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
328 // Check if the secondary index definition is still ~x, otherwise
329 // we have to change the following assembler code to calculate the
330 // plain index.
331 assert(ConstantPool::decode_invokedynamic_index(~123) == 123, "else change next line");
332 not_(index); // Convert to plain index.
333 } else if (index_size == sizeof(u1)) {
334 z_llgc(index, param);
335 } else {
336 ShouldNotReachHere();
337 }
338 BLOCK_COMMENT("}");
339 }
340
341 void InterpreterMacroAssembler::load_resolved_indy_entry(Register cache, Register index) {
342 // Get index out of bytecode pointer.
343 get_cache_index_at_bcp(index, 1, sizeof(u4));
344
345 // Get the address of the ResolvedIndyEntry array
346 get_constant_pool_cache(cache);
347 z_lg(cache, Address(cache, in_bytes(ConstantPoolCache::invokedynamic_entries_offset())));
348
349 // Scale the index to form a byte offset into the ResolvedIndyEntry array
350 size_t entry_size = sizeof(ResolvedIndyEntry);
351 if (is_power_of_2(entry_size)) {
352 z_sllg(index, index, exact_log2(entry_size));
353 } else {
354 z_mghi(index, entry_size);
355 }
356
357 // Calculate the final field address.
358 z_la(cache, Array<ResolvedIndyEntry>::base_offset_in_bytes(), index, cache);
359 }
360
361 void InterpreterMacroAssembler::load_field_entry(Register cache, Register index, int bcp_offset) {
362 // Get field index out of bytecode pointer.
363 get_cache_index_at_bcp(index, bcp_offset, sizeof(u2));
364
365 // Get the address of the ResolvedFieldEntry array.
366 get_constant_pool_cache(cache);
367 z_lg(cache, Address(cache, in_bytes(ConstantPoolCache::field_entries_offset())));
368
369 // Scale the index to form a byte offset into the ResolvedFieldEntry array
370 size_t entry_size = sizeof(ResolvedFieldEntry);
371 if (is_power_of_2(entry_size)) {
372 z_sllg(index, index, exact_log2(entry_size));
373 } else {
374 z_mghi(index, entry_size);
375 }
376
377 // Calculate the final field address.
378 z_la(cache, Array<ResolvedFieldEntry>::base_offset_in_bytes(), index, cache);
379 }
380
381 void InterpreterMacroAssembler::load_method_entry(Register cache, Register index, int bcp_offset) {
382 // Get field index out of bytecode pointer.
383 get_cache_index_at_bcp(index, bcp_offset, sizeof(u2));
384
385 // Get the address of the ResolvedMethodEntry array.
386 get_constant_pool_cache(cache);
387 z_lg(cache, Address(cache, in_bytes(ConstantPoolCache::method_entries_offset())));
388
389 // Scale the index to form a byte offset into the ResolvedMethodEntry array
390 size_t entry_size = sizeof(ResolvedMethodEntry);
391 if (is_power_of_2(entry_size)) {
392 z_sllg(index, index, exact_log2(entry_size));
393 } else {
394 z_mghi(index, entry_size);
395 }
396
397 // Calculate the final field address.
398 z_la(cache, Array<ResolvedMethodEntry>::base_offset_in_bytes(), index, cache);
399 }
400
401 // Load object from cpool->resolved_references(index).
402 void InterpreterMacroAssembler::load_resolved_reference_at_index(Register result, Register index) {
403 assert_different_registers(result, index);
404 get_constant_pool(result);
405
406 // Convert
407 // - from field index to resolved_references() index and
408 // - from word index to byte offset.
409 // Since this is a java object, it is potentially compressed.
410 Register tmp = index; // reuse
411 z_sllg(index, index, LogBytesPerHeapOop); // Offset into resolved references array.
412 // Load pointer for resolved_references[] objArray.
413 z_lg(result, in_bytes(ConstantPool::cache_offset()), result);
414 z_lg(result, in_bytes(ConstantPoolCache::resolved_references_offset()), result);
415 resolve_oop_handle(result); // Load resolved references array itself.
416 #ifdef ASSERT
417 NearLabel index_ok;
418 z_lgf(Z_R0, Address(result, arrayOopDesc::length_offset_in_bytes()));
419 z_sllg(Z_R0, Z_R0, LogBytesPerHeapOop);
420 compare64_and_branch(tmp, Z_R0, Assembler::bcondLow, index_ok);
421 stop("resolved reference index out of bounds", 0x09256);
422 bind(index_ok);
423 #endif
424 z_agr(result, index); // Address of indexed array element.
425 load_heap_oop(result, Address(result, arrayOopDesc::base_offset_in_bytes(T_OBJECT)), tmp, noreg);
426 }
427
428 // load cpool->resolved_klass_at(index)
429 void InterpreterMacroAssembler::load_resolved_klass_at_offset(Register cpool, Register offset, Register iklass) {
430 // int value = *(Rcpool->int_at_addr(which));
431 // int resolved_klass_index = extract_low_short_from_int(value);
432 z_llgh(offset, Address(cpool, offset, sizeof(ConstantPool) + 2)); // offset = resolved_klass_index (s390 is big-endian)
433 z_sllg(offset, offset, LogBytesPerWord); // Convert 'index' to 'offset'
434 z_lg(iklass, Address(cpool, ConstantPool::resolved_klasses_offset())); // iklass = cpool->_resolved_klasses
435 z_lg(iklass, Address(iklass, offset, Array<Klass*>::base_offset_in_bytes()));
436 }
437
438 // Generate a subtype check: branch to ok_is_subtype if sub_klass is
439 // a subtype of super_klass. Blows registers Rsuper_klass, Rsub_klass, tmp1, tmp2.
440 void InterpreterMacroAssembler::gen_subtype_check(Register Rsub_klass,
441 Register Rsuper_klass,
442 Register Rtmp1,
443 Register Rtmp2,
444 Label &ok_is_subtype) {
445 // Profile the not-null value's klass.
446 profile_typecheck(Rtmp1, Rsub_klass, Rtmp2);
447
448 // Do the check.
449 check_klass_subtype(Rsub_klass, Rsuper_klass, Rtmp1, Rtmp2, ok_is_subtype);
450 }
451
452 // Pop topmost element from stack. It just disappears.
453 // Useful if consumed previously by access via stackTop().
454 void InterpreterMacroAssembler::popx(int len) {
455 add2reg(Z_esp, len*Interpreter::stackElementSize);
456 debug_only(verify_esp(Z_esp, Z_R1_scratch));
457 }
458
459 // Get Address object of stack top. No checks. No pop.
460 // Purpose: - Provide address of stack operand to exploit reg-mem operations.
461 // - Avoid RISC-like mem2reg - reg-reg-op sequence.
462 Address InterpreterMacroAssembler::stackTop() {
463 return Address(Z_esp, Interpreter::expr_offset_in_bytes(0));
464 }
465
466 void InterpreterMacroAssembler::pop_i(Register r) {
467 z_l(r, Interpreter::expr_offset_in_bytes(0), Z_esp);
468 add2reg(Z_esp, Interpreter::stackElementSize);
469 assert_different_registers(r, Z_R1_scratch);
470 debug_only(verify_esp(Z_esp, Z_R1_scratch));
471 }
472
473 void InterpreterMacroAssembler::pop_ptr(Register r) {
474 z_lg(r, Interpreter::expr_offset_in_bytes(0), Z_esp);
475 add2reg(Z_esp, Interpreter::stackElementSize);
476 assert_different_registers(r, Z_R1_scratch);
477 debug_only(verify_esp(Z_esp, Z_R1_scratch));
478 }
479
480 void InterpreterMacroAssembler::pop_l(Register r) {
481 z_lg(r, Interpreter::expr_offset_in_bytes(0), Z_esp);
482 add2reg(Z_esp, 2*Interpreter::stackElementSize);
483 assert_different_registers(r, Z_R1_scratch);
484 debug_only(verify_esp(Z_esp, Z_R1_scratch));
485 }
486
487 void InterpreterMacroAssembler::pop_f(FloatRegister f) {
488 mem2freg_opt(f, Address(Z_esp, Interpreter::expr_offset_in_bytes(0)), false);
489 add2reg(Z_esp, Interpreter::stackElementSize);
490 debug_only(verify_esp(Z_esp, Z_R1_scratch));
491 }
492
493 void InterpreterMacroAssembler::pop_d(FloatRegister f) {
494 mem2freg_opt(f, Address(Z_esp, Interpreter::expr_offset_in_bytes(0)), true);
495 add2reg(Z_esp, 2*Interpreter::stackElementSize);
496 debug_only(verify_esp(Z_esp, Z_R1_scratch));
497 }
498
499 void InterpreterMacroAssembler::push_i(Register r) {
500 assert_different_registers(r, Z_R1_scratch);
501 debug_only(verify_esp(Z_esp, Z_R1_scratch));
502 z_st(r, Address(Z_esp));
503 add2reg(Z_esp, -Interpreter::stackElementSize);
504 }
505
506 void InterpreterMacroAssembler::push_ptr(Register r) {
507 z_stg(r, Address(Z_esp));
508 add2reg(Z_esp, -Interpreter::stackElementSize);
509 }
510
511 void InterpreterMacroAssembler::push_l(Register r) {
512 assert_different_registers(r, Z_R1_scratch);
513 debug_only(verify_esp(Z_esp, Z_R1_scratch));
514 int offset = -Interpreter::stackElementSize;
515 z_stg(r, Address(Z_esp, offset));
516 clear_mem(Address(Z_esp), Interpreter::stackElementSize);
517 add2reg(Z_esp, 2 * offset);
518 }
519
520 void InterpreterMacroAssembler::push_f(FloatRegister f) {
521 debug_only(verify_esp(Z_esp, Z_R1_scratch));
522 freg2mem_opt(f, Address(Z_esp), false);
523 add2reg(Z_esp, -Interpreter::stackElementSize);
524 }
525
526 void InterpreterMacroAssembler::push_d(FloatRegister d) {
527 debug_only(verify_esp(Z_esp, Z_R1_scratch));
528 int offset = -Interpreter::stackElementSize;
529 freg2mem_opt(d, Address(Z_esp, offset));
530 add2reg(Z_esp, 2 * offset);
531 }
532
533 void InterpreterMacroAssembler::push(TosState state) {
534 verify_oop(Z_tos, state);
535 switch (state) {
536 case atos: push_ptr(); break;
537 case btos: push_i(); break;
538 case ztos:
539 case ctos:
540 case stos: push_i(); break;
541 case itos: push_i(); break;
542 case ltos: push_l(); break;
543 case ftos: push_f(); break;
544 case dtos: push_d(); break;
545 case vtos: /* nothing to do */ break;
546 default : ShouldNotReachHere();
547 }
548 }
549
550 void InterpreterMacroAssembler::pop(TosState state) {
551 switch (state) {
552 case atos: pop_ptr(Z_tos); break;
553 case btos: pop_i(Z_tos); break;
554 case ztos:
555 case ctos:
556 case stos: pop_i(Z_tos); break;
557 case itos: pop_i(Z_tos); break;
558 case ltos: pop_l(Z_tos); break;
559 case ftos: pop_f(Z_ftos); break;
560 case dtos: pop_d(Z_ftos); break;
561 case vtos: /* nothing to do */ break;
562 default : ShouldNotReachHere();
563 }
564 verify_oop(Z_tos, state);
565 }
566
567 // Helpers for swap and dup.
