1 /*
2 * Copyright (c) 2003, 2025, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2014, 2021, Red Hat Inc. All rights reserved.
4 * Copyright (c) 2021, Azul Systems, Inc. All rights reserved.
5 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 *
7 * This code is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU General Public License version 2 only, as
9 * published by the Free Software Foundation.
10 *
11 * This code is distributed in the hope that it will be useful, but WITHOUT
12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * version 2 for more details (a copy is included in the LICENSE file that
15 * accompanied this code).
16 *
17 * You should have received a copy of the GNU General Public License version
18 * 2 along with this work; if not, write to the Free Software Foundation,
19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20 *
21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22 * or visit www.oracle.com if you need additional information or have any
23 * questions.
24 *
25 */
26
27 #include "asm/macroAssembler.hpp"
28 #include "asm/macroAssembler.inline.hpp"
29 #include "classfile/symbolTable.hpp"
30 #include "code/codeCache.hpp"
31 #include "code/compiledIC.hpp"
32 #include "code/debugInfoRec.hpp"
33 #include "code/vtableStubs.hpp"
34 #include "compiler/oopMap.hpp"
35 #include "gc/shared/barrierSetAssembler.hpp"
36 #include "interpreter/interpreter.hpp"
37 #include "interpreter/interp_masm.hpp"
38 #include "logging/log.hpp"
39 #include "memory/resourceArea.hpp"
40 #include "nativeInst_aarch64.hpp"
41 #include "oops/klass.inline.hpp"
42 #include "oops/method.inline.hpp"
43 #include "prims/methodHandles.hpp"
44 #include "runtime/continuation.hpp"
45 #include "runtime/continuationEntry.inline.hpp"
46 #include "runtime/globals.hpp"
47 #include "runtime/jniHandles.hpp"
48 #include "runtime/safepointMechanism.hpp"
49 #include "runtime/sharedRuntime.hpp"
50 #include "runtime/signature.hpp"
51 #include "runtime/stubRoutines.hpp"
52 #include "runtime/timerTrace.hpp"
53 #include "runtime/vframeArray.hpp"
54 #include "utilities/align.hpp"
55 #include "utilities/formatBuffer.hpp"
56 #include "vmreg_aarch64.inline.hpp"
57 #ifdef COMPILER1
58 #include "c1/c1_Runtime1.hpp"
59 #endif
60 #ifdef COMPILER2
61 #include "adfiles/ad_aarch64.hpp"
62 #include "opto/runtime.hpp"
63 #endif
64 #if INCLUDE_JVMCI
65 #include "jvmci/jvmciJavaClasses.hpp"
66 #endif
67
68 #define __ masm->
69
70 #ifdef PRODUCT
71 #define BLOCK_COMMENT(str) /* nothing */
72 #else
73 #define BLOCK_COMMENT(str) __ block_comment(str)
74 #endif
75
76 const int StackAlignmentInSlots = StackAlignmentInBytes / VMRegImpl::stack_slot_size;
77
78 // FIXME -- this is used by C1
79 class RegisterSaver {
80 const bool _save_vectors;
81 public:
82 RegisterSaver(bool save_vectors) : _save_vectors(save_vectors) {}
83
84 OopMap* save_live_registers(MacroAssembler* masm, int additional_frame_words, int* total_frame_words);
85 void restore_live_registers(MacroAssembler* masm);
86
87 // Offsets into the register save area
88 // Used by deoptimization when it is managing result register
89 // values on its own
90
91 int reg_offset_in_bytes(Register r);
92 int r0_offset_in_bytes() { return reg_offset_in_bytes(r0); }
93 int rscratch1_offset_in_bytes() { return reg_offset_in_bytes(rscratch1); }
94 int v0_offset_in_bytes();
95
96 // Total stack size in bytes for saving sve predicate registers.
97 int total_sve_predicate_in_bytes();
98
99 // Capture info about frame layout
100 // Note this is only correct when not saving full vectors.
101 enum layout {
102 fpu_state_off = 0,
103 fpu_state_end = fpu_state_off + FPUStateSizeInWords - 1,
104 // The frame sender code expects that rfp will be in
105 // the "natural" place and will override any oopMap
106 // setting for it. We must therefore force the layout
107 // so that it agrees with the frame sender code.
108 r0_off = fpu_state_off + FPUStateSizeInWords,
109 rfp_off = r0_off + (Register::number_of_registers - 2) * Register::max_slots_per_register,
110 return_off = rfp_off + Register::max_slots_per_register, // slot for return address
111 reg_save_size = return_off + Register::max_slots_per_register};
112
113 };
114
115 int RegisterSaver::reg_offset_in_bytes(Register r) {
116 // The integer registers are located above the floating point
117 // registers in the stack frame pushed by save_live_registers() so the
118 // offset depends on whether we are saving full vectors, and whether
119 // those vectors are NEON or SVE.
120
121 int slots_per_vect = FloatRegister::save_slots_per_register;
122
123 #if COMPILER2_OR_JVMCI
124 if (_save_vectors) {
125 slots_per_vect = FloatRegister::slots_per_neon_register;
126
127 #ifdef COMPILER2
128 if (Matcher::supports_scalable_vector()) {
129 slots_per_vect = Matcher::scalable_vector_reg_size(T_FLOAT);
130 }
131 #endif
132 }
133 #endif
134
135 int r0_offset = v0_offset_in_bytes() + (slots_per_vect * FloatRegister::number_of_registers) * BytesPerInt;
136 return r0_offset + r->encoding() * wordSize;
137 }
138
139 int RegisterSaver::v0_offset_in_bytes() {
140 // The floating point registers are located above the predicate registers if
141 // they are present in the stack frame pushed by save_live_registers(). So the
142 // offset depends on the saved total predicate vectors in the stack frame.
143 return (total_sve_predicate_in_bytes() / VMRegImpl::stack_slot_size) * BytesPerInt;
144 }
145
146 int RegisterSaver::total_sve_predicate_in_bytes() {
147 #ifdef COMPILER2
148 if (_save_vectors && Matcher::supports_scalable_vector()) {
149 return (Matcher::scalable_vector_reg_size(T_BYTE) >> LogBitsPerByte) *
150 PRegister::number_of_registers;
151 }
152 #endif
153 return 0;
154 }
155
156 OopMap* RegisterSaver::save_live_registers(MacroAssembler* masm, int additional_frame_words, int* total_frame_words) {
157 bool use_sve = false;
158 int sve_vector_size_in_bytes = 0;
159 int sve_vector_size_in_slots = 0;
160 int sve_predicate_size_in_slots = 0;
161 int total_predicate_in_bytes = total_sve_predicate_in_bytes();
162 int total_predicate_in_slots = total_predicate_in_bytes / VMRegImpl::stack_slot_size;
163
164 #ifdef COMPILER2
165 use_sve = Matcher::supports_scalable_vector();
166 if (use_sve) {
167 sve_vector_size_in_bytes = Matcher::scalable_vector_reg_size(T_BYTE);
168 sve_vector_size_in_slots = Matcher::scalable_vector_reg_size(T_FLOAT);
169 sve_predicate_size_in_slots = Matcher::scalable_predicate_reg_slots();
170 }
171 #endif
172
173 #if COMPILER2_OR_JVMCI
174 if (_save_vectors) {
175 int extra_save_slots_per_register = 0;
176 // Save upper half of vector registers
177 if (use_sve) {
178 extra_save_slots_per_register = sve_vector_size_in_slots - FloatRegister::save_slots_per_register;
179 } else {
180 extra_save_slots_per_register = FloatRegister::extra_save_slots_per_neon_register;
181 }
182 int extra_vector_bytes = extra_save_slots_per_register *
183 VMRegImpl::stack_slot_size *
184 FloatRegister::number_of_registers;
185 additional_frame_words += ((extra_vector_bytes + total_predicate_in_bytes) / wordSize);
186 }
187 #else
188 assert(!_save_vectors, "vectors are generated only by C2 and JVMCI");
189 #endif
190
191 int frame_size_in_bytes = align_up(additional_frame_words * wordSize +
192 reg_save_size * BytesPerInt, 16);
193 // OopMap frame size is in compiler stack slots (jint's) not bytes or words
194 int frame_size_in_slots = frame_size_in_bytes / BytesPerInt;
195 // The caller will allocate additional_frame_words
196 int additional_frame_slots = additional_frame_words * wordSize / BytesPerInt;
197 // CodeBlob frame size is in words.
198 int frame_size_in_words = frame_size_in_bytes / wordSize;
199 *total_frame_words = frame_size_in_words;
200
201 // Save Integer and Float registers.
202 __ enter();
203 __ push_CPU_state(_save_vectors, use_sve, sve_vector_size_in_bytes, total_predicate_in_bytes);
204
205 // Set an oopmap for the call site. This oopmap will map all
206 // oop-registers and debug-info registers as callee-saved. This
207 // will allow deoptimization at this safepoint to find all possible
208 // debug-info recordings, as well as let GC find all oops.
209
210 OopMapSet *oop_maps = new OopMapSet();
211 OopMap* oop_map = new OopMap(frame_size_in_slots, 0);
212
213 for (int i = 0; i < Register::number_of_registers; i++) {
214 Register r = as_Register(i);
215 if (i <= rfp->encoding() && r != rscratch1 && r != rscratch2) {
216 // SP offsets are in 4-byte words.
217 // Register slots are 8 bytes wide, 32 floating-point registers.
218 int sp_offset = Register::max_slots_per_register * i +
219 FloatRegister::save_slots_per_register * FloatRegister::number_of_registers;
220 oop_map->set_callee_saved(VMRegImpl::stack2reg(sp_offset + additional_frame_slots), r->as_VMReg());
221 }
222 }
223
224 for (int i = 0; i < FloatRegister::number_of_registers; i++) {
225 FloatRegister r = as_FloatRegister(i);
226 int sp_offset = 0;
227 if (_save_vectors) {
228 sp_offset = use_sve ? (total_predicate_in_slots + sve_vector_size_in_slots * i) :
229 (FloatRegister::slots_per_neon_register * i);
230 } else {
231 sp_offset = FloatRegister::save_slots_per_register * i;
232 }
233 oop_map->set_callee_saved(VMRegImpl::stack2reg(sp_offset), r->as_VMReg());
234 }
235
236 return oop_map;
237 }
238
239 void RegisterSaver::restore_live_registers(MacroAssembler* masm) {
240 #ifdef COMPILER2
241 __ pop_CPU_state(_save_vectors, Matcher::supports_scalable_vector(),
242 Matcher::scalable_vector_reg_size(T_BYTE), total_sve_predicate_in_bytes());
243 #else
244 #if !INCLUDE_JVMCI
245 assert(!_save_vectors, "vectors are generated only by C2 and JVMCI");
246 #endif
247 __ pop_CPU_state(_save_vectors);
248 #endif
249 __ ldp(rfp, lr, Address(__ post(sp, 2 * wordSize)));
250 __ authenticate_return_address();
251 }
252
253 // Is vector's size (in bytes) bigger than a size saved by default?
254 // 8 bytes vector registers are saved by default on AArch64.
255 // The SVE supported min vector size is 8 bytes and we need to save
256 // predicate registers when the vector size is 8 bytes as well.
257 bool SharedRuntime::is_wide_vector(int size) {
258 return size > 8 || (UseSVE > 0 && size >= 8);
259 }
260
261 // ---------------------------------------------------------------------------
262 // Read the array of BasicTypes from a signature, and compute where the
263 // arguments should go. Values in the VMRegPair regs array refer to 4-byte
264 // quantities. Values less than VMRegImpl::stack0 are registers, those above
265 // refer to 4-byte stack slots. All stack slots are based off of the stack pointer
266 // as framesizes are fixed.
267 // VMRegImpl::stack0 refers to the first slot 0(sp).
268 // and VMRegImpl::stack0+1 refers to the memory word 4-byes higher.
269 // Register up to Register::number_of_registers are the 64-bit
270 // integer registers.
271
272 // Note: the INPUTS in sig_bt are in units of Java argument words,
273 // which are 64-bit. The OUTPUTS are in 32-bit units.
274
275 // The Java calling convention is a "shifted" version of the C ABI.
276 // By skipping the first C ABI register we can call non-static jni
277 // methods with small numbers of arguments without having to shuffle
278 // the arguments at all. Since we control the java ABI we ought to at
279 // least get some advantage out of it.
280
281 int SharedRuntime::java_calling_convention(const BasicType *sig_bt,
282 VMRegPair *regs,
283 int total_args_passed) {
284
285 // Create the mapping between argument positions and
286 // registers.
287 static const Register INT_ArgReg[Argument::n_int_register_parameters_j] = {
288 j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5, j_rarg6, j_rarg7
289 };
290 static const FloatRegister FP_ArgReg[Argument::n_float_register_parameters_j] = {
291 j_farg0, j_farg1, j_farg2, j_farg3,
292 j_farg4, j_farg5, j_farg6, j_farg7
293 };
294
295
296 uint int_args = 0;
297 uint fp_args = 0;
298 uint stk_args = 0;
299
300 for (int i = 0; i < total_args_passed; i++) {
301 switch (sig_bt[i]) {
302 case T_BOOLEAN:
303 case T_CHAR:
304 case T_BYTE:
305 case T_SHORT:
306 case T_INT:
307 if (int_args < Argument::n_int_register_parameters_j) {
308 regs[i].set1(INT_ArgReg[int_args++]->as_VMReg());
309 } else {
310 stk_args = align_up(stk_args, 2);
311 regs[i].set1(VMRegImpl::stack2reg(stk_args));
312 stk_args += 1;
313 }
314 break;
315 case T_VOID:
316 // halves of T_LONG or T_DOUBLE
317 assert(i != 0 && (sig_bt[i - 1] == T_LONG || sig_bt[i - 1] == T_DOUBLE), "expecting half");
318 regs[i].set_bad();
319 break;
320 case T_LONG:
321 assert((i + 1) < total_args_passed && sig_bt[i + 1] == T_VOID, "expecting half");
322 // fall through
323 case T_OBJECT:
324 case T_ARRAY:
325 case T_ADDRESS:
326 if (int_args < Argument::n_int_register_parameters_j) {
327 regs[i].set2(INT_ArgReg[int_args++]->as_VMReg());
328 } else {
329 stk_args = align_up(stk_args, 2);
330 regs[i].set2(VMRegImpl::stack2reg(stk_args));
331 stk_args += 2;
332 }
333 break;
334 case T_FLOAT:
335 if (fp_args < Argument::n_float_register_parameters_j) {
336 regs[i].set1(FP_ArgReg[fp_args++]->as_VMReg());
337 } else {
338 stk_args = align_up(stk_args, 2);
339 regs[i].set1(VMRegImpl::stack2reg(stk_args));
340 stk_args += 1;
341 }
342 break;
343 case T_DOUBLE:
344 assert((i + 1) < total_args_passed && sig_bt[i + 1] == T_VOID, "expecting half");
345 if (fp_args < Argument::n_float_register_parameters_j) {
346 regs[i].set2(FP_ArgReg[fp_args++]->as_VMReg());
347 } else {
348 stk_args = align_up(stk_args, 2);
349 regs[i].set2(VMRegImpl::stack2reg(stk_args));
350 stk_args += 2;
351 }
352 break;
353 default:
354 ShouldNotReachHere();
355 break;
356 }
357 }
358
359 return stk_args;
360 }
361
362
363 const uint SharedRuntime::java_return_convention_max_int = Argument::n_int_register_parameters_j;
364 const uint SharedRuntime::java_return_convention_max_float = Argument::n_float_register_parameters_j;
365
366 int SharedRuntime::java_return_convention(const BasicType *sig_bt, VMRegPair *regs, int total_args_passed) {
367
368 // Create the mapping between argument positions and registers.
369
370 static const Register INT_ArgReg[java_return_convention_max_int] = {
371 r0 /* j_rarg7 */, j_rarg6, j_rarg5, j_rarg4, j_rarg3, j_rarg2, j_rarg1, j_rarg0
372 };
373
374 static const FloatRegister FP_ArgReg[java_return_convention_max_float] = {
375 j_farg0, j_farg1, j_farg2, j_farg3, j_farg4, j_farg5, j_farg6, j_farg7
376 };
377
378 uint int_args = 0;
379 uint fp_args = 0;
380
381 for (int i = 0; i < total_args_passed; i++) {
382 switch (sig_bt[i]) {
383 case T_BOOLEAN:
384 case T_CHAR:
385 case T_BYTE:
386 case T_SHORT:
387 case T_INT:
388 if (int_args < SharedRuntime::java_return_convention_max_int) {
389 regs[i].set1(INT_ArgReg[int_args]->as_VMReg());
390 int_args ++;
391 } else {
392 return -1;
393 }
394 break;
395 case T_VOID:
396 // halves of T_LONG or T_DOUBLE
397 assert(i != 0 && (sig_bt[i - 1] == T_LONG || sig_bt[i - 1] == T_DOUBLE), "expecting half");
398 regs[i].set_bad();
399 break;
400 case T_LONG:
401 assert((i + 1) < total_args_passed && sig_bt[i + 1] == T_VOID, "expecting half");
402 // fall through
403 case T_OBJECT:
404 case T_ARRAY:
405 case T_ADDRESS:
406 // Should T_METADATA be added to java_calling_convention as well ?
407 case T_METADATA:
408 if (int_args < SharedRuntime::java_return_convention_max_int) {
409 regs[i].set2(INT_ArgReg[int_args]->as_VMReg());
410 int_args ++;
411 } else {
412 return -1;
413 }
414 break;
415 case T_FLOAT:
416 if (fp_args < SharedRuntime::java_return_convention_max_float) {
417 regs[i].set1(FP_ArgReg[fp_args]->as_VMReg());
418 fp_args ++;
419 } else {
420 return -1;
421 }
422 break;
423 case T_DOUBLE:
424 assert((i + 1) < total_args_passed && sig_bt[i + 1] == T_VOID, "expecting half");
425 if (fp_args < SharedRuntime::java_return_convention_max_float) {
426 regs[i].set2(FP_ArgReg[fp_args]->as_VMReg());
427 fp_args ++;
428 } else {
429 return -1;
430 }
431 break;
432 default:
433 ShouldNotReachHere();
434 break;
435 }
436 }
437
438 return int_args + fp_args;
439 }
440
441 // Patch the callers callsite with entry to compiled code if it exists.
