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 //
725 // Helpers for commoning out cases in the various type of method entries.
726 //
727
728 // Increment invocation count & check for overflow.
729 //
730 // Note: checking for negative value instead of overflow
731 // so we have a 'sticky' overflow test.
732 //
733 // Z_ARG2: method (see generate_fixed_frame())
734 //
735 void TemplateInterpreterGenerator::generate_counter_incr(Label* overflow) {
736 Label done;
737 Register method = Z_ARG2; // Generate_fixed_frame() copies Z_method into Z_ARG2.
738 Register m_counters = Z_ARG4;
739
740 BLOCK_COMMENT("counter_incr {");
741
742 // Note: In tiered we increment either counters in method or in MDO depending
743 // if we are profiling or not.
744 int increment = InvocationCounter::count_increment;
745 if (ProfileInterpreter) {
746 NearLabel no_mdo;
747 Register mdo = m_counters;
748 // Are we profiling?
749 __ load_and_test_long(mdo, method2_(method, method_data));
750 __ branch_optimized(Assembler::bcondZero, no_mdo);
751 // Increment counter in the MDO.
752 const Address mdo_invocation_counter(mdo, MethodData::invocation_counter_offset() +
753 InvocationCounter::counter_offset());
754 const Address mask(mdo, MethodData::invoke_mask_offset());
755 __ increment_mask_and_jump(mdo_invocation_counter, increment, mask,
756 Z_R1_scratch, false, Assembler::bcondZero,
757 overflow);
758 __ z_bru(done);
759 __ bind(no_mdo);
760 }
761
762 // Increment counter in MethodCounters.
763 const Address invocation_counter(m_counters,
764 MethodCounters::invocation_counter_offset() +
765 InvocationCounter::counter_offset());
766 // Get address of MethodCounters object.
767 __ get_method_counters(method, m_counters, done);
768 const Address mask(m_counters, MethodCounters::invoke_mask_offset());
769 __ increment_mask_and_jump(invocation_counter,
770 increment, mask,
771 Z_R1_scratch, false, Assembler::bcondZero,
772 overflow);
773
774 __ bind(done);
775
776 BLOCK_COMMENT("} counter_incr");
777 }
778
779 void TemplateInterpreterGenerator::generate_counter_overflow(Label& do_continue) {
780 // InterpreterRuntime::frequency_counter_overflow takes two
781 // arguments, the first (thread) is passed by call_VM, the second
782 // indicates if the counter overflow occurs at a backwards branch
783 // (null bcp). We pass zero for it. The call returns the address
784 // of the verified entry point for the method or null if the
785 // compilation did not complete (either went background or bailed
786 // out).
787 __ clear_reg(Z_ARG2);
788 __ call_VM(noreg,
789 CAST_FROM_FN_PTR(address, InterpreterRuntime::frequency_counter_overflow),
790 Z_ARG2);
791 __ z_bru(do_continue);
792 }
793
794 void TemplateInterpreterGenerator::generate_stack_overflow_check(Register frame_size, Register tmp1) {
795 Register tmp2 = Z_R1_scratch;
796 const int page_size = (int)os::vm_page_size();
797 NearLabel after_frame_check;
798
799 BLOCK_COMMENT("stack_overflow_check {");
800
801 assert_different_registers(frame_size, tmp1);
802
803 // Stack banging is sufficient overflow check if frame_size < page_size.
804 if (Immediate::is_uimm(page_size, 15)) {
805 __ z_chi(frame_size, page_size);
806 __ z_brl(after_frame_check);
807 } else {
808 __ load_const_optimized(tmp1, page_size);
809 __ compareU32_and_branch(frame_size, tmp1, Assembler::bcondLow, after_frame_check);
810 }
811
812 // Get the stack base, and in debug, verify it is non-zero.
813 __ z_lg(tmp1, thread_(stack_base));
814 #ifdef ASSERT
815 address reentry = nullptr;
816 NearLabel base_not_zero;
817 __ compareU64_and_branch(tmp1, (intptr_t)0L, Assembler::bcondNotEqual, base_not_zero);
818 reentry = __ stop_chain_static(reentry, "stack base is zero in generate_stack_overflow_check");
819 __ bind(base_not_zero);
820 #endif
821
822 // Get the stack size, and in debug, verify it is non-zero.
823 assert(sizeof(size_t) == sizeof(intptr_t), "wrong load size");
824 __ z_lg(tmp2, thread_(stack_size));
825 #ifdef ASSERT
826 NearLabel size_not_zero;
827 __ compareU64_and_branch(tmp2, (intptr_t)0L, Assembler::bcondNotEqual, size_not_zero);
828 reentry = __ stop_chain_static(reentry, "stack size is zero in generate_stack_overflow_check");
829 __ bind(size_not_zero);
830 #endif
831
832 // Compute the beginning of the protected zone minus the requested frame size.
833 __ z_sgr(tmp1, tmp2);
834 __ add2reg(tmp1, StackOverflow::stack_guard_zone_size());
835
836 // Add in the size of the frame (which is the same as subtracting it from the
837 // SP, which would take another register.
838 __ z_agr(tmp1, frame_size);
839
840 // The frame is greater than one page in size, so check against
841 // the bottom of the stack.
842 __ compareU64_and_branch(Z_SP, tmp1, Assembler::bcondHigh, after_frame_check);
843
844 // The stack will overflow, throw an exception.
845
846 // Restore SP to sender's sp. This is necessary if the sender's frame is an
847 // extended compiled frame (see gen_c2i_adapter()) and safer anyway in case of
848 // JSR292 adaptations.
849 __ resize_frame_absolute(Z_R10, tmp1, true/*load_fp*/);
850
851 // Note also that the restored frame is not necessarily interpreted.
852 // Use the shared runtime version of the StackOverflowError.
853 assert(SharedRuntime::throw_StackOverflowError_entry() != nullptr, "stub not yet generated");
854 AddressLiteral stub(SharedRuntime::throw_StackOverflowError_entry());
855 __ load_absolute_address(tmp1, SharedRuntime::throw_StackOverflowError_entry());
856 __ z_br(tmp1);
857
858 // If you get to here, then there is enough stack space.
859 __ bind(after_frame_check);
860
861 BLOCK_COMMENT("} stack_overflow_check");
862 }
863
864 // Allocate monitor and lock method (asm interpreter).
865 //
866 // Args:
867 // Z_locals: locals
868
869 void TemplateInterpreterGenerator::lock_method(void) {
870
871 BLOCK_COMMENT("lock_method {");
872
873 // Synchronize method.
874 const Register method = Z_tmp_2;
875 __ get_method(method);
876
877 #ifdef ASSERT
878 address reentry = nullptr;
879 {
880 Label L;
881 __ testbit(method2_(method, access_flags), JVM_ACC_SYNCHRONIZED_BIT);
882 __ z_btrue(L);
883 reentry = __ stop_chain_static(reentry, "method doesn't need synchronization");
884 __ bind(L);
885 }
886 #endif // ASSERT
887
888 // Get synchronization object.
889 const Register object = Z_tmp_2;
890
891 {
892 Label done;
893 Label static_method;
894
895 __ testbit(method2_(method, access_flags), JVM_ACC_STATIC_BIT);
896 __ z_btrue(static_method);
897
898 // non-static method: Load receiver obj from stack.
899 __ mem2reg_opt(object, Address(Z_locals, Interpreter::local_offset_in_bytes(0)));
900 __ z_bru(done);
901
902 __ bind(static_method);
903
904 // Lock the java mirror.
905 // Load mirror from interpreter frame.
906 __ z_lg(object, _z_ijava_state_neg(mirror), Z_fp);
907
908 #ifdef ASSERT
909 {
910 NearLabel L;
911 __ compare64_and_branch(object, (intptr_t) 0, Assembler::bcondNotEqual, L);
912 reentry = __ stop_chain_static(reentry, "synchronization object is null");
913 __ bind(L);
914 }
915 #endif // ASSERT
916
917 __ bind(done);
918 }
919
920 __ add_monitor_to_stack(true, Z_ARG3, Z_ARG4, Z_ARG5); // Allocate monitor elem.
921 // Store object and lock it.
922 __ get_monitors(Z_tmp_1);
923 __ reg2mem_opt(object, Address(Z_tmp_1, BasicObjectLock::obj_offset()));
924 __ lock_object(Z_tmp_1, object);
925
926 BLOCK_COMMENT("} lock_method");
927 }
928
929 // Generate a fixed interpreter frame. This is identical setup for
930 // interpreted methods and for native methods hence the shared code.
931 //
932 // Registers alive
933 // Z_thread - JavaThread*
934 // Z_SP - old stack pointer
935 // Z_method - callee's method
936 // Z_esp - parameter list (slot 'above' last param)
937 // Z_R14 - return pc, to be stored in caller's frame
938 // Z_R10 - sender sp, note: Z_tmp_1 is Z_R10!
939 //
940 // Registers updated
941 // Z_SP - new stack pointer
942 // Z_esp - callee's operand stack pointer
943 // points to the slot above the value on top
944 // Z_locals - used to access locals: locals[i] := *(Z_locals - i*BytesPerWord)
945 // Z_bcp - the bytecode pointer
946 // Z_fp - the frame pointer, thereby killing Z_method
947 // Z_ARG2 - copy of Z_method
948 //
949 void TemplateInterpreterGenerator::generate_fixed_frame(bool native_call) {
950
951 // stack layout
952 //
953 // F1 [TOP_IJAVA_FRAME_ABI] <-- Z_SP, Z_R10 (see note below)
954 // [F1's operand stack (unused)]
955 // [F1's outgoing Java arguments] <-- Z_esp
956 // [F1's operand stack (non args)]
957 // [monitors] (optional)
958 // [IJAVA_STATE]
959 //
960 // F2 [PARENT_IJAVA_FRAME_ABI]
961 // ...
962 //
963 // 0x000
964 //
965 // Note: Z_R10, the sender sp, will be below Z_SP if F1 was extended by a c2i adapter.
966
967 //=============================================================================
968 // Allocate space for locals other than the parameters, the
969 // interpreter state, monitors, and the expression stack.
