jdk8-mips64-public/hotspot: src/cpu/sparc/vm/sharedRuntime

src/cpu/sparc/vm/sharedRuntime_sparc.cpp@a6e09d6dd8e5 (annotated)

src/cpu/sparc/vm/sharedRuntime_sparc.cpp

Wed, 24 Apr 2013 20:55:28 -0400

author: dlong
date: Wed, 24 Apr 2013 20:55:28 -0400
changeset 5000: a6e09d6dd8e5
parent 4323: f0c2369fda5a
child 5283: 46c544b8fbfc
permissions: -rw-r--r--

8003853: specify offset of IC load in java_to_interp stub
Summary: refactored code to allow platform-specific differences
Reviewed-by: dlong, twisti
Contributed-by: Goetz Lindenmaier <goetz.lindenmaier@sap.com>

 /*
  * Copyright (c) 2003, 2012, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #include "precompiled.hpp"
 #include "asm/macroAssembler.inline.hpp"
 #include "code/debugInfoRec.hpp"
 #include "code/icBuffer.hpp"
 #include "code/vtableStubs.hpp"
 #include "interpreter/interpreter.hpp"
 #include "oops/compiledICHolder.hpp"
 #include "prims/jvmtiRedefineClassesTrace.hpp"
 #include "runtime/sharedRuntime.hpp"
 #include "runtime/vframeArray.hpp"
 #include "vmreg_sparc.inline.hpp"
 #ifdef COMPILER1
 #include "c1/c1_Runtime1.hpp"
 #endif
 #ifdef COMPILER2
 #include "opto/runtime.hpp"
 #endif
 #ifdef SHARK
 #include "compiler/compileBroker.hpp"
 #include "shark/sharkCompiler.hpp"
 #endif
 #define __ masm->
 class RegisterSaver {
   // Used for saving volatile registers. This is Gregs, Fregs, I/L/O.
   // The Oregs are problematic. In the 32bit build the compiler can
   // have O registers live with 64 bit quantities. A window save will
   // cut the heads off of the registers. We have to do a very extensive
   // stack dance to save and restore these properly.
   // Note that the Oregs problem only exists if we block at either a polling
   // page exception a compiled code safepoint that was not originally a call
   // or deoptimize following one of these kinds of safepoints.
   // Lots of registers to save.  For all builds, a window save will preserve
   // the %i and %l registers.  For the 32-bit longs-in-two entries and 64-bit
   // builds a window-save will preserve the %o registers.  In the LION build
   // we need to save the 64-bit %o registers which requires we save them
   // before the window-save (as then they become %i registers and get their
   // heads chopped off on interrupt).  We have to save some %g registers here
   // as well.
   enum {
     // This frame's save area.  Includes extra space for the native call:
     // vararg's layout space and the like.  Briefly holds the caller's
     // register save area.
     call_args_area = frame::register_save_words_sp_offset +
                      frame::memory_parameter_word_sp_offset*wordSize,
     // Make sure save locations are always 8 byte aligned.
     // can't use round_to because it doesn't produce compile time constant
     start_of_extra_save_area = ((call_args_area + 7) & ~7),
     g1_offset = start_of_extra_save_area, // g-regs needing saving
     g3_offset = g1_offset+8,
     g4_offset = g3_offset+8,
     g5_offset = g4_offset+8,
     o0_offset = g5_offset+8,
     o1_offset = o0_offset+8,
     o2_offset = o1_offset+8,
     o3_offset = o2_offset+8,
     o4_offset = o3_offset+8,
     o5_offset = o4_offset+8,
     start_of_flags_save_area = o5_offset+8,
     ccr_offset = start_of_flags_save_area,
     fsr_offset = ccr_offset + 8,
     d00_offset = fsr_offset+8,  // Start of float save area
     register_save_size = d00_offset+8*32
   };
   public:
   static int Oexception_offset() { return o0_offset; };
   static int G3_offset() { return g3_offset; };
   static int G5_offset() { return g5_offset; };
   static OopMap* save_live_registers(MacroAssembler* masm, int additional_frame_words, int* total_frame_words);
   static void restore_live_registers(MacroAssembler* masm);
   // During deoptimization only the result register need to be restored
   // all the other values have already been extracted.
   static void restore_result_registers(MacroAssembler* masm);
 };
 OopMap* RegisterSaver::save_live_registers(MacroAssembler* masm, int additional_frame_words, int* total_frame_words) {
   // Record volatile registers as callee-save values in an OopMap so their save locations will be
   // propagated to the caller frame's RegisterMap during StackFrameStream construction (needed for
   // deoptimization; see compiledVFrame::create_stack_value).  The caller's I, L and O registers
   // are saved in register windows - I's and L's in the caller's frame and O's in the stub frame
   // (as the stub's I's) when the runtime routine called by the stub creates its frame.
   int i;
   // Always make the frame size 16 byte aligned.
   int frame_size = round_to(additional_frame_words + register_save_size, 16);
   // OopMap frame size is in c2 stack slots (sizeof(jint)) not bytes or words
   int frame_size_in_slots = frame_size / sizeof(jint);
   // CodeBlob frame size is in words.
   *total_frame_words = frame_size / wordSize;
   // OopMap* map = new OopMap(*total_frame_words, 0);
   OopMap* map = new OopMap(frame_size_in_slots, 0);
 #if !defined(_LP64)
   // Save 64-bit O registers; they will get their heads chopped off on a 'save'.
   __ stx(O0, G2_thread, JavaThread::o_reg_temps_offset_in_bytes()+0*8);
   __ stx(O1, G2_thread, JavaThread::o_reg_temps_offset_in_bytes()+1*8);
   __ stx(O2, G2_thread, JavaThread::o_reg_temps_offset_in_bytes()+2*8);
   __ stx(O3, G2_thread, JavaThread::o_reg_temps_offset_in_bytes()+3*8);
   __ stx(O4, G2_thread, JavaThread::o_reg_temps_offset_in_bytes()+4*8);
   __ stx(O5, G2_thread, JavaThread::o_reg_temps_offset_in_bytes()+5*8);
 #endif /* _LP64 */
   __ save(SP, -frame_size, SP);
 #ifndef _LP64
   // Reload the 64 bit Oregs. Although they are now Iregs we load them
   // to Oregs here to avoid interrupts cutting off their heads
   __ ldx(G2_thread, JavaThread::o_reg_temps_offset_in_bytes()+0*8, O0);
   __ ldx(G2_thread, JavaThread::o_reg_temps_offset_in_bytes()+1*8, O1);
   __ ldx(G2_thread, JavaThread::o_reg_temps_offset_in_bytes()+2*8, O2);
   __ ldx(G2_thread, JavaThread::o_reg_temps_offset_in_bytes()+3*8, O3);
   __ ldx(G2_thread, JavaThread::o_reg_temps_offset_in_bytes()+4*8, O4);
   __ ldx(G2_thread, JavaThread::o_reg_temps_offset_in_bytes()+5*8, O5);
   __ stx(O0, SP, o0_offset+STACK_BIAS);
   map->set_callee_saved(VMRegImpl::stack2reg((o0_offset + 4)>>2), O0->as_VMReg());
   __ stx(O1, SP, o1_offset+STACK_BIAS);
   map->set_callee_saved(VMRegImpl::stack2reg((o1_offset + 4)>>2), O1->as_VMReg());
   __ stx(O2, SP, o2_offset+STACK_BIAS);
   map->set_callee_saved(VMRegImpl::stack2reg((o2_offset + 4)>>2), O2->as_VMReg());
   __ stx(O3, SP, o3_offset+STACK_BIAS);
   map->set_callee_saved(VMRegImpl::stack2reg((o3_offset + 4)>>2), O3->as_VMReg());
   __ stx(O4, SP, o4_offset+STACK_BIAS);
   map->set_callee_saved(VMRegImpl::stack2reg((o4_offset + 4)>>2), O4->as_VMReg());
   __ stx(O5, SP, o5_offset+STACK_BIAS);
   map->set_callee_saved(VMRegImpl::stack2reg((o5_offset + 4)>>2), O5->as_VMReg());
 #endif /* _LP64 */
 #ifdef _LP64
   int debug_offset = 0;
 #else
   int debug_offset = 4;
 #endif
   // Save the G's
   __ stx(G1, SP, g1_offset+STACK_BIAS);
   map->set_callee_saved(VMRegImpl::stack2reg((g1_offset + debug_offset)>>2), G1->as_VMReg());
   __ stx(G3, SP, g3_offset+STACK_BIAS);
   map->set_callee_saved(VMRegImpl::stack2reg((g3_offset + debug_offset)>>2), G3->as_VMReg());
   __ stx(G4, SP, g4_offset+STACK_BIAS);
   map->set_callee_saved(VMRegImpl::stack2reg((g4_offset + debug_offset)>>2), G4->as_VMReg());
   __ stx(G5, SP, g5_offset+STACK_BIAS);
   map->set_callee_saved(VMRegImpl::stack2reg((g5_offset + debug_offset)>>2), G5->as_VMReg());
   // This is really a waste but we'll keep things as they were for now
   if (true) {
 #ifndef _LP64
     map->set_callee_saved(VMRegImpl::stack2reg((o0_offset)>>2), O0->as_VMReg()->next());
     map->set_callee_saved(VMRegImpl::stack2reg((o1_offset)>>2), O1->as_VMReg()->next());
     map->set_callee_saved(VMRegImpl::stack2reg((o2_offset)>>2), O2->as_VMReg()->next());
     map->set_callee_saved(VMRegImpl::stack2reg((o3_offset)>>2), O3->as_VMReg()->next());
     map->set_callee_saved(VMRegImpl::stack2reg((o4_offset)>>2), O4->as_VMReg()->next());
     map->set_callee_saved(VMRegImpl::stack2reg((o5_offset)>>2), O5->as_VMReg()->next());
     map->set_callee_saved(VMRegImpl::stack2reg((g1_offset)>>2), G1->as_VMReg()->next());
     map->set_callee_saved(VMRegImpl::stack2reg((g3_offset)>>2), G3->as_VMReg()->next());
     map->set_callee_saved(VMRegImpl::stack2reg((g4_offset)>>2), G4->as_VMReg()->next());
     map->set_callee_saved(VMRegImpl::stack2reg((g5_offset)>>2), G5->as_VMReg()->next());
 #endif /* _LP64 */
   }
   // Save the flags
   __ rdccr( G5 );
   __ stx(G5, SP, ccr_offset+STACK_BIAS);
   __ stxfsr(SP, fsr_offset+STACK_BIAS);
   // Save all the FP registers: 32 doubles (32 floats correspond to the 2 halves of the first 16 doubles)
   int offset = d00_offset;
   for( int i=0; i<FloatRegisterImpl::number_of_registers; i+=2 ) {
     FloatRegister f = as_FloatRegister(i);
     __ stf(FloatRegisterImpl::D,  f, SP, offset+STACK_BIAS);
     // Record as callee saved both halves of double registers (2 float registers).
     map->set_callee_saved(VMRegImpl::stack2reg(offset>>2), f->as_VMReg());
     map->set_callee_saved(VMRegImpl::stack2reg((offset + sizeof(float))>>2), f->as_VMReg()->next());
     offset += sizeof(double);
   }
   // And we're done.
   return map;
 }
 // Pop the current frame and restore all the registers that we
 // saved.
 void RegisterSaver::restore_live_registers(MacroAssembler* masm) {
   // Restore all the FP registers
   for( int i=0; i<FloatRegisterImpl::number_of_registers; i+=2 ) {
     __ ldf(FloatRegisterImpl::D, SP, d00_offset+i*sizeof(float)+STACK_BIAS, as_FloatRegister(i));
   }
   __ ldx(SP, ccr_offset+STACK_BIAS, G1);
   __ wrccr (G1) ;
   // Restore the G's
   // Note that G2 (AKA GThread) must be saved and restored separately.
   // TODO-FIXME: save and restore some of the other ASRs, viz., %asi and %gsr.
   __ ldx(SP, g1_offset+STACK_BIAS, G1);
   __ ldx(SP, g3_offset+STACK_BIAS, G3);
   __ ldx(SP, g4_offset+STACK_BIAS, G4);
   __ ldx(SP, g5_offset+STACK_BIAS, G5);
 #if !defined(_LP64)
   // Restore the 64-bit O's.
   __ ldx(SP, o0_offset+STACK_BIAS, O0);
   __ ldx(SP, o1_offset+STACK_BIAS, O1);
   __ ldx(SP, o2_offset+STACK_BIAS, O2);
   __ ldx(SP, o3_offset+STACK_BIAS, O3);
   __ ldx(SP, o4_offset+STACK_BIAS, O4);
   __ ldx(SP, o5_offset+STACK_BIAS, O5);
   // And temporarily place them in TLS
   __ stx(O0, G2_thread, JavaThread::o_reg_temps_offset_in_bytes()+0*8);
   __ stx(O1, G2_thread, JavaThread::o_reg_temps_offset_in_bytes()+1*8);
   __ stx(O2, G2_thread, JavaThread::o_reg_temps_offset_in_bytes()+2*8);
   __ stx(O3, G2_thread, JavaThread::o_reg_temps_offset_in_bytes()+3*8);
   __ stx(O4, G2_thread, JavaThread::o_reg_temps_offset_in_bytes()+4*8);
   __ stx(O5, G2_thread, JavaThread::o_reg_temps_offset_in_bytes()+5*8);
 #endif /* _LP64 */
   // Restore flags
   __ ldxfsr(SP, fsr_offset+STACK_BIAS);
   __ restore();
 #if !defined(_LP64)
   // Now reload the 64bit Oregs after we've restore the window.
   __ ldx(G2_thread, JavaThread::o_reg_temps_offset_in_bytes()+0*8, O0);
   __ ldx(G2_thread, JavaThread::o_reg_temps_offset_in_bytes()+1*8, O1);
   __ ldx(G2_thread, JavaThread::o_reg_temps_offset_in_bytes()+2*8, O2);
   __ ldx(G2_thread, JavaThread::o_reg_temps_offset_in_bytes()+3*8, O3);
   __ ldx(G2_thread, JavaThread::o_reg_temps_offset_in_bytes()+4*8, O4);
   __ ldx(G2_thread, JavaThread::o_reg_temps_offset_in_bytes()+5*8, O5);
 #endif /* _LP64 */
 }
 // Pop the current frame and restore the registers that might be holding
 // a result.
 void RegisterSaver::restore_result_registers(MacroAssembler* masm) {
 #if !defined(_LP64)
   // 32bit build returns longs in G1
   __ ldx(SP, g1_offset+STACK_BIAS, G1);
   // Retrieve the 64-bit O's.
   __ ldx(SP, o0_offset+STACK_BIAS, O0);
   __ ldx(SP, o1_offset+STACK_BIAS, O1);
   // and save to TLS
   __ stx(O0, G2_thread, JavaThread::o_reg_temps_offset_in_bytes()+0*8);
   __ stx(O1, G2_thread, JavaThread::o_reg_temps_offset_in_bytes()+1*8);
 #endif /* _LP64 */
   __ ldf(FloatRegisterImpl::D, SP, d00_offset+STACK_BIAS, as_FloatRegister(0));
   __ restore();
 #if !defined(_LP64)
   // Now reload the 64bit Oregs after we've restore the window.
   __ ldx(G2_thread, JavaThread::o_reg_temps_offset_in_bytes()+0*8, O0);
   __ ldx(G2_thread, JavaThread::o_reg_temps_offset_in_bytes()+1*8, O1);
 #endif /* _LP64 */
 }
 // Is vector's size (in bytes) bigger than a size saved by default?
 // 8 bytes FP registers are saved by default on SPARC.
 bool SharedRuntime::is_wide_vector(int size) {
   // Note, MaxVectorSize == 8 on SPARC.
   assert(size <= 8, err_msg_res("%d bytes vectors are not supported", size));
   return size > 8;
 }
 // The java_calling_convention describes stack locations as ideal slots on
 // a frame with no abi restrictions. Since we must observe abi restrictions
 // (like the placement of the register window) the slots must be biased by
 // the following value.
 static int reg2offset(VMReg r) {
   return (r->reg2stack() + SharedRuntime::out_preserve_stack_slots()) * VMRegImpl::stack_slot_size;
 }
 static VMRegPair reg64_to_VMRegPair(Register r) {
   VMRegPair ret;
   if (wordSize == 8) {
     ret.set2(r->as_VMReg());
   } else {
     ret.set_pair(r->successor()->as_VMReg(), r->as_VMReg());
   }
   return ret;
 }
 // ---------------------------------------------------------------------------
 // Read the array of BasicTypes from a signature, and compute where the
 // arguments should go.  Values in the VMRegPair regs array refer to 4-byte (VMRegImpl::stack_slot_size)
 // quantities.  Values less than VMRegImpl::stack0 are registers, those above
 // refer to 4-byte stack slots.  All stack slots are based off of the window
 // top.  VMRegImpl::stack0 refers to the first slot past the 16-word window,
 // and VMRegImpl::stack0+1 refers to the memory word 4-byes higher.  Register
 // values 0-63 (up to RegisterImpl::number_of_registers) are the 64-bit
 // integer registers.  Values 64-95 are the (32-bit only) float registers.
 // Each 32-bit quantity is given its own number, so the integer registers
 // (in either 32- or 64-bit builds) use 2 numbers.  For example, there is
 // an O0-low and an O0-high.  Essentially, all int register numbers are doubled.
 // Register results are passed in O0-O5, for outgoing call arguments.  To
 // convert to incoming arguments, convert all O's to I's.  The regs array
 // refer to the low and hi 32-bit words of 64-bit registers or stack slots.
 // If the regs[].second() field is set to VMRegImpl::Bad(), it means it's unused (a
 // 32-bit value was passed).  If both are VMRegImpl::Bad(), it means no value was
 // passed (used as a placeholder for the other half of longs and doubles in
 // the 64-bit build).  regs[].second() is either VMRegImpl::Bad() or regs[].second() is
 // regs[].first()+1 (regs[].first() may be misaligned in the C calling convention).
 // Sparc never passes a value in regs[].second() but not regs[].first() (regs[].first()
 // == VMRegImpl::Bad() && regs[].second() != VMRegImpl::Bad()) nor unrelated values in the
 // same VMRegPair.
 // Note: the INPUTS in sig_bt are in units of Java argument words, which are
 // either 32-bit or 64-bit depending on the build.  The OUTPUTS are in 32-bit
 // units regardless of build.
 // ---------------------------------------------------------------------------
 // The compiled Java calling convention.  The Java convention always passes
 // 64-bit values in adjacent aligned locations (either registers or stack),
 // floats in float registers and doubles in aligned float pairs.  There is
 // no backing varargs store for values in registers.
