocation counter check, since
   //       when overflow happens, the method should not be locked.
   if (synchronized) {
     // potentially kills rax, rcx, rdx, rdi
     lock_method();
   } else {
     // no synchronization necessary
 #ifdef ASSERT
       { Label L;
         __ movl(rax, access_flags);
         __ testl(rax, JVM_ACC_SYNCHRONIZED);
         __ jcc(Assembler::zero, L);
         __ stop("method needs synchronization");
         __ bind(L);
       }
 #endif
   }
   // start execution
   // jvmti support
   __ notify_method_entry();
   // work registers
   const Register method = rbx;
   const Register thread = rdi;
   const Register t      = rcx;
   // allocate space for parameters
   __ movl(method, STATE(_method));
   __ verify_oop(method);
   __ load_unsigned_word(t, Address(method, methodOopDesc::size_of_parameters_offset()));
   __ shll(t, 2);
   __ addl(t, 2*wordSize);     // allocate two more slots for JNIEnv and possible mirror
   __ subl(rsp, t);
   __ andl(rsp, -(StackAlignmentInBytes)); // gcc needs 16 byte aligned stacks to do XMM intrinsics
   // get signature handler
     Label pending_exception_present;
   { Label L;
     __ movl(t, Address(method, methodOopDesc::signature_handler_offset()));
     __ testl(t, t);
     __ jcc(Assembler::notZero, L);
     __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::prepare_native_call), method, false);
     __ movl(method, STATE(_method));
     __ cmpl(Address(thread, Thread::pending_exception_offset()), NULL_WORD);
     __ jcc(Assembler::notEqual, pending_exception_present);
     __ verify_oop(method);
     __ movl(t, Address(method, methodOopDesc::signature_handler_offset()));
     __ bind(L);
   }
 #ifdef ASSERT
   {
     Label L;
     __ pushl(t);
     __ get_thread(t);                                   // get vm's javathread*
     __ cmpl(t, STATE(_thread));
     __ jcc(Assembler::equal, L);
     __ int3();
     __ bind(L);
     __ popl(t);
   }
 #endif //
   // call signature handler
   assert(InterpreterRuntime::SignatureHandlerGenerator::from() == rdi, "adjust this code");
   assert(InterpreterRuntime::SignatureHandlerGenerator::to  () == rsp, "adjust this code");
   assert(InterpreterRuntime::SignatureHandlerGenerator::temp() == t  , "adjust this code");
   // The generated handlers do not touch RBX (the method oop).
   // However, large signatures cannot be cached and are generated
   // each time here.  The slow-path generator will blow RBX
   // sometime, so we must reload it after the call.
   __ movl(rdi, STATE(_locals));  // get the from pointer
   __ call(t);
   __ movl(method, STATE(_method));
   __ verify_oop(method);
   // result handler is in rax
   // set result handler
   __ movl(STATE(_result_handler), rax);
   // pass mirror handle if static call
   { Label L;
     const int mirror_offset = klassOopDesc::klass_part_offset_in_bytes() + Klass::java_mirror_offset_in_bytes();
     __ movl(t, Address(method, methodOopDesc::access_flags_offset()));
     __ testl(t, JVM_ACC_STATIC);
     __ jcc(Assembler::zero, L);
     // get mirror
     __ movl(t, Address(method, methodOopDesc:: constants_offset()));
     __ movl(t, Address(t, constantPoolOopDesc::pool_holder_offset_in_bytes()));
     __ movl(t, Address(t, mirror_offset));
     // copy mirror into activation object
     __ movl(STATE(_oop_temp), t);
     // pass handle to mirror
     __ leal(t, STATE(_oop_temp));
     __ movl(Address(rsp, wordSize), t);
     __ bind(L);
   }
 #ifdef ASSERT
   {
     Label L;
     __ pushl(t);
     __ get_thread(t);                                   // get vm's javathread*
     __ cmpl(t, STATE(_thread));
     __ jcc(Assembler::equal, L);
     __ int3();
     __ bind(L);
     __ popl(t);
   }
 #endif //
   // get native function entry point
   { Label L;
     __ movl(rax, Address(method, methodOopDesc::native_function_offset()));
     __ testl(rax, rax);
     __ jcc(Assembler::notZero, L);
     __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::prepare_native_call), method);
     __ movl(method, STATE(_method));
     __ verify_oop(method);
     __ movl(rax, Address(method, methodOopDesc::native_function_offset()));
     __ bind(L);
   }
   // pass JNIEnv
   __ movl(thread, STATE(_thread));                       // get thread
   __ leal(t, Address(thread, JavaThread::jni_environment_offset()));
   __ movl(Address(rsp, 0), t);
 #ifdef ASSERT
   {
     Label L;
     __ pushl(t);
     __ get_thread(t);                                   // get vm's javathread*
     __ cmpl(t, STATE(_thread));
     __ jcc(Assembler::equal, L);
     __ int3();
     __ bind(L);
     __ popl(t);
   }
 #endif //
 #ifdef ASSERT
   { Label L;
     __ movl(t, Address(thread, JavaThread::thread_state_offset()));
     __ cmpl(t, _thread_in_Java);
     __ jcc(Assembler::equal, L);
     __ stop("Wrong thread state in native stub");
     __ bind(L);
   }
 #endif
   // Change state to native (we save the return address in the thread, since it might not
   // be pushed on the stack when we do a a stack traversal). It is enough that the pc()
   // points into the right code segment. It does not have to be the correct return pc.
   __ set_last_Java_frame(thread, noreg, rbp, __ pc());
   __ movl(Address(thread, JavaThread::thread_state_offset()), _thread_in_native);
   __ call(rax);
   // result potentially in rdx:rax or ST0
   __ movl(method, STATE(_method));
   __ movl(thread, STATE(_thread));                       // get thread
   // The potential result is in ST(0) & rdx:rax
   // With C++ interpreter we leave any possible result in ST(0) until we are in result handler and then
   // we do the appropriate stuff for returning the result. rdx:rax must always be saved because just about
   // anything we do here will destroy it, st(0) is only saved if we re-enter the vm where it would
   // be destroyed.
