1 /*
2 * Copyright (c) 2016, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2016 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 "interpreter/abstractInterpreter.hpp"
29 #include "interpreter/bytecodeHistogram.hpp"
30 #include "interpreter/interpreter.hpp"
31 #include "interpreter/interpreterRuntime.hpp"
32 #include "interpreter/interp_masm.hpp"
33 #include "interpreter/templateInterpreterGenerator.hpp"
34 #include "interpreter/templateTable.hpp"
35 #include "oops/arrayOop.hpp"
36 #include "oops/oop.inline.hpp"
37 #include "prims/jvmtiExport.hpp"
38 #include "prims/jvmtiThreadState.hpp"
39 #include "runtime/arguments.hpp"
40 #include "runtime/deoptimization.hpp"
41 #include "runtime/frame.inline.hpp"
42 #include "runtime/sharedRuntime.hpp"
43 #include "runtime/stubRoutines.hpp"
44 #include "runtime/synchronizer.hpp"
45 #include "runtime/timer.hpp"
46 #include "runtime/vframeArray.hpp"
47 #include "utilities/debug.hpp"
48
49
50 // Size of interpreter code. Increase if too small. Interpreter will
51 // fail with a guarantee ("not enough space for interpreter generation");
52 // if too small.
53 // Run with +PrintInterpreter to get the VM to print out the size.
54 // Max size with JVMTI
55 int TemplateInterpreter::InterpreterCodeSize = 320*K;
56
57 #undef __
58 #ifdef PRODUCT
59 #define __ _masm->
60 #else
61 #define __ _masm->
62 // #define __ (Verbose ? (_masm->block_comment(FILE_AND_LINE),_masm):_masm)->
63 #endif
64
65 #define BLOCK_COMMENT(str) __ block_comment(str)
66 #define BIND(label) __ bind(label); BLOCK_COMMENT(#label ":")
67
68 #define oop_tmp_offset _z_ijava_state_neg(oop_tmp)
69
70 //-----------------------------------------------------------------------------
71
72 address TemplateInterpreterGenerator::generate_slow_signature_handler() {
73 //
74 // New slow_signature handler that respects the z/Architecture
75 // C calling conventions.
76 //
77 // We get called by the native entry code with our output register
78 // area == 8. First we call InterpreterRuntime::get_result_handler
79 // to copy the pointer to the signature string temporarily to the
80 // first C-argument and to return the result_handler in
81 // Z_RET. Since native_entry will copy the jni-pointer to the
82 // first C-argument slot later on, it's OK to occupy this slot
83 // temporarily. Then we copy the argument list on the java
84 // expression stack into native varargs format on the native stack
85 // and load arguments into argument registers. Integer arguments in
86 // the varargs vector will be sign-extended to 8 bytes.
87 //
88 // On entry:
89 // Z_ARG1 - intptr_t* Address of java argument list in memory.
90 // Z_state - cppInterpreter* Address of interpreter state for
91 // this method
92 // Z_method
93 //
94 // On exit (just before return instruction):
95 // Z_RET contains the address of the result_handler.
96 // Z_ARG2 is not updated for static methods and contains "this" otherwise.
97 // Z_ARG3-Z_ARG5 contain the first 3 arguments of types other than float and double.
98 // Z_FARG1-Z_FARG4 contain the first 4 arguments of type float or double.
99
100 const int LogSizeOfCase = 3;
101
102 const int max_fp_register_arguments = Argument::n_float_register_parameters;
103 const int max_int_register_arguments = Argument::n_register_parameters - 2; // First 2 are reserved.
104
105 const Register arg_java = Z_tmp_2;
106 const Register arg_c = Z_tmp_3;
107 const Register signature = Z_R1_scratch; // Is a string.
108 const Register fpcnt = Z_R0_scratch;
109 const Register argcnt = Z_tmp_4;
110 const Register intSlot = Z_tmp_1;
111 const Register sig_end = Z_tmp_1; // Assumed end of signature (only used in do_object).
112 const Register target_sp = Z_tmp_1;
113 const FloatRegister floatSlot = Z_F1;
114
115 const int d_signature = _z_abi(gpr6); // Only spill space, register contents not affected.
116 const int d_fpcnt = _z_abi(gpr7); // Only spill space, register contents not affected.
117
118 unsigned int entry_offset = __ offset();
119
120 BLOCK_COMMENT("slow_signature_handler {");
121
122 // We use target_sp for storing arguments in the C frame.
123 __ save_return_pc();
124
125 __ z_stmg(Z_R10,Z_R13,-32,Z_SP);
126 __ push_frame_abi160(32);
127
128 __ z_lgr(arg_java, Z_ARG1);
129
130 Register method = Z_ARG2; // Directly load into correct argument register.
131
132 __ get_method(method);
133 __ call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::get_signature), Z_thread, method);
134
135 // Move signature to callee saved register.
136 // Don't directly write to stack. Frame is used by VM call.
137 __ z_lgr(Z_tmp_1, Z_RET);
138
139 // Reload method. Register may have been altered by VM call.
140 __ get_method(method);
141
142 // Get address of result handler.
143 __ call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::get_result_handler), Z_thread, method);
144
145 // Save signature address to stack.
146 __ z_stg(Z_tmp_1, d_signature, Z_SP);
147
148 // Don't overwrite return value (Z_RET, Z_ARG1) in rest of the method !
149
150 {
151 Label isStatic;
152
153 // Test if static.
154 // We can test the bit directly.
155 // Path is Z_method->_access_flags._flags.
156 // We only support flag bits in the least significant byte (assert !).
157 // Therefore add 3 to address that byte within "_flags".
158 // Reload method. VM call above may have destroyed register contents
159 __ get_method(method);
160 __ testbit(method2_(method, access_flags), JVM_ACC_STATIC_BIT);
161 method = noreg; // end of life
162 __ z_btrue(isStatic);
163
164 // For non-static functions, pass "this" in Z_ARG2 and copy it to 2nd C-arg slot.
165 // Need to box the Java object here, so we use arg_java
166 // (address of current Java stack slot) as argument and
167 // don't dereference it as in case of ints, floats, etc..
168 __ z_lgr(Z_ARG2, arg_java);
169 __ add2reg(arg_java, -BytesPerWord);
170 __ bind(isStatic);
171 }
172
173 // argcnt == 0 corresponds to 3rd C argument.
174 // arg #1 (result handler) and
175 // arg #2 (this, for non-statics), unused else
176 // are reserved and pre-filled above.
177 // arg_java points to the corresponding Java argument here. It
178 // has been decremented by one argument (this) in case of non-static.
179 __ clear_reg(argcnt, true, false); // Don't set CC.
180 __ z_lg(target_sp, 0, Z_SP);
181 __ add2reg(arg_c, _z_abi(remaining_cargs), target_sp);
182 // No floating-point args parsed so far.
183 __ clear_mem(Address(Z_SP, d_fpcnt), 8);
184
185 NearLabel move_intSlot_to_ARG, move_floatSlot_to_FARG;
186 NearLabel loop_start, loop_start_restore, loop_end;
187 NearLabel do_int, do_long, do_float, do_double;
188 NearLabel do_dontreachhere, do_object, do_array, do_boxed;
189
190 #ifdef ASSERT
191 // Signature needs to point to '(' (== 0x28) at entry.
192 __ z_lg(signature, d_signature, Z_SP);
193 __ z_cli(0, signature, (int) '(');
194 __ z_brne(do_dontreachhere);
195 #endif
196
197 __ bind(loop_start_restore);
198 __ z_lg(signature, d_signature, Z_SP); // Restore signature ptr, destroyed by move_XX_to_ARG.
199
200 BIND(loop_start);
201 // Advance to next argument type token from the signature.
202 __ add2reg(signature, 1);
203
204 // Use CLI, works well on all CPU versions.
205 __ z_cli(0, signature, (int) ')');
206 __ z_bre(loop_end); // end of signature
207 __ z_cli(0, signature, (int) 'L');
208 __ z_bre(do_object); // object #9
209 __ z_cli(0, signature, (int) 'F');
210 __ z_bre(do_float); // float #7
211 __ z_cli(0, signature, (int) 'J');
212 __ z_bre(do_long); // long #6
213 __ z_cli(0, signature, (int) 'B');
214 __ z_bre(do_int); // byte #1
215 __ z_cli(0, signature, (int) 'Z');
216 __ z_bre(do_int); // boolean #2
217 __ z_cli(0, signature, (int) 'C');
218 __ z_bre(do_int); // char #3
219 __ z_cli(0, signature, (int) 'S');
220 __ z_bre(do_int); // short #4
221 __ z_cli(0, signature, (int) 'I');
222 __ z_bre(do_int); // int #5
223 __ z_cli(0, signature, (int) 'D');
224 __ z_bre(do_double); // double #8
225 __ z_cli(0, signature, (int) '[');
226 __ z_bre(do_array); // array #10
227
228 __ bind(do_dontreachhere);
229
230 __ unimplemented("ShouldNotReachHere in slow_signature_handler", 120);
231
232 // Array argument
233 BIND(do_array);
234
235 {
236 Label start_skip, end_skip;
237
238 __ bind(start_skip);
239
240 // Advance to next type tag from signature.
241 __ add2reg(signature, 1);
242
243 // Use CLI, works well on all CPU versions.
244 __ z_cli(0, signature, (int) '[');
245 __ z_bre(start_skip); // Skip further brackets.
246
247 __ z_cli(0, signature, (int) '9');
248 __ z_brh(end_skip); // no optional size
249
250 __ z_cli(0, signature, (int) '0');
251 __ z_brnl(start_skip); // Skip optional size.
252
253 __ bind(end_skip);
254
255 __ z_cli(0, signature, (int) 'L');
256 __ z_brne(do_boxed); // If not array of objects: go directly to do_boxed.
257 }
258
259 // OOP argument
260 BIND(do_object);
261 // Pass by an object's type name.
262 {
263 Label L;
264
265 __ add2reg(sig_end, 4095, signature); // Assume object type name is shorter than 4k.
266 __ load_const_optimized(Z_R0, (int) ';'); // Type name terminator (must be in Z_R0!).
267 __ MacroAssembler::search_string(sig_end, signature);
268 __ z_brl(L);
269 __ z_illtrap(); // No semicolon found: internal error or object name too long.
270 __ bind(L);
271 __ z_lgr(signature, sig_end);
272 // fallthru to do_boxed
273 }
274
275 // Need to box the Java object here, so we use arg_java
276 // (address of current Java stack slot) as argument and
277 // don't dereference it as in case of ints, floats, etc..
278
279 // UNBOX argument
280 // Load reference and check for NULL.
281 Label do_int_Entry4Boxed;
282 __ bind(do_boxed);
283 {
284 __ load_and_test_long(intSlot, Address(arg_java));
285 __ z_bre(do_int_Entry4Boxed);
286 __ z_lgr(intSlot, arg_java);
287 __ z_bru(do_int_Entry4Boxed);
288 }
289
290 // INT argument
291
292 // (also for byte, boolean, char, short)
293 // Use lgf for load (sign-extend) and stg for store.
294 BIND(do_int);
295 __ z_lgf(intSlot, 0, arg_java);
296
297 __ bind(do_int_Entry4Boxed);
298 __ add2reg(arg_java, -BytesPerWord);
299 // If argument fits into argument register, go and handle it, otherwise continue.
300 __ compare32_and_branch(argcnt, max_int_register_arguments,
301 Assembler::bcondLow, move_intSlot_to_ARG);
302 __ z_stg(intSlot, 0, arg_c);
303 __ add2reg(arg_c, BytesPerWord);
304 __ z_bru(loop_start);
305
306 // LONG argument
307
308 BIND(do_long);
309 __ add2reg(arg_java, -2*BytesPerWord); // Decrement first to have positive displacement for lg.
310 __ z_lg(intSlot, BytesPerWord, arg_java);
311 // If argument fits into argument register, go and handle it, otherwise continue.
312 __ compare32_and_branch(argcnt, max_int_register_arguments,
313 Assembler::bcondLow, move_intSlot_to_ARG);
314 __ z_stg(intSlot, 0, arg_c);
315 __ add2reg(arg_c, BytesPerWord);
316 __ z_bru(loop_start);
317
318 // FLOAT argumen
319
320 BIND(do_float);
321 __ z_le(floatSlot, 0, arg_java);
322 __ add2reg(arg_java, -BytesPerWord);
323 assert(max_fp_register_arguments <= 255, "always true"); // safety net
324 __ z_cli(d_fpcnt+7, Z_SP, max_fp_register_arguments);
325 __ z_brl(move_floatSlot_to_FARG);
326 __ z_ste(floatSlot, 4, arg_c);
327 __ add2reg(arg_c, BytesPerWord);
328 __ z_bru(loop_start);
329
330 // DOUBLE argument
331
332 BIND(do_double);
333 __ add2reg(arg_java, -2*BytesPerWord); // Decrement first to have positive displacement for lg.
334 __ z_ld(floatSlot, BytesPerWord, arg_java);
335 assert(max_fp_register_arguments <= 255, "always true"); // safety net
336 __ z_cli(d_fpcnt+7, Z_SP, max_fp_register_arguments);
337 __ z_brl(move_floatSlot_to_FARG);
338 __ z_std(floatSlot, 0, arg_c);
339 __ add2reg(arg_c, BytesPerWord);
340 __ z_bru(loop_start);
341
342 // Method exit, all arguments proocessed.
