1 /*
2 * Copyright (c) 2016, 2019, 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 guarantee(referent_offset > 0, "referent offset not initialized");
507
508 BLOCK_COMMENT("Reference_get {");
509
510 // If the receiver is null then it is OK to jump to the slow path.
511 __ load_and_test_long(pre_val, Address(Rargp, Interpreter::stackElementSize)); // Get receiver.
512 __ z_bre(slow_path);
513
514 // Load the value of the referent field.
515 __ load_heap_oop(pre_val, Address(pre_val, referent_offset), scratch1, scratch2, ON_WEAK_OOP_REF);
516
517 // Restore caller sp for c2i case.
518 __ resize_frame_absolute(Z_R10, Z_R0, true); // Cut the stack back to where the caller started.
519 __ z_br(Z_R14);
520
521 // Branch to previously generated regular method entry.
522 __ bind(slow_path);
523
524 address meth_entry = Interpreter::entry_for_kind(Interpreter::zerolocals);
525 __ jump_to_entry(meth_entry, Z_R1);
526
527 BLOCK_COMMENT("} Reference_get");
528
529 return entry;
530 }
531
generate_StackOverflowError_handler()532 address TemplateInterpreterGenerator::generate_StackOverflowError_handler() {
533 address entry = __ pc();
534
535 DEBUG_ONLY(__ verify_esp(Z_esp, Z_ARG5));
536
537 // Restore bcp under the assumption that the current frame is still
538 // interpreted.
539 __ restore_bcp();
540
541 // Expression stack must be empty before entering the VM if an
542 // exception happened.
543 __ empty_expression_stack();
544 // Throw exception.
545 __ call_VM(noreg,
546 CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_StackOverflowError));
547 return entry;
548 }
549
550 //
551 // Args:
552 // Z_ARG2: oop of array
553 // Z_ARG3: aberrant index
554 //
generate_ArrayIndexOutOfBounds_handler()555 address TemplateInterpreterGenerator::generate_ArrayIndexOutOfBounds_handler() {
556 address entry = __ pc();
557 address excp = CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_ArrayIndexOutOfBoundsException);
558
559 // Expression stack must be empty before entering the VM if an
560 // exception happened.
561 __ empty_expression_stack();
562
563 // Setup parameters.
564 // Pass register with array to create more detailed exceptions.
565 __ call_VM(noreg, excp, Z_ARG2, Z_ARG3);
566 return entry;
567 }
568
generate_ClassCastException_handler()569 address TemplateInterpreterGenerator::generate_ClassCastException_handler() {
570 address entry = __ pc();
571
572 // Object is at TOS.
573 __ pop_ptr(Z_ARG2);
574
575 // Expression stack must be empty before entering the VM if an
576 // exception happened.
577 __ empty_expression_stack();
578
579 __ call_VM(Z_ARG1,
580 CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_ClassCastException),
581 Z_ARG2);
582
583 DEBUG_ONLY(__ should_not_reach_here();)
584
585 return entry;
586 }
587
generate_exception_handler_common(const char * name,const char * message,bool pass_oop)588 address TemplateInterpreterGenerator::generate_exception_handler_common(const char* name, const char* message, bool pass_oop) {
589 assert(!pass_oop || message == NULL, "either oop or message but not both");
590 address entry = __ pc();
591
592 BLOCK_COMMENT("exception_handler_common {");
593
594 // Expression stack must be empty before entering the VM if an
595 // exception happened.
596 __ empty_expression_stack();
597 if (name != NULL) {
598 __ load_absolute_address(Z_ARG2, (address)name);
599 } else {
600 __ clear_reg(Z_ARG2, true, false);
601 }
602
603 if (pass_oop) {
604 __ call_VM(Z_tos,
605 CAST_FROM_FN_PTR(address, InterpreterRuntime::create_klass_exception),
606 Z_ARG2, Z_tos /*object (see TT::aastore())*/);
607 } else {
608 if (message != NULL) {
609 __ load_absolute_address(Z_ARG3, (address)message);
610 } else {
611 __ clear_reg(Z_ARG3, true, false);
612 }
613 __ call_VM(Z_tos,
614 CAST_FROM_FN_PTR(address, InterpreterRuntime::create_exception),
615 Z_ARG2, Z_ARG3);
616 }
617 // Throw exception.
618 __ load_absolute_address(Z_R1_scratch, Interpreter::throw_exception_entry());
619 __ z_br(Z_R1_scratch);
620
621 BLOCK_COMMENT("} exception_handler_common");
622
623 return entry;
624 }
625
generate_return_entry_for(TosState state,int step,size_t index_size)626 address TemplateInterpreterGenerator::generate_return_entry_for (TosState state, int step, size_t index_size) {
627 address entry = __ pc();
628
629 BLOCK_COMMENT("return_entry {");
630
631 // Pop i2c extension or revert top-2-parent-resize done by interpreted callees.
632 Register sp_before_i2c_extension = Z_bcp;
633 __ z_lg(Z_fp, _z_abi(callers_sp), Z_SP); // Restore frame pointer.
634 __ z_lg(sp_before_i2c_extension, Address(Z_fp, _z_ijava_state_neg(top_frame_sp)));
635 __ resize_frame_absolute(sp_before_i2c_extension, Z_locals/*tmp*/, true/*load_fp*/);
636
637 // TODO(ZASM): necessary??
638 // // and NULL it as marker that esp is now tos until next java call
639 // __ movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), (int32_t)NULL_WORD);
640
641 __ restore_bcp();
642 __ restore_locals();
643 __ restore_esp();
644
645 if (state == atos) {
646 __ profile_return_type(Z_tmp_1, Z_tos, Z_tmp_2);
647 }
648
649 Register cache = Z_tmp_1;
650 Register size = Z_tmp_1;
651 Register offset = Z_tmp_2;
652 const int flags_offset = in_bytes(ConstantPoolCache::base_offset() +
653 ConstantPoolCacheEntry::flags_offset());
654 __ get_cache_and_index_at_bcp(cache, offset, 1, index_size);
655
656 // #args is in rightmost byte of the _flags field.
657 __ z_llgc(size, Address(cache, offset, flags_offset+(sizeof(size_t)-1)));
658 __ z_sllg(size, size, Interpreter::logStackElementSize); // Each argument size in bytes.
659 __ z_agr(Z_esp, size); // Pop arguments.
660
661 __ check_and_handle_popframe(Z_thread);
662 __ check_and_handle_earlyret(Z_thread);
663
664 __ dispatch_next(state, step);
665
666 BLOCK_COMMENT("} return_entry");
667
668 return entry;
669 }
670
generate_deopt_entry_for(TosState state,int step,address continuation)671 address TemplateInterpreterGenerator::generate_deopt_entry_for(TosState state,
672 int step,
673 address continuation) {
674 address entry = __ pc();
675
676 BLOCK_COMMENT("deopt_entry {");
677
678 // TODO(ZASM): necessary? NULL last_sp until next java call
679 // __ movptr(Address(rbp, frame::interpreter_frame_last_sp_offset * wordSize), (int32_t)NULL_WORD);
680 __ z_lg(Z_fp, _z_abi(callers_sp), Z_SP); // Restore frame pointer.
681 __ restore_bcp();
682 __ restore_locals();
683 __ restore_esp();
684
685 // Handle exceptions.
686 {
687 Label L;
688 __ load_and_test_long(Z_R0/*pending_exception*/, thread_(pending_exception));
689 __ z_bre(L);
690 __ call_VM(noreg,
691 CAST_FROM_FN_PTR(address,
692 InterpreterRuntime::throw_pending_exception));
693 __ should_not_reach_here();
694 __ bind(L);
695 }
696 if (continuation == NULL) {
697 __ dispatch_next(state, step);
698 } else {
699 __ jump_to_entry(continuation, Z_R1_scratch);
700 }
701
702 BLOCK_COMMENT("} deopt_entry");
703
704 return entry;
705 }
706
generate_safept_entry_for(TosState state,address runtime_entry)707 address TemplateInterpreterGenerator::generate_safept_entry_for (TosState state,
708 address runtime_entry) {
709 address entry = __ pc();
710 __ push(state);
711 __ call_VM(noreg, runtime_entry);
712 __ dispatch_via(vtos, Interpreter::_normal_table.table_for (vtos));
713 return entry;
714 }
715
716 //
717 // Helpers for commoning out cases in the various type of method entries.
718 //
719
720 // Increment invocation count & check for overflow.
721 //
722 // Note: checking for negative value instead of overflow
723 // so we have a 'sticky' overflow test.
724 //
725 // Z_ARG2: method (see generate_fixed_frame())
726 //
generate_counter_incr(Label * overflow,Label * profile_method,Label * profile_method_continue)727 void TemplateInterpreterGenerator::generate_counter_incr(Label* overflow, Label* profile_method, Label* profile_method_continue) {
728 Label done;
729 Register method = Z_ARG2; // Generate_fixed_frame() copies Z_method into Z_ARG2.
730 Register m_counters = Z_ARG4;
731
732 BLOCK_COMMENT("counter_incr {");
733
734 // Note: In tiered we increment either counters in method or in MDO depending
735 // if we are profiling or not.
736 if (TieredCompilation) {
737 int increment = InvocationCounter::count_increment;
738 if (ProfileInterpreter) {
739 NearLabel no_mdo;
740 Register mdo = m_counters;
741 // Are we profiling?
742 __ load_and_test_long(mdo, method2_(method, method_data));
743 __ branch_optimized(Assembler::bcondZero, no_mdo);
744 // Increment counter in the MDO.
745 const Address mdo_invocation_counter(mdo, MethodData::invocation_counter_offset() +
746 InvocationCounter::counter_offset());
747 const Address mask(mdo, MethodData::invoke_mask_offset());
748 __ increment_mask_and_jump(mdo_invocation_counter, increment, mask,
749 Z_R1_scratch, false, Assembler::bcondZero,
750 overflow);
751 __ z_bru(done);
752 __ bind(no_mdo);
753 }
754
755 // Increment counter in MethodCounters.
756 const Address invocation_counter(m_counters,
757 MethodCounters::invocation_counter_offset() +
758 InvocationCounter::counter_offset());
759 // Get address of MethodCounters object.
760 __ get_method_counters(method, m_counters, done);
761 const Address mask(m_counters, MethodCounters::invoke_mask_offset());
762 __ increment_mask_and_jump(invocation_counter,
763 increment, mask,
764 Z_R1_scratch, false, Assembler::bcondZero,
765 overflow);
766 } else {
767 Register counter_sum = Z_ARG3; // The result of this piece of code.
768 Register tmp = Z_R1_scratch;
769 #ifdef ASSERT
770 {
771 NearLabel ok;
772 __ get_method(tmp);
773 __ compare64_and_branch(method, tmp, Assembler::bcondEqual, ok);
774 __ z_illtrap(0x66);
775 __ bind(ok);
776 }
777 #endif
778
779 // Get address of MethodCounters object.
780 __ get_method_counters(method, m_counters, done);
781 // Update standard invocation counters.
782 __ increment_invocation_counter(m_counters, counter_sum);
783 if (ProfileInterpreter) {
784 __ add2mem_32(Address(m_counters, MethodCounters::interpreter_invocation_counter_offset()), 1, tmp);
785 if (profile_method != NULL) {
786 const Address profile_limit(m_counters, MethodCounters::interpreter_profile_limit_offset());
787 __ z_cl(counter_sum, profile_limit);
788 __ branch_optimized(Assembler::bcondLow, *profile_method_continue);
789 // If no method data exists, go to profile_method.