   // It is safe to do these pushes because state is _thread_in_native and return address will be found
   // via _last_native_pc and not via _last_jave_sp
     // Must save the value of ST(0) since it could be destroyed before we get to result handler
     { Label Lpush, Lskip;
       ExternalAddress float_handler(AbstractInterpreter::result_handler(T_FLOAT));
       ExternalAddress double_handler(AbstractInterpreter::result_handler(T_DOUBLE));
       __ cmpptr(STATE(_result_handler), float_handler.addr());
       __ jcc(Assembler::equal, Lpush);
       __ cmpptr(STATE(_result_handler), double_handler.addr());
       __ jcc(Assembler::notEqual, Lskip);
       __ bind(Lpush);
       __ push(dtos);
       __ bind(Lskip);
     }
   __ push(ltos);           // save rax:rdx for potential use by result handler.
   // Either restore the MXCSR register after returning from the JNI Call
   // or verify that it wasn't changed.
   if (VM_Version::supports_sse()) {
     if (RestoreMXCSROnJNICalls) {
       __ ldmxcsr(ExternalAddress(StubRoutines::addr_mxcsr_std()));
     }
     else if (CheckJNICalls ) {
       __ call(RuntimeAddress(StubRoutines::i486::verify_mxcsr_entry()));
     }
   }
   // Either restore the x87 floating pointer control word after returning
   // from the JNI call or verify that it wasn't changed.
   if (CheckJNICalls) {
     __ call(RuntimeAddress(StubRoutines::i486::verify_fpu_cntrl_wrd_entry()));
   }
   // change thread state
   __ movl(Address(thread, JavaThread::thread_state_offset()), _thread_in_native_trans);
   if(os::is_MP()) {
     // Write serialization page so VM thread can do a pseudo remote membar.
     // We use the current thread pointer to calculate a thread specific
     // offset to write to within the page. This minimizes bus traffic
     // due to cache line collision.
     __ serialize_memory(thread, rcx);
   }
   // check for safepoint operation in progress and/or pending suspend requests
   { Label Continue;
     __ cmp32(ExternalAddress(SafepointSynchronize::address_of_state()),
              SafepointSynchronize::_not_synchronized);
     // threads running native code and they are expected to self-suspend
     // when leaving the _thread_in_native state. We need to check for
     // pending suspend requests here.
     Label L;
     __ jcc(Assembler::notEqual, L);
     __ cmpl(Address(thread, JavaThread::suspend_flags_offset()), 0);
     __ jcc(Assembler::equal, Continue);
     __ bind(L);
     // Don't use call_VM as it will see a possible pending exception and forward it
     // and never return here preventing us from clearing _last_native_pc down below.
     // Also can't use call_VM_leaf either as it will check to see if rsi & rdi are
     // preserved and correspond to the bcp/locals pointers. So we do a runtime call
     // by hand.
     //
     __ pushl(thread);
     __ call(RuntimeAddress(CAST_FROM_FN_PTR(address,
                                             JavaThread::check_special_condition_for_native_trans)));
     __ increment(rsp, wordSize);
     __ movl(method, STATE(_method));
     __ verify_oop(method);
     __ movl(thread, STATE(_thread));                       // get thread
     __ bind(Continue);
   }
   // change thread state
   __ movl(Address(thread, JavaThread::thread_state_offset()), _thread_in_Java);
   __ reset_last_Java_frame(thread, true, true);
   // reset handle block
   __ movl(t, Address(thread, JavaThread::active_handles_offset()));
   __ movl(Address(t, JNIHandleBlock::top_offset_in_bytes()), NULL_WORD);
   // If result was an oop then unbox and save it in the frame
   { Label L;
     Label no_oop, store_result;
       ExternalAddress oop_handler(AbstractInterpreter::result_handler(T_OBJECT));
     __ cmpptr(STATE(_result_handler), oop_handler.addr());
     __ jcc(Assembler::notEqual, no_oop);
     __ pop(ltos);
     __ testl(rax, rax);
     __ jcc(Assembler::zero, store_result);
     // unbox
     __ movl(rax, Address(rax, 0));
     __ bind(store_result);
     __ movl(STATE(_oop_temp), rax);
     // keep stack depth as expected by pushing oop which will eventually be discarded
     __ push(ltos);
     __ bind(no_oop);
   }
   {
      Label no_reguard;
      __ cmpl(Address(thread, JavaThread::stack_guard_state_offset()), JavaThread::stack_guard_yellow_disabled);
      __ jcc(Assembler::notEqual, no_reguard);
      __ pushad();
      __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, SharedRuntime::reguard_yellow_pages)));
      __ popad();
      __ bind(no_reguard);
    }
   // QQQ Seems like for native methods we simply return and the caller will see the pending
   // exception and do the right thing. Certainly the interpreter will, don't know about
   // compiled methods.
   // Seems that the answer to above is no this is wrong. The old code would see the exception
   // and forward it before doing the unlocking and notifying jvmdi that method has exited.
   // This seems wrong need to investigate the spec.
   // handle exceptions (exception handling will handle unlocking!)
   { Label L;
     __ cmpl(Address(thread, Thread::pending_exception_offset()), NULL_WORD);
     __ jcc(Assembler::zero, L);
     __ bind(pending_exception_present);
     // There are potential results on the stack (rax/rdx, ST(0)) we ignore these and simply
     // return and let caller deal with exception. This skips the unlocking here which
     // seems wrong but seems to be what asm interpreter did. Can't find this in the spec.
     // Note: must preverve method in rbx
     //
     // remove activation
     __ movl(t, STATE(_sender_sp));
     __ leave();                                  // remove frame anchor
     __ popl(rdi);                                // get return address
     __ movl(state, STATE(_prev_link));           // get previous state for return
     __ movl(rsp, t);                             // set sp to sender sp
     __ pushl(rdi);                               // [ush throwing pc
     // The skips unlocking!! This seems to be what asm interpreter does but seems
     // very wrong. Not clear if this violates the spec.
     __ jump(RuntimeAddress(StubRoutines::forward_exception_entry()));
     __ bind(L);
   }
   // do unlocking if necessary
   { Label L;
     __ movl(t, Address(method, methodOopDesc::access_flags_offset()));
     __ testl(t, JVM_ACC_SYNCHRONIZED);
     __ jcc(Assembler::zero, L);
     // the code below should be shared with interpreter macro assembler implementation
     { Label unlock;
       // 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.
