1 /*
2 * Copyright (c) 2016, 2020, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2016, 2020 SAP SE. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 #include "precompiled.hpp"
27 #include "asm/macroAssembler.inline.hpp"
28 #include "classfile/javaClasses.hpp"
29 #include "gc/shared/barrierSetAssembler.hpp"
30 #include "interpreter/abstractInterpreter.hpp"
31 #include "interpreter/bytecodeHistogram.hpp"
32 #include "interpreter/interpreter.hpp"
33 #include "interpreter/interpreterRuntime.hpp"
34 #include "interpreter/interp_masm.hpp"
35 #include "interpreter/templateInterpreterGenerator.hpp"
36 #include "interpreter/templateTable.hpp"
37 #include "oops/arrayOop.hpp"
38 #include "oops/methodData.hpp"
39 #include "oops/oop.inline.hpp"
40 #include "prims/jvmtiExport.hpp"
41 #include "prims/jvmtiThreadState.hpp"
42 #include "runtime/arguments.hpp"
43 #include "runtime/deoptimization.hpp"
44 #include "runtime/frame.inline.hpp"
45 #include "runtime/sharedRuntime.hpp"
46 #include "runtime/stubRoutines.hpp"
47 #include "runtime/synchronizer.hpp"
48 #include "runtime/timer.hpp"
49 #include "runtime/vframeArray.hpp"
50 #include "utilities/debug.hpp"
51
52
53 // Size of interpreter code. Increase if too small. Interpreter will
54 // fail with a guarantee ("not enough space for interpreter generation");
55 // if too small.
56 // Run with +PrintInterpreter to get the VM to print out the size.
57 // Max size with JVMTI
58 int TemplateInterpreter::InterpreterCodeSize = 320*K;
59
60 #undef __
61 #ifdef PRODUCT
62 #define __ _masm->
63 #else
64 #define __ _masm->
65 // #define __ (Verbose ? (_masm->block_comment(FILE_AND_LINE),_masm):_masm)->
66 #endif
67
68 #define BLOCK_COMMENT(str) __ block_comment(str)
69 #define BIND(label) __ bind(label); BLOCK_COMMENT(#label ":")
70
71 #define oop_tmp_offset _z_ijava_state_neg(oop_tmp)
72
73 //-----------------------------------------------------------------------------
74
generate_slow_signature_handler()75 address TemplateInterpreterGenerator::generate_slow_signature_handler() {
76 //
77 // New slow_signature handler that respects the z/Architecture
78 // C calling conventions.
79 //
80 // We get called by the native entry code with our output register
81 // area == 8. First we call InterpreterRuntime::get_result_handler
82 // to copy the pointer to the signature string temporarily to the
83 // first C-argument and to return the result_handler in
84 // Z_RET. Since native_entry will copy the jni-pointer to the
85 // first C-argument slot later on, it's OK to occupy this slot
86 // temporarily. Then we copy the argument list on the java
87 // expression stack into native varargs format on the native stack
88 // and load arguments into argument registers. Integer arguments in
89 // the varargs vector will be sign-extended to 8 bytes.
90 //
91 // On entry:
92 // Z_ARG1 - intptr_t* Address of java argument list in memory.
93 // Z_state - zeroInterpreter* Address of interpreter state for
94 // this method
95 // Z_method
96 //
97 // On exit (just before return instruction):
98 // Z_RET contains the address of the result_handler.
99 // Z_ARG2 is not updated for static methods and contains "this" otherwise.
100 // Z_ARG3-Z_ARG5 contain the first 3 arguments of types other than float and double.
101 // Z_FARG1-Z_FARG4 contain the first 4 arguments of type float or double.
102
103 const int LogSizeOfCase = 3;
104
105 const int max_fp_register_arguments = Argument::n_float_register_parameters;
106 const int max_int_register_arguments = Argument::n_register_parameters - 2; // First 2 are reserved.
107
108 const Register arg_java = Z_tmp_2;
109 const Register arg_c = Z_tmp_3;
110 const Register signature = Z_R1_scratch; // Is a string.
111 const Register fpcnt = Z_R0_scratch;
112 const Register argcnt = Z_tmp_4;
113 const Register intSlot = Z_tmp_1;
114 const Register sig_end = Z_tmp_1; // Assumed end of signature (only used in do_object).
115 const Register target_sp = Z_tmp_1;
116 const FloatRegister floatSlot = Z_F1;
117
118 const int d_signature = _z_abi(gpr6); // Only spill space, register contents not affected.
119 const int d_fpcnt = _z_abi(gpr7); // Only spill space, register contents not affected.
120
121 unsigned int entry_offset = __ offset();
122
123 BLOCK_COMMENT("slow_signature_handler {");
124
125 // We use target_sp for storing arguments in the C frame.
126 __ save_return_pc();
127 __ push_frame_abi160(4*BytesPerWord); // Reserve space to save the tmp_[1..4] registers.
128 __ z_stmg(Z_R10, Z_R13, frame::z_abi_160_size, Z_SP); // Save registers only after frame is pushed.
129
130 __ z_lgr(arg_java, Z_ARG1);
131
132 Register method = Z_ARG2; // Directly load into correct argument register.
133
134 __ get_method(method);
135 __ call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::get_signature), Z_thread, method);
136
137 // Move signature to callee saved register.
138 // Don't directly write to stack. Frame is used by VM call.
139 __ z_lgr(Z_tmp_1, Z_RET);
140
141 // Reload method. Register may have been altered by VM call.
142 __ get_method(method);
143
144 // Get address of result handler.
145 __ call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::get_result_handler), Z_thread, method);
146
147 // Save signature address to stack.
148 __ z_stg(Z_tmp_1, d_signature, Z_SP);
149
150 // Don't overwrite return value (Z_RET, Z_ARG1) in rest of the method !
151
152 {
153 Label isStatic;
154
155 // Test if static.
156 // We can test the bit directly.
157 // Path is Z_method->_access_flags._flags.
158 // We only support flag bits in the least significant byte (assert !).
159 // Therefore add 3 to address that byte within "_flags".
160 // Reload method. VM call above may have destroyed register contents
161 __ get_method(method);
162 __ testbit(method2_(method, access_flags), JVM_ACC_STATIC_BIT);
163 method = noreg; // end of life
164 __ z_btrue(isStatic);
165
166 // For non-static functions, pass "this" in Z_ARG2 and copy it to 2nd C-arg slot.
167 // Need to box the Java object here, so we use arg_java
168 // (address of current Java stack slot) as argument and
169 // don't dereference it as in case of ints, floats, etc..
170 __ z_lgr(Z_ARG2, arg_java);
171 __ add2reg(arg_java, -BytesPerWord);
172 __ bind(isStatic);
173 }
174
175 // argcnt == 0 corresponds to 3rd C argument.
176 // arg #1 (result handler) and
177 // arg #2 (this, for non-statics), unused else
178 // are reserved and pre-filled above.
179 // arg_java points to the corresponding Java argument here. It
180 // has been decremented by one argument (this) in case of non-static.
181 __ clear_reg(argcnt, true, false); // Don't set CC.
182 __ z_lg(target_sp, 0, Z_SP);
183 __ add2reg(arg_c, _z_abi(remaining_cargs), target_sp);
184 // No floating-point args parsed so far.
185 __ clear_mem(Address(Z_SP, d_fpcnt), 8);
186
187 NearLabel move_intSlot_to_ARG, move_floatSlot_to_FARG;
188 NearLabel loop_start, loop_start_restore, loop_end;
189 NearLabel do_int, do_long, do_float, do_double;
190 NearLabel do_dontreachhere, do_object, do_array, do_boxed;
191
192 #ifdef ASSERT
193 // Signature needs to point to '(' (== 0x28) at entry.
194 __ z_lg(signature, d_signature, Z_SP);
195 __ z_cli(0, signature, (int) '(');
196 __ z_brne(do_dontreachhere);
197 #endif
198
199 __ bind(loop_start_restore);
200 __ z_lg(signature, d_signature, Z_SP); // Restore signature ptr, destroyed by move_XX_to_ARG.
201
202 BIND(loop_start);
203 // Advance to next argument type token from the signature.
204 __ add2reg(signature, 1);
205
206 // Use CLI, works well on all CPU versions.
207 __ z_cli(0, signature, (int) ')');
208 __ z_bre(loop_end); // end of signature
209 __ z_cli(0, signature, (int) 'L');
210 __ z_bre(do_object); // object #9
211 __ z_cli(0, signature, (int) 'F');
212 __ z_bre(do_float); // float #7
213 __ z_cli(0, signature, (int) 'J');
214 __ z_bre(do_long); // long #6
215 __ z_cli(0, signature, (int) 'B');
216 __ z_bre(do_int); // byte #1
217 __ z_cli(0, signature, (int) 'Z');
218 __ z_bre(do_int); // boolean #2
219 __ z_cli(0, signature, (int) 'C');
220 __ z_bre(do_int); // char #3
221 __ z_cli(0, signature, (int) 'S');
222 __ z_bre(do_int); // short #4
223 __ z_cli(0, signature, (int) 'I');
224 __ z_bre(do_int); // int #5
225 __ z_cli(0, signature, (int) 'D');
226 __ z_bre(do_double); // double #8
227 __ z_cli(0, signature, (int) '[');
228 __ z_bre(do_array); // array #10
229
230 __ bind(do_dontreachhere);
231
232 __ unimplemented("ShouldNotReachHere in slow_signature_handler", 120);
233
234 // Array argument
235 BIND(do_array);
236
237 {
238 Label start_skip, end_skip;
239
240 __ bind(start_skip);
241
242 // Advance to next type tag from signature.
243 __ add2reg(signature, 1);
244
245 // Use CLI, works well on all CPU versions.
246 __ z_cli(0, signature, (int) '[');
247 __ z_bre(start_skip); // Skip further brackets.
248
249 __ z_cli(0, signature, (int) '9');
250 __ z_brh(end_skip); // no optional size
251
252 __ z_cli(0, signature, (int) '0');
253 __ z_brnl(start_skip); // Skip optional size.
254
255 __ bind(end_skip);
256
257 __ z_cli(0, signature, (int) 'L');
258 __ z_brne(do_boxed); // If not array of objects: go directly to do_boxed.
259 }
260
261 // OOP argument
262 BIND(do_object);
263 // Pass by an object's type name.
264 {
265 Label L;
266
267 __ add2reg(sig_end, 4095, signature); // Assume object type name is shorter than 4k.
268 __ load_const_optimized(Z_R0, (int) ';'); // Type name terminator (must be in Z_R0!).
269 __ MacroAssembler::search_string(sig_end, signature);
270 __ z_brl(L);
271 __ z_illtrap(); // No semicolon found: internal error or object name too long.
272 __ bind(L);
273 __ z_lgr(signature, sig_end);
274 // fallthru to do_boxed
275 }
276
277 // Need to box the Java object here, so we use arg_java
278 // (address of current Java stack slot) as argument and
279 // don't dereference it as in case of ints, floats, etc..
280
281 // UNBOX argument
282 // Load reference and check for NULL.
283 Label do_int_Entry4Boxed;
284 __ bind(do_boxed);
285 {
286 __ load_and_test_long(intSlot, Address(arg_java));
287 __ z_bre(do_int_Entry4Boxed);
288 __ z_lgr(intSlot, arg_java);
289 __ z_bru(do_int_Entry4Boxed);
290 }
291
292 // INT argument
293
294 // (also for byte, boolean, char, short)
295 // Use lgf for load (sign-extend) and stg for store.
296 BIND(do_int);
297 __ z_lgf(intSlot, 0, arg_java);
298
299 __ bind(do_int_Entry4Boxed);
300 __ add2reg(arg_java, -BytesPerWord);
301 // If argument fits into argument register, go and handle it, otherwise continue.
302 __ compare32_and_branch(argcnt, max_int_register_arguments,
303 Assembler::bcondLow, move_intSlot_to_ARG);
304 __ z_stg(intSlot, 0, arg_c);
305 __ add2reg(arg_c, BytesPerWord);
306 __ z_bru(loop_start);
307
308 // LONG argument
309
310 BIND(do_long);
311 __ add2reg(arg_java, -2*BytesPerWord); // Decrement first to have positive displacement for lg.
312 __ z_lg(intSlot, BytesPerWord, arg_java);
313 // If argument fits into argument register, go and handle it, otherwise continue.