790 __ test_method_data_pointer(tmp, *profile_method);
791 }
792 }
793
794 const Address invocation_limit(m_counters, MethodCounters::interpreter_invocation_limit_offset());
795 __ z_cl(counter_sum, invocation_limit);
796 __ branch_optimized(Assembler::bcondNotLow, *overflow);
797 }
798
799 __ bind(done);
800
801 BLOCK_COMMENT("} counter_incr");
802 }
803
generate_counter_overflow(Label & do_continue)804 void TemplateInterpreterGenerator::generate_counter_overflow(Label& do_continue) {
805 // InterpreterRuntime::frequency_counter_overflow takes two
806 // arguments, the first (thread) is passed by call_VM, the second
807 // indicates if the counter overflow occurs at a backwards branch
808 // (NULL bcp). We pass zero for it. The call returns the address
809 // of the verified entry point for the method or NULL if the
810 // compilation did not complete (either went background or bailed
811 // out).
812 __ clear_reg(Z_ARG2);
813 __ call_VM(noreg,
814 CAST_FROM_FN_PTR(address, InterpreterRuntime::frequency_counter_overflow),
815 Z_ARG2);
816 __ z_bru(do_continue);
817 }
818
generate_stack_overflow_check(Register frame_size,Register tmp1)819 void TemplateInterpreterGenerator::generate_stack_overflow_check(Register frame_size, Register tmp1) {
820 Register tmp2 = Z_R1_scratch;
821 const int page_size = os::vm_page_size();
822 NearLabel after_frame_check;
823
824 BLOCK_COMMENT("stack_overflow_check {");
825
826 assert_different_registers(frame_size, tmp1);
827
828 // Stack banging is sufficient overflow check if frame_size < page_size.
829 if (Immediate::is_uimm(page_size, 15)) {
830 __ z_chi(frame_size, page_size);
831 __ z_brl(after_frame_check);
832 } else {
833 __ load_const_optimized(tmp1, page_size);
834 __ compareU32_and_branch(frame_size, tmp1, Assembler::bcondLow, after_frame_check);
835 }
836
837 // Get the stack base, and in debug, verify it is non-zero.
838 __ z_lg(tmp1, thread_(stack_base));
839 #ifdef ASSERT
840 address reentry = NULL;
841 NearLabel base_not_zero;
842 __ compareU64_and_branch(tmp1, (intptr_t)0L, Assembler::bcondNotEqual, base_not_zero);
843 reentry = __ stop_chain_static(reentry, "stack base is zero in generate_stack_overflow_check");
844 __ bind(base_not_zero);
845 #endif
846
847 // Get the stack size, and in debug, verify it is non-zero.
848 assert(sizeof(size_t) == sizeof(intptr_t), "wrong load size");
849 __ z_lg(tmp2, thread_(stack_size));
850 #ifdef ASSERT
851 NearLabel size_not_zero;
852 __ compareU64_and_branch(tmp2, (intptr_t)0L, Assembler::bcondNotEqual, size_not_zero);
853 reentry = __ stop_chain_static(reentry, "stack size is zero in generate_stack_overflow_check");
854 __ bind(size_not_zero);
855 #endif
856
857 // Compute the beginning of the protected zone minus the requested frame size.
858 __ z_sgr(tmp1, tmp2);
859 __ add2reg(tmp1, JavaThread::stack_guard_zone_size());
860
861 // Add in the size of the frame (which is the same as subtracting it from the
862 // SP, which would take another register.
863 __ z_agr(tmp1, frame_size);
864
865 // The frame is greater than one page in size, so check against
866 // the bottom of the stack.
867 __ compareU64_and_branch(Z_SP, tmp1, Assembler::bcondHigh, after_frame_check);
868
869 // The stack will overflow, throw an exception.
870
871 // Restore SP to sender's sp. This is necessary if the sender's frame is an
872 // extended compiled frame (see gen_c2i_adapter()) and safer anyway in case of
873 // JSR292 adaptations.
874 __ resize_frame_absolute(Z_R10, tmp1, true/*load_fp*/);
875
876 // Note also that the restored frame is not necessarily interpreted.
877 // Use the shared runtime version of the StackOverflowError.
878 assert(StubRoutines::throw_StackOverflowError_entry() != NULL, "stub not yet generated");
879 AddressLiteral stub(StubRoutines::throw_StackOverflowError_entry());
880 __ load_absolute_address(tmp1, StubRoutines::throw_StackOverflowError_entry());
881 __ z_br(tmp1);
882
883 // If you get to here, then there is enough stack space.
884 __ bind(after_frame_check);
885
886 BLOCK_COMMENT("} stack_overflow_check");
887 }
888
889 // Allocate monitor and lock method (asm interpreter).
890 //
891 // Args:
892 // Z_locals: locals
893
lock_method(void)894 void TemplateInterpreterGenerator::lock_method(void) {
895
896 BLOCK_COMMENT("lock_method {");
897
898 // Synchronize method.
899 const Register method = Z_tmp_2;
900 __ get_method(method);
901
902 #ifdef ASSERT
903 address reentry = NULL;
904 {
905 Label L;
906 __ testbit(method2_(method, access_flags), JVM_ACC_SYNCHRONIZED_BIT);
907 __ z_btrue(L);
908 reentry = __ stop_chain_static(reentry, "method doesn't need synchronization");
909 __ bind(L);
910 }
911 #endif // ASSERT
912
913 // Get synchronization object.
914 const Register object = Z_tmp_2;
915
916 {
917 Label done;
918 Label static_method;
919
920 __ testbit(method2_(method, access_flags), JVM_ACC_STATIC_BIT);
921 __ z_btrue(static_method);
922
923 // non-static method: Load receiver obj from stack.
924 __ mem2reg_opt(object, Address(Z_locals, Interpreter::local_offset_in_bytes(0)));
925 __ z_bru(done);
926
927 __ bind(static_method);
928
929 // Lock the java mirror.
930 // Load mirror from interpreter frame.
931 __ z_lg(object, _z_ijava_state_neg(mirror), Z_fp);
932
933 #ifdef ASSERT
934 {
935 NearLabel L;
936 __ compare64_and_branch(object, (intptr_t) 0, Assembler::bcondNotEqual, L);
937 reentry = __ stop_chain_static(reentry, "synchronization object is NULL");
938 __ bind(L);
939 }
940 #endif // ASSERT
941
942 __ bind(done);
943 }
944
945 __ add_monitor_to_stack(true, Z_ARG3, Z_ARG4, Z_ARG5); // Allocate monitor elem.
946 // Store object and lock it.
947 __ get_monitors(Z_tmp_1);
948 __ reg2mem_opt(object, Address(Z_tmp_1, BasicObjectLock::obj_offset_in_bytes()));
949 __ lock_object(Z_tmp_1, object);
950
951 BLOCK_COMMENT("} lock_method");
952 }
953
954 // Generate a fixed interpreter frame. This is identical setup for
955 // interpreted methods and for native methods hence the shared code.
956 //
957 // Registers alive
958 // Z_thread - JavaThread*
959 // Z_SP - old stack pointer
960 // Z_method - callee's method
961 // Z_esp - parameter list (slot 'above' last param)
962 // Z_R14 - return pc, to be stored in caller's frame
963 // Z_R10 - sender sp, note: Z_tmp_1 is Z_R10!
964 //
965 // Registers updated
966 // Z_SP - new stack pointer
967 // Z_esp - callee's operand stack pointer
968 // points to the slot above the value on top
969 // Z_locals - used to access locals: locals[i] := *(Z_locals - i*BytesPerWord)
970 // Z_bcp - the bytecode pointer
971 // Z_fp - the frame pointer, thereby killing Z_method
972 // Z_ARG2 - copy of Z_method
973 //
generate_fixed_frame(bool native_call)974 void TemplateInterpreterGenerator::generate_fixed_frame(bool native_call) {
975
976 // stack layout
977 //
978 // F1 [TOP_IJAVA_FRAME_ABI] <-- Z_SP, Z_R10 (see note below)
979 // [F1's operand stack (unused)]
980 // [F1's outgoing Java arguments] <-- Z_esp
981 // [F1's operand stack (non args)]
982 // [monitors] (optional)
983 // [IJAVA_STATE]
984 //
985 // F2 [PARENT_IJAVA_FRAME_ABI]
986 // ...
987 //
988 // 0x000
989 //
990 // Note: Z_R10, the sender sp, will be below Z_SP if F1 was extended by a c2i adapter.
991
992 //=============================================================================
993 // Allocate space for locals other than the parameters, the
994 // interpreter state, monitors, and the expression stack.
995
996 const Register local_count = Z_ARG5;
997 const Register fp = Z_tmp_2;
998 const Register const_method = Z_ARG1;
999
1000 BLOCK_COMMENT("generate_fixed_frame {");
1001 {
1002 // local registers
1003 const Register top_frame_size = Z_ARG2;
1004 const Register sp_after_resize = Z_ARG3;
1005 const Register max_stack = Z_ARG4;
1006
1007 __ z_lg(const_method, Address(Z_method, Method::const_offset()));
1008 __ z_llgh(max_stack, Address(const_method, ConstMethod::size_of_parameters_offset()));
1009 __ z_sllg(Z_locals /*parameter_count bytes*/, max_stack /*parameter_count*/, LogBytesPerWord);
1010
1011 if (native_call) {
1012 // If we're calling a native method, we replace max_stack (which is
1013 // zero) with space for the worst-case signature handler varargs
1014 // vector, which is:
1015 // max_stack = max(Argument::n_register_parameters, parameter_count+2);
1016 //
1017 // We add two slots to the parameter_count, one for the jni
1018 // environment and one for a possible native mirror. We allocate
1019 // space for at least the number of ABI registers, even though
1020 // InterpreterRuntime::slow_signature_handler won't write more than
1021 // parameter_count+2 words when it creates the varargs vector at the
1022 // top of the stack. The generated slow signature handler will just
1023 // load trash into registers beyond the necessary number. We're
1024 // still going to cut the stack back by the ABI register parameter
1025 // count so as to get SP+16 pointing at the ABI outgoing parameter
1026 // area, so we need to allocate at least that much even though we're
1027 // going to throw it away.
1028 //
1029 __ add2reg(max_stack, 2);
1030
1031 NearLabel passing_args_on_stack;
1032
1033 // max_stack in bytes
1034 __ z_sllg(max_stack, max_stack, LogBytesPerWord);
1035
1036 int argument_registers_in_bytes = Argument::n_register_parameters << LogBytesPerWord;
1037 __ compare64_and_branch(max_stack, argument_registers_in_bytes, Assembler::bcondNotLow, passing_args_on_stack);
1038
1039 __ load_const_optimized(max_stack, argument_registers_in_bytes);
1040
1041 __ bind(passing_args_on_stack);
1042 } else {
1043 // !native_call
1044 // local_count = method->constMethod->max_locals();
1045 __ z_llgh(local_count, Address(const_method, ConstMethod::size_of_locals_offset()));
1046
1047 // Calculate number of non-parameter locals (in slots):
1048 __ z_sgr(local_count, max_stack);
1049
1050 // max_stack = method->max_stack();
1051 __ z_llgh(max_stack, Address(const_method, ConstMethod::max_stack_offset()));
1052 // max_stack in bytes
1053 __ z_sllg(max_stack, max_stack, LogBytesPerWord);
1054 }
1055
1056 // Resize (i.e. normally shrink) the top frame F1 ...