       __ movl(rdx, STATE(_monitor_base));
       __ subl(rdx, frame::interpreter_frame_monitor_size() * wordSize);  // address of initial monitor
       __ movl(t, Address(rdx, BasicObjectLock::obj_offset_in_bytes()));
       __ testl(t, t);
       __ jcc(Assembler::notZero, unlock);
       // Entry already unlocked, need to throw exception
       __ MacroAssembler::call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_illegal_monitor_state_exception));
       __ should_not_reach_here();
       __ bind(unlock);
       __ unlock_object(rdx);
       // unlock can blow rbx so restore it for path that needs it below
       __ movl(method, STATE(_method));
     }
     __ bind(L);
   }
   // jvmti support
   // Note: This must happen _after_ handling/throwing any exceptions since
   //       the exception handler code notifies the runtime of method exits
   //       too. If this happens before, method entry/exit notifications are
   //       not properly paired (was bug - gri 11/22/99).
   __ notify_method_exit(vtos, InterpreterMacroAssembler::NotifyJVMTI);
   // restore potential result in rdx:rax, call result handler to restore potential result in ST0 & handle result
   __ pop(ltos);                               // restore rax/rdx floating result if present still on stack
   __ movl(t, STATE(_result_handler));         // get result handler
   __ call(t);                                 // call result handler to convert to tosca form
   // remove activation
   __ movl(t, STATE(_sender_sp));
   __ leave();                                  // remove frame anchor
   __ popl(rdi);                                // get return address
   __ movl(state, STATE(_prev_link));           // get previous state for return (if c++ interpreter was caller)
   __ movl(rsp, t);                             // set sp to sender sp
   __ jmp(rdi);
   // invocation counter overflow
   if (inc_counter) {
     // Handle overflow of counter and compile method
     __ bind(invocation_counter_overflow);
     generate_counter_overflow(&continue_after_compile);
   }
   return entry_point;
 }
 // Generate entries that will put a result type index into rcx
 void CppInterpreterGenerator::generate_deopt_handling() {
   const Register state = rsi;
   Label return_from_deopt_common;
   // Generate entries that will put a result type index into rcx
   // deopt needs to jump to here to enter the interpreter (return a result)
   deopt_frame_manager_return_atos  = __ pc();
   // rax is live here
   __ movl(rcx, AbstractInterpreter::BasicType_as_index(T_OBJECT));    // Result stub address array index
   __ jmp(return_from_deopt_common);
   // deopt needs to jump to here to enter the interpreter (return a result)
   deopt_frame_manager_return_btos  = __ pc();
   // rax is live here
   __ movl(rcx, AbstractInterpreter::BasicType_as_index(T_BOOLEAN));    // Result stub address array index
   __ jmp(return_from_deopt_common);
   // deopt needs to jump to here to enter the interpreter (return a result)
   deopt_frame_manager_return_itos  = __ pc();
   // rax is live here
   __ movl(rcx, AbstractInterpreter::BasicType_as_index(T_INT));    // Result stub address array index
   __ jmp(return_from_deopt_common);
   // deopt needs to jump to here to enter the interpreter (return a result)
   deopt_frame_manager_return_ltos  = __ pc();
   // rax,rdx are live here
   __ movl(rcx, AbstractInterpreter::BasicType_as_index(T_LONG));    // Result stub address array index
   __ jmp(return_from_deopt_common);
   // deopt needs to jump to here to enter the interpreter (return a result)
   deopt_frame_manager_return_ftos  = __ pc();
   // st(0) is live here
   __ movl(rcx, AbstractInterpreter::BasicType_as_index(T_FLOAT));    // Result stub address array index
   __ jmp(return_from_deopt_common);
   // deopt needs to jump to here to enter the interpreter (return a result)
   deopt_frame_manager_return_dtos  = __ pc();
   // st(0) is live here
   __ movl(rcx, AbstractInterpreter::BasicType_as_index(T_DOUBLE));    // Result stub address array index
   __ jmp(return_from_deopt_common);
   // deopt needs to jump to here to enter the interpreter (return a result)
   deopt_frame_manager_return_vtos  = __ pc();
   __ movl(rcx, AbstractInterpreter::BasicType_as_index(T_VOID));
   // Deopt return common
   // an index is present in rcx that lets us move any possible result being
   // return to the interpreter's stack
   //
   // Because we have a full sized interpreter frame on the youngest
   // activation the stack is pushed too deep to share the tosca to
   // stack converters directly. We shrink the stack to the desired
   // amount and then push result and then re-extend the stack.
   // We could have the code in size_activation layout a short
   // frame for the top activation but that would look different
   // than say sparc (which needs a full size activation because
   // the windows are in the way. Really it could be short? QQQ
   //
   __ bind(return_from_deopt_common);
   __ leal(state, Address(rbp, -(int)sizeof(BytecodeInterpreter)));
   // setup rsp so we can push the "result" as needed.
   __ movl(rsp, STATE(_stack));                                     // trim stack (is prepushed)
   __ addl(rsp, wordSize);                                          // undo prepush
   ExternalAddress tosca_to_stack((address)CppInterpreter::_tosca_to_stack);
   // Address index(noreg, rcx, Address::times_4);
   __ movptr(rcx, ArrayAddress(tosca_to_stack, Address(noreg, rcx, Address::times_4)));
   // __ movl(rcx, Address(noreg, rcx, Address::times_4, int(AbstractInterpreter::_tosca_to_stack)));
   __ call(rcx);                                                   // call result converter
   __ movl(STATE(_msg), (int)BytecodeInterpreter::deopt_resume);
   __ leal(rsp, Address(rsp, -wordSize));                           // prepush stack (result if any already present)
   __ movl(STATE(_stack), rsp);                                     // inform interpreter of new stack depth (parameters removed,
                                                                    // result if any on stack already )
   __ movl(rsp, STATE(_stack_limit));                               // restore expression stack to full depth
 }
 // Generate the code to handle a more_monitors message from the c++ interpreter
 void CppInterpreterGenerator::generate_more_monitors() {
   const Register state = rsi;
   Label entry, loop;
   const int entry_size = frame::interpreter_frame_monitor_size() * wordSize;
   // 1. compute new pointers                   // rsp: old expression stack top
   __ movl(rdx, STATE(_stack_base));            // rdx: old expression stack bottom
   __ subl(rsp, entry_size);                    // move expression stack top limit
   __ subl(STATE(_stack), entry_size);          // update interpreter stack top
   __ movl(STATE(_stack_limit), rsp);           // inform interpreter
   __ subl(rdx, entry_size);                    // move expression stack bottom
   __ movl(STATE(_stack_base), rdx);            // inform interpreter
   __ movl(rcx, STATE(_stack));                 // set start value for copy loop
   __ 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
   // now zero the slot so we can find it.
