1 /*
   2  * Copyright (c) 1997, 2018, Oracle and/or its affiliates. All rights reserved.
   3  * Copyright (c) 2014, Red Hat Inc. All rights reserved.
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This code is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License version 2 only, as
   8  * published by the Free Software Foundation.
   9  *
  10  * This code is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  13  * version 2 for more details (a copy is included in the LICENSE file that
  14  * accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License version
  17  * 2 along with this work; if not, write to the Free Software Foundation,
  18  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  19  *
  20  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  21  * or visit www.oracle.com if you need additional information or have any
  22  * questions.
  23  *
  24  */
  25 
  26 #include "precompiled.hpp"
  27 #include "interpreter/interpreter.hpp"
  28 #include "memory/resourceArea.hpp"
  29 #include "memory/universe.hpp"
  30 #include "oops/markOop.hpp"
  31 #include "oops/method.hpp"
  32 #include "oops/oop.inline.hpp"
  33 #include "prims/methodHandles.hpp"
  34 #include "runtime/frame.inline.hpp"
  35 #include "runtime/handles.inline.hpp"
  36 #include "runtime/javaCalls.hpp"
  37 #include "runtime/monitorChunk.hpp"
  38 #include "runtime/os.inline.hpp"
  39 #include "runtime/signature.hpp"
  40 #include "runtime/stubCodeGenerator.hpp"
  41 #include "runtime/stubRoutines.hpp"
  42 #include "vmreg_aarch64.inline.hpp"
  43 #ifdef COMPILER1
  44 #include "c1/c1_Runtime1.hpp"
  45 #include "runtime/vframeArray.hpp"
  46 #endif
  47 
  48 #ifdef ASSERT
  49 void RegisterMap::check_location_valid() {
  50 }
  51 #endif
  52 
  53 
  54 // Profiling/safepoint support
  55 
  56 bool frame::safe_for_sender(JavaThread *thread) {
  57   address   sp = (address)_sp;
  58   address   fp = (address)_fp;
  59   address   unextended_sp = (address)_unextended_sp;
  60 
  61   // consider stack guards when trying to determine "safe" stack pointers
  62   static size_t stack_guard_size = os::uses_stack_guard_pages() ?
  63     (JavaThread::stack_red_zone_size() + JavaThread::stack_yellow_zone_size()) : 0;
  64   size_t usable_stack_size = thread->stack_size() - stack_guard_size;
  65 
  66   // sp must be within the usable part of the stack (not in guards)
  67   bool sp_safe = (sp < thread->stack_base()) &&
  68                  (sp >= thread->stack_base() - usable_stack_size);
  69 
  70 
  71   if (!sp_safe) {
  72     return false;
  73   }
  74 
  75   // When we are running interpreted code the machine stack pointer, SP, is
  76   // set low enough so that the Java expression stack can grow and shrink
  77   // without ever exceeding the machine stack bounds.  So, ESP >= SP.
  78 
  79   // When we call out of an interpreted method, SP is incremented so that
  80   // the space between SP and ESP is removed.  The SP saved in the callee's
  81   // frame is the SP *before* this increment.  So, when we walk a stack of
  82   // interpreter frames the sender's SP saved in a frame might be less than
  83   // the SP at the point of call.
  84 
  85   // So unextended sp must be within the stack but we need not to check
  86   // that unextended sp >= sp
  87 
  88   bool unextended_sp_safe = (unextended_sp < thread->stack_base());
  89 
  90   if (!unextended_sp_safe) {
  91     return false;
  92   }
  93 
  94   // an fp must be within the stack and above (but not equal) sp
  95   // second evaluation on fp+ is added to handle situation where fp is -1
  96   bool fp_safe = (fp < thread->stack_base() && (fp > sp) && (((fp + (return_addr_offset * sizeof(void*))) < thread->stack_base())));
  97 
  98   // We know sp/unextended_sp are safe only fp is questionable here
  99 
 100   // If the current frame is known to the code cache then we can attempt to
 101   // to construct the sender and do some validation of it. This goes a long way
 102   // toward eliminating issues when we get in frame construction code
 103 
 104   if (_cb != NULL ) {
 105 
 106     // First check if frame is complete and tester is reliable
 107     // Unfortunately we can only check frame complete for runtime stubs and nmethod
 108     // other generic buffer blobs are more problematic so we just assume they are
 109     // ok. adapter blobs never have a frame complete and are never ok.
