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 /*

  * Copyright (c) 2000, 2010, 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

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  */

 #include "precompiled.hpp"

 #include "c1/c1_FrameMap.hpp"

 #include "c1/c1_LIR.hpp"

 #include "runtime/sharedRuntime.hpp"

 #ifdef TARGET_ARCH_x86

 # include "vmreg_x86.inline.hpp"

 #endif

 #ifdef TARGET_ARCH_sparc

 # include "vmreg_sparc.inline.hpp"

 #endif

 #ifdef TARGET_ARCH_zero

 # include "vmreg_zero.inline.hpp"

 #endif

 //-----------------------------------------------------

 // Convert method signature into an array of BasicTypes for the arguments

 BasicTypeArray* FrameMap::signature_type_array_for(const ciMethod* method) {

   ciSignature* sig = method->signature();

   BasicTypeList* sta = new BasicTypeList(method->arg_size());

   // add receiver, if any

   if (!method->is_static()) sta->append(T_OBJECT);

   // add remaining arguments

   for (int i = 0; i < sig->count(); i++) {

     ciType* type = sig->type_at(i);

     BasicType t = type->basic_type();

     if (t == T_ARRAY) {

       t = T_OBJECT;

     }

     sta->append(t);

   }

   // done

   return sta;

 }

 CallingConvention* FrameMap::java_calling_convention(const BasicTypeArray* signature, bool outgoing) {

   // compute the size of the arguments first.  The signature array

   // that java_calling_convention takes includes a T_VOID after double

   // work items but our signatures do not.

   int i;

   int sizeargs = 0;

   for (i = 0; i < signature->length(); i++) {

     sizeargs += type2size[signature->at(i)];

   }

   BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);

   VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);

   int sig_index = 0;

   for (i = 0; i < sizeargs; i++, sig_index++) {

     sig_bt[i] = signature->at(sig_index);

     if (sig_bt[i] == T_LONG || sig_bt[i] == T_DOUBLE) {

       sig_bt[i + 1] = T_VOID;

       i++;

     }

   }

   intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, outgoing);

   LIR_OprList* args = new LIR_OprList(signature->length());

   for (i = 0; i < sizeargs;) {

     BasicType t = sig_bt[i];

     assert(t != T_VOID, "should be skipping these");

     LIR_Opr opr = map_to_opr(t, regs + i, outgoing);

     args->append(opr);

     if (opr->is_address()) {

       LIR_Address* addr = opr->as_address_ptr();

       assert(addr->disp() == (int)addr->disp(), "out of range value");

       out_preserve = MAX2(out_preserve, (intptr_t)(addr->disp() - STACK_BIAS) / 4);

     }

     i += type2size[t];

   }

   assert(args->length() == signature->length(), "size mismatch");

   out_preserve += SharedRuntime::out_preserve_stack_slots();

   if (outgoing) {

     // update the space reserved for arguments.

     update_reserved_argument_area_size(out_preserve * BytesPerWord);

   }

   return new CallingConvention(args, out_preserve);

 }

 CallingConvention* FrameMap::c_calling_convention(const BasicTypeArray* signature) {

   // compute the size of the arguments first.  The signature array

   // that java_calling_convention takes includes a T_VOID after double

   // work items but our signatures do not.

   int i;

   int sizeargs = 0;

   for (i = 0; i < signature->length(); i++) {

     sizeargs += type2size[signature->at(i)];

   }

   BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);

   VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);

   int sig_index = 0;

   for (i = 0; i < sizeargs; i++, sig_index++) {

     sig_bt[i] = signature->at(sig_index);

     if (sig_bt[i] == T_LONG || sig_bt[i] == T_DOUBLE) {

       sig_bt[i + 1] = T_VOID;

       i++;

     }

   }

   intptr_t out_preserve = SharedRuntime::c_calling_convention(sig_bt, regs, sizeargs);

   LIR_OprList* args = new LIR_OprList(signature->length());

   for (i = 0; i < sizeargs;) {

     BasicType t = sig_bt[i];

     assert(t != T_VOID, "should be skipping these");

     // C calls are always outgoing

     bool outgoing = true;

     LIR_Opr opr = map_to_opr(t, regs + i, outgoing);

     // they might be of different types if for instance floating point

     // values are passed in cpu registers, but the sizes must match.

