1 /*
2 * Copyright (c) 2014, 2016, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2015, 2016 SAP SE. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 #include "precompiled.hpp"
27 #include "asm/macroAssembler.inline.hpp"
28 #include "interpreter/bytecodeHistogram.hpp"
29 #include "interpreter/interpreter.hpp"
30 #include "interpreter/interpreterRuntime.hpp"
31 #include "interpreter/interp_masm.hpp"
32 #include "interpreter/templateInterpreterGenerator.hpp"
33 #include "interpreter/templateTable.hpp"
34 #include "oops/arrayOop.hpp"
35 #include "oops/methodData.hpp"
36 #include "oops/method.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 #include "utilities/macros.hpp"
50
51 #undef __
52 #define __ _masm->
53
54 // Size of interpreter code. Increase if too small. Interpreter will
55 // fail with a guarantee ("not enough space for interpreter generation");
56 // if too small.
57 // Run with +PrintInterpreter to get the VM to print out the size.
58 // Max size with JVMTI
59 int TemplateInterpreter::InterpreterCodeSize = 230*K;
60
61 #ifdef PRODUCT
62 #define BLOCK_COMMENT(str) /* nothing */
63 #else
64 #define BLOCK_COMMENT(str) __ block_comment(str)
65 #endif
66
67 #define BIND(label) __ bind(label); BLOCK_COMMENT(#label ":")
68
69 //-----------------------------------------------------------------------------
70
71 address TemplateInterpreterGenerator::generate_slow_signature_handler() {
72 // Slow_signature handler that respects the PPC C calling conventions.
73 //
74 // We get called by the native entry code with our output register
75 // area == 8. First we call InterpreterRuntime::get_result_handler
76 // to copy the pointer to the signature string temporarily to the
77 // first C-argument and to return the result_handler in
78 // R3_RET. Since native_entry will copy the jni-pointer to the
79 // first C-argument slot later on, it is OK to occupy this slot
80 // temporarilly. Then we copy the argument list on the java
81 // expression stack into native varargs format on the native stack
82 // and load arguments into argument registers. Integer arguments in
83 // the varargs vector will be sign-extended to 8 bytes.
84 //
85 // On entry:
86 // R3_ARG1 - intptr_t* Address of java argument list in memory.
87 // R15_prev_state - BytecodeInterpreter* Address of interpreter state for
88 // this method
89 // R19_method
90 //
91 // On exit (just before return instruction):
92 // R3_RET - contains the address of the result_handler.
93 // R4_ARG2 - is not updated for static methods and contains "this" otherwise.
94 // R5_ARG3-R10_ARG8: - When the (i-2)th Java argument is not of type float or double,
95 // ARGi contains this argument. Otherwise, ARGi is not updated.
96 // F1_ARG1-F13_ARG13 - contain the first 13 arguments of type float or double.
97
98 const int LogSizeOfTwoInstructions = 3;
99
100 // FIXME: use Argument:: GL: Argument names different numbers!
101 const int max_fp_register_arguments = 13;
102 const int max_int_register_arguments = 6; // first 2 are reserved
103
104 const Register arg_java = R21_tmp1;
105 const Register arg_c = R22_tmp2;
106 const Register signature = R23_tmp3; // is string
107 const Register sig_byte = R24_tmp4;
108 const Register fpcnt = R25_tmp5;
109 const Register argcnt = R26_tmp6;
110 const Register intSlot = R27_tmp7;
111 const Register target_sp = R28_tmp8;
112 const FloatRegister floatSlot = F0;
113
114 address entry = __ function_entry();
115
116 __ save_LR_CR(R0);
117 __ save_nonvolatile_gprs(R1_SP, _spill_nonvolatiles_neg(r14));
118 // We use target_sp for storing arguments in the C frame.
119 __ mr(target_sp, R1_SP);
120 __ push_frame_reg_args_nonvolatiles(0, R11_scratch1);
121
122 __ mr(arg_java, R3_ARG1);
123
124 __ call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::get_signature), R16_thread, R19_method);
125
126 // Signature is in R3_RET. Signature is callee saved.
127 __ mr(signature, R3_RET);
128
129 // Get the result handler.
130 __ call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::get_result_handler), R16_thread, R19_method);
131
132 {
133 Label L;
134 // test if static
135 // _access_flags._flags must be at offset 0.
136 // TODO PPC port: requires change in shared code.
137 //assert(in_bytes(AccessFlags::flags_offset()) == 0,
138 // "MethodDesc._access_flags == MethodDesc._access_flags._flags");
139 // _access_flags must be a 32 bit value.
140 assert(sizeof(AccessFlags) == 4, "wrong size");
141 __ lwa(R11_scratch1/*access_flags*/, method_(access_flags));
142 // testbit with condition register.
143 __ testbitdi(CCR0, R0, R11_scratch1/*access_flags*/, JVM_ACC_STATIC_BIT);
144 __ btrue(CCR0, L);
145 // For non-static functions, pass "this" in R4_ARG2 and copy it
146 // to 2nd C-arg slot.
147 // We need to box the Java object here, so we use arg_java
148 // (address of current Java stack slot) as argument and don't
149 // dereference it as in case of ints, floats, etc.
150 __ mr(R4_ARG2, arg_java);
151 __ addi(arg_java, arg_java, -BytesPerWord);
152 __ std(R4_ARG2, _abi(carg_2), target_sp);
153 __ bind(L);
154 }
155
156 // Will be incremented directly after loop_start. argcnt=0
157 // corresponds to 3rd C argument.
