frame_sparc.cpp revision 3602:da91efe96a93
1/* 2 * Copyright (c) 1997, 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 "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/signature.hpp" 37#include "runtime/stubCodeGenerator.hpp" 38#include "runtime/stubRoutines.hpp" 39#include "vmreg_sparc.inline.hpp" 40#ifdef COMPILER1 41#include "c1/c1_Runtime1.hpp" 42#include "runtime/vframeArray.hpp" 43#endif 44 45void RegisterMap::pd_clear() { 46 if (_thread->has_last_Java_frame()) { 47 frame fr = _thread->last_frame(); 48 _window = fr.sp(); 49 } else { 50 _window = NULL; 51 } 52 _younger_window = NULL; 53} 54 55 56// Unified register numbering scheme: each 32-bits counts as a register 57// number, so all the V9 registers take 2 slots. 58const static int R_L_nums[] = {0+040,2+040,4+040,6+040,8+040,10+040,12+040,14+040}; 59const static int R_I_nums[] = {0+060,2+060,4+060,6+060,8+060,10+060,12+060,14+060}; 60const static int R_O_nums[] = {0+020,2+020,4+020,6+020,8+020,10+020,12+020,14+020}; 61const static int R_G_nums[] = {0+000,2+000,4+000,6+000,8+000,10+000,12+000,14+000}; 62static RegisterMap::LocationValidType bad_mask = 0; 63static RegisterMap::LocationValidType R_LIO_mask = 0; 64static bool register_map_inited = false; 65 66static void register_map_init() { 67 if (!register_map_inited) { 68 register_map_inited = true; 69 int i; 70 for (i = 0; i < 8; i++) { 71 assert(R_L_nums[i] < RegisterMap::location_valid_type_size, "in first chunk"); 72 assert(R_I_nums[i] < RegisterMap::location_valid_type_size, "in first chunk"); 73 assert(R_O_nums[i] < RegisterMap::location_valid_type_size, "in first chunk"); 74 assert(R_G_nums[i] < RegisterMap::location_valid_type_size, "in first chunk"); 75 } 76 77 bad_mask |= (1LL << R_O_nums[6]); // SP 78 bad_mask |= (1LL << R_O_nums[7]); // cPC 79 bad_mask |= (1LL << R_I_nums[6]); // FP 80 bad_mask |= (1LL << R_I_nums[7]); // rPC 81 bad_mask |= (1LL << R_G_nums[2]); // TLS 82 bad_mask |= (1LL << R_G_nums[7]); // reserved by libthread 83 84 for (i = 0; i < 8; i++) { 85 R_LIO_mask |= (1LL << R_L_nums[i]); 86 R_LIO_mask |= (1LL << R_I_nums[i]); 87 R_LIO_mask |= (1LL << R_O_nums[i]); 88 } 89 } 90} 91 92 93address RegisterMap::pd_location(VMReg regname) const { 94 register_map_init(); 95 96 assert(regname->is_reg(), "sanity check"); 97 // Only the GPRs get handled this way 98 if( !regname->is_Register()) 99 return NULL; 100 101 // don't talk about bad registers 102 if ((bad_mask & ((LocationValidType)1 << regname->value())) != 0) { 103 return NULL; 104 } 105 106 // Convert to a GPR 107 Register reg; 108 int second_word = 0; 109 // 32-bit registers for in, out and local 110 if (!regname->is_concrete()) { 111 // HMM ought to return NULL for any non-concrete (odd) vmreg 112 // this all tied up in the fact we put out double oopMaps for 113 // register locations. When that is fixed we'd will return NULL 114 // (or assert here). 115 reg = regname->prev()->as_Register(); 116#ifdef _LP64 117 second_word = sizeof(jint); 118#else 119 return NULL; 120#endif // _LP64 121 } else { 122 reg = regname->as_Register(); 123 } 124 if (reg->is_out()) { 125 assert(_younger_window != NULL, "Younger window should be available"); 126 return second_word + (address)&_younger_window[reg->after_save()->sp_offset_in_saved_window()]; 127 } 128 if (reg->is_local() || reg->is_in()) { 129 assert(_window != NULL, "Window should be available"); 130 return second_word + (address)&_window[reg->sp_offset_in_saved_window()]; 131 } 132 // Only the window'd GPRs get handled this way; not the globals. 