1 /*
2 * Copyright (c) 2003, 2022, 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 "asm/macroAssembler.hpp"
27 #include "classfile/javaClasses.hpp"
28 #include "compiler/compiler_globals.hpp"
29 #include "compiler/disassembler.hpp"
30 #include "gc/shared/barrierSetAssembler.hpp"
31 #include "interpreter/bytecodeHistogram.hpp"
32 #include "interpreter/interp_masm.hpp"
33 #include "interpreter/interpreter.hpp"
34 #include "interpreter/interpreterRuntime.hpp"
35 #include "interpreter/templateInterpreterGenerator.hpp"
36 #include "interpreter/templateTable.hpp"
37 #include "oops/arrayOop.hpp"
38 #include "oops/methodData.hpp"
39 #include "oops/method.hpp"
40 #include "oops/oop.inline.hpp"
41 #include "oops/inlineKlass.hpp"
42 #include "prims/jvmtiExport.hpp"
43 #include "prims/jvmtiThreadState.hpp"
44 #include "runtime/deoptimization.hpp"
45 #include "runtime/frame.inline.hpp"
46 #include "runtime/jniHandles.hpp"
47 #include "runtime/sharedRuntime.hpp"
48 #include "runtime/stubRoutines.hpp"
49 #include "runtime/synchronizer.hpp"
50 #include "runtime/timer.hpp"
51 #include "runtime/vframeArray.hpp"
52 #include "utilities/debug.hpp"
53 #include "utilities/macros.hpp"
54
55 #define __ Disassembler::hook<InterpreterMacroAssembler>(__FILE__, __LINE__, _masm)->
56
57 // Size of interpreter code. Increase if too small. Interpreter will
58 // fail with a guarantee ("not enough space for interpreter generation");
59 // if too small.
60 // Run with +PrintInterpreter to get the VM to print out the size.
61 // Max size with JVMTI
62 #ifdef AMD64
63 int TemplateInterpreter::InterpreterCodeSize = JVMCI_ONLY(280) NOT_JVMCI(268) * 1024;
64 #else
65 int TemplateInterpreter::InterpreterCodeSize = 224 * 1024;
66 #endif // AMD64
67
68 // Global Register Names
69 static const Register rbcp = LP64_ONLY(r13) NOT_LP64(rsi);
70 static const Register rlocals = LP64_ONLY(r14) NOT_LP64(rdi);
71
72 const int method_offset = frame::interpreter_frame_method_offset * wordSize;
73 const int bcp_offset = frame::interpreter_frame_bcp_offset * wordSize;
74 const int locals_offset = frame::interpreter_frame_locals_offset * wordSize;
75
76
77 //-----------------------------------------------------------------------------
78
79 address TemplateInterpreterGenerator::generate_StackOverflowError_handler() {
80 address entry = __ pc();
81
82 #ifdef ASSERT
83 {
84 Label L;
85 __ lea(rax, Address(rbp,
86 frame::interpreter_frame_monitor_block_top_offset *
87 wordSize));
88 __ cmpptr(rax, rsp); // rax = maximal rsp for current rbp (stack
89 // grows negative)
90 __ jcc(Assembler::aboveEqual, L); // check if frame is complete
91 __ stop ("interpreter frame not set up");
92 __ bind(L);
93 }
94 #endif // ASSERT
95 // Restore bcp under the assumption that the current frame is still
96 // interpreted
97 __ restore_bcp();
98
99 // expression stack must be empty before entering the VM if an
100 // exception happened
101 __ empty_expression_stack();
102 // throw exception
103 __ call_VM(noreg,
104 CAST_FROM_FN_PTR(address,
105 InterpreterRuntime::throw_StackOverflowError));
106 return entry;
107 }
108
109 address TemplateInterpreterGenerator::generate_ArrayIndexOutOfBounds_handler() {
110 address entry = __ pc();
111 // The expression stack must be empty before entering the VM if an
112 // exception happened.
113 __ empty_expression_stack();
114
115 // Setup parameters.
116 // ??? convention: expect aberrant index in register ebx/rbx.
117 // Pass array to create more detailed exceptions.
118 Register rarg = NOT_LP64(rax) LP64_ONLY(c_rarg1);
119 __ call_VM(noreg,
120 CAST_FROM_FN_PTR(address,
121 InterpreterRuntime::
122 throw_ArrayIndexOutOfBoundsException),
123 rarg, rbx);
124 return entry;
125 }
126
127 address TemplateInterpreterGenerator::generate_ClassCastException_handler() {
128 address entry = __ pc();
129
130 // object is at TOS
131 Register rarg = NOT_LP64(rax) LP64_ONLY(c_rarg1);
132 __ pop(rarg);
133
134 // expression stack must be empty before entering the VM if an
135 // exception happened
136 __ empty_expression_stack();
137
138 __ call_VM(noreg,
139 CAST_FROM_FN_PTR(address,
140 InterpreterRuntime::
141 throw_ClassCastException),
142 rarg);
143 return entry;
144 }
145
146 address TemplateInterpreterGenerator::generate_exception_handler_common(
147 const char* name, const char* message, bool pass_oop) {
148 assert(!pass_oop || message == NULL, "either oop or message but not both");
149 address entry = __ pc();
150
151 Register rarg = NOT_LP64(rax) LP64_ONLY(c_rarg1);
152 Register rarg2 = NOT_LP64(rbx) LP64_ONLY(c_rarg2);
153
154 if (pass_oop) {
155 // object is at TOS
156 __ pop(rarg2);
157 }
158 // expression stack must be empty before entering the VM if an
159 // exception happened
160 __ empty_expression_stack();
161 // setup parameters
162 __ lea(rarg, ExternalAddress((address)name));
163 if (pass_oop) {
164 __ call_VM(rax, CAST_FROM_FN_PTR(address,
165 InterpreterRuntime::
166 create_klass_exception),
167 rarg, rarg2);
168 } else {
169 __ lea(rarg2, ExternalAddress((address)message));
170 __ call_VM(rax,
171 CAST_FROM_FN_PTR(address, InterpreterRuntime::create_exception),
172 rarg, rarg2);
173 }
174 // throw exception
175 __ jump(ExternalAddress(Interpreter::throw_exception_entry()));
176 return entry;
177 }
178
179 address TemplateInterpreterGenerator::generate_return_entry_for(TosState state, int step, size_t index_size) {
180 address entry = __ pc();
181
182 #ifndef _LP64
183 #ifdef COMPILER2
184 // The FPU stack is clean if UseSSE >= 2 but must be cleaned in other cases
185 if ((state == ftos && UseSSE < 1) || (state == dtos && UseSSE < 2)) {
186 for (int i = 1; i < 8; i++) {
187 __ ffree(i);
188 }
189 } else if (UseSSE < 2) {
190 __ empty_FPU_stack();
191 }
192 #endif // COMPILER2
193 if ((state == ftos && UseSSE < 1) || (state == dtos && UseSSE < 2)) {
194 __ MacroAssembler::verify_FPU(1, "generate_return_entry_for compiled");
195 } else {
196 __ MacroAssembler::verify_FPU(0, "generate_return_entry_for compiled");
197 }
198
199 if (state == ftos) {
200 __ MacroAssembler::verify_FPU(UseSSE >= 1 ? 0 : 1, "generate_return_entry_for in interpreter");
201 } else if (state == dtos) {
202 __ MacroAssembler::verify_FPU(UseSSE >= 2 ? 0 : 1, "generate_return_entry_for in interpreter");
203 }
204 #endif // _LP64
205
206 // Restore stack bottom in case i2c adjusted stack
207 __ movptr(rsp, Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize));
208 // and NULL it as marker that esp is now tos until next java call
209 __ movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), (int32_t)NULL_WORD);
210
211 if (state == atos && InlineTypeReturnedAsFields) {
212 __ store_inline_type_fields_to_buf(NULL);
213 }
214
215 __ restore_bcp();
216 __ restore_locals();
217
218 if (state == atos) {
219 Register mdp = rbx;
220 Register tmp = rcx;
221 __ profile_return_type(mdp, rax, tmp);
222 }
223
224 const Register cache = rbx;
225 const Register index = rcx;
226 __ get_cache_and_index_at_bcp(cache, index, 1, index_size);
227
228 const Register flags = cache;
229 __ movl(flags, Address(cache, index, Address::times_ptr, ConstantPoolCache::base_offset() + ConstantPoolCacheEntry::flags_offset()));
230 __ andl(flags, ConstantPoolCacheEntry::parameter_size_mask);
231 __ lea(rsp, Address(rsp, flags, Interpreter::stackElementScale()));
232
233 const Register java_thread = NOT_LP64(rcx) LP64_ONLY(r15_thread);
234 if (JvmtiExport::can_pop_frame()) {
235 NOT_LP64(__ get_thread(java_thread));
236 __ check_and_handle_popframe(java_thread);
237 }
238 if (JvmtiExport::can_force_early_return()) {
239 NOT_LP64(__ get_thread(java_thread));
240 __ check_and_handle_earlyret(java_thread);
241 }
242
243 __ dispatch_next(state, step);
244
245 return entry;
246 }
247
248
249 address TemplateInterpreterGenerator::generate_deopt_entry_for(TosState state, int step, address continuation) {
250 address entry = __ pc();
251
252 #ifndef _LP64
253 if (state == ftos) {
254 __ MacroAssembler::verify_FPU(UseSSE >= 1 ? 0 : 1, "generate_deopt_entry_for in interpreter");
255 } else if (state == dtos) {
256 __ MacroAssembler::verify_FPU(UseSSE >= 2 ? 0 : 1, "generate_deopt_entry_for in interpreter");
257 }
258 #endif // _LP64
259
260 // NULL last_sp until next java call
261 __ movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), (int32_t)NULL_WORD);
262 __ restore_bcp();
263 __ restore_locals();
264 const Register thread = NOT_LP64(rcx) LP64_ONLY(r15_thread);
265 NOT_LP64(__ get_thread(thread));
266 #if INCLUDE_JVMCI
267 // Check if we need to take lock at entry of synchronized method. This can
268 // only occur on method entry so emit it only for vtos with step 0.
