1 /*
2 * Copyright (c) 2016, 2020, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2016, 2019, 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 "gc/shared/barrierSetAssembler.hpp"
29 #include "interpreter/abstractInterpreter.hpp"
30 #include "interpreter/bytecodeHistogram.hpp"
31 #include "interpreter/interpreter.hpp"
32 #include "interpreter/interpreterRuntime.hpp"
33 #include "interpreter/interp_masm.hpp"
34 #include "interpreter/templateInterpreterGenerator.hpp"
35 #include "interpreter/templateTable.hpp"
36 #include "oops/arrayOop.hpp"
37 #include "oops/oop.inline.hpp"
38 #include "prims/jvmtiExport.hpp"
39 #include "prims/jvmtiThreadState.hpp"
40 #include "runtime/arguments.hpp"
41 #include "runtime/deoptimization.hpp"
42 #include "runtime/frame.inline.hpp"
43 #include "runtime/sharedRuntime.hpp"
44 #include "runtime/stubRoutines.hpp"
45 #include "runtime/synchronizer.hpp"
46 #include "runtime/timer.hpp"
47 #include "runtime/vframeArray.hpp"
48 #include "utilities/debug.hpp"
49
50
51 // Size of interpreter code. Increase if too small. Interpreter will
52 // fail with a guarantee ("not enough space for interpreter generation");
53 // if too small.
54 // Run with +PrintInterpreter to get the VM to print out the size.
55 // Max size with JVMTI
56 int TemplateInterpreter::InterpreterCodeSize = 320*K;
57
58 #undef __
59 #ifdef PRODUCT
60 #define __ _masm->
61 #else
62 #define __ _masm->
63 // #define __ (Verbose ? (_masm->block_comment(FILE_AND_LINE),_masm):_masm)->
64 #endif
65
66 #define BLOCK_COMMENT(str) __ block_comment(str)
67 #define BIND(label) __ bind(label); BLOCK_COMMENT(#label ":")
68
69 #define oop_tmp_offset _z_ijava_state_neg(oop_tmp)
70
71 //-----------------------------------------------------------------------------
72
generate_slow_signature_handler()73 address TemplateInterpreterGenerator::generate_slow_signature_handler() {
74 //
75 // New slow_signature handler that respects the z/Architecture
76 // C calling conventions.
77 //
78 // We get called by the native entry code with our output register
79 // area == 8. First we call InterpreterRuntime::get_result_handler
80 // to copy the pointer to the signature string temporarily to the
81 // first C-argument and to return the result_handler in
82 // Z_RET. Since native_entry will copy the jni-pointer to the
83 // first C-argument slot later on, it's OK to occupy this slot
84 // temporarily. Then we copy the argument list on the java
85 // expression stack into native varargs format on the native stack
86 // and load arguments into argument registers. Integer arguments in
87 // the varargs vector will be sign-extended to 8 bytes.
88 //
89 // On entry:
90 // Z_ARG1 - intptr_t* Address of java argument list in memory.
91 // Z_state - cppInterpreter* Address of interpreter state for
92 // this method
93 // Z_method
94 //
95 // On exit (just before return instruction):
96 // Z_RET contains the address of the result_handler.
97 // Z_ARG2 is not updated for static methods and contains "this" otherwise.
98 // Z_ARG3-Z_ARG5 contain the first 3 arguments of types other than float and double.
99 // Z_FARG1-Z_FARG4 contain the first 4 arguments of type float or double.
100
101 const int LogSizeOfCase = 3;
102
103 const int max_fp_register_arguments = Argument::n_float_register_parameters;
104 const int max_int_register_arguments = Argument::n_register_parameters - 2; // First 2 are reserved.
105
106 const Register arg_java = Z_tmp_2;
107 const Register arg_c = Z_tmp_3;
108 const Register signature = Z_R1_scratch; // Is a string.
109 const Register fpcnt = Z_R0_scratch;
110 const Register argcnt = Z_tmp_4;
111 const Register intSlot = Z_tmp_1;
112 const Register sig_end = Z_tmp_1; // Assumed end of signature (only used in do_object).
113 const Register target_sp = Z_tmp_1;
114 const FloatRegister floatSlot = Z_F1;
115
116 const int d_signature = _z_abi(gpr6); // Only spill space, register contents not affected.
117 const int d_fpcnt = _z_abi(gpr7); // Only spill space, register contents not affected.
118
119 unsigned int entry_offset = __ offset();
120
121 BLOCK_COMMENT("slow_signature_handler {");
122
123 // We use target_sp for storing arguments in the C frame.
124 __ save_return_pc();
125 __ push_frame_abi160(4*BytesPerWord); // Reserve space to save the tmp_[1..4] registers.
126 __ z_stmg(Z_R10, Z_R13, frame::z_abi_160_size, Z_SP); // Save registers only after frame is pushed.
127
128 __ z_lgr(arg_java, Z_ARG1);
129
130 Register method = Z_ARG2; // Directly load into correct argument register.
131
132 __ get_method(method);
133 __ call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::get_signature), Z_thread, method);
134
135 // Move signature to callee saved register.
136 // Don't directly write to stack. Frame is used by VM call.
137 __ z_lgr(Z_tmp_1, Z_RET);
138
139 // Reload method. Register may have been altered by VM call.
140 __ get_method(method);
141
142 // Get address of result handler.
143 __ call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::get_result_handler), Z_thread, method);
144
145 // Save signature address to stack.
146 __ z_stg(Z_tmp_1, d_signature, Z_SP);
147
148 // Don't overwrite return value (Z_RET, Z_ARG1) in rest of the method !
149
150 {
151 Label isStatic;
152
153 // Test if static.
154 // We can test the bit directly.
155 // Path is Z_method->_access_flags._flags.
156 // We only support flag bits in the least significant byte (assert !).
157 // Therefore add 3 to address that byte within "_flags".
158 // Reload method. VM call above may have destroyed register contents
159 __ get_method(method);
160 __ testbit(method2_(method, access_flags), JVM_ACC_STATIC_BIT);
161 method = noreg; // end of life
162 __ z_btrue(isStatic);
163
164 // For non-static functions, pass "this" in Z_ARG2 and copy it to 2nd C-arg slot.
165 // Need to box the Java object here, so we use arg_java
166 // (address of current Java stack slot) as argument and
167 // don't dereference it as in case of ints, floats, etc..
168 __ z_lgr(Z_ARG2, arg_java);
169 __ add2reg(arg_java, -BytesPerWord);
170 __ bind(isStatic);
171 }
172
173 // argcnt == 0 corresponds to 3rd C argument.
174 // arg #1 (result handler) and
175 // arg #2 (this, for non-statics), unused else
176 // are reserved and pre-filled above.
177 // arg_java points to the corresponding Java argument here. It
178 // has been decremented by one argument (this) in case of non-static.
179 __ clear_reg(argcnt, true, false); // Don't set CC.
180 __ z_lg(target_sp, 0, Z_SP);
181 __ add2reg(arg_c, _z_abi(remaining_cargs), target_sp);
182 // No floating-point args parsed so far.
183 __ clear_mem(Address(Z_SP, d_fpcnt), 8);
184
185 NearLabel move_intSlot_to_ARG, move_floatSlot_to_FARG;
186 NearLabel loop_start, loop_start_restore, loop_end;
187 NearLabel do_int, do_long, do_float, do_double;
188 NearLabel do_dontreachhere, do_object, do_array, do_boxed;
189
190 #ifdef ASSERT
191 // Signature needs to point to '(' (== 0x28) at entry.
192 __ z_lg(signature, d_signature, Z_SP);
193 __ z_cli(0, signature, (int) '(');
194 __ z_brne(do_dontreachhere);
195 #endif
196
197 __ bind(loop_start_restore);
198 __ z_lg(signature, d_signature, Z_SP); // Restore signature ptr, destroyed by move_XX_to_ARG.
199
200 BIND(loop_start);
201 // Advance to next argument type token from the signature.
202 __ add2reg(signature, 1);
203
204 // Use CLI, works well on all CPU versions.
205 __ z_cli(0, signature, (int) ')');
206 __ z_bre(loop_end); // end of signature
207 __ z_cli(0, signature, (int) 'L');
208 __ z_bre(do_object); // object #9
209 __ z_cli(0, signature, (int) 'F');
210 __ z_bre(do_float); // float #7
211 __ z_cli(0, signature, (int) 'J');
212 __ z_bre(do_long); // long #6
213 __ z_cli(0, signature, (int) 'B');
214 __ z_bre(do_int); // byte #1
215 __ z_cli(0, signature, (int) 'Z');
216 __ z_bre(do_int); // boolean #2
217 __ z_cli(0, signature, (int) 'C');
218 __ z_bre(do_int); // char #3
219 __ z_cli(0, signature, (int) 'S');
220 __ z_bre(do_int); // short #4
221 __ z_cli(0, signature, (int) 'I');
222 __ z_bre(do_int); // int #5
223 __ z_cli(0, signature, (int) 'D');
224 __ z_bre(do_double); // double #8
225 __ z_cli(0, signature, (int) '[');
226 __ z_bre(do_array); // array #10
227
228 __ bind(do_dontreachhere);
229
230 __ unimplemented("ShouldNotReachHere in slow_signature_handler", 120);
231
232 // Array argument
233 BIND(do_array);
234
235 {
236 Label start_skip, end_skip;
237
238 __ bind(start_skip);
239
240 // Advance to next type tag from signature.
241 __ add2reg(signature, 1);
242
243 // Use CLI, works well on all CPU versions.
244 __ z_cli(0, signature, (int) '[');
245 __ z_bre(start_skip); // Skip further brackets.
246
247 __ z_cli(0, signature, (int) '9');
248 __ z_brh(end_skip); // no optional size
249
250 __ z_cli(0, signature, (int) '0');
251 __ z_brnl(start_skip); // Skip optional size.
252
253 __ bind(end_skip);
254
255 __ z_cli(0, signature, (int) 'L');
256 __ z_brne(do_boxed); // If not array of objects: go directly to do_boxed.
257 }
258
259 // OOP argument
260 BIND(do_object);
261 // Pass by an object's type name.
262 {
263 Label L;
264
265 __ add2reg(sig_end, 4095, signature); // Assume object type name is shorter than 4k.
266 __ load_const_optimized(Z_R0, (int) ';'); // Type name terminator (must be in Z_R0!).
267 __ MacroAssembler::search_string(sig_end, signature);
268 __ z_brl(L);
269 __ z_illtrap(); // No semicolon found: internal error or object name too long.
270 __ bind(L);
271 __ z_lgr(signature, sig_end);
272 // fallthru to do_boxed
273 }
274
275 // Need to box the Java object here, so we use arg_java
276 // (address of current Java stack slot) as argument and
277 // don't dereference it as in case of ints, floats, etc..
278
279 // UNBOX argument
280 // Load reference and check for NULL.
281 Label do_int_Entry4Boxed;
282 __ bind(do_boxed);
283 {
284 __ load_and_test_long(intSlot, Address(arg_java));
285 __ z_bre(do_int_Entry4Boxed);
286 __ z_lgr(intSlot, arg_java);
287 __ z_bru(do_int_Entry4Boxed);
288 }
289
290 // INT argument
291
292 // (also for byte, boolean, char, short)
293 // Use lgf for load (sign-extend) and stg for store.
294 BIND(do_int);
295 __ z_lgf(intSlot, 0, arg_java);
296
297 __ bind(do_int_Entry4Boxed);
298 __ add2reg(arg_java, -BytesPerWord);
299 // If argument fits into argument register, go and handle it, otherwise continue.
300 __ compare32_and_branch(argcnt, max_int_register_arguments,
301 Assembler::bcondLow, move_intSlot_to_ARG);
302 __ z_stg(intSlot, 0, arg_c);
303 __ add2reg(arg_c, BytesPerWord);
304 __ z_bru(loop_start);
305
306 // LONG argument
307
308 BIND(do_long);
309 __ add2reg(arg_java, -2*BytesPerWord); // Decrement first to have positive displacement for lg.
310 __ z_lg(intSlot, BytesPerWord, arg_java);
311 // If argument fits into argument register, go and handle it, otherwise continue.
312 __ compare32_and_branch(argcnt, max_int_register_arguments,
313 Assembler::bcondLow, move_intSlot_to_ARG);
314 __ z_stg(intSlot, 0, arg_c);
315 __ add2reg(arg_c, BytesPerWord);
316 __ z_bru(loop_start);
317
318 // FLOAT argumen
319
320 BIND(do_float);
321 __ z_le(floatSlot, 0, arg_java);
322 __ add2reg(arg_java, -BytesPerWord);
323 assert(max_fp_register_arguments <= 255, "always true"); // safety net
324 __ z_cli(d_fpcnt+7, Z_SP, max_fp_register_arguments);
325 __ z_brl(move_floatSlot_to_FARG);
326 __ z_ste(floatSlot, 4, arg_c);
327 __ add2reg(arg_c, BytesPerWord);
328 __ z_bru(loop_start);
329
330 // DOUBLE argument
331
332 BIND(do_double);
333 __ add2reg(arg_java, -2*BytesPerWord); // Decrement first to have positive displacement for lg.
334 __ z_ld(floatSlot, BytesPerWord, arg_java);
335 assert(max_fp_register_arguments <= 255, "always true"); // safety net
336 __ z_cli(d_fpcnt+7, Z_SP, max_fp_register_arguments);
337 __ z_brl(move_floatSlot_to_FARG);
338 __ z_std(floatSlot, 0, arg_c);
339 __ add2reg(arg_c, BytesPerWord);
340 __ z_bru(loop_start);
341
342 // Method exit, all arguments proocessed.
343 __ bind(loop_end);
344 __ z_lmg(Z_R10, Z_R13, frame::z_abi_160_size, Z_SP); // restore registers before frame is popped.
345 __ pop_frame();
346 __ restore_return_pc();
347 __ z_br(Z_R14);
348
349 // Copy int arguments.
