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 address TemplateInterpreterGenerator::generate_cont_resume_interpreter_adapter() {
463 return nullptr;
464 }
465
466
467 // Helpers for commoning out cases in the various type of method entries.
468 //
469
470 // increment invocation count & check for overflow
471 //
472 // Note: checking for negative value instead of overflow
473 // so we have a 'sticky' overflow test
474 //
475 // In: Rmethod.
476 //
477 // Uses R0, R1, Rtemp.
478 //
479 void TemplateInterpreterGenerator::generate_counter_incr(Label* overflow) {
480 Label done;
481 const Register Rcounters = Rtemp;
482 const Address invocation_counter(Rcounters,
483 MethodCounters::invocation_counter_offset() +
484 InvocationCounter::counter_offset());
485
486 // Note: In tiered we increment either counters in MethodCounters* or
487 // in MDO depending if we're profiling or not.
488 int increment = InvocationCounter::count_increment;
489 Label no_mdo;
490 if (ProfileInterpreter) {
491 // Are we profiling?
492 __ ldr(R1_tmp, Address(Rmethod, Method::method_data_offset()));
493 __ cbz(R1_tmp, no_mdo);
494 // Increment counter in the MDO
495 const Address mdo_invocation_counter(R1_tmp,
496 in_bytes(MethodData::invocation_counter_offset()) +
497 in_bytes(InvocationCounter::counter_offset()));
498 const Address mask(R1_tmp, in_bytes(MethodData::invoke_mask_offset()));
499 __ increment_mask_and_jump(mdo_invocation_counter, increment, mask, R0_tmp, Rtemp, eq, overflow);
500 __ b(done);
501 }
502 __ bind(no_mdo);
503 __ get_method_counters(Rmethod, Rcounters, done);
504 const Address mask(Rcounters, in_bytes(MethodCounters::invoke_mask_offset()));
505 __ increment_mask_and_jump(invocation_counter, increment, mask, R0_tmp, R1_tmp, eq, overflow);
506 __ bind(done);
507 }
508
509 void TemplateInterpreterGenerator::generate_counter_overflow(Label& do_continue) {
510 // InterpreterRuntime::frequency_counter_overflow takes one argument
511 // indicating if the counter overflow occurs at a backwards branch (non-null bcp).
512 // The call returns the address of the verified entry point for the method or null
513 // if the compilation did not complete (either went background or bailed out).
514 __ mov(R1, (int)false);
515 __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::frequency_counter_overflow), R1);
516
517 // jump to the interpreted entry.
518 __ b(do_continue);
519 }
520
521 void TemplateInterpreterGenerator::generate_stack_overflow_check(void) {
522 // Check if we've got enough room on the stack for
523 // - overhead;
524 // - locals;
525 // - expression stack.
526 //
527 // Registers on entry:
528 //
529 // R3 = number of additional locals
530 // Rthread
531 // Rmethod
532 // Registers used: R0, R1, R2, Rtemp.
533
534 const Register Radditional_locals = R3;
535 const Register RmaxStack = R2;
536
537 // monitor entry size
538 const int entry_size = frame::interpreter_frame_monitor_size_in_bytes();
539
540 // total overhead size: entry_size + (saved registers, thru expr stack bottom).
541 // be sure to change this if you add/subtract anything to/from the overhead area
542 const int overhead_size = (frame::sender_sp_offset - frame::interpreter_frame_initial_sp_offset)*wordSize + entry_size;
543
544 // Pages reserved for VM runtime calls and subsequent Java calls.
545 const int reserved_pages = StackOverflow::stack_shadow_zone_size();
546
547 // Thread::stack_size() includes guard pages, and they should not be touched.
548 const int guard_pages = StackOverflow::stack_guard_zone_size();
549
550 __ ldr(R0, Address(Rthread, Thread::stack_base_offset()));
551 __ ldr(R1, Address(Rthread, Thread::stack_size_offset()));
552 __ ldr(Rtemp, Address(Rmethod, Method::const_offset()));
553 __ ldrh(RmaxStack, Address(Rtemp, ConstMethod::max_stack_offset()));
554 __ sub_slow(Rtemp, SP, overhead_size + reserved_pages + guard_pages + Method::extra_stack_words());
555
556 // reserve space for additional locals
557 __ sub(Rtemp, Rtemp, AsmOperand(Radditional_locals, lsl, Interpreter::logStackElementSize));
558
559 // stack size
560 __ sub(R0, R0, R1);
561
562 // reserve space for expression stack
563 __ sub(Rtemp, Rtemp, AsmOperand(RmaxStack, lsl, Interpreter::logStackElementSize));
564
565 __ cmp(Rtemp, R0);
566
567 __ mov(SP, Rsender_sp, ls); // restore SP
568 __ b(SharedRuntime::throw_StackOverflowError_entry(), ls);
569 }
570
571
572 // Allocate monitor and lock method (asm interpreter)
573 //
574 void TemplateInterpreterGenerator::lock_method() {
575 // synchronize method
576
577 const int entry_size = frame::interpreter_frame_monitor_size_in_bytes();
578 assert ((entry_size % StackAlignmentInBytes) == 0, "should keep stack alignment");
579
580 #ifdef ASSERT
581 { Label L;
582 __ ldr_u32(Rtemp, Address(Rmethod, Method::access_flags_offset()));
583 __ tbnz(Rtemp, JVM_ACC_SYNCHRONIZED_BIT, L);
584 __ stop("method doesn't need synchronization");
585 __ bind(L);
586 }
587 #endif // ASSERT
588
589 // get synchronization object
590 { Label done;
591 __ ldr_u32(Rtemp, Address(Rmethod, Method::access_flags_offset()));
592 __ tst(Rtemp, JVM_ACC_STATIC);
593 __ ldr(R0, Address(Rlocals, Interpreter::local_offset_in_bytes(0)), eq); // get receiver (assume this is frequent case)
594 __ b(done, eq);
595 __ load_mirror(R0, Rmethod, Rtemp);
596 __ bind(done);
597 }
598
599 // add space for monitor & lock
600
601
602 __ sub(Rstack_top, Rstack_top, entry_size);
603 __ check_stack_top_on_expansion();
604 // add space for a monitor entry
605 __ str(Rstack_top, Address(FP, frame::interpreter_frame_monitor_block_top_offset * wordSize));
606 // set new monitor block top
607 __ str(R0, Address(Rstack_top, BasicObjectLock::obj_offset()));
608 // store object
609 __ mov(R1, Rstack_top); // monitor entry address
610 __ lock_object(R1);
611 }
612
613
614 //
615 // Generate a fixed interpreter frame. This is identical setup for interpreted methods
616 // and for native methods hence the shared code.
