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 address TemplateInterpreterGenerator::generate_return_entry_for (TosState state, int step, size_t index_size) {
646 address entry = __ pc();
647
648 BLOCK_COMMENT("return_entry {");
649
650 // Pop i2c extension or revert top-2-parent-resize done by interpreted callees.
651 Register sp_before_i2c_extension = Z_bcp;
652 __ z_lg(Z_fp, _z_abi(callers_sp), Z_SP); // Restore frame pointer.
653 __ z_lg(sp_before_i2c_extension, Address(Z_fp, _z_ijava_state_neg(top_frame_sp)));
654 __ resize_frame_absolute(sp_before_i2c_extension, Z_locals/*tmp*/, true/*load_fp*/);
655
656 // TODO(ZASM): necessary??
657 // // and NULL it as marker that esp is now tos until next java call
658 // __ movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), (int32_t)NULL_WORD);
659
660 __ restore_bcp();
661 __ restore_locals();
662 __ restore_esp();
663
664 if (state == atos) {
665 __ profile_return_type(Z_tmp_1, Z_tos, Z_tmp_2);
666 }
667
668 Register cache = Z_tmp_1;
669 Register size = Z_tmp_1;
670 Register offset = Z_tmp_2;
671 const int flags_offset = in_bytes(ConstantPoolCache::base_offset() +
672 ConstantPoolCacheEntry::flags_offset());
673 __ get_cache_and_index_at_bcp(cache, offset, 1, index_size);
674
675 // #args is in rightmost byte of the _flags field.
676 __ z_llgc(size, Address(cache, offset, flags_offset+(sizeof(size_t)-1)));
677 __ z_sllg(size, size, Interpreter::logStackElementSize); // Each argument size in bytes.
678 __ z_agr(Z_esp, size); // Pop arguments.
679 __ dispatch_next(state, step);
680
681 BLOCK_COMMENT("} return_entry");
682
683 return entry;
684 }
685
686 address TemplateInterpreterGenerator::generate_deopt_entry_for (TosState state,
687 int step) {
688 address entry = __ pc();
689
690 BLOCK_COMMENT("deopt_entry {");
691
692 // TODO(ZASM): necessary? NULL last_sp until next java call
693 // __ movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), (int32_t)NULL_WORD);
694 __ z_lg(Z_fp, _z_abi(callers_sp), Z_SP); // Restore frame pointer.
695 __ restore_bcp();
696 __ restore_locals();
697 __ restore_esp();
698
699 // Handle exceptions.
700 {
701 Label L;
702 __ load_and_test_long(Z_R0/*pending_exception*/, thread_(pending_exception));
703 __ z_bre(L);
704 __ call_VM(noreg,
705 CAST_FROM_FN_PTR(address,
706 InterpreterRuntime::throw_pending_exception));
707 __ should_not_reach_here();
708 __ bind(L);
709 }
710 __ dispatch_next(state, step);
711
712 BLOCK_COMMENT("} deopt_entry");
713
714 return entry;
715 }
716
717 address TemplateInterpreterGenerator::generate_safept_entry_for (TosState state,
718 address runtime_entry) {
719 address entry = __ pc();
720 __ push(state);
721 __ call_VM(noreg, runtime_entry);
722 __ dispatch_via(vtos, Interpreter::_normal_table.table_for (vtos));
723 return entry;
724 }
725
726 //
727 // Helpers for commoning out cases in the various type of method entries.
728 //
729
730 // Increment invocation count & check for overflow.
731 //
732 // Note: checking for negative value instead of overflow
733 // so we have a 'sticky' overflow test.
734 //
735 // Z_ARG2: method (see generate_fixed_frame())
736 //
737 void TemplateInterpreterGenerator::generate_counter_incr(Label* overflow, Label* profile_method, Label* profile_method_continue) {
738 Label done;
739 Register method = Z_ARG2; // Generate_fixed_frame() copies Z_method into Z_ARG2.
740 Register m_counters = Z_ARG4;
741
742 BLOCK_COMMENT("counter_incr {");
743
744 // Note: In tiered we increment either counters in method or in MDO depending
745 // if we are profiling or not.
746 if (TieredCompilation) {
747 int increment = InvocationCounter::count_increment;
748 if (ProfileInterpreter) {
749 NearLabel no_mdo;
750 Register mdo = m_counters;
751 // Are we profiling?
752 __ load_and_test_long(mdo, method2_(method, method_data));
753 __ branch_optimized(Assembler::bcondZero, no_mdo);
754 // Increment counter in the MDO.
755 const Address mdo_invocation_counter(mdo, MethodData::invocation_counter_offset() +
756 InvocationCounter::counter_offset());
757 const Address mask(mdo, MethodData::invoke_mask_offset());
758 __ increment_mask_and_jump(mdo_invocation_counter, increment, mask,
759 Z_R1_scratch, false, Assembler::bcondZero,
760 overflow);
761 __ z_bru(done);
762 __ bind(no_mdo);
763 }
764
765 // Increment counter in MethodCounters.
766 const Address invocation_counter(m_counters,
767 MethodCounters::invocation_counter_offset() +
768 InvocationCounter::counter_offset());
769 // Get address of MethodCounters object.
770 __ get_method_counters(method, m_counters, done);
771 const Address mask(m_counters, MethodCounters::invoke_mask_offset());
772 __ increment_mask_and_jump(invocation_counter,
773 increment, mask,
774 Z_R1_scratch, false, Assembler::bcondZero,
775 overflow);
776 } else {
777 Register counter_sum = Z_ARG3; // The result of this piece of code.
778 Register tmp = Z_R1_scratch;
779 #ifdef ASSERT
780 {
781 NearLabel ok;
782 __ get_method(tmp);
783 __ compare64_and_branch(method, tmp, Assembler::bcondEqual, ok);
784 __ z_illtrap(0x66);
785 __ bind(ok);
786 }
787 #endif
788
789 // Get address of MethodCounters object.
790 __ get_method_counters(method, m_counters, done);
791 // Update standard invocation counters.
792 __ increment_invocation_counter(m_counters, counter_sum);
793 if (ProfileInterpreter) {
794 __ add2mem_32(Address(m_counters, MethodCounters::interpreter_invocation_counter_offset()), 1, tmp);
795 if (profile_method != NULL) {
796 const Address profile_limit(m_counters, MethodCounters::interpreter_profile_limit_offset());
797 __ z_cl(counter_sum, profile_limit);
798 __ branch_optimized(Assembler::bcondLow, *profile_method_continue);
799 // If no method data exists, go to profile_method.
800 __ test_method_data_pointer(tmp, *profile_method);
801 }
802 }
803
804 const Address invocation_limit(m_counters, MethodCounters::interpreter_invocation_limit_offset());
805 __ z_cl(counter_sum, invocation_limit);
806 __ branch_optimized(Assembler::bcondNotLow, *overflow);
807 }
808
809 __ bind(done);
810
811 BLOCK_COMMENT("} counter_incr");
812 }
813
814 void TemplateInterpreterGenerator::generate_counter_overflow(Label& do_continue) {
815 // InterpreterRuntime::frequency_counter_overflow takes two
816 // arguments, the first (thread) is passed by call_VM, the second
817 // indicates if the counter overflow occurs at a backwards branch
818 // (NULL bcp). We pass zero for it. The call returns the address
819 // of the verified entry point for the method or NULL if the
820 // compilation did not complete (either went background or bailed
821 // out).
822 __ clear_reg(Z_ARG2);
823 __ call_VM(noreg,
824 CAST_FROM_FN_PTR(address, InterpreterRuntime::frequency_counter_overflow),
825 Z_ARG2);
826 __ z_bru(do_continue);
827 }
828
829 void TemplateInterpreterGenerator::generate_stack_overflow_check(Register frame_size, Register tmp1) {
830 Register tmp2 = Z_R1_scratch;
831 const int page_size = os::vm_page_size();
832 NearLabel after_frame_check;
833
834 BLOCK_COMMENT("counter_overflow {");
835
836 assert_different_registers(frame_size, tmp1);
837
838 // Stack banging is sufficient overflow check if frame_size < page_size.
839 if (Immediate::is_uimm(page_size, 15)) {
840 __ z_chi(frame_size, page_size);
841 __ z_brl(after_frame_check);
842 } else {
843 __ load_const_optimized(tmp1, page_size);
844 __ compareU32_and_branch(frame_size, tmp1, Assembler::bcondLow, after_frame_check);
845 }
846
847 // Get the stack base, and in debug, verify it is non-zero.
848 __ z_lg(tmp1, thread_(stack_base));
849 #ifdef ASSERT
850 address reentry = NULL;
851 NearLabel base_not_zero;
852 __ compareU64_and_branch(tmp1, (intptr_t)0L, Assembler::bcondNotEqual, base_not_zero);
853 reentry = __ stop_chain_static(reentry, "stack base is zero in generate_stack_overflow_check");
854 __ bind(base_not_zero);
855 #endif
856
857 // Get the stack size, and in debug, verify it is non-zero.
858 assert(sizeof(size_t) == sizeof(intptr_t), "wrong load size");
859 __ z_lg(tmp2, thread_(stack_size));
860 #ifdef ASSERT
861 NearLabel size_not_zero;
862 __ compareU64_and_branch(tmp2, (intptr_t)0L, Assembler::bcondNotEqual, size_not_zero);
863 reentry = __ stop_chain_static(reentry, "stack size is zero in generate_stack_overflow_check");
864 __ bind(size_not_zero);
865 #endif
866
867 // Compute the beginning of the protected zone minus the requested frame size.
868 __ z_sgr(tmp1, tmp2);
869 __ add2reg(tmp1, JavaThread::stack_guard_zone_size());
870
871 // Add in the size of the frame (which is the same as subtracting it from the
872 // SP, which would take another register.
873 __ z_agr(tmp1, frame_size);
874
875 // The frame is greater than one page in size, so check against
876 // the bottom of the stack.
877 __ compareU64_and_branch(Z_SP, tmp1, Assembler::bcondHigh, after_frame_check);
878
879 // The stack will overflow, throw an exception.
880
881 // Restore SP to sender's sp. This is necessary if the sender's frame is an
882 // extended compiled frame (see gen_c2i_adapter()) and safer anyway in case of
883 // JSR292 adaptations.