350
351 Label iarg_caselist; // Distance between each case has to be a power of 2
352 // (= 1 << LogSizeOfCase).
353 __ align(16);
354 BIND(iarg_caselist);
355 __ z_lgr(Z_ARG3, intSlot); // 4 bytes
356 __ z_bru(loop_start_restore); // 4 bytes
357
358 __ z_lgr(Z_ARG4, intSlot);
359 __ z_bru(loop_start_restore);
360
361 __ z_lgr(Z_ARG5, intSlot);
362 __ z_bru(loop_start_restore);
363
364 __ align(16);
365 __ bind(move_intSlot_to_ARG);
366 __ z_stg(signature, d_signature, Z_SP); // Spill since signature == Z_R1_scratch.
367 __ z_larl(Z_R1_scratch, iarg_caselist);
368 __ z_sllg(Z_R0_scratch, argcnt, LogSizeOfCase);
369 __ add2reg(argcnt, 1);
370 __ z_agr(Z_R1_scratch, Z_R0_scratch);
371 __ z_bcr(Assembler::bcondAlways, Z_R1_scratch);
372
373 // Copy float arguments.
374
375 Label farg_caselist; // Distance between each case has to be a power of 2
376 // (= 1 << logSizeOfCase, padded with nop.
377 __ align(16);
378 BIND(farg_caselist);
379 __ z_ldr(Z_FARG1, floatSlot); // 2 bytes
380 __ z_bru(loop_start_restore); // 4 bytes
381 __ z_nop(); // 2 bytes
382
383 __ z_ldr(Z_FARG2, floatSlot);
384 __ z_bru(loop_start_restore);
385 __ z_nop();
386
387 __ z_ldr(Z_FARG3, floatSlot);
388 __ z_bru(loop_start_restore);
389 __ z_nop();
390
391 __ z_ldr(Z_FARG4, floatSlot);
392 __ z_bru(loop_start_restore);
393 __ z_nop();
394
395 __ align(16);
396 __ bind(move_floatSlot_to_FARG);
397 __ z_stg(signature, d_signature, Z_SP); // Spill since signature == Z_R1_scratch.
398 __ z_lg(Z_R0_scratch, d_fpcnt, Z_SP); // Need old value for indexing.
399 __ add2mem_64(Address(Z_SP, d_fpcnt), 1, Z_R1_scratch); // Increment index.
400 __ z_larl(Z_R1_scratch, farg_caselist);
401 __ z_sllg(Z_R0_scratch, Z_R0_scratch, LogSizeOfCase);
402 __ z_agr(Z_R1_scratch, Z_R0_scratch);
403 __ z_bcr(Assembler::bcondAlways, Z_R1_scratch);
404
405 BLOCK_COMMENT("} slow_signature_handler");
406
407 return __ addr_at(entry_offset);
408 }
409
generate_result_handler_for(BasicType type)410 address TemplateInterpreterGenerator::generate_result_handler_for (BasicType type) {
411 address entry = __ pc();
412
413 assert(Z_tos == Z_RET, "Result handler: must move result!");
414 assert(Z_ftos == Z_FRET, "Result handler: must move float result!");
415
416 switch (type) {
417 case T_BOOLEAN:
418 __ c2bool(Z_tos);
419 break;
420 case T_CHAR:
421 __ and_imm(Z_tos, 0xffff);
422 break;
423 case T_BYTE:
424 __ z_lbr(Z_tos, Z_tos);
425 break;
426 case T_SHORT:
427 __ z_lhr(Z_tos, Z_tos);
428 break;
429 case T_INT:
430 case T_LONG:
431 case T_VOID:
432 case T_FLOAT:
433 case T_DOUBLE:
434 break;
435 case T_OBJECT:
436 // Retrieve result from frame...
437 __ mem2reg_opt(Z_tos, Address(Z_fp, oop_tmp_offset));
438 // and verify it.
439 __ verify_oop(Z_tos);
440 break;
441 default:
442 ShouldNotReachHere();
443 }
444 __ z_br(Z_R14); // Return from result handler.
445 return entry;
446 }
447
448 // Abstract method entry.
449 // Attempt to execute abstract method. Throw exception.
generate_abstract_entry(void)450 address TemplateInterpreterGenerator::generate_abstract_entry(void) {
451 unsigned int entry_offset = __ offset();
452
453 // Caller could be the call_stub or a compiled method (x86 version is wrong!).
454
455 BLOCK_COMMENT("abstract_entry {");
456
457 // Implement call of InterpreterRuntime::throw_AbstractMethodError.
458 __ set_top_ijava_frame_at_SP_as_last_Java_frame(Z_SP, Z_R1);
459 __ save_return_pc(); // Save Z_R14.
460 __ push_frame_abi160(0); // Without new frame the RT call could overwrite the saved Z_R14.
461
462 __ call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_AbstractMethodErrorWithMethod),
463 Z_thread, Z_method);
464
465 __ pop_frame();
466 __ restore_return_pc(); // Restore Z_R14.
467 __ reset_last_Java_frame();
468
469 // Restore caller sp for c2i case.
470 __ resize_frame_absolute(Z_R10, Z_R0, true); // Cut the stack back to where the caller started.
471
472 // branch to SharedRuntime::generate_forward_exception() which handles all possible callers,
473 // i.e. call stub, compiled method, interpreted method.
474 __ load_absolute_address(Z_tmp_1, StubRoutines::forward_exception_entry());
475 __ z_br(Z_tmp_1);
476
477 BLOCK_COMMENT("} abstract_entry");
478
479 return __ addr_at(entry_offset);
480 }
481
generate_Reference_get_entry(void)482 address TemplateInterpreterGenerator::generate_Reference_get_entry(void) {
483 // Inputs:
484 // Z_ARG1 - receiver
485 //
486 // What we do:
487 // - Load the referent field address.
488 // - Load the value in the referent field.
489 // - Pass that value to the pre-barrier.
490 //
491 // In the case of G1 this will record the value of the
492 // referent in an SATB buffer if marking is active.
493 // This will cause concurrent marking to mark the referent
494 // field as live.
495
496 Register scratch1 = Z_tmp_2;
497 Register scratch2 = Z_tmp_3;
498 Register pre_val = Z_RET; // return value
499 // Z_esp is callers operand stack pointer, i.e. it points to the parameters.
500 Register Rargp = Z_esp;
501
502 Label slow_path;
503 address entry = __ pc();
504
505 const int referent_offset = java_lang_ref_Reference::referent_offset();
506
507 BLOCK_COMMENT("Reference_get {");
508
509 // If the receiver is null then it is OK to jump to the slow path.
510 __ load_and_test_long(pre_val, Address(Rargp, Interpreter::stackElementSize)); // Get receiver.
511 __ z_bre(slow_path);
512
513 // Load the value of the referent field.
514 __ load_heap_oop(pre_val, Address(pre_val, referent_offset), scratch1, scratch2, ON_WEAK_OOP_REF);
515
516 // Restore caller sp for c2i case.
517 __ resize_frame_absolute(Z_R10, Z_R0, true); // Cut the stack back to where the caller started.
518 __ z_br(Z_R14);
519
520 // Branch to previously generated regular method entry.
521 __ bind(slow_path);
522
523 address meth_entry = Interpreter::entry_for_kind(Interpreter::zerolocals);
524 __ jump_to_entry(meth_entry, Z_R1);
525
526 BLOCK_COMMENT("} Reference_get");
527
528 return entry;
529 }
530
generate_StackOverflowError_handler()531 address TemplateInterpreterGenerator::generate_StackOverflowError_handler() {
532 address entry = __ pc();
533
534 DEBUG_ONLY(__ verify_esp(Z_esp, Z_ARG5));
535
536 // Restore bcp under the assumption that the current frame is still
537 // interpreted.
538 __ restore_bcp();
539
540 // Expression stack must be empty before entering the VM if an
541 // exception happened.
542 __ empty_expression_stack();
543 // Throw exception.
544 __ call_VM(noreg,
545 CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_StackOverflowError));
546 return entry;
547 }
548
549 //
550 // Args:
551 // Z_ARG2: oop of array
552 // Z_ARG3: aberrant index
553 //
generate_ArrayIndexOutOfBounds_handler()554 address TemplateInterpreterGenerator::generate_ArrayIndexOutOfBounds_handler() {
555 address entry = __ pc();
556 address excp = CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_ArrayIndexOutOfBoundsException);
557
558 // Expression stack must be empty before entering the VM if an
559 // exception happened.
560 __ empty_expression_stack();
561
562 // Setup parameters.
563 // Pass register with array to create more detailed exceptions.
564 __ call_VM(noreg, excp, Z_ARG2, Z_ARG3);
565 return entry;
566 }
567
generate_ClassCastException_handler()568 address TemplateInterpreterGenerator::generate_ClassCastException_handler() {
569 address entry = __ pc();
570
571 // Object is at TOS.
572 __ pop_ptr(Z_ARG2);
573
574 // Expression stack must be empty before entering the VM if an
575 // exception happened.
576 __ empty_expression_stack();
577
578 __ call_VM(Z_ARG1,
579 CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_ClassCastException),
580 Z_ARG2);
581
582 DEBUG_ONLY(__ should_not_reach_here();)
583
584 return entry;
585 }
586
generate_exception_handler_common(const char * name,const char * message,bool pass_oop)587 address TemplateInterpreterGenerator::generate_exception_handler_common(const char* name, const char* message, bool pass_oop) {
588 assert(!pass_oop || message == NULL, "either oop or message but not both");
589 address entry = __ pc();
590
591 BLOCK_COMMENT("exception_handler_common {");
592
593 // Expression stack must be empty before entering the VM if an
594 // exception happened.
595 __ empty_expression_stack();
596 if (name != NULL) {
597 __ load_absolute_address(Z_ARG2, (address)name);
598 } else {
599 __ clear_reg(Z_ARG2, true, false);
600 }
601
602 if (pass_oop) {
603 __ call_VM(Z_tos,
604 CAST_FROM_FN_PTR(address, InterpreterRuntime::create_klass_exception),
605 Z_ARG2, Z_tos /*object (see TT::aastore())*/);
606 } else {
607 if (message != NULL) {
608 __ load_absolute_address(Z_ARG3, (address)message);
609 } else {
610 __ clear_reg(Z_ARG3, true, false);
611 }
612 __ call_VM(Z_tos,
613 CAST_FROM_FN_PTR(address, InterpreterRuntime::create_exception),
614 Z_ARG2, Z_ARG3);
615 }
616 // Throw exception.
617 __ load_absolute_address(Z_R1_scratch, Interpreter::throw_exception_entry());
618 __ z_br(Z_R1_scratch);
619
620 BLOCK_COMMENT("} exception_handler_common");
621
622 return entry;
623 }
624
generate_return_entry_for(TosState state,int step,size_t index_size)625 address TemplateInterpreterGenerator::generate_return_entry_for (TosState state, int step, size_t index_size) {
626 address entry = __ pc();
627
628 BLOCK_COMMENT("return_entry {");
629
630 // Pop i2c extension or revert top-2-parent-resize done by interpreted callees.
631 Register sp_before_i2c_extension = Z_bcp;
632 __ z_lg(Z_fp, _z_abi(callers_sp), Z_SP); // Restore frame pointer.
633 __ z_lg(sp_before_i2c_extension, Address(Z_fp, _z_ijava_state_neg(top_frame_sp)));
634 __ resize_frame_absolute(sp_before_i2c_extension, Z_locals/*tmp*/, true/*load_fp*/);
635
636 // TODO(ZASM): necessary??
637 // // and NULL it as marker that esp is now tos until next java call
638 // __ movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), (int32_t)NULL_WORD);
639
640 __ restore_bcp();
641 __ restore_locals();
642 __ restore_esp();
643
644 if (state == atos) {
645 __ profile_return_type(Z_tmp_1, Z_tos, Z_tmp_2);
646 }
647
648 Register cache = Z_tmp_1;
649 Register size = Z_tmp_1;
650 Register offset = Z_tmp_2;
651 const int flags_offset = in_bytes(ConstantPoolCache::base_offset() +
652 ConstantPoolCacheEntry::flags_offset());
653 __ get_cache_and_index_at_bcp(cache, offset, 1, index_size);
654
655 // #args is in rightmost byte of the _flags field.
656 __ z_llgc(size, Address(cache, offset, flags_offset+(sizeof(size_t)-1)));
657 __ z_sllg(size, size, Interpreter::logStackElementSize); // Each argument size in bytes.
658 __ z_agr(Z_esp, size); // Pop arguments.
659
660 __ check_and_handle_popframe(Z_thread);
661 __ check_and_handle_earlyret(Z_thread);
662
663 __ dispatch_next(state, step);
664
665 BLOCK_COMMENT("} return_entry");
666
667 return entry;
668 }
669
generate_deopt_entry_for(TosState state,int step,address continuation)670 address TemplateInterpreterGenerator::generate_deopt_entry_for(TosState state,
671 int step,
672 address continuation) {
673 address entry = __ pc();
674
675 BLOCK_COMMENT("deopt_entry {");
676
677 // TODO(ZASM): necessary? NULL last_sp until next java call
678 // __ movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), (int32_t)NULL_WORD);
679 __ z_lg(Z_fp, _z_abi(callers_sp), Z_SP); // Restore frame pointer.
680 __ restore_bcp();
681 __ restore_locals();
682 __ restore_esp();
683
684 // Handle exceptions.