617
618 void TemplateInterpreterGenerator::generate_fixed_frame(bool native_call) {
619 // Generates the following stack layout:
620 //
621 // [ expr. stack bottom ]
622 // [ saved Rbcp ]
623 // [ current Rlocals ]
624 // [ cache ]
625 // [ mdx ]
626 // [ Method* ]
627 // [ last_sp ]
628 // [ sender_sp ]
629 // [ saved FP ] <--- FP
630 // [ saved LR ]
631
632 // initialize fixed part of activation frame
633 __ push(LR); // save return address
634 __ push(FP); // save FP
635 __ mov(FP, SP); // establish new FP
636
637 __ push(Rsender_sp);
638
639 __ mov(R0, 0);
640 __ push(R0); // leave last_sp as null
641
642 // setup Rbcp
643 if (native_call) {
644 __ mov(Rbcp, 0); // bcp = 0 for native calls
645 } else {
646 __ ldr(Rtemp, Address(Rmethod, Method::const_offset())); // get ConstMethod*
647 __ add(Rbcp, Rtemp, ConstMethod::codes_offset()); // get codebase
648 }
649
650 __ push(Rmethod); // save Method*
651 // Get mirror and store it in the frame as GC root for this Method*
652 __ load_mirror(Rtemp, Rmethod, Rtemp);
653 __ push(Rtemp);
654
655 if (ProfileInterpreter) {
656 __ ldr(Rtemp, Address(Rmethod, Method::method_data_offset()));
657 __ tst(Rtemp, Rtemp);
658 __ add(Rtemp, Rtemp, in_bytes(MethodData::data_offset()), ne);
659 __ push(Rtemp); // set the mdp (method data pointer)
660 } else {
661 __ push(R0);
662 }
663
664 __ ldr(Rtemp, Address(Rmethod, Method::const_offset()));
665 __ ldr(Rtemp, Address(Rtemp, ConstMethod::constants_offset()));
666 __ ldr(Rtemp, Address(Rtemp, ConstantPool::cache_offset()));
667 __ push(Rtemp); // set constant pool cache
668 __ sub(Rtemp, Rlocals, FP);
669 __ logical_shift_right(Rtemp, Rtemp, Interpreter::logStackElementSize); // Rtemp = Rlocals - fp();
670 __ push(Rtemp); // set relativized Rlocals, see frame::interpreter_frame_locals()
671 __ push(Rbcp); // set bcp
672 __ push(R0); // reserve word for pointer to expression stack bottom
673 __ str(SP, Address(SP, 0)); // set expression stack bottom
674 }
675
676
677 // End of helpers
678
679 //------------------------------------------------------------------------------------------------------------------------
680 // Entry points
681 //
682 // Here we generate the various kind of entries into the interpreter.
683 // The two main entry type are generic bytecode methods and native call method.
684 // These both come in synchronized and non-synchronized versions but the
685 // frame layout they create is very similar. The other method entry
686 // types are really just special purpose entries that are really entry
687 // and interpretation all in one. These are for trivial methods like
688 // accessor, empty, or special math methods.
689 //
690 // When control flow reaches any of the entry types for the interpreter
691 // the following holds ->
692 //
693 // Arguments:
694 //
695 // Rmethod: Method*
696 // Rthread: thread
697 // Rsender_sp: sender sp
698 // Rparams (SP on 32-bit ARM): pointer to method parameters
699 //
700 // LR: return address
701 //
702 // Stack layout immediately at entry
703 //
704 // [ parameter n ] <--- Rparams (SP on 32-bit ARM)
705 // ...
706 // [ parameter 1 ]
707 // [ expression stack ] (caller's java expression stack)
708
709 // Assuming that we don't go to one of the trivial specialized
710 // entries the stack will look like below when we are ready to execute
711 // the first bytecode (or call the native routine). The register usage
712 // will be as the template based interpreter expects.
713 //
714 // local variables follow incoming parameters immediately; i.e.
715 // the return address is saved at the end of the locals.
716 //
717 // [ expr. stack ] <--- Rstack_top (SP on 32-bit ARM)
718 // [ monitor entry ]
719 // ...
720 // [ monitor entry ]
721 // [ expr. stack bottom ]
722 // [ saved Rbcp ]
723 // [ current Rlocals ]
724 // [ cache ]
725 // [ mdx ]
726 // [ mirror ]
727 // [ Method* ]
728 //
729 // 32-bit ARM:
730 // [ last_sp ]
731 //
732 // [ sender_sp ]
733 // [ saved FP ] <--- FP
734 // [ saved LR ]
735 // [ optional padding(*)]
736 // [ local variable m ]
737 // ...
738 // [ local variable 1 ]
739 // [ parameter n ]
740 // ...
741 // [ parameter 1 ] <--- Rlocals
742 //
743
744 address TemplateInterpreterGenerator::generate_Reference_get_entry(void) {
745 // Code: _aload_0, _getfield, _areturn
746 // parameter size = 1
747 //
748 // The code that gets generated by this routine is split into 2 parts:
749 // 1. The "intrinsified" code performing an ON_WEAK_OOP_REF load,
750 // 2. The slow path - which is an expansion of the regular method entry.
751 //
752 // Notes:-
753 // * An intrinsic is always executed, where an ON_WEAK_OOP_REF load is performed.
754 // * We may jump to the slow path iff the receiver is null. If the
755 // Reference object is null then we no longer perform an ON_WEAK_OOP_REF load
756 // Thus we can use the regular method entry code to generate the NPE.
757 //
758 // Rmethod: Method*
759 // Rthread: thread
760 // Rsender_sp: sender sp, must be preserved for slow path, set SP to it on fast path
761 // Rparams: parameters
762
763 address entry = __ pc();
764 Label slow_path;
765 const Register Rthis = R0;
766 const Register Rret_addr = Rtmp_save1;
767 assert_different_registers(Rthis, Rret_addr, Rsender_sp);
768
769 const int referent_offset = java_lang_ref_Reference::referent_offset();
770
771 // Check if local 0 != nullptr
772 // If the receiver is null then it is OK to jump to the slow path.