269 if (EnableJVMCI && state == vtos && step == 0) {
270 Label L;
271 __ cmpb(Address(thread, JavaThread::pending_monitorenter_offset()), 0);
272 __ jcc(Assembler::zero, L);
273 // Clear flag.
274 __ movb(Address(thread, JavaThread::pending_monitorenter_offset()), 0);
275 // Satisfy calling convention for lock_method().
276 __ get_method(rbx);
277 // Take lock.
278 lock_method();
279 __ bind(L);
280 } else {
281 #ifdef ASSERT
282 if (EnableJVMCI) {
283 Label L;
284 __ cmpb(Address(r15_thread, JavaThread::pending_monitorenter_offset()), 0);
285 __ jcc(Assembler::zero, L);
286 __ stop("unexpected pending monitor in deopt entry");
287 __ bind(L);
288 }
289 #endif
290 }
291 #endif
292 // handle exceptions
293 {
294 Label L;
295 __ cmpptr(Address(thread, Thread::pending_exception_offset()), (int32_t) NULL_WORD);
296 __ jcc(Assembler::zero, L);
297 __ call_VM(noreg,
298 CAST_FROM_FN_PTR(address,
299 InterpreterRuntime::throw_pending_exception));
300 __ should_not_reach_here();
301 __ bind(L);
302 }
303 if (continuation == NULL) {
304 __ dispatch_next(state, step);
305 } else {
306 __ jump_to_entry(continuation);
307 }
308 return entry;
309 }
310
311 address TemplateInterpreterGenerator::generate_result_handler_for(
312 BasicType type) {
313 address entry = __ pc();
314 switch (type) {
315 case T_BOOLEAN: __ c2bool(rax); break;
316 #ifndef _LP64
317 case T_CHAR : __ andptr(rax, 0xFFFF); break;
318 #else
319 case T_CHAR : __ movzwl(rax, rax); break;
320 #endif // _LP64
321 case T_BYTE : __ sign_extend_byte(rax); break;
322 case T_SHORT : __ sign_extend_short(rax); break;
323 case T_INT : /* nothing to do */ break;
324 case T_LONG : /* nothing to do */ break;
325 case T_VOID : /* nothing to do */ break;
326 #ifndef _LP64
327 case T_DOUBLE :
328 case T_FLOAT :
329 { const Register t = InterpreterRuntime::SignatureHandlerGenerator::temp();
330 __ pop(t); // remove return address first
331 // Must return a result for interpreter or compiler. In SSE
332 // mode, results are returned in xmm0 and the FPU stack must
333 // be empty.
334 if (type == T_FLOAT && UseSSE >= 1) {
335 // Load ST0
336 __ fld_d(Address(rsp, 0));
337 // Store as float and empty fpu stack
338 __ fstp_s(Address(rsp, 0));
339 // and reload
340 __ movflt(xmm0, Address(rsp, 0));
341 } else if (type == T_DOUBLE && UseSSE >= 2 ) {
342 __ movdbl(xmm0, Address(rsp, 0));
343 } else {
344 // restore ST0
345 __ fld_d(Address(rsp, 0));
346 }
347 // and pop the temp
348 __ addptr(rsp, 2 * wordSize);
349 __ push(t); // restore return address
350 }
351 break;
352 #else
353 case T_FLOAT : /* nothing to do */ break;
354 case T_DOUBLE : /* nothing to do */ break;
355 #endif // _LP64
356
357 case T_PRIMITIVE_OBJECT: // fall through (inline types are handled with oops)
358 case T_OBJECT :
359 // retrieve result from frame
360 __ movptr(rax, Address(rbp, frame::interpreter_frame_oop_temp_offset*wordSize));
361 // and verify it
362 __ verify_oop(rax);
363 break;
364 default : ShouldNotReachHere();
365 }
366 __ ret(0); // return from result handler
367 return entry;
368 }
369
370 address TemplateInterpreterGenerator::generate_safept_entry_for(
371 TosState state,
372 address runtime_entry) {
373 address entry = __ pc();
374 __ push(state);
375 __ call_VM(noreg, runtime_entry);
376 __ dispatch_via(vtos, Interpreter::_normal_table.table_for(vtos));
377 return entry;
378 }
379
380
381
382 // Helpers for commoning out cases in the various type of method entries.
383 //
384
385
386 // increment invocation count & check for overflow
387 //
388 // Note: checking for negative value instead of overflow
389 // so we have a 'sticky' overflow test
390 //
391 // rbx: method
392 // rcx: invocation counter
393 //
394 void TemplateInterpreterGenerator::generate_counter_incr(Label* overflow) {
395 Label done;
396 // Note: In tiered we increment either counters in Method* or in MDO depending if we're profiling or not.
397 Label no_mdo;
398 if (ProfileInterpreter) {
399 // Are we profiling?
400 __ movptr(rax, Address(rbx, Method::method_data_offset()));
401 __ testptr(rax, rax);
402 __ jccb(Assembler::zero, no_mdo);
403 // Increment counter in the MDO
404 const Address mdo_invocation_counter(rax, in_bytes(MethodData::invocation_counter_offset()) +
405 in_bytes(InvocationCounter::counter_offset()));
406 const Address mask(rax, in_bytes(MethodData::invoke_mask_offset()));
407 __ increment_mask_and_jump(mdo_invocation_counter, mask, rcx, overflow);
408 __ jmp(done);
409 }
410 __ bind(no_mdo);
411 // Increment counter in MethodCounters
412 const Address invocation_counter(rax,
413 MethodCounters::invocation_counter_offset() +
414 InvocationCounter::counter_offset());
415 __ get_method_counters(rbx, rax, done);
416 const Address mask(rax, in_bytes(MethodCounters::invoke_mask_offset()));
417 __ increment_mask_and_jump(invocation_counter, mask, rcx, overflow);
418 __ bind(done);
419 }
420
421 void TemplateInterpreterGenerator::generate_counter_overflow(Label& do_continue) {
422
423 // Asm interpreter on entry
424 // r14/rdi - locals
425 // r13/rsi - bcp
426 // rbx - method
427 // rdx - cpool --- DOES NOT APPEAR TO BE TRUE
428 // rbp - interpreter frame
429
430 // On return (i.e. jump to entry_point) [ back to invocation of interpreter ]
431 // Everything as it was on entry
432 // rdx is not restored. Doesn't appear to really be set.
433
434 // InterpreterRuntime::frequency_counter_overflow takes two
435 // arguments, the first (thread) is passed by call_VM, the second
436 // indicates if the counter overflow occurs at a backwards branch
437 // (NULL bcp). We pass zero for it. The call returns the address
438 // of the verified entry point for the method or NULL if the
439 // compilation did not complete (either went background or bailed
440 // out).
441 Register rarg = NOT_LP64(rax) LP64_ONLY(c_rarg1);
442 __ movl(rarg, 0);
443 __ call_VM(noreg,
444 CAST_FROM_FN_PTR(address,
445 InterpreterRuntime::frequency_counter_overflow),
446 rarg);
447
448 __ movptr(rbx, Address(rbp, method_offset)); // restore Method*
449 // Preserve invariant that r13/r14 contain bcp/locals of sender frame
450 // and jump to the interpreted entry.
451 __ jmp(do_continue, relocInfo::none);
452 }
453
454 // See if we've got enough room on the stack for locals plus overhead below
455 // JavaThread::stack_overflow_limit(). If not, throw a StackOverflowError
456 // without going through the signal handler, i.e., reserved and yellow zones
457 // will not be made usable. The shadow zone must suffice to handle the
458 // overflow.
459 // The expression stack grows down incrementally, so the normal guard
460 // page mechanism will work for that.
461 //
462 // NOTE: Since the additional locals are also always pushed (wasn't
463 // obvious in generate_fixed_frame) so the guard should work for them
464 // too.
465 //
466 // Args:
467 // rdx: number of additional locals this frame needs (what we must check)
468 // rbx: Method*
469 //
470 // Kills:
471 // rax
472 void TemplateInterpreterGenerator::generate_stack_overflow_check(void) {
473
474 // monitor entry size: see picture of stack in frame_x86.hpp
475 const int entry_size = frame::interpreter_frame_monitor_size() * wordSize;
476
477 // total overhead size: entry_size + (saved rbp through expr stack
478 // bottom). be sure to change this if you add/subtract anything
479 // to/from the overhead area
480 const int overhead_size =
481 -(frame::interpreter_frame_initial_sp_offset * wordSize) + entry_size;
482
483 const int page_size = os::vm_page_size();
484
485 Label after_frame_check;
486
487 // see if the frame is greater than one page in size. If so,
488 // then we need to verify there is enough stack space remaining
489 // for the additional locals.
