1 /*
2 * Copyright (c) 1999, 2021, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2014, 2021, 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 "asm/assembler.hpp"
28 #include "c1/c1_CodeStubs.hpp"
29 #include "c1/c1_Defs.hpp"
30 #include "c1/c1_MacroAssembler.hpp"
31 #include "c1/c1_Runtime1.hpp"
32 #include "compiler/disassembler.hpp"
33 #include "compiler/oopMap.hpp"
34 #include "gc/shared/cardTable.hpp"
35 #include "gc/shared/cardTableBarrierSet.hpp"
36 #include "gc/shared/collectedHeap.hpp"
37 #include "gc/shared/tlab_globals.hpp"
38 #include "interpreter/interpreter.hpp"
39 #include "memory/universe.hpp"
40 #include "nativeInst_aarch64.hpp"
41 #include "oops/compiledICHolder.hpp"
42 #include "oops/oop.inline.hpp"
43 #include "prims/jvmtiExport.hpp"
44 #include "register_aarch64.hpp"
45 #include "runtime/sharedRuntime.hpp"
46 #include "runtime/signature.hpp"
47 #include "runtime/stubRoutines.hpp"
48 #include "runtime/vframe.hpp"
49 #include "runtime/vframeArray.hpp"
50 #include "utilities/powerOfTwo.hpp"
51 #include "vmreg_aarch64.inline.hpp"
52
53
54 // Implementation of StubAssembler
55
56 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry, int args_size) {
57 // setup registers
58 assert(!(oop_result1->is_valid() || metadata_result->is_valid()) || oop_result1 != metadata_result, "registers must be different");
59 assert(oop_result1 != rthread && metadata_result != rthread, "registers must be different");
60 assert(args_size >= 0, "illegal args_size");
61 bool align_stack = false;
62
63 mov(c_rarg0, rthread);
64 set_num_rt_args(0); // Nothing on stack
65
66 Label retaddr;
67 set_last_Java_frame(sp, rfp, retaddr, rscratch1);
68
69 // do the call
70 lea(rscratch1, RuntimeAddress(entry));
71 blr(rscratch1);
72 bind(retaddr);
73 int call_offset = offset();
74 // verify callee-saved register
75 #ifdef ASSERT
76 push(r0, sp);
77 { Label L;
78 get_thread(r0);
79 cmp(rthread, r0);
80 br(Assembler::EQ, L);
81 stop("StubAssembler::call_RT: rthread not callee saved?");
82 bind(L);
83 }
84 pop(r0, sp);
85 #endif
86 reset_last_Java_frame(true);
87
88 // check for pending exceptions
89 { Label L;
90 // check for pending exceptions (java_thread is set upon return)
91 ldr(rscratch1, Address(rthread, in_bytes(Thread::pending_exception_offset())));
92 cbz(rscratch1, L);
93 // exception pending => remove activation and forward to exception handler
94 // make sure that the vm_results are cleared
95 if (oop_result1->is_valid()) {
96 str(zr, Address(rthread, JavaThread::vm_result_offset()));
97 }
98 if (metadata_result->is_valid()) {
99 str(zr, Address(rthread, JavaThread::vm_result_2_offset()));
100 }
101 if (frame_size() == no_frame_size) {
102 leave();
103 far_jump(RuntimeAddress(StubRoutines::forward_exception_entry()));
104 } else if (_stub_id == Runtime1::forward_exception_id) {
105 should_not_reach_here();
106 } else {
107 far_jump(RuntimeAddress(Runtime1::entry_for(Runtime1::forward_exception_id)));
108 }
109 bind(L);
110 }
111 // get oop results if there are any and reset the values in the thread
112 if (oop_result1->is_valid()) {
113 get_vm_result(oop_result1, rthread);
114 }
115 if (metadata_result->is_valid()) {
116 get_vm_result_2(metadata_result, rthread);
117 }
118 return call_offset;
119 }
120
121
122 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry, Register arg1) {
123 mov(c_rarg1, arg1);
124 return call_RT(oop_result1, metadata_result, entry, 1);
125 }
126
127
128 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry, Register arg1, Register arg2) {
129 if (c_rarg1 == arg2) {
130 if (c_rarg2 == arg1) {
131 mov(rscratch1, arg1);
132 mov(arg1, arg2);
133 mov(arg2, rscratch1);
134 } else {
135 mov(c_rarg2, arg2);
136 mov(c_rarg1, arg1);
137 }
138 } else {
139 mov(c_rarg1, arg1);
140 mov(c_rarg2, arg2);
141 }
142 return call_RT(oop_result1, metadata_result, entry, 2);
143 }
144
145
146 int StubAssembler::call_RT(Register oop_result1, Register metadata_result, address entry, Register arg1, Register arg2, Register arg3) {
147 // if there is any conflict use the stack
148 if (arg1 == c_rarg2 || arg1 == c_rarg3 ||
149 arg2 == c_rarg1 || arg2 == c_rarg3 ||
150 arg3 == c_rarg1 || arg3 == c_rarg2) {
151 stp(arg3, arg2, Address(pre(sp, -2 * wordSize)));
152 stp(arg1, zr, Address(pre(sp, -2 * wordSize)));
153 ldp(c_rarg1, zr, Address(post(sp, 2 * wordSize)));
154 ldp(c_rarg3, c_rarg2, Address(post(sp, 2 * wordSize)));
155 } else {
156 mov(c_rarg1, arg1);
157 mov(c_rarg2, arg2);
158 mov(c_rarg3, arg3);
159 }
160 return call_RT(oop_result1, metadata_result, entry, 3);
161 }
162
163 enum return_state_t {
164 does_not_return, requires_return
165 };
166
167
168 // Implementation of StubFrame
169
170 class StubFrame: public StackObj {
171 private:
172 StubAssembler* _sasm;
173 bool _return_state;
174
175 public:
176 StubFrame(StubAssembler* sasm, const char* name, bool must_gc_arguments, return_state_t return_state=requires_return);
177 void load_argument(int offset_in_words, Register reg);
178
179 ~StubFrame();
180 };;
181
182 void StubAssembler::prologue(const char* name, bool must_gc_arguments) {
183 set_info(name, must_gc_arguments);
184 enter();
185 }
186
187 void StubAssembler::epilogue() {
188 leave();
189 ret(lr);
190 }
191
192 #define __ _sasm->
193
194 StubFrame::StubFrame(StubAssembler* sasm, const char* name, bool must_gc_arguments, return_state_t return_state) {
195 _sasm = sasm;
196 _return_state = return_state;
197 __ prologue(name, must_gc_arguments);
198 }
199
200 // load parameters that were stored with LIR_Assembler::store_parameter
201 // Note: offsets for store_parameter and load_argument must match
202 void StubFrame::load_argument(int offset_in_words, Register reg) {
203 __ load_parameter(offset_in_words, reg);
204 }
205
206 StubFrame::~StubFrame() {
207 if (_return_state == requires_return) {
208 __ epilogue();
209 } else {
210 __ should_not_reach_here();
211 }
212 }
213
214 #undef __
215
216
217 // Implementation of Runtime1
218
219 #define __ sasm->
220
221 const int float_regs_as_doubles_size_in_slots = pd_nof_fpu_regs_frame_map * 2;
222
223 // Stack layout for saving/restoring all the registers needed during a runtime
224 // call (this includes deoptimization)
225 // Note: note that users of this frame may well have arguments to some runtime
226 // while these values are on the stack. These positions neglect those arguments
227 // but the code in save_live_registers will take the argument count into
228 // account.