343 __ bind(loop_end);
344 __ pop_frame();
345 __ restore_return_pc();
346 __ z_lmg(Z_R10,Z_R13,-32,Z_SP);
347 __ z_br(Z_R14);
348
349 // Copy int arguments.
350
351 Label iarg_caselist; // Distance between each case has to be a power of 2
352 // (= 1 << LogSizeOfCase).
353 __ align(16);
354 BIND(iarg_caselist);
355 __ z_lgr(Z_ARG3, intSlot); // 4 bytes
356 __ z_bru(loop_start_restore); // 4 bytes
357
358 __ z_lgr(Z_ARG4, intSlot);
359 __ z_bru(loop_start_restore);
360
361 __ z_lgr(Z_ARG5, intSlot);
362 __ z_bru(loop_start_restore);
363
364 __ align(16);
365 __ bind(move_intSlot_to_ARG);
366 __ z_stg(signature, d_signature, Z_SP); // Spill since signature == Z_R1_scratch.
367 __ z_larl(Z_R1_scratch, iarg_caselist);
368 __ z_sllg(Z_R0_scratch, argcnt, LogSizeOfCase);
369 __ add2reg(argcnt, 1);
370 __ z_agr(Z_R1_scratch, Z_R0_scratch);
371 __ z_bcr(Assembler::bcondAlways, Z_R1_scratch);
372
373 // Copy float arguments.
374
375 Label farg_caselist; // Distance between each case has to be a power of 2
376 // (= 1 << logSizeOfCase, padded with nop.
377 __ align(16);
378 BIND(farg_caselist);
379 __ z_ldr(Z_FARG1, floatSlot); // 2 bytes
380 __ z_bru(loop_start_restore); // 4 bytes
381 __ z_nop(); // 2 bytes
382
383 __ z_ldr(Z_FARG2, floatSlot);
384 __ z_bru(loop_start_restore);
385 __ z_nop();
386
387 __ z_ldr(Z_FARG3, floatSlot);
388 __ z_bru(loop_start_restore);
389 __ z_nop();
390
391 __ z_ldr(Z_FARG4, floatSlot);
392 __ z_bru(loop_start_restore);
393 __ z_nop();
394
395 __ align(16);
396 __ bind(move_floatSlot_to_FARG);
397 __ z_stg(signature, d_signature, Z_SP); // Spill since signature == Z_R1_scratch.
398 __ z_lg(Z_R0_scratch, d_fpcnt, Z_SP); // Need old value for indexing.
399 __ add2mem_64(Address(Z_SP, d_fpcnt), 1, Z_R1_scratch); // Increment index.
400 __ z_larl(Z_R1_scratch, farg_caselist);
401 __ z_sllg(Z_R0_scratch, Z_R0_scratch, LogSizeOfCase);
402 __ z_agr(Z_R1_scratch, Z_R0_scratch);
403 __ z_bcr(Assembler::bcondAlways, Z_R1_scratch);
404
405 BLOCK_COMMENT("} slow_signature_handler");
406
407 return __ addr_at(entry_offset);
408 }
409
410 address TemplateInterpreterGenerator::generate_result_handler_for (BasicType type) {
411 address entry = __ pc();
412
413 assert(Z_tos == Z_RET, "Result handler: must move result!");
414 assert(Z_ftos == Z_FRET, "Result handler: must move float result!");
415
416 switch (type) {
417 case T_BOOLEAN:
418 __ c2bool(Z_tos);
419 break;
420 case T_CHAR:
421 __ and_imm(Z_tos, 0xffff);
422 break;
423 case T_BYTE:
424 __ z_lbr(Z_tos, Z_tos);
425 break;
426 case T_SHORT:
427 __ z_lhr(Z_tos, Z_tos);
428 break;
429 case T_INT:
430 case T_LONG:
431 case T_VOID:
432 case T_FLOAT:
433 case T_DOUBLE:
434 break;
435 case T_OBJECT:
436 // Retrieve result from frame...
437 __ mem2reg_opt(Z_tos, Address(Z_fp, oop_tmp_offset));
438 // and verify it.
439 __ verify_oop(Z_tos);
440 break;
441 default:
442 ShouldNotReachHere();
443 }
444 __ z_br(Z_R14); // Return from result handler.
445 return entry;
446 }
447
448 // Abstract method entry.
449 // Attempt to execute abstract method. Throw exception.
450 address TemplateInterpreterGenerator::generate_abstract_entry(void) {
451 unsigned int entry_offset = __ offset();
452
453 // Caller could be the call_stub or a compiled method (x86 version is wrong!).
454
455 BLOCK_COMMENT("abstract_entry {");
456
457 // Implement call of InterpreterRuntime::throw_AbstractMethodError.
458 __ set_top_ijava_frame_at_SP_as_last_Java_frame(Z_SP, Z_R1);
459 __ save_return_pc(); // Save Z_R14.
460 __ push_frame_abi160(0); // Without new frame the RT call could overwrite the saved Z_R14.
461
462 __ call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_AbstractMethodError), Z_thread);
463
464 __ pop_frame();
465 __ restore_return_pc(); // Restore Z_R14.
466 __ reset_last_Java_frame();
467
468 // Restore caller sp for c2i case.
469 __ resize_frame_absolute(Z_R10, Z_R0, true); // Cut the stack back to where the caller started.
470
471 // branch to SharedRuntime::generate_forward_exception() which handles all possible callers,
472 // i.e. call stub, compiled method, interpreted method.
473 __ load_absolute_address(Z_tmp_1, StubRoutines::forward_exception_entry());
474 __ z_br(Z_tmp_1);
475
476 BLOCK_COMMENT("} abstract_entry");
477
478 return __ addr_at(entry_offset);
479 }
480
481 address TemplateInterpreterGenerator::generate_Reference_get_entry(void) {
482 #if INCLUDE_ALL_GCS
483 if (UseG1GC) {
484 // Inputs:
485 // Z_ARG1 - receiver
486 //
487 // What we do:
488 // - Load the referent field address.
489 // - Load the value in the referent field.
490 // - Pass that value to the pre-barrier.
491 //
492 // In the case of G1 this will record the value of the
493 // referent in an SATB buffer if marking is active.
494 // This will cause concurrent marking to mark the referent
495 // field as live.
496
497 Register scratch1 = Z_tmp_2;
498 Register scratch2 = Z_tmp_3;
499 Register pre_val = Z_RET; // return value
500 // Z_esp is callers operand stack pointer, i.e. it points to the parameters.
501 Register Rargp = Z_esp;
502
503 Label slow_path;
504 address entry = __ pc();
505
506 const int referent_offset = java_lang_ref_Reference::referent_offset;
507 guarantee(referent_offset > 0, "referent offset not initialized");
508
509 BLOCK_COMMENT("Reference_get {");
510
511 // If the receiver is null then it is OK to jump to the slow path.
512 __ load_and_test_long(pre_val, Address(Rargp, Interpreter::stackElementSize)); // Get receiver.
513 __ z_bre(slow_path);
514
515 // Load the value of the referent field.
516 __ load_heap_oop(pre_val, referent_offset, pre_val);
517
518 // Restore caller sp for c2i case.
519 __ resize_frame_absolute(Z_R10, Z_R0, true); // Cut the stack back to where the caller started.
520
521 // Generate the G1 pre-barrier code to log the value of
522 // the referent field in an SATB buffer.
523 // Note:
524 // With these parameters the write_barrier_pre does not
525 // generate instructions to load the previous value.
526 __ g1_write_barrier_pre(noreg, // obj
527 noreg, // offset
528 pre_val, // pre_val
529 noreg, // no new val to preserve
530 scratch1, // tmp
531 scratch2, // tmp
532 true); // pre_val_needed
533
534 __ z_br(Z_R14);
535
536 // Branch to previously generated regular method entry.
537 __ bind(slow_path);
538
539 address meth_entry = Interpreter::entry_for_kind(Interpreter::zerolocals);
540 __ jump_to_entry(meth_entry, Z_R1);
541
542 BLOCK_COMMENT("} Reference_get");
543
544 return entry;
545 }
546 #endif // INCLUDE_ALL_GCS
547
548 return NULL;
549 }
550
551 address TemplateInterpreterGenerator::generate_StackOverflowError_handler() {
552 address entry = __ pc();
553
554 DEBUG_ONLY(__ verify_esp(Z_esp, Z_ARG5));
555
556 // Restore bcp under the assumption that the current frame is still
557 // interpreted.
558 __ restore_bcp();
559
560 // Expression stack must be empty before entering the VM if an
561 // exception happened.
562 __ empty_expression_stack();
563 // Throw exception.
564 __ call_VM(noreg,
565 CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_StackOverflowError));
566 return entry;
567 }
568
569 //
570 // Args:
571 // Z_ARG3: aberrant index
572 //
573 address TemplateInterpreterGenerator::generate_ArrayIndexOutOfBounds_handler(const char * name) {
574 address entry = __ pc();
575 address excp = CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_ArrayIndexOutOfBoundsException);
576
577 // Expression stack must be empty before entering the VM if an
578 // exception happened.
579 __ empty_expression_stack();
580
581 // Setup parameters.
582 // Leave out the name and use register for array to create more detailed exceptions.
583 __ load_absolute_address(Z_ARG2, (address) name);
584 __ call_VM(noreg, excp, Z_ARG2, Z_ARG3);
585 return entry;
586 }
587
588 address TemplateInterpreterGenerator::generate_ClassCastException_handler() {
589 address entry = __ pc();
590
591 // Object is at TOS.
592 __ pop_ptr(Z_ARG2);
593
594 // Expression stack must be empty before entering the VM if an
595 // exception happened.
596 __ empty_expression_stack();
597
598 __ call_VM(Z_ARG1,
599 CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_ClassCastException),
600 Z_ARG2);
601
602 DEBUG_ONLY(__ should_not_reach_here();)
603
604 return entry;
605 }
606
607 address TemplateInterpreterGenerator::generate_exception_handler_common(const char* name, const char* message, bool pass_oop) {
608 assert(!pass_oop || message == NULL, "either oop or message but not both");
609 address entry = __ pc();
610
611 BLOCK_COMMENT("exception_handler_common {");
612
613 // Expression stack must be empty before entering the VM if an
614 // exception happened.
615 __ empty_expression_stack();
616 if (name != NULL) {
617 __ load_absolute_address(Z_ARG2, (address)name);
618 } else {
619 __ clear_reg(Z_ARG2, true, false);
620 }
621
622 if (pass_oop) {
623 __ call_VM(Z_tos,
624 CAST_FROM_FN_PTR(address, InterpreterRuntime::create_klass_exception),
625 Z_ARG2, Z_tos /*object (see TT::aastore())*/);
626 } else {
627 if (message != NULL) {
628 __ load_absolute_address(Z_ARG3, (address)message);
629 } else {
630 __ clear_reg(Z_ARG3, true, false);
631 }
632 __ call_VM(Z_tos,
633 CAST_FROM_FN_PTR(address, InterpreterRuntime::create_exception),
634 Z_ARG2, Z_ARG3);
635 }
636 // Throw exception.
637 __ load_absolute_address(Z_R1_scratch, Interpreter::throw_exception_entry());
638 __ z_br(Z_R1_scratch);
639
640 BLOCK_COMMENT("} exception_handler_common");
641
642 return entry;
643 }
644
645 // Unused, should never pass by.
646 address TemplateInterpreterGenerator::generate_continuation_for (TosState state) {
647 address entry = __ pc();
648 __ should_not_reach_here();
649 return entry;
650 }
651
652 address TemplateInterpreterGenerator::generate_return_entry_for (TosState state, int step, size_t index_size) {
653 address entry = __ pc();
654
655 BLOCK_COMMENT("return_entry {");
656
657 // Pop i2c extension or revert top-2-parent-resize done by interpreted callees.
658 Register sp_before_i2c_extension = Z_bcp;
659 __ z_lg(Z_fp, _z_abi(callers_sp), Z_SP); // Restore frame pointer.
660 __ z_lg(sp_before_i2c_extension, Address(Z_fp, _z_ijava_state_neg(top_frame_sp)));
661 __ resize_frame_absolute(sp_before_i2c_extension, Z_locals/*tmp*/, true/*load_fp*/);
662
663 // TODO(ZASM): necessary??
664 // // and NULL it as marker that esp is now tos until next java call
665 // __ movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), (int32_t)NULL_WORD);
666
667 __ restore_bcp();
668 __ restore_locals();
669 __ restore_esp();
670
671 if (state == atos) {
672 __ profile_return_type(Z_tmp_1, Z_tos, Z_tmp_2);
673 }
674
675 Register cache = Z_tmp_1;
676 Register size = Z_tmp_1;
677 Register offset = Z_tmp_2;
678 const int flags_offset = in_bytes(ConstantPoolCache::base_offset() +
679 ConstantPoolCacheEntry::flags_offset());
680 __ get_cache_and_index_at_bcp(cache, offset, 1, index_size);
681
682 // #args is in rightmost byte of the _flags field.
683 __ z_llgc(size, Address(cache, offset, flags_offset+(sizeof(size_t)-1)));
684 __ z_sllg(size, size, Interpreter::logStackElementSize); // Each argument size in bytes.
