1 /*
2 * Copyright (c) 2016, 2023, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2016, 2023 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 #include "precompiled.hpp"
27 #include "asm/macroAssembler.inline.hpp"
28 #include "classfile/javaClasses.hpp"
29 #include "compiler/disassembler.hpp"
30 #include "gc/shared/barrierSetAssembler.hpp"
31 #include "interpreter/abstractInterpreter.hpp"
32 #include "interpreter/bytecodeHistogram.hpp"
33 #include "interpreter/interpreter.hpp"
34 #include "interpreter/interpreterRuntime.hpp"
35 #include "interpreter/interp_masm.hpp"
36 #include "interpreter/templateInterpreterGenerator.hpp"
37 #include "interpreter/templateTable.hpp"
38 #include "oops/arrayOop.hpp"
39 #include "oops/methodCounters.hpp"
40 #include "oops/methodData.hpp"
41 #include "oops/oop.inline.hpp"
42 #include "oops/resolvedIndyEntry.hpp"
43 #include "oops/resolvedMethodEntry.hpp"
44 #include "prims/jvmtiExport.hpp"
45 #include "prims/jvmtiThreadState.hpp"
46 #include "runtime/arguments.hpp"
47 #include "runtime/deoptimization.hpp"
48 #include "runtime/frame.inline.hpp"
49 #include "runtime/jniHandles.hpp"
50 #include "runtime/sharedRuntime.hpp"
51 #include "runtime/stubRoutines.hpp"
52 #include "runtime/synchronizer.hpp"
53 #include "runtime/timer.hpp"
54 #include "runtime/vframeArray.hpp"
55 #include "utilities/debug.hpp"
56 #include "utilities/macros.hpp"
57
58 // Size of interpreter code. Increase if too small. Interpreter will
59 // fail with a guarantee ("not enough space for interpreter generation");
60 // if too small.
61 // Run with +PrintInterpreter to get the VM to print out the size.
62 // Max size with JVMTI
63 int TemplateInterpreter::InterpreterCodeSize = 320*K;
64
65 #undef __
66 #ifdef PRODUCT
67 #define __ Disassembler::hook<InterpreterMacroAssembler>(__FILE__, __LINE__, _masm)->
68 #else
69 #define __ Disassembler::hook<InterpreterMacroAssembler>(__FILE__, __LINE__, _masm)->
70 // #define __ (Verbose ? (_masm->block_comment(FILE_AND_LINE),_masm):_masm)->
71 #endif
72
73 #define BLOCK_COMMENT(str) __ block_comment(str)
74 #define BIND(label) __ bind(label); BLOCK_COMMENT(#label ":")
75
76 #define oop_tmp_offset _z_ijava_state_neg(oop_tmp)
77
78 //-----------------------------------------------------------------------------
79
80 address TemplateInterpreterGenerator::generate_slow_signature_handler() {
81 //
82 // New slow_signature handler that respects the z/Architecture
83 // C calling conventions.
84 //
85 // We get called by the native entry code with our output register
86 // area == 8. First we call InterpreterRuntime::get_result_handler
87 // to copy the pointer to the signature string temporarily to the
88 // first C-argument and to return the result_handler in
89 // Z_RET. Since native_entry will copy the jni-pointer to the
90 // first C-argument slot later on, it's OK to occupy this slot
91 // temporarily. Then we copy the argument list on the java
92 // expression stack into native varargs format on the native stack
93 // and load arguments into argument registers. Integer arguments in
94 // the varargs vector will be sign-extended to 8 bytes.
95 //
96 // On entry:
97 // Z_ARG1 - intptr_t* Address of java argument list in memory.
98 // Z_state - zeroInterpreter* Address of interpreter state for
99 // this method
100 // Z_method
101 //
102 // On exit (just before return instruction):
103 // Z_RET contains the address of the result_handler.
104 // Z_ARG2 is not updated for static methods and contains "this" otherwise.
105 // Z_ARG3-Z_ARG5 contain the first 3 arguments of types other than float and double.
106 // Z_FARG1-Z_FARG4 contain the first 4 arguments of type float or double.
107
108 const int LogSizeOfCase = 3;
109
110 const int max_fp_register_arguments = Argument::n_float_register_parameters;
111 const int max_int_register_arguments = Argument::n_register_parameters - 2; // First 2 are reserved.
112
113 const Register arg_java = Z_tmp_2;
114 const Register arg_c = Z_tmp_3;
115 const Register signature = Z_R1_scratch; // Is a string.
116 const Register fpcnt = Z_R0_scratch;
117 const Register argcnt = Z_tmp_4;
118 const Register intSlot = Z_tmp_1;
119 const Register sig_end = Z_tmp_1; // Assumed end of signature (only used in do_object).
120 const Register target_sp = Z_tmp_1;
121 const FloatRegister floatSlot = Z_F1;
122
123 const int d_signature = _z_abi(gpr6); // Only spill space, register contents not affected.
124 const int d_fpcnt = _z_abi(gpr7); // Only spill space, register contents not affected.
125
126 unsigned int entry_offset = __ offset();
127
128 BLOCK_COMMENT("slow_signature_handler {");
129
130 // We use target_sp for storing arguments in the C frame.
131 __ save_return_pc();
132 __ push_frame_abi160(4*BytesPerWord); // Reserve space to save the tmp_[1..4] registers.
133 __ z_stmg(Z_R10, Z_R13, frame::z_abi_160_size, Z_SP); // Save registers only after frame is pushed.
134
135 __ z_lgr(arg_java, Z_ARG1);
136
137 Register method = Z_ARG2; // Directly load into correct argument register.
138
139 __ get_method(method);
140 __ call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::get_signature), Z_thread, method);
141
142 // Move signature to callee saved register.
143 // Don't directly write to stack. Frame is used by VM call.
144 __ z_lgr(Z_tmp_1, Z_RET);
145
146 // Reload method. Register may have been altered by VM call.
147 __ get_method(method);
148
149 // Get address of result handler.
150 __ call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::get_result_handler), Z_thread, method);
151
152 // Save signature address to stack.
153 __ z_stg(Z_tmp_1, d_signature, Z_SP);
154
155 // Don't overwrite return value (Z_RET, Z_ARG1) in rest of the method !
156
157 {
158 Label isStatic;
159
160 // Test if static.
161 // We can test the bit directly.
162 // Path is Z_method->_access_flags._flags.
163 // We only support flag bits in the least significant byte (assert !).
164 // Therefore add 3 to address that byte within "_flags".
165 // Reload method. VM call above may have destroyed register contents
166 __ get_method(method);
167 __ testbit(method2_(method, access_flags), JVM_ACC_STATIC_BIT);
168 method = noreg; // end of life
169 __ z_btrue(isStatic);
170
171 // For non-static functions, pass "this" in Z_ARG2 and copy it to 2nd C-arg slot.
172 // Need to box the Java object here, so we use arg_java
173 // (address of current Java stack slot) as argument and
174 // don't dereference it as in case of ints, floats, etc..
175 __ z_lgr(Z_ARG2, arg_java);
176 __ add2reg(arg_java, -BytesPerWord);
177 __ bind(isStatic);
178 }
179
180 // argcnt == 0 corresponds to 3rd C argument.
181 // arg #1 (result handler) and
182 // arg #2 (this, for non-statics), unused else
183 // are reserved and pre-filled above.
184 // arg_java points to the corresponding Java argument here. It
185 // has been decremented by one argument (this) in case of non-static.
186 __ clear_reg(argcnt, true, false); // Don't set CC.
187 __ z_lg(target_sp, 0, Z_SP);
188 __ add2reg(arg_c, _z_abi(remaining_cargs), target_sp);
189 // No floating-point args parsed so far.
190 __ clear_mem(Address(Z_SP, d_fpcnt), 8);
191
192 NearLabel move_intSlot_to_ARG, move_floatSlot_to_FARG;
193 NearLabel loop_start, loop_start_restore, loop_end;
194 NearLabel do_int, do_long, do_float, do_double;
195 NearLabel do_dontreachhere, do_object, do_array, do_boxed;
196
197 #ifdef ASSERT
198 // Signature needs to point to '(' (== 0x28) at entry.
199 __ z_lg(signature, d_signature, Z_SP);
200 __ z_cli(0, signature, (int) '(');
201 __ z_brne(do_dontreachhere);
202 #endif
203
204 __ bind(loop_start_restore);
205 __ z_lg(signature, d_signature, Z_SP); // Restore signature ptr, destroyed by move_XX_to_ARG.
206
207 BIND(loop_start);
208 // Advance to next argument type token from the signature.
209 __ add2reg(signature, 1);
210
211 // Use CLI, works well on all CPU versions.
212 __ z_cli(0, signature, (int) ')');
213 __ z_bre(loop_end); // end of signature
214 __ z_cli(0, signature, (int) 'L');
215 __ z_bre(do_object); // object #9
216 __ z_cli(0, signature, (int) 'F');
217 __ z_bre(do_float); // float #7
218 __ z_cli(0, signature, (int) 'J');
219 __ z_bre(do_long); // long #6
220 __ z_cli(0, signature, (int) 'B');
221 __ z_bre(do_int); // byte #1
222 __ z_cli(0, signature, (int) 'Z');
223 __ z_bre(do_int); // boolean #2
224 __ z_cli(0, signature, (int) 'C');
225 __ z_bre(do_int); // char #3
226 __ z_cli(0, signature, (int) 'S');
227 __ z_bre(do_int); // short #4
228 __ z_cli(0, signature, (int) 'I');
229 __ z_bre(do_int); // int #5
230 __ z_cli(0, signature, (int) 'D');
231 __ z_bre(do_double); // double #8
232 __ z_cli(0, signature, (int) '[');
233 __ z_bre(do_array); // array #10
234
235 __ bind(do_dontreachhere);
236
237 __ unimplemented("ShouldNotReachHere in slow_signature_handler", 120);
238
239 // Array argument
240 BIND(do_array);
241
242 {
243 Label start_skip, end_skip;
244
245 __ bind(start_skip);
246
247 // Advance to next type tag from signature.
248 __ add2reg(signature, 1);
249
250 // Use CLI, works well on all CPU versions.
251 __ z_cli(0, signature, (int) '[');
252 __ z_bre(start_skip); // Skip further brackets.
253
254 __ z_cli(0, signature, (int) '9');
255 __ z_brh(end_skip); // no optional size
256
257 __ z_cli(0, signature, (int) '0');
258 __ z_brnl(start_skip); // Skip optional size.
259
260 __ bind(end_skip);
261
262 __ z_cli(0, signature, (int) 'L');
263 __ z_brne(do_boxed); // If not array of objects: go directly to do_boxed.
264 }
265
266 // OOP argument
267 BIND(do_object);
268 // Pass by an object's type name.
269 {
270 Label L;
271
272 __ add2reg(sig_end, 4095, signature); // Assume object type name is shorter than 4k.
273 __ load_const_optimized(Z_R0, (int) ';'); // Type name terminator (must be in Z_R0!).
274 __ MacroAssembler::search_string(sig_end, signature);
275 __ z_brl(L);
276 __ z_illtrap(); // No semicolon found: internal error or object name too long.
277 __ bind(L);
278 __ z_lgr(signature, sig_end);
279 // fallthru to do_boxed
280 }
281
282 // Need to box the Java object here, so we use arg_java
283 // (address of current Java stack slot) as argument and
284 // don't dereference it as in case of ints, floats, etc..
285
286 // UNBOX argument
287 // Load reference and check for null.
288 Label do_int_Entry4Boxed;
289 __ bind(do_boxed);
290 {
291 __ load_and_test_long(intSlot, Address(arg_java));
292 __ z_bre(do_int_Entry4Boxed);
293 __ z_lgr(intSlot, arg_java);
294 __ z_bru(do_int_Entry4Boxed);
295 }
296
297 // INT argument
298
299 // (also for byte, boolean, char, short)
300 // Use lgf for load (sign-extend) and stg for store.
301 BIND(do_int);
302 __ z_lgf(intSlot, 0, arg_java);
303
304 __ bind(do_int_Entry4Boxed);
305 __ add2reg(arg_java, -BytesPerWord);
306 // If argument fits into argument register, go and handle it, otherwise continue.
307 __ compare32_and_branch(argcnt, max_int_register_arguments,
308 Assembler::bcondLow, move_intSlot_to_ARG);
309 __ z_stg(intSlot, 0, arg_c);
310 __ add2reg(arg_c, BytesPerWord);
311 __ z_bru(loop_start);
312
313 // LONG argument
314
315 BIND(do_long);
316 __ add2reg(arg_java, -2*BytesPerWord); // Decrement first to have positive displacement for lg.
317 __ z_lg(intSlot, BytesPerWord, arg_java);
318 // If argument fits into argument register, go and handle it, otherwise continue.
319 __ compare32_and_branch(argcnt, max_int_register_arguments,
320 Assembler::bcondLow, move_intSlot_to_ARG);
321 __ z_stg(intSlot, 0, arg_c);
322 __ add2reg(arg_c, BytesPerWord);
323 __ z_bru(loop_start);
324
325 // FLOAT argumen
326
327 BIND(do_float);
328 __ z_le(floatSlot, 0, arg_java);
329 __ add2reg(arg_java, -BytesPerWord);
330 assert(max_fp_register_arguments <= 255, "always true"); // safety net
331 __ z_cli(d_fpcnt+7, Z_SP, max_fp_register_arguments);
332 __ z_brl(move_floatSlot_to_FARG);
333 __ z_ste(floatSlot, 4, arg_c);
334 __ add2reg(arg_c, BytesPerWord);
335 __ z_bru(loop_start);
336
337 // DOUBLE argument
338
339 BIND(do_double);
340 __ add2reg(arg_java, -2*BytesPerWord); // Decrement first to have positive displacement for lg.
