1 /*
2 * Copyright (c) 2016, 2024, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2016, 2024 SAP SE. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 // Major contributions by AHa, AS, JL, ML.
27
28 #include "precompiled.hpp"
29 #include "asm/macroAssembler.inline.hpp"
30 #include "gc/shared/barrierSet.hpp"
31 #include "gc/shared/barrierSetAssembler.hpp"
32 #include "interp_masm_s390.hpp"
33 #include "interpreter/interpreter.hpp"
34 #include "interpreter/interpreterRuntime.hpp"
35 #include "oops/arrayOop.hpp"
36 #include "oops/markWord.hpp"
37 #include "oops/methodCounters.hpp"
38 #include "oops/methodData.hpp"
39 #include "oops/resolvedFieldEntry.hpp"
40 #include "oops/resolvedIndyEntry.hpp"
41 #include "oops/resolvedMethodEntry.hpp"
42 #include "prims/jvmtiExport.hpp"
43 #include "prims/jvmtiThreadState.hpp"
44 #include "runtime/basicLock.hpp"
45 #include "runtime/frame.inline.hpp"
46 #include "runtime/javaThread.hpp"
47 #include "runtime/safepointMechanism.hpp"
48 #include "runtime/sharedRuntime.hpp"
49 #include "utilities/macros.hpp"
50 #include "utilities/powerOfTwo.hpp"
51
52 // Implementation of InterpreterMacroAssembler.
53 // This file specializes the assembler with interpreter-specific macros.
54
55 #ifdef PRODUCT
56 #define BLOCK_COMMENT(str)
57 #define BIND(label) bind(label);
58 #else
59 #define BLOCK_COMMENT(str) block_comment(str)
60 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":")
61 #endif
62
63 void InterpreterMacroAssembler::jump_to_entry(address entry, Register Rscratch) {
64 assert(entry != nullptr, "Entry must have been generated by now");
65 assert(Rscratch != Z_R0, "Can't use R0 for addressing");
66 branch_optimized(Assembler::bcondAlways, entry);
67 }
68
69 void InterpreterMacroAssembler::empty_expression_stack(void) {
70 get_monitors(Z_R1_scratch);
71 add2reg(Z_esp, -Interpreter::stackElementSize, Z_R1_scratch);
72 }
73
74 // Dispatch code executed in the prolog of a bytecode which does not do it's
75 // own dispatch.
76 void InterpreterMacroAssembler::dispatch_prolog(TosState state, int bcp_incr) {
77 // On z/Architecture we are short on registers, therefore we do not preload the
78 // dispatch address of the next bytecode.
79 }
80
81 // Dispatch code executed in the epilog of a bytecode which does not do it's
82 // own dispatch.
83 void InterpreterMacroAssembler::dispatch_epilog(TosState state, int step) {
84 dispatch_next(state, step);
85 }
86
87 void InterpreterMacroAssembler::dispatch_next(TosState state, int bcp_incr, bool generate_poll) {
88 z_llgc(Z_bytecode, bcp_incr, Z_R0, Z_bcp); // Load next bytecode.
89 add2reg(Z_bcp, bcp_incr); // Advance bcp. Add2reg produces optimal code.
90 dispatch_base(state, Interpreter::dispatch_table(state), generate_poll);
91 }
92
93 // Common code to dispatch and dispatch_only.
94 // Dispatch value in Lbyte_code and increment Lbcp.
95
96 void InterpreterMacroAssembler::dispatch_base(TosState state, address* table, bool generate_poll) {
97 verify_FPU(1, state);
98
99 #ifdef ASSERT
100 address reentry = nullptr;
101 { Label OK;
102 // Check if the frame pointer in Z_fp is correct.
103 z_cg(Z_fp, 0, Z_SP);
104 z_bre(OK);
105 reentry = stop_chain_static(reentry, "invalid frame pointer Z_fp: " FILE_AND_LINE);
106 bind(OK);
107 }
108 { Label OK;
109 // check if the locals pointer in Z_locals is correct
110 z_cg(Z_locals, _z_ijava_state_neg(locals), Z_fp);
111 z_bre(OK);
112 reentry = stop_chain_static(reentry, "invalid locals pointer Z_locals: " FILE_AND_LINE);
113 bind(OK);
114 }
115 #endif
116
117 // TODO: Maybe implement +VerifyActivationFrameSize here.
118 verify_oop(Z_tos, state);
119
120 // Dispatch table to use.
121 load_absolute_address(Z_tmp_1, (address)table); // Z_tmp_1 = table;
122
123 if (generate_poll) {
124 address *sfpt_tbl = Interpreter::safept_table(state);
125 if (table != sfpt_tbl) {
126 Label dispatch;
127 const Address poll_byte_addr(Z_thread, in_bytes(JavaThread::polling_word_offset()) + 7 /* Big Endian */);
128 // Armed page has poll_bit set, if poll bit is cleared just continue.
129 z_tm(poll_byte_addr, SafepointMechanism::poll_bit());
130 z_braz(dispatch);
131 load_absolute_address(Z_tmp_1, (address)sfpt_tbl); // Z_tmp_1 = table;
132 bind(dispatch);
133 }
134 }
135
136 // 0 <= Z_bytecode < 256 => Use a 32 bit shift, because it is shorter than sllg.
137 // Z_bytecode must have been loaded zero-extended for this approach to be correct.
138 z_sll(Z_bytecode, LogBytesPerWord, Z_R0); // Multiply by wordSize.
139 z_lg(Z_tmp_1, 0, Z_bytecode, Z_tmp_1); // Get entry addr.
140
141 z_br(Z_tmp_1);
142 }
143
144 void InterpreterMacroAssembler::dispatch_only(TosState state, bool generate_poll) {
145 dispatch_base(state, Interpreter::dispatch_table(state), generate_poll);
146 }
147
148 void InterpreterMacroAssembler::dispatch_only_normal(TosState state) {
149 dispatch_base(state, Interpreter::normal_table(state));
150 }
151
152 void InterpreterMacroAssembler::dispatch_via(TosState state, address *table) {
153 // Load current bytecode.
154 z_llgc(Z_bytecode, Address(Z_bcp, (intptr_t)0));
155 dispatch_base(state, table);
156 }
157
158 // The following call_VM*_base() methods overload and mask the respective
159 // declarations/definitions in class MacroAssembler. They are meant as a "detour"
160 // to perform additional, template interpreter specific tasks before actually
161 // calling their MacroAssembler counterparts.
162
163 void InterpreterMacroAssembler::call_VM_leaf_base(address entry_point) {
164 bool allow_relocation = true; // Fenerally valid variant. Assume code is relocated.
165 // interpreter specific
166 // Note: No need to save/restore bcp (Z_R13) pointer since these are callee
167 // saved registers and no blocking/ GC can happen in leaf calls.
168
169 // super call
170 MacroAssembler::call_VM_leaf_base(entry_point, allow_relocation);
171 }
172
173 void InterpreterMacroAssembler::call_VM_leaf_base(address entry_point, bool allow_relocation) {
174 // interpreter specific
175 // Note: No need to save/restore bcp (Z_R13) pointer since these are callee
176 // saved registers and no blocking/ GC can happen in leaf calls.
177
178 // super call
179 MacroAssembler::call_VM_leaf_base(entry_point, allow_relocation);
180 }
181
182 void InterpreterMacroAssembler::call_VM_base(Register oop_result, Register last_java_sp,
183 address entry_point, bool check_exceptions) {
184 bool allow_relocation = true; // Fenerally valid variant. Assume code is relocated.
185 // interpreter specific
186
187 save_bcp();
188 save_esp();
189 // super call
190 MacroAssembler::call_VM_base(oop_result, last_java_sp,
191 entry_point, allow_relocation, check_exceptions);
192 restore_bcp();
193 }
194
195 void InterpreterMacroAssembler::call_VM_base(Register oop_result, Register last_java_sp,
196 address entry_point, bool allow_relocation,
197 bool check_exceptions) {
198 // interpreter specific
199
200 save_bcp();
201 save_esp();
202 // super call
203 MacroAssembler::call_VM_base(oop_result, last_java_sp,
204 entry_point, allow_relocation, check_exceptions);
205 restore_bcp();
206 }
207
208 void InterpreterMacroAssembler::check_and_handle_popframe(Register scratch_reg) {
209 if (JvmtiExport::can_pop_frame()) {
210 BLOCK_COMMENT("check_and_handle_popframe {");
211 Label L;
212 // Initiate popframe handling only if it is not already being
213 // processed. If the flag has the popframe_processing bit set, it
214 // means that this code is called *during* popframe handling - we
215 // don't want to reenter.
216 // TODO: Check if all four state combinations could be visible.
217 // If (processing and !pending) is an invisible/impossible state,
218 // there is optimization potential by testing both bits at once.
219 // Then, All_Zeroes and All_Ones means skip, Mixed means doit.
220 testbit(Address(Z_thread, JavaThread::popframe_condition_offset()),
221 exact_log2(JavaThread::popframe_pending_bit));
222 z_bfalse(L);
223 testbit(Address(Z_thread, JavaThread::popframe_condition_offset()),
224 exact_log2(JavaThread::popframe_processing_bit));
225 z_btrue(L);
226
227 // Call Interpreter::remove_activation_preserving_args_entry() to get the
228 // address of the same-named entrypoint in the generated interpreter code.
229 call_VM_leaf(CAST_FROM_FN_PTR(address, Interpreter::remove_activation_preserving_args_entry));
230 // The above call should (as its only effect) return the contents of the field
231 // _remove_activation_preserving_args_entry in Z_RET.
232 // We just jump there to have the work done.
233 z_br(Z_RET);
234 // There is no way for control to fall thru here.
235
236 bind(L);
237 BLOCK_COMMENT("} check_and_handle_popframe");
238 }
239 }
240
241
242 void InterpreterMacroAssembler::load_earlyret_value(TosState state) {
243 Register RjvmtiState = Z_R1_scratch;
244 int tos_off = in_bytes(JvmtiThreadState::earlyret_tos_offset());
245 int oop_off = in_bytes(JvmtiThreadState::earlyret_oop_offset());
246 int val_off = in_bytes(JvmtiThreadState::earlyret_value_offset());
247 int state_off = in_bytes(JavaThread::jvmti_thread_state_offset());
248
249 z_lg(RjvmtiState, state_off, Z_thread);
250
251 switch (state) {
252 case atos: z_lg(Z_tos, oop_off, RjvmtiState);
253 store_const(Address(RjvmtiState, oop_off), 0L, 8, 8, Z_R0_scratch);
254 break;
255 case ltos: z_lg(Z_tos, val_off, RjvmtiState); break;
256 case btos: // fall through
257 case ztos: // fall through
258 case ctos: // fall through
259 case stos: // fall through
260 case itos: z_llgf(Z_tos, val_off, RjvmtiState); break;
261 case ftos: z_le(Z_ftos, val_off, RjvmtiState); break;
262 case dtos: z_ld(Z_ftos, val_off, RjvmtiState); break;
263 case vtos: /* nothing to do */ break;
264 default : ShouldNotReachHere();
265 }
266
267 // Clean up tos value in the jvmti thread state.
268 store_const(Address(RjvmtiState, val_off), 0L, 8, 8, Z_R0_scratch);
269 // Set tos state field to illegal value.
270 store_const(Address(RjvmtiState, tos_off), ilgl, 4, 1, Z_R0_scratch);
271 }
272
273 void InterpreterMacroAssembler::check_and_handle_earlyret(Register scratch_reg) {
274 if (JvmtiExport::can_force_early_return()) {
275 BLOCK_COMMENT("check_and_handle_earlyret {");
276 Label L;
277 // arg regs are save, because we are just behind the call in call_VM_base
278 Register jvmti_thread_state = Z_ARG2;
279 Register tmp = Z_ARG3;
280 load_and_test_long(jvmti_thread_state, Address(Z_thread, JavaThread::jvmti_thread_state_offset()));
281 z_bre(L); // if (thread->jvmti_thread_state() == nullptr) exit;
282
283 // Initiate earlyret handling only if it is not already being processed.
284 // If the flag has the earlyret_processing bit set, it means that this code
285 // is called *during* earlyret handling - we don't want to reenter.
286
287 assert((JvmtiThreadState::earlyret_pending != 0) && (JvmtiThreadState::earlyret_inactive == 0),
288 "must fix this check, when changing the values of the earlyret enum");
289 assert(JvmtiThreadState::earlyret_pending == 1, "must fix this check, when changing the values of the earlyret enum");
290
291 load_and_test_int(tmp, Address(jvmti_thread_state, JvmtiThreadState::earlyret_state_offset()));
292 z_brz(L); // if (thread->jvmti_thread_state()->_earlyret_state != JvmtiThreadState::earlyret_pending) exit;
293
294 // Call Interpreter::remove_activation_early_entry() to get the address of the
295 // same-named entrypoint in the generated interpreter code.