884 __ resize_frame_absolute(Z_R10, tmp1, true/*load_fp*/);
885
886 // Note also that the restored frame is not necessarily interpreted.
887 // Use the shared runtime version of the StackOverflowError.
888 assert(StubRoutines::throw_StackOverflowError_entry() != NULL, "stub not yet generated");
889 AddressLiteral stub(StubRoutines::throw_StackOverflowError_entry());
890 __ load_absolute_address(tmp1, StubRoutines::throw_StackOverflowError_entry());
891 __ z_br(tmp1);
892
893 // If you get to here, then there is enough stack space.
894 __ bind(after_frame_check);
895
896 BLOCK_COMMENT("} counter_overflow");
897 }
898
899 // Allocate monitor and lock method (asm interpreter).
900 //
901 // Args:
902 // Z_locals: locals
903
904 void TemplateInterpreterGenerator::lock_method(void) {
905
906 BLOCK_COMMENT("lock_method {");
907
908 // Synchronize method.
909 const Register method = Z_tmp_2;
910 __ get_method(method);
911
912 #ifdef ASSERT
913 address reentry = NULL;
914 {
915 Label L;
916 __ testbit(method2_(method, access_flags), JVM_ACC_SYNCHRONIZED_BIT);
917 __ z_btrue(L);
918 reentry = __ stop_chain_static(reentry, "method doesn't need synchronization");
919 __ bind(L);
920 }
921 #endif // ASSERT
922
923 // Get synchronization object.
924 const Register object = Z_tmp_2;
925
926 {
927 Label done;
928 Label static_method;
929
930 __ testbit(method2_(method, access_flags), JVM_ACC_STATIC_BIT);
931 __ z_btrue(static_method);
932
933 // non-static method: Load receiver obj from stack.
934 __ mem2reg_opt(object, Address(Z_locals, Interpreter::local_offset_in_bytes(0)));
935 __ z_bru(done);
936
937 __ bind(static_method);
938
939 // Lock the java mirror.
940 __ load_mirror(object, method);
941 #ifdef ASSERT
942 {
943 NearLabel L;
944 __ compare64_and_branch(object, (intptr_t) 0, Assembler::bcondNotEqual, L);
945 reentry = __ stop_chain_static(reentry, "synchronization object is NULL");
946 __ bind(L);
947 }
948 #endif // ASSERT
949
950 __ bind(done);
951 }
952
953 __ add_monitor_to_stack(true, Z_ARG3, Z_ARG4, Z_ARG5); // Allocate monitor elem.
954 // Store object and lock it.
955 __ get_monitors(Z_tmp_1);
956 __ reg2mem_opt(object, Address(Z_tmp_1, BasicObjectLock::obj_offset_in_bytes()));
957 __ lock_object(Z_tmp_1, object);
958
959 BLOCK_COMMENT("} lock_method");
960 }
961
962 // Generate a fixed interpreter frame. This is identical setup for
963 // interpreted methods and for native methods hence the shared code.
964 //
965 // Registers alive
966 // Z_thread - JavaThread*
967 // Z_SP - old stack pointer
968 // Z_method - callee's method
969 // Z_esp - parameter list (slot 'above' last param)
970 // Z_R14 - return pc, to be stored in caller's frame
971 // Z_R10 - sender sp, note: Z_tmp_1 is Z_R10!
972 //
973 // Registers updated
974 // Z_SP - new stack pointer
975 // Z_esp - callee's operand stack pointer
976 // points to the slot above the value on top
977 // Z_locals - used to access locals: locals[i] := *(Z_locals - i*BytesPerWord)
978 // Z_bcp - the bytecode pointer
979 // Z_fp - the frame pointer, thereby killing Z_method
980 // Z_ARG2 - copy of Z_method
981 //
982 void TemplateInterpreterGenerator::generate_fixed_frame(bool native_call) {
983
984 // stack layout
985 //
986 // F1 [TOP_IJAVA_FRAME_ABI] <-- Z_SP, Z_R10 (see note below)
987 // [F1's operand stack (unused)]
988 // [F1's outgoing Java arguments] <-- Z_esp
989 // [F1's operand stack (non args)]
990 // [monitors] (optional)
991 // [IJAVA_STATE]
992 //
993 // F2 [PARENT_IJAVA_FRAME_ABI]
994 // ...
995 //
996 // 0x000
997 //
998 // Note: Z_R10, the sender sp, will be below Z_SP if F1 was extended by a c2i adapter.
999
1000 //=============================================================================
1001 // Allocate space for locals other than the parameters, the
1002 // interpreter state, monitors, and the expression stack.
1003
1004 const Register local_count = Z_ARG5;
1005 const Register fp = Z_tmp_2;
1006
1007 BLOCK_COMMENT("generate_fixed_frame {");
1008
1009 {
1010 // local registers
1011 const Register top_frame_size = Z_ARG2;
1012 const Register sp_after_resize = Z_ARG3;
1013 const Register max_stack = Z_ARG4;
1014
1015 // local_count = method->constMethod->max_locals();
1016 __ z_lg(Z_R1_scratch, Address(Z_method, Method::const_offset()));
1017 __ z_llgh(local_count, Address(Z_R1_scratch, ConstMethod::size_of_locals_offset()));
1018
1019 if (native_call) {
1020 // If we're calling a native method, we replace max_stack (which is
1021 // zero) with space for the worst-case signature handler varargs
1022 // vector, which is:
1023 // max_stack = max(Argument::n_register_parameters, parameter_count+2);
1024 //
1025 // We add two slots to the parameter_count, one for the jni
1026 // environment and one for a possible native mirror. We allocate
1027 // space for at least the number of ABI registers, even though
1028 // InterpreterRuntime::slow_signature_handler won't write more than
1029 // parameter_count+2 words when it creates the varargs vector at the
1030 // top of the stack. The generated slow signature handler will just
1031 // load trash into registers beyond the necessary number. We're
1032 // still going to cut the stack back by the ABI register parameter
1033 // count so as to get SP+16 pointing at the ABI outgoing parameter
1034 // area, so we need to allocate at least that much even though we're
1035 // going to throw it away.
1036 //
1037
1038 __ z_lg(Z_R1_scratch, Address(Z_method, Method::const_offset()));
1039 __ z_llgh(max_stack, Address(Z_R1_scratch, ConstMethod::size_of_parameters_offset()));
1040 __ add2reg(max_stack, 2);
1041
1042 NearLabel passing_args_on_stack;
1043
1044 // max_stack in bytes
1045 __ z_sllg(max_stack, max_stack, LogBytesPerWord);
1046
1047 int argument_registers_in_bytes = Argument::n_register_parameters << LogBytesPerWord;
1048 __ compare64_and_branch(max_stack, argument_registers_in_bytes, Assembler::bcondNotLow, passing_args_on_stack);
1049
1050 __ load_const_optimized(max_stack, argument_registers_in_bytes);
1051
1052 __ bind(passing_args_on_stack);
1053 } else {
1054 // !native_call
1055 __ z_lg(max_stack, method_(const));
1056
1057 // Calculate number of non-parameter locals (in slots):
1058 __ z_lg(Z_R1_scratch, Address(Z_method, Method::const_offset()));
1059 __ z_sh(local_count, Address(Z_R1_scratch, ConstMethod::size_of_parameters_offset()));
1060
1061 // max_stack = method->max_stack();
1062 __ z_llgh(max_stack, Address(max_stack, ConstMethod::max_stack_offset()));
1063 // max_stack in bytes
1064 __ z_sllg(max_stack, max_stack, LogBytesPerWord);
1065 }
1066
1067 // Resize (i.e. normally shrink) the top frame F1 ...
1068 // F1 [TOP_IJAVA_FRAME_ABI] <-- Z_SP, Z_R10
1069 // F1's operand stack (free)
1070 // ...
1071 // F1's operand stack (free) <-- Z_esp
1072 // F1's outgoing Java arg m
1073 // ...
1074 // F1's outgoing Java arg 0
1075 // ...
1076 //
1077 // ... into a parent frame (Z_R10 holds F1's SP before any modification, see also above)
1078 //
1079 // +......................+
1080 // : : <-- Z_R10, saved below as F0's z_ijava_state.sender_sp
1081 // : :
1082 // F1 [PARENT_IJAVA_FRAME_ABI] <-- Z_SP \
1083 // F0's non arg local | = delta
1084 // ... |
1085 // F0's non arg local <-- Z_esp /
1086 // F1's outgoing Java arg m
1087 // ...
1088 // F1's outgoing Java arg 0
1089 // ...
1090 //
1091 // then push the new top frame F0.
1092 //
1093 // F0 [TOP_IJAVA_FRAME_ABI] = frame::z_top_ijava_frame_abi_size \
1094 // [operand stack] = max_stack | = top_frame_size
1095 // [IJAVA_STATE] = frame::z_ijava_state_size /
1096
1097 // sp_after_resize = Z_esp - delta
1098 //
1099 // delta = PARENT_IJAVA_FRAME_ABI + (locals_count - params_count)
1100
1101 __ add2reg(sp_after_resize, (Interpreter::stackElementSize) - (frame::z_parent_ijava_frame_abi_size), Z_esp);
1102 __ z_sllg(Z_R0_scratch, local_count, LogBytesPerWord); // Params have already been subtracted from local_count.
1103 __ z_slgr(sp_after_resize, Z_R0_scratch);
1104
1105 // top_frame_size = TOP_IJAVA_FRAME_ABI + max_stack + size of interpreter state
1106 __ add2reg(top_frame_size,
1107 frame::z_top_ijava_frame_abi_size +
1108 frame::z_ijava_state_size +
1109 frame::interpreter_frame_monitor_size() * wordSize,
1110 max_stack);
1111
1112 // Check if there's room for the new frame...
1113 Register frame_size = max_stack; // Reuse the regiser for max_stack.
1114 __ z_lgr(frame_size, Z_SP);
1115 __ z_sgr(frame_size, sp_after_resize);
1116 __ z_agr(frame_size, top_frame_size);
1117 generate_stack_overflow_check(frame_size, fp/*tmp1*/);
1118
1119 DEBUG_ONLY(__ z_cg(Z_R14, _z_abi16(return_pc), Z_SP));
1120 __ asm_assert_eq("killed Z_R14", 0);
1121 __ resize_frame_absolute(sp_after_resize, fp, true);
1122 __ save_return_pc(Z_R14);
1123
1124 // ... and push the new frame F0.