1057 // F1 [TOP_IJAVA_FRAME_ABI] <-- Z_SP, Z_R10
1058 // F1's operand stack (free)
1059 // ...
1060 // F1's operand stack (free) <-- Z_esp
1061 // F1's outgoing Java arg m
1062 // ...
1063 // F1's outgoing Java arg 0
1064 // ...
1065 //
1066 // ... into a parent frame (Z_R10 holds F1's SP before any modification, see also above)
1067 //
1068 // +......................+
1069 // : : <-- Z_R10, saved below as F0's z_ijava_state.sender_sp
1070 // : :
1071 // F1 [PARENT_IJAVA_FRAME_ABI] <-- Z_SP \
1072 // F0's non arg local | = delta
1073 // ... |
1074 // F0's non arg local <-- Z_esp /
1075 // F1's outgoing Java arg m
1076 // ...
1077 // F1's outgoing Java arg 0
1078 // ...
1079 //
1080 // then push the new top frame F0.
1081 //
1082 // F0 [TOP_IJAVA_FRAME_ABI] = frame::z_top_ijava_frame_abi_size \
1083 // [operand stack] = max_stack | = top_frame_size
1084 // [IJAVA_STATE] = frame::z_ijava_state_size /
1085
1086 // sp_after_resize = Z_esp - delta
1087 //
1088 // delta = PARENT_IJAVA_FRAME_ABI + (locals_count - params_count)
1089
1090 __ add2reg(sp_after_resize, (Interpreter::stackElementSize) - (frame::z_parent_ijava_frame_abi_size), Z_esp);
1091 if (!native_call) {
1092 __ z_sllg(Z_R0_scratch, local_count, LogBytesPerWord); // Params have already been subtracted from local_count.
1093 __ z_slgr(sp_after_resize, Z_R0_scratch);
1094 }
1095
1096 // top_frame_size = TOP_IJAVA_FRAME_ABI + max_stack + size of interpreter state
1097 __ add2reg(top_frame_size,
1098 frame::z_top_ijava_frame_abi_size +
1099 frame::z_ijava_state_size,
1100 max_stack);
1101
1102 if (!native_call) {
1103 // Stack overflow check.
1104 // Native calls don't need the stack size check since they have no
1105 // expression stack and the arguments are already on the stack and
1106 // we only add a handful of words to the stack.
1107 Register frame_size = max_stack; // Reuse the register for max_stack.
1108 __ z_lgr(frame_size, Z_SP);
1109 __ z_sgr(frame_size, sp_after_resize);
1110 __ z_agr(frame_size, top_frame_size);
1111 generate_stack_overflow_check(frame_size, fp/*tmp1*/);
1112 }
1113
1114 DEBUG_ONLY(__ z_cg(Z_R14, _z_abi16(return_pc), Z_SP));
1115 __ asm_assert_eq("killed Z_R14", 0);
1116 __ resize_frame_absolute(sp_after_resize, fp, true);
1117 __ save_return_pc(Z_R14);
1118
1119 // ... and push the new frame F0.
1120 __ push_frame(top_frame_size, fp, true /*copy_sp*/, false);
1121 }
1122
1123 //=============================================================================
1124 // Initialize the new frame F0: initialize interpreter state.
1125
1126 {
1127 // locals
1128 const Register local_addr = Z_ARG4;
1129
1130 BLOCK_COMMENT("generate_fixed_frame: initialize interpreter state {");
1131
1132 #ifdef ASSERT
1133 // Set the magic number (using local_addr as tmp register).
1134 __ load_const_optimized(local_addr, frame::z_istate_magic_number);
1135 __ z_stg(local_addr, _z_ijava_state_neg(magic), fp);
1136 #endif
1137
1138 // Save sender SP from F1 (i.e. before it was potentially modified by an
1139 // adapter) into F0's interpreter state. We use it as well to revert
1140 // resizing the frame above.
1141 __ z_stg(Z_R10, _z_ijava_state_neg(sender_sp), fp);
1142
1143 // Load cp cache and save it at the end of this block.
1144 __ z_lg(Z_R1_scratch, Address(const_method, ConstMethod::constants_offset()));
1145 __ z_lg(Z_R1_scratch, Address(Z_R1_scratch, ConstantPool::cache_offset_in_bytes()));
1146
1147 // z_ijava_state->method = method;
1148 __ z_stg(Z_method, _z_ijava_state_neg(method), fp);
1149
1150 // Point locals at the first argument. Method's locals are the
1151 // parameters on top of caller's expression stack.
1152 // Tos points past last Java argument.
1153
1154 __ z_agr(Z_locals, Z_esp);
1155 // z_ijava_state->locals - i*BytesPerWord points to i-th Java local (i starts at 0)
1156 // z_ijava_state->locals = Z_esp + parameter_count bytes
1157 __ z_stg(Z_locals, _z_ijava_state_neg(locals), fp);
1158
1159 // z_ijava_state->oop_temp = NULL;
1160 __ store_const(Address(fp, oop_tmp_offset), 0);
1161
1162 // Initialize z_ijava_state->mdx.
1163 Register Rmdp = Z_bcp;
1164 // native_call: assert that mdo == NULL
1165 const bool check_for_mdo = !native_call DEBUG_ONLY(|| native_call);
1166 if (ProfileInterpreter && check_for_mdo) {
1167 Label get_continue;
1168
1169 __ load_and_test_long(Rmdp, method_(method_data));
1170 __ z_brz(get_continue);
1171 DEBUG_ONLY(if (native_call) __ stop("native methods don't have a mdo"));
1172 __ add2reg(Rmdp, in_bytes(MethodData::data_offset()));
1173 __ bind(get_continue);
1174 }
1175 __ z_stg(Rmdp, _z_ijava_state_neg(mdx), fp);
1176
1177 // Initialize z_ijava_state->bcp and Z_bcp.
1178 if (native_call) {
1179 __ clear_reg(Z_bcp); // Must initialize. Will get written into frame where GC reads it.
1180 } else {
1181 __ add2reg(Z_bcp, in_bytes(ConstMethod::codes_offset()), const_method);
1182 }
1183 __ z_stg(Z_bcp, _z_ijava_state_neg(bcp), fp);
1184
1185 // no monitors and empty operand stack
1186 // => z_ijava_state->monitors points to the top slot in IJAVA_STATE.
1187 // => Z_ijava_state->esp points one slot above into the operand stack.
1188 // z_ijava_state->monitors = fp - frame::z_ijava_state_size - Interpreter::stackElementSize;
1189 // z_ijava_state->esp = Z_esp = z_ijava_state->monitors;
1190 __ add2reg(Z_esp, -frame::z_ijava_state_size, fp);
1191 __ z_stg(Z_esp, _z_ijava_state_neg(monitors), fp);
1192 __ add2reg(Z_esp, -Interpreter::stackElementSize);
1193 __ z_stg(Z_esp, _z_ijava_state_neg(esp), fp);
1194
1195 // z_ijava_state->cpoolCache = Z_R1_scratch (see load above);
1196 __ z_stg(Z_R1_scratch, _z_ijava_state_neg(cpoolCache), fp);
1197
1198 // Get mirror and store it in the frame as GC root for this Method*.
1199 __ load_mirror_from_const_method(Z_R1_scratch, const_method);
1200 __ z_stg(Z_R1_scratch, _z_ijava_state_neg(mirror), fp);
1201
1202 BLOCK_COMMENT("} generate_fixed_frame: initialize interpreter state");
1203
1204 //=============================================================================
1205 if (!native_call) {
1206 // Local_count is already num_locals_slots - num_param_slots.
1207 // Start of locals: local_addr = Z_locals - locals size + 1 slot
1208 __ z_llgh(Z_R0_scratch, Address(const_method, ConstMethod::size_of_locals_offset()));
1209 __ add2reg(local_addr, BytesPerWord, Z_locals);
1210 __ z_sllg(Z_R0_scratch, Z_R0_scratch, LogBytesPerWord);
1211 __ z_sgr(local_addr, Z_R0_scratch);
1212
1213 __ Clear_Array(local_count, local_addr, Z_ARG2);
1214 }
1215
1216 }
1217 // Finally set the frame pointer, destroying Z_method.
1218 assert(Z_fp == Z_method, "maybe set Z_fp earlier if other register than Z_method");
1219 // Oprofile analysis suggests to keep a copy in a register to be used by
1220 // generate_counter_incr().
1221 __ z_lgr(Z_ARG2, Z_method);
1222 __ z_lgr(Z_fp, fp);
1223
1224 BLOCK_COMMENT("} generate_fixed_frame");
1225 }
1226
1227 // Various method entries
1228
1229 // Math function, frame manager must set up an interpreter state, etc.
generate_math_entry(AbstractInterpreter::MethodKind kind)1230 address TemplateInterpreterGenerator::generate_math_entry(AbstractInterpreter::MethodKind kind) {
1231
1232 // Decide what to do: Use same platform specific instructions and runtime calls as compilers.
1233 bool use_instruction = false;
1234 address runtime_entry = NULL;
1235 int num_args = 1;
1236 bool double_precision = true;
1237
1238 // s390 specific:
1239 switch (kind) {
1240 case Interpreter::java_lang_math_sqrt:
1241 case Interpreter::java_lang_math_abs: use_instruction = true; break;
1242 case Interpreter::java_lang_math_fmaF:
1243 case Interpreter::java_lang_math_fmaD: use_instruction = UseFMA; break;
1244 default: break; // Fall back to runtime call.
1245 }
1246
1247 switch (kind) {
1248 case Interpreter::java_lang_math_sin : runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dsin); break;
1249 case Interpreter::java_lang_math_cos : runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dcos); break;
1250 case Interpreter::java_lang_math_tan : runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dtan); break;
1251 case Interpreter::java_lang_math_abs : /* run interpreted */ break;
1252 case Interpreter::java_lang_math_sqrt : /* runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dsqrt); not available */ break;
1253 case Interpreter::java_lang_math_log : runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dlog); break;
1254 case Interpreter::java_lang_math_log10: runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dlog10); break;
1255 case Interpreter::java_lang_math_pow : runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dpow); num_args = 2; break;
1256 case Interpreter::java_lang_math_exp : runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dexp); break;
1257 case Interpreter::java_lang_math_fmaF : /* run interpreted */ num_args = 3; double_precision = false; break;
1258 case Interpreter::java_lang_math_fmaD : /* run interpreted */ num_args = 3; break;
1259 default: ShouldNotReachHere();
1260 }
1261
1262 // Use normal entry if neither instruction nor runtime call is used.
1263 if (!use_instruction && runtime_entry == NULL) return NULL;
1264
1265 address entry = __ pc();
1266
1267 if (use_instruction) {
1268 switch (kind) {
1269 case Interpreter::java_lang_math_sqrt:
1270 // Can use memory operand directly.
1271 __ z_sqdb(Z_FRET, Interpreter::stackElementSize, Z_esp);
1272 break;
1273 case Interpreter::java_lang_math_abs:
1274 // Load operand from stack.