 110 
 111     if (!_cb->is_frame_complete_at(_pc)) {
 112       if (_cb->is_nmethod() || _cb->is_adapter_blob() || _cb->is_runtime_stub()) {
 113         return false;
 114       }
 115     }
 116 
 117     // Could just be some random pointer within the codeBlob
 118     if (!_cb->code_contains(_pc)) {
 119       return false;
 120     }
 121 
 122     // Entry frame checks
 123     if (is_entry_frame()) {
 124       // an entry frame must have a valid fp.
 125       return fp_safe && is_entry_frame_valid(thread);
 126     }
 127 
 128     intptr_t* sender_sp = NULL;
 129     intptr_t* sender_unextended_sp = NULL;
 130     address   sender_pc = NULL;
 131     intptr_t* saved_fp =  NULL;
 132 
 133     if (is_interpreted_frame()) {
 134       // fp must be safe
 135       if (!fp_safe) {
 136         return false;
 137       }
 138 
 139       sender_pc = (address) this->fp()[return_addr_offset];
 140       // for interpreted frames, the value below is the sender "raw" sp,
 141       // which can be different from the sender unextended sp (the sp seen
 142       // by the sender) because of current frame local variables
 143       sender_sp = (intptr_t*) addr_at(sender_sp_offset);
 144       sender_unextended_sp = (intptr_t*) this->fp()[interpreter_frame_sender_sp_offset];
 145       saved_fp = (intptr_t*) this->fp()[link_offset];
 146 
 147     } else {
 148       // must be some sort of compiled/runtime frame
 149       // fp does not have to be safe (although it could be check for c1?)
 150 
 151       // check for a valid frame_size, otherwise we are unlikely to get a valid sender_pc
 152       if (_cb->frame_size() <= 0) {
 153         return false;
 154       }
 155 
 156       sender_sp = _unextended_sp + _cb->frame_size();
 157       // Is sender_sp safe?
 158       if ((address)sender_sp >= thread->stack_base()) {
 159         return false;
 160       }
 161       sender_unextended_sp = sender_sp;
 162       sender_pc = (address) *(sender_sp-1);
 163       // Note: frame::sender_sp_offset is only valid for compiled frame
 164       saved_fp = (intptr_t*) *(sender_sp - frame::sender_sp_offset);
 165     }
 166 
 167 
 168     // If the potential sender is the interpreter then we can do some more checking
 169     if (Interpreter::contains(sender_pc)) {
 170 
 171       // fp is always saved in a recognizable place in any code we generate. However
 172       // only if the sender is interpreted/call_stub (c1 too?) are we certain that the saved fp
 173       // is really a frame pointer.
 174 
 175       bool saved_fp_safe = ((address)saved_fp < thread->stack_base()) && (saved_fp > sender_sp);
 176 
 177       if (!saved_fp_safe) {
 178         return false;
 179       }
 180 
 181       // construct the potential sender
 182 
 183       frame sender(sender_sp, sender_unextended_sp, saved_fp, sender_pc);
 184 
 185       return sender.is_interpreted_frame_valid(thread);
 186 
 187     }
 188 
 189     // We must always be able to find a recognizable pc
 190     CodeBlob* sender_blob = CodeCache::find_blob_unsafe(sender_pc);
 191     if (sender_pc == NULL ||  sender_blob == NULL) {
 192       return false;
 193     }
 194 
 195     // Could be a zombie method
 196     if (sender_blob->is_zombie() || sender_blob->is_unloaded()) {
 197       return false;
 198     }
 199 
 200     // Could just be some random pointer within the codeBlob
 201     if (!sender_blob->code_contains(sender_pc)) {
 202       return false;
 203     }
 204 
 205     // We should never be able to see an adapter if the current frame is something from code cache
 206     if (sender_blob->is_adapter_blob()) {
 207       return false;
 208     }
 209 
 210     // Could be the call_stub
 211     if (StubRoutines::returns_to_call_stub(sender_pc)) {
 212       bool saved_fp_safe = ((address)saved_fp < thread->stack_base()) && (saved_fp > sender_sp);
 213 
 214       if (!saved_fp_safe) {
 215         return false;
 216       }
 217 
 218       // construct the potential sender
 219 
 220       frame sender(sender_sp, sender_unextended_sp, saved_fp, sender_pc);
 221 
 222       // Validate the JavaCallWrapper an entry frame must have
 223       address jcw = (address)sender.entry_frame_call_wrapper();
 224 
 225       bool jcw_safe = (jcw < thread->stack_base()) && (jcw > (address)sender.fp());
 226 
 227       return jcw_safe;
 228     }
 229 
 230     CompiledMethod* nm = sender_blob->as_compiled_method_or_null();
 231     if (nm != NULL) {
 232       if (nm->is_deopt_mh_entry(sender_pc) || nm->is_deopt_entry(sender_pc) ||
 233           nm->method()->is_method_handle_intrinsic()) {
 234         return false;
 235       }
 236     }
 237 
 238     // If the frame size is 0 something (or less) is bad because every nmethod has a non-zero frame size
 239     // because the return address counts against the callee's frame.