568 void InterpreterMacroAssembler::load_ptr(int n, Register val) {
569 z_lg(val, Address(Z_esp, Interpreter::expr_offset_in_bytes(n)));
570 }
571
572 void InterpreterMacroAssembler::store_ptr(int n, Register val) {
573 z_stg(val, Address(Z_esp, Interpreter::expr_offset_in_bytes(n)));
574 }
575
576 void InterpreterMacroAssembler::prepare_to_jump_from_interpreted(Register method) {
577 // Satisfy interpreter calling convention (see generate_normal_entry()).
578 z_lgr(Z_R10, Z_SP); // Set sender sp (aka initial caller sp, aka unextended sp).
579 // Record top_frame_sp, because the callee might modify it, if it's compiled.
580 z_stg(Z_SP, _z_ijava_state_neg(top_frame_sp), Z_fp);
581 save_bcp();
582 save_esp();
583 z_lgr(Z_method, method); // Set Z_method (kills Z_fp!).
584 }
585
586 // Jump to from_interpreted entry of a call unless single stepping is possible
587 // in this thread in which case we must call the i2i entry.
588 void InterpreterMacroAssembler::jump_from_interpreted(Register method, Register temp) {
589 assert_different_registers(method, Z_R10 /*used for initial_caller_sp*/, temp);
590 prepare_to_jump_from_interpreted(method);
591
592 if (JvmtiExport::can_post_interpreter_events()) {
593 // JVMTI events, such as single-stepping, are implemented partly by avoiding running
594 // compiled code in threads for which the event is enabled. Check here for
595 // interp_only_mode if these events CAN be enabled.
596 z_lg(Z_R1_scratch, Address(method, Method::from_interpreted_offset()));
597 MacroAssembler::load_and_test_int(Z_R0_scratch, Address(Z_thread, JavaThread::interp_only_mode_offset()));
598 z_bcr(bcondEqual, Z_R1_scratch); // Run compiled code if zero.
599 // Run interpreted.
600 z_lg(Z_R1_scratch, Address(method, Method::interpreter_entry_offset()));
601 z_br(Z_R1_scratch);
602 } else {
603 // Run compiled code.
604 z_lg(Z_R1_scratch, Address(method, Method::from_interpreted_offset()));
605 z_br(Z_R1_scratch);
606 }
607 }
608
609 #ifdef ASSERT
610 void InterpreterMacroAssembler::verify_esp(Register Resp, Register Rtemp) {
611 // About to read or write Resp[0].
612 // Make sure it is not in the monitors or the TOP_IJAVA_FRAME_ABI.
613 address reentry = nullptr;
614
615 {
616 // Check if the frame pointer in Z_fp is correct.
617 NearLabel OK;
618 z_cg(Z_fp, 0, Z_SP);
619 z_bre(OK);
620 reentry = stop_chain_static(reentry, "invalid frame pointer Z_fp");
621 bind(OK);
622 }
623 {
624 // Resp must not point into or below the operand stack,
625 // i.e. IJAVA_STATE.monitors > Resp.
626 NearLabel OK;
627 Register Rmonitors = Rtemp;
628 z_lg(Rmonitors, _z_ijava_state_neg(monitors), Z_fp);
629 compareU64_and_branch(Rmonitors, Resp, bcondHigh, OK);
630 reentry = stop_chain_static(reentry, "too many pops: Z_esp points into monitor area");
631 bind(OK);
632 }
633 {
634 // Resp may point to the last word of TOP_IJAVA_FRAME_ABI, but not below
635 // i.e. !(Z_SP + frame::z_top_ijava_frame_abi_size - Interpreter::stackElementSize > Resp).
636 NearLabel OK;
637 Register Rabi_bottom = Rtemp;
638 add2reg(Rabi_bottom, frame::z_top_ijava_frame_abi_size - Interpreter::stackElementSize, Z_SP);
639 compareU64_and_branch(Rabi_bottom, Resp, bcondNotHigh, OK);
640 reentry = stop_chain_static(reentry, "too many pushes: Z_esp points into TOP_IJAVA_FRAME_ABI");
641 bind(OK);
642 }
643 }
644
645 void InterpreterMacroAssembler::asm_assert_ijava_state_magic(Register tmp) {
646 Label magic_ok;
647 load_const_optimized(tmp, frame::z_istate_magic_number);
648 z_cg(tmp, Address(Z_fp, _z_ijava_state_neg(magic)));
649 z_bre(magic_ok);
650 stop_static("error: wrong magic number in ijava_state access");
651 bind(magic_ok);
652 }
653 #endif // ASSERT
654
655 void InterpreterMacroAssembler::save_bcp() {
656 z_stg(Z_bcp, Address(Z_fp, _z_ijava_state_neg(bcp)));
657 asm_assert_ijava_state_magic(Z_bcp);
658 NOT_PRODUCT(z_lg(Z_bcp, Address(Z_fp, _z_ijava_state_neg(bcp))));
659 }
660
661 void InterpreterMacroAssembler::restore_bcp() {
662 asm_assert_ijava_state_magic(Z_bcp);
663 z_lg(Z_bcp, Address(Z_fp, _z_ijava_state_neg(bcp)));
664 }
665
666 void InterpreterMacroAssembler::save_esp() {
667 z_stg(Z_esp, Address(Z_fp, _z_ijava_state_neg(esp)));
668 }
669
670 void InterpreterMacroAssembler::restore_esp() {
671 asm_assert_ijava_state_magic(Z_esp);
672 z_lg(Z_esp, Address(Z_fp, _z_ijava_state_neg(esp)));
673 }
674
675 void InterpreterMacroAssembler::get_monitors(Register reg) {
676 asm_assert_ijava_state_magic(reg);
677 mem2reg_opt(reg, Address(Z_fp, _z_ijava_state_neg(monitors)));
678 }
679
680 void InterpreterMacroAssembler::save_monitors(Register reg) {
681 reg2mem_opt(reg, Address(Z_fp, _z_ijava_state_neg(monitors)));
682 }
683
684 void InterpreterMacroAssembler::get_mdp(Register mdp) {
685 z_lg(mdp, _z_ijava_state_neg(mdx), Z_fp);
686 }
687
688 void InterpreterMacroAssembler::save_mdp(Register mdp) {
689 z_stg(mdp, _z_ijava_state_neg(mdx), Z_fp);
690 }
691
692 // Values that are only read (besides initialization).
693 void InterpreterMacroAssembler::restore_locals() {
694 asm_assert_ijava_state_magic(Z_locals);
695 z_lg(Z_locals, Address(Z_fp, _z_ijava_state_neg(locals)));
696 }
697
698 void InterpreterMacroAssembler::get_method(Register reg) {
699 asm_assert_ijava_state_magic(reg);
700 z_lg(reg, Address(Z_fp, _z_ijava_state_neg(method)));
701 }
702
703 void InterpreterMacroAssembler::get_2_byte_integer_at_bcp(Register Rdst, int bcp_offset,
704 signedOrNot is_signed) {
705 // Rdst is an 8-byte return value!!!
706
707 // Unaligned loads incur only a small penalty on z/Architecture. The penalty
708 // is a few (2..3) ticks, even when the load crosses a cache line
709 // boundary. In case of a cache miss, the stall could, of course, be
710 // much longer.
711
712 switch (is_signed) {
713 case Signed:
714 z_lgh(Rdst, bcp_offset, Z_R0, Z_bcp);
715 break;
716 case Unsigned:
717 z_llgh(Rdst, bcp_offset, Z_R0, Z_bcp);
718 break;
719 default:
720 ShouldNotReachHere();
721 }
722 }
723
724
725 void InterpreterMacroAssembler::get_4_byte_integer_at_bcp(Register Rdst, int bcp_offset,
726 setCCOrNot set_cc) {
727 // Rdst is an 8-byte return value!!!
728
729 // Unaligned loads incur only a small penalty on z/Architecture. The penalty
730 // is a few (2..3) ticks, even when the load crosses a cache line
731 // boundary. In case of a cache miss, the stall could, of course, be
732 // much longer.
733
734 // Both variants implement a sign-extending int2long load.
735 if (set_cc == set_CC) {
736 load_and_test_int2long(Rdst, Address(Z_bcp, (intptr_t)bcp_offset));
737 } else {
738 mem2reg_signed_opt( Rdst, Address(Z_bcp, (intptr_t)bcp_offset));
739 }
740 }
741
742 void InterpreterMacroAssembler::get_constant_pool(Register Rdst) {
743 get_method(Rdst);
744 mem2reg_opt(Rdst, Address(Rdst, Method::const_offset()));
745 mem2reg_opt(Rdst, Address(Rdst, ConstMethod::constants_offset()));
746 }
747
748 void InterpreterMacroAssembler::get_constant_pool_cache(Register Rdst) {
749 get_constant_pool(Rdst);
750 mem2reg_opt(Rdst, Address(Rdst, ConstantPool::cache_offset()));
751 }
752
753 void InterpreterMacroAssembler::get_cpool_and_tags(Register Rcpool, Register Rtags) {
754 get_constant_pool(Rcpool);
755 mem2reg_opt(Rtags, Address(Rcpool, ConstantPool::tags_offset()));
756 }
757
758 // Unlock if synchronized method.
759 //
760 // Unlock the receiver if this is a synchronized method.
761 // Unlock any Java monitors from synchronized blocks.
762 //
763 // If there are locked Java monitors
764 // If throw_monitor_exception
765 // throws IllegalMonitorStateException
766 // Else if install_monitor_exception
767 // installs IllegalMonitorStateException
768 // Else
769 // no error processing
770 void InterpreterMacroAssembler::unlock_if_synchronized_method(TosState state,
771 bool throw_monitor_exception,
772 bool install_monitor_exception) {
773 NearLabel unlocked, unlock, no_unlock;
774
775 {
776 Register R_method = Z_ARG2;
777 Register R_do_not_unlock_if_synchronized = Z_ARG3;
778
779 // Get the value of _do_not_unlock_if_synchronized into G1_scratch.
780 const Address do_not_unlock_if_synchronized(Z_thread,
781 JavaThread::do_not_unlock_if_synchronized_offset());
782 load_sized_value(R_do_not_unlock_if_synchronized, do_not_unlock_if_synchronized, 1, false /*unsigned*/);
783 z_mvi(do_not_unlock_if_synchronized, false); // Reset the flag.