490 __ cmpl(rdx, (page_size - overhead_size) / Interpreter::stackElementSize);
491 __ jcc(Assembler::belowEqual, after_frame_check);
492
493 // compute rsp as if this were going to be the last frame on
494 // the stack before the red zone
495
496 Label after_frame_check_pop;
497 const Register thread = NOT_LP64(rsi) LP64_ONLY(r15_thread);
498 #ifndef _LP64
499 __ push(thread);
500 __ get_thread(thread);
501 #endif
502
503 const Address stack_limit(thread, JavaThread::stack_overflow_limit_offset());
504
505 // locals + overhead, in bytes
506 __ mov(rax, rdx);
507 __ shlptr(rax, Interpreter::logStackElementSize); // Convert parameter count to bytes.
508 __ addptr(rax, overhead_size);
509
510 #ifdef ASSERT
511 Label limit_okay;
512 // Verify that thread stack overflow limit is non-zero.
513 __ cmpptr(stack_limit, (int32_t)NULL_WORD);
514 __ jcc(Assembler::notEqual, limit_okay);
515 __ stop("stack overflow limit is zero");
516 __ bind(limit_okay);
517 #endif
518
519 // Add locals/frame size to stack limit.
520 __ addptr(rax, stack_limit);
521
522 // Check against the current stack bottom.
523 __ cmpptr(rsp, rax);
524
525 __ jcc(Assembler::above, after_frame_check_pop);
526 NOT_LP64(__ pop(rsi)); // get saved bcp
527
528 // Restore sender's sp as SP. This is necessary if the sender's
529 // frame is an extended compiled frame (see gen_c2i_adapter())
530 // and safer anyway in case of JSR292 adaptations.
531
532 __ pop(rax); // return address must be moved if SP is changed
533 __ mov(rsp, rbcp);
534 __ push(rax);
535
536 // Note: the restored frame is not necessarily interpreted.
537 // Use the shared runtime version of the StackOverflowError.
538 assert(StubRoutines::throw_StackOverflowError_entry() != NULL, "stub not yet generated");
539 __ jump(ExternalAddress(StubRoutines::throw_StackOverflowError_entry()));
540 // all done with frame size check
541 __ bind(after_frame_check_pop);
542 NOT_LP64(__ pop(rsi));
543
544 // all done with frame size check
545 __ bind(after_frame_check);
546 }
547
548 // Allocate monitor and lock method (asm interpreter)
549 //
550 // Args:
551 // rbx: Method*
552 // r14/rdi: locals
553 //
554 // Kills:
555 // rax
556 // c_rarg0, c_rarg1, c_rarg2, c_rarg3, ...(param regs)
557 // rscratch1, rscratch2 (scratch regs)
558 void TemplateInterpreterGenerator::lock_method() {
559 // synchronize method
560 const Address access_flags(rbx, Method::access_flags_offset());
561 const Address monitor_block_top(
562 rbp,
563 frame::interpreter_frame_monitor_block_top_offset * wordSize);
564 const int entry_size = frame::interpreter_frame_monitor_size() * wordSize;
565
566 #ifdef ASSERT
567 {
568 Label L;
569 __ movl(rax, access_flags);
570 __ testl(rax, JVM_ACC_SYNCHRONIZED);
571 __ jcc(Assembler::notZero, L);
572 __ stop("method doesn't need synchronization");
573 __ bind(L);
574 }
575 #endif // ASSERT
576
577 // get synchronization object
578 {
579 Label done;
580 __ movl(rax, access_flags);
581 __ testl(rax, JVM_ACC_STATIC);
582 // get receiver (assume this is frequent case)
583 __ movptr(rax, Address(rlocals, Interpreter::local_offset_in_bytes(0)));
584 __ jcc(Assembler::zero, done);
585 __ load_mirror(rax, rbx);
586
587 #ifdef ASSERT
588 {
589 Label L;
590 __ testptr(rax, rax);
591 __ jcc(Assembler::notZero, L);
592 __ stop("synchronization object is NULL");
593 __ bind(L);
594 }
595 #endif // ASSERT
596
597 __ bind(done);
598 }
599
600 // add space for monitor & lock
601 __ subptr(rsp, entry_size); // add space for a monitor entry
602 __ movptr(monitor_block_top, rsp); // set new monitor block top
603 // store object
604 __ movptr(Address(rsp, BasicObjectLock::obj_offset_in_bytes()), rax);
605 const Register lockreg = NOT_LP64(rdx) LP64_ONLY(c_rarg1);
606 __ movptr(lockreg, rsp); // object address
607 __ lock_object(lockreg);
608 }
609
610 // Generate a fixed interpreter frame. This is identical setup for
611 // interpreted methods and for native methods hence the shared code.
612 //
613 // Args:
614 // rax: return address
615 // rbx: Method*
616 // r14/rdi: pointer to locals
617 // r13/rsi: sender sp
618 // rdx: cp cache
619 void TemplateInterpreterGenerator::generate_fixed_frame(bool native_call) {
620 // initialize fixed part of activation frame
621 __ push(rax); // save return address
622 __ enter(); // save old & set new rbp
623 __ push(rbcp); // set sender sp
624 __ push((int)NULL_WORD); // leave last_sp as null
625 __ movptr(rbcp, Address(rbx, Method::const_offset())); // get ConstMethod*
626 __ lea(rbcp, Address(rbcp, ConstMethod::codes_offset())); // get codebase
627 __ push(rbx); // save Method*
628 // Get mirror and store it in the frame as GC root for this Method*
629 __ load_mirror(rdx, rbx);
630 __ push(rdx);
631 if (ProfileInterpreter) {
632 Label method_data_continue;
633 __ movptr(rdx, Address(rbx, in_bytes(Method::method_data_offset())));
634 __ testptr(rdx, rdx);
635 __ jcc(Assembler::zero, method_data_continue);
636 __ addptr(rdx, in_bytes(MethodData::data_offset()));
637 __ bind(method_data_continue);
638 __ push(rdx); // set the mdp (method data pointer)
639 } else {
640 __ push(0);
641 }
642
643 __ movptr(rdx, Address(rbx, Method::const_offset()));
644 __ movptr(rdx, Address(rdx, ConstMethod::constants_offset()));
645 __ movptr(rdx, Address(rdx, ConstantPool::cache_offset_in_bytes()));
646 __ push(rdx); // set constant pool cache
647 __ push(rlocals); // set locals pointer
648 if (native_call) {
649 __ push(0); // no bcp
650 } else {
651 __ push(rbcp); // set bcp
652 }
653 __ push(0); // reserve word for pointer to expression stack bottom
654 __ movptr(Address(rsp, 0), rsp); // set expression stack bottom
655 }
656
657 // End of helpers
658
659 // Method entry for java.lang.ref.Reference.get.
660 address TemplateInterpreterGenerator::generate_Reference_get_entry(void) {
661 // Code: _aload_0, _getfield, _areturn
662 // parameter size = 1
663 //
664 // The code that gets generated by this routine is split into 2 parts:
665 // 1. The "intrinsified" code performing an ON_WEAK_OOP_REF load,
666 // 2. The slow path - which is an expansion of the regular method entry.
667 //
668 // Notes:-
669 // * An intrinsic is always executed, where an ON_WEAK_OOP_REF load is performed.
670 // * We may jump to the slow path iff the receiver is null. If the
671 // Reference object is null then we no longer perform an ON_WEAK_OOP_REF load
672 // Thus we can use the regular method entry code to generate the NPE.
673 //
674 // rbx: Method*
675
676 // r13: senderSP must preserve for slow path, set SP to it on fast path
677
678 address entry = __ pc();
679
680 const int referent_offset = java_lang_ref_Reference::referent_offset();
681
682 Label slow_path;
683 // rbx: method
684
685 // Check if local 0 != NULL
686 // If the receiver is null then it is OK to jump to the slow path.
687 __ movptr(rax, Address(rsp, wordSize));
688
689 __ testptr(rax, rax);
690 __ jcc(Assembler::zero, slow_path);
691
692 // rax: local 0
693 // rbx: method (but can be used as scratch now)
694 // rdx: scratch
695 // rdi: scratch
696
697 // Preserve the sender sp in case the load barrier
698 // calls the runtime
699 NOT_LP64(__ push(rsi));
700
701 // Load the value of the referent field.
702 const Address field_address(rax, referent_offset);
703 __ load_heap_oop(rax, field_address, /*tmp1*/ rbx, /*tmp_thread*/ rdx, ON_WEAK_OOP_REF);
704
705 // _areturn
706 const Register sender_sp = NOT_LP64(rsi) LP64_ONLY(r13);
707 NOT_LP64(__ pop(rsi)); // get sender sp
708 __ pop(rdi); // get return address
709 __ mov(rsp, sender_sp); // set sp to sender sp
710 __ jmp(rdi);
711 __ ret(0);
712
713 // generate a vanilla interpreter entry as the slow path
714 __ bind(slow_path);
715 __ jump_to_entry(Interpreter::entry_for_kind(Interpreter::zerolocals));
716 return entry;
717 }
718
719 void TemplateInterpreterGenerator::bang_stack_shadow_pages(bool native_call) {
720 // See more discussion in stackOverflow.hpp.