 240 
 241     if (sender_blob->frame_size() <= 0) {
 242       assert(!sender_blob->is_compiled(), "should count return address at least");
 243       return false;
 244     }
 245 
 246     // We should never be able to see anything here except an nmethod. If something in the
 247     // code cache (current frame) is called by an entity within the code cache that entity
 248     // should not be anything but the call stub (already covered), the interpreter (already covered)
 249     // or an nmethod.
 250 
 251     if (!sender_blob->is_compiled()) {
 252         return false;
 253     }
 254 
 255     // Could put some more validation for the potential non-interpreted sender
 256     // frame we'd create by calling sender if I could think of any. Wait for next crash in forte...
 257 
 258     // One idea is seeing if the sender_pc we have is one that we'd expect to call to current cb
 259 
 260     // We've validated the potential sender that would be created
 261     return true;
 262   }
 263 
 264   // Must be native-compiled frame. Since sender will try and use fp to find
 265   // linkages it must be safe
 266 
 267   if (!fp_safe) {
 268     return false;
 269   }
 270 
 271   // Will the pc we fetch be non-zero (which we'll find at the oldest frame)
 272 
 273   if ( (address) this->fp()[return_addr_offset] == NULL) return false;
 274 
 275 
 276   // could try and do some more potential verification of native frame if we could think of some...
 277 
 278   return true;
 279 
 280 }
 281 
 282 void frame::patch_pc(Thread* thread, address pc) {
 283   address* pc_addr = &(((address*) sp())[-1]);
 284   if (TracePcPatching) {
 285     tty->print_cr("patch_pc at address " INTPTR_FORMAT " [" INTPTR_FORMAT " -> " INTPTR_FORMAT "]",
 286                   p2i(pc_addr), p2i(*pc_addr), p2i(pc));
 287   }
 288   // Either the return address is the original one or we are going to
 289   // patch in the same address that's already there.
 290   assert(_pc == *pc_addr || pc == *pc_addr, "must be");
 291   *pc_addr = pc;
 292   _cb = CodeCache::find_blob(pc);
 293   address original_pc = CompiledMethod::get_deopt_original_pc(this);
 294   if (original_pc != NULL) {
 295     assert(original_pc == _pc, "expected original PC to be stored before patching");
 296     _deopt_state = is_deoptimized;
 297     // leave _pc as is
 298   } else {
 299     _deopt_state = not_deoptimized;
 300     _pc = pc;
 301   }
 302 }
 303 
 304 bool frame::is_interpreted_frame() const  {
 305   return Interpreter::contains(pc());
 306 }
 307 
 308 int frame::frame_size(RegisterMap* map) const {
 309   frame sender = this->sender(map);
 310   return sender.sp() - sp();
 311 }
 312 
 313 intptr_t* frame::entry_frame_argument_at(int offset) const {
 314   // convert offset to index to deal with tsi
 315   int index = (Interpreter::expr_offset_in_bytes(offset)/wordSize);
 316   // Entry frame's arguments are always in relation to unextended_sp()
 317   return &unextended_sp()[index];
 318 }
 319 
 320 // sender_sp
 321 intptr_t* frame::interpreter_frame_sender_sp() const {
 322   assert(is_interpreted_frame(), "interpreted frame expected");
 323   return (intptr_t*) at(interpreter_frame_sender_sp_offset);
 324 }
 325 
 326 void frame::set_interpreter_frame_sender_sp(intptr_t* sender_sp) {
 327   assert(is_interpreted_frame(), "interpreted frame expected");
 328   ptr_at_put(interpreter_frame_sender_sp_offset, (intptr_t) sender_sp);
 329 }
 330 
 331 
 332 // monitor elements
 333 
 334 BasicObjectLock* frame::interpreter_frame_monitor_begin() const {
 335   return (BasicObjectLock*) addr_at(interpreter_frame_monitor_block_bottom_offset);
 336 }
 337 
 338 BasicObjectLock* frame::interpreter_frame_monitor_end() const {
 339   BasicObjectLock* result = (BasicObjectLock*) *addr_at(interpreter_frame_monitor_block_top_offset);
 340   // make sure the pointer points inside the frame