 // In the 32-bit build, longs are passed on the stack (cannot be
 // passed in I's, because longs in I's get their heads chopped off at
 // interrupt).
 int SharedRuntime::java_calling_convention(const BasicType *sig_bt,
                                            VMRegPair *regs,
                                            int total_args_passed,
                                            int is_outgoing) {
   assert(F31->as_VMReg()->is_reg(), "overlapping stack/register numbers");
   const int int_reg_max = SPARC_ARGS_IN_REGS_NUM;
   const int flt_reg_max = 8;
   int int_reg = 0;
   int flt_reg = 0;
   int slot = 0;
   for (int i = 0; i < total_args_passed; i++) {
     switch (sig_bt[i]) {
     case T_INT:
     case T_SHORT:
     case T_CHAR:
     case T_BYTE:
     case T_BOOLEAN:
 #ifndef _LP64
     case T_OBJECT:
     case T_ARRAY:
     case T_ADDRESS: // Used, e.g., in slow-path locking for the lock's stack address
 #endif // _LP64
       if (int_reg < int_reg_max) {
         Register r = is_outgoing ? as_oRegister(int_reg++) : as_iRegister(int_reg++);
         regs[i].set1(r->as_VMReg());
       } else {
         regs[i].set1(VMRegImpl::stack2reg(slot++));
       }
       break;
 #ifdef _LP64
     case T_LONG:
       assert(sig_bt[i+1] == T_VOID, "expecting VOID in other half");
       // fall-through
     case T_OBJECT:
     case T_ARRAY:
     case T_ADDRESS: // Used, e.g., in slow-path locking for the lock's stack address
       if (int_reg < int_reg_max) {
         Register r = is_outgoing ? as_oRegister(int_reg++) : as_iRegister(int_reg++);
         regs[i].set2(r->as_VMReg());
       } else {
         slot = round_to(slot, 2);  // align
         regs[i].set2(VMRegImpl::stack2reg(slot));
         slot += 2;
       }
       break;
 #else
     case T_LONG:
       assert(sig_bt[i+1] == T_VOID, "expecting VOID in other half");
       // On 32-bit SPARC put longs always on the stack to keep the pressure off
       // integer argument registers.  They should be used for oops.
       slot = round_to(slot, 2);  // align
       regs[i].set2(VMRegImpl::stack2reg(slot));
       slot += 2;
 #endif
       break;
     case T_FLOAT:
       if (flt_reg < flt_reg_max) {
         FloatRegister r = as_FloatRegister(flt_reg++);
         regs[i].set1(r->as_VMReg());
       } else {
         regs[i].set1(VMRegImpl::stack2reg(slot++));
       }
       break;
     case T_DOUBLE:
       assert(sig_bt[i+1] == T_VOID, "expecting half");
       if (round_to(flt_reg, 2) + 1 < flt_reg_max) {
         flt_reg = round_to(flt_reg, 2);  // align
         FloatRegister r = as_FloatRegister(flt_reg);
         regs[i].set2(r->as_VMReg());
         flt_reg += 2;
       } else {
         slot = round_to(slot, 2);  // align
         regs[i].set2(VMRegImpl::stack2reg(slot));
         slot += 2;
       }
       break;
     case T_VOID:
       regs[i].set_bad();   // Halves of longs & doubles
       break;
     default:
       fatal(err_msg_res("unknown basic type %d", sig_bt[i]));
       break;
     }
   }
   // retun the amount of stack space these arguments will need.
   return slot;
 }
 // Helper class mostly to avoid passing masm everywhere, and handle
 // store displacement overflow logic.
 class AdapterGenerator {
   MacroAssembler *masm;
   Register Rdisp;
   void set_Rdisp(Register r)  { Rdisp = r; }
   void patch_callers_callsite();
   // base+st_off points to top of argument
   int arg_offset(const int st_off) { return st_off; }
   int next_arg_offset(const int st_off) {
     return st_off - Interpreter::stackElementSize;
   }
   // Argument slot values may be loaded first into a register because
   // they might not fit into displacement.
   RegisterOrConstant arg_slot(const int st_off);
   RegisterOrConstant next_arg_slot(const int st_off);
   // Stores long into offset pointed to by base
   void store_c2i_long(Register r, Register base,
                       const int st_off, bool is_stack);
   void store_c2i_object(Register r, Register base,
                         const int st_off);
   void store_c2i_int(Register r, Register base,
                      const int st_off);
   void store_c2i_double(VMReg r_2,
                         VMReg r_1, Register base, const int st_off);
   void store_c2i_float(FloatRegister f, Register base,
                        const int st_off);
  public:
   void gen_c2i_adapter(int total_args_passed,
                               // VMReg max_arg,
                               int comp_args_on_stack, // VMRegStackSlots
                               const BasicType *sig_bt,
                               const VMRegPair *regs,
                               Label& skip_fixup);
   void gen_i2c_adapter(int total_args_passed,
                               // VMReg max_arg,
                               int comp_args_on_stack, // VMRegStackSlots
                               const BasicType *sig_bt,
                               const VMRegPair *regs);
   AdapterGenerator(MacroAssembler *_masm) : masm(_masm) {}
 };
 // Patch the callers callsite with entry to compiled code if it exists.
 void AdapterGenerator::patch_callers_callsite() {
   Label L;
   __ ld_ptr(G5_method, in_bytes(Method::code_offset()), G3_scratch);
   __ br_null(G3_scratch, false, Assembler::pt, L);
   __ delayed()->nop();
   // Call into the VM to patch the caller, then jump to compiled callee
   __ save_frame(4);     // Args in compiled layout; do not blow them
   // Must save all the live Gregs the list is:
   // G1: 1st Long arg (32bit build)
   // G2: global allocated to TLS
   // G3: used in inline cache check (scratch)
   // G4: 2nd Long arg (32bit build);
   // G5: used in inline cache check (Method*)
   // The longs must go to the stack by hand since in the 32 bit build they can be trashed by window ops.
 #ifdef _LP64
   // mov(s,d)
   __ mov(G1, L1);
   __ mov(G4, L4);
   __ mov(G5_method, L5);
   __ mov(G5_method, O0);         // VM needs target method
   __ mov(I7, O1);                // VM needs caller's callsite
   // Must be a leaf call...
   // can be very far once the blob has been relocated
   AddressLiteral dest(CAST_FROM_FN_PTR(address, SharedRuntime::fixup_callers_callsite));
   __ relocate(relocInfo::runtime_call_type);
   __ jumpl_to(dest, O7, O7);
   __ delayed()->mov(G2_thread, L7_thread_cache);
   __ mov(L7_thread_cache, G2_thread);
   __ mov(L1, G1);
   __ mov(L4, G4);
   __ mov(L5, G5_method);
 #else
   __ stx(G1, FP, -8 + STACK_BIAS);
   __ stx(G4, FP, -16 + STACK_BIAS);
   __ mov(G5_method, L5);
   __ mov(G5_method, O0);         // VM needs target method
   __ mov(I7, O1);                // VM needs caller's callsite
   // Must be a leaf call...
   __ call(CAST_FROM_FN_PTR(address, SharedRuntime::fixup_callers_callsite), relocInfo::runtime_call_type);
   __ delayed()->mov(G2_thread, L7_thread_cache);
   __ mov(L7_thread_cache, G2_thread);
   __ ldx(FP, -8 + STACK_BIAS, G1);
   __ ldx(FP, -16 + STACK_BIAS, G4);
   __ mov(L5, G5_method);
 #endif /* _LP64 */
   __ restore();      // Restore args
   __ bind(L);
 }
 RegisterOrConstant AdapterGenerator::arg_slot(const int st_off) {
   RegisterOrConstant roc(arg_offset(st_off));
   return __ ensure_simm13_or_reg(roc, Rdisp);
 }
 RegisterOrConstant AdapterGenerator::next_arg_slot(const int st_off) {
   RegisterOrConstant roc(next_arg_offset(st_off));
   return __ ensure_simm13_or_reg(roc, Rdisp);
 }
 // Stores long into offset pointed to by base
 void AdapterGenerator::store_c2i_long(Register r, Register base,
                                       const int st_off, bool is_stack) {
 #ifdef _LP64
   // In V9, longs are given 2 64-bit slots in the interpreter, but the
   // data is passed in only 1 slot.
   __ stx(r, base, next_arg_slot(st_off));
 #else
 #ifdef COMPILER2
   // Misaligned store of 64-bit data
   __ stw(r, base, arg_slot(st_off));    // lo bits
   __ srlx(r, 32, r);
   __ stw(r, base, next_arg_slot(st_off));  // hi bits
 #else
   if (is_stack) {
     // Misaligned store of 64-bit data
     __ stw(r, base, arg_slot(st_off));    // lo bits
     __ srlx(r, 32, r);
     __ stw(r, base, next_arg_slot(st_off));  // hi bits
   } else {
     __ stw(r->successor(), base, arg_slot(st_off)     ); // lo bits
     __ stw(r             , base, next_arg_slot(st_off)); // hi bits
   }
 #endif // COMPILER2
 #endif // _LP64
 }
 void AdapterGenerator::store_c2i_object(Register r, Register base,
                       const int st_off) {
   __ st_ptr (r, base, arg_slot(st_off));
 }
 void AdapterGenerator::store_c2i_int(Register r, Register base,
                    const int st_off) {
   __ st (r, base, arg_slot(st_off));
 }
 // Stores into offset pointed to by base
 void AdapterGenerator::store_c2i_double(VMReg r_2,
                       VMReg r_1, Register base, const int st_off) {
 #ifdef _LP64
   // In V9, doubles are given 2 64-bit slots in the interpreter, but the
   // data is passed in only 1 slot.
   __ stf(FloatRegisterImpl::D, r_1->as_FloatRegister(), base, next_arg_slot(st_off));
 #else
   // Need to marshal 64-bit value from misaligned Lesp loads
   __ stf(FloatRegisterImpl::S, r_1->as_FloatRegister(), base, next_arg_slot(st_off));
   __ stf(FloatRegisterImpl::S, r_2->as_FloatRegister(), base, arg_slot(st_off) );
 #endif
 }
 void AdapterGenerator::store_c2i_float(FloatRegister f, Register base,
                                        const int st_off) {
   __ stf(FloatRegisterImpl::S, f, base, arg_slot(st_off));
 }
 void AdapterGenerator::gen_c2i_adapter(
                             int total_args_passed,
                             // VMReg max_arg,
                             int comp_args_on_stack, // VMRegStackSlots
                             const BasicType *sig_bt,
                             const VMRegPair *regs,
                             Label& L_skip_fixup) {
   // Before we get into the guts of the C2I adapter, see if we should be here
   // at all.  We've come from compiled code and are attempting to jump to the
   // interpreter, which means the caller made a static call to get here
   // (vcalls always get a compiled target if there is one).  Check for a
   // compiled target.  If there is one, we need to patch the caller's call.
   // However we will run interpreted if we come thru here. The next pass
   // thru the call site will run compiled. If we ran compiled here then
   // we can (theorectically) do endless i2c->c2i->i2c transitions during
   // deopt/uncommon trap cycles. If we always go interpreted here then
   // we can have at most one and don't need to play any tricks to keep
   // from endlessly growing the stack.
   //
   // Actually if we detected that we had an i2c->c2i transition here we
   // ought to be able to reset the world back to the state of the interpreted
   // call and not bother building another interpreter arg area. We don't
   // do that at this point.
   patch_callers_callsite();
   __ bind(L_skip_fixup);
   // Since all args are passed on the stack, total_args_passed*wordSize is the
   // space we need.  Add in varargs area needed by the interpreter. Round up
   // to stack alignment.
   const int arg_size = total_args_passed * Interpreter::stackElementSize;
   const int varargs_area =
                  (frame::varargs_offset - frame::register_save_words)*wordSize;
   const int extraspace = round_to(arg_size + varargs_area, 2*wordSize);
   const int bias = STACK_BIAS;
   const int interp_arg_offset = frame::varargs_offset*wordSize +
                         (total_args_passed-1)*Interpreter::stackElementSize;
   const Register base = SP;
   // Make some extra space on the stack.
   __ sub(SP, __ ensure_simm13_or_reg(extraspace, G3_scratch), SP);
   set_Rdisp(G3_scratch);
   // Write the args into the outgoing interpreter space.
   for (int i = 0; i < total_args_passed; i++) {
     const int st_off = interp_arg_offset - (i*Interpreter::stackElementSize) + bias;
     VMReg r_1 = regs[i].first();
     VMReg r_2 = regs[i].second();
     if (!r_1->is_valid()) {
       assert(!r_2->is_valid(), "");
       continue;
     }
     if (r_1->is_stack()) {        // Pretend stack targets are loaded into G1
       RegisterOrConstant ld_off = reg2offset(r_1) + extraspace + bias;
       ld_off = __ ensure_simm13_or_reg(ld_off, Rdisp);
       r_1 = G1_scratch->as_VMReg();// as part of the load/store shuffle
       if (!r_2->is_valid()) __ ld (base, ld_off, G1_scratch);
       else                  __ ldx(base, ld_off, G1_scratch);
     }
     if (r_1->is_Register()) {
       Register r = r_1->as_Register()->after_restore();
       if (sig_bt[i] == T_OBJECT || sig_bt[i] == T_ARRAY) {
         store_c2i_object(r, base, st_off);
       } else if (sig_bt[i] == T_LONG || sig_bt[i] == T_DOUBLE) {
         store_c2i_long(r, base, st_off, r_2->is_stack());
       } else {
         store_c2i_int(r, base, st_off);
       }
     } else {
       assert(r_1->is_FloatRegister(), "");
       if (sig_bt[i] == T_FLOAT) {
         store_c2i_float(r_1->as_FloatRegister(), base, st_off);
       } else {
         assert(sig_bt[i] == T_DOUBLE, "wrong type");
         store_c2i_double(r_2, r_1, base, st_off);
       }
     }
   }
   // Load the interpreter entry point.
   __ ld_ptr(G5_method, in_bytes(Method::interpreter_entry_offset()), G3_scratch);
   // Pass O5_savedSP as an argument to the interpreter.
   // The interpreter will restore SP to this value before returning.
   __ add(SP, __ ensure_simm13_or_reg(extraspace, G1), O5_savedSP);
   __ mov((frame::varargs_offset)*wordSize -
 *Interpreter::stackElementSize+bias+BytesPerWord, G1);
   // Jump to the interpreter just as if interpreter was doing it.
   __ jmpl(G3_scratch, 0, G0);
   // Setup Lesp for the call.  Cannot actually set Lesp as the current Lesp
   // (really L0) is in use by the compiled frame as a generic temp.  However,
   // the interpreter does not know where its args are without some kind of
   // arg pointer being passed in.  Pass it in Gargs.
   __ delayed()->add(SP, G1, Gargs);
 }
 static void range_check(MacroAssembler* masm, Register pc_reg, Register temp_reg, Register temp2_reg,
                         address code_start, address code_end,
                         Label& L_ok) {
   Label L_fail;
   __ set(ExternalAddress(code_start), temp_reg);
   __ set(pointer_delta(code_end, code_start, 1), temp2_reg);
   __ cmp(pc_reg, temp_reg);
   __ brx(Assembler::lessEqualUnsigned, false, Assembler::pn, L_fail);
   __ delayed()->add(temp_reg, temp2_reg, temp_reg);
   __ cmp(pc_reg, temp_reg);
   __ cmp_and_brx_short(pc_reg, temp_reg, Assembler::lessUnsigned, Assembler::pt, L_ok);
   __ bind(L_fail);
 }
 void AdapterGenerator::gen_i2c_adapter(
                             int total_args_passed,
                             // VMReg max_arg,
                             int comp_args_on_stack, // VMRegStackSlots
                             const BasicType *sig_bt,
                             const VMRegPair *regs) {
   // Generate an I2C adapter: adjust the I-frame to make space for the C-frame
   // layout.  Lesp was saved by the calling I-frame and will be restored on
   // return.  Meanwhile, outgoing arg space is all owned by the callee
   // C-frame, so we can mangle it at will.  After adjusting the frame size,
   // hoist register arguments and repack other args according to the compiled
   // code convention.  Finally, end in a jump to the compiled code.  The entry
   // point address is the start of the buffer.
   // We will only enter here from an interpreted frame and never from after
   // passing thru a c2i. Azul allowed this but we do not. If we lose the
   // race and use a c2i we will remain interpreted for the race loser(s).
   // This removes all sorts of headaches on the x86 side and also eliminates
   // the possibility of having c2i -> i2c -> c2i -> ... endless transitions.
   // More detail:
   // Adapters can be frameless because they do not require the caller
   // to perform additional cleanup work, such as correcting the stack pointer.
   // An i2c adapter is frameless because the *caller* frame, which is interpreted,
   // routinely repairs its own stack pointer (from interpreter_frame_last_sp),
   // even if a callee has modified the stack pointer.
   // A c2i adapter is frameless because the *callee* frame, which is interpreted,
   // routinely repairs its caller's stack pointer (from sender_sp, which is set
   // up via the senderSP register).
   // In other words, if *either* the caller or callee is interpreted, we can
   // get the stack pointer repaired after a call.
   // This is why c2i and i2c adapters cannot be indefinitely composed.
   // In particular, if a c2i adapter were to somehow call an i2c adapter,
   // both caller and callee would be compiled methods, and neither would
   // clean up the stack pointer changes performed by the two adapters.
   // If this happens, control eventually transfers back to the compiled
   // caller, but with an uncorrected stack, causing delayed havoc.
   if (VerifyAdapterCalls &&
       (Interpreter::code() != NULL || StubRoutines::code1() != NULL)) {
     // So, let's test for cascading c2i/i2c adapters right now.
     //  assert(Interpreter::contains($return_addr) ||
     //         StubRoutines::contains($return_addr),
     //         "i2c adapter must return to an interpreter frame");
     __ block_comment("verify_i2c { ");
     Label L_ok;
     if (Interpreter::code() != NULL)
       range_check(masm, O7, O0, O1,
                   Interpreter::code()->code_start(), Interpreter::code()->code_end(),
                   L_ok);
     if (StubRoutines::code1() != NULL)
       range_check(masm, O7, O0, O1,
                   StubRoutines::code1()->code_begin(), StubRoutines::code1()->code_end(),
                   L_ok);
     if (StubRoutines::code2() != NULL)
       range_check(masm, O7, O0, O1,
                   StubRoutines::code2()->code_begin(), StubRoutines::code2()->code_end(),
                   L_ok);
     const char* msg = "i2c adapter must return to an interpreter frame";
     __ block_comment(msg);
     __ stop(msg);
     __ bind(L_ok);
     __ block_comment("} verify_i2ce ");
   }
   // As you can see from the list of inputs & outputs there are not a lot
   // of temp registers to work with: mostly G1, G3 & G4.
   // Inputs:
   // G2_thread      - TLS
   // G5_method      - Method oop
   // G4 (Gargs)     - Pointer to interpreter's args
   // O0..O4         - free for scratch
   // O5_savedSP     - Caller's saved SP, to be restored if needed
   // O6             - Current SP!
   // O7             - Valid return address
   // L0-L7, I0-I7   - Caller's temps (no frame pushed yet)
   // Outputs:
   // G2_thread      - TLS
   // O0-O5          - Outgoing args in compiled layout
   // O6             - Adjusted or restored SP
   // O7             - Valid return address
   // L0-L7, I0-I7   - Caller's temps (no frame pushed yet)
   // F0-F7          - more outgoing args
   // Gargs is the incoming argument base, and also an outgoing argument.
   __ sub(Gargs, BytesPerWord, Gargs);
   // ON ENTRY TO THE CODE WE ARE MAKING, WE HAVE AN INTERPRETED FRAME
   // WITH O7 HOLDING A VALID RETURN PC
   //
   // |              |
   // :  java stack  :
   // |              |
   // +--------------+ <--- start of outgoing args
   // |   receiver   |   |
   // : rest of args :   |---size is java-arg-words
   // |              |   |
   // +--------------+ <--- O4_args (misaligned) and Lesp if prior is not C2I
   // |              |   |
   // :    unused    :   |---Space for max Java stack, plus stack alignment
   // |              |   |
   // +--------------+ <--- SP + 16*wordsize
   // |              |
   // :    window    :
   // |              |
   // +--------------+ <--- SP
   // WE REPACK THE STACK.  We use the common calling convention layout as
   // discovered by calling SharedRuntime::calling_convention.  We assume it
   // causes an arbitrary shuffle of memory, which may require some register
   // temps to do the shuffle.  We hope for (and optimize for) the case where
   // temps are not needed.  We may have to resize the stack slightly, in case
   // we need alignment padding (32-bit interpreter can pass longs & doubles
   // misaligned, but the compilers expect them aligned).
   //
   // |              |
   // :  java stack  :
   // |              |
   // +--------------+ <--- start of outgoing args
   // |  pad, align  |   |
   // +--------------+   |
   // | ints, longs, |   |
   // |    floats,   |   |---Outgoing stack args.
   // :    doubles   :   |   First few args in registers.
   // |              |   |
   // +--------------+ <--- SP' + 16*wordsize
   // |              |
   // :    window    :
   // |              |
   // +--------------+ <--- SP'
   // ON EXIT FROM THE CODE WE ARE MAKING, WE STILL HAVE AN INTERPRETED FRAME
   // WITH O7 HOLDING A VALID RETURN PC - ITS JUST THAT THE ARGS ARE NOW SETUP
   // FOR COMPILED CODE AND THE FRAME SLIGHTLY GROWN.
