1 /*
   2  * Copyright (c) 1997, 2016, 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 "oops/markOop.hpp"
  30 #include "oops/method.hpp"
  31 #include "oops/oop.inline.hpp"
  32 #include "prims/methodHandles.hpp"
  33 #include "runtime/frame.inline.hpp"
  34 #include "runtime/handles.inline.hpp"
  35 #include "runtime/javaCalls.hpp"
  36 #include "runtime/monitorChunk.hpp"
  37 #include "runtime/os.hpp"
  38 #include "runtime/signature.hpp"
  39 #include "runtime/stubCodeGenerator.hpp"
  40 #include "runtime/stubRoutines.hpp"
  41 #include "vmreg_aarch64.inline.hpp"
  42 #ifdef COMPILER1
  43 #include "c1/c1_Runtime1.hpp"
  44 #include "runtime/vframeArray.hpp"
  45 #endif
  46 
  47 #ifdef ASSERT
  48 void RegisterMap::check_location_valid() {
  49 }
  50 #endif
  51 
  52 
  53 // Profiling/safepoint support
  54 
  55 bool frame::safe_for_sender(JavaThread *thread) {
  56   address   sp = (address)_sp;
  57   address   fp = (address)_fp;
  58   address   unextended_sp = (address)_unextended_sp;
  59 
  60   // consider stack guards when trying to determine "safe" stack pointers
  61   static size_t stack_guard_size = os::uses_stack_guard_pages() ?
  62     (JavaThread::stack_red_zone_size() + JavaThread::stack_yellow_zone_size()) : 0;
  63   size_t usable_stack_size = thread->stack_size() - stack_guard_size;
  64 
  65   // sp must be within the usable part of the stack (not in guards)
  66   bool sp_safe = (sp < thread->stack_base()) &&
  67                  (sp >= thread->stack_base() - usable_stack_size);
  68 
  69 
  70   if (!sp_safe) {
  71     return false;
  72   }
  73 
  74   // unextended sp must be within the stack and above or equal sp
  75   bool unextended_sp_safe = (unextended_sp < thread->stack_base()) &&
  76                             (unextended_sp >= sp);
  77 
  78   if (!unextended_sp_safe) {
  79     return false;
  80   }
  81 
  82   // an fp must be within the stack and above (but not equal) sp
  83   // second evaluation on fp+ is added to handle situation where fp is -1
  84   bool fp_safe = (fp < thread->stack_base() && (fp > sp) && (((fp + (return_addr_offset * sizeof(void*))) < thread->stack_base())));
  85 
  86   // We know sp/unextended_sp are safe only fp is questionable here
  87 
  88   // If the current frame is known to the code cache then we can attempt to
  89   // to construct the sender and do some validation of it. This goes a long way
  90   // toward eliminating issues when we get in frame construction code
  91 
  92   if (_cb != NULL ) {
  93 
  94     // First check if frame is complete and tester is reliable
  95     // Unfortunately we can only check frame complete for runtime stubs and nmethod
  96     // other generic buffer blobs are more problematic so we just assume they are
  97     // ok. adapter blobs never have a frame complete and are never ok.
  98 
  99     if (!_cb->is_frame_complete_at(_pc)) {
 100       if (_cb->is_nmethod() || _cb->is_adapter_blob() || _cb->is_runtime_stub()) {
 101         return false;
 102       }
 103     }
 104 
 105     // Could just be some random pointer within the codeBlob
 106     if (!_cb->code_contains(_pc)) {
 107       return false;
 108     }
 109 
 110     // Entry frame checks
 111     if (is_entry_frame()) {
 112       // an entry frame must have a valid fp.