314 __ compare32_and_branch(argcnt, max_int_register_arguments,
315 Assembler::bcondLow, move_intSlot_to_ARG);
316 __ z_stg(intSlot, 0, arg_c);
317 __ add2reg(arg_c, BytesPerWord);
318 __ z_bru(loop_start);
319
320 // FLOAT argumen
321
322 BIND(do_float);
323 __ z_le(floatSlot, 0, arg_java);
324 __ add2reg(arg_java, -BytesPerWord);
325 assert(max_fp_register_arguments <= 255, "always true"); // safety net
326 __ z_cli(d_fpcnt+7, Z_SP, max_fp_register_arguments);
327 __ z_brl(move_floatSlot_to_FARG);
328 __ z_ste(floatSlot, 4, arg_c);
329 __ add2reg(arg_c, BytesPerWord);
330 __ z_bru(loop_start);
331
332 // DOUBLE argument
333
334 BIND(do_double);
335 __ add2reg(arg_java, -2*BytesPerWord); // Decrement first to have positive displacement for lg.
336 __ z_ld(floatSlot, BytesPerWord, arg_java);
337 assert(max_fp_register_arguments <= 255, "always true"); // safety net
338 __ z_cli(d_fpcnt+7, Z_SP, max_fp_register_arguments);
339 __ z_brl(move_floatSlot_to_FARG);
340 __ z_std(floatSlot, 0, arg_c);
341 __ add2reg(arg_c, BytesPerWord);
342 __ z_bru(loop_start);
343
344 // Method exit, all arguments proocessed.
345 __ bind(loop_end);
346 __ z_lmg(Z_R10, Z_R13, frame::z_abi_160_size, Z_SP); // restore registers before frame is popped.
347 __ pop_frame();
348 __ restore_return_pc();
349 __ z_br(Z_R14);
350
351 // Copy int arguments.
352
353 Label iarg_caselist; // Distance between each case has to be a power of 2
354 // (= 1 << LogSizeOfCase).
355 __ align(16);
356 BIND(iarg_caselist);
357 __ z_lgr(Z_ARG3, intSlot); // 4 bytes
358 __ z_bru(loop_start_restore); // 4 bytes
359
360 __ z_lgr(Z_ARG4, intSlot);
361 __ z_bru(loop_start_restore);
362
363 __ z_lgr(Z_ARG5, intSlot);
364 __ z_bru(loop_start_restore);
365
366 __ align(16);
367 __ bind(move_intSlot_to_ARG);
368 __ z_stg(signature, d_signature, Z_SP); // Spill since signature == Z_R1_scratch.
369 __ z_larl(Z_R1_scratch, iarg_caselist);
370 __ z_sllg(Z_R0_scratch, argcnt, LogSizeOfCase);
371 __ add2reg(argcnt, 1);
372 __ z_agr(Z_R1_scratch, Z_R0_scratch);
373 __ z_bcr(Assembler::bcondAlways, Z_R1_scratch);
374
375 // Copy float arguments.
376
377 Label farg_caselist; // Distance between each case has to be a power of 2
378 // (= 1 << logSizeOfCase, padded with nop.
379 __ align(16);
380 BIND(farg_caselist);
381 __ z_ldr(Z_FARG1, floatSlot); // 2 bytes
382 __ z_bru(loop_start_restore); // 4 bytes
383 __ z_nop(); // 2 bytes
384
385 __ z_ldr(Z_FARG2, floatSlot);
386 __ z_bru(loop_start_restore);
387 __ z_nop();
388
389 __ z_ldr(Z_FARG3, floatSlot);
390 __ z_bru(loop_start_restore);
391 __ z_nop();
392
393 __ z_ldr(Z_FARG4, floatSlot);
394 __ z_bru(loop_start_restore);
395 __ z_nop();
396
397 __ align(16);
398 __ bind(move_floatSlot_to_FARG);
399 __ z_stg(signature, d_signature, Z_SP); // Spill since signature == Z_R1_scratch.
400 __ z_lg(Z_R0_scratch, d_fpcnt, Z_SP); // Need old value for indexing.
401 __ add2mem_64(Address(Z_SP, d_fpcnt), 1, Z_R1_scratch); // Increment index.
402 __ z_larl(Z_R1_scratch, farg_caselist);
403 __ z_sllg(Z_R0_scratch, Z_R0_scratch, LogSizeOfCase);
404 __ z_agr(Z_R1_scratch, Z_R0_scratch);
405 __ z_bcr(Assembler::bcondAlways, Z_R1_scratch);
406
407 BLOCK_COMMENT("} slow_signature_handler");
408
409 return __ addr_at(entry_offset);
410 }
411
generate_result_handler_for(BasicType type)412 address TemplateInterpreterGenerator::generate_result_handler_for (BasicType type) {
413 address entry = __ pc();
414
415 assert(Z_tos == Z_RET, "Result handler: must move result!");
416 assert(Z_ftos == Z_FRET, "Result handler: must move float result!");
417
418 switch (type) {
419 case T_BOOLEAN:
420 __ c2bool(Z_tos);
421 break;
422 case T_CHAR:
423 __ and_imm(Z_tos, 0xffff);
424 break;
425 case T_BYTE:
426 __ z_lbr(Z_tos, Z_tos);
427 break;
428 case T_SHORT:
429 __ z_lhr(Z_tos, Z_tos);
430 break;
431 case T_INT:
432 case T_LONG:
433 case T_VOID:
434 case T_FLOAT:
435 case T_DOUBLE:
436 break;
437 case T_OBJECT:
438 // Retrieve result from frame...
439 __ mem2reg_opt(Z_tos, Address(Z_fp, oop_tmp_offset));
440 // and verify it.
441 __ verify_oop(Z_tos);
442 break;
443 default:
444 ShouldNotReachHere();
445 }
446 __ z_br(Z_R14); // Return from result handler.
447 return entry;
448 }
449
450 // Abstract method entry.
451 // Attempt to execute abstract method. Throw exception.
generate_abstract_entry(void)452 address TemplateInterpreterGenerator::generate_abstract_entry(void) {
453 unsigned int entry_offset = __ offset();
454
455 // Caller could be the call_stub or a compiled method (x86 version is wrong!).
456
457 BLOCK_COMMENT("abstract_entry {");
458
459 // Implement call of InterpreterRuntime::throw_AbstractMethodError.
460 __ set_top_ijava_frame_at_SP_as_last_Java_frame(Z_SP, Z_R1);
461 __ save_return_pc(); // Save Z_R14.
462 __ push_frame_abi160(0); // Without new frame the RT call could overwrite the saved Z_R14.
463
464 __ call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_AbstractMethodErrorWithMethod),
465 Z_thread, Z_method);
466
467 __ pop_frame();
468 __ restore_return_pc(); // Restore Z_R14.
469 __ reset_last_Java_frame();
470
471 // Restore caller sp for c2i case.
472 __ resize_frame_absolute(Z_R10, Z_R0, true); // Cut the stack back to where the caller started.
473
474 // branch to SharedRuntime::generate_forward_exception() which handles all possible callers,
475 // i.e. call stub, compiled method, interpreted method.
476 __ load_absolute_address(Z_tmp_1, StubRoutines::forward_exception_entry());
477 __ z_br(Z_tmp_1);
478
479 BLOCK_COMMENT("} abstract_entry");
480
481 return __ addr_at(entry_offset);
482 }
483
generate_Reference_get_entry(void)484 address TemplateInterpreterGenerator::generate_Reference_get_entry(void) {
485 // Inputs:
486 // Z_ARG1 - receiver
487 //
488 // What we do:
489 // - Load the referent field address.
490 // - Load the value in the referent field.
491 // - Pass that value to the pre-barrier.
492 //
493 // In the case of G1 this will record the value of the
494 // referent in an SATB buffer if marking is active.
495 // This will cause concurrent marking to mark the referent
496 // field as live.
497
498 Register scratch1 = Z_tmp_2;
499 Register scratch2 = Z_tmp_3;
500 Register pre_val = Z_RET; // return value
501 // Z_esp is callers operand stack pointer, i.e. it points to the parameters.
502 Register Rargp = Z_esp;
503
504 Label slow_path;
505 address entry = __ pc();
506
507 const int referent_offset = java_lang_ref_Reference::referent_offset();
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, Address(pre_val, referent_offset), scratch1, scratch2, ON_WEAK_OOP_REF);
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 __ z_br(Z_R14);
521
522 // Branch to previously generated regular method entry.
523 __ bind(slow_path);
524
525 address meth_entry = Interpreter::entry_for_kind(Interpreter::zerolocals);
526 __ jump_to_entry(meth_entry, Z_R1);
527
528 BLOCK_COMMENT("} Reference_get");
529
530 return entry;
531 }
532
generate_StackOverflowError_handler()533 address TemplateInterpreterGenerator::generate_StackOverflowError_handler() {
534 address entry = __ pc();
535
536 DEBUG_ONLY(__ verify_esp(Z_esp, Z_ARG5));
537
538 // Restore bcp under the assumption that the current frame is still
539 // interpreted.
540 __ restore_bcp();
541
542 // Expression stack must be empty before entering the VM if an
543 // exception happened.
544 __ empty_expression_stack();
545 // Throw exception.
546 __ call_VM(noreg,
547 CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_StackOverflowError));
548 return entry;
549 }
550
551 //
552 // Args:
553 // Z_ARG2: oop of array
554 // Z_ARG3: aberrant index
555 //
generate_ArrayIndexOutOfBounds_handler()556 address TemplateInterpreterGenerator::generate_ArrayIndexOutOfBounds_handler() {
557 address entry = __ pc();
558 address excp = CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_ArrayIndexOutOfBoundsException);
559
560 // Expression stack must be empty before entering the VM if an
561 // exception happened.
562 __ empty_expression_stack();
563
564 // Setup parameters.
565 // Pass register with array to create more detailed exceptions.
566 __ call_VM(noreg, excp, Z_ARG2, Z_ARG3);
567 return entry;
568 }
569
generate_ClassCastException_handler()570 address TemplateInterpreterGenerator::generate_ClassCastException_handler() {
571 address entry = __ pc();
572
573 // Object is at TOS.
574 __ pop_ptr(Z_ARG2);
575
576 // Expression stack must be empty before entering the VM if an
577 // exception happened.
578 __ empty_expression_stack();
579
580 __ call_VM(Z_ARG1,
581 CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_ClassCastException),
582 Z_ARG2);
583
584 DEBUG_ONLY(__ should_not_reach_here();)
585
586 return entry;
587 }
588
generate_exception_handler_common(const char * name,const char * message,bool pass_oop)589 address TemplateInterpreterGenerator::generate_exception_handler_common(const char* name, const char* message, bool pass_oop) {
590 assert(!pass_oop || message == NULL, "either oop or message but not both");
591 address entry = __ pc();
592
593 BLOCK_COMMENT("exception_handler_common {");
594
595 // Expression stack must be empty before entering the VM if an
596 // exception happened.
597 __ empty_expression_stack();
598 if (name != NULL) {
599 __ load_absolute_address(Z_ARG2, (address)name);
600 } else {
601 __ clear_reg(Z_ARG2, true, false);
602 }
603
604 if (pass_oop) {
605 __ call_VM(Z_tos,
606 CAST_FROM_FN_PTR(address, InterpreterRuntime::create_klass_exception),
607 Z_ARG2, Z_tos /*object (see TT::aastore())*/);
608 } else {
609 if (message != NULL) {
610 __ load_absolute_address(Z_ARG3, (address)message);
611 } else {
612 __ clear_reg(Z_ARG3, true, false);
613 }
614 __ call_VM(Z_tos,
615 CAST_FROM_FN_PTR(address, InterpreterRuntime::create_exception),
616 Z_ARG2, Z_ARG3);
617 }
618 // Throw exception.
619 __ load_absolute_address(Z_R1_scratch, Interpreter::throw_exception_entry());
620 __ z_br(Z_R1_scratch);
621
622 BLOCK_COMMENT("} exception_handler_common");
623
624 return entry;
625 }
626
generate_return_entry_for(TosState state,int step,size_t index_size)627 address TemplateInterpreterGenerator::generate_return_entry_for (TosState state, int step, size_t index_size) {
628 address entry = __ pc();
629
630 BLOCK_COMMENT("return_entry {");
631
632 // Pop i2c extension or revert top-2-parent-resize done by interpreted callees.
633 Register sp_before_i2c_extension = Z_bcp;
634 __ z_lg(Z_fp, _z_abi(callers_sp), Z_SP); // Restore frame pointer.
635 __ z_lg(sp_before_i2c_extension, Address(Z_fp, _z_ijava_state_neg(top_frame_sp)));
636 __ resize_frame_absolute(sp_before_i2c_extension, Z_locals/*tmp*/, true/*load_fp*/);
637
638 // TODO(ZASM): necessary??