970
971 const Register local_count = Z_ARG5;
972 const Register fp = Z_tmp_2;
973 const Register const_method = Z_ARG1;
974
975 BLOCK_COMMENT("generate_fixed_frame {");
976 {
977 // local registers
978 const Register top_frame_size = Z_ARG2;
979 const Register sp_after_resize = Z_ARG3;
980 const Register max_stack = Z_ARG4;
981
982 __ z_lg(const_method, Address(Z_method, Method::const_offset()));
983 __ z_llgh(max_stack, Address(const_method, ConstMethod::size_of_parameters_offset()));
984 __ z_sllg(Z_locals /*parameter_count bytes*/, max_stack /*parameter_count*/, LogBytesPerWord);
985
986 if (native_call) {
987 // If we're calling a native method, we replace max_stack (which is
988 // zero) with space for the worst-case signature handler varargs
989 // vector, which is:
990 // max_stack = max(Argument::n_register_parameters, parameter_count+2);
991 //
992 // We add two slots to the parameter_count, one for the jni
993 // environment and one for a possible native mirror. We allocate
994 // space for at least the number of ABI registers, even though
995 // InterpreterRuntime::slow_signature_handler won't write more than
996 // parameter_count+2 words when it creates the varargs vector at the
997 // top of the stack. The generated slow signature handler will just
998 // load trash into registers beyond the necessary number. We're
999 // still going to cut the stack back by the ABI register parameter
1000 // count so as to get SP+16 pointing at the ABI outgoing parameter
1001 // area, so we need to allocate at least that much even though we're
1002 // going to throw it away.
1003 //
1004 __ add2reg(max_stack, 2);
1005
1006 NearLabel passing_args_on_stack;
1007
1008 // max_stack in bytes
1009 __ z_sllg(max_stack, max_stack, LogBytesPerWord);
1010
1011 int argument_registers_in_bytes = Argument::n_register_parameters << LogBytesPerWord;
1012 __ compare64_and_branch(max_stack, argument_registers_in_bytes, Assembler::bcondNotLow, passing_args_on_stack);
1013
1014 __ load_const_optimized(max_stack, argument_registers_in_bytes);
1015
1016 __ bind(passing_args_on_stack);
1017 } else {
1018 // !native_call
1019 // local_count = method->constMethod->max_locals();
1020 __ z_llgh(local_count, Address(const_method, ConstMethod::size_of_locals_offset()));
1021
1022 // Calculate number of non-parameter locals (in slots):
1023 __ z_sgr(local_count, max_stack);
1024
1025 // max_stack = method->max_stack();
1026 __ z_llgh(max_stack, Address(const_method, ConstMethod::max_stack_offset()));
1027 // max_stack in bytes
1028 __ z_sllg(max_stack, max_stack, LogBytesPerWord);
1029 }
1030
1031 // Resize (i.e. normally shrink) the top frame F1 ...
1032 // F1 [TOP_IJAVA_FRAME_ABI] <-- Z_SP, Z_R10
1033 // F1's operand stack (free)
1034 // ...
1035 // F1's operand stack (free) <-- Z_esp
1036 // F1's outgoing Java arg m
1037 // ...
1038 // F1's outgoing Java arg 0
1039 // ...
1040 //
1041 // ... into a parent frame (Z_R10 holds F1's SP before any modification, see also above)
1042 //
1043 // +......................+
1044 // : : <-- Z_R10, saved below as F0's z_ijava_state.sender_sp
1045 // : :
1046 // F1 [PARENT_IJAVA_FRAME_ABI] <-- Z_SP \
1047 // F0's non arg local | = delta
1048 // ... |
1049 // F0's non arg local <-- Z_esp /
1050 // F1's outgoing Java arg m
1051 // ...
1052 // F1's outgoing Java arg 0
1053 // ...
1054 //
1055 // then push the new top frame F0.
1056 //
1057 // F0 [TOP_IJAVA_FRAME_ABI] = frame::z_top_ijava_frame_abi_size \
1058 // [operand stack] = max_stack | = top_frame_size
1059 // [IJAVA_STATE] = frame::z_ijava_state_size /
1060
1061 // sp_after_resize = Z_esp - delta
1062 //
1063 // delta = PARENT_IJAVA_FRAME_ABI + (locals_count - params_count)
1064
1065 __ add2reg(sp_after_resize, (Interpreter::stackElementSize) - (frame::z_parent_ijava_frame_abi_size), Z_esp);
1066 if (!native_call) {
1067 __ z_sllg(Z_R0_scratch, local_count, LogBytesPerWord); // Params have already been subtracted from local_count.
1068 __ z_slgr(sp_after_resize, Z_R0_scratch);
1069 }
1070
1071 // top_frame_size = TOP_IJAVA_FRAME_ABI + max_stack + size of interpreter state
1072 __ add2reg(top_frame_size,
1073 frame::z_top_ijava_frame_abi_size +
1074 frame::z_ijava_state_size,
1075 max_stack);
1076
1077 if (!native_call) {
1078 // Stack overflow check.
1079 // Native calls don't need the stack size check since they have no
1080 // expression stack and the arguments are already on the stack and
1081 // we only add a handful of words to the stack.
1082 Register frame_size = max_stack; // Reuse the register for max_stack.
1083 __ z_lgr(frame_size, Z_SP);
1084 __ z_sgr(frame_size, sp_after_resize);
1085 __ z_agr(frame_size, top_frame_size);
1086 generate_stack_overflow_check(frame_size, fp/*tmp1*/);
1087 }
1088
1089 // asm_assert* is a nop in product builds
1090 NOT_PRODUCT(__ z_cg(Z_R14, _z_common_abi(return_pc), Z_SP));
1091 NOT_PRODUCT(__ asm_assert(Assembler::bcondEqual, "killed Z_R14", 0));
1092 __ resize_frame_absolute(sp_after_resize, fp, true);
1093 __ save_return_pc(Z_R14);
1094
1095 // ... and push the new frame F0.
1096 __ push_frame(top_frame_size, fp, true /*copy_sp*/, false);
1097 }
1098
1099 //=============================================================================
1100 // Initialize the new frame F0: initialize interpreter state.
1101
1102 {
1103 // locals
1104 const Register local_addr = Z_ARG4;
1105
1106 BLOCK_COMMENT("generate_fixed_frame: initialize interpreter state {");
1107
1108 #ifdef ASSERT
1109 // Set the magic number (using local_addr as tmp register).
1110 __ load_const_optimized(local_addr, frame::z_istate_magic_number);
1111 __ z_stg(local_addr, _z_ijava_state_neg(magic), fp);
1112 #endif
1113
1114 // Save sender SP from F1 (i.e. before it was potentially modified by an
1115 // adapter) into F0's interpreter state. We use it as well to revert
1116 // resizing the frame above.
1117 __ z_stg(Z_R10, _z_ijava_state_neg(sender_sp), fp);
1118
1119 // Load cp cache and save it at the end of this block.
1120 __ z_lg(Z_R1_scratch, Address(const_method, ConstMethod::constants_offset()));
1121 __ z_lg(Z_R1_scratch, Address(Z_R1_scratch, ConstantPool::cache_offset()));
1122
1123 // z_ijava_state->method = method;
1124 __ z_stg(Z_method, _z_ijava_state_neg(method), fp);
1125
1126 // Point locals at the first argument. Method's locals are the
1127 // parameters on top of caller's expression stack.
1128 // Tos points past last Java argument.
1129
1130 __ z_agr(Z_locals, Z_esp);
1131 // z_ijava_state->locals - i*BytesPerWord points to i-th Java local (i starts at 0)
1132 // z_ijava_state->locals = Z_esp + parameter_count bytes
1133 __ z_stg(Z_locals, _z_ijava_state_neg(locals), fp);
1134
1135 // z_ijava_state->oop_temp = nullptr;
1136 __ store_const(Address(fp, oop_tmp_offset), 0);
1137
1138 // Initialize z_ijava_state->mdx.
1139 Register Rmdp = Z_bcp;
1140 // native_call: assert that mdo is null
1141 const bool check_for_mdo = !native_call DEBUG_ONLY(|| native_call);
1142 if (ProfileInterpreter && check_for_mdo) {
1143 Label get_continue;
1144
1145 __ load_and_test_long(Rmdp, method_(method_data));
1146 __ z_brz(get_continue);
1147 DEBUG_ONLY(if (native_call) __ stop("native methods don't have a mdo"));
1148 __ add2reg(Rmdp, in_bytes(MethodData::data_offset()));
1149 __ bind(get_continue);
1150 }
1151 __ z_stg(Rmdp, _z_ijava_state_neg(mdx), fp);
1152
1153 // Initialize z_ijava_state->bcp and Z_bcp.
1154 if (native_call) {
1155 __ clear_reg(Z_bcp); // Must initialize. Will get written into frame where GC reads it.
1156 } else {
1157 __ add2reg(Z_bcp, in_bytes(ConstMethod::codes_offset()), const_method);
1158 }
1159 __ z_stg(Z_bcp, _z_ijava_state_neg(bcp), fp);
1160
1161 // no monitors and empty operand stack
1162 // => z_ijava_state->monitors points to the top slot in IJAVA_STATE.
1163 // => Z_ijava_state->esp points one slot above into the operand stack.
1164 // z_ijava_state->monitors = fp - frame::z_ijava_state_size - Interpreter::stackElementSize;
1165 // z_ijava_state->esp = Z_esp = z_ijava_state->monitors;
1166 __ add2reg(Z_esp, -frame::z_ijava_state_size, fp);
1167 __ z_stg(Z_esp, _z_ijava_state_neg(monitors), fp);
1168 __ add2reg(Z_esp, -Interpreter::stackElementSize);
1169 __ z_stg(Z_esp, _z_ijava_state_neg(esp), fp);
1170
1171 // z_ijava_state->cpoolCache = Z_R1_scratch (see load above);
1172 __ z_stg(Z_R1_scratch, _z_ijava_state_neg(cpoolCache), fp);
1173
1174 // Get mirror and store it in the frame as GC root for this Method*.