784
785 // Check if synchronized method.
786 get_method(R_method);
787 verify_oop(Z_tos, state);
788 push(state); // Save tos/result.
789 testbit(method2_(R_method, access_flags), JVM_ACC_SYNCHRONIZED_BIT);
790 z_bfalse(unlocked);
791
792 // Don't unlock anything if the _do_not_unlock_if_synchronized flag
793 // is set.
794 compareU64_and_branch(R_do_not_unlock_if_synchronized, (intptr_t)0L, bcondNotEqual, no_unlock);
795 }
796
797 // unlock monitor
798
799 // BasicObjectLock will be first in list, since this is a
800 // synchronized method. However, need to check that the object has
801 // not been unlocked by an explicit monitorexit bytecode.
802 const Address monitor(Z_fp, -(frame::z_ijava_state_size + (int) sizeof(BasicObjectLock)));
803 // We use Z_ARG2 so that if we go slow path it will be the correct
804 // register for unlock_object to pass to VM directly.
805 load_address(Z_ARG2, monitor); // Address of first monitor.
806 z_lg(Z_ARG3, Address(Z_ARG2, BasicObjectLock::obj_offset()));
807 compareU64_and_branch(Z_ARG3, (intptr_t)0L, bcondNotEqual, unlock);
808
809 if (throw_monitor_exception) {
810 // Entry already unlocked need to throw an exception.
811 MacroAssembler::call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_illegal_monitor_state_exception));
812 should_not_reach_here();
813 } else {
814 // Monitor already unlocked during a stack unroll.
815 // If requested, install an illegal_monitor_state_exception.
816 // Continue with stack unrolling.
817 if (install_monitor_exception) {
818 MacroAssembler::call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::new_illegal_monitor_state_exception));
819 }
820 z_bru(unlocked);
821 }
822
823 bind(unlock);
824
825 unlock_object(Z_ARG2);
826
827 bind(unlocked);
828
829 // I0, I1: Might contain return value
830
831 // Check that all monitors are unlocked.
832 {
833 NearLabel loop, exception, entry, restart;
834 const int entry_size = frame::interpreter_frame_monitor_size_in_bytes();
835 // We use Z_ARG2 so that if we go slow path it will be the correct
836 // register for unlock_object to pass to VM directly.
837 Register R_current_monitor = Z_ARG2;
838 Register R_monitor_block_bot = Z_ARG1;
839 const Address monitor_block_top(Z_fp, _z_ijava_state_neg(monitors));
840 const Address monitor_block_bot(Z_fp, -frame::z_ijava_state_size);
841
842 bind(restart);
843 // Starting with top-most entry.
844 z_lg(R_current_monitor, monitor_block_top);
845 // Points to word before bottom of monitor block.
846 load_address(R_monitor_block_bot, monitor_block_bot);
847 z_bru(entry);
848
849 // Entry already locked, need to throw exception.
850 bind(exception);
851
852 if (throw_monitor_exception) {
853 // Throw exception.
854 MacroAssembler::call_VM(noreg,
855 CAST_FROM_FN_PTR(address, InterpreterRuntime::
856 throw_illegal_monitor_state_exception));
857 should_not_reach_here();
858 } else {
859 // Stack unrolling. Unlock object and install illegal_monitor_exception.
860 // Unlock does not block, so don't have to worry about the frame.
861 // We don't have to preserve c_rarg1 since we are going to throw an exception.
862 unlock_object(R_current_monitor);
863 if (install_monitor_exception) {
864 call_VM(noreg, CAST_FROM_FN_PTR(address,
865 InterpreterRuntime::
866 new_illegal_monitor_state_exception));
867 }
868 z_bru(restart);
869 }
870
871 bind(loop);
872 // Check if current entry is used.
873 load_and_test_long(Z_R0_scratch, Address(R_current_monitor, BasicObjectLock::obj_offset()));
874 z_brne(exception);
875
876 add2reg(R_current_monitor, entry_size); // Otherwise advance to next entry.
877 bind(entry);
878 compareU64_and_branch(R_current_monitor, R_monitor_block_bot, bcondNotEqual, loop);
879 }
880
881 bind(no_unlock);
882 pop(state);
883 verify_oop(Z_tos, state);
884 }
885
886 void InterpreterMacroAssembler::narrow(Register result, Register ret_type) {
887 get_method(ret_type);
888 z_lg(ret_type, Address(ret_type, in_bytes(Method::const_offset())));
889 z_lb(ret_type, Address(ret_type, in_bytes(ConstMethod::result_type_offset())));
890
891 Label notBool, notByte, notChar, done;
892
893 // common case first
894 compareU32_and_branch(ret_type, T_INT, bcondEqual, done);
895
896 compareU32_and_branch(ret_type, T_BOOLEAN, bcondNotEqual, notBool);
897 z_nilf(result, 0x1);
898 z_bru(done);
899
900 bind(notBool);
901 compareU32_and_branch(ret_type, T_BYTE, bcondNotEqual, notByte);
902 z_lbr(result, result);
903 z_bru(done);
904
905 bind(notByte);
906 compareU32_and_branch(ret_type, T_CHAR, bcondNotEqual, notChar);
907 z_nilf(result, 0xffff);
908 z_bru(done);
909
910 bind(notChar);
911 // compareU32_and_branch(ret_type, T_SHORT, bcondNotEqual, notShort);
912 z_lhr(result, result);
913
914 // Nothing to do for T_INT
915 bind(done);
916 }
917
918 // remove activation
919 //
920 // Unlock the receiver if this is a synchronized method.
921 // Unlock any Java monitors from synchronized blocks.
922 // Remove the activation from the stack.
923 //
924 // If there are locked Java monitors
925 // If throw_monitor_exception
926 // throws IllegalMonitorStateException
927 // Else if install_monitor_exception
928 // installs IllegalMonitorStateException
929 // Else
930 // no error processing
931 void InterpreterMacroAssembler::remove_activation(TosState state,
932 Register return_pc,
933 bool throw_monitor_exception,
934 bool install_monitor_exception,
935 bool notify_jvmti) {
936 BLOCK_COMMENT("remove_activation {");
937 unlock_if_synchronized_method(state, throw_monitor_exception, install_monitor_exception);
938
939 // Save result (push state before jvmti call and pop it afterwards) and notify jvmti.
940 notify_method_exit(false, state, notify_jvmti ? NotifyJVMTI : SkipNotifyJVMTI);
941
942 if (StackReservedPages > 0) {
943 BLOCK_COMMENT("reserved_stack_check:");
944 // Test if reserved zone needs to be enabled.
945 Label no_reserved_zone_enabling;
946
947 // check if already enabled - if so no re-enabling needed
948 assert(sizeof(StackOverflow::StackGuardState) == 4, "unexpected size");
949 z_ly(Z_R0, Address(Z_thread, JavaThread::stack_guard_state_offset()));
950 compare32_and_branch(Z_R0, StackOverflow::stack_guard_enabled, bcondEqual, no_reserved_zone_enabling);
951
952 // Compare frame pointers. There is no good stack pointer, as with stack
953 // frame compression we can get different SPs when we do calls. A subsequent
954 // call could have a smaller SP, so that this compare succeeds for an
955 // inner call of the method annotated with ReservedStack.
956 z_lg(Z_R0, Address(Z_SP, (intptr_t)_z_abi(callers_sp)));
957 z_clg(Z_R0, Address(Z_thread, JavaThread::reserved_stack_activation_offset())); // Compare with frame pointer in memory.
958 z_brl(no_reserved_zone_enabling);
959
960 // Enable reserved zone again, throw stack overflow exception.
961 call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::enable_stack_reserved_zone), Z_thread);
962 call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_delayed_StackOverflowError));
963
964 should_not_reach_here();
965
966 bind(no_reserved_zone_enabling);
967 }
968
969 verify_oop(Z_tos, state);
970
971 pop_interpreter_frame(return_pc, Z_ARG2, Z_ARG3);
972 BLOCK_COMMENT("} remove_activation");
973 }
974
975 // lock object
976 //
977 // Registers alive
978 // monitor (Z_R10) - Address of the BasicObjectLock to be used for locking,
979 // which must be initialized with the object to lock.
980 // object (Z_R11, Z_R2) - Address of the object to be locked.
981 // templateTable (monitorenter) is using Z_R2 for object
982 void InterpreterMacroAssembler::lock_object(Register monitor, Register object) {
983
984 if (LockingMode == LM_MONITOR) {
985 call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorenter), monitor);
986 return;
987 }
988
989 // template code: (for LM_LEGACY)
990 //
991 // markWord displaced_header = obj->mark().set_unlocked();
992 // monitor->lock()->set_displaced_header(displaced_header);
993 // if (Atomic::cmpxchg(/*addr*/obj->mark_addr(), /*cmp*/displaced_header, /*ex=*/monitor) == displaced_header) {
994 // // We stored the monitor address into the object's mark word.
995 // } else if (THREAD->is_lock_owned((address)displaced_header))
996 // // Simple recursive case.
997 // monitor->lock()->set_displaced_header(nullptr);
998 // } else {
999 // // Slow path.
1000 // InterpreterRuntime::monitorenter(THREAD, monitor);
1001 // }
1002
1003 const int hdr_offset = oopDesc::mark_offset_in_bytes();
1004
1005 const Register header = Z_ARG5;
1006 const Register object_mark_addr = Z_ARG4;
1007 const Register current_header = Z_ARG5;
1008 const Register tmp = Z_R1_scratch;
1009
1010 NearLabel done, slow_case;
1011
1012 // markWord header = obj->mark().set_unlocked();
1013
1014 // Load markWord from object into header.
1015 z_lg(header, hdr_offset, object);
1016
1017 if (DiagnoseSyncOnValueBasedClasses != 0) {
1018 load_klass(tmp, object);
1019 testbit(Address(tmp, Klass::access_flags_offset()), exact_log2(JVM_ACC_IS_VALUE_BASED_CLASS));
1020 z_btrue(slow_case);
1021 }
1022
1023 if (LockingMode == LM_LIGHTWEIGHT) {
1024 lightweight_lock(object, /* mark word */ header, tmp, slow_case);
1025 } else if (LockingMode == LM_LEGACY) {
1026
1027 // Set header to be (markWord of object | UNLOCK_VALUE).
1028 // This will not change anything if it was unlocked before.
1029 z_oill(header, markWord::unlocked_value);
1030
1031 // monitor->lock()->set_displaced_header(displaced_header);
1032 const int lock_offset = in_bytes(BasicObjectLock::lock_offset());
1033 const int mark_offset = lock_offset + BasicLock::displaced_header_offset_in_bytes();
1034
1035 // Initialize the box (Must happen before we update the object mark!).