1275 __ mem2freg_opt(Z_FRET, Address(Z_esp, Interpreter::stackElementSize));
1276 __ z_lpdbr(Z_FRET);
1277 break;
1278 case Interpreter::java_lang_math_fmaF:
1279 __ mem2freg_opt(Z_FRET, Address(Z_esp, Interpreter::stackElementSize)); // result reg = arg3
1280 __ mem2freg_opt(Z_FARG2, Address(Z_esp, 3 * Interpreter::stackElementSize)); // arg1
1281 __ z_maeb(Z_FRET, Z_FARG2, Address(Z_esp, 2 * Interpreter::stackElementSize));
1282 break;
1283 case Interpreter::java_lang_math_fmaD:
1284 __ mem2freg_opt(Z_FRET, Address(Z_esp, Interpreter::stackElementSize)); // result reg = arg3
1285 __ mem2freg_opt(Z_FARG2, Address(Z_esp, 5 * Interpreter::stackElementSize)); // arg1
1286 __ z_madb(Z_FRET, Z_FARG2, Address(Z_esp, 3 * Interpreter::stackElementSize));
1287 break;
1288 default: ShouldNotReachHere();
1289 }
1290 } else {
1291 // Load arguments
1292 assert(num_args <= 4, "passed in registers");
1293 if (double_precision) {
1294 int offset = (2 * num_args - 1) * Interpreter::stackElementSize;
1295 for (int i = 0; i < num_args; ++i) {
1296 __ mem2freg_opt(as_FloatRegister(Z_FARG1->encoding() + 2 * i), Address(Z_esp, offset));
1297 offset -= 2 * Interpreter::stackElementSize;
1298 }
1299 } else {
1300 int offset = num_args * Interpreter::stackElementSize;
1301 for (int i = 0; i < num_args; ++i) {
1302 __ mem2freg_opt(as_FloatRegister(Z_FARG1->encoding() + 2 * i), Address(Z_esp, offset));
1303 offset -= Interpreter::stackElementSize;
1304 }
1305 }
1306 // Call runtime
1307 __ save_return_pc(); // Save Z_R14.
1308 __ push_frame_abi160(0); // Without new frame the RT call could overwrite the saved Z_R14.
1309
1310 __ call_VM_leaf(runtime_entry);
1311
1312 __ pop_frame();
1313 __ restore_return_pc(); // Restore Z_R14.
1314 }
1315
1316 // Pop c2i arguments (if any) off when we return.
1317 __ resize_frame_absolute(Z_R10, Z_R0, true); // Cut the stack back to where the caller started.
1318
1319 __ z_br(Z_R14);
1320
1321 return entry;
1322 }
1323
1324 // Interpreter stub for calling a native method. (asm interpreter).
1325 // This sets up a somewhat different looking stack for calling the
1326 // native method than the typical interpreter frame setup.
generate_native_entry(bool synchronized)1327 address TemplateInterpreterGenerator::generate_native_entry(bool synchronized) {
1328 // Determine code generation flags.
1329 bool inc_counter = UseCompiler || CountCompiledCalls || LogTouchedMethods;
1330
1331 // Interpreter entry for ordinary Java methods.
1332 //
1333 // Registers alive
1334 // Z_SP - stack pointer
1335 // Z_thread - JavaThread*
1336 // Z_method - callee's method (method to be invoked)
1337 // Z_esp - operand (or expression) stack pointer of caller. one slot above last arg.
1338 // Z_R10 - sender sp (before modifications, e.g. by c2i adapter
1339 // and as well by generate_fixed_frame below)
1340 // Z_R14 - return address to caller (call_stub or c2i_adapter)
1341 //
1342 // Registers updated
1343 // Z_SP - stack pointer
1344 // Z_fp - callee's framepointer
1345 // Z_esp - callee's operand stack pointer
1346 // points to the slot above the value on top
1347 // Z_locals - used to access locals: locals[i] := *(Z_locals - i*BytesPerWord)
1348 // Z_tos - integer result, if any
1349 // z_ftos - floating point result, if any
1350 //
1351 // Stack layout at this point:
1352 //
1353 // F1 [TOP_IJAVA_FRAME_ABI] <-- Z_SP, Z_R10 (Z_R10 will be below Z_SP if
1354 // frame was extended by c2i adapter)
1355 // [outgoing Java arguments] <-- Z_esp
1356 // ...
1357 // PARENT [PARENT_IJAVA_FRAME_ABI]
1358 // ...
1359 //
1360
1361 address entry_point = __ pc();
1362
1363 // Make sure registers are different!
1364 assert_different_registers(Z_thread, Z_method, Z_esp);
1365
1366 BLOCK_COMMENT("native_entry {");
1367
1368 // Make sure method is native and not abstract.
1369 #ifdef ASSERT
1370 address reentry = NULL;
1371 { Label L;
1372 __ testbit(method_(access_flags), JVM_ACC_NATIVE_BIT);
1373 __ z_btrue(L);
1374 reentry = __ stop_chain_static(reentry, "tried to execute non-native method as native");
1375 __ bind(L);
1376 }
1377 { Label L;
1378 __ testbit(method_(access_flags), JVM_ACC_ABSTRACT_BIT);
1379 __ z_bfalse(L);
1380 reentry = __ stop_chain_static(reentry, "tried to execute abstract method as non-abstract");
1381 __ bind(L);
1382 }
1383 #endif // ASSERT
1384
1385 #ifdef ASSERT
1386 // Save the return PC into the callers frame for assertion in generate_fixed_frame.
1387 __ save_return_pc(Z_R14);
1388 #endif
1389
1390 // Generate the code to allocate the interpreter stack frame.
1391 generate_fixed_frame(true);
1392
1393 const Address do_not_unlock_if_synchronized(Z_thread, JavaThread::do_not_unlock_if_synchronized_offset());
1394 // Since at this point in the method invocation the exception handler
1395 // would try to exit the monitor of synchronized methods which hasn't
1396 // been entered yet, we set the thread local variable
1397 // _do_not_unlock_if_synchronized to true. If any exception was thrown by
1398 // runtime, exception handling i.e. unlock_if_synchronized_method will
1399 // check this thread local flag.
1400 __ z_mvi(do_not_unlock_if_synchronized, true);
1401
1402 // Increment invocation count and check for overflow.
1403 NearLabel invocation_counter_overflow;
1404 if (inc_counter) {
1405 generate_counter_incr(&invocation_counter_overflow, NULL, NULL);
1406 }
1407
1408 Label continue_after_compile;
1409 __ bind(continue_after_compile);
1410
1411 bang_stack_shadow_pages(true);
1412
1413 // Reset the _do_not_unlock_if_synchronized flag.
1414 __ z_mvi(do_not_unlock_if_synchronized, false);
1415
1416 // Check for synchronized methods.
1417 // This mst happen AFTER invocation_counter check and stack overflow check,
1418 // so method is not locked if overflows.
1419 if (synchronized) {
1420 lock_method();
1421 } else {
1422 // No synchronization necessary.
1423 #ifdef ASSERT
1424 { Label L;
1425 __ get_method(Z_R1_scratch);
1426 __ testbit(method2_(Z_R1_scratch, access_flags), JVM_ACC_SYNCHRONIZED_BIT);
1427 __ z_bfalse(L);
1428 reentry = __ stop_chain_static(reentry, "method needs synchronization");
1429 __ bind(L);
1430 }
1431 #endif // ASSERT
1432 }
1433
1434 // start execution
1435
1436 // jvmti support
1437 __ notify_method_entry();
1438
1439 //=============================================================================
1440 // Get and call the signature handler.
1441 const Register Rmethod = Z_tmp_2;
1442 const Register signature_handler_entry = Z_tmp_1;
1443 const Register Rresult_handler = Z_tmp_3;
1444 Label call_signature_handler;
1445
1446 assert_different_registers(Z_fp, Rmethod, signature_handler_entry, Rresult_handler);
1447 assert(Rresult_handler->is_nonvolatile(), "Rresult_handler must be in a non-volatile register");
1448
1449 // Reload method.
1450 __ get_method(Rmethod);
1451
1452 // Check for signature handler.
1453 __ load_and_test_long(signature_handler_entry, method2_(Rmethod, signature_handler));
1454 __ z_brne(call_signature_handler);
1455
1456 // Method has never been called. Either generate a specialized
1457 // handler or point to the slow one.
1458 __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::prepare_native_call),
1459 Rmethod);
1460
1461 // Reload method.
1462 __ get_method(Rmethod);
1463
1464 // Reload signature handler, it must have been created/assigned in the meantime.
1465 __ z_lg(signature_handler_entry, method2_(Rmethod, signature_handler));
1466
1467 __ bind(call_signature_handler);
1468
1469 // We have a TOP_IJAVA_FRAME here, which belongs to us.
1470 __ set_top_ijava_frame_at_SP_as_last_Java_frame(Z_SP, Z_R1/*tmp*/);
1471
1472 // Call signature handler and pass locals address in Z_ARG1.
1473 __ z_lgr(Z_ARG1, Z_locals);
1474 __ call_stub(signature_handler_entry);
1475 // Save result handler returned by signature handler.
1476 __ z_lgr(Rresult_handler, Z_RET);
1477
1478 // Reload method (the slow signature handler may block for GC).
1479 __ get_method(Rmethod);
1480
1481 // Pass mirror handle if static call.
1482 {
1483 Label method_is_not_static;
1484 __ testbit(method2_(Rmethod, access_flags), JVM_ACC_STATIC_BIT);
1485 __ z_bfalse(method_is_not_static);
1486 // Load mirror from interpreter frame.
1487 __ z_lg(Z_R1, _z_ijava_state_neg(mirror), Z_fp);
1488 // z_ijava_state.oop_temp = pool_holder->klass_part()->java_mirror();
1489 __ z_stg(Z_R1, oop_tmp_offset, Z_fp);
1490 // Pass handle to mirror as 2nd argument to JNI method.
1491 __ add2reg(Z_ARG2, oop_tmp_offset, Z_fp);
1492 __ bind(method_is_not_static);
1493 }
1494
1495 // Pass JNIEnv address as first parameter.
1496 __ add2reg(Z_ARG1, in_bytes(JavaThread::jni_environment_offset()), Z_thread);
1497
1498 // Note: last java frame has been set above already. The pc from there
1499 // is precise enough.
1500
1501 // Get native function entry point before we change the thread state.
1502 __ z_lg(Z_R1/*native_method_entry*/, method2_(Rmethod, native_function));
1503
1504 //=============================================================================
1505 // Transition from _thread_in_Java to _thread_in_native. As soon as
1506 // we make this change the safepoint code needs to be certain that
1507 // the last Java frame we established is good. The pc in that frame
1508 // just need to be near here not an actual return address.
1509 #ifdef ASSERT
1510 {
1511 NearLabel L;
1512 __ mem2reg_opt(Z_R14, Address(Z_thread, JavaThread::thread_state_offset()), false /*32 bits*/);
1513 __ compareU32_and_branch(Z_R14, _thread_in_Java, Assembler::bcondEqual, L);
1514 reentry = __ stop_chain_static(reentry, "Wrong thread state in native stub");
1515 __ bind(L);
1516 }
1517 #endif
1518
1519 // Memory ordering: Z does not reorder store/load with subsequent load. That's strong enough.
1520 __ set_thread_state(_thread_in_native);
1521
1522 //=============================================================================
1523 // Call the native method. Argument registers must not have been
1524 // overwritten since "__ call_stub(signature_handler);" (except for
1525 // ARG1 and ARG2 for static methods).
1526
1527 __ call_c(Z_R1/*native_method_entry*/);
1528
1529 // NOTE: frame::interpreter_frame_result() depends on these stores.