1175 __ load_mirror_from_const_method(Z_R1_scratch, const_method);
1176 __ z_stg(Z_R1_scratch, _z_ijava_state_neg(mirror), fp);
1177
1178 BLOCK_COMMENT("} generate_fixed_frame: initialize interpreter state");
1179
1180 //=============================================================================
1181 if (!native_call) {
1182 // Local_count is already num_locals_slots - num_param_slots.
1183 // Start of locals: local_addr = Z_locals - locals size + 1 slot
1184 __ z_llgh(Z_R0_scratch, Address(const_method, ConstMethod::size_of_locals_offset()));
1185 __ add2reg(local_addr, BytesPerWord, Z_locals);
1186 __ z_sllg(Z_R0_scratch, Z_R0_scratch, LogBytesPerWord);
1187 __ z_sgr(local_addr, Z_R0_scratch);
1188
1189 __ Clear_Array(local_count, local_addr, Z_ARG2);
1190 }
1191
1192 }
1193 // Finally set the frame pointer, destroying Z_method.
1194 assert(Z_fp == Z_method, "maybe set Z_fp earlier if other register than Z_method");
1195 // Oprofile analysis suggests to keep a copy in a register to be used by
1196 // generate_counter_incr().
1197 __ z_lgr(Z_ARG2, Z_method);
1198 __ z_lgr(Z_fp, fp);
1199
1200 BLOCK_COMMENT("} generate_fixed_frame");
1201 }
1202
1203 // Various method entries
1204
1205 // Math function, frame manager must set up an interpreter state, etc.
1206 address TemplateInterpreterGenerator::generate_math_entry(AbstractInterpreter::MethodKind kind) {
1207
1208 // Decide what to do: Use same platform specific instructions and runtime calls as compilers.
1209 bool use_instruction = false;
1210 address runtime_entry = nullptr;
1211 int num_args = 1;
1212 bool double_precision = true;
1213
1214 // s390 specific:
1215 switch (kind) {
1216 case Interpreter::java_lang_math_sqrt:
1217 case Interpreter::java_lang_math_abs: use_instruction = true; break;
1218 case Interpreter::java_lang_math_fmaF:
1219 case Interpreter::java_lang_math_fmaD: use_instruction = UseFMA; break;
1220 default: break; // Fall back to runtime call.
1221 }
1222
1223 switch (kind) {
1224 case Interpreter::java_lang_math_sin : runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dsin); break;
1225 case Interpreter::java_lang_math_cos : runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dcos); break;
1226 case Interpreter::java_lang_math_tan : runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dtan); break;
1227 case Interpreter::java_lang_math_tanh : /* run interpreted */ break;
1228 case Interpreter::java_lang_math_abs : /* run interpreted */ break;
1229 case Interpreter::java_lang_math_sqrt : /* runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dsqrt); not available */ break;
1230 case Interpreter::java_lang_math_log : runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dlog); break;
1231 case Interpreter::java_lang_math_log10: runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dlog10); break;
1232 case Interpreter::java_lang_math_pow : runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dpow); num_args = 2; break;
1233 case Interpreter::java_lang_math_exp : runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dexp); break;
1234 case Interpreter::java_lang_math_fmaF : /* run interpreted */ num_args = 3; double_precision = false; break;
1235 case Interpreter::java_lang_math_fmaD : /* run interpreted */ num_args = 3; break;
1236 default: ShouldNotReachHere();
1237 }
1238
1239 // Use normal entry if neither instruction nor runtime call is used.
1240 if (!use_instruction && runtime_entry == nullptr) return nullptr;
1241
1242 address entry = __ pc();
1243
1244 if (use_instruction) {
1245 switch (kind) {
1246 case Interpreter::java_lang_math_sqrt:
1247 // Can use memory operand directly.
1248 __ z_sqdb(Z_FRET, Interpreter::stackElementSize, Z_esp);
1249 break;
1250 case Interpreter::java_lang_math_abs:
1251 // Load operand from stack.
1252 __ mem2freg_opt(Z_FRET, Address(Z_esp, Interpreter::stackElementSize));
1253 __ z_lpdbr(Z_FRET);
1254 break;
1255 case Interpreter::java_lang_math_fmaF:
1256 __ mem2freg_opt(Z_FRET, Address(Z_esp, Interpreter::stackElementSize)); // result reg = arg3
1257 __ mem2freg_opt(Z_FARG2, Address(Z_esp, 3 * Interpreter::stackElementSize)); // arg1
1258 __ z_maeb(Z_FRET, Z_FARG2, Address(Z_esp, 2 * Interpreter::stackElementSize));
1259 break;
1260 case Interpreter::java_lang_math_fmaD:
1261 __ mem2freg_opt(Z_FRET, Address(Z_esp, Interpreter::stackElementSize)); // result reg = arg3
1262 __ mem2freg_opt(Z_FARG2, Address(Z_esp, 5 * Interpreter::stackElementSize)); // arg1
1263 __ z_madb(Z_FRET, Z_FARG2, Address(Z_esp, 3 * Interpreter::stackElementSize));
1264 break;
1265 default: ShouldNotReachHere();
1266 }
1267 } else {
1268 // Load arguments
1269 assert(num_args <= 4, "passed in registers");
1270 if (double_precision) {
1271 int offset = (2 * num_args - 1) * Interpreter::stackElementSize;
1272 for (int i = 0; i < num_args; ++i) {
1273 __ mem2freg_opt(as_FloatRegister(Z_FARG1->encoding() + 2 * i), Address(Z_esp, offset));
1274 offset -= 2 * Interpreter::stackElementSize;
1275 }
1276 } else {
1277 int offset = num_args * Interpreter::stackElementSize;
1278 for (int i = 0; i < num_args; ++i) {
1279 __ mem2freg_opt(as_FloatRegister(Z_FARG1->encoding() + 2 * i), Address(Z_esp, offset));
1280 offset -= Interpreter::stackElementSize;
1281 }
1282 }
1283 // Call runtime
1284 __ save_return_pc(); // Save Z_R14.
1285 __ push_frame_abi160(0); // Without new frame the RT call could overwrite the saved Z_R14.
1286
1287 __ call_VM_leaf(runtime_entry);
1288
1289 __ pop_frame();
1290 __ restore_return_pc(); // Restore Z_R14.
1291 }
1292
1293 // Pop c2i arguments (if any) off when we return.
1294 __ resize_frame_absolute(Z_R10, Z_R0, true); // Cut the stack back to where the caller started.
1295
1296 __ z_br(Z_R14);
1297
1298 return entry;
1299 }
1300
1301 // Interpreter stub for calling a native method. (asm interpreter).
1302 // This sets up a somewhat different looking stack for calling the
1303 // native method than the typical interpreter frame setup.
1304 address TemplateInterpreterGenerator::generate_native_entry(bool synchronized) {
1305 // Determine code generation flags.
1306 bool inc_counter = UseCompiler || CountCompiledCalls;
1307
1308 // Interpreter entry for ordinary Java methods.
1309 //
1310 // Registers alive
1311 // Z_SP - stack pointer
1312 // Z_thread - JavaThread*
1313 // Z_method - callee's method (method to be invoked)
1314 // Z_esp - operand (or expression) stack pointer of caller. one slot above last arg.
1315 // Z_R10 - sender sp (before modifications, e.g. by c2i adapter
1316 // and as well by generate_fixed_frame below)
1317 // Z_R14 - return address to caller (call_stub or c2i_adapter)
1318 //
1319 // Registers updated
1320 // Z_SP - stack pointer
1321 // Z_fp - callee's framepointer
1322 // Z_esp - callee's operand stack pointer
1323 // points to the slot above the value on top
1324 // Z_locals - used to access locals: locals[i] := *(Z_locals - i*BytesPerWord)
1325 // Z_tos - integer result, if any
1326 // z_ftos - floating point result, if any
1327 //
1328 // Stack layout at this point:
1329 //
1330 // F1 [TOP_IJAVA_FRAME_ABI] <-- Z_SP, Z_R10 (Z_R10 will be below Z_SP if
1331 // frame was extended by c2i adapter)
1332 // [outgoing Java arguments] <-- Z_esp
1333 // ...
1334 // PARENT [PARENT_IJAVA_FRAME_ABI]
1335 // ...
1336 //
1337
1338 address entry_point = __ pc();
1339
1340 // Make sure registers are different!
1341 assert_different_registers(Z_thread, Z_method, Z_esp);
1342
1343 BLOCK_COMMENT("native_entry {");
1344
1345 // Make sure method is native and not abstract.
1346 #ifdef ASSERT
1347 address reentry = nullptr;
1348 { Label L;
1349 __ testbit(method_(access_flags), JVM_ACC_NATIVE_BIT);
1350 __ z_btrue(L);
1351 reentry = __ stop_chain_static(reentry, "tried to execute non-native method as native");
1352 __ bind(L);
1353 }
1354 { Label L;
1355 __ testbit(method_(access_flags), JVM_ACC_ABSTRACT_BIT);
1356 __ z_bfalse(L);
1357 reentry = __ stop_chain_static(reentry, "tried to execute abstract method as non-abstract");
1358 __ bind(L);
1359 }
1360 #endif // ASSERT
1361
1362 // Save the return PC into the callers frame for assertion in generate_fixed_frame.
1363 NOT_PRODUCT(__ save_return_pc(Z_R14));
1364
1365 // Generate the code to allocate the interpreter stack frame.
1366 generate_fixed_frame(true);
1367
1368 const Address do_not_unlock_if_synchronized(Z_thread, JavaThread::do_not_unlock_if_synchronized_offset());
1369 // Since at this point in the method invocation the exception handler
1370 // would try to exit the monitor of synchronized methods which hasn't
1371 // been entered yet, we set the thread local variable
1372 // _do_not_unlock_if_synchronized to true. If any exception was thrown by
1373 // runtime, exception handling i.e. unlock_if_synchronized_method will
1374 // check this thread local flag.
1375 __ z_mvi(do_not_unlock_if_synchronized, true);
1376
1377 // Increment invocation count and check for overflow.
1378 NearLabel invocation_counter_overflow;
1379 if (inc_counter) {
1380 generate_counter_incr(&invocation_counter_overflow);
1381 }
1382
1383 Label continue_after_compile;
1384 __ bind(continue_after_compile);
1385
1386 bang_stack_shadow_pages(true);
1387
1388 // Reset the _do_not_unlock_if_synchronized flag.