639 // // and NULL it as marker that esp is now tos until next java call
640 // __ movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), (int32_t)NULL_WORD);
641
642 __ restore_bcp();
643 __ restore_locals();
644 __ restore_esp();
645
646 if (state == atos) {
647 __ profile_return_type(Z_tmp_1, Z_tos, Z_tmp_2);
648 }
649
650 Register cache = Z_tmp_1;
651 Register size = Z_tmp_1;
652 Register offset = Z_tmp_2;
653 const int flags_offset = in_bytes(ConstantPoolCache::base_offset() +
654 ConstantPoolCacheEntry::flags_offset());
655 __ get_cache_and_index_at_bcp(cache, offset, 1, index_size);
656
657 // #args is in rightmost byte of the _flags field.
658 __ z_llgc(size, Address(cache, offset, flags_offset+(sizeof(size_t)-1)));
659 __ z_sllg(size, size, Interpreter::logStackElementSize); // Each argument size in bytes.
660 __ z_agr(Z_esp, size); // Pop arguments.
661
662 __ check_and_handle_popframe(Z_thread);
663 __ check_and_handle_earlyret(Z_thread);
664
665 __ dispatch_next(state, step);
666
667 BLOCK_COMMENT("} return_entry");
668
669 return entry;
670 }
671
generate_deopt_entry_for(TosState state,int step,address continuation)672 address TemplateInterpreterGenerator::generate_deopt_entry_for(TosState state,
673 int step,
674 address continuation) {
675 address entry = __ pc();
676
677 BLOCK_COMMENT("deopt_entry {");
678
679 // TODO(ZASM): necessary? NULL last_sp until next java call
680 // __ movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), (int32_t)NULL_WORD);
681 __ z_lg(Z_fp, _z_abi(callers_sp), Z_SP); // Restore frame pointer.
682 __ restore_bcp();
683 __ restore_locals();
684 __ restore_esp();
685
686 // Handle exceptions.
687 {
688 Label L;
689 __ load_and_test_long(Z_R0/*pending_exception*/, thread_(pending_exception));
690 __ z_bre(L);
691 __ call_VM(noreg,
692 CAST_FROM_FN_PTR(address,
693 InterpreterRuntime::throw_pending_exception));
694 __ should_not_reach_here();
695 __ bind(L);
696 }
697 if (continuation == NULL) {
698 __ dispatch_next(state, step);
699 } else {
700 __ jump_to_entry(continuation, Z_R1_scratch);
701 }
702
703 BLOCK_COMMENT("} deopt_entry");
704
705 return entry;
706 }
707
generate_safept_entry_for(TosState state,address runtime_entry)708 address TemplateInterpreterGenerator::generate_safept_entry_for (TosState state,
709 address runtime_entry) {
710 address entry = __ pc();
711 __ push(state);
712 __ call_VM(noreg, runtime_entry);
713 __ dispatch_via(vtos, Interpreter::_normal_table.table_for (vtos));
714 return entry;
715 }
716
717 //
718 // Helpers for commoning out cases in the various type of method entries.
719 //
720
721 // Increment invocation count & check for overflow.
722 //
723 // Note: checking for negative value instead of overflow
724 // so we have a 'sticky' overflow test.
725 //
726 // Z_ARG2: method (see generate_fixed_frame())
727 //
generate_counter_incr(Label * overflow,Label * profile_method,Label * profile_method_continue)728 void TemplateInterpreterGenerator::generate_counter_incr(Label* overflow, Label* profile_method, Label* profile_method_continue) {
729 Label done;
730 Register method = Z_ARG2; // Generate_fixed_frame() copies Z_method into Z_ARG2.
731 Register m_counters = Z_ARG4;
732
733 BLOCK_COMMENT("counter_incr {");
734
735 // Note: In tiered we increment either counters in method or in MDO depending
736 // if we are profiling or not.
737 if (TieredCompilation) {
738 int increment = InvocationCounter::count_increment;
739 if (ProfileInterpreter) {
740 NearLabel no_mdo;
741 Register mdo = m_counters;
742 // Are we profiling?
743 __ load_and_test_long(mdo, method2_(method, method_data));
744 __ branch_optimized(Assembler::bcondZero, no_mdo);
745 // Increment counter in the MDO.
746 const Address mdo_invocation_counter(mdo, MethodData::invocation_counter_offset() +
747 InvocationCounter::counter_offset());
748 const Address mask(mdo, MethodData::invoke_mask_offset());
749 __ increment_mask_and_jump(mdo_invocation_counter, increment, mask,
750 Z_R1_scratch, false, Assembler::bcondZero,
751 overflow);
752 __ z_bru(done);
753 __ bind(no_mdo);
754 }
755
756 // Increment counter in MethodCounters.
757 const Address invocation_counter(m_counters,
758 MethodCounters::invocation_counter_offset() +
759 InvocationCounter::counter_offset());
760 // Get address of MethodCounters object.
761 __ get_method_counters(method, m_counters, done);
762 const Address mask(m_counters, MethodCounters::invoke_mask_offset());
763 __ increment_mask_and_jump(invocation_counter,
764 increment, mask,
765 Z_R1_scratch, false, Assembler::bcondZero,
766 overflow);
767 } else {
768 Register counter_sum = Z_ARG3; // The result of this piece of code.
769 Register tmp = Z_R1_scratch;
770 #ifdef ASSERT
771 {
772 NearLabel ok;
773 __ get_method(tmp);
774 __ compare64_and_branch(method, tmp, Assembler::bcondEqual, ok);
775 __ z_illtrap(0x66);
776 __ bind(ok);
777 }
778 #endif
779
780 // Get address of MethodCounters object.
781 __ get_method_counters(method, m_counters, done);
782 // Update standard invocation counters.
783 __ increment_invocation_counter(m_counters, counter_sum);
784 if (ProfileInterpreter) {
785 __ add2mem_32(Address(m_counters, MethodCounters::interpreter_invocation_counter_offset()), 1, tmp);
786 if (profile_method != NULL) {
787 const Address profile_limit(m_counters, MethodCounters::interpreter_profile_limit_offset());
788 __ z_cl(counter_sum, profile_limit);
789 __ branch_optimized(Assembler::bcondLow, *profile_method_continue);
790 // If no method data exists, go to profile_method.
791 __ test_method_data_pointer(tmp, *profile_method);
792 }
793 }
794
795 const Address invocation_limit(m_counters, MethodCounters::interpreter_invocation_limit_offset());
796 __ z_cl(counter_sum, invocation_limit);
797 __ branch_optimized(Assembler::bcondNotLow, *overflow);
798 }
799
800 __ bind(done);
801
802 BLOCK_COMMENT("} counter_incr");
803 }
804
generate_counter_overflow(Label & do_continue)805 void TemplateInterpreterGenerator::generate_counter_overflow(Label& do_continue) {
806 // InterpreterRuntime::frequency_counter_overflow takes two
807 // arguments, the first (thread) is passed by call_VM, the second
808 // indicates if the counter overflow occurs at a backwards branch
809 // (NULL bcp). We pass zero for it. The call returns the address
810 // of the verified entry point for the method or NULL if the
811 // compilation did not complete (either went background or bailed
812 // out).
813 __ clear_reg(Z_ARG2);
814 __ call_VM(noreg,
815 CAST_FROM_FN_PTR(address, InterpreterRuntime::frequency_counter_overflow),
816 Z_ARG2);
817 __ z_bru(do_continue);
818 }
819
generate_stack_overflow_check(Register frame_size,Register tmp1)820 void TemplateInterpreterGenerator::generate_stack_overflow_check(Register frame_size, Register tmp1) {
821 Register tmp2 = Z_R1_scratch;
822 const int page_size = os::vm_page_size();
823 NearLabel after_frame_check;
824
825 BLOCK_COMMENT("stack_overflow_check {");
826
827 assert_different_registers(frame_size, tmp1);
828
829 // Stack banging is sufficient overflow check if frame_size < page_size.
830 if (Immediate::is_uimm(page_size, 15)) {
831 __ z_chi(frame_size, page_size);
832 __ z_brl(after_frame_check);
833 } else {
834 __ load_const_optimized(tmp1, page_size);
835 __ compareU32_and_branch(frame_size, tmp1, Assembler::bcondLow, after_frame_check);
836 }
837
838 // Get the stack base, and in debug, verify it is non-zero.
839 __ z_lg(tmp1, thread_(stack_base));
840 #ifdef ASSERT
841 address reentry = NULL;
842 NearLabel base_not_zero;
843 __ compareU64_and_branch(tmp1, (intptr_t)0L, Assembler::bcondNotEqual, base_not_zero);
844 reentry = __ stop_chain_static(reentry, "stack base is zero in generate_stack_overflow_check");
845 __ bind(base_not_zero);
846 #endif
847
848 // Get the stack size, and in debug, verify it is non-zero.
849 assert(sizeof(size_t) == sizeof(intptr_t), "wrong load size");
850 __ z_lg(tmp2, thread_(stack_size));
851 #ifdef ASSERT
852 NearLabel size_not_zero;
853 __ compareU64_and_branch(tmp2, (intptr_t)0L, Assembler::bcondNotEqual, size_not_zero);
854 reentry = __ stop_chain_static(reentry, "stack size is zero in generate_stack_overflow_check");
855 __ bind(size_not_zero);
856 #endif
857
858 // Compute the beginning of the protected zone minus the requested frame size.
859 __ z_sgr(tmp1, tmp2);
860 __ add2reg(tmp1, StackOverflow::stack_guard_zone_size());
861
862 // Add in the size of the frame (which is the same as subtracting it from the
863 // SP, which would take another register.
864 __ z_agr(tmp1, frame_size);
865
866 // The frame is greater than one page in size, so check against
867 // the bottom of the stack.
868 __ compareU64_and_branch(Z_SP, tmp1, Assembler::bcondHigh, after_frame_check);
869
870 // The stack will overflow, throw an exception.
871
872 // Restore SP to sender's sp. This is necessary if the sender's frame is an
873 // extended compiled frame (see gen_c2i_adapter()) and safer anyway in case of
874 // JSR292 adaptations.
875 __ resize_frame_absolute(Z_R10, tmp1, true/*load_fp*/);
876
877 // Note also that the restored frame is not necessarily interpreted.
878 // Use the shared runtime version of the StackOverflowError.
879 assert(StubRoutines::throw_StackOverflowError_entry() != NULL, "stub not yet generated");
880 AddressLiteral stub(StubRoutines::throw_StackOverflowError_entry());
881 __ load_absolute_address(tmp1, StubRoutines::throw_StackOverflowError_entry());
882 __ z_br(tmp1);
883
884 // If you get to here, then there is enough stack space.
885 __ bind(after_frame_check);
886
887 BLOCK_COMMENT("} stack_overflow_check");
888 }
889
890 // Allocate monitor and lock method (asm interpreter).
891 //
892 // Args:
893 // Z_locals: locals
894
lock_method(void)895 void TemplateInterpreterGenerator::lock_method(void) {
896
897 BLOCK_COMMENT("lock_method {");
898
899 // Synchronize method.
900 const Register method = Z_tmp_2;
901 __ get_method(method);
902
903 #ifdef ASSERT
904 address reentry = NULL;
905 {
906 Label L;
907 __ testbit(method2_(method, access_flags), JVM_ACC_SYNCHRONIZED_BIT);
908 __ z_btrue(L);
909 reentry = __ stop_chain_static(reentry, "method doesn't need synchronization");
910 __ bind(L);
911 }
912 #endif // ASSERT
913
914 // Get synchronization object.
915 const Register object = Z_tmp_2;
916
917 {
918 Label done;
919 Label static_method;
920
921 __ testbit(method2_(method, access_flags), JVM_ACC_STATIC_BIT);
922 __ z_btrue(static_method);
923
924 // non-static method: Load receiver obj from stack.
925 __ mem2reg_opt(object, Address(Z_locals, Interpreter::local_offset_in_bytes(0)));
926 __ z_bru(done);
927
928 __ bind(static_method);
929
930 // Lock the java mirror.
931 // Load mirror from interpreter frame.
932 __ z_lg(object, _z_ijava_state_neg(mirror), Z_fp);
933
934 #ifdef ASSERT
935 {
936 NearLabel L;
937 __ compare64_and_branch(object, (intptr_t) 0, Assembler::bcondNotEqual, L);
938 reentry = __ stop_chain_static(reentry, "synchronization object is NULL");
939 __ bind(L);
940 }
941 #endif // ASSERT
942
943 __ bind(done);
944 }
945
946 __ add_monitor_to_stack(true, Z_ARG3, Z_ARG4, Z_ARG5); // Allocate monitor elem.
947 // Store object and lock it.