341 __ z_ld(floatSlot, BytesPerWord, arg_java);
342 assert(max_fp_register_arguments <= 255, "always true"); // safety net
343 __ z_cli(d_fpcnt+7, Z_SP, max_fp_register_arguments);
344 __ z_brl(move_floatSlot_to_FARG);
345 __ z_std(floatSlot, 0, arg_c);
346 __ add2reg(arg_c, BytesPerWord);
347 __ z_bru(loop_start);
348
349 // Method exit, all arguments processed.
350 __ bind(loop_end);
351 __ z_lmg(Z_R10, Z_R13, frame::z_abi_160_size, Z_SP); // restore registers before frame is popped.
352 __ pop_frame();
353 __ restore_return_pc();
354 __ z_br(Z_R14);
355
356 // Copy int arguments.
357
358 Label iarg_caselist; // Distance between each case has to be a power of 2
359 // (= 1 << LogSizeOfCase).
360 __ align(16);
361 BIND(iarg_caselist);
362 __ z_lgr(Z_ARG3, intSlot); // 4 bytes
363 __ z_bru(loop_start_restore); // 4 bytes
364
365 __ z_lgr(Z_ARG4, intSlot);
366 __ z_bru(loop_start_restore);
367
368 __ z_lgr(Z_ARG5, intSlot);
369 __ z_bru(loop_start_restore);
370
371 __ align(16);
372 __ bind(move_intSlot_to_ARG);
373 __ z_stg(signature, d_signature, Z_SP); // Spill since signature == Z_R1_scratch.
374 __ z_larl(Z_R1_scratch, iarg_caselist);
375 __ z_sllg(Z_R0_scratch, argcnt, LogSizeOfCase);
376 __ add2reg(argcnt, 1);
377 __ z_agr(Z_R1_scratch, Z_R0_scratch);
378 __ z_bcr(Assembler::bcondAlways, Z_R1_scratch);
379
380 // Copy float arguments.
381
382 Label farg_caselist; // Distance between each case has to be a power of 2
383 // (= 1 << logSizeOfCase, padded with nop.
384 __ align(16);
385 BIND(farg_caselist);
386 __ z_ldr(Z_FARG1, floatSlot); // 2 bytes
387 __ z_bru(loop_start_restore); // 4 bytes
388 __ z_nop(); // 2 bytes
389
390 __ z_ldr(Z_FARG2, floatSlot);
391 __ z_bru(loop_start_restore);
392 __ z_nop();
393
394 __ z_ldr(Z_FARG3, floatSlot);
395 __ z_bru(loop_start_restore);
396 __ z_nop();
397
398 __ z_ldr(Z_FARG4, floatSlot);
399 __ z_bru(loop_start_restore);
400 __ z_nop();
401
402 __ align(16);
403 __ bind(move_floatSlot_to_FARG);
404 __ z_stg(signature, d_signature, Z_SP); // Spill since signature == Z_R1_scratch.
405 __ z_lg(Z_R0_scratch, d_fpcnt, Z_SP); // Need old value for indexing.
406 __ add2mem_64(Address(Z_SP, d_fpcnt), 1, Z_R1_scratch); // Increment index.
407 __ z_larl(Z_R1_scratch, farg_caselist);
408 __ z_sllg(Z_R0_scratch, Z_R0_scratch, LogSizeOfCase);
409 __ z_agr(Z_R1_scratch, Z_R0_scratch);
410 __ z_bcr(Assembler::bcondAlways, Z_R1_scratch);
411
412 BLOCK_COMMENT("} slow_signature_handler");
413
414 return __ addr_at(entry_offset);
415 }
416
417 address TemplateInterpreterGenerator::generate_result_handler_for (BasicType type) {
418 address entry = __ pc();
419
420 assert(Z_tos == Z_RET, "Result handler: must move result!");
421 assert(Z_ftos == Z_FRET, "Result handler: must move float result!");
422
423 switch (type) {
424 case T_BOOLEAN:
425 __ c2bool(Z_tos);
426 break;
427 case T_CHAR:
428 __ and_imm(Z_tos, 0xffff);
429 break;
430 case T_BYTE:
431 __ z_lbr(Z_tos, Z_tos);
432 break;
433 case T_SHORT:
434 __ z_lhr(Z_tos, Z_tos);
435 break;
436 case T_INT:
437 case T_LONG:
438 case T_VOID:
439 case T_FLOAT:
440 case T_DOUBLE:
441 break;
442 case T_OBJECT:
443 // Retrieve result from frame...
444 __ mem2reg_opt(Z_tos, Address(Z_fp, oop_tmp_offset));
445 // and verify it.
446 __ verify_oop(Z_tos);
447 break;
448 default:
449 ShouldNotReachHere();
450 }
451 __ z_br(Z_R14); // Return from result handler.
452 return entry;
453 }
454
455 // Abstract method entry.
456 // Attempt to execute abstract method. Throw exception.
457 address TemplateInterpreterGenerator::generate_abstract_entry(void) {
458 unsigned int entry_offset = __ offset();
459
460 // Caller could be the call_stub or a compiled method (x86 version is wrong!).
461
462 BLOCK_COMMENT("abstract_entry {");
463
464 // Implement call of InterpreterRuntime::throw_AbstractMethodError.
465 __ set_top_ijava_frame_at_SP_as_last_Java_frame(Z_SP, Z_R1);
466 __ save_return_pc(); // Save Z_R14.
467 __ push_frame_abi160(0); // Without new frame the RT call could overwrite the saved Z_R14.
468
469 __ call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_AbstractMethodErrorWithMethod),
470 Z_thread, Z_method);
471
472 __ pop_frame();
473 __ restore_return_pc(); // Restore Z_R14.
474 __ reset_last_Java_frame();
475
476 // Restore caller sp for c2i case.
477 __ resize_frame_absolute(Z_R10, Z_R0, true); // Cut the stack back to where the caller started.
478
479 // branch to SharedRuntime::generate_forward_exception() which handles all possible callers,
480 // i.e. call stub, compiled method, interpreted method.
481 __ load_absolute_address(Z_tmp_1, StubRoutines::forward_exception_entry());
482 __ z_br(Z_tmp_1);
483
484 BLOCK_COMMENT("} abstract_entry");
485
486 return __ addr_at(entry_offset);
487 }
488
489 address TemplateInterpreterGenerator::generate_Reference_get_entry(void) {
490 // Inputs:
491 // Z_ARG1 - receiver
492 //
493 // What we do:
494 // - Load the referent field address.
495 // - Load the value in the referent field.
496 // - Pass that value to the pre-barrier.
497 //
498 // In the case of G1 this will record the value of the
499 // referent in an SATB buffer if marking is active.
500 // This will cause concurrent marking to mark the referent
501 // field as live.
502
503 Register scratch1 = Z_tmp_2;
504 Register scratch2 = Z_tmp_3;
505 Register pre_val = Z_RET; // return value
506 // Z_esp is callers operand stack pointer, i.e. it points to the parameters.
507 Register Rargp = Z_esp;
508
509 Label slow_path;
510 address entry = __ pc();
511
512 const int referent_offset = java_lang_ref_Reference::referent_offset();
513
514 BLOCK_COMMENT("Reference_get {");
515
516 // If the receiver is null then it is OK to jump to the slow path.
517 __ load_and_test_long(pre_val, Address(Rargp, Interpreter::stackElementSize)); // Get receiver.
518 __ z_bre(slow_path);
519
520 // Load the value of the referent field.
521 __ load_heap_oop(pre_val, Address(pre_val, referent_offset), scratch1, scratch2, ON_WEAK_OOP_REF);
522
523 // Restore caller sp for c2i case.
524 __ resize_frame_absolute(Z_R10, Z_R0, true); // Cut the stack back to where the caller started.
525 __ z_br(Z_R14);
526
527 // Branch to previously generated regular method entry.
528 __ bind(slow_path);
529
530 address meth_entry = Interpreter::entry_for_kind(Interpreter::zerolocals);
531 __ jump_to_entry(meth_entry, Z_R1);
532
533 BLOCK_COMMENT("} Reference_get");
534
535 return entry;
536 }
537
538 address TemplateInterpreterGenerator::generate_StackOverflowError_handler() {
539 address entry = __ pc();
540
541 DEBUG_ONLY(__ verify_esp(Z_esp, Z_ARG5));
542
543 // Restore bcp under the assumption that the current frame is still
544 // interpreted.
545 __ restore_bcp();
546
547 // Expression stack must be empty before entering the VM if an
548 // exception happened.
549 __ empty_expression_stack();
550 // Throw exception.
551 __ call_VM(noreg,
552 CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_StackOverflowError));
553 return entry;
554 }
555
556 //
557 // Args:
558 // Z_ARG2: oop of array
559 // Z_ARG3: aberrant index
560 //
561 address TemplateInterpreterGenerator::generate_ArrayIndexOutOfBounds_handler() {
562 address entry = __ pc();
563 address excp = CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_ArrayIndexOutOfBoundsException);
564
565 // Expression stack must be empty before entering the VM if an
566 // exception happened.
567 __ empty_expression_stack();
568
569 // Setup parameters.
570 // Pass register with array to create more detailed exceptions.
571 __ call_VM(noreg, excp, Z_ARG2, Z_ARG3);
572 return entry;
573 }
574
575 address TemplateInterpreterGenerator::generate_ClassCastException_handler() {
576 address entry = __ pc();
577
578 // Object is at TOS.
579 __ pop_ptr(Z_ARG2);
580
581 // Expression stack must be empty before entering the VM if an
582 // exception happened.
583 __ empty_expression_stack();
584
585 __ call_VM(Z_ARG1,
586 CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_ClassCastException),
587 Z_ARG2);
588
589 DEBUG_ONLY(__ should_not_reach_here();)
590
591 return entry;
592 }
593
594 address TemplateInterpreterGenerator::generate_exception_handler_common(const char* name, const char* message, bool pass_oop) {
595 assert(!pass_oop || message == nullptr, "either oop or message but not both");
596 address entry = __ pc();
597
598 BLOCK_COMMENT("exception_handler_common {");
599
600 // Expression stack must be empty before entering the VM if an
601 // exception happened.
602 __ empty_expression_stack();
603 if (name != nullptr) {
604 __ load_absolute_address(Z_ARG2, (address)name);
605 } else {
606 __ clear_reg(Z_ARG2, true, false);
607 }
608
609 if (pass_oop) {
610 __ call_VM(Z_tos,
611 CAST_FROM_FN_PTR(address, InterpreterRuntime::create_klass_exception),
612 Z_ARG2, Z_tos /*object (see TT::aastore())*/);
613 } else {
614 if (message != nullptr) {
615 __ load_absolute_address(Z_ARG3, (address)message);
616 } else {
617 __ clear_reg(Z_ARG3, true, false);
618 }
619 __ call_VM(Z_tos,
620 CAST_FROM_FN_PTR(address, InterpreterRuntime::create_exception),
621 Z_ARG2, Z_ARG3);
622 }
623 // Throw exception.
624 __ load_absolute_address(Z_R1_scratch, Interpreter::throw_exception_entry());
625 __ z_br(Z_R1_scratch);
626
627 BLOCK_COMMENT("} exception_handler_common");
628
629 return entry;
630 }
631
632 address TemplateInterpreterGenerator::generate_return_entry_for (TosState state, int step, size_t index_size) {
633 address entry = __ pc();
634
635 BLOCK_COMMENT("return_entry {");
636
637 // Pop i2c extension or revert top-2-parent-resize done by interpreted callees.
638 Register sp_before_i2c_extension = Z_bcp;
639 __ z_lg(Z_fp, _z_abi(callers_sp), Z_SP); // Restore frame pointer.
640 __ z_lg(sp_before_i2c_extension, Address(Z_fp, _z_ijava_state_neg(top_frame_sp)));
641 __ resize_frame_absolute(sp_before_i2c_extension, Z_locals/*tmp*/, true/*load_fp*/);
642
643 // TODO(ZASM): necessary??
644 // // and null it as marker that esp is now tos until next java call
645 // __ movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), (int32_t)NULL_WORD);
646
647 __ restore_bcp();
648 __ restore_locals();
649 __ restore_esp();
650
651 if (state == atos) {
652 __ profile_return_type(Z_tmp_1, Z_tos, Z_tmp_2);
653 }
654
655 Register cache = Z_tmp_1;
656 Register size = Z_tmp_2;
657 Register index = Z_tmp_2;
658 if (index_size == sizeof(u4)) {
659 __ load_resolved_indy_entry(cache, index);
660 __ z_llgh(size, in_bytes(ResolvedIndyEntry::num_parameters_offset()), cache);
661 } else {
662 assert(index_size == sizeof(u2), "Can only be u2");
663 __ load_method_entry(cache, index);
664 __ load_sized_value(size, Address(cache, in_bytes(ResolvedMethodEntry::num_parameters_offset())), sizeof(u2), false /*is_signed*/);
665 }
666 __ z_sllg(size, size, Interpreter::logStackElementSize); // Each argument size in bytes.
667 __ z_agr(Z_esp, size); // Pop arguments.
668
669 __ check_and_handle_popframe(Z_thread);
670 __ check_and_handle_earlyret(Z_thread);
671
672 __ dispatch_next(state, step);
673
674 BLOCK_COMMENT("} return_entry");
675
676 return entry;
677 }
678
679 address TemplateInterpreterGenerator::generate_deopt_entry_for(TosState state,
680 int step,
681 address continuation) {
682 address entry = __ pc();
683
684 BLOCK_COMMENT("deopt_entry {");
685
686 // TODO(ZASM): necessary? null last_sp until next java call
687 // __ movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), (int32_t)NULL_WORD);
688 __ z_lg(Z_fp, _z_abi(callers_sp), Z_SP); // Restore frame pointer.