685 {
686 Label L;
687 __ load_and_test_long(Z_R0/*pending_exception*/, thread_(pending_exception));
688 __ z_bre(L);
689 __ call_VM(noreg,
690 CAST_FROM_FN_PTR(address,
691 InterpreterRuntime::throw_pending_exception));
692 __ should_not_reach_here();
693 __ bind(L);
694 }
695 if (continuation == NULL) {
696 __ dispatch_next(state, step);
697 } else {
698 __ jump_to_entry(continuation, Z_R1_scratch);
699 }
700
701 BLOCK_COMMENT("} deopt_entry");
702
703 return entry;
704 }
705
generate_safept_entry_for(TosState state,address runtime_entry)706 address TemplateInterpreterGenerator::generate_safept_entry_for (TosState state,
707 address runtime_entry) {
708 address entry = __ pc();
709 __ push(state);
710 __ call_VM(noreg, runtime_entry);
711 __ dispatch_via(vtos, Interpreter::_normal_table.table_for (vtos));
712 return entry;
713 }
714
715 //
716 // Helpers for commoning out cases in the various type of method entries.
717 //
718
719 // Increment invocation count & check for overflow.
720 //
721 // Note: checking for negative value instead of overflow
722 // so we have a 'sticky' overflow test.
723 //
724 // Z_ARG2: method (see generate_fixed_frame())
725 //
generate_counter_incr(Label * overflow,Label * profile_method,Label * profile_method_continue)726 void TemplateInterpreterGenerator::generate_counter_incr(Label* overflow, Label* profile_method, Label* profile_method_continue) {
727 Label done;
728 Register method = Z_ARG2; // Generate_fixed_frame() copies Z_method into Z_ARG2.
729 Register m_counters = Z_ARG4;
730
731 BLOCK_COMMENT("counter_incr {");
732
733 // Note: In tiered we increment either counters in method or in MDO depending
734 // if we are profiling or not.
735 if (TieredCompilation) {
736 int increment = InvocationCounter::count_increment;
737 if (ProfileInterpreter) {
738 NearLabel no_mdo;
739 Register mdo = m_counters;
740 // Are we profiling?
741 __ load_and_test_long(mdo, method2_(method, method_data));
742 __ branch_optimized(Assembler::bcondZero, no_mdo);
743 // Increment counter in the MDO.
744 const Address mdo_invocation_counter(mdo, MethodData::invocation_counter_offset() +
745 InvocationCounter::counter_offset());
746 const Address mask(mdo, MethodData::invoke_mask_offset());
747 __ increment_mask_and_jump(mdo_invocation_counter, increment, mask,
748 Z_R1_scratch, false, Assembler::bcondZero,
749 overflow);
750 __ z_bru(done);
751 __ bind(no_mdo);
752 }
753
754 // Increment counter in MethodCounters.
755 const Address invocation_counter(m_counters,
756 MethodCounters::invocation_counter_offset() +
757 InvocationCounter::counter_offset());
758 // Get address of MethodCounters object.
759 __ get_method_counters(method, m_counters, done);
760 const Address mask(m_counters, MethodCounters::invoke_mask_offset());
761 __ increment_mask_and_jump(invocation_counter,
762 increment, mask,
763 Z_R1_scratch, false, Assembler::bcondZero,
764 overflow);
765 } else {
766 Register counter_sum = Z_ARG3; // The result of this piece of code.
767 Register tmp = Z_R1_scratch;
768 #ifdef ASSERT
769 {
770 NearLabel ok;
771 __ get_method(tmp);
772 __ compare64_and_branch(method, tmp, Assembler::bcondEqual, ok);
773 __ z_illtrap(0x66);
774 __ bind(ok);
775 }
776 #endif
777
778 // Get address of MethodCounters object.
779 __ get_method_counters(method, m_counters, done);
780 // Update standard invocation counters.
781 __ increment_invocation_counter(m_counters, counter_sum);
782 if (ProfileInterpreter) {
783 __ add2mem_32(Address(m_counters, MethodCounters::interpreter_invocation_counter_offset()), 1, tmp);
784 if (profile_method != NULL) {
785 const Address profile_limit(m_counters, MethodCounters::interpreter_profile_limit_offset());
786 __ z_cl(counter_sum, profile_limit);
787 __ branch_optimized(Assembler::bcondLow, *profile_method_continue);
788 // If no method data exists, go to profile_method.
789 __ test_method_data_pointer(tmp, *profile_method);
790 }
791 }
792
793 const Address invocation_limit(m_counters, MethodCounters::interpreter_invocation_limit_offset());
794 __ z_cl(counter_sum, invocation_limit);
795 __ branch_optimized(Assembler::bcondNotLow, *overflow);
796 }
797
798 __ bind(done);
799
800 BLOCK_COMMENT("} counter_incr");
801 }
802
generate_counter_overflow(Label & do_continue)803 void TemplateInterpreterGenerator::generate_counter_overflow(Label& do_continue) {
804 // InterpreterRuntime::frequency_counter_overflow takes two
805 // arguments, the first (thread) is passed by call_VM, the second
806 // indicates if the counter overflow occurs at a backwards branch
807 // (NULL bcp). We pass zero for it. The call returns the address
808 // of the verified entry point for the method or NULL if the
809 // compilation did not complete (either went background or bailed
810 // out).
811 __ clear_reg(Z_ARG2);
812 __ call_VM(noreg,
813 CAST_FROM_FN_PTR(address, InterpreterRuntime::frequency_counter_overflow),
814 Z_ARG2);
815 __ z_bru(do_continue);
816 }
817
generate_stack_overflow_check(Register frame_size,Register tmp1)818 void TemplateInterpreterGenerator::generate_stack_overflow_check(Register frame_size, Register tmp1) {
819 Register tmp2 = Z_R1_scratch;
820 const int page_size = os::vm_page_size();
821 NearLabel after_frame_check;
822
823 BLOCK_COMMENT("stack_overflow_check {");
824
825 assert_different_registers(frame_size, tmp1);
826
827 // Stack banging is sufficient overflow check if frame_size < page_size.
828 if (Immediate::is_uimm(page_size, 15)) {
829 __ z_chi(frame_size, page_size);
830 __ z_brl(after_frame_check);
831 } else {
832 __ load_const_optimized(tmp1, page_size);
833 __ compareU32_and_branch(frame_size, tmp1, Assembler::bcondLow, after_frame_check);
834 }
835
836 // Get the stack base, and in debug, verify it is non-zero.
837 __ z_lg(tmp1, thread_(stack_base));
838 #ifdef ASSERT
839 address reentry = NULL;
840 NearLabel base_not_zero;
841 __ compareU64_and_branch(tmp1, (intptr_t)0L, Assembler::bcondNotEqual, base_not_zero);
842 reentry = __ stop_chain_static(reentry, "stack base is zero in generate_stack_overflow_check");
843 __ bind(base_not_zero);
844 #endif
845
846 // Get the stack size, and in debug, verify it is non-zero.
847 assert(sizeof(size_t) == sizeof(intptr_t), "wrong load size");
848 __ z_lg(tmp2, thread_(stack_size));
849 #ifdef ASSERT
850 NearLabel size_not_zero;
851 __ compareU64_and_branch(tmp2, (intptr_t)0L, Assembler::bcondNotEqual, size_not_zero);
852 reentry = __ stop_chain_static(reentry, "stack size is zero in generate_stack_overflow_check");
853 __ bind(size_not_zero);
854 #endif
855
856 // Compute the beginning of the protected zone minus the requested frame size.
857 __ z_sgr(tmp1, tmp2);
858 __ add2reg(tmp1, JavaThread::stack_guard_zone_size());
859
860 // Add in the size of the frame (which is the same as subtracting it from the
861 // SP, which would take another register.
862 __ z_agr(tmp1, frame_size);
863
864 // The frame is greater than one page in size, so check against
865 // the bottom of the stack.
866 __ compareU64_and_branch(Z_SP, tmp1, Assembler::bcondHigh, after_frame_check);
867
868 // The stack will overflow, throw an exception.
869
870 // Restore SP to sender's sp. This is necessary if the sender's frame is an
871 // extended compiled frame (see gen_c2i_adapter()) and safer anyway in case of
872 // JSR292 adaptations.
873 __ resize_frame_absolute(Z_R10, tmp1, true/*load_fp*/);
874
875 // Note also that the restored frame is not necessarily interpreted.
876 // Use the shared runtime version of the StackOverflowError.
877 assert(StubRoutines::throw_StackOverflowError_entry() != NULL, "stub not yet generated");
878 AddressLiteral stub(StubRoutines::throw_StackOverflowError_entry());
879 __ load_absolute_address(tmp1, StubRoutines::throw_StackOverflowError_entry());
880 __ z_br(tmp1);
881
882 // If you get to here, then there is enough stack space.
883 __ bind(after_frame_check);
884
885 BLOCK_COMMENT("} stack_overflow_check");
886 }
887
888 // Allocate monitor and lock method (asm interpreter).
889 //
890 // Args:
891 // Z_locals: locals
892
lock_method(void)893 void TemplateInterpreterGenerator::lock_method(void) {
894
895 BLOCK_COMMENT("lock_method {");
896
897 // Synchronize method.
898 const Register method = Z_tmp_2;
899 __ get_method(method);
900
901 #ifdef ASSERT
902 address reentry = NULL;
903 {
904 Label L;
905 __ testbit(method2_(method, access_flags), JVM_ACC_SYNCHRONIZED_BIT);
906 __ z_btrue(L);
907 reentry = __ stop_chain_static(reentry, "method doesn't need synchronization");
908 __ bind(L);
909 }
910 #endif // ASSERT
911
912 // Get synchronization object.
913 const Register object = Z_tmp_2;
914
915 {
916 Label done;
917 Label static_method;
918
919 __ testbit(method2_(method, access_flags), JVM_ACC_STATIC_BIT);
920 __ z_btrue(static_method);
921
922 // non-static method: Load receiver obj from stack.
923 __ mem2reg_opt(object, Address(Z_locals, Interpreter::local_offset_in_bytes(0)));
924 __ z_bru(done);
925
926 __ bind(static_method);
927
928 // Lock the java mirror.
929 // Load mirror from interpreter frame.
930 __ z_lg(object, _z_ijava_state_neg(mirror), Z_fp);
931
932 #ifdef ASSERT
933 {
934 NearLabel L;
935 __ compare64_and_branch(object, (intptr_t) 0, Assembler::bcondNotEqual, L);
936 reentry = __ stop_chain_static(reentry, "synchronization object is NULL");
937 __ bind(L);
938 }
939 #endif // ASSERT
940
941 __ bind(done);
942 }
943
944 __ add_monitor_to_stack(true, Z_ARG3, Z_ARG4, Z_ARG5); // Allocate monitor elem.
945 // Store object and lock it.
946 __ get_monitors(Z_tmp_1);
947 __ reg2mem_opt(object, Address(Z_tmp_1, BasicObjectLock::obj_offset_in_bytes()));
948 __ lock_object(Z_tmp_1, object);
949
950 BLOCK_COMMENT("} lock_method");
951 }
952
953 // Generate a fixed interpreter frame. This is identical setup for
954 // interpreted methods and for native methods hence the shared code.
955 //
956 // Registers alive
957 // Z_thread - JavaThread*
958 // Z_SP - old stack pointer
959 // Z_method - callee's method
960 // Z_esp - parameter list (slot 'above' last param)
961 // Z_R14 - return pc, to be stored in caller's frame
962 // Z_R10 - sender sp, note: Z_tmp_1 is Z_R10!
963 //
964 // Registers updated
965 // Z_SP - new stack pointer
966 // Z_esp - callee's operand stack pointer
967 // points to the slot above the value on top
968 // Z_locals - used to access locals: locals[i] := *(Z_locals - i*BytesPerWord)
969 // Z_bcp - the bytecode pointer
970 // Z_fp - the frame pointer, thereby killing Z_method
971 // Z_ARG2 - copy of Z_method
972 //
generate_fixed_frame(bool native_call)973 void TemplateInterpreterGenerator::generate_fixed_frame(bool native_call) {
974
975 // stack layout
976 //
977 // F1 [TOP_IJAVA_FRAME_ABI] <-- Z_SP, Z_R10 (see note below)
978 // [F1's operand stack (unused)]
979 // [F1's outgoing Java arguments] <-- Z_esp
980 // [F1's operand stack (non args)]
981 // [monitors] (optional)
982 // [IJAVA_STATE]
983 //
984 // F2 [PARENT_IJAVA_FRAME_ABI]
985 // ...
986 //
987 // 0x000
988 //
989 // Note: Z_R10, the sender sp, will be below Z_SP if F1 was extended by a c2i adapter.
990
991 //=============================================================================
992 // Allocate space for locals other than the parameters, the
993 // interpreter state, monitors, and the expression stack.
994
995 const Register local_count = Z_ARG5;
996 const Register fp = Z_tmp_2;
997 const Register const_method = Z_ARG1;
998
999 BLOCK_COMMENT("generate_fixed_frame {");
1000 {
1001 // local registers
1002 const Register top_frame_size = Z_ARG2;
1003 const Register sp_after_resize = Z_ARG3;
1004 const Register max_stack = Z_ARG4;
1005
1006 __ z_lg(const_method, Address(Z_method, Method::const_offset()));
1007 __ z_llgh(max_stack, Address(const_method, ConstMethod::size_of_parameters_offset()));
1008 __ z_sllg(Z_locals /*parameter_count bytes*/, max_stack /*parameter_count*/, LogBytesPerWord);
1009
1010 if (native_call) {
1011 // If we're calling a native method, we replace max_stack (which is
1012 // zero) with space for the worst-case signature handler varargs
1013 // vector, which is:
1014 // max_stack = max(Argument::n_register_parameters, parameter_count+2);
1015 //
1016 // We add two slots to the parameter_count, one for the jni
1017 // environment and one for a possible native mirror. We allocate
1018 // space for at least the number of ABI registers, even though
1019 // InterpreterRuntime::slow_signature_handler won't write more than
1020 // parameter_count+2 words when it creates the varargs vector at the
1021 // top of the stack. The generated slow signature handler will just
1022 // load trash into registers beyond the necessary number. We're
1023 // still going to cut the stack back by the ABI register parameter
1024 // count so as to get SP+16 pointing at the ABI outgoing parameter
1025 // area, so we need to allocate at least that much even though we're
1026 // going to throw it away.