442 static void patch_callers_callsite(MacroAssembler *masm) {
443 Label L;
444 __ ldr(rscratch1, Address(rmethod, in_bytes(Method::code_offset())));
445 __ cbz(rscratch1, L);
446
447 __ enter();
448 __ push_CPU_state();
449
450 // VM needs caller's callsite
451 // VM needs target method
452 // This needs to be a long call since we will relocate this adapter to
453 // the codeBuffer and it may not reach
454
455 #ifndef PRODUCT
456 assert(frame::arg_reg_save_area_bytes == 0, "not expecting frame reg save area");
457 #endif
458
459 __ mov(c_rarg0, rmethod);
460 __ mov(c_rarg1, lr);
461 __ authenticate_return_address(c_rarg1);
462 __ lea(rscratch1, RuntimeAddress(CAST_FROM_FN_PTR(address, SharedRuntime::fixup_callers_callsite)));
463 __ blr(rscratch1);
464
465 // Explicit isb required because fixup_callers_callsite may change the code
466 // stream.
467 __ safepoint_isb();
468
469 __ pop_CPU_state();
470 // restore sp
471 __ leave();
472 __ bind(L);
473 }
474
475 // For each inline type argument, sig includes the list of fields of
476 // the inline type. This utility function computes the number of
477 // arguments for the call if inline types are passed by reference (the
478 // calling convention the interpreter expects).
479 static int compute_total_args_passed_int(const GrowableArray<SigEntry>* sig_extended) {
480 int total_args_passed = 0;
481 if (InlineTypePassFieldsAsArgs) {
482 for (int i = 0; i < sig_extended->length(); i++) {
483 BasicType bt = sig_extended->at(i)._bt;
484 if (bt == T_METADATA) {
485 // In sig_extended, an inline type argument starts with:
486 // T_METADATA, followed by the types of the fields of the
487 // inline type and T_VOID to mark the end of the value
488 // type. Inline types are flattened so, for instance, in the
489 // case of an inline type with an int field and an inline type
490 // field that itself has 2 fields, an int and a long:
491 // T_METADATA T_INT T_METADATA T_INT T_LONG T_VOID (second
492 // slot for the T_LONG) T_VOID (inner inline type) T_VOID
493 // (outer inline type)
494 total_args_passed++;
495 int vt = 1;
496 do {
497 i++;
498 BasicType bt = sig_extended->at(i)._bt;
499 BasicType prev_bt = sig_extended->at(i-1)._bt;
500 if (bt == T_METADATA) {
501 vt++;
502 } else if (bt == T_VOID &&
503 prev_bt != T_LONG &&
504 prev_bt != T_DOUBLE) {
505 vt--;
506 }
507 } while (vt != 0);
508 } else {
509 total_args_passed++;
510 }
511 }
512 } else {
513 total_args_passed = sig_extended->length();
514 }
515
516 return total_args_passed;
517 }
518
519
520 static void gen_c2i_adapter_helper(MacroAssembler* masm,
521 BasicType bt,
522 BasicType prev_bt,
523 size_t size_in_bytes,
524 const VMRegPair& reg_pair,
525 const Address& to,
526 Register tmp1,
527 Register tmp2,
528 Register tmp3,
529 int extraspace,
530 bool is_oop) {
531 if (bt == T_VOID) {
532 assert(prev_bt == T_LONG || prev_bt == T_DOUBLE, "missing half");
533 return;
534 }
535
536 // Say 4 args:
537 // i st_off
538 // 0 32 T_LONG
539 // 1 24 T_VOID
540 // 2 16 T_OBJECT
541 // 3 8 T_BOOL
542 // - 0 return address
543 //
544 // However to make thing extra confusing. Because we can fit a Java long/double in
545 // a single slot on a 64 bt vm and it would be silly to break them up, the interpreter
546 // leaves one slot empty and only stores to a single slot. In this case the
547 // slot that is occupied is the T_VOID slot. See I said it was confusing.
548
549 bool wide = (size_in_bytes == wordSize);
550 VMReg r_1 = reg_pair.first();
551 VMReg r_2 = reg_pair.second();
552 assert(r_2->is_valid() == wide, "invalid size");
553 if (!r_1->is_valid()) {
554 assert(!r_2->is_valid(), "");
555 return;
556 }
557
558 if (!r_1->is_FloatRegister()) {
559 Register val = r25;
560 if (r_1->is_stack()) {
561 // memory to memory use r25 (scratch registers is used by store_heap_oop)
562 int ld_off = r_1->reg2stack() * VMRegImpl::stack_slot_size + extraspace;
563 __ load_sized_value(val, Address(sp, ld_off), size_in_bytes, /* is_signed */ false);
564 } else {
565 val = r_1->as_Register();
566 }
567 assert_different_registers(to.base(), val, tmp1, tmp2, tmp3);
568 if (is_oop) {
569 __ store_heap_oop(to, val, tmp1, tmp2, tmp3, IN_HEAP | ACCESS_WRITE | IS_DEST_UNINITIALIZED);
570 } else {
571 __ store_sized_value(to, val, size_in_bytes);
572 }
573 } else {
574 if (wide) {
575 __ strd(r_1->as_FloatRegister(), to);
576 } else {
577 // only a float use just part of the slot
578 __ strs(r_1->as_FloatRegister(), to);
579 }
580 }
581 }
582
583 static void gen_c2i_adapter(MacroAssembler *masm,
584 const GrowableArray<SigEntry>* sig_extended,
585 const VMRegPair *regs,
586 bool requires_clinit_barrier,
587 address& c2i_no_clinit_check_entry,
588 Label& skip_fixup,
589 address start,
590 OopMapSet* oop_maps,
591 int& frame_complete,
592 int& frame_size_in_words,
593 bool alloc_inline_receiver) {
594 if (requires_clinit_barrier && VM_Version::supports_fast_class_init_checks()) {
595 Label L_skip_barrier;
596
597 { // Bypass the barrier for non-static methods
598 __ ldrh(rscratch1, Address(rmethod, Method::access_flags_offset()));
599 __ andsw(zr, rscratch1, JVM_ACC_STATIC);
600 __ br(Assembler::EQ, L_skip_barrier); // non-static
601 }
602
603 __ load_method_holder(rscratch2, rmethod);
604 __ clinit_barrier(rscratch2, rscratch1, &L_skip_barrier);
605 __ far_jump(RuntimeAddress(SharedRuntime::get_handle_wrong_method_stub()));
606
607 __ bind(L_skip_barrier);
608 c2i_no_clinit_check_entry = __ pc();
609 }
610
611 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
612 bs->c2i_entry_barrier(masm);
613
614 // Before we get into the guts of the C2I adapter, see if we should be here
615 // at all. We've come from compiled code and are attempting to jump to the
616 // interpreter, which means the caller made a static call to get here
617 // (vcalls always get a compiled target if there is one). Check for a
618 // compiled target. If there is one, we need to patch the caller's call.
619 patch_callers_callsite(masm);
620
621 __ bind(skip_fixup);
622
623 // Name some registers to be used in the following code. We can use
624 // anything except r0-r7 which are arguments in the Java calling
625 // convention, rmethod (r12), and r13 which holds the outgoing sender
626 // SP for the interpreter.
627 Register buf_array = r10; // Array of buffered inline types
628 Register buf_oop = r11; // Buffered inline type oop
629 Register tmp1 = r15;
630 Register tmp2 = r16;
631 Register tmp3 = r17;
632
633 if (InlineTypePassFieldsAsArgs) {
634 // Is there an inline type argument?
635 bool has_inline_argument = false;
636 for (int i = 0; i < sig_extended->length() && !has_inline_argument; i++) {
637 has_inline_argument = (sig_extended->at(i)._bt == T_METADATA);
638 }
639 if (has_inline_argument) {
640 // There is at least an inline type argument: we're coming from
641 // compiled code so we have no buffers to back the inline types
642 // Allocate the buffers here with a runtime call.
643 RegisterSaver reg_save(false /* save_vectors */);
644 OopMap* map = reg_save.save_live_registers(masm, 0, &frame_size_in_words);
645
646 frame_complete = __ offset();
647 address the_pc = __ pc();
648
649 Label retaddr;
650 __ set_last_Java_frame(sp, noreg, retaddr, rscratch1);
651
652 __ mov(c_rarg0, rthread);
653 __ mov(c_rarg1, rmethod);
654 __ mov(c_rarg2, (int64_t)alloc_inline_receiver);
655
656 __ lea(rscratch1, RuntimeAddress(CAST_FROM_FN_PTR(address, SharedRuntime::allocate_inline_types)));
657 __ blr(rscratch1);
658 __ bind(retaddr);
659
660 oop_maps->add_gc_map(__ pc() - start, map);
661 __ reset_last_Java_frame(false);
662
663 reg_save.restore_live_registers(masm);
664
665 Label no_exception;
666 __ ldr(rscratch1, Address(rthread, Thread::pending_exception_offset()));
667 __ cbz(rscratch1, no_exception);
668
669 __ str(zr, Address(rthread, JavaThread::vm_result_offset()));
670 __ ldr(r0, Address(rthread, Thread::pending_exception_offset()));
671 __ b(RuntimeAddress(StubRoutines::forward_exception_entry()));
672
673 __ bind(no_exception);
674
675 // We get an array of objects from the runtime call
676 __ get_vm_result(buf_array, rthread);
677 __ get_vm_result_2(rmethod, rthread); // TODO: required to keep the callee Method live?
678 }
679 }
680
681 // Since all args are passed on the stack, total_args_passed *
682 // Interpreter::stackElementSize is the space we need.
683
684 int total_args_passed = compute_total_args_passed_int(sig_extended);
685 int extraspace = total_args_passed * Interpreter::stackElementSize;
686
687 // stack is aligned, keep it that way
688 extraspace = align_up(extraspace, StackAlignmentInBytes);
689
690 // set senderSP value
691 __ mov(r19_sender_sp, sp);
692
693 __ sub(sp, sp, extraspace);
694
695 // Now write the args into the outgoing interpreter space
696
697 // next_arg_comp is the next argument from the compiler point of
698 // view (inline type fields are passed in registers/on the stack). In
699 // sig_extended, an inline type argument starts with: T_METADATA,
700 // followed by the types of the fields of the inline type and T_VOID
701 // to mark the end of the inline type. ignored counts the number of
702 // T_METADATA/T_VOID. next_vt_arg is the next inline type argument:
703 // used to get the buffer for that argument from the pool of buffers
704 // we allocated above and want to pass to the
705 // interpreter. next_arg_int is the next argument from the
706 // interpreter point of view (inline types are passed by reference).
707 for (int next_arg_comp = 0, ignored = 0, next_vt_arg = 0, next_arg_int = 0;
708 next_arg_comp < sig_extended->length(); next_arg_comp++) {
709 assert(ignored <= next_arg_comp, "shouldn't skip over more slots than there are arguments");
710 assert(next_arg_int <= total_args_passed, "more arguments for the interpreter than expected?");
711 BasicType bt = sig_extended->at(next_arg_comp)._bt;
712 int st_off = (total_args_passed - next_arg_int - 1) * Interpreter::stackElementSize;
713 if (!InlineTypePassFieldsAsArgs || bt != T_METADATA) {
714 int next_off = st_off - Interpreter::stackElementSize;
715 const int offset = (bt == T_LONG || bt == T_DOUBLE) ? next_off : st_off;
716 const VMRegPair reg_pair = regs[next_arg_comp-ignored];
717 size_t size_in_bytes = reg_pair.second()->is_valid() ? 8 : 4;
718 gen_c2i_adapter_helper(masm, bt, next_arg_comp > 0 ? sig_extended->at(next_arg_comp-1)._bt : T_ILLEGAL,
719 size_in_bytes, reg_pair, Address(sp, offset), tmp1, tmp2, tmp3, extraspace, false);
720 next_arg_int++;
721 #ifdef ASSERT
722 if (bt == T_LONG || bt == T_DOUBLE) {
723 // Overwrite the unused slot with known junk
724 __ mov(rscratch1, CONST64(0xdeadffffdeadaaaa));
725 __ str(rscratch1, Address(sp, st_off));
726 }
727 #endif /* ASSERT */
728 } else {
729 ignored++;
730 // get the buffer from the just allocated pool of buffers
731 int index = arrayOopDesc::base_offset_in_bytes(T_OBJECT) + next_vt_arg * type2aelembytes(T_OBJECT);
732 __ load_heap_oop(buf_oop, Address(buf_array, index), tmp1, tmp2);
733 next_vt_arg++; next_arg_int++;
734 int vt = 1;
735 // write fields we get from compiled code in registers/stack
736 // slots to the buffer: we know we are done with that inline type
737 // argument when we hit the T_VOID that acts as an end of inline
738 // type delimiter for this inline type. Inline types are flattened
739 // so we might encounter embedded inline types. Each entry in
740 // sig_extended contains a field offset in the buffer.
741 Label L_null;
742 do {
743 next_arg_comp++;
744 BasicType bt = sig_extended->at(next_arg_comp)._bt;
745 BasicType prev_bt = sig_extended->at(next_arg_comp - 1)._bt;
746 if (bt == T_METADATA) {
747 vt++;
748 ignored++;
749 } else if (bt == T_VOID && prev_bt != T_LONG && prev_bt != T_DOUBLE) {
750 vt--;
751 ignored++;
752 } else {
753 int off = sig_extended->at(next_arg_comp)._offset;
754 if (off == -1) {
755 // Nullable inline type argument, emit null check
756 VMReg reg = regs[next_arg_comp-ignored].first();
757 Label L_notNull;
758 if (reg->is_stack()) {
759 int ld_off = reg->reg2stack() * VMRegImpl::stack_slot_size + extraspace;
760 __ ldrb(tmp1, Address(sp, ld_off));
761 __ cbnz(tmp1, L_notNull);
762 } else {
763 __ cbnz(reg->as_Register(), L_notNull);
764 }
765 __ str(zr, Address(sp, st_off));
766 __ b(L_null);
767 __ bind(L_notNull);
768 continue;
769 }
770 assert(off > 0, "offset in object should be positive");
771 size_t size_in_bytes = is_java_primitive(bt) ? type2aelembytes(bt) : wordSize;
772 bool is_oop = is_reference_type(bt);
773 gen_c2i_adapter_helper(masm, bt, next_arg_comp > 0 ? sig_extended->at(next_arg_comp-1)._bt : T_ILLEGAL,
774 size_in_bytes, regs[next_arg_comp-ignored], Address(buf_oop, off), tmp1, tmp2, tmp3, extraspace, is_oop);
775 }
776 } while (vt != 0);
777 // pass the buffer to the interpreter
778 __ str(buf_oop, Address(sp, st_off));
779 __ bind(L_null);
780 }
781 }
782
783 __ mov(esp, sp); // Interp expects args on caller's expression stack
784
785 __ ldr(rscratch1, Address(rmethod, in_bytes(Method::interpreter_entry_offset())));
786 __ br(rscratch1);
787 }
788
789 void SharedRuntime::gen_i2c_adapter(MacroAssembler *masm, int comp_args_on_stack, const GrowableArray<SigEntry>* sig, const VMRegPair *regs) {
790
791
792 // Note: r19_sender_sp contains the senderSP on entry. We must
793 // preserve it since we may do a i2c -> c2i transition if we lose a
794 // race where compiled code goes non-entrant while we get args
795 // ready.
796
797 // Adapters are frameless.
798
799 // An i2c adapter is frameless because the *caller* frame, which is
800 // interpreted, routinely repairs its own esp (from
801 // interpreter_frame_last_sp), even if a callee has modified the
802 // stack pointer. It also recalculates and aligns sp.
803
804 // A c2i adapter is frameless because the *callee* frame, which is
805 // interpreted, routinely repairs its caller's sp (from sender_sp,
806 // which is set up via the senderSP register).
807
808 // In other words, if *either* the caller or callee is interpreted, we can
809 // get the stack pointer repaired after a call.
810
811 // This is why c2i and i2c adapters cannot be indefinitely composed.
812 // In particular, if a c2i adapter were to somehow call an i2c adapter,
813 // both caller and callee would be compiled methods, and neither would
814 // clean up the stack pointer changes performed by the two adapters.
815 // If this happens, control eventually transfers back to the compiled
816 // caller, but with an uncorrected stack, causing delayed havoc.
817
818 if (VerifyAdapterCalls &&
819 (Interpreter::code() != nullptr || StubRoutines::final_stubs_code() != nullptr)) {
820 #if 0
821 // So, let's test for cascading c2i/i2c adapters right now.
822 // assert(Interpreter::contains($return_addr) ||
823 // StubRoutines::contains($return_addr),
824 // "i2c adapter must return to an interpreter frame");
825 __ block_comment("verify_i2c { ");
826 Label L_ok;
827 if (Interpreter::code() != nullptr) {
828 range_check(masm, rax, r11,
829 Interpreter::code()->code_start(), Interpreter::code()->code_end(),
830 L_ok);
831 }
832 if (StubRoutines::initial_stubs_code() != nullptr) {
833 range_check(masm, rax, r11,
834 StubRoutines::initial_stubs_code()->code_begin(),
835 StubRoutines::initial_stubs_code()->code_end(),
836 L_ok);
837 }
838 if (StubRoutines::final_stubs_code() != nullptr) {
839 range_check(masm, rax, r11,
840 StubRoutines::final_stubs_code()->code_begin(),
841 StubRoutines::final_stubs_code()->code_end(),
842 L_ok);
843 }
844 const char* msg = "i2c adapter must return to an interpreter frame";
845 __ block_comment(msg);
846 __ stop(msg);
847 __ bind(L_ok);
848 __ block_comment("} verify_i2ce ");
849 #endif
850 }
851
852 // Cut-out for having no stack args.
853 int comp_words_on_stack = 0;
854 if (comp_args_on_stack) {
855 comp_words_on_stack = align_up(comp_args_on_stack * VMRegImpl::stack_slot_size, wordSize) >> LogBytesPerWord;
856 __ sub(rscratch1, sp, comp_words_on_stack * wordSize);
857 __ andr(sp, rscratch1, -16);
858 }
859
860 // Will jump to the compiled code just as if compiled code was doing it.
861 // Pre-load the register-jump target early, to schedule it better.