229 //
230
231 enum reg_save_layout {
232 reg_save_frame_size = 32 /* float */ + 32 /* integer */
233 };
234
235 // Save off registers which might be killed by calls into the runtime.
236 // Tries to smart of about FP registers. In particular we separate
237 // saving and describing the FPU registers for deoptimization since we
238 // have to save the FPU registers twice if we describe them. The
239 // deopt blob is the only thing which needs to describe FPU registers.
240 // In all other cases it should be sufficient to simply save their
241 // current value.
242
243 static int cpu_reg_save_offsets[FrameMap::nof_cpu_regs];
244 static int fpu_reg_save_offsets[FrameMap::nof_fpu_regs];
245 static int reg_save_size_in_words;
246 static int frame_size_in_bytes = -1;
247
248 static OopMap* generate_oop_map(StubAssembler* sasm, bool save_fpu_registers) {
249 int frame_size_in_bytes = reg_save_frame_size * BytesPerWord;
250 sasm->set_frame_size(frame_size_in_bytes / BytesPerWord);
251 int frame_size_in_slots = frame_size_in_bytes / sizeof(jint);
252 OopMap* oop_map = new OopMap(frame_size_in_slots, 0);
253
254 for (int i = 0; i < FrameMap::nof_cpu_regs; i++) {
255 Register r = as_Register(i);
256 if (i <= 18 && i != rscratch1->encoding() && i != rscratch2->encoding()) {
257 int sp_offset = cpu_reg_save_offsets[i];
258 oop_map->set_callee_saved(VMRegImpl::stack2reg(sp_offset),
259 r->as_VMReg());
260 }
261 }
262
263 if (save_fpu_registers) {
264 for (int i = 0; i < FrameMap::nof_fpu_regs; i++) {
265 FloatRegister r = as_FloatRegister(i);
266 {
267 int sp_offset = fpu_reg_save_offsets[i];
268 oop_map->set_callee_saved(VMRegImpl::stack2reg(sp_offset),
269 r->as_VMReg());
270 }
271 }
272 }
273 return oop_map;
274 }
275
276 static OopMap* save_live_registers(StubAssembler* sasm,
277 bool save_fpu_registers = true) {
278 __ block_comment("save_live_registers");
279
280 __ push(RegSet::range(r0, r29), sp); // integer registers except lr & sp
281
282 if (save_fpu_registers) {
283 for (int i = 31; i>= 0; i -= 4) {
284 __ sub(sp, sp, 4 * wordSize); // no pre-increment for st1. Emulate it without modifying other registers
285 __ st1(as_FloatRegister(i-3), as_FloatRegister(i-2), as_FloatRegister(i-1),
286 as_FloatRegister(i), __ T1D, Address(sp));
287 }
288 } else {
289 __ add(sp, sp, -32 * wordSize);
290 }
291
292 return generate_oop_map(sasm, save_fpu_registers);
293 }
294
295 static void restore_live_registers(StubAssembler* sasm, bool restore_fpu_registers = true) {
296 if (restore_fpu_registers) {
297 for (int i = 0; i < 32; i += 4)
298 __ ld1(as_FloatRegister(i), as_FloatRegister(i+1), as_FloatRegister(i+2),
299 as_FloatRegister(i+3), __ T1D, Address(__ post(sp, 4 * wordSize)));
300 } else {
301 __ add(sp, sp, 32 * wordSize);
302 }
303
304 __ pop(RegSet::range(r0, r29), sp);
305 }
306
307 static void restore_live_registers_except_r0(StubAssembler* sasm, bool restore_fpu_registers = true) {
308
309 if (restore_fpu_registers) {
310 for (int i = 0; i < 32; i += 4)
311 __ ld1(as_FloatRegister(i), as_FloatRegister(i+1), as_FloatRegister(i+2),
312 as_FloatRegister(i+3), __ T1D, Address(__ post(sp, 4 * wordSize)));
313 } else {
314 __ add(sp, sp, 32 * wordSize);
315 }
316
317 __ ldp(zr, r1, Address(__ post(sp, 16)));
318 __ pop(RegSet::range(r2, r29), sp);
319 }
320
321
322
323 void Runtime1::initialize_pd() {
324 int i;
325 int sp_offset = 0;
326
327 // all float registers are saved explicitly
328 assert(FrameMap::nof_fpu_regs == 32, "double registers not handled here");
329 for (i = 0; i < FrameMap::nof_fpu_regs; i++) {
330 fpu_reg_save_offsets[i] = sp_offset;
331 sp_offset += 2; // SP offsets are in halfwords
332 }
333
334 for (i = 0; i < FrameMap::nof_cpu_regs; i++) {
335 Register r = as_Register(i);
336 cpu_reg_save_offsets[i] = sp_offset;
337 sp_offset += 2; // SP offsets are in halfwords
338 }
339 }
340
341
342 // target: the entry point of the method that creates and posts the exception oop
343 // has_argument: true if the exception needs arguments (passed in rscratch1 and rscratch2)
344
345 OopMapSet* Runtime1::generate_exception_throw(StubAssembler* sasm, address target, bool has_argument) {
346 // make a frame and preserve the caller's caller-save registers
347 OopMap* oop_map = save_live_registers(sasm);
348 int call_offset;
349 if (!has_argument) {
350 call_offset = __ call_RT(noreg, noreg, target);
351 } else {
352 __ mov(c_rarg1, rscratch1);
353 __ mov(c_rarg2, rscratch2);
354 call_offset = __ call_RT(noreg, noreg, target);
355 }
356 OopMapSet* oop_maps = new OopMapSet();
357 oop_maps->add_gc_map(call_offset, oop_map);
358 return oop_maps;
359 }
360
361
362 OopMapSet* Runtime1::generate_handle_exception(StubID id, StubAssembler *sasm) {
363 __ block_comment("generate_handle_exception");
364
365 // incoming parameters
366 const Register exception_oop = r0;
367 const Register exception_pc = r3;
368 // other registers used in this stub
369
370 // Save registers, if required.