1125 __ push_frame(top_frame_size, fp, true /*copy_sp*/, false);
1126 }
1127
1128 //=============================================================================
1129 // Initialize the new frame F0: initialize interpreter state.
1130
1131 {
1132 // locals
1133 const Register local_addr = Z_ARG4;
1134
1135 BLOCK_COMMENT("generate_fixed_frame: initialize interpreter state {");
1136
1137 #ifdef ASSERT
1138 // Set the magic number (using local_addr as tmp register).
1139 __ load_const_optimized(local_addr, frame::z_istate_magic_number);
1140 __ z_stg(local_addr, _z_ijava_state_neg(magic), fp);
1141 #endif
1142
1143 // Save sender SP from F1 (i.e. before it was potentially modified by an
1144 // adapter) into F0's interpreter state. We us it as well to revert
1145 // resizing the frame above.
1146 __ z_stg(Z_R10, _z_ijava_state_neg(sender_sp), fp);
1147
1148 // Load cp cache and save it at the and of this block.
1149 __ z_lg(Z_R1_scratch, Address(Z_method, Method::const_offset()));
1150 __ z_lg(Z_R1_scratch, Address(Z_R1_scratch, ConstMethod::constants_offset()));
1151 __ z_lg(Z_R1_scratch, Address(Z_R1_scratch, ConstantPool::cache_offset_in_bytes()));
1152
1153 // z_ijava_state->method = method;
1154 __ z_stg(Z_method, _z_ijava_state_neg(method), fp);
1155
1156 // Point locals at the first argument. Method's locals are the
1157 // parameters on top of caller's expression stack.
1158 // Tos points past last Java argument.
1159
1160 __ z_lg(Z_locals, Address(Z_method, Method::const_offset()));
1161 __ z_llgh(Z_locals /*parameter_count words*/,
1162 Address(Z_locals, ConstMethod::size_of_parameters_offset()));
1163 __ z_sllg(Z_locals /*parameter_count bytes*/, Z_locals /*parameter_count*/, LogBytesPerWord);
1164 __ z_agr(Z_locals, Z_esp);
1165 // z_ijava_state->locals - i*BytesPerWord points to i-th Java local (i starts at 0)
1166 // z_ijava_state->locals = Z_esp + parameter_count bytes
1167 __ z_stg(Z_locals, _z_ijava_state_neg(locals), fp);
1168
1169 // z_ijava_state->oop_temp = NULL;
1170 __ store_const(Address(fp, oop_tmp_offset), 0);
1171
1172 // Initialize z_ijava_state->mdx.
1173 Register Rmdp = Z_bcp;
1174 // native_call: assert that mdo == NULL
1175 const bool check_for_mdo = !native_call DEBUG_ONLY(|| native_call);
1176 if (ProfileInterpreter && check_for_mdo) {
1177 #ifdef FAST_DISPATCH
1178 // FAST_DISPATCH and ProfileInterpreter are mutually exclusive since
1179 // they both use I2.
1180 assert(0, "FAST_DISPATCH and +ProfileInterpreter are mutually exclusive");
1181 #endif // FAST_DISPATCH
1182 Label get_continue;
1183
1184 __ load_and_test_long(Rmdp, method_(method_data));
1185 __ z_brz(get_continue);
1186 DEBUG_ONLY(if (native_call) __ stop("native methods don't have a mdo"));
1187 __ add2reg(Rmdp, in_bytes(MethodData::data_offset()));
1188 __ bind(get_continue);
1189 }
1190 __ z_stg(Rmdp, _z_ijava_state_neg(mdx), fp);
1191
1192 // Initialize z_ijava_state->bcp and Z_bcp.
1193 if (native_call) {
1194 __ clear_reg(Z_bcp); // Must initialize. Will get written into frame where GC reads it.
1195 } else {
1196 __ z_lg(Z_bcp, method_(const));
1197 __ add2reg(Z_bcp, in_bytes(ConstMethod::codes_offset()));
1198 }
1199 __ z_stg(Z_bcp, _z_ijava_state_neg(bcp), fp);
1200
1201 // no monitors and empty operand stack
1202 // => z_ijava_state->monitors points to the top slot in IJAVA_STATE.
1203 // => Z_ijava_state->esp points one slot above into the operand stack.
1204 // z_ijava_state->monitors = fp - frame::z_ijava_state_size - Interpreter::stackElementSize;
1205 // z_ijava_state->esp = Z_esp = z_ijava_state->monitors;
1206 __ add2reg(Z_esp, -frame::z_ijava_state_size, fp);
1207 __ z_stg(Z_esp, _z_ijava_state_neg(monitors), fp);
1208 __ add2reg(Z_esp, -Interpreter::stackElementSize);
1209 __ z_stg(Z_esp, _z_ijava_state_neg(esp), fp);
1210
1211 // z_ijava_state->cpoolCache = Z_R1_scratch (see load above);
1212 __ z_stg(Z_R1_scratch, _z_ijava_state_neg(cpoolCache), fp);
1213
1214 // Get mirror and store it in the frame as GC root for this Method*.
1215 __ load_mirror(Z_R1_scratch, Z_method);
1216 __ z_stg(Z_R1_scratch, _z_ijava_state_neg(mirror), fp);
1217
1218 BLOCK_COMMENT("} generate_fixed_frame: initialize interpreter state");
1219
1220 //=============================================================================
1221 if (!native_call) {
1222 // Fill locals with 0x0s.
1223 NearLabel locals_zeroed;
1224 NearLabel doXC;
1225
1226 // Local_count is already num_locals_slots - num_param_slots.
1227 __ compare64_and_branch(local_count, (intptr_t)0L, Assembler::bcondNotHigh, locals_zeroed);
1228
1229 // Advance local_addr to point behind locals (creates positive incr. in loop).
1230 __ z_lg(Z_R1_scratch, Address(Z_method, Method::const_offset()));
1231 __ z_llgh(Z_R0_scratch,
1232 Address(Z_R1_scratch, ConstMethod::size_of_locals_offset()));
1233 if (Z_R0_scratch == Z_R0) {
1234 __ z_aghi(Z_R0_scratch, -1);
1235 } else {
1236 __ add2reg(Z_R0_scratch, -1);
1237 }
1238 __ z_lgr(local_addr/*locals*/, Z_locals);
1239 __ z_sllg(Z_R0_scratch, Z_R0_scratch, LogBytesPerWord);
1240 __ z_sllg(local_count, local_count, LogBytesPerWord); // Local_count are non param locals.
1241 __ z_sgr(local_addr, Z_R0_scratch);
1242
1243 if (VM_Version::has_Prefetch()) {
1244 __ z_pfd(0x02, 0, Z_R0, local_addr);
1245 __ z_pfd(0x02, 256, Z_R0, local_addr);
1246 }
1247
1248 // Can't optimise for Z10 using "compare and branch" (immediate value is too big).
1249 __ z_cghi(local_count, 256);
1250 __ z_brnh(doXC);
1251
1252 // MVCLE: Initialize if quite a lot locals.
1253 // __ bind(doMVCLE);
1254 __ z_lgr(Z_R0_scratch, local_addr);
1255 __ z_lgr(Z_R1_scratch, local_count);
1256 __ clear_reg(Z_ARG2); // Src len of MVCLE is zero.
1257
1258 __ MacroAssembler::move_long_ext(Z_R0_scratch, Z_ARG1, 0);
1259 __ z_bru(locals_zeroed);
1260
1261 Label XC_template;
1262 __ bind(XC_template);
1263 __ z_xc(0, 0, local_addr, 0, local_addr);
1264
1265 __ bind(doXC);
1266 __ z_bctgr(local_count, Z_R0); // Get #bytes-1 for EXECUTE.
1267 if (VM_Version::has_ExecuteExtensions()) {
1268 __ z_exrl(local_count, XC_template); // Execute XC with variable length.
1269 } else {
1270 __ z_larl(Z_R1_scratch, XC_template);
1271 __ z_ex(local_count, 0, Z_R0, Z_R1_scratch); // Execute XC with variable length.
1272 }
1273
1274 __ bind(locals_zeroed);
1275 }
1276
1277 }
1278 // Finally set the frame pointer, destroying Z_method.
1279 assert(Z_fp == Z_method, "maybe set Z_fp earlier if other register than Z_method");
1280 // Oprofile analysis suggests to keep a copy in a register to be used by
1281 // generate_counter_incr().
1282 __ z_lgr(Z_ARG2, Z_method);
1283 __ z_lgr(Z_fp, fp);
1284
1285 BLOCK_COMMENT("} generate_fixed_frame");
1286 }
1287
1288 // Various method entries
1289
1290 // Math function, frame manager must set up an interpreter state, etc.
1291 address TemplateInterpreterGenerator::generate_math_entry(AbstractInterpreter::MethodKind kind) {
1292
1293 if (!InlineIntrinsics) { return NULL; } // Generate a vanilla entry.
1294
1295 // Only support absolute value and square root.
1296 if (kind != Interpreter::java_lang_math_abs && kind != Interpreter::java_lang_math_sqrt) {
1297 return NULL;
1298 }
1299
1300 BLOCK_COMMENT("math_entry {");
1301
1302 address math_entry = __ pc();
1303
1304 if (kind == Interpreter::java_lang_math_abs) {
1305 // Load operand from stack.
1306 __ mem2freg_opt(Z_FRET, Address(Z_esp, Interpreter::stackElementSize));
1307 __ z_lpdbr(Z_FRET);
1308 } else {
1309 // sqrt
1310 // Can use memory operand directly.
1311 __ z_sqdb(Z_FRET, Interpreter::stackElementSize, Z_esp);
1312 }
1313
1314 // Restore caller sp for c2i case.
1315 __ resize_frame_absolute(Z_R10, Z_R0, true); // Cut the stack back to where the caller started.
1316
1317 // We are done, return.