685 __ z_agr(Z_esp, size); // Pop arguments.
686 __ dispatch_next(state, step);
687
688 BLOCK_COMMENT("} return_entry");
689
690 return entry;
691 }
692
693 address TemplateInterpreterGenerator::generate_deopt_entry_for (TosState state,
694 int step) {
695 address entry = __ pc();
696
697 BLOCK_COMMENT("deopt_entry {");
698
699 // TODO(ZASM): necessary? NULL last_sp until next java call
700 // __ movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), (int32_t)NULL_WORD);
701 __ z_lg(Z_fp, _z_abi(callers_sp), Z_SP); // Restore frame pointer.
702 __ restore_bcp();
703 __ restore_locals();
704 __ restore_esp();
705
706 // Handle exceptions.
707 {
708 Label L;
709 __ load_and_test_long(Z_R0/*pending_exception*/, thread_(pending_exception));
710 __ z_bre(L);
711 __ call_VM(noreg,
712 CAST_FROM_FN_PTR(address,
713 InterpreterRuntime::throw_pending_exception));
714 __ should_not_reach_here();
715 __ bind(L);
716 }
717 __ dispatch_next(state, step);
718
719 BLOCK_COMMENT("} deopt_entry");
720
721 return entry;
722 }
723
724 address TemplateInterpreterGenerator::generate_safept_entry_for (TosState state,
725 address runtime_entry) {
726 address entry = __ pc();
727 __ push(state);
728 __ call_VM(noreg, runtime_entry);
729 __ dispatch_via(vtos, Interpreter::_normal_table.table_for (vtos));
730 return entry;
731 }
732
733 //
734 // Helpers for commoning out cases in the various type of method entries.
735 //
736
737 // Increment invocation count & check for overflow.
738 //
739 // Note: checking for negative value instead of overflow
740 // so we have a 'sticky' overflow test.
741 //
742 // Z_ARG2: method (see generate_fixed_frame())
743 //
744 void TemplateInterpreterGenerator::generate_counter_incr(Label* overflow, Label* profile_method, Label* profile_method_continue) {
745 Label done;
746 Register method = Z_ARG2; // Generate_fixed_frame() copies Z_method into Z_ARG2.
747 Register m_counters = Z_ARG4;
748
749 BLOCK_COMMENT("counter_incr {");
750
751 // Note: In tiered we increment either counters in method or in MDO depending
752 // if we are profiling or not.
753 if (TieredCompilation) {
754 int increment = InvocationCounter::count_increment;
755 if (ProfileInterpreter) {
756 NearLabel no_mdo;
757 Register mdo = m_counters;
758 // Are we profiling?
759 __ load_and_test_long(mdo, method2_(method, method_data));
760 __ branch_optimized(Assembler::bcondZero, no_mdo);
761 // Increment counter in the MDO.
762 const Address mdo_invocation_counter(mdo, MethodData::invocation_counter_offset() +
763 InvocationCounter::counter_offset());
764 const Address mask(mdo, MethodData::invoke_mask_offset());
765 __ increment_mask_and_jump(mdo_invocation_counter, increment, mask,
766 Z_R1_scratch, false, Assembler::bcondZero,
767 overflow);
768 __ z_bru(done);
769 __ bind(no_mdo);
770 }
771
772 // Increment counter in MethodCounters.
773 const Address invocation_counter(m_counters,
774 MethodCounters::invocation_counter_offset() +
775 InvocationCounter::counter_offset());
776 // Get address of MethodCounters object.
777 __ get_method_counters(method, m_counters, done);
778 const Address mask(m_counters, MethodCounters::invoke_mask_offset());
779 __ increment_mask_and_jump(invocation_counter,
780 increment, mask,
781 Z_R1_scratch, false, Assembler::bcondZero,
782 overflow);
783 } else {
784 Register counter_sum = Z_ARG3; // The result of this piece of code.
785 Register tmp = Z_R1_scratch;
786 #ifdef ASSERT
787 {
788 NearLabel ok;
789 __ get_method(tmp);
790 __ compare64_and_branch(method, tmp, Assembler::bcondEqual, ok);
791 __ z_illtrap(0x66);
792 __ bind(ok);
793 }
794 #endif
795
796 // Get address of MethodCounters object.
797 __ get_method_counters(method, m_counters, done);
798 // Update standard invocation counters.
799 __ increment_invocation_counter(m_counters, counter_sum);
800 if (ProfileInterpreter) {
801 __ add2mem_32(Address(m_counters, MethodCounters::interpreter_invocation_counter_offset()), 1, tmp);
802 if (profile_method != NULL) {
803 const Address profile_limit(m_counters, MethodCounters::interpreter_profile_limit_offset());
804 __ z_cl(counter_sum, profile_limit);
805 __ branch_optimized(Assembler::bcondLow, *profile_method_continue);
806 // If no method data exists, go to profile_method.
807 __ test_method_data_pointer(tmp, *profile_method);
808 }
809 }
810
811 const Address invocation_limit(m_counters, MethodCounters::interpreter_invocation_limit_offset());
812 __ z_cl(counter_sum, invocation_limit);
813 __ branch_optimized(Assembler::bcondNotLow, *overflow);
814 }
815
816 __ bind(done);
817
818 BLOCK_COMMENT("} counter_incr");
819 }
820
821 void TemplateInterpreterGenerator::generate_counter_overflow(Label& do_continue) {
822 // InterpreterRuntime::frequency_counter_overflow takes two
823 // arguments, the first (thread) is passed by call_VM, the second
824 // indicates if the counter overflow occurs at a backwards branch
825 // (NULL bcp). We pass zero for it. The call returns the address
826 // of the verified entry point for the method or NULL if the
827 // compilation did not complete (either went background or bailed
828 // out).
829 __ clear_reg(Z_ARG2);
830 __ call_VM(noreg,
831 CAST_FROM_FN_PTR(address, InterpreterRuntime::frequency_counter_overflow),
832 Z_ARG2);
833 __ z_bru(do_continue);
834 }
835
836 void TemplateInterpreterGenerator::generate_stack_overflow_check(Register frame_size, Register tmp1) {
837 Register tmp2 = Z_R1_scratch;
838 const int page_size = os::vm_page_size();
839 NearLabel after_frame_check;
840
841 BLOCK_COMMENT("counter_overflow {");
842
843 assert_different_registers(frame_size, tmp1);
844
845 // Stack banging is sufficient overflow check if frame_size < page_size.
846 if (Immediate::is_uimm(page_size, 15)) {
847 __ z_chi(frame_size, page_size);
848 __ z_brl(after_frame_check);
849 } else {
850 __ load_const_optimized(tmp1, page_size);
851 __ compareU32_and_branch(frame_size, tmp1, Assembler::bcondLow, after_frame_check);
852 }
853
854 // Get the stack base, and in debug, verify it is non-zero.
855 __ z_lg(tmp1, thread_(stack_base));
856 #ifdef ASSERT
857 address reentry = NULL;
858 NearLabel base_not_zero;
859 __ compareU64_and_branch(tmp1, (intptr_t)0L, Assembler::bcondNotEqual, base_not_zero);
860 reentry = __ stop_chain_static(reentry, "stack base is zero in generate_stack_overflow_check");
861 __ bind(base_not_zero);
862 #endif
863
864 // Get the stack size, and in debug, verify it is non-zero.
865 assert(sizeof(size_t) == sizeof(intptr_t), "wrong load size");
866 __ z_lg(tmp2, thread_(stack_size));
867 #ifdef ASSERT
868 NearLabel size_not_zero;
869 __ compareU64_and_branch(tmp2, (intptr_t)0L, Assembler::bcondNotEqual, size_not_zero);
870 reentry = __ stop_chain_static(reentry, "stack size is zero in generate_stack_overflow_check");
871 __ bind(size_not_zero);
872 #endif
873
874 // Compute the beginning of the protected zone minus the requested frame size.
875 __ z_sgr(tmp1, tmp2);
876 __ add2reg(tmp1, JavaThread::stack_guard_zone_size());
877
878 // Add in the size of the frame (which is the same as subtracting it from the
879 // SP, which would take another register.
880 __ z_agr(tmp1, frame_size);
881
882 // The frame is greater than one page in size, so check against
883 // the bottom of the stack.
884 __ compareU64_and_branch(Z_SP, tmp1, Assembler::bcondHigh, after_frame_check);
885
886 // The stack will overflow, throw an exception.
887
888 // Restore SP to sender's sp. This is necessary if the sender's frame is an
889 // extended compiled frame (see gen_c2i_adapter()) and safer anyway in case of
890 // JSR292 adaptations.
891 __ resize_frame_absolute(Z_R10, tmp1, true/*load_fp*/);
892
893 // Note also that the restored frame is not necessarily interpreted.
894 // Use the shared runtime version of the StackOverflowError.
895 assert(StubRoutines::throw_StackOverflowError_entry() != NULL, "stub not yet generated");
896 AddressLiteral stub(StubRoutines::throw_StackOverflowError_entry());
897 __ load_absolute_address(tmp1, StubRoutines::throw_StackOverflowError_entry());
898 __ z_br(tmp1);
899
900 // If you get to here, then there is enough stack space.
901 __ bind(after_frame_check);
902
903 BLOCK_COMMENT("} counter_overflow");
904 }
905
906 // Allocate monitor and lock method (asm interpreter).
907 //
908 // Args:
909 // Z_locals: locals
910
911 void TemplateInterpreterGenerator::lock_method(void) {
912
913 BLOCK_COMMENT("lock_method {");
914
915 // Synchronize method.
916 const Register method = Z_tmp_2;
917 __ get_method(method);
918
919 #ifdef ASSERT
920 address reentry = NULL;
921 {
922 Label L;
923 __ testbit(method2_(method, access_flags), JVM_ACC_SYNCHRONIZED_BIT);
924 __ z_btrue(L);
925 reentry = __ stop_chain_static(reentry, "method doesn't need synchronization");
926 __ bind(L);
927 }
928 #endif // ASSERT
929
930 // Get synchronization object.
931 const Register object = Z_tmp_2;
932
933 {
934 Label done;
935 Label static_method;
936
937 __ testbit(method2_(method, access_flags), JVM_ACC_STATIC_BIT);
938 __ z_btrue(static_method);
939
940 // non-static method: Load receiver obj from stack.
941 __ mem2reg_opt(object, Address(Z_locals, Interpreter::local_offset_in_bytes(0)));
942 __ z_bru(done);
943
944 __ bind(static_method);
945
946 // Lock the java mirror.
947 __ load_mirror(object, method);
948 #ifdef ASSERT
949 {
950 NearLabel L;
951 __ compare64_and_branch(object, (intptr_t) 0, Assembler::bcondNotEqual, L);
952 reentry = __ stop_chain_static(reentry, "synchronization object is NULL");
953 __ bind(L);
954 }
955 #endif // ASSERT
956
957 __ bind(done);
958 }
959
960 __ add_monitor_to_stack(true, Z_ARG3, Z_ARG4, Z_ARG5); // Allocate monitor elem.
961 // Store object and lock it.
962 __ get_monitors(Z_tmp_1);
963 __ reg2mem_opt(object, Address(Z_tmp_1, BasicObjectLock::obj_offset_in_bytes()));
964 __ lock_object(Z_tmp_1, object);
965
966 BLOCK_COMMENT("} lock_method");
967 }
968
969 // Generate a fixed interpreter frame. This is identical setup for
970 // interpreted methods and for native methods hence the shared code.
971 //
972 // Registers alive
973 // Z_thread - JavaThread*
974 // Z_SP - old stack pointer
975 // Z_method - callee's method
976 // Z_esp - parameter list (slot 'above' last param)
977 // Z_R14 - return pc, to be stored in caller's frame
978 // Z_R10 - sender sp, note: Z_tmp_1 is Z_R10!
979 //
980 // Registers updated
981 // Z_SP - new stack pointer
982 // Z_esp - callee's operand stack pointer
983 // points to the slot above the value on top
984 // Z_locals - used to access locals: locals[i] := *(Z_locals - i*BytesPerWord)
985 // Z_bcp - the bytecode pointer
986 // Z_fp - the frame pointer, thereby killing Z_method
987 // Z_ARG2 - copy of Z_method
988 //
989 void TemplateInterpreterGenerator::generate_fixed_frame(bool native_call) {
990
991 // stack layout
992 //
993 // F1 [TOP_IJAVA_FRAME_ABI] <-- Z_SP, Z_R10 (see note below)
994 // [F1's operand stack (unused)]
995 // [F1's outgoing Java arguments] <-- Z_esp
996 // [F1's operand stack (non args)]
997 // [monitors] (optional)
998 // [IJAVA_STATE]
999 //
1000 // F2 [PARENT_IJAVA_FRAME_ABI]
1001 // ...
1002 //
1003 // 0x000
1004 //
1005 // Note: Z_R10, the sender sp, will be below Z_SP if F1 was extended by a c2i adapter.
1006
1007 //=============================================================================
1008 // Allocate space for locals other than the parameters, the
1009 // interpreter state, monitors, and the expression stack.