 341   assert(sp() <= (intptr_t*) result, "monitor end should be above the stack pointer");
 342   assert((intptr_t*) result < fp(),  "monitor end should be strictly below the frame pointer");
 343   return result;
 344 }
 345 
 346 void frame::interpreter_frame_set_monitor_end(BasicObjectLock* value) {
 347   *((BasicObjectLock**)addr_at(interpreter_frame_monitor_block_top_offset)) = value;
 348 }
 349 
 350 // Used by template based interpreter deoptimization
 351 void frame::interpreter_frame_set_last_sp(intptr_t* sp) {
 352     *((intptr_t**)addr_at(interpreter_frame_last_sp_offset)) = sp;
 353 }
 354 
 355 frame frame::sender_for_entry_frame(RegisterMap* map) const {
 356   assert(map != NULL, "map must be set");
 357   // Java frame called from C; skip all C frames and return top C
 358   // frame of that chunk as the sender
 359   JavaFrameAnchor* jfa = entry_frame_call_wrapper()->anchor();
 360   assert(!entry_frame_is_first(), "next Java fp must be non zero");
 361   assert(jfa->last_Java_sp() > sp(), "must be above this frame on stack");
 362   // Since we are walking the stack now this nested anchor is obviously walkable
 363   // even if it wasn't when it was stacked.
 364   if (!jfa->walkable()) {
 365     // Capture _last_Java_pc (if needed) and mark anchor walkable.
 366     jfa->capture_last_Java_pc();
 367   }
 368   map->clear();
 369   assert(map->include_argument_oops(), "should be set by clear");
 370   vmassert(jfa->last_Java_pc() != NULL, "not walkable");
 371   frame fr(jfa->last_Java_sp(), jfa->last_Java_fp(), jfa->last_Java_pc());
 372   return fr;
 373 }
 374 
 375 //------------------------------------------------------------------------------
 376 // frame::verify_deopt_original_pc
 377 //
 378 // Verifies the calculated original PC of a deoptimization PC for the
 379 // given unextended SP.
 380 #ifdef ASSERT
 381 void frame::verify_deopt_original_pc(CompiledMethod* nm, intptr_t* unextended_sp) {
 382   frame fr;
 383 
 384   // This is ugly but it's better than to change {get,set}_original_pc
 385   // to take an SP value as argument.  And it's only a debugging
 386   // method anyway.
 387   fr._unextended_sp = unextended_sp;
 388 
 389   address original_pc = nm->get_original_pc(&fr);
 390   assert(nm->insts_contains_inclusive(original_pc),
 391          "original PC must be in the main code section of the the compiled method (or must be immediately following it)");
 392 }
 393 #endif
 394 
 395 //------------------------------------------------------------------------------
 396 // frame::adjust_unextended_sp
 397 void frame::adjust_unextended_sp() {
 398   // On aarch64, sites calling method handle intrinsics and lambda forms are treated
 399   // as any other call site. Therefore, no special action is needed when we are
 400   // returning to any of these call sites.
 401 
 402   if (_cb != NULL) {
 403     CompiledMethod* sender_cm = _cb->as_compiled_method_or_null();
 404     if (sender_cm != NULL) {
 405       // If the sender PC is a deoptimization point, get the original PC.
 406       if (sender_cm->is_deopt_entry(_pc) ||
 407           sender_cm->is_deopt_mh_entry(_pc)) {
 408         DEBUG_ONLY(verify_deopt_original_pc(sender_cm, _unextended_sp));
 409       }
 410     }
 411   }
 412 }
 413 
 414 //------------------------------------------------------------------------------
 415 // frame::update_map_with_saved_link
 416 void frame::update_map_with_saved_link(RegisterMap* map, intptr_t** link_addr) {
 417   // The interpreter and compiler(s) always save fp in a known
 418   // location on entry. We must record where that location is
 419   // so that if fp was live on callout from c2 we can find
 420   // the saved copy no matter what it called.
 421 
 422   // Since the interpreter always saves fp if we record where it is then
 423   // we don't have to always save fp on entry and exit to c2 compiled
 424   // code, on entry will be enough.
