1 /*
   2  * Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "c1/c1_FrameMap.hpp"
  27 #include "c1/c1_LIR.hpp"
  28 #include "runtime/sharedRuntime.hpp"
  29 #ifdef TARGET_ARCH_x86
  30 # include "vmreg_x86.inline.hpp"
  31 #endif
  32 #ifdef TARGET_ARCH_sparc
  33 # include "vmreg_sparc.inline.hpp"
  34 #endif
  35 #ifdef TARGET_ARCH_zero
  36 # include "vmreg_zero.inline.hpp"
  37 #endif
  38 #ifdef TARGET_ARCH_arm
  39 # include "vmreg_arm.inline.hpp"
  40 #endif
  41 #ifdef TARGET_ARCH_ppc
  42 # include "vmreg_ppc.inline.hpp"
  43 #endif
  44 
  45 
  46 
  47 //-----------------------------------------------------
  48 
  49 // Convert method signature into an array of BasicTypes for the arguments
  50 BasicTypeArray* FrameMap::signature_type_array_for(const ciMethod* method) {
  51   ciSignature* sig = method->signature();
  52   BasicTypeList* sta = new BasicTypeList(method->arg_size());
  53   // add receiver, if any
  54   if (!method->is_static()) sta->append(T_OBJECT);
  55   // add remaining arguments
  56   for (int i = 0; i < sig->count(); i++) {
  57     ciType* type = sig->type_at(i);
  58     BasicType t = type->basic_type();
  59     if (t == T_ARRAY) {
  60       t = T_OBJECT;
  61     }
  62     sta->append(t);
  63   }
  64   // done
  65   return sta;
  66 }
  67 
  68 
  69 CallingConvention* FrameMap::java_calling_convention(const BasicTypeArray* signature, bool outgoing) {
  70   // compute the size of the arguments first.  The signature array
  71   // that java_calling_convention takes includes a T_VOID after double
  72   // work items but our signatures do not.
  73   int i;
  74   int sizeargs = 0;
  75   for (i = 0; i < signature->length(); i++) {
  76     sizeargs += type2size[signature->at(i)];
  77   }
  78 
  79   BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
  80   VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
  81   int sig_index = 0;
  82   for (i = 0; i < sizeargs; i++, sig_index++) {
  83     sig_bt[i] = signature->at(sig_index);
  84     if (sig_bt[i] == T_LONG || sig_bt[i] == T_DOUBLE) {
  85       sig_bt[i + 1] = T_VOID;
  86       i++;
  87     }
  88   }
  89 
  90   intptr_t out_preserve = SharedRuntime::java_calling_convention(sig_bt, regs, sizeargs, outgoing);
  91   LIR_OprList* args = new LIR_OprList(signature->length());
  92   for (i = 0; i < sizeargs;) {
  93     BasicType t = sig_bt[i];
  94     assert(t != T_VOID, "should be skipping these");
  95     LIR_Opr opr = map_to_opr(t, regs + i, outgoing);
  96     args->append(opr);
  97     if (opr->is_address()) {
  98       LIR_Address* addr = opr->as_address_ptr();
  99       assert(addr->disp() == (int)addr->disp(), "out of range value");
 100       out_preserve = MAX2(out_preserve, (intptr_t)(addr->disp() - STACK_BIAS) / 4);
 101     }
 102     i += type2size[t];
 103   }
 104   assert(args->length() == signature->length(), "size mismatch");
 105   out_preserve += SharedRuntime::out_preserve_stack_slots();
 106 
 107   if (outgoing) {
 108     // update the space reserved for arguments.
 109     update_reserved_argument_area_size(out_preserve * BytesPerWord);
 110   }
 111   return new CallingConvention(args, out_preserve);
 112 }
 113 
 114 
 115 CallingConvention* FrameMap::c_calling_convention(const BasicTypeArray* signature) {
 116   // compute the size of the arguments first.  The signature array
 117   // that java_calling_convention takes includes a T_VOID after double
 118   // work items but our signatures do not.
 119   int i;
 120   int sizeargs = 0;
 121   for (i = 0; i < signature->length(); i++) {
 122     sizeargs += type2size[signature->at(i)];
 123   }
 124 
 125   BasicType* sig_bt = NEW_RESOURCE_ARRAY(BasicType, sizeargs);
 126   VMRegPair* regs = NEW_RESOURCE_ARRAY(VMRegPair, sizeargs);
 127   int sig_index = 0;
 128   for (i = 0; i < sizeargs; i++, sig_index++) {
 129     sig_bt[i] = signature->at(sig_index);
 130     if (sig_bt[i] == T_LONG || sig_bt[i] == T_DOUBLE) {
 131       sig_bt[i + 1] = T_VOID;
 132       i++;
 133     }
 134   }
 135 
 136   intptr_t out_preserve = SharedRuntime::c_calling_convention(sig_bt, regs, NULL, sizeargs);
 137   LIR_OprList* args = new LIR_OprList(signature->length());
 138   for (i = 0; i < sizeargs;) {
 139     BasicType t = sig_bt[i];
 140     assert(t != T_VOID, "should be skipping these");
 141 
 142     // C calls are always outgoing
 143     bool outgoing = true;
 144     LIR_Opr opr = map_to_opr(t, regs + i, outgoing);
 145     // they might be of different types if for instance floating point
 146     // values are passed in cpu registers, but the sizes must match.