296 assert(sizeof(TosState) == 4, "unexpected size");
297 z_l(Z_ARG1, Address(jvmti_thread_state, JvmtiThreadState::earlyret_tos_offset()));
298 call_VM_leaf(CAST_FROM_FN_PTR(address, Interpreter::remove_activation_early_entry), Z_ARG1);
299 // The above call should (as its only effect) return the contents of the field
300 // _remove_activation_preserving_args_entry in Z_RET.
301 // We just jump there to have the work done.
302 z_br(Z_RET);
303 // There is no way for control to fall thru here.
304
305 bind(L);
306 BLOCK_COMMENT("} check_and_handle_earlyret");
307 }
308 }
309
310 void InterpreterMacroAssembler::super_call_VM_leaf(address entry_point, Register arg_1, Register arg_2) {
311 lgr_if_needed(Z_ARG1, arg_1);
312 assert(arg_2 != Z_ARG1, "smashed argument");
313 lgr_if_needed(Z_ARG2, arg_2);
314 MacroAssembler::call_VM_leaf_base(entry_point, true);
315 }
316
317 void InterpreterMacroAssembler::get_cache_index_at_bcp(Register index, int bcp_offset, size_t index_size) {
318 Address param(Z_bcp, bcp_offset);
319
320 BLOCK_COMMENT("get_cache_index_at_bcp {");
321 assert(bcp_offset > 0, "bcp is still pointing to start of bytecode");
322 if (index_size == sizeof(u2)) {
323 load_sized_value(index, param, 2, false /*signed*/);
324 } else if (index_size == sizeof(u4)) {
325
326 load_sized_value(index, param, 4, false);
327 } else if (index_size == sizeof(u1)) {
328 z_llgc(index, param);
329 } else {
330 ShouldNotReachHere();
331 }
332 BLOCK_COMMENT("}");
333 }
334
335 void InterpreterMacroAssembler::load_resolved_indy_entry(Register cache, Register index) {
336 // Get index out of bytecode pointer.
337 get_cache_index_at_bcp(index, 1, sizeof(u4));
338
339 // Get the address of the ResolvedIndyEntry array
340 get_constant_pool_cache(cache);
341 z_lg(cache, Address(cache, in_bytes(ConstantPoolCache::invokedynamic_entries_offset())));
342
343 // Scale the index to form a byte offset into the ResolvedIndyEntry array
344 size_t entry_size = sizeof(ResolvedIndyEntry);
345 if (is_power_of_2(entry_size)) {
346 z_sllg(index, index, exact_log2(entry_size));
347 } else {
348 z_mghi(index, entry_size);
349 }
350
351 // Calculate the final field address.
352 z_la(cache, Array<ResolvedIndyEntry>::base_offset_in_bytes(), index, cache);
353 }
354
355 void InterpreterMacroAssembler::load_field_entry(Register cache, Register index, int bcp_offset) {
356 // Get field index out of bytecode pointer.
357 get_cache_index_at_bcp(index, bcp_offset, sizeof(u2));
358
359 // Get the address of the ResolvedFieldEntry array.
360 get_constant_pool_cache(cache);
361 z_lg(cache, Address(cache, in_bytes(ConstantPoolCache::field_entries_offset())));
362
363 // Scale the index to form a byte offset into the ResolvedFieldEntry array
364 size_t entry_size = sizeof(ResolvedFieldEntry);
365 if (is_power_of_2(entry_size)) {
366 z_sllg(index, index, exact_log2(entry_size));
367 } else {
368 z_mghi(index, entry_size);
369 }
370
371 // Calculate the final field address.
372 z_la(cache, Array<ResolvedFieldEntry>::base_offset_in_bytes(), index, cache);
373 }
374
375 void InterpreterMacroAssembler::load_method_entry(Register cache, Register index, int bcp_offset) {
376 // Get field index out of bytecode pointer.
377 get_cache_index_at_bcp(index, bcp_offset, sizeof(u2));
378
379 // Get the address of the ResolvedMethodEntry array.
380 get_constant_pool_cache(cache);
381 z_lg(cache, Address(cache, in_bytes(ConstantPoolCache::method_entries_offset())));
382
383 // Scale the index to form a byte offset into the ResolvedMethodEntry array
384 size_t entry_size = sizeof(ResolvedMethodEntry);
385 if (is_power_of_2(entry_size)) {
386 z_sllg(index, index, exact_log2(entry_size));
387 } else {
388 z_mghi(index, entry_size);
389 }
390
391 // Calculate the final field address.
392 z_la(cache, Array<ResolvedMethodEntry>::base_offset_in_bytes(), index, cache);
393 }
394
395 // Load object from cpool->resolved_references(index).
396 void InterpreterMacroAssembler::load_resolved_reference_at_index(Register result, Register index) {
397 assert_different_registers(result, index);
398 get_constant_pool(result);
399
400 // Convert
401 // - from field index to resolved_references() index and
402 // - from word index to byte offset.
403 // Since this is a java object, it is potentially compressed.
404 Register tmp = index; // reuse
405 z_sllg(index, index, LogBytesPerHeapOop); // Offset into resolved references array.
406 // Load pointer for resolved_references[] objArray.
407 z_lg(result, in_bytes(ConstantPool::cache_offset()), result);
408 z_lg(result, in_bytes(ConstantPoolCache::resolved_references_offset()), result);
409 resolve_oop_handle(result); // Load resolved references array itself.
410 #ifdef ASSERT
411 NearLabel index_ok;
412 z_lgf(Z_R0, Address(result, arrayOopDesc::length_offset_in_bytes()));
413 z_sllg(Z_R0, Z_R0, LogBytesPerHeapOop);
414 compare64_and_branch(tmp, Z_R0, Assembler::bcondLow, index_ok);
415 stop("resolved reference index out of bounds", 0x09256);
416 bind(index_ok);
417 #endif
418 z_agr(result, index); // Address of indexed array element.
419 load_heap_oop(result, Address(result, arrayOopDesc::base_offset_in_bytes(T_OBJECT)), tmp, noreg);
420 }
421
422 // load cpool->resolved_klass_at(index)
423 void InterpreterMacroAssembler::load_resolved_klass_at_offset(Register cpool, Register offset, Register iklass) {
424 // int value = *(Rcpool->int_at_addr(which));
425 // int resolved_klass_index = extract_low_short_from_int(value);
426 z_llgh(offset, Address(cpool, offset, sizeof(ConstantPool) + 2)); // offset = resolved_klass_index (s390 is big-endian)
427 z_sllg(offset, offset, LogBytesPerWord); // Convert 'index' to 'offset'
428 z_lg(iklass, Address(cpool, ConstantPool::resolved_klasses_offset())); // iklass = cpool->_resolved_klasses
429 z_lg(iklass, Address(iklass, offset, Array<Klass*>::base_offset_in_bytes()));
430 }
431
432 // Generate a subtype check: branch to ok_is_subtype if sub_klass is
433 // a subtype of super_klass. Blows registers Rsuper_klass, Rsub_klass, tmp1, tmp2.
434 void InterpreterMacroAssembler::gen_subtype_check(Register Rsub_klass,
435 Register Rsuper_klass,
436 Register Rtmp1,
437 Register Rtmp2,
438 Label &ok_is_subtype) {
439 // Profile the not-null value's klass.
440 profile_typecheck(Rtmp1, Rsub_klass, Rtmp2);
441
442 // Do the check.
443 check_klass_subtype(Rsub_klass, Rsuper_klass, Rtmp1, Rtmp2, ok_is_subtype);
444 }
445
446 // Pop topmost element from stack. It just disappears.
447 // Useful if consumed previously by access via stackTop().
448 void InterpreterMacroAssembler::popx(int len) {
449 add2reg(Z_esp, len*Interpreter::stackElementSize);
450 debug_only(verify_esp(Z_esp, Z_R1_scratch));
451 }
452
453 // Get Address object of stack top. No checks. No pop.
454 // Purpose: - Provide address of stack operand to exploit reg-mem operations.
455 // - Avoid RISC-like mem2reg - reg-reg-op sequence.
456 Address InterpreterMacroAssembler::stackTop() {
457 return Address(Z_esp, Interpreter::expr_offset_in_bytes(0));
458 }
459
460 void InterpreterMacroAssembler::pop_i(Register r) {
461 z_l(r, Interpreter::expr_offset_in_bytes(0), Z_esp);
462 add2reg(Z_esp, Interpreter::stackElementSize);
463 assert_different_registers(r, Z_R1_scratch);
464 debug_only(verify_esp(Z_esp, Z_R1_scratch));
465 }
466
467 void InterpreterMacroAssembler::pop_ptr(Register r) {
468 z_lg(r, Interpreter::expr_offset_in_bytes(0), Z_esp);
469 add2reg(Z_esp, Interpreter::stackElementSize);
470 assert_different_registers(r, Z_R1_scratch);
471 debug_only(verify_esp(Z_esp, Z_R1_scratch));
472 }
473
474 void InterpreterMacroAssembler::pop_l(Register r) {
475 z_lg(r, Interpreter::expr_offset_in_bytes(0), Z_esp);
476 add2reg(Z_esp, 2*Interpreter::stackElementSize);
477 assert_different_registers(r, Z_R1_scratch);
478 debug_only(verify_esp(Z_esp, Z_R1_scratch));
479 }
480
481 void InterpreterMacroAssembler::pop_f(FloatRegister f) {
482 mem2freg_opt(f, Address(Z_esp, Interpreter::expr_offset_in_bytes(0)), false);
483 add2reg(Z_esp, Interpreter::stackElementSize);
484 debug_only(verify_esp(Z_esp, Z_R1_scratch));
485 }
486
487 void InterpreterMacroAssembler::pop_d(FloatRegister f) {
488 mem2freg_opt(f, Address(Z_esp, Interpreter::expr_offset_in_bytes(0)), true);
489 add2reg(Z_esp, 2*Interpreter::stackElementSize);
490 debug_only(verify_esp(Z_esp, Z_R1_scratch));
491 }
492
493 void InterpreterMacroAssembler::push_i(Register r) {
494 assert_different_registers(r, Z_R1_scratch);
495 debug_only(verify_esp(Z_esp, Z_R1_scratch));
496 z_st(r, Address(Z_esp));
497 add2reg(Z_esp, -Interpreter::stackElementSize);
498 }
499
500 void InterpreterMacroAssembler::push_ptr(Register r) {
501 z_stg(r, Address(Z_esp));
502 add2reg(Z_esp, -Interpreter::stackElementSize);
503 }
504
505 void InterpreterMacroAssembler::push_l(Register r) {
506 assert_different_registers(r, Z_R1_scratch);
507 debug_only(verify_esp(Z_esp, Z_R1_scratch));
508 int offset = -Interpreter::stackElementSize;
509 z_stg(r, Address(Z_esp, offset));
510 clear_mem(Address(Z_esp), Interpreter::stackElementSize);
511 add2reg(Z_esp, 2 * offset);
512 }
513
514 void InterpreterMacroAssembler::push_f(FloatRegister f) {
515 debug_only(verify_esp(Z_esp, Z_R1_scratch));
516 freg2mem_opt(f, Address(Z_esp), false);
517 add2reg(Z_esp, -Interpreter::stackElementSize);
518 }
519
520 void InterpreterMacroAssembler::push_d(FloatRegister d) {
521 debug_only(verify_esp(Z_esp, Z_R1_scratch));
522 int offset = -Interpreter::stackElementSize;
523 freg2mem_opt(d, Address(Z_esp, offset));
524 add2reg(Z_esp, 2 * offset);
525 }
526
527 void InterpreterMacroAssembler::push(TosState state) {
528 verify_oop(Z_tos, state);
529 switch (state) {
530 case atos: push_ptr(); break;
531 case btos: push_i(); break;
532 case ztos:
533 case ctos:
534 case stos: push_i(); break;
535 case itos: push_i(); break;
536 case ltos: push_l(); break;
537 case ftos: push_f(); break;
538 case dtos: push_d(); break;
539 case vtos: /* nothing to do */ break;
540 default : ShouldNotReachHere();
541 }
542 }
543
544 void InterpreterMacroAssembler::pop(TosState state) {
545 switch (state) {
546 case atos: pop_ptr(Z_tos); break;
547 case btos: pop_i(Z_tos); break;
548 case ztos:
549 case ctos:
550 case stos: pop_i(Z_tos); break;
551 case itos: pop_i(Z_tos); break;
552 case ltos: pop_l(Z_tos); break;
553 case ftos: pop_f(Z_ftos); break;
554 case dtos: pop_d(Z_ftos); break;
555 case vtos: /* nothing to do */ break;
556 default : ShouldNotReachHere();
557 }
558 verify_oop(Z_tos, state);
559 }
560
561 // Helpers for swap and dup.