133 return NULL; 134} 135 136 137#ifdef ASSERT 138void RegisterMap::check_location_valid() { 139 register_map_init(); 140 assert((_location_valid[0] & bad_mask) == 0, "cannot have special locations for SP,FP,TLS,etc."); 141} 142#endif 143 144// We are shifting windows. That means we are moving all %i to %o, 145// getting rid of all current %l, and keeping all %g. This is only 146// complicated if any of the location pointers for these are valid. 147// The normal case is that everything is in its standard register window 148// home, and _location_valid[0] is zero. In that case, this routine 149// does exactly nothing. 150void RegisterMap::shift_individual_registers() { 151 if (!update_map()) return; // this only applies to maps with locations 152 register_map_init(); 153 check_location_valid(); 154 155 LocationValidType lv = _location_valid[0]; 156 LocationValidType lv0 = lv; 157 158 lv &= ~R_LIO_mask; // clear %l, %o, %i regs 159 160 // if we cleared some non-%g locations, we may have to do some shifting 161 if (lv != lv0) { 162 // copy %i0-%i5 to %o0-%o5, if they have special locations 163 // This can happen in within stubs which spill argument registers 164 // around a dynamic link operation, such as resolve_opt_virtual_call. 165 for (int i = 0; i < 8; i++) { 166 if (lv0 & (1LL << R_I_nums[i])) { 167 _location[R_O_nums[i]] = _location[R_I_nums[i]]; 168 lv |= (1LL << R_O_nums[i]); 169 } 170 } 171 } 172 173 _location_valid[0] = lv; 174 check_location_valid(); 175} 176 177bool frame::safe_for_sender(JavaThread *thread) { 178 179 address _SP = (address) sp(); 180 address _FP = (address) fp(); 181 address _UNEXTENDED_SP = (address) unextended_sp(); 182 // sp must be within the stack 183 bool sp_safe = (_SP <= thread->stack_base()) && 184 (_SP >= thread->stack_base() - thread->stack_size()); 185 186 if (!sp_safe) { 187 return false; 188 } 189 190 // unextended sp must be within the stack and above or equal sp 191 bool unextended_sp_safe = (_UNEXTENDED_SP <= thread->stack_base()) && 192 (_UNEXTENDED_SP >= _SP); 193 194 if (!unextended_sp_safe) return false; 195 196 // an fp must be within the stack and above (but not equal) sp 197 bool fp_safe = (_FP <= thread->stack_base()) && 198 (_FP > _SP); 199 200 // We know sp/unextended_sp are safe only fp is questionable here 201 202 // If the current frame is known to the code cache then we can attempt to 203 // to construct the sender and do some validation of it. This goes a long way 204 // toward eliminating issues when we get in frame construction code 205 206 if (_cb != NULL ) { 207 208 // First check if frame is complete and tester is reliable 209 // Unfortunately we can only check frame complete for runtime stubs and nmethod 210 // other generic buffer blobs are more problematic so we just assume they are 211 // ok. adapter blobs never have a frame complete and are never ok. 212 213 if (!_cb->is_frame_complete_at(_pc)) { 214 if (_cb->is_nmethod() || _cb->is_adapter_blob() || _cb->is_runtime_stub()) { 215 return false; 216 } 217 } 218 219 // Entry frame checks 220 if (is_entry_frame()) { 221 // an entry frame must have a valid fp. 222 223 if (!fp_safe) { 224 return false; 225 } 226 227 // Validate the JavaCallWrapper an entry frame must have 228 229 address jcw = (address)entry_frame_call_wrapper(); 230 231 bool jcw_safe = (jcw <= thread->stack_base()) && ( jcw > _FP); 232 233 return jcw_safe; 234 235 } 236 237 intptr_t* younger_sp = sp(); 238 intptr_t* _SENDER_SP = sender_sp(); // sender is actually just _FP 239 bool adjusted_stack = is_interpreted_frame(); 240 241 address sender_pc = (address)younger_sp[I7->sp_offset_in_saved_window()] + pc_return_offset; 242 243 244 // We must always be able to find a recognizable pc 245 CodeBlob* sender_blob = CodeCache::find_blob_unsafe(sender_pc); 246 if (sender_pc == NULL || sender_blob == NULL) { 247 return false; 248 } 249 250 // It should be safe to construct the sender though it might not be valid 251 252 frame sender(_SENDER_SP, younger_sp, adjusted_stack); 253 254 // Do we have a valid fp? 255 address sender_fp = (address) sender.fp(); 256 257 // an fp must be within the stack and above (but not equal) current frame's _FP 258 259 bool sender_fp_safe = (sender_fp <= thread->stack_base()) && 260 (sender_fp > _FP); 261 262 if (!sender_fp_safe) { 263 return false; 264 } 265 266 267 // If the potential sender is the interpreter then we can do some more checking 268 if (Interpreter::contains(sender_pc)) { 269 return sender.is_interpreted_frame_valid(thread); 270 } 271 272 // Could just be some random pointer within the codeBlob 273 if (!sender.cb()->code_contains(sender_pc)) { 274 return false; 275 } 276 277 // We should never be able to see an adapter if the current frame is something from code cache 278 if (sender_blob->is_adapter_blob()) { 279 return false; 280 } 281 282 if( sender.is_entry_frame()) { 283 // Validate the JavaCallWrapper an entry frame must have 284 285 address jcw = (address)sender.entry_frame_call_wrapper(); 286 287 bool jcw_safe = (jcw <= thread->stack_base()) && ( jcw > sender_fp); 288 289 return jcw_safe; 290 } 291 292 // If the frame size is 0 something is bad because every nmethod has a non-zero frame size 293 // because you must allocate window space 294 295 if (sender_blob->frame_size() == 0) { 296 assert(!sender_blob->is_nmethod(), "should count return address at least"); 297 return false; 298 } 299 300 // The sender should positively be an nmethod or call_stub. On sparc we might in fact see something else. 301 // The cause of this is because at a save instruction the O7 we get is a leftover from an earlier 302 // window use. So if a runtime stub creates two frames (common in fastdebug/jvmg) then we see the 303 // stale pc. So if the sender blob is not something we'd expect we have little choice but to declare 304 // the stack unwalkable. pd_get_top_frame_for_signal_handler tries to recover from this by unwinding 305 // that initial frame and retrying. 306 307 if (!sender_blob->is_nmethod()) { 308 return false; 309 } 310 311 // Could put some more validation for the potential non-interpreted sender 312 // frame we'd create by calling sender if I could think of any. Wait for next crash in forte... 313 314 // One idea is seeing if the sender_pc we have is one that we'd expect to call to current cb 315 316 // We've validated the potential sender that would be created 317 318 return true; 319 320 } 321 322 // Must be native-compiled frame. Since sender will try and use fp to find 323 // linkages it must be safe 324 325 if (!fp_safe) return false; 326 327 // could try and do some more potential verification of native frame if we could think of some... 328 329 return true; 330} 331 332// constructors 333 334// Construct an unpatchable, deficient frame 335frame::frame(intptr_t* sp, unpatchable_t, address pc, CodeBlob* cb) { 336#ifdef _LP64 337 assert( (((intptr_t)sp & (wordSize-1)) == 0), "frame constructor passed an invalid sp"); 338#endif 339 _sp = sp; 340 _younger_sp = NULL; 341 _pc = pc; 342 _cb = cb; 343 _sp_adjustment_by_callee = 0; 344 assert(pc == NULL && cb == NULL || pc != NULL, "can't have a cb and no pc!"); 345 if (_cb == NULL && _pc != NULL ) { 346 _cb = CodeCache::find_blob(_pc); 347 } 348 _deopt_state = unknown; 349#ifdef ASSERT 350 if ( _cb != NULL && _cb->is_nmethod()) { 351 // Without a valid unextended_sp() we can't convert the pc to "original" 352 assert(!