 113 
 114       if (!fp_safe) return false;
 115 
 116       // Validate the JavaCallWrapper an entry frame must have
 117 
 118       address jcw = (address)entry_frame_call_wrapper();
 119 
 120       bool jcw_safe = (jcw < thread->stack_base()) && ( jcw > fp);
 121 
 122       return jcw_safe;
 123 
 124     }
 125 
 126     intptr_t* sender_sp = NULL;
 127     intptr_t* sender_unextended_sp = NULL;
 128     address   sender_pc = NULL;
 129     intptr_t* saved_fp =  NULL;
 130 
 131     if (is_interpreted_frame()) {
 132       // fp must be safe
 133       if (!fp_safe) {
 134         return false;
 135       }
 136 
 137       sender_pc = (address) this->fp()[return_addr_offset];
 138       // for interpreted frames, the value below is the sender "raw" sp,
 139       // which can be different from the sender unextended sp (the sp seen
 140       // by the sender) because of current frame local variables
 141       sender_sp = (intptr_t*) addr_at(sender_sp_offset);
 142       sender_unextended_sp = (intptr_t*) this->fp()[interpreter_frame_sender_sp_offset];
 143       saved_fp = (intptr_t*) this->fp()[link_offset];
 144 
 145     } else {
 146       // must be some sort of compiled/runtime frame
 147       // fp does not have to be safe (although it could be check for c1?)
 148 
 149       // check for a valid frame_size, otherwise we are unlikely to get a valid sender_pc
 150       if (_cb->frame_size() <= 0) {
 151         return false;
 152       }
 153 
 154       sender_sp = _unextended_sp + _cb->frame_size();
 155       sender_unextended_sp = sender_sp;
 156       sender_pc = (address) *(sender_sp-1);
 157       // Note: frame::sender_sp_offset is only valid for compiled frame
 158       saved_fp = (intptr_t*) *(sender_sp - frame::sender_sp_offset);
 159     }
 160 
 161 
 162     // If the potential sender is the interpreter then we can do some more checking
 163     if (Interpreter::contains(sender_pc)) {
 164 
 165       // fp is always saved in a recognizable place in any code we generate. However
 166       // only if the sender is interpreted/call_stub (c1 too?) are we certain that the saved fp
 167       // is really a frame pointer.
 168 
 169       bool saved_fp_safe = ((address)saved_fp < thread->stack_base()) && (saved_fp > sender_sp);
 170 
 171       if (!saved_fp_safe) {
 172         return false;
 173       }
 174 
 175       // construct the potential sender
 176 
 177       frame sender(sender_sp, sender_unextended_sp, saved_fp, sender_pc);
 178 
 179       return sender.is_interpreted_frame_valid(thread);
 180 
 181     }
 182 
 183     // We must always be able to find a recognizable pc
 184     CodeBlob* sender_blob = CodeCache::find_blob_unsafe(sender_pc);
 185     if (sender_pc == NULL ||  sender_blob == NULL) {
 186       return false;
 187     }
 188 
 189     // Could be a zombie method
 190     if (sender_blob->is_zombie() || sender_blob->is_unloaded()) {
 191       return false;
 192     }
 193 
 194     // Could just be some random pointer within the codeBlob
 195     if (!sender_blob->code_contains(sender_pc)) {
 196       return false;
 197     }
 198 
 199     // We should never be able to see an adapter if the current frame is something from code cache
 200     if (sender_blob->is_adapter_blob()) {
 201       return false;
 202     }
 203 
 204     // Could be the call_stub
 205     if (StubRoutines::returns_to_call_stub(sender_pc)) {
 206       bool saved_fp_safe = ((address)saved_fp < thread->stack_base()) && (saved_fp > sender_sp);
 207 
 208       if (!saved_fp_safe) {
 209         return false;
 210       }
 211 
 212       // construct the potential sender
 213 
 214       frame sender(sender_sp, sender_unextended_sp, saved_fp, sender_pc);
 215 
 216       // Validate the JavaCallWrapper an entry frame must have
 217       address jcw = (address)sender.entry_frame_call_wrapper();
 218 
 219       bool jcw_safe = (jcw < thread->stack_base()) && ( jcw > (address)sender.fp());
 220 
 221       return jcw_safe;
 222     }
 223 
 224     CompiledMethod* nm = sender_blob->as_compiled_method_or_null();
 225     if (nm != NULL) {
 226       if (nm->is_deopt_mh_entry(sender_pc) || nm->is_deopt_entry(sender_pc) ||
 227           nm->method()->is_method_handle_intrinsic()) {
 228         return false;
 229       }
 230     }
 231 
 232     // If the frame size is 0 something (or less) is bad because every nmethod has a non-zero frame size
 233     // because the return address counts against the callee's frame.