689 __ restore_bcp();
690 __ restore_locals();
691 __ restore_esp();
692
693 // Handle exceptions.
694 {
695 Label L;
696 __ load_and_test_long(Z_R0/*pending_exception*/, thread_(pending_exception));
697 __ z_bre(L);
698 __ call_VM(noreg,
699 CAST_FROM_FN_PTR(address,
700 InterpreterRuntime::throw_pending_exception));
701 __ should_not_reach_here();
702 __ bind(L);
703 }
704 if (continuation == nullptr) {
705 __ dispatch_next(state, step);
706 } else {
707 __ jump_to_entry(continuation, Z_R1_scratch);
708 }
709
710 BLOCK_COMMENT("} deopt_entry");
711
712 return entry;
713 }
714
715 address TemplateInterpreterGenerator::generate_safept_entry_for (TosState state,
716 address runtime_entry) {
717 address entry = __ pc();
718 __ push(state);
719 __ call_VM(noreg, runtime_entry);
720 __ dispatch_via(vtos, Interpreter::_normal_table.table_for (vtos));
721 return entry;
722 }
723
724 address TemplateInterpreterGenerator::generate_cont_preempt_rerun_interpreter_adapter() {
725 return nullptr;
726 }
727
728
729 //
730 // Helpers for commoning out cases in the various type of method entries.
731 //
732
733 // Increment invocation count & check for overflow.
734 //
735 // Note: checking for negative value instead of overflow
736 // so we have a 'sticky' overflow test.
737 //
738 // Z_ARG2: method (see generate_fixed_frame())
739 //
740 void TemplateInterpreterGenerator::generate_counter_incr(Label* overflow) {
741 Label done;
742 Register method = Z_ARG2; // Generate_fixed_frame() copies Z_method into Z_ARG2.
743 Register m_counters = Z_ARG4;
744
745 BLOCK_COMMENT("counter_incr {");
746
747 // Note: In tiered we increment either counters in method or in MDO depending
748 // if we are profiling or not.
749 int increment = InvocationCounter::count_increment;
750 if (ProfileInterpreter) {
751 NearLabel no_mdo;
752 Register mdo = m_counters;
753 // Are we profiling?
754 __ load_and_test_long(mdo, method2_(method, method_data));
755 __ branch_optimized(Assembler::bcondZero, no_mdo);
756 // Increment counter in the MDO.
757 const Address mdo_invocation_counter(mdo, MethodData::invocation_counter_offset() +
758 InvocationCounter::counter_offset());
759 const Address mask(mdo, MethodData::invoke_mask_offset());
760 __ increment_mask_and_jump(mdo_invocation_counter, increment, mask,
761 Z_R1_scratch, false, Assembler::bcondZero,
762 overflow);
763 __ z_bru(done);
764 __ bind(no_mdo);
765 }
766
767 // Increment counter in MethodCounters.
768 const Address invocation_counter(m_counters,
769 MethodCounters::invocation_counter_offset() +
770 InvocationCounter::counter_offset());
771 // Get address of MethodCounters object.
772 __ get_method_counters(method, m_counters, done);
773 const Address mask(m_counters, MethodCounters::invoke_mask_offset());
774 __ increment_mask_and_jump(invocation_counter,
775 increment, mask,
776 Z_R1_scratch, false, Assembler::bcondZero,
777 overflow);
778
779 __ bind(done);
780
781 BLOCK_COMMENT("} counter_incr");
782 }
783
784 void TemplateInterpreterGenerator::generate_counter_overflow(Label& do_continue) {
785 // InterpreterRuntime::frequency_counter_overflow takes two
786 // arguments, the first (thread) is passed by call_VM, the second
787 // indicates if the counter overflow occurs at a backwards branch
788 // (null bcp). We pass zero for it. The call returns the address
789 // of the verified entry point for the method or null if the
790 // compilation did not complete (either went background or bailed
791 // out).
792 __ clear_reg(Z_ARG2);
793 __ call_VM(noreg,
794 CAST_FROM_FN_PTR(address, InterpreterRuntime::frequency_counter_overflow),
795 Z_ARG2);
796 __ z_bru(do_continue);
797 }
798
799 void TemplateInterpreterGenerator::generate_stack_overflow_check(Register frame_size, Register tmp1) {
800 Register tmp2 = Z_R1_scratch;
801 const int page_size = (int)os::vm_page_size();
802 NearLabel after_frame_check;
803
804 BLOCK_COMMENT("stack_overflow_check {");
805
806 assert_different_registers(frame_size, tmp1);
807
808 // Stack banging is sufficient overflow check if frame_size < page_size.
809 if (Immediate::is_uimm(page_size, 15)) {
810 __ z_chi(frame_size, page_size);
811 __ z_brl(after_frame_check);
812 } else {
813 __ load_const_optimized(tmp1, page_size);
814 __ compareU32_and_branch(frame_size, tmp1, Assembler::bcondLow, after_frame_check);
815 }
816
817 // Get the stack base, and in debug, verify it is non-zero.
818 __ z_lg(tmp1, thread_(stack_base));
819 #ifdef ASSERT
820 address reentry = nullptr;
821 NearLabel base_not_zero;
822 __ compareU64_and_branch(tmp1, (intptr_t)0L, Assembler::bcondNotEqual, base_not_zero);
823 reentry = __ stop_chain_static(reentry, "stack base is zero in generate_stack_overflow_check");
824 __ bind(base_not_zero);
825 #endif
826
827 // Get the stack size, and in debug, verify it is non-zero.
828 assert(sizeof(size_t) == sizeof(intptr_t), "wrong load size");
829 __ z_lg(tmp2, thread_(stack_size));
830 #ifdef ASSERT
831 NearLabel size_not_zero;
832 __ compareU64_and_branch(tmp2, (intptr_t)0L, Assembler::bcondNotEqual, size_not_zero);
833 reentry = __ stop_chain_static(reentry, "stack size is zero in generate_stack_overflow_check");
834 __ bind(size_not_zero);
835 #endif
836
837 // Compute the beginning of the protected zone minus the requested frame size.
838 __ z_sgr(tmp1, tmp2);
839 __ add2reg(tmp1, StackOverflow::stack_guard_zone_size());
840
841 // Add in the size of the frame (which is the same as subtracting it from the
842 // SP, which would take another register.
843 __ z_agr(tmp1, frame_size);
844
845 // The frame is greater than one page in size, so check against
846 // the bottom of the stack.
847 __ compareU64_and_branch(Z_SP, tmp1, Assembler::bcondHigh, after_frame_check);
848
849 // The stack will overflow, throw an exception.
850
851 // Restore SP to sender's sp. This is necessary if the sender's frame is an
852 // extended compiled frame (see gen_c2i_adapter()) and safer anyway in case of
853 // JSR292 adaptations.
854 __ resize_frame_absolute(Z_R10, tmp1, true/*load_fp*/);
855
856 // Note also that the restored frame is not necessarily interpreted.
857 // Use the shared runtime version of the StackOverflowError.
858 assert(StubRoutines::throw_StackOverflowError_entry() != nullptr, "stub not yet generated");
859 AddressLiteral stub(StubRoutines::throw_StackOverflowError_entry());
860 __ load_absolute_address(tmp1, StubRoutines::throw_StackOverflowError_entry());
861 __ z_br(tmp1);
862
863 // If you get to here, then there is enough stack space.
864 __ bind(after_frame_check);
865
866 BLOCK_COMMENT("} stack_overflow_check");
867 }
868
869 // Allocate monitor and lock method (asm interpreter).
870 //
871 // Args:
872 // Z_locals: locals
873
874 void TemplateInterpreterGenerator::lock_method(void) {
875
876 BLOCK_COMMENT("lock_method {");
877
878 // Synchronize method.
879 const Register method = Z_tmp_2;
880 __ get_method(method);
881
882 #ifdef ASSERT
883 address reentry = nullptr;
884 {
885 Label L;
886 __ testbit(method2_(method, access_flags), JVM_ACC_SYNCHRONIZED_BIT);
887 __ z_btrue(L);
888 reentry = __ stop_chain_static(reentry, "method doesn't need synchronization");
889 __ bind(L);
890 }
891 #endif // ASSERT
892
893 // Get synchronization object.
894 const Register object = Z_tmp_2;
895
896 {
897 Label done;
898 Label static_method;
899
900 __ testbit(method2_(method, access_flags), JVM_ACC_STATIC_BIT);
901 __ z_btrue(static_method);
902
903 // non-static method: Load receiver obj from stack.
904 __ mem2reg_opt(object, Address(Z_locals, Interpreter::local_offset_in_bytes(0)));
905 __ z_bru(done);
906
907 __ bind(static_method);
908
909 // Lock the java mirror.
910 // Load mirror from interpreter frame.
911 __ z_lg(object, _z_ijava_state_neg(mirror), Z_fp);
912
913 #ifdef ASSERT
914 {
915 NearLabel L;
916 __ compare64_and_branch(object, (intptr_t) 0, Assembler::bcondNotEqual, L);
917 reentry = __ stop_chain_static(reentry, "synchronization object is null");
918 __ bind(L);
919 }
920 #endif // ASSERT
921
922 __ bind(done);
923 }
924
925 __ add_monitor_to_stack(true, Z_ARG3, Z_ARG4, Z_ARG5); // Allocate monitor elem.
926 // Store object and lock it.
927 __ get_monitors(Z_tmp_1);
928 __ reg2mem_opt(object, Address(Z_tmp_1, BasicObjectLock::obj_offset()));
929 __ lock_object(Z_tmp_1, object);
930
931 BLOCK_COMMENT("} lock_method");
932 }
933
934 // Generate a fixed interpreter frame. This is identical setup for
935 // interpreted methods and for native methods hence the shared code.
936 //
937 // Registers alive
938 // Z_thread - JavaThread*
939 // Z_SP - old stack pointer
940 // Z_method - callee's method
941 // Z_esp - parameter list (slot 'above' last param)
942 // Z_R14 - return pc, to be stored in caller's frame
943 // Z_R10 - sender sp, note: Z_tmp_1 is Z_R10!
944 //
945 // Registers updated
946 // Z_SP - new stack pointer
947 // Z_esp - callee's operand stack pointer
948 // points to the slot above the value on top
949 // Z_locals - used to access locals: locals[i] := *(Z_locals - i*BytesPerWord)
950 // Z_bcp - the bytecode pointer
951 // Z_fp - the frame pointer, thereby killing Z_method
952 // Z_ARG2 - copy of Z_method
953 //
954 void TemplateInterpreterGenerator::generate_fixed_frame(bool native_call) {
955
956 // stack layout
957 //
958 // F1 [TOP_IJAVA_FRAME_ABI] <-- Z_SP, Z_R10 (see note below)
959 // [F1's operand stack (unused)]
960 // [F1's outgoing Java arguments] <-- Z_esp
961 // [F1's operand stack (non args)]
962 // [monitors] (optional)
963 // [IJAVA_STATE]
964 //
965 // F2 [PARENT_IJAVA_FRAME_ABI]
966 // ...
967 //
968 // 0x000
969 //
970 // Note: Z_R10, the sender sp, will be below Z_SP if F1 was extended by a c2i adapter.
971
972 //=============================================================================
973 // Allocate space for locals other than the parameters, the
974 // interpreter state, monitors, and the expression stack.
975
976 const Register local_count = Z_ARG5;
977 const Register fp = Z_tmp_2;
978 const Register const_method = Z_ARG1;
979
980 BLOCK_COMMENT("generate_fixed_frame {");
981 {
982 // local registers
983 const Register top_frame_size = Z_ARG2;
984 const Register sp_after_resize = Z_ARG3;
985 const Register max_stack = Z_ARG4;
986
987 __ z_lg(const_method, Address(Z_method, Method::const_offset()));
988 __ z_llgh(max_stack, Address(const_method, ConstMethod::size_of_parameters_offset()));
989 __ z_sllg(Z_locals /*parameter_count bytes*/, max_stack /*parameter_count*/, LogBytesPerWord);
990
991 if (native_call) {
992 // If we're calling a native method, we replace max_stack (which is
993 // zero) with space for the worst-case signature handler varargs
994 // vector, which is:
995 // max_stack = max(Argument::n_register_parameters, parameter_count+2);
996 //
997 // We add two slots to the parameter_count, one for the jni
998 // environment and one for a possible native mirror. We allocate
999 // space for at least the number of ABI registers, even though
1000 // InterpreterRuntime::slow_signature_handler won't write more than
1001 // parameter_count+2 words when it creates the varargs vector at the
1002 // top of the stack. The generated slow signature handler will just
1003 // load trash into registers beyond the necessary number. We're
1004 // still going to cut the stack back by the ABI register parameter
1005 // count so as to get SP+16 pointing at the ABI outgoing parameter
1006 // area, so we need to allocate at least that much even though we're
1007 // going to throw it away.
1008 //
1009 __ add2reg(max_stack, 2);
1010
1011 NearLabel passing_args_on_stack;
1012
1013 // max_stack in bytes
1014 __ z_sllg(max_stack, max_stack, LogBytesPerWord);
1015
1016 int argument_registers_in_bytes = Argument::n_register_parameters << LogBytesPerWord;
1017 __ compare64_and_branch(max_stack, argument_registers_in_bytes, Assembler::bcondNotLow, passing_args_on_stack);
1018
1019 __ load_const_optimized(max_stack, argument_registers_in_bytes);
1020
1021 __ bind(passing_args_on_stack);
1022 } else {
1023 // !native_call
1024 // local_count = method->constMethod->max_locals();
1025 __ z_llgh(local_count, Address(const_method, ConstMethod::size_of_locals_offset()));
1026
1027 // Calculate number of non-parameter locals (in slots):
1028 __ z_sgr(local_count, max_stack);
1029
1030 // max_stack = method->max_stack();
1031 __ z_llgh(max_stack, Address(const_method, ConstMethod::max_stack_offset()));
1032 // max_stack in bytes
1033 __ z_sllg(max_stack, max_stack, LogBytesPerWord);
1034 }
1035
1036 // Resize (i.e. normally shrink) the top frame F1 ...