158 __ li(argcnt, -1);
159 // arg_c points to 3rd C argument
160 __ addi(arg_c, target_sp, _abi(carg_3));
161 // no floating-point args parsed so far
162 __ li(fpcnt, 0);
163
164 Label move_intSlot_to_ARG, move_floatSlot_to_FARG;
165 Label loop_start, loop_end;
166 Label do_int, do_long, do_float, do_double, do_dontreachhere, do_object, do_array, do_boxed;
167
168 // signature points to '(' at entry
169 #ifdef ASSERT
170 __ lbz(sig_byte, 0, signature);
171 __ cmplwi(CCR0, sig_byte, '(');
172 __ bne(CCR0, do_dontreachhere);
173 #endif
174
175 __ bind(loop_start);
176
177 __ addi(argcnt, argcnt, 1);
178 __ lbzu(sig_byte, 1, signature);
179
180 __ cmplwi(CCR0, sig_byte, ')'); // end of signature
181 __ beq(CCR0, loop_end);
182
183 __ cmplwi(CCR0, sig_byte, 'B'); // byte
184 __ beq(CCR0, do_int);
185
186 __ cmplwi(CCR0, sig_byte, 'C'); // char
187 __ beq(CCR0, do_int);
188
189 __ cmplwi(CCR0, sig_byte, 'D'); // double
190 __ beq(CCR0, do_double);
191
192 __ cmplwi(CCR0, sig_byte, 'F'); // float
193 __ beq(CCR0, do_float);
194
195 __ cmplwi(CCR0, sig_byte, 'I'); // int
196 __ beq(CCR0, do_int);
197
198 __ cmplwi(CCR0, sig_byte, 'J'); // long
199 __ beq(CCR0, do_long);
200
201 __ cmplwi(CCR0, sig_byte, 'S'); // short
202 __ beq(CCR0, do_int);
203
204 __ cmplwi(CCR0, sig_byte, 'Z'); // boolean
205 __ beq(CCR0, do_int);
206
207 __ cmplwi(CCR0, sig_byte, 'L'); // object
208 __ beq(CCR0, do_object);
209
210 __ cmplwi(CCR0, sig_byte, '['); // array
211 __ beq(CCR0, do_array);
212
213 // __ cmplwi(CCR0, sig_byte, 'V'); // void cannot appear since we do not parse the return type
214 // __ beq(CCR0, do_void);
215
216 __ bind(do_dontreachhere);
217
218 __ unimplemented("ShouldNotReachHere in slow_signature_handler", 120);
219
220 __ bind(do_array);
221
222 {
223 Label start_skip, end_skip;
224
225 __ bind(start_skip);
226 __ lbzu(sig_byte, 1, signature);
227 __ cmplwi(CCR0, sig_byte, '[');
228 __ beq(CCR0, start_skip); // skip further brackets
229 __ cmplwi(CCR0, sig_byte, '9');
230 __ bgt(CCR0, end_skip); // no optional size
231 __ cmplwi(CCR0, sig_byte, '0');
232 __ bge(CCR0, start_skip); // skip optional size
233 __ bind(end_skip);
234
235 __ cmplwi(CCR0, sig_byte, 'L');
236 __ beq(CCR0, do_object); // for arrays of objects, the name of the object must be skipped
237 __ b(do_boxed); // otherwise, go directly to do_boxed
238 }
239
240 __ bind(do_object);
241 {
242 Label L;
243 __ bind(L);
244 __ lbzu(sig_byte, 1, signature);
245 __ cmplwi(CCR0, sig_byte, ';');
246 __ bne(CCR0, L);
247 }
248 // Need to box the Java object here, so we use arg_java (address of
249 // current Java stack slot) as argument and don't dereference it as
250 // in case of ints, floats, etc.
251 Label do_null;
252 __ bind(do_boxed);
253 __ ld(R0,0, arg_java);
254 __ cmpdi(CCR0, R0, 0);
255 __ li(intSlot,0);
256 __ beq(CCR0, do_null);
257 __ mr(intSlot, arg_java);
258 __ bind(do_null);
259 __ std(intSlot, 0, arg_c);
260 __ addi(arg_java, arg_java, -BytesPerWord);
261 __ addi(arg_c, arg_c, BytesPerWord);
262 __ cmplwi(CCR0, argcnt, max_int_register_arguments);
263 __ blt(CCR0, move_intSlot_to_ARG);
264 __ b(loop_start);
265
266 __ bind(do_int);
267 __ lwa(intSlot, 0, arg_java);
268 __ std(intSlot, 0, arg_c);
269 __ addi(arg_java, arg_java, -BytesPerWord);
270 __ addi(arg_c, arg_c, BytesPerWord);
271 __ cmplwi(CCR0, argcnt, max_int_register_arguments);
272 __ blt(CCR0, move_intSlot_to_ARG);
273 __ b(loop_start);
274
275 __ bind(do_long);
276 __ ld(intSlot, -BytesPerWord, arg_java);
277 __ std(intSlot, 0, arg_c);
278 __ addi(arg_java, arg_java, - 2 * BytesPerWord);
279 __ addi(arg_c, arg_c, BytesPerWord);
280 __ cmplwi(CCR0, argcnt, max_int_register_arguments);
281 __ blt(CCR0, move_intSlot_to_ARG);
282 __ b(loop_start);
283
284 __ bind(do_float);
285 __ lfs(floatSlot, 0, arg_java);
286 #if defined(LINUX)
287 // Linux uses ELF ABI. Both original ELF and ELFv2 ABIs have float
288 // in the least significant word of an argument slot.
289 #if defined(VM_LITTLE_ENDIAN)
290 __ stfs(floatSlot, 0, arg_c);
291 #else
292 __ stfs(floatSlot, 4, arg_c);
293 #endif
294 #elif defined(AIX)
295 // Although AIX runs on big endian CPU, float is in most significant
296 // word of an argument slot.