 234 
 235     if (sender_blob->frame_size() <= 0) {
 236       assert(!sender_blob->is_compiled(), "should count return address at least");
 237       return false;
 238     }
 239 
 240     // We should never be able to see anything here except an nmethod. If something in the
 241     // code cache (current frame) is called by an entity within the code cache that entity
 242     // should not be anything but the call stub (already covered), the interpreter (already covered)
 243     // or an nmethod.
 244 
 245     if (!sender_blob->is_compiled()) {
 246         return false;
 247     }
 248 
 249     // Could put some more validation for the potential non-interpreted sender
 250     // frame we'd create by calling sender if I could think of any. Wait for next crash in forte...
 251 
 252     // One idea is seeing if the sender_pc we have is one that we'd expect to call to current cb
 253 
 254     // We've validated the potential sender that would be created
 255     return true;
 256   }
 257 
 258   // Must be native-compiled frame. Since sender will try and use fp to find
 259   // linkages it must be safe
 260 
 261   if (!fp_safe) {
 262     return false;
 263   }
 264 
 265   // Will the pc we fetch be non-zero (which we'll find at the oldest frame)
 266 
 267   if ( (address) this->fp()[return_addr_offset] == NULL) return false;
 268 
 269 
 270   // could try and do some more potential verification of native frame if we could think of some...
 271 
 272   return true;
 273 
 274 }
 275 
 276 void frame::patch_pc(Thread* thread, address pc) {
 277   address* pc_addr = &(((address*) sp())[-1]);
 278   if (TracePcPatching) {
 279     tty->print_cr("patch_pc at address " INTPTR_FORMAT " [" INTPTR_FORMAT " -> " INTPTR_FORMAT "]",
 280                   p2i(pc_addr), p2i(*pc_addr), p2i(pc));
 281   }
 282   // Either the return address is the original one or we are going to
 283   // patch in the same address that's already there.
 284   assert(_pc == *pc_addr || pc == *pc_addr, "must be");
 285   *pc_addr = pc;
 286   _cb = CodeCache::find_blob(pc);
 287   address original_pc = CompiledMethod::get_deopt_original_pc(this);
 288   if (original_pc != NULL) {
 289     assert(original_pc == _pc, "expected original PC to be stored before patching");
 290     _deopt_state = is_deoptimized;
 291     // leave _pc as is
 292   } else {
 293     _deopt_state = not_deoptimized;
 294     _pc = pc;
 295   }
 296 }
 297 
 298 bool frame::is_interpreted_frame() const  {
 299   return Interpreter::contains(pc());
 300 }
 301 
 302 int frame::frame_size(RegisterMap* map) const {
 303   frame sender = this->sender(map);
 304   return sender.sp() - sp();
 305 }
 306 
 307 intptr_t* frame::entry_frame_argument_at(int offset) const {
 308   // convert offset to index to deal with tsi
 309   int index = (Interpreter::expr_offset_in_bytes(offset)/wordSize);
 310   // Entry frame's arguments are always in relation to unextended_sp()
 311   return &unextended_sp()[index];
 312 }
 313 
 314 // sender_sp
 315 intptr_t* frame::interpreter_frame_sender_sp() const {
 316   assert(is_interpreted_frame(), "interpreted frame expected");
 317   return (intptr_t*) at(interpreter_frame_sender_sp_offset);
 318 }
 319 
 320 void frame::set_interpreter_frame_sender_sp(intptr_t* sender_sp) {
 321   assert(is_interpreted_frame(), "interpreted frame expected");
 322   ptr_at_put(interpreter_frame_sender_sp_offset, (intptr_t) sender_sp);
 323 }
 324 
 325 
 326 // monitor elements
 327 
 328 BasicObjectLock* frame::interpreter_frame_monitor_begin() const {
 329   return (BasicObjectLock*) addr_at(interpreter_frame_monitor_block_bottom_offset);
 330 }
 331 
 332 BasicObjectLock* frame::interpreter_frame_monitor_end() const {
 333   BasicObjectLock* result = (BasicObjectLock*) *addr_at(interpreter_frame_monitor_block_top_offset);
 334   // make sure the pointer points inside the frame