1037 // F1 [TOP_IJAVA_FRAME_ABI] <-- Z_SP, Z_R10
1038 // F1's operand stack (free)
1039 // ...
1040 // F1's operand stack (free) <-- Z_esp
1041 // F1's outgoing Java arg m
1042 // ...
1043 // F1's outgoing Java arg 0
1044 // ...
1045 //
1046 // ... into a parent frame (Z_R10 holds F1's SP before any modification, see also above)
1047 //
1048 // +......................+
1049 // : : <-- Z_R10, saved below as F0's z_ijava_state.sender_sp
1050 // : :
1051 // F1 [PARENT_IJAVA_FRAME_ABI] <-- Z_SP \
1052 // F0's non arg local | = delta
1053 // ... |
1054 // F0's non arg local <-- Z_esp /
1055 // F1's outgoing Java arg m
1056 // ...
1057 // F1's outgoing Java arg 0
1058 // ...
1059 //
1060 // then push the new top frame F0.
1061 //
1062 // F0 [TOP_IJAVA_FRAME_ABI] = frame::z_top_ijava_frame_abi_size \
1063 // [operand stack] = max_stack | = top_frame_size
1064 // [IJAVA_STATE] = frame::z_ijava_state_size /
1065
1066 // sp_after_resize = Z_esp - delta
1067 //
1068 // delta = PARENT_IJAVA_FRAME_ABI + (locals_count - params_count)
1069
1070 __ add2reg(sp_after_resize, (Interpreter::stackElementSize) - (frame::z_parent_ijava_frame_abi_size), Z_esp);
1071 if (!native_call) {
1072 __ z_sllg(Z_R0_scratch, local_count, LogBytesPerWord); // Params have already been subtracted from local_count.
1073 __ z_slgr(sp_after_resize, Z_R0_scratch);
1074 }
1075
1076 // top_frame_size = TOP_IJAVA_FRAME_ABI + max_stack + size of interpreter state
1077 __ add2reg(top_frame_size,
1078 frame::z_top_ijava_frame_abi_size +
1079 frame::z_ijava_state_size,
1080 max_stack);
1081
1082 if (!native_call) {
1083 // Stack overflow check.
1084 // Native calls don't need the stack size check since they have no
1085 // expression stack and the arguments are already on the stack and
1086 // we only add a handful of words to the stack.
1087 Register frame_size = max_stack; // Reuse the register for max_stack.
1088 __ z_lgr(frame_size, Z_SP);
1089 __ z_sgr(frame_size, sp_after_resize);
1090 __ z_agr(frame_size, top_frame_size);
1091 generate_stack_overflow_check(frame_size, fp/*tmp1*/);
1092 }
1093
1094 // asm_assert* is a nop in product builds
1095 NOT_PRODUCT(__ z_cg(Z_R14, _z_common_abi(return_pc), Z_SP));
1096 NOT_PRODUCT(__ asm_assert(Assembler::bcondEqual, "killed Z_R14", 0));
1097 __ resize_frame_absolute(sp_after_resize, fp, true);
1098 __ save_return_pc(Z_R14);
1099
1100 // ... and push the new frame F0.
1101 __ push_frame(top_frame_size, fp, true /*copy_sp*/, false);
1102 }
1103
1104 //=============================================================================
1105 // Initialize the new frame F0: initialize interpreter state.
1106
1107 {
1108 // locals
1109 const Register local_addr = Z_ARG4;
1110
1111 BLOCK_COMMENT("generate_fixed_frame: initialize interpreter state {");
1112
1113 #ifdef ASSERT
1114 // Set the magic number (using local_addr as tmp register).
1115 __ load_const_optimized(local_addr, frame::z_istate_magic_number);
1116 __ z_stg(local_addr, _z_ijava_state_neg(magic), fp);
1117 #endif
1118
1119 // Save sender SP from F1 (i.e. before it was potentially modified by an
1120 // adapter) into F0's interpreter state. We use it as well to revert
1121 // resizing the frame above.
1122 __ z_stg(Z_R10, _z_ijava_state_neg(sender_sp), fp);
1123
1124 // Load cp cache and save it at the end of this block.
1125 __ z_lg(Z_R1_scratch, Address(const_method, ConstMethod::constants_offset()));
1126 __ z_lg(Z_R1_scratch, Address(Z_R1_scratch, ConstantPool::cache_offset()));
1127
1128 // z_ijava_state->method = method;
1129 __ z_stg(Z_method, _z_ijava_state_neg(method), fp);
1130
1131 // Point locals at the first argument. Method's locals are the
1132 // parameters on top of caller's expression stack.
1133 // Tos points past last Java argument.
1134
1135 __ z_agr(Z_locals, Z_esp);
1136 // z_ijava_state->locals - i*BytesPerWord points to i-th Java local (i starts at 0)
1137 // z_ijava_state->locals = Z_esp + parameter_count bytes
1138 __ z_stg(Z_locals, _z_ijava_state_neg(locals), fp);
1139
1140 // z_ijava_state->oop_temp = nullptr;
1141 __ store_const(Address(fp, oop_tmp_offset), 0);
1142
1143 // Initialize z_ijava_state->mdx.
1144 Register Rmdp = Z_bcp;
1145 // native_call: assert that mdo is null
1146 const bool check_for_mdo = !native_call DEBUG_ONLY(|| native_call);
1147 if (ProfileInterpreter && check_for_mdo) {
1148 Label get_continue;
1149
1150 __ load_and_test_long(Rmdp, method_(method_data));
1151 __ z_brz(get_continue);
1152 DEBUG_ONLY(if (native_call) __ stop("native methods don't have a mdo"));
1153 __ add2reg(Rmdp, in_bytes(MethodData::data_offset()));
1154 __ bind(get_continue);
1155 }
1156 __ z_stg(Rmdp, _z_ijava_state_neg(mdx), fp);
1157
1158 // Initialize z_ijava_state->bcp and Z_bcp.
1159 if (native_call) {
1160 __ clear_reg(Z_bcp); // Must initialize. Will get written into frame where GC reads it.
1161 } else {
1162 __ add2reg(Z_bcp, in_bytes(ConstMethod::codes_offset()), const_method);
1163 }
1164 __ z_stg(Z_bcp, _z_ijava_state_neg(bcp), fp);
1165
1166 // no monitors and empty operand stack
1167 // => z_ijava_state->monitors points to the top slot in IJAVA_STATE.
1168 // => Z_ijava_state->esp points one slot above into the operand stack.
1169 // z_ijava_state->monitors = fp - frame::z_ijava_state_size - Interpreter::stackElementSize;
1170 // z_ijava_state->esp = Z_esp = z_ijava_state->monitors;
1171 __ add2reg(Z_esp, -frame::z_ijava_state_size, fp);
1172 __ z_stg(Z_esp, _z_ijava_state_neg(monitors), fp);
1173 __ add2reg(Z_esp, -Interpreter::stackElementSize);
1174 __ z_stg(Z_esp, _z_ijava_state_neg(esp), fp);
1175
1176 // z_ijava_state->cpoolCache = Z_R1_scratch (see load above);
1177 __ z_stg(Z_R1_scratch, _z_ijava_state_neg(cpoolCache), fp);
1178
1179 // Get mirror and store it in the frame as GC root for this Method*.
1180 __ load_mirror_from_const_method(Z_R1_scratch, const_method);
1181 __ z_stg(Z_R1_scratch, _z_ijava_state_neg(mirror), fp);
1182
1183 BLOCK_COMMENT("} generate_fixed_frame: initialize interpreter state");
1184
1185 //=============================================================================
1186 if (!native_call) {
1187 // Local_count is already num_locals_slots - num_param_slots.
1188 // Start of locals: local_addr = Z_locals - locals size + 1 slot
1189 __ z_llgh(Z_R0_scratch, Address(const_method, ConstMethod::size_of_locals_offset()));
1190 __ add2reg(local_addr, BytesPerWord, Z_locals);
1191 __ z_sllg(Z_R0_scratch, Z_R0_scratch, LogBytesPerWord);
1192 __ z_sgr(local_addr, Z_R0_scratch);
1193
1194 __ Clear_Array(local_count, local_addr, Z_ARG2);
1195 }
1196
1197 }
1198 // Finally set the frame pointer, destroying Z_method.
1199 assert(Z_fp == Z_method, "maybe set Z_fp earlier if other register than Z_method");
1200 // Oprofile analysis suggests to keep a copy in a register to be used by
1201 // generate_counter_incr().
1202 __ z_lgr(Z_ARG2, Z_method);
1203 __ z_lgr(Z_fp, fp);
1204
1205 BLOCK_COMMENT("} generate_fixed_frame");
1206 }
1207
1208 // Various method entries
1209
1210 // Math function, frame manager must set up an interpreter state, etc.
1211 address TemplateInterpreterGenerator::generate_math_entry(AbstractInterpreter::MethodKind kind) {
1212
1213 // Decide what to do: Use same platform specific instructions and runtime calls as compilers.
1214 bool use_instruction = false;
1215 address runtime_entry = nullptr;
1216 int num_args = 1;
1217 bool double_precision = true;
1218
1219 // s390 specific:
1220 switch (kind) {
1221 case Interpreter::java_lang_math_sqrt:
1222 case Interpreter::java_lang_math_abs: use_instruction = true; break;
1223 case Interpreter::java_lang_math_fmaF:
1224 case Interpreter::java_lang_math_fmaD: use_instruction = UseFMA; break;
1225 default: break; // Fall back to runtime call.
1226 }
1227
1228 switch (kind) {
1229 case Interpreter::java_lang_math_sin : runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dsin); break;
1230 case Interpreter::java_lang_math_cos : runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dcos); break;
1231 case Interpreter::java_lang_math_tan : runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dtan); break;
1232 case Interpreter::java_lang_math_abs : /* run interpreted */ break;
1233 case Interpreter::java_lang_math_sqrt : /* runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dsqrt); not available */ break;
1234 case Interpreter::java_lang_math_log : runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dlog); break;
1235 case Interpreter::java_lang_math_log10: runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dlog10); break;
1236 case Interpreter::java_lang_math_pow : runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dpow); num_args = 2; break;
1237 case Interpreter::java_lang_math_exp : runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dexp); break;
1238 case Interpreter::java_lang_math_fmaF : /* run interpreted */ num_args = 3; double_precision = false; break;
1239 case Interpreter::java_lang_math_fmaD : /* run interpreted */ num_args = 3; break;
1240 default: ShouldNotReachHere();
1241 }
1242
1243 // Use normal entry if neither instruction nor runtime call is used.
1244 if (!use_instruction && runtime_entry == nullptr) return nullptr;
1245
1246 address entry = __ pc();
1247
1248 if (use_instruction) {
1249 switch (kind) {
1250 case Interpreter::java_lang_math_sqrt:
1251 // Can use memory operand directly.
1252 __ z_sqdb(Z_FRET, Interpreter::stackElementSize, Z_esp);
1253 break;
1254 case Interpreter::java_lang_math_abs:
1255 // Load operand from stack.
1256 __ mem2freg_opt(Z_FRET, Address(Z_esp, Interpreter::stackElementSize));
1257 __ z_lpdbr(Z_FRET);
1258 break;
1259 case Interpreter::java_lang_math_fmaF:
1260 __ mem2freg_opt(Z_FRET, Address(Z_esp, Interpreter::stackElementSize)); // result reg = arg3
1261 __ mem2freg_opt(Z_FARG2, Address(Z_esp, 3 * Interpreter::stackElementSize)); // arg1
1262 __ z_maeb(Z_FRET, Z_FARG2, Address(Z_esp, 2 * Interpreter::stackElementSize));
1263 break;
1264 case Interpreter::java_lang_math_fmaD:
1265 __ mem2freg_opt(Z_FRET, Address(Z_esp, Interpreter::stackElementSize)); // result reg = arg3
1266 __ mem2freg_opt(Z_FARG2, Address(Z_esp, 5 * Interpreter::stackElementSize)); // arg1
1267 __ z_madb(Z_FRET, Z_FARG2, Address(Z_esp, 3 * Interpreter::stackElementSize));
1268 break;
1269 default: ShouldNotReachHere();
1270 }
1271 } else {
1272 // Load arguments
1273 assert(num_args <= 4, "passed in registers");
1274 if (double_precision) {
1275 int offset = (2 * num_args - 1) * Interpreter::stackElementSize;
1276 for (int i = 0; i < num_args; ++i) {
1277 __ mem2freg_opt(as_FloatRegister(Z_FARG1->encoding() + 2 * i), Address(Z_esp, offset));
1278 offset -= 2 * Interpreter::stackElementSize;
1279 }
1280 } else {
1281 int offset = num_args * Interpreter::stackElementSize;
1282 for (int i = 0; i < num_args; ++i) {
1283 __ mem2freg_opt(as_FloatRegister(Z_FARG1->encoding() + 2 * i), Address(Z_esp, offset));
1284 offset -= Interpreter::stackElementSize;
1285 }
1286 }
1287 // Call runtime
1288 __ save_return_pc(); // Save Z_R14.
1289 __ push_frame_abi160(0); // Without new frame the RT call could overwrite the saved Z_R14.
