1 /*
   2  * Copyright (c) 1997, 2016, 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 "interpreter/interpreter.hpp"
  27 #include "memory/resourceArea.hpp"
  28 #include "oops/markOop.hpp"
  29 #include "oops/method.hpp"
  30 #include "oops/oop.inline.hpp"
  31 #include "prims/methodHandles.hpp"
  32 #include "runtime/frame.inline.hpp"
  33 #include "runtime/handles.inline.hpp"
  34 #include "runtime/javaCalls.hpp"
  35 #include "runtime/monitorChunk.hpp"
  36 #include "runtime/os.inline.hpp"
  37 #include "runtime/signature.hpp"
  38 #include "runtime/stubCodeGenerator.hpp"
  39 #include "runtime/stubRoutines.hpp"
  40 #include "vmreg_x86.inline.hpp"
  41 #ifdef COMPILER1
  42 #include "c1/c1_Runtime1.hpp"
  43 #include "runtime/vframeArray.hpp"
  44 #endif
  45 
  46 #ifdef ASSERT
  47 void RegisterMap::check_location_valid() {
  48 }
  49 #endif
  50 
  51 // Profiling/safepoint support
  52 
  53 bool frame::safe_for_sender(JavaThread *thread) {
  54   address   sp = (address)_sp;
  55   address   fp = (address)_fp;
  56   address   unextended_sp = (address)_unextended_sp;
  57 
  58   // consider stack guards when trying to determine "safe" stack pointers
  59   static size_t stack_guard_size = os::uses_stack_guard_pages() ?
  60     JavaThread::stack_red_zone_size() + JavaThread::stack_yellow_zone_size() : 0;
  61   size_t usable_stack_size = thread->stack_size() - stack_guard_size;
  62 
  63   // sp must be within the usable part of the stack (not in guards)
  64   bool sp_safe = (sp < thread->stack_base()) &&
  65                  (sp >= thread->stack_base() - usable_stack_size);
  66 
  67 
  68   if (!sp_safe) {
  69     return false;
  70   }
  71 
  72   // unextended sp must be within the stack and above or equal sp
  73   bool unextended_sp_safe = (unextended_sp < thread->stack_base()) &&
  74                             (unextended_sp >= sp);
  75 
  76   if (!unextended_sp_safe) {
  77     return false;
  78   }
  79 
  80   // an fp must be within the stack and above (but not equal) sp
  81   // second evaluation on fp+ is added to handle situation where fp is -1
  82   bool fp_safe = (fp < thread->stack_base() && (fp > sp) && (((fp + (return_addr_offset * sizeof(void*))) < thread->stack_base())));
  83 
  84   // We know sp/unextended_sp are safe only fp is questionable here
  85 
  86   // If the current frame is known to the code cache then we can attempt to
  87   // to construct the sender and do some validation of it. This goes a long way
  88   // toward eliminating issues when we get in frame construction code
  89 
  90   if (_cb != NULL ) {
  91 
  92     // First check if frame is complete and tester is reliable
  93     // Unfortunately we can only check frame complete for runtime stubs and nmethod
  94     // other generic buffer blobs are more problematic so we just assume they are
  95     // ok. adapter blobs never have a frame complete and are never ok.
  96 
  97     if (!_cb->is_frame_complete_at(_pc)) {
  98       if (_cb->is_compiled() || _cb->is_adapter_blob() || _cb->is_runtime_stub()) {
  99         return false;
 100       }
 101     }
 102 
 103     // Could just be some random pointer within the codeBlob
 104     if (!_cb->code_contains(_pc)) {
 105       return false;
 106     }
 107 
 108     // Entry frame checks
 109     if (is_entry_frame()) {
 110       // an entry frame must have a valid fp.