 335   assert(sp() <= (intptr_t*) result, "monitor end should be above the stack pointer");
 336   assert((intptr_t*) result < fp(),  "monitor end should be strictly below the frame pointer");
 337   return result;
 338 }
 339 
 340 void frame::interpreter_frame_set_monitor_end(BasicObjectLock* value) {
 341   *((BasicObjectLock**)addr_at(interpreter_frame_monitor_block_top_offset)) = value;
 342 }
 343 
 344 // Used by template based interpreter deoptimization
 345 void frame::interpreter_frame_set_last_sp(intptr_t* sp) {
 346     *((intptr_t**)addr_at(interpreter_frame_last_sp_offset)) = sp;
 347 }
 348 
 349 frame frame::sender_for_entry_frame(RegisterMap* map) const {
 350   assert(map != NULL, "map must be set");
 351   // Java frame called from C; skip all C frames and return top C
 352   // frame of that chunk as the sender
 353   JavaFrameAnchor* jfa = entry_frame_call_wrapper()->anchor();
 354   assert(!entry_frame_is_first(), "next Java fp must be non zero");
 355   assert(jfa->last_Java_sp() > sp(), "must be above this frame on stack");
 356   map->clear();
 357   assert(map->include_argument_oops(), "should be set by clear");
 358   if (jfa->last_Java_pc() != NULL ) {
 359     frame fr(jfa->last_Java_sp(), jfa->last_Java_fp(), jfa->last_Java_pc());
 360     return fr;
 361   }
 362   frame fr(jfa->last_Java_sp(), jfa->last_Java_fp());
 363   return fr;
 364 }
 365 
 366 //------------------------------------------------------------------------------
 367 // frame::verify_deopt_original_pc
 368 //
 369 // Verifies the calculated original PC of a deoptimization PC for the
 370 // given unextended SP.
 371 #ifdef ASSERT
 372 void frame::verify_deopt_original_pc(CompiledMethod* nm, intptr_t* unextended_sp) {
 373   frame fr;
 374 
 375   // This is ugly but it's better than to change {get,set}_original_pc
 376   // to take an SP value as argument.  And it's only a debugging
 377   // method anyway.
 378   fr._unextended_sp = unextended_sp;
 379 
 380   address original_pc = nm->get_original_pc(&fr);
 381   assert(nm->insts_contains(original_pc), "original PC must be in nmethod");
 382 }
 383 #endif
 384 
 385 //------------------------------------------------------------------------------
 386 // frame::adjust_unextended_sp
 387 void frame::adjust_unextended_sp() {
 388   // On aarch64, sites calling method handle intrinsics and lambda forms are treated
 389   // as any other call site. Therefore, no special action is needed when we are
 390   // returning to any of these call sites.
 391 
 392   if (_cb != NULL) {
 393     CompiledMethod* sender_cm = _cb->as_compiled_method_or_null();
 394     if (sender_cm != NULL) {
 395       // If the sender PC is a deoptimization point, get the original PC.
 396       if (sender_cm->is_deopt_entry(_pc) ||
 397           sender_cm->is_deopt_mh_entry(_pc)) {
 398         DEBUG_ONLY(verify_deopt_original_pc(sender_cm, _unextended_sp));
 399       }
 400     }
 401   }
 402 }
 403 
 404 //------------------------------------------------------------------------------
 405 // frame::update_map_with_saved_link
 406 void frame::update_map_with_saved_link(RegisterMap* map, intptr_t** link_addr) {
 407   // The interpreter and compiler(s) always save fp in a known
 408   // location on entry. We must record where that location is
 409   // so that if fp was live on callout from c2 we can find
 410   // the saved copy no matter what it called.
 411 
 412   // Since the interpreter always saves fp if we record where it is then
 413   // we don't have to always save fp on entry and exit to c2 compiled
 414   // code, on entry will be enough.
 415   map->set_location(rfp->as_VMReg(), (address) link_addr);
 416   // this is weird "H" ought to be at a higher address however the
 417   // oopMaps seems to have the "H" regs at the same address and the
 418   // vanilla register.