773 __ ldr(Rthis, Address(Rparams));
774 __ cbz(Rthis, slow_path);
775
776 // Preserve LR
777 __ mov(Rret_addr, LR);
778
779 // Load the value of the referent field.
780 const Address field_address(Rthis, referent_offset);
781 __ load_heap_oop(R0, field_address, Rtemp, R1_tmp, R2_tmp, ON_WEAK_OOP_REF);
782
783 // _areturn
784 __ mov(SP, Rsender_sp);
785 __ ret(Rret_addr);
786
787 // generate a vanilla interpreter entry as the slow path
788 __ bind(slow_path);
789 __ jump_to_entry(Interpreter::entry_for_kind(Interpreter::zerolocals));
790 return entry;
791 }
792
793 // Not supported
794 address TemplateInterpreterGenerator::generate_currentThread() { return nullptr; }
795 address TemplateInterpreterGenerator::generate_CRC32_update_entry() { return nullptr; }
796 address TemplateInterpreterGenerator::generate_CRC32_updateBytes_entry(AbstractInterpreter::MethodKind kind) { return nullptr; }
797 address TemplateInterpreterGenerator::generate_CRC32C_updateBytes_entry(AbstractInterpreter::MethodKind kind) { return nullptr; }
798 address TemplateInterpreterGenerator::generate_Float_intBitsToFloat_entry() { return nullptr; }
799 address TemplateInterpreterGenerator::generate_Float_floatToRawIntBits_entry() { return nullptr; }
800 address TemplateInterpreterGenerator::generate_Double_longBitsToDouble_entry() { return nullptr; }
801 address TemplateInterpreterGenerator::generate_Double_doubleToRawLongBits_entry() { return nullptr; }
802 address TemplateInterpreterGenerator::generate_Float_float16ToFloat_entry() { return nullptr; }
803 address TemplateInterpreterGenerator::generate_Float_floatToFloat16_entry() { return nullptr; }
804
805 //
806 // Interpreter stub for calling a native method. (asm interpreter)
807 // This sets up a somewhat different looking stack for calling the native method
808 // than the typical interpreter frame setup.
809 //
810
811 address TemplateInterpreterGenerator::generate_native_entry(bool synchronized) {
812 // determine code generation flags
813 bool inc_counter = UseCompiler || CountCompiledCalls;
814
815 // Incoming registers:
816 //
817 // Rmethod: Method*
818 // Rthread: thread
819 // Rsender_sp: sender sp
820 // Rparams: parameters
821
822 address entry_point = __ pc();
823
824 // Register allocation
825 const Register Rsize_of_params = R6;
826 const Register Rsig_handler = Rtmp_save0; // R4
827 const Register Rnative_code = Rtmp_save1; // R5
828 const Register Rresult_handler = R6;
829
830 const Register Rsaved_result_lo = Rtmp_save0; // R4
831 const Register Rsaved_result_hi = Rtmp_save1; // R5
832 FloatRegister saved_result_fp;
833
834
835 __ ldr(Rsize_of_params, Address(Rmethod, Method::const_offset()));
836 __ ldrh(Rsize_of_params, Address(Rsize_of_params, ConstMethod::size_of_parameters_offset()));
837
838 // native calls don't need the stack size check since they have no expression stack
839 // and the arguments are already on the stack and we only add a handful of words
840 // to the stack
841
842 // compute beginning of parameters (Rlocals)
843 __ sub(Rlocals, Rparams, wordSize);
844 __ add(Rlocals, Rlocals, AsmOperand(Rsize_of_params, lsl, Interpreter::logStackElementSize));
845
846 // reserve stack space for oop_temp
847 __ mov(R0, 0);
848 __ push(R0);
849
850 generate_fixed_frame(true); // Note: R9 is now saved in the frame
851
852 // make sure method is native & not abstract
853 #ifdef ASSERT
854 __ ldr_u32(Rtemp, Address(Rmethod, Method::access_flags_offset()));
855 {
856 Label L;
857 __ tbnz(Rtemp, JVM_ACC_NATIVE_BIT, L);
858 __ stop("tried to execute non-native method as native");
859 __ bind(L);
860 }
861 { Label L;
862 __ tbz(Rtemp, JVM_ACC_ABSTRACT_BIT, L);
863 __ stop("tried to execute abstract method in interpreter");
864 __ bind(L);
865 }
866 #endif
867
868 // increment invocation count & check for overflow
869 Label invocation_counter_overflow;
870 if (inc_counter) {
871 if (synchronized) {
872 // Avoid unlocking method's monitor in case of exception, as it has not
873 // been locked yet.
874 __ set_do_not_unlock_if_synchronized(true, Rtemp);
875 }
876 generate_counter_incr(&invocation_counter_overflow);
877 }
878
879 Label continue_after_compile;
880 __ bind(continue_after_compile);
881
882 if (inc_counter && synchronized) {
883 __ set_do_not_unlock_if_synchronized(false, Rtemp);
884 }
885
886 // check for synchronized methods
887 // Must happen AFTER invocation_counter check and stack overflow check,
888 // so method is not locked if overflows.