371 OopMapSet* oop_maps = new OopMapSet();
372 OopMap* oop_map = NULL;
373 switch (id) {
374 case forward_exception_id:
375 // We're handling an exception in the context of a compiled frame.
376 // The registers have been saved in the standard places. Perform
377 // an exception lookup in the caller and dispatch to the handler
378 // if found. Otherwise unwind and dispatch to the callers
379 // exception handler.
380 oop_map = generate_oop_map(sasm, 1 /*thread*/);
381
382 // load and clear pending exception oop into r0
383 __ ldr(exception_oop, Address(rthread, Thread::pending_exception_offset()));
384 __ str(zr, Address(rthread, Thread::pending_exception_offset()));
385
386 // load issuing PC (the return address for this stub) into r3
387 __ ldr(exception_pc, Address(rfp, 1*BytesPerWord));
388
389 // make sure that the vm_results are cleared (may be unnecessary)
390 __ str(zr, Address(rthread, JavaThread::vm_result_offset()));
391 __ str(zr, Address(rthread, JavaThread::vm_result_2_offset()));
392 break;
393 case handle_exception_nofpu_id:
394 case handle_exception_id:
395 // At this point all registers MAY be live.
396 oop_map = save_live_registers(sasm, id != handle_exception_nofpu_id);
397 break;
398 case handle_exception_from_callee_id: {
399 // At this point all registers except exception oop (r0) and
400 // exception pc (lr) are dead.
401 const int frame_size = 2 /*fp, return address*/;
402 oop_map = new OopMap(frame_size * VMRegImpl::slots_per_word, 0);
403 sasm->set_frame_size(frame_size);
404 break;
405 }
406 default: ShouldNotReachHere();
407 }
408
409 // verify that only r0 and r3 are valid at this time
410 __ invalidate_registers(false, true, true, false, true, true);
411 // verify that r0 contains a valid exception
412 __ verify_not_null_oop(exception_oop);
413
414 #ifdef ASSERT
415 // check that fields in JavaThread for exception oop and issuing pc are
416 // empty before writing to them
417 Label oop_empty;
418 __ ldr(rscratch1, Address(rthread, JavaThread::exception_oop_offset()));
419 __ cbz(rscratch1, oop_empty);
420 __ stop("exception oop already set");
421 __ bind(oop_empty);
422
423 Label pc_empty;
424 __ ldr(rscratch1, Address(rthread, JavaThread::exception_pc_offset()));
425 __ cbz(rscratch1, pc_empty);
426 __ stop("exception pc already set");
427 __ bind(pc_empty);
428 #endif
429
430 // save exception oop and issuing pc into JavaThread
431 // (exception handler will load it from here)
432 __ str(exception_oop, Address(rthread, JavaThread::exception_oop_offset()));
433 __ str(exception_pc, Address(rthread, JavaThread::exception_pc_offset()));
434
435 // patch throwing pc into return address (has bci & oop map)
436 __ str(exception_pc, Address(rfp, 1*BytesPerWord));
437
438 // compute the exception handler.
439 // the exception oop and the throwing pc are read from the fields in JavaThread
440 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, exception_handler_for_pc));
441 oop_maps->add_gc_map(call_offset, oop_map);
442
443 // r0: handler address
444 // will be the deopt blob if nmethod was deoptimized while we looked up
445 // handler regardless of whether handler existed in the nmethod.
446
447 // only r0 is valid at this time, all other registers have been destroyed by the runtime call
448 __ invalidate_registers(false, true, true, true, true, true);
449
450 // patch the return address, this stub will directly return to the exception handler
451 __ str(r0, Address(rfp, 1*BytesPerWord));
452
453 switch (id) {
454 case forward_exception_id:
455 case handle_exception_nofpu_id:
456 case handle_exception_id:
457 // Restore the registers that were saved at the beginning.