 419   // XXXX make this go away
 420   if (true) {
 421     map->set_location(rfp->as_VMReg()->next(), (address) link_addr);
 422   }
 423 }
 424 
 425 
 426 //------------------------------------------------------------------------------
 427 // frame::sender_for_interpreter_frame
 428 frame frame::sender_for_interpreter_frame(RegisterMap* map) const {
 429   // SP is the raw SP from the sender after adapter or interpreter
 430   // extension.
 431   intptr_t* sender_sp = this->sender_sp();
 432 
 433   // This is the sp before any possible extension (adapter/locals).
 434   intptr_t* unextended_sp = interpreter_frame_sender_sp();
 435 
 436 #if defined(COMPILER2) || INCLUDE_JVMCI
 437   if (map->update_map()) {
 438     update_map_with_saved_link(map, (intptr_t**) addr_at(link_offset));
 439   }
 440 #endif // COMPILER2 || INCLUDE_JVMCI
 441 
 442   return frame(sender_sp, unextended_sp, link(), sender_pc());
 443 }
 444 
 445 
 446 //------------------------------------------------------------------------------
 447 // frame::sender_for_compiled_frame
 448 frame frame::sender_for_compiled_frame(RegisterMap* map) const {
 449   // we cannot rely upon the last fp having been saved to the thread
 450   // in C2 code but it will have been pushed onto the stack. so we
 451   // have to find it relative to the unextended sp
 452 
 453   assert(_cb->frame_size() >= 0, "must have non-zero frame size");
 454   intptr_t* l_sender_sp = unextended_sp() + _cb->frame_size();
 455   intptr_t* unextended_sp = l_sender_sp;
 456 
 457   // the return_address is always the word on the stack
 458   address sender_pc = (address) *(l_sender_sp-1);
 459 
 460   intptr_t** saved_fp_addr = (intptr_t**) (l_sender_sp - frame::sender_sp_offset);
 461 
 462   // assert (sender_sp() == l_sender_sp, "should be");
 463   // assert (*saved_fp_addr == link(), "should be");
 464 
 465   if (map->update_map()) {
 466     // Tell GC to use argument oopmaps for some runtime stubs that need it.
 467     // For C1, the runtime stub might not have oop maps, so set this flag
 468     // outside of update_register_map.
 469     map->set_include_argument_oops(_cb->caller_must_gc_arguments(map->thread()));
 470     if (_cb->oop_maps() != NULL) {
 471       OopMapSet::update_register_map(this, map);
 472     }
 473 
 474     // Since the prolog does the save and restore of FP there is no
 475     // oopmap for it so we must fill in its location as if there was
 476     // an oopmap entry since if our caller was compiled code there
 477     // could be live jvm state in it.
 478     update_map_with_saved_link(map, saved_fp_addr);
 479   }
 480 
 481   return frame(l_sender_sp, unextended_sp, *saved_fp_addr, sender_pc);
 482 }
 483 
 484 //------------------------------------------------------------------------------
 485 // frame::sender
 486 frame frame::sender(RegisterMap* map) const {
 487   // Default is we done have to follow them. The sender_for_xxx will
 488   // update it accordingly
 489    map->set_include_argument_oops(false);
 490 
 491   if (is_entry_frame())
 492     return sender_for_entry_frame(map);
 493   if (is_interpreted_frame())
 494     return sender_for_interpreter_frame(map);
 495   assert(_cb == CodeCache::find_blob(pc()),"Must be the same");
 496 
 497   // This test looks odd: why is it not is_compiled_frame() ?  That's
 498   // because stubs also have OOP maps.
 499   if (_cb != NULL) {
 500     return sender_for_compiled_frame(map);
 501   }
 502 
 503   // Must be native-compiled frame, i.e. the marshaling code for native
 504   // methods that exists in the core system.
 505   return frame(sender_sp(), link(), sender_pc());
 506 }
 507 
 508 bool frame::is_interpreted_frame_valid(JavaThread* thread) const {
 509   assert(is_interpreted_frame(), "Not an interpreted frame");
 510   // These are reasonable sanity checks
 511   if (fp() == 0 || (intptr_t(fp()) & (wordSize-1)) != 0) {
 512     return false;
 513   }
 514   if (sp() == 0 || (intptr_t(sp()) & (wordSize-1)) != 0) {
 515     return false;
 516   }
 517   if (fp() + interpreter_frame_initial_sp_offset < sp()) {
 518     return false;
 519   }
 520   // These are hacks to keep us out of trouble.
