1 /*
2 * Copyright (c) 2008, 2023, 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/assembler.hpp"
27 #include "asm/macroAssembler.inline.hpp"
28 #include "classfile/javaClasses.hpp"
29 #include "interpreter/bytecodeHistogram.hpp"
30 #include "interpreter/interp_masm.hpp"
31 #include "interpreter/interpreter.hpp"
32 #include "interpreter/interpreterRuntime.hpp"
33 #include "interpreter/templateInterpreterGenerator.hpp"
34 #include "interpreter/templateTable.hpp"
35 #include "oops/arrayOop.hpp"
36 #include "oops/methodData.hpp"
37 #include "oops/method.inline.hpp"
38 #include "oops/oop.inline.hpp"
39 #include "oops/resolvedIndyEntry.hpp"
40 #include "oops/resolvedMethodEntry.hpp"
41 #include "prims/jvmtiExport.hpp"
42 #include "prims/jvmtiThreadState.hpp"
43 #include "prims/methodHandles.hpp"
44 #include "runtime/arguments.hpp"
45 #include "runtime/deoptimization.hpp"
46 #include "runtime/frame.inline.hpp"
47 #include "runtime/jniHandles.hpp"
48 #include "runtime/sharedRuntime.hpp"
49 #include "runtime/stubRoutines.hpp"
50 #include "runtime/synchronizer.hpp"
51 #include "runtime/timer.hpp"
52 #include "runtime/vframeArray.hpp"
53 #include "utilities/align.hpp"
54 #include "utilities/debug.hpp"
55 #include "utilities/macros.hpp"
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 int TemplateInterpreter::InterpreterCodeSize = 180 * 1024;
63
64 #define __ _masm->
65
66 //------------------------------------------------------------------------------------------------------------------------
67
68 address TemplateInterpreterGenerator::generate_slow_signature_handler() {
69 address entry = __ pc();
70
71 // callee-save register for saving LR, shared with generate_native_entry
72 const Register Rsaved_ret_addr = Rtmp_save0;
73
74 __ mov(Rsaved_ret_addr, LR);
75
76 __ mov(R1, Rmethod);
77 __ mov(R2, Rlocals);
78 __ mov(R3, SP);
79
80
81 // Safer to save R9 (when scratched) since callers may have been
82 // written assuming R9 survives. This is suboptimal but
83 // probably not important for this slow case call site.
84 // Note for R9 saving: slow_signature_handler may copy register
85 // arguments above the current SP (passed as R3). It is safe for
86 // call_VM to use push and pop to protect additional values on the
87 // stack if needed.
88 __ call_VM(CAST_FROM_FN_PTR(address, InterpreterRuntime::slow_signature_handler), true /* save R9 if needed*/);
89 __ add(SP, SP, wordSize); // Skip R0
90 __ pop(RegisterSet(R1, R3)); // Load arguments passed in registers
91 #ifdef __ABI_HARD__
92 // Few alternatives to an always-load-FP-registers approach:
93 // - parse method signature to detect FP arguments
94 // - keep a counter/flag on a stack indicationg number of FP arguments in the method.
95 // The later has been originally implemented and tested but a conditional path could
96 // eliminate any gain imposed by avoiding 8 double word loads.
97 __ fldmiad(SP, FloatRegisterSet(D0, 8), writeback);
98 #endif // __ABI_HARD__
99
100 __ ret(Rsaved_ret_addr);
101
102 return entry;
103 }
104
105
106 //
107 // Various method entries (that c++ and asm interpreter agree upon)
108 //------------------------------------------------------------------------------------------------------------------------
109 //
110 //
111
112 // Abstract method entry
113 // Attempt to execute abstract method. Throw exception
114 address TemplateInterpreterGenerator::generate_abstract_entry(void) {
115 address entry_point = __ pc();
116
117
118 __ empty_expression_stack();
119
120 __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_AbstractMethodError));
121
122 DEBUG_ONLY(STOP("generate_abstract_entry");) // Should not reach here
123 return entry_point;
124 }
125
126 address TemplateInterpreterGenerator::generate_math_entry(AbstractInterpreter::MethodKind kind) {
127 address entry_point = nullptr;
128 Register continuation = LR;
129 bool use_runtime_call = false;
130 switch (kind) {
131 case Interpreter::java_lang_math_abs:
132 entry_point = __ pc();
133 #ifdef __SOFTFP__
134 use_runtime_call = true;
135 __ ldrd(R0, Address(SP));
136 #else // !__SOFTFP__
137 __ ldr_double(D0, Address(SP));
138 __ abs_double(D0, D0);
139 #endif // __SOFTFP__
140 break;
141 case Interpreter::java_lang_math_sqrt:
142 entry_point = __ pc();
143 #ifdef __SOFTFP__
144 use_runtime_call = true;
145 __ ldrd(R0, Address(SP));
146 #else // !__SOFTFP__
147 __ ldr_double(D0, Address(SP));
148 __ sqrt_double(D0, D0);
149 #endif // __SOFTFP__
150 break;
151 case Interpreter::java_lang_math_sin:
152 case Interpreter::java_lang_math_cos:
153 case Interpreter::java_lang_math_tan:
154 case Interpreter::java_lang_math_log:
155 case Interpreter::java_lang_math_log10:
156 case Interpreter::java_lang_math_exp:
157 entry_point = __ pc();
158 use_runtime_call = true;
159 #ifdef __SOFTFP__
160 __ ldrd(R0, Address(SP));
161 #else // !__SOFTFP__
162 __ ldr_double(D0, Address(SP));
163 #endif // __SOFTFP__
164 break;
165 case Interpreter::java_lang_math_pow:
166 entry_point = __ pc();
167 use_runtime_call = true;
168 #ifdef __SOFTFP__
169 __ ldrd(R0, Address(SP, 2 * Interpreter::stackElementSize));
170 __ ldrd(R2, Address(SP));
171 #else // !__SOFTFP__
172 __ ldr_double(D0, Address(SP, 2 * Interpreter::stackElementSize));
173 __ ldr_double(D1, Address(SP));
174 #endif // __SOFTFP__
175 break;
176 case Interpreter::java_lang_math_fmaD:
177 case Interpreter::java_lang_math_fmaF:
178 case Interpreter::java_lang_math_tanh:
179 // TODO: Implement intrinsic
180 break;
181 default:
182 ShouldNotReachHere();
183 }
184
185 if (entry_point != nullptr) {
186 __ mov(SP, Rsender_sp);
187 if (use_runtime_call) {
188 __ mov(Rtmp_save0, LR);
189 continuation = Rtmp_save0;
190 generate_math_runtime_call(kind);
191 }
192 __ ret(continuation);
193 }
194 return entry_point;
195 }
196
197 void TemplateInterpreterGenerator::generate_math_runtime_call(AbstractInterpreter::MethodKind kind) {
198 address fn;
199 switch (kind) {
200 #ifdef __SOFTFP__
201 case Interpreter::java_lang_math_abs:
202 fn = CAST_FROM_FN_PTR(address, SharedRuntime::dabs);
203 break;
204 case Interpreter::java_lang_math_sqrt:
205 fn = CAST_FROM_FN_PTR(address, SharedRuntime::dsqrt);
206 break;
207 #endif // __SOFTFP__
208 case Interpreter::java_lang_math_sin:
209 fn = CAST_FROM_FN_PTR(address, SharedRuntime::dsin);
210 break;
211 case Interpreter::java_lang_math_cos:
212 fn = CAST_FROM_FN_PTR(address, SharedRuntime::dcos);
213 break;
214 case Interpreter::java_lang_math_tan:
215 fn = CAST_FROM_FN_PTR(address, SharedRuntime::dtan);
216 break;
217 case Interpreter::java_lang_math_log:
218 fn = CAST_FROM_FN_PTR(address, SharedRuntime::dlog);
219 break;
220 case Interpreter::java_lang_math_log10:
221 fn = CAST_FROM_FN_PTR(address, SharedRuntime::dlog10);
222 break;
223 case Interpreter::java_lang_math_exp:
224 fn = CAST_FROM_FN_PTR(address, SharedRuntime::dexp);
225 break;
226 case Interpreter::java_lang_math_pow:
227 fn = CAST_FROM_FN_PTR(address, SharedRuntime::dpow);
228 break;
229 default:
230 ShouldNotReachHere();
231 fn = nullptr; // silence "maybe uninitialized" compiler warnings
232 }
233 __ call_VM_leaf(fn);
234 }
235
236 address TemplateInterpreterGenerator::generate_StackOverflowError_handler() {
237 address entry = __ pc();
238
239 // Note: There should be a minimal interpreter frame set up when stack
240 // overflow occurs since we check explicitly for it now.