1036 z_stg(header, mark_offset, monitor);
1037
1038 // if (Atomic::cmpxchg(/*addr*/obj->mark_addr(), /*cmp*/displaced_header, /*ex=*/monitor) == displaced_header) {
1039
1040 // not necessary, use offset in instruction directly.
1041 // add2reg(object_mark_addr, hdr_offset, object);
1042
1043 // Store stack address of the BasicObjectLock (this is monitor) into object.
1044 z_csg(header, monitor, hdr_offset, object);
1045 assert(current_header == header,
1046 "must be same register"); // Identified two registers from z/Architecture.
1047
1048 z_bre(done);
1049
1050 // } else if (THREAD->is_lock_owned((address)displaced_header))
1051 // // Simple recursive case.
1052 // monitor->lock()->set_displaced_header(nullptr);
1053
1054 // We did not see an unlocked object so try the fast recursive case.
1055
1056 // Check if owner is self by comparing the value in the markWord of object
1057 // (current_header) with the stack pointer.
1058 z_sgr(current_header, Z_SP);
1059
1060 assert(os::vm_page_size() > 0xfff, "page size too small - change the constant");
1061
1062 // The prior sequence "LGR, NGR, LTGR" can be done better
1063 // (Z_R1 is temp and not used after here).
1064 load_const_optimized(Z_R0, (~(os::vm_page_size() - 1) | markWord::lock_mask_in_place));
1065 z_ngr(Z_R0, current_header); // AND sets CC (result eq/ne 0)
1066
1067 // If condition is true we are done and hence we can store 0 in the displaced
1068 // header indicating it is a recursive lock and be done.
1069 z_brne(slow_case);
1070 z_release(); // Member unnecessary on zarch AND because the above csg does a sync before and after.
1071 z_stg(Z_R0/*==0!*/, mark_offset, monitor);
1072 }
1073 z_bru(done);
1074 // } else {
1075 // // Slow path.
1076 // InterpreterRuntime::monitorenter(THREAD, monitor);
1077
1078 // None of the above fast optimizations worked so we have to get into the
1079 // slow case of monitor enter.
1080 bind(slow_case);
1081 if (LockingMode == LM_LIGHTWEIGHT) {
1082 // for lightweight locking we need to use monitorenter_obj, see interpreterRuntime.cpp
1083 call_VM(noreg,
1084 CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorenter_obj),
1085 object);
1086 } else {
1087 call_VM(noreg,
1088 CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorenter),
1089 monitor);
1090 }
1091 // }
1092
1093 bind(done);
1094 }
1095
1096 // Unlocks an object. Used in monitorexit bytecode and remove_activation.
1097 //
1098 // Registers alive
1099 // monitor - address of the BasicObjectLock to be used for locking,
1100 // which must be initialized with the object to lock.
1101 //
1102 // Throw IllegalMonitorException if object is not locked by current thread.
1103 void InterpreterMacroAssembler::unlock_object(Register monitor, Register object) {
1104
1105 if (LockingMode == LM_MONITOR) {
1106 call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorexit), monitor);
1107 return;
1108 }
1109
1110 // else {
1111 // template code: (for LM_LEGACY):
1112 //
1113 // if ((displaced_header = monitor->displaced_header()) == nullptr) {
1114 // // Recursive unlock. Mark the monitor unlocked by setting the object field to null.
1115 // monitor->set_obj(nullptr);
1116 // } else if (Atomic::cmpxchg(obj->mark_addr(), monitor, displaced_header) == monitor) {
1117 // // We swapped the unlocked mark in displaced_header into the object's mark word.
1118 // monitor->set_obj(nullptr);
1119 // } else {
1120 // // Slow path.
1121 // InterpreterRuntime::monitorexit(monitor);
1122 // }
1123
1124 const int hdr_offset = oopDesc::mark_offset_in_bytes();
1125
1126 const Register header = Z_ARG4;
1127 const Register current_header = Z_R1_scratch;
1128 Address obj_entry(monitor, BasicObjectLock::obj_offset());
1129 Label done, slow_case;
1130
1131 if (object == noreg) {
1132 // In the template interpreter, we must assure that the object
1133 // entry in the monitor is cleared on all paths. Thus we move
1134 // loading up to here, and clear the entry afterwards.
1135 object = Z_ARG3; // Use Z_ARG3 if caller didn't pass object.
1136 z_lg(object, obj_entry);
1137 }
1138
1139 assert_different_registers(monitor, object, header, current_header);
1140
1141 // if ((displaced_header = monitor->displaced_header()) == nullptr) {
1142 // // Recursive unlock. Mark the monitor unlocked by setting the object field to null.
1143 // monitor->set_obj(nullptr);
1144
1145 // monitor->lock()->set_displaced_header(displaced_header);
1146 const int lock_offset = in_bytes(BasicObjectLock::lock_offset());
1147 const int mark_offset = lock_offset + BasicLock::displaced_header_offset_in_bytes();
1148
1149 clear_mem(obj_entry, sizeof(oop));
1150 if (LockingMode != LM_LIGHTWEIGHT) {
1151 // Test first if we are in the fast recursive case.
1152 MacroAssembler::load_and_test_long(header, Address(monitor, mark_offset));
1153 z_bre(done); // header == 0 -> goto done
1154 }
1155
1156 // } else if (Atomic::cmpxchg(obj->mark_addr(), monitor, displaced_header) == monitor) {
1157 // // We swapped the unlocked mark in displaced_header into the object's mark word.
1158 // monitor->set_obj(nullptr);
1159
1160 // If we still have a lightweight lock, unlock the object and be done.
1161 if (LockingMode == LM_LIGHTWEIGHT) {
1162 // Check for non-symmetric locking. This is allowed by the spec and the interpreter
1163 // must handle it.
1164
1165 Register tmp = current_header;
1166
1167 // First check for lock-stack underflow.
1168 z_lgf(tmp, Address(Z_thread, JavaThread::lock_stack_top_offset()));
1169 compareU32_and_branch(tmp, (unsigned)LockStack::start_offset(), Assembler::bcondNotHigh, slow_case);
1170
1171 // Then check if the top of the lock-stack matches the unlocked object.
1172 z_aghi(tmp, -oopSize);
1173 z_lg(tmp, Address(Z_thread, tmp));
1174 compare64_and_branch(tmp, object, Assembler::bcondNotEqual, slow_case);
1175
1176 z_lg(header, Address(object, hdr_offset));
1177 z_lgr(tmp, header);
1178 z_nill(tmp, markWord::monitor_value);
1179 z_brne(slow_case);
1180
1181 lightweight_unlock(object, header, tmp, slow_case);
1182
1183 z_bru(done);
1184 } else {
1185 // The markword is expected to be at offset 0.
1186 // This is not required on s390, at least not here.
1187 assert(hdr_offset == 0, "unlock_object: review code below");
1188
1189 // We have the displaced header in header. If the lock is still
1190 // lightweight, it will contain the monitor address and we'll store the
1191 // displaced header back into the object's mark word.
1192 z_lgr(current_header, monitor);
1193 z_csg(current_header, header, hdr_offset, object);
1194 z_bre(done);
1195 }
1196
1197 // } else {
1198 // // Slow path.
1199 // InterpreterRuntime::monitorexit(monitor);
1200
1201 // The lock has been converted into a heavy lock and hence
1202 // we need to get into the slow case.
1203 bind(slow_case);
1204 z_stg(object, obj_entry); // Restore object entry, has been cleared above.
1205 call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::monitorexit), monitor);
1206
1207 // }
1208
1209 bind(done);
1210 }
1211
1212 void InterpreterMacroAssembler::test_method_data_pointer(Register mdp, Label& zero_continue) {
1213 assert(ProfileInterpreter, "must be profiling interpreter");
1214 load_and_test_long(mdp, Address(Z_fp, _z_ijava_state_neg(mdx)));
1215 z_brz(zero_continue);
1216 }
1217
1218 // Set the method data pointer for the current bcp.
1219 void InterpreterMacroAssembler::set_method_data_pointer_for_bcp() {
1220 assert(ProfileInterpreter, "must be profiling interpreter");
1221 Label set_mdp;
1222 Register mdp = Z_ARG4;
1223 Register method = Z_ARG5;
1224
1225 get_method(method);
1226 // Test MDO to avoid the call if it is null.
1227 load_and_test_long(mdp, method2_(method, method_data));
1228 z_brz(set_mdp);
1229
1230 call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::bcp_to_di), method, Z_bcp);
1231 // Z_RET: mdi
1232 // Mdo is guaranteed to be non-zero here, we checked for it before the call.
1233 assert(method->is_nonvolatile(), "choose nonvolatile reg or reload from frame");
1234 z_lg(mdp, method2_(method, method_data)); // Must reload, mdp is volatile reg.
1235 add2reg_with_index(mdp, in_bytes(MethodData::data_offset()), Z_RET, mdp);
1236
1237 bind(set_mdp);
1238 save_mdp(mdp);
1239 }
1240
1241 void InterpreterMacroAssembler::verify_method_data_pointer() {
1242 assert(ProfileInterpreter, "must be profiling interpreter");
1243 #ifdef ASSERT
1244 NearLabel verify_continue;
1245 Register bcp_expected = Z_ARG3;
1246 Register mdp = Z_ARG4;
1247 Register method = Z_ARG5;
1248
1249 test_method_data_pointer(mdp, verify_continue); // If mdp is zero, continue
1250 get_method(method);
1251
1252 // If the mdp is valid, it will point to a DataLayout header which is
1253 // consistent with the bcp. The converse is highly probable also.
1254 load_sized_value(bcp_expected, Address(mdp, DataLayout::bci_offset()), 2, false /*signed*/);
1255 z_ag(bcp_expected, Address(method, Method::const_offset()));
1256 load_address(bcp_expected, Address(bcp_expected, ConstMethod::codes_offset()));
1257 compareU64_and_branch(bcp_expected, Z_bcp, bcondEqual, verify_continue);
1258 call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::verify_mdp), method, Z_bcp, mdp);
1259 bind(verify_continue);
1260 #endif // ASSERT
1261 }
1262
1263 void InterpreterMacroAssembler::set_mdp_data_at(Register mdp_in, int constant, Register value) {
1264 assert(ProfileInterpreter, "must be profiling interpreter");
1265 z_stg(value, constant, mdp_in);
1266 }
1267
1268 void InterpreterMacroAssembler::increment_mdp_data_at(Register mdp_in,
1269 int constant,
1270 Register tmp,
1271 bool decrement) {
1272 assert_different_registers(mdp_in, tmp);
1273 // counter address
1274 Address data(mdp_in, constant);
1275 const int delta = decrement ? -DataLayout::counter_increment : DataLayout::counter_increment;
1276 add2mem_64(Address(mdp_in, constant), delta, tmp);
1277 }
1278
1279 void InterpreterMacroAssembler::set_mdp_flag_at(Register mdp_in,
1280 int flag_byte_constant) {
1281 assert(ProfileInterpreter, "must be profiling interpreter");
1282 // Set the flag.