948 __ get_monitors(Z_tmp_1);
949 __ reg2mem_opt(object, Address(Z_tmp_1, BasicObjectLock::obj_offset_in_bytes()));
950 __ lock_object(Z_tmp_1, object);
951
952 BLOCK_COMMENT("} lock_method");
953 }
954
955 // Generate a fixed interpreter frame. This is identical setup for
956 // interpreted methods and for native methods hence the shared code.
957 //
958 // Registers alive
959 // Z_thread - JavaThread*
960 // Z_SP - old stack pointer
961 // Z_method - callee's method
962 // Z_esp - parameter list (slot 'above' last param)
963 // Z_R14 - return pc, to be stored in caller's frame
964 // Z_R10 - sender sp, note: Z_tmp_1 is Z_R10!
965 //
966 // Registers updated
967 // Z_SP - new stack pointer
968 // Z_esp - callee's operand stack pointer
969 // points to the slot above the value on top
970 // Z_locals - used to access locals: locals[i] := *(Z_locals - i*BytesPerWord)
971 // Z_bcp - the bytecode pointer
972 // Z_fp - the frame pointer, thereby killing Z_method
973 // Z_ARG2 - copy of Z_method
974 //
generate_fixed_frame(bool native_call)975 void TemplateInterpreterGenerator::generate_fixed_frame(bool native_call) {
976
977 // stack layout
978 //
979 // F1 [TOP_IJAVA_FRAME_ABI] <-- Z_SP, Z_R10 (see note below)
980 // [F1's operand stack (unused)]
981 // [F1's outgoing Java arguments] <-- Z_esp
982 // [F1's operand stack (non args)]
983 // [monitors] (optional)
984 // [IJAVA_STATE]
985 //
986 // F2 [PARENT_IJAVA_FRAME_ABI]
987 // ...
988 //
989 // 0x000
990 //
991 // Note: Z_R10, the sender sp, will be below Z_SP if F1 was extended by a c2i adapter.
992
993 //=============================================================================
994 // Allocate space for locals other than the parameters, the
995 // interpreter state, monitors, and the expression stack.
996
997 const Register local_count = Z_ARG5;
998 const Register fp = Z_tmp_2;
999 const Register const_method = Z_ARG1;
1000
1001 BLOCK_COMMENT("generate_fixed_frame {");
1002 {
1003 // local registers
1004 const Register top_frame_size = Z_ARG2;
1005 const Register sp_after_resize = Z_ARG3;
1006 const Register max_stack = Z_ARG4;
1007
1008 __ z_lg(const_method, Address(Z_method, Method::const_offset()));
1009 __ z_llgh(max_stack, Address(const_method, ConstMethod::size_of_parameters_offset()));
1010 __ z_sllg(Z_locals /*parameter_count bytes*/, max_stack /*parameter_count*/, LogBytesPerWord);
1011
1012 if (native_call) {
1013 // If we're calling a native method, we replace max_stack (which is
1014 // zero) with space for the worst-case signature handler varargs
1015 // vector, which is:
1016 // max_stack = max(Argument::n_register_parameters, parameter_count+2);
1017 //
1018 // We add two slots to the parameter_count, one for the jni
1019 // environment and one for a possible native mirror. We allocate
1020 // space for at least the number of ABI registers, even though
1021 // InterpreterRuntime::slow_signature_handler won't write more than
1022 // parameter_count+2 words when it creates the varargs vector at the
1023 // top of the stack. The generated slow signature handler will just
1024 // load trash into registers beyond the necessary number. We're
1025 // still going to cut the stack back by the ABI register parameter
1026 // count so as to get SP+16 pointing at the ABI outgoing parameter
1027 // area, so we need to allocate at least that much even though we're
1028 // going to throw it away.
1029 //
1030 __ add2reg(max_stack, 2);
1031
1032 NearLabel passing_args_on_stack;
1033
1034 // max_stack in bytes
1035 __ z_sllg(max_stack, max_stack, LogBytesPerWord);
1036
1037 int argument_registers_in_bytes = Argument::n_register_parameters << LogBytesPerWord;
1038 __ compare64_and_branch(max_stack, argument_registers_in_bytes, Assembler::bcondNotLow, passing_args_on_stack);
1039
1040 __ load_const_optimized(max_stack, argument_registers_in_bytes);
1041
1042 __ bind(passing_args_on_stack);
1043 } else {
1044 // !native_call
1045 // local_count = method->constMethod->max_locals();
1046 __ z_llgh(local_count, Address(const_method, ConstMethod::size_of_locals_offset()));
1047
1048 // Calculate number of non-parameter locals (in slots):
1049 __ z_sgr(local_count, max_stack);
1050
1051 // max_stack = method->max_stack();
1052 __ z_llgh(max_stack, Address(const_method, ConstMethod::max_stack_offset()));
1053 // max_stack in bytes
1054 __ z_sllg(max_stack, max_stack, LogBytesPerWord);
1055 }
1056
1057 // Resize (i.e. normally shrink) the top frame F1 ...
1058 // F1 [TOP_IJAVA_FRAME_ABI] <-- Z_SP, Z_R10
1059 // F1's operand stack (free)
1060 // ...
1061 // F1's operand stack (free) <-- Z_esp
1062 // F1's outgoing Java arg m
1063 // ...
1064 // F1's outgoing Java arg 0
1065 // ...
1066 //
1067 // ... into a parent frame (Z_R10 holds F1's SP before any modification, see also above)
1068 //
1069 // +......................+
1070 // : : <-- Z_R10, saved below as F0's z_ijava_state.sender_sp
1071 // : :
1072 // F1 [PARENT_IJAVA_FRAME_ABI] <-- Z_SP \
1073 // F0's non arg local | = delta
1074 // ... |
1075 // F0's non arg local <-- Z_esp /
1076 // F1's outgoing Java arg m
1077 // ...
1078 // F1's outgoing Java arg 0
1079 // ...
1080 //
1081 // then push the new top frame F0.
1082 //
1083 // F0 [TOP_IJAVA_FRAME_ABI] = frame::z_top_ijava_frame_abi_size \
1084 // [operand stack] = max_stack | = top_frame_size
1085 // [IJAVA_STATE] = frame::z_ijava_state_size /
1086
1087 // sp_after_resize = Z_esp - delta
1088 //
1089 // delta = PARENT_IJAVA_FRAME_ABI + (locals_count - params_count)
1090
1091 __ add2reg(sp_after_resize, (Interpreter::stackElementSize) - (frame::z_parent_ijava_frame_abi_size), Z_esp);
1092 if (!native_call) {
1093 __ z_sllg(Z_R0_scratch, local_count, LogBytesPerWord); // Params have already been subtracted from local_count.
1094 __ z_slgr(sp_after_resize, Z_R0_scratch);
1095 }
1096
1097 // top_frame_size = TOP_IJAVA_FRAME_ABI + max_stack + size of interpreter state
1098 __ add2reg(top_frame_size,
1099 frame::z_top_ijava_frame_abi_size +
1100 frame::z_ijava_state_size,
1101 max_stack);
1102
1103 if (!native_call) {
1104 // Stack overflow check.
1105 // Native calls don't need the stack size check since they have no
1106 // expression stack and the arguments are already on the stack and
1107 // we only add a handful of words to the stack.
1108 Register frame_size = max_stack; // Reuse the register for max_stack.
1109 __ z_lgr(frame_size, Z_SP);
1110 __ z_sgr(frame_size, sp_after_resize);
1111 __ z_agr(frame_size, top_frame_size);
1112 generate_stack_overflow_check(frame_size, fp/*tmp1*/);
1113 }
1114
1115 DEBUG_ONLY(__ z_cg(Z_R14, _z_abi16(return_pc), Z_SP));
1116 __ asm_assert_eq("killed Z_R14", 0);
1117 __ resize_frame_absolute(sp_after_resize, fp, true);
1118 __ save_return_pc(Z_R14);
1119
1120 // ... and push the new frame F0.
1121 __ push_frame(top_frame_size, fp, true /*copy_sp*/, false);
1122 }
1123
1124 //=============================================================================
1125 // Initialize the new frame F0: initialize interpreter state.
1126
1127 {
1128 // locals
1129 const Register local_addr = Z_ARG4;
1130
1131 BLOCK_COMMENT("generate_fixed_frame: initialize interpreter state {");
1132
1133 #ifdef ASSERT
1134 // Set the magic number (using local_addr as tmp register).
1135 __ load_const_optimized(local_addr, frame::z_istate_magic_number);
1136 __ z_stg(local_addr, _z_ijava_state_neg(magic), fp);
1137 #endif
1138
1139 // Save sender SP from F1 (i.e. before it was potentially modified by an
1140 // adapter) into F0's interpreter state. We use it as well to revert
1141 // resizing the frame above.
1142 __ z_stg(Z_R10, _z_ijava_state_neg(sender_sp), fp);
1143
1144 // Load cp cache and save it at the end of this block.
1145 __ z_lg(Z_R1_scratch, Address(const_method, ConstMethod::constants_offset()));
1146 __ z_lg(Z_R1_scratch, Address(Z_R1_scratch, ConstantPool::cache_offset_in_bytes()));
1147
1148 // z_ijava_state->method = method;
1149 __ z_stg(Z_method, _z_ijava_state_neg(method), fp);
1150
1151 // Point locals at the first argument. Method's locals are the
1152 // parameters on top of caller's expression stack.
1153 // Tos points past last Java argument.
1154
1155 __ z_agr(Z_locals, Z_esp);
1156 // z_ijava_state->locals - i*BytesPerWord points to i-th Java local (i starts at 0)
1157 // z_ijava_state->locals = Z_esp + parameter_count bytes
1158 __ z_stg(Z_locals, _z_ijava_state_neg(locals), fp);
1159
1160 // z_ijava_state->oop_temp = NULL;
1161 __ store_const(Address(fp, oop_tmp_offset), 0);
1162
1163 // Initialize z_ijava_state->mdx.
1164 Register Rmdp = Z_bcp;
1165 // native_call: assert that mdo == NULL
1166 const bool check_for_mdo = !native_call DEBUG_ONLY(|| native_call);
1167 if (ProfileInterpreter && check_for_mdo) {
1168 Label get_continue;
1169
1170 __ load_and_test_long(Rmdp, method_(method_data));
1171 __ z_brz(get_continue);
1172 DEBUG_ONLY(if (native_call) __ stop("native methods don't have a mdo"));
1173 __ add2reg(Rmdp, in_bytes(MethodData::data_offset()));
1174 __ bind(get_continue);
1175 }
1176 __ z_stg(Rmdp, _z_ijava_state_neg(mdx), fp);
1177
1178 // Initialize z_ijava_state->bcp and Z_bcp.
1179 if (native_call) {
1180 __ clear_reg(Z_bcp); // Must initialize. Will get written into frame where GC reads it.
1181 } else {
1182 __ add2reg(Z_bcp, in_bytes(ConstMethod::codes_offset()), const_method);
1183 }
1184 __ z_stg(Z_bcp, _z_ijava_state_neg(bcp), fp);
1185
1186 // no monitors and empty operand stack
1187 // => z_ijava_state->monitors points to the top slot in IJAVA_STATE.
1188 // => Z_ijava_state->esp points one slot above into the operand stack.
1189 // z_ijava_state->monitors = fp - frame::z_ijava_state_size - Interpreter::stackElementSize;
1190 // z_ijava_state->esp = Z_esp = z_ijava_state->monitors;
1191 __ add2reg(Z_esp, -frame::z_ijava_state_size, fp);
1192 __ z_stg(Z_esp, _z_ijava_state_neg(monitors), fp);
1193 __ add2reg(Z_esp, -Interpreter::stackElementSize);
1194 __ z_stg(Z_esp, _z_ijava_state_neg(esp), fp);
1195
1196 // z_ijava_state->cpoolCache = Z_R1_scratch (see load above);
1197 __ z_stg(Z_R1_scratch, _z_ijava_state_neg(cpoolCache), fp);
1198
1199 // Get mirror and store it in the frame as GC root for this Method*.
1200 __ load_mirror_from_const_method(Z_R1_scratch, const_method);
1201 __ z_stg(Z_R1_scratch, _z_ijava_state_neg(mirror), fp);
1202
1203 BLOCK_COMMENT("} generate_fixed_frame: initialize interpreter state");
1204
1205 //=============================================================================
1206 if (!native_call) {
1207 // Local_count is already num_locals_slots - num_param_slots.