297 __ stfs(floatSlot, 0, arg_c);
298 #else
299 #error "unknown OS"
300 #endif
301 __ addi(arg_java, arg_java, -BytesPerWord);
302 __ addi(arg_c, arg_c, BytesPerWord);
303 __ cmplwi(CCR0, fpcnt, max_fp_register_arguments);
304 __ blt(CCR0, move_floatSlot_to_FARG);
305 __ b(loop_start);
306
307 __ bind(do_double);
308 __ lfd(floatSlot, - BytesPerWord, arg_java);
309 __ stfd(floatSlot, 0, arg_c);
310 __ addi(arg_java, arg_java, - 2 * BytesPerWord);
311 __ addi(arg_c, arg_c, BytesPerWord);
312 __ cmplwi(CCR0, fpcnt, max_fp_register_arguments);
313 __ blt(CCR0, move_floatSlot_to_FARG);
314 __ b(loop_start);
315
316 __ bind(loop_end);
317
318 __ pop_frame();
319 __ restore_nonvolatile_gprs(R1_SP, _spill_nonvolatiles_neg(r14));
320 __ restore_LR_CR(R0);
321
322 __ blr();
323
324 Label move_int_arg, move_float_arg;
325 __ bind(move_int_arg); // each case must consist of 2 instructions (otherwise adapt LogSizeOfTwoInstructions)
326 __ mr(R5_ARG3, intSlot); __ b(loop_start);
327 __ mr(R6_ARG4, intSlot); __ b(loop_start);
328 __ mr(R7_ARG5, intSlot); __ b(loop_start);
329 __ mr(R8_ARG6, intSlot); __ b(loop_start);
330 __ mr(R9_ARG7, intSlot); __ b(loop_start);
331 __ mr(R10_ARG8, intSlot); __ b(loop_start);
332
333 __ bind(move_float_arg); // each case must consist of 2 instructions (otherwise adapt LogSizeOfTwoInstructions)
334 __ fmr(F1_ARG1, floatSlot); __ b(loop_start);
335 __ fmr(F2_ARG2, floatSlot); __ b(loop_start);
336 __ fmr(F3_ARG3, floatSlot); __ b(loop_start);
337 __ fmr(F4_ARG4, floatSlot); __ b(loop_start);
338 __ fmr(F5_ARG5, floatSlot); __ b(loop_start);
339 __ fmr(F6_ARG6, floatSlot); __ b(loop_start);
340 __ fmr(F7_ARG7, floatSlot); __ b(loop_start);
341 __ fmr(F8_ARG8, floatSlot); __ b(loop_start);
342 __ fmr(F9_ARG9, floatSlot); __ b(loop_start);
343 __ fmr(F10_ARG10, floatSlot); __ b(loop_start);
344 __ fmr(F11_ARG11, floatSlot); __ b(loop_start);
345 __ fmr(F12_ARG12, floatSlot); __ b(loop_start);
346 __ fmr(F13_ARG13, floatSlot); __ b(loop_start);
347
348 __ bind(move_intSlot_to_ARG);
349 __ sldi(R0, argcnt, LogSizeOfTwoInstructions);
350 __ load_const(R11_scratch1, move_int_arg); // Label must be bound here.
351 __ add(R11_scratch1, R0, R11_scratch1);
352 __ mtctr(R11_scratch1/*branch_target*/);
353 __ bctr();
354 __ bind(move_floatSlot_to_FARG);
355 __ sldi(R0, fpcnt, LogSizeOfTwoInstructions);
356 __ addi(fpcnt, fpcnt, 1);
357 __ load_const(R11_scratch1, move_float_arg); // Label must be bound here.
358 __ add(R11_scratch1, R0, R11_scratch1);
359 __ mtctr(R11_scratch1/*branch_target*/);
360 __ bctr();
361
362 return entry;
363 }
364
365 address TemplateInterpreterGenerator::generate_result_handler_for(BasicType type) {
366 //
367 // Registers alive
368 // R3_RET
369 // LR
370 //
371 // Registers updated
372 // R3_RET
373 //
374
375 Label done;
376 address entry = __ pc();
377
378 switch (type) {
379 case T_BOOLEAN:
380 // convert !=0 to 1
381 __ neg(R0, R3_RET);
382 __ orr(R0, R3_RET, R0);
383 __ srwi(R3_RET, R0, 31);
384 break;
385 case T_BYTE:
386 // sign extend 8 bits
387 __ extsb(R3_RET, R3_RET);
388 break;
389 case T_CHAR:
390 // zero extend 16 bits
391 __ clrldi(R3_RET, R3_RET, 48);
392 break;
393 case T_SHORT:
394 // sign extend 16 bits
395 __ extsh(R3_RET, R3_RET);
396 break;
397 case T_INT:
398 // sign extend 32 bits
399 __ extsw(R3_RET, R3_RET);
400 break;
401 case T_LONG:
402 break;
403 case T_OBJECT:
404 // unbox result if not null
405 __ cmpdi(CCR0, R3_RET, 0);
406 __ beq(CCR0, done);
407 __ ld(R3_RET, 0, R3_RET);
408 __ verify_oop(R3_RET);
409 break;
410 case T_FLOAT:
411 break;
412 case T_DOUBLE:
413 break;
414 case T_VOID:
415 break;
416 default: ShouldNotReachHere();
417 }
418
419 BIND(done);
420 __ blr();
421
422 return entry;
423 }
424
425 // Abstract method entry.
426 //
427 address TemplateInterpreterGenerator::generate_abstract_entry(void) {
428 address entry = __ pc();
429
430 //
431 // Registers alive
432 // R16_thread - JavaThread*
433 // R19_method - callee's method (method to be invoked)
434 // R1_SP - SP prepared such that caller's outgoing args are near top
435 // LR - return address to caller
436 //
437 // Stack layout at this point:
438 //
439 // 0 [TOP_IJAVA_FRAME_ABI] <-- R1_SP
440 // alignment (optional)
441 // [outgoing Java arguments]
442 // ...
443 // PARENT [PARENT_IJAVA_FRAME_ABI]
444 // ...
445 //
446
447 // Can't use call_VM here because we have not set up a new
448 // interpreter state. Make the call to the vm and make it look like
449 // our caller set up the JavaFrameAnchor.
450 __ set_top_ijava_frame_at_SP_as_last_Java_frame(R1_SP, R12_scratch2/*tmp*/);
451
452 // Push a new C frame and save LR.
453 __ save_LR_CR(R0);
454 __ push_frame_reg_args(0, R11_scratch1);
455
456 // This is not a leaf but we have a JavaFrameAnchor now and we will
457 // check (create) exceptions afterward so this is ok.
458 __ call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_AbstractMethodError),
459 R16_thread);
460
461 // Pop the C frame and restore LR.
462 __ pop_frame();
463 __ restore_LR_CR(R0);
464
465 // Reset JavaFrameAnchor from call_VM_leaf above.
466 __ reset_last_Java_frame();
467
468 // We don't know our caller, so jump to the general forward exception stub,
469 // which will also pop our full frame off. Satisfy the interface of
470 // SharedRuntime::generate_forward_exception()
471 __ load_const_optimized(R11_scratch1, StubRoutines::forward_exception_entry(), R0);
472 __ mtctr(R11_scratch1);
473 __ bctr();
474
475 return entry;
476 }
477
478 // Interpreter intrinsic for WeakReference.get().