562 void InterpreterMacroAssembler::load_ptr(int n, Register val) {
563 z_lg(val, Address(Z_esp, Interpreter::expr_offset_in_bytes(n)));
564 }
565
566 void InterpreterMacroAssembler::store_ptr(int n, Register val) {
567 z_stg(val, Address(Z_esp, Interpreter::expr_offset_in_bytes(n)));
568 }
569
570 void InterpreterMacroAssembler::prepare_to_jump_from_interpreted(Register method) {
571 // Satisfy interpreter calling convention (see generate_normal_entry()).
572 z_lgr(Z_R10, Z_SP); // Set sender sp (aka initial caller sp, aka unextended sp).
573 // Record top_frame_sp, because the callee might modify it, if it's compiled.
574 z_stg(Z_SP, _z_ijava_state_neg(top_frame_sp), Z_fp);
575 save_bcp();
576 save_esp();
577 z_lgr(Z_method, method); // Set Z_method (kills Z_fp!).
578 }
579
580 // Jump to from_interpreted entry of a call unless single stepping is possible
581 // in this thread in which case we must call the i2i entry.
582 void InterpreterMacroAssembler::jump_from_interpreted(Register method, Register temp) {
583 assert_different_registers(method, Z_R10 /*used for initial_caller_sp*/, temp);
584 prepare_to_jump_from_interpreted(method);
585
586 if (JvmtiExport::can_post_interpreter_events()) {
587 // JVMTI events, such as single-stepping, are implemented partly by avoiding running
588 // compiled code in threads for which the event is enabled. Check here for
589 // interp_only_mode if these events CAN be enabled.
590 z_lg(Z_R1_scratch, Address(method, Method::from_interpreted_offset()));
591 MacroAssembler::load_and_test_int(Z_R0_scratch, Address(Z_thread, JavaThread::interp_only_mode_offset()));
592 z_bcr(bcondEqual, Z_R1_scratch); // Run compiled code if zero.
593 // Run interpreted.
594 z_lg(Z_R1_scratch, Address(method, Method::interpreter_entry_offset()));
595 z_br(Z_R1_scratch);
596 } else {
597 // Run compiled code.
598 z_lg(Z_R1_scratch, Address(method, Method::from_interpreted_offset()));
599 z_br(Z_R1_scratch);
600 }
601 }
602
603 #ifdef ASSERT
604 void InterpreterMacroAssembler::verify_esp(Register Resp, Register Rtemp) {
605 // About to read or write Resp[0].
606 // Make sure it is not in the monitors or the TOP_IJAVA_FRAME_ABI.
607 address reentry = nullptr;
608
609 {
610 // Check if the frame pointer in Z_fp is correct.
611 NearLabel OK;
612 z_cg(Z_fp, 0, Z_SP);
613 z_bre(OK);
614 reentry = stop_chain_static(reentry, "invalid frame pointer Z_fp");
615 bind(OK);
616 }
617 {
618 // Resp must not point into or below the operand stack,
619 // i.e. IJAVA_STATE.monitors > Resp.
620 NearLabel OK;
621 Register Rmonitors = Rtemp;
622 z_lg(Rmonitors, _z_ijava_state_neg(monitors), Z_fp);
623 compareU64_and_branch(Rmonitors, Resp, bcondHigh, OK);
624 reentry = stop_chain_static(reentry, "too many pops: Z_esp points into monitor area");
625 bind(OK);
626 }
627 {
628 // Resp may point to the last word of TOP_IJAVA_FRAME_ABI, but not below
629 // i.e. !(Z_SP + frame::z_top_ijava_frame_abi_size - Interpreter::stackElementSize > Resp).
630 NearLabel OK;
631 Register Rabi_bottom = Rtemp;
632 add2reg(Rabi_bottom, frame::z_top_ijava_frame_abi_size - Interpreter::stackElementSize, Z_SP);
633 compareU64_and_branch(Rabi_bottom, Resp, bcondNotHigh, OK);
634 reentry = stop_chain_static(reentry, "too many pushes: Z_esp points into TOP_IJAVA_FRAME_ABI");
635 bind(OK);
636 }
637 }
638
639 void InterpreterMacroAssembler::asm_assert_ijava_state_magic(Register tmp) {
640 Label magic_ok;
641 load_const_optimized(tmp, frame::z_istate_magic_number);
642 z_cg(tmp, Address(Z_fp, _z_ijava_state_neg(magic)));
643 z_bre(magic_ok);
644 stop_static("error: wrong magic number in ijava_state access");
645 bind(magic_ok);
646 }
647 #endif // ASSERT
648
649 void InterpreterMacroAssembler::save_bcp() {
650 z_stg(Z_bcp, Address(Z_fp, _z_ijava_state_neg(bcp)));
651 asm_assert_ijava_state_magic(Z_bcp);
652 NOT_PRODUCT(z_lg(Z_bcp, Address(Z_fp, _z_ijava_state_neg(bcp))));
653 }
654
655 void InterpreterMacroAssembler::restore_bcp() {
656 asm_assert_ijava_state_magic(Z_bcp);
657 z_lg(Z_bcp, Address(Z_fp, _z_ijava_state_neg(bcp)));
658 }
659
660 void InterpreterMacroAssembler::save_esp() {
661 z_stg(Z_esp, Address(Z_fp, _z_ijava_state_neg(esp)));
662 }
663
664 void InterpreterMacroAssembler::restore_esp() {
665 asm_assert_ijava_state_magic(Z_esp);
666 z_lg(Z_esp, Address(Z_fp, _z_ijava_state_neg(esp)));
667 }
668
669 void InterpreterMacroAssembler::get_monitors(Register reg) {
670 asm_assert_ijava_state_magic(reg);
671 mem2reg_opt(reg, Address(Z_fp, _z_ijava_state_neg(monitors)));
672 }
673
674 void InterpreterMacroAssembler::save_monitors(Register reg) {
675 reg2mem_opt(reg, Address(Z_fp, _z_ijava_state_neg(monitors)));
676 }
677
678 void InterpreterMacroAssembler::get_mdp(Register mdp) {
679 z_lg(mdp, _z_ijava_state_neg(mdx), Z_fp);
680 }
681
682 void InterpreterMacroAssembler::save_mdp(Register mdp) {
683 z_stg(mdp, _z_ijava_state_neg(mdx), Z_fp);
684 }
685
686 // Values that are only read (besides initialization).
687 void InterpreterMacroAssembler::restore_locals() {
688 asm_assert_ijava_state_magic(Z_locals);
689 z_lg(Z_locals, Address(Z_fp, _z_ijava_state_neg(locals)));
690 }
691
692 void InterpreterMacroAssembler::get_method(Register reg) {
693 asm_assert_ijava_state_magic(reg);
694 z_lg(reg, Address(Z_fp, _z_ijava_state_neg(method)));
695 }
696
697 void InterpreterMacroAssembler::get_2_byte_integer_at_bcp(Register Rdst, int bcp_offset,
698 signedOrNot is_signed) {
699 // Rdst is an 8-byte return value!!!
700
701 // Unaligned loads incur only a small penalty on z/Architecture. The penalty
702 // is a few (2..3) ticks, even when the load crosses a cache line
703 // boundary. In case of a cache miss, the stall could, of course, be
704 // much longer.
705
706 switch (is_signed) {
707 case Signed:
708 z_lgh(Rdst, bcp_offset, Z_R0, Z_bcp);
709 break;
710 case Unsigned:
711 z_llgh(Rdst, bcp_offset, Z_R0, Z_bcp);
712 break;
713 default:
714 ShouldNotReachHere();
715 }
716 }
717
718
719 void InterpreterMacroAssembler::get_4_byte_integer_at_bcp(Register Rdst, int bcp_offset,
720 setCCOrNot set_cc) {
721 // Rdst is an 8-byte return value!!!
722
723 // Unaligned loads incur only a small penalty on z/Architecture. The penalty
724 // is a few (2..3) ticks, even when the load crosses a cache line
725 // boundary. In case of a cache miss, the stall could, of course, be
726 // much longer.
727
728 // Both variants implement a sign-extending int2long load.
729 if (set_cc == set_CC) {
730 load_and_test_int2long(Rdst, Address(Z_bcp, (intptr_t)bcp_offset));
731 } else {
732 mem2reg_signed_opt( Rdst, Address(Z_bcp, (intptr_t)bcp_offset));
733 }
734 }
735
736 void InterpreterMacroAssembler::get_constant_pool(Register Rdst) {
737 get_method(Rdst);
738 mem2reg_opt(Rdst, Address(Rdst, Method::const_offset()));
739 mem2reg_opt(Rdst, Address(Rdst, ConstMethod::constants_offset()));
740 }
741
742 void InterpreterMacroAssembler::get_constant_pool_cache(Register Rdst) {
743 get_constant_pool(Rdst);
744 mem2reg_opt(Rdst, Address(Rdst, ConstantPool::cache_offset()));
745 }
746
747 void InterpreterMacroAssembler::get_cpool_and_tags(Register Rcpool, Register Rtags) {
748 get_constant_pool(Rcpool);
749 mem2reg_opt(Rtags, Address(Rcpool, ConstantPool::tags_offset()));
750 }
751
752 // Unlock if synchronized method.
753 //
754 // Unlock the receiver if this is a synchronized method.
755 // Unlock any Java monitors from synchronized blocks.
756 //
757 // If there are locked Java monitors
758 // If throw_monitor_exception
759 // throws IllegalMonitorStateException
760 // Else if install_monitor_exception
761 // installs IllegalMonitorStateException
762 // Else
763 // no error processing
764 void InterpreterMacroAssembler::unlock_if_synchronized_method(TosState state,
765 bool throw_monitor_exception,
766 bool install_monitor_exception) {
767 NearLabel unlocked, unlock, no_unlock;
768
769 {
770 Register R_method = Z_ARG2;
771 Register R_do_not_unlock_if_synchronized = Z_ARG3;
772
773 // Get the value of _do_not_unlock_if_synchronized into G1_scratch.
774 const Address do_not_unlock_if_synchronized(Z_thread,
775 JavaThread::do_not_unlock_if_synchronized_offset());
776 load_sized_value(R_do_not_unlock_if_synchronized, do_not_unlock_if_synchronized, 1, false /*unsigned*/);
777 z_mvi(do_not_unlock_if_synchronized, false); // Reset the flag.
778
779 // Check if synchronized method.
780 get_method(R_method);
781 verify_oop(Z_tos, state);
782 push(state); // Save tos/result.
783 testbit(method2_(R_method, access_flags), JVM_ACC_SYNCHRONIZED_BIT);
784 z_bfalse(unlocked);
785
786 // Don't unlock anything if the _do_not_unlock_if_synchronized flag
787 // is set.
788 compareU64_and_branch(R_do_not_unlock_if_synchronized, (intptr_t)0L, bcondNotEqual, no_unlock);
789 }
790
791 // unlock monitor
792
793 // BasicObjectLock will be first in list, since this is a
794 // synchronized method. However, need to check that the object has
795 // not been unlocked by an explicit monitorexit bytecode.
796 const Address monitor(Z_fp, -(frame::z_ijava_state_size + (int) sizeof(BasicObjectLock)));
797 // We use Z_ARG2 so that if we go slow path it will be the correct
798 // register for unlock_object to pass to VM directly.
799 load_address(Z_ARG2, monitor); // Address of first monitor.
800 z_lg(Z_ARG3, Address(Z_ARG2, BasicObjectLock::obj_offset()));
801 compareU64_and_branch(Z_ARG3, (intptr_t)0L, bcondNotEqual, unlock);
802
803 if (throw_monitor_exception) {
804 // Entry already unlocked need to throw an exception.
805 MacroAssembler::call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_illegal_monitor_state_exception));
806 should_not_reach_here();
807 } else {
808 // Monitor already unlocked during a stack unroll.
809 // If requested, install an illegal_monitor_state_exception.
810 // Continue with stack unrolling.