458 restore_live_registers(sasm, id != handle_exception_nofpu_id);
459 break;
460 case handle_exception_from_callee_id:
461 break;
462 default: ShouldNotReachHere();
463 }
464
465 return oop_maps;
466 }
467
468
469 void Runtime1::generate_unwind_exception(StubAssembler *sasm) {
470 // incoming parameters
471 const Register exception_oop = r0;
472 // callee-saved copy of exception_oop during runtime call
473 const Register exception_oop_callee_saved = r19;
474 // other registers used in this stub
475 const Register exception_pc = r3;
476 const Register handler_addr = r1;
477
478 // verify that only r0, is valid at this time
479 __ invalidate_registers(false, true, true, true, true, true);
480
481 #ifdef ASSERT
482 // check that fields in JavaThread for exception oop and issuing pc are empty
483 Label oop_empty;
484 __ ldr(rscratch1, Address(rthread, JavaThread::exception_oop_offset()));
485 __ cbz(rscratch1, oop_empty);
486 __ stop("exception oop must be empty");
487 __ bind(oop_empty);
488
489 Label pc_empty;
490 __ ldr(rscratch1, Address(rthread, JavaThread::exception_pc_offset()));
491 __ cbz(rscratch1, pc_empty);
492 __ stop("exception pc must be empty");
493 __ bind(pc_empty);
494 #endif
495
496 // Save our return address because
497 // exception_handler_for_return_address will destroy it. We also
498 // save exception_oop
499 __ stp(lr, exception_oop, Address(__ pre(sp, -2 * wordSize)));
500
501 // search the exception handler address of the caller (using the return address)
502 __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::exception_handler_for_return_address), rthread, lr);
503 // r0: exception handler address of the caller
504
505 // Only R0 is valid at this time; all other registers have been
506 // destroyed by the call.
507 __ invalidate_registers(false, true, true, true, false, true);
508
509 // move result of call into correct register
510 __ mov(handler_addr, r0);
511
512 // get throwing pc (= return address).
513 // lr has been destroyed by the call
514 __ ldp(lr, exception_oop, Address(__ post(sp, 2 * wordSize)));
515 __ mov(r3, lr);
516
517 __ verify_not_null_oop(exception_oop);
518
519 // continue at exception handler (return address removed)
520 // note: do *not* remove arguments when unwinding the
521 // activation since the caller assumes having
522 // all arguments on the stack when entering the
523 // runtime to determine the exception handler
524 // (GC happens at call site with arguments!)
525 // r0: exception oop
526 // r3: throwing pc
527 // r1: exception handler
528 __ br(handler_addr);
529 }
530
531
532
533 OopMapSet* Runtime1::generate_patching(StubAssembler* sasm, address target) {
534 // use the maximum number of runtime-arguments here because it is difficult to
535 // distinguish each RT-Call.
536 // Note: This number affects also the RT-Call in generate_handle_exception because
537 // the oop-map is shared for all calls.
538 DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob();
539 assert(deopt_blob != NULL, "deoptimization blob must have been created");
540
541 OopMap* oop_map = save_live_registers(sasm);
542
543 __ mov(c_rarg0, rthread);
544 Label retaddr;
545 __ set_last_Java_frame(sp, rfp, retaddr, rscratch1);
546 // do the call
547 __ lea(rscratch1, RuntimeAddress(target));
548 __ blr(rscratch1);
549 __ bind(retaddr);
550 OopMapSet* oop_maps = new OopMapSet();
551 oop_maps->add_gc_map(__ offset(), oop_map);
552 // verify callee-saved register
553 #ifdef ASSERT
554 { Label L;
555 __ get_thread(rscratch1);
556 __ cmp(rthread, rscratch1);
557 __ br(Assembler::EQ, L);
558 __ stop("StubAssembler::call_RT: rthread not callee saved?");
559 __ bind(L);
560 }
561 #endif
562
563 __ reset_last_Java_frame(true);
564
565 #ifdef ASSERT
566 // check that fields in JavaThread for exception oop and issuing pc are empty
567 Label oop_empty;
568 __ ldr(rscratch1, Address(rthread, Thread::pending_exception_offset()));
569 __ cbz(rscratch1, oop_empty);
570 __ stop("exception oop must be empty");
571 __ bind(oop_empty);
572
573 Label pc_empty;
574 __ ldr(rscratch1, Address(rthread, JavaThread::exception_pc_offset()));
575 __ cbz(rscratch1, pc_empty);
576 __ stop("exception pc must be empty");
577 __ bind(pc_empty);
578 #endif
579
580 // Runtime will return true if the nmethod has been deoptimized, this is the
581 // expected scenario and anything else is an error. Note that we maintain a
582 // check on the result purely as a defensive measure.
583 Label no_deopt;
584 __ cbz(r0, no_deopt); // Have we deoptimized?
585
586 // Perform a re-execute. The proper return address is already on the stack,
587 // we just need to restore registers, pop all of our frame but the return
588 // address and jump to the deopt blob.
589 restore_live_registers(sasm);
590 __ leave();
591 __ far_jump(RuntimeAddress(deopt_blob->unpack_with_reexecution()));
592
593 __ bind(no_deopt);
594 __ stop("deopt not performed");
595
596 return oop_maps;
597 }
598
599
600 OopMapSet* Runtime1::generate_code_for(StubID id, StubAssembler* sasm) {
601
602 const Register exception_oop = r0;
603 const Register exception_pc = r3;
604
605 // for better readability
606 const bool must_gc_arguments = true;
607 const bool dont_gc_arguments = false;
608
609 // default value; overwritten for some optimized stubs that are called from methods that do not use the fpu
610 bool save_fpu_registers = true;
611
612 // stub code & info for the different stubs
613 OopMapSet* oop_maps = NULL;
614 OopMap* oop_map = NULL;
615 switch (id) {
616 {
617 case forward_exception_id:
618 {
619 oop_maps = generate_handle_exception(id, sasm);
620 __ leave();
621 __ ret(lr);
622 }
623 break;
624
625 case throw_div0_exception_id:
626 { StubFrame f(sasm, "throw_div0_exception", dont_gc_arguments, does_not_return);
627 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_div0_exception), false);
628 }
629 break;
630
631 case throw_null_pointer_exception_id:
632 { StubFrame f(sasm, "throw_null_pointer_exception", dont_gc_arguments, does_not_return);
633 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_null_pointer_exception), false);
634 }
635 break;
636
637 case new_instance_id:
638 case new_instance_no_inline_id:
639 case fast_new_instance_id:
640 case fast_new_instance_init_check_id:
641 {
642 Register klass = r3; // Incoming
643 Register obj = r0; // Result
644
645 if (id == new_instance_id) {
646 __ set_info("new_instance", dont_gc_arguments);
647 } else if (id == new_instance_no_inline_id) {
648 __ set_info("new_instance_no_inline", dont_gc_arguments);
649 } else if (id == fast_new_instance_id) {
650 __ set_info("fast new_instance", dont_gc_arguments);
651 } else {
652 assert(id == fast_new_instance_init_check_id, "bad StubID");
653 __ set_info("fast new_instance init check", dont_gc_arguments);
654 }
655
656 // If TLAB is disabled, see if there is support for inlining contiguous
657 // allocations.