889 //
890 if (synchronized) {
891 lock_method();
892 } else {
893 // no synchronization necessary
894 #ifdef ASSERT
895 { Label L;
896 __ ldr_u32(Rtemp, Address(Rmethod, Method::access_flags_offset()));
897 __ tbz(Rtemp, JVM_ACC_SYNCHRONIZED_BIT, L);
898 __ stop("method needs synchronization");
899 __ bind(L);
900 }
901 #endif
902 }
903
904 // start execution
905 #ifdef ASSERT
906 { Label L;
907 __ ldr(Rtemp, Address(FP, frame::interpreter_frame_monitor_block_top_offset * wordSize));
908 __ cmp(Rtemp, Rstack_top);
909 __ b(L, eq);
910 __ stop("broken stack frame setup in interpreter 3");
911 __ bind(L);
912 }
913 #endif
914 __ check_extended_sp(Rtemp);
915
916 // jvmti/dtrace support
917 __ notify_method_entry();
918 #if R9_IS_SCRATCHED
919 __ restore_method();
920 #endif
921
922 {
923 Label L;
924 __ ldr(Rsig_handler, Address(Rmethod, Method::signature_handler_offset()));
925 __ cbnz(Rsig_handler, L);
926 __ mov(R1, Rmethod);
927 __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::prepare_native_call), R1, true);
928 __ ldr(Rsig_handler, Address(Rmethod, Method::signature_handler_offset()));
929 __ bind(L);
930 }
931
932 {
933 Label L;
934 __ ldr(Rnative_code, Address(Rmethod, Method::native_function_offset()));
935 __ cbnz(Rnative_code, L);
936 __ mov(R1, Rmethod);
937 __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::prepare_native_call), R1);
938 __ ldr(Rnative_code, Address(Rmethod, Method::native_function_offset()));
939 __ bind(L);
940 }
941
942 // Allocate stack space for arguments
943
944
945 // C functions need aligned stack
946 __ bic(SP, SP, StackAlignmentInBytes - 1);
947 // Multiply by BytesPerLong instead of BytesPerWord, because calling convention
948 // may require empty slots due to long alignment, e.g. func(int, jlong, int, jlong)
949 __ sub(SP, SP, AsmOperand(Rsize_of_params, lsl, LogBytesPerLong));
950
951 #ifdef __ABI_HARD__
952 // Allocate more stack space to accommodate all GP as well as FP registers:
953 // 4 * wordSize
954 // 8 * BytesPerLong
955 int reg_arguments = align_up((4*wordSize) + (8*BytesPerLong), StackAlignmentInBytes);
956 #else
957 // Reserve at least 4 words on the stack for loading
958 // of parameters passed on registers (R0-R3).
959 // See generate_slow_signature_handler().
960 // It is also used for JNIEnv & class additional parameters.
961 int reg_arguments = 4 * wordSize;
962 #endif // __ABI_HARD__
963
964 __ sub(SP, SP, reg_arguments);
965
966
967 // Note: signature handler blows R4 besides all scratch registers.
968 // See AbstractInterpreterGenerator::generate_slow_signature_handler().
969 __ call(Rsig_handler);
970 #if R9_IS_SCRATCHED
971 __ restore_method();
972 #endif
973 __ mov(Rresult_handler, R0);
974
975 // Pass JNIEnv and mirror for static methods
976 {
977 Label L;
978 __ ldr_u32(Rtemp, Address(Rmethod, Method::access_flags_offset()));
979 __ add(R0, Rthread, in_bytes(JavaThread::jni_environment_offset()));
980 __ tbz(Rtemp, JVM_ACC_STATIC_BIT, L);
981 __ load_mirror(Rtemp, Rmethod, Rtemp);
982 __ add(R1, FP, frame::interpreter_frame_oop_temp_offset * wordSize);
983 __ str(Rtemp, Address(R1, 0));
984 __ bind(L);
985 }
986
987 __ set_last_Java_frame(SP, FP, true, Rtemp);
988
989 // Changing state to _thread_in_native must be the last thing to do
990 // before the jump to native code. At this moment stack must be
991 // safepoint-safe and completely prepared for stack walking.
992 #ifdef ASSERT
993 {
994 Label L;
995 __ ldr_u32(Rtemp, Address(Rthread, JavaThread::thread_state_offset()));
996 __ cmp_32(Rtemp, _thread_in_Java);
997 __ b(L, eq);
998 __ stop("invalid thread state");
999 __ bind(L);
1000 }
1001 #endif
1002
1003 // Force all preceding writes to be observed prior to thread state change
1004 __ membar(MacroAssembler::StoreStore, Rtemp);
1005
1006 __ mov(Rtemp, _thread_in_native);
1007 __ str(Rtemp, Address(Rthread, JavaThread::thread_state_offset()));
1008
1009 __ call(Rnative_code);
1010 #if R9_IS_SCRATCHED
1011 __ restore_method();
1012 #endif
1013
1014 // Set FPSCR/FPCR to a known state
1015 if (AlwaysRestoreFPU) {
1016 __ restore_default_fp_mode();
1017 }
1018
1019 // Do safepoint check
1020 __ mov(Rtemp, _thread_in_native_trans);
1021 __ str_32(Rtemp, Address(Rthread, JavaThread::thread_state_offset()));
1022
1023 // Force this write out before the read below
1024 if (!UseSystemMemoryBarrier) {
1025 __ membar(MacroAssembler::StoreLoad, Rtemp);
1026 }
1027
1028 // Protect the return value in the interleaved code: save it to callee-save registers.
1029 __ mov(Rsaved_result_lo, R0);
1030 __ mov(Rsaved_result_hi, R1);
1031 #ifdef __ABI_HARD__
1032 // preserve native FP result in a callee-saved register
1033 saved_result_fp = D8;
1034 __ fcpyd(saved_result_fp, D0);
1035 #else
1036 saved_result_fp = fnoreg;
1037 #endif // __ABI_HARD__
1038
1039 {
1040 Label call, skip_call;
1041 __ safepoint_poll(Rtemp, call);
1042 __ ldr_u32(R3, Address(Rthread, JavaThread::suspend_flags_offset()));
1043 __ cmp(R3, 0);
1044 __ b(skip_call, eq);
1045 __ bind(call);
1046 __ mov(R0, Rthread);
1047 __ call(CAST_FROM_FN_PTR(address, JavaThread::check_special_condition_for_native_trans), relocInfo::none);
1048 __ bind(skip_call);
1049
1050 #if R9_IS_SCRATCHED
1051 __ restore_method();
1052 #endif
1053 }
1054
1055 // Perform Native->Java thread transition
1056 __ mov(Rtemp, _thread_in_Java);
1057 __ str_32(Rtemp, Address(Rthread, JavaThread::thread_state_offset()));
1058
1059 // Zero handles and last_java_sp
1060 __ reset_last_Java_frame(Rtemp);
1061 __ ldr(R3, Address(Rthread, JavaThread::active_handles_offset()));
1062 __ str_32(__ zero_register(Rtemp), Address(R3, JNIHandleBlock::top_offset()));
1063 if (CheckJNICalls) {
1064 __ str(__ zero_register(Rtemp), Address(Rthread, JavaThread::pending_jni_exception_check_fn_offset()));
1065 }
1066
1067 // Unbox oop result, e.g. JNIHandles::resolve result if it's an oop.