811 if (install_monitor_exception) {
812 MacroAssembler::call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::new_illegal_monitor_state_exception));
813 }
814 z_bru(unlocked);
815 }
816
817 bind(unlock);
818
819 unlock_object(Z_ARG2);
820
821 bind(unlocked);
822
823 // I0, I1: Might contain return value
824
825 // Check that all monitors are unlocked.
826 {
827 NearLabel loop, exception, entry, restart;
828 const int entry_size = frame::interpreter_frame_monitor_size_in_bytes();
829 // We use Z_ARG2 so that if we go slow path it will be the correct
830 // register for unlock_object to pass to VM directly.
831 Register R_current_monitor = Z_ARG2;
832 Register R_monitor_block_bot = Z_ARG1;
833 const Address monitor_block_top(Z_fp, _z_ijava_state_neg(monitors));
834 const Address monitor_block_bot(Z_fp, -frame::z_ijava_state_size);
835
836 bind(restart);
837 // Starting with top-most entry.
838 z_lg(R_current_monitor, monitor_block_top);
839 // Points to word before bottom of monitor block.
840 load_address(R_monitor_block_bot, monitor_block_bot);
841 z_bru(entry);
842
843 // Entry already locked, need to throw exception.
844 bind(exception);
845
846 if (throw_monitor_exception) {
847 // Throw exception.
848 MacroAssembler::call_VM(noreg,
849 CAST_FROM_FN_PTR(address, InterpreterRuntime::
850 throw_illegal_monitor_state_exception));
851 should_not_reach_here();
852 } else {
853 // Stack unrolling. Unlock object and install illegal_monitor_exception.
854 // Unlock does not block, so don't have to worry about the frame.
855 // We don't have to preserve c_rarg1 since we are going to throw an exception.
856 unlock_object(R_current_monitor);
857 if (install_monitor_exception) {
858 call_VM(noreg, CAST_FROM_FN_PTR(address,
859 InterpreterRuntime::
860 new_illegal_monitor_state_exception));
861 }
862 z_bru(restart);
863 }
864
865 bind(loop);
866 // Check if current entry is used.
867 load_and_test_long(Z_R0_scratch, Address(R_current_monitor, BasicObjectLock::obj_offset()));
868 z_brne(exception);
869
870 add2reg(R_current_monitor, entry_size); // Otherwise advance to next entry.
871 bind(entry);
872 compareU64_and_branch(R_current_monitor, R_monitor_block_bot, bcondNotEqual, loop);
873 }
874
875 bind(no_unlock);
876 pop(state);
877 verify_oop(Z_tos, state);
878 }
879
880 void InterpreterMacroAssembler::narrow(Register result, Register ret_type) {
881 get_method(ret_type);
882 z_lg(ret_type, Address(ret_type, in_bytes(Method::const_offset())));
883 z_lb(ret_type, Address(ret_type, in_bytes(ConstMethod::result_type_offset())));
884
885 Label notBool, notByte, notChar, done;
886
887 // common case first
888 compareU32_and_branch(ret_type, T_INT, bcondEqual, done);
889
890 compareU32_and_branch(ret_type, T_BOOLEAN, bcondNotEqual, notBool);
891 z_nilf(result, 0x1);
892 z_bru(done);
893
894 bind(notBool);
895 compareU32_and_branch(ret_type, T_BYTE, bcondNotEqual, notByte);
896 z_lbr(result, result);
897 z_bru(done);
898
899 bind(notByte);
900 compareU32_and_branch(ret_type, T_CHAR, bcondNotEqual, notChar);
901 z_nilf(result, 0xffff);
902 z_bru(done);
903
904 bind(notChar);
905 // compareU32_and_branch(ret_type, T_SHORT, bcondNotEqual, notShort);
906 z_lhr(result, result);
907
908 // Nothing to do for T_INT
909 bind(done);
910 }
911
912 // remove activation
913 //
914 // Unlock the receiver if this is a synchronized method.
915 // Unlock any Java monitors from synchronized blocks.
916 // Remove the activation from the stack.
917 //
918 // If there are locked Java monitors
919 // If throw_monitor_exception
920 // throws IllegalMonitorStateException
921 // Else if install_monitor_exception
922 // installs IllegalMonitorStateException
923 // Else
924 // no error processing
925 void InterpreterMacroAssembler::remove_activation(TosState state,
926 Register return_pc,
927 bool throw_monitor_exception,
928 bool install_monitor_exception,
929 bool notify_jvmti) {
930 BLOCK_COMMENT("remove_activation {");
931 unlock_if_synchronized_method(state, throw_monitor_exception, install_monitor_exception);
932
933 // Save result (push state before jvmti call and pop it afterwards) and notify jvmti.
934 notify_method_exit(false, state, notify_jvmti ? NotifyJVMTI : SkipNotifyJVMTI);
935
936 if (StackReservedPages > 0) {
937 BLOCK_COMMENT("reserved_stack_check:");
938 // Test if reserved zone needs to be enabled.
939 Label no_reserved_zone_enabling;
940
941 // check if already enabled - if so no re-enabling needed
942 assert(sizeof(StackOverflow::StackGuardState) == 4, "unexpected size");
943 z_ly(Z_R0, Address(Z_thread, JavaThread::stack_guard_state_offset()));
944 compare32_and_branch(Z_R0, StackOverflow::stack_guard_enabled, bcondEqual, no_reserved_zone_enabling);
945
946 // Compare frame pointers. There is no good stack pointer, as with stack
947 // frame compression we can get different SPs when we do calls. A subsequent
948 // call could have a smaller SP, so that this compare succeeds for an
949 // inner call of the method annotated with ReservedStack.
950 z_lg(Z_R0, Address(Z_SP, (intptr_t)_z_abi(callers_sp)));
951 z_clg(Z_R0, Address(Z_thread, JavaThread::reserved_stack_activation_offset())); // Compare with frame pointer in memory.
952 z_brl(no_reserved_zone_enabling);
953
954 // Enable reserved zone again, throw stack overflow exception.
955 call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::enable_stack_reserved_zone), Z_thread);
956 call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_delayed_StackOverflowError));
957
958 should_not_reach_here();
959
960 bind(no_reserved_zone_enabling);
961 }
962
963 verify_oop(Z_tos, state);
964
965 pop_interpreter_frame(return_pc, Z_ARG2, Z_ARG3);
966 BLOCK_COMMENT("} remove_activation");
967 }
968
969 // lock object
970 //
971 // Registers alive
972 // monitor (Z_R10) - Address of the BasicObjectLock to be used for locking,
973 // which must be initialized with the object to lock.
974 // object (Z_R11, Z_R2) - Address of the object to be locked.
975 // templateTable (monitorenter) is using Z_R2 for object
976 void InterpreterMacroAssembler::lock_object(Register monitor, Register object) {
977
978 if (LockingMode == LM_MONITOR) {
979 call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorenter), monitor);
980 return;
981 }
982
983 // template code: (for LM_LEGACY)
984 //
985 // markWord displaced_header = obj->mark().set_unlocked();
986 // monitor->lock()->set_displaced_header(displaced_header);
987 // if (Atomic::cmpxchg(/*addr*/obj->mark_addr(), /*cmp*/displaced_header, /*ex=*/monitor) == displaced_header) {
988 // // We stored the monitor address into the object's mark word.
989 // } else if (THREAD->is_lock_owned((address)displaced_header))
990 // // Simple recursive case.
991 // monitor->lock()->set_displaced_header(nullptr);
992 // } else {
993 // // Slow path.
994 // InterpreterRuntime::monitorenter(THREAD, monitor);
995 // }
996
997 const int hdr_offset = oopDesc::mark_offset_in_bytes();
998
999 const Register header = Z_ARG5;
1000 const Register object_mark_addr = Z_ARG4;
1001 const Register current_header = Z_ARG5;
1002 const Register tmp = Z_R1_scratch;
1003
1004 NearLabel done, slow_case;
1005
1006 // markWord header = obj->mark().set_unlocked();
1007
1008 // Load markWord from object into header.
1009 z_lg(header, hdr_offset, object);
1010
1011 if (DiagnoseSyncOnValueBasedClasses != 0) {
1012 load_klass(tmp, object);
1013 testbit(Address(tmp, Klass::access_flags_offset()), exact_log2(JVM_ACC_IS_VALUE_BASED_CLASS));
1014 z_btrue(slow_case);
1015 }
1016
1017 if (LockingMode == LM_LIGHTWEIGHT) {
1018 lightweight_lock(object, /* mark word */ header, tmp, slow_case);
1019 } else if (LockingMode == LM_LEGACY) {
1020
1021 // Set header to be (markWord of object | UNLOCK_VALUE).
1022 // This will not change anything if it was unlocked before.
1023 z_oill(header, markWord::unlocked_value);
1024
1025 // monitor->lock()->set_displaced_header(displaced_header);
1026 const int lock_offset = in_bytes(BasicObjectLock::lock_offset());
1027 const int mark_offset = lock_offset + BasicLock::displaced_header_offset_in_bytes();
1028
1029 // Initialize the box (Must happen before we update the object mark!).
1030 z_stg(header, mark_offset, monitor);
1031
1032 // if (Atomic::cmpxchg(/*addr*/obj->mark_addr(), /*cmp*/displaced_header, /*ex=*/monitor) == displaced_header) {
1033
1034 // not necessary, use offset in instruction directly.
1035 // add2reg(object_mark_addr, hdr_offset, object);
1036
1037 // Store stack address of the BasicObjectLock (this is monitor) into object.
1038 z_csg(header, monitor, hdr_offset, object);
1039 assert(current_header == header,
1040 "must be same register"); // Identified two registers from z/Architecture.
1041
1042 z_bre(done);
1043
1044 // } else if (THREAD->is_lock_owned((address)displaced_header))
1045 // // Simple recursive case.
1046 // monitor->lock()->set_displaced_header(nullptr);
1047
1048 // We did not see an unlocked object so try the fast recursive case.
1049
1050 // Check if owner is self by comparing the value in the markWord of object
1051 // (current_header) with the stack pointer.
1052 z_sgr(current_header, Z_SP);
1053
1054 assert(os::vm_page_size() > 0xfff, "page size too small - change the constant");
1055
1056 // The prior sequence "LGR, NGR, LTGR" can be done better
1057 // (Z_R1 is temp and not used after here).
1058 load_const_optimized(Z_R0, (~(os::vm_page_size() - 1) | markWord::lock_mask_in_place));
1059 z_ngr(Z_R0, current_header); // AND sets CC (result eq/ne 0)
1060
1061 // If condition is true we are done and hence we can store 0 in the displaced
1062 // header indicating it is a recursive lock and be done.
1063 z_brne(slow_case);
1064 z_release(); // Member unnecessary on zarch AND because the above csg does a sync before and after.
1065 z_stg(Z_R0/*==0!*/, mark_offset, monitor);
1066 }
1067 z_bru(done);
1068 // } else {
1069 // // Slow path.
1070 // InterpreterRuntime::monitorenter(THREAD, monitor);
1071
1072 // None of the above fast optimizations worked so we have to get into the
1073 // slow case of monitor enter.
1074 bind(slow_case);
1075 call_VM(noreg,
1076 CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorenter),
1077 monitor);
1078 // }
1079
1080 bind(done);
1081 }
1082
1083 // Unlocks an object. Used in monitorexit bytecode and remove_activation.
1084 //
1085 // Registers alive
1086 // monitor - address of the BasicObjectLock to be used for locking,
1087 // which must be initialized with the object to lock.
1088 //
1089 // Throw IllegalMonitorException if object is not locked by current thread.
1090 void InterpreterMacroAssembler::unlock_object(Register monitor, Register object) {
1091
1092 if (LockingMode == LM_MONITOR) {
1093 call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorexit), monitor);
1094 return;
1095 }
1096
1097 // else {
1098 // template code: (for LM_LEGACY):
1099 //
1100 // if ((displaced_header = monitor->displaced_header()) == nullptr) {
1101 // // Recursive unlock. Mark the monitor unlocked by setting the object field to null.
1102 // monitor->set_obj(nullptr);
1103 // } else if (Atomic::cmpxchg(obj->mark_addr(), monitor, displaced_header) == monitor) {
1104 // // We swapped the unlocked mark in displaced_header into the object's mark word.
1105 // monitor->set_obj(nullptr);
1106 // } else {
1107 // // Slow path.
1108 // InterpreterRuntime::monitorexit(monitor);
1109 // }
1110
1111 const int hdr_offset = oopDesc::mark_offset_in_bytes();
1112
1113 const Register header = Z_ARG4;
1114 const Register current_header = Z_R1_scratch;
1115 Address obj_entry(monitor, BasicObjectLock::obj_offset());
1116 Label done, slow_case;
1117
1118 if (object == noreg) {
1119 // In the template interpreter, we must assure that the object
1120 // entry in the monitor is cleared on all paths. Thus we move
1121 // loading up to here, and clear the entry afterwards.