862 __ ldr(rscratch1, Address(rmethod, in_bytes(Method::from_compiled_inline_offset())));
863
864 #if INCLUDE_JVMCI
865 if (EnableJVMCI) {
866 // check if this call should be routed towards a specific entry point
867 __ ldr(rscratch2, Address(rthread, in_bytes(JavaThread::jvmci_alternate_call_target_offset())));
868 Label no_alternative_target;
869 __ cbz(rscratch2, no_alternative_target);
870 __ mov(rscratch1, rscratch2);
871 __ str(zr, Address(rthread, in_bytes(JavaThread::jvmci_alternate_call_target_offset())));
872 __ bind(no_alternative_target);
873 }
874 #endif // INCLUDE_JVMCI
875
876 int total_args_passed = sig->length();
877
878 // Now generate the shuffle code.
879 for (int i = 0; i < total_args_passed; i++) {
880 BasicType bt = sig->at(i)._bt;
881 if (bt == T_VOID) {
882 assert(i > 0 && (sig->at(i - 1)._bt == T_LONG || sig->at(i - 1)._bt == T_DOUBLE), "missing half");
883 continue;
884 }
885
886 // Pick up 0, 1 or 2 words from SP+offset.
887 assert(!regs[i].second()->is_valid() || regs[i].first()->next() == regs[i].second(), "scrambled load targets?");
888
889 // Load in argument order going down.
890 int ld_off = (total_args_passed - i - 1) * Interpreter::stackElementSize;
891 // Point to interpreter value (vs. tag)
892 int next_off = ld_off - Interpreter::stackElementSize;
893 //
894 //
895 //
896 VMReg r_1 = regs[i].first();
897 VMReg r_2 = regs[i].second();
898 if (!r_1->is_valid()) {
899 assert(!r_2->is_valid(), "");
900 continue;
901 }
902 if (r_1->is_stack()) {
903 // Convert stack slot to an SP offset (+ wordSize to account for return address )
904 int st_off = regs[i].first()->reg2stack() * VMRegImpl::stack_slot_size;
905 if (!r_2->is_valid()) {
906 // sign extend???
907 __ ldrsw(rscratch2, Address(esp, ld_off));
908 __ str(rscratch2, Address(sp, st_off));
909 } else {
910 //
911 // We are using two optoregs. This can be either T_OBJECT,
912 // T_ADDRESS, T_LONG, or T_DOUBLE the interpreter allocates
913 // two slots but only uses one for thr T_LONG or T_DOUBLE case
914 // So we must adjust where to pick up the data to match the
915 // interpreter.
916 //
917 // Interpreter local[n] == MSW, local[n+1] == LSW however locals
918 // are accessed as negative so LSW is at LOW address
919
920 // ld_off is MSW so get LSW
921 const int offset = (bt == T_LONG || bt == T_DOUBLE) ? next_off : ld_off;
922 __ ldr(rscratch2, Address(esp, offset));
923 // st_off is LSW (i.e. reg.first())
924 __ str(rscratch2, Address(sp, st_off));
925 }
926 } else if (r_1->is_Register()) { // Register argument
927 Register r = r_1->as_Register();
928 if (r_2->is_valid()) {
929 //
930 // We are using two VMRegs. This can be either T_OBJECT,
931 // T_ADDRESS, T_LONG, or T_DOUBLE the interpreter allocates
932 // two slots but only uses one for thr T_LONG or T_DOUBLE case
933 // So we must adjust where to pick up the data to match the
934 // interpreter.
935
936 const int offset = (bt == T_LONG || bt == T_DOUBLE) ? next_off : ld_off;
937
938 // this can be a misaligned move
939 __ ldr(r, Address(esp, offset));
940 } else {
941 // sign extend and use a full word?
942 __ ldrw(r, Address(esp, ld_off));
943 }
944 } else {
945 if (!r_2->is_valid()) {
946 __ ldrs(r_1->as_FloatRegister(), Address(esp, ld_off));
947 } else {
948 __ ldrd(r_1->as_FloatRegister(), Address(esp, next_off));
949 }
950 }
951 }
952
953
954 __ mov(rscratch2, rscratch1);
955 __ push_cont_fastpath(rthread); // Set JavaThread::_cont_fastpath to the sp of the oldest interpreted frame we know about; kills rscratch1
956 __ mov(rscratch1, rscratch2);
957
958 // 6243940 We might end up in handle_wrong_method if
959 // the callee is deoptimized as we race thru here. If that
960 // happens we don't want to take a safepoint because the
961 // caller frame will look interpreted and arguments are now
962 // "compiled" so it is much better to make this transition
963 // invisible to the stack walking code. Unfortunately if
964 // we try and find the callee by normal means a safepoint
965 // is possible. So we stash the desired callee in the thread
966 // and the vm will find there should this case occur.
967
968 __ str(rmethod, Address(rthread, JavaThread::callee_target_offset()));
969 __ br(rscratch1);
970 }
971
972 static void gen_inline_cache_check(MacroAssembler *masm, Label& skip_fixup) {
973 Register data = rscratch2;
974 __ ic_check(1 /* end_alignment */);
975 __ ldr(rmethod, Address(data, CompiledICData::speculated_method_offset()));
976
977 // Method might have been compiled since the call site was patched to
978 // interpreted; if that is the case treat it as a miss so we can get
979 // the call site corrected.
980 __ ldr(rscratch1, Address(rmethod, in_bytes(Method::code_offset())));
981 __ cbz(rscratch1, skip_fixup);
982 __ far_jump(RuntimeAddress(SharedRuntime::get_ic_miss_stub()));
983 }
984
985 // ---------------------------------------------------------------
986 AdapterHandlerEntry* SharedRuntime::generate_i2c2i_adapters(MacroAssembler* masm,
987 int comp_args_on_stack,
988 const GrowableArray<SigEntry>* sig,
989 const VMRegPair* regs,
990 const GrowableArray<SigEntry>* sig_cc,
991 const VMRegPair* regs_cc,
992 const GrowableArray<SigEntry>* sig_cc_ro,
993 const VMRegPair* regs_cc_ro,
994 AdapterFingerPrint* fingerprint,
995 AdapterBlob*& new_adapter,
996 bool allocate_code_blob) {
997
998 address i2c_entry = __ pc();
999 gen_i2c_adapter(masm, comp_args_on_stack, sig, regs);
1000
1001 // -------------------------------------------------------------------------
1002 // Generate a C2I adapter. On entry we know rmethod holds the Method* during calls
1003 // to the interpreter. The args start out packed in the compiled layout. They
1004 // need to be unpacked into the interpreter layout. This will almost always
1005 // require some stack space. We grow the current (compiled) stack, then repack
1006 // the args. We finally end in a jump to the generic interpreter entry point.
1007 // On exit from the interpreter, the interpreter will restore our SP (lest the
1008 // compiled code, which relies solely on SP and not FP, get sick).
1009
1010 address c2i_unverified_entry = __ pc();
1011 address c2i_unverified_inline_entry = __ pc();
1012 Label skip_fixup;
1013
1014 gen_inline_cache_check(masm, skip_fixup);
1015
1016 OopMapSet* oop_maps = new OopMapSet();
1017 int frame_complete = CodeOffsets::frame_never_safe;
1018 int frame_size_in_words = 0;
1019
1020 // Scalarized c2i adapter with non-scalarized receiver (i.e., don't pack receiver)
1021 address c2i_no_clinit_check_entry = nullptr;
1022 address c2i_inline_ro_entry = __ pc();
1023 if (regs_cc != regs_cc_ro) {
1024 // No class init barrier needed because method is guaranteed to be non-static
1025 gen_c2i_adapter(masm, sig_cc_ro, regs_cc_ro, /* requires_clinit_barrier = */ false, c2i_no_clinit_check_entry,
1026 skip_fixup, i2c_entry, oop_maps, frame_complete, frame_size_in_words, /* alloc_inline_receiver = */ false);
1027 skip_fixup.reset();
1028 }
1029
1030 // Scalarized c2i adapter
1031 address c2i_entry = __ pc();
1032 address c2i_inline_entry = __ pc();
1033 gen_c2i_adapter(masm, sig_cc, regs_cc, /* requires_clinit_barrier = */ true, c2i_no_clinit_check_entry,
1034 skip_fixup, i2c_entry, oop_maps, frame_complete, frame_size_in_words, /* alloc_inline_receiver = */ true);
1035
1036 // Non-scalarized c2i adapter
1037 if (regs != regs_cc) {
1038 c2i_unverified_inline_entry = __ pc();
1039 Label inline_entry_skip_fixup;
1040 gen_inline_cache_check(masm, inline_entry_skip_fixup);
1041
1042 c2i_inline_entry = __ pc();
1043 gen_c2i_adapter(masm, sig, regs, /* requires_clinit_barrier = */ true, c2i_no_clinit_check_entry,
1044 inline_entry_skip_fixup, i2c_entry, oop_maps, frame_complete, frame_size_in_words, /* alloc_inline_receiver = */ false);
1045 }
1046
1047
1048 // The c2i adapter might safepoint and trigger a GC. The caller must make sure that
1049 // the GC knows about the location of oop argument locations passed to the c2i adapter.
1050 if (allocate_code_blob) {
1051 bool caller_must_gc_arguments = (regs != regs_cc);
1052 new_adapter = AdapterBlob::create(masm->code(), frame_complete, frame_size_in_words, oop_maps, caller_must_gc_arguments);
1053 }
1054
1055 return AdapterHandlerLibrary::new_entry(fingerprint, i2c_entry, c2i_entry, c2i_inline_entry, c2i_inline_ro_entry, c2i_unverified_entry, c2i_unverified_inline_entry, c2i_no_clinit_check_entry);
1056 }
1057
1058 static int c_calling_convention_priv(const BasicType *sig_bt,
1059 VMRegPair *regs,
1060 int total_args_passed) {
1061
1062 // We return the amount of VMRegImpl stack slots we need to reserve for all
1063 // the arguments NOT counting out_preserve_stack_slots.
1064
1065 static const Register INT_ArgReg[Argument::n_int_register_parameters_c] = {
1066 c_rarg0, c_rarg1, c_rarg2, c_rarg3, c_rarg4, c_rarg5, c_rarg6, c_rarg7
1067 };
1068 static const FloatRegister FP_ArgReg[Argument::n_float_register_parameters_c] = {
1069 c_farg0, c_farg1, c_farg2, c_farg3,
1070 c_farg4, c_farg5, c_farg6, c_farg7
1071 };
1072
1073 uint int_args = 0;
1074 uint fp_args = 0;
1075 uint stk_args = 0; // inc by 2 each time
1076
1077 for (int i = 0; i < total_args_passed; i++) {
1078 switch (sig_bt[i]) {
1079 case T_BOOLEAN:
1080 case T_CHAR:
1081 case T_BYTE:
1082 case T_SHORT:
1083 case T_INT:
1084 if (int_args < Argument::n_int_register_parameters_c) {
1085 regs[i].set1(INT_ArgReg[int_args++]->as_VMReg());
1086 } else {
1087 #ifdef __APPLE__
1088 // Less-than word types are stored one after another.
1089 // The code is unable to handle this so bailout.
1090 return -1;
1091 #endif
1092 regs[i].set1(VMRegImpl::stack2reg(stk_args));
1093 stk_args += 2;
1094 }
1095 break;
1096 case T_LONG:
1097 assert((i + 1) < total_args_passed && sig_bt[i + 1] == T_VOID, "expecting half");
1098 // fall through
1099 case T_OBJECT:
1100 case T_ARRAY:
1101 case T_ADDRESS:
1102 case T_METADATA:
1103 if (int_args < Argument::n_int_register_parameters_c) {
1104 regs[i].set2(INT_ArgReg[int_args++]->as_VMReg());
1105 } else {
1106 regs[i].set2(VMRegImpl::stack2reg(stk_args));
1107 stk_args += 2;
1108 }
1109 break;
1110 case T_FLOAT:
1111 if (fp_args < Argument::n_float_register_parameters_c) {
1112 regs[i].set1(FP_ArgReg[fp_args++]->as_VMReg());
1113 } else {
1114 #ifdef __APPLE__
1115 // Less-than word types are stored one after another.
1116 // The code is unable to handle this so bailout.
1117 return -1;
1118 #endif
1119 regs[i].set1(VMRegImpl::stack2reg(stk_args));
1120 stk_args += 2;
1121 }
1122 break;
1123 case T_DOUBLE:
1124 assert((i + 1) < total_args_passed && sig_bt[i + 1] == T_VOID, "expecting half");
1125 if (fp_args < Argument::n_float_register_parameters_c) {
1126 regs[i].set2(FP_ArgReg[fp_args++]->as_VMReg());
1127 } else {
1128 regs[i].set2(VMRegImpl::stack2reg(stk_args));
1129 stk_args += 2;
1130 }
1131 break;
1132 case T_VOID: // Halves of longs and doubles
1133 assert(i != 0 && (sig_bt[i - 1] == T_LONG || sig_bt[i - 1] == T_DOUBLE), "expecting half");
1134 regs[i].set_bad();
1135 break;
1136 default:
1137 ShouldNotReachHere();
1138 break;
1139 }
1140 }
1141
1142 return stk_args;
1143 }
1144
1145 int SharedRuntime::vector_calling_convention(VMRegPair *regs,
1146 uint num_bits,
1147 uint total_args_passed) {
1148 // More than 8 argument inputs are not supported now.
1149 assert(total_args_passed <= Argument::n_float_register_parameters_c, "unsupported");
1150 assert(num_bits >= 64 && num_bits <= 2048 && is_power_of_2(num_bits), "unsupported");
1151
1152 static const FloatRegister VEC_ArgReg[Argument::n_float_register_parameters_c] = {
1153 v0, v1, v2, v3, v4, v5, v6, v7
1154 };
1155
1156 // On SVE, we use the same vector registers with 128-bit vector registers on NEON.
1157 int next_reg_val = num_bits == 64 ? 1 : 3;
1158 for (uint i = 0; i < total_args_passed; i++) {
1159 VMReg vmreg = VEC_ArgReg[i]->as_VMReg();
1160 regs[i].set_pair(vmreg->next(next_reg_val), vmreg);
1161 }
1162 return 0;
1163 }
1164
1165 int SharedRuntime::c_calling_convention(const BasicType *sig_bt,
1166 VMRegPair *regs,
1167 int total_args_passed)
1168 {
1169 int result = c_calling_convention_priv(sig_bt, regs, total_args_passed);
1170 guarantee(result >= 0, "Unsupported arguments configuration");
1171 return result;
1172 }
1173
1174
1175 void SharedRuntime::save_native_result(MacroAssembler *masm, BasicType ret_type, int frame_slots) {
1176 // We always ignore the frame_slots arg and just use the space just below frame pointer
1177 // which by this time is free to use
1178 switch (ret_type) {
1179 case T_FLOAT:
1180 __ strs(v0, Address(rfp, -wordSize));
1181 break;
1182 case T_DOUBLE:
1183 __ strd(v0, Address(rfp, -wordSize));
1184 break;
1185 case T_VOID: break;
1186 default: {
1187 __ str(r0, Address(rfp, -wordSize));
1188 }
1189 }
1190 }
1191
1192 void SharedRuntime::restore_native_result(MacroAssembler *masm, BasicType ret_type, int frame_slots) {
1193 // We always ignore the frame_slots arg and just use the space just below frame pointer
1194 // which by this time is free to use
1195 switch (ret_type) {
1196 case T_FLOAT:
1197 __ ldrs(v0, Address(rfp, -wordSize));
1198 break;
1199 case T_DOUBLE:
1200 __ ldrd(v0, Address(rfp, -wordSize));
1201 break;
1202 case T_VOID: break;
1203 default: {
1204 __ ldr(r0, Address(rfp, -wordSize));
1205 }
1206 }
1207 }
1208 static void save_args(MacroAssembler *masm, int arg_count, int first_arg, VMRegPair *args) {
1209 RegSet x;
1210 for ( int i = first_arg ; i < arg_count ; i++ ) {
1211 if (args[i].first()->is_Register()) {
1212 x = x + args[i].first()->as_Register();
1213 } else if (args[i].first()->is_FloatRegister()) {
1214 __ strd(args[i].first()->as_FloatRegister(), Address(__ pre(sp, -2 * wordSize)));
1215 }
1216 }
1217 __ push(x, sp);
1218 }
1219
1220 static void restore_args(MacroAssembler *masm, int arg_count, int first_arg, VMRegPair *args) {
1221 RegSet x;
1222 for ( int i = first_arg ; i < arg_count ; i++ ) {
1223 if (args[i].first()->is_Register()) {
1224 x = x + args[i].first()->as_Register();
1225 } else {
1226 ;
1227 }
1228 }
1229 __ pop(x, sp);
1230 for ( int i = arg_count - 1 ; i >= first_arg ; i-- ) {
1231 if (args[i].first()->is_Register()) {
1232 ;
1233 } else if (args[i].first()->is_FloatRegister()) {
1234 __ ldrd(args[i].first()->as_FloatRegister(), Address(__ post(sp, 2 * wordSize)));
1235 }
1236 }
1237 }
1238
1239 static void verify_oop_args(MacroAssembler* masm,
1240 const methodHandle& method,
1241 const BasicType* sig_bt,
1242 const VMRegPair* regs) {
1243 Register temp_reg = r19; // not part of any compiled calling seq
1244 if (VerifyOops) {
1245 for (int i = 0; i < method->size_of_parameters(); i++) {
1246 if (sig_bt[i] == T_OBJECT ||
1247 sig_bt[i] == T_ARRAY) {
1248 VMReg r = regs[i].first();
1249 assert(r->is_valid(), "bad oop arg");
1250 if (r->is_stack()) {
1251 __ ldr(temp_reg, Address(sp, r->reg2stack() * VMRegImpl::stack_slot_size));
1252 __ verify_oop(temp_reg);
1253 } else {
1254 __ verify_oop(r->as_Register());
1255 }
1256 }
1257 }
1258 }
1259 }
1260
1261 // on exit, sp points to the ContinuationEntry
1262 static OopMap* continuation_enter_setup(MacroAssembler* masm, int& stack_slots) {
1263 assert(ContinuationEntry::size() % VMRegImpl::stack_slot_size == 0, "");
1264 assert(in_bytes(ContinuationEntry::cont_offset()) % VMRegImpl::stack_slot_size == 0, "");
1265 assert(in_bytes(ContinuationEntry::chunk_offset()) % VMRegImpl::stack_slot_size == 0, "");
1266
1267 stack_slots += (int)ContinuationEntry::size()/wordSize;
1268 __ sub(sp, sp, (int)ContinuationEntry::size()); // place Continuation metadata
1269
1270 OopMap* map = new OopMap(((int)ContinuationEntry::size() + wordSize)/ VMRegImpl::stack_slot_size, 0 /* arg_slots*/);
1271
1272 __ ldr(rscratch1, Address(rthread, JavaThread::cont_entry_offset()));
1273 __ str(rscratch1, Address(sp, ContinuationEntry::parent_offset()));
1274 __ mov(rscratch1, sp); // we can't use sp as the source in str
1275 __ str(rscratch1, Address(rthread, JavaThread::cont_entry_offset()));
1276
1277 return map;
1278 }
1279
1280 // on entry c_rarg1 points to the continuation
1281 // sp points to ContinuationEntry
1282 // c_rarg3 -- isVirtualThread
1283 static void fill_continuation_entry(MacroAssembler* masm) {
1284 #ifdef ASSERT
1285 __ movw(rscratch1, ContinuationEntry::cookie_value());
1286 __ strw(rscratch1, Address(sp, ContinuationEntry::cookie_offset()));
1287 #endif
1288
1289 __ str (c_rarg1, Address(sp, ContinuationEntry::cont_offset()));
1290 __ strw(c_rarg3, Address(sp, ContinuationEntry::flags_offset()));
1291 __ str (zr, Address(sp, ContinuationEntry::chunk_offset()));
1292 __ strw(zr, Address(sp, ContinuationEntry::argsize_offset()));
1293 __ strw(zr, Address(sp, ContinuationEntry::pin_count_offset()));
1294
1295 __ ldr(rscratch1, Address(rthread, JavaThread::cont_fastpath_offset()));
1296 __ str(rscratch1, Address(sp, ContinuationEntry::parent_cont_fastpath_offset()));
1297 __ ldr(rscratch1, Address(rthread, JavaThread::held_monitor_count_offset()));
1298 __ str(rscratch1, Address(sp, ContinuationEntry::parent_held_monitor_count_offset()));
1299
1300 __ str(zr, Address(rthread, JavaThread::cont_fastpath_offset()));
1301 __ str(zr, Address(rthread, JavaThread::held_monitor_count_offset()));
1302 }
1303
1304 // on entry, sp points to the ContinuationEntry
1305 // on exit, rfp points to the spilled rfp in the entry frame
1306 static void continuation_enter_cleanup(MacroAssembler* masm) {
1307 #ifndef PRODUCT
1308 Label OK;
1309 __ ldr(rscratch1, Address(rthread, JavaThread::cont_entry_offset()));
1310 __ cmp(sp, rscratch1);
1311 __ br(Assembler::EQ, OK);
1312 __ stop("incorrect sp1");
1313 __ bind(OK);
1314 #endif
1315 __ ldr(rscratch1, Address(sp, ContinuationEntry::parent_cont_fastpath_offset()));
1316 __ str(rscratch1, Address(rthread, JavaThread::cont_fastpath_offset()));
1317
1318 if (CheckJNICalls) {
1319 // Check if this is a virtual thread continuation
1320 Label L_skip_vthread_code;
1321 __ ldrw(rscratch1, Address(sp, ContinuationEntry::flags_offset()));
1322 __ cbzw(rscratch1, L_skip_vthread_code);
1323
1324 // If the held monitor count is > 0 and this vthread is terminating then
1325 // it failed to release a JNI monitor. So we issue the same log message
1326 // that JavaThread::exit does.