1318 __ z_br(Z_R14);
1319
1320 BLOCK_COMMENT("} math_entry");
1321
1322 return math_entry;
1323 }
1324
1325 // Interpreter stub for calling a native method. (asm interpreter).
1326 // This sets up a somewhat different looking stack for calling the
1327 // native method than the typical interpreter frame setup.
1328 address TemplateInterpreterGenerator::generate_native_entry(bool synchronized) {
1329 // Determine code generation flags.
1330 bool inc_counter = UseCompiler || CountCompiledCalls || LogTouchedMethods;
1331
1332 // Interpreter entry for ordinary Java methods.
1333 //
1334 // Registers alive
1335 // Z_SP - stack pointer
1336 // Z_thread - JavaThread*
1337 // Z_method - callee's method (method to be invoked)
1338 // Z_esp - operand (or expression) stack pointer of caller. one slot above last arg.
1339 // Z_R10 - sender sp (before modifications, e.g. by c2i adapter
1340 // and as well by generate_fixed_frame below)
1341 // Z_R14 - return address to caller (call_stub or c2i_adapter)
1342 //
1343 // Registers updated
1344 // Z_SP - stack pointer
1345 // Z_fp - callee's framepointer
1346 // Z_esp - callee's operand stack pointer
1347 // points to the slot above the value on top
1348 // Z_locals - used to access locals: locals[i] := *(Z_locals - i*BytesPerWord)
1349 // Z_tos - integer result, if any
1350 // z_ftos - floating point result, if any
1351 //
1352 // Stack layout at this point:
1353 //
1354 // F1 [TOP_IJAVA_FRAME_ABI] <-- Z_SP, Z_R10 (Z_R10 will be below Z_SP if
1355 // frame was extended by c2i adapter)
1356 // [outgoing Java arguments] <-- Z_esp
1357 // ...
1358 // PARENT [PARENT_IJAVA_FRAME_ABI]
1359 // ...
1360 //
1361
1362 address entry_point = __ pc();
1363
1364 // Make sure registers are different!
1365 assert_different_registers(Z_thread, Z_method, Z_esp);
1366
1367 BLOCK_COMMENT("native_entry {");
1368
1369 // Make sure method is native and not abstract.
1370 #ifdef ASSERT
1371 address reentry = NULL;
1372 { Label L;
1373 __ testbit(method_(access_flags), JVM_ACC_NATIVE_BIT);
1374 __ z_btrue(L);
1375 reentry = __ stop_chain_static(reentry, "tried to execute non-native method as native");
1376 __ bind(L);
1377 }
1378 { Label L;
1379 __ testbit(method_(access_flags), JVM_ACC_ABSTRACT_BIT);
1380 __ z_bfalse(L);
1381 reentry = __ stop_chain_static(reentry, "tried to execute abstract method as non-abstract");
1382 __ bind(L);
1383 }
1384 #endif // ASSERT
1385
1386 #ifdef ASSERT
1387 // Save the return PC into the callers frame for assertion in generate_fixed_frame.
1388 __ save_return_pc(Z_R14);
1389 #endif
1390
1391 // Generate the code to allocate the interpreter stack frame.
1392 generate_fixed_frame(true);
1393
1394 const Address do_not_unlock_if_synchronized(Z_thread, JavaThread::do_not_unlock_if_synchronized_offset());
1395 // Since at this point in the method invocation the exception handler
1396 // would try to exit the monitor of synchronized methods which hasn't
1397 // been entered yet, we set the thread local variable
1398 // _do_not_unlock_if_synchronized to true. If any exception was thrown by
1399 // runtime, exception handling i.e. unlock_if_synchronized_method will
1400 // check this thread local flag.
1401 __ z_mvi(do_not_unlock_if_synchronized, true);
1402
1403 // Increment invocation count and check for overflow.
1404 NearLabel invocation_counter_overflow;
1405 if (inc_counter) {
1406 generate_counter_incr(&invocation_counter_overflow, NULL, NULL);
1407 }
1408
1409 Label continue_after_compile;
1410 __ bind(continue_after_compile);
1411
1412 bang_stack_shadow_pages(true);
1413
1414 // Reset the _do_not_unlock_if_synchronized flag.
1415 __ z_mvi(do_not_unlock_if_synchronized, false);
1416
1417 // Check for synchronized methods.
1418 // This mst happen AFTER invocation_counter check and stack overflow check,
1419 // so method is not locked if overflows.
1420 if (synchronized) {
1421 lock_method();
1422 } else {
1423 // No synchronization necessary.
1424 #ifdef ASSERT
1425 { Label L;
1426 __ get_method(Z_R1_scratch);
1427 __ testbit(method2_(Z_R1_scratch, access_flags), JVM_ACC_SYNCHRONIZED_BIT);
1428 __ z_bfalse(L);
1429 reentry = __ stop_chain_static(reentry, "method needs synchronization");
1430 __ bind(L);
1431 }
1432 #endif // ASSERT
1433 }
1434
1435 // start execution
1436
1437 // jvmti support
1438 __ notify_method_entry();
1439
1440 //=============================================================================
1441 // Get and call the signature handler.
1442 const Register Rmethod = Z_tmp_2;
1443 const Register signature_handler_entry = Z_tmp_1;
1444 const Register Rresult_handler = Z_tmp_3;
1445 Label call_signature_handler;
1446
1447 assert_different_registers(Z_fp, Rmethod, signature_handler_entry, Rresult_handler);
1448 assert(Rresult_handler->is_nonvolatile(), "Rresult_handler must be in a non-volatile register");
1449
1450 // Reload method.
1451 __ get_method(Rmethod);
1452
1453 // Check for signature handler.
1454 __ load_and_test_long(signature_handler_entry, method2_(Rmethod, signature_handler));
1455 __ z_brne(call_signature_handler);
1456
1457 // Method has never been called. Either generate a specialized
1458 // handler or point to the slow one.
1459 __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::prepare_native_call),
1460 Rmethod);
1461
1462 // Reload method.
1463 __ get_method(Rmethod);
1464
1465 // Reload signature handler, it must have been created/assigned in the meantime.
1466 __ z_lg(signature_handler_entry, method2_(Rmethod, signature_handler));
1467
1468 __ bind(call_signature_handler);
1469
1470 // We have a TOP_IJAVA_FRAME here, which belongs to us.
1471 __ set_top_ijava_frame_at_SP_as_last_Java_frame(Z_SP, Z_R1/*tmp*/);
1472
1473 // Call signature handler and pass locals address in Z_ARG1.
1474 __ z_lgr(Z_ARG1, Z_locals);
1475 __ call_stub(signature_handler_entry);
1476 // Save result handler returned by signature handler.
1477 __ z_lgr(Rresult_handler, Z_RET);
1478
1479 // Reload method (the slow signature handler may block for GC).
1480 __ get_method(Rmethod);
1481
1482 // Pass mirror handle if static call.
1483 {
1484 Label method_is_not_static;
1485 __ testbit(method2_(Rmethod, access_flags), JVM_ACC_STATIC_BIT);
1486 __ z_bfalse(method_is_not_static);
1487 // Get mirror.
1488 __ load_mirror(Z_R1, Rmethod);
1489 // z_ijava_state.oop_temp = pool_holder->klass_part()->java_mirror();
1490 __ z_stg(Z_R1, oop_tmp_offset, Z_fp);
1491 // Pass handle to mirror as 2nd argument to JNI method.
1492 __ add2reg(Z_ARG2, oop_tmp_offset, Z_fp);
1493 __ bind(method_is_not_static);
1494 }
1495
1496 // Pass JNIEnv address as first parameter.
1497 __ add2reg(Z_ARG1, in_bytes(JavaThread::jni_environment_offset()), Z_thread);
1498
1499 // Note: last java frame has been set above already. The pc from there
1500 // is precise enough.
1501
1502 // Get native function entry point before we change the thread state.
1503 __ z_lg(Z_R1/*native_method_entry*/, method2_(Rmethod, native_function));
1504
1505 //=============================================================================
1506 // Transition from _thread_in_Java to _thread_in_native. As soon as
1507 // we make this change the safepoint code needs to be certain that
1508 // the last Java frame we established is good. The pc in that frame
1509 // just need to be near here not an actual return address.
1510 #ifdef ASSERT
1511 {
1512 NearLabel L;
1513 __ mem2reg_opt(Z_R14, Address(Z_thread, JavaThread::thread_state_offset()), false /*32 bits*/);
1514 __ compareU32_and_branch(Z_R14, _thread_in_Java, Assembler::bcondEqual, L);
1515 reentry = __ stop_chain_static(reentry, "Wrong thread state in native stub");
1516 __ bind(L);
1517 }
1518 #endif
1519
1520 // Memory ordering: Z does not reorder store/load with subsequent load. That's strong enough.
1521 __ set_thread_state(_thread_in_native);
1522
1523 //=============================================================================
1524 // Call the native method. Argument registers must not have been
1525 // overwritten since "__ call_stub(signature_handler);" (except for
1526 // ARG1 and ARG2 for static methods).
1527
1528 __ call_c(Z_R1/*native_method_entry*/);
1529
1530 // NOTE: frame::interpreter_frame_result() depends on these stores.
1531 __ z_stg(Z_RET, _z_ijava_state_neg(lresult), Z_fp);
1532 __ freg2mem_opt(Z_FRET, Address(Z_fp, _z_ijava_state_neg(fresult)));
1533 const Register Rlresult = signature_handler_entry;
1534 assert(Rlresult->is_nonvolatile(), "Rlresult must be in a non-volatile register");
1535 __ z_lgr(Rlresult, Z_RET);
1536
1537 // Z_method may no longer be valid, because of GC.
1538
1539 // Block, if necessary, before resuming in _thread_in_Java state.
1540 // In order for GC to work, don't clear the last_Java_sp until after
1541 // blocking.
1542
1543 //=============================================================================
1544 // Switch thread to "native transition" state before reading the
1545 // synchronization state. This additional state is necessary
1546 // because reading and testing the synchronization state is not
1547 // atomic w.r.t. GC, as this scenario demonstrates: Java thread A,
1548 // in _thread_in_native state, loads _not_synchronized and is
1549 // preempted. VM thread changes sync state to synchronizing and
1550 // suspends threads for GC. Thread A is resumed to finish this
1551 // native method, but doesn't block here since it didn't see any
1552 // synchronization is progress, and escapes.