1283 z_oi(Address(mdp_in, DataLayout::flags_offset()), flag_byte_constant);
1284 }
1285
1286 void InterpreterMacroAssembler::test_mdp_data_at(Register mdp_in,
1287 int offset,
1288 Register value,
1289 Register test_value_out,
1290 Label& not_equal_continue) {
1291 assert(ProfileInterpreter, "must be profiling interpreter");
1292 if (test_value_out == noreg) {
1293 z_cg(value, Address(mdp_in, offset));
1294 z_brne(not_equal_continue);
1295 } else {
1296 // Put the test value into a register, so caller can use it:
1297 z_lg(test_value_out, Address(mdp_in, offset));
1298 compareU64_and_branch(test_value_out, value, bcondNotEqual, not_equal_continue);
1299 }
1300 }
1301
1302 void InterpreterMacroAssembler::update_mdp_by_offset(Register mdp_in, int offset_of_disp) {
1303 update_mdp_by_offset(mdp_in, noreg, offset_of_disp);
1304 }
1305
1306 void InterpreterMacroAssembler::update_mdp_by_offset(Register mdp_in,
1307 Register dataidx,
1308 int offset_of_disp) {
1309 assert(ProfileInterpreter, "must be profiling interpreter");
1310 Address disp_address(mdp_in, dataidx, offset_of_disp);
1311 Assembler::z_ag(mdp_in, disp_address);
1312 save_mdp(mdp_in);
1313 }
1314
1315 void InterpreterMacroAssembler::update_mdp_by_constant(Register mdp_in, int constant) {
1316 assert(ProfileInterpreter, "must be profiling interpreter");
1317 add2reg(mdp_in, constant);
1318 save_mdp(mdp_in);
1319 }
1320
1321 void InterpreterMacroAssembler::update_mdp_for_ret(Register return_bci) {
1322 assert(ProfileInterpreter, "must be profiling interpreter");
1323 assert(return_bci->is_nonvolatile(), "choose nonvolatile reg or save/restore");
1324 call_VM(noreg,
1325 CAST_FROM_FN_PTR(address, InterpreterRuntime::update_mdp_for_ret),
1326 return_bci);
1327 }
1328
1329 void InterpreterMacroAssembler::profile_taken_branch(Register mdp, Register bumped_count) {
1330 if (ProfileInterpreter) {
1331 Label profile_continue;
1332
1333 // If no method data exists, go to profile_continue.
1334 // Otherwise, assign to mdp.
1335 test_method_data_pointer(mdp, profile_continue);
1336
1337 // We are taking a branch. Increment the taken count.
1338 // We inline increment_mdp_data_at to return bumped_count in a register
1339 //increment_mdp_data_at(mdp, in_bytes(JumpData::taken_offset()));
1340 Address data(mdp, JumpData::taken_offset());
1341 z_lg(bumped_count, data);
1342 // 64-bit overflow is very unlikely. Saturation to 32-bit values is
1343 // performed when reading the counts.
1344 add2reg(bumped_count, DataLayout::counter_increment);
1345 z_stg(bumped_count, data); // Store back out
1346
1347 // The method data pointer needs to be updated to reflect the new target.
1348 update_mdp_by_offset(mdp, in_bytes(JumpData::displacement_offset()));
1349 bind(profile_continue);
1350 }
1351 }
1352
1353 // Kills Z_R1_scratch.
1354 void InterpreterMacroAssembler::profile_not_taken_branch(Register mdp) {
1355 if (ProfileInterpreter) {
1356 Label profile_continue;
1357
1358 // If no method data exists, go to profile_continue.
1359 test_method_data_pointer(mdp, profile_continue);
1360
1361 // We are taking a branch. Increment the not taken count.
1362 increment_mdp_data_at(mdp, in_bytes(BranchData::not_taken_offset()), Z_R1_scratch);
1363
1364 // The method data pointer needs to be updated to correspond to
1365 // the next bytecode.
1366 update_mdp_by_constant(mdp, in_bytes(BranchData::branch_data_size()));
1367 bind(profile_continue);
1368 }
1369 }
1370
1371 // Kills: Z_R1_scratch.
1372 void InterpreterMacroAssembler::profile_call(Register mdp) {
1373 if (ProfileInterpreter) {
1374 Label profile_continue;
1375
1376 // If no method data exists, go to profile_continue.
1377 test_method_data_pointer(mdp, profile_continue);
1378
1379 // We are making a call. Increment the count.
1380 increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset()));
1381
1382 // The method data pointer needs to be updated to reflect the new target.
1383 update_mdp_by_constant(mdp, in_bytes(CounterData::counter_data_size()));
1384 bind(profile_continue);
1385 }
1386 }
1387
1388 void InterpreterMacroAssembler::profile_final_call(Register mdp) {
1389 if (ProfileInterpreter) {
1390 Label profile_continue;
1391
1392 // If no method data exists, go to profile_continue.
1393 test_method_data_pointer(mdp, profile_continue);
1394
1395 // We are making a call. Increment the count.
1396 increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset()));
1397
1398 // The method data pointer needs to be updated to reflect the new target.
1399 update_mdp_by_constant(mdp, in_bytes(VirtualCallData::virtual_call_data_size()));
1400 bind(profile_continue);
1401 }
1402 }
1403
1404 void InterpreterMacroAssembler::profile_virtual_call(Register receiver,
1405 Register mdp,
1406 Register reg2,
1407 bool receiver_can_be_null) {
1408 if (ProfileInterpreter) {
1409 NearLabel profile_continue;
1410
1411 // If no method data exists, go to profile_continue.
1412 test_method_data_pointer(mdp, profile_continue);
1413
1414 NearLabel skip_receiver_profile;
1415 if (receiver_can_be_null) {
1416 NearLabel not_null;
1417 compareU64_and_branch(receiver, (intptr_t)0L, bcondNotEqual, not_null);
1418 // We are making a call. Increment the count for null receiver.
1419 increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset()));
1420 z_bru(skip_receiver_profile);
1421 bind(not_null);
1422 }
1423
1424 // Record the receiver type.
1425 record_klass_in_profile(receiver, mdp, reg2);
1426 bind(skip_receiver_profile);
1427
1428 // The method data pointer needs to be updated to reflect the new target.
1429 update_mdp_by_constant(mdp, in_bytes(VirtualCallData::virtual_call_data_size()));
1430 bind(profile_continue);
1431 }
1432 }
1433
1434 // This routine creates a state machine for updating the multi-row
1435 // type profile at a virtual call site (or other type-sensitive bytecode).
1436 // The machine visits each row (of receiver/count) until the receiver type
1437 // is found, or until it runs out of rows. At the same time, it remembers
1438 // the location of the first empty row. (An empty row records null for its
1439 // receiver, and can be allocated for a newly-observed receiver type.)
1440 // Because there are two degrees of freedom in the state, a simple linear
1441 // search will not work; it must be a decision tree. Hence this helper
1442 // function is recursive, to generate the required tree structured code.
1443 // It's the interpreter, so we are trading off code space for speed.
1444 // See below for example code.
1445 void InterpreterMacroAssembler::record_klass_in_profile_helper(
1446 Register receiver, Register mdp,
1447 Register reg2, int start_row,
1448 Label& done) {
1449 if (TypeProfileWidth == 0) {
1450 increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset()));
1451 return;
1452 }
1453
1454 int last_row = VirtualCallData::row_limit() - 1;
1455 assert(start_row <= last_row, "must be work left to do");
1456 // Test this row for both the receiver and for null.
1457 // Take any of three different outcomes:
1458 // 1. found receiver => increment count and goto done
1459 // 2. found null => keep looking for case 1, maybe allocate this cell
1460 // 3. found something else => keep looking for cases 1 and 2
1461 // Case 3 is handled by a recursive call.
1462 for (int row = start_row; row <= last_row; row++) {
1463 NearLabel next_test;
1464 bool test_for_null_also = (row == start_row);
1465
1466 // See if the receiver is receiver[n].
1467 int recvr_offset = in_bytes(VirtualCallData::receiver_offset(row));
1468 test_mdp_data_at(mdp, recvr_offset, receiver,
1469 (test_for_null_also ? reg2 : noreg),
1470 next_test);
1471 // (Reg2 now contains the receiver from the CallData.)
1472
1473 // The receiver is receiver[n]. Increment count[n].
1474 int count_offset = in_bytes(VirtualCallData::receiver_count_offset(row));
1475 increment_mdp_data_at(mdp, count_offset);
1476 z_bru(done);
1477 bind(next_test);
1478
1479 if (test_for_null_also) {
1480 Label found_null;
1481 // Failed the equality check on receiver[n]... Test for null.
1482 z_ltgr(reg2, reg2);
1483 if (start_row == last_row) {
1484 // The only thing left to do is handle the null case.
1485 z_brz(found_null);
1486 // Receiver did not match any saved receiver and there is no empty row for it.
1487 // Increment total counter to indicate polymorphic case.
1488 increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset()));
1489 z_bru(done);
1490 bind(found_null);
1491 break;
1492 }
1493 // Since null is rare, make it be the branch-taken case.
1494 z_brz(found_null);
1495
1496 // Put all the "Case 3" tests here.
1497 record_klass_in_profile_helper(receiver, mdp, reg2, start_row + 1, done);
1498
1499 // Found a null. Keep searching for a matching receiver,
1500 // but remember that this is an empty (unused) slot.
1501 bind(found_null);
1502 }
1503 }
1504
1505 // In the fall-through case, we found no matching receiver, but we
1506 // observed the receiver[start_row] is null.
1507
1508 // Fill in the receiver field and increment the count.
1509 int recvr_offset = in_bytes(VirtualCallData::receiver_offset(start_row));
1510 set_mdp_data_at(mdp, recvr_offset, receiver);
1511 int count_offset = in_bytes(VirtualCallData::receiver_count_offset(start_row));
1512 load_const_optimized(reg2, DataLayout::counter_increment);
1513 set_mdp_data_at(mdp, count_offset, reg2);
1514 if (start_row > 0) {
1515 z_bru(done);
1516 }
1517 }
1518
1519 // Example state machine code for three profile rows:
1520 // // main copy of decision tree, rooted at row[1]
1521 // if (row[0].rec == rec) { row[0].incr(); goto done; }
1522 // if (row[0].rec != nullptr) {
1523 // // inner copy of decision tree, rooted at row[1]
1524 // if (row[1].rec == rec) { row[1].incr(); goto done; }
1525 // if (row[1].rec != nullptr) {
1526 // // degenerate decision tree, rooted at row[2]
1527 // if (row[2].rec == rec) { row[2].incr(); goto done; }
1528 // if (row[2].rec != nullptr) { count.incr(); goto done; } // overflow
1529 // row[2].init(rec); goto done;
1530 // } else {
1531 // // remember row[1] is empty
1532 // if (row[2].rec == rec) { row[2].incr(); goto done; }
1533 // row[1].init(rec); goto done;
1534 // }
1535 // } else {
1536 // // remember row[0] is empty
1537 // if (row[1].rec == rec) { row[1].incr(); goto done; }
1538 // if (row[2].rec == rec) { row[2].incr(); goto done; }
1539 // row[0].init(rec); goto done;
1540 // }
1541 // done:
1542
1543 void InterpreterMacroAssembler::record_klass_in_profile(Register receiver,
1544 Register mdp, Register reg2) {
1545 assert(ProfileInterpreter, "must be profiling");
1546 Label done;
1547
1548 record_klass_in_profile_helper(receiver, mdp, reg2, 0, done);
1549
1550 bind (done);
1551 }
1552
1553 void InterpreterMacroAssembler::profile_ret(Register return_bci, Register mdp) {
1554 if (ProfileInterpreter) {
1555 NearLabel profile_continue;
1556 uint row;
1557
1558 // If no method data exists, go to profile_continue.