 425   map->set_location(rfp->as_VMReg(), (address) link_addr);
 426   // this is weird "H" ought to be at a higher address however the
 427   // oopMaps seems to have the "H" regs at the same address and the
 428   // vanilla register.
 429   // XXXX make this go away
 430   if (true) {
 431     map->set_location(rfp->as_VMReg()->next(), (address) link_addr);
 432   }
 433 }
 434 
 435 
 436 //------------------------------------------------------------------------------
 437 // frame::sender_for_interpreter_frame
 438 frame frame::sender_for_interpreter_frame(RegisterMap* map) const {
 439   // SP is the raw SP from the sender after adapter or interpreter
 440   // extension.
 441   intptr_t* sender_sp = this->sender_sp();
 442 
 443   // This is the sp before any possible extension (adapter/locals).
 444   intptr_t* unextended_sp = interpreter_frame_sender_sp();
 445 
 446 #if COMPILER2_OR_JVMCI
 447   if (map->update_map()) {
 448     update_map_with_saved_link(map, (intptr_t**) addr_at(link_offset));
 449   }
 450 #endif // COMPILER2_OR_JVMCI
 451 
 452   return frame(sender_sp, unextended_sp, link(), sender_pc());
 453 }
 454 
 455 
 456 //------------------------------------------------------------------------------
 457 // frame::sender_for_compiled_frame
 458 frame frame::sender_for_compiled_frame(RegisterMap* map) const {
 459   // we cannot rely upon the last fp having been saved to the thread
 460   // in C2 code but it will have been pushed onto the stack. so we
 461   // have to find it relative to the unextended sp
 462 
 463   assert(_cb->frame_size() >= 0, "must have non-zero frame size");
 464   intptr_t* l_sender_sp = unextended_sp() + _cb->frame_size();
 465   intptr_t* unextended_sp = l_sender_sp;
 466 
 467   // the return_address is always the word on the stack
 468   address sender_pc = (address) *(l_sender_sp-1);
 469 
 470   intptr_t** saved_fp_addr = (intptr_t**) (l_sender_sp - frame::sender_sp_offset);
 471 
 472   // assert (sender_sp() == l_sender_sp, "should be");
 473   // assert (*saved_fp_addr == link(), "should be");
 474 
 475   if (map->update_map()) {
 476     // Tell GC to use argument oopmaps for some runtime stubs that need it.
 477     // For C1, the runtime stub might not have oop maps, so set this flag
 478     // outside of update_register_map.
 479     map->set_include_argument_oops(_cb->caller_must_gc_arguments(map->thread()));
 480     if (_cb->oop_maps() != NULL) {
 481       OopMapSet::update_register_map(this, map);
 482     }
 483 
 484     // Since the prolog does the save and restore of FP there is no
 485     // oopmap for it so we must fill in its location as if there was
 486     // an oopmap entry since if our caller was compiled code there
 487     // could be live jvm state in it.
 488     update_map_with_saved_link(map, saved_fp_addr);
 489   }
 490 
 491   return frame(l_sender_sp, unextended_sp, *saved_fp_addr, sender_pc);
 492 }
 493 
 494 //------------------------------------------------------------------------------
 495 // frame::sender
 496 frame frame::sender(RegisterMap* map) const {
 497   // Default is we done have to follow them. The sender_for_xxx will
 498   // update it accordingly
 499    map->set_include_argument_oops(false);
 500 
 501   if (is_entry_frame())
 502     return sender_for_entry_frame(map);
 503   if (is_interpreted_frame())
 504     return sender_for_interpreter_frame(map);
 505   assert(_cb == CodeCache::find_blob(pc()),"Must be the same");
 506 
 507   // This test looks odd: why is it not is_compiled_frame() ?  That's
 508   // because stubs also have OOP maps.
 509   if (_cb != NULL) {
 510     return sender_for_compiled_frame(map);
 511   }
 512 
 513   // Must be native-compiled frame, i.e. the marshaling code for native
 514   // methods that exists in the core system.
 515   return frame(sender_sp(), link(), sender_pc());
 516 }
 517 
 518 bool frame::is_interpreted_frame_valid(JavaThread* thread) const {
 519   assert(is_interpreted_frame(), "Not an interpreted frame");
 520   // These are reasonable sanity checks
 521   if (fp() == 0 || (intptr_t(fp()) & (wordSize-1)) != 0) {
 522     return false;
 523   }
 524   if (sp() == 0 || (intptr_t(sp()) & (wordSize-1)) != 0) {
 525     return false;
 526   }
 527   if (fp() + interpreter_frame_initial_sp_offset < sp()) {
 528     return false;
 529   }
 530   // These are hacks to keep us out of trouble.