     assert(type2size[opr->type()] == type2size[t], "type mismatch");

     args->append(opr);

     if (opr->is_address()) {

       LIR_Address* addr = opr->as_address_ptr();

       out_preserve = MAX2(out_preserve, (intptr_t)(addr->disp() - STACK_BIAS) / 4);

     }

     i += type2size[t];

   }

   assert(args->length() == signature->length(), "size mismatch");

   out_preserve += SharedRuntime::out_preserve_stack_slots();

   update_reserved_argument_area_size(out_preserve * BytesPerWord);

   return new CallingConvention(args, out_preserve);

 }

 //--------------------------------------------------------

 //               FrameMap

 //--------------------------------------------------------

 bool      FrameMap::_init_done = false;

 Register  FrameMap::_cpu_rnr2reg [FrameMap::nof_cpu_regs];

 int       FrameMap::_cpu_reg2rnr [FrameMap::nof_cpu_regs];

 FrameMap::FrameMap(ciMethod* method, int monitors, int reserved_argument_area_size) {

   assert(_init_done, "should already be completed");

   _framesize = -1;

   _num_spills = -1;

   assert(monitors >= 0, "not set");

   _num_monitors = monitors;

   assert(reserved_argument_area_size >= 0, "not set");

   _reserved_argument_area_size = MAX2(4, reserved_argument_area_size) * BytesPerWord;

   _argcount = method->arg_size();

   _argument_locations = new intArray(_argcount, -1);

   _incoming_arguments = java_calling_convention(signature_type_array_for(method), false);

   _oop_map_arg_count = _incoming_arguments->reserved_stack_slots();

   int java_index = 0;

   for (int i = 0; i < _incoming_arguments->length(); i++) {

     LIR_Opr opr = _incoming_arguments->at(i);

     if (opr->is_address()) {

       LIR_Address* address = opr->as_address_ptr();

       _argument_locations->at_put(java_index, address->disp() - STACK_BIAS);

       _incoming_arguments->args()->at_put(i, LIR_OprFact::stack(java_index, as_BasicType(as_ValueType(address->type()))));

     }

     java_index += type2size[opr->type()];

   }

 }

 bool FrameMap::finalize_frame(int nof_slots) {

   assert(nof_slots >= 0, "must be positive");

   assert(_num_spills == -1, "can only be set once");

   _num_spills = nof_slots;

   assert(_framesize == -1, "should only be calculated once");

   _framesize =  round_to(in_bytes(sp_offset_for_monitor_base(0)) +

                          _num_monitors * sizeof(BasicObjectLock) +

                          sizeof(intptr_t) +                        // offset of deopt orig pc

                          frame_pad_in_bytes,

                          StackAlignmentInBytes) / 4;

   int java_index = 0;

   for (int i = 0; i < _incoming_arguments->length(); i++) {

     LIR_Opr opr = _incoming_arguments->at(i);

     if (opr->is_stack()) {

       _argument_locations->at_put(java_index, in_bytes(framesize_in_bytes()) +

                                   _argument_locations->at(java_index));

     }

     java_index += type2size[opr->type()];

   }

   // make sure it's expressible on the platform

   return validate_frame();

 }

 VMReg FrameMap::sp_offset2vmreg(ByteSize offset) const {

   int offset_in_bytes = in_bytes(offset);

   assert(offset_in_bytes % 4 == 0, "must be multiple of 4 bytes");

   assert(offset_in_bytes / 4 < framesize() + oop_map_arg_count(), "out of range");

   return VMRegImpl::stack2reg(offset_in_bytes / 4);

 }

 bool FrameMap::location_for_sp_offset(ByteSize byte_offset_from_sp,

                                       Location::Type loc_type,

                                       Location* loc) const {

   int offset = in_bytes(byte_offset_from_sp);

   assert(offset >= 0, "incorrect offset");

   if (!Location::legal_offset_in_bytes(offset)) {

     return false;

   }

   Location tmp_loc = Location::new_stk_loc(loc_type, offset);

   *loc = tmp_loc;

   return true;

 }

 bool FrameMap::locations_for_slot  (int index, Location::Type loc_type,

                                      Location* loc, Location* second) const {

   ByteSize offset_from_sp = sp_offset_for_slot(index);

   if (!location_for_sp_offset(offset_from_sp, loc_type, loc)) {

     return false;

   }

   if (second != NULL) {

     // two word item

     offset_from_sp = offset_from_sp + in_ByteSize(4);

     return location_for_sp_offset(offset_from_sp, loc_type, second);