((nmethod*)_cb)->is_deopt_pc(_pc), "invariant broken"); 353 } 354#endif // ASSERT 355} 356 357frame::frame(intptr_t* sp, intptr_t* younger_sp, bool younger_frame_is_interpreted) : 358 _sp(sp), 359 _younger_sp(younger_sp), 360 _deopt_state(unknown), 361 _sp_adjustment_by_callee(0) { 362 if (younger_sp == NULL) { 363 // make a deficient frame which doesn't know where its PC is 364 _pc = NULL; 365 _cb = NULL; 366 } else { 367 _pc = (address)younger_sp[I7->sp_offset_in_saved_window()] + pc_return_offset; 368 assert( (intptr_t*)younger_sp[FP->sp_offset_in_saved_window()] == (intptr_t*)((intptr_t)sp - STACK_BIAS), "younger_sp must be valid"); 369 // Any frame we ever build should always "safe" therefore we should not have to call 370 // find_blob_unsafe 371 // In case of native stubs, the pc retrieved here might be 372 // wrong. (the _last_native_pc will have the right value) 373 // So do not put add any asserts on the _pc here. 374 } 375 376 if (_pc != NULL) 377 _cb = CodeCache::find_blob(_pc); 378 379 // Check for MethodHandle call sites. 380 if (_cb != NULL) { 381 nmethod* nm = _cb->as_nmethod_or_null(); 382 if (nm != NULL) { 383 if (nm->is_deopt_mh_entry(_pc) || nm->is_method_handle_return(_pc)) { 384 _sp_adjustment_by_callee = (intptr_t*) ((intptr_t) sp[L7_mh_SP_save->sp_offset_in_saved_window()] + STACK_BIAS) - sp; 385 // The SP is already adjusted by this MH call site, don't 386 // overwrite this value with the wrong interpreter value. 387 younger_frame_is_interpreted = false; 388 } 389 } 390 } 391 392 if (younger_frame_is_interpreted) { 393 // compute adjustment to this frame's SP made by its interpreted callee 394 _sp_adjustment_by_callee = (intptr_t*) ((intptr_t) younger_sp[I5_savedSP->sp_offset_in_saved_window()] + STACK_BIAS) - sp; 395 } 396 397 // It is important that the frame is fully constructed when we do 398 // this lookup as get_deopt_original_pc() needs a correct value for 399 // unextended_sp() which uses _sp_adjustment_by_callee. 400 if (_pc != NULL) { 401 address original_pc = nmethod::get_deopt_original_pc(this); 402 if (original_pc != NULL) { 403 _pc = original_pc; 404 _deopt_state = is_deoptimized; 405 } else { 406 _deopt_state = not_deoptimized; 407 } 408 } 409} 410 411bool frame::is_interpreted_frame() const { 412 return Interpreter::contains(pc()); 413} 414 415// sender_sp 416 417intptr_t* frame::interpreter_frame_sender_sp() const { 418 assert(is_interpreted_frame(), "interpreted frame expected"); 419 return fp(); 420} 421 422#ifndef CC_INTERP 423void frame::set_interpreter_frame_sender_sp(intptr_t* sender_sp) { 424 assert(is_interpreted_frame(), "interpreted frame expected"); 425 Unimplemented(); 426} 427#endif // CC_INTERP 428 429 430#ifdef ASSERT 431// Debugging aid 432static frame nth_sender(int n) { 433 frame f = JavaThread::current()->last_frame(); 434 435 for(int i = 0; i < n; ++i) 436 f = f.sender((RegisterMap*)NULL); 437 438 printf("first frame %d\n", f.is_first_frame() ? 1 : 0); 439 printf("interpreted frame %d\n", f.is_interpreted_frame() ? 1 : 0); 440 printf("java frame %d\n", f.is_java_frame() ? 1 : 0); 441 printf("entry frame %d\n", f.is_entry_frame() ? 1 : 0); 442 printf("native frame %d\n", f.is_native_frame() ? 1 : 0); 443 if (f.is_compiled_frame()) { 444 if (f.is_deoptimized_frame()) 445 printf("deoptimized frame 1\n"); 446 else 447 printf("compiled frame 1\n"); 448 } 449 450 return f; 451} 452#endif 453 454 455frame frame::sender_for_entry_frame(RegisterMap *map) const { 456 assert(map != NULL, "map must be set"); 457 // Java frame called from C; skip all C frames and return top C 458 // frame of that chunk as the sender 459 JavaFrameAnchor* jfa = entry_frame_call_wrapper()->anchor(); 460 assert(!entry_frame_is_first(), "next Java fp must be non zero"); 461 assert(jfa->last_Java_sp() > _sp, "must be above this frame on stack"); 462 intptr_t* last_Java_sp = jfa->last_Java_sp(); 463 // Since we are walking the stack now this nested anchor is obviously walkable 464 // even if it wasn't when it was stacked. 