1027 //
1028 __ add2reg(max_stack, 2);
1029
1030 NearLabel passing_args_on_stack;
1031
1032 // max_stack in bytes
1033 __ z_sllg(max_stack, max_stack, LogBytesPerWord);
1034
1035 int argument_registers_in_bytes = Argument::n_register_parameters << LogBytesPerWord;
1036 __ compare64_and_branch(max_stack, argument_registers_in_bytes, Assembler::bcondNotLow, passing_args_on_stack);
1037
1038 __ load_const_optimized(max_stack, argument_registers_in_bytes);
1039
1040 __ bind(passing_args_on_stack);
1041 } else {
1042 // !native_call
1043 // local_count = method->constMethod->max_locals();
1044 __ z_llgh(local_count, Address(const_method, ConstMethod::size_of_locals_offset()));
1045
1046 // Calculate number of non-parameter locals (in slots):
1047 __ z_sgr(local_count, max_stack);
1048
1049 // max_stack = method->max_stack();
1050 __ z_llgh(max_stack, Address(const_method, ConstMethod::max_stack_offset()));
1051 // max_stack in bytes
1052 __ z_sllg(max_stack, max_stack, LogBytesPerWord);
1053 }
1054
1055 // Resize (i.e. normally shrink) the top frame F1 ...
1056 // F1 [TOP_IJAVA_FRAME_ABI] <-- Z_SP, Z_R10
1057 // F1's operand stack (free)
1058 // ...
1059 // F1's operand stack (free) <-- Z_esp
1060 // F1's outgoing Java arg m
1061 // ...
1062 // F1's outgoing Java arg 0
1063 // ...
1064 //
1065 // ... into a parent frame (Z_R10 holds F1's SP before any modification, see also above)
1066 //
1067 // +......................+
1068 // : : <-- Z_R10, saved below as F0's z_ijava_state.sender_sp
1069 // : :
1070 // F1 [PARENT_IJAVA_FRAME_ABI] <-- Z_SP \
1071 // F0's non arg local | = delta
1072 // ... |
1073 // F0's non arg local <-- Z_esp /
1074 // F1's outgoing Java arg m
1075 // ...
1076 // F1's outgoing Java arg 0
1077 // ...
1078 //
1079 // then push the new top frame F0.
1080 //
1081 // F0 [TOP_IJAVA_FRAME_ABI] = frame::z_top_ijava_frame_abi_size \
1082 // [operand stack] = max_stack | = top_frame_size
1083 // [IJAVA_STATE] = frame::z_ijava_state_size /
1084
1085 // sp_after_resize = Z_esp - delta
1086 //
1087 // delta = PARENT_IJAVA_FRAME_ABI + (locals_count - params_count)
1088
1089 __ add2reg(sp_after_resize, (Interpreter::stackElementSize) - (frame::z_parent_ijava_frame_abi_size), Z_esp);
1090 if (!native_call) {
1091 __ z_sllg(Z_R0_scratch, local_count, LogBytesPerWord); // Params have already been subtracted from local_count.
1092 __ z_slgr(sp_after_resize, Z_R0_scratch);
1093 }
1094
1095 // top_frame_size = TOP_IJAVA_FRAME_ABI + max_stack + size of interpreter state
1096 __ add2reg(top_frame_size,
1097 frame::z_top_ijava_frame_abi_size +
1098 frame::z_ijava_state_size,
1099 max_stack);
1100
1101 if (!native_call) {
1102 // Stack overflow check.
1103 // Native calls don't need the stack size check since they have no
1104 // expression stack and the arguments are already on the stack and
1105 // we only add a handful of words to the stack.
1106 Register frame_size = max_stack; // Reuse the register for max_stack.
1107 __ z_lgr(frame_size, Z_SP);
1108 __ z_sgr(frame_size, sp_after_resize);
1109 __ z_agr(frame_size, top_frame_size);
1110 generate_stack_overflow_check(frame_size, fp/*tmp1*/);
1111 }
1112
1113 DEBUG_ONLY(__ z_cg(Z_R14, _z_abi16(return_pc), Z_SP));
1114 __ asm_assert_eq("killed Z_R14", 0);
1115 __ resize_frame_absolute(sp_after_resize, fp, true);
1116 __ save_return_pc(Z_R14);
1117
1118 // ... and push the new frame F0.
1119 __ push_frame(top_frame_size, fp, true /*copy_sp*/, false);
1120 }
1121
1122 //=============================================================================
1123 // Initialize the new frame F0: initialize interpreter state.
1124
1125 {
1126 // locals
1127 const Register local_addr = Z_ARG4;
1128
1129 BLOCK_COMMENT("generate_fixed_frame: initialize interpreter state {");
1130
1131 #ifdef ASSERT
1132 // Set the magic number (using local_addr as tmp register).
1133 __ load_const_optimized(local_addr, frame::z_istate_magic_number);
1134 __ z_stg(local_addr, _z_ijava_state_neg(magic), fp);
1135 #endif
1136
1137 // Save sender SP from F1 (i.e. before it was potentially modified by an
1138 // adapter) into F0's interpreter state. We use it as well to revert
1139 // resizing the frame above.
1140 __ z_stg(Z_R10, _z_ijava_state_neg(sender_sp), fp);
1141
1142 // Load cp cache and save it at the end of this block.
1143 __ z_lg(Z_R1_scratch, Address(const_method, ConstMethod::constants_offset()));
1144 __ z_lg(Z_R1_scratch, Address(Z_R1_scratch, ConstantPool::cache_offset_in_bytes()));
1145
1146 // z_ijava_state->method = method;
1147 __ z_stg(Z_method, _z_ijava_state_neg(method), fp);
1148
1149 // Point locals at the first argument. Method's locals are the
1150 // parameters on top of caller's expression stack.
1151 // Tos points past last Java argument.
1152
1153 __ z_agr(Z_locals, Z_esp);
1154 // z_ijava_state->locals - i*BytesPerWord points to i-th Java local (i starts at 0)
1155 // z_ijava_state->locals = Z_esp + parameter_count bytes
1156 __ z_stg(Z_locals, _z_ijava_state_neg(locals), fp);
1157
1158 // z_ijava_state->oop_temp = NULL;
1159 __ store_const(Address(fp, oop_tmp_offset), 0);
1160
1161 // Initialize z_ijava_state->mdx.
1162 Register Rmdp = Z_bcp;
1163 // native_call: assert that mdo == NULL
1164 const bool check_for_mdo = !native_call DEBUG_ONLY(|| native_call);
1165 if (ProfileInterpreter && check_for_mdo) {
1166 Label get_continue;
1167
1168 __ load_and_test_long(Rmdp, method_(method_data));
1169 __ z_brz(get_continue);
1170 DEBUG_ONLY(if (native_call) __ stop("native methods don't have a mdo"));
1171 __ add2reg(Rmdp, in_bytes(MethodData::data_offset()));
1172 __ bind(get_continue);
1173 }
1174 __ z_stg(Rmdp, _z_ijava_state_neg(mdx), fp);
1175
1176 // Initialize z_ijava_state->bcp and Z_bcp.
1177 if (native_call) {
1178 __ clear_reg(Z_bcp); // Must initialize. Will get written into frame where GC reads it.
1179 } else {
1180 __ add2reg(Z_bcp, in_bytes(ConstMethod::codes_offset()), const_method);
1181 }
1182 __ z_stg(Z_bcp, _z_ijava_state_neg(bcp), fp);
1183
1184 // no monitors and empty operand stack
1185 // => z_ijava_state->monitors points to the top slot in IJAVA_STATE.
1186 // => Z_ijava_state->esp points one slot above into the operand stack.
1187 // z_ijava_state->monitors = fp - frame::z_ijava_state_size - Interpreter::stackElementSize;
1188 // z_ijava_state->esp = Z_esp = z_ijava_state->monitors;
1189 __ add2reg(Z_esp, -frame::z_ijava_state_size, fp);
1190 __ z_stg(Z_esp, _z_ijava_state_neg(monitors), fp);
1191 __ add2reg(Z_esp, -Interpreter::stackElementSize);
1192 __ z_stg(Z_esp, _z_ijava_state_neg(esp), fp);
1193
1194 // z_ijava_state->cpoolCache = Z_R1_scratch (see load above);
1195 __ z_stg(Z_R1_scratch, _z_ijava_state_neg(cpoolCache), fp);
1196
1197 // Get mirror and store it in the frame as GC root for this Method*.
1198 __ load_mirror_from_const_method(Z_R1_scratch, const_method);
1199 __ z_stg(Z_R1_scratch, _z_ijava_state_neg(mirror), fp);
1200
1201 BLOCK_COMMENT("} generate_fixed_frame: initialize interpreter state");
1202
1203 //=============================================================================
1204 if (!native_call) {
1205 // Local_count is already num_locals_slots - num_param_slots.
1206 // Start of locals: local_addr = Z_locals - locals size + 1 slot
1207 __ z_llgh(Z_R0_scratch, Address(const_method, ConstMethod::size_of_locals_offset()));
1208 __ add2reg(local_addr, BytesPerWord, Z_locals);
1209 __ z_sllg(Z_R0_scratch, Z_R0_scratch, LogBytesPerWord);
1210 __ z_sgr(local_addr, Z_R0_scratch);
1211
1212 __ Clear_Array(local_count, local_addr, Z_ARG2);
1213 }
1214
1215 }
1216 // Finally set the frame pointer, destroying Z_method.
1217 assert(Z_fp == Z_method, "maybe set Z_fp earlier if other register than Z_method");
1218 // Oprofile analysis suggests to keep a copy in a register to be used by
1219 // generate_counter_incr().
1220 __ z_lgr(Z_ARG2, Z_method);
1221 __ z_lgr(Z_fp, fp);
1222
1223 BLOCK_COMMENT("} generate_fixed_frame");
1224 }
1225
1226 // Various method entries
1227
1228 // Math function, frame manager must set up an interpreter state, etc.
generate_math_entry(AbstractInterpreter::MethodKind kind)1229 address TemplateInterpreterGenerator::generate_math_entry(AbstractInterpreter::MethodKind kind) {
1230
1231 // Decide what to do: Use same platform specific instructions and runtime calls as compilers.
1232 bool use_instruction = false;
1233 address runtime_entry = NULL;
1234 int num_args = 1;
1235 bool double_precision = true;
1236
1237 // s390 specific:
1238 switch (kind) {
1239 case Interpreter::java_lang_math_sqrt:
1240 case Interpreter::java_lang_math_abs: use_instruction = true; break;
1241 case Interpreter::java_lang_math_fmaF:
1242 case Interpreter::java_lang_math_fmaD: use_instruction = UseFMA; break;
1243 default: break; // Fall back to runtime call.
1244 }
1245
1246 switch (kind) {
1247 case Interpreter::java_lang_math_sin : runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dsin); break;
1248 case Interpreter::java_lang_math_cos : runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dcos); break;
1249 case Interpreter::java_lang_math_tan : runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dtan); break;
1250 case Interpreter::java_lang_math_abs : /* run interpreted */ break;
1251 case Interpreter::java_lang_math_sqrt : /* runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dsqrt); not available */ break;
1252 case Interpreter::java_lang_math_log : runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dlog); break;
1253 case Interpreter::java_lang_math_log10: runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dlog10); break;
1254 case Interpreter::java_lang_math_pow : runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dpow); num_args = 2; break;
1255 case Interpreter::java_lang_math_exp : runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dexp); break;
1256 case Interpreter::java_lang_math_fmaF : /* run interpreted */ num_args = 3; double_precision = false; break;
1257 case Interpreter::java_lang_math_fmaD : /* run interpreted */ num_args = 3; break;
1258 default: ShouldNotReachHere();
1259 }
1260
1261 // Use normal entry if neither instruction nor runtime call is used.
1262 if (!use_instruction && runtime_entry == NULL) return NULL;
1263
1264 address entry = __ pc();
1265
1266 if (use_instruction) {
1267 switch (kind) {
1268 case Interpreter::java_lang_math_sqrt:
1269 // Can use memory operand directly.
1270 __ z_sqdb(Z_FRET, Interpreter::stackElementSize, Z_esp);
1271 break;
1272 case Interpreter::java_lang_math_abs:
1273 // Load operand from stack.
1274 __ mem2freg_opt(Z_FRET, Address(Z_esp, Interpreter::stackElementSize));
1275 __ z_lpdbr(Z_FRET);
1276 break;
1277 case Interpreter::java_lang_math_fmaF:
1278 __ mem2freg_opt(Z_FRET, Address(Z_esp, Interpreter::stackElementSize)); // result reg = arg3
1279 __ mem2freg_opt(Z_FARG2, Address(Z_esp, 3 * Interpreter::stackElementSize)); // arg1
1280 __ z_maeb(Z_FRET, Z_FARG2, Address(Z_esp, 2 * Interpreter::stackElementSize));
1281 break;
1282 case Interpreter::java_lang_math_fmaD:
1283 __ mem2freg_opt(Z_FRET, Address(Z_esp, Interpreter::stackElementSize)); // result reg = arg3
1284 __ mem2freg_opt(Z_FARG2, Address(Z_esp, 5 * Interpreter::stackElementSize)); // arg1
1285 __ z_madb(Z_FRET, Z_FARG2, Address(Z_esp, 3 * Interpreter::stackElementSize));
1286 break;
1287 default: ShouldNotReachHere();
1288 }
1289 } else {
1290 // Load arguments
1291 assert(num_args <= 4, "passed in registers");
1292 if (double_precision) {
1293 int offset = (2 * num_args - 1) * Interpreter::stackElementSize;
1294 for (int i = 0; i < num_args; ++i) {
1295 __ mem2freg_opt(as_FloatRegister(Z_FARG1->encoding() + 2 * i), Address(Z_esp, offset));
1296 offset -= 2 * Interpreter::stackElementSize;
1297 }
1298 } else {
1299 int offset = num_args * Interpreter::stackElementSize;
1300 for (int i = 0; i < num_args; ++i) {
1301 __ mem2freg_opt(as_FloatRegister(Z_FARG1->encoding() + 2 * i), Address(Z_esp, offset));
1302 offset -= Interpreter::stackElementSize;
1303 }
1304 }
1305 // Call runtime
1306 __ save_return_pc(); // Save Z_R14.