1122 object = Z_ARG3; // Use Z_ARG3 if caller didn't pass object.
1123 z_lg(object, obj_entry);
1124 }
1125
1126 assert_different_registers(monitor, object, header, current_header);
1127
1128 // if ((displaced_header = monitor->displaced_header()) == nullptr) {
1129 // // Recursive unlock. Mark the monitor unlocked by setting the object field to null.
1130 // monitor->set_obj(nullptr);
1131
1132 // monitor->lock()->set_displaced_header(displaced_header);
1133 const int lock_offset = in_bytes(BasicObjectLock::lock_offset());
1134 const int mark_offset = lock_offset + BasicLock::displaced_header_offset_in_bytes();
1135
1136 clear_mem(obj_entry, sizeof(oop));
1137 if (LockingMode != LM_LIGHTWEIGHT) {
1138 // Test first if we are in the fast recursive case.
1139 MacroAssembler::load_and_test_long(header, Address(monitor, mark_offset));
1140 z_bre(done); // header == 0 -> goto done
1141 }
1142
1143 // } else if (Atomic::cmpxchg(obj->mark_addr(), monitor, displaced_header) == monitor) {
1144 // // We swapped the unlocked mark in displaced_header into the object's mark word.
1145 // monitor->set_obj(nullptr);
1146
1147 // If we still have a lightweight lock, unlock the object and be done.
1148 if (LockingMode == LM_LIGHTWEIGHT) {
1149 // Check for non-symmetric locking. This is allowed by the spec and the interpreter
1150 // must handle it.
1151
1152 Register tmp = current_header;
1153
1154 // First check for lock-stack underflow.
1155 z_lgf(tmp, Address(Z_thread, JavaThread::lock_stack_top_offset()));
1156 compareU32_and_branch(tmp, (unsigned)LockStack::start_offset(), Assembler::bcondNotHigh, slow_case);
1157
1158 // Then check if the top of the lock-stack matches the unlocked object.
1159 z_aghi(tmp, -oopSize);
1160 z_lg(tmp, Address(Z_thread, tmp));
1161 compare64_and_branch(tmp, object, Assembler::bcondNotEqual, slow_case);
1162
1163 z_lg(header, Address(object, hdr_offset));
1164 z_lgr(tmp, header);
1165 z_nill(tmp, markWord::monitor_value);
1166 z_brne(slow_case);
1167
1168 lightweight_unlock(object, header, tmp, slow_case);
1169
1170 z_bru(done);
1171 } else {
1172 // The markword is expected to be at offset 0.
1173 // This is not required on s390, at least not here.
1174 assert(hdr_offset == 0, "unlock_object: review code below");
1175
1176 // We have the displaced header in header. If the lock is still
1177 // lightweight, it will contain the monitor address and we'll store the
1178 // displaced header back into the object's mark word.
1179 z_lgr(current_header, monitor);
1180 z_csg(current_header, header, hdr_offset, object);
1181 z_bre(done);
1182 }
1183
1184 // } else {
1185 // // Slow path.
1186 // InterpreterRuntime::monitorexit(monitor);
1187
1188 // The lock has been converted into a heavy lock and hence
1189 // we need to get into the slow case.
1190 bind(slow_case);
1191 z_stg(object, obj_entry); // Restore object entry, has been cleared above.
1192 call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorexit), monitor);
1193
1194 // }
1195
1196 bind(done);
1197 }
1198
1199 void InterpreterMacroAssembler::test_method_data_pointer(Register mdp, Label& zero_continue) {
1200 assert(ProfileInterpreter, "must be profiling interpreter");
1201 load_and_test_long(mdp, Address(Z_fp, _z_ijava_state_neg(mdx)));
1202 z_brz(zero_continue);
1203 }
1204
1205 // Set the method data pointer for the current bcp.
1206 void InterpreterMacroAssembler::set_method_data_pointer_for_bcp() {
1207 assert(ProfileInterpreter, "must be profiling interpreter");
1208 Label set_mdp;
1209 Register mdp = Z_ARG4;
1210 Register method = Z_ARG5;
1211
1212 get_method(method);
1213 // Test MDO to avoid the call if it is null.
1214 load_and_test_long(mdp, method2_(method, method_data));
1215 z_brz(set_mdp);
1216
1217 call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::bcp_to_di), method, Z_bcp);
1218 // Z_RET: mdi
1219 // Mdo is guaranteed to be non-zero here, we checked for it before the call.
1220 assert(method->is_nonvolatile(), "choose nonvolatile reg or reload from frame");
1221 z_lg(mdp, method2_(method, method_data)); // Must reload, mdp is volatile reg.
1222 add2reg_with_index(mdp, in_bytes(MethodData::data_offset()), Z_RET, mdp);
1223
1224 bind(set_mdp);
1225 save_mdp(mdp);
1226 }
1227
1228 void InterpreterMacroAssembler::verify_method_data_pointer() {
1229 assert(ProfileInterpreter, "must be profiling interpreter");
1230 #ifdef ASSERT
1231 NearLabel verify_continue;
1232 Register bcp_expected = Z_ARG3;
1233 Register mdp = Z_ARG4;
1234 Register method = Z_ARG5;
1235
1236 test_method_data_pointer(mdp, verify_continue); // If mdp is zero, continue
1237 get_method(method);
1238
1239 // If the mdp is valid, it will point to a DataLayout header which is
1240 // consistent with the bcp. The converse is highly probable also.
1241 load_sized_value(bcp_expected, Address(mdp, DataLayout::bci_offset()), 2, false /*signed*/);
1242 z_ag(bcp_expected, Address(method, Method::const_offset()));
1243 load_address(bcp_expected, Address(bcp_expected, ConstMethod::codes_offset()));
1244 compareU64_and_branch(bcp_expected, Z_bcp, bcondEqual, verify_continue);
1245 call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::verify_mdp), method, Z_bcp, mdp);
1246 bind(verify_continue);
1247 #endif // ASSERT
1248 }
1249
1250 void InterpreterMacroAssembler::set_mdp_data_at(Register mdp_in, int constant, Register value) {
1251 assert(ProfileInterpreter, "must be profiling interpreter");
1252 z_stg(value, constant, mdp_in);
1253 }
1254
1255 void InterpreterMacroAssembler::increment_mdp_data_at(Register mdp_in,
1256 int constant,
1257 Register tmp,
1258 bool decrement) {
1259 assert_different_registers(mdp_in, tmp);
1260 // counter address
1261 Address data(mdp_in, constant);
1262 const int delta = decrement ? -DataLayout::counter_increment : DataLayout::counter_increment;
1263 add2mem_64(Address(mdp_in, constant), delta, tmp);
1264 }
1265
1266 void InterpreterMacroAssembler::set_mdp_flag_at(Register mdp_in,
1267 int flag_byte_constant) {
1268 assert(ProfileInterpreter, "must be profiling interpreter");
1269 // Set the flag.
1270 z_oi(Address(mdp_in, DataLayout::flags_offset()), flag_byte_constant);
1271 }
1272
1273 void InterpreterMacroAssembler::test_mdp_data_at(Register mdp_in,
1274 int offset,
1275 Register value,
1276 Register test_value_out,
1277 Label& not_equal_continue) {
1278 assert(ProfileInterpreter, "must be profiling interpreter");
1279 if (test_value_out == noreg) {
1280 z_cg(value, Address(mdp_in, offset));
1281 z_brne(not_equal_continue);
1282 } else {
1283 // Put the test value into a register, so caller can use it:
1284 z_lg(test_value_out, Address(mdp_in, offset));
1285 compareU64_and_branch(test_value_out, value, bcondNotEqual, not_equal_continue);
1286 }
1287 }
1288
1289 void InterpreterMacroAssembler::update_mdp_by_offset(Register mdp_in, int offset_of_disp) {
1290 update_mdp_by_offset(mdp_in, noreg, offset_of_disp);
1291 }
1292
1293 void InterpreterMacroAssembler::update_mdp_by_offset(Register mdp_in,
1294 Register dataidx,
1295 int offset_of_disp) {
1296 assert(ProfileInterpreter, "must be profiling interpreter");
1297 Address disp_address(mdp_in, dataidx, offset_of_disp);
1298 Assembler::z_ag(mdp_in, disp_address);
1299 save_mdp(mdp_in);
1300 }
1301
1302 void InterpreterMacroAssembler::update_mdp_by_constant(Register mdp_in, int constant) {
1303 assert(ProfileInterpreter, "must be profiling interpreter");
1304 add2reg(mdp_in, constant);
1305 save_mdp(mdp_in);
1306 }
1307
1308 void InterpreterMacroAssembler::update_mdp_for_ret(Register return_bci) {
1309 assert(ProfileInterpreter, "must be profiling interpreter");
1310 assert(return_bci->is_nonvolatile(), "choose nonvolatile reg or save/restore");
1311 call_VM(noreg,
1312 CAST_FROM_FN_PTR(address, InterpreterRuntime::update_mdp_for_ret),
1313 return_bci);
1314 }
1315
1316 void InterpreterMacroAssembler::profile_taken_branch(Register mdp, Register bumped_count) {
1317 if (ProfileInterpreter) {
1318 Label profile_continue;
1319
1320 // If no method data exists, go to profile_continue.
1321 // Otherwise, assign to mdp.
1322 test_method_data_pointer(mdp, profile_continue);
1323
1324 // We are taking a branch. Increment the taken count.
1325 // We inline increment_mdp_data_at to return bumped_count in a register
1326 //increment_mdp_data_at(mdp, in_bytes(JumpData::taken_offset()));
1327 Address data(mdp, JumpData::taken_offset());
1328 z_lg(bumped_count, data);
1329 // 64-bit overflow is very unlikely. Saturation to 32-bit values is
1330 // performed when reading the counts.
1331 add2reg(bumped_count, DataLayout::counter_increment);
1332 z_stg(bumped_count, data); // Store back out
1333
1334 // The method data pointer needs to be updated to reflect the new target.
1335 update_mdp_by_offset(mdp, in_bytes(JumpData::displacement_offset()));
1336 bind(profile_continue);
1337 }
1338 }
1339
1340 // Kills Z_R1_scratch.
1341 void InterpreterMacroAssembler::profile_not_taken_branch(Register mdp) {
1342 if (ProfileInterpreter) {
1343 Label profile_continue;
1344
1345 // If no method data exists, go to profile_continue.
1346 test_method_data_pointer(mdp, profile_continue);
1347
1348 // We are taking a branch. Increment the not taken count.
1349 increment_mdp_data_at(mdp, in_bytes(BranchData::not_taken_offset()), Z_R1_scratch);
1350
1351 // The method data pointer needs to be updated to correspond to
1352 // the next bytecode.
1353 update_mdp_by_constant(mdp, in_bytes(BranchData::branch_data_size()));
1354 bind(profile_continue);
1355 }
1356 }
1357
1358 // Kills: Z_R1_scratch.
1359 void InterpreterMacroAssembler::profile_call(Register mdp) {
1360 if (ProfileInterpreter) {
1361 Label profile_continue;
1362
1363 // If no method data exists, go to profile_continue.
1364 test_method_data_pointer(mdp, profile_continue);
1365
1366 // We are making a call. Increment the count.
1367 increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset()));
1368
1369 // The method data pointer needs to be updated to reflect the new target.
1370 update_mdp_by_constant(mdp, in_bytes(CounterData::counter_data_size()));
1371 bind(profile_continue);
1372 }
1373 }
1374
1375 void InterpreterMacroAssembler::profile_final_call(Register mdp) {
1376 if (ProfileInterpreter) {
1377 Label profile_continue;
1378
1379 // If no method data exists, go to profile_continue.
1380 test_method_data_pointer(mdp, profile_continue);
1381
1382 // We are making a call. Increment the count.
1383 increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset()));
1384
1385 // The method data pointer needs to be updated to reflect the new target.
1386 update_mdp_by_constant(mdp, in_bytes(VirtualCallData::virtual_call_data_size()));
1387 bind(profile_continue);
1388 }
1389 }
1390
1391 void InterpreterMacroAssembler::profile_virtual_call(Register receiver,
1392 Register mdp,
1393 Register reg2,
1394 bool receiver_can_be_null) {
1395 if (ProfileInterpreter) {
1396 NearLabel profile_continue;
1397
1398 // If no method data exists, go to profile_continue.