1327 __ ldr(rscratch1, Address(rthread, JavaThread::jni_monitor_count_offset()));
1328 __ cbz(rscratch1, L_skip_vthread_code);
1329
1330 // Save return value potentially containing the exception oop in callee-saved R19.
1331 __ mov(r19, r0);
1332 __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::log_jni_monitor_still_held));
1333 // Restore potential return value.
1334 __ mov(r0, r19);
1335
1336 // For vthreads we have to explicitly zero the JNI monitor count of the carrier
1337 // on termination. The held count is implicitly zeroed below when we restore from
1338 // the parent held count (which has to be zero).
1339 __ str(zr, Address(rthread, JavaThread::jni_monitor_count_offset()));
1340
1341 __ bind(L_skip_vthread_code);
1342 }
1343 #ifdef ASSERT
1344 else {
1345 // Check if this is a virtual thread continuation
1346 Label L_skip_vthread_code;
1347 __ ldrw(rscratch1, Address(sp, ContinuationEntry::flags_offset()));
1348 __ cbzw(rscratch1, L_skip_vthread_code);
1349
1350 // See comment just above. If not checking JNI calls the JNI count is only
1351 // needed for assertion checking.
1352 __ str(zr, Address(rthread, JavaThread::jni_monitor_count_offset()));
1353
1354 __ bind(L_skip_vthread_code);
1355 }
1356 #endif
1357
1358 __ ldr(rscratch1, Address(sp, ContinuationEntry::parent_held_monitor_count_offset()));
1359 __ str(rscratch1, Address(rthread, JavaThread::held_monitor_count_offset()));
1360
1361 __ ldr(rscratch2, Address(sp, ContinuationEntry::parent_offset()));
1362 __ str(rscratch2, Address(rthread, JavaThread::cont_entry_offset()));
1363 __ add(rfp, sp, (int)ContinuationEntry::size());
1364 }
1365
1366 // enterSpecial(Continuation c, boolean isContinue, boolean isVirtualThread)
1367 // On entry: c_rarg1 -- the continuation object
1368 // c_rarg2 -- isContinue
1369 // c_rarg3 -- isVirtualThread
1370 static void gen_continuation_enter(MacroAssembler* masm,
1371 const methodHandle& method,
1372 const BasicType* sig_bt,
1373 const VMRegPair* regs,
1374 int& exception_offset,
1375 OopMapSet*oop_maps,
1376 int& frame_complete,
1377 int& stack_slots,
1378 int& interpreted_entry_offset,
1379 int& compiled_entry_offset) {
1380 //verify_oop_args(masm, method, sig_bt, regs);
1381 Address resolve(SharedRuntime::get_resolve_static_call_stub(), relocInfo::static_call_type);
1382
1383 address start = __ pc();
1384
1385 Label call_thaw, exit;
1386
1387 // i2i entry used at interp_only_mode only
1388 interpreted_entry_offset = __ pc() - start;
1389 {
1390
1391 #ifdef ASSERT
1392 Label is_interp_only;
1393 __ ldrw(rscratch1, Address(rthread, JavaThread::interp_only_mode_offset()));
1394 __ cbnzw(rscratch1, is_interp_only);
1395 __ stop("enterSpecial interpreter entry called when not in interp_only_mode");
1396 __ bind(is_interp_only);
1397 #endif
1398
1399 // Read interpreter arguments into registers (this is an ad-hoc i2c adapter)
1400 __ ldr(c_rarg1, Address(esp, Interpreter::stackElementSize*2));
1401 __ ldr(c_rarg2, Address(esp, Interpreter::stackElementSize*1));
1402 __ ldr(c_rarg3, Address(esp, Interpreter::stackElementSize*0));
1403 __ push_cont_fastpath(rthread);
1404
1405 __ enter();
1406 stack_slots = 2; // will be adjusted in setup
1407 OopMap* map = continuation_enter_setup(masm, stack_slots);
1408 // The frame is complete here, but we only record it for the compiled entry, so the frame would appear unsafe,
1409 // but that's okay because at the very worst we'll miss an async sample, but we're in interp_only_mode anyway.
1410
1411 fill_continuation_entry(masm);
1412
1413 __ cbnz(c_rarg2, call_thaw);
1414
1415 const address tr_call = __ trampoline_call(resolve);
1416 if (tr_call == nullptr) {
1417 fatal("CodeCache is full at gen_continuation_enter");
1418 }
1419
1420 oop_maps->add_gc_map(__ pc() - start, map);
1421 __ post_call_nop();
1422
1423 __ b(exit);
1424
1425 address stub = CompiledDirectCall::emit_to_interp_stub(masm, tr_call);
1426 if (stub == nullptr) {
1427 fatal("CodeCache is full at gen_continuation_enter");
1428 }
1429 }
1430
1431 // compiled entry
1432 __ align(CodeEntryAlignment);
1433 compiled_entry_offset = __ pc() - start;
1434
1435 __ enter();
1436 stack_slots = 2; // will be adjusted in setup
1437 OopMap* map = continuation_enter_setup(masm, stack_slots);
1438 frame_complete = __ pc() - start;
1439
1440 fill_continuation_entry(masm);
1441
1442 __ cbnz(c_rarg2, call_thaw);
1443
1444 const address tr_call = __ trampoline_call(resolve);
1445 if (tr_call == nullptr) {
1446 fatal("CodeCache is full at gen_continuation_enter");
1447 }
1448
1449 oop_maps->add_gc_map(__ pc() - start, map);
1450 __ post_call_nop();
1451
1452 __ b(exit);
1453
1454 __ bind(call_thaw);
1455
1456 ContinuationEntry::_thaw_call_pc_offset = __ pc() - start;
1457 __ rt_call(CAST_FROM_FN_PTR(address, StubRoutines::cont_thaw()));
1458 oop_maps->add_gc_map(__ pc() - start, map->deep_copy());
1459 ContinuationEntry::_return_pc_offset = __ pc() - start;
1460 __ post_call_nop();
1461
1462 __ bind(exit);
1463 ContinuationEntry::_cleanup_offset = __ pc() - start;
1464 continuation_enter_cleanup(masm);
1465 __ leave();
1466 __ ret(lr);
1467
1468 /// exception handling
1469
1470 exception_offset = __ pc() - start;
1471 {
1472 __ mov(r19, r0); // save return value contaning the exception oop in callee-saved R19
1473
1474 continuation_enter_cleanup(masm);
1475
1476 __ ldr(c_rarg1, Address(rfp, wordSize)); // return address
1477 __ authenticate_return_address(c_rarg1);
1478 __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::exception_handler_for_return_address), rthread, c_rarg1);
1479
1480 // see OptoRuntime::generate_exception_blob: r0 -- exception oop, r3 -- exception pc
1481
1482 __ mov(r1, r0); // the exception handler
1483 __ mov(r0, r19); // restore return value contaning the exception oop
1484 __ verify_oop(r0);
1485
1486 __ leave();
1487 __ mov(r3, lr);
1488 __ br(r1); // the exception handler
1489 }
1490
1491 address stub = CompiledDirectCall::emit_to_interp_stub(masm, tr_call);
1492 if (stub == nullptr) {
1493 fatal("CodeCache is full at gen_continuation_enter");
1494 }
1495 }
1496
1497 static void gen_continuation_yield(MacroAssembler* masm,
1498 const methodHandle& method,
1499 const BasicType* sig_bt,
1500 const VMRegPair* regs,
1501 OopMapSet* oop_maps,
1502 int& frame_complete,
1503 int& stack_slots,
1504 int& compiled_entry_offset) {
1505 enum layout {
1506 rfp_off1,
1507 rfp_off2,
1508 lr_off,
1509 lr_off2,
1510 framesize // inclusive of return address
1511 };
1512 // assert(is_even(framesize/2), "sp not 16-byte aligned");
1513 stack_slots = framesize / VMRegImpl::slots_per_word;
1514 assert(stack_slots == 2, "recheck layout");
1515
1516 address start = __ pc();
1517
1518 compiled_entry_offset = __ pc() - start;
1519 __ enter();
1520
1521 __ mov(c_rarg1, sp);
1522
1523 frame_complete = __ pc() - start;
1524 address the_pc = __ pc();
1525
1526 __ post_call_nop(); // this must be exactly after the pc value that is pushed into the frame info, we use this nop for fast CodeBlob lookup
1527
1528 __ mov(c_rarg0, rthread);
1529 __ set_last_Java_frame(sp, rfp, the_pc, rscratch1);
1530 __ call_VM_leaf(Continuation::freeze_entry(), 2);
1531 __ reset_last_Java_frame(true);
1532
1533 Label pinned;
1534
1535 __ cbnz(r0, pinned);
1536
1537 // We've succeeded, set sp to the ContinuationEntry
1538 __ ldr(rscratch1, Address(rthread, JavaThread::cont_entry_offset()));
1539 __ mov(sp, rscratch1);
1540 continuation_enter_cleanup(masm);
1541
1542 __ bind(pinned); // pinned -- return to caller
1543
1544 // handle pending exception thrown by freeze
1545 __ ldr(rscratch1, Address(rthread, in_bytes(Thread::pending_exception_offset())));
1546 Label ok;
1547 __ cbz(rscratch1, ok);
1548 __ leave();
1549 __ lea(rscratch1, RuntimeAddress(StubRoutines::forward_exception_entry()));
1550 __ br(rscratch1);
1551 __ bind(ok);
1552
1553 __ leave();
1554 __ ret(lr);
1555
1556 OopMap* map = new OopMap(framesize, 1);
1557 oop_maps->add_gc_map(the_pc - start, map);
1558 }
1559
1560 void SharedRuntime::continuation_enter_cleanup(MacroAssembler* masm) {
1561 ::continuation_enter_cleanup(masm);
1562 }
1563
1564 static void gen_special_dispatch(MacroAssembler* masm,
1565 const methodHandle& method,
1566 const BasicType* sig_bt,
1567 const VMRegPair* regs) {
1568 verify_oop_args(masm, method, sig_bt, regs);
1569 vmIntrinsics::ID iid = method->intrinsic_id();
1570
1571 // Now write the args into the outgoing interpreter space
1572 bool has_receiver = false;
1573 Register receiver_reg = noreg;
1574 int member_arg_pos = -1;
1575 Register member_reg = noreg;
1576 int ref_kind = MethodHandles::signature_polymorphic_intrinsic_ref_kind(iid);
1577 if (ref_kind != 0) {
1578 member_arg_pos = method->size_of_parameters() - 1; // trailing MemberName argument
1579 member_reg = r19; // known to be free at this point
1580 has_receiver = MethodHandles::ref_kind_has_receiver(ref_kind);
1581 } else if (iid == vmIntrinsics::_invokeBasic) {
1582 has_receiver = true;
1583 } else if (iid == vmIntrinsics::_linkToNative) {
1584 member_arg_pos = method->size_of_parameters() - 1; // trailing NativeEntryPoint argument
1585 member_reg = r19; // known to be free at this point
1586 } else {
1587 fatal("unexpected intrinsic id %d", vmIntrinsics::as_int(iid));
1588 }
1589
1590 if (member_reg != noreg) {
1591 // Load the member_arg into register, if necessary.
1592 SharedRuntime::check_member_name_argument_is_last_argument(method, sig_bt, regs);
1593 VMReg r = regs[member_arg_pos].first();
1594 if (r->is_stack()) {
1595 __ ldr(member_reg, Address(sp, r->reg2stack() * VMRegImpl::stack_slot_size));
1596 } else {
1597 // no data motion is needed
1598 member_reg = r->as_Register();
1599 }
1600 }
1601
1602 if (has_receiver) {
1603 // Make sure the receiver is loaded into a register.
1604 assert(method->size_of_parameters() > 0, "oob");
1605 assert(sig_bt[0] == T_OBJECT, "receiver argument must be an object");
1606 VMReg r = regs[0].first();
1607 assert(r->is_valid(), "bad receiver arg");
1608 if (r->is_stack()) {
1609 // Porting note: This assumes that compiled calling conventions always
1610 // pass the receiver oop in a register. If this is not true on some
1611 // platform, pick a temp and load the receiver from stack.
1612 fatal("receiver always in a register");
1613 receiver_reg = r2; // known to be free at this point
1614 __ ldr(receiver_reg, Address(sp, r->reg2stack() * VMRegImpl::stack_slot_size));
1615 } else {
1616 // no data motion is needed
1617 receiver_reg = r->as_Register();
1618 }
1619 }
1620
1621 // Figure out which address we are really jumping to:
1622 MethodHandles::generate_method_handle_dispatch(masm, iid,
1623 receiver_reg, member_reg, /*for_compiler_entry:*/ true);
1624 }
1625
1626 // ---------------------------------------------------------------------------
1627 // Generate a native wrapper for a given method. The method takes arguments
1628 // in the Java compiled code convention, marshals them to the native
1629 // convention (handlizes oops, etc), transitions to native, makes the call,
1630 // returns to java state (possibly blocking), unhandlizes any result and
1631 // returns.
1632 //
1633 // Critical native functions are a shorthand for the use of
1634 // GetPrimtiveArrayCritical and disallow the use of any other JNI
1635 // functions. The wrapper is expected to unpack the arguments before
1636 // passing them to the callee. Critical native functions leave the state _in_Java,
1637 // since they block out GC.
1638 // Some other parts of JNI setup are skipped like the tear down of the JNI handle
1639 // block and the check for pending exceptions it's impossible for them
1640 // to be thrown.