1307 __ push_frame_abi160(0); // Without new frame the RT call could overwrite the saved Z_R14.
1308
1309 __ call_VM_leaf(runtime_entry);
1310
1311 __ pop_frame();
1312 __ restore_return_pc(); // Restore Z_R14.
1313 }
1314
1315 // Pop c2i arguments (if any) off when we return.
1316 __ resize_frame_absolute(Z_R10, Z_R0, true); // Cut the stack back to where the caller started.
1317
1318 __ z_br(Z_R14);
1319
1320 return entry;
1321 }
1322
1323 // Interpreter stub for calling a native method. (asm interpreter).
1324 // This sets up a somewhat different looking stack for calling the
1325 // native method than the typical interpreter frame setup.
generate_native_entry(bool synchronized)1326 address TemplateInterpreterGenerator::generate_native_entry(bool synchronized) {
1327 // Determine code generation flags.
1328 bool inc_counter = UseCompiler || CountCompiledCalls || LogTouchedMethods;
1329
1330 // Interpreter entry for ordinary Java methods.
1331 //
1332 // Registers alive
1333 // Z_SP - stack pointer
1334 // Z_thread - JavaThread*
1335 // Z_method - callee's method (method to be invoked)
1336 // Z_esp - operand (or expression) stack pointer of caller. one slot above last arg.
1337 // Z_R10 - sender sp (before modifications, e.g. by c2i adapter
1338 // and as well by generate_fixed_frame below)
1339 // Z_R14 - return address to caller (call_stub or c2i_adapter)
1340 //
1341 // Registers updated
1342 // Z_SP - stack pointer
1343 // Z_fp - callee's framepointer
1344 // Z_esp - callee's operand stack pointer
1345 // points to the slot above the value on top
1346 // Z_locals - used to access locals: locals[i] := *(Z_locals - i*BytesPerWord)
1347 // Z_tos - integer result, if any
1348 // z_ftos - floating point result, if any
1349 //
1350 // Stack layout at this point:
1351 //
1352 // F1 [TOP_IJAVA_FRAME_ABI] <-- Z_SP, Z_R10 (Z_R10 will be below Z_SP if
1353 // frame was extended by c2i adapter)
1354 // [outgoing Java arguments] <-- Z_esp
1355 // ...
1356 // PARENT [PARENT_IJAVA_FRAME_ABI]
1357 // ...
1358 //
1359
1360 address entry_point = __ pc();
1361
1362 // Make sure registers are different!
1363 assert_different_registers(Z_thread, Z_method, Z_esp);
1364
1365 BLOCK_COMMENT("native_entry {");
1366
1367 // Make sure method is native and not abstract.
1368 #ifdef ASSERT
1369 address reentry = NULL;
1370 { Label L;
1371 __ testbit(method_(access_flags), JVM_ACC_NATIVE_BIT);
1372 __ z_btrue(L);
1373 reentry = __ stop_chain_static(reentry, "tried to execute non-native method as native");
1374 __ bind(L);
1375 }
1376 { Label L;
1377 __ testbit(method_(access_flags), JVM_ACC_ABSTRACT_BIT);
1378 __ z_bfalse(L);
1379 reentry = __ stop_chain_static(reentry, "tried to execute abstract method as non-abstract");
1380 __ bind(L);
1381 }
1382 #endif // ASSERT
1383
1384 #ifdef ASSERT
1385 // Save the return PC into the callers frame for assertion in generate_fixed_frame.
1386 __ save_return_pc(Z_R14);
1387 #endif
1388
1389 // Generate the code to allocate the interpreter stack frame.
1390 generate_fixed_frame(true);
1391
1392 const Address do_not_unlock_if_synchronized(Z_thread, JavaThread::do_not_unlock_if_synchronized_offset());
1393 // Since at this point in the method invocation the exception handler
1394 // would try to exit the monitor of synchronized methods which hasn't
1395 // been entered yet, we set the thread local variable
1396 // _do_not_unlock_if_synchronized to true. If any exception was thrown by
1397 // runtime, exception handling i.e. unlock_if_synchronized_method will
1398 // check this thread local flag.
1399 __ z_mvi(do_not_unlock_if_synchronized, true);
1400
1401 // Increment invocation count and check for overflow.
1402 NearLabel invocation_counter_overflow;
1403 if (inc_counter) {
1404 generate_counter_incr(&invocation_counter_overflow, NULL, NULL);
1405 }
1406
1407 Label continue_after_compile;
1408 __ bind(continue_after_compile);
1409
1410 bang_stack_shadow_pages(true);
1411
1412 // Reset the _do_not_unlock_if_synchronized flag.
1413 __ z_mvi(do_not_unlock_if_synchronized, false);
1414
1415 // Check for synchronized methods.
1416 // This mst happen AFTER invocation_counter check and stack overflow check,
1417 // so method is not locked if overflows.
1418 if (synchronized) {
1419 lock_method();
1420 } else {
1421 // No synchronization necessary.
1422 #ifdef ASSERT
1423 { Label L;
1424 __ get_method(Z_R1_scratch);
1425 __ testbit(method2_(Z_R1_scratch, access_flags), JVM_ACC_SYNCHRONIZED_BIT);
1426 __ z_bfalse(L);
1427 reentry = __ stop_chain_static(reentry, "method needs synchronization");
1428 __ bind(L);
1429 }
1430 #endif // ASSERT
1431 }
1432
1433 // start execution
1434
1435 // jvmti support
1436 __ notify_method_entry();
1437
1438 //=============================================================================
1439 // Get and call the signature handler.
1440 const Register Rmethod = Z_tmp_2;
1441 const Register signature_handler_entry = Z_tmp_1;
1442 const Register Rresult_handler = Z_tmp_3;
1443 Label call_signature_handler;
1444
1445 assert_different_registers(Z_fp, Rmethod, signature_handler_entry, Rresult_handler);
1446 assert(Rresult_handler->is_nonvolatile(), "Rresult_handler must be in a non-volatile register");
1447
1448 // Reload method.
1449 __ get_method(Rmethod);
1450
1451 // Check for signature handler.
1452 __ load_and_test_long(signature_handler_entry, method2_(Rmethod, signature_handler));
1453 __ z_brne(call_signature_handler);
1454
1455 // Method has never been called. Either generate a specialized
1456 // handler or point to the slow one.
1457 __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::prepare_native_call),
1458 Rmethod);
1459
1460 // Reload method.
1461 __ get_method(Rmethod);
1462
1463 // Reload signature handler, it must have been created/assigned in the meantime.
1464 __ z_lg(signature_handler_entry, method2_(Rmethod, signature_handler));
1465
1466 __ bind(call_signature_handler);
1467
1468 // We have a TOP_IJAVA_FRAME here, which belongs to us.
1469 __ set_top_ijava_frame_at_SP_as_last_Java_frame(Z_SP, Z_R1/*tmp*/);
1470
1471 // Call signature handler and pass locals address in Z_ARG1.
1472 __ z_lgr(Z_ARG1, Z_locals);
1473 __ call_stub(signature_handler_entry);
1474 // Save result handler returned by signature handler.
1475 __ z_lgr(Rresult_handler, Z_RET);
1476
1477 // Reload method (the slow signature handler may block for GC).
1478 __ get_method(Rmethod);
1479
1480 // Pass mirror handle if static call.
1481 {
1482 Label method_is_not_static;
1483 __ testbit(method2_(Rmethod, access_flags), JVM_ACC_STATIC_BIT);
1484 __ z_bfalse(method_is_not_static);
1485 // Load mirror from interpreter frame.
1486 __ z_lg(Z_R1, _z_ijava_state_neg(mirror), Z_fp);
1487 // z_ijava_state.oop_temp = pool_holder->klass_part()->java_mirror();
1488 __ z_stg(Z_R1, oop_tmp_offset, Z_fp);
1489 // Pass handle to mirror as 2nd argument to JNI method.
1490 __ add2reg(Z_ARG2, oop_tmp_offset, Z_fp);
1491 __ bind(method_is_not_static);
1492 }
1493
1494 // Pass JNIEnv address as first parameter.
1495 __ add2reg(Z_ARG1, in_bytes(JavaThread::jni_environment_offset()), Z_thread);
1496
1497 // Note: last java frame has been set above already. The pc from there
1498 // is precise enough.
1499
1500 // Get native function entry point before we change the thread state.
1501 __ z_lg(Z_R1/*native_method_entry*/, method2_(Rmethod, native_function));
1502
1503 //=============================================================================
1504 // Transition from _thread_in_Java to _thread_in_native. As soon as
1505 // we make this change the safepoint code needs to be certain that
1506 // the last Java frame we established is good. The pc in that frame
1507 // just need to be near here not an actual return address.
1508 #ifdef ASSERT
1509 {
1510 NearLabel L;
1511 __ mem2reg_opt(Z_R14, Address(Z_thread, JavaThread::thread_state_offset()), false /*32 bits*/);
1512 __ compareU32_and_branch(Z_R14, _thread_in_Java, Assembler::bcondEqual, L);
1513 reentry = __ stop_chain_static(reentry, "Wrong thread state in native stub");
1514 __ bind(L);
1515 }
1516 #endif
1517
1518 // Memory ordering: Z does not reorder store/load with subsequent load. That's strong enough.
1519 __ set_thread_state(_thread_in_native);
1520
1521 //=============================================================================
1522 // Call the native method. Argument registers must not have been
1523 // overwritten since "__ call_stub(signature_handler);" (except for
1524 // ARG1 and ARG2 for static methods).
1525
1526 __ call_c(Z_R1/*native_method_entry*/);
1527
1528 // NOTE: frame::interpreter_frame_result() depends on these stores.
1529 __ z_stg(Z_RET, _z_ijava_state_neg(lresult), Z_fp);
1530 __ freg2mem_opt(Z_FRET, Address(Z_fp, _z_ijava_state_neg(fresult)));
1531 const Register Rlresult = signature_handler_entry;
1532 assert(Rlresult->is_nonvolatile(), "Rlresult must be in a non-volatile register");
1533 __ z_lgr(Rlresult, Z_RET);
1534
1535 // Z_method may no longer be valid, because of GC.
1536
1537 // Block, if necessary, before resuming in _thread_in_Java state.
1538 // In order for GC to work, don't clear the last_Java_sp until after
1539 // blocking.
1540
1541 //=============================================================================
1542 // Switch thread to "native transition" state before reading the
1543 // synchronization state. This additional state is necessary
1544 // because reading and testing the synchronization state is not
1545 // atomic w.r.t. GC, as this scenario demonstrates: Java thread A,
1546 // in _thread_in_native state, loads _not_synchronized and is
1547 // preempted. VM thread changes sync state to synchronizing and
1548 // suspends threads for GC. Thread A is resumed to finish this
1549 // native method, but doesn't block here since it didn't see any
1550 // synchronization is progress, and escapes.
1551
1552 __ set_thread_state(_thread_in_native_trans);
1553 __ z_fence();
1554
1555 // Now before we return to java we must look for a current safepoint
1556 // (a new safepoint can not start since we entered native_trans).
1557 // We must check here because a current safepoint could be modifying
1558 // the callers registers right this moment.
1559
1560 // Check for safepoint operation in progress and/or pending suspend requests.
1561 {
1562 Label Continue, do_safepoint;
1563 __ safepoint_poll(do_safepoint, Z_R1);
1564 // Check for suspend.
1565 __ load_and_test_int(Z_R0/*suspend_flags*/, thread_(suspend_flags));
1566 __ z_bre(Continue); // 0 -> no flag set -> not suspended
1567 __ bind(do_safepoint);
1568 __ z_lgr(Z_ARG1, Z_thread);
1569 __ call_c(CAST_FROM_FN_PTR(address, JavaThread::check_special_condition_for_native_trans));
1570 __ bind(Continue);
1571 }
1572
1573 //=============================================================================
1574 // Back in Interpreter Frame.
1575
1576 // We are in thread_in_native_trans here and back in the normal
1577 // interpreter frame. We don't have to do anything special about
1578 // safepoints and we can switch to Java mode anytime we are ready.
1579
1580 // Note: frame::interpreter_frame_result has a dependency on how the
1581 // method result is saved across the call to post_method_exit. For
1582 // native methods it assumes that the non-FPU/non-void result is
1583 // saved in z_ijava_state.lresult and a FPU result in z_ijava_state.fresult. If
1584 // this changes then the interpreter_frame_result implementation
1585 // will need to be updated too.
1586
1587 //=============================================================================
1588 // Back in Java.
1589
1590 // Memory ordering: Z does not reorder store/load with subsequent
1591 // load. That's strong enough.
1592 __ set_thread_state(_thread_in_Java);
1593
1594 __ reset_last_Java_frame();
1595
1596 // We reset the JNI handle block only after unboxing the result; see below.
1597
1598 // The method register is junk from after the thread_in_native transition
1599 // until here. Also can't call_VM until the bcp has been
1600 // restored. Need bcp for throwing exception below so get it now.
1601 __ get_method(Rmethod);
1602
1603 // Restore Z_bcp to have legal interpreter frame,
1604 // i.e., bci == 0 <=> Z_bcp == code_base().
1605 __ z_lg(Z_bcp, Address(Rmethod, Method::const_offset())); // get constMethod
1606 __ add2reg(Z_bcp, in_bytes(ConstMethod::codes_offset())); // get codebase
1607
1608 if (CheckJNICalls) {
1609 // clear_pending_jni_exception_check
1610 __ clear_mem(Address(Z_thread, JavaThread::pending_jni_exception_check_fn_offset()), sizeof(oop));
1611 }
1612
1613 // Check if the native method returns an oop, and if so, move it
1614 // from the jni handle to z_ijava_state.oop_temp. This is
1615 // necessary, because we reset the jni handle block below.