1010
1011 const Register local_count = Z_ARG5;
1012 const Register fp = Z_tmp_2;
1013
1014 BLOCK_COMMENT("generate_fixed_frame {");
1015
1016 {
1017 // local registers
1018 const Register top_frame_size = Z_ARG2;
1019 const Register sp_after_resize = Z_ARG3;
1020 const Register max_stack = Z_ARG4;
1021
1022 // local_count = method->constMethod->max_locals();
1023 __ z_lg(Z_R1_scratch, Address(Z_method, Method::const_offset()));
1024 __ z_llgh(local_count, Address(Z_R1_scratch, ConstMethod::size_of_locals_offset()));
1025
1026 if (native_call) {
1027 // If we're calling a native method, we replace max_stack (which is
1028 // zero) with space for the worst-case signature handler varargs
1029 // vector, which is:
1030 // max_stack = max(Argument::n_register_parameters, parameter_count+2);
1031 //
1032 // We add two slots to the parameter_count, one for the jni
1033 // environment and one for a possible native mirror. We allocate
1034 // space for at least the number of ABI registers, even though
1035 // InterpreterRuntime::slow_signature_handler won't write more than
1036 // parameter_count+2 words when it creates the varargs vector at the
1037 // top of the stack. The generated slow signature handler will just
1038 // load trash into registers beyond the necessary number. We're
1039 // still going to cut the stack back by the ABI register parameter
1040 // count so as to get SP+16 pointing at the ABI outgoing parameter
1041 // area, so we need to allocate at least that much even though we're
1042 // going to throw it away.
1043 //
1044
1045 __ z_lg(Z_R1_scratch, Address(Z_method, Method::const_offset()));
1046 __ z_llgh(max_stack, Address(Z_R1_scratch, ConstMethod::size_of_parameters_offset()));
1047 __ add2reg(max_stack, 2);
1048
1049 NearLabel passing_args_on_stack;
1050
1051 // max_stack in bytes
1052 __ z_sllg(max_stack, max_stack, LogBytesPerWord);
1053
1054 int argument_registers_in_bytes = Argument::n_register_parameters << LogBytesPerWord;
1055 __ compare64_and_branch(max_stack, argument_registers_in_bytes, Assembler::bcondNotLow, passing_args_on_stack);
1056
1057 __ load_const_optimized(max_stack, argument_registers_in_bytes);
1058
1059 __ bind(passing_args_on_stack);
1060 } else {
1061 // !native_call
1062 __ z_lg(max_stack, method_(const));
1063
1064 // Calculate number of non-parameter locals (in slots):
1065 __ z_lg(Z_R1_scratch, Address(Z_method, Method::const_offset()));
1066 __ z_sh(local_count, Address(Z_R1_scratch, ConstMethod::size_of_parameters_offset()));
1067
1068 // max_stack = method->max_stack();
1069 __ z_llgh(max_stack, Address(max_stack, ConstMethod::max_stack_offset()));
1070 // max_stack in bytes
1071 __ z_sllg(max_stack, max_stack, LogBytesPerWord);
1072 }
1073
1074 // Resize (i.e. normally shrink) the top frame F1 ...
1075 // F1 [TOP_IJAVA_FRAME_ABI] <-- Z_SP, Z_R10
1076 // F1's operand stack (free)
1077 // ...
1078 // F1's operand stack (free) <-- Z_esp
1079 // F1's outgoing Java arg m
1080 // ...
1081 // F1's outgoing Java arg 0
1082 // ...
1083 //
1084 // ... into a parent frame (Z_R10 holds F1's SP before any modification, see also above)
1085 //
1086 // +......................+
1087 // : : <-- Z_R10, saved below as F0's z_ijava_state.sender_sp
1088 // : :
1089 // F1 [PARENT_IJAVA_FRAME_ABI] <-- Z_SP \
1090 // F0's non arg local | = delta
1091 // ... |
1092 // F0's non arg local <-- Z_esp /
1093 // F1's outgoing Java arg m
1094 // ...
1095 // F1's outgoing Java arg 0
1096 // ...
1097 //
1098 // then push the new top frame F0.
1099 //
1100 // F0 [TOP_IJAVA_FRAME_ABI] = frame::z_top_ijava_frame_abi_size \
1101 // [operand stack] = max_stack | = top_frame_size
1102 // [IJAVA_STATE] = frame::z_ijava_state_size /
1103
1104 // sp_after_resize = Z_esp - delta
1105 //
1106 // delta = PARENT_IJAVA_FRAME_ABI + (locals_count - params_count)
1107
1108 __ add2reg(sp_after_resize, (Interpreter::stackElementSize) - (frame::z_parent_ijava_frame_abi_size), Z_esp);
1109 __ z_sllg(Z_R0_scratch, local_count, LogBytesPerWord); // Params have already been subtracted from local_count.
1110 __ z_slgr(sp_after_resize, Z_R0_scratch);
1111
1112 // top_frame_size = TOP_IJAVA_FRAME_ABI + max_stack + size of interpreter state
1113 __ add2reg(top_frame_size,
1114 frame::z_top_ijava_frame_abi_size +
1115 frame::z_ijava_state_size +
1116 frame::interpreter_frame_monitor_size() * wordSize,
1117 max_stack);
1118
1119 // Check if there's room for the new frame...
1120 Register frame_size = max_stack; // Reuse the regiser for max_stack.
1121 __ z_lgr(frame_size, Z_SP);
1122 __ z_sgr(frame_size, sp_after_resize);
1123 __ z_agr(frame_size, top_frame_size);
1124 generate_stack_overflow_check(frame_size, fp/*tmp1*/);
1125
1126 DEBUG_ONLY(__ z_cg(Z_R14, _z_abi16(return_pc), Z_SP));
1127 __ asm_assert_eq("killed Z_R14", 0);
1128 __ resize_frame_absolute(sp_after_resize, fp, true);
1129 __ save_return_pc(Z_R14);
1130
1131 // ... and push the new frame F0.
1132 __ push_frame(top_frame_size, fp, true /*copy_sp*/, false);
1133 }
1134
1135 //=============================================================================
1136 // Initialize the new frame F0: initialize interpreter state.
1137
1138 {
1139 // locals
1140 const Register local_addr = Z_ARG4;
1141
1142 BLOCK_COMMENT("generate_fixed_frame: initialize interpreter state {");
1143
1144 #ifdef ASSERT
1145 // Set the magic number (using local_addr as tmp register).
1146 __ load_const_optimized(local_addr, frame::z_istate_magic_number);
1147 __ z_stg(local_addr, _z_ijava_state_neg(magic), fp);
1148 #endif
1149
1150 // Save sender SP from F1 (i.e. before it was potentially modified by an
1151 // adapter) into F0's interpreter state. We us it as well to revert
1152 // resizing the frame above.
1153 __ z_stg(Z_R10, _z_ijava_state_neg(sender_sp), fp);
1154
1155 // Load cp cache and save it at the and of this block.
1156 __ z_lg(Z_R1_scratch, Address(Z_method, Method::const_offset()));
1157 __ z_lg(Z_R1_scratch, Address(Z_R1_scratch, ConstMethod::constants_offset()));
1158 __ z_lg(Z_R1_scratch, Address(Z_R1_scratch, ConstantPool::cache_offset_in_bytes()));
1159
1160 // z_ijava_state->method = method;
1161 __ z_stg(Z_method, _z_ijava_state_neg(method), fp);
1162
1163 // Point locals at the first argument. Method's locals are the
1164 // parameters on top of caller's expression stack.
1165 // Tos points past last Java argument.
1166
1167 __ z_lg(Z_locals, Address(Z_method, Method::const_offset()));
1168 __ z_llgh(Z_locals /*parameter_count words*/,
1169 Address(Z_locals, ConstMethod::size_of_parameters_offset()));
1170 __ z_sllg(Z_locals /*parameter_count bytes*/, Z_locals /*parameter_count*/, LogBytesPerWord);
1171 __ z_agr(Z_locals, Z_esp);
1172 // z_ijava_state->locals - i*BytesPerWord points to i-th Java local (i starts at 0)
1173 // z_ijava_state->locals = Z_esp + parameter_count bytes
1174 __ z_stg(Z_locals, _z_ijava_state_neg(locals), fp);
1175
1176 // z_ijava_state->oop_temp = NULL;
1177 __ store_const(Address(fp, oop_tmp_offset), 0);
1178
1179 // Initialize z_ijava_state->mdx.
1180 Register Rmdp = Z_bcp;
1181 // native_call: assert that mdo == NULL
1182 const bool check_for_mdo = !native_call DEBUG_ONLY(|| native_call);
1183 if (ProfileInterpreter && check_for_mdo) {
1184 #ifdef FAST_DISPATCH
1185 // FAST_DISPATCH and ProfileInterpreter are mutually exclusive since
1186 // they both use I2.
1187 assert(0, "FAST_DISPATCH and +ProfileInterpreter are mutually exclusive");
1188 #endif // FAST_DISPATCH
1189 Label get_continue;
1190
1191 __ load_and_test_long(Rmdp, method_(method_data));
1192 __ z_brz(get_continue);
1193 DEBUG_ONLY(if (native_call) __ stop("native methods don't have a mdo"));
1194 __ add2reg(Rmdp, in_bytes(MethodData::data_offset()));
1195 __ bind(get_continue);
1196 }
1197 __ z_stg(Rmdp, _z_ijava_state_neg(mdx), fp);
1198
1199 // Initialize z_ijava_state->bcp and Z_bcp.
1200 if (native_call) {
1201 __ clear_reg(Z_bcp); // Must initialize. Will get written into frame where GC reads it.
1202 } else {
1203 __ z_lg(Z_bcp, method_(const));
1204 __ add2reg(Z_bcp, in_bytes(ConstMethod::codes_offset()));
1205 }
1206 __ z_stg(Z_bcp, _z_ijava_state_neg(bcp), fp);
1207
1208 // no monitors and empty operand stack
1209 // => z_ijava_state->monitors points to the top slot in IJAVA_STATE.
1210 // => Z_ijava_state->esp points one slot above into the operand stack.
1211 // z_ijava_state->monitors = fp - frame::z_ijava_state_size - Interpreter::stackElementSize;
1212 // z_ijava_state->esp = Z_esp = z_ijava_state->monitors;
1213 __ add2reg(Z_esp, -frame::z_ijava_state_size, fp);
1214 __ z_stg(Z_esp, _z_ijava_state_neg(monitors), fp);
1215 __ add2reg(Z_esp, -Interpreter::stackElementSize);
1216 __ z_stg(Z_esp, _z_ijava_state_neg(esp), fp);
1217
1218 // z_ijava_state->cpoolCache = Z_R1_scratch (see load above);
1219 __ z_stg(Z_R1_scratch, _z_ijava_state_neg(cpoolCache), fp);
1220
1221 // Get mirror and store it in the frame as GC root for this Method*.
1222 __ load_mirror(Z_R1_scratch, Z_method);
1223 __ z_stg(Z_R1_scratch, _z_ijava_state_neg(mirror), fp);
1224
1225 BLOCK_COMMENT("} generate_fixed_frame: initialize interpreter state");
1226
1227 //=============================================================================
1228 if (!native_call) {
1229 // Fill locals with 0x0s.
1230 NearLabel locals_zeroed;
1231 NearLabel doXC;
1232
1233 // Local_count is already num_locals_slots - num_param_slots.
1234 __ compare64_and_branch(local_count, (intptr_t)0L, Assembler::bcondNotHigh, locals_zeroed);
1235
1236 // Advance local_addr to point behind locals (creates positive incr. in loop).
1237 __ z_lg(Z_R1_scratch, Address(Z_method, Method::const_offset()));
1238 __ z_llgh(Z_R0_scratch,
1239 Address(Z_R1_scratch, ConstMethod::size_of_locals_offset()));
1240 if (Z_R0_scratch == Z_R0) {
1241 __ z_aghi(Z_R0_scratch, -1);
1242 } else {
1243 __ add2reg(Z_R0_scratch, -1);
1244 }
1245 __ z_lgr(local_addr/*locals*/, Z_locals);
1246 __ z_sllg(Z_R0_scratch, Z_R0_scratch, LogBytesPerWord);
1247 __ z_sllg(local_count, local_count, LogBytesPerWord); // Local_count are non param locals.
1248 __ z_sgr(local_addr, Z_R0_scratch);
1249
1250 if (VM_Version::has_Prefetch()) {
1251 __ z_pfd(0x02, 0, Z_R0, local_addr);
1252 __ z_pfd(0x02, 256, Z_R0, local_addr);
1253 }
1254
1255 // Can't optimise for Z10 using "compare and branch" (immediate value is too big).
1256 __ z_cghi(local_count, 256);
1257 __ z_brnh(doXC);
1258
1259 // MVCLE: Initialize if quite a lot locals.
1260 // __ bind(doMVCLE);
1261 __ z_lgr(Z_R0_scratch, local_addr);
1262 __ z_lgr(Z_R1_scratch, local_count);
1263 __ clear_reg(Z_ARG2); // Src len of MVCLE is zero.
1264
1265 __ MacroAssembler::move_long_ext(Z_R0_scratch, Z_ARG1, 0);
1266 __ z_bru(locals_zeroed);
1267
1268 Label XC_template;
1269 __ bind(XC_template);
1270 __ z_xc(0, 0, local_addr, 0, local_addr);
1271
1272 __ bind(doXC);
1273 __ z_bctgr(local_count, Z_R0); // Get #bytes-1 for EXECUTE.