1068 {
1069 Label Lnot_oop;
1070 __ mov_slow(Rtemp, AbstractInterpreter::result_handler(T_OBJECT));
1071 __ cmp(Rtemp, Rresult_handler);
1072 __ b(Lnot_oop, ne);
1073 Register value = Rsaved_result_lo;
1074 __ resolve_jobject(value, // value
1075 Rtemp, // tmp1
1076 R1_tmp); // tmp2
1077 // Store resolved result in frame for GC visibility.
1078 __ str(value, Address(FP, frame::interpreter_frame_oop_temp_offset * wordSize));
1079 __ bind(Lnot_oop);
1080 }
1081
1082
1083 // reguard stack if StackOverflow exception happened while in native.
1084 {
1085 __ ldr_u32(Rtemp, Address(Rthread, JavaThread::stack_guard_state_offset()));
1086 __ cmp_32(Rtemp, StackOverflow::stack_guard_yellow_reserved_disabled);
1087 __ call(CAST_FROM_FN_PTR(address, SharedRuntime::reguard_yellow_pages), relocInfo::none, eq);
1088 #if R9_IS_SCRATCHED
1089 __ restore_method();
1090 #endif
1091 }
1092
1093 // check pending exceptions
1094 {
1095 __ ldr(Rtemp, Address(Rthread, Thread::pending_exception_offset()));
1096 __ cmp(Rtemp, 0);
1097 __ mov(Rexception_pc, PC, ne);
1098 __ b(StubRoutines::forward_exception_entry(), ne);
1099 }
1100
1101 if (synchronized) {
1102 // address of first monitor
1103 __ sub(R0, FP, - (frame::interpreter_frame_monitor_block_bottom_offset - frame::interpreter_frame_monitor_size()) * wordSize);
1104 __ unlock_object(R0);
1105 }
1106
1107 // jvmti/dtrace support
1108 // Note: This must happen _after_ handling/throwing any exceptions since
1109 // the exception handler code notifies the runtime of method exits
1110 // too. If this happens before, method entry/exit notifications are
1111 // not properly paired (was bug - gri 11/22/99).
1112 __ notify_method_exit(vtos, InterpreterMacroAssembler::NotifyJVMTI, true, Rsaved_result_lo, Rsaved_result_hi, saved_result_fp);
1113
1114 // Restore the result. Oop result is restored from the stack by the
1115 // result handler.
1116 __ mov(R0, Rsaved_result_lo);
1117 __ mov(R1, Rsaved_result_hi);
1118
1119 #ifdef __ABI_HARD__
1120 // reload native FP result
1121 __ fcpyd(D0, D8);
1122 #endif // __ABI_HARD__
1123
1124 __ blx(Rresult_handler);
1125
1126 // Restore FP/LR, sender_sp and return
1127 __ mov(Rtemp, FP);
1128 __ ldmia(FP, RegisterSet(FP) | RegisterSet(LR));
1129 __ ldr(SP, Address(Rtemp, frame::interpreter_frame_sender_sp_offset * wordSize));
1130
1131 __ ret();
1132
1133 if (inc_counter) {
1134 // Handle overflow of counter and compile method
1135 __ bind(invocation_counter_overflow);
1136 generate_counter_overflow(continue_after_compile);
1137 }
1138
1139 return entry_point;
1140 }
1141
1142 //
1143 // Generic interpreted method entry to (asm) interpreter
1144 //
1145 address TemplateInterpreterGenerator::generate_normal_entry(bool synchronized) {
1146 // determine code generation flags
1147 bool inc_counter = UseCompiler || CountCompiledCalls;
1148
1149 // Rmethod: Method*
1150 // Rthread: thread
1151 // Rsender_sp: sender sp (could differ from SP if we were called via c2i)
1152 // Rparams: pointer to the last parameter in the stack
1153
1154 address entry_point = __ pc();
1155
1156 const Register RconstMethod = R3;
1157
1158
1159 __ ldr(RconstMethod, Address(Rmethod, Method::const_offset()));
1160
1161 __ ldrh(R2, Address(RconstMethod, ConstMethod::size_of_parameters_offset()));
1162 __ ldrh(R3, Address(RconstMethod, ConstMethod::size_of_locals_offset()));
1163
1164 // setup Rlocals
1165 __ sub(Rlocals, Rparams, wordSize);
1166 __ add(Rlocals, Rlocals, AsmOperand(R2, lsl, Interpreter::logStackElementSize));
1167
1168 __ sub(R3, R3, R2); // number of additional locals
1169
1170
1171 // see if we've got enough room on the stack for locals plus overhead.
1172 generate_stack_overflow_check();
1173
1174 // allocate space for locals
1175 // explicitly initialize locals
1176
1177 // Loop is unrolled 4 times
1178 Label loop;
1179 __ mov(R0, 0);
1180 __ bind(loop);
1181
1182 // #1
1183 __ subs(R3, R3, 1);
1184 __ push(R0, ge);
1185
1186 // #2
1187 __ subs(R3, R3, 1, ge);
1188 __ push(R0, ge);
1189
1190 // #3
1191 __ subs(R3, R3, 1, ge);
1192 __ push(R0, ge);
1193
1194 // #4
1195 __ subs(R3, R3, 1, ge);
1196 __ push(R0, ge);
1197
1198 __ b(loop, gt);
1199
1200 // initialize fixed part of activation frame
1201 generate_fixed_frame(false);
1202
1203 __ restore_dispatch();
1204
1205 // make sure method is not native & not abstract
1206 #ifdef ASSERT
1207 __ ldr_u32(Rtemp, Address(Rmethod, Method::access_flags_offset()));
1208 {
1209 Label L;
1210 __ tbz(Rtemp, JVM_ACC_NATIVE_BIT, L);
1211 __ stop("tried to execute native method as non-native");
1212 __ bind(L);
1213 }
1214 { Label L;
1215 __ tbz(Rtemp, JVM_ACC_ABSTRACT_BIT, L);
1216 __ stop("tried to execute abstract method in interpreter");
1217 __ bind(L);
1218 }
1219 #endif
1220
1221 // increment invocation count & check for overflow
1222 Label invocation_counter_overflow;
1223 if (inc_counter) {
1224 if (synchronized) {
1225 // Avoid unlocking method's monitor in case of exception, as it has not
1226 // been locked yet.