1399 test_method_data_pointer(mdp, profile_continue);
1400
1401 NearLabel skip_receiver_profile;
1402 if (receiver_can_be_null) {
1403 NearLabel not_null;
1404 compareU64_and_branch(receiver, (intptr_t)0L, bcondNotEqual, not_null);
1405 // We are making a call. Increment the count for null receiver.
1406 increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset()));
1407 z_bru(skip_receiver_profile);
1408 bind(not_null);
1409 }
1410
1411 // Record the receiver type.
1412 record_klass_in_profile(receiver, mdp, reg2);
1413 bind(skip_receiver_profile);
1414
1415 // The method data pointer needs to be updated to reflect the new target.
1416 update_mdp_by_constant(mdp, in_bytes(VirtualCallData::virtual_call_data_size()));
1417 bind(profile_continue);
1418 }
1419 }
1420
1421 // This routine creates a state machine for updating the multi-row
1422 // type profile at a virtual call site (or other type-sensitive bytecode).
1423 // The machine visits each row (of receiver/count) until the receiver type
1424 // is found, or until it runs out of rows. At the same time, it remembers
1425 // the location of the first empty row. (An empty row records null for its
1426 // receiver, and can be allocated for a newly-observed receiver type.)
1427 // Because there are two degrees of freedom in the state, a simple linear
1428 // search will not work; it must be a decision tree. Hence this helper
1429 // function is recursive, to generate the required tree structured code.
1430 // It's the interpreter, so we are trading off code space for speed.
1431 // See below for example code.
1432 void InterpreterMacroAssembler::record_klass_in_profile_helper(
1433 Register receiver, Register mdp,
1434 Register reg2, int start_row,
1435 Label& done) {
1436 if (TypeProfileWidth == 0) {
1437 increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset()));
1438 return;
1439 }
1440
1441 int last_row = VirtualCallData::row_limit() - 1;
1442 assert(start_row <= last_row, "must be work left to do");
1443 // Test this row for both the receiver and for null.
1444 // Take any of three different outcomes:
1445 // 1. found receiver => increment count and goto done
1446 // 2. found null => keep looking for case 1, maybe allocate this cell
1447 // 3. found something else => keep looking for cases 1 and 2
1448 // Case 3 is handled by a recursive call.
1449 for (int row = start_row; row <= last_row; row++) {
1450 NearLabel next_test;
1451 bool test_for_null_also = (row == start_row);
1452
1453 // See if the receiver is receiver[n].
1454 int recvr_offset = in_bytes(VirtualCallData::receiver_offset(row));
1455 test_mdp_data_at(mdp, recvr_offset, receiver,
1456 (test_for_null_also ? reg2 : noreg),
1457 next_test);
1458 // (Reg2 now contains the receiver from the CallData.)
1459
1460 // The receiver is receiver[n]. Increment count[n].
1461 int count_offset = in_bytes(VirtualCallData::receiver_count_offset(row));
1462 increment_mdp_data_at(mdp, count_offset);
1463 z_bru(done);
1464 bind(next_test);
1465
1466 if (test_for_null_also) {
1467 Label found_null;
1468 // Failed the equality check on receiver[n]... Test for null.
1469 z_ltgr(reg2, reg2);
1470 if (start_row == last_row) {
1471 // The only thing left to do is handle the null case.
1472 z_brz(found_null);
1473 // Receiver did not match any saved receiver and there is no empty row for it.
1474 // Increment total counter to indicate polymorphic case.
1475 increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset()));
1476 z_bru(done);
1477 bind(found_null);
1478 break;
1479 }
1480 // Since null is rare, make it be the branch-taken case.
1481 z_brz(found_null);
1482
1483 // Put all the "Case 3" tests here.
1484 record_klass_in_profile_helper(receiver, mdp, reg2, start_row + 1, done);
1485
1486 // Found a null. Keep searching for a matching receiver,
1487 // but remember that this is an empty (unused) slot.
1488 bind(found_null);
1489 }
1490 }
1491
1492 // In the fall-through case, we found no matching receiver, but we
1493 // observed the receiver[start_row] is null.
1494
1495 // Fill in the receiver field and increment the count.
1496 int recvr_offset = in_bytes(VirtualCallData::receiver_offset(start_row));
1497 set_mdp_data_at(mdp, recvr_offset, receiver);
1498 int count_offset = in_bytes(VirtualCallData::receiver_count_offset(start_row));
1499 load_const_optimized(reg2, DataLayout::counter_increment);
1500 set_mdp_data_at(mdp, count_offset, reg2);
1501 if (start_row > 0) {
1502 z_bru(done);
1503 }
1504 }
1505
1506 // Example state machine code for three profile rows:
1507 // // main copy of decision tree, rooted at row[1]
1508 // if (row[0].rec == rec) { row[0].incr(); goto done; }
1509 // if (row[0].rec != nullptr) {
1510 // // inner copy of decision tree, rooted at row[1]
1511 // if (row[1].rec == rec) { row[1].incr(); goto done; }
1512 // if (row[1].rec != nullptr) {
1513 // // degenerate decision tree, rooted at row[2]
1514 // if (row[2].rec == rec) { row[2].incr(); goto done; }
1515 // if (row[2].rec != nullptr) { count.incr(); goto done; } // overflow
1516 // row[2].init(rec); goto done;
1517 // } else {
1518 // // remember row[1] is empty
1519 // if (row[2].rec == rec) { row[2].incr(); goto done; }
1520 // row[1].init(rec); goto done;
1521 // }
1522 // } else {
1523 // // remember row[0] is empty
1524 // if (row[1].rec == rec) { row[1].incr(); goto done; }
1525 // if (row[2].rec == rec) { row[2].incr(); goto done; }
1526 // row[0].init(rec); goto done;
1527 // }
1528 // done:
1529
1530 void InterpreterMacroAssembler::record_klass_in_profile(Register receiver,
1531 Register mdp, Register reg2) {
1532 assert(ProfileInterpreter, "must be profiling");
1533 Label done;
1534
1535 record_klass_in_profile_helper(receiver, mdp, reg2, 0, done);
1536
1537 bind (done);
1538 }
1539
1540 void InterpreterMacroAssembler::profile_ret(Register return_bci, Register mdp) {
1541 if (ProfileInterpreter) {
1542 NearLabel profile_continue;
1543 uint row;
1544
1545 // If no method data exists, go to profile_continue.
1546 test_method_data_pointer(mdp, profile_continue);
1547
1548 // Update the total ret count.
1549 increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset()));
1550
1551 for (row = 0; row < RetData::row_limit(); row++) {
1552 NearLabel next_test;
1553
1554 // See if return_bci is equal to bci[n]:
1555 test_mdp_data_at(mdp,
1556 in_bytes(RetData::bci_offset(row)),
1557 return_bci, noreg,
1558 next_test);
1559
1560 // Return_bci is equal to bci[n]. Increment the count.
1561 increment_mdp_data_at(mdp, in_bytes(RetData::bci_count_offset(row)));
1562
1563 // The method data pointer needs to be updated to reflect the new target.
1564 update_mdp_by_offset(mdp, in_bytes(RetData::bci_displacement_offset(row)));
1565 z_bru(profile_continue);
1566 bind(next_test);
1567 }
1568
1569 update_mdp_for_ret(return_bci);
1570
1571 bind(profile_continue);
1572 }
1573 }
1574
1575 void InterpreterMacroAssembler::profile_null_seen(Register mdp) {
1576 if (ProfileInterpreter) {
1577 Label profile_continue;
1578
1579 // If no method data exists, go to profile_continue.
1580 test_method_data_pointer(mdp, profile_continue);
1581
1582 set_mdp_flag_at(mdp, BitData::null_seen_byte_constant());
1583
1584 // The method data pointer needs to be updated.
1585 int mdp_delta = in_bytes(BitData::bit_data_size());
1586 if (TypeProfileCasts) {
1587 mdp_delta = in_bytes(VirtualCallData::virtual_call_data_size());
1588 }
1589 update_mdp_by_constant(mdp, mdp_delta);
1590
1591 bind(profile_continue);
1592 }
1593 }
1594
1595 void InterpreterMacroAssembler::profile_typecheck(Register mdp, Register klass, Register reg2) {
1596 if (ProfileInterpreter) {
1597 Label profile_continue;
1598
1599 // If no method data exists, go to profile_continue.
1600 test_method_data_pointer(mdp, profile_continue);
1601
1602 // The method data pointer needs to be updated.
1603 int mdp_delta = in_bytes(BitData::bit_data_size());
1604 if (TypeProfileCasts) {
1605 mdp_delta = in_bytes(VirtualCallData::virtual_call_data_size());
1606
1607 // Record the object type.
1608 record_klass_in_profile(klass, mdp, reg2);
1609 }
1610 update_mdp_by_constant(mdp, mdp_delta);
1611
1612 bind(profile_continue);
1613 }
1614 }
1615
1616 void InterpreterMacroAssembler::profile_switch_default(Register mdp) {
1617 if (ProfileInterpreter) {
1618 Label profile_continue;
1619
1620 // If no method data exists, go to profile_continue.
1621 test_method_data_pointer(mdp, profile_continue);
1622
1623 // Update the default case count.
1624 increment_mdp_data_at(mdp, in_bytes(MultiBranchData::default_count_offset()));
1625
1626 // The method data pointer needs to be updated.
1627 update_mdp_by_offset(mdp, in_bytes(MultiBranchData::default_displacement_offset()));
1628
1629 bind(profile_continue);
1630 }
1631 }
1632
1633 // Kills: index, scratch1, scratch2.
1634 void InterpreterMacroAssembler::profile_switch_case(Register index,
1635 Register mdp,
1636 Register scratch1,
1637 Register scratch2) {
1638 if (ProfileInterpreter) {
1639 Label profile_continue;
1640 assert_different_registers(index, mdp, scratch1, scratch2);
1641
1642 // If no method data exists, go to profile_continue.
1643 test_method_data_pointer(mdp, profile_continue);
1644
1645 // Build the base (index * per_case_size_in_bytes()) +
1646 // case_array_offset_in_bytes().
1647 z_sllg(index, index, exact_log2(in_bytes(MultiBranchData::per_case_size())));
1648 add2reg(index, in_bytes(MultiBranchData::case_array_offset()));
1649
1650 // Add the calculated base to the mdp -> address of the case' data.
1651 Address case_data_addr(mdp, index);
1652 Register case_data = scratch1;
1653 load_address(case_data, case_data_addr);
1654
1655 // Update the case count.
1656 increment_mdp_data_at(case_data,
1657 in_bytes(MultiBranchData::relative_count_offset()),
1658 scratch2);
1659
1660 // The method data pointer needs to be updated.
1661 update_mdp_by_offset(mdp,
1662 index,
1663 in_bytes(MultiBranchData::relative_displacement_offset()));
1664
1665 bind(profile_continue);
1666 }
1667 }
1668
1669 // kills: R0, R1, flags, loads klass from obj (if not null)
1670 void InterpreterMacroAssembler::profile_obj_type(Register obj, Address mdo_addr, Register klass, bool cmp_done) {
1671 NearLabel null_seen, init_klass, do_nothing, do_update;
1672
1673 // Klass = obj is allowed.
1674 const Register tmp = Z_R1;
1675 assert_different_registers(obj, mdo_addr.base(), tmp, Z_R0);
1676 assert_different_registers(klass, mdo_addr.base(), tmp, Z_R0);
1677
1678 z_lg(tmp, mdo_addr);
1679 if (cmp_done) {
1680 z_brz(null_seen);
1681 } else {
1682 compareU64_and_branch(obj, (intptr_t)0, Assembler::bcondEqual, null_seen);
1683 }
1684
1685 MacroAssembler::verify_oop(obj, FILE_AND_LINE);
1686 load_klass(klass, obj);
1687
1688 // Klass seen before, nothing to do (regardless of unknown bit).
1689 z_lgr(Z_R0, tmp);
1690 assert(Immediate::is_uimm(~TypeEntries::type_klass_mask, 16), "or change following instruction");
1691 z_nill(Z_R0, TypeEntries::type_klass_mask & 0xFFFF);
1692 compareU64_and_branch(Z_R0, klass, Assembler::bcondEqual, do_nothing);
1693
1694 // Already unknown. Nothing to do anymore.
1695 z_tmll(tmp, TypeEntries::type_unknown);
1696 z_brc(Assembler::bcondAllOne, do_nothing);
1697
1698 z_lgr(Z_R0, tmp);
1699 assert(Immediate::is_uimm(~TypeEntries::type_mask, 16), "or change following instruction");
1700 z_nill(Z_R0, TypeEntries::type_mask & 0xFFFF);
1701 compareU64_and_branch(Z_R0, (intptr_t)0, Assembler::bcondEqual, init_klass);
1702
1703 // Different than before. Cannot keep accurate profile.