1208 // Start of locals: local_addr = Z_locals - locals size + 1 slot
1209 __ z_llgh(Z_R0_scratch, Address(const_method, ConstMethod::size_of_locals_offset()));
1210 __ add2reg(local_addr, BytesPerWord, Z_locals);
1211 __ z_sllg(Z_R0_scratch, Z_R0_scratch, LogBytesPerWord);
1212 __ z_sgr(local_addr, Z_R0_scratch);
1213
1214 __ Clear_Array(local_count, local_addr, Z_ARG2);
1215 }
1216
1217 }
1218 // Finally set the frame pointer, destroying Z_method.
1219 assert(Z_fp == Z_method, "maybe set Z_fp earlier if other register than Z_method");
1220 // Oprofile analysis suggests to keep a copy in a register to be used by
1221 // generate_counter_incr().
1222 __ z_lgr(Z_ARG2, Z_method);
1223 __ z_lgr(Z_fp, fp);
1224
1225 BLOCK_COMMENT("} generate_fixed_frame");
1226 }
1227
1228 // Various method entries
1229
1230 // Math function, frame manager must set up an interpreter state, etc.
generate_math_entry(AbstractInterpreter::MethodKind kind)1231 address TemplateInterpreterGenerator::generate_math_entry(AbstractInterpreter::MethodKind kind) {
1232
1233 // Decide what to do: Use same platform specific instructions and runtime calls as compilers.
1234 bool use_instruction = false;
1235 address runtime_entry = NULL;
1236 int num_args = 1;
1237 bool double_precision = true;
1238
1239 // s390 specific:
1240 switch (kind) {
1241 case Interpreter::java_lang_math_sqrt:
1242 case Interpreter::java_lang_math_abs: use_instruction = true; break;
1243 case Interpreter::java_lang_math_fmaF:
1244 case Interpreter::java_lang_math_fmaD: use_instruction = UseFMA; break;
1245 default: break; // Fall back to runtime call.
1246 }
1247
1248 switch (kind) {
1249 case Interpreter::java_lang_math_sin : runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dsin); break;
1250 case Interpreter::java_lang_math_cos : runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dcos); break;
1251 case Interpreter::java_lang_math_tan : runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dtan); break;
1252 case Interpreter::java_lang_math_abs : /* run interpreted */ break;
1253 case Interpreter::java_lang_math_sqrt : /* runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dsqrt); not available */ break;
1254 case Interpreter::java_lang_math_log : runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dlog); break;
1255 case Interpreter::java_lang_math_log10: runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dlog10); break;
1256 case Interpreter::java_lang_math_pow : runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dpow); num_args = 2; break;
1257 case Interpreter::java_lang_math_exp : runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dexp); break;
1258 case Interpreter::java_lang_math_fmaF : /* run interpreted */ num_args = 3; double_precision = false; break;
1259 case Interpreter::java_lang_math_fmaD : /* run interpreted */ num_args = 3; break;
1260 default: ShouldNotReachHere();
1261 }
1262
1263 // Use normal entry if neither instruction nor runtime call is used.
1264 if (!use_instruction && runtime_entry == NULL) return NULL;
1265
1266 address entry = __ pc();
1267
1268 if (use_instruction) {
1269 switch (kind) {
1270 case Interpreter::java_lang_math_sqrt:
1271 // Can use memory operand directly.
1272 __ z_sqdb(Z_FRET, Interpreter::stackElementSize, Z_esp);
1273 break;
1274 case Interpreter::java_lang_math_abs:
1275 // Load operand from stack.
1276 __ mem2freg_opt(Z_FRET, Address(Z_esp, Interpreter::stackElementSize));
1277 __ z_lpdbr(Z_FRET);
1278 break;
1279 case Interpreter::java_lang_math_fmaF:
1280 __ mem2freg_opt(Z_FRET, Address(Z_esp, Interpreter::stackElementSize)); // result reg = arg3
1281 __ mem2freg_opt(Z_FARG2, Address(Z_esp, 3 * Interpreter::stackElementSize)); // arg1
1282 __ z_maeb(Z_FRET, Z_FARG2, Address(Z_esp, 2 * Interpreter::stackElementSize));
1283 break;
1284 case Interpreter::java_lang_math_fmaD:
1285 __ mem2freg_opt(Z_FRET, Address(Z_esp, Interpreter::stackElementSize)); // result reg = arg3
1286 __ mem2freg_opt(Z_FARG2, Address(Z_esp, 5 * Interpreter::stackElementSize)); // arg1
1287 __ z_madb(Z_FRET, Z_FARG2, Address(Z_esp, 3 * Interpreter::stackElementSize));
1288 break;
1289 default: ShouldNotReachHere();
1290 }
1291 } else {
1292 // Load arguments
1293 assert(num_args <= 4, "passed in registers");
1294 if (double_precision) {
1295 int offset = (2 * num_args - 1) * Interpreter::stackElementSize;
1296 for (int i = 0; i < num_args; ++i) {
1297 __ mem2freg_opt(as_FloatRegister(Z_FARG1->encoding() + 2 * i), Address(Z_esp, offset));
1298 offset -= 2 * Interpreter::stackElementSize;
1299 }
1300 } else {
1301 int offset = num_args * Interpreter::stackElementSize;
1302 for (int i = 0; i < num_args; ++i) {
1303 __ mem2freg_opt(as_FloatRegister(Z_FARG1->encoding() + 2 * i), Address(Z_esp, offset));
1304 offset -= Interpreter::stackElementSize;
1305 }
1306 }
1307 // Call runtime
1308 __ save_return_pc(); // Save Z_R14.
1309 __ push_frame_abi160(0); // Without new frame the RT call could overwrite the saved Z_R14.
1310
1311 __ call_VM_leaf(runtime_entry);
1312
1313 __ pop_frame();
1314 __ restore_return_pc(); // Restore Z_R14.
1315 }
1316
1317 // Pop c2i arguments (if any) off when we return.
1318 __ resize_frame_absolute(Z_R10, Z_R0, true); // Cut the stack back to where the caller started.
1319
1320 __ z_br(Z_R14);
1321
1322 return 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.
generate_native_entry(bool synchronized)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 // Load mirror from interpreter frame.
1488 __ z_lg(Z_R1, _z_ijava_state_neg(mirror), Z_fp);
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 __ z_fence();
1556
1557 // Now before we return to java we must look for a current safepoint
1558 // (a new safepoint can not start since we entered native_trans).
1559 // We must check here because a current safepoint could be modifying
1560 // the callers registers right this moment.
1561
1562 // Check for safepoint operation in progress and/or pending suspend requests.
1563 {
1564 Label Continue, do_safepoint;
1565 __ safepoint_poll(do_safepoint, Z_R1);
1566 // Check for suspend.
1567 __ load_and_test_int(Z_R0/*suspend_flags*/, thread_(suspend_flags));
1568 __ z_bre(Continue); // 0 -> no flag set -> not suspended
1569 __ bind(do_safepoint);
1570 __ z_lgr(Z_ARG1, Z_thread);
1571 __ call_c(CAST_FROM_FN_PTR(address, JavaThread::check_special_condition_for_native_trans));
1572 __ bind(Continue);
1573 }
1574
1575 //=============================================================================
1576 // Back in Interpreter Frame.
1577
1578 // We are in thread_in_native_trans here and back in the normal
1579 // interpreter frame. We don't have to do anything special about
1580 // safepoints and we can switch to Java mode anytime we are ready.
1581
1582 // Note: frame::interpreter_frame_result has a dependency on how the
1583 // method result is saved across the call to post_method_exit. For
1584 // native methods it assumes that the non-FPU/non-void result is
1585 // saved in z_ijava_state.lresult and a FPU result in z_ijava_state.fresult. If
1586 // this changes then the interpreter_frame_result implementation
1587 // will need to be updated too.
1588
1589 //=============================================================================
1590 // Back in Java.
1591
1592 // Memory ordering: Z does not reorder store/load with subsequent
1593 // load. That's strong enough.
1594 __ set_thread_state(_thread_in_Java);
1595
1596 __ reset_last_Java_frame();
1597
1598 // We reset the JNI handle block only after unboxing the result; see below.
1599
1600 // The method register is junk from after the thread_in_native transition
1601 // until here. Also can't call_VM until the bcp has been
1602 // restored. Need bcp for throwing exception below so get it now.
1603 __ get_method(Rmethod);
1604
1605 // Restore Z_bcp to have legal interpreter frame,
1606 // i.e., bci == 0 <=> Z_bcp == code_base().
1607 __ z_lg(Z_bcp, Address(Rmethod, Method::const_offset())); // get constMethod
1608 __ add2reg(Z_bcp, in_bytes(ConstMethod::codes_offset())); // get codebase
1609
1610 if (CheckJNICalls) {
1611 // clear_pending_jni_exception_check
1612 __ clear_mem(Address(Z_thread, JavaThread::pending_jni_exception_check_fn_offset()), sizeof(oop));
1613 }
1614
1615 // Check if the native method returns an oop, and if so, move it
1616 // from the jni handle to z_ijava_state.oop_temp. This is
1617 // necessary, because we reset the jni handle block below.
1618 // NOTE: frame::interpreter_frame_result() depends on this, too.
1619 { NearLabel no_oop_result;
1620 __ load_absolute_address(Z_R1, AbstractInterpreter::result_handler(T_OBJECT));
1621 __ compareU64_and_branch(Z_R1, Rresult_handler, Assembler::bcondNotEqual, no_oop_result);
1622 __ resolve_jobject(Rlresult, /* tmp1 */ Rmethod, /* tmp2 */ Z_R1);
1623 __ z_stg(Rlresult, oop_tmp_offset, Z_fp);
1624 __ bind(no_oop_result);
1625 }
1626
1627 // Reset handle block.
1628 __ z_lg(Z_R1/*active_handles*/, thread_(active_handles));
1629 __ clear_mem(Address(Z_R1, JNIHandleBlock::top_offset_in_bytes()), 4);
1630
1631 // Handle exceptions (exception handling will handle unlocking!).
1632 {
1633 Label L;
1634 __ load_and_test_long(Z_R0/*pending_exception*/, thread_(pending_exception));
1635 __ z_bre(L);
1636 __ MacroAssembler::call_VM(noreg,
1637 CAST_FROM_FN_PTR(address,
1638 InterpreterRuntime::throw_pending_exception));
1639 __ should_not_reach_here();
1640 __ bind(L);
1641 }
1642
1643 if (synchronized) {
1644 Register Rfirst_monitor = Z_ARG2;
1645 __ add2reg(Rfirst_monitor, -(frame::z_ijava_state_size + (int)sizeof(BasicObjectLock)), Z_fp);
1646 #ifdef ASSERT
1647 NearLabel ok;
1648 __ z_lg(Z_R1, _z_ijava_state_neg(monitors), Z_fp);
1649 __ compareU64_and_branch(Rfirst_monitor, Z_R1, Assembler::bcondEqual, ok);
1650 reentry = __ stop_chain_static(reentry, "native_entry:unlock: inconsistent z_ijava_state.monitors");
1651 __ bind(ok);
1652 #endif
1653 __ unlock_object(Rfirst_monitor);
1654 }
1655
1656 // JVMTI support. Result has already been saved above to the frame.
1657 __ notify_method_exit(true/*native_method*/, ilgl, InterpreterMacroAssembler::NotifyJVMTI);
1658
1659 // Move native method result back into proper registers and return.
1660 __ mem2freg_opt(Z_FRET, Address(Z_fp, _z_ijava_state_neg(fresult)));
1661 __ mem2reg_opt(Z_RET, Address(Z_fp, _z_ijava_state_neg(lresult)));
1662 __ call_stub(Rresult_handler);
1663
1664 // Pop the native method's interpreter frame.
1665 __ pop_interpreter_frame(Z_R14 /*return_pc*/, Z_ARG2/*tmp1*/, Z_ARG3/*tmp2*/);
1666
1667 // Return to caller.
1668 __ z_br(Z_R14);
1669
1670 if (inc_counter) {
1671 // Handle overflow of counter and compile method.
1672 __ bind(invocation_counter_overflow);
1673 generate_counter_overflow(continue_after_compile);
1674 }
1675
1676 BLOCK_COMMENT("} native_entry");
1677
1678 return entry_point;
1679 }
1680
1681 //
1682 // Generic interpreted method entry to template interpreter.
1683 //
generate_normal_entry(bool synchronized)1684 address TemplateInterpreterGenerator::generate_normal_entry(bool synchronized) {
1685 address entry_point = __ pc();
1686
1687 bool inc_counter = UseCompiler || CountCompiledCalls || LogTouchedMethods;
1688
1689 // Interpreter entry for ordinary Java methods.
1690 //
1691 // Registers alive
1692 // Z_SP - stack pointer
1693 // Z_thread - JavaThread*
1694 // Z_method - callee's method (method to be invoked)
1695 // Z_esp - operand (or expression) stack pointer of caller. one slot above last arg.