1227 __ set_do_not_unlock_if_synchronized(true, Rtemp);
1228 }
1229 generate_counter_incr(&invocation_counter_overflow);
1230 }
1231 Label continue_after_compile;
1232 __ bind(continue_after_compile);
1233
1234 if (inc_counter && synchronized) {
1235 __ set_do_not_unlock_if_synchronized(false, Rtemp);
1236 }
1237 #if R9_IS_SCRATCHED
1238 __ restore_method();
1239 #endif
1240
1241 // check for synchronized methods
1242 // Must happen AFTER invocation_counter check and stack overflow check,
1243 // so method is not locked if overflows.
1244 //
1245 if (synchronized) {
1246 // Allocate monitor and lock method
1247 lock_method();
1248 } else {
1249 // no synchronization necessary
1250 #ifdef ASSERT
1251 { Label L;
1252 __ ldr_u32(Rtemp, Address(Rmethod, Method::access_flags_offset()));
1253 __ tbz(Rtemp, JVM_ACC_SYNCHRONIZED_BIT, L);
1254 __ stop("method needs synchronization");
1255 __ bind(L);
1256 }
1257 #endif
1258 }
1259
1260 // start execution
1261 #ifdef ASSERT
1262 { Label L;
1263 __ ldr(Rtemp, Address(FP, frame::interpreter_frame_monitor_block_top_offset * wordSize));
1264 __ cmp(Rtemp, Rstack_top);
1265 __ b(L, eq);
1266 __ stop("broken stack frame setup in interpreter 4");
1267 __ bind(L);
1268 }
1269 #endif
1270 __ check_extended_sp(Rtemp);
1271
1272 // jvmti support
1273 __ notify_method_entry();
1274 #if R9_IS_SCRATCHED
1275 __ restore_method();
1276 #endif
1277
1278 __ dispatch_next(vtos);
1279
1280 // invocation counter overflow
1281 if (inc_counter) {
1282 // Handle overflow of counter and compile method
1283 __ bind(invocation_counter_overflow);
1284 generate_counter_overflow(continue_after_compile);
1285 }
1286
1287 return entry_point;
1288 }
1289
1290 //------------------------------------------------------------------------------------------------------------------------
1291 // Exceptions
1292
1293 void TemplateInterpreterGenerator::generate_throw_exception() {
1294 // Entry point in previous activation (i.e., if the caller was interpreted)
1295 Interpreter::_rethrow_exception_entry = __ pc();
1296 // Rexception_obj: exception
1297
1298 // Clear interpreter_frame_last_sp.
1299 __ mov(Rtemp, 0);
1300 __ str(Rtemp, Address(FP, frame::interpreter_frame_last_sp_offset * wordSize));
1301
1302 #if R9_IS_SCRATCHED
1303 __ restore_method();
1304 #endif
1305 __ restore_bcp();
1306 __ restore_dispatch();
1307 __ restore_locals();
1308
1309
1310 // Entry point for exceptions thrown within interpreter code
1311 Interpreter::_throw_exception_entry = __ pc();
1312
1313 // expression stack is undefined here
1314 // Rexception_obj: exception
1315 // Rbcp: exception bcp
1316 __ verify_oop(Rexception_obj);
1317
1318 // expression stack must be empty before entering the VM in case of an exception
1319 __ empty_expression_stack();
1320 // find exception handler address and preserve exception oop
1321 __ mov(R1, Rexception_obj);
1322 __ call_VM(Rexception_obj, CAST_FROM_FN_PTR(address, InterpreterRuntime::exception_handler_for_exception), R1);
1323 // R0: exception handler entry point
1324 // Rexception_obj: preserved exception oop
1325 // Rbcp: bcp for exception handler
1326 __ push_ptr(Rexception_obj); // push exception which is now the only value on the stack
1327 __ jump(R0); // jump to exception handler (may be _remove_activation_entry!)
1328
1329 // If the exception is not handled in the current frame the frame is removed and
1330 // the exception is rethrown (i.e. exception continuation is _rethrow_exception).
1331 //
1332 // Note: At this point the bci is still the bxi for the instruction which caused
1333 // the exception and the expression stack is empty. Thus, for any VM calls
1334 // at this point, GC will find a legal oop map (with empty expression stack).
1335
1336 // In current activation
1337 // tos: exception
1338 // Rbcp: exception bcp
1339
1340 //
1341 // JVMTI PopFrame support
1342 //
1343 Interpreter::_remove_activation_preserving_args_entry = __ pc();
1344
1345
1346 __ empty_expression_stack();
1347
1348 // Set the popframe_processing bit in _popframe_condition indicating that we are
1349 // currently handling popframe, so that call_VMs that may happen later do not trigger new
1350 // popframe handling cycles.
1351
1352 __ ldr_s32(Rtemp, Address(Rthread, JavaThread::popframe_condition_offset()));
1353 __ orr(Rtemp, Rtemp, (unsigned)JavaThread::popframe_processing_bit);
1354 __ str_32(Rtemp, Address(Rthread, JavaThread::popframe_condition_offset()));
1355
1356 {
1357 // Check to see whether we are returning to a deoptimized frame.
1358 // (The PopFrame call ensures that the caller of the popped frame is
1359 // either interpreted or compiled and deoptimizes it if compiled.)
1360 // In this case, we can't call dispatch_next() after the frame is
1361 // popped, but instead must save the incoming arguments and restore
1362 // them after deoptimization has occurred.
1363 //
1364 // Note that we don't compare the return PC against the
1365 // deoptimization blob's unpack entry because of the presence of
1366 // adapter frames in C2.