241 //
242 #ifdef ASSERT
243 { Label L;
244 __ sub(Rtemp, FP, - frame::interpreter_frame_monitor_block_top_offset * wordSize);
245 __ cmp(SP, Rtemp); // Rtemp = maximal SP for current FP,
246 // (stack grows negative)
247 __ b(L, ls); // check if frame is complete
248 __ stop ("interpreter frame not set up");
249 __ bind(L);
250 }
251 #endif // ASSERT
252
253 // Restore bcp under the assumption that the current frame is still
254 // interpreted
255 __ restore_bcp();
256
257 // expression stack must be empty before entering the VM if an exception
258 // happened
259 __ empty_expression_stack();
260
261 // throw exception
262 __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_StackOverflowError));
263
264 __ should_not_reach_here();
265
266 return entry;
267 }
268
269 address TemplateInterpreterGenerator::generate_ArrayIndexOutOfBounds_handler() {
270 address entry = __ pc();
271
272 // index is in R4_ArrayIndexOutOfBounds_index
273
274 // expression stack must be empty before entering the VM if an exception happened
275 __ empty_expression_stack();
276
277 // setup parameters
278 // Array expected in R1.
279 __ mov(R2, R4_ArrayIndexOutOfBounds_index);
280
281 __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_ArrayIndexOutOfBoundsException), R1, R2);
282
283 __ nop(); // to avoid filling CPU pipeline with invalid instructions
284 __ nop();
285 __ should_not_reach_here();
286
287 return entry;
288 }
289
290 address TemplateInterpreterGenerator::generate_ClassCastException_handler() {
291 address entry = __ pc();
292
293 // object is in R2_ClassCastException_obj
294
295 // expression stack must be empty before entering the VM if an exception
296 // happened
297 __ empty_expression_stack();
298
299 __ mov(R1, R2_ClassCastException_obj);
300 __ call_VM(noreg,
301 CAST_FROM_FN_PTR(address,
302 InterpreterRuntime::throw_ClassCastException),
303 R1);
304
305 __ should_not_reach_here();
306
307 return entry;
308 }
309
310 address TemplateInterpreterGenerator::generate_exception_handler_common(const char* name, const char* message, bool pass_oop) {
311 assert(!pass_oop || message == nullptr, "either oop or message but not both");
312 address entry = __ pc();
313
314 InlinedString Lname(name);
315 InlinedString Lmessage(message);
316
317 if (pass_oop) {
318 // object is at TOS
319 __ pop_ptr(R2);
320 }
321
322 // expression stack must be empty before entering the VM if an exception happened
323 __ empty_expression_stack();
324
325 // setup parameters
326 __ ldr_literal(R1, Lname);
327
328 if (pass_oop) {
329 __ call_VM(Rexception_obj, CAST_FROM_FN_PTR(address, InterpreterRuntime::create_klass_exception), R1, R2);
330 } else {
331 if (message != nullptr) {
332 __ ldr_literal(R2, Lmessage);
333 } else {
334 __ mov(R2, 0);
335 }
336 __ call_VM(Rexception_obj, CAST_FROM_FN_PTR(address, InterpreterRuntime::create_exception), R1, R2);
337 }
338
339 // throw exception
340 __ b(Interpreter::throw_exception_entry());
341
342 __ nop(); // to avoid filling CPU pipeline with invalid instructions
343 __ nop();
344 __ bind_literal(Lname);
345 if (!pass_oop && (message != nullptr)) {
346 __ bind_literal(Lmessage);
347 }
348
349 return entry;
350 }
351
352 address TemplateInterpreterGenerator::generate_return_entry_for(TosState state, int step, size_t index_size) {
353 address entry = __ pc();
354
355 __ interp_verify_oop(R0_tos, state, __FILE__, __LINE__);
356
357 // Restore stack bottom in case i2c adjusted stack
358 __ ldr(SP, Address(FP, frame::interpreter_frame_last_sp_offset * wordSize));
359 // and null it as marker that SP is now tos until next java call
360 __ mov(Rtemp, (int)NULL_WORD);
361 __ str(Rtemp, Address(FP, frame::interpreter_frame_last_sp_offset * wordSize));
362
363 __ restore_method();
364 __ restore_bcp();
365 __ restore_dispatch();
366 __ restore_locals();
367
368 const Register Rcache = R2_tmp;
369 const Register Rindex = R3_tmp;
370
371 if (index_size == sizeof(u4)) {
372 __ load_resolved_indy_entry(Rcache, Rindex);
373 __ ldrh(Rcache, Address(Rcache, in_bytes(ResolvedIndyEntry::num_parameters_offset())));
374 } else {
375 // Pop N words from the stack
376 assert(index_size == sizeof(u2), "Can only be u2");
377 __ load_method_entry(Rcache, Rindex);
378 __ ldrh(Rcache, Address(Rcache, in_bytes(ResolvedMethodEntry::num_parameters_offset())));
379 }
380
381 __ check_stack_top();
382 __ add(Rstack_top, Rstack_top, AsmOperand(Rcache, lsl, Interpreter::logStackElementSize));
383
384 __ convert_retval_to_tos(state);
385
386 __ check_and_handle_popframe();
387 __ check_and_handle_earlyret();
388
389 __ dispatch_next(state, step);
390
391 return entry;
392 }
393
394 address TemplateInterpreterGenerator::generate_deopt_entry_for(TosState state, int step, address continuation) {
395 address entry = __ pc();
396
397 __ interp_verify_oop(R0_tos, state, __FILE__, __LINE__);
398
399 // The stack is not extended by deopt but we must null last_sp as this
400 // entry is like a "return".
401 __ mov(Rtemp, 0);
402 __ str(Rtemp, Address(FP, frame::interpreter_frame_last_sp_offset * wordSize));
403
404 __ restore_method();
405 __ restore_bcp();
406 __ restore_dispatch();
407 __ restore_locals();
408
409 // handle exceptions
410 { Label L;
411 __ ldr(Rtemp, Address(Rthread, Thread::pending_exception_offset()));
412 __ cbz(Rtemp, L);
413 __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_pending_exception));
414 __ should_not_reach_here();
415 __ bind(L);
416 }
417
418 if (continuation == nullptr) {
419 __ dispatch_next(state, step);
420 } else {
421 __ jump_to_entry(continuation);
422 }
423
424 return entry;
425 }
426
427 address TemplateInterpreterGenerator::generate_result_handler_for(BasicType type) {
428 address entry = __ pc();
429
430 switch (type) {
431 case T_CHAR : /* Nothing to do */ break;
432 case T_BYTE : /* Nothing to do */ break;
433 case T_SHORT : /* Nothing to do */ break;
434 case T_INT : /* Nothing to do */ break;
435 case T_LONG : /* Nothing to do */ break;
436 case T_VOID : /* Nothing to do */ break;
437 case T_DOUBLE : /* Nothing to do */ break;
438 case T_FLOAT : /* Nothing to do */ break;
439 case T_BOOLEAN : __ c2bool(R0); break;
440 case T_OBJECT :
441 __ ldr(R0, Address(FP, frame::interpreter_frame_oop_temp_offset * wordSize));
442 __ verify_oop(R0);
443 break;
444 default : __ should_not_reach_here(); break;
445 }
446
447 __ ret();
448 return entry;
449 }
450
451 address TemplateInterpreterGenerator::generate_safept_entry_for(TosState state, address runtime_entry) {
452 address entry = __ pc();
453 __ push(state);
454 __ call_VM(noreg, runtime_entry);
455
456 // load current bytecode
457 __ ldrb(R3_bytecode, Address(Rbcp));
458 __ dispatch_only_normal(vtos);
459 return entry;
460 }
461
462
463 // Helpers for commoning out cases in the various type of method entries.