1274 if (VM_Version::has_ExecuteExtensions()) {
1275 __ z_exrl(local_count, XC_template); // Execute XC with variable length.
1276 } else {
1277 __ z_larl(Z_R1_scratch, XC_template);
1278 __ z_ex(local_count, 0, Z_R0, Z_R1_scratch); // Execute XC with variable length.
1279 }
1280
1281 __ bind(locals_zeroed);
1282 }
1283
1284 }
1285 // Finally set the frame pointer, destroying Z_method.
1286 assert(Z_fp == Z_method, "maybe set Z_fp earlier if other register than Z_method");
1287 // Oprofile analysis suggests to keep a copy in a register to be used by
1288 // generate_counter_incr().
1289 __ z_lgr(Z_ARG2, Z_method);
1290 __ z_lgr(Z_fp, fp);
1291
1292 BLOCK_COMMENT("} generate_fixed_frame");
1293 }
1294
1295 // Various method entries
1296
1297 // Math function, frame manager must set up an interpreter state, etc.
1298 address TemplateInterpreterGenerator::generate_math_entry(AbstractInterpreter::MethodKind kind) {
1299
1300 if (!InlineIntrinsics) { return NULL; } // Generate a vanilla entry.
1301
1302 // Only support absolute value and square root.
1303 if (kind != Interpreter::java_lang_math_abs && kind != Interpreter::java_lang_math_sqrt) {
1304 return NULL;
1305 }
1306
1307 BLOCK_COMMENT("math_entry {");
1308
1309 address math_entry = __ pc();
1310
1311 if (kind == Interpreter::java_lang_math_abs) {
1312 // Load operand from stack.
1313 __ mem2freg_opt(Z_FRET, Address(Z_esp, Interpreter::stackElementSize));
1314 __ z_lpdbr(Z_FRET);
1315 } else {
1316 // sqrt
1317 // Can use memory operand directly.
1318 __ z_sqdb(Z_FRET, Interpreter::stackElementSize, Z_esp);
1319 }
1320
1321 // Restore caller sp for c2i case.
1322 __ resize_frame_absolute(Z_R10, Z_R0, true); // Cut the stack back to where the caller started.
1323
1324 // We are done, return.
1325 __ z_br(Z_R14);
1326
1327 BLOCK_COMMENT("} math_entry");
1328
1329 return math_entry;
1330 }
1331
1332 // Interpreter stub for calling a native method. (asm interpreter).
1333 // This sets up a somewhat different looking stack for calling the
1334 // native method than the typical interpreter frame setup.
1335 address TemplateInterpreterGenerator::generate_native_entry(bool synchronized) {
1336 // Determine code generation flags.
1337 bool inc_counter = UseCompiler || CountCompiledCalls || LogTouchedMethods;
1338
1339 // Interpreter entry for ordinary Java methods.
1340 //
1341 // Registers alive
1342 // Z_SP - stack pointer
1343 // Z_thread - JavaThread*
1344 // Z_method - callee's method (method to be invoked)
1345 // Z_esp - operand (or expression) stack pointer of caller. one slot above last arg.
1346 // Z_R10 - sender sp (before modifications, e.g. by c2i adapter
1347 // and as well by generate_fixed_frame below)
1348 // Z_R14 - return address to caller (call_stub or c2i_adapter)
1349 //
1350 // Registers updated
1351 // Z_SP - stack pointer
1352 // Z_fp - callee's framepointer
1353 // Z_esp - callee's operand stack pointer
1354 // points to the slot above the value on top
1355 // Z_locals - used to access locals: locals[i] := *(Z_locals - i*BytesPerWord)
1356 // Z_tos - integer result, if any
1357 // z_ftos - floating point result, if any
1358 //
1359 // Stack layout at this point:
1360 //
1361 // F1 [TOP_IJAVA_FRAME_ABI] <-- Z_SP, Z_R10 (Z_R10 will be below Z_SP if
1362 // frame was extended by c2i adapter)
1363 // [outgoing Java arguments] <-- Z_esp
1364 // ...
1365 // PARENT [PARENT_IJAVA_FRAME_ABI]
1366 // ...
1367 //
1368
1369 address entry_point = __ pc();
1370
1371 // Make sure registers are different!
1372 assert_different_registers(Z_thread, Z_method, Z_esp);
1373
1374 BLOCK_COMMENT("native_entry {");
1375
1376 // Make sure method is native and not abstract.
1377 #ifdef ASSERT
1378 address reentry = NULL;
1379 { Label L;
1380 __ testbit(method_(access_flags), JVM_ACC_NATIVE_BIT);
1381 __ z_btrue(L);
1382 reentry = __ stop_chain_static(reentry, "tried to execute non-native method as native");
1383 __ bind(L);
1384 }
1385 { Label L;
1386 __ testbit(method_(access_flags), JVM_ACC_ABSTRACT_BIT);
1387 __ z_bfalse(L);
1388 reentry = __ stop_chain_static(reentry, "tried to execute abstract method as non-abstract");
1389 __ bind(L);
1390 }
1391 #endif // ASSERT
1392
1393 #ifdef ASSERT
1394 // Save the return PC into the callers frame for assertion in generate_fixed_frame.
1395 __ save_return_pc(Z_R14);
1396 #endif
1397
1398 // Generate the code to allocate the interpreter stack frame.
1399 generate_fixed_frame(true);
1400
1401 const Address do_not_unlock_if_synchronized(Z_thread, JavaThread::do_not_unlock_if_synchronized_offset());
1402 // Since at this point in the method invocation the exception handler
1403 // would try to exit the monitor of synchronized methods which hasn't
1404 // been entered yet, we set the thread local variable
1405 // _do_not_unlock_if_synchronized to true. If any exception was thrown by
1406 // runtime, exception handling i.e. unlock_if_synchronized_method will
1407 // check this thread local flag.
1408 __ z_mvi(do_not_unlock_if_synchronized, true);
1409
1410 // Increment invocation count and check for overflow.
1411 NearLabel invocation_counter_overflow;
1412 if (inc_counter) {
1413 generate_counter_incr(&invocation_counter_overflow, NULL, NULL);
1414 }
1415
1416 Label continue_after_compile;
1417 __ bind(continue_after_compile);
1418
1419 bang_stack_shadow_pages(true);
1420
1421 // Reset the _do_not_unlock_if_synchronized flag.
1422 __ z_mvi(do_not_unlock_if_synchronized, false);
1423
1424 // Check for synchronized methods.
1425 // This mst happen AFTER invocation_counter check and stack overflow check,
1426 // so method is not locked if overflows.
1427 if (synchronized) {
1428 lock_method();
1429 } else {
1430 // No synchronization necessary.
1431 #ifdef ASSERT
1432 { Label L;
1433 __ get_method(Z_R1_scratch);
1434 __ testbit(method2_(Z_R1_scratch, access_flags), JVM_ACC_SYNCHRONIZED_BIT);
1435 __ z_bfalse(L);
1436 reentry = __ stop_chain_static(reentry, "method needs synchronization");
1437 __ bind(L);
1438 }
1439 #endif // ASSERT
1440 }
1441
1442 // start execution
1443
1444 // jvmti support
1445 __ notify_method_entry();
1446
1447 //=============================================================================
1448 // Get and call the signature handler.
1449 const Register Rmethod = Z_tmp_2;
1450 const Register signature_handler_entry = Z_tmp_1;
1451 const Register Rresult_handler = Z_tmp_3;
1452 Label call_signature_handler;
1453
1454 assert_different_registers(Z_fp, Rmethod, signature_handler_entry, Rresult_handler);
1455 assert(Rresult_handler->is_nonvolatile(), "Rresult_handler must be in a non-volatile register");
1456
1457 // Reload method.
1458 __ get_method(Rmethod);
1459
1460 // Check for signature handler.
1461 __ load_and_test_long(signature_handler_entry, method2_(Rmethod, signature_handler));
1462 __ z_brne(call_signature_handler);
1463
1464 // Method has never been called. Either generate a specialized
1465 // handler or point to the slow one.
1466 __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::prepare_native_call),
1467 Rmethod);
1468
1469 // Reload method.
1470 __ get_method(Rmethod);
1471
1472 // Reload signature handler, it must have been created/assigned in the meantime.
1473 __ z_lg(signature_handler_entry, method2_(Rmethod, signature_handler));
1474
1475 __ bind(call_signature_handler);
1476
1477 // We have a TOP_IJAVA_FRAME here, which belongs to us.
1478 __ set_top_ijava_frame_at_SP_as_last_Java_frame(Z_SP, Z_R1/*tmp*/);
1479
1480 // Call signature handler and pass locals address in Z_ARG1.
1481 __ z_lgr(Z_ARG1, Z_locals);
1482 __ call_stub(signature_handler_entry);
1483 // Save result handler returned by signature handler.
1484 __ z_lgr(Rresult_handler, Z_RET);
1485
1486 // Reload method (the slow signature handler may block for GC).
1487 __ get_method(Rmethod);
1488
1489 // Pass mirror handle if static call.
1490 {
1491 Label method_is_not_static;
1492 __ testbit(method2_(Rmethod, access_flags), JVM_ACC_STATIC_BIT);
1493 __ z_bfalse(method_is_not_static);
1494 // Get mirror.
1495 __ load_mirror(Z_R1, Rmethod);
1496 // z_ijava_state.oop_temp = pool_holder->klass_part()->java_mirror();
1497 __ z_stg(Z_R1, oop_tmp_offset, Z_fp);
1498 // Pass handle to mirror as 2nd argument to JNI method.
1499 __ add2reg(Z_ARG2, oop_tmp_offset, Z_fp);
1500 __ bind(method_is_not_static);
1501 }
1502
1503 // Pass JNIEnv address as first parameter.
1504 __ add2reg(Z_ARG1, in_bytes(JavaThread::jni_environment_offset()), Z_thread);
1505
1506 // Note: last java frame has been set above already. The pc from there
1507 // is precise enough.
1508
1509 // Get native function entry point before we change the thread state.
1510 __ z_lg(Z_R1/*native_method_entry*/, method2_(Rmethod, native_function));
1511
1512 //=============================================================================
1513 // Transition from _thread_in_Java to _thread_in_native. As soon as
1514 // we make this change the safepoint code needs to be certain that
1515 // the last Java frame we established is good. The pc in that frame
1516 // just need to be near here not an actual return address.
1517 #ifdef ASSERT
1518 {
1519 NearLabel L;
1520 __ mem2reg_opt(Z_R14, Address(Z_thread, JavaThread::thread_state_offset()), false /*32 bits*/);
1521 __ compareU32_and_branch(Z_R14, _thread_in_Java, Assembler::bcondEqual, L);
1522 reentry = __ stop_chain_static(reentry, "Wrong thread state in native stub");
1523 __ bind(L);
1524 }
1525 #endif
1526
1527 // Memory ordering: Z does not reorder store/load with subsequent load. That's strong enough.
1528 __ set_thread_state(_thread_in_native);
1529
1530 //=============================================================================
1531 // Call the native method. Argument registers must not have been
1532 // overwritten since "__ call_stub(signature_handler);" (except for
1533 // ARG1 and ARG2 for static methods).
1534
1535 __ call_c(Z_R1/*native_method_entry*/);
1536
1537 // NOTE: frame::interpreter_frame_result() depends on these stores.
1538 __ z_stg(Z_RET, _z_ijava_state_neg(lresult), Z_fp);
1539 __ freg2mem_opt(Z_FRET, Address(Z_fp, _z_ijava_state_neg(fresult)));
1540 const Register Rlresult = signature_handler_entry;
1541 assert(Rlresult->is_nonvolatile(), "Rlresult must be in a non-volatile register");
1542 __ z_lgr(Rlresult, Z_RET);
1543
1544 // Z_method may no longer be valid, because of GC.
1545
1546 // Block, if necessary, before resuming in _thread_in_Java state.
1547 // In order for GC to work, don't clear the last_Java_sp until after
1548 // blocking.
1549
1550 //=============================================================================
1551 // Switch thread to "native transition" state before reading the
1552 // synchronization state. This additional state is necessary
1553 // because reading and testing the synchronization state is not
1554 // atomic w.r.t. GC, as this scenario demonstrates: Java thread A,
1555 // in _thread_in_native state, loads _not_synchronized and is
1556 // preempted. VM thread changes sync state to synchronizing and
1557 // suspends threads for GC. Thread A is resumed to finish this
1558 // native method, but doesn't block here since it didn't see any
1559 // synchronization is progress, and escapes.
1560
1561 __ set_thread_state(_thread_in_native_trans);
1562 if (UseMembar) {
1563 __ z_fence();
1564 } else {
1565 // Write serialization page so VM thread can do a pseudo remote
1566 // membar. We use the current thread pointer to calculate a thread
1567 // specific offset to write to within the page. This minimizes bus
1568 // traffic due to cache line collision.
1569 __ serialize_memory(Z_thread, Z_R1, Z_R0);
1570 }
1571 // Now before we return to java we must look for a current safepoint
1572 // (a new safepoint can not start since we entered native_trans).
1573 // We must check here because a current safepoint could be modifying
1574 // the callers registers right this moment.
1575
1576 // Check for safepoint operation in progress and/or pending suspend requests.