 111 
 112       if (!fp_safe) return false;
 113 
 114       return entry_frame_is_safe(thread);







 115     }
 116 
 117     intptr_t* sender_sp = NULL;
 118     intptr_t* sender_unextended_sp = NULL;
 119     address   sender_pc = NULL;
 120     intptr_t* saved_fp =  NULL;
 121 
 122     if (is_interpreted_frame()) {
 123       // fp must be safe
 124       if (!fp_safe) {
 125         return false;
 126       }
 127 
 128       sender_pc = (address) this->fp()[return_addr_offset];
 129       // for interpreted frames, the value below is the sender "raw" sp,
 130       // which can be different from the sender unextended sp (the sp seen
 131       // by the sender) because of current frame local variables
 132       sender_sp = (intptr_t*) addr_at(sender_sp_offset);
 133       sender_unextended_sp = (intptr_t*) this->fp()[interpreter_frame_sender_sp_offset];
 134       saved_fp = (intptr_t*) this->fp()[link_offset];
 135 
 136     } else {
 137       // must be some sort of compiled/runtime frame
 138       // fp does not have to be safe (although it could be check for c1?)
 139 
 140       // check for a valid frame_size, otherwise we are unlikely to get a valid sender_pc
 141       if (_cb->frame_size() <= 0) {
 142         return false;
 143       }
 144 
 145       sender_sp = _unextended_sp + _cb->frame_size();
 146       sender_unextended_sp = sender_sp;
 147       // On Intel the return_address is always the word on the stack
 148       sender_pc = (address) *(sender_sp-1);
 149       // Note: frame::sender_sp_offset is only valid for compiled frame
 150       saved_fp = (intptr_t*) *(sender_sp - frame::sender_sp_offset);
 151     }
 152 
 153 
 154     // If the potential sender is the interpreter then we can do some more checking
 155     if (Interpreter::contains(sender_pc)) {
 156 
 157       // ebp is always saved in a recognizable place in any code we generate. However
 158       // only if the sender is interpreted/call_stub (c1 too?) are we certain that the saved ebp
 159       // is really a frame pointer.
 160 
 161       bool saved_fp_safe = ((address)saved_fp < thread->stack_base()) && (saved_fp > sender_sp);
 162 
 163       if (!saved_fp_safe) {
 164         return false;
 165       }
 166 
 167       // construct the potential sender
 168 
 169       frame sender(sender_sp, sender_unextended_sp, saved_fp, sender_pc);
 170 
 171       return sender.is_interpreted_frame_valid(thread);
 172 
 173     }
 174 
 175     // We must always be able to find a recognizable pc
 176     CodeBlob* sender_blob = CodeCache::find_blob_unsafe(sender_pc);
 177     if (sender_pc == NULL ||  sender_blob == NULL) {
 178       return false;
 179     }
 180 
 181     // Could be a zombie method
 182     if (sender_blob->is_zombie() || sender_blob->is_unloaded()) {
 183       return false;
 184     }
 185 
 186     // Could just be some random pointer within the codeBlob
 187     if (!sender_blob->code_contains(sender_pc)) {
 188       return false;
 189     }
 190 
 191     // We should never be able to see an adapter if the current frame is something from code cache
 192     if (sender_blob->is_adapter_blob()) {
 193       return false;
 194     }
 195 
 196     // Could be the call_stub
 197     if (StubRoutines::returns_to_call_stub(sender_pc)) {
 198       bool saved_fp_safe = ((address)saved_fp < thread->stack_base()) && (saved_fp > sender_sp);
 199 
 200       if (!saved_fp_safe) {
 201         return false;
 202       }
 203 
 204       // construct the potential sender

 205       frame sender(sender_sp, sender_unextended_sp, saved_fp, sender_pc);
 206       return sender.entry_frame_is_safe(thread);






 207     }
 208 
 209     CompiledMethod* nm = sender_blob->as_compiled_method_or_null();
 210     if (nm != NULL) {
 211         if (nm->is_deopt_mh_entry(sender_pc) || nm->is_deopt_entry(sender_pc) ||
 212             nm->method()->is_method_handle_intrinsic()) {
 213             return false;
 214         }
 215     }
 216 
 217     // If the frame size is 0 something (or less) is bad because every nmethod has a non-zero frame size
 218     // because the return address counts against the callee's frame.