1696 // Z_R10 - sender sp (before modifications, e.g. by c2i adapter
1697 // and as well by generate_fixed_frame below)
1698 // Z_R14 - return address to caller (call_stub or c2i_adapter)
1699 //
1700 // Registers updated
1701 // Z_SP - stack pointer
1702 // Z_fp - callee's framepointer
1703 // Z_esp - callee's operand stack pointer
1704 // points to the slot above the value on top
1705 // Z_locals - used to access locals: locals[i] := *(Z_locals - i*BytesPerWord)
1706 // Z_tos - integer result, if any
1707 // z_ftos - floating point result, if any
1708 //
1709 //
1710 // stack layout at this point:
1711 //
1712 // F1 [TOP_IJAVA_FRAME_ABI] <-- Z_SP, Z_R10 (Z_R10 will be below Z_SP if
1713 // frame was extended by c2i adapter)
1714 // [outgoing Java arguments] <-- Z_esp
1715 // ...
1716 // PARENT [PARENT_IJAVA_FRAME_ABI]
1717 // ...
1718 //
1719 // stack layout before dispatching the first bytecode:
1720 //
1721 // F0 [TOP_IJAVA_FRAME_ABI] <-- Z_SP
1722 // [operand stack] <-- Z_esp
1723 // monitor (optional, can grow)
1724 // [IJAVA_STATE]
1725 // F1 [PARENT_IJAVA_FRAME_ABI] <-- Z_fp (== *Z_SP)
1726 // [F0's locals] <-- Z_locals
1727 // [F1's operand stack]
1728 // [F1's monitors] (optional)
1729 // [IJAVA_STATE]
1730
1731 // Make sure registers are different!
1732 assert_different_registers(Z_thread, Z_method, Z_esp);
1733
1734 BLOCK_COMMENT("normal_entry {");
1735
1736 // Make sure method is not native and not abstract.
1737 // Rethink these assertions - they can be simplified and shared.
1738 #ifdef ASSERT
1739 address reentry = NULL;
1740 { Label L;
1741 __ testbit(method_(access_flags), JVM_ACC_NATIVE_BIT);
1742 __ z_bfalse(L);
1743 reentry = __ stop_chain_static(reentry, "tried to execute native method as non-native");
1744 __ bind(L);
1745 }
1746 { Label L;
1747 __ testbit(method_(access_flags), JVM_ACC_ABSTRACT_BIT);
1748 __ z_bfalse(L);
1749 reentry = __ stop_chain_static(reentry, "tried to execute abstract method as non-abstract");
1750 __ bind(L);
1751 }
1752 #endif // ASSERT
1753
1754 #ifdef ASSERT
1755 // Save the return PC into the callers frame for assertion in generate_fixed_frame.
1756 __ save_return_pc(Z_R14);
1757 #endif
1758
1759 // Generate the code to allocate the interpreter stack frame.
1760 generate_fixed_frame(false);
1761
1762 const Address do_not_unlock_if_synchronized(Z_thread, JavaThread::do_not_unlock_if_synchronized_offset());
1763 // Since at this point in the method invocation the exception handler
1764 // would try to exit the monitor of synchronized methods which hasn't
1765 // been entered yet, we set the thread local variable
1766 // _do_not_unlock_if_synchronized to true. If any exception was thrown by
1767 // runtime, exception handling i.e. unlock_if_synchronized_method will
1768 // check this thread local flag.
1769 __ z_mvi(do_not_unlock_if_synchronized, true);
1770
1771 __ profile_parameters_type(Z_tmp_2, Z_ARG3, Z_ARG4);
1772
1773 // Increment invocation counter and check for overflow.
1774 //
1775 // Note: checking for negative value instead of overflow so we have a 'sticky'
1776 // overflow test (may be of importance as soon as we have true MT/MP).
1777 NearLabel invocation_counter_overflow;
1778 NearLabel profile_method;
1779 NearLabel profile_method_continue;
1780 NearLabel Lcontinue;
1781 if (inc_counter) {
1782 generate_counter_incr(&invocation_counter_overflow, &profile_method, &profile_method_continue);
1783 if (ProfileInterpreter) {
1784 __ bind(profile_method_continue);
1785 }
1786 }
1787 __ bind(Lcontinue);
1788
1789 bang_stack_shadow_pages(false);
1790
1791 // Reset the _do_not_unlock_if_synchronized flag.
1792 __ z_mvi(do_not_unlock_if_synchronized, false);
1793
1794 // Check for synchronized methods.
1795 // Must happen AFTER invocation_counter check and stack overflow check,
1796 // so method is not locked if overflows.
1797 if (synchronized) {
1798 // Allocate monitor and lock method.
1799 lock_method();
1800 } else {
1801 #ifdef ASSERT
1802 { Label L;
1803 __ get_method(Z_R1_scratch);
1804 __ testbit(method2_(Z_R1_scratch, access_flags), JVM_ACC_SYNCHRONIZED_BIT);
1805 __ z_bfalse(L);
1806 reentry = __ stop_chain_static(reentry, "method needs synchronization");
1807 __ bind(L);
1808 }
1809 #endif // ASSERT
1810 }
1811
1812 // start execution
1813
1814 #ifdef ASSERT
1815 __ verify_esp(Z_esp, Z_R1_scratch);
1816
1817 __ verify_thread();
1818 #endif
1819
1820 // jvmti support
1821 __ notify_method_entry();
1822
1823 // Start executing instructions.
1824 __ dispatch_next(vtos);
1825 // Dispatch_next does not return.
1826 DEBUG_ONLY(__ should_not_reach_here());
1827
1828 // Invocation counter overflow.
1829 if (inc_counter) {
1830 if (ProfileInterpreter) {
1831 // We have decided to profile this method in the interpreter.
1832 __ bind(profile_method);
1833
1834 __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::profile_method));
1835 __ set_method_data_pointer_for_bcp();
1836 __ z_bru(profile_method_continue);
1837 }
1838
1839 // Handle invocation counter overflow.
1840 __ bind(invocation_counter_overflow);
1841 generate_counter_overflow(Lcontinue);
1842 }
1843
1844 BLOCK_COMMENT("} normal_entry");
1845
1846 return entry_point;
1847 }
1848
1849
1850 /**
1851 * Method entry for static native methods:
1852 * int java.util.zip.CRC32.update(int crc, int b)
1853 */
generate_CRC32_update_entry()1854 address TemplateInterpreterGenerator::generate_CRC32_update_entry() {
1855
1856 if (UseCRC32Intrinsics) {
1857 uint64_t entry_off = __ offset();
1858 Label slow_path;
1859
1860 // If we need a safepoint check, generate full interpreter entry.
1861 __ safepoint_poll(slow_path, Z_R1);
1862
1863 BLOCK_COMMENT("CRC32_update {");
1864
1865 // We don't generate local frame and don't align stack because
1866 // we not even call stub code (we generate the code inline)
1867 // and there is no safepoint on this path.
1868
1869 // Load java parameters.
1870 // Z_esp is callers operand stack pointer, i.e. it points to the parameters.
1871 const Register argP = Z_esp;
1872 const Register crc = Z_ARG1; // crc value
1873 const Register data = Z_ARG2; // address of java byte value (kernel_crc32 needs address)
1874 const Register dataLen = Z_ARG3; // source data len (1 byte). Not used because calling the single-byte emitter.
1875 const Register table = Z_ARG4; // address of crc32 table
1876
1877 // Arguments are reversed on java expression stack.
1878 __ z_la(data, 3+1*wordSize, argP); // byte value (stack address).
1879 // Being passed as an int, the single byte is at offset +3.
1880 __ z_llgf(crc, 2 * wordSize, argP); // Current crc state, zero extend to 64 bit to have a clean register.
1881
1882 StubRoutines::zarch::generate_load_crc_table_addr(_masm, table);
1883 __ kernel_crc32_singleByte(crc, data, dataLen, table, Z_R1, true);
1884
1885 // Restore caller sp for c2i case.
1886 __ resize_frame_absolute(Z_R10, Z_R0, true); // Cut the stack back to where the caller started.
1887
1888 __ z_br(Z_R14);
1889
1890 BLOCK_COMMENT("} CRC32_update");
1891
1892 // Use a previously generated vanilla native entry as the slow path.
1893 BIND(slow_path);
1894 __ jump_to_entry(Interpreter::entry_for_kind(Interpreter::native), Z_R1);
1895 return __ addr_at(entry_off);
1896 }
1897
1898 return NULL;
1899 }
1900
1901
1902 /**
1903 * Method entry for static native methods:
1904 * int java.util.zip.CRC32.updateBytes( int crc, byte[] b, int off, int len)
1905 * int java.util.zip.CRC32.updateByteBuffer(int crc, long* buf, int off, int len)
1906 */
generate_CRC32_updateBytes_entry(AbstractInterpreter::MethodKind kind)1907 address TemplateInterpreterGenerator::generate_CRC32_updateBytes_entry(AbstractInterpreter::MethodKind kind) {
1908
1909 if (UseCRC32Intrinsics) {
1910 uint64_t entry_off = __ offset();
1911 Label slow_path;
1912
1913 // If we need a safepoint check, generate full interpreter entry.
1914 __ safepoint_poll(slow_path, Z_R1);
1915
1916 // We don't generate local frame and don't align stack because
1917 // we call stub code and there is no safepoint on this path.
1918
1919 // Load parameters.
1920 // Z_esp is callers operand stack pointer, i.e. it points to the parameters.
1921 const Register argP = Z_esp;
1922 const Register crc = Z_ARG1; // crc value
1923 const Register data = Z_ARG2; // address of java byte array
1924 const Register dataLen = Z_ARG3; // source data len
1925 const Register table = Z_ARG4; // address of crc32 table
1926 const Register t0 = Z_R10; // work reg for kernel* emitters
1927 const Register t1 = Z_R11; // work reg for kernel* emitters
1928 const Register t2 = Z_R12; // work reg for kernel* emitters
1929 const Register t3 = Z_R13; // work reg for kernel* emitters
1930
1931 // Arguments are reversed on java expression stack.
1932 // Calculate address of start element.
1933 if (kind == Interpreter::java_util_zip_CRC32_updateByteBuffer) { // Used for "updateByteBuffer direct".
1934 // crc @ (SP + 5W) (32bit)
1935 // buf @ (SP + 3W) (64bit ptr to long array)
1936 // off @ (SP + 2W) (32bit)
1937 // dataLen @ (SP + 1W) (32bit)
1938 // data = buf + off
1939 BLOCK_COMMENT("CRC32_updateByteBuffer {");
1940 __ z_llgf(crc, 5*wordSize, argP); // current crc state
1941 __ z_lg(data, 3*wordSize, argP); // start of byte buffer
1942 __ z_agf(data, 2*wordSize, argP); // Add byte buffer offset.
1943 __ z_lgf(dataLen, 1*wordSize, argP); // #bytes to process
1944 } else { // Used for "updateBytes update".
1945 // crc @ (SP + 4W) (32bit)
1946 // buf @ (SP + 3W) (64bit ptr to byte array)
1947 // off @ (SP + 2W) (32bit)
1948 // dataLen @ (SP + 1W) (32bit)
1949 // data = buf + off + base_offset
1950 BLOCK_COMMENT("CRC32_updateBytes {");
1951 __ z_llgf(crc, 4*wordSize, argP); // current crc state
1952 __ z_lg(data, 3*wordSize, argP); // start of byte buffer
1953 __ z_agf(data, 2*wordSize, argP); // Add byte buffer offset.
1954 __ z_lgf(dataLen, 1*wordSize, argP); // #bytes to process
1955 __ z_aghi(data, arrayOopDesc::base_offset_in_bytes(T_BYTE));
1956 }
1957
1958 StubRoutines::zarch::generate_load_crc_table_addr(_masm, table);
1959
1960 __ resize_frame(-(6*8), Z_R0, true); // Resize frame to provide add'l space to spill 5 registers.
1961 __ z_stmg(t0, t3, 1*8, Z_SP); // Spill regs 10..13 to make them available as work registers.
1962 __ kernel_crc32_1word(crc, data, dataLen, table, t0, t1, t2, t3, true);
1963 __ z_lmg(t0, t3, 1*8, Z_SP); // Spill regs 10..13 back from stack.
1964
1965 // Restore caller sp for c2i case.
1966 __ resize_frame_absolute(Z_R10, Z_R0, true); // Cut the stack back to where the caller started.
1967
1968 __ z_br(Z_R14);
1969
1970 BLOCK_COMMENT("} CRC32_update{Bytes|ByteBuffer}");
1971
1972 // Use a previously generated vanilla native entry as the slow path.