1616 // NOTE: frame::interpreter_frame_result() depends on this, too.
1617 { NearLabel no_oop_result;
1618 __ load_absolute_address(Z_R1, AbstractInterpreter::result_handler(T_OBJECT));
1619 __ compareU64_and_branch(Z_R1, Rresult_handler, Assembler::bcondNotEqual, no_oop_result);
1620 __ resolve_jobject(Rlresult, /* tmp1 */ Rmethod, /* tmp2 */ Z_R1);
1621 __ z_stg(Rlresult, oop_tmp_offset, Z_fp);
1622 __ bind(no_oop_result);
1623 }
1624
1625 // Reset handle block.
1626 __ z_lg(Z_R1/*active_handles*/, thread_(active_handles));
1627 __ clear_mem(Address(Z_R1, JNIHandleBlock::top_offset_in_bytes()), 4);
1628
1629 // Handle exceptions (exception handling will handle unlocking!).
1630 {
1631 Label L;
1632 __ load_and_test_long(Z_R0/*pending_exception*/, thread_(pending_exception));
1633 __ z_bre(L);
1634 __ MacroAssembler::call_VM(noreg,
1635 CAST_FROM_FN_PTR(address,
1636 InterpreterRuntime::throw_pending_exception));
1637 __ should_not_reach_here();
1638 __ bind(L);
1639 }
1640
1641 if (synchronized) {
1642 Register Rfirst_monitor = Z_ARG2;
1643 __ add2reg(Rfirst_monitor, -(frame::z_ijava_state_size + (int)sizeof(BasicObjectLock)), Z_fp);
1644 #ifdef ASSERT
1645 NearLabel ok;
1646 __ z_lg(Z_R1, _z_ijava_state_neg(monitors), Z_fp);
1647 __ compareU64_and_branch(Rfirst_monitor, Z_R1, Assembler::bcondEqual, ok);
1648 reentry = __ stop_chain_static(reentry, "native_entry:unlock: inconsistent z_ijava_state.monitors");
1649 __ bind(ok);
1650 #endif
1651 __ unlock_object(Rfirst_monitor);
1652 }
1653
1654 // JVMTI support. Result has already been saved above to the frame.
1655 __ notify_method_exit(true/*native_method*/, ilgl, InterpreterMacroAssembler::NotifyJVMTI);
1656
1657 // Move native method result back into proper registers and return.
1658 __ mem2freg_opt(Z_FRET, Address(Z_fp, _z_ijava_state_neg(fresult)));
1659 __ mem2reg_opt(Z_RET, Address(Z_fp, _z_ijava_state_neg(lresult)));
1660 __ call_stub(Rresult_handler);
1661
1662 // Pop the native method's interpreter frame.
1663 __ pop_interpreter_frame(Z_R14 /*return_pc*/, Z_ARG2/*tmp1*/, Z_ARG3/*tmp2*/);
1664
1665 // Return to caller.
1666 __ z_br(Z_R14);
1667
1668 if (inc_counter) {
1669 // Handle overflow of counter and compile method.
1670 __ bind(invocation_counter_overflow);
1671 generate_counter_overflow(continue_after_compile);
1672 }
1673
1674 BLOCK_COMMENT("} native_entry");
1675
1676 return entry_point;
1677 }
1678
1679 //
1680 // Generic interpreted method entry to template interpreter.
1681 //
generate_normal_entry(bool synchronized)1682 address TemplateInterpreterGenerator::generate_normal_entry(bool synchronized) {
1683 address entry_point = __ pc();
1684
1685 bool inc_counter = UseCompiler || CountCompiledCalls || LogTouchedMethods;
1686
1687 // Interpreter entry for ordinary Java methods.
1688 //
1689 // Registers alive
1690 // Z_SP - stack pointer
1691 // Z_thread - JavaThread*
1692 // Z_method - callee's method (method to be invoked)
1693 // Z_esp - operand (or expression) stack pointer of caller. one slot above last arg.
1694 // Z_R10 - sender sp (before modifications, e.g. by c2i adapter
1695 // and as well by generate_fixed_frame below)
1696 // Z_R14 - return address to caller (call_stub or c2i_adapter)
1697 //
1698 // Registers updated
1699 // Z_SP - stack pointer
1700 // Z_fp - callee's framepointer
1701 // Z_esp - callee's operand stack pointer
1702 // points to the slot above the value on top
1703 // Z_locals - used to access locals: locals[i] := *(Z_locals - i*BytesPerWord)
1704 // Z_tos - integer result, if any
1705 // z_ftos - floating point result, if any
1706 //
1707 //
1708 // stack layout at this point:
1709 //
1710 // F1 [TOP_IJAVA_FRAME_ABI] <-- Z_SP, Z_R10 (Z_R10 will be below Z_SP if
1711 // frame was extended by c2i adapter)
1712 // [outgoing Java arguments] <-- Z_esp
1713 // ...
1714 // PARENT [PARENT_IJAVA_FRAME_ABI]
1715 // ...
1716 //
1717 // stack layout before dispatching the first bytecode:
1718 //
1719 // F0 [TOP_IJAVA_FRAME_ABI] <-- Z_SP
1720 // [operand stack] <-- Z_esp
1721 // monitor (optional, can grow)
1722 // [IJAVA_STATE]
1723 // F1 [PARENT_IJAVA_FRAME_ABI] <-- Z_fp (== *Z_SP)
1724 // [F0's locals] <-- Z_locals
1725 // [F1's operand stack]
1726 // [F1's monitors] (optional)
1727 // [IJAVA_STATE]
1728
1729 // Make sure registers are different!
1730 assert_different_registers(Z_thread, Z_method, Z_esp);
1731
1732 BLOCK_COMMENT("normal_entry {");
1733
1734 // Make sure method is not native and not abstract.
1735 // Rethink these assertions - they can be simplified and shared.
1736 #ifdef ASSERT
1737 address reentry = NULL;
1738 { Label L;
1739 __ testbit(method_(access_flags), JVM_ACC_NATIVE_BIT);
1740 __ z_bfalse(L);
1741 reentry = __ stop_chain_static(reentry, "tried to execute native method as non-native");
1742 __ bind(L);
1743 }
1744 { Label L;
1745 __ testbit(method_(access_flags), JVM_ACC_ABSTRACT_BIT);
1746 __ z_bfalse(L);
1747 reentry = __ stop_chain_static(reentry, "tried to execute abstract method as non-abstract");
1748 __ bind(L);
1749 }
1750 #endif // ASSERT
1751
1752 #ifdef ASSERT
1753 // Save the return PC into the callers frame for assertion in generate_fixed_frame.
1754 __ save_return_pc(Z_R14);
1755 #endif
1756
1757 // Generate the code to allocate the interpreter stack frame.
1758 generate_fixed_frame(false);
1759
1760 const Address do_not_unlock_if_synchronized(Z_thread, JavaThread::do_not_unlock_if_synchronized_offset());
1761 // Since at this point in the method invocation the exception handler
1762 // would try to exit the monitor of synchronized methods which hasn't
1763 // been entered yet, we set the thread local variable
1764 // _do_not_unlock_if_synchronized to true. If any exception was thrown by
1765 // runtime, exception handling i.e. unlock_if_synchronized_method will
1766 // check this thread local flag.
1767 __ z_mvi(do_not_unlock_if_synchronized, true);
1768
1769 __ profile_parameters_type(Z_tmp_2, Z_ARG3, Z_ARG4);
1770
1771 // Increment invocation counter and check for overflow.
1772 //
1773 // Note: checking for negative value instead of overflow so we have a 'sticky'
1774 // overflow test (may be of importance as soon as we have true MT/MP).
1775 NearLabel invocation_counter_overflow;
1776 NearLabel profile_method;
1777 NearLabel profile_method_continue;
1778 NearLabel Lcontinue;
1779 if (inc_counter) {
1780 generate_counter_incr(&invocation_counter_overflow, &profile_method, &profile_method_continue);
1781 if (ProfileInterpreter) {
1782 __ bind(profile_method_continue);
1783 }
1784 }
1785 __ bind(Lcontinue);
1786
1787 bang_stack_shadow_pages(false);
1788
1789 // Reset the _do_not_unlock_if_synchronized flag.
1790 __ z_mvi(do_not_unlock_if_synchronized, false);
1791
1792 // Check for synchronized methods.
1793 // Must happen AFTER invocation_counter check and stack overflow check,
1794 // so method is not locked if overflows.
1795 if (synchronized) {
1796 // Allocate monitor and lock method.
1797 lock_method();
1798 } else {
1799 #ifdef ASSERT
1800 { Label L;
1801 __ get_method(Z_R1_scratch);
1802 __ testbit(method2_(Z_R1_scratch, access_flags), JVM_ACC_SYNCHRONIZED_BIT);
1803 __ z_bfalse(L);
1804 reentry = __ stop_chain_static(reentry, "method needs synchronization");
1805 __ bind(L);
1806 }
1807 #endif // ASSERT
1808 }
1809
1810 // start execution
1811
1812 #ifdef ASSERT
1813 __ verify_esp(Z_esp, Z_R1_scratch);
1814
1815 __ verify_thread();
1816 #endif
1817
1818 // jvmti support
1819 __ notify_method_entry();
1820
1821 // Start executing instructions.
1822 __ dispatch_next(vtos);
1823 // Dispatch_next does not return.
1824 DEBUG_ONLY(__ should_not_reach_here());
1825
1826 // Invocation counter overflow.
1827 if (inc_counter) {
1828 if (ProfileInterpreter) {
1829 // We have decided to profile this method in the interpreter.
1830 __ bind(profile_method);
1831
1832 __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::profile_method));
1833 __ set_method_data_pointer_for_bcp();
1834 __ z_bru(profile_method_continue);
1835 }
1836
1837 // Handle invocation counter overflow.
1838 __ bind(invocation_counter_overflow);
1839 generate_counter_overflow(Lcontinue);
1840 }
1841
1842 BLOCK_COMMENT("} normal_entry");
1843
1844 return entry_point;
1845 }
1846
1847
1848 /**
1849 * Method entry for static native methods:
1850 * int java.util.zip.CRC32.update(int crc, int b)
1851 */
generate_CRC32_update_entry()1852 address TemplateInterpreterGenerator::generate_CRC32_update_entry() {
1853
1854 if (UseCRC32Intrinsics) {
1855 uint64_t entry_off = __ offset();
1856 Label slow_path;
1857
1858 // If we need a safepoint check, generate full interpreter entry.
1859 __ safepoint_poll(slow_path, Z_R1);
1860
1861 BLOCK_COMMENT("CRC32_update {");
1862
1863 // We don't generate local frame and don't align stack because
1864 // we not even call stub code (we generate the code inline)
1865 // and there is no safepoint on this path.
1866
1867 // Load java parameters.
1868 // Z_esp is callers operand stack pointer, i.e. it points to the parameters.
1869 const Register argP = Z_esp;
1870 const Register crc = Z_ARG1; // crc value
1871 const Register data = Z_ARG2; // address of java byte value (kernel_crc32 needs address)
1872 const Register dataLen = Z_ARG3; // source data len (1 byte). Not used because calling the single-byte emitter.
1873 const Register table = Z_ARG4; // address of crc32 table
1874
1875 // Arguments are reversed on java expression stack.
1876 __ z_la(data, 3+1*wordSize, argP); // byte value (stack address).
1877 // Being passed as an int, the single byte is at offset +3.
1878 __ z_llgf(crc, 2 * wordSize, argP); // Current crc state, zero extend to 64 bit to have a clean register.
1879
1880 StubRoutines::zarch::generate_load_crc_table_addr(_masm, table);
1881 __ kernel_crc32_singleByte(crc, data, dataLen, table, Z_R1, true);
1882
1883 // Restore caller sp for c2i case.
1884 __ resize_frame_absolute(Z_R10, Z_R0, true); // Cut the stack back to where the caller started.
1885
1886 __ z_br(Z_R14);
1887
1888 BLOCK_COMMENT("} CRC32_update");
1889
1890 // Use a previously generated vanilla native entry as the slow path.
1891 BIND(slow_path);
1892 __ jump_to_entry(Interpreter::entry_for_kind(Interpreter::native), Z_R1);
1893 return __ addr_at(entry_off);
1894 }
1895
1896 return NULL;
1897 }
1898
1899
1900 /**
1901 * Method entry for static native methods:
1902 * int java.util.zip.CRC32.updateBytes( int crc, byte[] b, int off, int len)
1903 * int java.util.zip.CRC32.updateByteBuffer(int crc, long* buf, int off, int len)
1904 */
generate_CRC32_updateBytes_entry(AbstractInterpreter::MethodKind kind)1905 address TemplateInterpreterGenerator::generate_CRC32_updateBytes_entry(AbstractInterpreter::MethodKind kind) {
1906
1907 if (UseCRC32Intrinsics) {
1908 uint64_t entry_off = __ offset();
1909 Label slow_path;
1910
1911 // If we need a safepoint check, generate full interpreter entry.
1912 __ safepoint_poll(slow_path, Z_R1);
1913
1914 // We don't generate local frame and don't align stack because
1915 // we call stub code and there is no safepoint on this path.
1916
1917 // Load parameters.
1918 // Z_esp is callers operand stack pointer, i.e. it points to the parameters.
1919 const Register argP = Z_esp;
1920 const Register crc = Z_ARG1; // crc value
1921 const Register data = Z_ARG2; // address of java byte array
1922 const Register dataLen = Z_ARG3; // source data len
1923 const Register table = Z_ARG4; // address of crc32 table
1924 const Register t0 = Z_R10; // work reg for kernel* emitters
1925 const Register t1 = Z_R11; // work reg for kernel* emitters
1926 const Register t2 = Z_R12; // work reg for kernel* emitters
1927 const Register t3 = Z_R13; // work reg for kernel* emitters
1928
1929 // Arguments are reversed on java expression stack.