479 // 1. Don't push a full blown frame and go on dispatching, but fetch the value
480 // into R8 and return quickly
481 // 2. If G1 is active we *must* execute this intrinsic for corrrectness:
482 // It contains a GC barrier which puts the reference into the satb buffer
483 // to indicate that someone holds a strong reference to the object the
484 // weak ref points to!
485 address TemplateInterpreterGenerator::generate_Reference_get_entry(void) {
486 // Code: _aload_0, _getfield, _areturn
487 // parameter size = 1
488 //
489 // The code that gets generated by this routine is split into 2 parts:
490 // 1. the "intrinsified" code for G1 (or any SATB based GC),
491 // 2. the slow path - which is an expansion of the regular method entry.
492 //
493 // Notes:
494 // * In the G1 code we do not check whether we need to block for
495 // a safepoint. If G1 is enabled then we must execute the specialized
496 // code for Reference.get (except when the Reference object is null)
497 // so that we can log the value in the referent field with an SATB
498 // update buffer.
499 // If the code for the getfield template is modified so that the
500 // G1 pre-barrier code is executed when the current method is
501 // Reference.get() then going through the normal method entry
502 // will be fine.
503 // * The G1 code can, however, check the receiver object (the instance
504 // of java.lang.Reference) and jump to the slow path if null. If the
505 // Reference object is null then we obviously cannot fetch the referent
506 // and so we don't need to call the G1 pre-barrier. Thus we can use the
507 // regular method entry code to generate the NPE.
508 //
509
510 if (UseG1GC) {
511 address entry = __ pc();
512
513 const int referent_offset = java_lang_ref_Reference::referent_offset;
514 guarantee(referent_offset > 0, "referent offset not initialized");
515
516 Label slow_path;
517
518 // Debugging not possible, so can't use __ skip_if_jvmti_mode(slow_path, GR31_SCRATCH);
519
520 // In the G1 code we don't check if we need to reach a safepoint. We
521 // continue and the thread will safepoint at the next bytecode dispatch.
522
523 // If the receiver is null then it is OK to jump to the slow path.
524 __ ld(R3_RET, Interpreter::stackElementSize, R15_esp); // get receiver
525
526 // Check if receiver == NULL and go the slow path.
527 __ cmpdi(CCR0, R3_RET, 0);
528 __ beq(CCR0, slow_path);
529
530 // Load the value of the referent field.
531 __ load_heap_oop(R3_RET, referent_offset, R3_RET);
532
533 // Generate the G1 pre-barrier code to log the value of
534 // the referent field in an SATB buffer. Note with
535 // these parameters the pre-barrier does not generate
536 // the load of the previous value.
537
538 // Restore caller sp for c2i case.
539 #ifdef ASSERT
540 __ ld(R9_ARG7, 0, R1_SP);
541 __ ld(R10_ARG8, 0, R21_sender_SP);
542 __ cmpd(CCR0, R9_ARG7, R10_ARG8);
543 __ asm_assert_eq("backlink", 0x544);
544 #endif // ASSERT
545 __ mr(R1_SP, R21_sender_SP); // Cut the stack back to where the caller started.
546
547 __ g1_write_barrier_pre(noreg, // obj
548 noreg, // offset
549 R3_RET, // pre_val
550 R11_scratch1, // tmp
551 R12_scratch2, // tmp
552 true); // needs_frame
553
554 __ blr();
555
556 // Generate regular method entry.
557 __ bind(slow_path);
558 __ jump_to_entry(Interpreter::entry_for_kind(Interpreter::zerolocals), R11_scratch1);
559 return entry;
560 }
561
562 return NULL;
563 }
564
565 address TemplateInterpreterGenerator::generate_StackOverflowError_handler() {
566 address entry = __ pc();
567
568 // Expression stack must be empty before entering the VM if an
569 // exception happened.
570 __ empty_expression_stack();
571 // Throw exception.
572 __ call_VM(noreg,
573 CAST_FROM_FN_PTR(address,
574 InterpreterRuntime::throw_StackOverflowError));
575 return entry;
576 }
577
578 address TemplateInterpreterGenerator::generate_ArrayIndexOutOfBounds_handler(const char* name) {
579 address entry = __ pc();
580 __ empty_expression_stack();
581 __ load_const_optimized(R4_ARG2, (address) name);
582 // Index is in R17_tos.
583 __ mr(R5_ARG3, R17_tos);
584 __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_ArrayIndexOutOfBoundsException));
585 return entry;
586 }
587
588 #if 0
589 // Call special ClassCastException constructor taking object to cast
590 // and target class as arguments.
591 address TemplateInterpreterGenerator::generate_ClassCastException_verbose_handler() {
592 address entry = __ pc();
593
594 // Expression stack must be empty before entering the VM if an
595 // exception happened.
596 __ empty_expression_stack();
597
598 // Thread will be loaded to R3_ARG1.
599 // Target class oop is in register R5_ARG3 by convention!
600 __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_ClassCastException_verbose), R17_tos, R5_ARG3);
601 // Above call must not return here since exception pending.
602 DEBUG_ONLY(__ should_not_reach_here();)
603 return entry;
604 }
605 #endif
606
607 address TemplateInterpreterGenerator::generate_ClassCastException_handler() {
608 address entry = __ pc();
609 // Expression stack must be empty before entering the VM if an
610 // exception happened.
611 __ empty_expression_stack();
612
613 // Load exception object.
614 // Thread will be loaded to R3_ARG1.
615 __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::throw_ClassCastException), R17_tos);
616 #ifdef ASSERT
617 // Above call must not return here since exception pending.
618 __ should_not_reach_here();
619 #endif
620 return entry;
621 }
622
623 address TemplateInterpreterGenerator::generate_exception_handler_common(const char* name, const char* message, bool pass_oop) {
624 address entry = __ pc();
625 //__ untested("generate_exception_handler_common");
626 Register Rexception = R17_tos;
627
628 // Expression stack must be empty before entering the VM if an exception happened.
629 __ empty_expression_stack();
630
631 __ load_const_optimized(R4_ARG2, (address) name, R11_scratch1);
632 if (pass_oop) {
633 __ mr(R5_ARG3, Rexception);
634 __ call_VM(Rexception, CAST_FROM_FN_PTR(address, InterpreterRuntime::create_klass_exception), false);
635 } else {
636 __ load_const_optimized(R5_ARG3, (address) message, R11_scratch1);
637 __ call_VM(Rexception, CAST_FROM_FN_PTR(address, InterpreterRuntime::create_exception), false);
638 }
639
640 // Throw exception.