   __ movl(Address(rdx, BasicObjectLock::obj_offset_in_bytes()), (int) NULL);
   __ movl(STATE(_msg), (int)BytecodeInterpreter::got_monitors);
 }
 // Initial entry to C++ interpreter from the call_stub.
 // This entry point is called the frame manager since it handles the generation
 // of interpreter activation frames via requests directly from the vm (via call_stub)
 // and via requests from the interpreter. The requests from the call_stub happen
 // directly thru the entry point. Requests from the interpreter happen via returning
 // from the interpreter and examining the message the interpreter has returned to
 // the frame manager. The frame manager can take the following requests:
 // NO_REQUEST - error, should never happen.
 // MORE_MONITORS - need a new monitor. Shuffle the expression stack on down and
 //                 allocate a new monitor.
 // CALL_METHOD - setup a new activation to call a new method. Very similar to what
 //               happens during entry during the entry via the call stub.
 // RETURN_FROM_METHOD - remove an activation. Return to interpreter or call stub.
 //
 // Arguments:
 //
 // rbx: methodOop
 // rcx: receiver - unused (retrieved from stack as needed)
 // rsi: previous frame manager state (NULL from the call_stub/c1/c2)
 //
 //
 // Stack layout at entry
 //
 // [ return address     ] <--- rsp
 // [ parameter n        ]
 //   ...
 // [ parameter 1        ]
 // [ expression stack   ]
 //
 //
 // We are free to blow any registers we like because the call_stub which brought us here
 // initially has preserved the callee save registers already.
 //
 //
 static address interpreter_frame_manager = NULL;
 address InterpreterGenerator::generate_normal_entry(bool synchronized) {
   // rbx: methodOop
   // rsi: sender sp
   // Because we redispatch "recursive" interpreter entries thru this same entry point
   // the "input" register usage is a little strange and not what you expect coming
   // from the call_stub. From the call stub rsi/rdi (current/previous) interpreter
   // state are NULL but on "recursive" dispatches they are what you'd expect.
   // rsi: current interpreter state (C++ interpreter) must preserve (null from call_stub/c1/c2)
   // A single frame manager is plenty as we don't specialize for synchronized. We could and
   // the code is pretty much ready. Would need to change the test below and for good measure
   // modify generate_interpreter_state to only do the (pre) sync stuff stuff for synchronized
   // routines. Not clear this is worth it yet.
   if (interpreter_frame_manager) return interpreter_frame_manager;
   address entry_point = __ pc();
   // Fast accessor methods share this entry point.
   // This works because frame manager is in the same codelet
   if (UseFastAccessorMethods && !synchronized) __ bind(fast_accessor_slow_entry_path);
   Label dispatch_entry_2;
   __ movl(rcx, rsi);
   __ movl(rsi, 0);                                                 // no current activation
   __ jmp(dispatch_entry_2);
   const Register state   = rsi;                                    // current activation object, valid on entry
   const Register locals  = rdi;
   Label re_dispatch;
   __ bind(re_dispatch);
   // save sender sp (doesn't include return address
   __ leal(rcx, Address(rsp, wordSize));
   __ bind(dispatch_entry_2);
   // save sender sp
   __ pushl(rcx);
   const Address size_of_parameters(rbx, methodOopDesc::size_of_parameters_offset());
   const Address size_of_locals    (rbx, methodOopDesc::size_of_locals_offset());
   const Address access_flags      (rbx, methodOopDesc::access_flags_offset());
   // 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 Address monitor(rbp, frame::interpreter_frame_initial_sp_offset * wordSize - (int)sizeof(BasicObjectLock));
   // get parameter size (always needed)
   __ load_unsigned_word(rcx, size_of_parameters);
   // rbx: methodOop
   // rcx: size of parameters
   __ load_unsigned_word(rdx, size_of_locals);                      // get size of locals in words
   __ subl(rdx, rcx);                                               // rdx = no. of additional locals
   // see if we've got enough room on the stack for locals plus overhead.
   generate_stack_overflow_check();                                 // C++
   // c++ interpreter does not use stack banging or any implicit exceptions
   // leave for now to verify that check is proper.
   bang_stack_shadow_pages(false);
   // compute beginning of parameters (rdi)
   __ leal(locals, Address(rsp, rcx, Address::times_4, wordSize));
   // save sender's sp
   // __ movl(rcx, rsp);
   // get sender's sp
   __ popl(rcx);
   // get return address
   __ popl(rax);
   // rdx - # of additional locals
   // allocate space for locals
   // explicitly initialize locals
   {
     Label exit, loop;
     __ testl(rdx, rdx);
     __ jcc(Assembler::lessEqual, exit);               // do nothing if rdx <= 0
     __ bind(loop);
     __ pushl((int)NULL);                              // initialize local variables
     __ decrement(rdx);                                // until everything initialized
     __ jcc(Assembler::greater, loop);
     __ bind(exit);
   }
   // Assumes rax = return address
   // allocate and initialize new interpreterState and method expression stack
   // IN(locals) ->  locals
   // IN(state) -> any current interpreter activation
   // destroys rax, rcx, rdx, rdi
   // OUT (state) -> new interpreterState
   // OUT(rsp) -> bottom of methods expression stack
   generate_compute_interpreter_state(state, locals, rcx, false);
   // Call interpreter
   Label call_interpreter;
   __ bind(call_interpreter);
   // c++ interpreter does not use stack banging or any implicit exceptions
   // leave for now to verify that check is proper.