1553
1554 __ set_thread_state(_thread_in_native_trans);
1555 if (UseMembar) {
1556 __ z_fence();
1557 } else {
1558 // Write serialization page so VM thread can do a pseudo remote
1559 // membar. We use the current thread pointer to calculate a thread
1560 // specific offset to write to within the page. This minimizes bus
1561 // traffic due to cache line collision.
1562 __ serialize_memory(Z_thread, Z_R1, Z_R0);
1563 }
1564 // Now before we return to java we must look for a current safepoint
1565 // (a new safepoint can not start since we entered native_trans).
1566 // We must check here because a current safepoint could be modifying
1567 // the callers registers right this moment.
1568
1569 // Check for safepoint operation in progress and/or pending suspend requests.
1570 {
1571 Label Continue, do_safepoint;
1572 __ generate_safepoint_check(do_safepoint, Z_R1, true);
1573 // Check for suspend.
1574 __ load_and_test_int(Z_R0/*suspend_flags*/, thread_(suspend_flags));
1575 __ z_bre(Continue); // 0 -> no flag set -> not suspended
1576 __ bind(do_safepoint);
1577 __ z_lgr(Z_ARG1, Z_thread);
1578 __ call_c(CAST_FROM_FN_PTR(address, JavaThread::check_special_condition_for_native_trans));
1579 __ bind(Continue);
1580 }
1581
1582 //=============================================================================
1583 // Back in Interpreter Frame.
1584
1585 // We are in thread_in_native_trans here and back in the normal
1586 // interpreter frame. We don't have to do anything special about
1587 // safepoints and we can switch to Java mode anytime we are ready.
1588
1589 // Note: frame::interpreter_frame_result has a dependency on how the
1590 // method result is saved across the call to post_method_exit. For
1591 // native methods it assumes that the non-FPU/non-void result is
1592 // saved in z_ijava_state.lresult and a FPU result in z_ijava_state.fresult. If
1593 // this changes then the interpreter_frame_result implementation
1594 // will need to be updated too.
1595
1596 //=============================================================================
1597 // Back in Java.
1598
1599 // Memory ordering: Z does not reorder store/load with subsequent
1600 // load. That's strong enough.
1601 __ set_thread_state(_thread_in_Java);
1602
1603 __ reset_last_Java_frame();
1604
1605 // We reset the JNI handle block only after unboxing the result; see below.
1606
1607 // The method register is junk from after the thread_in_native transition
1608 // until here. Also can't call_VM until the bcp has been
1609 // restored. Need bcp for throwing exception below so get it now.
1610 __ get_method(Rmethod);
1611
1612 // Restore Z_bcp to have legal interpreter frame,
1613 // i.e., bci == 0 <=> Z_bcp == code_base().
1614 __ z_lg(Z_bcp, Address(Rmethod, Method::const_offset())); // get constMethod
1615 __ add2reg(Z_bcp, in_bytes(ConstMethod::codes_offset())); // get codebase
1616
1617 if (CheckJNICalls) {
1618 // clear_pending_jni_exception_check
1619 __ clear_mem(Address(Z_thread, JavaThread::pending_jni_exception_check_fn_offset()), sizeof(oop));
1620 }
1621
1622 // Check if the native method returns an oop, and if so, move it
1623 // from the jni handle to z_ijava_state.oop_temp. This is
1624 // necessary, because we reset the jni handle block below.
1625 // NOTE: frame::interpreter_frame_result() depends on this, too.
1626 { NearLabel no_oop_result, store_oop_result;
1627 __ load_absolute_address(Z_R1, AbstractInterpreter::result_handler(T_OBJECT));
1628 __ compareU64_and_branch(Z_R1, Rresult_handler, Assembler::bcondNotEqual, no_oop_result);
1629 __ compareU64_and_branch(Rlresult, (intptr_t)0L, Assembler::bcondEqual, store_oop_result);
1630 __ z_lg(Rlresult, 0, Rlresult); // unbox
1631 __ bind(store_oop_result);
1632 __ z_stg(Rlresult, oop_tmp_offset, Z_fp);
1633 __ verify_oop(Rlresult);
1634 __ bind(no_oop_result);
1635 }
1636
1637 // Reset handle block.
1638 __ z_lg(Z_R1/*active_handles*/, thread_(active_handles));
1639 __ clear_mem(Address(Z_R1, JNIHandleBlock::top_offset_in_bytes()), 4);
1640
1641 // Bandle exceptions (exception handling will handle unlocking!).
1642 {
1643 Label L;
1644 __ load_and_test_long(Z_R0/*pending_exception*/, thread_(pending_exception));
1645 __ z_bre(L);
1646 __ MacroAssembler::call_VM(noreg,
1647 CAST_FROM_FN_PTR(address,
1648 InterpreterRuntime::throw_pending_exception));
1649 __ should_not_reach_here();
1650 __ bind(L);
1651 }
1652
1653 if (synchronized) {
1654 Register Rfirst_monitor = Z_ARG2;
1655 __ add2reg(Rfirst_monitor, -(frame::z_ijava_state_size + (int)sizeof(BasicObjectLock)), Z_fp);
1656 #ifdef ASSERT
1657 NearLabel ok;
1658 __ z_lg(Z_R1, _z_ijava_state_neg(monitors), Z_fp);
1659 __ compareU64_and_branch(Rfirst_monitor, Z_R1, Assembler::bcondEqual, ok);
1660 reentry = __ stop_chain_static(reentry, "native_entry:unlock: inconsistent z_ijava_state.monitors");
1661 __ bind(ok);
1662 #endif
1663 __ unlock_object(Rfirst_monitor);
1664 }
1665
1666 // JVMTI support. Result has already been saved above to the frame.
1667 __ notify_method_exit(true/*native_method*/, ilgl, InterpreterMacroAssembler::NotifyJVMTI);
1668
1669 // Move native method result back into proper registers and return.
1670 // C++ interpreter does not use result handler. So do we need to here? TODO(ZASM): check if correct.
1671 { NearLabel no_oop_or_null;
1672 __ mem2freg_opt(Z_FRET, Address(Z_fp, _z_ijava_state_neg(fresult)));
1673 __ load_and_test_long(Z_RET, Address(Z_fp, _z_ijava_state_neg(lresult)));
1674 __ z_bre(no_oop_or_null); // No unboxing if the result is NULL.
1675 __ load_absolute_address(Z_R1, AbstractInterpreter::result_handler(T_OBJECT));
1676 __ compareU64_and_branch(Z_R1, Rresult_handler, Assembler::bcondNotEqual, no_oop_or_null);
1677 __ z_lg(Z_RET, oop_tmp_offset, Z_fp);
1678 __ verify_oop(Z_RET);
1679 __ bind(no_oop_or_null);
1680 }
1681
1682 // Pop the native method's interpreter frame.
1683 __ pop_interpreter_frame(Z_R14 /*return_pc*/, Z_ARG2/*tmp1*/, Z_ARG3/*tmp2*/);
1684
1685 // Return to caller.
1686 __ z_br(Z_R14);
1687
1688 if (inc_counter) {
1689 // Handle overflow of counter and compile method.
1690 __ bind(invocation_counter_overflow);
1691 generate_counter_overflow(continue_after_compile);
1692 }
1693
1694 BLOCK_COMMENT("} native_entry");
1695
1696 return entry_point;
1697 }
1698
1699 //
1700 // Generic interpreted method entry to template interpreter.
1701 //
1702 address TemplateInterpreterGenerator::generate_normal_entry(bool synchronized) {
1703 address entry_point = __ pc();
1704
1705 bool inc_counter = UseCompiler || CountCompiledCalls || LogTouchedMethods;
1706
1707 // Interpreter entry for ordinary Java methods.
1708 //
1709 // Registers alive
1710 // Z_SP - stack pointer
1711 // Z_thread - JavaThread*
1712 // Z_method - callee's method (method to be invoked)
1713 // Z_esp - operand (or expression) stack pointer of caller. one slot above last arg.
1714 // Z_R10 - sender sp (before modifications, e.g. by c2i adapter
1715 // and as well by generate_fixed_frame below)
1716 // Z_R14 - return address to caller (call_stub or c2i_adapter)
1717 //
1718 // Registers updated
1719 // Z_SP - stack pointer
1720 // Z_fp - callee's framepointer
1721 // Z_esp - callee's operand stack pointer
1722 // points to the slot above the value on top
1723 // Z_locals - used to access locals: locals[i] := *(Z_locals - i*BytesPerWord)
1724 // Z_tos - integer result, if any
1725 // z_ftos - floating point result, if any
1726 //
1727 //
1728 // stack layout at this point:
1729 //
1730 // F1 [TOP_IJAVA_FRAME_ABI] <-- Z_SP, Z_R10 (Z_R10 will be below Z_SP if
1731 // frame was extended by c2i adapter)
1732 // [outgoing Java arguments] <-- Z_esp
1733 // ...
1734 // PARENT [PARENT_IJAVA_FRAME_ABI]
1735 // ...
1736 //
1737 // stack layout before dispatching the first bytecode:
1738 //
1739 // F0 [TOP_IJAVA_FRAME_ABI] <-- Z_SP
1740 // [operand stack] <-- Z_esp
1741 // monitor (optional, can grow)
1742 // [IJAVA_STATE]
1743 // F1 [PARENT_IJAVA_FRAME_ABI] <-- Z_fp (== *Z_SP)
1744 // [F0's locals] <-- Z_locals
1745 // [F1's operand stack]
1746 // [F1's monitors] (optional)
1747 // [IJAVA_STATE]
1748
1749 // Make sure registers are different!
1750 assert_different_registers(Z_thread, Z_method, Z_esp);
1751
1752 BLOCK_COMMENT("normal_entry {");
1753
1754 // Make sure method is not native and not abstract.
1755 // Rethink these assertions - they can be simplified and shared.