1559 test_method_data_pointer(mdp, profile_continue);
1560
1561 // Update the total ret count.
1562 increment_mdp_data_at(mdp, in_bytes(CounterData::count_offset()));
1563
1564 for (row = 0; row < RetData::row_limit(); row++) {
1565 NearLabel next_test;
1566
1567 // See if return_bci is equal to bci[n]:
1568 test_mdp_data_at(mdp,
1569 in_bytes(RetData::bci_offset(row)),
1570 return_bci, noreg,
1571 next_test);
1572
1573 // Return_bci is equal to bci[n]. Increment the count.
1574 increment_mdp_data_at(mdp, in_bytes(RetData::bci_count_offset(row)));
1575
1576 // The method data pointer needs to be updated to reflect the new target.
1577 update_mdp_by_offset(mdp, in_bytes(RetData::bci_displacement_offset(row)));
1578 z_bru(profile_continue);
1579 bind(next_test);
1580 }
1581
1582 update_mdp_for_ret(return_bci);
1583
1584 bind(profile_continue);
1585 }
1586 }
1587
1588 void InterpreterMacroAssembler::profile_null_seen(Register mdp) {
1589 if (ProfileInterpreter) {
1590 Label profile_continue;
1591
1592 // If no method data exists, go to profile_continue.
1593 test_method_data_pointer(mdp, profile_continue);
1594
1595 set_mdp_flag_at(mdp, BitData::null_seen_byte_constant());
1596
1597 // The method data pointer needs to be updated.
1598 int mdp_delta = in_bytes(BitData::bit_data_size());
1599 if (TypeProfileCasts) {
1600 mdp_delta = in_bytes(VirtualCallData::virtual_call_data_size());
1601 }
1602 update_mdp_by_constant(mdp, mdp_delta);
1603
1604 bind(profile_continue);
1605 }
1606 }
1607
1608 void InterpreterMacroAssembler::profile_typecheck(Register mdp, Register klass, Register reg2) {
1609 if (ProfileInterpreter) {
1610 Label profile_continue;
1611
1612 // If no method data exists, go to profile_continue.
1613 test_method_data_pointer(mdp, profile_continue);
1614
1615 // The method data pointer needs to be updated.
1616 int mdp_delta = in_bytes(BitData::bit_data_size());
1617 if (TypeProfileCasts) {
1618 mdp_delta = in_bytes(VirtualCallData::virtual_call_data_size());
1619
1620 // Record the object type.
1621 record_klass_in_profile(klass, mdp, reg2);
1622 }
1623 update_mdp_by_constant(mdp, mdp_delta);
1624
1625 bind(profile_continue);
1626 }
1627 }
1628
1629 void InterpreterMacroAssembler::profile_switch_default(Register mdp) {
1630 if (ProfileInterpreter) {
1631 Label profile_continue;
1632
1633 // If no method data exists, go to profile_continue.
1634 test_method_data_pointer(mdp, profile_continue);
1635
1636 // Update the default case count.
1637 increment_mdp_data_at(mdp, in_bytes(MultiBranchData::default_count_offset()));
1638
1639 // The method data pointer needs to be updated.
1640 update_mdp_by_offset(mdp, in_bytes(MultiBranchData::default_displacement_offset()));
1641
1642 bind(profile_continue);
1643 }
1644 }
1645
1646 // Kills: index, scratch1, scratch2.
1647 void InterpreterMacroAssembler::profile_switch_case(Register index,
1648 Register mdp,
1649 Register scratch1,
1650 Register scratch2) {
1651 if (ProfileInterpreter) {
1652 Label profile_continue;
1653 assert_different_registers(index, mdp, scratch1, scratch2);
1654
1655 // If no method data exists, go to profile_continue.
1656 test_method_data_pointer(mdp, profile_continue);
1657
1658 // Build the base (index * per_case_size_in_bytes()) +
1659 // case_array_offset_in_bytes().
1660 z_sllg(index, index, exact_log2(in_bytes(MultiBranchData::per_case_size())));
1661 add2reg(index, in_bytes(MultiBranchData::case_array_offset()));
1662
1663 // Add the calculated base to the mdp -> address of the case' data.
1664 Address case_data_addr(mdp, index);
1665 Register case_data = scratch1;
1666 load_address(case_data, case_data_addr);
1667
1668 // Update the case count.
1669 increment_mdp_data_at(case_data,
1670 in_bytes(MultiBranchData::relative_count_offset()),
1671 scratch2);
1672
1673 // The method data pointer needs to be updated.
1674 update_mdp_by_offset(mdp,
1675 index,
1676 in_bytes(MultiBranchData::relative_displacement_offset()));
1677
1678 bind(profile_continue);
1679 }
1680 }
1681
1682 // kills: R0, R1, flags, loads klass from obj (if not null)
1683 void InterpreterMacroAssembler::profile_obj_type(Register obj, Address mdo_addr, Register klass, bool cmp_done) {
1684 NearLabel null_seen, init_klass, do_nothing, do_update;
1685
1686 // Klass = obj is allowed.
1687 const Register tmp = Z_R1;
1688 assert_different_registers(obj, mdo_addr.base(), tmp, Z_R0);
1689 assert_different_registers(klass, mdo_addr.base(), tmp, Z_R0);
1690
1691 z_lg(tmp, mdo_addr);
1692 if (cmp_done) {
1693 z_brz(null_seen);
1694 } else {
1695 compareU64_and_branch(obj, (intptr_t)0, Assembler::bcondEqual, null_seen);
1696 }
1697
1698 MacroAssembler::verify_oop(obj, FILE_AND_LINE);
1699 load_klass(klass, obj);
1700
1701 // Klass seen before, nothing to do (regardless of unknown bit).
1702 z_lgr(Z_R0, tmp);
1703 assert(Immediate::is_uimm(~TypeEntries::type_klass_mask, 16), "or change following instruction");
1704 z_nill(Z_R0, TypeEntries::type_klass_mask & 0xFFFF);
1705 compareU64_and_branch(Z_R0, klass, Assembler::bcondEqual, do_nothing);
1706
1707 // Already unknown. Nothing to do anymore.
1708 z_tmll(tmp, TypeEntries::type_unknown);
1709 z_brc(Assembler::bcondAllOne, do_nothing);
1710
1711 z_lgr(Z_R0, tmp);
1712 assert(Immediate::is_uimm(~TypeEntries::type_mask, 16), "or change following instruction");
1713 z_nill(Z_R0, TypeEntries::type_mask & 0xFFFF);
1714 compareU64_and_branch(Z_R0, (intptr_t)0, Assembler::bcondEqual, init_klass);
1715
1716 // Different than before. Cannot keep accurate profile.
1717 z_oill(tmp, TypeEntries::type_unknown);
1718 z_bru(do_update);
1719
1720 bind(init_klass);
1721 // Combine klass and null_seen bit (only used if (tmp & type_mask)==0).
1722 z_ogr(tmp, klass);
1723 z_bru(do_update);
1724
1725 bind(null_seen);
1726 // Set null_seen if obj is 0.
1727 z_oill(tmp, TypeEntries::null_seen);
1728 // fallthru: z_bru(do_update);
1729
1730 bind(do_update);
1731 z_stg(tmp, mdo_addr);
1732
1733 bind(do_nothing);
1734 }
1735
1736 void InterpreterMacroAssembler::profile_arguments_type(Register mdp, Register callee, Register tmp, bool is_virtual) {
1737 if (!ProfileInterpreter) {
1738 return;
1739 }
1740
1741 assert_different_registers(mdp, callee, tmp);
1742
1743 if (MethodData::profile_arguments() || MethodData::profile_return()) {
1744 Label profile_continue;
1745
1746 test_method_data_pointer(mdp, profile_continue);
1747
1748 int off_to_start = is_virtual ? in_bytes(VirtualCallData::virtual_call_data_size()) : in_bytes(CounterData::counter_data_size());
1749
1750 z_cliy(in_bytes(DataLayout::tag_offset()) - off_to_start, mdp,
1751 is_virtual ? DataLayout::virtual_call_type_data_tag : DataLayout::call_type_data_tag);
1752 z_brne(profile_continue);
1753
1754 if (MethodData::profile_arguments()) {
1755 NearLabel done;
1756 int off_to_args = in_bytes(TypeEntriesAtCall::args_data_offset());
1757 add2reg(mdp, off_to_args);
1758
1759 for (int i = 0; i < TypeProfileArgsLimit; i++) {
1760 if (i > 0 || MethodData::profile_return()) {
1761 // If return value type is profiled we may have no argument to profile.
1762 z_lg(tmp, in_bytes(TypeEntriesAtCall::cell_count_offset())-off_to_args, mdp);
1763 add2reg(tmp, -i*TypeStackSlotEntries::per_arg_count());
1764 compare64_and_branch(tmp, TypeStackSlotEntries::per_arg_count(), Assembler::bcondLow, done);
1765 }
1766 z_lg(tmp, Address(callee, Method::const_offset()));
1767 z_lgh(tmp, Address(tmp, ConstMethod::size_of_parameters_offset()));
1768 // Stack offset o (zero based) from the start of the argument
1769 // list. For n arguments translates into offset n - o - 1 from
1770 // the end of the argument list. But there is an extra slot at
1771 // the top of the stack. So the offset is n - o from Lesp.