1389 __ z_mvi(do_not_unlock_if_synchronized, false);
1390
1391 // Check for synchronized methods.
1392 // This mst happen AFTER invocation_counter check and stack overflow check,
1393 // so method is not locked if overflows.
1394 if (synchronized) {
1395 lock_method();
1396 } else {
1397 // No synchronization necessary.
1398 #ifdef ASSERT
1399 { Label L;
1400 __ get_method(Z_R1_scratch);
1401 __ testbit(method2_(Z_R1_scratch, access_flags), JVM_ACC_SYNCHRONIZED_BIT);
1402 __ z_bfalse(L);
1403 reentry = __ stop_chain_static(reentry, "method needs synchronization");
1404 __ bind(L);
1405 }
1406 #endif // ASSERT
1407 }
1408
1409 // start execution
1410
1411 // jvmti support
1412 __ notify_method_entry();
1413
1414 //=============================================================================
1415 // Get and call the signature handler.
1416 const Register Rmethod = Z_tmp_2;
1417 const Register signature_handler_entry = Z_tmp_1;
1418 const Register Rresult_handler = Z_tmp_3;
1419 Label call_signature_handler;
1420
1421 assert_different_registers(Z_fp, Rmethod, signature_handler_entry, Rresult_handler);
1422 assert(Rresult_handler->is_nonvolatile(), "Rresult_handler must be in a non-volatile register");
1423
1424 // Reload method.
1425 __ get_method(Rmethod);
1426
1427 // Check for signature handler.
1428 __ load_and_test_long(signature_handler_entry, method2_(Rmethod, signature_handler));
1429 __ z_brne(call_signature_handler);
1430
1431 // Method has never been called. Either generate a specialized
1432 // handler or point to the slow one.
1433 __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::prepare_native_call),
1434 Rmethod);
1435
1436 // Reload method.
1437 __ get_method(Rmethod);
1438
1439 // Reload signature handler, it must have been created/assigned in the meantime.
1440 __ z_lg(signature_handler_entry, method2_(Rmethod, signature_handler));
1441
1442 __ bind(call_signature_handler);
1443
1444 // We have a TOP_IJAVA_FRAME here, which belongs to us.
1445 __ set_top_ijava_frame_at_SP_as_last_Java_frame(Z_SP, Z_R1/*tmp*/);
1446
1447 // Call signature handler and pass locals address in Z_ARG1.
1448 __ z_lgr(Z_ARG1, Z_locals);
1449 __ call_stub(signature_handler_entry);
1450 // Save result handler returned by signature handler.
1451 __ z_lgr(Rresult_handler, Z_RET);
1452
1453 // Reload method (the slow signature handler may block for GC).
1454 __ get_method(Rmethod);
1455
1456 // Pass mirror handle if static call.
1457 {
1458 Label method_is_not_static;
1459 __ testbit(method2_(Rmethod, access_flags), JVM_ACC_STATIC_BIT);
1460 __ z_bfalse(method_is_not_static);
1461 // Load mirror from interpreter frame.
1462 __ z_lg(Z_R1, _z_ijava_state_neg(mirror), Z_fp);
1463 // z_ijava_state.oop_temp = pool_holder->klass_part()->java_mirror();
1464 __ z_stg(Z_R1, oop_tmp_offset, Z_fp);
1465 // Pass handle to mirror as 2nd argument to JNI method.
1466 __ add2reg(Z_ARG2, oop_tmp_offset, Z_fp);
1467 __ bind(method_is_not_static);
1468 }
1469
1470 // Pass JNIEnv address as first parameter.
1471 __ add2reg(Z_ARG1, in_bytes(JavaThread::jni_environment_offset()), Z_thread);
1472
1473 // Note: last java frame has been set above already. The pc from there
1474 // is precise enough.
1475
1476 // Get native function entry point before we change the thread state.
1477 __ z_lg(Z_R1/*native_method_entry*/, method2_(Rmethod, native_function));
1478
1479 //=============================================================================
1480 // Transition from _thread_in_Java to _thread_in_native. As soon as
1481 // we make this change the safepoint code needs to be certain that
1482 // the last Java frame we established is good. The pc in that frame
1483 // just need to be near here not an actual return address.
1484 #ifdef ASSERT
1485 {
1486 NearLabel L;
1487 __ mem2reg_opt(Z_R14, Address(Z_thread, JavaThread::thread_state_offset()), false /*32 bits*/);
1488 __ compareU32_and_branch(Z_R14, _thread_in_Java, Assembler::bcondEqual, L);
1489 reentry = __ stop_chain_static(reentry, "Wrong thread state in native stub");
1490 __ bind(L);
1491 }
1492 #endif
1493
1494 // Memory ordering: Z does not reorder store/load with subsequent load. That's strong enough.
1495 __ set_thread_state(_thread_in_native);
1496
1497 //=============================================================================
1498 // Call the native method. Argument registers must not have been
1499 // overwritten since "__ call_stub(signature_handler);" (except for
1500 // ARG1 and ARG2 for static methods).
1501
1502 __ call_c(Z_R1/*native_method_entry*/);
1503
1504 // NOTE: frame::interpreter_frame_result() depends on these stores.
1505 __ z_stg(Z_RET, _z_ijava_state_neg(lresult), Z_fp);
1506 __ freg2mem_opt(Z_FRET, Address(Z_fp, _z_ijava_state_neg(fresult)));
1507 const Register Rlresult = signature_handler_entry;
1508 assert(Rlresult->is_nonvolatile(), "Rlresult must be in a non-volatile register");
1509 __ z_lgr(Rlresult, Z_RET);
1510
1511 // Z_method may no longer be valid, because of GC.
1512
1513 // Block, if necessary, before resuming in _thread_in_Java state.
1514 // In order for GC to work, don't clear the last_Java_sp until after
1515 // blocking.
1516
1517 //=============================================================================
1518 // Switch thread to "native transition" state before reading the
1519 // synchronization state. This additional state is necessary
1520 // because reading and testing the synchronization state is not
1521 // atomic w.r.t. GC, as this scenario demonstrates: Java thread A,
1522 // in _thread_in_native state, loads _not_synchronized and is
1523 // preempted. VM thread changes sync state to synchronizing and
1524 // suspends threads for GC. Thread A is resumed to finish this
1525 // native method, but doesn't block here since it didn't see any
1526 // synchronization is progress, and escapes.
1527
1528 __ set_thread_state(_thread_in_native_trans);
1529 if (!UseSystemMemoryBarrier) {
1530 __ z_fence();
1531 }
1532
1533 // Now before we return to java we must look for a current safepoint
1534 // (a new safepoint can not start since we entered native_trans).
1535 // We must check here because a current safepoint could be modifying
1536 // the callers registers right this moment.
1537
1538 // Check for safepoint operation in progress and/or pending suspend requests.
1539 {
1540 Label Continue, do_safepoint;
1541 __ safepoint_poll(do_safepoint, Z_R1);
1542 // Check for suspend.
1543 __ load_and_test_int(Z_R0/*suspend_flags*/, thread_(suspend_flags));
1544 __ z_bre(Continue); // 0 -> no flag set -> not suspended
1545 __ bind(do_safepoint);
1546 __ z_lgr(Z_ARG1, Z_thread);
1547 __ call_c(CAST_FROM_FN_PTR(address, JavaThread::check_special_condition_for_native_trans));
1548 __ bind(Continue);
1549 }
1550
1551 //=============================================================================
1552 // Back in Interpreter Frame.
1553
1554 // We are in thread_in_native_trans here and back in the normal
1555 // interpreter frame. We don't have to do anything special about
1556 // safepoints and we can switch to Java mode anytime we are ready.
1557
1558 // Note: frame::interpreter_frame_result has a dependency on how the
1559 // method result is saved across the call to post_method_exit. For
1560 // native methods it assumes that the non-FPU/non-void result is
1561 // saved in z_ijava_state.lresult and a FPU result in z_ijava_state.fresult. If
1562 // this changes then the interpreter_frame_result implementation
1563 // will need to be updated too.
1564
1565 //=============================================================================
1566 // Back in Java.
1567
1568 // Memory ordering: Z does not reorder store/load with subsequent
1569 // load. That's strong enough.
1570 __ set_thread_state(_thread_in_Java);
1571
1572 __ reset_last_Java_frame();
1573
1574 // We reset the JNI handle block only after unboxing the result; see below.
1575
1576 // The method register is junk from after the thread_in_native transition
1577 // until here. Also can't call_VM until the bcp has been
1578 // restored. Need bcp for throwing exception below so get it now.
1579 __ get_method(Rmethod);
1580
1581 // Restore Z_bcp to have legal interpreter frame,
1582 // i.e., bci == 0 <=> Z_bcp == code_base().
1583 __ z_lg(Z_bcp, Address(Rmethod, Method::const_offset())); // get constMethod
1584 __ add2reg(Z_bcp, in_bytes(ConstMethod::codes_offset())); // get codebase
1585
1586 if (CheckJNICalls) {
1587 // clear_pending_jni_exception_check
1588 __ clear_mem(Address(Z_thread, JavaThread::pending_jni_exception_check_fn_offset()), sizeof(oop));
1589 }
1590
1591 // Check if the native method returns an oop, and if so, move it
1592 // from the jni handle to z_ijava_state.oop_temp. This is
1593 // necessary, because we reset the jni handle block below.
1594 // NOTE: frame::interpreter_frame_result() depends on this, too.
1595 { NearLabel no_oop_result;
1596 __ load_absolute_address(Z_R1, AbstractInterpreter::result_handler(T_OBJECT));
1597 __ compareU64_and_branch(Z_R1, Rresult_handler, Assembler::bcondNotEqual, no_oop_result);
1598 __ resolve_jobject(Rlresult, /* tmp1 */ Rmethod, /* tmp2 */ Z_R1);
1599 __ z_stg(Rlresult, oop_tmp_offset, Z_fp);
1600 __ bind(no_oop_result);
1601 }
1602
1603 // Reset handle block.