1756 #ifdef ASSERT
1757 address reentry = NULL;
1758 { Label L;
1759 __ testbit(method_(access_flags), JVM_ACC_NATIVE_BIT);
1760 __ z_bfalse(L);
1761 reentry = __ stop_chain_static(reentry, "tried to execute native method as non-native");
1762 __ bind(L);
1763 }
1764 { Label L;
1765 __ testbit(method_(access_flags), JVM_ACC_ABSTRACT_BIT);
1766 __ z_bfalse(L);
1767 reentry = __ stop_chain_static(reentry, "tried to execute abstract method as non-abstract");
1768 __ bind(L);
1769 }
1770 #endif // ASSERT
1771
1772 #ifdef ASSERT
1773 // Save the return PC into the callers frame for assertion in generate_fixed_frame.
1774 __ save_return_pc(Z_R14);
1775 #endif
1776
1777 // Generate the code to allocate the interpreter stack frame.
1778 generate_fixed_frame(false);
1779
1780 const Address do_not_unlock_if_synchronized(Z_thread, JavaThread::do_not_unlock_if_synchronized_offset());
1781 // Since at this point in the method invocation the exception handler
1782 // would try to exit the monitor of synchronized methods which hasn't
1783 // been entered yet, we set the thread local variable
1784 // _do_not_unlock_if_synchronized to true. If any exception was thrown by
1785 // runtime, exception handling i.e. unlock_if_synchronized_method will
1786 // check this thread local flag.
1787 __ z_mvi(do_not_unlock_if_synchronized, true);
1788
1789 __ profile_parameters_type(Z_tmp_2, Z_ARG3, Z_ARG4);
1790
1791 // Increment invocation counter and check for overflow.
1792 //
1793 // Note: checking for negative value instead of overflow so we have a 'sticky'
1794 // overflow test (may be of importance as soon as we have true MT/MP).
1795 NearLabel invocation_counter_overflow;
1796 NearLabel profile_method;
1797 NearLabel profile_method_continue;
1798 NearLabel Lcontinue;
1799 if (inc_counter) {
1800 generate_counter_incr(&invocation_counter_overflow, &profile_method, &profile_method_continue);
1801 if (ProfileInterpreter) {
1802 __ bind(profile_method_continue);
1803 }
1804 }
1805 __ bind(Lcontinue);
1806
1807 bang_stack_shadow_pages(false);
1808
1809 // Reset the _do_not_unlock_if_synchronized flag.
1810 __ z_mvi(do_not_unlock_if_synchronized, false);
1811
1812 // Check for synchronized methods.
1813 // Must happen AFTER invocation_counter check and stack overflow check,
1814 // so method is not locked if overflows.
1815 if (synchronized) {
1816 // Allocate monitor and lock method.
1817 lock_method();
1818 } else {
1819 #ifdef ASSERT
1820 { Label L;
1821 __ get_method(Z_R1_scratch);
1822 __ testbit(method2_(Z_R1_scratch, access_flags), JVM_ACC_SYNCHRONIZED_BIT);
1823 __ z_bfalse(L);
1824 reentry = __ stop_chain_static(reentry, "method needs synchronization");
1825 __ bind(L);
1826 }
1827 #endif // ASSERT
1828 }
1829
1830 // start execution
1831
1832 #ifdef ASSERT
1833 __ verify_esp(Z_esp, Z_R1_scratch);
1834
1835 __ verify_thread();
1836 #endif
1837
1838 // jvmti support
1839 __ notify_method_entry();
1840
1841 // Start executing instructions.
1842 __ dispatch_next(vtos);
1843 // Dispatch_next does not return.
1844 DEBUG_ONLY(__ should_not_reach_here());
1845
1846 // Invocation counter overflow.
1847 if (inc_counter) {
1848 if (ProfileInterpreter) {
1849 // We have decided to profile this method in the interpreter.
1850 __ bind(profile_method);
1851
1852 __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::profile_method));
1853 __ set_method_data_pointer_for_bcp();
1854 __ z_bru(profile_method_continue);
1855 }
1856
1857 // Handle invocation counter overflow.
1858 __ bind(invocation_counter_overflow);
1859 generate_counter_overflow(Lcontinue);
1860 }
1861
1862 BLOCK_COMMENT("} normal_entry");
1863
1864 return entry_point;
1865 }
1866
1867 // Method entry for static native methods:
1868 // int java.util.zip.CRC32.update(int crc, int b)
1869 address TemplateInterpreterGenerator::generate_CRC32_update_entry() {
1870
1871 if (UseCRC32Intrinsics) {
1872 uint64_t entry_off = __ offset();
1873 Label slow_path;
1874
1875 // If we need a safepoint check, generate full interpreter entry.
1876 __ generate_safepoint_check(slow_path, Z_R1, false);
1877
1878 BLOCK_COMMENT("CRC32_update {");
1879
1880 // We don't generate local frame and don't align stack because
1881 // we not even call stub code (we generate the code inline)
1882 // and there is no safepoint on this path.
1883
1884 // Load java parameters.
1885 // Z_esp is callers operand stack pointer, i.e. it points to the parameters.
1886 const Register argP = Z_esp;
1887 const Register crc = Z_ARG1; // crc value
1888 const Register data = Z_ARG2; // address of java byte value (kernel_crc32 needs address)
1889 const Register dataLen = Z_ARG3; // source data len (1 byte). Not used because calling the single-byte emitter.
1890 const Register table = Z_ARG4; // address of crc32 table
1891
1892 // Arguments are reversed on java expression stack.
1893 __ z_la(data, 3+1*wordSize, argP); // byte value (stack address).
1894 // Being passed as an int, the single byte is at offset +3.
1895 __ z_llgf(crc, 2 * wordSize, argP); // Current crc state, zero extend to 64 bit to have a clean register.
1896
1897 StubRoutines::zarch::generate_load_crc_table_addr(_masm, table);
1898 __ kernel_crc32_singleByte(crc, data, dataLen, table, Z_R1);
1899
1900 // Restore caller sp for c2i case.
1901 __ resize_frame_absolute(Z_R10, Z_R0, true); // Cut the stack back to where the caller started.
1902
1903 __ z_br(Z_R14);
1904
1905 BLOCK_COMMENT("} CRC32_update");
1906
1907 // Use a previously generated vanilla native entry as the slow path.
1908 BIND(slow_path);
1909 __ jump_to_entry(Interpreter::entry_for_kind(Interpreter::native), Z_R1);
1910 return __ addr_at(entry_off);
1911 }
1912
1913 return NULL;
1914 }
1915
1916
1917 // Method entry for static native methods:
1918 // int java.util.zip.CRC32.updateBytes(int crc, byte[] b, int off, int len)
1919 // int java.util.zip.CRC32.updateByteBuffer(int crc, long buf, int off, int len)
1920 address TemplateInterpreterGenerator::generate_CRC32_updateBytes_entry(AbstractInterpreter::MethodKind kind) {
1921
1922 if (UseCRC32Intrinsics) {
1923 uint64_t entry_off = __ offset();
1924 Label slow_path;
1925
1926 // If we need a safepoint check, generate full interpreter entry.
1927 __ generate_safepoint_check(slow_path, Z_R1, false);
1928
1929 // We don't generate local frame and don't align stack because
1930 // we call stub code and there is no safepoint on this path.
1931
1932 // Load parameters.
1933 // Z_esp is callers operand stack pointer, i.e. it points to the parameters.
1934 const Register argP = Z_esp;
1935 const Register crc = Z_ARG1; // crc value
1936 const Register data = Z_ARG2; // address of java byte array
1937 const Register dataLen = Z_ARG3; // source data len
1938 const Register table = Z_ARG4; // address of crc32 table
1939 const Register t0 = Z_R10; // work reg for kernel* emitters
1940 const Register t1 = Z_R11; // work reg for kernel* emitters
1941 const Register t2 = Z_R12; // work reg for kernel* emitters
1942 const Register t3 = Z_R13; // work reg for kernel* emitters
1943
1944 // Arguments are reversed on java expression stack.
1945 // Calculate address of start element.
1946 if (kind == Interpreter::java_util_zip_CRC32_updateByteBuffer) { // Used for "updateByteBuffer direct".
1947 // crc @ (SP + 5W) (32bit)
1948 // buf @ (SP + 3W) (64bit ptr to long array)
1949 // off @ (SP + 2W) (32bit)
1950 // dataLen @ (SP + 1W) (32bit)
1951 // data = buf + off
1952 BLOCK_COMMENT("CRC32_updateByteBuffer {");
1953 __ z_llgf(crc, 5*wordSize, argP); // current crc state
1954 __ z_lg(data, 3*wordSize, argP); // start of byte buffer
1955 __ z_agf(data, 2*wordSize, argP); // Add byte buffer offset.
1956 __ z_lgf(dataLen, 1*wordSize, argP); // #bytes to process
1957 } else { // Used for "updateBytes update".
1958 // crc @ (SP + 4W) (32bit)
1959 // buf @ (SP + 3W) (64bit ptr to byte array)
1960 // off @ (SP + 2W) (32bit)
1961 // dataLen @ (SP + 1W) (32bit)
1962 // data = buf + off + base_offset
1963 BLOCK_COMMENT("CRC32_updateBytes {");
1964 __ z_llgf(crc, 4*wordSize, argP); // current crc state
1965 __ z_lg(data, 3*wordSize, argP); // start of byte buffer
1966 __ z_agf(data, 2*wordSize, argP); // Add byte buffer offset.
1967 __ z_lgf(dataLen, 1*wordSize, argP); // #bytes to process
1968 __ z_aghi(data, arrayOopDesc::base_offset_in_bytes(T_BYTE));
1969 }
1970
1971 StubRoutines::zarch::generate_load_crc_table_addr(_masm, table);
1972
1973 __ resize_frame(-(6*8), Z_R0, true); // Resize frame to provide add'l space to spill 5 registers.
1974 __ z_stmg(t0, t3, 1*8, Z_SP); // Spill regs 10..13 to make them available as work registers.
1975 __ kernel_crc32_1word(crc, data, dataLen, table, t0, t1, t2, t3);
1976 __ z_lmg(t0, t3, 1*8, Z_SP); // Spill regs 10..13 back from stack.
1977
1978 // Restore caller sp for c2i case.
1979 __ resize_frame_absolute(Z_R10, Z_R0, true); // Cut the stack back to where the caller started.