 219 
 220     if (sender_blob->frame_size() <= 0) {
 221       assert(!sender_blob->is_compiled(), "should count return address at least");
 222       return false;
 223     }
 224 
 225     // We should never be able to see anything here except an nmethod. If something in the
 226     // code cache (current frame) is called by an entity within the code cache that entity
 227     // should not be anything but the call stub (already covered), the interpreter (already covered)
 228     // or an nmethod.
 229 
 230     if (!sender_blob->is_compiled()) {
 231         return false;
 232     }
 233 
 234     // Could put some more validation for the potential non-interpreted sender
 235     // frame we'd create by calling sender if I could think of any. Wait for next crash in forte...
 236 
 237     // One idea is seeing if the sender_pc we have is one that we'd expect to call to current cb
 238 
 239     // We've validated the potential sender that would be created
 240     return true;
 241   }
 242 
 243   // Must be native-compiled frame. Since sender will try and use fp to find
 244   // linkages it must be safe
 245 
 246   if (!fp_safe) {
 247     return false;
 248   }
 249 
 250   // Will the pc we fetch be non-zero (which we'll find at the oldest frame)
 251 
 252   if ( (address) this->fp()[return_addr_offset] == NULL) return false;
 253 
 254 
 255   // could try and do some more potential verification of native frame if we could think of some...
 256 
 257   return true;
 258 
 259 }
 260 
 261 
 262 void frame::patch_pc(Thread* thread, address pc) {
 263   address* pc_addr = &(((address*) sp())[-1]);
 264   if (TracePcPatching) {
 265     tty->print_cr("patch_pc at address " INTPTR_FORMAT " [" INTPTR_FORMAT " -> " INTPTR_FORMAT "]",
 266                   p2i(pc_addr), p2i(*pc_addr), p2i(pc));
 267   }
 268   // Either the return address is the original one or we are going to
 269   // patch in the same address that's already there.
 270   assert(_pc == *pc_addr || pc == *pc_addr, "must be");
 271   *pc_addr = pc;
 272   _cb = CodeCache::find_blob(pc);
 273   address original_pc = CompiledMethod::get_deopt_original_pc(this);
 274   if (original_pc != NULL) {
 275     assert(original_pc == _pc, "expected original PC to be stored before patching");
 276     _deopt_state = is_deoptimized;
 277     // leave _pc as is
 278   } else {
 279     _deopt_state = not_deoptimized;
 280     _pc = pc;
 281   }
 282 }
 283 
 284 bool frame::is_interpreted_frame() const  {
 285   return Interpreter::contains(pc());
 286 }
 287 
 288 int frame::frame_size(RegisterMap* map) const {
 289   frame sender = this->sender(map);
 290   return sender.sp() - sp();
 291 }
 292 
 293 intptr_t* frame::entry_frame_argument_at(int offset) const {
 294   // convert offset to index to deal with tsi
 295   int index = (Interpreter::expr_offset_in_bytes(offset)/wordSize);
 296   // Entry frame's arguments are always in relation to unextended_sp()
 297   return &unextended_sp()[index];
 298 }
 299 
 300 // sender_sp
 301 
 302 intptr_t* frame::interpreter_frame_sender_sp() const {
 303   assert(is_interpreted_frame(), "interpreted frame expected");
 304   return (intptr_t*) at(interpreter_frame_sender_sp_offset);
 305 }
 306 
 307 void frame::set_interpreter_frame_sender_sp(intptr_t* sender_sp) {
 308   assert(is_interpreted_frame(), "interpreted frame expected");
 309   ptr_at_put(interpreter_frame_sender_sp_offset, (intptr_t) sender_sp);
 310 }
 311 
 312 
 313 // monitor elements
 314 
 315 BasicObjectLock* frame::interpreter_frame_monitor_begin() const {
 316   return (BasicObjectLock*) addr_at(interpreter_frame_monitor_block_bottom_offset);
 317 }