 147     assert(type2size[opr->type()] == type2size[t], "type mismatch");
 148     args->append(opr);
 149     if (opr->is_address()) {
 150       LIR_Address* addr = opr->as_address_ptr();
 151       out_preserve = MAX2(out_preserve, (intptr_t)(addr->disp() - STACK_BIAS) / 4);
 152     }
 153     i += type2size[t];
 154   }
 155   assert(args->length() == signature->length(), "size mismatch");
 156   out_preserve += SharedRuntime::out_preserve_stack_slots();
 157   update_reserved_argument_area_size(out_preserve * BytesPerWord);
 158   return new CallingConvention(args, out_preserve);
 159 }
 160 
 161 
 162 //--------------------------------------------------------
 163 //               FrameMap
 164 //--------------------------------------------------------
 165 
 166 bool      FrameMap::_init_done = false;
 167 Register  FrameMap::_cpu_rnr2reg [FrameMap::nof_cpu_regs];
 168 int       FrameMap::_cpu_reg2rnr [FrameMap::nof_cpu_regs];
 169 
 170 
 171 FrameMap::FrameMap(ciMethod* method, int monitors, int reserved_argument_area_size) {
 172   assert(_init_done, "should already be completed");
 173 
 174   _framesize = -1;
 175   _num_spills = -1;
 176 
 177   assert(monitors >= 0, "not set");
 178   _num_monitors = monitors;
 179   assert(reserved_argument_area_size >= 0, "not set");
 180   _reserved_argument_area_size = MAX2(4, reserved_argument_area_size) * BytesPerWord;
 181 
 182   _argcount = method->arg_size();
 183   _argument_locations = new intArray(_argcount, -1);
 184   _incoming_arguments = java_calling_convention(signature_type_array_for(method), false);
 185   _oop_map_arg_count = _incoming_arguments->reserved_stack_slots();
 186 
 187   int java_index = 0;
 188   for (int i = 0; i < _incoming_arguments->length(); i++) {
 189     LIR_Opr opr = _incoming_arguments->at(i);
 190     if (opr->is_address()) {
 191       LIR_Address* address = opr->as_address_ptr();
 192       _argument_locations->at_put(java_index, address->disp() - STACK_BIAS);
 193       _incoming_arguments->args()->at_put(i, LIR_OprFact::stack(java_index, as_BasicType(as_ValueType(address->type()))));
 194     }
 195     java_index += type2size[opr->type()];
 196   }
 197 
 198 }
 199 
 200 
 201 bool FrameMap::finalize_frame(int nof_slots) {
 202   assert(nof_slots >= 0, "must be positive");
 203   assert(_num_spills == -1, "can only be set once");
 204   _num_spills = nof_slots;
 205   assert(_framesize == -1, "should only be calculated once");
 206   _framesize =  round_to(in_bytes(sp_offset_for_monitor_base(0)) +
 207                          _num_monitors * sizeof(BasicObjectLock) +
 208                          sizeof(intptr_t) +                        // offset of deopt orig pc
 209                          frame_pad_in_bytes,
 210                          StackAlignmentInBytes) / 4;
 211   int java_index = 0;
 212   for (int i = 0; i < _incoming_arguments->length(); i++) {
 213     LIR_Opr opr = _incoming_arguments->at(i);
 214     if (opr->is_stack()) {
 215       _argument_locations->at_put(java_index, in_bytes(framesize_in_bytes()) +
 216                                   _argument_locations->at(java_index));
 217     }
 218     java_index += type2size[opr->type()];
 219   }
 220   // make sure it's expressible on the platform
 221   return validate_frame();
 222 }
 223 
 224 VMReg FrameMap::sp_offset2vmreg(ByteSize offset) const {
 225   int offset_in_bytes = in_bytes(offset);
 226   assert(offset_in_bytes % 4 == 0, "must be multiple of 4 bytes");
 227   assert(offset_in_bytes / 4 < framesize() + oop_map_arg_count(), "out of range");
 228   return VMRegImpl::stack2reg(offset_in_bytes / 4);
 229 }
 230 
 231 
 232 bool FrameMap::location_for_sp_offset(ByteSize byte_offset_from_sp,
 233                                       Location::Type loc_type,
 234                                       Location* loc) const {
 235   int offset = in_bytes(byte_offset_from_sp);
 236   assert(offset >= 0, "incorrect offset");
 237   if (!Location::legal_offset_in_bytes(offset)) {
 238     return false;
 239   }
 240   Location tmp_loc = Location::new_stk_loc(loc_type, offset);
 241   *loc = tmp_loc;