464 //
465
466 // increment invocation count & check for overflow
467 //
468 // Note: checking for negative value instead of overflow
469 // so we have a 'sticky' overflow test
470 //
471 // In: Rmethod.
472 //
473 // Uses R0, R1, Rtemp.
474 //
475 void TemplateInterpreterGenerator::generate_counter_incr(Label* overflow) {
476 Label done;
477 const Register Rcounters = Rtemp;
478 const Address invocation_counter(Rcounters,
479 MethodCounters::invocation_counter_offset() +
480 InvocationCounter::counter_offset());
481
482 // Note: In tiered we increment either counters in MethodCounters* or
483 // in MDO depending if we're profiling or not.
484 int increment = InvocationCounter::count_increment;
485 Label no_mdo;
486 if (ProfileInterpreter) {
487 // Are we profiling?
488 __ ldr(R1_tmp, Address(Rmethod, Method::method_data_offset()));
489 __ cbz(R1_tmp, no_mdo);
490 // Increment counter in the MDO
491 const Address mdo_invocation_counter(R1_tmp,
492 in_bytes(MethodData::invocation_counter_offset()) +
493 in_bytes(InvocationCounter::counter_offset()));
494 const Address mask(R1_tmp, in_bytes(MethodData::invoke_mask_offset()));
495 __ increment_mask_and_jump(mdo_invocation_counter, increment, mask, R0_tmp, Rtemp, eq, overflow);
496 __ b(done);
497 }
498 __ bind(no_mdo);
499 __ get_method_counters(Rmethod, Rcounters, done);
500 const Address mask(Rcounters, in_bytes(MethodCounters::invoke_mask_offset()));
501 __ increment_mask_and_jump(invocation_counter, increment, mask, R0_tmp, R1_tmp, eq, overflow);
502 __ bind(done);
503 }
504
505 void TemplateInterpreterGenerator::generate_counter_overflow(Label& do_continue) {
506 // InterpreterRuntime::frequency_counter_overflow takes one argument
507 // indicating if the counter overflow occurs at a backwards branch (non-null bcp).
508 // The call returns the address of the verified entry point for the method or null
509 // if the compilation did not complete (either went background or bailed out).
510 __ mov(R1, (int)false);
511 __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::frequency_counter_overflow), R1);
512
513 // jump to the interpreted entry.
514 __ b(do_continue);
515 }
516
517 void TemplateInterpreterGenerator::generate_stack_overflow_check(void) {
518 // Check if we've got enough room on the stack for
519 // - overhead;
520 // - locals;
521 // - expression stack.
522 //
523 // Registers on entry:
524 //
525 // R3 = number of additional locals
526 // Rthread
527 // Rmethod
528 // Registers used: R0, R1, R2, Rtemp.
529
530 const Register Radditional_locals = R3;
531 const Register RmaxStack = R2;
532
533 // monitor entry size
534 const int entry_size = frame::interpreter_frame_monitor_size_in_bytes();
535
536 // total overhead size: entry_size + (saved registers, thru expr stack bottom).
537 // be sure to change this if you add/subtract anything to/from the overhead area
538 const int overhead_size = (frame::sender_sp_offset - frame::interpreter_frame_initial_sp_offset)*wordSize + entry_size;
539
540 // Pages reserved for VM runtime calls and subsequent Java calls.
541 const int reserved_pages = StackOverflow::stack_shadow_zone_size();
542
543 // Thread::stack_size() includes guard pages, and they should not be touched.
544 const int guard_pages = StackOverflow::stack_guard_zone_size();
545
546 __ ldr(R0, Address(Rthread, Thread::stack_base_offset()));
547 __ ldr(R1, Address(Rthread, Thread::stack_size_offset()));
548 __ ldr(Rtemp, Address(Rmethod, Method::const_offset()));
549 __ ldrh(RmaxStack, Address(Rtemp, ConstMethod::max_stack_offset()));
550 __ sub_slow(Rtemp, SP, overhead_size + reserved_pages + guard_pages + Method::extra_stack_words());
551
552 // reserve space for additional locals
553 __ sub(Rtemp, Rtemp, AsmOperand(Radditional_locals, lsl, Interpreter::logStackElementSize));
554
555 // stack size
556 __ sub(R0, R0, R1);
557
558 // reserve space for expression stack
559 __ sub(Rtemp, Rtemp, AsmOperand(RmaxStack, lsl, Interpreter::logStackElementSize));
560
561 __ cmp(Rtemp, R0);
562
563 __ mov(SP, Rsender_sp, ls); // restore SP
564 __ b(SharedRuntime::throw_StackOverflowError_entry(), ls);
565 }
566
567
568 // Allocate monitor and lock method (asm interpreter)
569 //
570 void TemplateInterpreterGenerator::lock_method() {
571 // synchronize method
572
573 const int entry_size = frame::interpreter_frame_monitor_size_in_bytes();
574 assert ((entry_size % StackAlignmentInBytes) == 0, "should keep stack alignment");
575
576 #ifdef ASSERT
577 { Label L;
578 __ ldr_u32(Rtemp, Address(Rmethod, Method::access_flags_offset()));
579 __ tbnz(Rtemp, JVM_ACC_SYNCHRONIZED_BIT, L);
580 __ stop("method doesn't need synchronization");
581 __ bind(L);
582 }
583 #endif // ASSERT
584
585 // get synchronization object
586 { Label done;
587 __ ldr_u32(Rtemp, Address(Rmethod, Method::access_flags_offset()));
588 __ tst(Rtemp, JVM_ACC_STATIC);
589 __ ldr(R0, Address(Rlocals, Interpreter::local_offset_in_bytes(0)), eq); // get receiver (assume this is frequent case)
590 __ b(done, eq);
591 __ load_mirror(R0, Rmethod, Rtemp);
592 __ bind(done);
593 }
594
595 // add space for monitor & lock
596
597
598 __ sub(Rstack_top, Rstack_top, entry_size);
599 __ check_stack_top_on_expansion();
600 // add space for a monitor entry
601 __ str(Rstack_top, Address(FP, frame::interpreter_frame_monitor_block_top_offset * wordSize));
602 // set new monitor block top
603 __ str(R0, Address(Rstack_top, BasicObjectLock::obj_offset()));
604 // store object
605 __ mov(R1, Rstack_top); // monitor entry address
606 __ lock_object(R1);
607 }
608
609
610 //
611 // Generate a fixed interpreter frame. This is identical setup for interpreted methods
612 // and for native methods hence the shared code.
613
614 void TemplateInterpreterGenerator::generate_fixed_frame(bool native_call) {
615 // Generates the following stack layout:
616 //
617 // [ expr. stack bottom ]
618 // [ saved Rbcp ]
619 // [ current Rlocals ]
620 // [ cache ]
621 // [ mdx ]
622 // [ Method* ]
623 // [ last_sp ]
624 // [ sender_sp ]
625 // [ saved FP ] <--- FP
626 // [ saved LR ]
627
628 // initialize fixed part of activation frame
629 __ push(LR); // save return address
630 __ push(FP); // save FP
631 __ mov(FP, SP); // establish new FP
632
633 __ push(Rsender_sp);
634
635 __ mov(R0, 0);
636 __ push(R0); // leave last_sp as null
637
638 // setup Rbcp
639 if (native_call) {
640 __ mov(Rbcp, 0); // bcp = 0 for native calls
641 } else {
642 __ ldr(Rtemp, Address(Rmethod, Method::const_offset())); // get ConstMethod*
643 __ add(Rbcp, Rtemp, ConstMethod::codes_offset()); // get codebase
644 }
645
646 __ push(Rmethod); // save Method*
647 // Get mirror and store it in the frame as GC root for this Method*
648 __ load_mirror(Rtemp, Rmethod, Rtemp);
649 __ push(Rtemp);
650
651 if (ProfileInterpreter) {
652 __ ldr(Rtemp, Address(Rmethod, Method::method_data_offset()));
653 __ tst(Rtemp, Rtemp);
654 __ add(Rtemp, Rtemp, in_bytes(MethodData::data_offset()), ne);
655 __ push(Rtemp); // set the mdp (method data pointer)
656 } else {
657 __ push(R0);
658 }
659
660 __ ldr(Rtemp, Address(Rmethod, Method::const_offset()));
661 __ ldr(Rtemp, Address(Rtemp, ConstMethod::constants_offset()));
662 __ ldr(Rtemp, Address(Rtemp, ConstantPool::cache_offset()));
663 __ push(Rtemp); // set constant pool cache
664 __ sub(Rtemp, Rlocals, FP);
665 __ logical_shift_right(Rtemp, Rtemp, Interpreter::logStackElementSize); // Rtemp = Rlocals - fp();
666 __ push(Rtemp); // set relativized Rlocals, see frame::interpreter_frame_locals()
667 __ push(Rbcp); // set bcp
668 __ push(R0); // reserve word for pointer to expression stack bottom
669 __ str(SP, Address(SP, 0)); // set expression stack bottom
670 }
671
672
673 // End of helpers
674
675 //------------------------------------------------------------------------------------------------------------------------
676 // Entry points
677 //
678 // Here we generate the various kind of entries into the interpreter.