1641 //
1642 nmethod* SharedRuntime::generate_native_wrapper(MacroAssembler* masm,
1643 const methodHandle& method,
1644 int compile_id,
1645 BasicType* in_sig_bt,
1646 VMRegPair* in_regs,
1647 BasicType ret_type) {
1648 if (method->is_continuation_native_intrinsic()) {
1649 int exception_offset = -1;
1650 OopMapSet* oop_maps = new OopMapSet();
1651 int frame_complete = -1;
1652 int stack_slots = -1;
1653 int interpreted_entry_offset = -1;
1654 int vep_offset = -1;
1655 if (method->is_continuation_enter_intrinsic()) {
1656 gen_continuation_enter(masm,
1657 method,
1658 in_sig_bt,
1659 in_regs,
1660 exception_offset,
1661 oop_maps,
1662 frame_complete,
1663 stack_slots,
1664 interpreted_entry_offset,
1665 vep_offset);
1666 } else if (method->is_continuation_yield_intrinsic()) {
1667 gen_continuation_yield(masm,
1668 method,
1669 in_sig_bt,
1670 in_regs,
1671 oop_maps,
1672 frame_complete,
1673 stack_slots,
1674 vep_offset);
1675 } else {
1676 guarantee(false, "Unknown Continuation native intrinsic");
1677 }
1678
1679 #ifdef ASSERT
1680 if (method->is_continuation_enter_intrinsic()) {
1681 assert(interpreted_entry_offset != -1, "Must be set");
1682 assert(exception_offset != -1, "Must be set");
1683 } else {
1684 assert(interpreted_entry_offset == -1, "Must be unset");
1685 assert(exception_offset == -1, "Must be unset");
1686 }
1687 assert(frame_complete != -1, "Must be set");
1688 assert(stack_slots != -1, "Must be set");
1689 assert(vep_offset != -1, "Must be set");
1690 #endif
1691
1692 __ flush();
1693 nmethod* nm = nmethod::new_native_nmethod(method,
1694 compile_id,
1695 masm->code(),
1696 vep_offset,
1697 frame_complete,
1698 stack_slots,
1699 in_ByteSize(-1),
1700 in_ByteSize(-1),
1701 oop_maps,
1702 exception_offset);
1703 if (nm == nullptr) return nm;
1704 if (method->is_continuation_enter_intrinsic()) {
1705 ContinuationEntry::set_enter_code(nm, interpreted_entry_offset);
1706 } else if (method->is_continuation_yield_intrinsic()) {
1707 _cont_doYield_stub = nm;
1708 } else {
1709 guarantee(false, "Unknown Continuation native intrinsic");
1710 }
1711 return nm;
1712 }
1713
1714 if (method->is_method_handle_intrinsic()) {
1715 vmIntrinsics::ID iid = method->intrinsic_id();
1716 intptr_t start = (intptr_t)__ pc();
1717 int vep_offset = ((intptr_t)__ pc()) - start;
1718
1719 // First instruction must be a nop as it may need to be patched on deoptimisation
1720 __ nop();
1721 gen_special_dispatch(masm,
1722 method,
1723 in_sig_bt,
1724 in_regs);
1725 int frame_complete = ((intptr_t)__ pc()) - start; // not complete, period
1726 __ flush();
1727 int stack_slots = SharedRuntime::out_preserve_stack_slots(); // no out slots at all, actually
1728 return nmethod::new_native_nmethod(method,
1729 compile_id,
1730 masm->code(),
1731 vep_offset,
1732 frame_complete,
1733 stack_slots / VMRegImpl::slots_per_word,
1734 in_ByteSize(-1),
1735 in_ByteSize(-1),
1736 nullptr);
1737 }
1738 address native_func = method->native_function();
1739 assert(native_func != nullptr, "must have function");
1740
1741 // An OopMap for lock (and class if static)
1742 OopMapSet *oop_maps = new OopMapSet();
1743 intptr_t start = (intptr_t)__ pc();
1744
1745 // We have received a description of where all the java arg are located
1746 // on entry to the wrapper. We need to convert these args to where
1747 // the jni function will expect them. To figure out where they go
1748 // we convert the java signature to a C signature by inserting
1749 // the hidden arguments as arg[0] and possibly arg[1] (static method)
1750
1751 const int total_in_args = method->size_of_parameters();
1752 int total_c_args = total_in_args + (method->is_static() ? 2 : 1);
1753
1754 BasicType* out_sig_bt = NEW_RESOURCE_ARRAY(BasicType, total_c_args);
1755 VMRegPair* out_regs = NEW_RESOURCE_ARRAY(VMRegPair, total_c_args);
1756
1757 int argc = 0;
1758 out_sig_bt[argc++] = T_ADDRESS;
1759 if (method->is_static()) {
1760 out_sig_bt[argc++] = T_OBJECT;
1761 }
1762
1763 for (int i = 0; i < total_in_args ; i++ ) {
1764 out_sig_bt[argc++] = in_sig_bt[i];
1765 }
1766
1767 // Now figure out where the args must be stored and how much stack space
1768 // they require.
1769 int out_arg_slots;
1770 out_arg_slots = c_calling_convention_priv(out_sig_bt, out_regs, total_c_args);
1771
1772 if (out_arg_slots < 0) {
1773 return nullptr;
1774 }
1775
1776 // Compute framesize for the wrapper. We need to handlize all oops in
1777 // incoming registers
1778
1779 // Calculate the total number of stack slots we will need.
1780
1781 // First count the abi requirement plus all of the outgoing args
1782 int stack_slots = SharedRuntime::out_preserve_stack_slots() + out_arg_slots;
1783
1784 // Now the space for the inbound oop handle area
1785 int total_save_slots = 8 * VMRegImpl::slots_per_word; // 8 arguments passed in registers
1786
1787 int oop_handle_offset = stack_slots;
1788 stack_slots += total_save_slots;
1789
1790 // Now any space we need for handlizing a klass if static method
1791
1792 int klass_slot_offset = 0;
1793 int klass_offset = -1;
1794 int lock_slot_offset = 0;
1795 bool is_static = false;
1796
1797 if (method->is_static()) {
1798 klass_slot_offset = stack_slots;
1799 stack_slots += VMRegImpl::slots_per_word;
1800 klass_offset = klass_slot_offset * VMRegImpl::stack_slot_size;
1801 is_static = true;
1802 }
1803
1804 // Plus a lock if needed
1805
1806 if (method->is_synchronized()) {
1807 lock_slot_offset = stack_slots;
1808 stack_slots += VMRegImpl::slots_per_word;
1809 }
1810
1811 // Now a place (+2) to save return values or temp during shuffling
1812 // + 4 for return address (which we own) and saved rfp
1813 stack_slots += 6;
1814
1815 // Ok The space we have allocated will look like:
1816 //
1817 //
1818 // FP-> | |
1819 // |---------------------|
1820 // | 2 slots for moves |
1821 // |---------------------|
1822 // | lock box (if sync) |
1823 // |---------------------| <- lock_slot_offset
1824 // | klass (if static) |
1825 // |---------------------| <- klass_slot_offset
1826 // | oopHandle area |
1827 // |---------------------| <- oop_handle_offset (8 java arg registers)
1828 // | outbound memory |
1829 // | based arguments |
1830 // | |
1831 // |---------------------|
1832 // | |
1833 // SP-> | out_preserved_slots |
1834 //
1835 //
1836
1837
1838 // Now compute actual number of stack words we need rounding to make
1839 // stack properly aligned.
1840 stack_slots = align_up(stack_slots, StackAlignmentInSlots);
1841
1842 int stack_size = stack_slots * VMRegImpl::stack_slot_size;
1843
1844 // First thing make an ic check to see if we should even be here
1845
1846 // We are free to use all registers as temps without saving them and
1847 // restoring them except rfp. rfp is the only callee save register
1848 // as far as the interpreter and the compiler(s) are concerned.
1849
1850 const Register receiver = j_rarg0;
1851
1852 Label exception_pending;
1853
1854 assert_different_registers(receiver, rscratch1);
1855 __ verify_oop(receiver);
1856 __ ic_check(8 /* end_alignment */);
1857
1858 // Verified entry point must be aligned
1859 int vep_offset = ((intptr_t)__ pc()) - start;
1860
1861 // If we have to make this method not-entrant we'll overwrite its
1862 // first instruction with a jump. For this action to be legal we
1863 // must ensure that this first instruction is a B, BL, NOP, BKPT,
1864 // SVC, HVC, or SMC. Make it a NOP.
1865 __ nop();
1866
1867 if (VM_Version::supports_fast_class_init_checks() && method->needs_clinit_barrier()) {
1868 Label L_skip_barrier;
1869 __ mov_metadata(rscratch2, method->method_holder()); // InstanceKlass*
1870 __ clinit_barrier(rscratch2, rscratch1, &L_skip_barrier);
1871 __ far_jump(RuntimeAddress(SharedRuntime::get_handle_wrong_method_stub()));
1872
1873 __ bind(L_skip_barrier);
1874 }
1875
1876 // Generate stack overflow check
1877 __ bang_stack_with_offset(checked_cast<int>(StackOverflow::stack_shadow_zone_size()));
1878
1879 // Generate a new frame for the wrapper.
1880 __ enter();
1881 // -2 because return address is already present and so is saved rfp
1882 __ sub(sp, sp, stack_size - 2*wordSize);
1883
1884 BarrierSetAssembler* bs = BarrierSet::barrier_set()->barrier_set_assembler();
1885 bs->nmethod_entry_barrier(masm, nullptr /* slow_path */, nullptr /* continuation */, nullptr /* guard */);
1886
1887 // Frame is now completed as far as size and linkage.
1888 int frame_complete = ((intptr_t)__ pc()) - start;
1889
1890 // We use r20 as the oop handle for the receiver/klass
1891 // It is callee save so it survives the call to native
1892
1893 const Register oop_handle_reg = r20;
1894
1895 //
1896 // We immediately shuffle the arguments so that any vm call we have to
1897 // make from here on out (sync slow path, jvmti, etc.) we will have
1898 // captured the oops from our caller and have a valid oopMap for
1899 // them.
1900
1901 // -----------------
1902 // The Grand Shuffle
1903
1904 // The Java calling convention is either equal (linux) or denser (win64) than the
1905 // c calling convention. However the because of the jni_env argument the c calling
1906 // convention always has at least one more (and two for static) arguments than Java.
1907 // Therefore if we move the args from java -> c backwards then we will never have
1908 // a register->register conflict and we don't have to build a dependency graph
1909 // and figure out how to break any cycles.
1910 //
1911
1912 // Record esp-based slot for receiver on stack for non-static methods
1913 int receiver_offset = -1;
1914
1915 // This is a trick. We double the stack slots so we can claim
1916 // the oops in the caller's frame. Since we are sure to have
1917 // more args than the caller doubling is enough to make
1918 // sure we can capture all the incoming oop args from the
1919 // caller.
1920 //
1921 OopMap* map = new OopMap(stack_slots * 2, 0 /* arg_slots*/);
1922
1923 // Mark location of rfp (someday)
1924 // map->set_callee_saved(VMRegImpl::stack2reg( stack_slots - 2), stack_slots * 2, 0, vmreg(rfp));
1925
1926
1927 int float_args = 0;
1928 int int_args = 0;
1929
1930 #ifdef ASSERT
1931 bool reg_destroyed[Register::number_of_registers];
1932 bool freg_destroyed[FloatRegister::number_of_registers];
1933 for ( int r = 0 ; r < Register::number_of_registers ; r++ ) {
1934 reg_destroyed[r] = false;
1935 }
1936 for ( int f = 0 ; f < FloatRegister::number_of_registers ; f++ ) {
1937 freg_destroyed[f] = false;
1938 }
1939
1940 #endif /* ASSERT */
1941
1942 // For JNI natives the incoming and outgoing registers are offset upwards.
1943 GrowableArray<int> arg_order(2 * total_in_args);
1944
1945 for (int i = total_in_args - 1, c_arg = total_c_args - 1; i >= 0; i--, c_arg--) {
1946 arg_order.push(i);
1947 arg_order.push(c_arg);
1948 }
1949
1950 for (int ai = 0; ai < arg_order.length(); ai += 2) {
1951 int i = arg_order.at(ai);
1952 int c_arg = arg_order.at(ai + 1);
1953 __ block_comment(err_msg("move %d -> %d", i, c_arg));
1954 assert(c_arg != -1 && i != -1, "wrong order");
1955 #ifdef ASSERT
1956 if (in_regs[i].first()->is_Register()) {
1957 assert(!reg_destroyed[in_regs[i].first()->as_Register()->encoding()], "destroyed reg!");
1958 } else if (in_regs[i].first()->is_FloatRegister()) {
1959 assert(!freg_destroyed[in_regs[i].first()->as_FloatRegister()->encoding()], "destroyed reg!");
1960 }
1961 if (out_regs[c_arg].first()->is_Register()) {
1962 reg_destroyed[out_regs[c_arg].first()->as_Register()->encoding()] = true;
1963 } else if (out_regs[c_arg].first()->is_FloatRegister()) {
1964 freg_destroyed[out_regs[c_arg].first()->as_FloatRegister()->encoding()] = true;
1965 }
1966 #endif /* ASSERT */
1967 switch (in_sig_bt[i]) {
1968 case T_ARRAY:
1969 case T_OBJECT:
1970 __ object_move(map, oop_handle_offset, stack_slots, in_regs[i], out_regs[c_arg],
1971 ((i == 0) && (!is_static)),
1972 &receiver_offset);
1973 int_args++;
1974 break;
1975 case T_VOID:
1976 break;
1977
1978 case T_FLOAT:
1979 __ float_move(in_regs[i], out_regs[c_arg]);
1980 float_args++;
1981 break;
1982
1983 case T_DOUBLE:
1984 assert( i + 1 < total_in_args &&
1985 in_sig_bt[i + 1] == T_VOID &&
1986 out_sig_bt[c_arg+1] == T_VOID, "bad arg list");
1987 __ double_move(in_regs[i], out_regs[c_arg]);
1988 float_args++;
1989 break;
1990
1991 case T_LONG :
1992 __ long_move(in_regs[i], out_regs[c_arg]);
1993 int_args++;
1994 break;
1995
1996 case T_ADDRESS: assert(false, "found T_ADDRESS in java args");
1997
1998 default:
1999 __ move32_64(in_regs[i], out_regs[c_arg]);
2000 int_args++;
2001 }
2002 }
2003
2004 // point c_arg at the first arg that is already loaded in case we
2005 // need to spill before we call out
2006 int c_arg = total_c_args - total_in_args;
2007
2008 // Pre-load a static method's oop into c_rarg1.
2009 if (method->is_static()) {
2010
2011 // load oop into a register
2012 __ movoop(c_rarg1,
2013 JNIHandles::make_local(method->method_holder()->java_mirror()));
2014
2015 // Now handlize the static class mirror it's known not-null.
2016 __ str(c_rarg1, Address(sp, klass_offset));
2017 map->set_oop(VMRegImpl::stack2reg(klass_slot_offset));
2018
2019 // Now get the handle
2020 __ lea(c_rarg1, Address(sp, klass_offset));
2021 // and protect the arg if we must spill
2022 c_arg--;
2023 }
2024
2025 // Change state to native (we save the return address in the thread, since it might not
2026 // be pushed on the stack when we do a stack traversal). It is enough that the pc()
2027 // points into the right code segment. It does not have to be the correct return pc.
2028 // We use the same pc/oopMap repeatedly when we call out.
2029
2030 Label native_return;
2031 if (LockingMode != LM_LEGACY && method->is_object_wait0()) {
2032 // For convenience we use the pc we want to resume to in case of preemption on Object.wait.
2033 __ set_last_Java_frame(sp, noreg, native_return, rscratch1);
2034 } else {
2035 intptr_t the_pc = (intptr_t) __ pc();
2036 oop_maps->add_gc_map(the_pc - start, map);
2037
2038 __ set_last_Java_frame(sp, noreg, __ pc(), rscratch1);
2039 }
2040
2041 Label dtrace_method_entry, dtrace_method_entry_done;
2042 if (DTraceMethodProbes) {
2043 __ b(dtrace_method_entry);
2044 __ bind(dtrace_method_entry_done);
2045 }
2046
2047 // RedefineClasses() tracing support for obsolete method entry
2048 if (log_is_enabled(Trace, redefine, class, obsolete)) {
2049 // protect the args we've loaded
2050 save_args(masm, total_c_args, c_arg, out_regs);
2051 __ mov_metadata(c_rarg1, method());
2052 __ call_VM_leaf(
2053 CAST_FROM_FN_PTR(address, SharedRuntime::rc_trace_method_entry),
2054 rthread, c_rarg1);
2055 restore_args(masm, total_c_args, c_arg, out_regs);
2056 }
2057
2058 // Lock a synchronized method
2059
2060 // Register definitions used by locking and unlocking
2061
2062 const Register swap_reg = r0;
2063 const Register obj_reg = r19; // Will contain the oop
2064 const Register lock_reg = r13; // Address of compiler lock object (BasicLock)
2065 const Register old_hdr = r13; // value of old header at unlock time
2066 const Register lock_tmp = r14; // Temporary used by lightweight_lock/unlock
2067 const Register tmp = lr;
2068
2069 Label slow_path_lock;
2070 Label lock_done;
2071
2072 if (method->is_synchronized()) {
2073 Label count;
2074 const int mark_word_offset = BasicLock::displaced_header_offset_in_bytes();
2075
2076 // Get the handle (the 2nd argument)
2077 __ mov(oop_handle_reg, c_rarg1);
2078
2079 // Get address of the box
2080
2081 __ lea(lock_reg, Address(sp, lock_slot_offset * VMRegImpl::stack_slot_size));
2082
2083 // Load the oop from the handle
2084 __ ldr(obj_reg, Address(oop_handle_reg, 0));
2085
2086 if (LockingMode == LM_MONITOR) {
2087 __ b(slow_path_lock);
2088 } else if (LockingMode == LM_LEGACY) {
2089 // Load (object->mark() | 1) into swap_reg %r0
2090 __ ldr(rscratch1, Address(obj_reg, oopDesc::mark_offset_in_bytes()));
2091 __ orr(swap_reg, rscratch1, 1);
2092 if (EnableValhalla) {
2093 // Mask inline_type bit such that we go to the slow path if object is an inline type
2094 __ andr(swap_reg, swap_reg, ~((int) markWord::inline_type_bit_in_place));
2095 }
2096
2097 // Save (object->mark() | 1) into BasicLock's displaced header
2098 __ str(swap_reg, Address(lock_reg, mark_word_offset));
2099
2100 // src -> dest iff dest == r0 else r0 <- dest
2101 __ cmpxchg_obj_header(r0, lock_reg, obj_reg, rscratch1, count, /*fallthrough*/nullptr);
2102
2103 // Hmm should this move to the slow path code area???
2104
2105 // Test if the oopMark is an obvious stack pointer, i.e.,
2106 // 1) (mark & 3) == 0, and
2107 // 2) sp <= mark < mark + os::pagesize()
2108 // These 3 tests can be done by evaluating the following
2109 // expression: ((mark - sp) & (3 - os::vm_page_size())),
2110 // assuming both stack pointer and pagesize have their
2111 // least significant 2 bits clear.