   // Cut-out for having no stack args.  Since up to 6 args are passed
   // in registers, we will commonly have no stack args.
   if (comp_args_on_stack > 0) {
     // Convert VMReg stack slots to words.
     int comp_words_on_stack = round_to(comp_args_on_stack*VMRegImpl::stack_slot_size, wordSize)>>LogBytesPerWord;
     // Round up to miminum stack alignment, in wordSize
     comp_words_on_stack = round_to(comp_words_on_stack, 2);
     // Now compute the distance from Lesp to SP.  This calculation does not
     // include the space for total_args_passed because Lesp has not yet popped
     // the arguments.
     __ sub(SP, (comp_words_on_stack)*wordSize, SP);
   }
   // Now generate the shuffle code.  Pick up all register args and move the
   // rest through G1_scratch.
   for (int i = 0; i < total_args_passed; i++) {
     if (sig_bt[i] == T_VOID) {
       // Longs and doubles are passed in native word order, but misaligned
       // in the 32-bit build.
       assert(i > 0 && (sig_bt[i-1] == T_LONG || sig_bt[i-1] == T_DOUBLE), "missing half");
       continue;
     }
     // Pick up 0, 1 or 2 words from Lesp+offset.  Assume mis-aligned in the
     // 32-bit build and aligned in the 64-bit build.  Look for the obvious
     // ldx/lddf optimizations.
     // Load in argument order going down.
     const int ld_off = (total_args_passed-i)*Interpreter::stackElementSize;
     set_Rdisp(G1_scratch);
     VMReg r_1 = regs[i].first();
     VMReg r_2 = regs[i].second();
     if (!r_1->is_valid()) {
       assert(!r_2->is_valid(), "");
       continue;
     }
     if (r_1->is_stack()) {        // Pretend stack targets are loaded into F8/F9
       r_1 = F8->as_VMReg();        // as part of the load/store shuffle
       if (r_2->is_valid()) r_2 = r_1->next();
     }
     if (r_1->is_Register()) {  // Register argument
       Register r = r_1->as_Register()->after_restore();
       if (!r_2->is_valid()) {
         __ ld(Gargs, arg_slot(ld_off), r);
       } else {
 #ifdef _LP64
         // In V9, longs are given 2 64-bit slots in the interpreter, but the
         // data is passed in only 1 slot.
         RegisterOrConstant slot = (sig_bt[i] == T_LONG) ?
               next_arg_slot(ld_off) : arg_slot(ld_off);
         __ ldx(Gargs, slot, r);
 #else
         fatal("longs should be on stack");
 #endif
       }
     } else {
       assert(r_1->is_FloatRegister(), "");
       if (!r_2->is_valid()) {
         __ ldf(FloatRegisterImpl::S, Gargs,      arg_slot(ld_off), r_1->as_FloatRegister());
       } else {
 #ifdef _LP64
         // In V9, doubles are given 2 64-bit slots in the interpreter, but the
         // data is passed in only 1 slot.  This code also handles longs that
         // are passed on the stack, but need a stack-to-stack move through a
         // spare float register.
         RegisterOrConstant slot = (sig_bt[i] == T_LONG || sig_bt[i] == T_DOUBLE) ?
               next_arg_slot(ld_off) : arg_slot(ld_off);
         __ ldf(FloatRegisterImpl::D, Gargs,                  slot, r_1->as_FloatRegister());
 #else
         // Need to marshal 64-bit value from misaligned Lesp loads
         __ ldf(FloatRegisterImpl::S, Gargs, next_arg_slot(ld_off), r_1->as_FloatRegister());
         __ ldf(FloatRegisterImpl::S, Gargs,      arg_slot(ld_off), r_2->as_FloatRegister());
 #endif
       }
     }
     // Was the argument really intended to be on the stack, but was loaded
     // into F8/F9?
     if (regs[i].first()->is_stack()) {
       assert(r_1->as_FloatRegister() == F8, "fix this code");
       // Convert stack slot to an SP offset
       int st_off = reg2offset(regs[i].first()) + STACK_BIAS;
       // Store down the shuffled stack word.  Target address _is_ aligned.
       RegisterOrConstant slot = __ ensure_simm13_or_reg(st_off, Rdisp);
       if (!r_2->is_valid()) __ stf(FloatRegisterImpl::S, r_1->as_FloatRegister(), SP, slot);
       else                  __ stf(FloatRegisterImpl::D, r_1->as_FloatRegister(), SP, slot);
     }
   }
   // Jump to the compiled code just as if compiled code was doing it.
   __ ld_ptr(G5_method, in_bytes(Method::from_compiled_offset()), G3);
   // 6243940 We might end up in handle_wrong_method if
   // the callee is deoptimized as we race thru here. If that
   // happens we don't want to take a safepoint because the
   // caller frame will look interpreted and arguments are now
   // "compiled" so it is much better to make this transition
   // invisible to the stack walking code. Unfortunately if
   // we try and find the callee by normal means a safepoint
   // is possible. So we stash the desired callee in the thread
   // and the vm will find there should this case occur.
   Address callee_target_addr(G2_thread, JavaThread::callee_target_offset());
   __ st_ptr(G5_method, callee_target_addr);
   if (StressNonEntrant) {
     // Open a big window for deopt failure
     __ save_frame(0);
     __ mov(G0, L0);
     Label loop;
     __ bind(loop);
     __ sub(L0, 1, L0);
     __ br_null_short(L0, Assembler::pt, loop);
     __ restore();
   }
   __ jmpl(G3, 0, G0);
   __ delayed()->nop();
 }
 // ---------------------------------------------------------------
 AdapterHandlerEntry* SharedRuntime::generate_i2c2i_adapters(MacroAssembler *masm,
                                                             int total_args_passed,
                                                             // VMReg max_arg,
                                                             int comp_args_on_stack, // VMRegStackSlots
                                                             const BasicType *sig_bt,
                                                             const VMRegPair *regs,
                                                             AdapterFingerPrint* fingerprint) {
   address i2c_entry = __ pc();
   AdapterGenerator agen(masm);
   agen.gen_i2c_adapter(total_args_passed, comp_args_on_stack, sig_bt, regs);
   // -------------------------------------------------------------------------
   // Generate a C2I adapter.  On entry we know G5 holds the Method*.  The
   // args start out packed in the compiled layout.  They need to be unpacked
   // into the interpreter layout.  This will almost always require some stack
   // space.  We grow the current (compiled) stack, then repack the args.  We
   // finally end in a jump to the generic interpreter entry point.  On exit
   // from the interpreter, the interpreter will restore our SP (lest the
   // compiled code, which relys solely on SP and not FP, get sick).
   address c2i_unverified_entry = __ pc();
   Label L_skip_fixup;
   {
     Register R_temp = G1;  // another scratch register
     AddressLiteral ic_miss(SharedRuntime::get_ic_miss_stub());
     __ verify_oop(O0);
     __ load_klass(O0, G3_scratch);
     __ ld_ptr(G5_method, CompiledICHolder::holder_klass_offset(), R_temp);
     __ cmp(G3_scratch, R_temp);
     Label ok, ok2;
     __ brx(Assembler::equal, false, Assembler::pt, ok);
     __ delayed()->ld_ptr(G5_method, CompiledICHolder::holder_method_offset(), G5_method);
     __ jump_to(ic_miss, G3_scratch);
     __ delayed()->nop();
     __ bind(ok);
     // Method might have been compiled since the call site was patched to
     // interpreted if that is the case treat it as a miss so we can get
     // the call site corrected.
     __ ld_ptr(G5_method, in_bytes(Method::code_offset()), G3_scratch);
     __ bind(ok2);
     __ br_null(G3_scratch, false, Assembler::pt, L_skip_fixup);
     __ delayed()->nop();
     __ jump_to(ic_miss, G3_scratch);
     __ delayed()->nop();
   }
   address c2i_entry = __ pc();
   agen.gen_c2i_adapter(total_args_passed, comp_args_on_stack, sig_bt, regs, L_skip_fixup);
   __ flush();
   return AdapterHandlerLibrary::new_entry(fingerprint, i2c_entry, c2i_entry, c2i_unverified_entry);
 }
 // Helper function for native calling conventions
 static VMReg int_stk_helper( int i ) {
   // Bias any stack based VMReg we get by ignoring the window area
   // but not the register parameter save area.
   //
   // This is strange for the following reasons. We'd normally expect
   // the calling convention to return an VMReg for a stack slot
   // completely ignoring any abi reserved area. C2 thinks of that
   // abi area as only out_preserve_stack_slots. This does not include
   // the area allocated by the C abi to store down integer arguments
   // because the java calling convention does not use it. So
   // since c2 assumes that there are only out_preserve_stack_slots
   // to bias the optoregs (which impacts VMRegs) when actually referencing any actual stack
   // location the c calling convention must add in this bias amount
   // to make up for the fact that the out_preserve_stack_slots is
   // insufficient for C calls. What a mess. I sure hope those 6
   // stack words were worth it on every java call!
   // Another way of cleaning this up would be for out_preserve_stack_slots
   // to take a parameter to say whether it was C or java calling conventions.
   // Then things might look a little better (but not much).
   int mem_parm_offset = i - SPARC_ARGS_IN_REGS_NUM;
   if( mem_parm_offset < 0 ) {
     return as_oRegister(i)->as_VMReg();
   } else {
     int actual_offset = (mem_parm_offset + frame::memory_parameter_word_sp_offset) * VMRegImpl::slots_per_word;
     // Now return a biased offset that will be correct when out_preserve_slots is added back in
     return VMRegImpl::stack2reg(actual_offset - SharedRuntime::out_preserve_stack_slots());
   }
 }
 int SharedRuntime::c_calling_convention(const BasicType *sig_bt,
                                          VMRegPair *regs,
                                          int total_args_passed) {
     // Return the number of VMReg stack_slots needed for the args.
     // This value does not include an abi space (like register window
     // save area).
     // The native convention is V8 if !LP64
     // The LP64 convention is the V9 convention which is slightly more sane.
     // We return the amount of VMReg stack slots we need to reserve for all
     // the arguments NOT counting out_preserve_stack_slots. Since we always
     // have space for storing at least 6 registers to memory we start with that.
     // See int_stk_helper for a further discussion.
     int max_stack_slots = (frame::varargs_offset * VMRegImpl::slots_per_word) - SharedRuntime::out_preserve_stack_slots();
 #ifdef _LP64
     // V9 convention: All things "as-if" on double-wide stack slots.
     // Hoist any int/ptr/long's in the first 6 to int regs.
     // Hoist any flt/dbl's in the first 16 dbl regs.
     int j = 0;                  // Count of actual args, not HALVES
     for( int i=0; i<total_args_passed; i++, j++ ) {
       switch( sig_bt[i] ) {
       case T_BOOLEAN:
       case T_BYTE:
       case T_CHAR:
       case T_INT:
       case T_SHORT:
         regs[i].set1( int_stk_helper( j ) ); break;
       case T_LONG:
         assert( sig_bt[i+1] == T_VOID, "expecting half" );
       case T_ADDRESS: // raw pointers, like current thread, for VM calls
       case T_ARRAY:
       case T_OBJECT:
       case T_METADATA:
         regs[i].set2( int_stk_helper( j ) );
         break;
       case T_FLOAT:
         if ( j < 16 ) {
           // V9ism: floats go in ODD registers
           regs[i].set1(as_FloatRegister(1 + (j<<1))->as_VMReg());
         } else {
           // V9ism: floats go in ODD stack slot
           regs[i].set1(VMRegImpl::stack2reg(1 + (j<<1)));
         }
         break;
       case T_DOUBLE:
         assert( sig_bt[i+1] == T_VOID, "expecting half" );
         if ( j < 16 ) {
           // V9ism: doubles go in EVEN/ODD regs
           regs[i].set2(as_FloatRegister(j<<1)->as_VMReg());
         } else {
           // V9ism: doubles go in EVEN/ODD stack slots
           regs[i].set2(VMRegImpl::stack2reg(j<<1));
         }
         break;
       case T_VOID:  regs[i].set_bad(); j--; break; // Do not count HALVES
       default:
         ShouldNotReachHere();
       }
       if (regs[i].first()->is_stack()) {
         int off =  regs[i].first()->reg2stack();
         if (off > max_stack_slots) max_stack_slots = off;
       }
       if (regs[i].second()->is_stack()) {
         int off =  regs[i].second()->reg2stack();
         if (off > max_stack_slots) max_stack_slots = off;
       }
     }
 #else // _LP64
     // V8 convention: first 6 things in O-regs, rest on stack.
     // Alignment is willy-nilly.
     for( int i=0; i<total_args_passed; i++ ) {
       switch( sig_bt[i] ) {
       case T_ADDRESS: // raw pointers, like current thread, for VM calls
       case T_ARRAY:
       case T_BOOLEAN:
       case T_BYTE:
       case T_CHAR:
       case T_FLOAT:
       case T_INT:
       case T_OBJECT:
       case T_METADATA:
       case T_SHORT:
         regs[i].set1( int_stk_helper( i ) );
         break;
       case T_DOUBLE:
       case T_LONG:
         assert( sig_bt[i+1] == T_VOID, "expecting half" );
         regs[i].set_pair( int_stk_helper( i+1 ), int_stk_helper( i ) );
         break;
       case T_VOID: regs[i].set_bad(); break;
       default:
         ShouldNotReachHere();
       }
       if (regs[i].first()->is_stack()) {
         int off =  regs[i].first()->reg2stack();
         if (off > max_stack_slots) max_stack_slots = off;
       }
       if (regs[i].second()->is_stack()) {
         int off =  regs[i].second()->reg2stack();
         if (off > max_stack_slots) max_stack_slots = off;
       }
     }
 #endif // _LP64
   return round_to(max_stack_slots + 1, 2);
 }
 // ---------------------------------------------------------------------------
 void SharedRuntime::save_native_result(MacroAssembler *masm, BasicType ret_type, int frame_slots) {
   switch (ret_type) {
   case T_FLOAT:
     __ stf(FloatRegisterImpl::S, F0, SP, frame_slots*VMRegImpl::stack_slot_size - 4+STACK_BIAS);
     break;
   case T_DOUBLE:
     __ stf(FloatRegisterImpl::D, F0, SP, frame_slots*VMRegImpl::stack_slot_size - 8+STACK_BIAS);
     break;
   }
 }
 void SharedRuntime::restore_native_result(MacroAssembler *masm, BasicType ret_type, int frame_slots) {
   switch (ret_type) {
   case T_FLOAT:
     __ ldf(FloatRegisterImpl::S, SP, frame_slots*VMRegImpl::stack_slot_size - 4+STACK_BIAS, F0);
     break;
   case T_DOUBLE:
     __ ldf(FloatRegisterImpl::D, SP, frame_slots*VMRegImpl::stack_slot_size - 8+STACK_BIAS, F0);
     break;
   }
 }
 // Check and forward and pending exception.  Thread is stored in
 // L7_thread_cache and possibly NOT in G2_thread.  Since this is a native call, there
 // is no exception handler.  We merely pop this frame off and throw the
 // exception in the caller's frame.
 static void check_forward_pending_exception(MacroAssembler *masm, Register Rex_oop) {
   Label L;
   __ br_null(Rex_oop, false, Assembler::pt, L);
   __ delayed()->mov(L7_thread_cache, G2_thread); // restore in case we have exception
   // Since this is a native call, we *know* the proper exception handler
   // without calling into the VM: it's the empty function.  Just pop this
   // frame and then jump to forward_exception_entry; O7 will contain the
   // native caller's return PC.
  AddressLiteral exception_entry(StubRoutines::forward_exception_entry());