679 // The two main entry type are generic bytecode methods and native call method.
680 // These both come in synchronized and non-synchronized versions but the
681 // frame layout they create is very similar. The other method entry
682 // types are really just special purpose entries that are really entry
683 // and interpretation all in one. These are for trivial methods like
684 // accessor, empty, or special math methods.
685 //
686 // When control flow reaches any of the entry types for the interpreter
687 // the following holds ->
688 //
689 // Arguments:
690 //
691 // Rmethod: Method*
692 // Rthread: thread
693 // Rsender_sp: sender sp
694 // Rparams (SP on 32-bit ARM): pointer to method parameters
695 //
696 // LR: return address
697 //
698 // Stack layout immediately at entry
699 //
700 // [ parameter n ] <--- Rparams (SP on 32-bit ARM)
701 // ...
702 // [ parameter 1 ]
703 // [ expression stack ] (caller's java expression stack)
704
705 // Assuming that we don't go to one of the trivial specialized
706 // entries the stack will look like below when we are ready to execute
707 // the first bytecode (or call the native routine). The register usage
708 // will be as the template based interpreter expects.
709 //
710 // local variables follow incoming parameters immediately; i.e.
711 // the return address is saved at the end of the locals.
712 //
713 // [ expr. stack ] <--- Rstack_top (SP on 32-bit ARM)
714 // [ monitor entry ]
715 // ...
716 // [ monitor entry ]
717 // [ expr. stack bottom ]
718 // [ saved Rbcp ]
719 // [ current Rlocals ]
720 // [ cache ]
721 // [ mdx ]
722 // [ mirror ]
723 // [ Method* ]
724 //
725 // 32-bit ARM:
726 // [ last_sp ]
727 //
728 // [ sender_sp ]
729 // [ saved FP ] <--- FP
730 // [ saved LR ]
731 // [ optional padding(*)]
732 // [ local variable m ]
733 // ...
734 // [ local variable 1 ]
735 // [ parameter n ]
736 // ...
737 // [ parameter 1 ] <--- Rlocals
738 //
739
740 address TemplateInterpreterGenerator::generate_Reference_get_entry(void) {
741 // Code: _aload_0, _getfield, _areturn
742 // parameter size = 1
743 //
744 // The code that gets generated by this routine is split into 2 parts:
745 // 1. The "intrinsified" code performing an ON_WEAK_OOP_REF load,
746 // 2. The slow path - which is an expansion of the regular method entry.
747 //
748 // Notes:-
749 // * An intrinsic is always executed, where an ON_WEAK_OOP_REF load is performed.
750 // * We may jump to the slow path iff the receiver is null. If the
751 // Reference object is null then we no longer perform an ON_WEAK_OOP_REF load
752 // Thus we can use the regular method entry code to generate the NPE.
753 //
754 // Rmethod: Method*
755 // Rthread: thread
756 // Rsender_sp: sender sp, must be preserved for slow path, set SP to it on fast path
757 // Rparams: parameters
758
759 address entry = __ pc();
760 Label slow_path;
761 const Register Rthis = R0;
762 const Register Rret_addr = Rtmp_save1;
763 assert_different_registers(Rthis, Rret_addr, Rsender_sp);
764
765 const int referent_offset = java_lang_ref_Reference::referent_offset();
766
767 // Check if local 0 != nullptr
768 // If the receiver is null then it is OK to jump to the slow path.
769 __ ldr(Rthis, Address(Rparams));
770 __ cbz(Rthis, slow_path);
771
772 // Preserve LR
773 __ mov(Rret_addr, LR);
774
775 // Load the value of the referent field.
776 const Address field_address(Rthis, referent_offset);
777 __ load_heap_oop(R0, field_address, Rtemp, R1_tmp, R2_tmp, ON_WEAK_OOP_REF);
778
779 // _areturn
780 __ mov(SP, Rsender_sp);
781 __ ret(Rret_addr);
782
783 // generate a vanilla interpreter entry as the slow path
784 __ bind(slow_path);
785 __ jump_to_entry(Interpreter::entry_for_kind(Interpreter::zerolocals));
786 return entry;
787 }
788
789 // Not supported
790 address TemplateInterpreterGenerator::generate_currentThread() { return nullptr; }
791 address TemplateInterpreterGenerator::generate_CRC32_update_entry() { return nullptr; }
792 address TemplateInterpreterGenerator::generate_CRC32_updateBytes_entry(AbstractInterpreter::MethodKind kind) { return nullptr; }
793 address TemplateInterpreterGenerator::generate_CRC32C_updateBytes_entry(AbstractInterpreter::MethodKind kind) { return nullptr; }
794 address TemplateInterpreterGenerator::generate_Float_intBitsToFloat_entry() { return nullptr; }
795 address TemplateInterpreterGenerator::generate_Float_floatToRawIntBits_entry() { return nullptr; }
796 address TemplateInterpreterGenerator::generate_Double_longBitsToDouble_entry() { return nullptr; }
797 address TemplateInterpreterGenerator::generate_Double_doubleToRawLongBits_entry() { return nullptr; }
798 address TemplateInterpreterGenerator::generate_Float_float16ToFloat_entry() { return nullptr; }
799 address TemplateInterpreterGenerator::generate_Float_floatToFloat16_entry() { return nullptr; }
800
801 //
802 // Interpreter stub for calling a native method. (asm interpreter)
803 // This sets up a somewhat different looking stack for calling the native method
804 // than the typical interpreter frame setup.
805 //
806
807 address TemplateInterpreterGenerator::generate_native_entry(bool synchronized) {
808 // determine code generation flags
809 bool inc_counter = UseCompiler || CountCompiledCalls;
810
811 // Incoming registers:
812 //
813 // Rmethod: Method*
814 // Rthread: thread
815 // Rsender_sp: sender sp
816 // Rparams: parameters
817
818 address entry_point = __ pc();
819
820 // Register allocation
821 const Register Rsize_of_params = R6;
822 const Register Rsig_handler = Rtmp_save0; // R4
823 const Register Rnative_code = Rtmp_save1; // R5
824 const Register Rresult_handler = R6;
825
826 const Register Rsaved_result_lo = Rtmp_save0; // R4
827 const Register Rsaved_result_hi = Rtmp_save1; // R5
828 FloatRegister saved_result_fp;
829
830
831 __ ldr(Rsize_of_params, Address(Rmethod, Method::const_offset()));
832 __ ldrh(Rsize_of_params, Address(Rsize_of_params, ConstMethod::size_of_parameters_offset()));
833
834 // native calls don't need the stack size check since they have no expression stack
835 // and the arguments are already on the stack and we only add a handful of words
836 // to the stack
837
838 // compute beginning of parameters (Rlocals)
839 __ sub(Rlocals, Rparams, wordSize);
840 __ add(Rlocals, Rlocals, AsmOperand(Rsize_of_params, lsl, Interpreter::logStackElementSize));
841
842 // reserve stack space for oop_temp
843 __ mov(R0, 0);
844 __ push(R0);
845
846 generate_fixed_frame(true); // Note: R9 is now saved in the frame
847
848 // make sure method is native & not abstract
849 #ifdef ASSERT
850 __ ldr_u32(Rtemp, Address(Rmethod, Method::access_flags_offset()));
851 {
852 Label L;
853 __ tbnz(Rtemp, JVM_ACC_NATIVE_BIT, L);
854 __ stop("tried to execute non-native method as native");
855 __ bind(L);
856 }
857 { Label L;
858 __ tbz(Rtemp, JVM_ACC_ABSTRACT_BIT, L);
859 __ stop("tried to execute abstract method in interpreter");
860 __ bind(L);
861 }
862 #endif
863
864 // increment invocation count & check for overflow
865 Label invocation_counter_overflow;
866 if (inc_counter) {
867 if (synchronized) {
868 // Avoid unlocking method's monitor in case of exception, as it has not
869 // been locked yet.