1604 __ z_lg(Z_R1/*active_handles*/, thread_(active_handles));
1605 __ clear_mem(Address(Z_R1, JNIHandleBlock::top_offset()), 4);
1606
1607 // Handle exceptions (exception handling will handle unlocking!).
1608 {
1609 Label L;
1610 __ load_and_test_long(Z_R0/*pending_exception*/, thread_(pending_exception));
1611 __ z_bre(L);
1612 __ MacroAssembler::call_VM(noreg,
1613 CAST_FROM_FN_PTR(address,
1614 InterpreterRuntime::throw_pending_exception));
1615 __ should_not_reach_here();
1616 __ bind(L);
1617 }
1618
1619 if (synchronized) {
1620 Register Rfirst_monitor = Z_ARG2;
1621 __ add2reg(Rfirst_monitor, -(frame::z_ijava_state_size + (int)sizeof(BasicObjectLock)), Z_fp);
1622 #ifdef ASSERT
1623 NearLabel ok;
1624 __ z_lg(Z_R1, _z_ijava_state_neg(monitors), Z_fp);
1625 __ compareU64_and_branch(Rfirst_monitor, Z_R1, Assembler::bcondEqual, ok);
1626 reentry = __ stop_chain_static(reentry, "native_entry:unlock: inconsistent z_ijava_state.monitors");
1627 __ bind(ok);
1628 #endif
1629 __ unlock_object(Rfirst_monitor);
1630 }
1631
1632 // JVMTI support. Result has already been saved above to the frame.
1633 __ notify_method_exit(true/*native_method*/, ilgl, InterpreterMacroAssembler::NotifyJVMTI);
1634
1635 // Move native method result back into proper registers and return.
1636 __ mem2freg_opt(Z_FRET, Address(Z_fp, _z_ijava_state_neg(fresult)));
1637 __ mem2reg_opt(Z_RET, Address(Z_fp, _z_ijava_state_neg(lresult)));
1638 __ call_stub(Rresult_handler);
1639
1640 // Pop the native method's interpreter frame.
1641 __ pop_interpreter_frame(Z_R14 /*return_pc*/, Z_ARG2/*tmp1*/, Z_ARG3/*tmp2*/);
1642
1643 // Return to caller.
1644 __ z_br(Z_R14);
1645
1646 if (inc_counter) {
1647 // Handle overflow of counter and compile method.
1648 __ bind(invocation_counter_overflow);
1649 generate_counter_overflow(continue_after_compile);
1650 }
1651
1652 BLOCK_COMMENT("} native_entry");
1653
1654 return entry_point;
1655 }
1656
1657 //
1658 // Generic interpreted method entry to template interpreter.
1659 //
1660 address TemplateInterpreterGenerator::generate_normal_entry(bool synchronized) {
1661 address entry_point = __ pc();
1662
1663 bool inc_counter = UseCompiler || CountCompiledCalls;
1664
1665 // Interpreter entry for ordinary Java methods.
1666 //
1667 // Registers alive
1668 // Z_SP - stack pointer
1669 // Z_thread - JavaThread*
1670 // Z_method - callee's method (method to be invoked)
1671 // Z_esp - operand (or expression) stack pointer of caller. one slot above last arg.
1672 // Z_R10 - sender sp (before modifications, e.g. by c2i adapter
1673 // and as well by generate_fixed_frame below)
1674 // Z_R14 - return address to caller (call_stub or c2i_adapter)
1675 //
1676 // Registers updated
1677 // Z_SP - stack pointer
1678 // Z_fp - callee's framepointer
1679 // Z_esp - callee's operand stack pointer
1680 // points to the slot above the value on top
1681 // Z_locals - used to access locals: locals[i] := *(Z_locals - i*BytesPerWord)
1682 // Z_tos - integer result, if any
1683 // z_ftos - floating point result, if any
1684 //
1685 //
1686 // stack layout at this point:
1687 //
1688 // F1 [TOP_IJAVA_FRAME_ABI] <-- Z_SP, Z_R10 (Z_R10 will be below Z_SP if
1689 // frame was extended by c2i adapter)
1690 // [outgoing Java arguments] <-- Z_esp
1691 // ...
1692 // PARENT [PARENT_IJAVA_FRAME_ABI]
1693 // ...
1694 //
1695 // stack layout before dispatching the first bytecode:
1696 //
1697 // F0 [TOP_IJAVA_FRAME_ABI] <-- Z_SP
1698 // [operand stack] <-- Z_esp
1699 // monitor (optional, can grow)
1700 // [IJAVA_STATE]
1701 // F1 [PARENT_IJAVA_FRAME_ABI] <-- Z_fp (== *Z_SP)
1702 // [F0's locals] <-- Z_locals
1703 // [F1's operand stack]
1704 // [F1's monitors] (optional)
1705 // [IJAVA_STATE]
1706
1707 // Make sure registers are different!
1708 assert_different_registers(Z_thread, Z_method, Z_esp);
1709
1710 BLOCK_COMMENT("normal_entry {");
1711
1712 // Make sure method is not native and not abstract.
1713 // Rethink these assertions - they can be simplified and shared.
1714 #ifdef ASSERT
1715 address reentry = nullptr;
1716 { Label L;
1717 __ testbit(method_(access_flags), JVM_ACC_NATIVE_BIT);
1718 __ z_bfalse(L);
1719 reentry = __ stop_chain_static(reentry, "tried to execute native method as non-native");
1720 __ bind(L);
1721 }
1722 { Label L;
1723 __ testbit(method_(access_flags), JVM_ACC_ABSTRACT_BIT);
1724 __ z_bfalse(L);
1725 reentry = __ stop_chain_static(reentry, "tried to execute abstract method as non-abstract");
1726 __ bind(L);
1727 }
1728 #endif // ASSERT
1729
1730 // Save the return PC into the callers frame for assertion in generate_fixed_frame.
1731 NOT_PRODUCT(__ save_return_pc(Z_R14));
1732
1733 // Generate the code to allocate the interpreter stack frame.
1734 generate_fixed_frame(false);
1735
1736 const Address do_not_unlock_if_synchronized(Z_thread, JavaThread::do_not_unlock_if_synchronized_offset());
1737 // Since at this point in the method invocation the exception handler
1738 // would try to exit the monitor of synchronized methods which hasn't
1739 // been entered yet, we set the thread local variable
1740 // _do_not_unlock_if_synchronized to true. If any exception was thrown by
1741 // runtime, exception handling i.e. unlock_if_synchronized_method will
1742 // check this thread local flag.
1743 __ z_mvi(do_not_unlock_if_synchronized, true);
1744
1745 __ profile_parameters_type(Z_tmp_2, Z_ARG3, Z_ARG4);
1746
1747 // Increment invocation counter and check for overflow.
1748 //
1749 // Note: checking for negative value instead of overflow so we have a 'sticky'
1750 // overflow test (may be of importance as soon as we have true MT/MP).
1751 NearLabel invocation_counter_overflow;
1752 NearLabel Lcontinue;
1753 if (inc_counter) {
1754 generate_counter_incr(&invocation_counter_overflow);
1755 }
1756 __ bind(Lcontinue);
1757
1758 bang_stack_shadow_pages(false);
1759
1760 // Reset the _do_not_unlock_if_synchronized flag.
1761 __ z_mvi(do_not_unlock_if_synchronized, false);
1762
1763 // Check for synchronized methods.
1764 // Must happen AFTER invocation_counter check and stack overflow check,
1765 // so method is not locked if overflows.
1766 if (synchronized) {
1767 // Allocate monitor and lock method.
1768 lock_method();
1769 } else {
1770 #ifdef ASSERT
1771 { Label L;
1772 __ get_method(Z_R1_scratch);
1773 __ testbit(method2_(Z_R1_scratch, access_flags), JVM_ACC_SYNCHRONIZED_BIT);
1774 __ z_bfalse(L);
1775 reentry = __ stop_chain_static(reentry, "method needs synchronization");
1776 __ bind(L);
1777 }
1778 #endif // ASSERT
1779 }
1780
1781 // start execution
1782
1783 #ifdef ASSERT
1784 __ verify_esp(Z_esp, Z_R1_scratch);
1785 #endif
1786
1787 // jvmti support
1788 __ notify_method_entry();
1789
1790 // Start executing instructions.
1791 __ dispatch_next(vtos);
1792 // Dispatch_next does not return.
1793 DEBUG_ONLY(__ should_not_reach_here());
1794
1795 // Invocation counter overflow.
1796 if (inc_counter) {
1797 // Handle invocation counter overflow.
1798 __ bind(invocation_counter_overflow);
1799 generate_counter_overflow(Lcontinue);
1800 }
1801
1802 BLOCK_COMMENT("} normal_entry");
1803
1804 return entry_point;
1805 }
1806
1807
1808 /**
1809 * Method entry for static native methods:
1810 * int java.util.zip.CRC32.update(int crc, int b)
1811 */
1812 address TemplateInterpreterGenerator::generate_CRC32_update_entry() {
1813 assert(UseCRC32Intrinsics, "this intrinsic is not supported");
1814 uint64_t entry_off = __ offset();
1815 Label slow_path;
1816
1817 // If we need a safepoint check, generate full interpreter entry.
1818 __ safepoint_poll(slow_path, Z_R1);
1819
1820 BLOCK_COMMENT("CRC32_update {");
1821
1822 // We don't generate local frame and don't align stack because
1823 // we not even call stub code (we generate the code inline)
1824 // and there is no safepoint on this path.
1825
1826 // Load java parameters.
1827 // Z_esp is callers operand stack pointer, i.e. it points to the parameters.
1828 const Register argP = Z_esp;
1829 const Register crc = Z_ARG1; // crc value
1830 const Register data = Z_ARG2; // address of java byte value (kernel_crc32 needs address)
1831 const Register dataLen = Z_ARG3; // source data len (1 byte). Not used because calling the single-byte emitter.
1832 const Register table = Z_ARG4; // address of crc32 table
1833
1834 // Arguments are reversed on java expression stack.
1835 __ z_la(data, 3+1*wordSize, argP); // byte value (stack address).
1836 // Being passed as an int, the single byte is at offset +3.
1837 __ z_llgf(crc, 2 * wordSize, argP); // Current crc state, zero extend to 64 bit to have a clean register.