1290
1291 __ call_VM_leaf(runtime_entry);
1292
1293 __ pop_frame();
1294 __ restore_return_pc(); // Restore Z_R14.
1295 }
1296
1297 // Pop c2i arguments (if any) off when we return.
1298 __ resize_frame_absolute(Z_R10, Z_R0, true); // Cut the stack back to where the caller started.
1299
1300 __ z_br(Z_R14);
1301
1302 return entry;
1303 }
1304
1305 // Interpreter stub for calling a native method. (asm interpreter).
1306 // This sets up a somewhat different looking stack for calling the
1307 // native method than the typical interpreter frame setup.
1308 address TemplateInterpreterGenerator::generate_native_entry(bool synchronized) {
1309 // Determine code generation flags.
1310 bool inc_counter = UseCompiler || CountCompiledCalls;
1311
1312 // Interpreter entry for ordinary Java methods.
1313 //
1314 // Registers alive
1315 // Z_SP - stack pointer
1316 // Z_thread - JavaThread*
1317 // Z_method - callee's method (method to be invoked)
1318 // Z_esp - operand (or expression) stack pointer of caller. one slot above last arg.
1319 // Z_R10 - sender sp (before modifications, e.g. by c2i adapter
1320 // and as well by generate_fixed_frame below)
1321 // Z_R14 - return address to caller (call_stub or c2i_adapter)
1322 //
1323 // Registers updated
1324 // Z_SP - stack pointer
1325 // Z_fp - callee's framepointer
1326 // Z_esp - callee's operand stack pointer
1327 // points to the slot above the value on top
1328 // Z_locals - used to access locals: locals[i] := *(Z_locals - i*BytesPerWord)
1329 // Z_tos - integer result, if any
1330 // z_ftos - floating point result, if any
1331 //
1332 // Stack layout at this point:
1333 //
1334 // F1 [TOP_IJAVA_FRAME_ABI] <-- Z_SP, Z_R10 (Z_R10 will be below Z_SP if
1335 // frame was extended by c2i adapter)
1336 // [outgoing Java arguments] <-- Z_esp
1337 // ...
1338 // PARENT [PARENT_IJAVA_FRAME_ABI]
1339 // ...
1340 //
1341
1342 address entry_point = __ pc();
1343
1344 // Make sure registers are different!
1345 assert_different_registers(Z_thread, Z_method, Z_esp);
1346
1347 BLOCK_COMMENT("native_entry {");
1348
1349 // Make sure method is native and not abstract.
1350 #ifdef ASSERT
1351 address reentry = nullptr;
1352 { Label L;
1353 __ testbit(method_(access_flags), JVM_ACC_NATIVE_BIT);
1354 __ z_btrue(L);
1355 reentry = __ stop_chain_static(reentry, "tried to execute non-native method as native");
1356 __ bind(L);
1357 }
1358 { Label L;
1359 __ testbit(method_(access_flags), JVM_ACC_ABSTRACT_BIT);
1360 __ z_bfalse(L);
1361 reentry = __ stop_chain_static(reentry, "tried to execute abstract method as non-abstract");
1362 __ bind(L);
1363 }
1364 #endif // ASSERT
1365
1366 // Save the return PC into the callers frame for assertion in generate_fixed_frame.
1367 NOT_PRODUCT(__ save_return_pc(Z_R14));
1368
1369 // Generate the code to allocate the interpreter stack frame.
1370 generate_fixed_frame(true);
1371
1372 const Address do_not_unlock_if_synchronized(Z_thread, JavaThread::do_not_unlock_if_synchronized_offset());
1373 // Since at this point in the method invocation the exception handler
1374 // would try to exit the monitor of synchronized methods which hasn't
1375 // been entered yet, we set the thread local variable
1376 // _do_not_unlock_if_synchronized to true. If any exception was thrown by
1377 // runtime, exception handling i.e. unlock_if_synchronized_method will
1378 // check this thread local flag.
1379 __ z_mvi(do_not_unlock_if_synchronized, true);
1380
1381 // Increment invocation count and check for overflow.
1382 NearLabel invocation_counter_overflow;
1383 if (inc_counter) {
1384 generate_counter_incr(&invocation_counter_overflow);
1385 }
1386
1387 Label continue_after_compile;
1388 __ bind(continue_after_compile);
1389
1390 bang_stack_shadow_pages(true);
1391
1392 // Reset the _do_not_unlock_if_synchronized flag.
1393 __ z_mvi(do_not_unlock_if_synchronized, false);
1394
1395 // Check for synchronized methods.
1396 // This mst happen AFTER invocation_counter check and stack overflow check,
1397 // so method is not locked if overflows.
1398 if (synchronized) {
1399 lock_method();
1400 } else {
1401 // No synchronization necessary.
1402 #ifdef ASSERT
1403 { Label L;
1404 __ get_method(Z_R1_scratch);
1405 __ testbit(method2_(Z_R1_scratch, access_flags), JVM_ACC_SYNCHRONIZED_BIT);
1406 __ z_bfalse(L);
1407 reentry = __ stop_chain_static(reentry, "method needs synchronization");
1408 __ bind(L);
1409 }
1410 #endif // ASSERT
1411 }
1412
1413 // start execution
1414
1415 // jvmti support
1416 __ notify_method_entry();
1417
1418 //=============================================================================
1419 // Get and call the signature handler.
1420 const Register Rmethod = Z_tmp_2;
1421 const Register signature_handler_entry = Z_tmp_1;
1422 const Register Rresult_handler = Z_tmp_3;
1423 Label call_signature_handler;
1424
1425 assert_different_registers(Z_fp, Rmethod, signature_handler_entry, Rresult_handler);
1426 assert(Rresult_handler->is_nonvolatile(), "Rresult_handler must be in a non-volatile register");
1427
1428 // Reload method.
1429 __ get_method(Rmethod);
1430
1431 // Check for signature handler.
1432 __ load_and_test_long(signature_handler_entry, method2_(Rmethod, signature_handler));
1433 __ z_brne(call_signature_handler);
1434
1435 // Method has never been called. Either generate a specialized
1436 // handler or point to the slow one.
1437 __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::prepare_native_call),
1438 Rmethod);
1439
1440 // Reload method.
1441 __ get_method(Rmethod);
1442
1443 // Reload signature handler, it must have been created/assigned in the meantime.
1444 __ z_lg(signature_handler_entry, method2_(Rmethod, signature_handler));
1445
1446 __ bind(call_signature_handler);
1447
1448 // We have a TOP_IJAVA_FRAME here, which belongs to us.
1449 __ set_top_ijava_frame_at_SP_as_last_Java_frame(Z_SP, Z_R1/*tmp*/);
1450
1451 // Call signature handler and pass locals address in Z_ARG1.
1452 __ z_lgr(Z_ARG1, Z_locals);
1453 __ call_stub(signature_handler_entry);
1454 // Save result handler returned by signature handler.
1455 __ z_lgr(Rresult_handler, Z_RET);
1456
1457 // Reload method (the slow signature handler may block for GC).
1458 __ get_method(Rmethod);
1459
1460 // Pass mirror handle if static call.
1461 {
1462 Label method_is_not_static;
1463 __ testbit(method2_(Rmethod, access_flags), JVM_ACC_STATIC_BIT);
1464 __ z_bfalse(method_is_not_static);
1465 // Load mirror from interpreter frame.
1466 __ z_lg(Z_R1, _z_ijava_state_neg(mirror), Z_fp);
1467 // z_ijava_state.oop_temp = pool_holder->klass_part()->java_mirror();
1468 __ z_stg(Z_R1, oop_tmp_offset, Z_fp);
1469 // Pass handle to mirror as 2nd argument to JNI method.
1470 __ add2reg(Z_ARG2, oop_tmp_offset, Z_fp);
1471 __ bind(method_is_not_static);
1472 }
1473
1474 // Pass JNIEnv address as first parameter.
1475 __ add2reg(Z_ARG1, in_bytes(JavaThread::jni_environment_offset()), Z_thread);
1476
1477 // Note: last java frame has been set above already. The pc from there
1478 // is precise enough.
1479
1480 // Get native function entry point before we change the thread state.
1481 __ z_lg(Z_R1/*native_method_entry*/, method2_(Rmethod, native_function));
1482
1483 //=============================================================================
1484 // Transition from _thread_in_Java to _thread_in_native. As soon as
1485 // we make this change the safepoint code needs to be certain that
1486 // the last Java frame we established is good. The pc in that frame
1487 // just need to be near here not an actual return address.
1488 #ifdef ASSERT
1489 {
1490 NearLabel L;
1491 __ mem2reg_opt(Z_R14, Address(Z_thread, JavaThread::thread_state_offset()), false /*32 bits*/);
1492 __ compareU32_and_branch(Z_R14, _thread_in_Java, Assembler::bcondEqual, L);
1493 reentry = __ stop_chain_static(reentry, "Wrong thread state in native stub");
1494 __ bind(L);
1495 }
1496 #endif
1497
1498 // Memory ordering: Z does not reorder store/load with subsequent load. That's strong enough.
1499 __ set_thread_state(_thread_in_native);
1500
1501 //=============================================================================
1502 // Call the native method. Argument registers must not have been
1503 // overwritten since "__ call_stub(signature_handler);" (except for
1504 // ARG1 and ARG2 for static methods).
1505
1506 __ call_c(Z_R1/*native_method_entry*/);
1507
1508 // NOTE: frame::interpreter_frame_result() depends on these stores.
1509 __ z_stg(Z_RET, _z_ijava_state_neg(lresult), Z_fp);
1510 __ freg2mem_opt(Z_FRET, Address(Z_fp, _z_ijava_state_neg(fresult)));
1511 const Register Rlresult = signature_handler_entry;
1512 assert(Rlresult->is_nonvolatile(), "Rlresult must be in a non-volatile register");
1513 __ z_lgr(Rlresult, Z_RET);
1514
1515 // Z_method may no longer be valid, because of GC.
1516
1517 // Block, if necessary, before resuming in _thread_in_Java state.
1518 // In order for GC to work, don't clear the last_Java_sp until after
1519 // blocking.
1520
1521 //=============================================================================
1522 // Switch thread to "native transition" state before reading the
1523 // synchronization state. This additional state is necessary
1524 // because reading and testing the synchronization state is not
1525 // atomic w.r.t. GC, as this scenario demonstrates: Java thread A,
1526 // in _thread_in_native state, loads _not_synchronized and is
1527 // preempted. VM thread changes sync state to synchronizing and
1528 // suspends threads for GC. Thread A is resumed to finish this
1529 // native method, but doesn't block here since it didn't see any
1530 // synchronization is progress, and escapes.
1531
1532 __ set_thread_state(_thread_in_native_trans);
1533 if (!UseSystemMemoryBarrier) {
1534 __ z_fence();
1535 }
1536
1537 // Now before we return to java we must look for a current safepoint
1538 // (a new safepoint can not start since we entered native_trans).
1539 // We must check here because a current safepoint could be modifying
1540 // the callers registers right this moment.
1541
1542 // Check for safepoint operation in progress and/or pending suspend requests.
1543 {
1544 Label Continue, do_safepoint;
1545 __ safepoint_poll(do_safepoint, Z_R1);
1546 // Check for suspend.
1547 __ load_and_test_int(Z_R0/*suspend_flags*/, thread_(suspend_flags));
1548 __ z_bre(Continue); // 0 -> no flag set -> not suspended
1549 __ bind(do_safepoint);
1550 __ z_lgr(Z_ARG1, Z_thread);
1551 __ call_c(CAST_FROM_FN_PTR(address, JavaThread::check_special_condition_for_native_trans));
1552 __ bind(Continue);
1553 }
1554
1555 //=============================================================================
1556 // Back in Interpreter Frame.
1557
1558 // We are in thread_in_native_trans here and back in the normal
1559 // interpreter frame. We don't have to do anything special about
1560 // safepoints and we can switch to Java mode anytime we are ready.
1561
1562 // Note: frame::interpreter_frame_result has a dependency on how the
1563 // method result is saved across the call to post_method_exit. For
1564 // native methods it assumes that the non-FPU/non-void result is
1565 // saved in z_ijava_state.lresult and a FPU result in z_ijava_state.fresult. If
1566 // this changes then the interpreter_frame_result implementation
1567 // will need to be updated too.
1568
1569 //=============================================================================
1570 // Back in Java.
1571
1572 // Memory ordering: Z does not reorder store/load with subsequent
1573 // load. That's strong enough.
1574 __ set_thread_state(_thread_in_Java);
1575
1576 __ reset_last_Java_frame();
1577
1578 // We reset the JNI handle block only after unboxing the result; see below.
1579
1580 // The method register is junk from after the thread_in_native transition
1581 // until here. Also can't call_VM until the bcp has been
1582 // restored. Need bcp for throwing exception below so get it now.
1583 __ get_method(Rmethod);
1584
1585 // Restore Z_bcp to have legal interpreter frame,
1586 // i.e., bci == 0 <=> Z_bcp == code_base().
1587 __ z_lg(Z_bcp, Address(Rmethod, Method::const_offset())); // get constMethod
1588 __ add2reg(Z_bcp, in_bytes(ConstMethod::codes_offset())); // get codebase
1589
1590 if (CheckJNICalls) {
1591 // clear_pending_jni_exception_check
1592 __ clear_mem(Address(Z_thread, JavaThread::pending_jni_exception_check_fn_offset()), sizeof(oop));
1593 }
1594
1595 // Check if the native method returns an oop, and if so, move it
1596 // from the jni handle to z_ijava_state.oop_temp. This is
1597 // necessary, because we reset the jni handle block below.
1598 // NOTE: frame::interpreter_frame_result() depends on this, too.