2112 // NOTE: the oopMark is in swap_reg %r0 as the result of cmpxchg
2113
2114 __ sub(swap_reg, sp, swap_reg);
2115 __ neg(swap_reg, swap_reg);
2116 __ ands(swap_reg, swap_reg, 3 - (int)os::vm_page_size());
2117
2118 // Save the test result, for recursive case, the result is zero
2119 __ str(swap_reg, Address(lock_reg, mark_word_offset));
2120 __ br(Assembler::NE, slow_path_lock);
2121
2122 __ bind(count);
2123 __ inc_held_monitor_count(rscratch1);
2124 } else {
2125 assert(LockingMode == LM_LIGHTWEIGHT, "must be");
2126 __ lightweight_lock(lock_reg, obj_reg, swap_reg, tmp, lock_tmp, slow_path_lock);
2127 }
2128
2129 // Slow path will re-enter here
2130 __ bind(lock_done);
2131 }
2132
2133
2134 // Finally just about ready to make the JNI call
2135
2136 // get JNIEnv* which is first argument to native
2137 __ lea(c_rarg0, Address(rthread, in_bytes(JavaThread::jni_environment_offset())));
2138
2139 // Now set thread in native
2140 __ mov(rscratch1, _thread_in_native);
2141 __ lea(rscratch2, Address(rthread, JavaThread::thread_state_offset()));
2142 __ stlrw(rscratch1, rscratch2);
2143
2144 __ rt_call(native_func);
2145
2146 // Verify or restore cpu control state after JNI call
2147 __ restore_cpu_control_state_after_jni(rscratch1, rscratch2);
2148
2149 // Unpack native results.
2150 switch (ret_type) {
2151 case T_BOOLEAN: __ c2bool(r0); break;
2152 case T_CHAR : __ ubfx(r0, r0, 0, 16); break;
2153 case T_BYTE : __ sbfx(r0, r0, 0, 8); break;
2154 case T_SHORT : __ sbfx(r0, r0, 0, 16); break;
2155 case T_INT : __ sbfx(r0, r0, 0, 32); break;
2156 case T_DOUBLE :
2157 case T_FLOAT :
2158 // Result is in v0 we'll save as needed
2159 break;
2160 case T_ARRAY: // Really a handle
2161 case T_OBJECT: // Really a handle
2162 break; // can't de-handlize until after safepoint check
2163 case T_VOID: break;
2164 case T_LONG: break;
2165 default : ShouldNotReachHere();
2166 }
2167
2168 Label safepoint_in_progress, safepoint_in_progress_done;
2169
2170 // Switch thread to "native transition" state before reading the synchronization state.
2171 // This additional state is necessary because reading and testing the synchronization
2172 // state is not atomic w.r.t. GC, as this scenario demonstrates:
2173 // Java thread A, in _thread_in_native state, loads _not_synchronized and is preempted.
2174 // VM thread changes sync state to synchronizing and suspends threads for GC.
2175 // Thread A is resumed to finish this native method, but doesn't block here since it
2176 // didn't see any synchronization is progress, and escapes.
2177 __ mov(rscratch1, _thread_in_native_trans);
2178
2179 __ strw(rscratch1, Address(rthread, JavaThread::thread_state_offset()));
2180
2181 // Force this write out before the read below
2182 if (!UseSystemMemoryBarrier) {
2183 __ dmb(Assembler::ISH);
2184 }
2185
2186 __ verify_sve_vector_length();
2187
2188 // Check for safepoint operation in progress and/or pending suspend requests.
2189 {
2190 // No need for acquire as Java threads always disarm themselves.
2191 __ safepoint_poll(safepoint_in_progress, true /* at_return */, false /* acquire */, false /* in_nmethod */);
2192 __ ldrw(rscratch1, Address(rthread, JavaThread::suspend_flags_offset()));
2193 __ cbnzw(rscratch1, safepoint_in_progress);
2194 __ bind(safepoint_in_progress_done);
2195 }
2196
2197 // change thread state
2198 __ mov(rscratch1, _thread_in_Java);
2199 __ lea(rscratch2, Address(rthread, JavaThread::thread_state_offset()));
2200 __ stlrw(rscratch1, rscratch2);
2201
2202 if (LockingMode != LM_LEGACY && method->is_object_wait0()) {
2203 // Check preemption for Object.wait()
2204 __ ldr(rscratch1, Address(rthread, JavaThread::preempt_alternate_return_offset()));
2205 __ cbz(rscratch1, native_return);
2206 __ str(zr, Address(rthread, JavaThread::preempt_alternate_return_offset()));
2207 __ br(rscratch1);
2208 __ bind(native_return);
2209
2210 intptr_t the_pc = (intptr_t) __ pc();
2211 oop_maps->add_gc_map(the_pc - start, map);
2212 }
2213
2214 Label reguard;
2215 Label reguard_done;
2216 __ ldrb(rscratch1, Address(rthread, JavaThread::stack_guard_state_offset()));
2217 __ cmpw(rscratch1, StackOverflow::stack_guard_yellow_reserved_disabled);
2218 __ br(Assembler::EQ, reguard);
2219 __ bind(reguard_done);
2220
2221 // native result if any is live
2222
2223 // Unlock
2224 Label unlock_done;
2225 Label slow_path_unlock;
2226 if (method->is_synchronized()) {
2227
2228 // Get locked oop from the handle we passed to jni
2229 __ ldr(obj_reg, Address(oop_handle_reg, 0));
2230
2231 Label done, not_recursive;
2232
2233 if (LockingMode == LM_LEGACY) {
2234 // Simple recursive lock?
2235 __ ldr(rscratch1, Address(sp, lock_slot_offset * VMRegImpl::stack_slot_size));
2236 __ cbnz(rscratch1, not_recursive);
2237 __ dec_held_monitor_count(rscratch1);
2238 __ b(done);
2239 }
2240
2241 __ bind(not_recursive);
2242
2243 // Must save r0 if if it is live now because cmpxchg must use it
2244 if (ret_type != T_FLOAT && ret_type != T_DOUBLE && ret_type != T_VOID) {
2245 save_native_result(masm, ret_type, stack_slots);
2246 }
2247
2248 if (LockingMode == LM_MONITOR) {
2249 __ b(slow_path_unlock);
2250 } else if (LockingMode == LM_LEGACY) {
2251 // get address of the stack lock
2252 __ lea(r0, Address(sp, lock_slot_offset * VMRegImpl::stack_slot_size));
2253 // get old displaced header
2254 __ ldr(old_hdr, Address(r0, 0));
2255
2256 // Atomic swap old header if oop still contains the stack lock
2257 Label count;
2258 __ cmpxchg_obj_header(r0, old_hdr, obj_reg, rscratch1, count, &slow_path_unlock);
2259 __ bind(count);
2260 __ dec_held_monitor_count(rscratch1);
2261 } else {
2262 assert(LockingMode == LM_LIGHTWEIGHT, "");
2263 __ lightweight_unlock(obj_reg, old_hdr, swap_reg, lock_tmp, slow_path_unlock);
2264 }
2265
2266 // slow path re-enters here
2267 __ bind(unlock_done);
2268 if (ret_type != T_FLOAT && ret_type != T_DOUBLE && ret_type != T_VOID) {
2269 restore_native_result(masm, ret_type, stack_slots);
2270 }
2271
2272 __ bind(done);
2273 }
2274
2275 Label dtrace_method_exit, dtrace_method_exit_done;
2276 if (DTraceMethodProbes) {
2277 __ b(dtrace_method_exit);
2278 __ bind(dtrace_method_exit_done);
2279 }
2280
2281 __ reset_last_Java_frame(false);
2282
2283 // Unbox oop result, e.g. JNIHandles::resolve result.
2284 if (is_reference_type(ret_type)) {
2285 __ resolve_jobject(r0, r1, r2);
2286 }
2287
2288 if (CheckJNICalls) {
2289 // clear_pending_jni_exception_check
2290 __ str(zr, Address(rthread, JavaThread::pending_jni_exception_check_fn_offset()));
2291 }
2292
2293 // reset handle block
2294 __ ldr(r2, Address(rthread, JavaThread::active_handles_offset()));
2295 __ str(zr, Address(r2, JNIHandleBlock::top_offset()));
2296
2297 __ leave();
2298
2299 // Any exception pending?
2300 __ ldr(rscratch1, Address(rthread, in_bytes(Thread::pending_exception_offset())));
2301 __ cbnz(rscratch1, exception_pending);
2302
2303 // We're done
2304 __ ret(lr);
2305
2306 // Unexpected paths are out of line and go here
2307
2308 // forward the exception
2309 __ bind(exception_pending);
2310
2311 // and forward the exception
2312 __ far_jump(RuntimeAddress(StubRoutines::forward_exception_entry()));
2313
2314 // Slow path locking & unlocking
2315 if (method->is_synchronized()) {
2316
2317 __ block_comment("Slow path lock {");
2318 __ bind(slow_path_lock);
2319
2320 // has last_Java_frame setup. No exceptions so do vanilla call not call_VM
2321 // args are (oop obj, BasicLock* lock, JavaThread* thread)
2322
2323 // protect the args we've loaded
2324 save_args(masm, total_c_args, c_arg, out_regs);
2325
2326 __ mov(c_rarg0, obj_reg);
2327 __ mov(c_rarg1, lock_reg);
2328 __ mov(c_rarg2, rthread);
2329
2330 // Not a leaf but we have last_Java_frame setup as we want.
2331 // We don't want to unmount in case of contention since that would complicate preserving
2332 // the arguments that had already been marshalled into the native convention. So we force
2333 // the freeze slow path to find this native wrapper frame (see recurse_freeze_native_frame())
2334 // and pin the vthread. Otherwise the fast path won't find it since we don't walk the stack.
2335 __ push_cont_fastpath();
2336 __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::complete_monitor_locking_C), 3);
2337 __ pop_cont_fastpath();
2338 restore_args(masm, total_c_args, c_arg, out_regs);
2339
2340 #ifdef ASSERT
2341 { Label L;
2342 __ ldr(rscratch1, Address(rthread, in_bytes(Thread::pending_exception_offset())));
2343 __ cbz(rscratch1, L);
2344 __ stop("no pending exception allowed on exit from monitorenter");
2345 __ bind(L);
2346 }
2347 #endif
2348 __ b(lock_done);
2349
2350 __ block_comment("} Slow path lock");
2351
2352 __ block_comment("Slow path unlock {");
2353 __ bind(slow_path_unlock);
2354
2355 // If we haven't already saved the native result we must save it now as xmm registers
2356 // are still exposed.
2357
2358 if (ret_type == T_FLOAT || ret_type == T_DOUBLE ) {
2359 save_native_result(masm, ret_type, stack_slots);
2360 }
2361
2362 __ mov(c_rarg2, rthread);
2363 __ lea(c_rarg1, Address(sp, lock_slot_offset * VMRegImpl::stack_slot_size));
2364 __ mov(c_rarg0, obj_reg);
2365
2366 // Save pending exception around call to VM (which contains an EXCEPTION_MARK)
2367 // NOTE that obj_reg == r19 currently
2368 __ ldr(r19, Address(rthread, in_bytes(Thread::pending_exception_offset())));
2369 __ str(zr, Address(rthread, in_bytes(Thread::pending_exception_offset())));
2370
2371 __ rt_call(CAST_FROM_FN_PTR(address, SharedRuntime::complete_monitor_unlocking_C));
2372
2373 #ifdef ASSERT
2374 {
2375 Label L;
2376 __ ldr(rscratch1, Address(rthread, in_bytes(Thread::pending_exception_offset())));
2377 __ cbz(rscratch1, L);
2378 __ stop("no pending exception allowed on exit complete_monitor_unlocking_C");
2379 __ bind(L);
2380 }
2381 #endif /* ASSERT */
2382
2383 __ str(r19, Address(rthread, in_bytes(Thread::pending_exception_offset())));
2384
2385 if (ret_type == T_FLOAT || ret_type == T_DOUBLE ) {
2386 restore_native_result(masm, ret_type, stack_slots);
2387 }
2388 __ b(unlock_done);
2389
2390 __ block_comment("} Slow path unlock");
2391
2392 } // synchronized
2393
2394 // SLOW PATH Reguard the stack if needed
2395
2396 __ bind(reguard);
2397 save_native_result(masm, ret_type, stack_slots);
2398 __ rt_call(CAST_FROM_FN_PTR(address, SharedRuntime::reguard_yellow_pages));
2399 restore_native_result(masm, ret_type, stack_slots);
2400 // and continue
2401 __ b(reguard_done);
2402
2403 // SLOW PATH safepoint
2404 {
2405 __ block_comment("safepoint {");
2406 __ bind(safepoint_in_progress);
2407
2408 // Don't use call_VM as it will see a possible pending exception and forward it
2409 // and never return here preventing us from clearing _last_native_pc down below.
2410 //
2411 save_native_result(masm, ret_type, stack_slots);
2412 __ mov(c_rarg0, rthread);
2413 #ifndef PRODUCT
2414 assert(frame::arg_reg_save_area_bytes == 0, "not expecting frame reg save area");
2415 #endif
2416 __ lea(rscratch1, RuntimeAddress(CAST_FROM_FN_PTR(address, JavaThread::check_special_condition_for_native_trans)));
2417 __ blr(rscratch1);
2418
2419 // Restore any method result value
2420 restore_native_result(masm, ret_type, stack_slots);
2421
2422 __ b(safepoint_in_progress_done);
2423 __ block_comment("} safepoint");
2424 }
2425
2426 // SLOW PATH dtrace support
2427 if (DTraceMethodProbes) {
2428 {
2429 __ block_comment("dtrace entry {");
2430 __ bind(dtrace_method_entry);
2431
2432 // We have all of the arguments setup at this point. We must not touch any register
2433 // argument registers at this point (what if we save/restore them there are no oop?
2434
2435 save_args(masm, total_c_args, c_arg, out_regs);
2436 __ mov_metadata(c_rarg1, method());
2437 __ call_VM_leaf(
2438 CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_entry),
2439 rthread, c_rarg1);
2440 restore_args(masm, total_c_args, c_arg, out_regs);
2441 __ b(dtrace_method_entry_done);
2442 __ block_comment("} dtrace entry");
2443 }
2444
2445 {
2446 __ block_comment("dtrace exit {");
2447 __ bind(dtrace_method_exit);
2448 save_native_result(masm, ret_type, stack_slots);
2449 __ mov_metadata(c_rarg1, method());
2450 __ call_VM_leaf(
2451 CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit),
2452 rthread, c_rarg1);
2453 restore_native_result(masm, ret_type, stack_slots);
2454 __ b(dtrace_method_exit_done);
2455 __ block_comment("} dtrace exit");
2456 }
2457 }
2458
2459 __ flush();
2460
2461 nmethod *nm = nmethod::new_native_nmethod(method,
2462 compile_id,
2463 masm->code(),
2464 vep_offset,
2465 frame_complete,
2466 stack_slots / VMRegImpl::slots_per_word,
2467 (is_static ? in_ByteSize(klass_offset) : in_ByteSize(receiver_offset)),
2468 in_ByteSize(lock_slot_offset*VMRegImpl::stack_slot_size),
2469 oop_maps);
2470
2471 return nm;
2472 }
2473
2474 // this function returns the adjust size (in number of words) to a c2i adapter
2475 // activation for use during deoptimization
2476 int Deoptimization::last_frame_adjust(int callee_parameters, int callee_locals) {
2477 assert(callee_locals >= callee_parameters,
2478 "test and remove; got more parms than locals");
2479 if (callee_locals < callee_parameters)
2480 return 0; // No adjustment for negative locals
2481 int diff = (callee_locals - callee_parameters) * Interpreter::stackElementWords;
2482 // diff is counted in stack words
2483 return align_up(diff, 2);
2484 }
2485
2486
2487 //------------------------------generate_deopt_blob----------------------------
2488 void SharedRuntime::generate_deopt_blob() {
2489 // Allocate space for the code
2490 ResourceMark rm;
2491 // Setup code generation tools
2492 int pad = 0;
2493 #if INCLUDE_JVMCI
2494 if (EnableJVMCI) {
2495 pad += 512; // Increase the buffer size when compiling for JVMCI
2496 }
2497 #endif
2498 const char* name = SharedRuntime::stub_name(SharedStubId::deopt_id);
2499 CodeBuffer buffer(name, 2048+pad, 1024);
2500 MacroAssembler* masm = new MacroAssembler(&buffer);
2501 int frame_size_in_words;
2502 OopMap* map = nullptr;
2503 OopMapSet *oop_maps = new OopMapSet();
2504 RegisterSaver reg_save(COMPILER2_OR_JVMCI != 0);
2505
2506 // -------------
2507 // This code enters when returning to a de-optimized nmethod. A return
2508 // address has been pushed on the stack, and return values are in
2509 // registers.
2510 // If we are doing a normal deopt then we were called from the patched
2511 // nmethod from the point we returned to the nmethod. So the return
2512 // address on the stack is wrong by NativeCall::instruction_size
2513 // We will adjust the value so it looks like we have the original return
2514 // address on the stack (like when we eagerly deoptimized).
2515 // In the case of an exception pending when deoptimizing, we enter
2516 // with a return address on the stack that points after the call we patched
2517 // into the exception handler. We have the following register state from,
2518 // e.g., the forward exception stub (see stubGenerator_x86_64.cpp).
2519 // r0: exception oop
2520 // r19: exception handler
2521 // r3: throwing pc
2522 // So in this case we simply jam r3 into the useless return address and
2523 // the stack looks just like we want.
2524 //
2525 // At this point we need to de-opt. We save the argument return
2526 // registers. We call the first C routine, fetch_unroll_info(). This
2527 // routine captures the return values and returns a structure which
2528 // describes the current frame size and the sizes of all replacement frames.
2529 // The current frame is compiled code and may contain many inlined
2530 // functions, each with their own JVM state. We pop the current frame, then
2531 // push all the new frames. Then we call the C routine unpack_frames() to
2532 // populate these frames. Finally unpack_frames() returns us the new target
2533 // address. Notice that callee-save registers are BLOWN here; they have
2534 // already been captured in the vframeArray at the time the return PC was
2535 // patched.
2536 address start = __ pc();
2537 Label cont;
2538
2539 // Prolog for non exception case!
2540
2541 // Save everything in sight.
2542 map = reg_save.save_live_registers(masm, 0, &frame_size_in_words);
2543
2544 // Normal deoptimization. Save exec mode for unpack_frames.