721
722 // Note that we do the banging after the frame is setup, since the exception
723 // handling code expects to find a valid interpreter frame on the stack.
724 // Doing the banging earlier fails if the caller frame is not an interpreter
725 // frame.
726 // (Also, the exception throwing code expects to unlock any synchronized
727 // method receiver, so do the banging after locking the receiver.)
728
729 const int shadow_zone_size = checked_cast<int>(StackOverflow::stack_shadow_zone_size());
730 const int page_size = os::vm_page_size();
731 const int n_shadow_pages = shadow_zone_size / page_size;
732
733 const Register thread = NOT_LP64(rsi) LP64_ONLY(r15_thread);
734 #ifndef _LP64
735 __ push(thread);
736 __ get_thread(thread);
737 #endif
738
739 #ifdef ASSERT
740 Label L_good_limit;
741 __ cmpptr(Address(thread, JavaThread::shadow_zone_safe_limit()), (int32_t)NULL_WORD);
742 __ jcc(Assembler::notEqual, L_good_limit);
743 __ stop("shadow zone safe limit is not initialized");
744 __ bind(L_good_limit);
745
746 Label L_good_watermark;
747 __ cmpptr(Address(thread, JavaThread::shadow_zone_growth_watermark()), (int32_t)NULL_WORD);
748 __ jcc(Assembler::notEqual, L_good_watermark);
749 __ stop("shadow zone growth watermark is not initialized");
750 __ bind(L_good_watermark);
751 #endif
752
753 Label L_done;
754
755 __ cmpptr(rsp, Address(thread, JavaThread::shadow_zone_growth_watermark()));
756 __ jcc(Assembler::above, L_done);
757
758 for (int p = 1; p <= n_shadow_pages; p++) {
759 __ bang_stack_with_offset(p*page_size);
760 }
761
762 // Record the new watermark, but only if update is above the safe limit.
763 // Otherwise, the next time around the check above would pass the safe limit.
764 __ cmpptr(rsp, Address(thread, JavaThread::shadow_zone_safe_limit()));
765 __ jccb(Assembler::belowEqual, L_done);
766 __ movptr(Address(thread, JavaThread::shadow_zone_growth_watermark()), rsp);
767
768 __ bind(L_done);
769
770 #ifndef _LP64
771 __ pop(thread);
772 #endif
773 }
774
775 // Interpreter stub for calling a native method. (asm interpreter)
776 // This sets up a somewhat different looking stack for calling the
777 // native method than the typical interpreter frame setup.
778 address TemplateInterpreterGenerator::generate_native_entry(bool synchronized) {
779 // determine code generation flags
780 bool inc_counter = UseCompiler || CountCompiledCalls || LogTouchedMethods;
781
782 // rbx: Method*
783 // rbcp: sender sp
784
785 address entry_point = __ pc();
786
787 const Address constMethod (rbx, Method::const_offset());
788 const Address access_flags (rbx, Method::access_flags_offset());
789 const Address size_of_parameters(rcx, ConstMethod::
790 size_of_parameters_offset());
791
792
793 // get parameter size (always needed)
794 __ movptr(rcx, constMethod);
795 __ load_unsigned_short(rcx, size_of_parameters);
796
797 // native calls don't need the stack size check since they have no
798 // expression stack and the arguments are already on the stack and
799 // we only add a handful of words to the stack
800
801 // rbx: Method*
802 // rcx: size of parameters
803 // rbcp: sender sp
804 __ pop(rax); // get return address
805
806 // for natives the size of locals is zero
807
808 // compute beginning of parameters
809 __ lea(rlocals, Address(rsp, rcx, Interpreter::stackElementScale(), -wordSize));
810
811 // add 2 zero-initialized slots for native calls
812 // initialize result_handler slot
813 __ push((int) NULL_WORD);
814 // slot for oop temp
815 // (static native method holder mirror/jni oop result)
816 __ push((int) NULL_WORD);
817
818 // initialize fixed part of activation frame
819 generate_fixed_frame(true);
820
821 // make sure method is native & not abstract
822 #ifdef ASSERT
823 __ movl(rax, access_flags);
824 {
825 Label L;
826 __ testl(rax, JVM_ACC_NATIVE);
827 __ jcc(Assembler::notZero, L);
828 __ stop("tried to execute non-native method as native");
829 __ bind(L);
830 }
831 {
832 Label L;
833 __ testl(rax, JVM_ACC_ABSTRACT);
834 __ jcc(Assembler::zero, L);
835 __ stop("tried to execute abstract method in interpreter");
836 __ bind(L);
837 }
838 #endif
839
840 // Since at this point in the method invocation the exception handler
841 // would try to exit the monitor of synchronized methods which hasn't
842 // been entered yet, we set the thread local variable
843 // _do_not_unlock_if_synchronized to true. The remove_activation will
844 // check this flag.
845
846 const Register thread1 = NOT_LP64(rax) LP64_ONLY(r15_thread);
847 NOT_LP64(__ get_thread(thread1));
848 const Address do_not_unlock_if_synchronized(thread1,
849 in_bytes(JavaThread::do_not_unlock_if_synchronized_offset()));
850 __ movbool(do_not_unlock_if_synchronized, true);
851
852 // increment invocation count & check for overflow
853 Label invocation_counter_overflow;
854 if (inc_counter) {
855 generate_counter_incr(&invocation_counter_overflow);
856 }
857
858 Label continue_after_compile;
859 __ bind(continue_after_compile);
860
861 bang_stack_shadow_pages(true);
862
863 // reset the _do_not_unlock_if_synchronized flag
864 NOT_LP64(__ get_thread(thread1));
865 __ movbool(do_not_unlock_if_synchronized, false);
866
867 // check for synchronized methods
868 // Must happen AFTER invocation_counter check and stack overflow check,
869 // so method is not locked if overflows.
870 if (synchronized) {
871 lock_method();
872 } else {
873 // no synchronization necessary
874 #ifdef ASSERT
875 {
876 Label L;
877 __ movl(rax, access_flags);
878 __ testl(rax, JVM_ACC_SYNCHRONIZED);
879 __ jcc(Assembler::zero, L);
880 __ stop("method needs synchronization");
881 __ bind(L);
882 }
883 #endif
884 }
885
886 // start execution
887 #ifdef ASSERT
888 {
889 Label L;
890 const Address monitor_block_top(rbp,
891 frame::interpreter_frame_monitor_block_top_offset * wordSize);
892 __ movptr(rax, monitor_block_top);
893 __ cmpptr(rax, rsp);
894 __ jcc(Assembler::equal, L);
895 __ stop("broken stack frame setup in interpreter");
896 __ bind(L);
897 }
898 #endif
899
900 // jvmti support
901 __ notify_method_entry();
902
903 // work registers
904 const Register method = rbx;
905 const Register thread = NOT_LP64(rdi) LP64_ONLY(r15_thread);
906 const Register t = NOT_LP64(rcx) LP64_ONLY(r11);
907
908 // allocate space for parameters
909 __ get_method(method);
910 __ movptr(t, Address(method, Method::const_offset()));
911 __ load_unsigned_short(t, Address(t, ConstMethod::size_of_parameters_offset()));
912
913 #ifndef _LP64
914 __ shlptr(t, Interpreter::logStackElementSize); // Convert parameter count to bytes.
915 __ addptr(t, 2*wordSize); // allocate two more slots for JNIEnv and possible mirror
916 __ subptr(rsp, t);
917 __ andptr(rsp, -(StackAlignmentInBytes)); // gcc needs 16 byte aligned stacks to do XMM intrinsics
918 #else
919 __ shll(t, Interpreter::logStackElementSize);
920
921 __ subptr(rsp, t);
922 __ subptr(rsp, frame::arg_reg_save_area_bytes); // windows
923 __ andptr(rsp, -16); // must be 16 byte boundary (see amd64 ABI)
924 #endif // _LP64
925
926 // get signature handler
927 {
928 Label L;
929 __ movptr(t, Address(method, Method::signature_handler_offset()));
930 __ testptr(t, t);
931 __ jcc(Assembler::notZero, L);
932 __ call_VM(noreg,
933 CAST_FROM_FN_PTR(address,
934 InterpreterRuntime::prepare_native_call),
935 method);
936 __ get_method(method);
937 __ movptr(t, Address(method, Method::signature_handler_offset()));
938 __ bind(L);
939 }
940
941 // call signature handler
942 assert(InterpreterRuntime::SignatureHandlerGenerator::from() == rlocals,
943 "adjust this code");
944 assert(InterpreterRuntime::SignatureHandlerGenerator::to() == rsp,
945 "adjust this code");
946 assert(InterpreterRuntime::SignatureHandlerGenerator::temp() == NOT_LP64(t) LP64_ONLY(rscratch1),
947 "adjust this code");
948
949 // The generated handlers do not touch RBX (the method).
950 // However, large signatures cannot be cached and are generated
951 // each time here. The slow-path generator can do a GC on return,
952 // so we must reload it after the call.