 521   // The problem with these is that they mask other problems
 522   if (fp() <= sp()) {        // this attempts to deal with unsigned comparison above
 523     return false;
 524   }
 525 
 526   // do some validation of frame elements
 527 
 528   // first the method
 529 
 530   Method* m = *interpreter_frame_method_addr();
 531 
 532   // validate the method we'd find in this potential sender
 533   if (!m->is_valid_method()) return false;
 534 
 535   // stack frames shouldn't be much larger than max_stack elements
 536   // this test requires the use of unextended_sp which is the sp as seen by
 537   // the current frame, and not sp which is the "raw" pc which could point
 538   // further because of local variables of the callee method inserted after
 539   // method arguments
 540   if (fp() - unextended_sp() > 1024 + m->max_stack()*Interpreter::stackElementSize) {
 541     return false;
 542   }
 543 
 544   // validate bci/bcx
 545 
 546   address  bcp    = interpreter_frame_bcp();
 547   if (m->validate_bci_from_bcp(bcp) < 0) {
 548     return false;
 549   }
 550 
 551   // validate constantPoolCache*
 552   ConstantPoolCache* cp = *interpreter_frame_cache_addr();
 553   if (cp == NULL || !cp->is_metaspace_object()) return false;
 554 
 555   // validate locals
 556 
 557   address locals =  (address) *interpreter_frame_locals_addr();
 558 
 559   if (locals > thread->stack_base() || locals < (address) fp()) return false;
 560 
 561   // We'd have to be pretty unlucky to be mislead at this point
 562   return true;
 563 }
 564 
 565 BasicType frame::interpreter_frame_result(oop* oop_result, jvalue* value_result) {
 566   assert(is_interpreted_frame(), "interpreted frame expected");
 567   Method* method = interpreter_frame_method();
 568   BasicType type = method->result_type();
 569 
 570   intptr_t* tos_addr;
 571   if (method->is_native()) {
 572     // TODO : ensure AARCH64 does the same as Intel here i.e. push v0 then r0
 573     // Prior to calling into the runtime to report the method_exit the possible
 574     // return value is pushed to the native stack. If the result is a jfloat/jdouble
 575     // then ST0 is saved before EAX/EDX. See the note in generate_native_result
 576     tos_addr = (intptr_t*)sp();
 577     if (type == T_FLOAT || type == T_DOUBLE) {
 578       // This is times two because we do a push(ltos) after pushing XMM0
 579       // and that takes two interpreter stack slots.
 580       tos_addr += 2 * Interpreter::stackElementWords;
 581     }
 582   } else {
 583     tos_addr = (intptr_t*)interpreter_frame_tos_address();
 584   }
 585 
 586   switch (type) {
 587     case T_OBJECT  :
 588     case T_ARRAY   : {
 589       oop obj;
 590       if (method->is_native()) {
 591         obj = cast_to_oop(at(interpreter_frame_oop_temp_offset));
 592       } else {
 593         oop* obj_p = (oop*)tos_addr;
 594         obj = (obj_p == NULL) ? (oop)NULL : *obj_p;
 595       }
 596       assert(obj == NULL || Universe::heap()->is_in(obj), "sanity check");
 597       *oop_result = obj;
 598       break;
 599     }
 600     case T_BOOLEAN : value_result->z = *(jboolean*)tos_addr; break;
 601     case T_BYTE    : value_result->b = *(jbyte*)tos_addr; break;
 602     case T_CHAR    : value_result->c = *(jchar*)tos_addr; break;
 603     case T_SHORT   : value_result->s = *(jshort*)tos_addr; break;
 604     case T_INT     : value_result->i = *(jint*)tos_addr; break;
 605     case T_LONG    : value_result->j = *(jlong*)tos_addr; break;
 606     case T_FLOAT   : {
 607         value_result->f = *(jfloat*)tos_addr;
 608       break;
 609     }
 610     case T_DOUBLE  : value_result->d = *(jdouble*)tos_addr; break;