 531   // The problem with these is that they mask other problems
 532   if (fp() <= sp()) {        // this attempts to deal with unsigned comparison above
 533     return false;
 534   }
 535 
 536   // do some validation of frame elements
 537 
 538   // first the method
 539 
 540   Method* m = *interpreter_frame_method_addr();
 541 
 542   // validate the method we'd find in this potential sender
 543   if (!Method::is_valid_method(m)) return false;
 544 
 545   // stack frames shouldn't be much larger than max_stack elements
 546   // this test requires the use of unextended_sp which is the sp as seen by
 547   // the current frame, and not sp which is the "raw" pc which could point
 548   // further because of local variables of the callee method inserted after
 549   // method arguments
 550   if (fp() - unextended_sp() > 1024 + m->max_stack()*Interpreter::stackElementSize) {
 551     return false;
 552   }
 553 
 554   // validate bci/bcx
 555 
 556   address  bcp    = interpreter_frame_bcp();
 557   if (m->validate_bci_from_bcp(bcp) < 0) {
 558     return false;
 559   }
 560 
 561   // validate constantPoolCache*
 562   ConstantPoolCache* cp = *interpreter_frame_cache_addr();
 563   if (MetaspaceObj::is_valid(cp) == false) return false;
 564 
 565   // validate locals
 566 
 567   address locals =  (address) *interpreter_frame_locals_addr();
 568 
 569   if (locals > thread->stack_base() || locals < (address) fp()) return false;
 570 
 571   // We'd have to be pretty unlucky to be mislead at this point
 572   return true;
 573 }
 574 
 575 BasicType frame::interpreter_frame_result(oop* oop_result, jvalue* value_result) {
 576   assert(is_interpreted_frame(), "interpreted frame expected");
 577   Method* method = interpreter_frame_method();
 578   BasicType type = method->result_type();
 579 
 580   intptr_t* tos_addr;
 581   if (method->is_native()) {
 582     // TODO : ensure AARCH64 does the same as Intel here i.e. push v0 then r0
 583     // Prior to calling into the runtime to report the method_exit the possible
 584     // return value is pushed to the native stack. If the result is a jfloat/jdouble
 585     // then ST0 is saved before EAX/EDX. See the note in generate_native_result
 586     tos_addr = (intptr_t*)sp();
 587     if (type == T_FLOAT || type == T_DOUBLE) {
 588       // This is times two because we do a push(ltos) after pushing XMM0
 589       // and that takes two interpreter stack slots.
 590       tos_addr += 2 * Interpreter::stackElementWords;
 591     }
 592   } else {
 593     tos_addr = (intptr_t*)interpreter_frame_tos_address();
 594   }
 595 
 596   switch (type) {
 597     case T_OBJECT  :
 598     case T_ARRAY   : {
 599       oop obj;
 600       if (method->is_native()) {
 601         obj = cast_to_oop(at(interpreter_frame_oop_temp_offset));
 602       } else {
 603         oop* obj_p = (oop*)tos_addr;
 604         obj = (obj_p == NULL) ? (oop)NULL : *obj_p;
 605       }
 606       assert(obj == NULL || Universe::heap()->is_in(obj), "sanity check");
 607       *oop_result = obj;
 608       break;
 609     }
 610     case T_BOOLEAN : value_result->z = *(jboolean*)tos_addr; break;
 611     case T_BYTE    : value_result->b = *(jbyte*)tos_addr; break;
 612     case T_CHAR    : value_result->c = *(jchar*)tos_addr; break;
 613     case T_SHORT   : value_result->s = *(jshort*)tos_addr; break;
 614     case T_INT     : value_result->i = *(jint*)tos_addr; break;
 615     case T_LONG    : value_result->j = *(jlong*)tos_addr; break;
 616     case T_FLOAT   : {
 617         value_result->f = *(jfloat*)tos_addr;
 618       break;
 619     }
 620     case T_DOUBLE  : value_result->d = *(jdouble*)tos_addr; break;
 621     case T_VOID    : /* Nothing to do */ break;