953 __ call(t);
954 __ get_method(method); // slow path can do a GC, reload RBX
955
956
957 // result handler is in rax
958 // set result handler
959 __ movptr(Address(rbp,
960 (frame::interpreter_frame_result_handler_offset) * wordSize),
961 rax);
962
963 // pass mirror handle if static call
964 {
965 Label L;
966 __ movl(t, Address(method, Method::access_flags_offset()));
967 __ testl(t, JVM_ACC_STATIC);
968 __ jcc(Assembler::zero, L);
969 // get mirror
970 __ load_mirror(t, method, rax);
971 // copy mirror into activation frame
972 __ movptr(Address(rbp, frame::interpreter_frame_oop_temp_offset * wordSize),
973 t);
974 // pass handle to mirror
975 #ifndef _LP64
976 __ lea(t, Address(rbp, frame::interpreter_frame_oop_temp_offset * wordSize));
977 __ movptr(Address(rsp, wordSize), t);
978 #else
979 __ lea(c_rarg1,
980 Address(rbp, frame::interpreter_frame_oop_temp_offset * wordSize));
981 #endif // _LP64
982 __ bind(L);
983 }
984
985 // get native function entry point
986 {
987 Label L;
988 __ movptr(rax, Address(method, Method::native_function_offset()));
989 ExternalAddress unsatisfied(SharedRuntime::native_method_throw_unsatisfied_link_error_entry());
990 __ cmpptr(rax, unsatisfied.addr());
991 __ jcc(Assembler::notEqual, L);
992 __ call_VM(noreg,
993 CAST_FROM_FN_PTR(address,
994 InterpreterRuntime::prepare_native_call),
995 method);
996 __ get_method(method);
997 __ movptr(rax, Address(method, Method::native_function_offset()));
998 __ bind(L);
999 }
1000
1001 // pass JNIEnv
1002 #ifndef _LP64
1003 __ get_thread(thread);
1004 __ lea(t, Address(thread, JavaThread::jni_environment_offset()));
1005 __ movptr(Address(rsp, 0), t);
1006
1007 // set_last_Java_frame_before_call
1008 // It is enough that the pc()
1009 // points into the right code segment. It does not have to be the correct return pc.
1010 __ set_last_Java_frame(thread, noreg, rbp, __ pc());
1011 #else
1012 __ lea(c_rarg0, Address(r15_thread, JavaThread::jni_environment_offset()));
1013
1014 // It is enough that the pc() points into the right code
1015 // segment. It does not have to be the correct return pc.
1016 __ set_last_Java_frame(rsp, rbp, (address) __ pc());
1017 #endif // _LP64
1018
1019 // change thread state
1020 #ifdef ASSERT
1021 {
1022 Label L;
1023 __ movl(t, Address(thread, JavaThread::thread_state_offset()));
1024 __ cmpl(t, _thread_in_Java);
1025 __ jcc(Assembler::equal, L);
1026 __ stop("Wrong thread state in native stub");
1027 __ bind(L);
1028 }
1029 #endif
1030
1031 // Change state to native
1032
1033 __ movl(Address(thread, JavaThread::thread_state_offset()),
1034 _thread_in_native);
1035
1036 // Call the native method.
1037 __ call(rax);
1038 // 32: result potentially in rdx:rax or ST0
1039 // 64: result potentially in rax or xmm0
1040
1041 // Verify or restore cpu control state after JNI call
1042 __ restore_cpu_control_state_after_jni();
1043
1044 // NOTE: The order of these pushes is known to frame::interpreter_frame_result
1045 // in order to extract the result of a method call. If the order of these
1046 // pushes change or anything else is added to the stack then the code in
1047 // interpreter_frame_result must also change.
1048
1049 #ifndef _LP64
1050 // save potential result in ST(0) & rdx:rax
1051 // (if result handler is the T_FLOAT or T_DOUBLE handler, result must be in ST0 -
1052 // the check is necessary to avoid potential Intel FPU overflow problems by saving/restoring 'empty' FPU registers)
1053 // It is safe to do this push because state is _thread_in_native and return address will be found
1054 // via _last_native_pc and not via _last_jave_sp
1055
1056 // NOTE: the order of theses push(es) is known to frame::interpreter_frame_result.
1057 // If the order changes or anything else is added to the stack the code in
1058 // interpreter_frame_result will have to be changed.
1059
1060 { Label L;
1061 Label push_double;
1062 ExternalAddress float_handler(AbstractInterpreter::result_handler(T_FLOAT));
1063 ExternalAddress double_handler(AbstractInterpreter::result_handler(T_DOUBLE));
1064 __ cmpptr(Address(rbp, (frame::interpreter_frame_oop_temp_offset + 1)*wordSize),
1065 float_handler.addr());
1066 __ jcc(Assembler::equal, push_double);
1067 __ cmpptr(Address(rbp, (frame::interpreter_frame_oop_temp_offset + 1)*wordSize),
1068 double_handler.addr());
1069 __ jcc(Assembler::notEqual, L);
1070 __ bind(push_double);
1071 __ push_d(); // FP values are returned using the FPU, so push FPU contents (even if UseSSE > 0).
1072 __ bind(L);
1073 }
1074 #else
1075 __ push(dtos);
1076 #endif // _LP64
1077
1078 __ push(ltos);
1079
1080 // change thread state
1081 NOT_LP64(__ get_thread(thread));
1082 __ movl(Address(thread, JavaThread::thread_state_offset()),
1083 _thread_in_native_trans);
1084
1085 // Force this write out before the read below
1086 __ membar(Assembler::Membar_mask_bits(
1087 Assembler::LoadLoad | Assembler::LoadStore |
1088 Assembler::StoreLoad | Assembler::StoreStore));
1089
1090 #ifndef _LP64
1091 if (AlwaysRestoreFPU) {
1092 // Make sure the control word is correct.
1093 __ fldcw(ExternalAddress(StubRoutines::x86::addr_fpu_cntrl_wrd_std()));
1094 }
1095 #endif // _LP64
1096
1097 // check for safepoint operation in progress and/or pending suspend requests
1098 {
1099 Label Continue;
1100 Label slow_path;
1101
1102 __ safepoint_poll(slow_path, thread, true /* at_return */, false /* in_nmethod */);
1103
1104 __ cmpl(Address(thread, JavaThread::suspend_flags_offset()), 0);
1105 __ jcc(Assembler::equal, Continue);
1106 __ bind(slow_path);
1107
1108 // Don't use call_VM as it will see a possible pending exception
1109 // and forward it and never return here preventing us from
1110 // clearing _last_native_pc down below. Also can't use
1111 // call_VM_leaf either as it will check to see if r13 & r14 are
1112 // preserved and correspond to the bcp/locals pointers. So we do a
1113 // runtime call by hand.
1114 //
1115 #ifndef _LP64
1116 __ push(thread);
1117 __ call(RuntimeAddress(CAST_FROM_FN_PTR(address,
1118 JavaThread::check_special_condition_for_native_trans)));
1119 __ increment(rsp, wordSize);
1120 __ get_thread(thread);
1121 #else
1122 __ mov(c_rarg0, r15_thread);
1123 __ mov(r12, rsp); // remember sp (can only use r12 if not using call_VM)
1124 __ subptr(rsp, frame::arg_reg_save_area_bytes); // windows
1125 __ andptr(rsp, -16); // align stack as required by ABI
1126 __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, JavaThread::check_special_condition_for_native_trans)));
1127 __ mov(rsp, r12); // restore sp
1128 __ reinit_heapbase();
1129 #endif // _LP64
1130 __ bind(Continue);
1131 }
1132
1133 // change thread state
1134 __ movl(Address(thread, JavaThread::thread_state_offset()), _thread_in_Java);
1135
1136 // reset_last_Java_frame
1137 __ reset_last_Java_frame(thread, true);
1138
1139 if (CheckJNICalls) {
1140 // clear_pending_jni_exception_check
1141 __ movptr(Address(thread, JavaThread::pending_jni_exception_check_fn_offset()), NULL_WORD);
1142 }
1143
1144 // reset handle block
1145 __ movptr(t, Address(thread, JavaThread::active_handles_offset()));
1146 __ movl(Address(t, JNIHandleBlock::top_offset_in_bytes()), (int32_t)NULL_WORD);
1147
1148 // If result is an oop unbox and store it in frame where gc will see it
1149 // and result handler will pick it up
1150
1151 {
1152 Label no_oop;
1153 __ lea(t, ExternalAddress(AbstractInterpreter::result_handler(T_OBJECT)));
1154 __ cmpptr(t, Address(rbp, frame::interpreter_frame_result_handler_offset*wordSize));
1155 __ jcc(Assembler::notEqual, no_oop);
1156 // retrieve result
1157 __ pop(ltos);
1158 // Unbox oop result, e.g. JNIHandles::resolve value.
1159 __ resolve_jobject(rax /* value */,
1160 thread /* thread */,
1161 t /* tmp */);
1162 __ movptr(Address(rbp, frame::interpreter_frame_oop_temp_offset*wordSize), rax);
1163 // keep stack depth as expected by pushing oop which will eventually be discarded
1164 __ push(ltos);
1165 __ bind(no_oop);
1166 }
1167
1168
1169 {
1170 Label no_reguard;
1171 __ cmpl(Address(thread, JavaThread::stack_guard_state_offset()),
1172 StackOverflow::stack_guard_yellow_reserved_disabled);
1173 __ jcc(Assembler::notEqual, no_reguard);
1174
1175 __ pusha(); // XXX only save smashed registers
1176 #ifndef _LP64
1177 __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, SharedRuntime::reguard_yellow_pages)));
1178 __ popa();
1179 #else
1180 __ mov(r12, rsp); // remember sp (can only use r12 if not using call_VM)
1181 __ subptr(rsp, frame::arg_reg_save_area_bytes); // windows
1182 __ andptr(rsp, -16); // align stack as required by ABI
1183 __ call(RuntimeAddress(CAST_FROM_FN_PTR(address, SharedRuntime::reguard_yellow_pages)));
1184 __ mov(rsp, r12); // restore sp
1185 __ popa(); // XXX only restore smashed registers
1186 __ reinit_heapbase();
1187 #endif // _LP64
1188
1189 __ bind(no_reguard);
1190 }
1191
1192
1193 // The method register is junk from after the thread_in_native transition
1194 // until here. Also can't call_VM until the bcp has been
1195 // restored. Need bcp for throwing exception below so get it now.