   }

   return true;

 }

 //////////////////////

 // Public accessors //

 //////////////////////

 ByteSize FrameMap::sp_offset_for_slot(const int index) const {

   if (index < argcount()) {

     int offset = _argument_locations->at(index);

     assert(offset != -1, "not a memory argument");

     assert(offset >= framesize() * 4, "argument inside of frame");

     return in_ByteSize(offset);

   }

   ByteSize offset = sp_offset_for_spill(index - argcount());

   assert(in_bytes(offset) < framesize() * 4, "spill outside of frame");

   return offset;

 }

 ByteSize FrameMap::sp_offset_for_double_slot(const int index) const {

   ByteSize offset = sp_offset_for_slot(index);

   if (index >= argcount()) {

     assert(in_bytes(offset) + 4 < framesize() * 4, "spill outside of frame");

   }

   return offset;

 }

 ByteSize FrameMap::sp_offset_for_spill(const int index) const {

   assert(index >= 0 && index < _num_spills, "out of range");

   int offset = round_to(first_available_sp_in_frame + _reserved_argument_area_size, sizeof(double)) +

     index * spill_slot_size_in_bytes;

   return in_ByteSize(offset);

 }

 ByteSize FrameMap::sp_offset_for_monitor_base(const int index) const {

   int end_of_spills = round_to(first_available_sp_in_frame + _reserved_argument_area_size, sizeof(double)) +

     _num_spills * spill_slot_size_in_bytes;

   int offset = (int) round_to(end_of_spills, HeapWordSize) + index * sizeof(BasicObjectLock);

   return in_ByteSize(offset);

 }

 ByteSize FrameMap::sp_offset_for_monitor_lock(int index) const {

   check_monitor_index(index);

   return sp_offset_for_monitor_base(index) + in_ByteSize(BasicObjectLock::lock_offset_in_bytes());;

 }

 ByteSize FrameMap::sp_offset_for_monitor_object(int index) const {

   check_monitor_index(index);

   return sp_offset_for_monitor_base(index) + in_ByteSize(BasicObjectLock::obj_offset_in_bytes());

 }

 void FrameMap::print_frame_layout() const {

   int svar;

   tty->print_cr("#####################################");

   tty->print_cr("Frame size in words %d", framesize());

   if( _num_monitors > 0) {

     tty->print_cr("monitor [0]:%d | [%2d]:%d",

                   in_bytes(sp_offset_for_monitor_base(0)),

                   in_bytes(sp_offset_for_monitor_base(_num_monitors)));

   }

   if( _num_spills > 0) {

     svar = _num_spills - 1;

     if(svar == 0)

       tty->print_cr("spill   [0]:%d", in_bytes(sp_offset_for_spill(0)));

     else

       tty->print_cr("spill   [0]:%d | [%2d]:%d", in_bytes(sp_offset_for_spill(0)),

                     svar,

                     in_bytes(sp_offset_for_spill(svar)));

   }

 }

 // For OopMaps, map a local variable or spill index to an VMReg.

 // This is the offset from sp() in the frame of the slot for the index,

 // skewed by SharedInfo::stack0 to indicate a stack location (vs.a register.)

 //

 //         C ABI size +

 //         framesize +     framesize +

 //         stack0          stack0         stack0          0 <- VMReg->value()

 //            |              |              | <registers> |

 //  ..........|..............|..............|.............|

 //    0 1 2 3 | <C ABI area> | 4 5 6 ...... |               <- local indices

 //    ^                        ^          sp()

 //    |                        |

 //  arguments            non-argument locals

 VMReg FrameMap::regname(LIR_Opr opr) const {

   if (opr->is_single_cpu()) {

     assert(!opr->is_virtual(), "should not see virtual registers here");

     return opr->as_register()->as_VMReg();

   } else if (opr->is_single_stack()) {

     return sp_offset2vmreg(sp_offset_for_slot(opr->single_stack_ix()));

   } else if (opr->is_address()) {

     LIR_Address* addr = opr->as_address_ptr();

     assert(addr->base() == stack_pointer(), "sp based addressing only");

     return sp_offset2vmreg(in_ByteSize(addr->index()->as_jint()));

   }

   ShouldNotReachHere();

   return VMRegImpl::Bad();

 }

 // ------------ extra spill slots ---------------