   __ jump_to(exception_entry, G3_scratch);
   __ delayed()->restore();      // Pop this frame off.
   __ bind(L);
 }
 // A simple move of integer like type
 static void simple_move32(MacroAssembler* masm, VMRegPair src, VMRegPair dst) {
   if (src.first()->is_stack()) {
     if (dst.first()->is_stack()) {
       // stack to stack
       __ ld(FP, reg2offset(src.first()) + STACK_BIAS, L5);
       __ st(L5, SP, reg2offset(dst.first()) + STACK_BIAS);
     } else {
       // stack to reg
       __ ld(FP, reg2offset(src.first()) + STACK_BIAS, dst.first()->as_Register());
     }
   } else if (dst.first()->is_stack()) {
     // reg to stack
     __ st(src.first()->as_Register(), SP, reg2offset(dst.first()) + STACK_BIAS);
   } else {
     __ mov(src.first()->as_Register(), dst.first()->as_Register());
   }
 }
 // On 64 bit we will store integer like items to the stack as
 // 64 bits items (sparc abi) even though java would only store
 // 32bits for a parameter. On 32bit it will simply be 32 bits
 // So this routine will do 32->32 on 32bit and 32->64 on 64bit
 static void move32_64(MacroAssembler* masm, VMRegPair src, VMRegPair dst) {
   if (src.first()->is_stack()) {
     if (dst.first()->is_stack()) {
       // stack to stack
       __ ld(FP, reg2offset(src.first()) + STACK_BIAS, L5);
       __ st_ptr(L5, SP, reg2offset(dst.first()) + STACK_BIAS);
     } else {
       // stack to reg
       __ ld(FP, reg2offset(src.first()) + STACK_BIAS, dst.first()->as_Register());
     }
   } else if (dst.first()->is_stack()) {
     // reg to stack
     __ st_ptr(src.first()->as_Register(), SP, reg2offset(dst.first()) + STACK_BIAS);
   } else {
     __ mov(src.first()->as_Register(), dst.first()->as_Register());
   }
 }
 static void move_ptr(MacroAssembler* masm, VMRegPair src, VMRegPair dst) {
   if (src.first()->is_stack()) {
     if (dst.first()->is_stack()) {
       // stack to stack
       __ ld_ptr(FP, reg2offset(src.first()) + STACK_BIAS, L5);
       __ st_ptr(L5, SP, reg2offset(dst.first()) + STACK_BIAS);
     } else {
       // stack to reg
       __ ld_ptr(FP, reg2offset(src.first()) + STACK_BIAS, dst.first()->as_Register());
     }
   } else if (dst.first()->is_stack()) {
     // reg to stack
     __ st_ptr(src.first()->as_Register(), SP, reg2offset(dst.first()) + STACK_BIAS);
   } else {
     __ mov(src.first()->as_Register(), dst.first()->as_Register());
   }
 }
 // An oop arg. Must pass a handle not the oop itself
 static void object_move(MacroAssembler* masm,
                         OopMap* map,
                         int oop_handle_offset,
                         int framesize_in_slots,
                         VMRegPair src,
                         VMRegPair dst,
                         bool is_receiver,
                         int* receiver_offset) {
   // must pass a handle. First figure out the location we use as a handle
   if (src.first()->is_stack()) {
     // Oop is already on the stack
     Register rHandle = dst.first()->is_stack() ? L5 : dst.first()->as_Register();
     __ add(FP, reg2offset(src.first()) + STACK_BIAS, rHandle);
     __ ld_ptr(rHandle, 0, L4);
 #ifdef _LP64
     __ movr( Assembler::rc_z, L4, G0, rHandle );
 #else
     __ tst( L4 );
     __ movcc( Assembler::zero, false, Assembler::icc, G0, rHandle );
 #endif
     if (dst.first()->is_stack()) {
       __ st_ptr(rHandle, SP, reg2offset(dst.first()) + STACK_BIAS);
     }
     int offset_in_older_frame = src.first()->reg2stack() + SharedRuntime::out_preserve_stack_slots();
     if (is_receiver) {
       *receiver_offset = (offset_in_older_frame + framesize_in_slots) * VMRegImpl::stack_slot_size;
     }
     map->set_oop(VMRegImpl::stack2reg(offset_in_older_frame + framesize_in_slots));
   } else {
     // Oop is in an input register pass we must flush it to the stack
     const Register rOop = src.first()->as_Register();
     const Register rHandle = L5;
     int oop_slot = rOop->input_number() * VMRegImpl::slots_per_word + oop_handle_offset;
     int offset = oop_slot*VMRegImpl::stack_slot_size;
     Label skip;
     __ st_ptr(rOop, SP, offset + STACK_BIAS);
     if (is_receiver) {
       *receiver_offset = oop_slot * VMRegImpl::stack_slot_size;
     }
     map->set_oop(VMRegImpl::stack2reg(oop_slot));
     __ add(SP, offset + STACK_BIAS, rHandle);
 #ifdef _LP64
     __ movr( Assembler::rc_z, rOop, G0, rHandle );
 #else
     __ tst( rOop );
     __ movcc( Assembler::zero, false, Assembler::icc, G0, rHandle );
 #endif
     if (dst.first()->is_stack()) {
       __ st_ptr(rHandle, SP, reg2offset(dst.first()) + STACK_BIAS);
     } else {
       __ mov(rHandle, dst.first()->as_Register());
     }
   }
 }
 // A float arg may have to do float reg int reg conversion
 static void float_move(MacroAssembler* masm, VMRegPair src, VMRegPair dst) {
   assert(!src.second()->is_valid() && !dst.second()->is_valid(), "bad float_move");
   if (src.first()->is_stack()) {
     if (dst.first()->is_stack()) {
       // stack to stack the easiest of the bunch
       __ ld(FP, reg2offset(src.first()) + STACK_BIAS, L5);
       __ st(L5, SP, reg2offset(dst.first()) + STACK_BIAS);
     } else {
       // stack to reg
       if (dst.first()->is_Register()) {
         __ ld(FP, reg2offset(src.first()) + STACK_BIAS, dst.first()->as_Register());
       } else {
         __ ldf(FloatRegisterImpl::S, FP, reg2offset(src.first()) + STACK_BIAS, dst.first()->as_FloatRegister());
       }
     }
   } else if (dst.first()->is_stack()) {
     // reg to stack
     if (src.first()->is_Register()) {
       __ st(src.first()->as_Register(), SP, reg2offset(dst.first()) + STACK_BIAS);
     } else {
       __ stf(FloatRegisterImpl::S, src.first()->as_FloatRegister(), SP, reg2offset(dst.first()) + STACK_BIAS);
     }
   } else {
     // reg to reg
     if (src.first()->is_Register()) {
       if (dst.first()->is_Register()) {
         // gpr -> gpr
         __ mov(src.first()->as_Register(), dst.first()->as_Register());
       } else {
         // gpr -> fpr
         __ st(src.first()->as_Register(), FP, -4 + STACK_BIAS);
         __ ldf(FloatRegisterImpl::S, FP, -4 + STACK_BIAS, dst.first()->as_FloatRegister());
       }
     } else if (dst.first()->is_Register()) {
       // fpr -> gpr
       __ stf(FloatRegisterImpl::S, src.first()->as_FloatRegister(), FP, -4 + STACK_BIAS);
       __ ld(FP, -4 + STACK_BIAS, dst.first()->as_Register());
     } else {
       // fpr -> fpr
       // In theory these overlap but the ordering is such that this is likely a nop
       if ( src.first() != dst.first()) {
         __ fmov(FloatRegisterImpl::S, src.first()->as_FloatRegister(), dst.first()->as_FloatRegister());
       }
     }
   }
 }
 static void split_long_move(MacroAssembler* masm, VMRegPair src, VMRegPair dst) {
   VMRegPair src_lo(src.first());
   VMRegPair src_hi(src.second());
   VMRegPair dst_lo(dst.first());
   VMRegPair dst_hi(dst.second());
   simple_move32(masm, src_lo, dst_lo);
   simple_move32(masm, src_hi, dst_hi);
 }
 // A long move
 static void long_move(MacroAssembler* masm, VMRegPair src, VMRegPair dst) {
   // Do the simple ones here else do two int moves
   if (src.is_single_phys_reg() ) {
     if (dst.is_single_phys_reg()) {
       __ mov(src.first()->as_Register(), dst.first()->as_Register());
     } else {
       // split src into two separate registers
       // Remember hi means hi address or lsw on sparc
       // Move msw to lsw
       if (dst.second()->is_reg()) {
         // MSW -> MSW
         __ srax(src.first()->as_Register(), 32, dst.first()->as_Register());
         // Now LSW -> LSW
         // this will only move lo -> lo and ignore hi
         VMRegPair split(dst.second());
         simple_move32(masm, src, split);
       } else {
         VMRegPair split(src.first(), L4->as_VMReg());
         // MSW -> MSW (lo ie. first word)
         __ srax(src.first()->as_Register(), 32, L4);
         split_long_move(masm, split, dst);
       }
     }
   } else if (dst.is_single_phys_reg()) {
     if (src.is_adjacent_aligned_on_stack(2)) {
       __ ldx(FP, reg2offset(src.first()) + STACK_BIAS, dst.first()->as_Register());
     } else {
       // dst is a single reg.
       // Remember lo is low address not msb for stack slots
       // and lo is the "real" register for registers
       // src is
       VMRegPair split;
       if (src.first()->is_reg()) {
         // src.lo (msw) is a reg, src.hi is stk/reg
         // we will move: src.hi (LSW) -> dst.lo, src.lo (MSW) -> src.lo [the MSW is in the LSW of the reg]
         split.set_pair(dst.first(), src.first());
       } else {
         // msw is stack move to L5
         // lsw is stack move to dst.lo (real reg)
         // we will move: src.hi (LSW) -> dst.lo, src.lo (MSW) -> L5
         split.set_pair(dst.first(), L5->as_VMReg());
       }
       // src.lo -> src.lo/L5, src.hi -> dst.lo (the real reg)
       // msw   -> src.lo/L5,  lsw -> dst.lo
       split_long_move(masm, src, split);
       // So dst now has the low order correct position the
       // msw half
       __ sllx(split.first()->as_Register(), 32, L5);
       const Register d = dst.first()->as_Register();
       __ or3(L5, d, d);
     }
   } else {
     // For LP64 we can probably do better.
     split_long_move(masm, src, dst);
   }
 }
 // A double move
 static void double_move(MacroAssembler* masm, VMRegPair src, VMRegPair dst) {
   // The painful thing here is that like long_move a VMRegPair might be
   // 1: a single physical register
   // 2: two physical registers (v8)
   // 3: a physical reg [lo] and a stack slot [hi] (v8)
   // 4: two stack slots
   // Since src is always a java calling convention we know that the src pair
   // is always either all registers or all stack (and aligned?)
   // in a register [lo] and a stack slot [hi]
   if (src.first()->is_stack()) {
     if (dst.first()->is_stack()) {
       // stack to stack the easiest of the bunch
       // ought to be a way to do this where if alignment is ok we use ldd/std when possible
       __ ld(FP, reg2offset(src.first()) + STACK_BIAS, L5);
       __ ld(FP, reg2offset(src.second()) + STACK_BIAS, L4);
       __ st(L5, SP, reg2offset(dst.first()) + STACK_BIAS);
       __ st(L4, SP, reg2offset(dst.second()) + STACK_BIAS);
     } else {
       // stack to reg
       if (dst.second()->is_stack()) {
         // stack -> reg, stack -> stack
         __ ld(FP, reg2offset(src.second()) + STACK_BIAS, L4);
         if (dst.first()->is_Register()) {
           __ ld(FP, reg2offset(src.first()) + STACK_BIAS, dst.first()->as_Register());
         } else {
           __ ldf(FloatRegisterImpl::S, FP, reg2offset(src.first()) + STACK_BIAS, dst.first()->as_FloatRegister());
         }
         // This was missing. (very rare case)
         __ st(L4, SP, reg2offset(dst.second()) + STACK_BIAS);
       } else {
         // stack -> reg
         // Eventually optimize for alignment QQQ
         if (dst.first()->is_Register()) {
           __ ld(FP, reg2offset(src.first()) + STACK_BIAS, dst.first()->as_Register());
           __ ld(FP, reg2offset(src.second()) + STACK_BIAS, dst.second()->as_Register());
         } else {
           __ ldf(FloatRegisterImpl::S, FP, reg2offset(src.first()) + STACK_BIAS, dst.first()->as_FloatRegister());
           __ ldf(FloatRegisterImpl::S, FP, reg2offset(src.second()) + STACK_BIAS, dst.second()->as_FloatRegister());
         }
       }
     }
   } else if (dst.first()->is_stack()) {
     // reg to stack
     if (src.first()->is_Register()) {
       // Eventually optimize for alignment QQQ
       __ st(src.first()->as_Register(), SP, reg2offset(dst.first()) + STACK_BIAS);
       if (src.second()->is_stack()) {
         __ ld(FP, reg2offset(src.second()) + STACK_BIAS, L4);
         __ st(L4, SP, reg2offset(dst.second()) + STACK_BIAS);
       } else {
         __ st(src.second()->as_Register(), SP, reg2offset(dst.second()) + STACK_BIAS);
       }
     } else {
       // fpr to stack
       if (src.second()->is_stack()) {
         ShouldNotReachHere();
       } else {
         // Is the stack aligned?
         if (reg2offset(dst.first()) & 0x7) {
           // No do as pairs
           __ stf(FloatRegisterImpl::S, src.first()->as_FloatRegister(), SP, reg2offset(dst.first()) + STACK_BIAS);
           __ stf(FloatRegisterImpl::S, src.second()->as_FloatRegister(), SP, reg2offset(dst.second()) + STACK_BIAS);
         } else {
           __ stf(FloatRegisterImpl::D, src.first()->as_FloatRegister(), SP, reg2offset(dst.first()) + STACK_BIAS);
         }
       }
     }
   } else {
     // reg to reg
     if (src.first()->is_Register()) {
       if (dst.first()->is_Register()) {
         // gpr -> gpr
         __ mov(src.first()->as_Register(), dst.first()->as_Register());
         __ mov(src.second()->as_Register(), dst.second()->as_Register());
       } else {
         // gpr -> fpr
         // ought to be able to do a single store
         __ stx(src.first()->as_Register(), FP, -8 + STACK_BIAS);
         __ stx(src.second()->as_Register(), FP, -4 + STACK_BIAS);
         // ought to be able to do a single load
         __ ldf(FloatRegisterImpl::S, FP, -8 + STACK_BIAS, dst.first()->as_FloatRegister());
         __ ldf(FloatRegisterImpl::S, FP, -4 + STACK_BIAS, dst.second()->as_FloatRegister());
       }
     } else if (dst.first()->is_Register()) {
       // fpr -> gpr
       // ought to be able to do a single store
       __ stf(FloatRegisterImpl::D, src.first()->as_FloatRegister(), FP, -8 + STACK_BIAS);
       // ought to be able to do a single load
       // REMEMBER first() is low address not LSB
       __ ld(FP, -8 + STACK_BIAS, dst.first()->as_Register());
       if (dst.second()->is_Register()) {
         __ ld(FP, -4 + STACK_BIAS, dst.second()->as_Register());
       } else {
         __ ld(FP, -4 + STACK_BIAS, L4);
         __ st(L4, SP, reg2offset(dst.second()) + STACK_BIAS);
       }
     } else {
       // fpr -> fpr
       // In theory these overlap but the ordering is such that this is likely a nop
       if ( src.first() != dst.first()) {
         __ fmov(FloatRegisterImpl::D, src.first()->as_FloatRegister(), dst.first()->as_FloatRegister());
       }
     }
   }
 }
 // Creates an inner frame if one hasn't already been created, and
 // saves a copy of the thread in L7_thread_cache
 static void create_inner_frame(MacroAssembler* masm, bool* already_created) {
   if (!*already_created) {
     __ save_frame(0);
     // Save thread in L7 (INNER FRAME); it crosses a bunch of VM calls below
     // Don't use save_thread because it smashes G2 and we merely want to save a
     // copy
     __ mov(G2_thread, L7_thread_cache);
     *already_created = true;
   }
 }
 static void save_or_restore_arguments(MacroAssembler* masm,
                                       const int stack_slots,
                                       const int total_in_args,
                                       const int arg_save_area,
                                       OopMap* map,
                                       VMRegPair* in_regs,
                                       BasicType* in_sig_bt) {
   // if map is non-NULL then the code should store the values,
   // otherwise it should load them.
   if (map != NULL) {
     // Fill in the map
     for (int i = 0; i < total_in_args; i++) {
       if (in_sig_bt[i] == T_ARRAY) {
         if (in_regs[i].first()->is_stack()) {
           int offset_in_older_frame = in_regs[i].first()->reg2stack() + SharedRuntime::out_preserve_stack_slots();
           map->set_oop(VMRegImpl::stack2reg(offset_in_older_frame + stack_slots));
         } else if (in_regs[i].first()->is_Register()) {
           map->set_oop(in_regs[i].first());
         } else {
           ShouldNotReachHere();
         }
       }
     }
   }
   // Save or restore double word values
   int handle_index = 0;
   for (int i = 0; i < total_in_args; i++) {
     int slot = handle_index + arg_save_area;
     int offset = slot * VMRegImpl::stack_slot_size;
     if (in_sig_bt[i] == T_LONG && in_regs[i].first()->is_Register()) {
       const Register reg = in_regs[i].first()->as_Register();
       if (reg->is_global()) {
         handle_index += 2;
         assert(handle_index <= stack_slots, "overflow");
         if (map != NULL) {
           __ stx(reg, SP, offset + STACK_BIAS);
         } else {
           __ ldx(SP, offset + STACK_BIAS, reg);
         }
       }
     } else if (in_sig_bt[i] == T_DOUBLE && in_regs[i].first()->is_FloatRegister()) {
       handle_index += 2;
       assert(handle_index <= stack_slots, "overflow");
       if (map != NULL) {
         __ stf(FloatRegisterImpl::D, in_regs[i].first()->as_FloatRegister(), SP, offset + STACK_BIAS);
       } else {
         __ ldf(FloatRegisterImpl::D, SP, offset + STACK_BIAS, in_regs[i].first()->as_FloatRegister());
       }
     }
   }
   // Save floats
   for (int i = 0; i < total_in_args; i++) {
     int slot = handle_index + arg_save_area;
     int offset = slot * VMRegImpl::stack_slot_size;
     if (in_sig_bt[i] == T_FLOAT && in_regs[i].first()->is_FloatRegister()) {
       handle_index++;
       assert(handle_index <= stack_slots, "overflow");
       if (map != NULL) {
         __ stf(FloatRegisterImpl::S, in_regs[i].first()->as_FloatRegister(), SP, offset + STACK_BIAS);
       } else {
         __ ldf(FloatRegisterImpl::S, SP, offset + STACK_BIAS, in_regs[i].first()->as_FloatRegister());
       }
     }
   }
 }
 // Check GC_locker::needs_gc and enter the runtime if it's true.  This
 // keeps a new JNI critical region from starting until a GC has been
 // forced.  Save down any oops in registers and describe them in an
 // OopMap.
 static void check_needs_gc_for_critical_native(MacroAssembler* masm,
                                                const int stack_slots,
                                                const int total_in_args,
                                                const int arg_save_area,
                                                OopMapSet* oop_maps,
                                                VMRegPair* in_regs,
                                                BasicType* in_sig_bt) {
   __ block_comment("check GC_locker::needs_gc");
   Label cont;
   AddressLiteral sync_state(GC_locker::needs_gc_address());
   __ load_bool_contents(sync_state, G3_scratch);
   __ cmp_zero_and_br(Assembler::equal, G3_scratch, cont);
   __ delayed()->nop();
   // Save down any values that are live in registers and call into the
   // runtime to halt for a GC
   OopMap* map = new OopMap(stack_slots * 2, 0 /* arg_slots*/);
   save_or_restore_arguments(masm, stack_slots, total_in_args,
                             arg_save_area, map, in_regs, in_sig_bt);
   __ mov(G2_thread, L7_thread_cache);
   __ set_last_Java_frame(SP, noreg);
   __ block_comment("block_for_jni_critical");
   __ call(CAST_FROM_FN_PTR(address, SharedRuntime::block_for_jni_critical), relocInfo::runtime_call_type);
   __ delayed()->mov(L7_thread_cache, O0);
   oop_maps->add_gc_map( __ offset(), map);
   __ restore_thread(L7_thread_cache); // restore G2_thread
   __ reset_last_Java_frame();
   // Reload all the register arguments
   save_or_restore_arguments(masm, stack_slots, total_in_args,
                             arg_save_area, NULL, in_regs, in_sig_bt);
   __ bind(cont);
 #ifdef ASSERT
   if (StressCriticalJNINatives) {
     // Stress register saving
     OopMap* map = new OopMap(stack_slots * 2, 0 /* arg_slots*/);
     save_or_restore_arguments(masm, stack_slots, total_in_args,
                               arg_save_area, map, in_regs, in_sig_bt);
     // Destroy argument registers
     for (int i = 0; i < total_in_args; i++) {
       if (in_regs[i].first()->is_Register()) {
         const Register reg = in_regs[i].first()->as_Register();
         if (reg->is_global()) {
           __ mov(G0, reg);
         }
       } else if (in_regs[i].first()->is_FloatRegister()) {
         __ fneg(FloatRegisterImpl::D, in_regs[i].first()->as_FloatRegister(), in_regs[i].first()->as_FloatRegister());
       }
     }
     save_or_restore_arguments(masm, stack_slots, total_in_args,
                               arg_save_area, NULL, in_regs, in_sig_bt);
   }
 #endif
 }
 // Unpack an array argument into a pointer to the body and the length
 // if the array is non-null, otherwise pass 0 for both.
 static void unpack_array_argument(MacroAssembler* masm, VMRegPair reg, BasicType in_elem_type, VMRegPair body_arg, VMRegPair length_arg) {
   // Pass the length, ptr pair
   Label is_null, done;
   if (reg.first()->is_stack()) {
     VMRegPair tmp  = reg64_to_VMRegPair(L2);
     // Load the arg up from the stack
     move_ptr(masm, reg, tmp);
     reg = tmp;
   }
   __ cmp(reg.first()->as_Register(), G0);
   __ brx(Assembler::equal, false, Assembler::pt, is_null);
   __ delayed()->add(reg.first()->as_Register(), arrayOopDesc::base_offset_in_bytes(in_elem_type), L4);
   move_ptr(masm, reg64_to_VMRegPair(L4), body_arg);
   __ ld(reg.first()->as_Register(), arrayOopDesc::length_offset_in_bytes(), L4);
   move32_64(masm, reg64_to_VMRegPair(L4), length_arg);
   __ ba_short(done);
   __ bind(is_null);
   // Pass zeros
   move_ptr(masm, reg64_to_VMRegPair(G0), body_arg);
   move32_64(masm, reg64_to_VMRegPair(G0), length_arg);
   __ bind(done);
 }
 static void verify_oop_args(MacroAssembler* masm,
                             methodHandle method,
                             const BasicType* sig_bt,
                             const VMRegPair* regs) {
   Register temp_reg = G5_method;  // not part of any compiled calling seq
   if (VerifyOops) {
     for (int i = 0; i < method->size_of_parameters(); i++) {
       if (sig_bt[i] == T_OBJECT ||
           sig_bt[i] == T_ARRAY) {
         VMReg r = regs[i].first();
         assert(r->is_valid(), "bad oop arg");
         if (r->is_stack()) {
           RegisterOrConstant ld_off = reg2offset(r) + STACK_BIAS;
           ld_off = __ ensure_simm13_or_reg(ld_off, temp_reg);
           __ ld_ptr(SP, ld_off, temp_reg);
           __ verify_oop(temp_reg);
         } else {
           __ verify_oop(r->as_Register());
         }
       }
     }
   }
 }
 static void gen_special_dispatch(MacroAssembler* masm,
                                  methodHandle method,
                                  const BasicType* sig_bt,
                                  const VMRegPair* regs) {
   verify_oop_args(masm, method, sig_bt, regs);
   vmIntrinsics::ID iid = method->intrinsic_id();
   // Now write the args into the outgoing interpreter space
   bool     has_receiver   = false;
   Register receiver_reg   = noreg;
   int      member_arg_pos = -1;
   Register member_reg     = noreg;
   int      ref_kind       = MethodHandles::signature_polymorphic_intrinsic_ref_kind(iid);
   if (ref_kind != 0) {
     member_arg_pos = method->size_of_parameters() - 1;  // trailing MemberName argument
     member_reg = G5_method;  // known to be free at this point
     has_receiver = MethodHandles::ref_kind_has_receiver(ref_kind);
   } else if (iid == vmIntrinsics::_invokeBasic) {
     has_receiver = true;
   } else {
     fatal(err_msg_res("unexpected intrinsic id %d", iid));
   }
   if (member_reg != noreg) {
     // Load the member_arg into register, if necessary.