658 // Otherwise, just go to the slow path.
659 if ((id == fast_new_instance_id || id == fast_new_instance_init_check_id) &&
660 !UseTLAB && Universe::heap()->supports_inline_contig_alloc()) {
661 Label slow_path;
662 Register obj_size = r19;
663 Register t1 = r10;
664 Register t2 = r11;
665 assert_different_registers(klass, obj, obj_size, t1, t2);
666
667 __ stp(r19, zr, Address(__ pre(sp, -2 * wordSize)));
668
669 if (id == fast_new_instance_init_check_id) {
670 // make sure the klass is initialized
671 __ ldrb(rscratch1, Address(klass, InstanceKlass::init_state_offset()));
672 __ cmpw(rscratch1, InstanceKlass::fully_initialized);
673 __ br(Assembler::NE, slow_path);
674 }
675
676 #ifdef ASSERT
677 // assert object can be fast path allocated
678 {
679 Label ok, not_ok;
680 __ ldrw(obj_size, Address(klass, Klass::layout_helper_offset()));
681 __ cmp(obj_size, (u1)0);
682 __ br(Assembler::LE, not_ok); // make sure it's an instance (LH > 0)
683 __ tstw(obj_size, Klass::_lh_instance_slow_path_bit);
684 __ br(Assembler::EQ, ok);
685 __ bind(not_ok);
686 __ stop("assert(can be fast path allocated)");
687 __ should_not_reach_here();
688 __ bind(ok);
689 }
690 #endif // ASSERT
691
692 // get the instance size (size is postive so movl is fine for 64bit)
693 __ ldrw(obj_size, Address(klass, Klass::layout_helper_offset()));
694
695 __ eden_allocate(obj, obj_size, 0, t1, slow_path);
696
697 __ initialize_object(obj, klass, obj_size, 0, t1, t2, /* is_tlab_allocated */ false);
698 __ verify_oop(obj);
699 __ ldp(r19, zr, Address(__ post(sp, 2 * wordSize)));
700 __ ret(lr);
701
702 __ bind(slow_path);
703 __ ldp(r19, zr, Address(__ post(sp, 2 * wordSize)));
704 }
705
706 __ enter();
707 OopMap* map = save_live_registers(sasm);
708 int call_offset;
709 if (id == new_instance_no_inline_id) {
710 call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_instance_no_inline), klass);
711 } else {
712 call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_instance), klass);
713 }
714 oop_maps = new OopMapSet();
715 oop_maps->add_gc_map(call_offset, map);
716 restore_live_registers_except_r0(sasm);
717 __ verify_oop(obj);
718 __ leave();
719 __ ret(lr);
720
721 // r0,: new instance
722 }
723
724 break;
725
726 case counter_overflow_id:
727 {
728 Register bci = r0, method = r1;
729 __ enter();
730 OopMap* map = save_live_registers(sasm);
731 // Retrieve bci
732 __ ldrw(bci, Address(rfp, 2*BytesPerWord));
733 // And a pointer to the Method*
734 __ ldr(method, Address(rfp, 3*BytesPerWord));
735 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, counter_overflow), bci, method);
736 oop_maps = new OopMapSet();
737 oop_maps->add_gc_map(call_offset, map);
738 restore_live_registers(sasm);
739 __ leave();
740 __ ret(lr);
741 }
742 break;
743
744 case new_type_array_id:
745 case new_object_array_id:
746 case new_flat_array_id:
747 {
748 Register length = r19; // Incoming
749 Register klass = r3; // Incoming
750 Register obj = r0; // Result
751
752 if (id == new_type_array_id) {
753 __ set_info("new_type_array", dont_gc_arguments);
754 } else if (id == new_object_array_id) {
755 __ set_info("new_object_array", dont_gc_arguments);
756 } else {
757 __ set_info("new_flat_array", dont_gc_arguments);
758 }
759
760 #ifdef ASSERT
761 // assert object type is really an array of the proper kind
762 {
763 Label ok;
764 Register t0 = obj;
765 __ ldrw(t0, Address(klass, Klass::layout_helper_offset()));
766 __ asrw(t0, t0, Klass::_lh_array_tag_shift);
767 switch (id) {
768 case new_type_array_id:
769 __ cmpw(t0, Klass::_lh_array_tag_type_value);
770 __ br(Assembler::EQ, ok);
771 __ stop("assert(is a type array klass)");
772 break;
773 case new_object_array_id:
774 __ cmpw(t0, Klass::_lh_array_tag_obj_value); // new "[Ljava/lang/Object;"
775 __ br(Assembler::EQ, ok);
776 __ cmpw(t0, Klass::_lh_array_tag_vt_value); // new "[LVT;"
777 __ br(Assembler::EQ, ok);
778 __ stop("assert(is an object or inline type array klass)");
779 break;
780 case new_flat_array_id:
781 // new "[QVT;"
782 __ cmpw(t0, Klass::_lh_array_tag_vt_value); // the array can be flattened.