870 __ set_do_not_unlock_if_synchronized(true, Rtemp);
871 }
872 generate_counter_incr(&invocation_counter_overflow);
873 }
874
875 Label continue_after_compile;
876 __ bind(continue_after_compile);
877
878 if (inc_counter && synchronized) {
879 __ set_do_not_unlock_if_synchronized(false, Rtemp);
880 }
881
882 // check for synchronized methods
883 // Must happen AFTER invocation_counter check and stack overflow check,
884 // so method is not locked if overflows.
885 //
886 if (synchronized) {
887 lock_method();
888 } else {
889 // no synchronization necessary
890 #ifdef ASSERT
891 { Label L;
892 __ ldr_u32(Rtemp, Address(Rmethod, Method::access_flags_offset()));
893 __ tbz(Rtemp, JVM_ACC_SYNCHRONIZED_BIT, L);
894 __ stop("method needs synchronization");
895 __ bind(L);
896 }
897 #endif
898 }
899
900 // start execution
901 #ifdef ASSERT
902 { Label L;
903 __ ldr(Rtemp, Address(FP, frame::interpreter_frame_monitor_block_top_offset * wordSize));
904 __ cmp(Rtemp, Rstack_top);
905 __ b(L, eq);
906 __ stop("broken stack frame setup in interpreter 3");
907 __ bind(L);
908 }
909 #endif
910 __ check_extended_sp(Rtemp);
911
912 // jvmti/dtrace support
913 __ notify_method_entry();
914 #if R9_IS_SCRATCHED
915 __ restore_method();
916 #endif
917
918 {
919 Label L;
920 __ ldr(Rsig_handler, Address(Rmethod, Method::signature_handler_offset()));
921 __ cbnz(Rsig_handler, L);
922 __ mov(R1, Rmethod);
923 __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::prepare_native_call), R1, true);
924 __ ldr(Rsig_handler, Address(Rmethod, Method::signature_handler_offset()));
925 __ bind(L);
926 }
927
928 {
929 Label L;
930 __ ldr(Rnative_code, Address(Rmethod, Method::native_function_offset()));
931 __ cbnz(Rnative_code, L);
932 __ mov(R1, Rmethod);
933 __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::prepare_native_call), R1);
934 __ ldr(Rnative_code, Address(Rmethod, Method::native_function_offset()));
935 __ bind(L);
936 }
937
938 // Allocate stack space for arguments
939
940
941 // C functions need aligned stack
942 __ bic(SP, SP, StackAlignmentInBytes - 1);
943 // Multiply by BytesPerLong instead of BytesPerWord, because calling convention
944 // may require empty slots due to long alignment, e.g. func(int, jlong, int, jlong)
945 __ sub(SP, SP, AsmOperand(Rsize_of_params, lsl, LogBytesPerLong));
946
947 #ifdef __ABI_HARD__
948 // Allocate more stack space to accommodate all GP as well as FP registers:
949 // 4 * wordSize
950 // 8 * BytesPerLong
951 int reg_arguments = align_up((4*wordSize) + (8*BytesPerLong), StackAlignmentInBytes);
952 #else
953 // Reserve at least 4 words on the stack for loading
954 // of parameters passed on registers (R0-R3).
955 // See generate_slow_signature_handler().
956 // It is also used for JNIEnv & class additional parameters.
957 int reg_arguments = 4 * wordSize;
958 #endif // __ABI_HARD__
959
960 __ sub(SP, SP, reg_arguments);
961
962
963 // Note: signature handler blows R4 besides all scratch registers.
964 // See AbstractInterpreterGenerator::generate_slow_signature_handler().
965 __ call(Rsig_handler);
966 #if R9_IS_SCRATCHED
967 __ restore_method();
968 #endif
969 __ mov(Rresult_handler, R0);
970
971 // Pass JNIEnv and mirror for static methods
972 {
973 Label L;
974 __ ldr_u32(Rtemp, Address(Rmethod, Method::access_flags_offset()));
975 __ add(R0, Rthread, in_bytes(JavaThread::jni_environment_offset()));
976 __ tbz(Rtemp, JVM_ACC_STATIC_BIT, L);
977 __ load_mirror(Rtemp, Rmethod, Rtemp);
978 __ add(R1, FP, frame::interpreter_frame_oop_temp_offset * wordSize);
979 __ str(Rtemp, Address(R1, 0));
980 __ bind(L);
981 }
982
983 __ set_last_Java_frame(SP, FP, true, Rtemp);
984
985 // Changing state to _thread_in_native must be the last thing to do
986 // before the jump to native code. At this moment stack must be
987 // safepoint-safe and completely prepared for stack walking.
988 #ifdef ASSERT
989 {
990 Label L;
991 __ ldr_u32(Rtemp, Address(Rthread, JavaThread::thread_state_offset()));
992 __ cmp_32(Rtemp, _thread_in_Java);
993 __ b(L, eq);
994 __ stop("invalid thread state");
995 __ bind(L);
996 }
997 #endif
998
999 // Force all preceding writes to be observed prior to thread state change
1000 __ membar(MacroAssembler::StoreStore, Rtemp);
1001
1002 __ mov(Rtemp, _thread_in_native);
1003 __ str(Rtemp, Address(Rthread, JavaThread::thread_state_offset()));
1004
1005 __ call(Rnative_code);
1006 #if R9_IS_SCRATCHED
1007 __ restore_method();
1008 #endif
1009
1010 // Set FPSCR/FPCR to a known state
1011 if (AlwaysRestoreFPU) {
1012 __ restore_default_fp_mode();
1013 }
1014
1015 // Do safepoint check
1016 __ mov(Rtemp, _thread_in_native_trans);
1017 __ str_32(Rtemp, Address(Rthread, JavaThread::thread_state_offset()));
1018
1019 // Force this write out before the read below
1020 if (!UseSystemMemoryBarrier) {
1021 __ membar(MacroAssembler::StoreLoad, Rtemp);
1022 }
1023
1024 // Protect the return value in the interleaved code: save it to callee-save registers.
1025 __ mov(Rsaved_result_lo, R0);
1026 __ mov(Rsaved_result_hi, R1);
1027 #ifdef __ABI_HARD__
1028 // preserve native FP result in a callee-saved register
1029 saved_result_fp = D8;
1030 __ fcpyd(saved_result_fp, D0);
1031 #else
1032 saved_result_fp = fnoreg;
1033 #endif // __ABI_HARD__
1034
1035 {
1036 Label call, skip_call;
1037 __ safepoint_poll(Rtemp, call);
1038 __ ldr_u32(R3, Address(Rthread, JavaThread::suspend_flags_offset()));
1039 __ cmp(R3, 0);
1040 __ b(skip_call, eq);
1041 __ bind(call);
1042 __ mov(R0, Rthread);
1043 __ call(CAST_FROM_FN_PTR(address, JavaThread::check_special_condition_for_native_trans), relocInfo::none);
1044 __ bind(skip_call);
1045
1046 #if R9_IS_SCRATCHED
1047 __ restore_method();
1048 #endif
1049 }
1050
1051 // Perform Native->Java thread transition
1052 __ mov(Rtemp, _thread_in_Java);
1053 __ str_32(Rtemp, Address(Rthread, JavaThread::thread_state_offset()));
1054
1055 // Zero handles and last_java_sp
1056 __ reset_last_Java_frame(Rtemp);
1057 __ ldr(R3, Address(Rthread, JavaThread::active_handles_offset()));
1058 __ str_32(__ zero_register(Rtemp), Address(R3, JNIHandleBlock::top_offset()));
1059 if (CheckJNICalls) {
1060 __ str(__ zero_register(Rtemp), Address(Rthread, JavaThread::pending_jni_exception_check_fn_offset()));
1061 }
1062
1063 // Unbox oop result, e.g. JNIHandles::resolve result if it's an oop.