641 __ mr(R3_ARG1, Rexception);
642 __ load_const_optimized(R11_scratch1, Interpreter::throw_exception_entry(), R12_scratch2);
643 __ mtctr(R11_scratch1);
644 __ bctr();
645
646 return entry;
647 }
648
649 address TemplateInterpreterGenerator::generate_continuation_for(TosState state) {
650 address entry = __ pc();
651 __ unimplemented("generate_continuation_for");
652 return entry;
653 }
654
655 // This entry is returned to when a call returns to the interpreter.
656 // When we arrive here, we expect that the callee stack frame is already popped.
657 address TemplateInterpreterGenerator::generate_return_entry_for(TosState state, int step, size_t index_size) {
658 address entry = __ pc();
659
660 // Move the value out of the return register back to the TOS cache of current frame.
661 switch (state) {
662 case ltos:
663 case btos:
664 case ztos:
665 case ctos:
666 case stos:
667 case atos:
668 case itos: __ mr(R17_tos, R3_RET); break; // RET -> TOS cache
669 case ftos:
670 case dtos: __ fmr(F15_ftos, F1_RET); break; // TOS cache -> GR_FRET
671 case vtos: break; // Nothing to do, this was a void return.
672 default : ShouldNotReachHere();
673 }
674
675 __ restore_interpreter_state(R11_scratch1); // Sets R11_scratch1 = fp.
676 __ ld(R12_scratch2, _ijava_state_neg(top_frame_sp), R11_scratch1);
677 __ resize_frame_absolute(R12_scratch2, R11_scratch1, R0);
678
679 // Compiled code destroys templateTableBase, reload.
680 __ load_const_optimized(R25_templateTableBase, (address)Interpreter::dispatch_table((TosState)0), R12_scratch2);
681
682 if (state == atos) {
683 __ profile_return_type(R3_RET, R11_scratch1, R12_scratch2);
684 }
685
686 const Register cache = R11_scratch1;
687 const Register size = R12_scratch2;
688 __ get_cache_and_index_at_bcp(cache, 1, index_size);
689
690 // Get least significant byte of 64 bit value:
691 #if defined(VM_LITTLE_ENDIAN)
692 __ lbz(size, in_bytes(ConstantPoolCache::base_offset() + ConstantPoolCacheEntry::flags_offset()), cache);
693 #else
694 __ lbz(size, in_bytes(ConstantPoolCache::base_offset() + ConstantPoolCacheEntry::flags_offset()) + 7, cache);
695 #endif
696 __ sldi(size, size, Interpreter::logStackElementSize);
697 __ add(R15_esp, R15_esp, size);
698 __ dispatch_next(state, step);
699 return entry;
700 }
701
702 address TemplateInterpreterGenerator::generate_deopt_entry_for(TosState state, int step) {
703 address entry = __ pc();
704 // If state != vtos, we're returning from a native method, which put it's result
705 // into the result register. So move the value out of the return register back
706 // to the TOS cache of current frame.
707
708 switch (state) {
709 case ltos:
710 case btos:
711 case ztos:
712 case ctos:
713 case stos:
714 case atos:
715 case itos: __ mr(R17_tos, R3_RET); break; // GR_RET -> TOS cache
716 case ftos:
717 case dtos: __ fmr(F15_ftos, F1_RET); break; // TOS cache -> GR_FRET
718 case vtos: break; // Nothing to do, this was a void return.
719 default : ShouldNotReachHere();
720 }
721
722 // Load LcpoolCache @@@ should be already set!
723 __ get_constant_pool_cache(R27_constPoolCache);
724
725 // Handle a pending exception, fall through if none.
726 __ check_and_forward_exception(R11_scratch1, R12_scratch2);
727
728 // Start executing bytecodes.
729 __ dispatch_next(state, step);
730
731 return entry;
732 }
733
734 address TemplateInterpreterGenerator::generate_safept_entry_for(TosState state, address runtime_entry) {
735 address entry = __ pc();
736
737 __ push(state);
738 __ call_VM(noreg, runtime_entry);
739 __ dispatch_via(vtos, Interpreter::_normal_table.table_for(vtos));
740
741 return entry;
742 }
743
744 // Helpers for commoning out cases in the various type of method entries.
745
746 // Increment invocation count & check for overflow.
747 //
748 // Note: checking for negative value instead of overflow
749 // so we have a 'sticky' overflow test.
750 //
751 void TemplateInterpreterGenerator::generate_counter_incr(Label* overflow, Label* profile_method, Label* profile_method_continue) {
752 // Note: In tiered we increment either counters in method or in MDO depending if we're profiling or not.
753 Register Rscratch1 = R11_scratch1;
754 Register Rscratch2 = R12_scratch2;
755 Register R3_counters = R3_ARG1;
756 Label done;
757
758 if (TieredCompilation) {
759 const int increment = InvocationCounter::count_increment;
760 Label no_mdo;
761 if (ProfileInterpreter) {
762 const Register Rmdo = R3_counters;
763 // If no method data exists, go to profile_continue.
764 __ ld(Rmdo, in_bytes(Method::method_data_offset()), R19_method);
765 __ cmpdi(CCR0, Rmdo, 0);
766 __ beq(CCR0, no_mdo);
767
768 // Increment invocation counter in the MDO.
769 const int mdo_ic_offs = in_bytes(MethodData::invocation_counter_offset()) + in_bytes(InvocationCounter::counter_offset());
770 __ lwz(Rscratch2, mdo_ic_offs, Rmdo);
771 __ lwz(Rscratch1, in_bytes(MethodData::invoke_mask_offset()), Rmdo);
772 __ addi(Rscratch2, Rscratch2, increment);
773 __ stw(Rscratch2, mdo_ic_offs, Rmdo);
774 __ and_(Rscratch1, Rscratch2, Rscratch1);
775 __ bne(CCR0, done);
776 __ b(*overflow);
777 }
778
779 // Increment counter in MethodCounters*.