   bang_stack_shadow_pages(false);
   // Call interpreter enter here if message is
   // set and we know stack size is valid
   Label call_interpreter_2;
   __ bind(call_interpreter_2);
   {
     const Register thread  = rcx;
     __ pushl(state);                                                 // push arg to interpreter
     __ movl(thread, STATE(_thread));
     // We can setup the frame anchor with everything we want at this point
     // as we are thread_in_Java and no safepoints can occur until we go to
     // vm mode. We do have to clear flags on return from vm but that is it
     //
     __ movl(Address(thread, JavaThread::last_Java_fp_offset()), rbp);
     __ movl(Address(thread, JavaThread::last_Java_sp_offset()), rsp);
     // Call the interpreter
     RuntimeAddress normal(CAST_FROM_FN_PTR(address, BytecodeInterpreter::run));
     RuntimeAddress checking(CAST_FROM_FN_PTR(address, BytecodeInterpreter::runWithChecks));
     __ call(JvmtiExport::can_post_interpreter_events() ? checking : normal);
     __ popl(rax);                                                  // discard parameter to run
     //
     // state is preserved since it is callee saved
     //
     // reset_last_Java_frame
     __ movl(thread, STATE(_thread));
     __ reset_last_Java_frame(thread, true, true);
   }
   // examine msg from interpreter to determine next action
   __ movl(rdx, STATE(_msg));                                       // Get new message
   Label call_method;
   Label return_from_interpreted_method;
   Label throw_exception;
   Label bad_msg;
   Label do_OSR;
   __ cmpl(rdx, (int)BytecodeInterpreter::call_method);
   __ jcc(Assembler::equal, call_method);
   __ cmpl(rdx, (int)BytecodeInterpreter::return_from_method);
   __ jcc(Assembler::equal, return_from_interpreted_method);
   __ cmpl(rdx, (int)BytecodeInterpreter::do_osr);
   __ jcc(Assembler::equal, do_OSR);
   __ cmpl(rdx, (int)BytecodeInterpreter::throwing_exception);
   __ jcc(Assembler::equal, throw_exception);
   __ cmpl(rdx, (int)BytecodeInterpreter::more_monitors);
   __ jcc(Assembler::notEqual, bad_msg);
   // Allocate more monitor space, shuffle expression stack....
   generate_more_monitors();
   __ jmp(call_interpreter);
   // uncommon trap needs to jump to here to enter the interpreter (re-execute current bytecode)
   unctrap_frame_manager_entry  = __ pc();
   //
   // Load the registers we need.
   __ leal(state, Address(rbp, -(int)sizeof(BytecodeInterpreter)));
   __ movl(rsp, STATE(_stack_limit));                               // restore expression stack to full depth
   __ jmp(call_interpreter_2);
   //=============================================================================
   // Returning from a compiled method into a deopted method. The bytecode at the
   // bcp has completed. The result of the bytecode is in the native abi (the tosca
   // for the template based interpreter). Any stack space that was used by the
   // bytecode that has completed has been removed (e.g. parameters for an invoke)
   // so all that we have to do is place any pending result on the expression stack
   // and resume execution on the next bytecode.
   generate_deopt_handling();
   __ jmp(call_interpreter);
   // Current frame has caught an exception we need to dispatch to the
   // handler. We can get here because a native interpreter frame caught
   // an exception in which case there is no handler and we must rethrow
   // If it is a vanilla interpreted frame the we simply drop into the
   // interpreter and let it do the lookup.
   Interpreter::_rethrow_exception_entry = __ pc();
   // rax: exception
   // rdx: return address/pc that threw exception
   Label return_with_exception;
   Label unwind_and_forward;
   // restore state pointer.
   __ leal(state, Address(rbp,  -sizeof(BytecodeInterpreter)));
   __ movl(rbx, STATE(_method));                       // get method
   __ movl(rcx, STATE(_thread));                       // get thread
   // Store exception with interpreter will expect it
   __ movl(Address(rcx, Thread::pending_exception_offset()), rax);
   // is current frame vanilla or native?
   __ movl(rdx, access_flags);
   __ testl(rdx, JVM_ACC_NATIVE);
   __ jcc(Assembler::zero, return_with_exception);     // vanilla interpreted frame, handle directly
   // We drop thru to unwind a native interpreted frame with a pending exception
   // We jump here for the initial interpreter frame with exception pending
   // We unwind the current acivation and forward it to our caller.
   __ bind(unwind_and_forward);
   // unwind rbp, return stack to unextended value and re-push return address
   __ movl(rcx, STATE(_sender_sp));
   __ leave();
   __ popl(rdx);
   __ movl(rsp, rcx);
   __ pushl(rdx);
   __ jump(RuntimeAddress(StubRoutines::forward_exception_entry()));
   // Return point from a call which returns a result in the native abi
   // (c1/c2/jni-native). This result must be processed onto the java
   // expression stack.
   //
   // A pending exception may be present in which case there is no result present
   Label resume_interpreter;
   Label do_float;
   Label do_double;
   Label done_conv;
   address compiled_entry = __ pc();
   // The FPU stack is clean if UseSSE >= 2 but must be cleaned in other cases
   if (UseSSE < 2) {
     __ leal(state, Address(rbp,  -sizeof(BytecodeInterpreter)));
     __ movl(rbx, STATE(_result._to_call._callee));                     // get method just executed
     __ movl(rcx, Address(rbx, methodOopDesc::result_index_offset()));
     __ cmpl(rcx, AbstractInterpreter::BasicType_as_index(T_FLOAT));    // Result stub address array index
     __ jcc(Assembler::equal, do_float);
     __ cmpl(rcx, AbstractInterpreter::BasicType_as_index(T_DOUBLE));    // Result stub address array index
     __ jcc(Assembler::equal, do_double);
 #ifdef COMPILER2
     __ empty_FPU_stack();
 #endif // COMPILER2
     __ jmp(done_conv);
     __ bind(do_float);
 #ifdef COMPILER2
     for (int i = 1; i < 8; i++) {
       __ ffree(i);
     }
 #endif // COMPILER2
     __ jmp(done_conv);
     __ bind(do_double);
 #ifdef COMPILER2
     for (int i = 1; i < 8; i++) {
       __ ffree(i);
     }
 #endif // COMPILER2
     __ jmp(done_conv);
   } else {
     __ MacroAssembler::verify_FPU(0, "generate_return_entry_for compiled");
     __ jmp(done_conv);
   }
   // emit a sentinel we can test for when converting an interpreter
   // entry point to a compiled entry point.
   __ a_long(Interpreter::return_sentinel);
   __ a_long((int)compiled_entry);
   // Return point to interpreter from compiled/native method
   InternalAddress return_from_native_method(__ pc());
   __ bind(done_conv);
   // Result if any is in tosca. The java expression stack is in the state that the
   // calling convention left it (i.e. params may or may not be present)
   // Copy the result from tosca and place it on java expression stack.