 611     case T_VOID    : /* Nothing to do */ break;
 612     default        : ShouldNotReachHere();
 613   }
 614 
 615   return type;
 616 }
 617 
 618 
 619 intptr_t* frame::interpreter_frame_tos_at(jint offset) const {
 620   int index = (Interpreter::expr_offset_in_bytes(offset)/wordSize);
 621   return &interpreter_frame_tos_address()[index];
 622 }
 623 
 624 #ifndef PRODUCT
 625 
 626 #define DESCRIBE_FP_OFFSET(name) \
 627   values.describe(frame_no, fp() + frame::name##_offset, #name)
 628 
 629 void frame::describe_pd(FrameValues& values, int frame_no) {
 630   if (is_interpreted_frame()) {
 631     DESCRIBE_FP_OFFSET(interpreter_frame_sender_sp);
 632     DESCRIBE_FP_OFFSET(interpreter_frame_last_sp);
 633     DESCRIBE_FP_OFFSET(interpreter_frame_method);
 634     DESCRIBE_FP_OFFSET(interpreter_frame_mdp);
 635     DESCRIBE_FP_OFFSET(interpreter_frame_cache);
 636     DESCRIBE_FP_OFFSET(interpreter_frame_locals);
 637     DESCRIBE_FP_OFFSET(interpreter_frame_bcp);
 638     DESCRIBE_FP_OFFSET(interpreter_frame_initial_sp);
 639   }
 640 }
 641 #endif
 642 
 643 intptr_t *frame::initial_deoptimization_info() {
 644   // Not used on aarch64, but we must return something.
 645   return NULL;
 646 }
 647 
 648 intptr_t* frame::real_fp() const {
 649   if (_cb != NULL) {
 650     // use the frame size if valid
 651     int size = _cb->frame_size();
 652     if (size > 0) {
 653       return unextended_sp() + size;
 654     }
 655   }
 656   // else rely on fp()
 657   assert(! is_compiled_frame(), "unknown compiled frame size");
 658   return fp();
 659 }
 660 
 661 #undef DESCRIBE_FP_OFFSET
 662 
 663 #define DESCRIBE_FP_OFFSET(name)                                        \
 664   {                                                                     \
 665     unsigned long *p = (unsigned long *)fp;                             \
 666     printf("0x%016lx 0x%016lx %s\n", (unsigned long)(p + frame::name##_offset), \
 667            p[frame::name##_offset], #name);                             \
 668   }
 669 
 670 static __thread unsigned long nextfp;
 671 static __thread unsigned long nextpc;
 672 static __thread unsigned long nextsp;
 673 static __thread RegisterMap *reg_map;
 674 
 675 static void printbc(Method *m, intptr_t bcx) {
 676   const char *name;
 677   char buf[16];
 678   if (m->validate_bci_from_bcp((address)bcx) < 0
 679       || !m->contains((address)bcx)) {
 680     name = "???";
 681     snprintf(buf, sizeof buf, "(bad)");
 682   } else {
 683     int bci = m->bci_from((address)bcx);
 684     snprintf(buf, sizeof buf, "%d", bci);
 685     name = Bytecodes::name(m->code_at(bci));
 686   }
 687   ResourceMark rm;
 688   printf("%s : %s ==> %s\n", m->name_and_sig_as_C_string(), buf, name);
 689 }
 690 
 691 void internal_pf(unsigned long sp, unsigned long fp, unsigned long pc, unsigned long bcx) {
 692   if (! fp)
 693     return;
 694 
 695   DESCRIBE_FP_OFFSET(return_addr);
 696   DESCRIBE_FP_OFFSET(link);
 697   DESCRIBE_FP_OFFSET(interpreter_frame_sender_sp);
 698   DESCRIBE_FP_OFFSET(interpreter_frame_last_sp);
 699   DESCRIBE_FP_OFFSET(interpreter_frame_method);
 700   DESCRIBE_FP_OFFSET(interpreter_frame_mdp);
 701   DESCRIBE_FP_OFFSET(interpreter_frame_cache);
 702   DESCRIBE_FP_OFFSET(interpreter_frame_locals);
 703   DESCRIBE_FP_OFFSET(interpreter_frame_bcp);
 704   DESCRIBE_FP_OFFSET(interpreter_frame_initial_sp);
 705   unsigned long *p = (unsigned long *)fp;
 706 
 707   // We want to see all frames, native and Java.  For compiled and
 708   // interpreted frames we have special information that allows us to
 709   // unwind them; for everything else we assume that the native frame
 710   // pointer chain is intact.