465 if (!jfa->walkable()) { 466 // Capture _last_Java_pc (if needed) and mark anchor walkable. 467 jfa->capture_last_Java_pc(_sp); 468 } 469 assert(jfa->last_Java_pc() != NULL, "No captured pc!"); 470 map->clear(); 471 map->make_integer_regs_unsaved(); 472 map->shift_window(last_Java_sp, NULL); 473 assert(map->include_argument_oops(), "should be set by clear"); 474 return frame(last_Java_sp, frame::unpatchable, jfa->last_Java_pc()); 475} 476 477frame frame::sender_for_interpreter_frame(RegisterMap *map) const { 478 ShouldNotCallThis(); 479 return sender(map); 480} 481 482frame frame::sender_for_compiled_frame(RegisterMap *map) const { 483 ShouldNotCallThis(); 484 return sender(map); 485} 486 487frame frame::sender(RegisterMap* map) const { 488 assert(map != NULL, "map must be set"); 489 490 assert(CodeCache::find_blob_unsafe(_pc) == _cb, "inconsistent"); 491 492 // Default is not to follow arguments; update it accordingly below 493 map->set_include_argument_oops(false); 494 495 if (is_entry_frame()) return sender_for_entry_frame(map); 496 497 intptr_t* younger_sp = sp(); 498 intptr_t* sp = sender_sp(); 499 500 // Note: The version of this operation on any platform with callee-save 501 // registers must update the register map (if not null). 502 // In order to do this correctly, the various subtypes of 503 // of frame (interpreted, compiled, glue, native), 504 // must be distinguished. There is no need on SPARC for 505 // such distinctions, because all callee-save registers are 506 // preserved for all frames via SPARC-specific mechanisms. 507 // 508 // *** HOWEVER, *** if and when we make any floating-point 509 // registers callee-saved, then we will have to copy over 510 // the RegisterMap update logic from the Intel code. 511 512 // The constructor of the sender must know whether this frame is interpreted so it can set the 513 // sender's _sp_adjustment_by_callee field. An osr adapter frame was originally 514 // interpreted but its pc is in the code cache (for c1 -> osr_frame_return_id stub), so it must be 515 // explicitly recognized. 516 517 518 bool frame_is_interpreted = is_interpreted_frame(); 519 if (frame_is_interpreted) { 520 map->make_integer_regs_unsaved(); 521 map->shift_window(sp, younger_sp); 522 } else if (_cb != NULL) { 523 // Update the locations of implicitly saved registers to be their 524 // addresses in the register save area. 525 // For %o registers, the addresses of %i registers in the next younger 526 // frame are used. 527 map->shift_window(sp, younger_sp); 528 if (map->update_map()) { 529 // Tell GC to use argument oopmaps for some runtime stubs that need it. 530 // For C1, the runtime stub might not have oop maps, so set this flag 531 // outside of update_register_map. 532 map->set_include_argument_oops(_cb->caller_must_gc_arguments(map->thread())); 533 if (_cb->oop_maps() != NULL) { 534 OopMapSet::update_register_map(this, map); 535 } 536 } 537 } 538 return frame(sp, younger_sp, frame_is_interpreted); 539} 540 541 542void frame::patch_pc(Thread* thread, address pc) { 543 if(thread == Thread::current()) { 544 StubRoutines::Sparc::flush_callers_register_windows_func()(); 545 } 546 if (TracePcPatching) { 547 // QQQ this assert is invalid (or too strong anyway) sice _pc could 548 // be original pc and frame could have the deopt pc. 549 // assert(_pc == *O7_addr() + pc_return_offset, "frame has wrong pc"); 550 tty->print_cr("patch_pc at address 0x%x [0x%x -> 