1599 { NearLabel no_oop_result;
1600 __ load_absolute_address(Z_R1, AbstractInterpreter::result_handler(T_OBJECT));
1601 __ compareU64_and_branch(Z_R1, Rresult_handler, Assembler::bcondNotEqual, no_oop_result);
1602 __ resolve_jobject(Rlresult, /* tmp1 */ Rmethod, /* tmp2 */ Z_R1);
1603 __ z_stg(Rlresult, oop_tmp_offset, Z_fp);
1604 __ bind(no_oop_result);
1605 }
1606
1607 // Reset handle block.
1608 __ z_lg(Z_R1/*active_handles*/, thread_(active_handles));
1609 __ clear_mem(Address(Z_R1, JNIHandleBlock::top_offset()), 4);
1610
1611 // Handle exceptions (exception handling will handle unlocking!).
1612 {
1613 Label L;
1614 __ load_and_test_long(Z_R0/*pending_exception*/, thread_(pending_exception));
1615 __ z_bre(L);
1616 __ MacroAssembler::call_VM(noreg,
1617 CAST_FROM_FN_PTR(address,
1618 InterpreterRuntime::throw_pending_exception));
1619 __ should_not_reach_here();
1620 __ bind(L);
1621 }
1622
1623 if (synchronized) {
1624 Register Rfirst_monitor = Z_ARG2;
1625 __ add2reg(Rfirst_monitor, -(frame::z_ijava_state_size + (int)sizeof(BasicObjectLock)), Z_fp);
1626 #ifdef ASSERT
1627 NearLabel ok;
1628 __ z_lg(Z_R1, _z_ijava_state_neg(monitors), Z_fp);
1629 __ compareU64_and_branch(Rfirst_monitor, Z_R1, Assembler::bcondEqual, ok);
1630 reentry = __ stop_chain_static(reentry, "native_entry:unlock: inconsistent z_ijava_state.monitors");
1631 __ bind(ok);
1632 #endif
1633 __ unlock_object(Rfirst_monitor);
1634 }
1635
1636 // JVMTI support. Result has already been saved above to the frame.
1637 __ notify_method_exit(true/*native_method*/, ilgl, InterpreterMacroAssembler::NotifyJVMTI);
1638
1639 // Move native method result back into proper registers and return.
1640 __ mem2freg_opt(Z_FRET, Address(Z_fp, _z_ijava_state_neg(fresult)));
1641 __ mem2reg_opt(Z_RET, Address(Z_fp, _z_ijava_state_neg(lresult)));
1642 __ call_stub(Rresult_handler);
1643
1644 // Pop the native method's interpreter frame.
1645 __ pop_interpreter_frame(Z_R14 /*return_pc*/, Z_ARG2/*tmp1*/, Z_ARG3/*tmp2*/);
1646
1647 // Return to caller.
1648 __ z_br(Z_R14);
1649
1650 if (inc_counter) {
1651 // Handle overflow of counter and compile method.
1652 __ bind(invocation_counter_overflow);
1653 generate_counter_overflow(continue_after_compile);
1654 }
1655
1656 BLOCK_COMMENT("} native_entry");
1657
1658 return entry_point;
1659 }
1660
1661 //
1662 // Generic interpreted method entry to template interpreter.
1663 //
1664 address TemplateInterpreterGenerator::generate_normal_entry(bool synchronized) {
1665 address entry_point = __ pc();
1666
1667 bool inc_counter = UseCompiler || CountCompiledCalls;
1668
1669 // Interpreter entry for ordinary Java methods.
1670 //
1671 // Registers alive
1672 // Z_SP - stack pointer
1673 // Z_thread - JavaThread*
1674 // Z_method - callee's method (method to be invoked)
1675 // Z_esp - operand (or expression) stack pointer of caller. one slot above last arg.
1676 // Z_R10 - sender sp (before modifications, e.g. by c2i adapter
1677 // and as well by generate_fixed_frame below)
1678 // Z_R14 - return address to caller (call_stub or c2i_adapter)
1679 //
1680 // Registers updated
1681 // Z_SP - stack pointer
1682 // Z_fp - callee's framepointer
1683 // Z_esp - callee's operand stack pointer
1684 // points to the slot above the value on top
1685 // Z_locals - used to access locals: locals[i] := *(Z_locals - i*BytesPerWord)
1686 // Z_tos - integer result, if any
1687 // z_ftos - floating point result, if any
1688 //
1689 //
1690 // stack layout at this point:
1691 //
1692 // F1 [TOP_IJAVA_FRAME_ABI] <-- Z_SP, Z_R10 (Z_R10 will be below Z_SP if
1693 // frame was extended by c2i adapter)
1694 // [outgoing Java arguments] <-- Z_esp
1695 // ...
1696 // PARENT [PARENT_IJAVA_FRAME_ABI]
1697 // ...
1698 //
1699 // stack layout before dispatching the first bytecode:
1700 //
1701 // F0 [TOP_IJAVA_FRAME_ABI] <-- Z_SP
1702 // [operand stack] <-- Z_esp
1703 // monitor (optional, can grow)
1704 // [IJAVA_STATE]
1705 // F1 [PARENT_IJAVA_FRAME_ABI] <-- Z_fp (== *Z_SP)
1706 // [F0's locals] <-- Z_locals
1707 // [F1's operand stack]
1708 // [F1's monitors] (optional)
1709 // [IJAVA_STATE]
1710
1711 // Make sure registers are different!
1712 assert_different_registers(Z_thread, Z_method, Z_esp);
1713
1714 BLOCK_COMMENT("normal_entry {");
1715
1716 // Make sure method is not native and not abstract.
1717 // Rethink these assertions - they can be simplified and shared.
1718 #ifdef ASSERT
1719 address reentry = nullptr;
1720 { Label L;
1721 __ testbit(method_(access_flags), JVM_ACC_NATIVE_BIT);
1722 __ z_bfalse(L);
1723 reentry = __ stop_chain_static(reentry, "tried to execute native method as non-native");
1724 __ bind(L);
1725 }
1726 { Label L;
1727 __ testbit(method_(access_flags), JVM_ACC_ABSTRACT_BIT);
1728 __ z_bfalse(L);
1729 reentry = __ stop_chain_static(reentry, "tried to execute abstract method as non-abstract");
1730 __ bind(L);
1731 }
1732 #endif // ASSERT
1733
1734 // Save the return PC into the callers frame for assertion in generate_fixed_frame.
1735 NOT_PRODUCT(__ save_return_pc(Z_R14));
1736
1737 // Generate the code to allocate the interpreter stack frame.
1738 generate_fixed_frame(false);
1739
1740 const Address do_not_unlock_if_synchronized(Z_thread, JavaThread::do_not_unlock_if_synchronized_offset());
1741 // Since at this point in the method invocation the exception handler
1742 // would try to exit the monitor of synchronized methods which hasn't
1743 // been entered yet, we set the thread local variable
1744 // _do_not_unlock_if_synchronized to true. If any exception was thrown by
1745 // runtime, exception handling i.e. unlock_if_synchronized_method will
1746 // check this thread local flag.
1747 __ z_mvi(do_not_unlock_if_synchronized, true);
1748
1749 __ profile_parameters_type(Z_tmp_2, Z_ARG3, Z_ARG4);
1750
1751 // Increment invocation counter and check for overflow.
1752 //
1753 // Note: checking for negative value instead of overflow so we have a 'sticky'
1754 // overflow test (may be of importance as soon as we have true MT/MP).
1755 NearLabel invocation_counter_overflow;
1756 NearLabel Lcontinue;
1757 if (inc_counter) {
1758 generate_counter_incr(&invocation_counter_overflow);
1759 }
1760 __ bind(Lcontinue);
1761
1762 bang_stack_shadow_pages(false);
1763
1764 // Reset the _do_not_unlock_if_synchronized flag.
1765 __ z_mvi(do_not_unlock_if_synchronized, false);
1766
1767 // Check for synchronized methods.
1768 // Must happen AFTER invocation_counter check and stack overflow check,
1769 // so method is not locked if overflows.
1770 if (synchronized) {
1771 // Allocate monitor and lock method.
1772 lock_method();
1773 } else {
1774 #ifdef ASSERT
1775 { Label L;
1776 __ get_method(Z_R1_scratch);
1777 __ testbit(method2_(Z_R1_scratch, access_flags), JVM_ACC_SYNCHRONIZED_BIT);
1778 __ z_bfalse(L);
1779 reentry = __ stop_chain_static(reentry, "method needs synchronization");
1780 __ bind(L);
1781 }
1782 #endif // ASSERT
1783 }
1784
1785 // start execution
1786
1787 #ifdef ASSERT
1788 __ verify_esp(Z_esp, Z_R1_scratch);
1789 #endif
1790
1791 // jvmti support
1792 __ notify_method_entry();
1793
1794 // Start executing instructions.
1795 __ dispatch_next(vtos);
1796 // Dispatch_next does not return.
1797 DEBUG_ONLY(__ should_not_reach_here());
1798
1799 // Invocation counter overflow.
1800 if (inc_counter) {
1801 // Handle invocation counter overflow.
1802 __ bind(invocation_counter_overflow);
1803 generate_counter_overflow(Lcontinue);
1804 }
1805
1806 BLOCK_COMMENT("} normal_entry");
1807
1808 return entry_point;
1809 }
1810
1811
1812 /**
1813 * Method entry for static native methods:
1814 * int java.util.zip.CRC32.update(int crc, int b)
1815 */
1816 address TemplateInterpreterGenerator::generate_CRC32_update_entry() {
1817 assert(UseCRC32Intrinsics, "this intrinsic is not supported");
1818 uint64_t entry_off = __ offset();
1819 Label slow_path;
1820
1821 // If we need a safepoint check, generate full interpreter entry.
1822 __ safepoint_poll(slow_path, Z_R1);
1823
1824 BLOCK_COMMENT("CRC32_update {");
1825
1826 // We don't generate local frame and don't align stack because
1827 // we not even call stub code (we generate the code inline)
1828 // and there is no safepoint on this path.
1829
1830 // Load java parameters.
1831 // Z_esp is callers operand stack pointer, i.e. it points to the parameters.
1832 const Register argP = Z_esp;
1833 const Register crc = Z_ARG1; // crc value
1834 const Register data = Z_ARG2; // address of java byte value (kernel_crc32 needs address)
1835 const Register dataLen = Z_ARG3; // source data len (1 byte). Not used because calling the single-byte emitter.
1836 const Register table = Z_ARG4; // address of crc32 table
1837
1838 // Arguments are reversed on java expression stack.
1839 __ z_la(data, 3+1*wordSize, argP); // byte value (stack address).
1840 // Being passed as an int, the single byte is at offset +3.
1841 __ z_llgf(crc, 2 * wordSize, argP); // Current crc state, zero extend to 64 bit to have a clean register.
1842
1843 StubRoutines::zarch::generate_load_crc_table_addr(_masm, table);
1844 __ kernel_crc32_singleByte(crc, data, dataLen, table, Z_R1, true);
1845
1846 // Restore caller sp for c2i case.
1847 __ resize_frame_absolute(Z_R10, Z_R0, true); // Cut the stack back to where the caller started.
1848
1849 __ z_br(Z_R14);
1850
1851 BLOCK_COMMENT("} CRC32_update");
1852
1853 // Use a previously generated vanilla native entry as the slow path.
1854 BIND(slow_path);
1855 __ jump_to_entry(Interpreter::entry_for_kind(Interpreter::native), Z_R1);
1856 return __ addr_at(entry_off);
1857 }
1858
1859
1860 /**
1861 * Method entry for static native methods:
1862 * int java.util.zip.CRC32.updateBytes( int crc, byte[] b, int off, int len)
1863 * int java.util.zip.CRC32.updateByteBuffer(int crc, long* buf, int off, int len)
1864 */
1865 address TemplateInterpreterGenerator::generate_CRC32_updateBytes_entry(AbstractInterpreter::MethodKind kind) {
1866 assert(UseCRC32Intrinsics, "this intrinsic is not supported");
1867 uint64_t entry_off = __ offset();
1868 Label slow_path;
1869
1870 // If we need a safepoint check, generate full interpreter entry.
1871 __ safepoint_poll(slow_path, Z_R1);
1872
1873 // We don't generate local frame and don't align stack because
1874 // we call stub code and there is no safepoint on this path.
1875
1876 // Load parameters.
1877 // Z_esp is callers operand stack pointer, i.e. it points to the parameters.
1878 const Register argP = Z_esp;
1879 const Register crc = Z_ARG1; // crc value
1880 const Register data = Z_ARG2; // address of java byte array
1881 const Register dataLen = Z_ARG3; // source data len
1882 const Register table = Z_ARG4; // address of crc32 table
1883 const Register t0 = Z_R10; // work reg for kernel* emitters
1884 const Register t1 = Z_R11; // work reg for kernel* emitters
1885 const Register t2 = Z_R12; // work reg for kernel* emitters
1886 const Register t3 = Z_R13; // work reg for kernel* emitters
1887
1888 // Arguments are reversed on java expression stack.
1889 // Calculate address of start element.
1890 if (kind == Interpreter::java_util_zip_CRC32_updateByteBuffer) { // Used for "updateByteBuffer direct".
1891 // crc @ (SP + 5W) (32bit)
1892 // buf @ (SP + 3W) (64bit ptr to long array)
1893 // off @ (SP + 2W) (32bit)
1894 // dataLen @ (SP + 1W) (32bit)
1895 // data = buf + off
1896 BLOCK_COMMENT("CRC32_updateByteBuffer {");
1897 __ z_llgf(crc, 5*wordSize, argP); // current crc state
1898 __ z_lg(data, 3*wordSize, argP); // start of byte buffer
1899 __ z_agf(data, 2*wordSize, argP); // Add byte buffer offset.