1064 {
1065 Label Lnot_oop;
1066 __ mov_slow(Rtemp, AbstractInterpreter::result_handler(T_OBJECT));
1067 __ cmp(Rtemp, Rresult_handler);
1068 __ b(Lnot_oop, ne);
1069 Register value = Rsaved_result_lo;
1070 __ resolve_jobject(value, // value
1071 Rtemp, // tmp1
1072 R1_tmp); // tmp2
1073 // Store resolved result in frame for GC visibility.
1074 __ str(value, Address(FP, frame::interpreter_frame_oop_temp_offset * wordSize));
1075 __ bind(Lnot_oop);
1076 }
1077
1078
1079 // reguard stack if StackOverflow exception happened while in native.
1080 {
1081 __ ldr_u32(Rtemp, Address(Rthread, JavaThread::stack_guard_state_offset()));
1082 __ cmp_32(Rtemp, StackOverflow::stack_guard_yellow_reserved_disabled);
1083 __ call(CAST_FROM_FN_PTR(address, SharedRuntime::reguard_yellow_pages), relocInfo::none, eq);
1084 #if R9_IS_SCRATCHED
1085 __ restore_method();
1086 #endif
1087 }
1088
1089 // check pending exceptions
1090 {
1091 __ ldr(Rtemp, Address(Rthread, Thread::pending_exception_offset()));
1092 __ cmp(Rtemp, 0);
1093 __ mov(Rexception_pc, PC, ne);
1094 __ b(StubRoutines::forward_exception_entry(), ne);
1095 }
1096
1097 if (synchronized) {
1098 // address of first monitor
1099 __ sub(R0, FP, - (frame::interpreter_frame_monitor_block_bottom_offset - frame::interpreter_frame_monitor_size()) * wordSize);
1100 __ unlock_object(R0);
1101 }
1102
1103 // jvmti/dtrace support
1104 // Note: This must happen _after_ handling/throwing any exceptions since
1105 // the exception handler code notifies the runtime of method exits
1106 // too. If this happens before, method entry/exit notifications are
1107 // not properly paired (was bug - gri 11/22/99).
1108 __ notify_method_exit(vtos, InterpreterMacroAssembler::NotifyJVMTI, true, Rsaved_result_lo, Rsaved_result_hi, saved_result_fp);
1109
1110 // Restore the result. Oop result is restored from the stack by the
1111 // result handler.
1112 __ mov(R0, Rsaved_result_lo);
1113 __ mov(R1, Rsaved_result_hi);
1114
1115 #ifdef __ABI_HARD__
1116 // reload native FP result
1117 __ fcpyd(D0, D8);
1118 #endif // __ABI_HARD__
1119
1120 __ blx(Rresult_handler);
1121
1122 // Restore FP/LR, sender_sp and return
1123 __ mov(Rtemp, FP);
1124 __ ldmia(FP, RegisterSet(FP) | RegisterSet(LR));
1125 __ ldr(SP, Address(Rtemp, frame::interpreter_frame_sender_sp_offset * wordSize));
1126
1127 __ ret();
1128
1129 if (inc_counter) {
1130 // Handle overflow of counter and compile method
1131 __ bind(invocation_counter_overflow);
1132 generate_counter_overflow(continue_after_compile);
1133 }
1134
1135 return entry_point;
1136 }
1137
1138 //
1139 // Generic interpreted method entry to (asm) interpreter
1140 //
1141 address TemplateInterpreterGenerator::generate_normal_entry(bool synchronized) {
1142 // determine code generation flags
1143 bool inc_counter = UseCompiler || CountCompiledCalls;
1144
1145 // Rmethod: Method*
1146 // Rthread: thread
1147 // Rsender_sp: sender sp (could differ from SP if we were called via c2i)
1148 // Rparams: pointer to the last parameter in the stack
1149
1150 address entry_point = __ pc();
1151
1152 const Register RconstMethod = R3;
1153
1154
1155 __ ldr(RconstMethod, Address(Rmethod, Method::const_offset()));
1156
1157 __ ldrh(R2, Address(RconstMethod, ConstMethod::size_of_parameters_offset()));
1158 __ ldrh(R3, Address(RconstMethod, ConstMethod::size_of_locals_offset()));
1159
1160 // setup Rlocals
1161 __ sub(Rlocals, Rparams, wordSize);
1162 __ add(Rlocals, Rlocals, AsmOperand(R2, lsl, Interpreter::logStackElementSize));
1163
1164 __ sub(R3, R3, R2); // number of additional locals
1165
1166
1167 // see if we've got enough room on the stack for locals plus overhead.
1168 generate_stack_overflow_check();
1169
1170 // allocate space for locals
1171 // explicitly initialize locals
1172
1173 // Loop is unrolled 4 times
1174 Label loop;
1175 __ mov(R0, 0);
1176 __ bind(loop);
1177
1178 // #1
1179 __ subs(R3, R3, 1);
1180 __ push(R0, ge);
1181
1182 // #2
1183 __ subs(R3, R3, 1, ge);
1184 __ push(R0, ge);
1185
1186 // #3
1187 __ subs(R3, R3, 1, ge);
1188 __ push(R0, ge);
1189
1190 // #4
1191 __ subs(R3, R3, 1, ge);
1192 __ push(R0, ge);
1193
1194 __ b(loop, gt);
1195
1196 // initialize fixed part of activation frame
1197 generate_fixed_frame(false);
1198
1199 __ restore_dispatch();
1200
1201 // make sure method is not native & not abstract
1202 #ifdef ASSERT
1203 __ ldr_u32(Rtemp, Address(Rmethod, Method::access_flags_offset()));
1204 {
1205 Label L;
1206 __ tbz(Rtemp, JVM_ACC_NATIVE_BIT, L);
1207 __ stop("tried to execute native method as non-native");
1208 __ bind(L);
1209 }
1210 { Label L;
1211 __ tbz(Rtemp, JVM_ACC_ABSTRACT_BIT, L);
1212 __ stop("tried to execute abstract method in interpreter");
1213 __ bind(L);
1214 }
1215 #endif
1216
1217 // increment invocation count & check for overflow
1218 Label invocation_counter_overflow;
1219 if (inc_counter) {
1220 if (synchronized) {
1221 // Avoid unlocking method's monitor in case of exception, as it has not
1222 // been locked yet.
1223 __ set_do_not_unlock_if_synchronized(true, Rtemp);
1224 }
1225 generate_counter_incr(&invocation_counter_overflow);
1226 }
1227 Label continue_after_compile;
1228 __ bind(continue_after_compile);
1229
1230 if (inc_counter && synchronized) {
1231 __ set_do_not_unlock_if_synchronized(false, Rtemp);
1232 }
1233 #if R9_IS_SCRATCHED
1234 __ restore_method();
1235 #endif
1236
1237 // check for synchronized methods
1238 // Must happen AFTER invocation_counter check and stack overflow check,
1239 // so method is not locked if overflows.
1240 //
1241 if (synchronized) {
1242 // Allocate monitor and lock method
1243 lock_method();
1244 } else {
1245 // no synchronization necessary
1246 #ifdef ASSERT
1247 { Label L;
1248 __ ldr_u32(Rtemp, Address(Rmethod, Method::access_flags_offset()));
1249 __ tbz(Rtemp, JVM_ACC_SYNCHRONIZED_BIT, L);
1250 __ stop("method needs synchronization");
1251 __ bind(L);
1252 }
1253 #endif
1254 }
1255
1256 // start execution
1257 #ifdef ASSERT
1258 { Label L;
1259 __ ldr(Rtemp, Address(FP, frame::interpreter_frame_monitor_block_top_offset * wordSize));
1260 __ cmp(Rtemp, Rstack_top);
1261 __ b(L, eq);
1262 __ stop("broken stack frame setup in interpreter 4");
1263 __ bind(L);
1264 }
1265 #endif
1266 __ check_extended_sp(Rtemp);
1267
1268 // jvmti support
1269 __ notify_method_entry();
1270 #if R9_IS_SCRATCHED
1271 __ restore_method();
1272 #endif
1273
1274 __ dispatch_next(vtos);
1275
1276 // invocation counter overflow
1277 if (inc_counter) {
1278 // Handle overflow of counter and compile method
1279 __ bind(invocation_counter_overflow);
1280 generate_counter_overflow(continue_after_compile);
1281 }
1282
1283 return entry_point;
1284 }
1285
1286 //------------------------------------------------------------------------------------------------------------------------
1287 // Exceptions
1288
1289 void TemplateInterpreterGenerator::generate_throw_exception() {
1290 // Entry point in previous activation (i.e., if the caller was interpreted)
1291 Interpreter::_rethrow_exception_entry = __ pc();
1292 // Rexception_obj: exception
1293
1294 // Clear interpreter_frame_last_sp.