0x%x] ", O7_addr(), _pc, pc); 551 } 552 _cb = CodeCache::find_blob(pc); 553 *O7_addr() = pc - pc_return_offset; 554 _cb = CodeCache::find_blob(_pc); 555 address original_pc = nmethod::get_deopt_original_pc(this); 556 if (original_pc != NULL) { 557 assert(original_pc == _pc, "expected original to be stored before patching"); 558 _deopt_state = is_deoptimized; 559 } else { 560 _deopt_state = not_deoptimized; 561 } 562} 563 564 565static bool sp_is_valid(intptr_t* old_sp, intptr_t* young_sp, intptr_t* sp) { 566 return (((intptr_t)sp & (2*wordSize-1)) == 0 && 567 sp <= old_sp && 568 sp >= young_sp); 569} 570 571 572/* 573 Find the (biased) sp that is just younger than old_sp starting at sp. 574 If not found return NULL. Register windows are assumed to be flushed. 575*/ 576intptr_t* frame::next_younger_sp_or_null(intptr_t* old_sp, intptr_t* sp) { 577 578 intptr_t* previous_sp = NULL; 579 intptr_t* orig_sp = sp; 580 581 int max_frames = (old_sp - sp) / 16; // Minimum frame size is 16 582 int max_frame2 = max_frames; 583 while(sp != old_sp && sp_is_valid(old_sp, orig_sp, sp)) { 584 if (max_frames-- <= 0) 585 // too many frames have gone by; invalid parameters given to this function 586 break; 587 previous_sp = sp; 588 sp = (intptr_t*)sp[FP->sp_offset_in_saved_window()]; 589 sp = (intptr_t*)((intptr_t)sp + STACK_BIAS); 590 } 591 592 return (sp == old_sp ? previous_sp : NULL); 593} 594 595/* 596 Determine if "sp" is a valid stack pointer. "sp" is assumed to be younger than 597 "valid_sp". So if "sp" is valid itself then it should be possible to walk frames 598 from "sp" to "valid_sp". The assumption is that the registers windows for the 599 thread stack in question are flushed. 600*/ 601bool frame::is_valid_stack_pointer(intptr_t* valid_sp, intptr_t* sp) { 602 return next_younger_sp_or_null(valid_sp, sp) != NULL; 603} 604 605 606bool frame::interpreter_frame_equals_unpacked_fp(intptr_t* fp) { 607 assert(is_interpreted_frame(), "must be interpreter frame"); 608 return this->fp() == fp; 609} 610 611 612void frame::pd_gc_epilog() { 613 if (is_interpreted_frame()) { 614 // set constant pool cache entry for interpreter 615 Method* m = interpreter_frame_method(); 616 617 *interpreter_frame_cpoolcache_addr() = m->constants()->cache(); 618 } 619} 620 621 622bool frame::is_interpreted_frame_valid(JavaThread* thread) const { 623#ifdef CC_INTERP 624 // Is there anything to do? 625#else 626 assert(is_interpreted_frame(), "Not an interpreted frame"); 627 // These are reasonable sanity checks 628 if (fp() == 0 || (intptr_t(fp()) & (2*wordSize-1)) != 0) { 629 return false; 630 } 631 if (sp() == 0 || (intptr_t(sp()) & (2*wordSize-1)) != 0) { 632 return false; 633 } 634 635 const intptr_t interpreter_frame_initial_sp_offset = interpreter_frame_vm_local_words; 636 if (fp() + interpreter_frame_initial_sp_offset < sp()) { 637 return false; 638 } 639 // These are hacks to keep us out of trouble. 640 // The problem with these is that they mask other problems 641 if (fp() <= sp()) { // this attempts to deal with unsigned comparison above 642 return false; 643 } 644 // do some validation of frame elements 645 646 // first the method 647 648 Method* m = *interpreter_frame_method_addr(); 649 650 // validate the method we'd find in this potential sender 651 if (!Universe::heap()->is_valid_method(m)) return false; 652 653 // stack frames shouldn't be much larger than max_stack elements 654 655 if (fp() - sp() > 1024 + m->max_stack()*Interpreter::stackElementSize) { 656 return false; 657 } 658 659 // validate bci/bcx 660 661 intptr_t bcx = interpreter_frame_bcx(); 662 if (m->validate_bci_from_bcx(bcx) < 0) { 663 return false; 664 } 665 666 // validate ConstantPoolCache* 667 