783 __ br(Assembler::EQ, ok);
784 __ cmpw(t0, Klass::_lh_array_tag_obj_value); // the array cannot be flattened (due to InlineArrayElementMaxFlatSize, etc)
785 __ br(Assembler::EQ, ok);
786 __ stop("assert(is an object or inline type array klass)");
787 break;
788 default: ShouldNotReachHere();
789 }
790 __ should_not_reach_here();
791 __ bind(ok);
792 }
793 #endif // ASSERT
794
795 // If TLAB is disabled, see if there is support for inlining contiguous
796 // allocations.
797 // Otherwise, just go to the slow path.
798 if (!UseTLAB && Universe::heap()->supports_inline_contig_alloc()) {
799 Register arr_size = r5;
800 Register t1 = r10;
801 Register t2 = r11;
802 Label slow_path;
803 assert_different_registers(length, klass, obj, arr_size, t1, t2);
804
805 // check that array length is small enough for fast path.
806 __ mov(rscratch1, C1_MacroAssembler::max_array_allocation_length);
807 __ cmpw(length, rscratch1);
808 __ br(Assembler::HI, slow_path);
809
810 // get the allocation size: round_up(hdr + length << (layout_helper & 0x1F))
811 // since size is positive ldrw does right thing on 64bit
812 __ ldrw(t1, Address(klass, Klass::layout_helper_offset()));
813 // since size is positive movw does right thing on 64bit
814 __ movw(arr_size, length);
815 __ lslvw(arr_size, length, t1);
816 __ ubfx(t1, t1, Klass::_lh_header_size_shift,
817 exact_log2(Klass::_lh_header_size_mask + 1));
818 __ add(arr_size, arr_size, t1);
819 __ add(arr_size, arr_size, MinObjAlignmentInBytesMask); // align up
820 __ andr(arr_size, arr_size, ~MinObjAlignmentInBytesMask);
821
822 __ eden_allocate(obj, arr_size, 0, t1, slow_path); // preserves arr_size
823
824 __ initialize_header(obj, klass, length, t1, t2);
825 __ ldrb(t1, Address(klass, in_bytes(Klass::layout_helper_offset()) + (Klass::_lh_header_size_shift / BitsPerByte)));
826 assert(Klass::_lh_header_size_shift % BitsPerByte == 0, "bytewise");
827 assert(Klass::_lh_header_size_mask <= 0xFF, "bytewise");
828 __ andr(t1, t1, Klass::_lh_header_size_mask);
829 __ sub(arr_size, arr_size, t1); // body length
830 __ add(t1, t1, obj); // body start
831 __ initialize_body(t1, arr_size, 0, t1, t2);
832 __ membar(Assembler::StoreStore);
833 __ verify_oop(obj);
834
835 __ ret(lr);
836
837 __ bind(slow_path);
838 }
839
840 __ enter();
841 OopMap* map = save_live_registers(sasm);
842 int call_offset;
843 if (id == new_type_array_id) {
844 call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_type_array), klass, length);
845 } else if (id == new_object_array_id) {
846 call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_object_array), klass, length);
847 } else {
848 assert(id == new_flat_array_id, "must be");
849 call_offset = __ call_RT(obj, noreg, CAST_FROM_FN_PTR(address, new_flat_array), klass, length);
850 }
851
852 oop_maps = new OopMapSet();
853 oop_maps->add_gc_map(call_offset, map);
854 restore_live_registers_except_r0(sasm);
855
856 __ verify_oop(obj);
857 __ leave();
858 __ ret(lr);
859
860 // r0: new array
861 }
862 break;
863
864 case new_multi_array_id:
865 { StubFrame f(sasm, "new_multi_array", dont_gc_arguments);
866 // r0,: klass
867 // r19,: rank
868 // r2: address of 1st dimension
869 OopMap* map = save_live_registers(sasm);
870 __ mov(c_rarg1, r0);
871 __ mov(c_rarg3, r2);
872 __ mov(c_rarg2, r19);
873 int call_offset = __ call_RT(r0, noreg, CAST_FROM_FN_PTR(address, new_multi_array), r1, r2, r3);
874
875 oop_maps = new OopMapSet();
876 oop_maps->add_gc_map(call_offset, map);
877 restore_live_registers_except_r0(sasm);
878
879 // r0,: new multi array
880 __ verify_oop(r0);
881 }
882 break;
883
884 case buffer_inline_args_id:
885 case buffer_inline_args_no_receiver_id:
886 {
887 const char* name = (id == buffer_inline_args_id) ?
888 "buffer_inline_args" : "buffer_inline_args_no_receiver";
889 StubFrame f(sasm, name, dont_gc_arguments);
890 OopMap* map = save_live_registers(sasm);
891 Register method = r19; // Incoming
892 address entry = (id == buffer_inline_args_id) ?
893 CAST_FROM_FN_PTR(address, buffer_inline_args) :
894 CAST_FROM_FN_PTR(address, buffer_inline_args_no_receiver);
895 // This is called from a C1 method's scalarized entry point
896 // where r0-r7 may be holding live argument values so we can't
897 // return the result in r0 as the other stubs do. LR is used as
898 // a temporay below to avoid the result being clobbered by
899 // restore_live_registers.