 622     default        : ShouldNotReachHere();
 623   }
 624 
 625   return type;
 626 }
 627 
 628 
 629 intptr_t* frame::interpreter_frame_tos_at(jint offset) const {
 630   int index = (Interpreter::expr_offset_in_bytes(offset)/wordSize);
 631   return &interpreter_frame_tos_address()[index];
 632 }
 633 
 634 #ifndef PRODUCT
 635 
 636 #define DESCRIBE_FP_OFFSET(name) \
 637   values.describe(frame_no, fp() + frame::name##_offset, #name)
 638 
 639 void frame::describe_pd(FrameValues& values, int frame_no) {
 640   if (is_interpreted_frame()) {
 641     DESCRIBE_FP_OFFSET(interpreter_frame_sender_sp);
 642     DESCRIBE_FP_OFFSET(interpreter_frame_last_sp);
 643     DESCRIBE_FP_OFFSET(interpreter_frame_method);
 644     DESCRIBE_FP_OFFSET(interpreter_frame_mdp);
 645     DESCRIBE_FP_OFFSET(interpreter_frame_mirror);
 646     DESCRIBE_FP_OFFSET(interpreter_frame_cache);
 647     DESCRIBE_FP_OFFSET(interpreter_frame_locals);
 648     DESCRIBE_FP_OFFSET(interpreter_frame_bcp);
 649     DESCRIBE_FP_OFFSET(interpreter_frame_initial_sp);
 650   }
 651 }
 652 #endif
 653 
 654 intptr_t *frame::initial_deoptimization_info() {
 655   // Not used on aarch64, but we must return something.
 656   return NULL;
 657 }
 658 
 659 intptr_t* frame::real_fp() const {
 660   if (_cb != NULL) {
 661     // use the frame size if valid
 662     int size = _cb->frame_size();
 663     if (size > 0) {
 664       return unextended_sp() + size;
 665     }
 666   }
 667   // else rely on fp()
 668   assert(! is_compiled_frame(), "unknown compiled frame size");
 669   return fp();
 670 }
 671 
 672 #undef DESCRIBE_FP_OFFSET
 673 
 674 #define DESCRIBE_FP_OFFSET(name)                                        \
 675   {                                                                     \
 676     unsigned long *p = (unsigned long *)fp;                             \
 677     printf("0x%016lx 0x%016lx %s\n", (unsigned long)(p + frame::name##_offset), \
 678            p[frame::name##_offset], #name);                             \
 679   }
 680 
 681 static __thread unsigned long nextfp;
 682 static __thread unsigned long nextpc;
 683 static __thread unsigned long nextsp;
 684 static __thread RegisterMap *reg_map;
 685 
 686 static void printbc(Method *m, intptr_t bcx) {
 687   const char *name;
 688   char buf[16];
 689   if (m->validate_bci_from_bcp((address)bcx) < 0
 690       || !m->contains((address)bcx)) {
 691     name = "???";
 692     snprintf(buf, sizeof buf, "(bad)");
 693   } else {
 694     int bci = m->bci_from((address)bcx);
 695     snprintf(buf, sizeof buf, "%d", bci);
 696     name = Bytecodes::name(m->code_at(bci));
 697   }
 698   ResourceMark rm;
 699   printf("%s : %s ==> %s\n", m->name_and_sig_as_C_string(), buf, name);
 700 }
 701 
 702 void internal_pf(unsigned long sp, unsigned long fp, unsigned long pc, unsigned long bcx) {
 703   if (! fp)
 704     return;
 705 
 706   DESCRIBE_FP_OFFSET(return_addr);
 707   DESCRIBE_FP_OFFSET(link);
 708   DESCRIBE_FP_OFFSET(interpreter_frame_sender_sp);
 709   DESCRIBE_FP_OFFSET(interpreter_frame_last_sp);
 710   DESCRIBE_FP_OFFSET(interpreter_frame_method);
 711   DESCRIBE_FP_OFFSET(interpreter_frame_mdp);
 712   DESCRIBE_FP_OFFSET(interpreter_frame_cache);
 713   DESCRIBE_FP_OFFSET(interpreter_frame_locals);
 714   DESCRIBE_FP_OFFSET(interpreter_frame_bcp);
 715   DESCRIBE_FP_OFFSET(interpreter_frame_initial_sp);
 716   unsigned long *p = (unsigned long *)fp;
 717 
 718   // We want to see all frames, native and Java.  For compiled and
 719   // interpreted frames we have special information that allows us to
 720   // unwind them; for everything else we assume that the native frame
 721   // pointer chain is intact.