   // Restore rsi as compiled code may not preserve it
   __ leal(state, Address(rbp,  -sizeof(BytecodeInterpreter)));
   // restore stack to what we had when we left (in case i2c extended it)
   __ movl(rsp, STATE(_stack));
   __ leal(rsp, Address(rsp, wordSize));
   // If there is a pending exception then we don't really have a result to process
   __ movl(rcx, STATE(_thread));                       // get thread
   __ cmpl(Address(rcx, Thread::pending_exception_offset()), (int)NULL);
   __ jcc(Assembler::notZero, return_with_exception);
   // get method just executed
   __ movl(rbx, STATE(_result._to_call._callee));
   // callee left args on top of expression stack, remove them
   __ load_unsigned_word(rcx, Address(rbx, methodOopDesc::size_of_parameters_offset()));
   __ leal(rsp, Address(rsp, rcx, Address::times_4));
   __ movl(rcx, Address(rbx, methodOopDesc::result_index_offset()));
   ExternalAddress tosca_to_stack((address)CppInterpreter::_tosca_to_stack);
   // Address index(noreg, rax, Address::times_4);
   __ movptr(rcx, ArrayAddress(tosca_to_stack, Address(noreg, rcx, Address::times_4)));
   // __ movl(rcx, Address(noreg, rcx, Address::times_4, int(AbstractInterpreter::_tosca_to_stack)));
   __ call(rcx);                                               // call result converter
   __ jmp(resume_interpreter);
   // An exception is being caught on return to a vanilla interpreter frame.
   // Empty the stack and resume interpreter
   __ bind(return_with_exception);
   // Exception present, empty stack
   __ movl(rsp, STATE(_stack_base));
   __ jmp(resume_interpreter);
   // Return from interpreted method we return result appropriate to the caller (i.e. "recursive"
   // interpreter call, or native) and unwind this interpreter activation.
   // All monitors should be unlocked.
   __ bind(return_from_interpreted_method);
   Label return_to_initial_caller;
   __ movl(rbx, STATE(_method));                                     // get method just executed
   __ cmpl(STATE(_prev_link), (int)NULL);                            // returning from "recursive" interpreter call?
   __ movl(rax, Address(rbx, methodOopDesc::result_index_offset())); // get result type index
   __ jcc(Assembler::equal, return_to_initial_caller);               // back to native code (call_stub/c1/c2)
   // Copy result to callers java stack
   ExternalAddress stack_to_stack((address)CppInterpreter::_stack_to_stack);
   // Address index(noreg, rax, Address::times_4);
   __ movptr(rax, ArrayAddress(stack_to_stack, Address(noreg, rax, Address::times_4)));
   // __ movl(rax, Address(noreg, rax, Address::times_4, int(AbstractInterpreter::_stack_to_stack)));
   __ call(rax);                                                     // call result converter
   Label unwind_recursive_activation;
   __ bind(unwind_recursive_activation);
   // returning to interpreter method from "recursive" interpreter call
   // result converter left rax pointing to top of the java stack for method we are returning
   // to. Now all we must do is unwind the state from the completed call
   __ movl(state, STATE(_prev_link));                                // unwind state
   __ leave();                                                       // pop the frame
   __ movl(rsp, rax);                                                // unwind stack to remove args
   // Resume the interpreter. The current frame contains the current interpreter
   // state object.
   //
   __ bind(resume_interpreter);
   // state == interpreterState object for method we are resuming
   __ movl(STATE(_msg), (int)BytecodeInterpreter::method_resume);
   __ leal(rsp, Address(rsp, -wordSize));                           // prepush stack (result if any already present)
   __ movl(STATE(_stack), rsp);                                     // inform interpreter of new stack depth (parameters removed,
                                                                    // result if any on stack already )
   __ movl(rsp, STATE(_stack_limit));                               // restore expression stack to full depth
   __ jmp(call_interpreter_2);                                      // No need to bang
   // interpreter returning to native code (call_stub/c1/c2)
   // convert result and unwind initial activation
   // rax - result index
   __ bind(return_to_initial_caller);
   ExternalAddress stack_to_native((address)CppInterpreter::_stack_to_native_abi);
   // Address index(noreg, rax, Address::times_4);
   __ movptr(rax, ArrayAddress(stack_to_native, Address(noreg, rax, Address::times_4)));
   __ call(rax);                                                    // call result converter
   Label unwind_initial_activation;
   __ bind(unwind_initial_activation);
   // RETURN TO CALL_STUB/C1/C2 code (result if any in rax/rdx ST(0))
   /* Current stack picture
         [ incoming parameters ]
         [ extra locals ]
         [ return address to CALL_STUB/C1/C2]
   fp -> [ CALL_STUB/C1/C2 fp ]
         BytecodeInterpreter object
         expression stack
   sp ->
   */
   // return restoring the stack to the original sender_sp value
   __ movl(rcx, STATE(_sender_sp));
   __ leave();
   __ popl(rdi);                                                     // get return address
   // set stack to sender's sp
   __ movl(rsp, rcx);
   __ jmp(rdi);                                                        // return to call_stub
   // OSR request, adjust return address to make current frame into adapter frame
   // and enter OSR nmethod
   __ bind(do_OSR);
   Label remove_initial_frame;
   // We are going to pop this frame. Is there another interpreter frame underneath
   // it or is it callstub/compiled?
   // Move buffer to the expected parameter location
   __ movl(rcx, STATE(_result._osr._osr_buf));
   __ movl(rax, STATE(_result._osr._osr_entry));
   __ cmpl(STATE(_prev_link), (int)NULL);                       // returning from "recursive" interpreter call?
   __ jcc(Assembler::equal, remove_initial_frame);              // back to native code (call_stub/c1/c2)
   // __ movl(state, STATE(_prev_link));                           // unwind state
   __ movl(rsi, STATE(_sender_sp));                             // get sender's sp in expected register
   __ leave();                                                  // pop the frame
   __ movl(rsp, rsi);                                           // trim any stack expansion
   // We know we are calling compiled so push specialized return
   // method uses specialized entry, push a return so we look like call stub setup
   // this path will handle fact that result is returned in registers and not
   // on the java stack.
   __ pushptr(return_from_native_method.addr());
   __ jmp(rax);
   __ bind(remove_initial_frame);
   __ movl(rdx, STATE(_sender_sp));
   __ leave();
   // get real return
   __ popl(rsi);
   // set stack to sender's sp
   __ movl(rsp, rdx);
   // repush real return
   __ pushl(rsi);
   // Enter OSR nmethod
   __ jmp(rax);
   // Call a new method. All we do is (temporarily) trim the expression stack
   // push a return address to bring us back to here and leap to the new entry.