1772 z_sg(tmp, Address(mdp, in_bytes(TypeEntriesAtCall::stack_slot_offset(i))-off_to_args));
1773 z_sllg(tmp, tmp, Interpreter::logStackElementSize);
1774 Address stack_slot_addr(tmp, Z_esp);
1775 z_ltg(tmp, stack_slot_addr);
1776
1777 Address mdo_arg_addr(mdp, in_bytes(TypeEntriesAtCall::argument_type_offset(i))-off_to_args);
1778 profile_obj_type(tmp, mdo_arg_addr, tmp, /*ltg did compare to 0*/ true);
1779
1780 int to_add = in_bytes(TypeStackSlotEntries::per_arg_size());
1781 add2reg(mdp, to_add);
1782 off_to_args += to_add;
1783 }
1784
1785 if (MethodData::profile_return()) {
1786 z_lg(tmp, in_bytes(TypeEntriesAtCall::cell_count_offset())-off_to_args, mdp);
1787 add2reg(tmp, -TypeProfileArgsLimit*TypeStackSlotEntries::per_arg_count());
1788 }
1789
1790 bind(done);
1791
1792 if (MethodData::profile_return()) {
1793 // We're right after the type profile for the last
1794 // argument. Tmp is the number of cells left in the
1795 // CallTypeData/VirtualCallTypeData to reach its end. Non null
1796 // if there's a return to profile.
1797 assert(ReturnTypeEntry::static_cell_count() < TypeStackSlotEntries::per_arg_count(), "can't move past ret type");
1798 z_sllg(tmp, tmp, exact_log2(DataLayout::cell_size));
1799 z_agr(mdp, tmp);
1800 }
1801 z_stg(mdp, _z_ijava_state_neg(mdx), Z_fp);
1802 } else {
1803 assert(MethodData::profile_return(), "either profile call args or call ret");
1804 update_mdp_by_constant(mdp, in_bytes(TypeEntriesAtCall::return_only_size()));
1805 }
1806
1807 // Mdp points right after the end of the
1808 // CallTypeData/VirtualCallTypeData, right after the cells for the
1809 // return value type if there's one.
1810 bind(profile_continue);
1811 }
1812 }
1813
1814 void InterpreterMacroAssembler::profile_return_type(Register mdp, Register ret, Register tmp) {
1815 assert_different_registers(mdp, ret, tmp);
1816 if (ProfileInterpreter && MethodData::profile_return()) {
1817 Label profile_continue;
1818
1819 test_method_data_pointer(mdp, profile_continue);
1820
1821 if (MethodData::profile_return_jsr292_only()) {
1822 // If we don't profile all invoke bytecodes we must make sure
1823 // it's a bytecode we indeed profile. We can't go back to the
1824 // beginning of the ProfileData we intend to update to check its
1825 // type because we're right after it and we don't known its
1826 // length.
1827 NearLabel do_profile;
1828 Address bc(Z_bcp);
1829 z_lb(tmp, bc);
1830 compare32_and_branch(tmp, Bytecodes::_invokedynamic, Assembler::bcondEqual, do_profile);
1831 compare32_and_branch(tmp, Bytecodes::_invokehandle, Assembler::bcondEqual, do_profile);
1832 get_method(tmp);
1833 // Supplement to 8139891: _intrinsic_id exceeded 1-byte size limit.
1834 if (Method::intrinsic_id_size_in_bytes() == 1) {
1835 z_cli(in_bytes(Method::intrinsic_id_offset()), tmp, static_cast<int>(vmIntrinsics::_compiledLambdaForm));
1836 } else {
1837 assert(Method::intrinsic_id_size_in_bytes() == 2, "size error: check Method::_intrinsic_id");
1838 z_lh(tmp, in_bytes(Method::intrinsic_id_offset()), Z_R0, tmp);
1839 z_chi(tmp, static_cast<int>(vmIntrinsics::_compiledLambdaForm));
1840 }
1841 z_brne(profile_continue);
1842
1843 bind(do_profile);
1844 }
1845
1846 Address mdo_ret_addr(mdp, -in_bytes(ReturnTypeEntry::size()));
1847 profile_obj_type(ret, mdo_ret_addr, tmp);
1848
1849 bind(profile_continue);
1850 }
1851 }
1852
1853 void InterpreterMacroAssembler::profile_parameters_type(Register mdp, Register tmp1, Register tmp2) {
1854 if (ProfileInterpreter && MethodData::profile_parameters()) {
1855 Label profile_continue, done;
1856
1857 test_method_data_pointer(mdp, profile_continue);
1858
1859 // Load the offset of the area within the MDO used for
1860 // parameters. If it's negative we're not profiling any parameters.
1861 Address parm_di_addr(mdp, in_bytes(MethodData::parameters_type_data_di_offset()) - in_bytes(MethodData::data_offset()));
1862 load_and_test_int2long(tmp1, parm_di_addr);
1863 z_brl(profile_continue);
1864
1865 // Compute a pointer to the area for parameters from the offset
1866 // and move the pointer to the slot for the last
1867 // parameters. Collect profiling from last parameter down.
1868 // mdo start + parameters offset + array length - 1
1869
1870 // Pointer to the parameter area in the MDO.
1871 z_agr(mdp, tmp1);
1872
1873 // Offset of the current profile entry to update.
1874 const Register entry_offset = tmp1;
1875 // entry_offset = array len in number of cells.
1876 z_lg(entry_offset, Address(mdp, ArrayData::array_len_offset()));
1877 // entry_offset (number of cells) = array len - size of 1 entry
1878 add2reg(entry_offset, -TypeStackSlotEntries::per_arg_count());
1879 // entry_offset in bytes
1880 z_sllg(entry_offset, entry_offset, exact_log2(DataLayout::cell_size));
1881
1882 Label loop;
1883 bind(loop);
1884
1885 Address arg_off(mdp, entry_offset, ParametersTypeData::stack_slot_offset(0));
1886 Address arg_type(mdp, entry_offset, ParametersTypeData::type_offset(0));
1887
1888 // Load offset on the stack from the slot for this parameter.
1889 z_lg(tmp2, arg_off);
1890 z_sllg(tmp2, tmp2, Interpreter::logStackElementSize);
1891 z_lcgr(tmp2); // Negate.
1892
1893 // Profile the parameter.
1894 z_ltg(tmp2, Address(Z_locals, tmp2));
1895 profile_obj_type(tmp2, arg_type, tmp2, /*ltg did compare to 0*/ true);
1896
1897 // Go to next parameter.
1898 z_aghi(entry_offset, -TypeStackSlotEntries::per_arg_count() * DataLayout::cell_size);
1899 z_brnl(loop);
1900
1901 bind(profile_continue);
1902 }
1903 }
1904
1905 // Jump if ((*counter_addr += increment) & mask) satisfies the condition.
1906 void InterpreterMacroAssembler::increment_mask_and_jump(Address counter_addr,
1907 int increment,
1908 Address mask,
1909 Register scratch,
1910 bool preloaded,
1911 branch_condition cond,
1912 Label *where) {
1913 assert_different_registers(counter_addr.base(), scratch);
1914 if (preloaded) {
1915 add2reg(scratch, increment);
1916 reg2mem_opt(scratch, counter_addr, false);
1917 } else {
1918 if (VM_Version::has_MemWithImmALUOps() && Immediate::is_simm8(increment) && counter_addr.is_RSYform()) {
1919 z_alsi(counter_addr.disp20(), counter_addr.base(), increment);
1920 mem2reg_signed_opt(scratch, counter_addr);
1921 } else {
1922 mem2reg_signed_opt(scratch, counter_addr);
1923 add2reg(scratch, increment);
1924 reg2mem_opt(scratch, counter_addr, false);
1925 }
1926 }
1927 z_n(scratch, mask);
1928 if (where) { z_brc(cond, *where); }
1929 }
1930
1931 // Get MethodCounters object for given method. Lazily allocated if necessary.
1932 // method - Ptr to Method object.
1933 // Rcounters - Ptr to MethodCounters object associated with Method object.
1934 // skip - Exit point if MethodCounters object can't be created (OOM condition).
1935 void InterpreterMacroAssembler::get_method_counters(Register Rmethod,
1936 Register Rcounters,
1937 Label& skip) {
1938 assert_different_registers(Rmethod, Rcounters);
1939
1940 BLOCK_COMMENT("get MethodCounters object {");
1941
1942 Label has_counters;
1943 load_and_test_long(Rcounters, Address(Rmethod, Method::method_counters_offset()));
1944 z_brnz(has_counters);
1945
1946 call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::build_method_counters), Rmethod);
1947 z_ltgr(Rcounters, Z_RET); // Runtime call returns MethodCounters object.
1948 z_brz(skip); // No MethodCounters, out of memory.
1949
1950 bind(has_counters);
1951
1952 BLOCK_COMMENT("} get MethodCounters object");
1953 }
1954
1955 // Increment invocation counter in MethodCounters object.
1956 // Return (invocation_counter+backedge_counter) as "result" in RctrSum.
1957 // Counter values are all unsigned.
1958 void InterpreterMacroAssembler::increment_invocation_counter(Register Rcounters, Register RctrSum) {
1959 assert(UseCompiler, "incrementing must be useful");
1960 assert_different_registers(Rcounters, RctrSum);
1961
1962 int increment = InvocationCounter::count_increment;
1963 int inv_counter_offset = in_bytes(MethodCounters::invocation_counter_offset() + InvocationCounter::counter_offset());
1964 int be_counter_offset = in_bytes(MethodCounters::backedge_counter_offset() + InvocationCounter::counter_offset());
1965
1966 BLOCK_COMMENT("Increment invocation counter {");
1967
1968 if (VM_Version::has_MemWithImmALUOps() && Immediate::is_simm8(increment)) {
1969 // Increment the invocation counter in place,
1970 // then add the incremented value to the backedge counter.
1971 z_l(RctrSum, be_counter_offset, Rcounters);
1972 z_alsi(inv_counter_offset, Rcounters, increment); // Atomic increment @no extra cost!
1973 z_nilf(RctrSum, InvocationCounter::count_mask_value); // Mask off state bits.
1974 z_al(RctrSum, inv_counter_offset, Z_R0, Rcounters);
1975 } else {
1976 // This path is optimized for low register consumption
1977 // at the cost of somewhat higher operand delays.
1978 // It does not need an extra temp register.
1979
1980 // Update the invocation counter.
1981 z_l(RctrSum, inv_counter_offset, Rcounters);
1982 if (RctrSum == Z_R0) {
1983 z_ahi(RctrSum, increment);
1984 } else {
1985 add2reg(RctrSum, increment);
1986 }
1987 z_st(RctrSum, inv_counter_offset, Rcounters);
1988
1989 // Mask off the state bits.
1990 z_nilf(RctrSum, InvocationCounter::count_mask_value);
1991
1992 // Add the backedge counter to the updated invocation counter to
1993 // form the result.
1994 z_al(RctrSum, be_counter_offset, Z_R0, Rcounters);
1995 }
1996
1997 BLOCK_COMMENT("} Increment invocation counter");
1998
1999 // Note that this macro must leave the backedge_count + invocation_count in Rtmp!
2000 }
2001
2002
2003 // increment backedge counter in MethodCounters object.
2004 // return (invocation_counter+backedge_counter) as "result" in RctrSum
2005 // counter values are all unsigned!