1295 __ mov(Rtemp, 0);
1296 __ str(Rtemp, Address(FP, frame::interpreter_frame_last_sp_offset * wordSize));
1297
1298 #if R9_IS_SCRATCHED
1299 __ restore_method();
1300 #endif
1301 __ restore_bcp();
1302 __ restore_dispatch();
1303 __ restore_locals();
1304
1305
1306 // Entry point for exceptions thrown within interpreter code
1307 Interpreter::_throw_exception_entry = __ pc();
1308
1309 // expression stack is undefined here
1310 // Rexception_obj: exception
1311 // Rbcp: exception bcp
1312 __ verify_oop(Rexception_obj);
1313
1314 // expression stack must be empty before entering the VM in case of an exception
1315 __ empty_expression_stack();
1316 // find exception handler address and preserve exception oop
1317 __ mov(R1, Rexception_obj);
1318 __ call_VM(Rexception_obj, CAST_FROM_FN_PTR(address, InterpreterRuntime::exception_handler_for_exception), R1);
1319 // R0: exception handler entry point
1320 // Rexception_obj: preserved exception oop
1321 // Rbcp: bcp for exception handler
1322 __ push_ptr(Rexception_obj); // push exception which is now the only value on the stack
1323 __ jump(R0); // jump to exception handler (may be _remove_activation_entry!)
1324
1325 // If the exception is not handled in the current frame the frame is removed and
1326 // the exception is rethrown (i.e. exception continuation is _rethrow_exception).
1327 //
1328 // Note: At this point the bci is still the bxi for the instruction which caused
1329 // the exception and the expression stack is empty. Thus, for any VM calls
1330 // at this point, GC will find a legal oop map (with empty expression stack).
1331
1332 // In current activation
1333 // tos: exception
1334 // Rbcp: exception bcp
1335
1336 //
1337 // JVMTI PopFrame support
1338 //
1339 Interpreter::_remove_activation_preserving_args_entry = __ pc();
1340
1341
1342 __ empty_expression_stack();
1343
1344 // Set the popframe_processing bit in _popframe_condition indicating that we are
1345 // currently handling popframe, so that call_VMs that may happen later do not trigger new
1346 // popframe handling cycles.
1347
1348 __ ldr_s32(Rtemp, Address(Rthread, JavaThread::popframe_condition_offset()));
1349 __ orr(Rtemp, Rtemp, (unsigned)JavaThread::popframe_processing_bit);
1350 __ str_32(Rtemp, Address(Rthread, JavaThread::popframe_condition_offset()));
1351
1352 {
1353 // Check to see whether we are returning to a deoptimized frame.
1354 // (The PopFrame call ensures that the caller of the popped frame is
1355 // either interpreted or compiled and deoptimizes it if compiled.)
1356 // In this case, we can't call dispatch_next() after the frame is
1357 // popped, but instead must save the incoming arguments and restore
1358 // them after deoptimization has occurred.
1359 //
1360 // Note that we don't compare the return PC against the
1361 // deoptimization blob's unpack entry because of the presence of
1362 // adapter frames in C2.
1363 Label caller_not_deoptimized;
1364 __ ldr(R0, Address(FP, frame::return_addr_offset * wordSize));
1365 __ call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::interpreter_contains), R0);
1366 __ cbnz_32(R0, caller_not_deoptimized);
1367
1368 // Compute size of arguments for saving when returning to deoptimized caller
1369 __ restore_method();
1370 __ ldr(R0, Address(Rmethod, Method::const_offset()));
1371 __ ldrh(R0, Address(R0, ConstMethod::size_of_parameters_offset()));
1372
1373 __ logical_shift_left(R1, R0, Interpreter::logStackElementSize);
1374 // Save these arguments
1375 __ restore_locals();
1376 __ sub(R2, Rlocals, R1);
1377 __ add(R2, R2, wordSize);
1378 __ mov(R0, Rthread);
1379 __ call_VM_leaf(CAST_FROM_FN_PTR(address, Deoptimization::popframe_preserve_args), R0, R1, R2);
1380
1381 __ remove_activation(vtos, LR,
1382 /* throw_monitor_exception */ false,
1383 /* install_monitor_exception */ false,
1384 /* notify_jvmdi */ false);
1385
1386 // Inform deoptimization that it is responsible for restoring these arguments
1387 __ mov(Rtemp, JavaThread::popframe_force_deopt_reexecution_bit);
1388 __ str_32(Rtemp, Address(Rthread, JavaThread::popframe_condition_offset()));
1389
1390 // Continue in deoptimization handler
1391 __ ret();
1392
1393 __ bind(caller_not_deoptimized);
1394 }
1395
1396 __ remove_activation(vtos, R4,
1397 /* throw_monitor_exception */ false,
1398 /* install_monitor_exception */ false,
1399 /* notify_jvmdi */ false);
1400
1401 // Finish with popframe handling
1402 // A previous I2C followed by a deoptimization might have moved the
1403 // outgoing arguments further up the stack. PopFrame expects the
1404 // mutations to those outgoing arguments to be preserved and other
1405 // constraints basically require this frame to look exactly as
1406 // though it had previously invoked an interpreted activation with
1407 // no space between the top of the expression stack (current
1408 // last_sp) and the top of stack. Rather than force deopt to
1409 // maintain this kind of invariant all the time we call a small
1410 // fixup routine to move the mutated arguments onto the top of our
1411 // expression stack if necessary.
1412 __ mov(R1, SP);
1413 __ ldr(R2, Address(FP, frame::interpreter_frame_last_sp_offset * wordSize));
1414 // PC must point into interpreter here
1415 __ set_last_Java_frame(SP, FP, true, Rtemp);
1416 __ mov(R0, Rthread);
1417 __ call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::popframe_move_outgoing_args), R0, R1, R2);
1418 __ reset_last_Java_frame(Rtemp);
1419
1420 // Restore the last_sp and null it out
1421 __ ldr(SP, Address(FP, frame::interpreter_frame_last_sp_offset * wordSize));
1422 __ mov(Rtemp, (int)NULL_WORD);
1423 __ str(Rtemp, Address(FP, frame::interpreter_frame_last_sp_offset * wordSize));
1424
1425 __ restore_bcp();
1426 __ restore_dispatch();
1427 __ restore_locals();
1428 __ restore_method();
1429
1430 // The method data pointer was incremented already during
1431 // call profiling. We have to restore the mdp for the current bcp.
1432 if (ProfileInterpreter) {
1433 __ set_method_data_pointer_for_bcp();
1434 }
1435
1436 // Clear the popframe condition flag
1437 assert(JavaThread::popframe_inactive == 0, "adjust this code");
1438 __ str_32(__ zero_register(Rtemp), Address(Rthread, JavaThread::popframe_condition_offset()));
1439
1440 #if INCLUDE_JVMTI
1441 {
1442 Label L_done;
1443
1444 __ ldrb(Rtemp, Address(Rbcp, 0));
1445 __ cmp(Rtemp, Bytecodes::_invokestatic);
1446 __ b(L_done, ne);
1447
1448 // The member name argument must be restored if _invokestatic is re-executed after a PopFrame call.
1449 // Detect such a case in the InterpreterRuntime function and return the member name argument, or null.