1973 BIND(slow_path);
1974 __ jump_to_entry(Interpreter::entry_for_kind(Interpreter::native), Z_R1);
1975 return __ addr_at(entry_off);
1976 }
1977
1978 return NULL;
1979 }
1980
1981
1982 /**
1983 * Method entry for intrinsic-candidate (non-native) methods:
1984 * int java.util.zip.CRC32C.updateBytes( int crc, byte[] b, int off, int end)
1985 * int java.util.zip.CRC32C.updateDirectByteBuffer(int crc, long* buf, int off, int end)
1986 * Unlike CRC32, CRC32C does not have any methods marked as native
1987 * CRC32C also uses an "end" variable instead of the length variable CRC32 uses
1988 */
generate_CRC32C_updateBytes_entry(AbstractInterpreter::MethodKind kind)1989 address TemplateInterpreterGenerator::generate_CRC32C_updateBytes_entry(AbstractInterpreter::MethodKind kind) {
1990
1991 if (UseCRC32CIntrinsics) {
1992 uint64_t entry_off = __ offset();
1993
1994 // We don't generate local frame and don't align stack because
1995 // we call stub code and there is no safepoint on this path.
1996
1997 // Load parameters.
1998 // Z_esp is callers operand stack pointer, i.e. it points to the parameters.
1999 const Register argP = Z_esp;
2000 const Register crc = Z_ARG1; // crc value
2001 const Register data = Z_ARG2; // address of java byte array
2002 const Register dataLen = Z_ARG3; // source data len
2003 const Register table = Z_ARG4; // address of crc32 table
2004 const Register t0 = Z_R10; // work reg for kernel* emitters
2005 const Register t1 = Z_R11; // work reg for kernel* emitters
2006 const Register t2 = Z_R12; // work reg for kernel* emitters
2007 const Register t3 = Z_R13; // work reg for kernel* emitters
2008
2009 // Arguments are reversed on java expression stack.
2010 // Calculate address of start element.
2011 if (kind == Interpreter::java_util_zip_CRC32C_updateDirectByteBuffer) { // Used for "updateByteBuffer direct".
2012 // crc @ (SP + 5W) (32bit)
2013 // buf @ (SP + 3W) (64bit ptr to long array)
2014 // off @ (SP + 2W) (32bit)
2015 // dataLen @ (SP + 1W) (32bit)
2016 // data = buf + off
2017 BLOCK_COMMENT("CRC32C_updateDirectByteBuffer {");
2018 __ z_llgf(crc, 5*wordSize, argP); // current crc state
2019 __ z_lg(data, 3*wordSize, argP); // start of byte buffer
2020 __ z_agf(data, 2*wordSize, argP); // Add byte buffer offset.
2021 __ z_lgf(dataLen, 1*wordSize, argP); // #bytes to process, calculated as
2022 __ z_sgf(dataLen, Address(argP, 2*wordSize)); // (end_index - offset)
2023 } else { // Used for "updateBytes update".
2024 // crc @ (SP + 4W) (32bit)
2025 // buf @ (SP + 3W) (64bit ptr to byte array)
2026 // off @ (SP + 2W) (32bit)
2027 // dataLen @ (SP + 1W) (32bit)
2028 // data = buf + off + base_offset
2029 BLOCK_COMMENT("CRC32C_updateBytes {");
2030 __ z_llgf(crc, 4*wordSize, argP); // current crc state
2031 __ z_lg(data, 3*wordSize, argP); // start of byte buffer
2032 __ z_agf(data, 2*wordSize, argP); // Add byte buffer offset.
2033 __ z_lgf(dataLen, 1*wordSize, argP); // #bytes to process, calculated as
2034 __ z_sgf(dataLen, Address(argP, 2*wordSize)); // (end_index - offset)
2035 __ z_aghi(data, arrayOopDesc::base_offset_in_bytes(T_BYTE));
2036 }
2037
2038 StubRoutines::zarch::generate_load_crc32c_table_addr(_masm, table);
2039
2040 __ resize_frame(-(6*8), Z_R0, true); // Resize frame to provide add'l space to spill 5 registers.
2041 __ z_stmg(t0, t3, 1*8, Z_SP); // Spill regs 10..13 to make them available as work registers.
2042 __ kernel_crc32_1word(crc, data, dataLen, table, t0, t1, t2, t3, false);
2043 __ z_lmg(t0, t3, 1*8, Z_SP); // Spill regs 10..13 back from stack.
2044
2045 // Restore caller sp for c2i case.
2046 __ resize_frame_absolute(Z_R10, Z_R0, true); // Cut the stack back to where the caller started.
2047
2048 __ z_br(Z_R14);
2049
2050 BLOCK_COMMENT("} CRC32C_update{Bytes|DirectByteBuffer}");
2051 return __ addr_at(entry_off);
2052 }
2053
2054 return NULL;
2055 }
2056
bang_stack_shadow_pages(bool native_call)2057 void TemplateInterpreterGenerator::bang_stack_shadow_pages(bool native_call) {
2058 // Quick & dirty stack overflow checking: bang the stack & handle trap.
2059 // Note that we do the banging after the frame is setup, since the exception
2060 // handling code expects to find a valid interpreter frame on the stack.
2061 // Doing the banging earlier fails if the caller frame is not an interpreter
2062 // frame.
2063 // (Also, the exception throwing code expects to unlock any synchronized
2064 // method receiver, so do the banging after locking the receiver.)
2065
2066 // Bang each page in the shadow zone. We can't assume it's been done for
2067 // an interpreter frame with greater than a page of locals, so each page
2068 // needs to be checked. Only true for non-native. For native, we only bang the last page.
2069 if (UseStackBanging) {
2070 const int page_size = os::vm_page_size();
2071 const int n_shadow_pages = (int)(StackOverflow::stack_shadow_zone_size()/page_size);
2072 const int start_page_num = native_call ? n_shadow_pages : 1;
2073 for (int pages = start_page_num; pages <= n_shadow_pages; pages++) {
2074 __ bang_stack_with_offset(pages*page_size);
2075 }
2076 }
2077 }
2078
2079 //-----------------------------------------------------------------------------
2080 // Exceptions
2081
generate_throw_exception()2082 void TemplateInterpreterGenerator::generate_throw_exception() {
2083
2084 BLOCK_COMMENT("throw_exception {");
2085
2086 // Entry point in previous activation (i.e., if the caller was interpreted).
2087 Interpreter::_rethrow_exception_entry = __ pc();
2088 __ z_lg(Z_fp, _z_abi(callers_sp), Z_SP); // Frame accessors use Z_fp.
2089 // Z_ARG1 (==Z_tos): exception
2090 // Z_ARG2 : Return address/pc that threw exception.
2091 __ restore_bcp(); // R13 points to call/send.
2092 __ restore_locals();
2093
2094 // Fallthrough, no need to restore Z_esp.
2095
2096 // Entry point for exceptions thrown within interpreter code.
2097 Interpreter::_throw_exception_entry = __ pc();
2098 // Expression stack is undefined here.
2099 // Z_ARG1 (==Z_tos): exception
2100 // Z_bcp: exception bcp
2101 __ verify_oop(Z_ARG1);
2102 __ z_lgr(Z_ARG2, Z_ARG1);
2103
2104 // Expression stack must be empty before entering the VM in case of
2105 // an exception.
2106 __ empty_expression_stack();
2107 // Find exception handler address and preserve exception oop.
2108 const Register Rpreserved_exc_oop = Z_tmp_1;
2109 __ call_VM(Rpreserved_exc_oop,
2110 CAST_FROM_FN_PTR(address, InterpreterRuntime::exception_handler_for_exception),
2111 Z_ARG2);
2112 // Z_RET: exception handler entry point
2113 // Z_bcp: bcp for exception handler
2114 __ push_ptr(Rpreserved_exc_oop); // Push exception which is now the only value on the stack.
2115 __ z_br(Z_RET); // Jump to exception handler (may be _remove_activation_entry!).
2116
2117 // If the exception is not handled in the current frame the frame is
2118 // removed and the exception is rethrown (i.e. exception
2119 // continuation is _rethrow_exception).
2120 //
2121 // Note: At this point the bci is still the bci for the instruction
2122 // which caused the exception and the expression stack is
2123 // empty. Thus, for any VM calls at this point, GC will find a legal
2124 // oop map (with empty expression stack).
2125
2126 //
2127 // JVMTI PopFrame support
2128 //
2129
2130 Interpreter::_remove_activation_preserving_args_entry = __ pc();
2131 __ z_lg(Z_fp, _z_parent_ijava_frame_abi(callers_sp), Z_SP);
2132 __ empty_expression_stack();
2133 // Set the popframe_processing bit in pending_popframe_condition
2134 // indicating that we are currently handling popframe, so that
2135 // call_VMs that may happen later do not trigger new popframe
2136 // handling cycles.
2137 __ load_sized_value(Z_tmp_1, Address(Z_thread, JavaThread::popframe_condition_offset()), 4, false /*signed*/);
2138 __ z_oill(Z_tmp_1, JavaThread::popframe_processing_bit);
2139 __ z_sty(Z_tmp_1, thread_(popframe_condition));
2140
2141 {
2142 // Check to see whether we are returning to a deoptimized frame.
2143 // (The PopFrame call ensures that the caller of the popped frame is
2144 // either interpreted or compiled and deoptimizes it if compiled.)
2145 // In this case, we can't call dispatch_next() after the frame is
2146 // popped, but instead must save the incoming arguments and restore
2147 // them after deoptimization has occurred.
2148 //
2149 // Note that we don't compare the return PC against the
2150 // deoptimization blob's unpack entry because of the presence of
2151 // adapter frames in C2.
2152 NearLabel caller_not_deoptimized;
2153 __ z_lg(Z_ARG1, _z_parent_ijava_frame_abi(return_pc), Z_fp);
2154 __ call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::interpreter_contains), Z_ARG1);
2155 __ compareU64_and_branch(Z_RET, (intptr_t)0, Assembler::bcondNotEqual, caller_not_deoptimized);
2156
2157 // Compute size of arguments for saving when returning to
2158 // deoptimized caller.
2159 __ get_method(Z_ARG2);
2160 __ z_lg(Z_ARG2, Address(Z_ARG2, Method::const_offset()));
2161 __ z_llgh(Z_ARG2, Address(Z_ARG2, ConstMethod::size_of_parameters_offset()));
2162 __ z_sllg(Z_ARG2, Z_ARG2, Interpreter::logStackElementSize); // slots 2 bytes
2163 __ restore_locals();
2164 // Compute address of args to be saved.
2165 __ z_lgr(Z_ARG3, Z_locals);
2166 __ z_slgr(Z_ARG3, Z_ARG2);
2167 __ add2reg(Z_ARG3, wordSize);
2168 // Save these arguments.
2169 __ call_VM_leaf(CAST_FROM_FN_PTR(address, Deoptimization::popframe_preserve_args),
2170 Z_thread, Z_ARG2, Z_ARG3);
2171
2172 __ remove_activation(vtos, Z_R14,
2173 /* throw_monitor_exception */ false,
2174 /* install_monitor_exception */ false,
2175 /* notify_jvmdi */ false);
2176
2177 // Inform deoptimization that it is responsible for restoring
2178 // these arguments.
2179 __ store_const(thread_(popframe_condition),
2180 JavaThread::popframe_force_deopt_reexecution_bit,
2181 Z_tmp_1, false);
2182
2183 // Continue in deoptimization handler.
2184 __ z_br(Z_R14);
2185
2186 __ bind(caller_not_deoptimized);
2187 }
2188
2189 // Clear the popframe condition flag.
2190 __ clear_mem(thread_(popframe_condition), sizeof(int));
2191
2192 __ remove_activation(vtos,
2193 noreg, // Retaddr is not used.
2194 false, // throw_monitor_exception
2195 false, // install_monitor_exception
2196 false); // notify_jvmdi
2197 __ z_lg(Z_fp, _z_abi(callers_sp), Z_SP); // Restore frame pointer.
2198 __ restore_bcp();
2199 __ restore_locals();
2200 __ restore_esp();
2201 // The method data pointer was incremented already during
2202 // call profiling. We have to restore the mdp for the current bcp.
2203 if (ProfileInterpreter) {
2204 __ set_method_data_pointer_for_bcp();
2205 }
2206 #if INCLUDE_JVMTI
2207 {
2208 Label L_done;
2209
2210 __ z_cli(0, Z_bcp, Bytecodes::_invokestatic);
2211 __ z_brc(Assembler::bcondNotEqual, L_done);
2212
2213 // The member name argument must be restored if _invokestatic is
2214 // re-executed after a PopFrame call. Detect such a case in the
2215 // InterpreterRuntime function and return the member name
2216 // argument, or NULL.