2006 void InterpreterMacroAssembler::increment_backedge_counter(Register Rcounters, Register RctrSum) {
2007 assert(UseCompiler, "incrementing must be useful");
2008 assert_different_registers(Rcounters, RctrSum);
2009
2010 int increment = InvocationCounter::count_increment;
2011 int inv_counter_offset = in_bytes(MethodCounters::invocation_counter_offset() + InvocationCounter::counter_offset());
2012 int be_counter_offset = in_bytes(MethodCounters::backedge_counter_offset() + InvocationCounter::counter_offset());
2013
2014 BLOCK_COMMENT("Increment backedge counter {");
2015
2016 if (VM_Version::has_MemWithImmALUOps() && Immediate::is_simm8(increment)) {
2017 // Increment the invocation counter in place,
2018 // then add the incremented value to the backedge counter.
2019 z_l(RctrSum, inv_counter_offset, Rcounters);
2020 z_alsi(be_counter_offset, Rcounters, increment); // Atomic increment @no extra cost!
2021 z_nilf(RctrSum, InvocationCounter::count_mask_value); // Mask off state bits.
2022 z_al(RctrSum, be_counter_offset, Z_R0, Rcounters);
2023 } else {
2024 // This path is optimized for low register consumption
2025 // at the cost of somewhat higher operand delays.
2026 // It does not need an extra temp register.
2027
2028 // Update the invocation counter.
2029 z_l(RctrSum, be_counter_offset, Rcounters);
2030 if (RctrSum == Z_R0) {
2031 z_ahi(RctrSum, increment);
2032 } else {
2033 add2reg(RctrSum, increment);
2034 }
2035 z_st(RctrSum, be_counter_offset, Rcounters);
2036
2037 // Mask off the state bits.
2038 z_nilf(RctrSum, InvocationCounter::count_mask_value);
2039
2040 // Add the backedge counter to the updated invocation counter to
2041 // form the result.
2042 z_al(RctrSum, inv_counter_offset, Z_R0, Rcounters);
2043 }
2044
2045 BLOCK_COMMENT("} Increment backedge counter");
2046
2047 // Note that this macro must leave the backedge_count + invocation_count in Rtmp!
2048 }
2049
2050 // Add an InterpMonitorElem to stack (see frame_s390.hpp).
2051 void InterpreterMacroAssembler::add_monitor_to_stack(bool stack_is_empty,
2052 Register Rtemp1,
2053 Register Rtemp2,
2054 Register Rtemp3) {
2055
2056 const Register Rcurr_slot = Rtemp1;
2057 const Register Rlimit = Rtemp2;
2058 const jint delta = -frame::interpreter_frame_monitor_size_in_bytes();
2059
2060 assert((delta & LongAlignmentMask) == 0,
2061 "sizeof BasicObjectLock must be even number of doublewords");
2062 assert(2 * wordSize == -delta, "this works only as long as delta == -2*wordSize");
2063 assert(Rcurr_slot != Z_R0, "Register must be usable as base register");
2064 assert_different_registers(Rlimit, Rcurr_slot, Rtemp3);
2065
2066 get_monitors(Rlimit);
2067
2068 // Adjust stack pointer for additional monitor entry.
2069 resize_frame(RegisterOrConstant((intptr_t) delta), Z_fp, false);
2070
2071 if (!stack_is_empty) {
2072 // Must copy stack contents down.
2073 NearLabel next, done;
2074
2075 // Rtemp := addr(Tos), Z_esp is pointing below it!
2076 add2reg(Rcurr_slot, wordSize, Z_esp);
2077
2078 // Nothing to do, if already at monitor area.
2079 compareU64_and_branch(Rcurr_slot, Rlimit, bcondNotLow, done);
2080
2081 bind(next);
2082
2083 // Move one stack slot.
2084 mem2reg_opt(Rtemp3, Address(Rcurr_slot));
2085 reg2mem_opt(Rtemp3, Address(Rcurr_slot, delta));
2086 add2reg(Rcurr_slot, wordSize);
2087 compareU64_and_branch(Rcurr_slot, Rlimit, bcondLow, next); // Are we done?
2088
2089 bind(done);
2090 // Done copying stack.
2091 }
2092
2093 // Adjust expression stack and monitor pointers.
2094 add2reg(Z_esp, delta);
2095 add2reg(Rlimit, delta);
2096 save_monitors(Rlimit);
2097 }
2098
2099 // Note: Index holds the offset in bytes afterwards.
2100 // You can use this to store a new value (with Llocals as the base).
2101 void InterpreterMacroAssembler::access_local_int(Register index, Register dst) {
2102 z_sllg(index, index, LogBytesPerWord);
2103 mem2reg_opt(dst, Address(Z_locals, index), false);
2104 }
2105
2106 void InterpreterMacroAssembler::verify_oop(Register reg, TosState state) {
2107 if (state == atos) { MacroAssembler::verify_oop(reg, FILE_AND_LINE); }
2108 }
2109
2110 // Inline assembly for:
2111 //
2112 // if (thread is in interp_only_mode) {
2113 // InterpreterRuntime::post_method_entry();
2114 // }
2115
2116 void InterpreterMacroAssembler::notify_method_entry() {
2117
2118 // JVMTI
2119 // Whenever JVMTI puts a thread in interp_only_mode, method
2120 // entry/exit events are sent for that thread to track stack
2121 // depth. If it is possible to enter interp_only_mode we add
2122 // the code to check if the event should be sent.
2123 if (JvmtiExport::can_post_interpreter_events()) {
2124 Label jvmti_post_done;
2125 MacroAssembler::load_and_test_int(Z_R0, Address(Z_thread, JavaThread::interp_only_mode_offset()));
2126 z_bre(jvmti_post_done);
2127 call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::post_method_entry));
2128 bind(jvmti_post_done);
2129 }
2130 }
2131
2132 // Inline assembly for:
2133 //
2134 // if (thread is in interp_only_mode) {
2135 // if (!native_method) save result
2136 // InterpreterRuntime::post_method_exit();
2137 // if (!native_method) restore result
2138 // }
2139 // if (DTraceMethodProbes) {
2140 // SharedRuntime::dtrace_method_exit(thread, method);
2141 // }
2142 //
2143 // For native methods their result is stored in z_ijava_state.lresult
2144 // and z_ijava_state.fresult before coming here.
2145 // Java methods have their result stored in the expression stack.
2146 //
2147 // Notice the dependency to frame::interpreter_frame_result().
2148 void InterpreterMacroAssembler::notify_method_exit(bool native_method,
2149 TosState state,
2150 NotifyMethodExitMode mode) {
2151 // JVMTI
2152 // Whenever JVMTI puts a thread in interp_only_mode, method
2153 // entry/exit events are sent for that thread to track stack
2154 // depth. If it is possible to enter interp_only_mode we add
2155 // the code to check if the event should be sent.
2156 if (mode == NotifyJVMTI && JvmtiExport::can_post_interpreter_events()) {
2157 Label jvmti_post_done;
2158 MacroAssembler::load_and_test_int(Z_R0, Address(Z_thread, JavaThread::interp_only_mode_offset()));
2159 z_bre(jvmti_post_done);
2160 if (!native_method) push(state); // see frame::interpreter_frame_result()
2161 call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::post_method_exit));
2162 if (!native_method) pop(state);
2163 bind(jvmti_post_done);
2164 }
2165
2166 #if 0
2167 // Dtrace currently not supported on z/Architecture.
2168 {
2169 SkipIfEqual skip(this, &DTraceMethodProbes, false);
2170 push(state);
2171 get_method(c_rarg1);
2172 call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit),
2173 r15_thread, c_rarg1);
2174 pop(state);
2175 }
2176 #endif
2177 }
2178
2179 void InterpreterMacroAssembler::skip_if_jvmti_mode(Label &Lskip, Register Rscratch) {
2180 if (!JvmtiExport::can_post_interpreter_events()) {
2181 return;
2182 }
2183
2184 load_and_test_int(Rscratch, Address(Z_thread, JavaThread::interp_only_mode_offset()));
2185 z_brnz(Lskip);
2186
2187 }
2188
2189 // Pop the topmost TOP_IJAVA_FRAME and set it's sender_sp as new Z_SP.
2190 // The return pc is loaded into the register return_pc.
2191 //
2192 // Registers updated:
2193 // return_pc - The return pc of the calling frame.
2194 // tmp1, tmp2 - scratch
2195 void InterpreterMacroAssembler::pop_interpreter_frame(Register return_pc, Register tmp1, Register tmp2) {
2196 // F0 Z_SP -> caller_sp (F1's)
2197 // ...
2198 // sender_sp (F1's)
2199 // ...
2200 // F1 Z_fp -> caller_sp (F2's)
2201 // return_pc (Continuation after return from F0.)
2202 // ...
2203 // F2 caller_sp
2204
2205 // Remove F0's activation. Restoring Z_SP to sender_sp reverts modifications
2206 // (a) by a c2i adapter and (b) by generate_fixed_frame().
2207 // In case (a) the new top frame F1 is an unextended compiled frame.
2208 // In case (b) F1 is converted from PARENT_IJAVA_FRAME to TOP_IJAVA_FRAME.
2209
2210 // Case (b) seems to be redundant when returning to a interpreted caller,
2211 // because then the caller's top_frame_sp is installed as sp (see
2212 // TemplateInterpreterGenerator::generate_return_entry_for ()). But
2213 // pop_interpreter_frame() is also used in exception handling and there the
2214 // frame type of the caller is unknown, therefore top_frame_sp cannot be used,
2215 // so it is important that sender_sp is the caller's sp as TOP_IJAVA_FRAME.
2216
2217 Register R_f1_sender_sp = tmp1;
2218 Register R_f2_sp = tmp2;
2219
2220 // First check for the interpreter frame's magic.
2221 asm_assert_ijava_state_magic(R_f2_sp/*tmp*/);
2222 z_lg(R_f2_sp, _z_parent_ijava_frame_abi(callers_sp), Z_fp);
2223 z_lg(R_f1_sender_sp, _z_ijava_state_neg(sender_sp), Z_fp);
2224 if (return_pc->is_valid())
2225 z_lg(return_pc, _z_parent_ijava_frame_abi(return_pc), Z_fp);
2226 // Pop F0 by resizing to R_f1_sender_sp and using R_f2_sp as fp.
2227 resize_frame_absolute(R_f1_sender_sp, R_f2_sp, false/*load fp*/);
2228
2229 #ifdef ASSERT
2230 // The return_pc in the new top frame is dead... at least that's my
2231 // current understanding; to assert this I overwrite it.
2232 load_const_optimized(Z_ARG3, 0xb00b1);
2233 z_stg(Z_ARG3, _z_parent_ijava_frame_abi(return_pc), Z_SP);
2234 #endif
2235 }
2236
2237 void InterpreterMacroAssembler::verify_FPU(int stack_depth, TosState state) {
2238 if (VerifyFPU) {
2239 unimplemented("verifyFPU");
2240 }
2241 }