1450
1451 // get local0
1452 __ ldr(R1, Address(Rlocals, 0));
1453 __ mov(R2, Rmethod);
1454 __ mov(R3, Rbcp);
1455 __ call_VM(R0, CAST_FROM_FN_PTR(address, InterpreterRuntime::member_name_arg_or_null), R1, R2, R3);
1456
1457 __ cbz(R0, L_done);
1458
1459 __ str(R0, Address(Rstack_top));
1460 __ bind(L_done);
1461 }
1462 #endif // INCLUDE_JVMTI
1463
1464 __ dispatch_next(vtos);
1465 // end of PopFrame support
1466
1467 Interpreter::_remove_activation_entry = __ pc();
1468
1469 // preserve exception over this code sequence
1470 __ pop_ptr(R0_tos);
1471 __ str(R0_tos, Address(Rthread, JavaThread::vm_result_offset()));
1472 // remove the activation (without doing throws on illegalMonitorExceptions)
1473 __ remove_activation(vtos, Rexception_pc, false, true, false);
1474 // restore exception
1475 __ get_vm_result(Rexception_obj, Rtemp);
1476
1477 // In between activations - previous activation type unknown yet
1478 // compute continuation point - the continuation point expects
1479 // the following registers set up:
1480 //
1481 // Rexception_obj: exception
1482 // Rexception_pc: return address/pc that threw exception
1483 // SP: expression stack of caller
1484 // FP: frame pointer of caller
1485 __ mov(c_rarg0, Rthread);
1486 __ mov(c_rarg1, Rexception_pc);
1487 __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::exception_handler_for_return_address), c_rarg0, c_rarg1);
1488 // Note that an "issuing PC" is actually the next PC after the call
1489
1490 __ jump(R0); // jump to exception handler of caller
1491 }
1492
1493
1494 //
1495 // JVMTI ForceEarlyReturn support
1496 //
1497 address TemplateInterpreterGenerator::generate_earlyret_entry_for(TosState state) {
1498 address entry = __ pc();
1499
1500
1501 __ restore_bcp();
1502 __ restore_dispatch();
1503 __ restore_locals();
1504
1505 __ empty_expression_stack();
1506
1507 __ load_earlyret_value(state);
1508
1509 // Clear the earlyret state
1510 __ ldr(Rtemp, Address(Rthread, JavaThread::jvmti_thread_state_offset()));
1511
1512 assert(JvmtiThreadState::earlyret_inactive == 0, "adjust this code");
1513 __ str_32(__ zero_register(R2), Address(Rtemp, JvmtiThreadState::earlyret_state_offset()));
1514
1515 __ remove_activation(state, LR,
1516 false, /* throw_monitor_exception */
1517 false, /* install_monitor_exception */
1518 true); /* notify_jvmdi */
1519
1520 // According to interpreter calling conventions, result is returned in R0/R1,
1521 // so ftos (S0) and dtos (D0) are moved to R0/R1.
1522 // This conversion should be done after remove_activation, as it uses
1523 // push(state) & pop(state) to preserve return value.
1524 __ convert_tos_to_retval(state);
1525 __ ret();
1526
1527 return entry;
1528 } // end of ForceEarlyReturn support
1529
1530
1531 //------------------------------------------------------------------------------------------------------------------------
1532 // Helper for vtos entry point generation
1533
1534 void TemplateInterpreterGenerator::set_vtos_entry_points (Template* t, address& bep, address& cep, address& sep, address& aep, address& iep, address& lep, address& fep, address& dep, address& vep) {
1535 assert(t->is_valid() && t->tos_in() == vtos, "illegal template");
1536 Label L;
1537
1538 #ifdef __SOFTFP__
1539 dep = __ pc(); // fall through
1540 #else
1541 fep = __ pc(); __ push(ftos); __ b(L);
1542 dep = __ pc(); __ push(dtos); __ b(L);
1543 #endif // __SOFTFP__
1544
1545 lep = __ pc(); __ push(ltos); __ b(L);
1546
1547 if (VerifyOops) { // can't share atos entry if VerifyOops
1548 aep = __ pc(); __ push(atos); __ b(L);
1549 } else {
1550 aep = __ pc(); // fall through
1551 }
1552
1553 #ifdef __SOFTFP__
1554 fep = __ pc(); // fall through
1555 #endif // __SOFTFP__
1556
1557 bep = cep = sep = // fall through
1558 iep = __ pc(); __ push(itos); // fall through
1559 vep = __ pc(); __ bind(L); // fall through
1560 generate_and_dispatch(t);
1561 }
1562
1563 //------------------------------------------------------------------------------------------------------------------------
1564
1565 void TemplateInterpreterGenerator::count_bytecode() {
1566 __ inc_global_counter((address) &BytecodeCounter::_counter_value, 0, Rtemp, R2_tmp, true);
1567 }
1568
1569
1570 void TemplateInterpreterGenerator::histogram_bytecode(Template* t) {
1571 __ inc_global_counter((address)&BytecodeHistogram::_counters[0], sizeof(BytecodeHistogram::_counters[0]) * t->bytecode(), Rtemp, R2_tmp, true);
1572 }
1573
1574 // Non-product code
1575 #ifndef PRODUCT
1576 address TemplateInterpreterGenerator::generate_trace_code(TosState state) {
1577 address entry = __ pc();
1578
1579 // prepare expression stack
1580 __ push(state); // save tosca
1581
1582 // pass tosca registers as arguments
1583 __ mov(R2, R0_tos);
1584 __ mov(R3, R1_tos_hi);
1585 __ mov(R1, LR); // save return address
1586
1587 // call tracer
1588 __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::trace_bytecode), R1, R2, R3);
1589
1590 __ mov(LR, R0); // restore return address
1591 __ pop(state); // restore tosca
1592
1593 // return
1594 __ ret();
1595
1596 return entry;
1597 }
1598
1599 void TemplateInterpreterGenerator::histogram_bytecode_pair(Template* t) {
1600 const Register Rindex_addr = R2_tmp;
1601 Label Lcontinue;
1602 InlinedAddress Lcounters((address)BytecodePairHistogram::_counters);
1603 InlinedAddress Lindex((address)&BytecodePairHistogram::_index);
1604 const Register Rcounters_addr = R2_tmp;
1605 const Register Rindex = R4_tmp;
1606
1607 // calculate new index for counter:
1608 // index = (_index >> log2_number_of_codes) | (bytecode << log2_number_of_codes).
1609 // (_index >> log2_number_of_codes) is previous bytecode
1610
1611 __ ldr_literal(Rindex_addr, Lindex);
1612 __ ldr_s32(Rindex, Address(Rindex_addr));
1613 __ mov_slow(Rtemp, ((int)t->bytecode()) << BytecodePairHistogram::log2_number_of_codes);
1614 __ orr(Rindex, Rtemp, AsmOperand(Rindex, lsr, BytecodePairHistogram::log2_number_of_codes));
1615 __ str_32(Rindex, Address(Rindex_addr));
1616
1617 // Rindex (R4) contains index of counter
1618
1619 __ ldr_literal(Rcounters_addr, Lcounters);
1620 __ ldr_s32(Rtemp, Address::indexed_32(Rcounters_addr, Rindex));
1621 __ adds_32(Rtemp, Rtemp, 1);
1622 __ b(Lcontinue, mi); // avoid overflow
1623 __ str_32(Rtemp, Address::indexed_32(Rcounters_addr, Rindex));
1624
1625 __ b(Lcontinue);
1626
1627 __ bind_literal(Lindex);
1628 __ bind_literal(Lcounters);
1629
1630 __ bind(Lcontinue);
1631 }
1632
1633
1634 void TemplateInterpreterGenerator::trace_bytecode(Template* t) {
1635 // Call a little run-time stub to avoid blow-up for each bytecode.
1636 // The run-time runtime saves the right registers, depending on
1637 // the tosca in-state for the given template.
1638 assert(Interpreter::trace_code(t->tos_in()) != nullptr,
1639 "entry must have been generated");
1640 address trace_entry = Interpreter::trace_code(t->tos_in());
1641 __ call(trace_entry, relocInfo::none);
1642 }
1643
1644
1645 void TemplateInterpreterGenerator::stop_interpreter_at() {
1646 Label Lcontinue;
1647 const Register stop_at = R2_tmp;
1648
1649 __ ldr_global_s32(Rtemp, (address) &BytecodeCounter::_counter_value);
1650 __ mov_slow(stop_at, StopInterpreterAt);
1651
1652 // test bytecode counter
1653 __ cmp(Rtemp, stop_at);
1654 __ b(Lcontinue, ne);
1655
1656 __ trace_state("stop_interpreter_at");
1657 __ breakpoint();
1658
1659 __ bind(Lcontinue);
1660 }
1661 #endif // !PRODUCT