2217 __ z_lg(Z_ARG2, Address(Z_locals));
2218 __ get_method(Z_ARG3);
2219 __ call_VM(Z_tmp_1,
2220 CAST_FROM_FN_PTR(address, InterpreterRuntime::member_name_arg_or_null),
2221 Z_ARG2, Z_ARG3, Z_bcp);
2222
2223 __ z_ltgr(Z_tmp_1, Z_tmp_1);
2224 __ z_brc(Assembler::bcondEqual, L_done);
2225
2226 __ z_stg(Z_tmp_1, Address(Z_esp, wordSize));
2227 __ bind(L_done);
2228 }
2229 #endif // INCLUDE_JVMTI
2230 __ dispatch_next(vtos);
2231 // End of PopFrame support.
2232 Interpreter::_remove_activation_entry = __ pc();
2233
2234 // In between activations - previous activation type unknown yet
2235 // compute continuation point - the continuation point expects the
2236 // following registers set up:
2237 //
2238 // Z_ARG1 (==Z_tos): exception
2239 // Z_ARG2 : return address/pc that threw exception
2240
2241 Register return_pc = Z_tmp_1;
2242 Register handler = Z_tmp_2;
2243 assert(return_pc->is_nonvolatile(), "use non-volatile reg. to preserve exception pc");
2244 assert(handler->is_nonvolatile(), "use non-volatile reg. to handler pc");
2245 __ asm_assert_ijava_state_magic(return_pc/*tmp*/); // The top frame should be an interpreter frame.
2246 __ z_lg(return_pc, _z_parent_ijava_frame_abi(return_pc), Z_fp);
2247
2248 // Moved removing the activation after VM call, because the new top
2249 // frame does not necessarily have the z_abi_160 required for a VM
2250 // call (e.g. if it is compiled).
2251
2252 __ super_call_VM_leaf(CAST_FROM_FN_PTR(address,
2253 SharedRuntime::exception_handler_for_return_address),
2254 Z_thread, return_pc);
2255 __ z_lgr(handler, Z_RET); // Save exception handler.
2256
2257 // Preserve exception over this code sequence.
2258 __ pop_ptr(Z_ARG1);
2259 __ set_vm_result(Z_ARG1);
2260 // Remove the activation (without doing throws on illegalMonitorExceptions).
2261 __ remove_activation(vtos, noreg/*ret.pc already loaded*/, false/*throw exc*/, true/*install exc*/, false/*notify jvmti*/);
2262 __ z_lg(Z_fp, _z_abi(callers_sp), Z_SP); // Restore frame pointer.
2263
2264 __ get_vm_result(Z_ARG1); // Restore exception.
2265 __ verify_oop(Z_ARG1);
2266 __ z_lgr(Z_ARG2, return_pc); // Restore return address.
2267
2268 #ifdef ASSERT
2269 // The return_pc in the new top frame is dead... at least that's my
2270 // current understanding. To assert this I overwrite it.
2271 // Note: for compiled frames the handler is the deopt blob
2272 // which writes Z_ARG2 into the return_pc slot.
2273 __ load_const_optimized(return_pc, 0xb00b1);
2274 __ z_stg(return_pc, _z_parent_ijava_frame_abi(return_pc), Z_SP);
2275 #endif
2276
2277 // Z_ARG1 (==Z_tos): exception
2278 // Z_ARG2 : return address/pc that threw exception
2279
2280 // Note that an "issuing PC" is actually the next PC after the call.
2281 __ z_br(handler); // Jump to exception handler of caller.
2282
2283 BLOCK_COMMENT("} throw_exception");
2284 }
2285
2286 //
2287 // JVMTI ForceEarlyReturn support
2288 //
generate_earlyret_entry_for(TosState state)2289 address TemplateInterpreterGenerator::generate_earlyret_entry_for (TosState state) {
2290 address entry = __ pc();
2291
2292 BLOCK_COMMENT("earlyret_entry {");
2293
2294 __ z_lg(Z_fp, _z_parent_ijava_frame_abi(callers_sp), Z_SP);
2295 __ restore_bcp();
2296 __ restore_locals();
2297 __ restore_esp();
2298 __ empty_expression_stack();
2299 __ load_earlyret_value(state);
2300
2301 Register RjvmtiState = Z_tmp_1;
2302 __ z_lg(RjvmtiState, thread_(jvmti_thread_state));
2303 __ store_const(Address(RjvmtiState, JvmtiThreadState::earlyret_state_offset()),
2304 JvmtiThreadState::earlyret_inactive, 4, 4, Z_R0_scratch);
2305
2306 if (state == itos) {
2307 // Narrow result if state is itos but result type is smaller.
2308 // Need to narrow in the return bytecode rather than in generate_return_entry
2309 // since compiled code callers expect the result to already be narrowed.
2310 __ narrow(Z_tos, Z_tmp_1); /* fall through */
2311 }
2312 __ remove_activation(state,
2313 Z_tmp_1, // retaddr
2314 false, // throw_monitor_exception
2315 false, // install_monitor_exception
2316 true); // notify_jvmdi
2317 __ z_br(Z_tmp_1);
2318
2319 BLOCK_COMMENT("} earlyret_entry");
2320
2321 return entry;
2322 }
2323
2324 //-----------------------------------------------------------------------------
2325 // Helper for vtos entry point generation.
2326
set_vtos_entry_points(Template * t,address & bep,address & cep,address & sep,address & aep,address & iep,address & lep,address & fep,address & dep,address & vep)2327 void TemplateInterpreterGenerator::set_vtos_entry_points(Template* t,
2328 address& bep,
2329 address& cep,
2330 address& sep,
2331 address& aep,
2332 address& iep,
2333 address& lep,
2334 address& fep,
2335 address& dep,
2336 address& vep) {
2337 assert(t->is_valid() && t->tos_in() == vtos, "illegal template");
2338 Label L;
2339 aep = __ pc(); __ push_ptr(); __ z_bru(L);
2340 fep = __ pc(); __ push_f(); __ z_bru(L);
2341 dep = __ pc(); __ push_d(); __ z_bru(L);
2342 lep = __ pc(); __ push_l(); __ z_bru(L);
2343 bep = cep = sep =
2344 iep = __ pc(); __ push_i();
2345 vep = __ pc();
2346 __ bind(L);
2347 generate_and_dispatch(t);
2348 }
2349
2350 //-----------------------------------------------------------------------------
2351
2352 #ifndef PRODUCT
generate_trace_code(TosState state)2353 address TemplateInterpreterGenerator::generate_trace_code(TosState state) {
2354 address entry = __ pc();
2355 NearLabel counter_below_trace_threshold;
2356
2357 if (TraceBytecodesAt > 0) {
2358 // Skip runtime call, if the trace threshold is not yet reached.
2359 __ load_absolute_address(Z_tmp_1, (address)&BytecodeCounter::_counter_value);
2360 __ load_absolute_address(Z_tmp_2, (address)&TraceBytecodesAt);
2361 __ load_sized_value(Z_tmp_1, Address(Z_tmp_1), 4, false /*signed*/);
2362 __ load_sized_value(Z_tmp_2, Address(Z_tmp_2), 8, false /*signed*/);
2363 __ compareU64_and_branch(Z_tmp_1, Z_tmp_2, Assembler::bcondLow, counter_below_trace_threshold);
2364 }
2365
2366 int offset2 = state == ltos || state == dtos ? 2 : 1;
2367
2368 __ push(state);
2369 // Preserved return pointer is in Z_R14.
2370 // InterpreterRuntime::trace_bytecode() preserved and returns the value passed as second argument.
2371 __ z_lgr(Z_ARG2, Z_R14);
2372 __ z_lg(Z_ARG3, Address(Z_esp, Interpreter::expr_offset_in_bytes(0)));
2373 if (WizardMode) {
2374 __ z_lgr(Z_ARG4, Z_esp); // Trace Z_esp in WizardMode.
2375 } else {
2376 __ z_lg(Z_ARG4, Address(Z_esp, Interpreter::expr_offset_in_bytes(offset2)));
2377 }
2378 __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::trace_bytecode), Z_ARG2, Z_ARG3, Z_ARG4);
2379 __ z_lgr(Z_R14, Z_RET); // Estore return address (see above).
2380 __ pop(state);
2381
2382 __ bind(counter_below_trace_threshold);
2383 __ z_br(Z_R14); // return
2384
2385 return entry;
2386 }
2387
2388 // Make feasible for old CPUs.
count_bytecode()2389 void TemplateInterpreterGenerator::count_bytecode() {
2390 __ load_absolute_address(Z_R1_scratch, (address) &BytecodeCounter::_counter_value);
2391 __ add2mem_32(Address(Z_R1_scratch), 1, Z_R0_scratch);
2392 }
2393
histogram_bytecode(Template * t)2394 void TemplateInterpreterGenerator::histogram_bytecode(Template * t) {
2395 __ load_absolute_address(Z_R1_scratch, (address)&BytecodeHistogram::_counters[ t->bytecode() ]);
2396 __ add2mem_32(Address(Z_R1_scratch), 1, Z_tmp_1);
2397 }
2398
histogram_bytecode_pair(Template * t)2399 void TemplateInterpreterGenerator::histogram_bytecode_pair(Template * t) {
2400 Address index_addr(Z_tmp_1, (intptr_t) 0);
2401 Register index = Z_tmp_2;
2402
2403 // Load previous index.
2404 __ load_absolute_address(Z_tmp_1, (address) &BytecodePairHistogram::_index);
2405 __ mem2reg_opt(index, index_addr, false);
2406
2407 // Mask with current bytecode and store as new previous index.
2408 __ z_srl(index, BytecodePairHistogram::log2_number_of_codes);
2409 __ load_const_optimized(Z_R0_scratch,
2410 (int)t->bytecode() << BytecodePairHistogram::log2_number_of_codes);
2411 __ z_or(index, Z_R0_scratch);
2412 __ reg2mem_opt(index, index_addr, false);
2413
2414 // Load counter array's address.
2415 __ z_lgfr(index, index); // Sign extend for addressing.
2416 __ z_sllg(index, index, LogBytesPerInt); // index2bytes
2417 __ load_absolute_address(Z_R1_scratch,
2418 (address) &BytecodePairHistogram::_counters);
2419 // Add index and increment counter.
2420 __ z_agr(Z_R1_scratch, index);
2421 __ add2mem_32(Address(Z_R1_scratch), 1, Z_tmp_1);
2422 }
2423
trace_bytecode(Template * t)2424 void TemplateInterpreterGenerator::trace_bytecode(Template* t) {
2425 // Call a little run-time stub to avoid blow-up for each bytecode.
2426 // The run-time runtime saves the right registers, depending on
2427 // the tosca in-state for the given template.
2428 address entry = Interpreter::trace_code(t->tos_in());
2429 guarantee(entry != NULL, "entry must have been generated");
2430 __ call_stub(entry);
2431 }
2432
stop_interpreter_at()2433 void TemplateInterpreterGenerator::stop_interpreter_at() {
2434 NearLabel L;
2435
2436 __ load_absolute_address(Z_tmp_1, (address)&BytecodeCounter::_counter_value);
2437 __ load_absolute_address(Z_tmp_2, (address)&StopInterpreterAt);
2438 __ load_sized_value(Z_tmp_1, Address(Z_tmp_1), 4, false /*signed*/);
2439 __ load_sized_value(Z_tmp_2, Address(Z_tmp_2), 8, false /*signed*/);
2440 __ compareU64_and_branch(Z_tmp_1, Z_tmp_2, Assembler::bcondLow, L);
2441 assert(Z_tmp_1->is_nonvolatile(), "must be nonvolatile to preserve Z_tos");
2442 assert(Z_F8->is_nonvolatile(), "must be nonvolatile to preserve Z_ftos");
2443 __ z_lgr(Z_tmp_1, Z_tos); // Save tos.
2444 __ z_lgr(Z_tmp_2, Z_bytecode); // Save Z_bytecode.
2445 __ z_ldr(Z_F8, Z_ftos); // Save ftos.
2446 // Use -XX:StopInterpreterAt=<num> to set the limit
2447 // and break at breakpoint().
2448 __ call_VM(noreg, CAST_FROM_FN_PTR(address, breakpoint), false);
2449 __ z_lgr(Z_tos, Z_tmp_1); // Restore tos.
2450 __ z_lgr(Z_bytecode, Z_tmp_2); // Save Z_bytecode.
2451 __ z_ldr(Z_ftos, Z_F8); // Restore ftos.
2452 __ bind(L);
2453 }
2454
2455 #endif // !PRODUCT
2456