1196 __ get_method(method);
1197
1198 // restore to have legal interpreter frame, i.e., bci == 0 <=> code_base()
1199 __ movptr(rbcp, Address(method, Method::const_offset())); // get ConstMethod*
1200 __ lea(rbcp, Address(rbcp, ConstMethod::codes_offset())); // get codebase
1201
1202 // handle exceptions (exception handling will handle unlocking!)
1203 {
1204 Label L;
1205 __ cmpptr(Address(thread, Thread::pending_exception_offset()), (int32_t) NULL_WORD);
1206 __ jcc(Assembler::zero, L);
1207 // Note: At some point we may want to unify this with the code
1208 // used in call_VM_base(); i.e., we should use the
1209 // StubRoutines::forward_exception code. For now this doesn't work
1210 // here because the rsp is not correctly set at this point.
1211 __ MacroAssembler::call_VM(noreg,
1212 CAST_FROM_FN_PTR(address,
1213 InterpreterRuntime::throw_pending_exception));
1214 __ should_not_reach_here();
1215 __ bind(L);
1216 }
1217
1218 // do unlocking if necessary
1219 {
1220 Label L;
1221 __ movl(t, Address(method, Method::access_flags_offset()));
1222 __ testl(t, JVM_ACC_SYNCHRONIZED);
1223 __ jcc(Assembler::zero, L);
1224 // the code below should be shared with interpreter macro
1225 // assembler implementation
1226 {
1227 Label unlock;
1228 // BasicObjectLock will be first in list, since this is a
1229 // synchronized method. However, need to check that the object
1230 // has not been unlocked by an explicit monitorexit bytecode.
1231 const Address monitor(rbp,
1232 (intptr_t)(frame::interpreter_frame_initial_sp_offset *
1233 wordSize - (int)sizeof(BasicObjectLock)));
1234
1235 const Register regmon = NOT_LP64(rdx) LP64_ONLY(c_rarg1);
1236
1237 // monitor expect in c_rarg1 for slow unlock path
1238 __ lea(regmon, monitor); // address of first monitor
1239
1240 __ movptr(t, Address(regmon, BasicObjectLock::obj_offset_in_bytes()));
1241 __ testptr(t, t);
1242 __ jcc(Assembler::notZero, unlock);
1243
1244 // Entry already unlocked, need to throw exception
1245 __ MacroAssembler::call_VM(noreg,
1246 CAST_FROM_FN_PTR(address,
1247 InterpreterRuntime::throw_illegal_monitor_state_exception));
1248 __ should_not_reach_here();
1249
1250 __ bind(unlock);
1251 __ unlock_object(regmon);
1252 }
1253 __ bind(L);
1254 }
1255
1256 // jvmti support
1257 // Note: This must happen _after_ handling/throwing any exceptions since
1258 // the exception handler code notifies the runtime of method exits
1259 // too. If this happens before, method entry/exit notifications are
1260 // not properly paired (was bug - gri 11/22/99).
1261 __ notify_method_exit(vtos, InterpreterMacroAssembler::NotifyJVMTI);
1262
1263 // restore potential result in edx:eax, call result handler to
1264 // restore potential result in ST0 & handle result
1265
1266 __ pop(ltos);
1267 LP64_ONLY( __ pop(dtos));
1268
1269 __ movptr(t, Address(rbp,
1270 (frame::interpreter_frame_result_handler_offset) * wordSize));
1271 __ call(t);
1272
1273 // remove activation
1274 __ movptr(t, Address(rbp,
1275 frame::interpreter_frame_sender_sp_offset *
1276 wordSize)); // get sender sp
1277 __ leave(); // remove frame anchor
1278 __ pop(rdi); // get return address
1279 __ mov(rsp, t); // set sp to sender sp
1280 __ jmp(rdi);
1281
1282 if (inc_counter) {
1283 // Handle overflow of counter and compile method
1284 __ bind(invocation_counter_overflow);
1285 generate_counter_overflow(continue_after_compile);
1286 }
1287
1288 return entry_point;
1289 }
1290
1291 // Abstract method entry
1292 // Attempt to execute abstract method. Throw exception
1293 address TemplateInterpreterGenerator::generate_abstract_entry(void) {
1294
1295 address entry_point = __ pc();
1296
1297 // abstract method entry
1298
1299 // pop return address, reset last_sp to NULL
1300 __ empty_expression_stack();
1301 __ restore_bcp(); // rsi must be correct for exception handler (was destroyed)
1302 __ restore_locals(); // make sure locals pointer is correct as well (was destroyed)
1303
1304 // throw exception
1305 __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_AbstractMethodErrorWithMethod), rbx);
1306 // the call_VM checks for exception, so we should never return here.
1307 __ should_not_reach_here();
1308
1309 return entry_point;
1310 }
1311
1312 //
1313 // Generic interpreted method entry to (asm) interpreter
1314 //
1315 address TemplateInterpreterGenerator::generate_normal_entry(bool synchronized) {
1316 // determine code generation flags
1317 bool inc_counter = UseCompiler || CountCompiledCalls || LogTouchedMethods;
1318
1319 // ebx: Method*
1320 // rbcp: sender sp
1321 address entry_point = __ pc();
1322
1323 const Address constMethod(rbx, Method::const_offset());
1324 const Address access_flags(rbx, Method::access_flags_offset());
1325 const Address size_of_parameters(rdx,
1326 ConstMethod::size_of_parameters_offset());
1327 const Address size_of_locals(rdx, ConstMethod::size_of_locals_offset());
1328
1329
1330 // get parameter size (always needed)
1331 __ movptr(rdx, constMethod);
1332 __ load_unsigned_short(rcx, size_of_parameters);
1333
1334 // rbx: Method*
1335 // rcx: size of parameters
1336 // rbcp: sender_sp (could differ from sp+wordSize if we were called via c2i )
1337
1338 __ load_unsigned_short(rdx, size_of_locals); // get size of locals in words
1339 __ subl(rdx, rcx); // rdx = no. of additional locals
1340
1341 // YYY
1342 // __ incrementl(rdx);
1343 // __ andl(rdx, -2);
1344
1345 // see if we've got enough room on the stack for locals plus overhead.
1346 generate_stack_overflow_check();
1347
1348 // get return address
1349 __ pop(rax);
1350
1351 // compute beginning of parameters
1352 __ lea(rlocals, Address(rsp, rcx, Interpreter::stackElementScale(), -wordSize));
1353
1354 // rdx - # of additional locals
1355 // allocate space for locals
1356 // explicitly initialize locals
1357 {
1358 Label exit, loop;
1359 __ testl(rdx, rdx);
1360 __ jcc(Assembler::lessEqual, exit); // do nothing if rdx <= 0
1361 __ bind(loop);
1362 __ push((int) NULL_WORD); // initialize local variables
1363 __ decrementl(rdx); // until everything initialized
1364 __ jcc(Assembler::greater, loop);
1365 __ bind(exit);
1366 }
1367
1368 // initialize fixed part of activation frame
1369 generate_fixed_frame(false);
1370
1371 // make sure method is not native & not abstract
1372 #ifdef ASSERT
1373 __ movl(rax, access_flags);
1374 {
1375 Label L;
1376 __ testl(rax, JVM_ACC_NATIVE);
1377 __ jcc(Assembler::zero, L);
1378 __ stop("tried to execute native method as non-native");
1379 __ bind(L);
1380 }
1381 {
1382 Label L;
1383 __ testl(rax, JVM_ACC_ABSTRACT);
1384 __ jcc(Assembler::zero, L);
1385 __ stop("tried to execute abstract method in interpreter");
1386 __ bind(L);
1387 }
1388 #endif
1389
1390 // Since at this point in the method invocation the exception
1391 // handler would try to exit the monitor of synchronized methods
1392 // which hasn't been entered yet, we set the thread local variable
1393 // _do_not_unlock_if_synchronized to true. The remove_activation
1394 // will check this flag.
1395
1396 const Register thread = NOT_LP64(rax) LP64_ONLY(r15_thread);
1397 NOT_LP64(__ get_thread(thread));
1398 const Address do_not_unlock_if_synchronized(thread,
1399 in_bytes(JavaThread::do_not_unlock_if_synchronized_offset()));
1400 __ movbool(do_not_unlock_if_synchronized, true);
1401
1402 __ profile_parameters_type(rax, rcx, rdx);
1403 // increment invocation count & check for overflow
1404 Label invocation_counter_overflow;
1405 if (inc_counter) {
1406 generate_counter_incr(&invocation_counter_overflow);
1407 }
1408
1409 Label continue_after_compile;
1410 __ bind(continue_after_compile);
1411
1412 // check for synchronized interpreted methods
1413 bang_stack_shadow_pages(false);
1414
1415 // reset the _do_not_unlock_if_synchronized flag
1416 NOT_LP64(__ get_thread(thread));
1417 __ movbool(do_not_unlock_if_synchronized, false);
1418
1419 // check for synchronized methods
1420 // Must happen AFTER invocation_counter check and stack overflow check,
1421 // so method is not locked if overflows.