780 const int mo_ic_offs = in_bytes(MethodCounters::invocation_counter_offset()) + in_bytes(InvocationCounter::counter_offset());
781 __ bind(no_mdo);
782 __ get_method_counters(R19_method, R3_counters, done);
783 __ lwz(Rscratch2, mo_ic_offs, R3_counters);
784 __ lwz(Rscratch1, in_bytes(MethodCounters::invoke_mask_offset()), R3_counters);
785 __ addi(Rscratch2, Rscratch2, increment);
786 __ stw(Rscratch2, mo_ic_offs, R3_counters);
787 __ and_(Rscratch1, Rscratch2, Rscratch1);
788 __ beq(CCR0, *overflow);
789
790 __ bind(done);
791
792 } else {
793
794 // Update standard invocation counters.
795 Register Rsum_ivc_bec = R4_ARG2;
796 __ get_method_counters(R19_method, R3_counters, done);
797 __ increment_invocation_counter(R3_counters, Rsum_ivc_bec, R12_scratch2);
798 // Increment interpreter invocation counter.
799 if (ProfileInterpreter) { // %%% Merge this into methodDataOop.
800 __ lwz(R12_scratch2, in_bytes(MethodCounters::interpreter_invocation_counter_offset()), R3_counters);
801 __ addi(R12_scratch2, R12_scratch2, 1);
802 __ stw(R12_scratch2, in_bytes(MethodCounters::interpreter_invocation_counter_offset()), R3_counters);
803 }
804 // Check if we must create a method data obj.
805 if (ProfileInterpreter && profile_method != NULL) {
806 const Register profile_limit = Rscratch1;
807 __ lwz(profile_limit, in_bytes(MethodCounters::interpreter_profile_limit_offset()), R3_counters);
808 // Test to see if we should create a method data oop.
809 __ cmpw(CCR0, Rsum_ivc_bec, profile_limit);
810 __ blt(CCR0, *profile_method_continue);
811 // If no method data exists, go to profile_method.
812 __ test_method_data_pointer(*profile_method);
813 }
814 // Finally check for counter overflow.
815 if (overflow) {
816 const Register invocation_limit = Rscratch1;
817 __ lwz(invocation_limit, in_bytes(MethodCounters::interpreter_invocation_limit_offset()), R3_counters);
818 __ cmpw(CCR0, Rsum_ivc_bec, invocation_limit);
819 __ bge(CCR0, *overflow);
820 }
821
822 __ bind(done);
823 }
824 }
825
826 // Generate code to initiate compilation on invocation counter overflow.
827 void TemplateInterpreterGenerator::generate_counter_overflow(Label& continue_entry) {
828 // Generate code to initiate compilation on the counter overflow.
829
830 // InterpreterRuntime::frequency_counter_overflow takes one arguments,
831 // which indicates if the counter overflow occurs at a backwards branch (NULL bcp)
832 // We pass zero in.
833 // The call returns the address of the verified entry point for the method or NULL
834 // if the compilation did not complete (either went background or bailed out).
835 //
836 // Unlike the C++ interpreter above: Check exceptions!
837 // Assumption: Caller must set the flag "do_not_unlock_if_sychronized" if the monitor of a sync'ed
838 // method has not yet been created. Thus, no unlocking of a non-existing monitor can occur.
839
840 __ li(R4_ARG2, 0);
841 __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::frequency_counter_overflow), R4_ARG2, true);
842
843 // Returns verified_entry_point or NULL.
844 // We ignore it in any case.
845 __ b(continue_entry);
846 }
847
848 // See if we've got enough room on the stack for locals plus overhead below
849 // JavaThread::stack_overflow_limit(). If not, throw a StackOverflowError
850 // without going through the signal handler, i.e., reserved and yellow zones
851 // will not be made usable. The shadow zone must suffice to handle the
852 // overflow.
853 //
854 // Kills Rmem_frame_size, Rscratch1.
855 void TemplateInterpreterGenerator::generate_stack_overflow_check(Register Rmem_frame_size, Register Rscratch1) {
856 Label done;
857 assert_different_registers(Rmem_frame_size, Rscratch1);
858
859 BLOCK_COMMENT("stack_overflow_check_with_compare {");
860 __ sub(Rmem_frame_size, R1_SP, Rmem_frame_size);
861 __ ld(Rscratch1, thread_(stack_overflow_limit));
862 __ cmpld(CCR0/*is_stack_overflow*/, Rmem_frame_size, Rscratch1);
863 __ bgt(CCR0/*is_stack_overflow*/, done);
864
865 // The stack overflows. Load target address of the runtime stub and call it.
866 assert(StubRoutines::throw_StackOverflowError_entry() != NULL, "generated in wrong order");
867 __ load_const_optimized(Rscratch1, (StubRoutines::throw_StackOverflowError_entry()), R0);
868 __ mtctr(Rscratch1);
869 // Restore caller_sp.
870 #ifdef ASSERT
871 __ ld(Rscratch1, 0, R1_SP);
872 __ ld(R0, 0, R21_sender_SP);
873 __ cmpd(CCR0, R0, Rscratch1);
874 __ asm_assert_eq("backlink", 0x547);
875 #endif // ASSERT
876 __ mr(R1_SP, R21_sender_SP);
877 __ bctr();
878
879 __ align(32, 12);
880 __ bind(done);
881 BLOCK_COMMENT("} stack_overflow_check_with_compare");
882 }
883
884 // Lock the current method, interpreter register window must be set up!
885 void TemplateInterpreterGenerator::lock_method(Register Rflags, Register Rscratch1, Register Rscratch2, bool flags_preloaded) {
886 const Register Robj_to_lock = Rscratch2;
887
888 {
889 if (!flags_preloaded) {
890 __ lwz(Rflags, method_(access_flags));
891 }
892
893 #ifdef ASSERT
894 // Check if methods needs synchronization.
895 {
896 Label Lok;
897 __ testbitdi(CCR0, R0, Rflags, JVM_ACC_SYNCHRONIZED_BIT);
898 __ btrue(CCR0,Lok);
899 __ stop("method doesn't need synchronization");
900 __ bind(Lok);
901 }
902 #endif // ASSERT
903 }
904
905 // Get synchronization object to Rscratch2.