     SharedRuntime::check_member_name_argument_is_last_argument(method, sig_bt, regs);
     VMReg r = regs[member_arg_pos].first();
     if (r->is_stack()) {
       RegisterOrConstant ld_off = reg2offset(r) + STACK_BIAS;
       ld_off = __ ensure_simm13_or_reg(ld_off, member_reg);
       __ ld_ptr(SP, ld_off, member_reg);
     } else {
       // no data motion is needed
       member_reg = r->as_Register();
     }
   }
   if (has_receiver) {
     // Make sure the receiver is loaded into a register.
     assert(method->size_of_parameters() > 0, "oob");
     assert(sig_bt[0] == T_OBJECT, "receiver argument must be an object");
     VMReg r = regs[0].first();
     assert(r->is_valid(), "bad receiver arg");
     if (r->is_stack()) {
       // Porting note:  This assumes that compiled calling conventions always
       // pass the receiver oop in a register.  If this is not true on some
       // platform, pick a temp and load the receiver from stack.
       fatal("receiver always in a register");
       receiver_reg = G3_scratch;  // known to be free at this point
       RegisterOrConstant ld_off = reg2offset(r) + STACK_BIAS;
       ld_off = __ ensure_simm13_or_reg(ld_off, member_reg);
       __ ld_ptr(SP, ld_off, receiver_reg);
     } else {
       // no data motion is needed
       receiver_reg = r->as_Register();
     }
   }
   // Figure out which address we are really jumping to:
   MethodHandles::generate_method_handle_dispatch(masm, iid,
                                                  receiver_reg, member_reg, /*for_compiler_entry:*/ true);
 }
 // ---------------------------------------------------------------------------
 // Generate a native wrapper for a given method.  The method takes arguments
 // in the Java compiled code convention, marshals them to the native
 // convention (handlizes oops, etc), transitions to native, makes the call,
 // returns to java state (possibly blocking), unhandlizes any result and
 // returns.
 //
 // Critical native functions are a shorthand for the use of
 // GetPrimtiveArrayCritical and disallow the use of any other JNI
 // functions.  The wrapper is expected to unpack the arguments before
 // passing them to the callee and perform checks before and after the
 // native call to ensure that they GC_locker
 // lock_critical/unlock_critical semantics are followed.  Some other
 // parts of JNI setup are skipped like the tear down of the JNI handle
 // block and the check for pending exceptions it's impossible for them
 // to be thrown.
 //
 // They are roughly structured like this:
 //    if (GC_locker::needs_gc())
 //      SharedRuntime::block_for_jni_critical();
 //    tranistion to thread_in_native
 //    unpack arrray arguments and call native entry point
 //    check for safepoint in progress
 //    check if any thread suspend flags are set
 //      call into JVM and possible unlock the JNI critical
 //      if a GC was suppressed while in the critical native.
 //    transition back to thread_in_Java
 //    return to caller
 //
 nmethod* SharedRuntime::generate_native_wrapper(MacroAssembler* masm,
                                                 methodHandle method,
                                                 int compile_id,
                                                 BasicType* in_sig_bt,
                                                 VMRegPair* in_regs,
                                                 BasicType ret_type) {
   if (method->is_method_handle_intrinsic()) {
     vmIntrinsics::ID iid = method->intrinsic_id();
     intptr_t start = (intptr_t)__ pc();
     int vep_offset = ((intptr_t)__ pc()) - start;
     gen_special_dispatch(masm,
                          method,
                          in_sig_bt,
                          in_regs);
     int frame_complete = ((intptr_t)__ pc()) - start;  // not complete, period
     __ flush();
     int stack_slots = SharedRuntime::out_preserve_stack_slots();  // no out slots at all, actually
     return nmethod::new_native_nmethod(method,
                                        compile_id,
                                        masm->code(),
                                        vep_offset,
                                        frame_complete,
                                        stack_slots / VMRegImpl::slots_per_word,
                                        in_ByteSize(-1),
                                        in_ByteSize(-1),
                                        (OopMapSet*)NULL);
   }
   bool is_critical_native = true;
   address native_func = method->critical_native_function();
   if (native_func == NULL) {
     native_func = method->native_function();
     is_critical_native = false;
   }
   assert(native_func != NULL, "must have function");
   // Native nmethod wrappers never take possesion of the oop arguments.
   // So the caller will gc the arguments. The only thing we need an
   // oopMap for is if the call is static
   //
   // An OopMap for lock (and class if static), and one for the VM call itself
   OopMapSet *oop_maps = new OopMapSet();
   intptr_t start = (intptr_t)__ pc();
   // First thing make an ic check to see if we should even be here
   {
     Label L;
     const Register temp_reg = G3_scratch;
     AddressLiteral ic_miss(SharedRuntime::get_ic_miss_stub());
     __ verify_oop(O0);
     __ load_klass(O0, temp_reg);
     __ cmp_and_brx_short(temp_reg, G5_inline_cache_reg, Assembler::equal, Assembler::pt, L);
     __ jump_to(ic_miss, temp_reg);
     __ delayed()->nop();
     __ align(CodeEntryAlignment);
     __ bind(L);
   }
   int vep_offset = ((intptr_t)__ pc()) - start;
 #ifdef COMPILER1
   if (InlineObjectHash && method->intrinsic_id() == vmIntrinsics::_hashCode) {
     // Object.hashCode can pull the hashCode from the header word
     // instead of doing a full VM transition once it's been computed.
     // Since hashCode is usually polymorphic at call sites we can't do
     // this optimization at the call site without a lot of work.
     Label slowCase;
     Register receiver             = O0;
     Register result               = O0;
     Register header               = G3_scratch;
     Register hash                 = G3_scratch; // overwrite header value with hash value
     Register mask                 = G1;         // to get hash field from header
     // Read the header and build a mask to get its hash field.  Give up if the object is not unlocked.
     // We depend on hash_mask being at most 32 bits and avoid the use of
     // hash_mask_in_place because it could be larger than 32 bits in a 64-bit
     // vm: see markOop.hpp.
     __ ld_ptr(receiver, oopDesc::mark_offset_in_bytes(), header);
     __ sethi(markOopDesc::hash_mask, mask);
     __ btst(markOopDesc::unlocked_value, header);
     __ br(Assembler::zero, false, Assembler::pn, slowCase);
     if (UseBiasedLocking) {
       // Check if biased and fall through to runtime if so
       __ delayed()->nop();
       __ btst(markOopDesc::biased_lock_bit_in_place, header);
       __ br(Assembler::notZero, false, Assembler::pn, slowCase);
     }
     __ delayed()->or3(mask, markOopDesc::hash_mask & 0x3ff, mask);
     // Check for a valid (non-zero) hash code and get its value.
 #ifdef _LP64
     __ srlx(header, markOopDesc::hash_shift, hash);
 #else
     __ srl(header, markOopDesc::hash_shift, hash);
 #endif
     __ andcc(hash, mask, hash);
     __ br(Assembler::equal, false, Assembler::pn, slowCase);
     __ delayed()->nop();
     // leaf return.
     __ retl();
     __ delayed()->mov(hash, result);
     __ bind(slowCase);
   }
 #endif // COMPILER1
   // We have received a description of where all the java arg are located
   // on entry to the wrapper. We need to convert these args to where
   // the jni function will expect them. To figure out where they go
   // we convert the java signature to a C signature by inserting
   // the hidden arguments as arg[0] and possibly arg[1] (static method)
   const int total_in_args = method->size_of_parameters();
   int total_c_args = total_in_args;
   int total_save_slots = 6 * VMRegImpl::slots_per_word;
   if (!is_critical_native) {
     total_c_args += 1;
     if (method->is_static()) {
       total_c_args++;
     }
   } else {
     for (int i = 0; i < total_in_args; i++) {
       if (in_sig_bt[i] == T_ARRAY) {
         // These have to be saved and restored across the safepoint
         total_c_args++;
       }
     }
   }
   BasicType* out_sig_bt = NEW_RESOURCE_ARRAY(BasicType, total_c_args);
   VMRegPair* out_regs   = NEW_RESOURCE_ARRAY(VMRegPair, total_c_args);
   BasicType* in_elem_bt = NULL;
   int argc = 0;
   if (!is_critical_native) {
     out_sig_bt[argc++] = T_ADDRESS;
     if (method->is_static()) {
       out_sig_bt[argc++] = T_OBJECT;
     }
     for (int i = 0; i < total_in_args ; i++ ) {
       out_sig_bt[argc++] = in_sig_bt[i];
     }
   } else {
     Thread* THREAD = Thread::current();
     in_elem_bt = NEW_RESOURCE_ARRAY(BasicType, total_in_args);
     SignatureStream ss(method->signature());
     for (int i = 0; i < total_in_args ; i++ ) {
       if (in_sig_bt[i] == T_ARRAY) {
         // Arrays are passed as int, elem* pair
         out_sig_bt[argc++] = T_INT;
         out_sig_bt[argc++] = T_ADDRESS;
         Symbol* atype = ss.as_symbol(CHECK_NULL);
         const char* at = atype->as_C_string();
         if (strlen(at) == 2) {
           assert(at[0] == '[', "must be");
           switch (at[1]) {
             case 'B': in_elem_bt[i]  = T_BYTE; break;
             case 'C': in_elem_bt[i]  = T_CHAR; break;
             case 'D': in_elem_bt[i]  = T_DOUBLE; break;
             case 'F': in_elem_bt[i]  = T_FLOAT; break;
             case 'I': in_elem_bt[i]  = T_INT; break;
             case 'J': in_elem_bt[i]  = T_LONG; break;
             case 'S': in_elem_bt[i]  = T_SHORT; break;
             case 'Z': in_elem_bt[i]  = T_BOOLEAN; break;
             default: ShouldNotReachHere();
           }
         }
       } else {
         out_sig_bt[argc++] = in_sig_bt[i];
         in_elem_bt[i] = T_VOID;
       }
       if (in_sig_bt[i] != T_VOID) {
         assert(in_sig_bt[i] == ss.type(), "must match");
         ss.next();
       }
     }
   }
   // Now figure out where the args must be stored and how much stack space
   // they require (neglecting out_preserve_stack_slots but space for storing
   // the 1st six register arguments). It's weird see int_stk_helper.
   //
   int out_arg_slots;
   out_arg_slots = c_calling_convention(out_sig_bt, out_regs, total_c_args);
   if (is_critical_native) {
     // Critical natives may have to call out so they need a save area
     // for register arguments.
     int double_slots = 0;
     int single_slots = 0;
     for ( int i = 0; i < total_in_args; i++) {
       if (in_regs[i].first()->is_Register()) {
         const Register reg = in_regs[i].first()->as_Register();
         switch (in_sig_bt[i]) {
           case T_ARRAY:
           case T_BOOLEAN:
           case T_BYTE:
           case T_SHORT:
           case T_CHAR:
           case T_INT:  assert(reg->is_in(), "don't need to save these"); break;
           case T_LONG: if (reg->is_global()) double_slots++; break;
           default:  ShouldNotReachHere();
         }
       } else if (in_regs[i].first()->is_FloatRegister()) {
         switch (in_sig_bt[i]) {
           case T_FLOAT:  single_slots++; break;
           case T_DOUBLE: double_slots++; break;
           default:  ShouldNotReachHere();
         }
       }
     }
     total_save_slots = double_slots * 2 + single_slots;
   }
   // Compute framesize for the wrapper.  We need to handlize all oops in
   // registers. We must create space for them here that is disjoint from
   // the windowed save area because we have no control over when we might
   // flush the window again and overwrite values that gc has since modified.
   // (The live window race)
   //
   // We always just allocate 6 word for storing down these object. This allow
   // us to simply record the base and use the Ireg number to decide which
   // slot to use. (Note that the reg number is the inbound number not the
   // outbound number).
   // We must shuffle args to match the native convention, and include var-args space.
   // Calculate the total number of stack slots we will need.
   // First count the abi requirement plus all of the outgoing args
   int stack_slots = SharedRuntime::out_preserve_stack_slots() + out_arg_slots;
   // Now the space for the inbound oop handle area
   int oop_handle_offset = round_to(stack_slots, 2);
   stack_slots += total_save_slots;
   // Now any space we need for handlizing a klass if static method
   int klass_slot_offset = 0;
   int klass_offset = -1;
   int lock_slot_offset = 0;
   bool is_static = false;
   if (method->is_static()) {
     klass_slot_offset = stack_slots;
     stack_slots += VMRegImpl::slots_per_word;
     klass_offset = klass_slot_offset * VMRegImpl::stack_slot_size;
     is_static = true;
   }
   // Plus a lock if needed
   if (method->is_synchronized()) {
     lock_slot_offset = stack_slots;
     stack_slots += VMRegImpl::slots_per_word;
   }
   // Now a place to save return value or as a temporary for any gpr -> fpr moves
   stack_slots += 2;
   // Ok The space we have allocated will look like:
   //
   //
   // FP-> |                     |
   //      |---------------------|
   //      | 2 slots for moves   |
   //      |---------------------|
   //      | lock box (if sync)  |
   //      |---------------------| <- lock_slot_offset
   //      | klass (if static)   |
   //      |---------------------| <- klass_slot_offset
   //      | oopHandle area      |
   //      |---------------------| <- oop_handle_offset
   //      | outbound memory     |
   //      | based arguments     |
   //      |                     |
   //      |---------------------|
   //      | vararg area         |
   //      |---------------------|
   //      |                     |
   // SP-> | out_preserved_slots |
   //
   //
   // Now compute actual number of stack words we need rounding to make
   // stack properly aligned.
   stack_slots = round_to(stack_slots, 2 * VMRegImpl::slots_per_word);
   int stack_size = stack_slots * VMRegImpl::stack_slot_size;
   // Generate stack overflow check before creating frame
   __ generate_stack_overflow_check(stack_size);
   // Generate a new frame for the wrapper.
   __ save(SP, -stack_size, SP);
   int frame_complete = ((intptr_t)__ pc()) - start;
   __ verify_thread();
   if (is_critical_native) {
     check_needs_gc_for_critical_native(masm, stack_slots,  total_in_args,
                                        oop_handle_offset, oop_maps, in_regs, in_sig_bt);
   }
   //
   // We immediately shuffle the arguments so that any vm call we have to
   // make from here on out (sync slow path, jvmti, etc.) we will have
   // captured the oops from our caller and have a valid oopMap for
   // them.
   // -----------------
   // The Grand Shuffle
   //
   // Natives require 1 or 2 extra arguments over the normal ones: the JNIEnv*
   // (derived from JavaThread* which is in L7_thread_cache) and, if static,
   // the class mirror instead of a receiver.  This pretty much guarantees that
   // register layout will not match.  We ignore these extra arguments during
   // the shuffle. The shuffle is described by the two calling convention
   // vectors we have in our possession. We simply walk the java vector to
   // get the source locations and the c vector to get the destinations.
   // Because we have a new window and the argument registers are completely
   // disjoint ( I0 -> O1, I1 -> O2, ...) we have nothing to worry about
   // here.
   // This is a trick. We double the stack slots so we can claim
   // the oops in the caller's frame. Since we are sure to have
   // more args than the caller doubling is enough to make
   // sure we can capture all the incoming oop args from the
   // caller.
   //
   OopMap* map = new OopMap(stack_slots * 2, 0 /* arg_slots*/);
   // Record sp-based slot for receiver on stack for non-static methods
   int receiver_offset = -1;
   // We move the arguments backward because the floating point registers
   // destination will always be to a register with a greater or equal register
   // number or the stack.
 #ifdef ASSERT
   bool reg_destroyed[RegisterImpl::number_of_registers];
   bool freg_destroyed[FloatRegisterImpl::number_of_registers];
   for ( int r = 0 ; r < RegisterImpl::number_of_registers ; r++ ) {
     reg_destroyed[r] = false;
   }
   for ( int f = 0 ; f < FloatRegisterImpl::number_of_registers ; f++ ) {
     freg_destroyed[f] = false;
   }
 #endif /* ASSERT */
   for ( int i = total_in_args - 1, c_arg = total_c_args - 1; i >= 0 ; i--, c_arg-- ) {
 #ifdef ASSERT
     if (in_regs[i].first()->is_Register()) {
       assert(!reg_destroyed[in_regs[i].first()->as_Register()->encoding()], "ack!");
     } else if (in_regs[i].first()->is_FloatRegister()) {
       assert(!freg_destroyed[in_regs[i].first()->as_FloatRegister()->encoding(FloatRegisterImpl::S)], "ack!");
     }
     if (out_regs[c_arg].first()->is_Register()) {
       reg_destroyed[out_regs[c_arg].first()->as_Register()->encoding()] = true;
     } else if (out_regs[c_arg].first()->is_FloatRegister()) {
       freg_destroyed[out_regs[c_arg].first()->as_FloatRegister()->encoding(FloatRegisterImpl::S)] = true;
     }
 #endif /* ASSERT */
     switch (in_sig_bt[i]) {
       case T_ARRAY:
         if (is_critical_native) {
           unpack_array_argument(masm, in_regs[i], in_elem_bt[i], out_regs[c_arg], out_regs[c_arg - 1]);
           c_arg--;
           break;
         }
       case T_OBJECT:
         assert(!is_critical_native, "no oop arguments");
         object_move(masm, map, oop_handle_offset, stack_slots, in_regs[i], out_regs[c_arg],
                     ((i == 0) && (!is_static)),
                     &receiver_offset);
         break;
       case T_VOID:
         break;
       case T_FLOAT:
         float_move(masm, in_regs[i], out_regs[c_arg]);
         break;
       case T_DOUBLE:
         assert( i + 1 < total_in_args &&
                 in_sig_bt[i + 1] == T_VOID &&
                 out_sig_bt[c_arg+1] == T_VOID, "bad arg list");
         double_move(masm, in_regs[i], out_regs[c_arg]);
         break;
       case T_LONG :
         long_move(masm, in_regs[i], out_regs[c_arg]);
         break;
       case T_ADDRESS: assert(false, "found T_ADDRESS in java args");
       default:
         move32_64(masm, in_regs[i], out_regs[c_arg]);
     }
   }
   // Pre-load a static method's oop into O1.  Used both by locking code and
   // the normal JNI call code.
   if (method->is_static() && !is_critical_native) {
     __ set_oop_constant(JNIHandles::make_local(method->method_holder()->java_mirror()), O1);
     // Now handlize the static class mirror in O1.  It's known not-null.
     __ st_ptr(O1, SP, klass_offset + STACK_BIAS);
     map->set_oop(VMRegImpl::stack2reg(klass_slot_offset));
     __ add(SP, klass_offset + STACK_BIAS, O1);
   }
   const Register L6_handle = L6;
   if (method->is_synchronized()) {
     assert(!is_critical_native, "unhandled");
     __ mov(O1, L6_handle);
   }
   // We have all of the arguments setup at this point. We MUST NOT touch any Oregs
   // except O6/O7. So if we must call out we must push a new frame. We immediately
   // push a new frame and flush the windows.
 #ifdef _LP64
   intptr_t thepc = (intptr_t) __ pc();
   {
     address here = __ pc();
     // Call the next instruction
     __ call(here + 8, relocInfo::none);
     __ delayed()->nop();
   }
 #else
   intptr_t thepc = __ load_pc_address(O7, 0);
 #endif /* _LP64 */
   // We use the same pc/oopMap repeatedly when we call out
   oop_maps->add_gc_map(thepc - start, map);
   // O7 now has the pc loaded that we will use when we finally call to native.