1530 __ z_stg(Z_RET, _z_ijava_state_neg(lresult), Z_fp);
1531 __ freg2mem_opt(Z_FRET, Address(Z_fp, _z_ijava_state_neg(fresult)));
1532 const Register Rlresult = signature_handler_entry;
1533 assert(Rlresult->is_nonvolatile(), "Rlresult must be in a non-volatile register");
1534 __ z_lgr(Rlresult, Z_RET);
1535
1536 // Z_method may no longer be valid, because of GC.
1537
1538 // Block, if necessary, before resuming in _thread_in_Java state.
1539 // In order for GC to work, don't clear the last_Java_sp until after
1540 // blocking.
1541
1542 //=============================================================================
1543 // Switch thread to "native transition" state before reading the
1544 // synchronization state. This additional state is necessary
1545 // because reading and testing the synchronization state is not
1546 // atomic w.r.t. GC, as this scenario demonstrates: Java thread A,
1547 // in _thread_in_native state, loads _not_synchronized and is
1548 // preempted. VM thread changes sync state to synchronizing and
1549 // suspends threads for GC. Thread A is resumed to finish this
1550 // native method, but doesn't block here since it didn't see any
1551 // synchronization is progress, and escapes.
1552
1553 __ set_thread_state(_thread_in_native_trans);
1554 __ z_fence();
1555
1556 // Now before we return to java we must look for a current safepoint
1557 // (a new safepoint can not start since we entered native_trans).
1558 // We must check here because a current safepoint could be modifying
1559 // the callers registers right this moment.
1560
1561 // Check for safepoint operation in progress and/or pending suspend requests.
1562 {
1563 Label Continue, do_safepoint;
1564 __ safepoint_poll(do_safepoint, Z_R1);
1565 // Check for suspend.
1566 __ load_and_test_int(Z_R0/*suspend_flags*/, thread_(suspend_flags));
1567 __ z_bre(Continue); // 0 -> no flag set -> not suspended
1568 __ bind(do_safepoint);
1569 __ z_lgr(Z_ARG1, Z_thread);
1570 __ call_c(CAST_FROM_FN_PTR(address, JavaThread::check_special_condition_for_native_trans));
1571 __ bind(Continue);
1572 }
1573
1574 //=============================================================================
1575 // Back in Interpreter Frame.
1576
1577 // We are in thread_in_native_trans here and back in the normal
1578 // interpreter frame. We don't have to do anything special about
1579 // safepoints and we can switch to Java mode anytime we are ready.
1580
1581 // Note: frame::interpreter_frame_result has a dependency on how the
1582 // method result is saved across the call to post_method_exit. For
1583 // native methods it assumes that the non-FPU/non-void result is
1584 // saved in z_ijava_state.lresult and a FPU result in z_ijava_state.fresult. If
1585 // this changes then the interpreter_frame_result implementation
1586 // will need to be updated too.
1587
1588 //=============================================================================
1589 // Back in Java.
1590
1591 // Memory ordering: Z does not reorder store/load with subsequent
1592 // load. That's strong enough.
1593 __ set_thread_state(_thread_in_Java);
1594
1595 __ reset_last_Java_frame();
1596
1597 // We reset the JNI handle block only after unboxing the result; see below.
1598
1599 // The method register is junk from after the thread_in_native transition
1600 // until here. Also can't call_VM until the bcp has been
1601 // restored. Need bcp for throwing exception below so get it now.
1602 __ get_method(Rmethod);
1603
1604 // Restore Z_bcp to have legal interpreter frame,
1605 // i.e., bci == 0 <=> Z_bcp == code_base().
1606 __ z_lg(Z_bcp, Address(Rmethod, Method::const_offset())); // get constMethod
1607 __ add2reg(Z_bcp, in_bytes(ConstMethod::codes_offset())); // get codebase
1608
1609 if (CheckJNICalls) {
1610 // clear_pending_jni_exception_check
1611 __ clear_mem(Address(Z_thread, JavaThread::pending_jni_exception_check_fn_offset()), sizeof(oop));
1612 }
1613
1614 // Check if the native method returns an oop, and if so, move it
1615 // from the jni handle to z_ijava_state.oop_temp. This is
1616 // necessary, because we reset the jni handle block below.
1617 // NOTE: frame::interpreter_frame_result() depends on this, too.
1618 { NearLabel no_oop_result;
1619 __ load_absolute_address(Z_R1, AbstractInterpreter::result_handler(T_OBJECT));
1620 __ compareU64_and_branch(Z_R1, Rresult_handler, Assembler::bcondNotEqual, no_oop_result);
1621 __ resolve_jobject(Rlresult, /* tmp1 */ Rmethod, /* tmp2 */ Z_R1);
1622 __ z_stg(Rlresult, oop_tmp_offset, Z_fp);
1623 __ bind(no_oop_result);
1624 }
1625
1626 // Reset handle block.
1627 __ z_lg(Z_R1/*active_handles*/, thread_(active_handles));
1628 __ clear_mem(Address(Z_R1, JNIHandleBlock::top_offset_in_bytes()), 4);
1629
1630 // Handle exceptions (exception handling will handle unlocking!).
1631 {
1632 Label L;
1633 __ load_and_test_long(Z_R0/*pending_exception*/, thread_(pending_exception));
1634 __ z_bre(L);
1635 __ MacroAssembler::call_VM(noreg,
1636 CAST_FROM_FN_PTR(address,
1637 InterpreterRuntime::throw_pending_exception));
1638 __ should_not_reach_here();
1639 __ bind(L);
1640 }
1641
1642 if (synchronized) {
1643 Register Rfirst_monitor = Z_ARG2;
1644 __ add2reg(Rfirst_monitor, -(frame::z_ijava_state_size + (int)sizeof(BasicObjectLock)), Z_fp);
1645 #ifdef ASSERT
1646 NearLabel ok;
1647 __ z_lg(Z_R1, _z_ijava_state_neg(monitors), Z_fp);
1648 __ compareU64_and_branch(Rfirst_monitor, Z_R1, Assembler::bcondEqual, ok);
1649 reentry = __ stop_chain_static(reentry, "native_entry:unlock: inconsistent z_ijava_state.monitors");
1650 __ bind(ok);
1651 #endif
1652 __ unlock_object(Rfirst_monitor);
1653 }
1654
1655 // JVMTI support. Result has already been saved above to the frame.
1656 __ notify_method_exit(true/*native_method*/, ilgl, InterpreterMacroAssembler::NotifyJVMTI);
1657
1658 // Move native method result back into proper registers and return.
1659 __ mem2freg_opt(Z_FRET, Address(Z_fp, _z_ijava_state_neg(fresult)));
1660 __ mem2reg_opt(Z_RET, Address(Z_fp, _z_ijava_state_neg(lresult)));
1661 __ call_stub(Rresult_handler);
1662
1663 // Pop the native method's interpreter frame.
1664 __ pop_interpreter_frame(Z_R14 /*return_pc*/, Z_ARG2/*tmp1*/, Z_ARG3/*tmp2*/);
1665
1666 // Return to caller.
1667 __ z_br(Z_R14);
1668
1669 if (inc_counter) {
1670 // Handle overflow of counter and compile method.
1671 __ bind(invocation_counter_overflow);
1672 generate_counter_overflow(continue_after_compile);
1673 }
1674
1675 BLOCK_COMMENT("} native_entry");
1676
1677 return entry_point;
1678 }
1679
1680 //
1681 // Generic interpreted method entry to template interpreter.
1682 //
generate_normal_entry(bool synchronized)1683 address TemplateInterpreterGenerator::generate_normal_entry(bool synchronized) {
1684 address entry_point = __ pc();
1685
1686 bool inc_counter = UseCompiler || CountCompiledCalls || LogTouchedMethods;
1687
1688 // Interpreter entry for ordinary Java methods.
1689 //
1690 // Registers alive
1691 // Z_SP - stack pointer
1692 // Z_thread - JavaThread*
1693 // Z_method - callee's method (method to be invoked)
1694 // Z_esp - operand (or expression) stack pointer of caller. one slot above last arg.
1695 // Z_R10 - sender sp (before modifications, e.g. by c2i adapter
1696 // and as well by generate_fixed_frame below)
1697 // Z_R14 - return address to caller (call_stub or c2i_adapter)
1698 //
1699 // Registers updated
1700 // Z_SP - stack pointer
1701 // Z_fp - callee's framepointer
1702 // Z_esp - callee's operand stack pointer
1703 // points to the slot above the value on top
1704 // Z_locals - used to access locals: locals[i] := *(Z_locals - i*BytesPerWord)
1705 // Z_tos - integer result, if any
1706 // z_ftos - floating point result, if any
1707 //
1708 //
1709 // stack layout at this point:
1710 //
1711 // F1 [TOP_IJAVA_FRAME_ABI] <-- Z_SP, Z_R10 (Z_R10 will be below Z_SP if
1712 // frame was extended by c2i adapter)
1713 // [outgoing Java arguments] <-- Z_esp
1714 // ...
1715 // PARENT [PARENT_IJAVA_FRAME_ABI]
1716 // ...
1717 //
1718 // stack layout before dispatching the first bytecode:
1719 //
1720 // F0 [TOP_IJAVA_FRAME_ABI] <-- Z_SP
1721 // [operand stack] <-- Z_esp
1722 // monitor (optional, can grow)
1723 // [IJAVA_STATE]
1724 // F1 [PARENT_IJAVA_FRAME_ABI] <-- Z_fp (== *Z_SP)
1725 // [F0's locals] <-- Z_locals
1726 // [F1's operand stack]
1727 // [F1's monitors] (optional)
1728 // [IJAVA_STATE]
1729
1730 // Make sure registers are different!
1731 assert_different_registers(Z_thread, Z_method, Z_esp);
1732
1733 BLOCK_COMMENT("normal_entry {");
1734
1735 // Make sure method is not native and not abstract.
1736 // Rethink these assertions - they can be simplified and shared.
1737 #ifdef ASSERT
1738 address reentry = NULL;
1739 { Label L;
1740 __ testbit(method_(access_flags), JVM_ACC_NATIVE_BIT);
1741 __ z_bfalse(L);
1742 reentry = __ stop_chain_static(reentry, "tried to execute native method as non-native");
1743 __ bind(L);
1744 }
1745 { Label L;
1746 __ testbit(method_(access_flags), JVM_ACC_ABSTRACT_BIT);
1747 __ z_bfalse(L);
1748 reentry = __ stop_chain_static(reentry, "tried to execute abstract method as non-abstract");
1749 __ bind(L);
1750 }
1751 #endif // ASSERT
1752
1753 #ifdef ASSERT
1754 // Save the return PC into the callers frame for assertion in generate_fixed_frame.
1755 __ save_return_pc(Z_R14);
1756 #endif
1757
1758 // Generate the code to allocate the interpreter stack frame.
1759 generate_fixed_frame(false);
1760
1761 const Address do_not_unlock_if_synchronized(Z_thread, JavaThread::do_not_unlock_if_synchronized_offset());
1762 // Since at this point in the method invocation the exception handler
1763 // would try to exit the monitor of synchronized methods which hasn't
1764 // been entered yet, we set the thread local variable
1765 // _do_not_unlock_if_synchronized to true. If any exception was thrown by
1766 // runtime, exception handling i.e. unlock_if_synchronized_method will
1767 // check this thread local flag.
1768 __ z_mvi(do_not_unlock_if_synchronized, true);
1769
1770 __ profile_parameters_type(Z_tmp_2, Z_ARG3, Z_ARG4);
1771
1772 // Increment invocation counter and check for overflow.