ConstantPoolCache* cp = *interpreter_frame_cache_addr(); 668 if (cp == NULL || !cp->is_metadata()) return false; 669 670 // validate locals 671 672 address locals = (address) *interpreter_frame_locals_addr(); 673 674 if (locals > thread->stack_base() || locals < (address) fp()) return false; 675 676 // We'd have to be pretty unlucky to be mislead at this point 677#endif /* CC_INTERP */ 678 return true; 679} 680 681 682// Windows have been flushed on entry (but not marked). Capture the pc that 683// is the return address to the frame that contains "sp" as its stack pointer. 684// This pc resides in the called of the frame corresponding to "sp". 685// As a side effect we mark this JavaFrameAnchor as having flushed the windows. 686// This side effect lets us mark stacked JavaFrameAnchors (stacked in the 687// call_helper) as flushed when we have flushed the windows for the most 688// recent (i.e. current) JavaFrameAnchor. This saves useless flushing calls 689// and lets us find the pc just once rather than multiple times as it did 690// in the bad old _post_Java_state days. 691// 692void JavaFrameAnchor::capture_last_Java_pc(intptr_t* sp) { 693 if (last_Java_sp() != NULL && last_Java_pc() == NULL) { 694 // try and find the sp just younger than _last_Java_sp 695 intptr_t* _post_Java_sp = frame::next_younger_sp_or_null(last_Java_sp(), sp); 696 // Really this should never fail otherwise VM call must have non-standard 697 // frame linkage (bad) or stack is not properly flushed (worse). 698 guarantee(_post_Java_sp != NULL, "bad stack!"); 699 _last_Java_pc = (address) _post_Java_sp[ I7->sp_offset_in_saved_window()] + frame::pc_return_offset; 700 701 } 702 set_window_flushed(); 703} 704 705void JavaFrameAnchor::make_walkable(JavaThread* thread) { 706 if (walkable()) return; 707 // Eventually make an assert 708 guarantee(Thread::current() == (Thread*)thread, "only current thread can flush its registers"); 709 // We always flush in case the profiler wants it but we won't mark 710 // the windows as flushed unless we have a last_Java_frame 711 intptr_t* sp = StubRoutines::Sparc::flush_callers_register_windows_func()(); 712 if (last_Java_sp() != NULL ) { 713 capture_last_Java_pc(sp); 714 } 715} 716 717intptr_t* frame::entry_frame_argument_at(int offset) const { 718 // convert offset to index to deal with tsi 719 int index = (Interpreter::expr_offset_in_bytes(offset)/wordSize); 720 721 intptr_t* LSP = (intptr_t*) sp()[Lentry_args->sp_offset_in_saved_window()]; 722 return &LSP[index+1]; 723} 724 725 726BasicType frame::interpreter_frame_result(oop* oop_result, jvalue* value_result) { 727 assert(is_interpreted_frame(), "interpreted frame expected"); 728 Method* method = interpreter_frame_method(); 729 BasicType type = method->result_type(); 730 731 if (method->is_native()) { 732 // Prior to notifying the runtime of the method_exit the possible result 733 // value is saved to l_scratch and d_scratch. 734 735#ifdef CC_INTERP 736 interpreterState istate = get_interpreterState(); 737 intptr_t* l_scratch = (intptr_t*) &istate->_native_lresult; 738 intptr_t* d_scratch = (intptr_t*) &istate->_native_fresult; 739#else /* CC_INTERP */ 740 intptr_t* l_scratch = fp() + interpreter_frame_l_scratch_fp_offset; 741 intptr_t* d_scratch = fp() + interpreter_frame_d_scratch_fp_offset; 742#endif /* CC_INTERP */ 743 744 address l_addr = (address)l_scratch; 745#ifdef _LP64 746 // On 64-bit the result for 1/8/16/32-bit result types is in the other 747 // word half 748 l_addr += wordSize/2; 749#endif 750 751 switch (type) { 752 case T_OBJECT: 753 case T_ARRAY: { 754#ifdef CC_INTERP 755 *oop_result = istate->_oop_temp; 756#else 757 oop obj = (oop) at(interpreter_frame_oop_temp_offset); 758 assert(obj == NULL || Universe::heap()->is_in(obj), "sanity check"); 759 *oop_result = obj; 760#endif // CC_INTERP 761 break; 762 } 763 764 case T_BOOLEAN : { jint* p = (jint*)l_addr; value_result->z = (jboolean)((*p) & 0x1); break; } 765 case T_BYTE : { jint* p = (jint*)l_addr; value_result->b = (jbyte)((*p) & 0xff); break; } 766 case T_CHAR : { jint* p = (jint*)l_addr; value_result->c = (jchar)((*p) & 0xffff); break; } 767 case T_SHORT : { jint* p = (jint*)l_addr; value_result->s = (jshort)((*p) & 0xffff); break; } 768 case T_INT : value_result->i = *(jint*)l_addr; break; 769 case T_LONG : value_result->j = *(jlong*)l_scratch; break; 770 case T_FLOAT : value_result->f = *(jfloat*)d_scratch; break; 771 case T_DOUBLE : value_result->d = *(jdouble*)d_scratch; break; 772 case T_VOID : /* Nothing to do */ break; 773 default : ShouldNotReachHere(); 774 } 775 } else { 776 intptr_t* tos_addr = interpreter_frame_tos_address(); 777 778 switch(type) { 779 case T_OBJECT: 780 case T_ARRAY: { 781 oop obj = (oop)*tos_addr; 782 assert(obj == NULL || Universe::heap()->is_in(obj), "sanity check"); 783 *oop_result = obj; 784 break; 785 } 786 case T_BOOLEAN : { jint* p = (jint*)tos_addr; value_result->z = (jboolean)((*p) & 0x1); break; } 787 case T_BYTE : { jint* p = (jint*)tos_addr; value_result->b = (jbyte)((*p) & 0xff); break; } 788 case T_CHAR : { jint* p = (jint*)tos_addr; value_result->c = (jchar)((*p) & 0xffff); break; } 789 case T_SHORT : { jint* p = (jint*)tos_addr; value_result->s = (jshort)((*p) & 0xffff); break; } 790 case T_INT : value_result->i = *(jint*)tos_addr; break; 791 case T_LONG : value_result->j = *(jlong*)tos_addr; break; 792 case T_FLOAT : value_result->f = *(jfloat*)tos_addr; break; 793 case T_DOUBLE : value_result->d = *(jdouble*)tos_addr; break; 794 case T_VOID : /* Nothing to do */ break; 795 default : ShouldNotReachHere(); 796 } 797 }; 798 799 return type; 800} 801 802// Lesp pointer is one word lower than the top item on the stack. 803intptr_t* frame::interpreter_frame_tos_at(jint offset) const { 804 int index = (Interpreter::expr_offset_in_bytes(offset)/wordSize) - 1; 805 return &interpreter_frame_tos_address()[index]; 806} 807 808 809#ifndef PRODUCT 810 811#define DESCRIBE_FP_OFFSET(name) \ 812 values.describe(frame_no, fp() + frame::name##_offset, #name) 813 814void frame::describe_pd(FrameValues& values, int frame_no) { 815 for (int w = 0; w < frame::register_save_words; w++) { 816 values.describe(frame_no, sp() + w, err_msg("register save area word %d", w), 1); 817 } 818 819 if (is_interpreted_frame()) { 820 DESCRIBE_FP_OFFSET(interpreter_frame_d_scratch_fp); 821 DESCRIBE_FP_OFFSET(interpreter_frame_l_scratch_fp); 822 DESCRIBE_FP_OFFSET(interpreter_frame_padding); 823 DESCRIBE_FP_OFFSET(interpreter_frame_oop_temp); 824 825 // esp, according to Lesp (e.g. not depending on bci), if seems valid 826 intptr_t* esp = *interpreter_frame_esp_addr(); 827 if ((esp >= sp()) && (esp < fp())) { 828 values.describe(-1, esp, "*Lesp"); 829 } 830 } 831 832 if (!is_compiled_frame()) { 833 if (frame::callee_aggregate_return_pointer_words != 0) { 834 values.describe(frame_no, sp() + frame::callee_aggregate_return_pointer_sp_offset, "callee_aggregate_return_pointer_word"); 835 } 836 for (int w = 0; w < frame::callee_register_argument_save_area_words; w++) { 837 values.describe(frame_no, sp() + frame::callee_register_argument_save_area_sp_offset + w, 838 err_msg("callee_register_argument_save_area_words %d", w)); 839 } 840 } 841} 842 843#endif 844 845intptr_t *frame::initial_deoptimization_info() { 846 // unused... but returns fp() to minimize changes introduced by 7087445 847 return fp(); 848} 849