   __ bind(call_method);
   // stack points to next free location and not top element on expression stack
   // method expects sp to be pointing to topmost element
   __ movl(rsp, STATE(_stack));                                       // pop args to c++ interpreter, set sp to java stack top
   __ leal(rsp, Address(rsp, wordSize));
   __ movl(rbx, STATE(_result._to_call._callee));                     // get method to execute
   // don't need a return address if reinvoking interpreter
   // Make it look like call_stub calling conventions
   // Get (potential) receiver
   __ load_unsigned_word(rcx, size_of_parameters);                     // get size of parameters in words
   ExternalAddress recursive(CAST_FROM_FN_PTR(address, RecursiveInterpreterActivation));
   __ pushptr(recursive.addr());                                      // make it look good in the debugger
   InternalAddress entry(entry_point);
   __ cmpptr(STATE(_result._to_call._callee_entry_point), entry.addr()); // returning to interpreter?
   __ jcc(Assembler::equal, re_dispatch);                             // yes
   __ popl(rax);                                                      // pop dummy address
   // get specialized entry
   __ movl(rax, STATE(_result._to_call._callee_entry_point));
   // set sender SP
   __ movl(rsi, rsp);
   // method uses specialized entry, push a return so we look like call stub setup
   // this path will handle fact that result is returned in registers and not
   // on the java stack.
   __ pushptr(return_from_native_method.addr());
   __ jmp(rax);
   __ bind(bad_msg);
   __ stop("Bad message from interpreter");
   // Interpreted method "returned" with an exception pass it on...
   // Pass result, unwind activation and continue/return to interpreter/call_stub
   // We handle result (if any) differently based on return to interpreter or call_stub
   Label unwind_initial_with_pending_exception;
   __ bind(throw_exception);
   __ cmpl(STATE(_prev_link), (int)NULL);                            // returning from recursive interpreter call?
   __ jcc(Assembler::equal, unwind_initial_with_pending_exception);  // no, back to native code (call_stub/c1/c2)
   __ movl(rax, STATE(_locals));                                     // pop parameters get new stack value
   __ addl(rax, wordSize);                                           // account for prepush before we return
   __ jmp(unwind_recursive_activation);
   __ bind(unwind_initial_with_pending_exception);
   // We will unwind the current (initial) interpreter frame and forward
   // the exception to the caller. We must put the exception in the
   // expected register and clear pending exception and then forward.
   __ jmp(unwind_and_forward);
   interpreter_frame_manager = entry_point;
   return entry_point;
 }
 address AbstractInterpreterGenerator::generate_method_entry(AbstractInterpreter::MethodKind kind) {
   // determine code generation flags
   bool synchronized = false;
   address entry_point = NULL;
   switch (kind) {
     case Interpreter::zerolocals             :                                                                             break;
     case Interpreter::zerolocals_synchronized: synchronized = true;                                                        break;
     case Interpreter::native                 : entry_point = ((InterpreterGenerator*)this)->generate_native_entry(false);  break;
     case Interpreter::native_synchronized    : entry_point = ((InterpreterGenerator*)this)->generate_native_entry(true);   break;
     case Interpreter::empty                  : entry_point = ((InterpreterGenerator*)this)->generate_empty_entry();        break;
     case Interpreter::accessor               : entry_point = ((InterpreterGenerator*)this)->generate_accessor_entry();     break;
     case Interpreter::abstract               : entry_point = ((InterpreterGenerator*)this)->generate_abstract_entry();     break;
     case Interpreter::java_lang_math_sin     : // fall thru
     case Interpreter::java_lang_math_cos     : // fall thru
     case Interpreter::java_lang_math_tan     : // fall thru
     case Interpreter::java_lang_math_abs     : // fall thru
     case Interpreter::java_lang_math_log     : // fall thru
     case Interpreter::java_lang_math_log10   : // fall thru
     case Interpreter::java_lang_math_sqrt    : entry_point = ((InterpreterGenerator*)this)->generate_math_entry(kind);     break;
     default                                  : ShouldNotReachHere();                                                       break;
   }
   if (entry_point) return entry_point;
   return ((InterpreterGenerator*)this)->generate_normal_entry(synchronized);
 }
 InterpreterGenerator::InterpreterGenerator(StubQueue* code)
  : CppInterpreterGenerator(code) {
    generate_all(); // down here so it can be "virtual"
 }
 // Deoptimization helpers for C++ interpreter
 // How much stack a method activation needs in words.
 int AbstractInterpreter::size_top_interpreter_activation(methodOop method) {
   const int stub_code = 4;  // see generate_call_stub
   // Save space for one monitor to get into the interpreted method in case
   // the method is synchronized
   int monitor_size    = method->is_synchronized() ?
 *frame::interpreter_frame_monitor_size() : 0;
   // total static overhead size. Account for interpreter state object, return
   // address, saved rbp and 2 words for a "static long no_params() method" issue.
   const int overhead_size = sizeof(BytecodeInterpreter)/wordSize +
     ( frame::sender_sp_offset - frame::link_offset) + 2;
   const int method_stack = (method->max_locals() + method->max_stack()) *
                            Interpreter::stackElementWords();
   return overhead_size + method_stack + stub_code;
 }
 // returns the activation size.
 static int size_activation_helper(int extra_locals_size, int monitor_size) {
   return (extra_locals_size +                  // the addition space for locals
 *BytesPerWord +                     // return address and saved rbp
 *BytesPerWord +                     // "static long no_params() method" issue
           sizeof(BytecodeInterpreter) +               // interpreterState
           monitor_size);                       // monitors
 }
 void BytecodeInterpreter::layout_interpreterState(interpreterState to_fill,
                                            frame* caller,
                                            frame* current,
                                            methodOop method,
                                            intptr_t* locals,
                                            intptr_t* stack,
                                            intptr_t* stack_base,
                                            intptr_t* monitor_base,
                                            intptr_t* frame_bottom,
                                            bool is_top_frame
                                            )
 {
   // What about any vtable?