2545 __ movw(rcpool, Deoptimization::Unpack_deopt); // callee-saved
2546 __ b(cont);
2547
2548 int reexecute_offset = __ pc() - start;
2549 #if INCLUDE_JVMCI && !defined(COMPILER1)
2550 if (UseJVMCICompiler) {
2551 // JVMCI does not use this kind of deoptimization
2552 __ should_not_reach_here();
2553 }
2554 #endif
2555
2556 // Reexecute case
2557 // return address is the pc describes what bci to do re-execute at
2558
2559 // No need to update map as each call to save_live_registers will produce identical oopmap
2560 (void) reg_save.save_live_registers(masm, 0, &frame_size_in_words);
2561
2562 __ movw(rcpool, Deoptimization::Unpack_reexecute); // callee-saved
2563 __ b(cont);
2564
2565 #if INCLUDE_JVMCI
2566 Label after_fetch_unroll_info_call;
2567 int implicit_exception_uncommon_trap_offset = 0;
2568 int uncommon_trap_offset = 0;
2569
2570 if (EnableJVMCI) {
2571 implicit_exception_uncommon_trap_offset = __ pc() - start;
2572
2573 __ ldr(lr, Address(rthread, in_bytes(JavaThread::jvmci_implicit_exception_pc_offset())));
2574 __ str(zr, Address(rthread, in_bytes(JavaThread::jvmci_implicit_exception_pc_offset())));
2575
2576 uncommon_trap_offset = __ pc() - start;
2577
2578 // Save everything in sight.
2579 reg_save.save_live_registers(masm, 0, &frame_size_in_words);
2580 // fetch_unroll_info needs to call last_java_frame()
2581 Label retaddr;
2582 __ set_last_Java_frame(sp, noreg, retaddr, rscratch1);
2583
2584 __ ldrw(c_rarg1, Address(rthread, in_bytes(JavaThread::pending_deoptimization_offset())));
2585 __ movw(rscratch1, -1);
2586 __ strw(rscratch1, Address(rthread, in_bytes(JavaThread::pending_deoptimization_offset())));
2587
2588 __ movw(rcpool, (int32_t)Deoptimization::Unpack_reexecute);
2589 __ mov(c_rarg0, rthread);
2590 __ movw(c_rarg2, rcpool); // exec mode
2591 __ lea(rscratch1,
2592 RuntimeAddress(CAST_FROM_FN_PTR(address,
2593 Deoptimization::uncommon_trap)));
2594 __ blr(rscratch1);
2595 __ bind(retaddr);
2596 oop_maps->add_gc_map( __ pc()-start, map->deep_copy());
2597
2598 __ reset_last_Java_frame(false);
2599
2600 __ b(after_fetch_unroll_info_call);
2601 } // EnableJVMCI
2602 #endif // INCLUDE_JVMCI
2603
2604 int exception_offset = __ pc() - start;
2605
2606 // Prolog for exception case
2607
2608 // all registers are dead at this entry point, except for r0, and
2609 // r3 which contain the exception oop and exception pc
2610 // respectively. Set them in TLS and fall thru to the
2611 // unpack_with_exception_in_tls entry point.
2612
2613 __ str(r3, Address(rthread, JavaThread::exception_pc_offset()));
2614 __ str(r0, Address(rthread, JavaThread::exception_oop_offset()));
2615
2616 int exception_in_tls_offset = __ pc() - start;
2617
2618 // new implementation because exception oop is now passed in JavaThread
2619
2620 // Prolog for exception case
2621 // All registers must be preserved because they might be used by LinearScan
2622 // Exceptiop oop and throwing PC are passed in JavaThread
2623 // tos: stack at point of call to method that threw the exception (i.e. only
2624 // args are on the stack, no return address)
2625
2626 // The return address pushed by save_live_registers will be patched
2627 // later with the throwing pc. The correct value is not available
2628 // now because loading it from memory would destroy registers.
2629
2630 // NB: The SP at this point must be the SP of the method that is
2631 // being deoptimized. Deoptimization assumes that the frame created
2632 // here by save_live_registers is immediately below the method's SP.
2633 // This is a somewhat fragile mechanism.
2634
2635 // Save everything in sight.
2636 map = reg_save.save_live_registers(masm, 0, &frame_size_in_words);
2637
2638 // Now it is safe to overwrite any register
2639
2640 // Deopt during an exception. Save exec mode for unpack_frames.
2641 __ mov(rcpool, Deoptimization::Unpack_exception); // callee-saved
2642
2643 // load throwing pc from JavaThread and patch it as the return address
2644 // of the current frame. Then clear the field in JavaThread
2645 __ ldr(r3, Address(rthread, JavaThread::exception_pc_offset()));
2646 __ protect_return_address(r3);
2647 __ str(r3, Address(rfp, wordSize));
2648 __ str(zr, Address(rthread, JavaThread::exception_pc_offset()));
2649
2650 #ifdef ASSERT
2651 // verify that there is really an exception oop in JavaThread
2652 __ ldr(r0, Address(rthread, JavaThread::exception_oop_offset()));
2653 __ verify_oop(r0);
2654
2655 // verify that there is no pending exception
2656 Label no_pending_exception;
2657 __ ldr(rscratch1, Address(rthread, Thread::pending_exception_offset()));
2658 __ cbz(rscratch1, no_pending_exception);
2659 __ stop("must not have pending exception here");
2660 __ bind(no_pending_exception);
2661 #endif
2662
2663 __ bind(cont);
2664
2665 // Call C code. Need thread and this frame, but NOT official VM entry
2666 // crud. We cannot block on this call, no GC can happen.
2667 //
2668 // UnrollBlock* fetch_unroll_info(JavaThread* thread)
2669
2670 // fetch_unroll_info needs to call last_java_frame().
2671
2672 Label retaddr;
2673 __ set_last_Java_frame(sp, noreg, retaddr, rscratch1);
2674 #ifdef ASSERT
2675 { Label L;
2676 __ ldr(rscratch1, Address(rthread, JavaThread::last_Java_fp_offset()));
2677 __ cbz(rscratch1, L);
2678 __ stop("SharedRuntime::generate_deopt_blob: last_Java_fp not cleared");
2679 __ bind(L);
2680 }
2681 #endif // ASSERT
2682 __ mov(c_rarg0, rthread);
2683 __ mov(c_rarg1, rcpool);
2684 __ lea(rscratch1, RuntimeAddress(CAST_FROM_FN_PTR(address, Deoptimization::fetch_unroll_info)));
2685 __ blr(rscratch1);
2686 __ bind(retaddr);
2687
2688 // Need to have an oopmap that tells fetch_unroll_info where to
2689 // find any register it might need.
2690 oop_maps->add_gc_map(__ pc() - start, map);
2691
2692 __ reset_last_Java_frame(false);
2693
2694 #if INCLUDE_JVMCI
2695 if (EnableJVMCI) {
2696 __ bind(after_fetch_unroll_info_call);
2697 }
2698 #endif
2699
2700 // Load UnrollBlock* into r5
2701 __ mov(r5, r0);
2702
2703 __ ldrw(rcpool, Address(r5, Deoptimization::UnrollBlock::unpack_kind_offset()));
2704 Label noException;
2705 __ cmpw(rcpool, Deoptimization::Unpack_exception); // Was exception pending?
2706 __ br(Assembler::NE, noException);
2707 __ ldr(r0, Address(rthread, JavaThread::exception_oop_offset()));
2708 // QQQ this is useless it was null above
2709 __ ldr(r3, Address(rthread, JavaThread::exception_pc_offset()));
2710 __ str(zr, Address(rthread, JavaThread::exception_oop_offset()));
2711 __ str(zr, Address(rthread, JavaThread::exception_pc_offset()));
2712
2713 __ verify_oop(r0);
2714
2715 // Overwrite the result registers with the exception results.
2716 __ str(r0, Address(sp, reg_save.r0_offset_in_bytes()));
2717 // I think this is useless
2718 // __ str(r3, Address(sp, RegisterSaver::r3_offset_in_bytes()));
2719
2720 __ bind(noException);
2721
2722 // Only register save data is on the stack.
2723 // Now restore the result registers. Everything else is either dead
2724 // or captured in the vframeArray.
2725
2726 // Restore fp result register
2727 __ ldrd(v0, Address(sp, reg_save.v0_offset_in_bytes()));
2728 // Restore integer result register
2729 __ ldr(r0, Address(sp, reg_save.r0_offset_in_bytes()));
2730
2731 // Pop all of the register save area off the stack
2732 __ add(sp, sp, frame_size_in_words * wordSize);
2733
2734 // All of the register save area has been popped of the stack. Only the
2735 // return address remains.
2736
2737 // Pop all the frames we must move/replace.
2738 //
2739 // Frame picture (youngest to oldest)
2740 // 1: self-frame (no frame link)
2741 // 2: deopting frame (no frame link)
2742 // 3: caller of deopting frame (could be compiled/interpreted).
2743 //
2744 // Note: by leaving the return address of self-frame on the stack
2745 // and using the size of frame 2 to adjust the stack
2746 // when we are done the return to frame 3 will still be on the stack.
2747
2748 // Pop deoptimized frame
2749 __ ldrw(r2, Address(r5, Deoptimization::UnrollBlock::size_of_deoptimized_frame_offset()));
2750 __ sub(r2, r2, 2 * wordSize);
2751 __ add(sp, sp, r2);
2752 __ ldp(rfp, zr, __ post(sp, 2 * wordSize));
2753
2754 #ifdef ASSERT
2755 // Compilers generate code that bang the stack by as much as the
2756 // interpreter would need. So this stack banging should never
2757 // trigger a fault. Verify that it does not on non product builds.
2758 __ ldrw(r19, Address(r5, Deoptimization::UnrollBlock::total_frame_sizes_offset()));
2759 __ bang_stack_size(r19, r2);
2760 #endif
2761 // Load address of array of frame pcs into r2
2762 __ ldr(r2, Address(r5, Deoptimization::UnrollBlock::frame_pcs_offset()));
2763
2764 // Trash the old pc
2765 // __ addptr(sp, wordSize); FIXME ????
2766
2767 // Load address of array of frame sizes into r4
2768 __ ldr(r4, Address(r5, Deoptimization::UnrollBlock::frame_sizes_offset()));
2769
2770 // Load counter into r3
2771 __ ldrw(r3, Address(r5, Deoptimization::UnrollBlock::number_of_frames_offset()));
2772
2773 // Now adjust the caller's stack to make up for the extra locals
2774 // but record the original sp so that we can save it in the skeletal interpreter
2775 // frame and the stack walking of interpreter_sender will get the unextended sp
2776 // value and not the "real" sp value.
2777
2778 const Register sender_sp = r6;
2779
2780 __ mov(sender_sp, sp);
2781 __ ldrw(r19, Address(r5,
2782 Deoptimization::UnrollBlock::
2783 caller_adjustment_offset()));
2784 __ sub(sp, sp, r19);
2785
2786 // Push interpreter frames in a loop
2787 __ mov(rscratch1, (uint64_t)0xDEADDEAD); // Make a recognizable pattern
2788 __ mov(rscratch2, rscratch1);
2789 Label loop;
2790 __ bind(loop);
2791 __ ldr(r19, Address(__ post(r4, wordSize))); // Load frame size
2792 __ sub(r19, r19, 2*wordSize); // We'll push pc and fp by hand
2793 __ ldr(lr, Address(__ post(r2, wordSize))); // Load pc
2794 __ enter(); // Save old & set new fp
2795 __ sub(sp, sp, r19); // Prolog
2796 // This value is corrected by layout_activation_impl
2797 __ str(zr, Address(rfp, frame::interpreter_frame_last_sp_offset * wordSize));
2798 __ str(sender_sp, Address(rfp, frame::interpreter_frame_sender_sp_offset * wordSize)); // Make it walkable
2799 __ mov(sender_sp, sp); // Pass sender_sp to next frame
2800 __ sub(r3, r3, 1); // Decrement counter
2801 __ cbnz(r3, loop);
2802
2803 // Re-push self-frame
2804 __ ldr(lr, Address(r2));
2805 __ enter();
2806
2807 // Allocate a full sized register save area. We subtract 2 because
2808 // enter() just pushed 2 words
2809 __ sub(sp, sp, (frame_size_in_words - 2) * wordSize);
2810
2811 // Restore frame locals after moving the frame
2812 __ strd(v0, Address(sp, reg_save.v0_offset_in_bytes()));
2813 __ str(r0, Address(sp, reg_save.r0_offset_in_bytes()));
2814
2815 // Call C code. Need thread but NOT official VM entry
2816 // crud. We cannot block on this call, no GC can happen. Call should
2817 // restore return values to their stack-slots with the new SP.
2818 //
2819 // void Deoptimization::unpack_frames(JavaThread* thread, int exec_mode)
2820
2821 // Use rfp because the frames look interpreted now
2822 // Don't need the precise return PC here, just precise enough to point into this code blob.
2823 address the_pc = __ pc();
2824 __ set_last_Java_frame(sp, rfp, the_pc, rscratch1);
2825
2826 __ mov(c_rarg0, rthread);
2827 __ movw(c_rarg1, rcpool); // second arg: exec_mode
2828 __ lea(rscratch1, RuntimeAddress(CAST_FROM_FN_PTR(address, Deoptimization::unpack_frames)));
2829 __ blr(rscratch1);
2830
2831 // Set an oopmap for the call site
2832 // Use the same PC we used for the last java frame
2833 oop_maps->add_gc_map(the_pc - start,
2834 new OopMap( frame_size_in_words, 0 ));
2835
2836 // Clear fp AND pc
2837 __ reset_last_Java_frame(true);
2838
2839 // Collect return values
2840 __ ldrd(v0, Address(sp, reg_save.v0_offset_in_bytes()));
2841 __ ldr(r0, Address(sp, reg_save.r0_offset_in_bytes()));
2842 // I think this is useless (throwing pc?)
2843 // __ ldr(r3, Address(sp, RegisterSaver::r3_offset_in_bytes()));
2844
2845 // Pop self-frame.
2846 __ leave(); // Epilog
2847
2848 // Jump to interpreter
2849 __ ret(lr);
2850
2851 // Make sure all code is generated
2852 masm->flush();
2853
2854 _deopt_blob = DeoptimizationBlob::create(&buffer, oop_maps, 0, exception_offset, reexecute_offset, frame_size_in_words);
2855 _deopt_blob->set_unpack_with_exception_in_tls_offset(exception_in_tls_offset);
2856 #if INCLUDE_JVMCI
2857 if (EnableJVMCI) {
2858 _deopt_blob->set_uncommon_trap_offset(uncommon_trap_offset);
2859 _deopt_blob->set_implicit_exception_uncommon_trap_offset(implicit_exception_uncommon_trap_offset);
2860 }
2861 #endif
2862 }
2863
2864 // Number of stack slots between incoming argument block and the start of
2865 // a new frame. The PROLOG must add this many slots to the stack. The
2866 // EPILOG must remove this many slots. aarch64 needs two slots for
2867 // return address and fp.
2868 // TODO think this is correct but check
2869 uint SharedRuntime::in_preserve_stack_slots() {
2870 return 4;
2871 }
2872
2873 uint SharedRuntime::out_preserve_stack_slots() {
2874 return 0;
2875 }
2876
2877
2878 VMReg SharedRuntime::thread_register() {
2879 return rthread->as_VMReg();
2880 }
2881
2882 //------------------------------generate_handler_blob------
2883 //
2884 // Generate a special Compile2Runtime blob that saves all registers,
2885 // and setup oopmap.
2886 //
2887 SafepointBlob* SharedRuntime::generate_handler_blob(SharedStubId id, address call_ptr) {
2888 assert(is_polling_page_id(id), "expected a polling page stub id");
2889
2890 ResourceMark rm;
2891 OopMapSet *oop_maps = new OopMapSet();
2892 OopMap* map;
2893
2894 // Allocate space for the code. Setup code generation tools.
2895 const char* name = SharedRuntime::stub_name(id);
2896 CodeBuffer buffer(name, 2048, 1024);
2897 MacroAssembler* masm = new MacroAssembler(&buffer);
2898
2899 address start = __ pc();
2900 address call_pc = nullptr;
2901 int frame_size_in_words;
2902 bool cause_return = (id == SharedStubId::polling_page_return_handler_id);
2903 RegisterSaver reg_save(id == SharedStubId::polling_page_vectors_safepoint_handler_id /* save_vectors */);
2904
2905 // When the signal occurred, the LR was either signed and stored on the stack (in which
2906 // case it will be restored from the stack before being used) or unsigned and not stored
2907 // on the stack. Stipping ensures we get the right value.
2908 __ strip_return_address();
2909
2910 // Save Integer and Float registers.
2911 map = reg_save.save_live_registers(masm, 0, &frame_size_in_words);
2912
2913 // The following is basically a call_VM. However, we need the precise
2914 // address of the call in order to generate an oopmap. Hence, we do all the
2915 // work ourselves.
2916
2917 Label retaddr;
2918 __ set_last_Java_frame(sp, noreg, retaddr, rscratch1);
2919
2920 // The return address must always be correct so that frame constructor never
2921 // sees an invalid pc.
2922
2923 if (!cause_return) {
2924 // overwrite the return address pushed by save_live_registers
2925 // Additionally, r20 is a callee-saved register so we can look at
2926 // it later to determine if someone changed the return address for
2927 // us!
2928 __ ldr(r20, Address(rthread, JavaThread::saved_exception_pc_offset()));
2929 __ protect_return_address(r20);
2930 __ str(r20, Address(rfp, wordSize));
2931 }
2932
2933 // Do the call
2934 __ mov(c_rarg0, rthread);
2935 __ lea(rscratch1, RuntimeAddress(call_ptr));
2936 __ blr(rscratch1);
2937 __ bind(retaddr);
2938
2939 // Set an oopmap for the call site. This oopmap will map all
2940 // oop-registers and debug-info registers as callee-saved. This
2941 // will allow deoptimization at this safepoint to find all possible
2942 // debug-info recordings, as well as let GC find all oops.
2943
2944 oop_maps->add_gc_map( __ pc() - start, map);
2945
2946 Label noException;
2947
2948 __ reset_last_Java_frame(false);
2949
2950 __ membar(Assembler::LoadLoad | Assembler::LoadStore);
2951
2952 __ ldr(rscratch1, Address(rthread, Thread::pending_exception_offset()));
2953 __ cbz(rscratch1, noException);
2954
2955 // Exception pending
2956
2957 reg_save.restore_live_registers(masm);
2958
2959 __ far_jump(RuntimeAddress(StubRoutines::forward_exception_entry()));
2960
2961 // No exception case
2962 __ bind(noException);
2963
2964 Label no_adjust, bail;
2965 if (!cause_return) {
2966 // If our stashed return pc was modified by the runtime we avoid touching it
2967 __ ldr(rscratch1, Address(rfp, wordSize));
2968 __ cmp(r20, rscratch1);
2969 __ br(Assembler::NE, no_adjust);
2970 __ authenticate_return_address(r20);
2971
2972 #ifdef ASSERT
2973 // Verify the correct encoding of the poll we're about to skip.