1980
1981 __ z_br(Z_R14);
1982
1983 BLOCK_COMMENT("} CRC32_update{Bytes|ByteBuffer}");
1984
1985 // Use a previously generated vanilla native entry as the slow path.
1986 BIND(slow_path);
1987 __ jump_to_entry(Interpreter::entry_for_kind(Interpreter::native), Z_R1);
1988 return __ addr_at(entry_off);
1989 }
1990
1991 return NULL;
1992 }
1993
1994 // Not supported
1995 address TemplateInterpreterGenerator::generate_CRC32C_updateBytes_entry(AbstractInterpreter::MethodKind kind) {
1996 return NULL;
1997 }
1998
1999 void TemplateInterpreterGenerator::bang_stack_shadow_pages(bool native_call) {
2000 // Quick & dirty stack overflow checking: bang the stack & handle trap.
2001 // Note that we do the banging after the frame is setup, since the exception
2002 // handling code expects to find a valid interpreter frame on the stack.
2003 // Doing the banging earlier fails if the caller frame is not an interpreter
2004 // frame.
2005 // (Also, the exception throwing code expects to unlock any synchronized
2006 // method receiver, so do the banging after locking the receiver.)
2007
2008 // Bang each page in the shadow zone. We can't assume it's been done for
2009 // an interpreter frame with greater than a page of locals, so each page
2010 // needs to be checked. Only true for non-native. For native, we only bang the last page.
2011 if (UseStackBanging) {
2012 const int page_size = os::vm_page_size();
2013 const int n_shadow_pages = (int)(JavaThread::stack_shadow_zone_size()/page_size);
2014 const int start_page_num = native_call ? n_shadow_pages : 1;
2015 for (int pages = start_page_num; pages <= n_shadow_pages; pages++) {
2016 __ bang_stack_with_offset(pages*page_size);
2017 }
2018 }
2019 }
2020
2021 //-----------------------------------------------------------------------------
2022 // Exceptions
2023
2024 void TemplateInterpreterGenerator::generate_throw_exception() {
2025
2026 BLOCK_COMMENT("throw_exception {");
2027
2028 // Entry point in previous activation (i.e., if the caller was interpreted).
2029 Interpreter::_rethrow_exception_entry = __ pc();
2030 __ z_lg(Z_fp, _z_abi(callers_sp), Z_SP); // Frame accessors use Z_fp.
2031 // Z_ARG1 (==Z_tos): exception
2032 // Z_ARG2 : Return address/pc that threw exception.
2033 __ restore_bcp(); // R13 points to call/send.
2034 __ restore_locals();
2035
2036 // Fallthrough, no need to restore Z_esp.
2037
2038 // Entry point for exceptions thrown within interpreter code.
2039 Interpreter::_throw_exception_entry = __ pc();
2040 // Expression stack is undefined here.
2041 // Z_ARG1 (==Z_tos): exception
2042 // Z_bcp: exception bcp
2043 __ verify_oop(Z_ARG1);
2044 __ z_lgr(Z_ARG2, Z_ARG1);
2045
2046 // Expression stack must be empty before entering the VM in case of
2047 // an exception.
2048 __ empty_expression_stack();
2049 // Find exception handler address and preserve exception oop.
2050 const Register Rpreserved_exc_oop = Z_tmp_1;
2051 __ call_VM(Rpreserved_exc_oop,
2052 CAST_FROM_FN_PTR(address, InterpreterRuntime::exception_handler_for_exception),
2053 Z_ARG2);
2054 // Z_RET: exception handler entry point
2055 // Z_bcp: bcp for exception handler
2056 __ push_ptr(Rpreserved_exc_oop); // Push exception which is now the only value on the stack.
2057 __ z_br(Z_RET); // Jump to exception handler (may be _remove_activation_entry!).
2058
2059 // If the exception is not handled in the current frame the frame is
2060 // removed and the exception is rethrown (i.e. exception
2061 // continuation is _rethrow_exception).
2062 //
2063 // Note: At this point the bci is still the bci for the instruction
2064 // which caused the exception and the expression stack is
2065 // empty. Thus, for any VM calls at this point, GC will find a legal
2066 // oop map (with empty expression stack).
2067
2068 //
2069 // JVMTI PopFrame support
2070 //
2071
2072 Interpreter::_remove_activation_preserving_args_entry = __ pc();
2073 __ z_lg(Z_fp, _z_parent_ijava_frame_abi(callers_sp), Z_SP);
2074 __ empty_expression_stack();
2075 // Set the popframe_processing bit in pending_popframe_condition
2076 // indicating that we are currently handling popframe, so that
2077 // call_VMs that may happen later do not trigger new popframe
2078 // handling cycles.
2079 __ load_sized_value(Z_tmp_1, Address(Z_thread, JavaThread::popframe_condition_offset()), 4, false /*signed*/);
2080 __ z_oill(Z_tmp_1, JavaThread::popframe_processing_bit);
2081 __ z_sty(Z_tmp_1, thread_(popframe_condition));
2082
2083 {
2084 // Check to see whether we are returning to a deoptimized frame.
2085 // (The PopFrame call ensures that the caller of the popped frame is
2086 // either interpreted or compiled and deoptimizes it if compiled.)
2087 // In this case, we can't call dispatch_next() after the frame is
2088 // popped, but instead must save the incoming arguments and restore
2089 // them after deoptimization has occurred.
2090 //
2091 // Note that we don't compare the return PC against the
2092 // deoptimization blob's unpack entry because of the presence of
2093 // adapter frames in C2.
2094 NearLabel caller_not_deoptimized;
2095 __ z_lg(Z_ARG1, _z_parent_ijava_frame_abi(return_pc), Z_fp);
2096 __ call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::interpreter_contains), Z_ARG1);
2097 __ compareU64_and_branch(Z_RET, (intptr_t)0, Assembler::bcondNotEqual, caller_not_deoptimized);
2098
2099 // Compute size of arguments for saving when returning to
2100 // deoptimized caller.
2101 __ get_method(Z_ARG2);
2102 __ z_lg(Z_ARG2, Address(Z_ARG2, Method::const_offset()));
2103 __ z_llgh(Z_ARG2, Address(Z_ARG2, ConstMethod::size_of_parameters_offset()));
2104 __ z_sllg(Z_ARG2, Z_ARG2, Interpreter::logStackElementSize); // slots 2 bytes
2105 __ restore_locals();
2106 // Compute address of args to be saved.
2107 __ z_lgr(Z_ARG3, Z_locals);
2108 __ z_slgr(Z_ARG3, Z_ARG2);
2109 __ add2reg(Z_ARG3, wordSize);
2110 // Save these arguments.
2111 __ call_VM_leaf(CAST_FROM_FN_PTR(address, Deoptimization::popframe_preserve_args),
2112 Z_thread, Z_ARG2, Z_ARG3);
2113
2114 __ remove_activation(vtos, Z_R14,
2115 /* throw_monitor_exception */ false,
2116 /* install_monitor_exception */ false,
2117 /* notify_jvmdi */ false);
2118
2119 // Inform deoptimization that it is responsible for restoring
2120 // these arguments.
2121 __ store_const(thread_(popframe_condition),
2122 JavaThread::popframe_force_deopt_reexecution_bit,
2123 Z_tmp_1, false);
2124
2125 // Continue in deoptimization handler.
2126 __ z_br(Z_R14);
2127
2128 __ bind(caller_not_deoptimized);
2129 }
2130
2131 // Clear the popframe condition flag.
2132 __ clear_mem(thread_(popframe_condition), sizeof(int));
2133
2134 __ remove_activation(vtos,
2135 noreg, // Retaddr is not used.
2136 false, // throw_monitor_exception
2137 false, // install_monitor_exception
2138 false); // notify_jvmdi
2139 __ z_lg(Z_fp, _z_abi(callers_sp), Z_SP); // Restore frame pointer.
2140 __ restore_bcp();
2141 __ restore_locals();
2142 __ restore_esp();
2143 // The method data pointer was incremented already during
2144 // call profiling. We have to restore the mdp for the current bcp.
2145 if (ProfileInterpreter) {
2146 __ set_method_data_pointer_for_bcp();
2147 }
2148 #if INCLUDE_JVMTI
2149 {
2150 Label L_done;
2151
2152 __ z_cli(0, Z_bcp, Bytecodes::_invokestatic);
2153 __ z_brc(Assembler::bcondNotEqual, L_done);
2154
2155 // The member name argument must be restored if _invokestatic is
2156 // re-executed after a PopFrame call. Detect such a case in the
2157 // InterpreterRuntime function and return the member name
2158 // argument, or NULL.
2159 __ z_lg(Z_ARG2, Address(Z_locals));
2160 __ get_method(Z_ARG3);
2161 __ call_VM(Z_tmp_1,
2162 CAST_FROM_FN_PTR(address, InterpreterRuntime::member_name_arg_or_null),
2163 Z_ARG2, Z_ARG3, Z_bcp);
2164
2165 __ z_ltgr(Z_tmp_1, Z_tmp_1);
2166 __ z_brc(Assembler::bcondEqual, L_done);
2167
2168 __ z_stg(Z_tmp_1, Address(Z_esp, wordSize));
2169 __ bind(L_done);
2170 }
2171 #endif // INCLUDE_JVMTI
2172 __ dispatch_next(vtos);
2173 // End of PopFrame support.
2174 Interpreter::_remove_activation_entry = __ pc();
2175
2176 // In between activations - previous activation type unknown yet
2177 // compute continuation point - the continuation point expects the
2178 // following registers set up:
2179 //
2180 // Z_ARG1 (==Z_tos): exception
2181 // Z_ARG2 : return address/pc that threw exception
2182
2183 Register return_pc = Z_tmp_1;
2184 Register handler = Z_tmp_2;
2185 assert(return_pc->is_nonvolatile(), "use non-volatile reg. to preserve exception pc");
2186 assert(handler->is_nonvolatile(), "use non-volatile reg. to handler pc");
2187 __ asm_assert_ijava_state_magic(return_pc/*tmp*/); // The top frame should be an interpreter frame.
2188 __ z_lg(return_pc, _z_parent_ijava_frame_abi(return_pc), Z_fp);
2189
2190 // Moved removing the activation after VM call, because the new top
2191 // frame does not necessarily have the z_abi_160 required for a VM
2192 // call (e.g. if it is compiled).