 318 
 319 BasicObjectLock* frame::interpreter_frame_monitor_end() const {
 320   BasicObjectLock* result = (BasicObjectLock*) *addr_at(interpreter_frame_monitor_block_top_offset);
 321   // make sure the pointer points inside the frame
 322   assert(sp() <= (intptr_t*) result, "monitor end should be above the stack pointer");
 323   assert((intptr_t*) result < fp(),  "monitor end should be strictly below the frame pointer");
 324   return result;
 325 }
 326 
 327 void frame::interpreter_frame_set_monitor_end(BasicObjectLock* value) {
 328   *((BasicObjectLock**)addr_at(interpreter_frame_monitor_block_top_offset)) = value;
 329 }
 330 
 331 // Used by template based interpreter deoptimization
 332 void frame::interpreter_frame_set_last_sp(intptr_t* sp) {
 333     *((intptr_t**)addr_at(interpreter_frame_last_sp_offset)) = sp;
 334 }
 335 
 336 frame frame::sender_for_entry_frame(RegisterMap* map) const {
 337   assert(map != NULL, "map must be set");
 338   // Java frame called from C; skip all C frames and return top C
 339   // frame of that chunk as the sender
 340   JavaFrameAnchor* jfa = entry_frame_call_wrapper()->anchor();
 341   assert(!entry_frame_is_first(), "next Java fp must be non zero");
 342   assert(jfa->last_Java_sp() > sp(), "must be above this frame on stack");
 343   map->clear();
 344   assert(map->include_argument_oops(), "should be set by clear");
 345   if (jfa->last_Java_pc() != NULL ) {
 346     frame fr(jfa->last_Java_sp(), jfa->last_Java_fp(), jfa->last_Java_pc());
 347     return fr;
 348   }
 349   frame fr(jfa->last_Java_sp(), jfa->last_Java_fp());
 350   return fr;
 351 }
 352 
 353 //------------------------------------------------------------------------------
 354 // frame::verify_deopt_original_pc
 355 //
 356 // Verifies the calculated original PC of a deoptimization PC for the
 357 // given unextended SP.
 358 #ifdef ASSERT
 359 void frame::verify_deopt_original_pc(CompiledMethod* nm, intptr_t* unextended_sp) {
 360   frame fr;
 361 
 362   // This is ugly but it's better than to change {get,set}_original_pc
 363   // to take an SP value as argument.  And it's only a debugging
 364   // method anyway.
 365   fr._unextended_sp = unextended_sp;
 366 
 367   address original_pc = nm->get_original_pc(&fr);
 368   assert(nm->insts_contains(original_pc), "original PC must be in CompiledMethod");
 369 }
 370 #endif
 371 
 372 //------------------------------------------------------------------------------
 373 // frame::adjust_unextended_sp
 374 void frame::adjust_unextended_sp() {
 375   // On x86, sites calling method handle intrinsics and lambda forms are treated
 376   // as any other call site. Therefore, no special action is needed when we are
 377   // returning to any of these call sites.
 378 
 379   if (_cb != NULL) {
 380     CompiledMethod* sender_cm = _cb->as_compiled_method_or_null();
 381     if (sender_cm != NULL) {
 382       // If the sender PC is a deoptimization point, get the original PC.
 383       if (sender_cm->is_deopt_entry(_pc) ||
 384           sender_cm->is_deopt_mh_entry(_pc)) {
 385         DEBUG_ONLY(verify_deopt_original_pc(sender_cm, _unextended_sp));
 386       }
 387     }
 388   }
 389 }
 390 
 391 //------------------------------------------------------------------------------
 392 // frame::update_map_with_saved_link
 393 void frame::update_map_with_saved_link(RegisterMap* map, intptr_t** link_addr) {
 394   // The interpreter and compiler(s) always save EBP/RBP in a known
 395   // location on entry. We must record where that location is
 396   // so this if EBP/RBP was live on callout from c2 we can find
 397   // the saved copy no matter what it called.