900 int call_offset = __ call_RT(lr, noreg, entry, method);
901 oop_maps = new OopMapSet();
902 oop_maps->add_gc_map(call_offset, map);
903 restore_live_registers(sasm);
904 __ mov(r20, lr);
905 __ verify_oop(r20); // r20: an array of buffered value objects
906 }
907 break;
908
909 case load_flattened_array_id:
910 {
911 StubFrame f(sasm, "load_flattened_array", dont_gc_arguments);
912 OopMap* map = save_live_registers(sasm);
913
914 // Called with store_parameter and not C abi
915
916 f.load_argument(1, r0); // r0,: array
917 f.load_argument(0, r1); // r1,: index
918 int call_offset = __ call_RT(r0, noreg, CAST_FROM_FN_PTR(address, load_flattened_array), r0, r1);
919
920 oop_maps = new OopMapSet();
921 oop_maps->add_gc_map(call_offset, map);
922 restore_live_registers_except_r0(sasm);
923
924 // r0: loaded element at array[index]
925 __ verify_oop(r0);
926 }
927 break;
928
929 case store_flattened_array_id:
930 {
931 StubFrame f(sasm, "store_flattened_array", dont_gc_arguments);
932 OopMap* map = save_live_registers(sasm, 4);
933
934 // Called with store_parameter and not C abi
935
936 f.load_argument(2, r0); // r0: array
937 f.load_argument(1, r1); // r1: index
938 f.load_argument(0, r2); // r2: value
939 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, store_flattened_array), r0, r1, r2);
940
941 oop_maps = new OopMapSet();
942 oop_maps->add_gc_map(call_offset, map);
943 restore_live_registers_except_r0(sasm);
944 }
945 break;
946
947 case substitutability_check_id:
948 {
949 StubFrame f(sasm, "substitutability_check", dont_gc_arguments);
950 OopMap* map = save_live_registers(sasm);
951
952 // Called with store_parameter and not C abi
953
954 f.load_argument(1, r1); // r1,: left
955 f.load_argument(0, r2); // r2,: right
956 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, substitutability_check), r1, r2);
957
958 oop_maps = new OopMapSet();
959 oop_maps->add_gc_map(call_offset, map);
960 restore_live_registers_except_r0(sasm);
961
962 // r0,: are the two operands substitutable
963 }
964 break;
965
966 case register_finalizer_id:
967 {
968 __ set_info("register_finalizer", dont_gc_arguments);
969
970 // This is called via call_runtime so the arguments
971 // will be place in C abi locations
972
973 __ verify_oop(c_rarg0);
974
975 // load the klass and check the has finalizer flag
976 Label register_finalizer;
977 Register t = r5;
978 __ load_klass(t, r0);
979 __ ldrw(t, Address(t, Klass::access_flags_offset()));
980 __ tbnz(t, exact_log2(JVM_ACC_HAS_FINALIZER), register_finalizer);
981 __ ret(lr);
982
983 __ bind(register_finalizer);
984 __ enter();
985 OopMap* oop_map = save_live_registers(sasm);
986 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, SharedRuntime::register_finalizer), r0);
987 oop_maps = new OopMapSet();
988 oop_maps->add_gc_map(call_offset, oop_map);
989
990 // Now restore all the live registers
991 restore_live_registers(sasm);
992
993 __ leave();
994 __ ret(lr);
995 }
996 break;
997
998 case throw_class_cast_exception_id:
999 { StubFrame f(sasm, "throw_class_cast_exception", dont_gc_arguments, does_not_return);
1000 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_class_cast_exception), true);
1001 }
1002 break;
1003
1004 case throw_incompatible_class_change_error_id:
1005 { StubFrame f(sasm, "throw_incompatible_class_change_error", dont_gc_arguments, does_not_return);
1006 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_incompatible_class_change_error), false);
1007 }
1008 break;
1009
1010 case throw_illegal_monitor_state_exception_id:
1011 { StubFrame f(sasm, "throw_illegal_monitor_state_exception", dont_gc_arguments);
1012 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_illegal_monitor_state_exception), false);
1013 }
1014 break;
1015
1016 case slow_subtype_check_id:
1017 {
1018 // Typical calling sequence:
1019 // __ push(klass_RInfo); // object klass or other subclass
1020 // __ push(sup_k_RInfo); // array element klass or other superclass
1021 // __ bl(slow_subtype_check);
1022 // Note that the subclass is pushed first, and is therefore deepest.
1023 enum layout {
1024 r0_off, r0_off_hi,
1025 r2_off, r2_off_hi,
1026 r4_off, r4_off_hi,
1027 r5_off, r5_off_hi,
1028 sup_k_off, sup_k_off_hi,
1029 klass_off, klass_off_hi,
1030 framesize,
1031 result_off = sup_k_off
1032 };
1033
1034 __ set_info("slow_subtype_check", dont_gc_arguments);
1035 __ push(RegSet::of(r0, r2, r4, r5), sp);
1036
1037 // This is called by pushing args and not with C abi
1038 // __ ldr(r4, Address(sp, (klass_off) * VMRegImpl::stack_slot_size)); // subclass
1039 // __ ldr(r0, Address(sp, (sup_k_off) * VMRegImpl::stack_slot_size)); // superclass
1040
1041 __ ldp(r4, r0, Address(sp, (sup_k_off) * VMRegImpl::stack_slot_size));
1042
1043 Label miss;
1044 __ check_klass_subtype_slow_path(r4, r0, r2, r5, NULL, &miss);
1045
1046 // fallthrough on success:
1047 __ mov(rscratch1, 1);
1048 __ str(rscratch1, Address(sp, (result_off) * VMRegImpl::stack_slot_size)); // result
1049 __ pop(RegSet::of(r0, r2, r4, r5), sp);
1050 __ ret(lr);
1051
1052 __ bind(miss);
1053 __ str(zr, Address(sp, (result_off) * VMRegImpl::stack_slot_size)); // result
1054 __ pop(RegSet::of(r0, r2, r4, r5), sp);
1055 __ ret(lr);
1056 }
1057 break;
1058
1059 case monitorenter_nofpu_id:
1060 save_fpu_registers = false;
1061 // fall through
1062 case monitorenter_id:
1063 {
1064 StubFrame f(sasm, "monitorenter", dont_gc_arguments);
1065 OopMap* map = save_live_registers(sasm, save_fpu_registers);
1066
1067 // Called with store_parameter and not C abi
1068
1069 f.load_argument(1, r0); // r0,: object
1070 f.load_argument(0, r1); // r1,: lock address
1071
1072 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, monitorenter), r0, r1);