   // Save thread in L7; it crosses a bunch of VM calls below
   // Don't use save_thread because it smashes G2 and we merely
   // want to save a copy
   __ mov(G2_thread, L7_thread_cache);
   // If we create an inner frame once is plenty
   // when we create it we must also save G2_thread
   bool inner_frame_created = false;
   // dtrace method entry support
   {
     SkipIfEqual skip_if(
       masm, G3_scratch, &DTraceMethodProbes, Assembler::zero);
     // create inner frame
     __ save_frame(0);
     __ mov(G2_thread, L7_thread_cache);
     __ set_metadata_constant(method(), O1);
     __ call_VM_leaf(L7_thread_cache,
          CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_entry),
          G2_thread, O1);
     __ restore();
   }
   // RedefineClasses() tracing support for obsolete method entry
   if (RC_TRACE_IN_RANGE(0x00001000, 0x00002000)) {
     // create inner frame
     __ save_frame(0);
     __ mov(G2_thread, L7_thread_cache);
     __ set_metadata_constant(method(), O1);
     __ call_VM_leaf(L7_thread_cache,
          CAST_FROM_FN_PTR(address, SharedRuntime::rc_trace_method_entry),
          G2_thread, O1);
     __ restore();
   }
   // We are in the jni frame unless saved_frame is true in which case
   // we are in one frame deeper (the "inner" frame). If we are in the
   // "inner" frames the args are in the Iregs and if the jni frame then
   // they are in the Oregs.
   // If we ever need to go to the VM (for locking, jvmti) then
   // we will always be in the "inner" frame.
   // Lock a synchronized method
   int lock_offset = -1;         // Set if locked
   if (method->is_synchronized()) {
     Register Roop = O1;
     const Register L3_box = L3;
     create_inner_frame(masm, &inner_frame_created);
     __ ld_ptr(I1, 0, O1);
     Label done;
     lock_offset = (lock_slot_offset * VMRegImpl::stack_slot_size);
     __ add(FP, lock_offset+STACK_BIAS, L3_box);
 #ifdef ASSERT
     if (UseBiasedLocking) {
       // making the box point to itself will make it clear it went unused
       // but also be obviously invalid
       __ st_ptr(L3_box, L3_box, 0);
     }
 #endif // ASSERT
     //
     // Compiler_lock_object (Roop, Rmark, Rbox, Rscratch) -- kills Rmark, Rbox, Rscratch
     //
     __ compiler_lock_object(Roop, L1,    L3_box, L2);
     __ br(Assembler::equal, false, Assembler::pt, done);
     __ delayed() -> add(FP, lock_offset+STACK_BIAS, L3_box);
     // None of the above fast optimizations worked so we have to get into the
     // slow case of monitor enter.  Inline a special case of call_VM that
     // disallows any pending_exception.
     __ mov(Roop, O0);            // Need oop in O0
     __ mov(L3_box, O1);
     // Record last_Java_sp, in case the VM code releases the JVM lock.
     __ set_last_Java_frame(FP, I7);
     // do the call
     __ call(CAST_FROM_FN_PTR(address, SharedRuntime::complete_monitor_locking_C), relocInfo::runtime_call_type);
     __ delayed()->mov(L7_thread_cache, O2);
     __ restore_thread(L7_thread_cache); // restore G2_thread
     __ reset_last_Java_frame();
 #ifdef ASSERT
     { Label L;
     __ ld_ptr(G2_thread, in_bytes(Thread::pending_exception_offset()), O0);
     __ br_null_short(O0, Assembler::pt, L);
     __ stop("no pending exception allowed on exit from IR::monitorenter");
     __ bind(L);
     }
 #endif
     __ bind(done);
   }
   // Finally just about ready to make the JNI call
   __ flush_windows();
   if (inner_frame_created) {
     __ restore();
   } else {
     // Store only what we need from this frame
     // QQQ I think that non-v9 (like we care) we don't need these saves
     // either as the flush traps and the current window goes too.
     __ st_ptr(FP, SP, FP->sp_offset_in_saved_window()*wordSize + STACK_BIAS);
     __ st_ptr(I7, SP, I7->sp_offset_in_saved_window()*wordSize + STACK_BIAS);
   }
   // get JNIEnv* which is first argument to native
   if (!is_critical_native) {
     __ add(G2_thread, in_bytes(JavaThread::jni_environment_offset()), O0);
   }
   // Use that pc we placed in O7 a while back as the current frame anchor
   __ set_last_Java_frame(SP, O7);
   // We flushed the windows ages ago now mark them as flushed before transitioning.
   __ set(JavaFrameAnchor::flushed, G3_scratch);
   __ st(G3_scratch, G2_thread, JavaThread::frame_anchor_offset() + JavaFrameAnchor::flags_offset());
   // Transition from _thread_in_Java to _thread_in_native.
   __ set(_thread_in_native, G3_scratch);
 #ifdef _LP64
   AddressLiteral dest(native_func);
   __ relocate(relocInfo::runtime_call_type);
   __ jumpl_to(dest, O7, O7);
 #else
   __ call(native_func, relocInfo::runtime_call_type);
 #endif
   __ delayed()->st(G3_scratch, G2_thread, JavaThread::thread_state_offset());
   __ restore_thread(L7_thread_cache); // restore G2_thread
   // Unpack native results.  For int-types, we do any needed sign-extension
   // and move things into I0.  The return value there will survive any VM
   // calls for blocking or unlocking.  An FP or OOP result (handle) is done
   // specially in the slow-path code.
   switch (ret_type) {
   case T_VOID:    break;        // Nothing to do!
   case T_FLOAT:   break;        // Got it where we want it (unless slow-path)
   case T_DOUBLE:  break;        // Got it where we want it (unless slow-path)
   // In 64 bits build result is in O0, in O0, O1 in 32bit build
   case T_LONG:
 #ifndef _LP64
                   __ mov(O1, I1);
 #endif
                   // Fall thru
   case T_OBJECT:                // Really a handle
   case T_ARRAY:
   case T_INT:
                   __ mov(O0, I0);
                   break;
   case T_BOOLEAN: __ subcc(G0, O0, G0); __ addc(G0, 0, I0); break; // !0 => true; 0 => false
   case T_BYTE   : __ sll(O0, 24, O0); __ sra(O0, 24, I0);   break;
   case T_CHAR   : __ sll(O0, 16, O0); __ srl(O0, 16, I0);   break; // cannot use and3, 0xFFFF too big as immediate value!
   case T_SHORT  : __ sll(O0, 16, O0); __ sra(O0, 16, I0);   break;
     break;                      // Cannot de-handlize until after reclaiming jvm_lock
   default:
     ShouldNotReachHere();
   }
   Label after_transition;
   // must we block?
   // Block, if necessary, before resuming in _thread_in_Java state.
   // In order for GC to work, don't clear the last_Java_sp until after blocking.
   { Label no_block;
     AddressLiteral sync_state(SafepointSynchronize::address_of_state());
     // Switch thread to "native transition" state before reading the synchronization state.
     // This additional state is necessary because reading and testing the synchronization
     // state is not atomic w.r.t. GC, as this scenario demonstrates:
     //     Java thread A, in _thread_in_native state, loads _not_synchronized and is preempted.
     //     VM thread changes sync state to synchronizing and suspends threads for GC.
     //     Thread A is resumed to finish this native method, but doesn't block here since it
     //     didn't see any synchronization is progress, and escapes.
     __ set(_thread_in_native_trans, G3_scratch);
     __ st(G3_scratch, G2_thread, JavaThread::thread_state_offset());
     if(os::is_MP()) {
       if (UseMembar) {
         // Force this write out before the read below
         __ membar(Assembler::StoreLoad);
       } else {
         // 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(G2_thread, G1_scratch, G3_scratch);
       }
     }
     __ load_contents(sync_state, G3_scratch);
     __ cmp(G3_scratch, SafepointSynchronize::_not_synchronized);
     Label L;
     Address suspend_state(G2_thread, JavaThread::suspend_flags_offset());
     __ br(Assembler::notEqual, false, Assembler::pn, L);
     __ delayed()->ld(suspend_state, G3_scratch);
     __ cmp_and_br_short(G3_scratch, 0, Assembler::equal, Assembler::pt, no_block);
     __ bind(L);
     // Block.  Save any potential method result value before the operation and
     // use a leaf call to leave the last_Java_frame setup undisturbed. Doing this
     // lets us share the oopMap we used when we went native rather the create
     // a distinct one for this pc
     //
     save_native_result(masm, ret_type, stack_slots);
     if (!is_critical_native) {
       __ call_VM_leaf(L7_thread_cache,
                       CAST_FROM_FN_PTR(address, JavaThread::check_special_condition_for_native_trans),
                       G2_thread);
     } else {
       __ call_VM_leaf(L7_thread_cache,
                       CAST_FROM_FN_PTR(address, JavaThread::check_special_condition_for_native_trans_and_transition),
                       G2_thread);
     }
     // Restore any method result value
     restore_native_result(masm, ret_type, stack_slots);
     if (is_critical_native) {
       // The call above performed the transition to thread_in_Java so
       // skip the transition logic below.
       __ ba(after_transition);
       __ delayed()->nop();
     }
     __ bind(no_block);
   }
   // thread state is thread_in_native_trans. Any safepoint blocking has already
   // happened so we can now change state to _thread_in_Java.
   __ set(_thread_in_Java, G3_scratch);
   __ st(G3_scratch, G2_thread, JavaThread::thread_state_offset());
   __ bind(after_transition);
   Label no_reguard;
   __ ld(G2_thread, JavaThread::stack_guard_state_offset(), G3_scratch);
   __ cmp_and_br_short(G3_scratch, JavaThread::stack_guard_yellow_disabled, Assembler::notEqual, Assembler::pt, no_reguard);
     save_native_result(masm, ret_type, stack_slots);
   __ call(CAST_FROM_FN_PTR(address, SharedRuntime::reguard_yellow_pages));
   __ delayed()->nop();
   __ restore_thread(L7_thread_cache); // restore G2_thread
     restore_native_result(masm, ret_type, stack_slots);
   __ bind(no_reguard);
   // Handle possible exception (will unlock if necessary)
   // native result if any is live in freg or I0 (and I1 if long and 32bit vm)
   // Unlock
   if (method->is_synchronized()) {
     Label done;
     Register I2_ex_oop = I2;
     const Register L3_box = L3;
     // Get locked oop from the handle we passed to jni
     __ ld_ptr(L6_handle, 0, L4);
     __ add(SP, lock_offset+STACK_BIAS, L3_box);
     // Must save pending exception around the slow-path VM call.  Since it's a
     // leaf call, the pending exception (if any) can be kept in a register.
     __ ld_ptr(G2_thread, in_bytes(Thread::pending_exception_offset()), I2_ex_oop);
     // Now unlock
     //                       (Roop, Rmark, Rbox,   Rscratch)
     __ compiler_unlock_object(L4,   L1,    L3_box, L2);
     __ br(Assembler::equal, false, Assembler::pt, done);
     __ delayed()-> add(SP, lock_offset+STACK_BIAS, L3_box);
     // save and restore any potential method result value around the unlocking
     // operation.  Will save in I0 (or stack for FP returns).
     save_native_result(masm, ret_type, stack_slots);
     // Must clear pending-exception before re-entering the VM.  Since this is
     // a leaf call, pending-exception-oop can be safely kept in a register.
     __ st_ptr(G0, G2_thread, in_bytes(Thread::pending_exception_offset()));
     // slow case of monitor enter.  Inline a special case of call_VM that
     // disallows any pending_exception.
     __ mov(L3_box, O1);
     __ call(CAST_FROM_FN_PTR(address, SharedRuntime::complete_monitor_unlocking_C), relocInfo::runtime_call_type);
     __ delayed()->mov(L4, O0);              // Need oop in O0
     __ restore_thread(L7_thread_cache); // restore G2_thread
 #ifdef ASSERT
     { Label L;
     __ ld_ptr(G2_thread, in_bytes(Thread::pending_exception_offset()), O0);
     __ br_null_short(O0, Assembler::pt, L);
     __ stop("no pending exception allowed on exit from IR::monitorexit");
     __ bind(L);
     }
 #endif
     restore_native_result(masm, ret_type, stack_slots);
     // check_forward_pending_exception jump to forward_exception if any pending
     // exception is set.  The forward_exception routine expects to see the
     // exception in pending_exception and not in a register.  Kind of clumsy,
     // since all folks who branch to forward_exception must have tested
     // pending_exception first and hence have it in a register already.
     __ st_ptr(I2_ex_oop, G2_thread, in_bytes(Thread::pending_exception_offset()));
     __ bind(done);
   }
   // Tell dtrace about this method exit
   {
     SkipIfEqual skip_if(
       masm, G3_scratch, &DTraceMethodProbes, Assembler::zero);
     save_native_result(masm, ret_type, stack_slots);
     __ set_metadata_constant(method(), O1);
     __ call_VM_leaf(L7_thread_cache,
        CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit),
        G2_thread, O1);
     restore_native_result(masm, ret_type, stack_slots);
   }
   // Clear "last Java frame" SP and PC.
   __ verify_thread(); // G2_thread must be correct
   __ reset_last_Java_frame();
   // Unpack oop result
   if (ret_type == T_OBJECT || ret_type == T_ARRAY) {
       Label L;
       __ addcc(G0, I0, G0);
       __ brx(Assembler::notZero, true, Assembler::pt, L);
       __ delayed()->ld_ptr(I0, 0, I0);
       __ mov(G0, I0);
       __ bind(L);
       __ verify_oop(I0);
   }
   if (!is_critical_native) {
     // reset handle block
     __ ld_ptr(G2_thread, in_bytes(JavaThread::active_handles_offset()), L5);
     __ st_ptr(G0, L5, JNIHandleBlock::top_offset_in_bytes());
     __ ld_ptr(G2_thread, in_bytes(Thread::pending_exception_offset()), G3_scratch);
     check_forward_pending_exception(masm, G3_scratch);
   }
   // Return
 #ifndef _LP64
   if (ret_type == T_LONG) {
     // Must leave proper result in O0,O1 and G1 (c2/tiered only)
     __ sllx(I0, 32, G1);          // Shift bits into high G1
     __ srl (I1, 0, I1);           // Zero extend O1 (harmless?)
     __ or3 (I1, G1, G1);          // OR 64 bits into G1
   }
 #endif
   __ ret();
   __ delayed()->restore();
   __ flush();
   nmethod *nm = nmethod::new_native_nmethod(method,
                                             compile_id,
                                             masm->code(),
                                             vep_offset,
                                             frame_complete,
                                             stack_slots / VMRegImpl::slots_per_word,
                                             (is_static ? in_ByteSize(klass_offset) : in_ByteSize(receiver_offset)),
                                             in_ByteSize(lock_offset),
                                             oop_maps);
   if (is_critical_native) {
     nm->set_lazy_critical_native(true);
   }
   return nm;
 }
 #ifdef HAVE_DTRACE_H
 // ---------------------------------------------------------------------------
 // Generate a dtrace nmethod for a given signature.  The method takes arguments
 // in the Java compiled code convention, marshals them to the native
 // abi and then leaves nops at the position you would expect to call a native
 // function. When the probe is enabled the nops are replaced with a trap
 // instruction that dtrace inserts and the trace will cause a notification
 // to dtrace.
 //
 // The probes are only able to take primitive types and java/lang/String as
 // arguments.  No other java types are allowed. Strings are converted to utf8
 // strings so that from dtrace point of view java strings are converted to C
 // strings. There is an arbitrary fixed limit on the total space that a method
 // can use for converting the strings. (256 chars per string in the signature).
 // So any java string larger then this is truncated.
 static int  fp_offset[ConcreteRegisterImpl::number_of_registers] = { 0 };
 static bool offsets_initialized = false;
 nmethod *SharedRuntime::generate_dtrace_nmethod(
     MacroAssembler *masm, methodHandle method) {
   // generate_dtrace_nmethod is guarded by a mutex so we are sure to
   // be single threaded in this method.
   assert(AdapterHandlerLibrary_lock->owned_by_self(), "must be");
   // Fill in the signature array, for the calling-convention call.
   int total_args_passed = method->size_of_parameters();
   BasicType* in_sig_bt  = NEW_RESOURCE_ARRAY(BasicType, total_args_passed);
   VMRegPair  *in_regs   = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed);
   // The signature we are going to use for the trap that dtrace will see
   // java/lang/String is converted. We drop "this" and any other object
   // is converted to NULL.  (A one-slot java/lang/Long object reference
   // is converted to a two-slot long, which is why we double the allocation).
   BasicType* out_sig_bt = NEW_RESOURCE_ARRAY(BasicType, total_args_passed * 2);
   VMRegPair* out_regs   = NEW_RESOURCE_ARRAY(VMRegPair, total_args_passed * 2);
   int i=0;
   int total_strings = 0;
   int first_arg_to_pass = 0;
   int total_c_args = 0;
   // Skip the receiver as dtrace doesn't want to see it
   if( !method->is_static() ) {
     in_sig_bt[i++] = T_OBJECT;
     first_arg_to_pass = 1;
   }
   SignatureStream ss(method->signature());
   for ( ; !ss.at_return_type(); ss.next()) {
     BasicType bt = ss.type();
     in_sig_bt[i++] = bt;  // Collect remaining bits of signature
     out_sig_bt[total_c_args++] = bt;
     if( bt == T_OBJECT) {
       Symbol* s = ss.as_symbol_or_null();
       if (s == vmSymbols::java_lang_String()) {
         total_strings++;
         out_sig_bt[total_c_args-1] = T_ADDRESS;
       } else if (s == vmSymbols::java_lang_Boolean() ||
                  s == vmSymbols::java_lang_Byte()) {
         out_sig_bt[total_c_args-1] = T_BYTE;
       } else if (s == vmSymbols::java_lang_Character() ||
                  s == vmSymbols::java_lang_Short()) {
         out_sig_bt[total_c_args-1] = T_SHORT;
       } else if (s == vmSymbols::java_lang_Integer() ||
                  s == vmSymbols::java_lang_Float()) {
         out_sig_bt[total_c_args-1] = T_INT;
       } else if (s == vmSymbols::java_lang_Long() ||
                  s == vmSymbols::java_lang_Double()) {
         out_sig_bt[total_c_args-1] = T_LONG;
         out_sig_bt[total_c_args++] = T_VOID;
       }
     } else if ( bt == T_LONG || bt == T_DOUBLE ) {
       in_sig_bt[i++] = T_VOID;   // Longs & doubles take 2 Java slots
       // We convert double to long
       out_sig_bt[total_c_args-1] = T_LONG;
       out_sig_bt[total_c_args++] = T_VOID;
     } else if ( bt == T_FLOAT) {
       // We convert float to int
       out_sig_bt[total_c_args-1] = T_INT;
     }
   }
   assert(i==total_args_passed, "validly parsed signature");
   // Now get the compiled-Java layout as input arguments
   int comp_args_on_stack;
   comp_args_on_stack = SharedRuntime::java_calling_convention(
       in_sig_bt, in_regs, total_args_passed, false);
   // We have received a description of where all the java arg are located
   // on entry to the wrapper. We need to convert these args to where
   // the a  native (non-jni) function would expect them. To figure out
   // where they go we convert the java signature to a C signature and remove
   // T_VOID for any long/double we might have received.
   // Now figure out where the args must be stored and how much stack space
   // they require (neglecting out_preserve_stack_slots but space for storing
   // the 1st six register arguments). It's weird see int_stk_helper.
   //
   int out_arg_slots;
   out_arg_slots = c_calling_convention(out_sig_bt, out_regs, total_c_args);
   // Calculate the total number of stack slots we will need.