 398 
 399   // Since the interpreter always saves EBP/RBP if we record where it is then
 400   // we don't have to always save EBP/RBP on entry and exit to c2 compiled
 401   // code, on entry will be enough.
 402   map->set_location(rbp->as_VMReg(), (address) link_addr);
 403 #ifdef AMD64
 404   // this is weird "H" ought to be at a higher address however the
 405   // oopMaps seems to have the "H" regs at the same address and the
 406   // vanilla register.
 407   // XXXX make this go away
 408   if (true) {
 409     map->set_location(rbp->as_VMReg()->next(), (address) link_addr);
 410   }
 411 #endif // AMD64
 412 }
 413 
 414 
 415 //------------------------------------------------------------------------------
 416 // frame::sender_for_interpreter_frame
 417 frame frame::sender_for_interpreter_frame(RegisterMap* map) const {
 418   // SP is the raw SP from the sender after adapter or interpreter
 419   // extension.
 420   intptr_t* sender_sp = this->sender_sp();
 421 
 422   // This is the sp before any possible extension (adapter/locals).
 423   intptr_t* unextended_sp = interpreter_frame_sender_sp();
 424 
 425 #if defined(COMPILER2) || INCLUDE_JVMCI
 426   if (map->update_map()) {
 427     update_map_with_saved_link(map, (intptr_t**) addr_at(link_offset));
 428   }
 429 #endif // COMPILER2 || INCLUDE_JVMCI
 430 
 431   return frame(sender_sp, unextended_sp, link(), sender_pc());
 432 }
 433 
 434 
 435 //------------------------------------------------------------------------------
 436 // frame::sender_for_compiled_frame
 437 frame frame::sender_for_compiled_frame(RegisterMap* map) const {
 438   assert(map != NULL, "map must be set");
 439 
 440   // frame owned by optimizing compiler
 441   assert(_cb->frame_size() >= 0, "must have non-zero frame size");
 442   intptr_t* sender_sp = unextended_sp() + _cb->frame_size();
 443   intptr_t* unextended_sp = sender_sp;
 444 
 445   // On Intel the return_address is always the word on the stack
 446   address sender_pc = (address) *(sender_sp-1);
 447 
 448   // This is the saved value of EBP which may or may not really be an FP.
 449   // It is only an FP if the sender is an interpreter frame (or C1?).
 450   intptr_t** saved_fp_addr = (intptr_t**) (sender_sp - frame::sender_sp_offset);
 451 
 452   if (map->update_map()) {
 453     // Tell GC to use argument oopmaps for some runtime stubs that need it.
 454     // For C1, the runtime stub might not have oop maps, so set this flag
 455     // outside of update_register_map.
 456     map->set_include_argument_oops(_cb->caller_must_gc_arguments(map->thread()));
 457     if (_cb->oop_maps() != NULL) {
 458       OopMapSet::update_register_map(this, map);
 459     }
 460 
 461     // Since the prolog does the save and restore of EBP there is no oopmap
 462     // for it so we must fill in its location as if there was an oopmap entry
 463     // since if our caller was compiled code there could be live jvm state in it.
 464     update_map_with_saved_link(map, saved_fp_addr);
 465   }
 466 
 467   assert(sender_sp != sp(), "must have changed");
 468   return frame(sender_sp, unextended_sp, *saved_fp_addr, sender_pc);
 469 }
 470 
 471 
 472 //------------------------------------------------------------------------------
 473 // frame::sender
 474 frame frame::sender(RegisterMap* map) const {
 475   // Default is we done have to follow them. The sender_for_xxx will
 476   // update it accordingly
 477   map->set_include_argument_oops(false);
 478 
 479   if (is_entry_frame())       return sender_for_entry_frame(map);
 480   if (is_interpreted_frame()) return sender_for_interpreter_frame(map);
 481   assert(_cb == CodeCache::find_blob(pc()),"Must be the same");
 482 
 483   if (_cb != NULL) {
 484     return sender_for_compiled_frame(map);
 485   }
 486   // Must be native-compiled frame, i.e. the marshaling code for native
 487   // methods that exists in the core system.