1422 if (synchronized) {
1423 // Allocate monitor and lock method
1424 lock_method();
1425 } else {
1426 // no synchronization necessary
1427 #ifdef ASSERT
1428 {
1429 Label L;
1430 __ movl(rax, access_flags);
1431 __ testl(rax, JVM_ACC_SYNCHRONIZED);
1432 __ jcc(Assembler::zero, L);
1433 __ stop("method needs synchronization");
1434 __ bind(L);
1435 }
1436 #endif
1437 }
1438
1439 // start execution
1440 #ifdef ASSERT
1441 {
1442 Label L;
1443 const Address monitor_block_top (rbp,
1444 frame::interpreter_frame_monitor_block_top_offset * wordSize);
1445 __ movptr(rax, monitor_block_top);
1446 __ cmpptr(rax, rsp);
1447 __ jcc(Assembler::equal, L);
1448 __ stop("broken stack frame setup in interpreter");
1449 __ bind(L);
1450 }
1451 #endif
1452
1453 // jvmti support
1454 __ notify_method_entry();
1455
1456 __ dispatch_next(vtos);
1457
1458 // invocation counter overflow
1459 if (inc_counter) {
1460 // Handle overflow of counter and compile method
1461 __ bind(invocation_counter_overflow);
1462 generate_counter_overflow(continue_after_compile);
1463 }
1464
1465 return entry_point;
1466 }
1467
1468 //-----------------------------------------------------------------------------
1469 // Exceptions
1470
1471 void TemplateInterpreterGenerator::generate_throw_exception() {
1472 // Entry point in previous activation (i.e., if the caller was
1473 // interpreted)
1474 Interpreter::_rethrow_exception_entry = __ pc();
1475 // Restore sp to interpreter_frame_last_sp even though we are going
1476 // to empty the expression stack for the exception processing.
1477 __ movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), (int32_t)NULL_WORD);
1478 // rax: exception
1479 // rdx: return address/pc that threw exception
1480 __ restore_bcp(); // r13/rsi points to call/send
1481 __ restore_locals();
1482 LP64_ONLY(__ reinit_heapbase()); // restore r12 as heapbase.
1483 // Entry point for exceptions thrown within interpreter code
1484 Interpreter::_throw_exception_entry = __ pc();
1485 // expression stack is undefined here
1486 // rax: exception
1487 // r13/rsi: exception bcp
1488 __ verify_oop(rax);
1489 Register rarg = NOT_LP64(rax) LP64_ONLY(c_rarg1);
1490 LP64_ONLY(__ mov(c_rarg1, rax));
1491
1492 // expression stack must be empty before entering the VM in case of
1493 // an exception
1494 __ empty_expression_stack();
1495 // find exception handler address and preserve exception oop
1496 __ call_VM(rdx,
1497 CAST_FROM_FN_PTR(address,
1498 InterpreterRuntime::exception_handler_for_exception),
1499 rarg);
1500 // rax: exception handler entry point
1501 // rdx: preserved exception oop
1502 // r13/rsi: bcp for exception handler
1503 __ push_ptr(rdx); // push exception which is now the only value on the stack
1504 __ jmp(rax); // jump to exception handler (may be _remove_activation_entry!)
1505
1506 // If the exception is not handled in the current frame the frame is
1507 // removed and the exception is rethrown (i.e. exception
1508 // continuation is _rethrow_exception).
1509 //
1510 // Note: At this point the bci is still the bxi for the instruction
1511 // which caused the exception and the expression stack is
1512 // empty. Thus, for any VM calls at this point, GC will find a legal
1513 // oop map (with empty expression stack).
1514
1515 // In current activation
1516 // tos: exception
1517 // esi: exception bcp
1518
1519 //
1520 // JVMTI PopFrame support
1521 //
1522
1523 Interpreter::_remove_activation_preserving_args_entry = __ pc();
1524 __ empty_expression_stack();
1525 // Set the popframe_processing bit in pending_popframe_condition
1526 // indicating that we are currently handling popframe, so that
1527 // call_VMs that may happen later do not trigger new popframe
1528 // handling cycles.
1529 const Register thread = NOT_LP64(rcx) LP64_ONLY(r15_thread);
1530 NOT_LP64(__ get_thread(thread));
1531 __ movl(rdx, Address(thread, JavaThread::popframe_condition_offset()));
1532 __ orl(rdx, JavaThread::popframe_processing_bit);
1533 __ movl(Address(thread, JavaThread::popframe_condition_offset()), rdx);
1534
1535 {
1536 // Check to see whether we are returning to a deoptimized frame.
1537 // (The PopFrame call ensures that the caller of the popped frame is
1538 // either interpreted or compiled and deoptimizes it if compiled.)
1539 // In this case, we can't call dispatch_next() after the frame is
1540 // popped, but instead must save the incoming arguments and restore
1541 // them after deoptimization has occurred.
1542 //
1543 // Note that we don't compare the return PC against the
1544 // deoptimization blob's unpack entry because of the presence of
1545 // adapter frames in C2.
1546 Label caller_not_deoptimized;
1547 Register rarg = NOT_LP64(rdx) LP64_ONLY(c_rarg1);
1548 __ movptr(rarg, Address(rbp, frame::return_addr_offset * wordSize));
1549 __ super_call_VM_leaf(CAST_FROM_FN_PTR(address,
1550 InterpreterRuntime::interpreter_contains), rarg);
1551 __ testl(rax, rax);
1552 __ jcc(Assembler::notZero, caller_not_deoptimized);
1553
1554 // Compute size of arguments for saving when returning to
1555 // deoptimized caller
1556 __ get_method(rax);
1557 __ movptr(rax, Address(rax, Method::const_offset()));
1558 __ load_unsigned_short(rax, Address(rax, in_bytes(ConstMethod::
1559 size_of_parameters_offset())));
1560 __ shll(rax, Interpreter::logStackElementSize);
1561 __ restore_locals();
1562 __ subptr(rlocals, rax);
1563 __ addptr(rlocals, wordSize);
1564 // Save these arguments
1565 NOT_LP64(__ get_thread(thread));
1566 __ super_call_VM_leaf(CAST_FROM_FN_PTR(address,
1567 Deoptimization::
1568 popframe_preserve_args),
1569 thread, rax, rlocals);
1570
1571 __ remove_activation(vtos, rdx,
1572 /* throw_monitor_exception */ false,
1573 /* install_monitor_exception */ false,
1574 /* notify_jvmdi */ false);
1575
1576 // Inform deoptimization that it is responsible for restoring
1577 // these arguments
1578 NOT_LP64(__ get_thread(thread));
1579 __ movl(Address(thread, JavaThread::popframe_condition_offset()),
1580 JavaThread::popframe_force_deopt_reexecution_bit);
1581
1582 // Continue in deoptimization handler
1583 __ jmp(rdx);
1584
1585 __ bind(caller_not_deoptimized);
1586 }
1587
1588 __ remove_activation(vtos, rdx, /* rdx result (retaddr) is not used */
1589 /* throw_monitor_exception */ false,
1590 /* install_monitor_exception */ false,
1591 /* notify_jvmdi */ false);
1592
1593 // Finish with popframe handling
1594 // A previous I2C followed by a deoptimization might have moved the
1595 // outgoing arguments further up the stack. PopFrame expects the
1596 // mutations to those outgoing arguments to be preserved and other
1597 // constraints basically require this frame to look exactly as
1598 // though it had previously invoked an interpreted activation with
1599 // no space between the top of the expression stack (current
1600 // last_sp) and the top of stack. Rather than force deopt to
1601 // maintain this kind of invariant all the time we call a small
1602 // fixup routine to move the mutated arguments onto the top of our
1603 // expression stack if necessary.
1604 #ifndef _LP64
1605 __ mov(rax, rsp);
1606 __ movptr(rbx, Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize));
1607 __ get_thread(thread);
1608 // PC must point into interpreter here
1609 __ set_last_Java_frame(thread, noreg, rbp, __ pc());
1610 __ super_call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::popframe_move_outgoing_args), thread, rax, rbx);
1611 __ get_thread(thread);
1612 #else
1613 __ mov(c_rarg1, rsp);
1614 __ movptr(c_rarg2, Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize));
1615 // PC must point into interpreter here
1616 __ set_last_Java_frame(noreg, rbp, __ pc());
1617 __ super_call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::popframe_move_outgoing_args), r15_thread, c_rarg1, c_rarg2);
1618 #endif
1619 __ reset_last_Java_frame(thread, true);
1620
1621 // Restore the last_sp and null it out
1622 __ movptr(rsp, Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize));
1623 __ movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), (int32_t)NULL_WORD);
1624
1625 __ restore_bcp();
1626 __ restore_locals();
1627 // The method data pointer was incremented already during
1628 // call profiling. We have to restore the mdp for the current bcp.