 722   frame this_frame((intptr_t*)sp, (intptr_t*)fp, (address)pc);
 723   if (this_frame.is_compiled_frame() ||
 724       this_frame.is_interpreted_frame()) {
 725     frame sender = this_frame.sender(reg_map);
 726     nextfp = (unsigned long)sender.fp();
 727     nextpc = (unsigned long)sender.pc();
 728     nextsp = (unsigned long)sender.unextended_sp();
 729   } else {
 730     nextfp = p[frame::link_offset];
 731     nextpc = p[frame::return_addr_offset];
 732     nextsp = (unsigned long)&p[frame::sender_sp_offset];
 733   }
 734 
 735   if (bcx == -1ul)
 736     bcx = p[frame::interpreter_frame_bcp_offset];
 737 
 738   if (Interpreter::contains((address)pc)) {
 739     Method* m = (Method*)p[frame::interpreter_frame_method_offset];
 740     if(m && m->is_method()) {
 741       printbc(m, bcx);
 742     } else
 743       printf("not a Method\n");
 744   } else {
 745     CodeBlob *cb = CodeCache::find_blob((address)pc);
 746     if (cb != NULL) {
 747       if (cb->is_nmethod()) {
 748         ResourceMark rm;
 749         nmethod* nm = (nmethod*)cb;
 750         printf("nmethod %s\n", nm->method()->name_and_sig_as_C_string());
 751       } else if (cb->name()) {
 752         printf("CodeBlob %s\n", cb->name());
 753       }
 754     }
 755   }
 756 }
 757 
 758 extern "C" void npf() {
 759   CodeBlob *cb = CodeCache::find_blob((address)nextpc);
 760   // C2 does not always chain the frame pointers when it can, instead
 761   // preferring to use fixed offsets from SP, so a simple leave() does
 762   // not work.  Instead, it adds the frame size to SP then pops FP and
 763   // LR.  We have to do the same thing to get a good call chain.
 764   if (cb && cb->frame_size())
 765     nextfp = nextsp + wordSize * (cb->frame_size() - 2);
 766   internal_pf (nextsp, nextfp, nextpc, -1);
 767 }
 768 
 769 extern "C" void pf(unsigned long sp, unsigned long fp, unsigned long pc,
 770                    unsigned long bcx, unsigned long thread) {
 771   RegisterMap map((JavaThread*)thread, false);
 772   if (!reg_map) {
 773     reg_map = (RegisterMap*)os::malloc(sizeof map, mtNone);
 774   }
 775   memcpy(reg_map, &map, sizeof map);
 776   {
 777     CodeBlob *cb = CodeCache::find_blob((address)pc);
 778     if (cb && cb->frame_size())
 779       fp = sp + wordSize * (cb->frame_size() - 2);
 780   }
 781   internal_pf(sp, fp, pc, bcx);
 782 }
 783 
 784 // support for printing out where we are in a Java method
 785 // needs to be passed current fp and bcp register values
 786 // prints method name, bc index and bytecode name
 787 extern "C" void pm(unsigned long fp, unsigned long bcx) {
 788   DESCRIBE_FP_OFFSET(interpreter_frame_method);
 789   unsigned long *p = (unsigned long *)fp;
 790   Method* m = (Method*)p[frame::interpreter_frame_method_offset];
 791   printbc(m, bcx);
 792 }
 793 
 794 #ifndef PRODUCT
 795 // This is a generic constructor which is only used by pns() in debug.cpp.
 796 frame::frame(void* sp, void* fp, void* pc) {
 797   init((intptr_t*)sp, (intptr_t*)fp, (address)pc);
 798 }
 799 
 800 void frame::pd_ps() {}
 801 #endif
 802 
 803 void JavaFrameAnchor::make_walkable(JavaThread* thread) {
 804   // last frame set?
 805   if (last_Java_sp() == NULL) return;
 806   // already walkable?
 807   if (walkable()) return;
 808   vmassert(Thread::current() == (Thread*)thread, "not current thread");
 809   vmassert(last_Java_sp() != NULL, "not called from Java code?");
 810   vmassert(last_Java_pc() == NULL, "already walkable");
 811   capture_last_Java_pc();
 812   vmassert(walkable(), "something went wrong");
 813 }
 814 
 815 void JavaFrameAnchor::capture_last_Java_pc() {
 816   vmassert(_last_Java_sp != NULL, "no last frame set");
 817   vmassert(_last_Java_pc == NULL, "already walkable");
 818   _last_Java_pc = (address)_last_Java_sp[-1];
 819 }