1773 //
1774 // Note: checking for negative value instead of overflow so we have a 'sticky'
1775 // overflow test (may be of importance as soon as we have true MT/MP).
1776 NearLabel invocation_counter_overflow;
1777 NearLabel profile_method;
1778 NearLabel profile_method_continue;
1779 NearLabel Lcontinue;
1780 if (inc_counter) {
1781 generate_counter_incr(&invocation_counter_overflow, &profile_method, &profile_method_continue);
1782 if (ProfileInterpreter) {
1783 __ bind(profile_method_continue);
1784 }
1785 }
1786 __ bind(Lcontinue);
1787
1788 bang_stack_shadow_pages(false);
1789
1790 // Reset the _do_not_unlock_if_synchronized flag.
1791 __ z_mvi(do_not_unlock_if_synchronized, false);
1792
1793 // Check for synchronized methods.
1794 // Must happen AFTER invocation_counter check and stack overflow check,
1795 // so method is not locked if overflows.
1796 if (synchronized) {
1797 // Allocate monitor and lock method.
1798 lock_method();
1799 } else {
1800 #ifdef ASSERT
1801 { Label L;
1802 __ get_method(Z_R1_scratch);
1803 __ testbit(method2_(Z_R1_scratch, access_flags), JVM_ACC_SYNCHRONIZED_BIT);
1804 __ z_bfalse(L);
1805 reentry = __ stop_chain_static(reentry, "method needs synchronization");
1806 __ bind(L);
1807 }
1808 #endif // ASSERT
1809 }
1810
1811 // start execution
1812
1813 #ifdef ASSERT
1814 __ verify_esp(Z_esp, Z_R1_scratch);
1815
1816 __ verify_thread();
1817 #endif
1818
1819 // jvmti support
1820 __ notify_method_entry();
1821
1822 // Start executing instructions.
1823 __ dispatch_next(vtos);
1824 // Dispatch_next does not return.
1825 DEBUG_ONLY(__ should_not_reach_here());
1826
1827 // Invocation counter overflow.
1828 if (inc_counter) {
1829 if (ProfileInterpreter) {
1830 // We have decided to profile this method in the interpreter.
1831 __ bind(profile_method);
1832
1833 __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::profile_method));
1834 __ set_method_data_pointer_for_bcp();
1835 __ z_bru(profile_method_continue);
1836 }
1837
1838 // Handle invocation counter overflow.
1839 __ bind(invocation_counter_overflow);
1840 generate_counter_overflow(Lcontinue);
1841 }
1842
1843 BLOCK_COMMENT("} normal_entry");
1844
1845 return entry_point;
1846 }
1847
1848
1849 /**
1850 * Method entry for static native methods:
1851 * int java.util.zip.CRC32.update(int crc, int b)
1852 */
generate_CRC32_update_entry()1853 address TemplateInterpreterGenerator::generate_CRC32_update_entry() {
1854
1855 if (UseCRC32Intrinsics) {
1856 uint64_t entry_off = __ offset();
1857 Label slow_path;
1858
1859 // If we need a safepoint check, generate full interpreter entry.
1860 __ safepoint_poll(slow_path, Z_R1);
1861
1862 BLOCK_COMMENT("CRC32_update {");
1863
1864 // We don't generate local frame and don't align stack because
1865 // we not even call stub code (we generate the code inline)
1866 // and there is no safepoint on this path.
1867
1868 // Load java parameters.
1869 // Z_esp is callers operand stack pointer, i.e. it points to the parameters.
1870 const Register argP = Z_esp;
1871 const Register crc = Z_ARG1; // crc value
1872 const Register data = Z_ARG2; // address of java byte value (kernel_crc32 needs address)
1873 const Register dataLen = Z_ARG3; // source data len (1 byte). Not used because calling the single-byte emitter.
1874 const Register table = Z_ARG4; // address of crc32 table
1875
1876 // Arguments are reversed on java expression stack.
1877 __ z_la(data, 3+1*wordSize, argP); // byte value (stack address).
1878 // Being passed as an int, the single byte is at offset +3.
1879 __ z_llgf(crc, 2 * wordSize, argP); // Current crc state, zero extend to 64 bit to have a clean register.
1880
1881 StubRoutines::zarch::generate_load_crc_table_addr(_masm, table);
1882 __ kernel_crc32_singleByte(crc, data, dataLen, table, Z_R1, true);
1883
1884 // Restore caller sp for c2i case.
1885 __ resize_frame_absolute(Z_R10, Z_R0, true); // Cut the stack back to where the caller started.
1886
1887 __ z_br(Z_R14);
1888
1889 BLOCK_COMMENT("} CRC32_update");
1890
1891 // Use a previously generated vanilla native entry as the slow path.
1892 BIND(slow_path);
1893 __ jump_to_entry(Interpreter::entry_for_kind(Interpreter::native), Z_R1);
1894 return __ addr_at(entry_off);
1895 }
1896
1897 return NULL;
1898 }
1899
1900
1901 /**
1902 * Method entry for static native methods:
1903 * int java.util.zip.CRC32.updateBytes( int crc, byte[] b, int off, int len)
1904 * int java.util.zip.CRC32.updateByteBuffer(int crc, long* buf, int off, int len)
1905 */
generate_CRC32_updateBytes_entry(AbstractInterpreter::MethodKind kind)1906 address TemplateInterpreterGenerator::generate_CRC32_updateBytes_entry(AbstractInterpreter::MethodKind kind) {
1907
1908 if (UseCRC32Intrinsics) {
1909 uint64_t entry_off = __ offset();
1910 Label slow_path;
1911
1912 // If we need a safepoint check, generate full interpreter entry.
1913 __ safepoint_poll(slow_path, Z_R1);
1914
1915 // We don't generate local frame and don't align stack because
1916 // we call stub code and there is no safepoint on this path.
1917
1918 // Load parameters.
1919 // Z_esp is callers operand stack pointer, i.e. it points to the parameters.
1920 const Register argP = Z_esp;
1921 const Register crc = Z_ARG1; // crc value
1922 const Register data = Z_ARG2; // address of java byte array
1923 const Register dataLen = Z_ARG3; // source data len
1924 const Register table = Z_ARG4; // address of crc32 table
1925 const Register t0 = Z_R10; // work reg for kernel* emitters
1926 const Register t1 = Z_R11; // work reg for kernel* emitters
1927 const Register t2 = Z_R12; // work reg for kernel* emitters
1928 const Register t3 = Z_R13; // work reg for kernel* emitters
1929
1930 // Arguments are reversed on java expression stack.
1931 // Calculate address of start element.
1932 if (kind == Interpreter::java_util_zip_CRC32_updateByteBuffer) { // Used for "updateByteBuffer direct".
1933 // crc @ (SP + 5W) (32bit)
1934 // buf @ (SP + 3W) (64bit ptr to long array)
1935 // off @ (SP + 2W) (32bit)
1936 // dataLen @ (SP + 1W) (32bit)
1937 // data = buf + off
1938 BLOCK_COMMENT("CRC32_updateByteBuffer {");
1939 __ z_llgf(crc, 5*wordSize, argP); // current crc state
1940 __ z_lg(data, 3*wordSize, argP); // start of byte buffer
1941 __ z_agf(data, 2*wordSize, argP); // Add byte buffer offset.
1942 __ z_lgf(dataLen, 1*wordSize, argP); // #bytes to process
1943 } else { // Used for "updateBytes update".
1944 // crc @ (SP + 4W) (32bit)
1945 // buf @ (SP + 3W) (64bit ptr to byte array)
1946 // off @ (SP + 2W) (32bit)
1947 // dataLen @ (SP + 1W) (32bit)
1948 // data = buf + off + base_offset
1949 BLOCK_COMMENT("CRC32_updateBytes {");
1950 __ z_llgf(crc, 4*wordSize, argP); // current crc state
1951 __ z_lg(data, 3*wordSize, argP); // start of byte buffer
1952 __ z_agf(data, 2*wordSize, argP); // Add byte buffer offset.
1953 __ z_lgf(dataLen, 1*wordSize, argP); // #bytes to process
1954 __ z_aghi(data, arrayOopDesc::base_offset_in_bytes(T_BYTE));
1955 }
1956
1957 StubRoutines::zarch::generate_load_crc_table_addr(_masm, table);
1958
1959 __ resize_frame(-(6*8), Z_R0, true); // Resize frame to provide add'l space to spill 5 registers.
1960 __ z_stmg(t0, t3, 1*8, Z_SP); // Spill regs 10..13 to make them available as work registers.
1961 __ kernel_crc32_1word(crc, data, dataLen, table, t0, t1, t2, t3, true);
1962 __ z_lmg(t0, t3, 1*8, Z_SP); // Spill regs 10..13 back from stack.
1963
1964 // Restore caller sp for c2i case.
1965 __ resize_frame_absolute(Z_R10, Z_R0, true); // Cut the stack back to where the caller started.
1966
1967 __ z_br(Z_R14);
1968
1969 BLOCK_COMMENT("} CRC32_update{Bytes|ByteBuffer}");
1970
1971 // Use a previously generated vanilla native entry as the slow path.
1972 BIND(slow_path);
1973 __ jump_to_entry(Interpreter::entry_for_kind(Interpreter::native), Z_R1);
1974 return __ addr_at(entry_off);
1975 }
1976
1977 return NULL;
1978 }
1979
1980
1981 /**
1982 * Method entry for intrinsic-candidate (non-native) methods:
1983 * int java.util.zip.CRC32C.updateBytes( int crc, byte[] b, int off, int end)
1984 * int java.util.zip.CRC32C.updateDirectByteBuffer(int crc, long* buf, int off, int end)
1985 * Unlike CRC32, CRC32C does not have any methods marked as native
1986 * CRC32C also uses an "end" variable instead of the length variable CRC32 uses
1987 */
generate_CRC32C_updateBytes_entry(AbstractInterpreter::MethodKind kind)1988 address TemplateInterpreterGenerator::generate_CRC32C_updateBytes_entry(AbstractInterpreter::MethodKind kind) {
1989
1990 if (UseCRC32CIntrinsics) {
1991 uint64_t entry_off = __ offset();
1992
1993 // We don't generate local frame and don't align stack because
1994 // we call stub code and there is no safepoint on this path.
1995
1996 // Load parameters.
1997 // Z_esp is callers operand stack pointer, i.e. it points to the parameters.
1998 const Register argP = Z_esp;
1999 const Register crc = Z_ARG1; // crc value
2000 const Register data = Z_ARG2; // address of java byte array
2001 const Register dataLen = Z_ARG3; // source data len
2002 const Register table = Z_ARG4; // address of crc32 table
2003 const Register t0 = Z_R10; // work reg for kernel* emitters
2004 const Register t1 = Z_R11; // work reg for kernel* emitters
2005 const Register t2 = Z_R12; // work reg for kernel* emitters
2006 const Register t3 = Z_R13; // work reg for kernel* emitters
2007
2008 // Arguments are reversed on java expression stack.
2009 // Calculate address of start element.
2010 if (kind == Interpreter::java_util_zip_CRC32C_updateDirectByteBuffer) { // Used for "updateByteBuffer direct".
2011 // crc @ (SP + 5W) (32bit)
2012 // buf @ (SP + 3W) (64bit ptr to long array)
2013 // off @ (SP + 2W) (32bit)
2014 // dataLen @ (SP + 1W) (32bit)
2015 // data = buf + off
2016 BLOCK_COMMENT("CRC32C_updateDirectByteBuffer {");
2017 __ z_llgf(crc, 5*wordSize, argP); // current crc state
2018 __ z_lg(data, 3*wordSize, argP); // start of byte buffer
2019 __ z_agf(data, 2*wordSize, argP); // Add byte buffer offset.