   // First count the abi requirement plus all of the outgoing args
   int stack_slots = SharedRuntime::out_preserve_stack_slots() + out_arg_slots;
   // Plus a temp for possible converion of float/double/long register args
   int conversion_temp = stack_slots;
   stack_slots += 2;
   // Now space for the string(s) we must convert
   int string_locs = stack_slots;
   stack_slots += total_strings *
                    (max_dtrace_string_size / VMRegImpl::stack_slot_size);
   // Ok The space we have allocated will look like:
   //
   //
   // FP-> |                     |
   //      |---------------------|
   //      | string[n]           |
   //      |---------------------| <- string_locs[n]
   //      | string[n-1]         |
   //      |---------------------| <- string_locs[n-1]
   //      | ...                 |
   //      | ...                 |
   //      |---------------------| <- string_locs[1]
   //      | string[0]           |
   //      |---------------------| <- string_locs[0]
   //      | temp                |
   //      |---------------------| <- conversion_temp
   //      | outbound memory     |
   //      | based arguments     |
   //      |                     |
   //      |---------------------|
   //      |                     |
   // SP-> | out_preserved_slots |
   //
   //
   // Now compute actual number of stack words we need rounding to make
   // stack properly aligned.
   stack_slots = round_to(stack_slots, 4 * VMRegImpl::slots_per_word);
   int stack_size = stack_slots * VMRegImpl::stack_slot_size;
   intptr_t start = (intptr_t)__ pc();
   // First thing make an ic check to see if we should even be here
   {
     Label L;
     const Register temp_reg = G3_scratch;
     AddressLiteral ic_miss(SharedRuntime::get_ic_miss_stub());
     __ verify_oop(O0);
     __ ld_ptr(O0, oopDesc::klass_offset_in_bytes(), temp_reg);
     __ cmp_and_brx_short(temp_reg, G5_inline_cache_reg, Assembler::equal, Assembler::pt, L);
     __ jump_to(ic_miss, temp_reg);
     __ delayed()->nop();
     __ align(CodeEntryAlignment);
     __ bind(L);
   }
   int vep_offset = ((intptr_t)__ pc()) - start;
   // The instruction at the verified entry point must be 5 bytes or longer
   // because it can be patched on the fly by make_non_entrant. The stack bang
   // instruction fits that requirement.
   // Generate stack overflow check before creating frame
   __ generate_stack_overflow_check(stack_size);
   assert(((intptr_t)__ pc() - start - vep_offset) >= 5,
          "valid size for make_non_entrant");
   // Generate a new frame for the wrapper.
   __ save(SP, -stack_size, SP);
   // Frame is now completed as far a size and linkage.
   int frame_complete = ((intptr_t)__ pc()) - start;
 #ifdef ASSERT
   bool reg_destroyed[RegisterImpl::number_of_registers];
   bool freg_destroyed[FloatRegisterImpl::number_of_registers];
   for ( int r = 0 ; r < RegisterImpl::number_of_registers ; r++ ) {
     reg_destroyed[r] = false;
   }
   for ( int f = 0 ; f < FloatRegisterImpl::number_of_registers ; f++ ) {
     freg_destroyed[f] = false;
   }
 #endif /* ASSERT */
   VMRegPair zero;
   const Register g0 = G0; // without this we get a compiler warning (why??)
   zero.set2(g0->as_VMReg());
   int c_arg, j_arg;
   Register conversion_off = noreg;
   for (j_arg = first_arg_to_pass, c_arg = 0 ;
        j_arg < total_args_passed ; j_arg++, c_arg++ ) {
     VMRegPair src = in_regs[j_arg];
     VMRegPair dst = out_regs[c_arg];
 #ifdef ASSERT
     if (src.first()->is_Register()) {
       assert(!reg_destroyed[src.first()->as_Register()->encoding()], "ack!");
     } else if (src.first()->is_FloatRegister()) {
       assert(!freg_destroyed[src.first()->as_FloatRegister()->encoding(
                                                FloatRegisterImpl::S)], "ack!");
     }
     if (dst.first()->is_Register()) {
       reg_destroyed[dst.first()->as_Register()->encoding()] = true;
     } else if (dst.first()->is_FloatRegister()) {
       freg_destroyed[dst.first()->as_FloatRegister()->encoding(
                                                  FloatRegisterImpl::S)] = true;
     }
 #endif /* ASSERT */
     switch (in_sig_bt[j_arg]) {
       case T_ARRAY:
       case T_OBJECT:
         {
           if (out_sig_bt[c_arg] == T_BYTE  || out_sig_bt[c_arg] == T_SHORT ||
               out_sig_bt[c_arg] == T_INT || out_sig_bt[c_arg] == T_LONG) {
             // need to unbox a one-slot value
             Register in_reg = L0;
             Register tmp = L2;
             if ( src.first()->is_reg() ) {
               in_reg = src.first()->as_Register();
             } else {
               assert(Assembler::is_simm13(reg2offset(src.first()) + STACK_BIAS),
                      "must be");
               __ ld_ptr(FP, reg2offset(src.first()) + STACK_BIAS, in_reg);
             }
             // If the final destination is an acceptable register
             if ( dst.first()->is_reg() ) {
               if ( dst.is_single_phys_reg() || out_sig_bt[c_arg] != T_LONG ) {
                 tmp = dst.first()->as_Register();
               }
             }
             Label skipUnbox;
             if ( wordSize == 4 && out_sig_bt[c_arg] == T_LONG ) {
               __ mov(G0, tmp->successor());
             }
             __ br_null(in_reg, true, Assembler::pn, skipUnbox);
             __ delayed()->mov(G0, tmp);
             BasicType bt = out_sig_bt[c_arg];
             int box_offset = java_lang_boxing_object::value_offset_in_bytes(bt);
             switch (bt) {
                 case T_BYTE:
                   __ ldub(in_reg, box_offset, tmp); break;
                 case T_SHORT:
                   __ lduh(in_reg, box_offset, tmp); break;
                 case T_INT:
                   __ ld(in_reg, box_offset, tmp); break;
                 case T_LONG:
                   __ ld_long(in_reg, box_offset, tmp); break;
                 default: ShouldNotReachHere();
             }
             __ bind(skipUnbox);
             // If tmp wasn't final destination copy to final destination
             if (tmp == L2) {
               VMRegPair tmp_as_VM = reg64_to_VMRegPair(L2);
               if (out_sig_bt[c_arg] == T_LONG) {
                 long_move(masm, tmp_as_VM, dst);
               } else {
                 move32_64(masm, tmp_as_VM, out_regs[c_arg]);
               }
             }
             if (out_sig_bt[c_arg] == T_LONG) {
               assert(out_sig_bt[c_arg+1] == T_VOID, "must be");
               ++c_arg; // move over the T_VOID to keep the loop indices in sync
             }
           } else if (out_sig_bt[c_arg] == T_ADDRESS) {
             Register s =
                 src.first()->is_reg() ? src.first()->as_Register() : L2;
             Register d =
                 dst.first()->is_reg() ? dst.first()->as_Register() : L2;
             // We store the oop now so that the conversion pass can reach
             // while in the inner frame. This will be the only store if
             // the oop is NULL.
             if (s != L2) {
               // src is register
               if (d != L2) {
                 // dst is register
                 __ mov(s, d);
               } else {
                 assert(Assembler::is_simm13(reg2offset(dst.first()) +
                           STACK_BIAS), "must be");
                 __ st_ptr(s, SP, reg2offset(dst.first()) + STACK_BIAS);
               }
             } else {
                 // src not a register
                 assert(Assembler::is_simm13(reg2offset(src.first()) +
                            STACK_BIAS), "must be");
                 __ ld_ptr(FP, reg2offset(src.first()) + STACK_BIAS, d);
                 if (d == L2) {
                   assert(Assembler::is_simm13(reg2offset(dst.first()) +
                              STACK_BIAS), "must be");
                   __ st_ptr(d, SP, reg2offset(dst.first()) + STACK_BIAS);
                 }
             }
           } else if (out_sig_bt[c_arg] != T_VOID) {
             // Convert the arg to NULL
             if (dst.first()->is_reg()) {
               __ mov(G0, dst.first()->as_Register());
             } else {
               assert(Assembler::is_simm13(reg2offset(dst.first()) +
                          STACK_BIAS), "must be");
               __ st_ptr(G0, SP, reg2offset(dst.first()) + STACK_BIAS);
             }
           }
         }
         break;
       case T_VOID:
         break;
       case T_FLOAT:
         if (src.first()->is_stack()) {
           // Stack to stack/reg is simple
           move32_64(masm, src, dst);
         } else {
           if (dst.first()->is_reg()) {
             // freg -> reg
             int off =
               STACK_BIAS + conversion_temp * VMRegImpl::stack_slot_size;
             Register d = dst.first()->as_Register();
             if (Assembler::is_simm13(off)) {
               __ stf(FloatRegisterImpl::S, src.first()->as_FloatRegister(),
                      SP, off);
               __ ld(SP, off, d);
             } else {
               if (conversion_off == noreg) {
                 __ set(off, L6);
                 conversion_off = L6;
               }
               __ stf(FloatRegisterImpl::S, src.first()->as_FloatRegister(),
                      SP, conversion_off);
               __ ld(SP, conversion_off , d);
             }
           } else {
             // freg -> mem
             int off = STACK_BIAS + reg2offset(dst.first());
             if (Assembler::is_simm13(off)) {
               __ stf(FloatRegisterImpl::S, src.first()->as_FloatRegister(),
                      SP, off);
             } else {
               if (conversion_off == noreg) {
                 __ set(off, L6);
                 conversion_off = L6;
               }
               __ stf(FloatRegisterImpl::S, src.first()->as_FloatRegister(),
                      SP, conversion_off);
             }
           }
         }
         break;
       case T_DOUBLE:
         assert( j_arg + 1 < total_args_passed &&
                 in_sig_bt[j_arg + 1] == T_VOID &&
                 out_sig_bt[c_arg+1] == T_VOID, "bad arg list");
         if (src.first()->is_stack()) {
           // Stack to stack/reg is simple
           long_move(masm, src, dst);
         } else {
           Register d = dst.first()->is_reg() ? dst.first()->as_Register() : L2;
           // Destination could be an odd reg on 32bit in which case
           // we can't load direct to the destination.
           if (!d->is_even() && wordSize == 4) {
             d = L2;
           }
           int off = STACK_BIAS + conversion_temp * VMRegImpl::stack_slot_size;
           if (Assembler::is_simm13(off)) {
             __ stf(FloatRegisterImpl::D, src.first()->as_FloatRegister(),
                    SP, off);
             __ ld_long(SP, off, d);
           } else {
             if (conversion_off == noreg) {
               __ set(off, L6);
               conversion_off = L6;
             }
             __ stf(FloatRegisterImpl::D, src.first()->as_FloatRegister(),
                    SP, conversion_off);
             __ ld_long(SP, conversion_off, d);
           }
           if (d == L2) {
             long_move(masm, reg64_to_VMRegPair(L2), dst);
           }
         }
         break;
       case T_LONG :
         // 32bit can't do a split move of something like g1 -> O0, O1
         // so use a memory temp
         if (src.is_single_phys_reg() && wordSize == 4) {
           Register tmp = L2;
           if (dst.first()->is_reg() &&
               (wordSize == 8 || dst.first()->as_Register()->is_even())) {
             tmp = dst.first()->as_Register();
           }
           int off = STACK_BIAS + conversion_temp * VMRegImpl::stack_slot_size;
           if (Assembler::is_simm13(off)) {
             __ stx(src.first()->as_Register(), SP, off);
             __ ld_long(SP, off, tmp);
           } else {
             if (conversion_off == noreg) {
               __ set(off, L6);
               conversion_off = L6;
             }
             __ stx(src.first()->as_Register(), SP, conversion_off);
             __ ld_long(SP, conversion_off, tmp);
           }
           if (tmp == L2) {
             long_move(masm, reg64_to_VMRegPair(L2), dst);
           }
         } else {
           long_move(masm, src, dst);
         }
         break;
       case T_ADDRESS: assert(false, "found T_ADDRESS in java args");
       default:
         move32_64(masm, src, dst);
     }
   }
   // If we have any strings we must store any register based arg to the stack
   // This includes any still live xmm registers too.
   if (total_strings > 0 ) {
     // protect all the arg registers
     __ save_frame(0);
     __ mov(G2_thread, L7_thread_cache);
     const Register L2_string_off = L2;
     // Get first string offset
     __ set(string_locs * VMRegImpl::stack_slot_size, L2_string_off);
     for (c_arg = 0 ; c_arg < total_c_args ; c_arg++ ) {
       if (out_sig_bt[c_arg] == T_ADDRESS) {
         VMRegPair dst = out_regs[c_arg];
         const Register d = dst.first()->is_reg() ?
             dst.first()->as_Register()->after_save() : noreg;
         // It's a string the oop and it was already copied to the out arg
         // position
         if (d != noreg) {
           __ mov(d, O0);
         } else {
           assert(Assembler::is_simm13(reg2offset(dst.first()) + STACK_BIAS),
                  "must be");
           __ ld_ptr(FP,  reg2offset(dst.first()) + STACK_BIAS, O0);
         }
         Label skip;
         __ br_null(O0, false, Assembler::pn, skip);
         __ delayed()->add(FP, L2_string_off, O1);
         if (d != noreg) {
           __ mov(O1, d);
         } else {
           assert(Assembler::is_simm13(reg2offset(dst.first()) + STACK_BIAS),
                  "must be");
           __ st_ptr(O1, FP,  reg2offset(dst.first()) + STACK_BIAS);
         }
         __ call(CAST_FROM_FN_PTR(address, SharedRuntime::get_utf),
                 relocInfo::runtime_call_type);
         __ delayed()->add(L2_string_off, max_dtrace_string_size, L2_string_off);
         __ bind(skip);
       }
     }
     __ mov(L7_thread_cache, G2_thread);
     __ restore();
   }
   // Ok now we are done. Need to place the nop that dtrace wants in order to
   // patch in the trap
   int patch_offset = ((intptr_t)__ pc()) - start;
   __ nop();
   // Return
   __ ret();
   __ delayed()->restore();
   __ flush();
   nmethod *nm = nmethod::new_dtrace_nmethod(
       method, masm->code(), vep_offset, patch_offset, frame_complete,
       stack_slots / VMRegImpl::slots_per_word);
   return nm;
 }
 #endif // HAVE_DTRACE_H
 // this function returns the adjust size (in number of words) to a c2i adapter
 // activation for use during deoptimization
 int Deoptimization::last_frame_adjust(int callee_parameters, int callee_locals) {
   assert(callee_locals >= callee_parameters,
           "test and remove; got more parms than locals");
   if (callee_locals < callee_parameters)
     return 0;                   // No adjustment for negative locals
   int diff = (callee_locals - callee_parameters) * Interpreter::stackElementWords;
   return round_to(diff, WordsPerLong);
 }
 // "Top of Stack" slots that may be unused by the calling convention but must
 // otherwise be preserved.
 // On Intel these are not necessary and the value can be zero.
 // On Sparc this describes the words reserved for storing a register window
 // when an interrupt occurs.
 uint SharedRuntime::out_preserve_stack_slots() {
   return frame::register_save_words * VMRegImpl::slots_per_word;
 }
 static void gen_new_frame(MacroAssembler* masm, bool deopt) {
 //
 // Common out the new frame generation for deopt and uncommon trap
 //
   Register        G3pcs              = G3_scratch; // Array of new pcs (input)
   Register        Oreturn0           = O0;
   Register        Oreturn1           = O1;
   Register        O2UnrollBlock      = O2;
   Register        O3array            = O3;         // Array of frame sizes (input)
   Register        O4array_size       = O4;         // number of frames (input)
   Register        O7frame_size       = O7;         // number of frames (input)
   __ ld_ptr(O3array, 0, O7frame_size);
   __ sub(G0, O7frame_size, O7frame_size);
   __ save(SP, O7frame_size, SP);
   __ ld_ptr(G3pcs, 0, I7);                      // load frame's new pc
   #ifdef ASSERT
   // make sure that the frames are aligned properly
 #ifndef _LP64
   __ btst(wordSize*2-1, SP);
   __ breakpoint_trap(Assembler::notZero, Assembler::ptr_cc);
 #endif
   #endif
   // Deopt needs to pass some extra live values from frame to frame
   if (deopt) {
     __ mov(Oreturn0->after_save(), Oreturn0);
     __ mov(Oreturn1->after_save(), Oreturn1);
   }
   __ mov(O4array_size->after_save(), O4array_size);
   __ sub(O4array_size, 1, O4array_size);
   __ mov(O3array->after_save(), O3array);
   __ mov(O2UnrollBlock->after_save(), O2UnrollBlock);
   __ add(G3pcs, wordSize, G3pcs);               // point to next pc value
   #ifdef ASSERT
   // trash registers to show a clear pattern in backtraces
   __ set(0xDEAD0000, I0);
   __ add(I0,  2, I1);
   __ add(I0,  4, I2);
   __ add(I0,  6, I3);
   __ add(I0,  8, I4);
   // Don't touch I5 could have valuable savedSP
   __ set(0xDEADBEEF, L0);
   __ mov(L0, L1);
   __ mov(L0, L2);
   __ mov(L0, L3);
   __ mov(L0, L4);
   __ mov(L0, L5);
   // trash the return value as there is nothing to return yet
   __ set(0xDEAD0001, O7);
   #endif
   __ mov(SP, O5_savedSP);
 }
 static void make_new_frames(MacroAssembler* masm, bool deopt) {
   //
   // loop through the UnrollBlock info and create new frames
   //
   Register        G3pcs              = G3_scratch;
   Register        Oreturn0           = O0;
   Register        Oreturn1           = O1;
   Register        O2UnrollBlock      = O2;
   Register        O3array            = O3;
   Register        O4array_size       = O4;
   Label           loop;
   // Before we make new frames, check to see if stack is available.
   // Do this after the caller's return address is on top of stack
   if (UseStackBanging) {
     // Get total frame size for interpreted frames
     __ ld(O2UnrollBlock, Deoptimization::UnrollBlock::total_frame_sizes_offset_in_bytes(), O4);
     __ bang_stack_size(O4, O3, G3_scratch);
   }
   __ ld(O2UnrollBlock, Deoptimization::UnrollBlock::number_of_frames_offset_in_bytes(), O4array_size);
   __ ld_ptr(O2UnrollBlock, Deoptimization::UnrollBlock::frame_pcs_offset_in_bytes(), G3pcs);
   __ ld_ptr(O2UnrollBlock, Deoptimization::UnrollBlock::frame_sizes_offset_in_bytes(), O3array);
   // Adjust old interpreter frame to make space for new frame's extra java locals
   //
   // We capture the original sp for the transition frame only because it is needed in
   // order to properly calculate interpreter_sp_adjustment. Even though in real life
   // every interpreter frame captures a savedSP it is only needed at the transition
   // (fortunately). If we had to have it correct everywhere then we would need to
   // be told the sp_adjustment for each frame we create. If the frame size array
   // were to have twice the frame count entries then we could have pairs [sp_adjustment, frame_size]
   // for each frame we create and keep up the illusion every where.