1704 z_oill(tmp, TypeEntries::type_unknown);
1705 z_bru(do_update);
1706
1707 bind(init_klass);
1708 // Combine klass and null_seen bit (only used if (tmp & type_mask)==0).
1709 z_ogr(tmp, klass);
1710 z_bru(do_update);
1711
1712 bind(null_seen);
1713 // Set null_seen if obj is 0.
1714 z_oill(tmp, TypeEntries::null_seen);
1715 // fallthru: z_bru(do_update);
1716
1717 bind(do_update);
1718 z_stg(tmp, mdo_addr);
1719
1720 bind(do_nothing);
1721 }
1722
1723 void InterpreterMacroAssembler::profile_arguments_type(Register mdp, Register callee, Register tmp, bool is_virtual) {
1724 if (!ProfileInterpreter) {
1725 return;
1726 }
1727
1728 assert_different_registers(mdp, callee, tmp);
1729
1730 if (MethodData::profile_arguments() || MethodData::profile_return()) {
1731 Label profile_continue;
1732
1733 test_method_data_pointer(mdp, profile_continue);
1734
1735 int off_to_start = is_virtual ? in_bytes(VirtualCallData::virtual_call_data_size()) : in_bytes(CounterData::counter_data_size());
1736
1737 z_cliy(in_bytes(DataLayout::tag_offset()) - off_to_start, mdp,
1738 is_virtual ? DataLayout::virtual_call_type_data_tag : DataLayout::call_type_data_tag);
1739 z_brne(profile_continue);
1740
1741 if (MethodData::profile_arguments()) {
1742 NearLabel done;
1743 int off_to_args = in_bytes(TypeEntriesAtCall::args_data_offset());
1744 add2reg(mdp, off_to_args);
1745
1746 for (int i = 0; i < TypeProfileArgsLimit; i++) {
1747 if (i > 0 || MethodData::profile_return()) {
1748 // If return value type is profiled we may have no argument to profile.
1749 z_lg(tmp, in_bytes(TypeEntriesAtCall::cell_count_offset())-off_to_args, mdp);
1750 add2reg(tmp, -i*TypeStackSlotEntries::per_arg_count());
1751 compare64_and_branch(tmp, TypeStackSlotEntries::per_arg_count(), Assembler::bcondLow, done);
1752 }
1753 z_lg(tmp, Address(callee, Method::const_offset()));
1754 z_lgh(tmp, Address(tmp, ConstMethod::size_of_parameters_offset()));
1755 // Stack offset o (zero based) from the start of the argument
1756 // list. For n arguments translates into offset n - o - 1 from
1757 // the end of the argument list. But there is an extra slot at
1758 // the top of the stack. So the offset is n - o from Lesp.
1759 z_sg(tmp, Address(mdp, in_bytes(TypeEntriesAtCall::stack_slot_offset(i))-off_to_args));
1760 z_sllg(tmp, tmp, Interpreter::logStackElementSize);
1761 Address stack_slot_addr(tmp, Z_esp);
1762 z_ltg(tmp, stack_slot_addr);
1763
1764 Address mdo_arg_addr(mdp, in_bytes(TypeEntriesAtCall::argument_type_offset(i))-off_to_args);
1765 profile_obj_type(tmp, mdo_arg_addr, tmp, /*ltg did compare to 0*/ true);
1766
1767 int to_add = in_bytes(TypeStackSlotEntries::per_arg_size());
1768 add2reg(mdp, to_add);
1769 off_to_args += to_add;
1770 }
1771
1772 if (MethodData::profile_return()) {
1773 z_lg(tmp, in_bytes(TypeEntriesAtCall::cell_count_offset())-off_to_args, mdp);
1774 add2reg(tmp, -TypeProfileArgsLimit*TypeStackSlotEntries::per_arg_count());
1775 }
1776
1777 bind(done);
1778
1779 if (MethodData::profile_return()) {
1780 // We're right after the type profile for the last
1781 // argument. Tmp is the number of cells left in the
1782 // CallTypeData/VirtualCallTypeData to reach its end. Non null
1783 // if there's a return to profile.
1784 assert(ReturnTypeEntry::static_cell_count() < TypeStackSlotEntries::per_arg_count(), "can't move past ret type");
1785 z_sllg(tmp, tmp, exact_log2(DataLayout::cell_size));
1786 z_agr(mdp, tmp);
1787 }
1788 z_stg(mdp, _z_ijava_state_neg(mdx), Z_fp);
1789 } else {
1790 assert(MethodData::profile_return(), "either profile call args or call ret");
1791 update_mdp_by_constant(mdp, in_bytes(TypeEntriesAtCall::return_only_size()));
1792 }
1793
1794 // Mdp points right after the end of the
1795 // CallTypeData/VirtualCallTypeData, right after the cells for the
1796 // return value type if there's one.
1797 bind(profile_continue);
1798 }
1799 }
1800
1801 void InterpreterMacroAssembler::profile_return_type(Register mdp, Register ret, Register tmp) {
1802 assert_different_registers(mdp, ret, tmp);
1803 if (ProfileInterpreter && MethodData::profile_return()) {
1804 Label profile_continue;
1805
1806 test_method_data_pointer(mdp, profile_continue);
1807
1808 if (MethodData::profile_return_jsr292_only()) {
1809 // If we don't profile all invoke bytecodes we must make sure
1810 // it's a bytecode we indeed profile. We can't go back to the
1811 // beginning of the ProfileData we intend to update to check its
1812 // type because we're right after it and we don't known its
1813 // length.
1814 NearLabel do_profile;
1815 Address bc(Z_bcp);
1816 z_lb(tmp, bc);
1817 compare32_and_branch(tmp, Bytecodes::_invokedynamic, Assembler::bcondEqual, do_profile);
1818 compare32_and_branch(tmp, Bytecodes::_invokehandle, Assembler::bcondEqual, do_profile);
1819 get_method(tmp);
1820 // Supplement to 8139891: _intrinsic_id exceeded 1-byte size limit.
1821 if (Method::intrinsic_id_size_in_bytes() == 1) {
1822 z_cli(in_bytes(Method::intrinsic_id_offset()), tmp, static_cast<int>(vmIntrinsics::_compiledLambdaForm));
1823 } else {
1824 assert(Method::intrinsic_id_size_in_bytes() == 2, "size error: check Method::_intrinsic_id");
1825 z_lh(tmp, in_bytes(Method::intrinsic_id_offset()), Z_R0, tmp);
1826 z_chi(tmp, static_cast<int>(vmIntrinsics::_compiledLambdaForm));
1827 }
1828 z_brne(profile_continue);
1829
1830 bind(do_profile);
1831 }
1832
1833 Address mdo_ret_addr(mdp, -in_bytes(ReturnTypeEntry::size()));
1834 profile_obj_type(ret, mdo_ret_addr, tmp);
1835
1836 bind(profile_continue);
1837 }
1838 }
1839
1840 void InterpreterMacroAssembler::profile_parameters_type(Register mdp, Register tmp1, Register tmp2) {
1841 if (ProfileInterpreter && MethodData::profile_parameters()) {
1842 Label profile_continue, done;
1843
1844 test_method_data_pointer(mdp, profile_continue);
1845
1846 // Load the offset of the area within the MDO used for
1847 // parameters. If it's negative we're not profiling any parameters.
1848 Address parm_di_addr(mdp, in_bytes(MethodData::parameters_type_data_di_offset()) - in_bytes(MethodData::data_offset()));
1849 load_and_test_int2long(tmp1, parm_di_addr);
1850 z_brl(profile_continue);
1851
1852 // Compute a pointer to the area for parameters from the offset
1853 // and move the pointer to the slot for the last
1854 // parameters. Collect profiling from last parameter down.
1855 // mdo start + parameters offset + array length - 1
1856
1857 // Pointer to the parameter area in the MDO.
1858 z_agr(mdp, tmp1);
1859
1860 // Offset of the current profile entry to update.
1861 const Register entry_offset = tmp1;
1862 // entry_offset = array len in number of cells.
1863 z_lg(entry_offset, Address(mdp, ArrayData::array_len_offset()));
1864 // entry_offset (number of cells) = array len - size of 1 entry
1865 add2reg(entry_offset, -TypeStackSlotEntries::per_arg_count());
1866 // entry_offset in bytes
1867 z_sllg(entry_offset, entry_offset, exact_log2(DataLayout::cell_size));
1868
1869 Label loop;
1870 bind(loop);
1871
1872 Address arg_off(mdp, entry_offset, ParametersTypeData::stack_slot_offset(0));
1873 Address arg_type(mdp, entry_offset, ParametersTypeData::type_offset(0));
1874
1875 // Load offset on the stack from the slot for this parameter.
1876 z_lg(tmp2, arg_off);
1877 z_sllg(tmp2, tmp2, Interpreter::logStackElementSize);
1878 z_lcgr(tmp2); // Negate.
1879
1880 // Profile the parameter.
1881 z_ltg(tmp2, Address(Z_locals, tmp2));
1882 profile_obj_type(tmp2, arg_type, tmp2, /*ltg did compare to 0*/ true);
1883
1884 // Go to next parameter.
1885 z_aghi(entry_offset, -TypeStackSlotEntries::per_arg_count() * DataLayout::cell_size);
1886 z_brnl(loop);
1887
1888 bind(profile_continue);
1889 }
1890 }
1891
1892 // Jump if ((*counter_addr += increment) & mask) satisfies the condition.
1893 void InterpreterMacroAssembler::increment_mask_and_jump(Address counter_addr,
1894 int increment,
1895 Address mask,
1896 Register scratch,
1897 bool preloaded,
1898 branch_condition cond,
1899 Label *where) {
1900 assert_different_registers(counter_addr.base(), scratch);
1901 if (preloaded) {
1902 add2reg(scratch, increment);
1903 reg2mem_opt(scratch, counter_addr, false);
1904 } else {
1905 if (VM_Version::has_MemWithImmALUOps() && Immediate::is_simm8(increment) && counter_addr.is_RSYform()) {
1906 z_alsi(counter_addr.disp20(), counter_addr.base(), increment);
1907 mem2reg_signed_opt(scratch, counter_addr);
1908 } else {
1909 mem2reg_signed_opt(scratch, counter_addr);
1910 add2reg(scratch, increment);
1911 reg2mem_opt(scratch, counter_addr, false);
1912 }
1913 }
1914 z_n(scratch, mask);
1915 if (where) { z_brc(cond, *where); }
1916 }
1917
1918 // Get MethodCounters object for given method. Lazily allocated if necessary.
1919 // method - Ptr to Method object.
1920 // Rcounters - Ptr to MethodCounters object associated with Method object.
1921 // skip - Exit point if MethodCounters object can't be created (OOM condition).
1922 void InterpreterMacroAssembler::get_method_counters(Register Rmethod,
1923 Register Rcounters,
1924 Label& skip) {
1925 assert_different_registers(Rmethod, Rcounters);
1926
1927 BLOCK_COMMENT("get MethodCounters object {");
1928
1929 Label has_counters;
1930 load_and_test_long(Rcounters, Address(Rmethod, Method::method_counters_offset()));
1931 z_brnz(has_counters);
1932
1933 call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::build_method_counters), Rmethod);
1934 z_ltgr(Rcounters, Z_RET); // Runtime call returns MethodCounters object.
1935 z_brz(skip); // No MethodCounters, out of memory.
1936
1937 bind(has_counters);
1938
1939 BLOCK_COMMENT("} get MethodCounters object");
1940 }
1941
1942 // Increment invocation counter in MethodCounters object.
1943 // Return (invocation_counter+backedge_counter) as "result" in RctrSum.
1944 // Counter values are all unsigned.
1945 void InterpreterMacroAssembler::increment_invocation_counter(Register Rcounters, Register RctrSum) {
1946 assert(UseCompiler, "incrementing must be useful");
1947 assert_different_registers(Rcounters, RctrSum);
1948
1949 int increment = InvocationCounter::count_increment;
1950 int inv_counter_offset = in_bytes(MethodCounters::invocation_counter_offset() + InvocationCounter::counter_offset());
1951 int be_counter_offset = in_bytes(MethodCounters::backedge_counter_offset() + InvocationCounter::counter_offset());
1952
1953 BLOCK_COMMENT("Increment invocation counter {");
1954
1955 if (VM_Version::has_MemWithImmALUOps() && Immediate::is_simm8(increment)) {
1956 // Increment the invocation counter in place,
1957 // then add the incremented value to the backedge counter.