2020 __ z_lgf(dataLen, 1*wordSize, argP); // #bytes to process, calculated as
2021 __ z_sgf(dataLen, Address(argP, 2*wordSize)); // (end_index - offset)
2022 } else { // Used for "updateBytes update".
2023 // crc @ (SP + 4W) (32bit)
2024 // buf @ (SP + 3W) (64bit ptr to byte array)
2025 // off @ (SP + 2W) (32bit)
2026 // dataLen @ (SP + 1W) (32bit)
2027 // data = buf + off + base_offset
2028 BLOCK_COMMENT("CRC32C_updateBytes {");
2029 __ z_llgf(crc, 4*wordSize, argP); // current crc state
2030 __ z_lg(data, 3*wordSize, argP); // start of byte buffer
2031 __ z_agf(data, 2*wordSize, argP); // Add byte buffer offset.
2032 __ z_lgf(dataLen, 1*wordSize, argP); // #bytes to process, calculated as
2033 __ z_sgf(dataLen, Address(argP, 2*wordSize)); // (end_index - offset)
2034 __ z_aghi(data, arrayOopDesc::base_offset_in_bytes(T_BYTE));
2035 }
2036
2037 StubRoutines::zarch::generate_load_crc32c_table_addr(_masm, table);
2038
2039 __ resize_frame(-(6*8), Z_R0, true); // Resize frame to provide add'l space to spill 5 registers.
2040 __ z_stmg(t0, t3, 1*8, Z_SP); // Spill regs 10..13 to make them available as work registers.
2041 __ kernel_crc32_1word(crc, data, dataLen, table, t0, t1, t2, t3, false);
2042 __ z_lmg(t0, t3, 1*8, Z_SP); // Spill regs 10..13 back from stack.
2043
2044 // Restore caller sp for c2i case.
2045 __ resize_frame_absolute(Z_R10, Z_R0, true); // Cut the stack back to where the caller started.
2046
2047 __ z_br(Z_R14);
2048
2049 BLOCK_COMMENT("} CRC32C_update{Bytes|DirectByteBuffer}");
2050 return __ addr_at(entry_off);
2051 }
2052
2053 return NULL;
2054 }
2055
bang_stack_shadow_pages(bool native_call)2056 void TemplateInterpreterGenerator::bang_stack_shadow_pages(bool native_call) {
2057 // Quick & dirty stack overflow checking: bang the stack & handle trap.
2058 // Note that we do the banging after the frame is setup, since the exception
2059 // handling code expects to find a valid interpreter frame on the stack.
2060 // Doing the banging earlier fails if the caller frame is not an interpreter
2061 // frame.
2062 // (Also, the exception throwing code expects to unlock any synchronized
2063 // method receiver, so do the banging after locking the receiver.)
2064
2065 // Bang each page in the shadow zone. We can't assume it's been done for
2066 // an interpreter frame with greater than a page of locals, so each page
2067 // needs to be checked. Only true for non-native. For native, we only bang the last page.
2068 if (UseStackBanging) {
2069 const int page_size = os::vm_page_size();
2070 const int n_shadow_pages = (int)(JavaThread::stack_shadow_zone_size()/page_size);
2071 const int start_page_num = native_call ? n_shadow_pages : 1;
2072 for (int pages = start_page_num; pages <= n_shadow_pages; pages++) {
2073 __ bang_stack_with_offset(pages*page_size);
2074 }
2075 }
2076 }
2077
2078 //-----------------------------------------------------------------------------
2079 // Exceptions
2080
generate_throw_exception()2081 void TemplateInterpreterGenerator::generate_throw_exception() {
2082
2083 BLOCK_COMMENT("throw_exception {");
2084
2085 // Entry point in previous activation (i.e., if the caller was interpreted).
2086 Interpreter::_rethrow_exception_entry = __ pc();
2087 __ z_lg(Z_fp, _z_abi(callers_sp), Z_SP); // Frame accessors use Z_fp.
2088 // Z_ARG1 (==Z_tos): exception
2089 // Z_ARG2 : Return address/pc that threw exception.
2090 __ restore_bcp(); // R13 points to call/send.
2091 __ restore_locals();
2092
2093 // Fallthrough, no need to restore Z_esp.
2094
2095 // Entry point for exceptions thrown within interpreter code.
2096 Interpreter::_throw_exception_entry = __ pc();
2097 // Expression stack is undefined here.
2098 // Z_ARG1 (==Z_tos): exception
2099 // Z_bcp: exception bcp
2100 __ verify_oop(Z_ARG1);
2101 __ z_lgr(Z_ARG2, Z_ARG1);
2102
2103 // Expression stack must be empty before entering the VM in case of
2104 // an exception.
2105 __ empty_expression_stack();
2106 // Find exception handler address and preserve exception oop.
2107 const Register Rpreserved_exc_oop = Z_tmp_1;
2108 __ call_VM(Rpreserved_exc_oop,
2109 CAST_FROM_FN_PTR(address, InterpreterRuntime::exception_handler_for_exception),
2110 Z_ARG2);
2111 // Z_RET: exception handler entry point
2112 // Z_bcp: bcp for exception handler
2113 __ push_ptr(Rpreserved_exc_oop); // Push exception which is now the only value on the stack.
2114 __ z_br(Z_RET); // Jump to exception handler (may be _remove_activation_entry!).
2115
2116 // If the exception is not handled in the current frame the frame is
2117 // removed and the exception is rethrown (i.e. exception
2118 // continuation is _rethrow_exception).
2119 //
2120 // Note: At this point the bci is still the bci for the instruction
2121 // which caused the exception and the expression stack is
2122 // empty. Thus, for any VM calls at this point, GC will find a legal
2123 // oop map (with empty expression stack).
2124
2125 //
2126 // JVMTI PopFrame support
2127 //
2128
2129 Interpreter::_remove_activation_preserving_args_entry = __ pc();
2130 __ z_lg(Z_fp, _z_parent_ijava_frame_abi(callers_sp), Z_SP);
2131 __ empty_expression_stack();
2132 // Set the popframe_processing bit in pending_popframe_condition
2133 // indicating that we are currently handling popframe, so that
2134 // call_VMs that may happen later do not trigger new popframe
2135 // handling cycles.
2136 __ load_sized_value(Z_tmp_1, Address(Z_thread, JavaThread::popframe_condition_offset()), 4, false /*signed*/);
2137 __ z_oill(Z_tmp_1, JavaThread::popframe_processing_bit);
2138 __ z_sty(Z_tmp_1, thread_(popframe_condition));
2139
2140 {
2141 // Check to see whether we are returning to a deoptimized frame.
2142 // (The PopFrame call ensures that the caller of the popped frame is
2143 // either interpreted or compiled and deoptimizes it if compiled.)
2144 // In this case, we can't call dispatch_next() after the frame is
2145 // popped, but instead must save the incoming arguments and restore
2146 // them after deoptimization has occurred.
2147 //
2148 // Note that we don't compare the return PC against the
2149 // deoptimization blob's unpack entry because of the presence of
2150 // adapter frames in C2.
2151 NearLabel caller_not_deoptimized;
2152 __ z_lg(Z_ARG1, _z_parent_ijava_frame_abi(return_pc), Z_fp);
2153 __ call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::interpreter_contains), Z_ARG1);
2154 __ compareU64_and_branch(Z_RET, (intptr_t)0, Assembler::bcondNotEqual, caller_not_deoptimized);
2155
2156 // Compute size of arguments for saving when returning to
2157 // deoptimized caller.
2158 __ get_method(Z_ARG2);
2159 __ z_lg(Z_ARG2, Address(Z_ARG2, Method::const_offset()));
2160 __ z_llgh(Z_ARG2, Address(Z_ARG2, ConstMethod::size_of_parameters_offset()));
2161 __ z_sllg(Z_ARG2, Z_ARG2, Interpreter::logStackElementSize); // slots 2 bytes
2162 __ restore_locals();
2163 // Compute address of args to be saved.
2164 __ z_lgr(Z_ARG3, Z_locals);
2165 __ z_slgr(Z_ARG3, Z_ARG2);
2166 __ add2reg(Z_ARG3, wordSize);
2167 // Save these arguments.
2168 __ call_VM_leaf(CAST_FROM_FN_PTR(address, Deoptimization::popframe_preserve_args),
2169 Z_thread, Z_ARG2, Z_ARG3);
2170
2171 __ remove_activation(vtos, Z_R14,
2172 /* throw_monitor_exception */ false,
2173 /* install_monitor_exception */ false,
2174 /* notify_jvmdi */ false);
2175
2176 // Inform deoptimization that it is responsible for restoring
2177 // these arguments.
2178 __ store_const(thread_(popframe_condition),
2179 JavaThread::popframe_force_deopt_reexecution_bit,
2180 Z_tmp_1, false);
2181
2182 // Continue in deoptimization handler.
2183 __ z_br(Z_R14);
2184
2185 __ bind(caller_not_deoptimized);
2186 }
2187
2188 // Clear the popframe condition flag.
2189 __ clear_mem(thread_(popframe_condition), sizeof(int));
2190
2191 __ remove_activation(vtos,
2192 noreg, // Retaddr is not used.
2193 false, // throw_monitor_exception
2194 false, // install_monitor_exception
2195 false); // notify_jvmdi
2196 __ z_lg(Z_fp, _z_abi(callers_sp), Z_SP); // Restore frame pointer.
2197 __ restore_bcp();
2198 __ restore_locals();
2199 __ restore_esp();
2200 // The method data pointer was incremented already during
2201 // call profiling. We have to restore the mdp for the current bcp.
2202 if (ProfileInterpreter) {
2203 __ set_method_data_pointer_for_bcp();
2204 }
2205 #if INCLUDE_JVMTI
2206 {
2207 Label L_done;
2208
2209 __ z_cli(0, Z_bcp, Bytecodes::_invokestatic);
2210 __ z_brc(Assembler::bcondNotEqual, L_done);
2211
2212 // The member name argument must be restored if _invokestatic is
2213 // re-executed after a PopFrame call. Detect such a case in the
2214 // InterpreterRuntime function and return the member name
2215 // argument, or NULL.
2216 __ z_lg(Z_ARG2, Address(Z_locals));
2217 __ get_method(Z_ARG3);
2218 __ call_VM(Z_tmp_1,
2219 CAST_FROM_FN_PTR(address, InterpreterRuntime::member_name_arg_or_null),
2220 Z_ARG2, Z_ARG3, Z_bcp);
2221
2222 __ z_ltgr(Z_tmp_1, Z_tmp_1);
2223 __ z_brc(Assembler::bcondEqual, L_done);
2224
2225 __ z_stg(Z_tmp_1, Address(Z_esp, wordSize));
2226 __ bind(L_done);
2227 }
2228 #endif // INCLUDE_JVMTI
2229 __ dispatch_next(vtos);
2230 // End of PopFrame support.
2231 Interpreter::_remove_activation_entry = __ pc();
2232
2233 // In between activations - previous activation type unknown yet
2234 // compute continuation point - the continuation point expects the
2235 // following registers set up:
2236 //
2237 // Z_ARG1 (==Z_tos): exception
2238 // Z_ARG2 : return address/pc that threw exception
2239
2240 Register return_pc = Z_tmp_1;
2241 Register handler = Z_tmp_2;
2242 assert(return_pc->is_nonvolatile(), "use non-volatile reg. to preserve exception pc");
2243 assert(handler->is_nonvolatile(), "use non-volatile reg. to handler pc");
2244 __ asm_assert_ijava_state_magic(return_pc/*tmp*/); // The top frame should be an interpreter frame.