   //
   __ ld(O2UnrollBlock, Deoptimization::UnrollBlock::caller_adjustment_offset_in_bytes(), O7);
   __ mov(SP, O5_savedSP);       // remember initial sender's original sp before adjustment
   __ sub(SP, O7, SP);
 #ifdef ASSERT
   // make sure that there is at least one entry in the array
   __ tst(O4array_size);
   __ breakpoint_trap(Assembler::zero, Assembler::icc);
 #endif
   // Now push the new interpreter frames
   __ bind(loop);
   // allocate a new frame, filling the registers
   gen_new_frame(masm, deopt);        // allocate an interpreter frame
   __ cmp_zero_and_br(Assembler::notZero, O4array_size, loop);
   __ delayed()->add(O3array, wordSize, O3array);
   __ ld_ptr(G3pcs, 0, O7);                      // load final frame new pc
 }
 //------------------------------generate_deopt_blob----------------------------
 // Ought to generate an ideal graph & compile, but here's some SPARC ASM
 // instead.
 void SharedRuntime::generate_deopt_blob() {
   // allocate space for the code
   ResourceMark rm;
   // setup code generation tools
   int pad = VerifyThread ? 512 : 0;// Extra slop space for more verify code
   if (UseStackBanging) {
     pad += StackShadowPages*16 + 32;
   }
 #ifdef _LP64
   CodeBuffer buffer("deopt_blob", 2100+pad, 512);
 #else
   // Measured 8/7/03 at 1212 in 32bit debug build (no VerifyThread)
   // Measured 8/7/03 at 1396 in 32bit debug build (VerifyThread)
   CodeBuffer buffer("deopt_blob", 1600+pad, 512);
 #endif /* _LP64 */
   MacroAssembler* masm               = new MacroAssembler(&buffer);
   FloatRegister   Freturn0           = F0;
   Register        Greturn1           = G1;
   Register        Oreturn0           = O0;
   Register        Oreturn1           = O1;
   Register        O2UnrollBlock      = O2;
   Register        L0deopt_mode       = L0;
   Register        G4deopt_mode       = G4_scratch;
   int             frame_size_words;
   Address         saved_Freturn0_addr(FP, -sizeof(double) + STACK_BIAS);
 #if !defined(_LP64) && defined(COMPILER2)
   Address         saved_Greturn1_addr(FP, -sizeof(double) -sizeof(jlong) + STACK_BIAS);
 #endif
   Label           cont;
   OopMapSet *oop_maps = new OopMapSet();
   //
   // This is the entry point for code which is returning to a de-optimized
   // frame.
   // The steps taken by this frame are as follows:
   //   - push a dummy "register_save" and save the return values (O0, O1, F0/F1, G1)
   //     and all potentially live registers (at a pollpoint many registers can be live).
   //
   //   - call the C routine: Deoptimization::fetch_unroll_info (this function
   //     returns information about the number and size of interpreter frames
   //     which are equivalent to the frame which is being deoptimized)
   //   - deallocate the unpack frame, restoring only results values. Other
   //     volatile registers will now be captured in the vframeArray as needed.
   //   - deallocate the deoptimization frame
   //   - in a loop using the information returned in the previous step
   //     push new interpreter frames (take care to propagate the return
   //     values through each new frame pushed)
   //   - create a dummy "unpack_frame" and save the return values (O0, O1, F0)
   //   - call the C routine: Deoptimization::unpack_frames (this function
   //     lays out values on the interpreter frame which was just created)
   //   - deallocate the dummy unpack_frame
   //   - ensure that all the return values are correctly set and then do
   //     a return to the interpreter entry point
   //
   // Refer to the following methods for more information:
   //   - Deoptimization::fetch_unroll_info
   //   - Deoptimization::unpack_frames
   OopMap* map = NULL;
   int start = __ offset();
   // restore G2, the trampoline destroyed it
   __ get_thread();
   // On entry we have been called by the deoptimized nmethod with a call that
   // replaced the original call (or safepoint polling location) so the deoptimizing
   // pc is now in O7. Return values are still in the expected places
   map = RegisterSaver::save_live_registers(masm, 0, &frame_size_words);
   __ ba(cont);
   __ delayed()->mov(Deoptimization::Unpack_deopt, L0deopt_mode);
   int exception_offset = __ offset() - start;
   // restore G2, the trampoline destroyed it
   __ get_thread();
   // On entry we have been jumped to by the exception handler (or exception_blob
   // for server).  O0 contains the exception oop and O7 contains the original
   // exception pc.  So if we push a frame here it will look to the
   // stack walking code (fetch_unroll_info) just like a normal call so
   // state will be extracted normally.
   // save exception oop in JavaThread and fall through into the
   // exception_in_tls case since they are handled in same way except
   // for where the pending exception is kept.
   __ st_ptr(Oexception, G2_thread, JavaThread::exception_oop_offset());
   //
   // Vanilla deoptimization with an exception pending in exception_oop
   //
   int exception_in_tls_offset = __ offset() - start;
   // No need to update oop_map  as each call to save_live_registers will produce identical oopmap
   (void) RegisterSaver::save_live_registers(masm, 0, &frame_size_words);
   // Restore G2_thread
   __ get_thread();
 #ifdef ASSERT
   {
     // verify that there is really an exception oop in exception_oop
     Label has_exception;
     __ ld_ptr(G2_thread, JavaThread::exception_oop_offset(), Oexception);
     __ br_notnull_short(Oexception, Assembler::pt, has_exception);
     __ stop("no exception in thread");
     __ bind(has_exception);
     // verify that there is no pending exception
     Label no_pending_exception;
     Address exception_addr(G2_thread, Thread::pending_exception_offset());
     __ ld_ptr(exception_addr, Oexception);
     __ br_null_short(Oexception, Assembler::pt, no_pending_exception);
     __ stop("must not have pending exception here");
     __ bind(no_pending_exception);
   }
 #endif
   __ ba(cont);
   __ delayed()->mov(Deoptimization::Unpack_exception, L0deopt_mode);;
   //
   // Reexecute entry, similar to c2 uncommon trap
   //
   int reexecute_offset = __ offset() - start;
   // No need to update oop_map  as each call to save_live_registers will produce identical oopmap
   (void) RegisterSaver::save_live_registers(masm, 0, &frame_size_words);
   __ mov(Deoptimization::Unpack_reexecute, L0deopt_mode);
   __ bind(cont);
   __ set_last_Java_frame(SP, noreg);
   // do the call by hand so we can get the oopmap
   __ mov(G2_thread, L7_thread_cache);
   __ call(CAST_FROM_FN_PTR(address, Deoptimization::fetch_unroll_info), relocInfo::runtime_call_type);
   __ delayed()->mov(G2_thread, O0);
   // Set an oopmap for the call site this describes all our saved volatile registers
   oop_maps->add_gc_map( __ offset()-start, map);
   __ mov(L7_thread_cache, G2_thread);
   __ reset_last_Java_frame();
   // NOTE: we know that only O0/O1 will be reloaded by restore_result_registers
   // so this move will survive
   __ mov(L0deopt_mode, G4deopt_mode);
   __ mov(O0, O2UnrollBlock->after_save());
   RegisterSaver::restore_result_registers(masm);
   Label noException;
   __ cmp_and_br_short(G4deopt_mode, Deoptimization::Unpack_exception, Assembler::notEqual, Assembler::pt, noException);
   // Move the pending exception from exception_oop to Oexception so
   // the pending exception will be picked up the interpreter.
   __ ld_ptr(G2_thread, in_bytes(JavaThread::exception_oop_offset()), Oexception);
   __ st_ptr(G0, G2_thread, in_bytes(JavaThread::exception_oop_offset()));
   __ bind(noException);
   // deallocate the deoptimization frame taking care to preserve the return values
   __ mov(Oreturn0,     Oreturn0->after_save());
   __ mov(Oreturn1,     Oreturn1->after_save());
   __ mov(O2UnrollBlock, O2UnrollBlock->after_save());
   __ restore();
   // Allocate new interpreter frame(s) and possible c2i adapter frame
   make_new_frames(masm, true);
   // push a dummy "unpack_frame" taking care of float return values and
   // call Deoptimization::unpack_frames to have the unpacker layout
   // information in the interpreter frames just created and then return
   // to the interpreter entry point
   __ save(SP, -frame_size_words*wordSize, SP);
   __ stf(FloatRegisterImpl::D, Freturn0, saved_Freturn0_addr);
 #if !defined(_LP64)
 #if defined(COMPILER2)
   // 32-bit 1-register longs return longs in G1
   __ stx(Greturn1, saved_Greturn1_addr);
 #endif
   __ set_last_Java_frame(SP, noreg);
   __ call_VM_leaf(L7_thread_cache, CAST_FROM_FN_PTR(address, Deoptimization::unpack_frames), G2_thread, G4deopt_mode);
 #else
   // LP64 uses g4 in set_last_Java_frame
   __ mov(G4deopt_mode, O1);
   __ set_last_Java_frame(SP, G0);
   __ call_VM_leaf(L7_thread_cache, CAST_FROM_FN_PTR(address, Deoptimization::unpack_frames), G2_thread, O1);
 #endif
   __ reset_last_Java_frame();
   __ ldf(FloatRegisterImpl::D, saved_Freturn0_addr, Freturn0);
 #if !defined(_LP64) && defined(COMPILER2)
   // In 32 bit, C2 returns longs in G1 so restore the saved G1 into
   // I0/I1 if the return value is long.
   Label not_long;
   __ cmp_and_br_short(O0,T_LONG, Assembler::notEqual, Assembler::pt, not_long);
   __ ldd(saved_Greturn1_addr,I0);
   __ bind(not_long);
 #endif
   __ ret();
   __ delayed()->restore();
   masm->flush();
   _deopt_blob = DeoptimizationBlob::create(&buffer, oop_maps, 0, exception_offset, reexecute_offset, frame_size_words);
   _deopt_blob->set_unpack_with_exception_in_tls_offset(exception_in_tls_offset);
 }
 #ifdef COMPILER2
 //------------------------------generate_uncommon_trap_blob--------------------
 // Ought to generate an ideal graph & compile, but here's some SPARC ASM
 // instead.
 void SharedRuntime::generate_uncommon_trap_blob() {
   // allocate space for the code
   ResourceMark rm;
   // setup code generation tools
   int pad = VerifyThread ? 512 : 0;
   if (UseStackBanging) {
     pad += StackShadowPages*16 + 32;
   }
 #ifdef _LP64
   CodeBuffer buffer("uncommon_trap_blob", 2700+pad, 512);
 #else
   // Measured 8/7/03 at 660 in 32bit debug build (no VerifyThread)
   // Measured 8/7/03 at 1028 in 32bit debug build (VerifyThread)
   CodeBuffer buffer("uncommon_trap_blob", 2000+pad, 512);
 #endif
   MacroAssembler* masm               = new MacroAssembler(&buffer);
   Register        O2UnrollBlock      = O2;
   Register        O2klass_index      = O2;
   //
   // This is the entry point for all traps the compiler takes when it thinks
   // it cannot handle further execution of compilation code. The frame is
   // deoptimized in these cases and converted into interpreter frames for
   // execution
   // The steps taken by this frame are as follows:
   //   - push a fake "unpack_frame"
   //   - call the C routine Deoptimization::uncommon_trap (this function
   //     packs the current compiled frame into vframe arrays and returns
   //     information about the number and size of interpreter frames which
   //     are equivalent to the frame which is being deoptimized)
   //   - deallocate the "unpack_frame"
   //   - deallocate the deoptimization frame
   //   - in a loop using the information returned in the previous step
   //     push interpreter frames;
   //   - create a dummy "unpack_frame"
   //   - call the C routine: Deoptimization::unpack_frames (this function
   //     lays out values on the interpreter frame which was just created)
   //   - deallocate the dummy unpack_frame
   //   - return to the interpreter entry point
   //
   //  Refer to the following methods for more information:
   //   - Deoptimization::uncommon_trap
   //   - Deoptimization::unpack_frame
   // the unloaded class index is in O0 (first parameter to this blob)
   // push a dummy "unpack_frame"
   // and call Deoptimization::uncommon_trap to pack the compiled frame into
   // vframe array and return the UnrollBlock information
   __ save_frame(0);
   __ set_last_Java_frame(SP, noreg);
   __ mov(I0, O2klass_index);
   __ call_VM_leaf(L7_thread_cache, CAST_FROM_FN_PTR(address, Deoptimization::uncommon_trap), G2_thread, O2klass_index);
   __ reset_last_Java_frame();
   __ mov(O0, O2UnrollBlock->after_save());
   __ restore();
   // deallocate the deoptimized frame taking care to preserve the return values
   __ mov(O2UnrollBlock, O2UnrollBlock->after_save());
   __ restore();
   // Allocate new interpreter frame(s) and possible c2i adapter frame
   make_new_frames(masm, false);
   // push a dummy "unpack_frame" taking care of float return values and
   // call Deoptimization::unpack_frames to have the unpacker layout
   // information in the interpreter frames just created and then return
   // to the interpreter entry point
   __ save_frame(0);
   __ set_last_Java_frame(SP, noreg);
   __ mov(Deoptimization::Unpack_uncommon_trap, O3); // indicate it is the uncommon trap case
   __ call_VM_leaf(L7_thread_cache, CAST_FROM_FN_PTR(address, Deoptimization::unpack_frames), G2_thread, O3);
   __ reset_last_Java_frame();
   __ ret();
   __ delayed()->restore();
   masm->flush();
   _uncommon_trap_blob = UncommonTrapBlob::create(&buffer, NULL, __ total_frame_size_in_bytes(0)/wordSize);
 }
 #endif // COMPILER2
 //------------------------------generate_handler_blob-------------------
 //
 // Generate a special Compile2Runtime blob that saves all registers, and sets
 // up an OopMap.
 //
 // This blob is jumped to (via a breakpoint and the signal handler) from a
 // safepoint in compiled code.  On entry to this blob, O7 contains the
 // address in the original nmethod at which we should resume normal execution.
 // Thus, this blob looks like a subroutine which must preserve lots of
 // registers and return normally.  Note that O7 is never register-allocated,
 // so it is guaranteed to be free here.
 //
 // The hardest part of what this blob must do is to save the 64-bit %o
 // registers in the 32-bit build.  A simple 'save' turn the %o's to %i's and
 // an interrupt will chop off their heads.  Making space in the caller's frame
 // first will let us save the 64-bit %o's before save'ing, but we cannot hand
 // the adjusted FP off to the GC stack-crawler: this will modify the caller's
 // SP and mess up HIS OopMaps.  So we first adjust the caller's SP, then save
 // the 64-bit %o's, then do a save, then fixup the caller's SP (our FP).
 // Tricky, tricky, tricky...
 SafepointBlob* SharedRuntime::generate_handler_blob(address call_ptr, int poll_type) {
   assert (StubRoutines::forward_exception_entry() != NULL, "must be generated before");
   // allocate space for the code
   ResourceMark rm;
   // setup code generation tools
   // Measured 8/7/03 at 896 in 32bit debug build (no VerifyThread)
   // Measured 8/7/03 at 1080 in 32bit debug build (VerifyThread)
   // even larger with TraceJumps
   int pad = TraceJumps ? 512 : 0;
   CodeBuffer buffer("handler_blob", 1600 + pad, 512);
   MacroAssembler* masm                = new MacroAssembler(&buffer);
   int             frame_size_words;
   OopMapSet *oop_maps = new OopMapSet();
   OopMap* map = NULL;
   int start = __ offset();
   bool cause_return = (poll_type == POLL_AT_RETURN);
   // If this causes a return before the processing, then do a "restore"
   if (cause_return) {
     __ restore();
   } else {
     // Make it look like we were called via the poll
     // so that frame constructor always sees a valid return address
     __ ld_ptr(G2_thread, in_bytes(JavaThread::saved_exception_pc_offset()), O7);
     __ sub(O7, frame::pc_return_offset, O7);
   }
   map = RegisterSaver::save_live_registers(masm, 0, &frame_size_words);
   // setup last_Java_sp (blows G4)
   __ set_last_Java_frame(SP, noreg);
   // call into the runtime to handle illegal instructions exception
   // Do not use call_VM_leaf, because we need to make a GC map at this call site.
   __ mov(G2_thread, O0);
   __ save_thread(L7_thread_cache);
   __ call(call_ptr);
   __ delayed()->nop();
   // Set an oopmap for the call site.
   // We need this not only for callee-saved registers, but also for volatile
   // registers that the compiler might be keeping live across a safepoint.
   oop_maps->add_gc_map( __ offset() - start, map);
   __ restore_thread(L7_thread_cache);
   // clear last_Java_sp
   __ reset_last_Java_frame();
   // Check for exceptions
   Label pending;
   __ ld_ptr(G2_thread, in_bytes(Thread::pending_exception_offset()), O1);
   __ br_notnull_short(O1, Assembler::pn, pending);
   RegisterSaver::restore_live_registers(masm);
   // We are back the the original state on entry and ready to go.
   __ retl();
   __ delayed()->nop();
   // Pending exception after the safepoint
   __ bind(pending);
   RegisterSaver::restore_live_registers(masm);
   // We are back the the original state on entry.
   // Tail-call forward_exception_entry, with the issuing PC in O7,
   // so it looks like the original nmethod called forward_exception_entry.
   __ set((intptr_t)StubRoutines::forward_exception_entry(), O0);
   __ JMP(O0, 0);
   __ delayed()->nop();
   // -------------
   // make sure all code is generated
   masm->flush();
   // return exception blob
   return SafepointBlob::create(&buffer, oop_maps, frame_size_words);
 }
 //
 // generate_resolve_blob - call resolution (static/virtual/opt-virtual/ic-miss
 //
 // Generate a stub that calls into vm to find out the proper destination
 // of a java call. All the argument registers are live at this point
 // but since this is generic code we don't know what they are and the caller
 // must do any gc of the args.
 //
 RuntimeStub* SharedRuntime::generate_resolve_blob(address destination, const char* name) {
   assert (StubRoutines::forward_exception_entry() != NULL, "must be generated before");
   // allocate space for the code
   ResourceMark rm;
   // setup code generation tools
   // Measured 8/7/03 at 896 in 32bit debug build (no VerifyThread)
   // Measured 8/7/03 at 1080 in 32bit debug build (VerifyThread)
   // even larger with TraceJumps
   int pad = TraceJumps ? 512 : 0;
   CodeBuffer buffer(name, 1600 + pad, 512);
   MacroAssembler* masm                = new MacroAssembler(&buffer);
   int             frame_size_words;
   OopMapSet *oop_maps = new OopMapSet();
   OopMap* map = NULL;
   int start = __ offset();
   map = RegisterSaver::save_live_registers(masm, 0, &frame_size_words);
   int frame_complete = __ offset();
   // setup last_Java_sp (blows G4)
   __ set_last_Java_frame(SP, noreg);
   // call into the runtime to handle illegal instructions exception
   // Do not use call_VM_leaf, because we need to make a GC map at this call site.
   __ mov(G2_thread, O0);
   __ save_thread(L7_thread_cache);
   __ call(destination, relocInfo::runtime_call_type);
   __ delayed()->nop();
   // O0 contains the address we are going to jump to assuming no exception got installed
   // Set an oopmap for the call site.
   // We need this not only for callee-saved registers, but also for volatile
   // registers that the compiler might be keeping live across a safepoint.
   oop_maps->add_gc_map( __ offset() - start, map);
   __ restore_thread(L7_thread_cache);
   // clear last_Java_sp
   __ reset_last_Java_frame();
   // Check for exceptions
   Label pending;
   __ ld_ptr(G2_thread, in_bytes(Thread::pending_exception_offset()), O1);
   __ br_notnull_short(O1, Assembler::pn, pending);
   // get the returned Method*
   __ get_vm_result_2(G5_method);
   __ stx(G5_method, SP, RegisterSaver::G5_offset()+STACK_BIAS);
   // O0 is where we want to jump, overwrite G3 which is saved and scratch
   __ stx(O0, SP, RegisterSaver::G3_offset()+STACK_BIAS);
   RegisterSaver::restore_live_registers(masm);
   // We are back the the original state on entry and ready to go.
   __ JMP(G3, 0);
   __ delayed()->nop();
   // Pending exception after the safepoint
   __ bind(pending);
   RegisterSaver::restore_live_registers(masm);
   // We are back the the original state on entry.
   // Tail-call forward_exception_entry, with the issuing PC in O7,
   // so it looks like the original nmethod called forward_exception_entry.
   __ set((intptr_t)StubRoutines::forward_exception_entry(), O0);
   __ JMP(O0, 0);
   __ delayed()->nop();
   // -------------
   // make sure all code is generated
   masm->flush();
   // return the  blob
   // frame_size_words or bytes??
   return RuntimeStub::new_runtime_stub(name, &buffer, frame_complete, frame_size_words, oop_maps, true);
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

src/cpu/sparc/vm/sharedRuntime_sparc.cpp@a6e09d6dd8e5 (annotated)

src/cpu/sparc/vm/sharedRuntime_sparc.cpp