1838
1839 StubRoutines::zarch::generate_load_crc_table_addr(_masm, table);
1840 __ kernel_crc32_singleByte(crc, data, dataLen, table, Z_R1, true);
1841
1842 // Restore caller sp for c2i case.
1843 __ resize_frame_absolute(Z_R10, Z_R0, true); // Cut the stack back to where the caller started.
1844
1845 __ z_br(Z_R14);
1846
1847 BLOCK_COMMENT("} CRC32_update");
1848
1849 // Use a previously generated vanilla native entry as the slow path.
1850 BIND(slow_path);
1851 __ jump_to_entry(Interpreter::entry_for_kind(Interpreter::native), Z_R1);
1852 return __ addr_at(entry_off);
1853 }
1854
1855
1856 /**
1857 * Method entry for static native methods:
1858 * int java.util.zip.CRC32.updateBytes( int crc, byte[] b, int off, int len)
1859 * int java.util.zip.CRC32.updateByteBuffer(int crc, long* buf, int off, int len)
1860 */
1861 address TemplateInterpreterGenerator::generate_CRC32_updateBytes_entry(AbstractInterpreter::MethodKind kind) {
1862 assert(UseCRC32Intrinsics, "this intrinsic is not supported");
1863 uint64_t entry_off = __ offset();
1864 Label slow_path;
1865
1866 // If we need a safepoint check, generate full interpreter entry.
1867 __ safepoint_poll(slow_path, Z_R1);
1868
1869 // We don't generate local frame and don't align stack because
1870 // we call stub code and there is no safepoint on this path.
1871
1872 // Load parameters.
1873 // Z_esp is callers operand stack pointer, i.e. it points to the parameters.
1874 const Register argP = Z_esp;
1875 const Register crc = Z_ARG1; // crc value
1876 const Register data = Z_ARG2; // address of java byte array
1877 const Register dataLen = Z_ARG3; // source data len
1878 const Register table = Z_ARG4; // address of crc32 table
1879 const Register t0 = Z_R10; // work reg for kernel* emitters
1880 const Register t1 = Z_R11; // work reg for kernel* emitters
1881 const Register t2 = Z_R12; // work reg for kernel* emitters
1882 const Register t3 = Z_R13; // work reg for kernel* emitters
1883
1884 // Arguments are reversed on java expression stack.
1885 // Calculate address of start element.
1886 if (kind == Interpreter::java_util_zip_CRC32_updateByteBuffer) { // Used for "updateByteBuffer direct".
1887 // crc @ (SP + 5W) (32bit)
1888 // buf @ (SP + 3W) (64bit ptr to long array)
1889 // off @ (SP + 2W) (32bit)
1890 // dataLen @ (SP + 1W) (32bit)
1891 // data = buf + off
1892 BLOCK_COMMENT("CRC32_updateByteBuffer {");
1893 __ z_llgf(crc, 5*wordSize, argP); // current crc state
1894 __ z_lg(data, 3*wordSize, argP); // start of byte buffer
1895 __ z_agf(data, 2*wordSize, argP); // Add byte buffer offset.
1896 __ z_lgf(dataLen, 1*wordSize, argP); // #bytes to process
1897 } else { // Used for "updateBytes update".
1898 // crc @ (SP + 4W) (32bit)
1899 // buf @ (SP + 3W) (64bit ptr to byte array)
1900 // off @ (SP + 2W) (32bit)
1901 // dataLen @ (SP + 1W) (32bit)
1902 // data = buf + off + base_offset
1903 BLOCK_COMMENT("CRC32_updateBytes {");
1904 __ z_llgf(crc, 4*wordSize, argP); // current crc state
1905 __ z_lg(data, 3*wordSize, argP); // start of byte buffer
1906 __ z_agf(data, 2*wordSize, argP); // Add byte buffer offset.
1907 __ z_lgf(dataLen, 1*wordSize, argP); // #bytes to process
1908 __ z_aghi(data, arrayOopDesc::base_offset_in_bytes(T_BYTE));
1909 }
1910
1911 StubRoutines::zarch::generate_load_crc_table_addr(_masm, table);
1912
1913 __ resize_frame(-(6*8), Z_R0, true); // Resize frame to provide add'l space to spill 5 registers.
1914 __ z_stmg(t0, t3, 1*8, Z_SP); // Spill regs 10..13 to make them available as work registers.
1915 __ kernel_crc32_1word(crc, data, dataLen, table, t0, t1, t2, t3, true);
1916 __ z_lmg(t0, t3, 1*8, Z_SP); // Spill regs 10..13 back from stack.
1917
1918 // Restore caller sp for c2i case.
1919 __ resize_frame_absolute(Z_R10, Z_R0, true); // Cut the stack back to where the caller started.
1920
1921 __ z_br(Z_R14);
1922
1923 BLOCK_COMMENT("} CRC32_update{Bytes|ByteBuffer}");
1924
1925 // Use a previously generated vanilla native entry as the slow path.
1926 BIND(slow_path);
1927 __ jump_to_entry(Interpreter::entry_for_kind(Interpreter::native), Z_R1);
1928 return __ addr_at(entry_off);
1929 }
1930
1931
1932 /**
1933 * Method entry for intrinsic-candidate (non-native) methods:
1934 * int java.util.zip.CRC32C.updateBytes( int crc, byte[] b, int off, int end)
1935 * int java.util.zip.CRC32C.updateDirectByteBuffer(int crc, long* buf, int off, int end)
1936 * Unlike CRC32, CRC32C does not have any methods marked as native
1937 * CRC32C also uses an "end" variable instead of the length variable CRC32 uses
1938 */
1939 address TemplateInterpreterGenerator::generate_CRC32C_updateBytes_entry(AbstractInterpreter::MethodKind kind) {
1940 assert(UseCRC32CIntrinsics, "this intrinsic is not supported");
1941 uint64_t entry_off = __ offset();
1942
1943 // We don't generate local frame and don't align stack because
1944 // we call stub code and there is no safepoint on this path.
1945
1946 // Load parameters.
1947 // Z_esp is callers operand stack pointer, i.e. it points to the parameters.
1948 const Register argP = Z_esp;
1949 const Register crc = Z_ARG1; // crc value
1950 const Register data = Z_ARG2; // address of java byte array
1951 const Register dataLen = Z_ARG3; // source data len
1952 const Register table = Z_ARG4; // address of crc32 table
1953 const Register t0 = Z_R10; // work reg for kernel* emitters
1954 const Register t1 = Z_R11; // work reg for kernel* emitters
1955 const Register t2 = Z_R12; // work reg for kernel* emitters
1956 const Register t3 = Z_R13; // work reg for kernel* emitters
1957
1958 // Arguments are reversed on java expression stack.
1959 // Calculate address of start element.
1960 if (kind == Interpreter::java_util_zip_CRC32C_updateDirectByteBuffer) { // Used for "updateByteBuffer direct".
1961 // crc @ (SP + 5W) (32bit)
1962 // buf @ (SP + 3W) (64bit ptr to long array)
1963 // off @ (SP + 2W) (32bit)
1964 // dataLen @ (SP + 1W) (32bit)
1965 // data = buf + off
1966 BLOCK_COMMENT("CRC32C_updateDirectByteBuffer {");
1967 __ z_llgf(crc, 5*wordSize, argP); // current crc state
1968 __ z_lg(data, 3*wordSize, argP); // start of byte buffer
1969 __ z_agf(data, 2*wordSize, argP); // Add byte buffer offset.
1970 __ z_lgf(dataLen, 1*wordSize, argP); // #bytes to process, calculated as
1971 __ z_sgf(dataLen, Address(argP, 2*wordSize)); // (end_index - offset)
1972 } else { // Used for "updateBytes update".
1973 // crc @ (SP + 4W) (32bit)
1974 // buf @ (SP + 3W) (64bit ptr to byte array)
1975 // off @ (SP + 2W) (32bit)
1976 // dataLen @ (SP + 1W) (32bit)
1977 // data = buf + off + base_offset
1978 BLOCK_COMMENT("CRC32C_updateBytes {");
1979 __ z_llgf(crc, 4*wordSize, argP); // current crc state
1980 __ z_lg(data, 3*wordSize, argP); // start of byte buffer
1981 __ z_agf(data, 2*wordSize, argP); // Add byte buffer offset.
1982 __ z_lgf(dataLen, 1*wordSize, argP); // #bytes to process, calculated as
1983 __ z_sgf(dataLen, Address(argP, 2*wordSize)); // (end_index - offset)
1984 __ z_aghi(data, arrayOopDesc::base_offset_in_bytes(T_BYTE));
1985 }
1986
1987 StubRoutines::zarch::generate_load_crc32c_table_addr(_masm, table);
1988
1989 __ resize_frame(-(6*8), Z_R0, true); // Resize frame to provide add'l space to spill 5 registers.
1990 __ z_stmg(t0, t3, 1*8, Z_SP); // Spill regs 10..13 to make them available as work registers.
1991 __ kernel_crc32_1word(crc, data, dataLen, table, t0, t1, t2, t3, false);
1992 __ z_lmg(t0, t3, 1*8, Z_SP); // Spill regs 10..13 back from stack.
1993
1994 // Restore caller sp for c2i case.
1995 __ resize_frame_absolute(Z_R10, Z_R0, true); // Cut the stack back to where the caller started.
1996
1997 __ z_br(Z_R14);
1998
1999 BLOCK_COMMENT("} CRC32C_update{Bytes|DirectByteBuffer}");
2000 return __ addr_at(entry_off);
2001 }
2002
2003 // Not supported
2004 address TemplateInterpreterGenerator::generate_currentThread() { return nullptr; }
2005 address TemplateInterpreterGenerator::generate_Float_intBitsToFloat_entry() { return nullptr; }
2006 address TemplateInterpreterGenerator::generate_Float_floatToRawIntBits_entry() { return nullptr; }
2007 address TemplateInterpreterGenerator::generate_Double_longBitsToDouble_entry() { return nullptr; }
2008 address TemplateInterpreterGenerator::generate_Double_doubleToRawLongBits_entry() { return nullptr; }
2009 address TemplateInterpreterGenerator::generate_Float_float16ToFloat_entry() { return nullptr; }
2010 address TemplateInterpreterGenerator::generate_Float_floatToFloat16_entry() { return nullptr; }
2011
2012 void TemplateInterpreterGenerator::bang_stack_shadow_pages(bool native_call) {
2013 // Quick & dirty stack overflow checking: bang the stack & handle trap.