2245 __ z_lg(return_pc, _z_parent_ijava_frame_abi(return_pc), Z_fp);
2246
2247 // Moved removing the activation after VM call, because the new top
2248 // frame does not necessarily have the z_abi_160 required for a VM
2249 // call (e.g. if it is compiled).
2250
2251 __ super_call_VM_leaf(CAST_FROM_FN_PTR(address,
2252 SharedRuntime::exception_handler_for_return_address),
2253 Z_thread, return_pc);
2254 __ z_lgr(handler, Z_RET); // Save exception handler.
2255
2256 // Preserve exception over this code sequence.
2257 __ pop_ptr(Z_ARG1);
2258 __ set_vm_result(Z_ARG1);
2259 // Remove the activation (without doing throws on illegalMonitorExceptions).
2260 __ remove_activation(vtos, noreg/*ret.pc already loaded*/, false/*throw exc*/, true/*install exc*/, false/*notify jvmti*/);
2261 __ z_lg(Z_fp, _z_abi(callers_sp), Z_SP); // Restore frame pointer.
2262
2263 __ get_vm_result(Z_ARG1); // Restore exception.
2264 __ verify_oop(Z_ARG1);
2265 __ z_lgr(Z_ARG2, return_pc); // Restore return address.
2266
2267 #ifdef ASSERT
2268 // The return_pc in the new top frame is dead... at least that's my
2269 // current understanding. To assert this I overwrite it.
2270 // Note: for compiled frames the handler is the deopt blob
2271 // which writes Z_ARG2 into the return_pc slot.
2272 __ load_const_optimized(return_pc, 0xb00b1);
2273 __ z_stg(return_pc, _z_parent_ijava_frame_abi(return_pc), Z_SP);
2274 #endif
2275
2276 // Z_ARG1 (==Z_tos): exception
2277 // Z_ARG2 : return address/pc that threw exception
2278
2279 // Note that an "issuing PC" is actually the next PC after the call.
2280 __ z_br(handler); // Jump to exception handler of caller.
2281
2282 BLOCK_COMMENT("} throw_exception");
2283 }
2284
2285 //
2286 // JVMTI ForceEarlyReturn support
2287 //
generate_earlyret_entry_for(TosState state)2288 address TemplateInterpreterGenerator::generate_earlyret_entry_for (TosState state) {
2289 address entry = __ pc();
2290
2291 BLOCK_COMMENT("earlyret_entry {");
2292
2293 __ z_lg(Z_fp, _z_parent_ijava_frame_abi(callers_sp), Z_SP);
2294 __ restore_bcp();
2295 __ restore_locals();
2296 __ restore_esp();
2297 __ empty_expression_stack();
2298 __ load_earlyret_value(state);
2299
2300 Register RjvmtiState = Z_tmp_1;
2301 __ z_lg(RjvmtiState, thread_(jvmti_thread_state));
2302 __ store_const(Address(RjvmtiState, JvmtiThreadState::earlyret_state_offset()),
2303 JvmtiThreadState::earlyret_inactive, 4, 4, Z_R0_scratch);
2304
2305 if (state == itos) {
2306 // Narrow result if state is itos but result type is smaller.
2307 // Need to narrow in the return bytecode rather than in generate_return_entry
2308 // since compiled code callers expect the result to already be narrowed.
2309 __ narrow(Z_tos, Z_tmp_1); /* fall through */
2310 }
2311 __ remove_activation(state,
2312 Z_tmp_1, // retaddr
2313 false, // throw_monitor_exception
2314 false, // install_monitor_exception
2315 true); // notify_jvmdi
2316 __ z_br(Z_tmp_1);
2317
2318 BLOCK_COMMENT("} earlyret_entry");
2319
2320 return entry;
2321 }
2322
2323 //-----------------------------------------------------------------------------
2324 // Helper for vtos entry point generation.
2325
set_vtos_entry_points(Template * t,address & bep,address & cep,address & sep,address & aep,address & iep,address & lep,address & fep,address & dep,address & vep)2326 void TemplateInterpreterGenerator::set_vtos_entry_points(Template* t,
2327 address& bep,
2328 address& cep,
2329 address& sep,
2330 address& aep,
2331 address& iep,
2332 address& lep,
2333 address& fep,
2334 address& dep,
2335 address& vep) {
2336 assert(t->is_valid() && t->tos_in() == vtos, "illegal template");
2337 Label L;
2338 aep = __ pc(); __ push_ptr(); __ z_bru(L);
2339 fep = __ pc(); __ push_f(); __ z_bru(L);
2340 dep = __ pc(); __ push_d(); __ z_bru(L);
2341 lep = __ pc(); __ push_l(); __ z_bru(L);
2342 bep = cep = sep =
2343 iep = __ pc(); __ push_i();
2344 vep = __ pc();
2345 __ bind(L);
2346 generate_and_dispatch(t);
2347 }
2348
2349 //-----------------------------------------------------------------------------
2350
2351 #ifndef PRODUCT
generate_trace_code(TosState state)2352 address TemplateInterpreterGenerator::generate_trace_code(TosState state) {
2353 address entry = __ pc();
2354 NearLabel counter_below_trace_threshold;
2355
2356 if (TraceBytecodesAt > 0) {
2357 // Skip runtime call, if the trace threshold is not yet reached.
2358 __ load_absolute_address(Z_tmp_1, (address)&BytecodeCounter::_counter_value);
2359 __ load_absolute_address(Z_tmp_2, (address)&TraceBytecodesAt);
2360 __ load_sized_value(Z_tmp_1, Address(Z_tmp_1), 4, false /*signed*/);
2361 __ load_sized_value(Z_tmp_2, Address(Z_tmp_2), 8, false /*signed*/);
2362 __ compareU64_and_branch(Z_tmp_1, Z_tmp_2, Assembler::bcondLow, counter_below_trace_threshold);
2363 }
2364
2365 int offset2 = state == ltos || state == dtos ? 2 : 1;
2366
2367 __ push(state);
2368 // Preserved return pointer is in Z_R14.
2369 // InterpreterRuntime::trace_bytecode() preserved and returns the value passed as second argument.
2370 __ z_lgr(Z_ARG2, Z_R14);
2371 __ z_lg(Z_ARG3, Address(Z_esp, Interpreter::expr_offset_in_bytes(0)));
2372 if (WizardMode) {
2373 __ z_lgr(Z_ARG4, Z_esp); // Trace Z_esp in WizardMode.
2374 } else {
2375 __ z_lg(Z_ARG4, Address(Z_esp, Interpreter::expr_offset_in_bytes(offset2)));
2376 }
2377 __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::trace_bytecode), Z_ARG2, Z_ARG3, Z_ARG4);
2378 __ z_lgr(Z_R14, Z_RET); // Estore return address (see above).
2379 __ pop(state);
2380
2381 __ bind(counter_below_trace_threshold);
2382 __ z_br(Z_R14); // return
2383
2384 return entry;
2385 }
2386
2387 // Make feasible for old CPUs.
count_bytecode()2388 void TemplateInterpreterGenerator::count_bytecode() {
2389 __ load_absolute_address(Z_R1_scratch, (address) &BytecodeCounter::_counter_value);
2390 __ add2mem_32(Address(Z_R1_scratch), 1, Z_R0_scratch);
2391 }
2392
histogram_bytecode(Template * t)2393 void TemplateInterpreterGenerator::histogram_bytecode(Template * t) {
2394 __ load_absolute_address(Z_R1_scratch, (address)&BytecodeHistogram::_counters[ t->bytecode() ]);
2395 __ add2mem_32(Address(Z_R1_scratch), 1, Z_tmp_1);
2396 }
2397
histogram_bytecode_pair(Template * t)2398 void TemplateInterpreterGenerator::histogram_bytecode_pair(Template * t) {
2399 Address index_addr(Z_tmp_1, (intptr_t) 0);
2400 Register index = Z_tmp_2;
2401
2402 // Load previous index.
2403 __ load_absolute_address(Z_tmp_1, (address) &BytecodePairHistogram::_index);
2404 __ mem2reg_opt(index, index_addr, false);
2405
2406 // Mask with current bytecode and store as new previous index.
2407 __ z_srl(index, BytecodePairHistogram::log2_number_of_codes);
2408 __ load_const_optimized(Z_R0_scratch,
2409 (int)t->bytecode() << BytecodePairHistogram::log2_number_of_codes);
2410 __ z_or(index, Z_R0_scratch);
2411 __ reg2mem_opt(index, index_addr, false);
2412
2413 // Load counter array's address.
2414 __ z_lgfr(index, index); // Sign extend for addressing.
2415 __ z_sllg(index, index, LogBytesPerInt); // index2bytes
2416 __ load_absolute_address(Z_R1_scratch,
2417 (address) &BytecodePairHistogram::_counters);
2418 // Add index and increment counter.
2419 __ z_agr(Z_R1_scratch, index);
2420 __ add2mem_32(Address(Z_R1_scratch), 1, Z_tmp_1);
2421 }
2422
trace_bytecode(Template * t)2423 void TemplateInterpreterGenerator::trace_bytecode(Template* t) {
2424 // Call a little run-time stub to avoid blow-up for each bytecode.
2425 // The run-time runtime saves the right registers, depending on
2426 // the tosca in-state for the given template.
2427 address entry = Interpreter::trace_code(t->tos_in());
2428 guarantee(entry != NULL, "entry must have been generated");
2429 __ call_stub(entry);
2430 }
2431
stop_interpreter_at()2432 void TemplateInterpreterGenerator::stop_interpreter_at() {
2433 NearLabel L;
2434
2435 __ load_absolute_address(Z_tmp_1, (address)&BytecodeCounter::_counter_value);
2436 __ load_absolute_address(Z_tmp_2, (address)&StopInterpreterAt);
2437 __ load_sized_value(Z_tmp_1, Address(Z_tmp_1), 4, false /*signed*/);
2438 __ load_sized_value(Z_tmp_2, Address(Z_tmp_2), 8, false /*signed*/);
2439 __ compareU64_and_branch(Z_tmp_1, Z_tmp_2, Assembler::bcondLow, L);
2440 assert(Z_tmp_1->is_nonvolatile(), "must be nonvolatile to preserve Z_tos");
2441 assert(Z_F8->is_nonvolatile(), "must be nonvolatile to preserve Z_ftos");
2442 __ z_lgr(Z_tmp_1, Z_tos); // Save tos.
2443 __ z_lgr(Z_tmp_2, Z_bytecode); // Save Z_bytecode.
2444 __ z_ldr(Z_F8, Z_ftos); // Save ftos.
2445 // Use -XX:StopInterpreterAt=<num> to set the limit
2446 // and break at breakpoint().
2447 __ call_VM(noreg, CAST_FROM_FN_PTR(address, breakpoint), false);
2448 __ z_lgr(Z_tos, Z_tmp_1); // Restore tos.
2449 __ z_lgr(Z_bytecode, Z_tmp_2); // Save Z_bytecode.
2450 __ z_ldr(Z_ftos, Z_F8); // Restore ftos.
2451 __ bind(L);
2452 }
2453
2454 #endif // !PRODUCT
2455