1073
1074 oop_maps = new OopMapSet();
1075 oop_maps->add_gc_map(call_offset, map);
1076 restore_live_registers(sasm, save_fpu_registers);
1077 }
1078 break;
1079
1080 case monitorexit_nofpu_id:
1081 save_fpu_registers = false;
1082 // fall through
1083 case monitorexit_id:
1084 {
1085 StubFrame f(sasm, "monitorexit", dont_gc_arguments);
1086 OopMap* map = save_live_registers(sasm, save_fpu_registers);
1087
1088 // Called with store_parameter and not C abi
1089
1090 f.load_argument(0, r0); // r0,: lock address
1091
1092 // note: really a leaf routine but must setup last java sp
1093 // => use call_RT for now (speed can be improved by
1094 // doing last java sp setup manually)
1095 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, monitorexit), r0);
1096
1097 oop_maps = new OopMapSet();
1098 oop_maps->add_gc_map(call_offset, map);
1099 restore_live_registers(sasm, save_fpu_registers);
1100 }
1101 break;
1102
1103 case deoptimize_id:
1104 {
1105 StubFrame f(sasm, "deoptimize", dont_gc_arguments, does_not_return);
1106 OopMap* oop_map = save_live_registers(sasm);
1107 f.load_argument(0, c_rarg1);
1108 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, deoptimize), c_rarg1);
1109
1110 oop_maps = new OopMapSet();
1111 oop_maps->add_gc_map(call_offset, oop_map);
1112 restore_live_registers(sasm);
1113 DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob();
1114 assert(deopt_blob != NULL, "deoptimization blob must have been created");
1115 __ leave();
1116 __ far_jump(RuntimeAddress(deopt_blob->unpack_with_reexecution()));
1117 }
1118 break;
1119
1120 case throw_range_check_failed_id:
1121 { StubFrame f(sasm, "range_check_failed", dont_gc_arguments, does_not_return);
1122 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_range_check_exception), true);
1123 }
1124 break;
1125
1126 case unwind_exception_id:
1127 { __ set_info("unwind_exception", dont_gc_arguments);
1128 // note: no stubframe since we are about to leave the current
1129 // activation and we are calling a leaf VM function only.
1130 generate_unwind_exception(sasm);
1131 }
1132 break;
1133
1134 case access_field_patching_id:
1135 { StubFrame f(sasm, "access_field_patching", dont_gc_arguments, does_not_return);
1136 // we should set up register map
1137 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, access_field_patching));
1138 }
1139 break;
1140
1141 case load_klass_patching_id:
1142 { StubFrame f(sasm, "load_klass_patching", dont_gc_arguments, does_not_return);
1143 // we should set up register map
1144 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_klass_patching));
1145 }
1146 break;
1147
1148 case load_mirror_patching_id:
1149 { StubFrame f(sasm, "load_mirror_patching", dont_gc_arguments, does_not_return);
1150 // we should set up register map
1151 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_mirror_patching));
1152 }
1153 break;
1154
1155 case load_appendix_patching_id:
1156 { StubFrame f(sasm, "load_appendix_patching", dont_gc_arguments, does_not_return);
1157 // we should set up register map
1158 oop_maps = generate_patching(sasm, CAST_FROM_FN_PTR(address, move_appendix_patching));
1159 }
1160 break;
1161
1162 case handle_exception_nofpu_id:
1163 case handle_exception_id:
1164 { StubFrame f(sasm, "handle_exception", dont_gc_arguments);
1165 oop_maps = generate_handle_exception(id, sasm);
1166 }
1167 break;
1168
1169 case handle_exception_from_callee_id:
1170 { StubFrame f(sasm, "handle_exception_from_callee", dont_gc_arguments);
1171 oop_maps = generate_handle_exception(id, sasm);
1172 }
1173 break;
1174
1175 case throw_index_exception_id:
1176 { StubFrame f(sasm, "index_range_check_failed", dont_gc_arguments, does_not_return);
1177 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_index_exception), true);
1178 }
1179 break;
1180
1181 case throw_array_store_exception_id:
1182 { StubFrame f(sasm, "throw_array_store_exception", dont_gc_arguments, does_not_return);
1183 // tos + 0: link
1184 // + 1: return address
1185 oop_maps = generate_exception_throw(sasm, CAST_FROM_FN_PTR(address, throw_array_store_exception), true);
1186 }
1187 break;
1188
1189 case predicate_failed_trap_id:
1190 {
1191 StubFrame f(sasm, "predicate_failed_trap", dont_gc_arguments, does_not_return);
1192
1193 OopMap* map = save_live_registers(sasm);
1194
1195 int call_offset = __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, predicate_failed_trap));
1196 oop_maps = new OopMapSet();
1197 oop_maps->add_gc_map(call_offset, map);
1198 restore_live_registers(sasm);
1199 __ leave();
1200 DeoptimizationBlob* deopt_blob = SharedRuntime::deopt_blob();
1201 assert(deopt_blob != NULL, "deoptimization blob must have been created");
1202
1203 __ far_jump(RuntimeAddress(deopt_blob->unpack_with_reexecution()));
1204 }
1205 break;
1206
1207 case dtrace_object_alloc_id:
1208 { // c_rarg0: object
1209 StubFrame f(sasm, "dtrace_object_alloc", dont_gc_arguments);
1210 save_live_registers(sasm);
1211
1212 __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_object_alloc), c_rarg0);
1213
1214 restore_live_registers(sasm);
1215 }
1216 break;
1217
1218 default:
1219 // FIXME: For unhandled trap_id this code fails with assert during vm intialization
1220 // rather than insert a call to unimplemented_entry
1221 { StubFrame f(sasm, "unimplemented entry", dont_gc_arguments, does_not_return);
1222 __ mov(r0, (int)id);
1223 __ call_RT(noreg, noreg, CAST_FROM_FN_PTR(address, unimplemented_entry), r0);
1224 }
1225 break;
1226 }
1227 }
1228
1229
1230 return oop_maps;
1231 }
1232
1233 #undef __
1234
1235 const char *Runtime1::pd_name_for_address(address entry) { Unimplemented(); return 0; }