2014 // Note that we do the banging after the frame is setup, since the exception
2015 // handling code expects to find a valid interpreter frame on the stack.
2016 // Doing the banging earlier fails if the caller frame is not an interpreter
2017 // frame.
2018 // (Also, the exception throwing code expects to unlock any synchronized
2019 // method receiver, so do the banging after locking the receiver.)
2020
2021 // Bang each page in the shadow zone. We can't assume it's been done for
2022 // an interpreter frame with greater than a page of locals, so each page
2023 // needs to be checked. Only true for non-native. For native, we only bang the last page.
2024 const size_t page_size = os::vm_page_size();
2025 const int n_shadow_pages = (int)(StackOverflow::stack_shadow_zone_size()/page_size);
2026 const int start_page_num = native_call ? n_shadow_pages : 1;
2027 for (int pages = start_page_num; pages <= n_shadow_pages; pages++) {
2028 __ bang_stack_with_offset(pages*page_size);
2029 }
2030 }
2031
2032 //-----------------------------------------------------------------------------
2033 // Exceptions
2034
2035 void TemplateInterpreterGenerator::generate_throw_exception() {
2036
2037 BLOCK_COMMENT("throw_exception {");
2038
2039 // Entry point in previous activation (i.e., if the caller was interpreted).
2040 Interpreter::_rethrow_exception_entry = __ pc();
2041 __ z_lg(Z_fp, _z_abi(callers_sp), Z_SP); // Frame accessors use Z_fp.
2042 // Z_ARG1 (==Z_tos): exception
2043 // Z_ARG2 : Return address/pc that threw exception.
2044 __ restore_bcp(); // R13 points to call/send.
2045 __ restore_locals();
2046
2047 // Fallthrough, no need to restore Z_esp.
2048
2049 // Entry point for exceptions thrown within interpreter code.
2050 Interpreter::_throw_exception_entry = __ pc();
2051 // Expression stack is undefined here.
2052 // Z_ARG1 (==Z_tos): exception
2053 // Z_bcp: exception bcp
2054 __ verify_oop(Z_ARG1);
2055 __ z_lgr(Z_ARG2, Z_ARG1);
2056
2057 // Expression stack must be empty before entering the VM in case of
2058 // an exception.
2059 __ empty_expression_stack();
2060 // Find exception handler address and preserve exception oop.
2061 const Register Rpreserved_exc_oop = Z_tmp_1;
2062 __ call_VM(Rpreserved_exc_oop,
2063 CAST_FROM_FN_PTR(address, InterpreterRuntime::exception_handler_for_exception),
2064 Z_ARG2);
2065 // Z_RET: exception handler entry point
2066 // Z_bcp: bcp for exception handler
2067 __ push_ptr(Rpreserved_exc_oop); // Push exception which is now the only value on the stack.
2068 __ z_br(Z_RET); // Jump to exception handler (may be _remove_activation_entry!).
2069
2070 // If the exception is not handled in the current frame the frame is
2071 // removed and the exception is rethrown (i.e. exception
2072 // continuation is _rethrow_exception).
2073 //
2074 // Note: At this point the bci is still the bci for the instruction
2075 // which caused the exception and the expression stack is
2076 // empty. Thus, for any VM calls at this point, GC will find a legal
2077 // oop map (with empty expression stack).
2078
2079 //
2080 // JVMTI PopFrame support
2081 //
2082
2083 Interpreter::_remove_activation_preserving_args_entry = __ pc();
2084 __ z_lg(Z_fp, _z_parent_ijava_frame_abi(callers_sp), Z_SP);
2085 __ empty_expression_stack();
2086 // Set the popframe_processing bit in pending_popframe_condition
2087 // indicating that we are currently handling popframe, so that
2088 // call_VMs that may happen later do not trigger new popframe
2089 // handling cycles.
2090 __ load_sized_value(Z_tmp_1, Address(Z_thread, JavaThread::popframe_condition_offset()), 4, false /*signed*/);
2091 __ z_oill(Z_tmp_1, JavaThread::popframe_processing_bit);
2092 __ z_sty(Z_tmp_1, thread_(popframe_condition));
2093
2094 {
2095 // Check to see whether we are returning to a deoptimized frame.
2096 // (The PopFrame call ensures that the caller of the popped frame is
2097 // either interpreted or compiled and deoptimizes it if compiled.)
2098 // In this case, we can't call dispatch_next() after the frame is
2099 // popped, but instead must save the incoming arguments and restore
2100 // them after deoptimization has occurred.
2101 //
2102 // Note that we don't compare the return PC against the
2103 // deoptimization blob's unpack entry because of the presence of
2104 // adapter frames in C2.
2105 NearLabel caller_not_deoptimized;
2106 __ z_lg(Z_ARG1, _z_parent_ijava_frame_abi(return_pc), Z_fp);
2107 __ call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::interpreter_contains), Z_ARG1);
2108 __ compareU64_and_branch(Z_RET, (intptr_t)0, Assembler::bcondNotEqual, caller_not_deoptimized);
2109
2110 // Compute size of arguments for saving when returning to
2111 // deoptimized caller.
2112 __ get_method(Z_ARG2);
2113 __ z_lg(Z_ARG2, Address(Z_ARG2, Method::const_offset()));
2114 __ z_llgh(Z_ARG2, Address(Z_ARG2, ConstMethod::size_of_parameters_offset()));
2115 __ z_sllg(Z_ARG2, Z_ARG2, Interpreter::logStackElementSize); // slots 2 bytes
2116 __ restore_locals();
2117 // Compute address of args to be saved.
2118 __ z_lgr(Z_ARG3, Z_locals);
2119 __ z_slgr(Z_ARG3, Z_ARG2);
2120 __ add2reg(Z_ARG3, wordSize);
2121 // Save these arguments.
2122 __ call_VM_leaf(CAST_FROM_FN_PTR(address, Deoptimization::popframe_preserve_args),
2123 Z_thread, Z_ARG2, Z_ARG3);
2124
2125 __ remove_activation(vtos, Z_R14,
2126 /* throw_monitor_exception */ false,
2127 /* install_monitor_exception */ false,
2128 /* notify_jvmdi */ false);
2129
2130 // Inform deoptimization that it is responsible for restoring
2131 // these arguments.
2132 __ store_const(thread_(popframe_condition),
2133 JavaThread::popframe_force_deopt_reexecution_bit,
2134 Z_tmp_1, false);
2135
2136 // Continue in deoptimization handler.
2137 __ z_br(Z_R14);
2138
2139 __ bind(caller_not_deoptimized);
2140 }
2141
2142 // Clear the popframe condition flag.
2143 __ clear_mem(thread_(popframe_condition), sizeof(int));
2144
2145 __ remove_activation(vtos,
2146 noreg, // Retaddr is not used.
2147 false, // throw_monitor_exception
2148 false, // install_monitor_exception
2149 false); // notify_jvmdi
2150 __ z_lg(Z_fp, _z_abi(callers_sp), Z_SP); // Restore frame pointer.
2151 __ restore_bcp();
2152 __ restore_locals();
2153 __ restore_esp();
2154 // The method data pointer was incremented already during
2155 // call profiling. We have to restore the mdp for the current bcp.
2156 if (ProfileInterpreter) {
2157 __ set_method_data_pointer_for_bcp();
2158 }
2159 #if INCLUDE_JVMTI
2160 {
2161 Label L_done;
2162
2163 __ z_cli(0, Z_bcp, Bytecodes::_invokestatic);
2164 __ z_brc(Assembler::bcondNotEqual, L_done);
2165
2166 // The member name argument must be restored if _invokestatic is
2167 // re-executed after a PopFrame call. Detect such a case in the
2168 // InterpreterRuntime function and return the member name
2169 // argument, or null.
2170 __ z_lg(Z_ARG2, Address(Z_locals));
2171 __ get_method(Z_ARG3);
2172 __ call_VM(Z_tmp_1,
2173 CAST_FROM_FN_PTR(address, InterpreterRuntime::member_name_arg_or_null),
2174 Z_ARG2, Z_ARG3, Z_bcp);
2175
2176 __ z_ltgr(Z_tmp_1, Z_tmp_1);
2177 __ z_brc(Assembler::bcondEqual, L_done);
2178
2179 __ z_stg(Z_tmp_1, Address(Z_esp, wordSize));
2180 __ bind(L_done);
2181 }
2182 #endif // INCLUDE_JVMTI
2183 __ dispatch_next(vtos);
2184 // End of PopFrame support.
2185 Interpreter::_remove_activation_entry = __ pc();
2186
2187 // In between activations - previous activation type unknown yet
2188 // compute continuation point - the continuation point expects the
2189 // following registers set up:
2190 //
2191 // Z_ARG1 (==Z_tos): exception
2192 // Z_ARG2 : return address/pc that threw exception
2193
2194 Register return_pc = Z_tmp_1;
2195 Register handler = Z_tmp_2;
2196 assert(return_pc->is_nonvolatile(), "use non-volatile reg. to preserve exception pc");
2197 assert(handler->is_nonvolatile(), "use non-volatile reg. to handler pc");
2198 __ asm_assert_ijava_state_magic(return_pc/*tmp*/); // The top frame should be an interpreter frame.
2199 __ z_lg(return_pc, _z_parent_ijava_frame_abi(return_pc), Z_fp);
2200
2201 // Moved removing the activation after VM call, because the new top
2202 // frame does not necessarily have the z_abi_160 required for a VM
2203 // call (e.g. if it is compiled).
2204
2205 __ super_call_VM_leaf(CAST_FROM_FN_PTR(address,
2206 SharedRuntime::exception_handler_for_return_address),
2207 Z_thread, return_pc);
2208 __ z_lgr(handler, Z_RET); // Save exception handler.
2209
2210 // Preserve exception over this code sequence.