1367 Label caller_not_deoptimized;
1368 __ ldr(R0, Address(FP, frame::return_addr_offset * wordSize));
1369 __ call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::interpreter_contains), R0);
1370 __ cbnz_32(R0, caller_not_deoptimized);
1371
1372 // Compute size of arguments for saving when returning to deoptimized caller
1373 __ restore_method();
1374 __ ldr(R0, Address(Rmethod, Method::const_offset()));
1375 __ ldrh(R0, Address(R0, ConstMethod::size_of_parameters_offset()));
1376
1377 __ logical_shift_left(R1, R0, Interpreter::logStackElementSize);
1378 // Save these arguments
1379 __ restore_locals();
1380 __ sub(R2, Rlocals, R1);
1381 __ add(R2, R2, wordSize);
1382 __ mov(R0, Rthread);
1383 __ call_VM_leaf(CAST_FROM_FN_PTR(address, Deoptimization::popframe_preserve_args), R0, R1, R2);
1384
1385 __ remove_activation(vtos, LR,
1386 /* throw_monitor_exception */ false,
1387 /* install_monitor_exception */ false,
1388 /* notify_jvmdi */ false);
1389
1390 // Inform deoptimization that it is responsible for restoring these arguments
1391 __ mov(Rtemp, JavaThread::popframe_force_deopt_reexecution_bit);
1392 __ str_32(Rtemp, Address(Rthread, JavaThread::popframe_condition_offset()));
1393
1394 // Continue in deoptimization handler
1395 __ ret();
1396
1397 __ bind(caller_not_deoptimized);
1398 }
1399
1400 __ remove_activation(vtos, R4,
1401 /* throw_monitor_exception */ false,
1402 /* install_monitor_exception */ false,
1403 /* notify_jvmdi */ false);
1404
1405 // Finish with popframe handling
1406 // A previous I2C followed by a deoptimization might have moved the
1407 // outgoing arguments further up the stack. PopFrame expects the
1408 // mutations to those outgoing arguments to be preserved and other
1409 // constraints basically require this frame to look exactly as
1410 // though it had previously invoked an interpreted activation with
1411 // no space between the top of the expression stack (current
1412 // last_sp) and the top of stack. Rather than force deopt to
1413 // maintain this kind of invariant all the time we call a small
1414 // fixup routine to move the mutated arguments onto the top of our
1415 // expression stack if necessary.
1416 __ mov(R1, SP);
1417 __ ldr(R2, Address(FP, frame::interpreter_frame_last_sp_offset * wordSize));
1418 // PC must point into interpreter here
1419 __ set_last_Java_frame(SP, FP, true, Rtemp);
1420 __ mov(R0, Rthread);
1421 __ call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::popframe_move_outgoing_args), R0, R1, R2);
1422 __ reset_last_Java_frame(Rtemp);
1423
1424 // Restore the last_sp and null it out
1425 __ ldr(SP, Address(FP, frame::interpreter_frame_last_sp_offset * wordSize));
1426 __ mov(Rtemp, (int)NULL_WORD);
1427 __ str(Rtemp, Address(FP, frame::interpreter_frame_last_sp_offset * wordSize));
1428
1429 __ restore_bcp();
1430 __ restore_dispatch();
1431 __ restore_locals();
1432 __ restore_method();
1433
1434 // The method data pointer was incremented already during
1435 // call profiling. We have to restore the mdp for the current bcp.
1436 if (ProfileInterpreter) {
1437 __ set_method_data_pointer_for_bcp();
1438 }
1439
1440 // Clear the popframe condition flag
1441 assert(JavaThread::popframe_inactive == 0, "adjust this code");
1442 __ str_32(__ zero_register(Rtemp), Address(Rthread, JavaThread::popframe_condition_offset()));
1443
1444 #if INCLUDE_JVMTI
1445 {
1446 Label L_done;
1447
1448 __ ldrb(Rtemp, Address(Rbcp, 0));
1449 __ cmp(Rtemp, Bytecodes::_invokestatic);
1450 __ b(L_done, ne);
1451
1452 // The member name argument must be restored if _invokestatic is re-executed after a PopFrame call.
1453 // Detect such a case in the InterpreterRuntime function and return the member name argument, or null.
1454
1455 // get local0
1456 __ ldr(R1, Address(Rlocals, 0));
1457 __ mov(R2, Rmethod);
1458 __ mov(R3, Rbcp);
1459 __ call_VM(R0, CAST_FROM_FN_PTR(address, InterpreterRuntime::member_name_arg_or_null), R1, R2, R3);
1460
1461 __ cbz(R0, L_done);
1462
1463 __ str(R0, Address(Rstack_top));
1464 __ bind(L_done);
1465 }
1466 #endif // INCLUDE_JVMTI
1467
1468 __ dispatch_next(vtos);
1469 // end of PopFrame support
1470
1471 Interpreter::_remove_activation_entry = __ pc();
1472
1473 // preserve exception over this code sequence
1474 __ pop_ptr(R0_tos);
1475 __ str(R0_tos, Address(Rthread, JavaThread::vm_result_offset()));
1476 // remove the activation (without doing throws on illegalMonitorExceptions)
1477 __ remove_activation(vtos, Rexception_pc, false, true, false);
1478 // restore exception
1479 __ get_vm_result(Rexception_obj, Rtemp);
1480
1481 // In between activations - previous activation type unknown yet
1482 // compute continuation point - the continuation point expects
1483 // the following registers set up:
1484 //
1485 // Rexception_obj: exception
1486 // Rexception_pc: return address/pc that threw exception
1487 // SP: expression stack of caller
1488 // FP: frame pointer of caller
1489 __ mov(c_rarg0, Rthread);
1490 __ mov(c_rarg1, Rexception_pc);
1491 __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::exception_handler_for_return_address), c_rarg0, c_rarg1);
1492 // Note that an "issuing PC" is actually the next PC after the call
1493
1494 __ jump(R0); // jump to exception handler of caller
1495 }
1496
1497
1498 //
1499 // JVMTI ForceEarlyReturn support
1500 //
1501 address TemplateInterpreterGenerator::generate_earlyret_entry_for(TosState state) {
1502 address entry = __ pc();
1503
1504
1505 __ restore_bcp();
1506 __ restore_dispatch();
1507 __ restore_locals();
1508
1509 __ empty_expression_stack();
1510
1511 __ load_earlyret_value(state);
1512
1513 // Clear the earlyret state
1514 __ ldr(Rtemp, Address(Rthread, JavaThread::jvmti_thread_state_offset()));
1515
1516 assert(JvmtiThreadState::earlyret_inactive == 0, "adjust this code");
1517 __ str_32(__ zero_register(R2), Address(Rtemp, JvmtiThreadState::earlyret_state_offset()));
1518
1519 __ remove_activation(state, LR,
1520 false, /* throw_monitor_exception */
1521 false, /* install_monitor_exception */
1522 true); /* notify_jvmdi */
1523
1524 // According to interpreter calling conventions, result is returned in R0/R1,
1525 // so ftos (S0) and dtos (D0) are moved to R0/R1.