2974 // See NativeInstruction::is_ldrw_to_zr()
2975 __ ldrw(rscratch1, Address(r20));
2976 __ ubfx(rscratch2, rscratch1, 22, 10);
2977 __ cmpw(rscratch2, 0b1011100101);
2978 __ br(Assembler::NE, bail);
2979 __ ubfx(rscratch2, rscratch1, 0, 5);
2980 __ cmpw(rscratch2, 0b11111);
2981 __ br(Assembler::NE, bail);
2982 #endif
2983 // Adjust return pc forward to step over the safepoint poll instruction
2984 __ add(r20, r20, NativeInstruction::instruction_size);
2985 __ protect_return_address(r20);
2986 __ str(r20, Address(rfp, wordSize));
2987 }
2988
2989 __ bind(no_adjust);
2990 // Normal exit, restore registers and exit.
2991 reg_save.restore_live_registers(masm);
2992
2993 __ ret(lr);
2994
2995 #ifdef ASSERT
2996 __ bind(bail);
2997 __ stop("Attempting to adjust pc to skip safepoint poll but the return point is not what we expected");
2998 #endif
2999
3000 // Make sure all code is generated
3001 masm->flush();
3002
3003 // Fill-out other meta info
3004 return SafepointBlob::create(&buffer, oop_maps, frame_size_in_words);
3005 }
3006
3007 //
3008 // generate_resolve_blob - call resolution (static/virtual/opt-virtual/ic-miss
3009 //
3010 // Generate a stub that calls into vm to find out the proper destination
3011 // of a java call. All the argument registers are live at this point
3012 // but since this is generic code we don't know what they are and the caller
3013 // must do any gc of the args.
3014 //
3015 RuntimeStub* SharedRuntime::generate_resolve_blob(SharedStubId id, address destination) {
3016 assert (StubRoutines::forward_exception_entry() != nullptr, "must be generated before");
3017 assert(is_resolve_id(id), "expected a resolve stub id");
3018
3019 // allocate space for the code
3020 ResourceMark rm;
3021
3022 const char* name = SharedRuntime::stub_name(id);
3023 CodeBuffer buffer(name, 1000, 512);
3024 MacroAssembler* masm = new MacroAssembler(&buffer);
3025
3026 int frame_size_in_words;
3027 RegisterSaver reg_save(false /* save_vectors */);
3028
3029 OopMapSet *oop_maps = new OopMapSet();
3030 OopMap* map = nullptr;
3031
3032 int start = __ offset();
3033
3034 map = reg_save.save_live_registers(masm, 0, &frame_size_in_words);
3035
3036 int frame_complete = __ offset();
3037
3038 {
3039 Label retaddr;
3040 __ set_last_Java_frame(sp, noreg, retaddr, rscratch1);
3041
3042 __ mov(c_rarg0, rthread);
3043 __ lea(rscratch1, RuntimeAddress(destination));
3044
3045 __ blr(rscratch1);
3046 __ bind(retaddr);
3047 }
3048
3049 // Set an oopmap for the call site.
3050 // We need this not only for callee-saved registers, but also for volatile
3051 // registers that the compiler might be keeping live across a safepoint.
3052
3053 oop_maps->add_gc_map( __ offset() - start, map);
3054
3055 // r0 contains the address we are going to jump to assuming no exception got installed
3056
3057 // clear last_Java_sp
3058 __ reset_last_Java_frame(false);
3059 // check for pending exceptions
3060 Label pending;
3061 __ ldr(rscratch1, Address(rthread, Thread::pending_exception_offset()));
3062 __ cbnz(rscratch1, pending);
3063
3064 // get the returned Method*
3065 __ get_vm_result_2(rmethod, rthread);
3066 __ str(rmethod, Address(sp, reg_save.reg_offset_in_bytes(rmethod)));
3067
3068 // r0 is where we want to jump, overwrite rscratch1 which is saved and scratch
3069 __ str(r0, Address(sp, reg_save.rscratch1_offset_in_bytes()));
3070 reg_save.restore_live_registers(masm);
3071
3072 // We are back to the original state on entry and ready to go.
3073
3074 __ br(rscratch1);
3075
3076 // Pending exception after the safepoint
3077
3078 __ bind(pending);
3079
3080 reg_save.restore_live_registers(masm);
3081
3082 // exception pending => remove activation and forward to exception handler
3083
3084 __ str(zr, Address(rthread, JavaThread::vm_result_offset()));
3085
3086 __ ldr(r0, Address(rthread, Thread::pending_exception_offset()));
3087 __ far_jump(RuntimeAddress(StubRoutines::forward_exception_entry()));
3088
3089 // -------------
3090 // make sure all code is generated
3091 masm->flush();
3092
3093 // return the blob
3094 // frame_size_words or bytes??
3095 return RuntimeStub::new_runtime_stub(name, &buffer, frame_complete, frame_size_in_words, oop_maps, true);
3096 }
3097
3098 BufferedInlineTypeBlob* SharedRuntime::generate_buffered_inline_type_adapter(const InlineKlass* vk) {
3099 BufferBlob* buf = BufferBlob::create("inline types pack/unpack", 16 * K);
3100 CodeBuffer buffer(buf);
3101 short buffer_locs[20];
3102 buffer.insts()->initialize_shared_locs((relocInfo*)buffer_locs,
3103 sizeof(buffer_locs)/sizeof(relocInfo));
3104
3105 MacroAssembler _masm(&buffer);
3106 MacroAssembler* masm = &_masm;
3107
3108 const Array<SigEntry>* sig_vk = vk->extended_sig();
3109 const Array<VMRegPair>* regs = vk->return_regs();
3110
3111 int pack_fields_jobject_off = __ offset();
3112 // Resolve pre-allocated buffer from JNI handle.
3113 // We cannot do this in generate_call_stub() because it requires GC code to be initialized.
3114 Register Rresult = r14; // See StubGenerator::generate_call_stub().
3115 __ ldr(r0, Address(Rresult));
3116 __ resolve_jobject(r0 /* value */,
3117 rthread /* thread */,
3118 r12 /* tmp */);
3119 __ str(r0, Address(Rresult));
3120
3121 int pack_fields_off = __ offset();
3122
3123 int j = 1;
3124 for (int i = 0; i < sig_vk->length(); i++) {
3125 BasicType bt = sig_vk->at(i)._bt;
3126 if (bt == T_METADATA) {
3127 continue;
3128 }
3129 if (bt == T_VOID) {
3130 if (sig_vk->at(i-1)._bt == T_LONG ||
3131 sig_vk->at(i-1)._bt == T_DOUBLE) {
3132 j++;
3133 }
3134 continue;
3135 }
3136 int off = sig_vk->at(i)._offset;
3137 VMRegPair pair = regs->at(j);
3138 VMReg r_1 = pair.first();
3139 VMReg r_2 = pair.second();
3140 Address to(r0, off);
3141 if (bt == T_FLOAT) {
3142 __ strs(r_1->as_FloatRegister(), to);
3143 } else if (bt == T_DOUBLE) {
3144 __ strd(r_1->as_FloatRegister(), to);
3145 } else {
3146 Register val = r_1->as_Register();
3147 assert_different_registers(to.base(), val, r15, r16, r17);
3148 if (is_reference_type(bt)) {
3149 __ store_heap_oop(to, val, r15, r16, r17, IN_HEAP | ACCESS_WRITE | IS_DEST_UNINITIALIZED);
3150 } else {
3151 __ store_sized_value(to, r_1->as_Register(), type2aelembytes(bt));
3152 }
3153 }
3154 j++;
3155 }
3156 assert(j == regs->length(), "missed a field?");
3157 if (vk->has_nullable_atomic_layout()) {
3158 // Zero the null marker (setting it to 1 would be better but would require an additional register)
3159 __ strb(zr, Address(r0, vk->null_marker_offset()));
3160 }
3161 __ ret(lr);
3162
3163 int unpack_fields_off = __ offset();
3164
3165 Label skip;
3166 __ cbz(r0, skip);
3167
3168 j = 1;
3169 for (int i = 0; i < sig_vk->length(); i++) {
3170 BasicType bt = sig_vk->at(i)._bt;
3171 if (bt == T_METADATA) {
3172 continue;
3173 }
3174 if (bt == T_VOID) {
3175 if (sig_vk->at(i-1)._bt == T_LONG ||
3176 sig_vk->at(i-1)._bt == T_DOUBLE) {
3177 j++;
3178 }
3179 continue;
3180 }
3181 int off = sig_vk->at(i)._offset;
3182 assert(off > 0, "offset in object should be positive");
3183 VMRegPair pair = regs->at(j);
3184 VMReg r_1 = pair.first();
3185 VMReg r_2 = pair.second();
3186 Address from(r0, off);
3187 if (bt == T_FLOAT) {
3188 __ ldrs(r_1->as_FloatRegister(), from);
3189 } else if (bt == T_DOUBLE) {
3190 __ ldrd(r_1->as_FloatRegister(), from);
3191 } else if (bt == T_OBJECT || bt == T_ARRAY) {
3192 assert_different_registers(r0, r_1->as_Register());
3193 __ load_heap_oop(r_1->as_Register(), from, rscratch1, rscratch2);
3194 } else {
3195 assert(is_java_primitive(bt), "unexpected basic type");
3196 assert_different_registers(r0, r_1->as_Register());
3197
3198 size_t size_in_bytes = type2aelembytes(bt);
3199 __ load_sized_value(r_1->as_Register(), from, size_in_bytes, bt != T_CHAR && bt != T_BOOLEAN);
3200 }
3201 j++;
3202 }
3203 assert(j == regs->length(), "missed a field?");
3204
3205 __ bind(skip);
3206
3207 __ ret(lr);
3208
3209 __ flush();
3210
3211 return BufferedInlineTypeBlob::create(&buffer, pack_fields_off, pack_fields_jobject_off, unpack_fields_off);
3212 }
3213
3214 // Continuation point for throwing of implicit exceptions that are
3215 // not handled in the current activation. Fabricates an exception
3216 // oop and initiates normal exception dispatching in this
3217 // frame. Since we need to preserve callee-saved values (currently
3218 // only for C2, but done for C1 as well) we need a callee-saved oop
3219 // map and therefore have to make these stubs into RuntimeStubs
3220 // rather than BufferBlobs. If the compiler needs all registers to
3221 // be preserved between the fault point and the exception handler
3222 // then it must assume responsibility for that in
3223 // AbstractCompiler::continuation_for_implicit_null_exception or
3224 // continuation_for_implicit_division_by_zero_exception. All other
3225 // implicit exceptions (e.g., NullPointerException or
3226 // AbstractMethodError on entry) are either at call sites or
3227 // otherwise assume that stack unwinding will be initiated, so
3228 // caller saved registers were assumed volatile in the compiler.
3229
3230 RuntimeStub* SharedRuntime::generate_throw_exception(SharedStubId id, address runtime_entry) {
3231 assert(is_throw_id(id), "expected a throw stub id");
3232
3233 const char* name = SharedRuntime::stub_name(id);
3234
3235 // Information about frame layout at time of blocking runtime call.
3236 // Note that we only have to preserve callee-saved registers since
3237 // the compilers are responsible for supplying a continuation point
3238 // if they expect all registers to be preserved.
3239 // n.b. aarch64 asserts that frame::arg_reg_save_area_bytes == 0
3240 enum layout {
3241 rfp_off = 0,
3242 rfp_off2,
3243 return_off,
3244 return_off2,
3245 framesize // inclusive of return address
3246 };
3247
3248 int insts_size = 512;
3249 int locs_size = 64;
3250
3251 ResourceMark rm;
3252 const char* timer_msg = "SharedRuntime generate_throw_exception";
3253 TraceTime timer(timer_msg, TRACETIME_LOG(Info, startuptime));
3254
3255 CodeBuffer code(name, insts_size, locs_size);
3256 OopMapSet* oop_maps = new OopMapSet();
3257 MacroAssembler* masm = new MacroAssembler(&code);
3258
3259 address start = __ pc();
3260
3261 // This is an inlined and slightly modified version of call_VM
3262 // which has the ability to fetch the return PC out of
3263 // thread-local storage and also sets up last_Java_sp slightly
3264 // differently than the real call_VM
3265
3266 __ enter(); // Save FP and LR before call
3267
3268 assert(is_even(framesize/2), "sp not 16-byte aligned");
3269
3270 // lr and fp are already in place
3271 __ sub(sp, rfp, ((uint64_t)framesize-4) << LogBytesPerInt); // prolog
3272
3273 int frame_complete = __ pc() - start;
3274
3275 // Set up last_Java_sp and last_Java_fp
3276 address the_pc = __ pc();
3277 __ set_last_Java_frame(sp, rfp, the_pc, rscratch1);
3278
3279 __ mov(c_rarg0, rthread);
3280 BLOCK_COMMENT("call runtime_entry");
3281 __ mov(rscratch1, runtime_entry);
3282 __ blr(rscratch1);
3283
3284 // Generate oop map
3285 OopMap* map = new OopMap(framesize, 0);
3286
3287 oop_maps->add_gc_map(the_pc - start, map);
3288
3289 __ reset_last_Java_frame(true);
3290
3291 // Reinitialize the ptrue predicate register, in case the external runtime
3292 // call clobbers ptrue reg, as we may return to SVE compiled code.
3293 __ reinitialize_ptrue();
3294
3295 __ leave();
3296
3297 // check for pending exceptions
3298 #ifdef ASSERT
3299 Label L;
3300 __ ldr(rscratch1, Address(rthread, Thread::pending_exception_offset()));
3301 __ cbnz(rscratch1, L);
3302 __ should_not_reach_here();
3303 __ bind(L);
3304 #endif // ASSERT
3305 __ far_jump(RuntimeAddress(StubRoutines::forward_exception_entry()));
3306
3307 // codeBlob framesize is in words (not VMRegImpl::slot_size)
3308 RuntimeStub* stub =
3309 RuntimeStub::new_runtime_stub(name,
3310 &code,
3311 frame_complete,
3312 (framesize >> (LogBytesPerWord - LogBytesPerInt)),
3313 oop_maps, false);
3314 return stub;
3315 }
3316
3317 #if INCLUDE_JFR
3318
3319 static void jfr_prologue(address the_pc, MacroAssembler* masm, Register thread) {
3320 __ set_last_Java_frame(sp, rfp, the_pc, rscratch1);
3321 __ mov(c_rarg0, thread);
3322 }
3323
3324 // The handle is dereferenced through a load barrier.
3325 static void jfr_epilogue(MacroAssembler* masm) {
3326 __ reset_last_Java_frame(true);
3327 }
3328
3329 // For c2: c_rarg0 is junk, call to runtime to write a checkpoint.
3330 // It returns a jobject handle to the event writer.
3331 // The handle is dereferenced and the return value is the event writer oop.
3332 RuntimeStub* SharedRuntime::generate_jfr_write_checkpoint() {
3333 enum layout {
3334 rbp_off,
3335 rbpH_off,
3336 return_off,
3337 return_off2,
3338 framesize // inclusive of return address
3339 };
3340
3341 int insts_size = 1024;
3342 int locs_size = 64;
3343 const char* name = SharedRuntime::stub_name(SharedStubId::jfr_write_checkpoint_id);
3344 CodeBuffer code(name, insts_size, locs_size);
3345 OopMapSet* oop_maps = new OopMapSet();
3346 MacroAssembler* masm = new MacroAssembler(&code);
3347
3348 address start = __ pc();
3349 __ enter();
3350 int frame_complete = __ pc() - start;
3351 address the_pc = __ pc();
3352 jfr_prologue(the_pc, masm, rthread);
3353 __ call_VM_leaf(CAST_FROM_FN_PTR(address, JfrIntrinsicSupport::write_checkpoint), 1);
3354 jfr_epilogue(masm);
3355 __ resolve_global_jobject(r0, rscratch1, rscratch2);
3356 __ leave();
3357 __ ret(lr);
3358
3359 OopMap* map = new OopMap(framesize, 1); // rfp
3360 oop_maps->add_gc_map(the_pc - start, map);
3361
3362 RuntimeStub* stub = // codeBlob framesize is in words (not VMRegImpl::slot_size)
3363 RuntimeStub::new_runtime_stub(name, &code, frame_complete,
3364 (framesize >> (LogBytesPerWord - LogBytesPerInt)),
3365 oop_maps, false);
3366 return stub;
3367 }
3368
3369 // For c2: call to return a leased buffer.
3370 RuntimeStub* SharedRuntime::generate_jfr_return_lease() {
3371 enum layout {
3372 rbp_off,
3373 rbpH_off,
3374 return_off,
3375 return_off2,
3376 framesize // inclusive of return address
3377 };
3378
3379 int insts_size = 1024;
3380 int locs_size = 64;
3381
3382 const char* name = SharedRuntime::stub_name(SharedStubId::jfr_return_lease_id);
3383 CodeBuffer code(name, insts_size, locs_size);
3384 OopMapSet* oop_maps = new OopMapSet();
3385 MacroAssembler* masm = new MacroAssembler(&code);
3386
3387 address start = __ pc();
3388 __ enter();
3389 int frame_complete = __ pc() - start;
3390 address the_pc = __ pc();
3391 jfr_prologue(the_pc, masm, rthread);
3392 __ call_VM_leaf(CAST_FROM_FN_PTR(address, JfrIntrinsicSupport::return_lease), 1);
3393 jfr_epilogue(masm);
3394
3395 __ leave();
3396 __ ret(lr);
3397
3398 OopMap* map = new OopMap(framesize, 1); // rfp
3399 oop_maps->add_gc_map(the_pc - start, map);
3400
3401 RuntimeStub* stub = // codeBlob framesize is in words (not VMRegImpl::slot_size)
3402 RuntimeStub::new_runtime_stub(name, &code, frame_complete,
3403 (framesize >> (LogBytesPerWord - LogBytesPerInt)),
3404 oop_maps, false);
3405 return stub;
3406 }
3407
3408 #endif // INCLUDE_JFR