1577 {
1578 Label Continue, do_safepoint;
1579 __ generate_safepoint_check(do_safepoint, Z_R1, true);
1580 // Check for suspend.
1581 __ load_and_test_int(Z_R0/*suspend_flags*/, thread_(suspend_flags));
1582 __ z_bre(Continue); // 0 -> no flag set -> not suspended
1583 __ bind(do_safepoint);
1584 __ z_lgr(Z_ARG1, Z_thread);
1585 __ call_c(CAST_FROM_FN_PTR(address, JavaThread::check_special_condition_for_native_trans));
1586 __ bind(Continue);
1587 }
1588
1589 //=============================================================================
1590 // Back in Interpreter Frame.
1591
1592 // We are in thread_in_native_trans here and back in the normal
1593 // interpreter frame. We don't have to do anything special about
1594 // safepoints and we can switch to Java mode anytime we are ready.
1595
1596 // Note: frame::interpreter_frame_result has a dependency on how the
1597 // method result is saved across the call to post_method_exit. For
1598 // native methods it assumes that the non-FPU/non-void result is
1599 // saved in z_ijava_state.lresult and a FPU result in z_ijava_state.fresult. If
1600 // this changes then the interpreter_frame_result implementation
1601 // will need to be updated too.
1602
1603 //=============================================================================
1604 // Back in Java.
1605
1606 // Memory ordering: Z does not reorder store/load with subsequent
1607 // load. That's strong enough.
1608 __ set_thread_state(_thread_in_Java);
1609
1610 __ reset_last_Java_frame();
1611
1612 // We reset the JNI handle block only after unboxing the result; see below.
1613
1614 // The method register is junk from after the thread_in_native transition
1615 // until here. Also can't call_VM until the bcp has been
1616 // restored. Need bcp for throwing exception below so get it now.
1617 __ get_method(Rmethod);
1618
1619 // Restore Z_bcp to have legal interpreter frame,
1620 // i.e., bci == 0 <=> Z_bcp == code_base().
1621 __ z_lg(Z_bcp, Address(Rmethod, Method::const_offset())); // get constMethod
1622 __ add2reg(Z_bcp, in_bytes(ConstMethod::codes_offset())); // get codebase
1623
1624 if (CheckJNICalls) {
1625 // clear_pending_jni_exception_check
1626 __ clear_mem(Address(Z_thread, JavaThread::pending_jni_exception_check_fn_offset()), sizeof(oop));
1627 }
1628
1629 // Check if the native method returns an oop, and if so, move it
1630 // from the jni handle to z_ijava_state.oop_temp. This is
1631 // necessary, because we reset the jni handle block below.
1632 // NOTE: frame::interpreter_frame_result() depends on this, too.
1633 { NearLabel no_oop_result, store_oop_result;
1634 __ load_absolute_address(Z_R1, AbstractInterpreter::result_handler(T_OBJECT));
1635 __ compareU64_and_branch(Z_R1, Rresult_handler, Assembler::bcondNotEqual, no_oop_result);
1636 __ compareU64_and_branch(Rlresult, (intptr_t)0L, Assembler::bcondEqual, store_oop_result);
1637 __ z_lg(Rlresult, 0, Rlresult); // unbox
1638 __ bind(store_oop_result);
1639 __ z_stg(Rlresult, oop_tmp_offset, Z_fp);
1640 __ verify_oop(Rlresult);
1641 __ bind(no_oop_result);
1642 }
1643
1644 // Reset handle block.
1645 __ z_lg(Z_R1/*active_handles*/, thread_(active_handles));
1646 __ clear_mem(Address(Z_R1, JNIHandleBlock::top_offset_in_bytes()), 4);
1647
1648 // Bandle exceptions (exception handling will handle unlocking!).
1649 {
1650 Label L;
1651 __ load_and_test_long(Z_R0/*pending_exception*/, thread_(pending_exception));
1652 __ z_bre(L);
1653 __ MacroAssembler::call_VM(noreg,
1654 CAST_FROM_FN_PTR(address,
1655 InterpreterRuntime::throw_pending_exception));
1656 __ should_not_reach_here();
1657 __ bind(L);
1658 }
1659
1660 if (synchronized) {
1661 Register Rfirst_monitor = Z_ARG2;
1662 __ add2reg(Rfirst_monitor, -(frame::z_ijava_state_size + (int)sizeof(BasicObjectLock)), Z_fp);
1663 #ifdef ASSERT
1664 NearLabel ok;
1665 __ z_lg(Z_R1, _z_ijava_state_neg(monitors), Z_fp);
1666 __ compareU64_and_branch(Rfirst_monitor, Z_R1, Assembler::bcondEqual, ok);
1667 reentry = __ stop_chain_static(reentry, "native_entry:unlock: inconsistent z_ijava_state.monitors");
1668 __ bind(ok);
1669 #endif
1670 __ unlock_object(Rfirst_monitor);
1671 }
1672
1673 // JVMTI support. Result has already been saved above to the frame.
1674 __ notify_method_exit(true/*native_method*/, ilgl, InterpreterMacroAssembler::NotifyJVMTI);
1675
1676 // Move native method result back into proper registers and return.
1677 // C++ interpreter does not use result handler. So do we need to here? TODO(ZASM): check if correct.
1678 { NearLabel no_oop_or_null;
1679 __ mem2freg_opt(Z_FRET, Address(Z_fp, _z_ijava_state_neg(fresult)));
1680 __ load_and_test_long(Z_RET, Address(Z_fp, _z_ijava_state_neg(lresult)));
1681 __ z_bre(no_oop_or_null); // No unboxing if the result is NULL.
1682 __ load_absolute_address(Z_R1, AbstractInterpreter::result_handler(T_OBJECT));
1683 __ compareU64_and_branch(Z_R1, Rresult_handler, Assembler::bcondNotEqual, no_oop_or_null);
1684 __ z_lg(Z_RET, oop_tmp_offset, Z_fp);
1685 __ verify_oop(Z_RET);
1686 __ bind(no_oop_or_null);
1687 }
1688
1689 // Pop the native method's interpreter frame.
1690 __ pop_interpreter_frame(Z_R14 /*return_pc*/, Z_ARG2/*tmp1*/, Z_ARG3/*tmp2*/);
1691
1692 // Return to caller.
1693 __ z_br(Z_R14);
1694
1695 if (inc_counter) {
1696 // Handle overflow of counter and compile method.
1697 __ bind(invocation_counter_overflow);
1698 generate_counter_overflow(continue_after_compile);
1699 }
1700
1701 BLOCK_COMMENT("} native_entry");
1702
1703 return entry_point;
1704 }
1705
1706 //
1707 // Generic interpreted method entry to template interpreter.
1708 //
1709 address TemplateInterpreterGenerator::generate_normal_entry(bool synchronized) {
1710 address entry_point = __ pc();
1711
1712 bool inc_counter = UseCompiler || CountCompiledCalls || LogTouchedMethods;
1713
1714 // Interpreter entry for ordinary Java methods.
1715 //
1716 // Registers alive
1717 // Z_SP - stack pointer
1718 // Z_thread - JavaThread*
1719 // Z_method - callee's method (method to be invoked)
1720 // Z_esp - operand (or expression) stack pointer of caller. one slot above last arg.
1721 // Z_R10 - sender sp (before modifications, e.g. by c2i adapter
1722 // and as well by generate_fixed_frame below)
1723 // Z_R14 - return address to caller (call_stub or c2i_adapter)
1724 //
1725 // Registers updated
1726 // Z_SP - stack pointer
1727 // Z_fp - callee's framepointer
1728 // Z_esp - callee's operand stack pointer
1729 // points to the slot above the value on top
1730 // Z_locals - used to access locals: locals[i] := *(Z_locals - i*BytesPerWord)
1731 // Z_tos - integer result, if any
1732 // z_ftos - floating point result, if any
1733 //
1734 //
1735 // stack layout at this point:
1736 //
1737 // F1 [TOP_IJAVA_FRAME_ABI] <-- Z_SP, Z_R10 (Z_R10 will be below Z_SP if
1738 // frame was extended by c2i adapter)
1739 // [outgoing Java arguments] <-- Z_esp
1740 // ...
1741 // PARENT [PARENT_IJAVA_FRAME_ABI]
1742 // ...
1743 //
1744 // stack layout before dispatching the first bytecode:
1745 //
1746 // F0 [TOP_IJAVA_FRAME_ABI] <-- Z_SP
1747 // [operand stack] <-- Z_esp
1748 // monitor (optional, can grow)
1749 // [IJAVA_STATE]
1750 // F1 [PARENT_IJAVA_FRAME_ABI] <-- Z_fp (== *Z_SP)
1751 // [F0's locals] <-- Z_locals
1752 // [F1's operand stack]
1753 // [F1's monitors] (optional)
1754 // [IJAVA_STATE]
1755
1756 // Make sure registers are different!
1757 assert_different_registers(Z_thread, Z_method, Z_esp);
1758
1759 BLOCK_COMMENT("normal_entry {");
1760
1761 // Make sure method is not native and not abstract.
1762 // Rethink these assertions - they can be simplified and shared.
1763 #ifdef ASSERT
1764 address reentry = NULL;
1765 { Label L;
1766 __ testbit(method_(access_flags), JVM_ACC_NATIVE_BIT);
1767 __ z_bfalse(L);
1768 reentry = __ stop_chain_static(reentry, "tried to execute native method as non-native");
1769 __ bind(L);
1770 }
1771 { Label L;
1772 __ testbit(method_(access_flags), JVM_ACC_ABSTRACT_BIT);
1773 __ z_bfalse(L);
1774 reentry = __ stop_chain_static(reentry, "tried to execute abstract method as non-abstract");
1775 __ bind(L);
1776 }
1777 #endif // ASSERT
1778
1779 #ifdef ASSERT
1780 // Save the return PC into the callers frame for assertion in generate_fixed_frame.
1781 __ save_return_pc(Z_R14);
1782 #endif
1783
1784 // Generate the code to allocate the interpreter stack frame.
1785 generate_fixed_frame(false);
1786
1787 const Address do_not_unlock_if_synchronized(Z_thread, JavaThread::do_not_unlock_if_synchronized_offset());
1788 // Since at this point in the method invocation the exception handler
1789 // would try to exit the monitor of synchronized methods which hasn't
1790 // been entered yet, we set the thread local variable
1791 // _do_not_unlock_if_synchronized to true. If any exception was thrown by
1792 // runtime, exception handling i.e. unlock_if_synchronized_method will
1793 // check this thread local flag.
1794 __ z_mvi(do_not_unlock_if_synchronized, true);
1795
1796 __ profile_parameters_type(Z_tmp_2, Z_ARG3, Z_ARG4);
1797
1798 // Increment invocation counter and check for overflow.
1799 //
1800 // Note: checking for negative value instead of overflow so we have a 'sticky'
1801 // overflow test (may be of importance as soon as we have true MT/MP).
1802 NearLabel invocation_counter_overflow;
1803 NearLabel profile_method;
1804 NearLabel profile_method_continue;
1805 NearLabel Lcontinue;
1806 if (inc_counter) {
1807 generate_counter_incr(&invocation_counter_overflow, &profile_method, &profile_method_continue);
1808 if (ProfileInterpreter) {
1809 __ bind(profile_method_continue);
1810 }
1811 }
1812 __ bind(Lcontinue);
1813
1814 bang_stack_shadow_pages(false);
1815
1816 // Reset the _do_not_unlock_if_synchronized flag.
1817 __ z_mvi(do_not_unlock_if_synchronized, false);
1818
1819 // Check for synchronized methods.
1820 // Must happen AFTER invocation_counter check and stack overflow check,
1821 // so method is not locked if overflows.
1822 if (synchronized) {
1823 // Allocate monitor and lock method.
1824 lock_method();
1825 } else {
1826 #ifdef ASSERT
1827 { Label L;
1828 __ get_method(Z_R1_scratch);
1829 __ testbit(method2_(Z_R1_scratch, access_flags), JVM_ACC_SYNCHRONIZED_BIT);
1830 __ z_bfalse(L);
1831 reentry = __ stop_chain_static(reentry, "method needs synchronization");
1832 __ bind(L);
1833 }
1834 #endif // ASSERT
1835 }
1836
1837 // start execution
1838
1839 #ifdef ASSERT
1840 __ verify_esp(Z_esp, Z_R1_scratch);
1841
1842 __ verify_thread();
1843 #endif
1844
1845 // jvmti support
1846 __ notify_method_entry();
1847
1848 // Start executing instructions.
1849 __ dispatch_next(vtos);
1850 // Dispatch_next does not return.
1851 DEBUG_ONLY(__ should_not_reach_here());
1852
1853 // Invocation counter overflow.
1854 if (inc_counter) {
1855 if (ProfileInterpreter) {
1856 // We have decided to profile this method in the interpreter.
1857 __ bind(profile_method);
1858
1859 __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::profile_method));
1860 __ set_method_data_pointer_for_bcp();
1861 __ z_bru(profile_method_continue);
1862 }
1863
1864 // Handle invocation counter overflow.