 711   frame this_frame((intptr_t*)sp, (intptr_t*)fp, (address)pc);
 712   if (this_frame.is_compiled_frame() ||
 713       this_frame.is_interpreted_frame()) {
 714     frame sender = this_frame.sender(reg_map);
 715     nextfp = (unsigned long)sender.fp();
 716     nextpc = (unsigned long)sender.pc();
 717     nextsp = (unsigned long)sender.unextended_sp();
 718   } else {
 719     nextfp = p[frame::link_offset];
 720     nextpc = p[frame::return_addr_offset];
 721     nextsp = (unsigned long)&p[frame::sender_sp_offset];
 722   }
 723 
 724   if (bcx == -1ul)
 725     bcx = p[frame::interpreter_frame_bcp_offset];
 726 
 727   if (Interpreter::contains((address)pc)) {
 728     Method* m = (Method*)p[frame::interpreter_frame_method_offset];
 729     if(m && m->is_method()) {
 730       printbc(m, bcx);
 731     } else
 732       printf("not a Method\n");
 733   } else {
 734     CodeBlob *cb = CodeCache::find_blob((address)pc);
 735     if (cb != NULL) {
 736       if (cb->is_nmethod()) {
 737         ResourceMark rm;
 738         nmethod* nm = (nmethod*)cb;
 739         printf("nmethod %s\n", nm->method()->name_and_sig_as_C_string());
 740       } else if (cb->name()) {
 741         printf("CodeBlob %s\n", cb->name());
 742       }
 743     }
 744   }
 745 }
 746 
 747 extern "C" void npf() {
 748   CodeBlob *cb = CodeCache::find_blob((address)nextpc);
 749   // C2 does not always chain the frame pointers when it can, instead
 750   // preferring to use fixed offsets from SP, so a simple leave() does
 751   // not work.  Instead, it adds the frame size to SP then pops FP and
 752   // LR.  We have to do the same thing to get a good call chain.
 753   if (cb && cb->frame_size())
 754     nextfp = nextsp + wordSize * (cb->frame_size() - 2);
 755   internal_pf (nextsp, nextfp, nextpc, -1);
 756 }
 757 
 758 extern "C" void pf(unsigned long sp, unsigned long fp, unsigned long pc,
 759                    unsigned long bcx, unsigned long thread) {
 760   RegisterMap map((JavaThread*)thread, false);
 761   if (!reg_map) {
 762     reg_map = (RegisterMap*)os::malloc(sizeof map, mtNone);
 763   }
 764   memcpy(reg_map, &map, sizeof map);
 765   {
 766     CodeBlob *cb = CodeCache::find_blob((address)pc);
 767     if (cb && cb->frame_size())
 768       fp = sp + wordSize * (cb->frame_size() - 2);
 769   }
 770   internal_pf(sp, fp, pc, bcx);
 771 }
 772 
 773 // support for printing out where we are in a Java method
 774 // needs to be passed current fp and bcp register values
 775 // prints method name, bc index and bytecode name
 776 extern "C" void pm(unsigned long fp, unsigned long bcx) {
 777   DESCRIBE_FP_OFFSET(interpreter_frame_method);
 778   unsigned long *p = (unsigned long *)fp;
 779   Method* m = (Method*)p[frame::interpreter_frame_method_offset];
 780   printbc(m, bcx);
 781 }
 782 
 783 #ifndef PRODUCT
 784 // This is a generic constructor which is only used by pns() in debug.cpp.
 785 frame::frame(void* sp, void* fp, void* pc) {
 786   init((intptr_t*)sp, (intptr_t*)fp, (address)pc);
 787 }
 788 #endif
--- EOF ---