 488   return frame(sender_sp(), link(), sender_pc());
 489 }
 490 
 491 bool frame::is_interpreted_frame_valid(JavaThread* thread) const {
 492   assert(is_interpreted_frame(), "Not an interpreted frame");
 493   // These are reasonable sanity checks
 494   if (fp() == 0 || (intptr_t(fp()) & (wordSize-1)) != 0) {
 495     return false;
 496   }
 497   if (sp() == 0 || (intptr_t(sp()) & (wordSize-1)) != 0) {
 498     return false;
 499   }
 500   if (fp() + interpreter_frame_initial_sp_offset < sp()) {
 501     return false;
 502   }
 503   // These are hacks to keep us out of trouble.
 504   // The problem with these is that they mask other problems
 505   if (fp() <= sp()) {        // this attempts to deal with unsigned comparison above
 506     return false;
 507   }
 508 
 509   // do some validation of frame elements
 510   // first the method
 511 
 512   Method* m = *interpreter_frame_method_addr();
 513 
 514   // validate the method we'd find in this potential sender
 515   if (!m->is_valid_method()) return false;
 516 
 517   // stack frames shouldn't be much larger than max_stack elements
 518   // this test requires the use the unextended_sp which is the sp as seen by
 519   // the current frame, and not sp which is the "raw" pc which could point
 520   // further because of local variables of the callee method inserted after
 521   // method arguments
 522   if (fp() - unextended_sp() > 1024 + m->max_stack()*Interpreter::stackElementSize) {
 523     return false;
 524   }
 525 
 526   // validate bci/bcp
 527 
 528   address bcp = interpreter_frame_bcp();
 529   if (m->validate_bci_from_bcp(bcp) < 0) {
 530     return false;
 531   }
 532 
 533   // validate ConstantPoolCache*
 534   ConstantPoolCache* cp = *interpreter_frame_cache_addr();
 535   if (cp == NULL || !cp->is_metaspace_object()) return false;
 536 
 537   // validate locals
 538 
 539   address locals =  (address) *interpreter_frame_locals_addr();
 540 
 541   if (locals > thread->stack_base() || locals < (address) fp()) return false;
 542 
 543   // We'd have to be pretty unlucky to be mislead at this point
 544   return true;
 545 }
 546 
 547 BasicType frame::interpreter_frame_result(oop* oop_result, jvalue* value_result) {
 548   assert(is_interpreted_frame(), "interpreted frame expected");
 549   Method* method = interpreter_frame_method();
 550   BasicType type = method->result_type();
 551 
 552   intptr_t* tos_addr;
 553   if (method->is_native()) {
 554     // Prior to calling into the runtime to report the method_exit the possible
 555     // return value is pushed to the native stack. If the result is a jfloat/jdouble
 556     // then ST0 is saved before EAX/EDX. See the note in generate_native_result
 557     tos_addr = (intptr_t*)sp();
 558     if (type == T_FLOAT || type == T_DOUBLE) {
 559     // QQQ seems like this code is equivalent on the two platforms
 560 #ifdef AMD64
 561       // This is times two because we do a push(ltos) after pushing XMM0
 562       // and that takes two interpreter stack slots.