1865 __ bind(invocation_counter_overflow);
1866 generate_counter_overflow(Lcontinue);
1867 }
1868
1869 BLOCK_COMMENT("} normal_entry");
1870
1871 return entry_point;
1872 }
1873
1874 // Method entry for static native methods:
1875 // int java.util.zip.CRC32.update(int crc, int b)
1876 address TemplateInterpreterGenerator::generate_CRC32_update_entry() {
1877
1878 if (UseCRC32Intrinsics) {
1879 uint64_t entry_off = __ offset();
1880 Label slow_path;
1881
1882 // If we need a safepoint check, generate full interpreter entry.
1883 __ generate_safepoint_check(slow_path, Z_R1, false);
1884
1885 BLOCK_COMMENT("CRC32_update {");
1886
1887 // We don't generate local frame and don't align stack because
1888 // we not even call stub code (we generate the code inline)
1889 // and there is no safepoint on this path.
1890
1891 // Load java parameters.
1892 // Z_esp is callers operand stack pointer, i.e. it points to the parameters.
1893 const Register argP = Z_esp;
1894 const Register crc = Z_ARG1; // crc value
1895 const Register data = Z_ARG2; // address of java byte value (kernel_crc32 needs address)
1896 const Register dataLen = Z_ARG3; // source data len (1 byte). Not used because calling the single-byte emitter.
1897 const Register table = Z_ARG4; // address of crc32 table
1898
1899 // Arguments are reversed on java expression stack.
1900 __ z_la(data, 3+1*wordSize, argP); // byte value (stack address).
1901 // Being passed as an int, the single byte is at offset +3.
1902 __ z_llgf(crc, 2 * wordSize, argP); // Current crc state, zero extend to 64 bit to have a clean register.
1903
1904 StubRoutines::zarch::generate_load_crc_table_addr(_masm, table);
1905 __ kernel_crc32_singleByte(crc, data, dataLen, table, Z_R1);
1906
1907 // Restore caller sp for c2i case.
1908 __ resize_frame_absolute(Z_R10, Z_R0, true); // Cut the stack back to where the caller started.
1909
1910 __ z_br(Z_R14);
1911
1912 BLOCK_COMMENT("} CRC32_update");
1913
1914 // Use a previously generated vanilla native entry as the slow path.
1915 BIND(slow_path);
1916 __ jump_to_entry(Interpreter::entry_for_kind(Interpreter::native), Z_R1);
1917 return __ addr_at(entry_off);
1918 }
1919
1920 return NULL;
1921 }
1922
1923
1924 // Method entry for static native methods:
1925 // int java.util.zip.CRC32.updateBytes(int crc, byte[] b, int off, int len)
1926 // int java.util.zip.CRC32.updateByteBuffer(int crc, long buf, int off, int len)
1927 address TemplateInterpreterGenerator::generate_CRC32_updateBytes_entry(AbstractInterpreter::MethodKind kind) {
1928
1929 if (UseCRC32Intrinsics) {
1930 uint64_t entry_off = __ offset();
1931 Label slow_path;
1932
1933 // If we need a safepoint check, generate full interpreter entry.
1934 __ generate_safepoint_check(slow_path, Z_R1, false);
1935
1936 // We don't generate local frame and don't align stack because
1937 // we call stub code and there is no safepoint on this path.
1938
1939 // Load parameters.
1940 // Z_esp is callers operand stack pointer, i.e. it points to the parameters.
1941 const Register argP = Z_esp;
1942 const Register crc = Z_ARG1; // crc value
1943 const Register data = Z_ARG2; // address of java byte array
1944 const Register dataLen = Z_ARG3; // source data len
1945 const Register table = Z_ARG4; // address of crc32 table
1946 const Register t0 = Z_R10; // work reg for kernel* emitters
1947 const Register t1 = Z_R11; // work reg for kernel* emitters
1948 const Register t2 = Z_R12; // work reg for kernel* emitters
1949 const Register t3 = Z_R13; // work reg for kernel* emitters
1950
1951 // Arguments are reversed on java expression stack.
1952 // Calculate address of start element.
1953 if (kind == Interpreter::java_util_zip_CRC32_updateByteBuffer) { // Used for "updateByteBuffer direct".
1954 // crc @ (SP + 5W) (32bit)
1955 // buf @ (SP + 3W) (64bit ptr to long array)
1956 // off @ (SP + 2W) (32bit)
1957 // dataLen @ (SP + 1W) (32bit)
1958 // data = buf + off
1959 BLOCK_COMMENT("CRC32_updateByteBuffer {");
1960 __ z_llgf(crc, 5*wordSize, argP); // current crc state
1961 __ z_lg(data, 3*wordSize, argP); // start of byte buffer
1962 __ z_agf(data, 2*wordSize, argP); // Add byte buffer offset.
1963 __ z_lgf(dataLen, 1*wordSize, argP); // #bytes to process
1964 } else { // Used for "updateBytes update".
1965 // crc @ (SP + 4W) (32bit)
1966 // buf @ (SP + 3W) (64bit ptr to byte array)
1967 // off @ (SP + 2W) (32bit)
1968 // dataLen @ (SP + 1W) (32bit)
1969 // data = buf + off + base_offset
1970 BLOCK_COMMENT("CRC32_updateBytes {");
1971 __ z_llgf(crc, 4*wordSize, argP); // current crc state
1972 __ z_lg(data, 3*wordSize, argP); // start of byte buffer
1973 __ z_agf(data, 2*wordSize, argP); // Add byte buffer offset.
1974 __ z_lgf(dataLen, 1*wordSize, argP); // #bytes to process
1975 __ z_aghi(data, arrayOopDesc::base_offset_in_bytes(T_BYTE));
1976 }
1977
1978 StubRoutines::zarch::generate_load_crc_table_addr(_masm, table);
1979
1980 __ resize_frame(-(6*8), Z_R0, true); // Resize frame to provide add'l space to spill 5 registers.
1981 __ z_stmg(t0, t3, 1*8, Z_SP); // Spill regs 10..13 to make them available as work registers.
1982 __ kernel_crc32_1word(crc, data, dataLen, table, t0, t1, t2, t3);
1983 __ z_lmg(t0, t3, 1*8, Z_SP); // Spill regs 10..13 back from stack.
1984
1985 // Restore caller sp for c2i case.
1986 __ resize_frame_absolute(Z_R10, Z_R0, true); // Cut the stack back to where the caller started.
1987
1988 __ z_br(Z_R14);
1989
1990 BLOCK_COMMENT("} CRC32_update{Bytes|ByteBuffer}");
1991
1992 // Use a previously generated vanilla native entry as the slow path.
1993 BIND(slow_path);
1994 __ jump_to_entry(Interpreter::entry_for_kind(Interpreter::native), Z_R1);
1995 return __ addr_at(entry_off);
1996 }
1997
1998 return NULL;
1999 }
2000
2001 // Not supported
2002 address TemplateInterpreterGenerator::generate_CRC32C_updateBytes_entry(AbstractInterpreter::MethodKind kind) {
2003 return NULL;
2004 }
2005
2006 void TemplateInterpreterGenerator::bang_stack_shadow_pages(bool native_call) {
2007 // Quick & dirty stack overflow checking: bang the stack & handle trap.
2008 // Note that we do the banging after the frame is setup, since the exception
2009 // handling code expects to find a valid interpreter frame on the stack.
2010 // Doing the banging earlier fails if the caller frame is not an interpreter
2011 // frame.
2012 // (Also, the exception throwing code expects to unlock any synchronized
2013 // method receiver, so do the banging after locking the receiver.)
2014
2015 // Bang each page in the shadow zone. We can't assume it's been done for
2016 // an interpreter frame with greater than a page of locals, so each page
2017 // needs to be checked. Only true for non-native. For native, we only bang the last page.
2018 if (UseStackBanging) {
2019 const int page_size = os::vm_page_size();
2020 const int n_shadow_pages = (int)(JavaThread::stack_shadow_zone_size()/page_size);
2021 const int start_page_num = native_call ? n_shadow_pages : 1;
2022 for (int pages = start_page_num; pages <= n_shadow_pages; pages++) {
2023 __ bang_stack_with_offset(pages*page_size);
2024 }
2025 }
2026 }
2027
2028 //-----------------------------------------------------------------------------
2029 // Exceptions
2030
2031 void TemplateInterpreterGenerator::generate_throw_exception() {
2032
2033 BLOCK_COMMENT("throw_exception {");
2034
2035 // Entry point in previous activation (i.e., if the caller was interpreted).
2036 Interpreter::_rethrow_exception_entry = __ pc();
2037 __ z_lg(Z_fp, _z_abi(callers_sp), Z_SP); // Frame accessors use Z_fp.
2038 // Z_ARG1 (==Z_tos): exception
2039 // Z_ARG2 : Return address/pc that threw exception.
2040 __ restore_bcp(); // R13 points to call/send.
2041 __ restore_locals();
2042
2043 // Fallthrough, no need to restore Z_esp.
2044
2045 // Entry point for exceptions thrown within interpreter code.
2046 Interpreter::_throw_exception_entry = __ pc();
2047 // Expression stack is undefined here.
2048 // Z_ARG1 (==Z_tos): exception
2049 // Z_bcp: exception bcp
2050 __ verify_oop(Z_ARG1);
2051 __ z_lgr(Z_ARG2, Z_ARG1);
2052
2053 // Expression stack must be empty before entering the VM in case of
2054 // an exception.
2055 __ empty_expression_stack();
2056 // Find exception handler address and preserve exception oop.
2057 const Register Rpreserved_exc_oop = Z_tmp_1;
2058 __ call_VM(Rpreserved_exc_oop,
2059 CAST_FROM_FN_PTR(address, InterpreterRuntime::exception_handler_for_exception),
2060 Z_ARG2);
2061 // Z_RET: exception handler entry point
2062 // Z_bcp: bcp for exception handler
2063 __ push_ptr(Rpreserved_exc_oop); // Push exception which is now the only value on the stack.
2064 __ z_br(Z_RET); // Jump to exception handler (may be _remove_activation_entry!).
2065
2066 // If the exception is not handled in the current frame the frame is
2067 // removed and the exception is rethrown (i.e. exception
2068 // continuation is _rethrow_exception).
2069 //
2070 // Note: At this point the bci is still the bci for the instruction
2071 // which caused the exception and the expression stack is
2072 // empty. Thus, for any VM calls at this point, GC will find a legal
2073 // oop map (with empty expression stack).
2074
2075 //
2076 // JVMTI PopFrame support
2077 //
2078
2079 Interpreter::_remove_activation_preserving_args_entry = __ pc();
2080 __ z_lg(Z_fp, _z_parent_ijava_frame_abi(callers_sp), Z_SP);
2081 __ empty_expression_stack();
2082 // Set the popframe_processing bit in pending_popframe_condition
2083 // indicating that we are currently handling popframe, so that
2084 // call_VMs that may happen later do not trigger new popframe
2085 // handling cycles.
2086 __ load_sized_value(Z_tmp_1, Address(Z_thread, JavaThread::popframe_condition_offset()), 4, false /*signed*/);
2087 __ z_oill(Z_tmp_1, JavaThread::popframe_processing_bit);
2088 __ z_sty(Z_tmp_1, thread_(popframe_condition));
2089
2090 {
2091 // Check to see whether we are returning to a deoptimized frame.
2092 // (The PopFrame call ensures that the caller of the popped frame is
2093 // either interpreted or compiled and deoptimizes it if compiled.)
2094 // In this case, we can't call dispatch_next() after the frame is
2095 // popped, but instead must save the incoming arguments and restore
2096 // them after deoptimization has occurred.
2097 //
2098 // Note that we don't compare the return PC against the
2099 // deoptimization blob's unpack entry because of the presence of
2100 // adapter frames in C2.
2101 NearLabel caller_not_deoptimized;
2102 __ z_lg(Z_ARG1, _z_parent_ijava_frame_abi(return_pc), Z_fp);
2103 __ call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::interpreter_contains), Z_ARG1);
2104 __ compareU64_and_branch(Z_RET, (intptr_t)0, Assembler::bcondNotEqual, caller_not_deoptimized);
2105
2106 // Compute size of arguments for saving when returning to
2107 // deoptimized caller.
2108 __ get_method(Z_ARG2);
2109 __ z_lg(Z_ARG2, Address(Z_ARG2, Method::const_offset()));
2110 __ z_llgh(Z_ARG2, Address(Z_ARG2, ConstMethod::size_of_parameters_offset()));
2111 __ z_sllg(Z_ARG2, Z_ARG2, Interpreter::logStackElementSize); // slots 2 bytes
2112 __ restore_locals();
2113 // Compute address of args to be saved.
2114 __ z_lgr(Z_ARG3, Z_locals);
2115 __ z_slgr(Z_ARG3, Z_ARG2);
2116 __ add2reg(Z_ARG3, wordSize);
2117 // Save these arguments.
2118 __ call_VM_leaf(CAST_FROM_FN_PTR(address, Deoptimization::popframe_preserve_args),
2119 Z_thread, Z_ARG2, Z_ARG3);
2120
2121 __ remove_activation(vtos, Z_R14,
2122 /* throw_monitor_exception */ false,
2123 /* install_monitor_exception */ false,
2124 /* notify_jvmdi */ false);
2125
2126 // Inform deoptimization that it is responsible for restoring
2127 // these arguments.
2128 __ store_const(thread_(popframe_condition),
2129 JavaThread::popframe_force_deopt_reexecution_bit,
2130 Z_tmp_1, false);
2131
2132 // Continue in deoptimization handler.