906 {
907 Label Lstatic;
908 Label Ldone;
909
910 __ testbitdi(CCR0, R0, Rflags, JVM_ACC_STATIC_BIT);
911 __ btrue(CCR0, Lstatic);
912
913 // Non-static case: load receiver obj from stack and we're done.
914 __ ld(Robj_to_lock, R18_locals);
915 __ b(Ldone);
916
917 __ bind(Lstatic); // Static case: Lock the java mirror
918 // Load mirror from interpreter frame.
919 __ ld(Robj_to_lock, _abi(callers_sp), R1_SP);
920 __ ld(Robj_to_lock, _ijava_state_neg(mirror), Robj_to_lock);
921
922 __ bind(Ldone);
923 __ verify_oop(Robj_to_lock);
924 }
925
926 // Got the oop to lock => execute!
927 __ add_monitor_to_stack(true, Rscratch1, R0);
928
929 __ std(Robj_to_lock, BasicObjectLock::obj_offset_in_bytes(), R26_monitor);
930 __ lock_object(R26_monitor, Robj_to_lock);
931 }
932
933 // Generate a fixed interpreter frame for pure interpreter
934 // and I2N native transition frames.
935 //
936 // Before (stack grows downwards):
937 //
938 // | ... |
939 // |------------- |
940 // | java arg0 |
941 // | ... |
942 // | java argn |
943 // | | <- R15_esp
944 // | |
945 // |--------------|
946 // | abi_112 |
947 // | | <- R1_SP
948 // |==============|
949 //
950 //
951 // After:
952 //
953 // | ... |
954 // | java arg0 |<- R18_locals
955 // | ... |
956 // | java argn |
957 // |--------------|
958 // | |
959 // | java locals |
960 // | |
961 // |--------------|
962 // | abi_48 |
963 // |==============|
964 // | |
965 // | istate |
966 // | |
967 // |--------------|
968 // | monitor |<- R26_monitor
969 // |--------------|
970 // | |<- R15_esp
971 // | expression |
972 // | stack |
973 // | |
974 // |--------------|
975 // | |
976 // | abi_112 |<- R1_SP
977 // |==============|
978 //
979 // The top most frame needs an abi space of 112 bytes. This space is needed,
980 // since we call to c. The c function may spill their arguments to the caller
981 // frame. When we call to java, we don't need these spill slots. In order to save
982 // space on the stack, we resize the caller. However, java locals reside in
983 // the caller frame and the frame has to be increased. The frame_size for the
984 // current frame was calculated based on max_stack as size for the expression
985 // stack. At the call, just a part of the expression stack might be used.
986 // We don't want to waste this space and cut the frame back accordingly.
987 // The resulting amount for resizing is calculated as follows:
988 // resize = (number_of_locals - number_of_arguments) * slot_size
989 // + (R1_SP - R15_esp) + 48
990 //
991 // The size for the callee frame is calculated:
992 // framesize = 112 + max_stack + monitor + state_size
993 //
994 // maxstack: Max number of slots on the expression stack, loaded from the method.
995 // monitor: We statically reserve room for one monitor object.
996 // state_size: We save the current state of the interpreter to this area.
997 //
998 void TemplateInterpreterGenerator::generate_fixed_frame(bool native_call, Register Rsize_of_parameters, Register Rsize_of_locals) {
999 Register parent_frame_resize = R6_ARG4, // Frame will grow by this number of bytes.
1000 top_frame_size = R7_ARG5,
1001 Rconst_method = R8_ARG6;
1002
1003 assert_different_registers(Rsize_of_parameters, Rsize_of_locals, parent_frame_resize, top_frame_size);
1004
1005 __ ld(Rconst_method, method_(const));
1006 __ lhz(Rsize_of_parameters /* number of params */,
1007 in_bytes(ConstMethod::size_of_parameters_offset()), Rconst_method);
1008 if (native_call) {
1009 // If we're calling a native method, we reserve space for the worst-case signature
1010 // handler varargs vector, which is max(Argument::n_register_parameters, parameter_count+2).
1011 // We add two slots to the parameter_count, one for the jni
1012 // environment and one for a possible native mirror.
1013 Label skip_native_calculate_max_stack;
1014 __ addi(top_frame_size, Rsize_of_parameters, 2);
1015 __ cmpwi(CCR0, top_frame_size, Argument::n_register_parameters);
1016 __ bge(CCR0, skip_native_calculate_max_stack);
1017 __ li(top_frame_size, Argument::n_register_parameters);
1018 __ bind(skip_native_calculate_max_stack);
1019 __ sldi(Rsize_of_parameters, Rsize_of_parameters, Interpreter::logStackElementSize);
1020 __ sldi(top_frame_size, top_frame_size, Interpreter::logStackElementSize);
1021 __ sub(parent_frame_resize, R1_SP, R15_esp); // <0, off by Interpreter::stackElementSize!
1022 assert(Rsize_of_locals == noreg, "Rsize_of_locals not initialized"); // Only relevant value is Rsize_of_parameters.
1023 } else {
1024 __ lhz(Rsize_of_locals /* number of params */, in_bytes(ConstMethod::size_of_locals_offset()), Rconst_method);
1025 __ sldi(Rsize_of_parameters, Rsize_of_parameters, Interpreter::logStackElementSize);
1026 __ sldi(Rsize_of_locals, Rsize_of_locals, Interpreter::logStackElementSize);
1027 __ lhz(top_frame_size, in_bytes(ConstMethod::max_stack_offset()), Rconst_method);
1028 __ sub(R11_scratch1, Rsize_of_locals, Rsize_of_parameters); // >=0
1029 __ sub(parent_frame_resize, R1_SP, R15_esp); // <0, off by Interpreter::stackElementSize!
1030 __ sldi(top_frame_size, top_frame_size, Interpreter::logStackElementSize);
1031 __ add(parent_frame_resize, parent_frame_resize, R11_scratch1);
1032 }
1033
1034 // Compute top frame size.
1035 __ addi(top_frame_size, top_frame_size, frame::abi_reg_args_size + frame::ijava_state_size);
1036
1037 // Cut back area between esp and max_stack.
1038 __ addi(parent_frame_resize, parent_frame_resize, frame::abi_minframe_size - Interpreter::stackElementSize);
1039
1040 __ round_to(top_frame_size, frame::alignment_in_bytes);
1041 __ round_to(parent_frame_resize, frame::alignment_in_bytes);
1042 // parent_frame_resize = (locals-parameters) - (ESP-SP-ABI48) Rounded to frame alignment size.