1526 // This conversion should be done after remove_activation, as it uses
1527 // push(state) & pop(state) to preserve return value.
1528 __ convert_tos_to_retval(state);
1529 __ ret();
1530
1531 return entry;
1532 } // end of ForceEarlyReturn support
1533
1534
1535 //------------------------------------------------------------------------------------------------------------------------
1536 // Helper for vtos entry point generation
1537
1538 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) {
1539 assert(t->is_valid() && t->tos_in() == vtos, "illegal template");
1540 Label L;
1541
1542 #ifdef __SOFTFP__
1543 dep = __ pc(); // fall through
1544 #else
1545 fep = __ pc(); __ push(ftos); __ b(L);
1546 dep = __ pc(); __ push(dtos); __ b(L);
1547 #endif // __SOFTFP__
1548
1549 lep = __ pc(); __ push(ltos); __ b(L);
1550
1551 if (VerifyOops) { // can't share atos entry if VerifyOops
1552 aep = __ pc(); __ push(atos); __ b(L);
1553 } else {
1554 aep = __ pc(); // fall through
1555 }
1556
1557 #ifdef __SOFTFP__
1558 fep = __ pc(); // fall through
1559 #endif // __SOFTFP__
1560
1561 bep = cep = sep = // fall through
1562 iep = __ pc(); __ push(itos); // fall through
1563 vep = __ pc(); __ bind(L); // fall through
1564 generate_and_dispatch(t);
1565 }
1566
1567 //------------------------------------------------------------------------------------------------------------------------
1568
1569 // Non-product code
1570 #ifndef PRODUCT
1571 address TemplateInterpreterGenerator::generate_trace_code(TosState state) {
1572 address entry = __ pc();
1573
1574 // prepare expression stack
1575 __ push(state); // save tosca
1576
1577 // pass tosca registers as arguments
1578 __ mov(R2, R0_tos);
1579 __ mov(R3, R1_tos_hi);
1580 __ mov(R1, LR); // save return address
1581
1582 // call tracer
1583 __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::trace_bytecode), R1, R2, R3);
1584
1585 __ mov(LR, R0); // restore return address
1586 __ pop(state); // restore tosca
1587
1588 // return
1589 __ ret();
1590
1591 return entry;
1592 }
1593
1594
1595 void TemplateInterpreterGenerator::count_bytecode() {
1596 __ inc_global_counter((address) &BytecodeCounter::_counter_value, 0, Rtemp, R2_tmp, true);
1597 }
1598
1599
1600 void TemplateInterpreterGenerator::histogram_bytecode(Template* t) {
1601 __ inc_global_counter((address)&BytecodeHistogram::_counters[0], sizeof(BytecodeHistogram::_counters[0]) * t->bytecode(), Rtemp, R2_tmp, true);
1602 }
1603
1604
1605 void TemplateInterpreterGenerator::histogram_bytecode_pair(Template* t) {
1606 const Register Rindex_addr = R2_tmp;
1607 Label Lcontinue;
1608 InlinedAddress Lcounters((address)BytecodePairHistogram::_counters);
1609 InlinedAddress Lindex((address)&BytecodePairHistogram::_index);
1610 const Register Rcounters_addr = R2_tmp;
1611 const Register Rindex = R4_tmp;
1612
1613 // calculate new index for counter:
1614 // index = (_index >> log2_number_of_codes) | (bytecode << log2_number_of_codes).
1615 // (_index >> log2_number_of_codes) is previous bytecode
1616
1617 __ ldr_literal(Rindex_addr, Lindex);
1618 __ ldr_s32(Rindex, Address(Rindex_addr));
1619 __ mov_slow(Rtemp, ((int)t->bytecode()) << BytecodePairHistogram::log2_number_of_codes);
1620 __ orr(Rindex, Rtemp, AsmOperand(Rindex, lsr, BytecodePairHistogram::log2_number_of_codes));
1621 __ str_32(Rindex, Address(Rindex_addr));
1622
1623 // Rindex (R4) contains index of counter
1624
1625 __ ldr_literal(Rcounters_addr, Lcounters);
1626 __ ldr_s32(Rtemp, Address::indexed_32(Rcounters_addr, Rindex));
1627 __ adds_32(Rtemp, Rtemp, 1);
1628 __ b(Lcontinue, mi); // avoid overflow
1629 __ str_32(Rtemp, Address::indexed_32(Rcounters_addr, Rindex));
1630
1631 __ b(Lcontinue);
1632
1633 __ bind_literal(Lindex);
1634 __ bind_literal(Lcounters);
1635
1636 __ bind(Lcontinue);
1637 }
1638
1639
1640 void TemplateInterpreterGenerator::trace_bytecode(Template* t) {
1641 // Call a little run-time stub to avoid blow-up for each bytecode.
1642 // The run-time runtime saves the right registers, depending on
1643 // the tosca in-state for the given template.
1644 assert(Interpreter::trace_code(t->tos_in()) != nullptr,
1645 "entry must have been generated");
1646 address trace_entry = Interpreter::trace_code(t->tos_in());
1647 __ call(trace_entry, relocInfo::none);
1648 }
1649
1650
1651 void TemplateInterpreterGenerator::stop_interpreter_at() {
1652 Label Lcontinue;
1653 const Register stop_at = R2_tmp;
1654
1655 __ ldr_global_s32(Rtemp, (address) &BytecodeCounter::_counter_value);
1656 __ mov_slow(stop_at, StopInterpreterAt);
1657
1658 // test bytecode counter
1659 __ cmp(Rtemp, stop_at);
1660 __ b(Lcontinue, ne);
1661
1662 __ trace_state("stop_interpreter_at");
1663 __ breakpoint();
1664
1665 __ bind(Lcontinue);
1666 }
1667 #endif // !PRODUCT