2193
2194 __ super_call_VM_leaf(CAST_FROM_FN_PTR(address,
2195 SharedRuntime::exception_handler_for_return_address),
2196 Z_thread, return_pc);
2197 __ z_lgr(handler, Z_RET); // Save exception handler.
2198
2199 // Preserve exception over this code sequence.
2200 __ pop_ptr(Z_ARG1);
2201 __ set_vm_result(Z_ARG1);
2202 // Remove the activation (without doing throws on illegalMonitorExceptions).
2203 __ remove_activation(vtos, noreg/*ret.pc already loaded*/, false/*throw exc*/, true/*install exc*/, false/*notify jvmti*/);
2204 __ z_lg(Z_fp, _z_abi(callers_sp), Z_SP); // Restore frame pointer.
2205
2206 __ get_vm_result(Z_ARG1); // Restore exception.
2207 __ verify_oop(Z_ARG1);
2208 __ z_lgr(Z_ARG2, return_pc); // Restore return address.
2209
2210 #ifdef ASSERT
2211 // The return_pc in the new top frame is dead... at least that's my
2212 // current understanding. To assert this I overwrite it.
2213 // Note: for compiled frames the handler is the deopt blob
2214 // which writes Z_ARG2 into the return_pc slot.
2215 __ load_const_optimized(return_pc, 0xb00b1);
2216 __ z_stg(return_pc, _z_parent_ijava_frame_abi(return_pc), Z_SP);
2217 #endif
2218
2219 // Z_ARG1 (==Z_tos): exception
2220 // Z_ARG2 : return address/pc that threw exception
2221
2222 // Note that an "issuing PC" is actually the next PC after the call.
2223 __ z_br(handler); // Jump to exception handler of caller.
2224
2225 BLOCK_COMMENT("} throw_exception");
2226 }
2227
2228 //
2229 // JVMTI ForceEarlyReturn support
2230 //
2231 address TemplateInterpreterGenerator::generate_earlyret_entry_for (TosState state) {
2232 address entry = __ pc();
2233
2234 BLOCK_COMMENT("earlyret_entry {");
2235
2236 __ z_lg(Z_fp, _z_parent_ijava_frame_abi(callers_sp), Z_SP);
2237 __ restore_bcp();
2238 __ restore_locals();
2239 __ restore_esp();
2240 __ empty_expression_stack();
2241 __ load_earlyret_value(state);
2242
2243 Register RjvmtiState = Z_tmp_1;
2244 __ z_lg(RjvmtiState, thread_(jvmti_thread_state));
2245 __ store_const(Address(RjvmtiState, JvmtiThreadState::earlyret_state_offset()),
2246 JvmtiThreadState::earlyret_inactive, 4, 4, Z_R0_scratch);
2247
2248 __ remove_activation(state,
2249 Z_tmp_1, // retaddr
2250 false, // throw_monitor_exception
2251 false, // install_monitor_exception
2252 true); // notify_jvmdi
2253 __ z_br(Z_tmp_1);
2254
2255 BLOCK_COMMENT("} earlyret_entry");
2256
2257 return entry;
2258 }
2259
2260 //-----------------------------------------------------------------------------
2261 // Helper for vtos entry point generation.
2262
2263 void TemplateInterpreterGenerator::set_vtos_entry_points(Template* t,
2264 address& bep,
2265 address& cep,
2266 address& sep,
2267 address& aep,
2268 address& iep,
2269 address& lep,
2270 address& fep,
2271 address& dep,
2272 address& vep) {
2273 assert(t->is_valid() && t->tos_in() == vtos, "illegal template");
2274 Label L;
2275 aep = __ pc(); __ push_ptr(); __ z_bru(L);
2276 fep = __ pc(); __ push_f(); __ z_bru(L);
2277 dep = __ pc(); __ push_d(); __ z_bru(L);
2278 lep = __ pc(); __ push_l(); __ z_bru(L);
2279 bep = cep = sep =
2280 iep = __ pc(); __ push_i();
2281 vep = __ pc();
2282 __ bind(L);
2283 generate_and_dispatch(t);
2284 }
2285
2286 //-----------------------------------------------------------------------------
2287
2288 #ifndef PRODUCT
2289 address TemplateInterpreterGenerator::generate_trace_code(TosState state) {
2290 address entry = __ pc();
2291 NearLabel counter_below_trace_threshold;
2292
2293 if (TraceBytecodesAt > 0) {
2294 // Skip runtime call, if the trace threshold is not yet reached.
2295 __ load_absolute_address(Z_tmp_1, (address)&BytecodeCounter::_counter_value);
2296 __ load_absolute_address(Z_tmp_2, (address)&TraceBytecodesAt);
2297 __ load_sized_value(Z_tmp_1, Address(Z_tmp_1), 4, false /*signed*/);
2298 __ load_sized_value(Z_tmp_2, Address(Z_tmp_2), 8, false /*signed*/);
2299 __ compareU64_and_branch(Z_tmp_1, Z_tmp_2, Assembler::bcondLow, counter_below_trace_threshold);
2300 }
2301
2302 int offset2 = state == ltos || state == dtos ? 2 : 1;
2303
2304 __ push(state);
2305 // Preserved return pointer is in Z_R14.
2306 // InterpreterRuntime::trace_bytecode() preserved and returns the value passed as second argument.
2307 __ z_lgr(Z_ARG2, Z_R14);
2308 __ z_lg(Z_ARG3, Address(Z_esp, Interpreter::expr_offset_in_bytes(0)));
2309 if (WizardMode) {
2310 __ z_lgr(Z_ARG4, Z_esp); // Trace Z_esp in WizardMode.
2311 } else {
2312 __ z_lg(Z_ARG4, Address(Z_esp, Interpreter::expr_offset_in_bytes(offset2)));
2313 }
2314 __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::trace_bytecode), Z_ARG2, Z_ARG3, Z_ARG4);
2315 __ z_lgr(Z_R14, Z_RET); // Estore return address (see above).
2316 __ pop(state);
2317
2318 __ bind(counter_below_trace_threshold);
2319 __ z_br(Z_R14); // return
2320
2321 return entry;
2322 }
2323
2324 // Make feasible for old CPUs.
2325 void TemplateInterpreterGenerator::count_bytecode() {
2326 __ load_absolute_address(Z_R1_scratch, (address) &BytecodeCounter::_counter_value);
2327 __ add2mem_32(Address(Z_R1_scratch), 1, Z_R0_scratch);
2328 }
2329
2330 void TemplateInterpreterGenerator::histogram_bytecode(Template * t) {
2331 __ load_absolute_address(Z_R1_scratch, (address)&BytecodeHistogram::_counters[ t->bytecode() ]);
2332 __ add2mem_32(Address(Z_R1_scratch), 1, Z_tmp_1);
2333 }
2334
2335 void TemplateInterpreterGenerator::histogram_bytecode_pair(Template * t) {
2336 Address index_addr(Z_tmp_1, (intptr_t) 0);
2337 Register index = Z_tmp_2;
2338
2339 // Load previous index.
2340 __ load_absolute_address(Z_tmp_1, (address) &BytecodePairHistogram::_index);
2341 __ mem2reg_opt(index, index_addr, false);
2342
2343 // Mask with current bytecode and store as new previous index.
2344 __ z_srl(index, BytecodePairHistogram::log2_number_of_codes);
2345 __ load_const_optimized(Z_R0_scratch,
2346 (int)t->bytecode() << BytecodePairHistogram::log2_number_of_codes);
2347 __ z_or(index, Z_R0_scratch);
2348 __ reg2mem_opt(index, index_addr, false);
2349
2350 // Load counter array's address.
2351 __ z_lgfr(index, index); // Sign extend for addressing.
2352 __ z_sllg(index, index, LogBytesPerInt); // index2bytes
2353 __ load_absolute_address(Z_R1_scratch,
2354 (address) &BytecodePairHistogram::_counters);
2355 // Add index and increment counter.
2356 __ z_agr(Z_R1_scratch, index);
2357 __ add2mem_32(Address(Z_R1_scratch), 1, Z_tmp_1);
2358 }
2359
2360 void TemplateInterpreterGenerator::trace_bytecode(Template* t) {
2361 // Call a little run-time stub to avoid blow-up for each bytecode.
2362 // The run-time runtime saves the right registers, depending on
2363 // the tosca in-state for the given template.
2364 address entry = Interpreter::trace_code(t->tos_in());
2365 guarantee(entry != NULL, "entry must have been generated");
2366 __ call_stub(entry);
2367 }
2368
2369 void TemplateInterpreterGenerator::stop_interpreter_at() {
2370 NearLabel L;
2371
2372 __ load_absolute_address(Z_tmp_1, (address)&BytecodeCounter::_counter_value);
2373 __ load_absolute_address(Z_tmp_2, (address)&StopInterpreterAt);
2374 __ load_sized_value(Z_tmp_1, Address(Z_tmp_1), 4, false /*signed*/);
2375 __ load_sized_value(Z_tmp_2, Address(Z_tmp_2), 8, false /*signed*/);
2376 __ compareU64_and_branch(Z_tmp_1, Z_tmp_2, Assembler::bcondLow, L);
2377 assert(Z_tmp_1->is_nonvolatile(), "must be nonvolatile to preserve Z_tos");
2378 assert(Z_F8->is_nonvolatile(), "must be nonvolatile to preserve Z_ftos");
2379 __ z_lgr(Z_tmp_1, Z_tos); // Save tos.
2380 __ z_lgr(Z_tmp_2, Z_bytecode); // Save Z_bytecode.
2381 __ z_ldr(Z_F8, Z_ftos); // Save ftos.
2382 // Use -XX:StopInterpreterAt=<num> to set the limit
2383 // and break at breakpoint().
2384 __ call_VM(noreg, CAST_FROM_FN_PTR(address, breakpoint), false);
2385 __ z_lgr(Z_tos, Z_tmp_1); // Restore tos.
2386 __ z_lgr(Z_bytecode, Z_tmp_2); // Save Z_bytecode.
2387 __ z_ldr(Z_ftos, Z_F8); // Restore ftos.
2388 __ bind(L);
2389 }
2390
2391 #endif // !PRODUCT