1900 __ z_lgf(dataLen, 1*wordSize, argP); // #bytes to process
1901 } else { // Used for "updateBytes update".
1902 // crc @ (SP + 4W) (32bit)
1903 // buf @ (SP + 3W) (64bit ptr to byte array)
1904 // off @ (SP + 2W) (32bit)
1905 // dataLen @ (SP + 1W) (32bit)
1906 // data = buf + off + base_offset
1907 BLOCK_COMMENT("CRC32_updateBytes {");
1908 __ z_llgf(crc, 4*wordSize, argP); // current crc state
1909 __ z_lg(data, 3*wordSize, argP); // start of byte buffer
1910 __ z_agf(data, 2*wordSize, argP); // Add byte buffer offset.
1911 __ z_lgf(dataLen, 1*wordSize, argP); // #bytes to process
1912 __ z_aghi(data, arrayOopDesc::base_offset_in_bytes(T_BYTE));
1913 }
1914
1915 StubRoutines::zarch::generate_load_crc_table_addr(_masm, table);
1916
1917 __ resize_frame(-(6*8), Z_R0, true); // Resize frame to provide add'l space to spill 5 registers.
1918 __ z_stmg(t0, t3, 1*8, Z_SP); // Spill regs 10..13 to make them available as work registers.
1919 __ kernel_crc32_1word(crc, data, dataLen, table, t0, t1, t2, t3, true);
1920 __ z_lmg(t0, t3, 1*8, Z_SP); // Spill regs 10..13 back from stack.
1921
1922 // Restore caller sp for c2i case.
1923 __ resize_frame_absolute(Z_R10, Z_R0, true); // Cut the stack back to where the caller started.
1924
1925 __ z_br(Z_R14);
1926
1927 BLOCK_COMMENT("} CRC32_update{Bytes|ByteBuffer}");
1928
1929 // Use a previously generated vanilla native entry as the slow path.
1930 BIND(slow_path);
1931 __ jump_to_entry(Interpreter::entry_for_kind(Interpreter::native), Z_R1);
1932 return __ addr_at(entry_off);
1933 }
1934
1935
1936 /**
1937 * Method entry for intrinsic-candidate (non-native) methods:
1938 * int java.util.zip.CRC32C.updateBytes( int crc, byte[] b, int off, int end)
1939 * int java.util.zip.CRC32C.updateDirectByteBuffer(int crc, long* buf, int off, int end)
1940 * Unlike CRC32, CRC32C does not have any methods marked as native
1941 * CRC32C also uses an "end" variable instead of the length variable CRC32 uses
1942 */
1943 address TemplateInterpreterGenerator::generate_CRC32C_updateBytes_entry(AbstractInterpreter::MethodKind kind) {
1944 assert(UseCRC32CIntrinsics, "this intrinsic is not supported");
1945 uint64_t entry_off = __ offset();
1946
1947 // We don't generate local frame and don't align stack because
1948 // we call stub code and there is no safepoint on this path.
1949
1950 // Load parameters.
1951 // Z_esp is callers operand stack pointer, i.e. it points to the parameters.
1952 const Register argP = Z_esp;
1953 const Register crc = Z_ARG1; // crc value
1954 const Register data = Z_ARG2; // address of java byte array
1955 const Register dataLen = Z_ARG3; // source data len
1956 const Register table = Z_ARG4; // address of crc32 table
1957 const Register t0 = Z_R10; // work reg for kernel* emitters
1958 const Register t1 = Z_R11; // work reg for kernel* emitters
1959 const Register t2 = Z_R12; // work reg for kernel* emitters
1960 const Register t3 = Z_R13; // work reg for kernel* emitters
1961
1962 // Arguments are reversed on java expression stack.
1963 // Calculate address of start element.
1964 if (kind == Interpreter::java_util_zip_CRC32C_updateDirectByteBuffer) { // Used for "updateByteBuffer direct".
1965 // crc @ (SP + 5W) (32bit)
1966 // buf @ (SP + 3W) (64bit ptr to long array)
1967 // off @ (SP + 2W) (32bit)
1968 // dataLen @ (SP + 1W) (32bit)
1969 // data = buf + off
1970 BLOCK_COMMENT("CRC32C_updateDirectByteBuffer {");
1971 __ z_llgf(crc, 5*wordSize, argP); // current crc state
1972 __ z_lg(data, 3*wordSize, argP); // start of byte buffer
1973 __ z_agf(data, 2*wordSize, argP); // Add byte buffer offset.
1974 __ z_lgf(dataLen, 1*wordSize, argP); // #bytes to process, calculated as
1975 __ z_sgf(dataLen, Address(argP, 2*wordSize)); // (end_index - offset)
1976 } else { // Used for "updateBytes update".
1977 // crc @ (SP + 4W) (32bit)
1978 // buf @ (SP + 3W) (64bit ptr to byte array)
1979 // off @ (SP + 2W) (32bit)
1980 // dataLen @ (SP + 1W) (32bit)
1981 // data = buf + off + base_offset
1982 BLOCK_COMMENT("CRC32C_updateBytes {");
1983 __ z_llgf(crc, 4*wordSize, argP); // current crc state
1984 __ z_lg(data, 3*wordSize, argP); // start of byte buffer
1985 __ z_agf(data, 2*wordSize, argP); // Add byte buffer offset.
1986 __ z_lgf(dataLen, 1*wordSize, argP); // #bytes to process, calculated as
1987 __ z_sgf(dataLen, Address(argP, 2*wordSize)); // (end_index - offset)
1988 __ z_aghi(data, arrayOopDesc::base_offset_in_bytes(T_BYTE));
1989 }
1990
1991 StubRoutines::zarch::generate_load_crc32c_table_addr(_masm, table);
1992
1993 __ resize_frame(-(6*8), Z_R0, true); // Resize frame to provide add'l space to spill 5 registers.
1994 __ z_stmg(t0, t3, 1*8, Z_SP); // Spill regs 10..13 to make them available as work registers.
1995 __ kernel_crc32_1word(crc, data, dataLen, table, t0, t1, t2, t3, false);
1996 __ z_lmg(t0, t3, 1*8, Z_SP); // Spill regs 10..13 back from stack.
1997
1998 // Restore caller sp for c2i case.
1999 __ resize_frame_absolute(Z_R10, Z_R0, true); // Cut the stack back to where the caller started.
2000
2001 __ z_br(Z_R14);
2002
2003 BLOCK_COMMENT("} CRC32C_update{Bytes|DirectByteBuffer}");
2004 return __ addr_at(entry_off);
2005 }
2006
2007 // Not supported
2008 address TemplateInterpreterGenerator::generate_currentThread() { return nullptr; }
2009 address TemplateInterpreterGenerator::generate_Float_intBitsToFloat_entry() { return nullptr; }
2010 address TemplateInterpreterGenerator::generate_Float_floatToRawIntBits_entry() { return nullptr; }
2011 address TemplateInterpreterGenerator::generate_Double_longBitsToDouble_entry() { return nullptr; }
2012 address TemplateInterpreterGenerator::generate_Double_doubleToRawLongBits_entry() { return nullptr; }
2013 address TemplateInterpreterGenerator::generate_Float_float16ToFloat_entry() { return nullptr; }
2014 address TemplateInterpreterGenerator::generate_Float_floatToFloat16_entry() { return nullptr; }
2015
2016 void TemplateInterpreterGenerator::bang_stack_shadow_pages(bool native_call) {
2017 // Quick & dirty stack overflow checking: bang the stack & handle trap.
2018 // Note that we do the banging after the frame is setup, since the exception
2019 // handling code expects to find a valid interpreter frame on the stack.
2020 // Doing the banging earlier fails if the caller frame is not an interpreter
2021 // frame.
2022 // (Also, the exception throwing code expects to unlock any synchronized
2023 // method receiver, so do the banging after locking the receiver.)
2024
2025 // Bang each page in the shadow zone. We can't assume it's been done for
2026 // an interpreter frame with greater than a page of locals, so each page
2027 // needs to be checked. Only true for non-native. For native, we only bang the last page.
2028 const size_t page_size = os::vm_page_size();
2029 const int n_shadow_pages = (int)(StackOverflow::stack_shadow_zone_size()/page_size);
2030 const int start_page_num = native_call ? n_shadow_pages : 1;
2031 for (int pages = start_page_num; pages <= n_shadow_pages; pages++) {
2032 __ bang_stack_with_offset(pages*page_size);
2033 }
2034 }
2035
2036 //-----------------------------------------------------------------------------
2037 // Exceptions
2038
2039 void TemplateInterpreterGenerator::generate_throw_exception() {
2040
2041 BLOCK_COMMENT("throw_exception {");
2042
2043 // Entry point in previous activation (i.e., if the caller was interpreted).
2044 Interpreter::_rethrow_exception_entry = __ pc();
2045 __ z_lg(Z_fp, _z_abi(callers_sp), Z_SP); // Frame accessors use Z_fp.
2046 // Z_ARG1 (==Z_tos): exception
2047 // Z_ARG2 : Return address/pc that threw exception.
2048 __ restore_bcp(); // R13 points to call/send.
2049 __ restore_locals();
2050
2051 // Fallthrough, no need to restore Z_esp.
2052
2053 // Entry point for exceptions thrown within interpreter code.
2054 Interpreter::_throw_exception_entry = __ pc();
2055 // Expression stack is undefined here.
2056 // Z_ARG1 (==Z_tos): exception
2057 // Z_bcp: exception bcp
2058 __ verify_oop(Z_ARG1);
2059 __ z_lgr(Z_ARG2, Z_ARG1);
2060
2061 // Expression stack must be empty before entering the VM in case of
2062 // an exception.
2063 __ empty_expression_stack();
2064 // Find exception handler address and preserve exception oop.
2065 const Register Rpreserved_exc_oop = Z_tmp_1;
2066 __ call_VM(Rpreserved_exc_oop,
2067 CAST_FROM_FN_PTR(address, InterpreterRuntime::exception_handler_for_exception),
2068 Z_ARG2);
2069 // Z_RET: exception handler entry point
2070 // Z_bcp: bcp for exception handler
2071 __ push_ptr(Rpreserved_exc_oop); // Push exception which is now the only value on the stack.
2072 __ z_br(Z_RET); // Jump to exception handler (may be _remove_activation_entry!).
2073
2074 // If the exception is not handled in the current frame the frame is
2075 // removed and the exception is rethrown (i.e. exception
2076 // continuation is _rethrow_exception).
2077 //
2078 // Note: At this point the bci is still the bci for the instruction
2079 // which caused the exception and the expression stack is
2080 // empty. Thus, for any VM calls at this point, GC will find a legal
2081 // oop map (with empty expression stack).
2082
2083 //
2084 // JVMTI PopFrame support
2085 //
2086
2087 Interpreter::_remove_activation_preserving_args_entry = __ pc();
2088 __ z_lg(Z_fp, _z_parent_ijava_frame_abi(callers_sp), Z_SP);
2089 __ empty_expression_stack();
2090 // Set the popframe_processing bit in pending_popframe_condition
2091 // indicating that we are currently handling popframe, so that
2092 // call_VMs that may happen later do not trigger new popframe
2093 // handling cycles.
2094 __ load_sized_value(Z_tmp_1, Address(Z_thread, JavaThread::popframe_condition_offset()), 4, false /*signed*/);
2095 __ z_oill(Z_tmp_1, JavaThread::popframe_processing_bit);
2096 __ z_sty(Z_tmp_1, thread_(popframe_condition));
2097
2098 {
2099 // Check to see whether we are returning to a deoptimized frame.
2100 // (The PopFrame call ensures that the caller of the popped frame is
2101 // either interpreted or compiled and deoptimizes it if compiled.)
2102 // In this case, we can't call dispatch_next() after the frame is
2103 // popped, but instead must save the incoming arguments and restore
2104 // them after deoptimization has occurred.
2105 //
2106 // Note that we don't compare the return PC against the
2107 // deoptimization blob's unpack entry because of the presence of
2108 // adapter frames in C2.
2109 NearLabel caller_not_deoptimized;
2110 __ z_lg(Z_ARG1, _z_parent_ijava_frame_abi(return_pc), Z_fp);
2111 __ call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::interpreter_contains), Z_ARG1);
2112 __ compareU64_and_branch(Z_RET, (intptr_t)0, Assembler::bcondNotEqual, caller_not_deoptimized);
2113
2114 // Compute size of arguments for saving when returning to
2115 // deoptimized caller.
2116 __ get_method(Z_ARG2);
2117 __ z_lg(Z_ARG2, Address(Z_ARG2, Method::const_offset()));
2118 __ z_llgh(Z_ARG2, Address(Z_ARG2, ConstMethod::size_of_parameters_offset()));
2119 __ z_sllg(Z_ARG2, Z_ARG2, Interpreter::logStackElementSize); // slots 2 bytes
2120 __ restore_locals();
2121 // Compute address of args to be saved.
2122 __ z_lgr(Z_ARG3, Z_locals);
2123 __ z_slgr(Z_ARG3, Z_ARG2);
2124 __ add2reg(Z_ARG3, wordSize);
2125 // Save these arguments.
2126 __ call_VM_leaf(CAST_FROM_FN_PTR(address, Deoptimization::popframe_preserve_args),
2127 Z_thread, Z_ARG2, Z_ARG3);
2128
2129 __ remove_activation(vtos, Z_R14,
2130 /* throw_monitor_exception */ false,
2131 /* install_monitor_exception */ false,
2132 /* notify_jvmdi */ false);
2133
2134 // Inform deoptimization that it is responsible for restoring
2135 // these arguments.