1930 // Calculate address of start element.
1931 if (kind == Interpreter::java_util_zip_CRC32_updateByteBuffer) { // Used for "updateByteBuffer direct".
1932 // crc @ (SP + 5W) (32bit)
1933 // buf @ (SP + 3W) (64bit ptr to long array)
1934 // off @ (SP + 2W) (32bit)
1935 // dataLen @ (SP + 1W) (32bit)
1936 // data = buf + off
1937 BLOCK_COMMENT("CRC32_updateByteBuffer {");
1938 __ z_llgf(crc, 5*wordSize, argP); // current crc state
1939 __ z_lg(data, 3*wordSize, argP); // start of byte buffer
1940 __ z_agf(data, 2*wordSize, argP); // Add byte buffer offset.
1941 __ z_lgf(dataLen, 1*wordSize, argP); // #bytes to process
1942 } else { // Used for "updateBytes update".
1943 // crc @ (SP + 4W) (32bit)
1944 // buf @ (SP + 3W) (64bit ptr to byte array)
1945 // off @ (SP + 2W) (32bit)
1946 // dataLen @ (SP + 1W) (32bit)
1947 // data = buf + off + base_offset
1948 BLOCK_COMMENT("CRC32_updateBytes {");
1949 __ z_llgf(crc, 4*wordSize, argP); // current crc state
1950 __ z_lg(data, 3*wordSize, argP); // start of byte buffer
1951 __ z_agf(data, 2*wordSize, argP); // Add byte buffer offset.
1952 __ z_lgf(dataLen, 1*wordSize, argP); // #bytes to process
1953 __ z_aghi(data, arrayOopDesc::base_offset_in_bytes(T_BYTE));
1954 }
1955
1956 StubRoutines::zarch::generate_load_crc_table_addr(_masm, table);
1957
1958 __ resize_frame(-(6*8), Z_R0, true); // Resize frame to provide add'l space to spill 5 registers.
1959 __ z_stmg(t0, t3, 1*8, Z_SP); // Spill regs 10..13 to make them available as work registers.
1960 __ kernel_crc32_1word(crc, data, dataLen, table, t0, t1, t2, t3, true);
1961 __ z_lmg(t0, t3, 1*8, Z_SP); // Spill regs 10..13 back from stack.
1962
1963 // Restore caller sp for c2i case.
1964 __ resize_frame_absolute(Z_R10, Z_R0, true); // Cut the stack back to where the caller started.
1965
1966 __ z_br(Z_R14);
1967
1968 BLOCK_COMMENT("} CRC32_update{Bytes|ByteBuffer}");
1969
1970 // Use a previously generated vanilla native entry as the slow path.
1971 BIND(slow_path);
1972 __ jump_to_entry(Interpreter::entry_for_kind(Interpreter::native), Z_R1);
1973 return __ addr_at(entry_off);
1974 }
1975
1976 return NULL;
1977 }
1978
1979
1980 /**
1981 * Method entry for intrinsic-candidate (non-native) methods:
1982 * int java.util.zip.CRC32C.updateBytes( int crc, byte[] b, int off, int end)
1983 * int java.util.zip.CRC32C.updateDirectByteBuffer(int crc, long* buf, int off, int end)
1984 * Unlike CRC32, CRC32C does not have any methods marked as native
1985 * CRC32C also uses an "end" variable instead of the length variable CRC32 uses
1986 */
generate_CRC32C_updateBytes_entry(AbstractInterpreter::MethodKind kind)1987 address TemplateInterpreterGenerator::generate_CRC32C_updateBytes_entry(AbstractInterpreter::MethodKind kind) {
1988
1989 if (UseCRC32CIntrinsics) {
1990 uint64_t entry_off = __ offset();
1991
1992 // We don't generate local frame and don't align stack because
1993 // we call stub code and there is no safepoint on this path.
1994
1995 // Load parameters.
1996 // Z_esp is callers operand stack pointer, i.e. it points to the parameters.
1997 const Register argP = Z_esp;
1998 const Register crc = Z_ARG1; // crc value
1999 const Register data = Z_ARG2; // address of java byte array
2000 const Register dataLen = Z_ARG3; // source data len
2001 const Register table = Z_ARG4; // address of crc32 table
2002 const Register t0 = Z_R10; // work reg for kernel* emitters
2003 const Register t1 = Z_R11; // work reg for kernel* emitters
2004 const Register t2 = Z_R12; // work reg for kernel* emitters
2005 const Register t3 = Z_R13; // work reg for kernel* emitters
2006
2007 // Arguments are reversed on java expression stack.
2008 // Calculate address of start element.
2009 if (kind == Interpreter::java_util_zip_CRC32C_updateDirectByteBuffer) { // Used for "updateByteBuffer direct".
2010 // crc @ (SP + 5W) (32bit)
2011 // buf @ (SP + 3W) (64bit ptr to long array)
2012 // off @ (SP + 2W) (32bit)
2013 // dataLen @ (SP + 1W) (32bit)
2014 // data = buf + off
2015 BLOCK_COMMENT("CRC32C_updateDirectByteBuffer {");
2016 __ z_llgf(crc, 5*wordSize, argP); // current crc state
2017 __ z_lg(data, 3*wordSize, argP); // start of byte buffer
2018 __ z_agf(data, 2*wordSize, argP); // Add byte buffer offset.
2019 __ z_lgf(dataLen, 1*wordSize, argP); // #bytes to process, calculated as
2020 __ z_sgf(dataLen, Address(argP, 2*wordSize)); // (end_index - offset)
2021 } else { // Used for "updateBytes update".
2022 // crc @ (SP + 4W) (32bit)
2023 // buf @ (SP + 3W) (64bit ptr to byte array)
2024 // off @ (SP + 2W) (32bit)
2025 // dataLen @ (SP + 1W) (32bit)
2026 // data = buf + off + base_offset
2027 BLOCK_COMMENT("CRC32C_updateBytes {");
2028 __ z_llgf(crc, 4*wordSize, argP); // current crc state
2029 __ z_lg(data, 3*wordSize, argP); // start of byte buffer
2030 __ z_agf(data, 2*wordSize, argP); // Add byte buffer offset.
2031 __ z_lgf(dataLen, 1*wordSize, argP); // #bytes to process, calculated as
2032 __ z_sgf(dataLen, Address(argP, 2*wordSize)); // (end_index - offset)
2033 __ z_aghi(data, arrayOopDesc::base_offset_in_bytes(T_BYTE));
2034 }
2035
2036 StubRoutines::zarch::generate_load_crc32c_table_addr(_masm, table);
2037
2038 __ resize_frame(-(6*8), Z_R0, true); // Resize frame to provide add'l space to spill 5 registers.
2039 __ z_stmg(t0, t3, 1*8, Z_SP); // Spill regs 10..13 to make them available as work registers.
2040 __ kernel_crc32_1word(crc, data, dataLen, table, t0, t1, t2, t3, false);
2041 __ z_lmg(t0, t3, 1*8, Z_SP); // Spill regs 10..13 back from stack.
2042
2043 // Restore caller sp for c2i case.
2044 __ resize_frame_absolute(Z_R10, Z_R0, true); // Cut the stack back to where the caller started.
2045
2046 __ z_br(Z_R14);
2047
2048 BLOCK_COMMENT("} CRC32C_update{Bytes|DirectByteBuffer}");
2049 return __ addr_at(entry_off);
2050 }
2051
2052 return NULL;
2053 }
2054
bang_stack_shadow_pages(bool native_call)2055 void TemplateInterpreterGenerator::bang_stack_shadow_pages(bool native_call) {
2056 // Quick & dirty stack overflow checking: bang the stack & handle trap.
2057 // Note that we do the banging after the frame is setup, since the exception
2058 // handling code expects to find a valid interpreter frame on the stack.
2059 // Doing the banging earlier fails if the caller frame is not an interpreter
2060 // frame.
2061 // (Also, the exception throwing code expects to unlock any synchronized
2062 // method receiver, so do the banging after locking the receiver.)
2063
2064 // Bang each page in the shadow zone. We can't assume it's been done for
2065 // an interpreter frame with greater than a page of locals, so each page
2066 // needs to be checked. Only true for non-native. For native, we only bang the last page.
2067 if (UseStackBanging) {
2068 const int page_size = os::vm_page_size();
2069 const int n_shadow_pages = (int)(JavaThread::stack_shadow_zone_size()/page_size);
2070 const int start_page_num = native_call ? n_shadow_pages : 1;
2071 for (int pages = start_page_num; pages <= n_shadow_pages; pages++) {
2072 __ bang_stack_with_offset(pages*page_size);
2073 }
2074 }
2075 }
2076
2077 //-----------------------------------------------------------------------------
2078 // Exceptions
2079
generate_throw_exception()2080 void TemplateInterpreterGenerator::generate_throw_exception() {
2081
2082 BLOCK_COMMENT("throw_exception {");
2083
2084 // Entry point in previous activation (i.e., if the caller was interpreted).
2085 Interpreter::_rethrow_exception_entry = __ pc();
2086 __ z_lg(Z_fp, _z_abi(callers_sp), Z_SP); // Frame accessors use Z_fp.
2087 // Z_ARG1 (==Z_tos): exception
2088 // Z_ARG2 : Return address/pc that threw exception.
2089 __ restore_bcp(); // R13 points to call/send.
2090 __ restore_locals();
2091
2092 // Fallthrough, no need to restore Z_esp.
2093
2094 // Entry point for exceptions thrown within interpreter code.
2095 Interpreter::_throw_exception_entry = __ pc();
2096 // Expression stack is undefined here.
2097 // Z_ARG1 (==Z_tos): exception
2098 // Z_bcp: exception bcp
2099 __ verify_oop(Z_ARG1);
2100 __ z_lgr(Z_ARG2, Z_ARG1);
2101
2102 // Expression stack must be empty before entering the VM in case of
2103 // an exception.
2104 __ empty_expression_stack();
2105 // Find exception handler address and preserve exception oop.
2106 const Register Rpreserved_exc_oop = Z_tmp_1;
2107 __ call_VM(Rpreserved_exc_oop,
2108 CAST_FROM_FN_PTR(address, InterpreterRuntime::exception_handler_for_exception),
2109 Z_ARG2);
2110 // Z_RET: exception handler entry point
2111 // Z_bcp: bcp for exception handler
2112 __ push_ptr(Rpreserved_exc_oop); // Push exception which is now the only value on the stack.
2113 __ z_br(Z_RET); // Jump to exception handler (may be _remove_activation_entry!).
2114
2115 // If the exception is not handled in the current frame the frame is
2116 // removed and the exception is rethrown (i.e. exception
2117 // continuation is _rethrow_exception).
2118 //
2119 // Note: At this point the bci is still the bci for the instruction
2120 // which caused the exception and the expression stack is
2121 // empty. Thus, for any VM calls at this point, GC will find a legal
2122 // oop map (with empty expression stack).
2123
2124 //
2125 // JVMTI PopFrame support
2126 //
2127
2128 Interpreter::_remove_activation_preserving_args_entry = __ pc();
2129 __ z_lg(Z_fp, _z_parent_ijava_frame_abi(callers_sp), Z_SP);
2130 __ empty_expression_stack();
2131 // Set the popframe_processing bit in pending_popframe_condition
2132 // indicating that we are currently handling popframe, so that
2133 // call_VMs that may happen later do not trigger new popframe
2134 // handling cycles.
2135 __ load_sized_value(Z_tmp_1, Address(Z_thread, JavaThread::popframe_condition_offset()), 4, false /*signed*/);
2136 __ z_oill(Z_tmp_1, JavaThread::popframe_processing_bit);
2137 __ z_sty(Z_tmp_1, thread_(popframe_condition));
2138
2139 {
2140 // Check to see whether we are returning to a deoptimized frame.
2141 // (The PopFrame call ensures that the caller of the popped frame is
2142 // either interpreted or compiled and deoptimizes it if compiled.)
2143 // In this case, we can't call dispatch_next() after the frame is
2144 // popped, but instead must save the incoming arguments and restore
2145 // them after deoptimization has occurred.
2146 //
2147 // Note that we don't compare the return PC against the
2148 // deoptimization blob's unpack entry because of the presence of
2149 // adapter frames in C2.
2150 NearLabel caller_not_deoptimized;
2151 __ z_lg(Z_ARG1, _z_parent_ijava_frame_abi(return_pc), Z_fp);
2152 __ call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::interpreter_contains), Z_ARG1);
2153 __ compareU64_and_branch(Z_RET, (intptr_t)0, Assembler::bcondNotEqual, caller_not_deoptimized);
2154
2155 // Compute size of arguments for saving when returning to
2156 // deoptimized caller.
2157 __ get_method(Z_ARG2);
2158 __ z_lg(Z_ARG2, Address(Z_ARG2, Method::const_offset()));
2159 __ z_llgh(Z_ARG2, Address(Z_ARG2, ConstMethod::size_of_parameters_offset()));
2160 __ z_sllg(Z_ARG2, Z_ARG2, Interpreter::logStackElementSize); // slots 2 bytes
2161 __ restore_locals();
2162 // Compute address of args to be saved.
2163 __ z_lgr(Z_ARG3, Z_locals);
2164 __ z_slgr(Z_ARG3, Z_ARG2);
2165 __ add2reg(Z_ARG3, wordSize);
2166 // Save these arguments.
2167 __ call_VM_leaf(CAST_FROM_FN_PTR(address, Deoptimization::popframe_preserve_args),
2168 Z_thread, Z_ARG2, Z_ARG3);
2169
2170 __ remove_activation(vtos, Z_R14,
2171 /* throw_monitor_exception */ false,
2172 /* install_monitor_exception */ false,
2173 /* notify_jvmdi */ false);
2174
2175 // Inform deoptimization that it is responsible for restoring
2176 // these arguments.
2177 __ store_const(thread_(popframe_condition),
2178 JavaThread::popframe_force_deopt_reexecution_bit,
2179 Z_tmp_1, false);
2180
2181 // Continue in deoptimization handler.