1629 if (ProfileInterpreter) {
1630 __ set_method_data_pointer_for_bcp();
1631 }
1632
1633 // Clear the popframe condition flag
1634 NOT_LP64(__ get_thread(thread));
1635 __ movl(Address(thread, JavaThread::popframe_condition_offset()),
1636 JavaThread::popframe_inactive);
1637
1638 #if INCLUDE_JVMTI
1639 {
1640 Label L_done;
1641 const Register local0 = rlocals;
1642
1643 __ cmpb(Address(rbcp, 0), Bytecodes::_invokestatic);
1644 __ jcc(Assembler::notEqual, L_done);
1645
1646 // The member name argument must be restored if _invokestatic is re-executed after a PopFrame call.
1647 // Detect such a case in the InterpreterRuntime function and return the member name argument, or NULL.
1648
1649 __ get_method(rdx);
1650 __ movptr(rax, Address(local0, 0));
1651 __ call_VM(rax, CAST_FROM_FN_PTR(address, InterpreterRuntime::member_name_arg_or_null), rax, rdx, rbcp);
1652
1653 __ testptr(rax, rax);
1654 __ jcc(Assembler::zero, L_done);
1655
1656 __ movptr(Address(rbx, 0), rax);
1657 __ bind(L_done);
1658 }
1659 #endif // INCLUDE_JVMTI
1660
1661 __ dispatch_next(vtos);
1662 // end of PopFrame support
1663
1664 Interpreter::_remove_activation_entry = __ pc();
1665
1666 // preserve exception over this code sequence
1667 __ pop_ptr(rax);
1668 NOT_LP64(__ get_thread(thread));
1669 __ movptr(Address(thread, JavaThread::vm_result_offset()), rax);
1670 // remove the activation (without doing throws on illegalMonitorExceptions)
1671 __ remove_activation(vtos, rdx, false, true, false);
1672 // restore exception
1673 NOT_LP64(__ get_thread(thread));
1674 __ get_vm_result(rax, thread);
1675
1676 // In between activations - previous activation type unknown yet
1677 // compute continuation point - the continuation point expects the
1678 // following registers set up:
1679 //
1680 // rax: exception
1681 // rdx: return address/pc that threw exception
1682 // rsp: expression stack of caller
1683 // rbp: ebp of caller
1684 __ push(rax); // save exception
1685 __ push(rdx); // save return address
1686 __ super_call_VM_leaf(CAST_FROM_FN_PTR(address,
1687 SharedRuntime::exception_handler_for_return_address),
1688 thread, rdx);
1689 __ mov(rbx, rax); // save exception handler
1690 __ pop(rdx); // restore return address
1691 __ pop(rax); // restore exception
1692 // Note that an "issuing PC" is actually the next PC after the call
1693 __ jmp(rbx); // jump to exception
1694 // handler of caller
1695 }
1696
1697
1698 //
1699 // JVMTI ForceEarlyReturn support
1700 //
1701 address TemplateInterpreterGenerator::generate_earlyret_entry_for(TosState state) {
1702 address entry = __ pc();
1703
1704 __ restore_bcp();
1705 __ restore_locals();
1706 __ empty_expression_stack();
1707 __ load_earlyret_value(state); // 32 bits returns value in rdx, so don't reuse
1708
1709 const Register thread = NOT_LP64(rcx) LP64_ONLY(r15_thread);
1710 NOT_LP64(__ get_thread(thread));
1711 __ movptr(rcx, Address(thread, JavaThread::jvmti_thread_state_offset()));
1712 Address cond_addr(rcx, JvmtiThreadState::earlyret_state_offset());
1713
1714 // Clear the earlyret state
1715 __ movl(cond_addr, JvmtiThreadState::earlyret_inactive);
1716
1717 __ remove_activation(state, rsi,
1718 false, /* throw_monitor_exception */
1719 false, /* install_monitor_exception */
1720 true); /* notify_jvmdi */
1721 __ jmp(rsi);
1722
1723 return entry;
1724 } // end of ForceEarlyReturn support
1725
1726
1727 //-----------------------------------------------------------------------------
1728 // Helper for vtos entry point generation
1729
1730 void TemplateInterpreterGenerator::set_vtos_entry_points(Template* t,
1731 address& bep,
1732 address& cep,
1733 address& sep,
1734 address& aep,
1735 address& iep,
1736 address& lep,
1737 address& fep,
1738 address& dep,
1739 address& vep) {
1740 assert(t->is_valid() && t->tos_in() == vtos, "illegal template");
1741 Label L;
1742 #ifndef _LP64
1743 fep = __ pc(); // ftos entry point
1744 __ push(ftos);
1745 __ jmpb(L);
1746 dep = __ pc(); // dtos entry point
1747 __ push(dtos);
1748 __ jmpb(L);
1749 #else
1750 fep = __ pc(); // ftos entry point
1751 __ push_f(xmm0);
1752 __ jmpb(L);
1753 dep = __ pc(); // dtos entry point
1754 __ push_d(xmm0);
1755 __ jmpb(L);
1756 #endif // _LP64
1757 lep = __ pc(); // ltos entry point
1758 __ push_l();
1759 __ jmpb(L);
1760 aep = bep = cep = sep = iep = __ pc(); // [abcsi]tos entry point
1761 __ push_i_or_ptr();
1762 vep = __ pc(); // vtos entry point
1763 __ bind(L);
1764 generate_and_dispatch(t);
1765 }
1766
1767 //-----------------------------------------------------------------------------
1768
1769 // Non-product code
1770 #ifndef PRODUCT
1771
1772 address TemplateInterpreterGenerator::generate_trace_code(TosState state) {
1773 address entry = __ pc();
1774
1775 #ifndef _LP64
1776 // prepare expression stack
1777 __ pop(rcx); // pop return address so expression stack is 'pure'
1778 __ push(state); // save tosca
1779
1780 // pass tosca registers as arguments & call tracer
1781 __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::trace_bytecode), rcx, rax, rdx);
1782 __ mov(rcx, rax); // make sure return address is not destroyed by pop(state)
1783 __ pop(state); // restore tosca
1784
1785 // return
1786 __ jmp(rcx);
1787 #else
1788 __ push(state);
1789 __ push(c_rarg0);
1790 __ push(c_rarg1);
1791 __ push(c_rarg2);
1792 __ push(c_rarg3);
1793 __ mov(c_rarg2, rax); // Pass itos
1794 #ifdef _WIN64
1795 __ movflt(xmm3, xmm0); // Pass ftos
1796 #endif
1797 __ call_VM(noreg,
1798 CAST_FROM_FN_PTR(address, InterpreterRuntime::trace_bytecode),
1799 c_rarg1, c_rarg2, c_rarg3);
1800 __ pop(c_rarg3);
1801 __ pop(c_rarg2);
1802 __ pop(c_rarg1);
1803 __ pop(c_rarg0);
1804 __ pop(state);
1805 __ ret(0); // return from result handler
1806 #endif // _LP64
1807
1808 return entry;
1809 }
1810
1811 void TemplateInterpreterGenerator::count_bytecode() {
1812 __ incrementl(ExternalAddress((address) &BytecodeCounter::_counter_value));
1813 }
1814
1815 void TemplateInterpreterGenerator::histogram_bytecode(Template* t) {
1816 __ incrementl(ExternalAddress((address) &BytecodeHistogram::_counters[t->bytecode()]));
1817 }
1818
1819 void TemplateInterpreterGenerator::histogram_bytecode_pair(Template* t) {
1820 __ mov32(rbx, ExternalAddress((address) &BytecodePairHistogram::_index));
1821 __ shrl(rbx, BytecodePairHistogram::log2_number_of_codes);
1822 __ orl(rbx,
1823 ((int) t->bytecode()) <<
1824 BytecodePairHistogram::log2_number_of_codes);
1825 __ mov32(ExternalAddress((address) &BytecodePairHistogram::_index), rbx);
1826 __ lea(rscratch1, ExternalAddress((address) BytecodePairHistogram::_counters));
1827 __ incrementl(Address(rscratch1, rbx, Address::times_4));
1828 }
1829
1830
1831 void TemplateInterpreterGenerator::trace_bytecode(Template* t) {
1832 // Call a little run-time stub to avoid blow-up for each bytecode.
1833 // The run-time runtime saves the right registers, depending on
1834 // the tosca in-state for the given template.
1835
1836 assert(Interpreter::trace_code(t->tos_in()) != NULL,
1837 "entry must have been generated");
1838 #ifndef _LP64
1839 __ call(RuntimeAddress(Interpreter::trace_code(t->tos_in())));
1840 #else
1841 __ mov(r12, rsp); // remember sp (can only use r12 if not using call_VM)
1842 __ andptr(rsp, -16); // align stack as required by ABI
1843 __ call(RuntimeAddress(Interpreter::trace_code(t->tos_in())));
1844 __ mov(rsp, r12); // restore sp
1845 __ reinit_heapbase();
1846 #endif // _LP64
1847 }
1848
1849
1850 void TemplateInterpreterGenerator::stop_interpreter_at() {
1851 Label L;
1852 __ cmp32(ExternalAddress((address) &BytecodeCounter::_counter_value),
1853 StopInterpreterAt);
1854 __ jcc(Assembler::notEqual, L);
1855 __ int3();
1856 __ bind(L);
1857 }
1858 #endif // !PRODUCT