 563       tos_addr += 2 * Interpreter::stackElementWords;
 564 #else
 565       tos_addr += 2;
 566 #endif // AMD64
 567     }
 568   } else {
 569     tos_addr = (intptr_t*)interpreter_frame_tos_address();
 570   }
 571 
 572   switch (type) {
 573     case T_OBJECT  :
 574     case T_ARRAY   : {
 575       oop obj;
 576       if (method->is_native()) {
 577         obj = cast_to_oop(at(interpreter_frame_oop_temp_offset));
 578       } else {
 579         oop* obj_p = (oop*)tos_addr;
 580         obj = (obj_p == NULL) ? (oop)NULL : *obj_p;
 581       }
 582       assert(obj == NULL || Universe::heap()->is_in(obj), "sanity check");
 583       *oop_result = obj;
 584       break;
 585     }
 586     case T_BOOLEAN : value_result->z = *(jboolean*)tos_addr; break;
 587     case T_BYTE    : value_result->b = *(jbyte*)tos_addr; break;
 588     case T_CHAR    : value_result->c = *(jchar*)tos_addr; break;
 589     case T_SHORT   : value_result->s = *(jshort*)tos_addr; break;
 590     case T_INT     : value_result->i = *(jint*)tos_addr; break;
 591     case T_LONG    : value_result->j = *(jlong*)tos_addr; break;
 592     case T_FLOAT   : {
 593 #ifdef AMD64
 594         value_result->f = *(jfloat*)tos_addr;
 595 #else
 596       if (method->is_native()) {
 597         jdouble d = *(jdouble*)tos_addr;  // Result was in ST0 so need to convert to jfloat
 598         value_result->f = (jfloat)d;
 599       } else {
 600         value_result->f = *(jfloat*)tos_addr;
 601       }
 602 #endif // AMD64
 603       break;
 604     }
 605     case T_DOUBLE  : value_result->d = *(jdouble*)tos_addr; break;
 606     case T_VOID    : /* Nothing to do */ break;
 607     default        : ShouldNotReachHere();
 608   }
 609 
 610   return type;
 611 }
 612 
 613 
 614 intptr_t* frame::interpreter_frame_tos_at(jint offset) const {
 615   int index = (Interpreter::expr_offset_in_bytes(offset)/wordSize);
 616   return &interpreter_frame_tos_address()[index];
 617 }
 618 
 619 #ifndef PRODUCT
 620 
 621 #define DESCRIBE_FP_OFFSET(name) \
 622   values.describe(frame_no, fp() + frame::name##_offset, #name)
 623 
 624 void frame::describe_pd(FrameValues& values, int frame_no) {
 625   if (is_interpreted_frame()) {
 626     DESCRIBE_FP_OFFSET(interpreter_frame_sender_sp);
 627     DESCRIBE_FP_OFFSET(interpreter_frame_last_sp);
 628     DESCRIBE_FP_OFFSET(interpreter_frame_method);
 629     DESCRIBE_FP_OFFSET(interpreter_frame_mirror);
 630     DESCRIBE_FP_OFFSET(interpreter_frame_mdp);
 631     DESCRIBE_FP_OFFSET(interpreter_frame_cache);
 632     DESCRIBE_FP_OFFSET(interpreter_frame_locals);
 633     DESCRIBE_FP_OFFSET(interpreter_frame_bcp);
 634     DESCRIBE_FP_OFFSET(interpreter_frame_initial_sp);
 635 #ifdef AMD64
 636   } else if (is_entry_frame()) {
 637     // This could be more descriptive if we use the enum in
 638     // stubGenerator to map to real names but it's most important to
 639     // claim these frame slots so the error checking works.
 640     for (int i = 0; i < entry_frame_after_call_words; i++) {
 641       values.describe(frame_no, fp() - i, err_msg("call_stub word fp - %d", i));
 642     }
 643 #endif // AMD64
 644   }
 645 }
 646 #endif // !PRODUCT
 647 
 648 intptr_t *frame::initial_deoptimization_info() {
 649   // used to reset the saved FP
 650   return fp();
 651 }
 652 
 653 intptr_t* frame::real_fp() const {
 654   if (_cb != NULL) {
 655     // use the frame size if valid
 656     int size = _cb->frame_size();
 657     if (size > 0) {
 658       return unextended_sp() + size;
 659     }
 660   }
 661   // else rely on fp()
 662   assert(! is_compiled_frame(), "unknown compiled frame size");
 663   return fp();
 664 }
 665 
 666 #ifndef PRODUCT
 667 // This is a generic constructor which is only used by pns() in debug.cpp.
 668 frame::frame(void* sp, void* fp, void* pc) {
 669   init((intptr_t*)sp, (intptr_t*)fp, (address)pc);
 670 }
 671 #endif
--- EOF ---