   //
   to_fill->_thread = JavaThread::current();
   // This gets filled in later but make it something recognizable for now
   to_fill->_bcp = method->code_base();
   to_fill->_locals = locals;
   to_fill->_constants = method->constants()->cache();
   to_fill->_method = method;
   to_fill->_mdx = NULL;
   to_fill->_stack = stack;
   if (is_top_frame && JavaThread::current()->popframe_forcing_deopt_reexecution() ) {
     to_fill->_msg = deopt_resume2;
   } else {
     to_fill->_msg = method_resume;
   }
   to_fill->_result._to_call._bcp_advance = 0;
   to_fill->_result._to_call._callee_entry_point = NULL; // doesn't matter to anyone
   to_fill->_result._to_call._callee = NULL; // doesn't matter to anyone
   to_fill->_prev_link = NULL;
   to_fill->_sender_sp = caller->unextended_sp();
   if (caller->is_interpreted_frame()) {
     interpreterState prev  = caller->get_interpreterState();
     to_fill->_prev_link = prev;
     // *current->register_addr(GR_Iprev_state) = (intptr_t) prev;
     // Make the prev callee look proper
     prev->_result._to_call._callee = method;
     if (*prev->_bcp == Bytecodes::_invokeinterface) {
       prev->_result._to_call._bcp_advance = 5;
     } else {
       prev->_result._to_call._bcp_advance = 3;
     }
   }
   to_fill->_oop_temp = NULL;
   to_fill->_stack_base = stack_base;
   // Need +1 here because stack_base points to the word just above the first expr stack entry
   // and stack_limit is supposed to point to the word just below the last expr stack entry.
   // See generate_compute_interpreter_state.
   to_fill->_stack_limit = stack_base - (method->max_stack() + 1);
   to_fill->_monitor_base = (BasicObjectLock*) monitor_base;
   to_fill->_self_link = to_fill;
   assert(stack >= to_fill->_stack_limit && stack < to_fill->_stack_base,
          "Stack top out of range");
 }
 int AbstractInterpreter::layout_activation(methodOop method,
                                                 int tempcount,  //
                                                 int popframe_extra_args,
                                                 int moncount,
                                                 int callee_param_count,
                                                 int callee_locals,
                                                 frame* caller,
                                                 frame* interpreter_frame,
                                                 bool is_top_frame) {
   assert(popframe_extra_args == 0, "FIX ME");
   // NOTE this code must exactly mimic what InterpreterGenerator::generate_compute_interpreter_state()
   // does as far as allocating an interpreter frame.
   // If interpreter_frame!=NULL, set up the method, locals, and monitors.
   // The frame interpreter_frame, if not NULL, is guaranteed to be the right size,
   // as determined by a previous call to this method.
   // It is also guaranteed to be walkable even though it is in a skeletal state
   // NOTE: return size is in words not bytes
   // NOTE: tempcount is the current size of the java expression stack. For top most
   //       frames we will allocate a full sized expression stack and not the curback
   //       version that non-top frames have.
   // Calculate the amount our frame will be adjust by the callee. For top frame
   // this is zero.
   // NOTE: ia64 seems to do this wrong (or at least backwards) in that it
   // calculates the extra locals based on itself. Not what the callee does
   // to it. So it ignores last_frame_adjust value. Seems suspicious as far
   // as getting sender_sp correct.
   int extra_locals_size = (callee_locals - callee_param_count) * BytesPerWord;
   int monitor_size = sizeof(BasicObjectLock) * moncount;
   // First calculate the frame size without any java expression stack
   int short_frame_size = size_activation_helper(extra_locals_size,
                                                 monitor_size);
   // Now with full size expression stack
   int full_frame_size = short_frame_size + method->max_stack() * BytesPerWord;
   // and now with only live portion of the expression stack
   short_frame_size = short_frame_size + tempcount * BytesPerWord;
   // the size the activation is right now. Only top frame is full size
   int frame_size = (is_top_frame ? full_frame_size : short_frame_size);
   if (interpreter_frame != NULL) {
 #ifdef ASSERT
     assert(caller->unextended_sp() == interpreter_frame->interpreter_frame_sender_sp(), "Frame not properly walkable");
 #endif
     // MUCHO HACK
     intptr_t* frame_bottom = (intptr_t*) ((intptr_t)interpreter_frame->sp() - (full_frame_size - frame_size));
     /* Now fillin the interpreterState object */
     // The state object is the first thing on the frame and easily located
     interpreterState cur_state = (interpreterState) ((intptr_t)interpreter_frame->fp() - sizeof(BytecodeInterpreter));
     // Find the locals pointer. This is rather simple on x86 because there is no
     // confusing rounding at the callee to account for. We can trivially locate
     // our locals based on the current fp().
     // Note: the + 2 is for handling the "static long no_params() method" issue.
     // (too bad I don't really remember that issue well...)
     intptr_t* locals;
     // If the caller is interpreted we need to make sure that locals points to the first
     // argument that the caller passed and not in an area where the stack might have been extended.
     // because the stack to stack to converter needs a proper locals value in order to remove the
     // arguments from the caller and place the result in the proper location. Hmm maybe it'd be
     // simpler if we simply stored the result in the BytecodeInterpreter object and let the c++ code
     // adjust the stack?? HMMM QQQ
     //
     if (caller->is_interpreted_frame()) {
       // locals must agree with the caller because it will be used to set the
       // caller's tos when we return.
       interpreterState prev  = caller->get_interpreterState();
       // stack() is prepushed.
       locals = prev->stack() + method->size_of_parameters();
       // locals = caller->unextended_sp() + (method->size_of_parameters() - 1);
       if (locals != interpreter_frame->fp() + frame::sender_sp_offset + (method->max_locals() - 1) + 2) {
         // os::breakpoint();
       }
     } else {
       // this is where a c2i would have placed locals (except for the +2)
       locals = interpreter_frame->fp() + frame::sender_sp_offset + (method->max_locals() - 1) + 2;
     }
     intptr_t* monitor_base = (intptr_t*) cur_state;
     intptr_t* stack_base = (intptr_t*) ((intptr_t) monitor_base - monitor_size);
     /* +1 because stack is always prepushed */
     intptr_t* stack = (intptr_t*) ((intptr_t) stack_base - (tempcount + 1) * BytesPerWord);
     BytecodeInterpreter::layout_interpreterState(cur_state,
                                           caller,
                                           interpreter_frame,
                                           method,
                                           locals,
                                           stack,
                                           stack_base,
                                           monitor_base,
                                           frame_bottom,
                                           is_top_frame);
     // BytecodeInterpreter::pd_layout_interpreterState(cur_state, interpreter_return_address, interpreter_frame->fp());
   }
   return frame_size/BytesPerWord;
 }
 #endif // CC_INTERP (all)

Mercurial > jdk8-mips64-public > hotspot / annotate

src/cpu/x86/vm/cppInterpreter_x86.cpp@a61af66fc99e (annotated)

src/cpu/x86/vm/cppInterpreter_x86.cpp