1958 z_l(RctrSum, be_counter_offset, Rcounters);
1959 z_alsi(inv_counter_offset, Rcounters, increment); // Atomic increment @no extra cost!
1960 z_nilf(RctrSum, InvocationCounter::count_mask_value); // Mask off state bits.
1961 z_al(RctrSum, inv_counter_offset, Z_R0, Rcounters);
1962 } else {
1963 // This path is optimized for low register consumption
1964 // at the cost of somewhat higher operand delays.
1965 // It does not need an extra temp register.
1966
1967 // Update the invocation counter.
1968 z_l(RctrSum, inv_counter_offset, Rcounters);
1969 if (RctrSum == Z_R0) {
1970 z_ahi(RctrSum, increment);
1971 } else {
1972 add2reg(RctrSum, increment);
1973 }
1974 z_st(RctrSum, inv_counter_offset, Rcounters);
1975
1976 // Mask off the state bits.
1977 z_nilf(RctrSum, InvocationCounter::count_mask_value);
1978
1979 // Add the backedge counter to the updated invocation counter to
1980 // form the result.
1981 z_al(RctrSum, be_counter_offset, Z_R0, Rcounters);
1982 }
1983
1984 BLOCK_COMMENT("} Increment invocation counter");
1985
1986 // Note that this macro must leave the backedge_count + invocation_count in Rtmp!
1987 }
1988
1989
1990 // increment backedge counter in MethodCounters object.
1991 // return (invocation_counter+backedge_counter) as "result" in RctrSum
1992 // counter values are all unsigned!
1993 void InterpreterMacroAssembler::increment_backedge_counter(Register Rcounters, Register RctrSum) {
1994 assert(UseCompiler, "incrementing must be useful");
1995 assert_different_registers(Rcounters, RctrSum);
1996
1997 int increment = InvocationCounter::count_increment;
1998 int inv_counter_offset = in_bytes(MethodCounters::invocation_counter_offset() + InvocationCounter::counter_offset());
1999 int be_counter_offset = in_bytes(MethodCounters::backedge_counter_offset() + InvocationCounter::counter_offset());
2000
2001 BLOCK_COMMENT("Increment backedge counter {");
2002
2003 if (VM_Version::has_MemWithImmALUOps() && Immediate::is_simm8(increment)) {
2004 // Increment the invocation counter in place,
2005 // then add the incremented value to the backedge counter.
2006 z_l(RctrSum, inv_counter_offset, Rcounters);
2007 z_alsi(be_counter_offset, Rcounters, increment); // Atomic increment @no extra cost!
2008 z_nilf(RctrSum, InvocationCounter::count_mask_value); // Mask off state bits.
2009 z_al(RctrSum, be_counter_offset, Z_R0, Rcounters);
2010 } else {
2011 // This path is optimized for low register consumption
2012 // at the cost of somewhat higher operand delays.
2013 // It does not need an extra temp register.
2014
2015 // Update the invocation counter.
2016 z_l(RctrSum, be_counter_offset, Rcounters);
2017 if (RctrSum == Z_R0) {
2018 z_ahi(RctrSum, increment);
2019 } else {
2020 add2reg(RctrSum, increment);
2021 }
2022 z_st(RctrSum, be_counter_offset, Rcounters);
2023
2024 // Mask off the state bits.
2025 z_nilf(RctrSum, InvocationCounter::count_mask_value);
2026
2027 // Add the backedge counter to the updated invocation counter to
2028 // form the result.
2029 z_al(RctrSum, inv_counter_offset, Z_R0, Rcounters);
2030 }
2031
2032 BLOCK_COMMENT("} Increment backedge counter");
2033
2034 // Note that this macro must leave the backedge_count + invocation_count in Rtmp!
2035 }
2036
2037 // Add an InterpMonitorElem to stack (see frame_s390.hpp).
2038 void InterpreterMacroAssembler::add_monitor_to_stack(bool stack_is_empty,
2039 Register Rtemp1,
2040 Register Rtemp2,
2041 Register Rtemp3) {
2042
2043 const Register Rcurr_slot = Rtemp1;
2044 const Register Rlimit = Rtemp2;
2045 const jint delta = -frame::interpreter_frame_monitor_size_in_bytes();
2046
2047 assert((delta & LongAlignmentMask) == 0,
2048 "sizeof BasicObjectLock must be even number of doublewords");
2049 assert(2 * wordSize == -delta, "this works only as long as delta == -2*wordSize");
2050 assert(Rcurr_slot != Z_R0, "Register must be usable as base register");
2051 assert_different_registers(Rlimit, Rcurr_slot, Rtemp3);
2052
2053 get_monitors(Rlimit);
2054
2055 // Adjust stack pointer for additional monitor entry.
2056 resize_frame(RegisterOrConstant((intptr_t) delta), Z_fp, false);
2057
2058 if (!stack_is_empty) {
2059 // Must copy stack contents down.
2060 NearLabel next, done;
2061
2062 // Rtemp := addr(Tos), Z_esp is pointing below it!
2063 add2reg(Rcurr_slot, wordSize, Z_esp);
2064
2065 // Nothing to do, if already at monitor area.
2066 compareU64_and_branch(Rcurr_slot, Rlimit, bcondNotLow, done);
2067
2068 bind(next);
2069
2070 // Move one stack slot.
2071 mem2reg_opt(Rtemp3, Address(Rcurr_slot));
2072 reg2mem_opt(Rtemp3, Address(Rcurr_slot, delta));
2073 add2reg(Rcurr_slot, wordSize);
2074 compareU64_and_branch(Rcurr_slot, Rlimit, bcondLow, next); // Are we done?
2075
2076 bind(done);
2077 // Done copying stack.
2078 }
2079
2080 // Adjust expression stack and monitor pointers.
2081 add2reg(Z_esp, delta);
2082 add2reg(Rlimit, delta);
2083 save_monitors(Rlimit);
2084 }
2085
2086 // Note: Index holds the offset in bytes afterwards.
2087 // You can use this to store a new value (with Llocals as the base).
2088 void InterpreterMacroAssembler::access_local_int(Register index, Register dst) {
2089 z_sllg(index, index, LogBytesPerWord);
2090 mem2reg_opt(dst, Address(Z_locals, index), false);
2091 }
2092
2093 void InterpreterMacroAssembler::verify_oop(Register reg, TosState state) {
2094 if (state == atos) { MacroAssembler::verify_oop(reg, FILE_AND_LINE); }
2095 }
2096
2097 // Inline assembly for:
2098 //
2099 // if (thread is in interp_only_mode) {
2100 // InterpreterRuntime::post_method_entry();
2101 // }
2102
2103 void InterpreterMacroAssembler::notify_method_entry() {
2104
2105 // JVMTI
2106 // Whenever JVMTI puts a thread in interp_only_mode, method
2107 // entry/exit events are sent for that thread to track stack
2108 // depth. If it is possible to enter interp_only_mode we add
2109 // the code to check if the event should be sent.
2110 if (JvmtiExport::can_post_interpreter_events()) {
2111 Label jvmti_post_done;
2112 MacroAssembler::load_and_test_int(Z_R0, Address(Z_thread, JavaThread::interp_only_mode_offset()));
2113 z_bre(jvmti_post_done);
2114 call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::post_method_entry));
2115 bind(jvmti_post_done);
2116 }
2117 }
2118
2119 // Inline assembly for:
2120 //
2121 // if (thread is in interp_only_mode) {
2122 // if (!native_method) save result
2123 // InterpreterRuntime::post_method_exit();
2124 // if (!native_method) restore result
2125 // }
2126 // if (DTraceMethodProbes) {
2127 // SharedRuntime::dtrace_method_exit(thread, method);
2128 // }
2129 //
2130 // For native methods their result is stored in z_ijava_state.lresult
2131 // and z_ijava_state.fresult before coming here.
2132 // Java methods have their result stored in the expression stack.
2133 //
2134 // Notice the dependency to frame::interpreter_frame_result().
2135 void InterpreterMacroAssembler::notify_method_exit(bool native_method,
2136 TosState state,
2137 NotifyMethodExitMode mode) {
2138 // JVMTI
2139 // Whenever JVMTI puts a thread in interp_only_mode, method
2140 // entry/exit events are sent for that thread to track stack
2141 // depth. If it is possible to enter interp_only_mode we add
2142 // the code to check if the event should be sent.
2143 if (mode == NotifyJVMTI && JvmtiExport::can_post_interpreter_events()) {
2144 Label jvmti_post_done;
2145 MacroAssembler::load_and_test_int(Z_R0, Address(Z_thread, JavaThread::interp_only_mode_offset()));
2146 z_bre(jvmti_post_done);
2147 if (!native_method) push(state); // see frame::interpreter_frame_result()
2148 call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::post_method_exit));
2149 if (!native_method) pop(state);
2150 bind(jvmti_post_done);
2151 }
2152
2153 #if 0
2154 // Dtrace currently not supported on z/Architecture.
2155 {
2156 SkipIfEqual skip(this, &DTraceMethodProbes, false);
2157 push(state);
2158 get_method(c_rarg1);
2159 call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit),
2160 r15_thread, c_rarg1);
2161 pop(state);
2162 }
2163 #endif
2164 }
2165
2166 void InterpreterMacroAssembler::skip_if_jvmti_mode(Label &Lskip, Register Rscratch) {
2167 if (!JvmtiExport::can_post_interpreter_events()) {
2168 return;
2169 }
2170
2171 load_and_test_int(Rscratch, Address(Z_thread, JavaThread::interp_only_mode_offset()));
2172 z_brnz(Lskip);
2173
2174 }
2175
2176 // Pop the topmost TOP_IJAVA_FRAME and set it's sender_sp as new Z_SP.
2177 // The return pc is loaded into the register return_pc.
2178 //
2179 // Registers updated:
2180 // return_pc - The return pc of the calling frame.
2181 // tmp1, tmp2 - scratch
2182 void InterpreterMacroAssembler::pop_interpreter_frame(Register return_pc, Register tmp1, Register tmp2) {
2183 // F0 Z_SP -> caller_sp (F1's)
2184 // ...
2185 // sender_sp (F1's)
2186 // ...
2187 // F1 Z_fp -> caller_sp (F2's)
2188 // return_pc (Continuation after return from F0.)
2189 // ...
2190 // F2 caller_sp
2191
2192 // Remove F0's activation. Restoring Z_SP to sender_sp reverts modifications
2193 // (a) by a c2i adapter and (b) by generate_fixed_frame().
2194 // In case (a) the new top frame F1 is an unextended compiled frame.
2195 // In case (b) F1 is converted from PARENT_IJAVA_FRAME to TOP_IJAVA_FRAME.
2196
2197 // Case (b) seems to be redundant when returning to a interpreted caller,
2198 // because then the caller's top_frame_sp is installed as sp (see
2199 // TemplateInterpreterGenerator::generate_return_entry_for ()). But
2200 // pop_interpreter_frame() is also used in exception handling and there the
2201 // frame type of the caller is unknown, therefore top_frame_sp cannot be used,
2202 // so it is important that sender_sp is the caller's sp as TOP_IJAVA_FRAME.
2203
2204 Register R_f1_sender_sp = tmp1;
2205 Register R_f2_sp = tmp2;
2206
2207 // First check for the interpreter frame's magic.
2208 asm_assert_ijava_state_magic(R_f2_sp/*tmp*/);
2209 z_lg(R_f2_sp, _z_parent_ijava_frame_abi(callers_sp), Z_fp);
2210 z_lg(R_f1_sender_sp, _z_ijava_state_neg(sender_sp), Z_fp);
2211 if (return_pc->is_valid())
2212 z_lg(return_pc, _z_parent_ijava_frame_abi(return_pc), Z_fp);
2213 // Pop F0 by resizing to R_f1_sender_sp and using R_f2_sp as fp.
2214 resize_frame_absolute(R_f1_sender_sp, R_f2_sp, false/*load fp*/);
2215
2216 #ifdef ASSERT
2217 // The return_pc in the new top frame is dead... at least that's my
2218 // current understanding; to assert this I overwrite it.
2219 load_const_optimized(Z_ARG3, 0xb00b1);
2220 z_stg(Z_ARG3, _z_parent_ijava_frame_abi(return_pc), Z_SP);
2221 #endif
2222 }
2223
2224 void InterpreterMacroAssembler::verify_FPU(int stack_depth, TosState state) {
2225 if (VerifyFPU) {
2226 unimplemented("verifyFPU");
2227 }
2228 }