2133 __ z_br(Z_R14);
2134
2135 __ bind(caller_not_deoptimized);
2136 }
2137
2138 // Clear the popframe condition flag.
2139 __ clear_mem(thread_(popframe_condition), sizeof(int));
2140
2141 __ remove_activation(vtos,
2142 noreg, // Retaddr is not used.
2143 false, // throw_monitor_exception
2144 false, // install_monitor_exception
2145 false); // notify_jvmdi
2146 __ z_lg(Z_fp, _z_abi(callers_sp), Z_SP); // Restore frame pointer.
2147 __ restore_bcp();
2148 __ restore_locals();
2149 __ restore_esp();
2150 // The method data pointer was incremented already during
2151 // call profiling. We have to restore the mdp for the current bcp.
2152 if (ProfileInterpreter) {
2153 __ set_method_data_pointer_for_bcp();
2154 }
2155 #if INCLUDE_JVMTI
2156 {
2157 Label L_done;
2158
2159 __ z_cli(0, Z_bcp, Bytecodes::_invokestatic);
2160 __ z_brc(Assembler::bcondNotEqual, L_done);
2161
2162 // The member name argument must be restored if _invokestatic is
2163 // re-executed after a PopFrame call. Detect such a case in the
2164 // InterpreterRuntime function and return the member name
2165 // argument, or NULL.
2166 __ z_lg(Z_ARG2, Address(Z_locals));
2167 __ get_method(Z_ARG3);
2168 __ call_VM(Z_tmp_1,
2169 CAST_FROM_FN_PTR(address, InterpreterRuntime::member_name_arg_or_null),
2170 Z_ARG2, Z_ARG3, Z_bcp);
2171
2172 __ z_ltgr(Z_tmp_1, Z_tmp_1);
2173 __ z_brc(Assembler::bcondEqual, L_done);
2174
2175 __ z_stg(Z_tmp_1, Address(Z_esp, wordSize));
2176 __ bind(L_done);
2177 }
2178 #endif // INCLUDE_JVMTI
2179 __ dispatch_next(vtos);
2180 // End of PopFrame support.
2181 Interpreter::_remove_activation_entry = __ pc();
2182
2183 // In between activations - previous activation type unknown yet
2184 // compute continuation point - the continuation point expects the
2185 // following registers set up:
2186 //
2187 // Z_ARG1 (==Z_tos): exception
2188 // Z_ARG2 : return address/pc that threw exception
2189
2190 Register return_pc = Z_tmp_1;
2191 Register handler = Z_tmp_2;
2192 assert(return_pc->is_nonvolatile(), "use non-volatile reg. to preserve exception pc");
2193 assert(handler->is_nonvolatile(), "use non-volatile reg. to handler pc");
2194 __ asm_assert_ijava_state_magic(return_pc/*tmp*/); // The top frame should be an interpreter frame.
2195 __ z_lg(return_pc, _z_parent_ijava_frame_abi(return_pc), Z_fp);
2196
2197 // Moved removing the activation after VM call, because the new top
2198 // frame does not necessarily have the z_abi_160 required for a VM
2199 // call (e.g. if it is compiled).
2200
2201 __ super_call_VM_leaf(CAST_FROM_FN_PTR(address,
2202 SharedRuntime::exception_handler_for_return_address),
2203 Z_thread, return_pc);
2204 __ z_lgr(handler, Z_RET); // Save exception handler.
2205
2206 // Preserve exception over this code sequence.
2207 __ pop_ptr(Z_ARG1);
2208 __ set_vm_result(Z_ARG1);
2209 // Remove the activation (without doing throws on illegalMonitorExceptions).
2210 __ remove_activation(vtos, noreg/*ret.pc already loaded*/, false/*throw exc*/, true/*install exc*/, false/*notify jvmti*/);
2211 __ z_lg(Z_fp, _z_abi(callers_sp), Z_SP); // Restore frame pointer.
2212
2213 __ get_vm_result(Z_ARG1); // Restore exception.
2214 __ verify_oop(Z_ARG1);
2215 __ z_lgr(Z_ARG2, return_pc); // Restore return address.
2216
2217 #ifdef ASSERT
2218 // The return_pc in the new top frame is dead... at least that's my
2219 // current understanding. To assert this I overwrite it.
2220 // Note: for compiled frames the handler is the deopt blob
2221 // which writes Z_ARG2 into the return_pc slot.
2222 __ load_const_optimized(return_pc, 0xb00b1);
2223 __ z_stg(return_pc, _z_parent_ijava_frame_abi(return_pc), Z_SP);
2224 #endif
2225
2226 // Z_ARG1 (==Z_tos): exception
2227 // Z_ARG2 : return address/pc that threw exception
2228
2229 // Note that an "issuing PC" is actually the next PC after the call.
2230 __ z_br(handler); // Jump to exception handler of caller.
2231
2232 BLOCK_COMMENT("} throw_exception");
2233 }
2234
2235 //
2236 // JVMTI ForceEarlyReturn support
2237 //
2238 address TemplateInterpreterGenerator::generate_earlyret_entry_for (TosState state) {
2239 address entry = __ pc();
2240
2241 BLOCK_COMMENT("earlyret_entry {");
2242
2243 __ z_lg(Z_fp, _z_parent_ijava_frame_abi(callers_sp), Z_SP);
2244 __ restore_bcp();
2245 __ restore_locals();
2246 __ restore_esp();
2247 __ empty_expression_stack();
2248 __ load_earlyret_value(state);
2249
2250 Register RjvmtiState = Z_tmp_1;
2251 __ z_lg(RjvmtiState, thread_(jvmti_thread_state));
2252 __ store_const(Address(RjvmtiState, JvmtiThreadState::earlyret_state_offset()),
2253 JvmtiThreadState::earlyret_inactive, 4, 4, Z_R0_scratch);
2254
2255 __ remove_activation(state,
2256 Z_tmp_1, // retaddr
2257 false, // throw_monitor_exception
2258 false, // install_monitor_exception
2259 true); // notify_jvmdi
2260 __ z_br(Z_tmp_1);
2261
2262 BLOCK_COMMENT("} earlyret_entry");
2263
2264 return entry;
2265 }
2266
2267 //-----------------------------------------------------------------------------
2268 // Helper for vtos entry point generation.
2269
2270 void TemplateInterpreterGenerator::set_vtos_entry_points(Template* t,
2271 address& bep,
2272 address& cep,
2273 address& sep,
2274 address& aep,
2275 address& iep,
2276 address& lep,
2277 address& fep,
2278 address& dep,
2279 address& vep) {
2280 assert(t->is_valid() && t->tos_in() == vtos, "illegal template");
2281 Label L;
2282 aep = __ pc(); __ push_ptr(); __ z_bru(L);
2283 fep = __ pc(); __ push_f(); __ z_bru(L);
2284 dep = __ pc(); __ push_d(); __ z_bru(L);
2285 lep = __ pc(); __ push_l(); __ z_bru(L);
2286 bep = cep = sep =
2287 iep = __ pc(); __ push_i();
2288 vep = __ pc();
2289 __ bind(L);
2290 generate_and_dispatch(t);
2291 }
2292
2293 //-----------------------------------------------------------------------------
2294
2295 #ifndef PRODUCT
2296 address TemplateInterpreterGenerator::generate_trace_code(TosState state) {
2297 address entry = __ pc();
2298 NearLabel counter_below_trace_threshold;
2299
2300 if (TraceBytecodesAt > 0) {
2301 // Skip runtime call, if the trace threshold is not yet reached.
2302 __ load_absolute_address(Z_tmp_1, (address)&BytecodeCounter::_counter_value);
2303 __ load_absolute_address(Z_tmp_2, (address)&TraceBytecodesAt);
2304 __ load_sized_value(Z_tmp_1, Address(Z_tmp_1), 4, false /*signed*/);
2305 __ load_sized_value(Z_tmp_2, Address(Z_tmp_2), 8, false /*signed*/);
2306 __ compareU64_and_branch(Z_tmp_1, Z_tmp_2, Assembler::bcondLow, counter_below_trace_threshold);
2307 }
2308
2309 int offset2 = state == ltos || state == dtos ? 2 : 1;
2310
2311 __ push(state);
2312 // Preserved return pointer is in Z_R14.
2313 // InterpreterRuntime::trace_bytecode() preserved and returns the value passed as second argument.
2314 __ z_lgr(Z_ARG2, Z_R14);
2315 __ z_lg(Z_ARG3, Address(Z_esp, Interpreter::expr_offset_in_bytes(0)));
2316 if (WizardMode) {
2317 __ z_lgr(Z_ARG4, Z_esp); // Trace Z_esp in WizardMode.
2318 } else {
2319 __ z_lg(Z_ARG4, Address(Z_esp, Interpreter::expr_offset_in_bytes(offset2)));
2320 }
2321 __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::trace_bytecode), Z_ARG2, Z_ARG3, Z_ARG4);
2322 __ z_lgr(Z_R14, Z_RET); // Estore return address (see above).
2323 __ pop(state);
2324
2325 __ bind(counter_below_trace_threshold);
2326 __ z_br(Z_R14); // return
2327
2328 return entry;
2329 }
2330
2331 // Make feasible for old CPUs.
2332 void TemplateInterpreterGenerator::count_bytecode() {
2333 __ load_absolute_address(Z_R1_scratch, (address) &BytecodeCounter::_counter_value);
2334 __ add2mem_32(Address(Z_R1_scratch), 1, Z_R0_scratch);
2335 }
2336
2337 void TemplateInterpreterGenerator::histogram_bytecode(Template * t) {
2338 __ load_absolute_address(Z_R1_scratch, (address)&BytecodeHistogram::_counters[ t->bytecode() ]);
2339 __ add2mem_32(Address(Z_R1_scratch), 1, Z_tmp_1);
2340 }
2341
2342 void TemplateInterpreterGenerator::histogram_bytecode_pair(Template * t) {
2343 Address index_addr(Z_tmp_1, (intptr_t) 0);
2344 Register index = Z_tmp_2;
2345
2346 // Load previous index.
2347 __ load_absolute_address(Z_tmp_1, (address) &BytecodePairHistogram::_index);
2348 __ mem2reg_opt(index, index_addr, false);
2349
2350 // Mask with current bytecode and store as new previous index.
2351 __ z_srl(index, BytecodePairHistogram::log2_number_of_codes);
2352 __ load_const_optimized(Z_R0_scratch,
2353 (int)t->bytecode() << BytecodePairHistogram::log2_number_of_codes);
2354 __ z_or(index, Z_R0_scratch);
2355 __ reg2mem_opt(index, index_addr, false);
2356
2357 // Load counter array's address.
2358 __ z_lgfr(index, index); // Sign extend for addressing.
2359 __ z_sllg(index, index, LogBytesPerInt); // index2bytes
2360 __ load_absolute_address(Z_R1_scratch,
2361 (address) &BytecodePairHistogram::_counters);
2362 // Add index and increment counter.
2363 __ z_agr(Z_R1_scratch, index);
2364 __ add2mem_32(Address(Z_R1_scratch), 1, Z_tmp_1);
2365 }
2366
2367 void TemplateInterpreterGenerator::trace_bytecode(Template* t) {
2368 // Call a little run-time stub to avoid blow-up for each bytecode.
2369 // The run-time runtime saves the right registers, depending on
2370 // the tosca in-state for the given template.
2371 address entry = Interpreter::trace_code(t->tos_in());
2372 guarantee(entry != NULL, "entry must have been generated");
2373 __ call_stub(entry);
2374 }
2375
2376 void TemplateInterpreterGenerator::stop_interpreter_at() {
2377 NearLabel L;
2378
2379 __ load_absolute_address(Z_tmp_1, (address)&BytecodeCounter::_counter_value);
2380 __ load_absolute_address(Z_tmp_2, (address)&StopInterpreterAt);
2381 __ load_sized_value(Z_tmp_1, Address(Z_tmp_1), 4, false /*signed*/);
2382 __ load_sized_value(Z_tmp_2, Address(Z_tmp_2), 8, false /*signed*/);
2383 __ compareU64_and_branch(Z_tmp_1, Z_tmp_2, Assembler::bcondLow, L);
2384 assert(Z_tmp_1->is_nonvolatile(), "must be nonvolatile to preserve Z_tos");
2385 assert(Z_F8->is_nonvolatile(), "must be nonvolatile to preserve Z_ftos");
2386 __ z_lgr(Z_tmp_1, Z_tos); // Save tos.
2387 __ z_lgr(Z_tmp_2, Z_bytecode); // Save Z_bytecode.
2388 __ z_ldr(Z_F8, Z_ftos); // Save ftos.
2389 // Use -XX:StopInterpreterAt=<num> to set the limit
2390 // and break at breakpoint().
2391 __ call_VM(noreg, CAST_FROM_FN_PTR(address, breakpoint), false);
2392 __ z_lgr(Z_tos, Z_tmp_1); // Restore tos.
2393 __ z_lgr(Z_bytecode, Z_tmp_2); // Save Z_bytecode.
2394 __ z_ldr(Z_ftos, Z_F8); // Restore ftos.
2395 __ bind(L);
2396 }
2397
2398 #endif // !PRODUCT