 242   return true;
 243 }
 244 
 245 
 246 bool FrameMap::locations_for_slot  (int index, Location::Type loc_type,
 247                                      Location* loc, Location* second) const {
 248   ByteSize offset_from_sp = sp_offset_for_slot(index);
 249   if (!location_for_sp_offset(offset_from_sp, loc_type, loc)) {
 250     return false;
 251   }
 252   if (second != NULL) {
 253     // two word item
 254     offset_from_sp = offset_from_sp + in_ByteSize(4);
 255     return location_for_sp_offset(offset_from_sp, loc_type, second);
 256   }
 257   return true;
 258 }
 259 
 260 //////////////////////
 261 // Public accessors //
 262 //////////////////////
 263 
 264 
 265 ByteSize FrameMap::sp_offset_for_slot(const int index) const {
 266   if (index < argcount()) {
 267     int offset = _argument_locations->at(index);
 268     assert(offset != -1, "not a memory argument");
 269     assert(offset >= framesize() * 4, "argument inside of frame");
 270     return in_ByteSize(offset);
 271   }
 272   ByteSize offset = sp_offset_for_spill(index - argcount());
 273   assert(in_bytes(offset) < framesize() * 4, "spill outside of frame");
 274   return offset;
 275 }
 276 
 277 
 278 ByteSize FrameMap::sp_offset_for_double_slot(const int index) const {
 279   ByteSize offset = sp_offset_for_slot(index);
 280   if (index >= argcount()) {
 281     assert(in_bytes(offset) + 4 < framesize() * 4, "spill outside of frame");
 282   }
 283   return offset;
 284 }
 285 
 286 
 287 ByteSize FrameMap::sp_offset_for_spill(const int index) const {
 288   assert(index >= 0 && index < _num_spills, "out of range");
 289   int offset = round_to(first_available_sp_in_frame + _reserved_argument_area_size, sizeof(double)) +
 290     index * spill_slot_size_in_bytes;
 291   return in_ByteSize(offset);
 292 }
 293 
 294 ByteSize FrameMap::sp_offset_for_monitor_base(const int index) const {
 295   int end_of_spills = round_to(first_available_sp_in_frame + _reserved_argument_area_size, sizeof(double)) +
 296     _num_spills * spill_slot_size_in_bytes;
 297   int offset = (int) round_to(end_of_spills, HeapWordSize) + index * sizeof(BasicObjectLock);
 298   return in_ByteSize(offset);
 299 }
 300 
 301 ByteSize FrameMap::sp_offset_for_monitor_lock(int index) const {
 302   check_monitor_index(index);
 303   return sp_offset_for_monitor_base(index) + in_ByteSize(BasicObjectLock::lock_offset_in_bytes());;
 304 }
 305 
 306 ByteSize FrameMap::sp_offset_for_monitor_object(int index) const {
 307   check_monitor_index(index);
 308   return sp_offset_for_monitor_base(index) + in_ByteSize(BasicObjectLock::obj_offset_in_bytes());
 309 }
 310 
 311 
 312 // For OopMaps, map a local variable or spill index to an VMReg.
 313 // This is the offset from sp() in the frame of the slot for the index,
 314 // skewed by SharedInfo::stack0 to indicate a stack location (vs.a register.)
 315 //
 316 //         C ABI size +
 317 //         framesize +     framesize +
 318 //         stack0          stack0         stack0          0 <- VMReg->value()
 319 //            |              |              | <registers> |
 320 //  ..........|..............|..............|.............|
 321 //    0 1 2 3 | <C ABI area> | 4 5 6 ...... |               <- local indices
 322 //    ^                        ^          sp()
 323 //    |                        |
 324 //  arguments            non-argument locals
 325 
 326 
 327 VMReg FrameMap::regname(LIR_Opr opr) const {
 328   if (opr->is_single_cpu()) {
 329     assert(!opr->is_virtual(), "should not see virtual registers here");
 330     return opr->as_register()->as_VMReg();
 331   } else if (opr->is_single_stack()) {
 332     return sp_offset2vmreg(sp_offset_for_slot(opr->single_stack_ix()));
 333   } else if (opr->is_address()) {
 334     LIR_Address* addr = opr->as_address_ptr();
 335     assert(addr->base() == stack_pointer(), "sp based addressing only");
 336     return sp_offset2vmreg(in_ByteSize(addr->index()->as_jint()));
 337   }
 338   ShouldNotReachHere();
 339   return VMRegImpl::Bad();
 340 }
 341 
 342 
 343 
 344 
 345 // ------------ extra spill slots ---------------