2211 __ pop_ptr(Z_ARG1);
2212 __ set_vm_result(Z_ARG1);
2213 // Remove the activation (without doing throws on illegalMonitorExceptions).
2214 __ remove_activation(vtos, noreg/*ret.pc already loaded*/, false/*throw exc*/, true/*install exc*/, false/*notify jvmti*/);
2215 __ z_lg(Z_fp, _z_abi(callers_sp), Z_SP); // Restore frame pointer.
2216
2217 __ get_vm_result(Z_ARG1); // Restore exception.
2218 __ verify_oop(Z_ARG1);
2219 __ z_lgr(Z_ARG2, return_pc); // Restore return address.
2220
2221 #ifdef ASSERT
2222 // The return_pc in the new top frame is dead... at least that's my
2223 // current understanding. To assert this I overwrite it.
2224 // Note: for compiled frames the handler is the deopt blob
2225 // which writes Z_ARG2 into the return_pc slot.
2226 __ load_const_optimized(return_pc, 0xb00b1);
2227 __ z_stg(return_pc, _z_parent_ijava_frame_abi(return_pc), Z_SP);
2228 #endif
2229
2230 // Z_ARG1 (==Z_tos): exception
2231 // Z_ARG2 : return address/pc that threw exception
2232
2233 // Note that an "issuing PC" is actually the next PC after the call.
2234 __ z_br(handler); // Jump to exception handler of caller.
2235
2236 BLOCK_COMMENT("} throw_exception");
2237 }
2238
2239 //
2240 // JVMTI ForceEarlyReturn support
2241 //
2242 address TemplateInterpreterGenerator::generate_earlyret_entry_for (TosState state) {
2243 address entry = __ pc();
2244
2245 BLOCK_COMMENT("earlyret_entry {");
2246
2247 __ z_lg(Z_fp, _z_parent_ijava_frame_abi(callers_sp), Z_SP);
2248 __ restore_bcp();
2249 __ restore_locals();
2250 __ restore_esp();
2251 __ empty_expression_stack();
2252 __ load_earlyret_value(state);
2253
2254 Register RjvmtiState = Z_tmp_1;
2255 __ z_lg(RjvmtiState, thread_(jvmti_thread_state));
2256 __ store_const(Address(RjvmtiState, JvmtiThreadState::earlyret_state_offset()),
2257 JvmtiThreadState::earlyret_inactive, 4, 4, Z_R0_scratch);
2258
2259 if (state == itos) {
2260 // Narrow result if state is itos but result type is smaller.
2261 // Need to narrow in the return bytecode rather than in generate_return_entry
2262 // since compiled code callers expect the result to already be narrowed.
2263 __ narrow(Z_tos, Z_tmp_1); /* fall through */
2264 }
2265 __ remove_activation(state,
2266 Z_tmp_1, // retaddr
2267 false, // throw_monitor_exception
2268 false, // install_monitor_exception
2269 true); // notify_jvmdi
2270 __ z_br(Z_tmp_1);
2271
2272 BLOCK_COMMENT("} earlyret_entry");
2273
2274 return entry;
2275 }
2276
2277 //-----------------------------------------------------------------------------
2278 // Helper for vtos entry point generation.
2279
2280 void TemplateInterpreterGenerator::set_vtos_entry_points(Template* t,
2281 address& bep,
2282 address& cep,
2283 address& sep,
2284 address& aep,
2285 address& iep,
2286 address& lep,
2287 address& fep,
2288 address& dep,
2289 address& vep) {
2290 assert(t->is_valid() && t->tos_in() == vtos, "illegal template");
2291 Label L;
2292 aep = __ pc(); __ push_ptr(); __ z_bru(L);
2293 fep = __ pc(); __ push_f(); __ z_bru(L);
2294 dep = __ pc(); __ push_d(); __ z_bru(L);
2295 lep = __ pc(); __ push_l(); __ z_bru(L);
2296 bep = cep = sep =
2297 iep = __ pc(); __ push_i();
2298 vep = __ pc();
2299 __ bind(L);
2300 generate_and_dispatch(t);
2301 }
2302
2303 //-----------------------------------------------------------------------------
2304
2305 #ifndef PRODUCT
2306 address TemplateInterpreterGenerator::generate_trace_code(TosState state) {
2307 address entry = __ pc();
2308 NearLabel counter_below_trace_threshold;
2309
2310 if (TraceBytecodesAt > 0) {
2311 // Skip runtime call, if the trace threshold is not yet reached.
2312 __ load_absolute_address(Z_tmp_1, (address)&BytecodeCounter::_counter_value);
2313 __ load_absolute_address(Z_tmp_2, (address)&TraceBytecodesAt);
2314 __ load_sized_value(Z_tmp_1, Address(Z_tmp_1), 4, false /*signed*/);
2315 __ load_sized_value(Z_tmp_2, Address(Z_tmp_2), 8, false /*signed*/);
2316 __ compareU64_and_branch(Z_tmp_1, Z_tmp_2, Assembler::bcondLow, counter_below_trace_threshold);
2317 }
2318
2319 int offset2 = state == ltos || state == dtos ? 2 : 1;
2320
2321 __ push(state);
2322 // Preserved return pointer is in Z_R14.
2323 // InterpreterRuntime::trace_bytecode() preserved and returns the value passed as second argument.
2324 __ z_lgr(Z_ARG2, Z_R14);
2325 __ z_lg(Z_ARG3, Address(Z_esp, Interpreter::expr_offset_in_bytes(0)));
2326 if (WizardMode) {
2327 __ z_lgr(Z_ARG4, Z_esp); // Trace Z_esp in WizardMode.
2328 } else {
2329 __ z_lg(Z_ARG4, Address(Z_esp, Interpreter::expr_offset_in_bytes(offset2)));
2330 }
2331 __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::trace_bytecode), Z_ARG2, Z_ARG3, Z_ARG4);
2332 __ z_lgr(Z_R14, Z_RET); // Estore return address (see above).
2333 __ pop(state);
2334
2335 __ bind(counter_below_trace_threshold);
2336 __ z_br(Z_R14); // return
2337
2338 return entry;
2339 }
2340
2341 // Make feasible for old CPUs.
2342 void TemplateInterpreterGenerator::count_bytecode() {
2343 __ load_absolute_address(Z_R1_scratch, (address) &BytecodeCounter::_counter_value);
2344 __ add2mem_32(Address(Z_R1_scratch), 1, Z_R0_scratch);
2345 }
2346
2347 void TemplateInterpreterGenerator::histogram_bytecode(Template * t) {
2348 __ load_absolute_address(Z_R1_scratch, (address)&BytecodeHistogram::_counters[ t->bytecode() ]);
2349 __ add2mem_32(Address(Z_R1_scratch), 1, Z_tmp_1);
2350 }
2351
2352 void TemplateInterpreterGenerator::histogram_bytecode_pair(Template * t) {
2353 Address index_addr(Z_tmp_1, (intptr_t) 0);
2354 Register index = Z_tmp_2;
2355
2356 // Load previous index.
2357 __ load_absolute_address(Z_tmp_1, (address) &BytecodePairHistogram::_index);
2358 __ mem2reg_opt(index, index_addr, false);
2359
2360 // Mask with current bytecode and store as new previous index.
2361 __ z_srl(index, BytecodePairHistogram::log2_number_of_codes);
2362 __ load_const_optimized(Z_R0_scratch,
2363 (int)t->bytecode() << BytecodePairHistogram::log2_number_of_codes);
2364 __ z_or(index, Z_R0_scratch);
2365 __ reg2mem_opt(index, index_addr, false);
2366
2367 // Load counter array's address.
2368 __ z_lgfr(index, index); // Sign extend for addressing.
2369 __ z_sllg(index, index, LogBytesPerInt); // index2bytes
2370 __ load_absolute_address(Z_R1_scratch,
2371 (address) &BytecodePairHistogram::_counters);
2372 // Add index and increment counter.
2373 __ z_agr(Z_R1_scratch, index);
2374 __ add2mem_32(Address(Z_R1_scratch), 1, Z_tmp_1);
2375 }
2376
2377 void TemplateInterpreterGenerator::trace_bytecode(Template* t) {
2378 // Call a little run-time stub to avoid blow-up for each bytecode.
2379 // The run-time runtime saves the right registers, depending on
2380 // the tosca in-state for the given template.
2381 address entry = Interpreter::trace_code(t->tos_in());
2382 guarantee(entry != nullptr, "entry must have been generated");
2383 __ call_stub(entry);
2384 }
2385
2386 void TemplateInterpreterGenerator::stop_interpreter_at() {
2387 NearLabel L;
2388
2389 __ load_absolute_address(Z_tmp_1, (address)&BytecodeCounter::_counter_value);
2390 __ load_absolute_address(Z_tmp_2, (address)&StopInterpreterAt);
2391 __ load_sized_value(Z_tmp_1, Address(Z_tmp_1), 4, false /*signed*/);
2392 __ load_sized_value(Z_tmp_2, Address(Z_tmp_2), 8, false /*signed*/);
2393 __ compareU64_and_branch(Z_tmp_1, Z_tmp_2, Assembler::bcondLow, L);
2394 assert(Z_tmp_1->is_nonvolatile(), "must be nonvolatile to preserve Z_tos");
2395 assert(Z_F8->is_nonvolatile(), "must be nonvolatile to preserve Z_ftos");
2396 __ z_lgr(Z_tmp_1, Z_tos); // Save tos.
2397 __ z_lgr(Z_tmp_2, Z_bytecode); // Save Z_bytecode.
2398 __ z_ldr(Z_F8, Z_ftos); // Save ftos.
2399 // Use -XX:StopInterpreterAt=<num> to set the limit
2400 // and break at breakpoint().
2401 __ call_VM(noreg, CAST_FROM_FN_PTR(address, breakpoint), false);
2402 __ z_lgr(Z_tos, Z_tmp_1); // Restore tos.
2403 __ z_lgr(Z_bytecode, Z_tmp_2); // Save Z_bytecode.
2404 __ z_ldr(Z_ftos, Z_F8); // Restore ftos.
2405 __ bind(L);
2406 }
2407
2408 #endif // !PRODUCT