2182 __ z_br(Z_R14);
2183
2184 __ bind(caller_not_deoptimized);
2185 }
2186
2187 // Clear the popframe condition flag.
2188 __ clear_mem(thread_(popframe_condition), sizeof(int));
2189
2190 __ remove_activation(vtos,
2191 noreg, // Retaddr is not used.
2192 false, // throw_monitor_exception
2193 false, // install_monitor_exception
2194 false); // notify_jvmdi
2195 __ z_lg(Z_fp, _z_abi(callers_sp), Z_SP); // Restore frame pointer.
2196 __ restore_bcp();
2197 __ restore_locals();
2198 __ restore_esp();
2199 // The method data pointer was incremented already during
2200 // call profiling. We have to restore the mdp for the current bcp.
2201 if (ProfileInterpreter) {
2202 __ set_method_data_pointer_for_bcp();
2203 }
2204 #if INCLUDE_JVMTI
2205 {
2206 Label L_done;
2207
2208 __ z_cli(0, Z_bcp, Bytecodes::_invokestatic);
2209 __ z_brc(Assembler::bcondNotEqual, L_done);
2210
2211 // The member name argument must be restored if _invokestatic is
2212 // re-executed after a PopFrame call. Detect such a case in the
2213 // InterpreterRuntime function and return the member name
2214 // argument, or NULL.
2215 __ z_lg(Z_ARG2, Address(Z_locals));
2216 __ get_method(Z_ARG3);
2217 __ call_VM(Z_tmp_1,
2218 CAST_FROM_FN_PTR(address, InterpreterRuntime::member_name_arg_or_null),
2219 Z_ARG2, Z_ARG3, Z_bcp);
2220
2221 __ z_ltgr(Z_tmp_1, Z_tmp_1);
2222 __ z_brc(Assembler::bcondEqual, L_done);
2223
2224 __ z_stg(Z_tmp_1, Address(Z_esp, wordSize));
2225 __ bind(L_done);
2226 }
2227 #endif // INCLUDE_JVMTI
2228 __ dispatch_next(vtos);
2229 // End of PopFrame support.
2230 Interpreter::_remove_activation_entry = __ pc();
2231
2232 // In between activations - previous activation type unknown yet
2233 // compute continuation point - the continuation point expects the
2234 // following registers set up:
2235 //
2236 // Z_ARG1 (==Z_tos): exception
2237 // Z_ARG2 : return address/pc that threw exception
2238
2239 Register return_pc = Z_tmp_1;
2240 Register handler = Z_tmp_2;
2241 assert(return_pc->is_nonvolatile(), "use non-volatile reg. to preserve exception pc");
2242 assert(handler->is_nonvolatile(), "use non-volatile reg. to handler pc");
2243 __ asm_assert_ijava_state_magic(return_pc/*tmp*/); // The top frame should be an interpreter frame.
2244 __ z_lg(return_pc, _z_parent_ijava_frame_abi(return_pc), Z_fp);
2245
2246 // Moved removing the activation after VM call, because the new top
2247 // frame does not necessarily have the z_abi_160 required for a VM
2248 // call (e.g. if it is compiled).
2249
2250 __ super_call_VM_leaf(CAST_FROM_FN_PTR(address,
2251 SharedRuntime::exception_handler_for_return_address),
2252 Z_thread, return_pc);
2253 __ z_lgr(handler, Z_RET); // Save exception handler.
2254
2255 // Preserve exception over this code sequence.
2256 __ pop_ptr(Z_ARG1);
2257 __ set_vm_result(Z_ARG1);
2258 // Remove the activation (without doing throws on illegalMonitorExceptions).
2259 __ remove_activation(vtos, noreg/*ret.pc already loaded*/, false/*throw exc*/, true/*install exc*/, false/*notify jvmti*/);
2260 __ z_lg(Z_fp, _z_abi(callers_sp), Z_SP); // Restore frame pointer.
2261
2262 __ get_vm_result(Z_ARG1); // Restore exception.
2263 __ verify_oop(Z_ARG1);
2264 __ z_lgr(Z_ARG2, return_pc); // Restore return address.
2265
2266 #ifdef ASSERT
2267 // The return_pc in the new top frame is dead... at least that's my
2268 // current understanding. To assert this I overwrite it.
2269 // Note: for compiled frames the handler is the deopt blob
2270 // which writes Z_ARG2 into the return_pc slot.
2271 __ load_const_optimized(return_pc, 0xb00b1);
2272 __ z_stg(return_pc, _z_parent_ijava_frame_abi(return_pc), Z_SP);
2273 #endif
2274
2275 // Z_ARG1 (==Z_tos): exception
2276 // Z_ARG2 : return address/pc that threw exception
2277
2278 // Note that an "issuing PC" is actually the next PC after the call.
2279 __ z_br(handler); // Jump to exception handler of caller.
2280
2281 BLOCK_COMMENT("} throw_exception");
2282 }
2283
2284 //
2285 // JVMTI ForceEarlyReturn support
2286 //
generate_earlyret_entry_for(TosState state)2287 address TemplateInterpreterGenerator::generate_earlyret_entry_for (TosState state) {
2288 address entry = __ pc();
2289
2290 BLOCK_COMMENT("earlyret_entry {");
2291
2292 __ z_lg(Z_fp, _z_parent_ijava_frame_abi(callers_sp), Z_SP);
2293 __ restore_bcp();
2294 __ restore_locals();
2295 __ restore_esp();
2296 __ empty_expression_stack();
2297 __ load_earlyret_value(state);
2298
2299 Register RjvmtiState = Z_tmp_1;
2300 __ z_lg(RjvmtiState, thread_(jvmti_thread_state));
2301 __ store_const(Address(RjvmtiState, JvmtiThreadState::earlyret_state_offset()),
2302 JvmtiThreadState::earlyret_inactive, 4, 4, Z_R0_scratch);
2303
2304 if (state == itos) {
2305 // Narrow result if state is itos but result type is smaller.
2306 // Need to narrow in the return bytecode rather than in generate_return_entry
2307 // since compiled code callers expect the result to already be narrowed.
2308 __ narrow(Z_tos, Z_tmp_1); /* fall through */
2309 }
2310 __ remove_activation(state,
2311 Z_tmp_1, // retaddr
2312 false, // throw_monitor_exception
2313 false, // install_monitor_exception
2314 true); // notify_jvmdi
2315 __ z_br(Z_tmp_1);
2316
2317 BLOCK_COMMENT("} earlyret_entry");
2318
2319 return entry;
2320 }
2321
2322 //-----------------------------------------------------------------------------
2323 // Helper for vtos entry point generation.
2324
set_vtos_entry_points(Template * t,address & bep,address & cep,address & sep,address & aep,address & iep,address & lep,address & fep,address & dep,address & vep)2325 void TemplateInterpreterGenerator::set_vtos_entry_points(Template* t,
2326 address& bep,
2327 address& cep,
2328 address& sep,
2329 address& aep,
2330 address& iep,
2331 address& lep,
2332 address& fep,
2333 address& dep,
2334 address& vep) {
2335 assert(t->is_valid() && t->tos_in() == vtos, "illegal template");
2336 Label L;
2337 aep = __ pc(); __ push_ptr(); __ z_bru(L);
2338 fep = __ pc(); __ push_f(); __ z_bru(L);
2339 dep = __ pc(); __ push_d(); __ z_bru(L);
2340 lep = __ pc(); __ push_l(); __ z_bru(L);
2341 bep = cep = sep =
2342 iep = __ pc(); __ push_i();
2343 vep = __ pc();
2344 __ bind(L);
2345 generate_and_dispatch(t);
2346 }
2347
2348 //-----------------------------------------------------------------------------
2349
2350 #ifndef PRODUCT
generate_trace_code(TosState state)2351 address TemplateInterpreterGenerator::generate_trace_code(TosState state) {
2352 address entry = __ pc();
2353 NearLabel counter_below_trace_threshold;
2354
2355 if (TraceBytecodesAt > 0) {
2356 // Skip runtime call, if the trace threshold is not yet reached.
2357 __ load_absolute_address(Z_tmp_1, (address)&BytecodeCounter::_counter_value);
2358 __ load_absolute_address(Z_tmp_2, (address)&TraceBytecodesAt);
2359 __ load_sized_value(Z_tmp_1, Address(Z_tmp_1), 4, false /*signed*/);
2360 __ load_sized_value(Z_tmp_2, Address(Z_tmp_2), 8, false /*signed*/);
2361 __ compareU64_and_branch(Z_tmp_1, Z_tmp_2, Assembler::bcondLow, counter_below_trace_threshold);
2362 }
2363
2364 int offset2 = state == ltos || state == dtos ? 2 : 1;
2365
2366 __ push(state);
2367 // Preserved return pointer is in Z_R14.
2368 // InterpreterRuntime::trace_bytecode() preserved and returns the value passed as second argument.
2369 __ z_lgr(Z_ARG2, Z_R14);
2370 __ z_lg(Z_ARG3, Address(Z_esp, Interpreter::expr_offset_in_bytes(0)));
2371 if (WizardMode) {
2372 __ z_lgr(Z_ARG4, Z_esp); // Trace Z_esp in WizardMode.
2373 } else {
2374 __ z_lg(Z_ARG4, Address(Z_esp, Interpreter::expr_offset_in_bytes(offset2)));
2375 }
2376 __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::trace_bytecode), Z_ARG2, Z_ARG3, Z_ARG4);
2377 __ z_lgr(Z_R14, Z_RET); // Estore return address (see above).
2378 __ pop(state);
2379
2380 __ bind(counter_below_trace_threshold);
2381 __ z_br(Z_R14); // return
2382
2383 return entry;
2384 }
2385
2386 // Make feasible for old CPUs.
count_bytecode()2387 void TemplateInterpreterGenerator::count_bytecode() {
2388 __ load_absolute_address(Z_R1_scratch, (address) &BytecodeCounter::_counter_value);
2389 __ add2mem_32(Address(Z_R1_scratch), 1, Z_R0_scratch);
2390 }
2391
histogram_bytecode(Template * t)2392 void TemplateInterpreterGenerator::histogram_bytecode(Template * t) {
2393 __ load_absolute_address(Z_R1_scratch, (address)&BytecodeHistogram::_counters[ t->bytecode() ]);
2394 __ add2mem_32(Address(Z_R1_scratch), 1, Z_tmp_1);
2395 }
2396
histogram_bytecode_pair(Template * t)2397 void TemplateInterpreterGenerator::histogram_bytecode_pair(Template * t) {
2398 Address index_addr(Z_tmp_1, (intptr_t) 0);
2399 Register index = Z_tmp_2;
2400
2401 // Load previous index.
2402 __ load_absolute_address(Z_tmp_1, (address) &BytecodePairHistogram::_index);
2403 __ mem2reg_opt(index, index_addr, false);
2404
2405 // Mask with current bytecode and store as new previous index.
2406 __ z_srl(index, BytecodePairHistogram::log2_number_of_codes);
2407 __ load_const_optimized(Z_R0_scratch,
2408 (int)t->bytecode() << BytecodePairHistogram::log2_number_of_codes);
2409 __ z_or(index, Z_R0_scratch);
2410 __ reg2mem_opt(index, index_addr, false);
2411
2412 // Load counter array's address.
2413 __ z_lgfr(index, index); // Sign extend for addressing.
2414 __ z_sllg(index, index, LogBytesPerInt); // index2bytes
2415 __ load_absolute_address(Z_R1_scratch,
2416 (address) &BytecodePairHistogram::_counters);
2417 // Add index and increment counter.
2418 __ z_agr(Z_R1_scratch, index);
2419 __ add2mem_32(Address(Z_R1_scratch), 1, Z_tmp_1);
2420 }
2421
trace_bytecode(Template * t)2422 void TemplateInterpreterGenerator::trace_bytecode(Template* t) {
2423 // Call a little run-time stub to avoid blow-up for each bytecode.
2424 // The run-time runtime saves the right registers, depending on
2425 // the tosca in-state for the given template.
2426 address entry = Interpreter::trace_code(t->tos_in());
2427 guarantee(entry != NULL, "entry must have been generated");
2428 __ call_stub(entry);
2429 }
2430
stop_interpreter_at()2431 void TemplateInterpreterGenerator::stop_interpreter_at() {
2432 NearLabel L;
2433
2434 __ load_absolute_address(Z_tmp_1, (address)&BytecodeCounter::_counter_value);
2435 __ load_absolute_address(Z_tmp_2, (address)&StopInterpreterAt);
2436 __ load_sized_value(Z_tmp_1, Address(Z_tmp_1), 4, false /*signed*/);
2437 __ load_sized_value(Z_tmp_2, Address(Z_tmp_2), 8, false /*signed*/);
2438 __ compareU64_and_branch(Z_tmp_1, Z_tmp_2, Assembler::bcondLow, L);
2439 assert(Z_tmp_1->is_nonvolatile(), "must be nonvolatile to preserve Z_tos");
2440 assert(Z_F8->is_nonvolatile(), "must be nonvolatile to preserve Z_ftos");
2441 __ z_lgr(Z_tmp_1, Z_tos); // Save tos.
2442 __ z_lgr(Z_tmp_2, Z_bytecode); // Save Z_bytecode.
2443 __ z_ldr(Z_F8, Z_ftos); // Save ftos.
2444 // Use -XX:StopInterpreterAt=<num> to set the limit
2445 // and break at breakpoint().
2446 __ call_VM(noreg, CAST_FROM_FN_PTR(address, breakpoint), false);
2447 __ z_lgr(Z_tos, Z_tmp_1); // Restore tos.
2448 __ z_lgr(Z_bytecode, Z_tmp_2); // Save Z_bytecode.
2449 __ z_ldr(Z_ftos, Z_F8); // Restore ftos.
2450 __ bind(L);
2451 }
2452
2453 #endif // !PRODUCT
2454