2136 __ store_const(thread_(popframe_condition),
2137 JavaThread::popframe_force_deopt_reexecution_bit,
2138 Z_tmp_1, false);
2139
2140 // Continue in deoptimization handler.
2141 __ z_br(Z_R14);
2142
2143 __ bind(caller_not_deoptimized);
2144 }
2145
2146 // Clear the popframe condition flag.
2147 __ clear_mem(thread_(popframe_condition), sizeof(int));
2148
2149 __ remove_activation(vtos,
2150 noreg, // Retaddr is not used.
2151 false, // throw_monitor_exception
2152 false, // install_monitor_exception
2153 false); // notify_jvmdi
2154 __ z_lg(Z_fp, _z_abi(callers_sp), Z_SP); // Restore frame pointer.
2155 __ restore_bcp();
2156 __ restore_locals();
2157 __ restore_esp();
2158 // The method data pointer was incremented already during
2159 // call profiling. We have to restore the mdp for the current bcp.
2160 if (ProfileInterpreter) {
2161 __ set_method_data_pointer_for_bcp();
2162 }
2163 #if INCLUDE_JVMTI
2164 {
2165 Label L_done;
2166
2167 __ z_cli(0, Z_bcp, Bytecodes::_invokestatic);
2168 __ z_brc(Assembler::bcondNotEqual, L_done);
2169
2170 // The member name argument must be restored if _invokestatic is
2171 // re-executed after a PopFrame call. Detect such a case in the
2172 // InterpreterRuntime function and return the member name
2173 // argument, or null.
2174 __ z_lg(Z_ARG2, Address(Z_locals));
2175 __ get_method(Z_ARG3);
2176 __ call_VM(Z_tmp_1,
2177 CAST_FROM_FN_PTR(address, InterpreterRuntime::member_name_arg_or_null),
2178 Z_ARG2, Z_ARG3, Z_bcp);
2179
2180 __ z_ltgr(Z_tmp_1, Z_tmp_1);
2181 __ z_brc(Assembler::bcondEqual, L_done);
2182
2183 __ z_stg(Z_tmp_1, Address(Z_esp, wordSize));
2184 __ bind(L_done);
2185 }
2186 #endif // INCLUDE_JVMTI
2187 __ dispatch_next(vtos);
2188 // End of PopFrame support.
2189 Interpreter::_remove_activation_entry = __ pc();
2190
2191 // In between activations - previous activation type unknown yet
2192 // compute continuation point - the continuation point expects the
2193 // following registers set up:
2194 //
2195 // Z_ARG1 (==Z_tos): exception
2196 // Z_ARG2 : return address/pc that threw exception
2197
2198 Register return_pc = Z_tmp_1;
2199 Register handler = Z_tmp_2;
2200 assert(return_pc->is_nonvolatile(), "use non-volatile reg. to preserve exception pc");
2201 assert(handler->is_nonvolatile(), "use non-volatile reg. to handler pc");
2202 __ asm_assert_ijava_state_magic(return_pc/*tmp*/); // The top frame should be an interpreter frame.
2203 __ z_lg(return_pc, _z_parent_ijava_frame_abi(return_pc), Z_fp);
2204
2205 // Moved removing the activation after VM call, because the new top
2206 // frame does not necessarily have the z_abi_160 required for a VM
2207 // call (e.g. if it is compiled).
2208
2209 __ super_call_VM_leaf(CAST_FROM_FN_PTR(address,
2210 SharedRuntime::exception_handler_for_return_address),
2211 Z_thread, return_pc);
2212 __ z_lgr(handler, Z_RET); // Save exception handler.
2213
2214 // Preserve exception over this code sequence.
2215 __ pop_ptr(Z_ARG1);
2216 __ set_vm_result(Z_ARG1);
2217 // Remove the activation (without doing throws on illegalMonitorExceptions).
2218 __ remove_activation(vtos, noreg/*ret.pc already loaded*/, false/*throw exc*/, true/*install exc*/, false/*notify jvmti*/);
2219 __ z_lg(Z_fp, _z_abi(callers_sp), Z_SP); // Restore frame pointer.
2220
2221 __ get_vm_result(Z_ARG1); // Restore exception.
2222 __ verify_oop(Z_ARG1);
2223 __ z_lgr(Z_ARG2, return_pc); // Restore return address.
2224
2225 #ifdef ASSERT
2226 // The return_pc in the new top frame is dead... at least that's my
2227 // current understanding. To assert this I overwrite it.
2228 // Note: for compiled frames the handler is the deopt blob
2229 // which writes Z_ARG2 into the return_pc slot.
2230 __ load_const_optimized(return_pc, 0xb00b1);
2231 __ z_stg(return_pc, _z_parent_ijava_frame_abi(return_pc), Z_SP);
2232 #endif
2233
2234 // Z_ARG1 (==Z_tos): exception
2235 // Z_ARG2 : return address/pc that threw exception
2236
2237 // Note that an "issuing PC" is actually the next PC after the call.
2238 __ z_br(handler); // Jump to exception handler of caller.
2239
2240 BLOCK_COMMENT("} throw_exception");
2241 }
2242
2243 //
2244 // JVMTI ForceEarlyReturn support
2245 //
2246 address TemplateInterpreterGenerator::generate_earlyret_entry_for (TosState state) {
2247 address entry = __ pc();
2248
2249 BLOCK_COMMENT("earlyret_entry {");
2250
2251 __ z_lg(Z_fp, _z_parent_ijava_frame_abi(callers_sp), Z_SP);
2252 __ restore_bcp();
2253 __ restore_locals();
2254 __ restore_esp();
2255 __ empty_expression_stack();
2256 __ load_earlyret_value(state);
2257
2258 Register RjvmtiState = Z_tmp_1;
2259 __ z_lg(RjvmtiState, thread_(jvmti_thread_state));
2260 __ store_const(Address(RjvmtiState, JvmtiThreadState::earlyret_state_offset()),
2261 JvmtiThreadState::earlyret_inactive, 4, 4, Z_R0_scratch);
2262
2263 if (state == itos) {
2264 // Narrow result if state is itos but result type is smaller.
2265 // Need to narrow in the return bytecode rather than in generate_return_entry
2266 // since compiled code callers expect the result to already be narrowed.
2267 __ narrow(Z_tos, Z_tmp_1); /* fall through */
2268 }
2269 __ remove_activation(state,
2270 Z_tmp_1, // retaddr
2271 false, // throw_monitor_exception
2272 false, // install_monitor_exception
2273 true); // notify_jvmdi
2274 __ z_br(Z_tmp_1);
2275
2276 BLOCK_COMMENT("} earlyret_entry");
2277
2278 return entry;
2279 }
2280
2281 //-----------------------------------------------------------------------------
2282 // Helper for vtos entry point generation.
2283
2284 void TemplateInterpreterGenerator::set_vtos_entry_points(Template* t,
2285 address& bep,
2286 address& cep,
2287 address& sep,
2288 address& aep,
2289 address& iep,
2290 address& lep,
2291 address& fep,
2292 address& dep,
2293 address& vep) {
2294 assert(t->is_valid() && t->tos_in() == vtos, "illegal template");
2295 Label L;
2296 aep = __ pc(); __ push_ptr(); __ z_bru(L);
2297 fep = __ pc(); __ push_f(); __ z_bru(L);
2298 dep = __ pc(); __ push_d(); __ z_bru(L);
2299 lep = __ pc(); __ push_l(); __ z_bru(L);
2300 bep = cep = sep =
2301 iep = __ pc(); __ push_i();
2302 vep = __ pc();
2303 __ bind(L);
2304 generate_and_dispatch(t);
2305 }
2306
2307 //-----------------------------------------------------------------------------
2308
2309 #ifndef PRODUCT
2310 address TemplateInterpreterGenerator::generate_trace_code(TosState state) {
2311 address entry = __ pc();
2312 NearLabel counter_below_trace_threshold;
2313
2314 if (TraceBytecodesAt > 0) {
2315 // Skip runtime call, if the trace threshold is not yet reached.
2316 __ load_absolute_address(Z_tmp_1, (address)&BytecodeCounter::_counter_value);
2317 __ load_absolute_address(Z_tmp_2, (address)&TraceBytecodesAt);
2318 __ load_sized_value(Z_tmp_1, Address(Z_tmp_1), 4, false /*signed*/);
2319 __ load_sized_value(Z_tmp_2, Address(Z_tmp_2), 8, false /*signed*/);
2320 __ compareU64_and_branch(Z_tmp_1, Z_tmp_2, Assembler::bcondLow, counter_below_trace_threshold);
2321 }
2322
2323 int offset2 = state == ltos || state == dtos ? 2 : 1;
2324
2325 __ push(state);
2326 // Preserved return pointer is in Z_R14.
2327 // InterpreterRuntime::trace_bytecode() preserved and returns the value passed as second argument.
2328 __ z_lgr(Z_ARG2, Z_R14);
2329 __ z_lg(Z_ARG3, Address(Z_esp, Interpreter::expr_offset_in_bytes(0)));
2330 if (WizardMode) {
2331 __ z_lgr(Z_ARG4, Z_esp); // Trace Z_esp in WizardMode.
2332 } else {
2333 __ z_lg(Z_ARG4, Address(Z_esp, Interpreter::expr_offset_in_bytes(offset2)));
2334 }
2335 __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::trace_bytecode), Z_ARG2, Z_ARG3, Z_ARG4);
2336 __ z_lgr(Z_R14, Z_RET); // Estore return address (see above).
2337 __ pop(state);
2338
2339 __ bind(counter_below_trace_threshold);
2340 __ z_br(Z_R14); // return
2341
2342 return entry;
2343 }
2344
2345 // Make feasible for old CPUs.
2346 void TemplateInterpreterGenerator::count_bytecode() {
2347 __ load_absolute_address(Z_R1_scratch, (address) &BytecodeCounter::_counter_value);
2348 __ add2mem_32(Address(Z_R1_scratch), 1, Z_R0_scratch);
2349 }
2350
2351 void TemplateInterpreterGenerator::histogram_bytecode(Template * t) {
2352 __ load_absolute_address(Z_R1_scratch, (address)&BytecodeHistogram::_counters[ t->bytecode() ]);
2353 __ add2mem_32(Address(Z_R1_scratch), 1, Z_tmp_1);
2354 }
2355
2356 void TemplateInterpreterGenerator::histogram_bytecode_pair(Template * t) {
2357 Address index_addr(Z_tmp_1, (intptr_t) 0);
2358 Register index = Z_tmp_2;
2359
2360 // Load previous index.
2361 __ load_absolute_address(Z_tmp_1, (address) &BytecodePairHistogram::_index);
2362 __ mem2reg_opt(index, index_addr, false);
2363
2364 // Mask with current bytecode and store as new previous index.
2365 __ z_srl(index, BytecodePairHistogram::log2_number_of_codes);
2366 __ load_const_optimized(Z_R0_scratch,
2367 (int)t->bytecode() << BytecodePairHistogram::log2_number_of_codes);
2368 __ z_or(index, Z_R0_scratch);
2369 __ reg2mem_opt(index, index_addr, false);
2370
2371 // Load counter array's address.
2372 __ z_lgfr(index, index); // Sign extend for addressing.
2373 __ z_sllg(index, index, LogBytesPerInt); // index2bytes
2374 __ load_absolute_address(Z_R1_scratch,
2375 (address) &BytecodePairHistogram::_counters);
2376 // Add index and increment counter.
2377 __ z_agr(Z_R1_scratch, index);
2378 __ add2mem_32(Address(Z_R1_scratch), 1, Z_tmp_1);
2379 }
2380
2381 void TemplateInterpreterGenerator::trace_bytecode(Template* t) {
2382 // Call a little run-time stub to avoid blow-up for each bytecode.
2383 // The run-time runtime saves the right registers, depending on
2384 // the tosca in-state for the given template.
2385 address entry = Interpreter::trace_code(t->tos_in());
2386 guarantee(entry != nullptr, "entry must have been generated");
2387 __ call_stub(entry);
2388 }
2389
2390 void TemplateInterpreterGenerator::stop_interpreter_at() {
2391 NearLabel L;
2392
2393 __ load_absolute_address(Z_tmp_1, (address)&BytecodeCounter::_counter_value);
2394 __ load_absolute_address(Z_tmp_2, (address)&StopInterpreterAt);
2395 __ load_sized_value(Z_tmp_1, Address(Z_tmp_1), 4, false /*signed*/);
2396 __ load_sized_value(Z_tmp_2, Address(Z_tmp_2), 8, false /*signed*/);
2397 __ compareU64_and_branch(Z_tmp_1, Z_tmp_2, Assembler::bcondLow, L);
2398 assert(Z_tmp_1->is_nonvolatile(), "must be nonvolatile to preserve Z_tos");
2399 assert(Z_F8->is_nonvolatile(), "must be nonvolatile to preserve Z_ftos");
2400 __ z_lgr(Z_tmp_1, Z_tos); // Save tos.
2401 __ z_lgr(Z_tmp_2, Z_bytecode); // Save Z_bytecode.
2402 __ z_ldr(Z_F8, Z_ftos); // Save ftos.
2403 // Use -XX:StopInterpreterAt=<num> to set the limit
2404 // and break at breakpoint().
2405 __ call_VM(noreg, CAST_FROM_FN_PTR(address, breakpoint), false);
2406 __ z_lgr(Z_tos, Z_tmp_1); // Restore tos.
2407 __ z_lgr(Z_bytecode, Z_tmp_2); // Save Z_bytecode.
2408 __ z_ldr(Z_ftos, Z_F8); // Restore ftos.
2409 __ bind(L);
2410 }
2411
2412 #endif // !PRODUCT