1043 // Enlarge by locals-parameters (not in case of native_call), shrink by ESP-SP-ABI48.
1044
1045 if (!native_call) {
1046 // Stack overflow check.
1047 // Native calls don't need the stack size check since they have no
1048 // expression stack and the arguments are already on the stack and
1049 // we only add a handful of words to the stack.
1050 __ add(R11_scratch1, parent_frame_resize, top_frame_size);
1051 generate_stack_overflow_check(R11_scratch1, R12_scratch2);
1052 }
1053
1054 // Set up interpreter state registers.
1055
1056 __ add(R18_locals, R15_esp, Rsize_of_parameters);
1057 __ ld(R27_constPoolCache, in_bytes(ConstMethod::constants_offset()), Rconst_method);
1058 __ ld(R27_constPoolCache, ConstantPool::cache_offset_in_bytes(), R27_constPoolCache);
1059
1060 // Set method data pointer.
1061 if (ProfileInterpreter) {
1062 Label zero_continue;
1063 __ ld(R28_mdx, method_(method_data));
1064 __ cmpdi(CCR0, R28_mdx, 0);
1065 __ beq(CCR0, zero_continue);
1066 __ addi(R28_mdx, R28_mdx, in_bytes(MethodData::data_offset()));
1067 __ bind(zero_continue);
1068 }
1069
1070 if (native_call) {
1071 __ li(R14_bcp, 0); // Must initialize.
1072 } else {
1073 __ add(R14_bcp, in_bytes(ConstMethod::codes_offset()), Rconst_method);
1074 }
1075
1076 // Resize parent frame.
1077 __ mflr(R12_scratch2);
1078 __ neg(parent_frame_resize, parent_frame_resize);
1079 __ resize_frame(parent_frame_resize, R11_scratch1);
1080 __ std(R12_scratch2, _abi(lr), R1_SP);
1081
1082 // Get mirror and store it in the frame as GC root for this Method*.
1083 __ load_mirror_from_const_method(R12_scratch2, Rconst_method);
1084
1085 __ addi(R26_monitor, R1_SP, - frame::ijava_state_size);
1086 __ addi(R15_esp, R26_monitor, - Interpreter::stackElementSize);
1087
1088 // Store values.
1089 // R15_esp, R14_bcp, R26_monitor, R28_mdx are saved at java calls
1090 // in InterpreterMacroAssembler::call_from_interpreter.
1091 __ std(R19_method, _ijava_state_neg(method), R1_SP);
1092 __ std(R12_scratch2, _ijava_state_neg(mirror), R1_SP);
1093 __ std(R21_sender_SP, _ijava_state_neg(sender_sp), R1_SP);
1094 __ std(R27_constPoolCache, _ijava_state_neg(cpoolCache), R1_SP);
1095 __ std(R18_locals, _ijava_state_neg(locals), R1_SP);
1096
1097 // Note: esp, bcp, monitor, mdx live in registers. Hence, the correct version can only
1098 // be found in the frame after save_interpreter_state is done. This is always true
1099 // for non-top frames. But when a signal occurs, dumping the top frame can go wrong,
1100 // because e.g. frame::interpreter_frame_bcp() will not access the correct value
1101 // (Enhanced Stack Trace).
1102 // The signal handler does not save the interpreter state into the frame.
1103 __ li(R0, 0);
1104 #ifdef ASSERT
1105 // Fill remaining slots with constants.
1106 __ load_const_optimized(R11_scratch1, 0x5afe);
1107 __ load_const_optimized(R12_scratch2, 0xdead);
1108 #endif
1109 // We have to initialize some frame slots for native calls (accessed by GC).
1110 if (native_call) {
1111 __ std(R26_monitor, _ijava_state_neg(monitors), R1_SP);
1112 __ std(R14_bcp, _ijava_state_neg(bcp), R1_SP);
1113 if (ProfileInterpreter) { __ std(R28_mdx, _ijava_state_neg(mdx), R1_SP); }
1114 }
1115 #ifdef ASSERT
1116 else {
1117 __ std(R12_scratch2, _ijava_state_neg(monitors), R1_SP);
1118 __ std(R12_scratch2, _ijava_state_neg(bcp), R1_SP);
1119 __ std(R12_scratch2, _ijava_state_neg(mdx), R1_SP);
1120 }
1121 __ std(R11_scratch1, _ijava_state_neg(ijava_reserved), R1_SP);
1122 __ std(R12_scratch2, _ijava_state_neg(esp), R1_SP);
1123 __ std(R12_scratch2, _ijava_state_neg(lresult), R1_SP);
1124 __ std(R12_scratch2, _ijava_state_neg(fresult), R1_SP);
1125 #endif
1126 __ subf(R12_scratch2, top_frame_size, R1_SP);
1127 __ std(R0, _ijava_state_neg(oop_tmp), R1_SP);
1128 __ std(R12_scratch2, _ijava_state_neg(top_frame_sp), R1_SP);
1129
1130 // Push top frame.
1131 __ push_frame(top_frame_size, R11_scratch1);
1132 }
1133
1134 // End of helpers
1135
1136 address TemplateInterpreterGenerator::generate_math_entry(AbstractInterpreter::MethodKind kind) {
1137
1138 // Decide what to do: Use same platform specific instructions and runtime calls as compilers.
1139 bool use_instruction = false;
1140 address runtime_entry = NULL;
1141 int num_args = 1;
1142 bool double_precision = true;
1143
1144 // PPC64 specific:
1145 switch (kind) {
1146 case Interpreter::java_lang_math_sqrt: use_instruction = VM_Version::has_fsqrt(); break;
1147 case Interpreter::java_lang_math_abs: use_instruction = true; break;
1148 case Interpreter::java_lang_math_fmaF:
1149 case Interpreter::java_lang_math_fmaD: use_instruction = UseFMA; break;
1150 default: break; // Fall back to runtime call.
1151 }
1152
1153 switch (kind) {
1154 case Interpreter::java_lang_math_sin : runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dsin); break;
1155 case Interpreter::java_lang_math_cos : runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dcos); break;
1156 case Interpreter::java_lang_math_tan : runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dtan); break;
1157 case Interpreter::java_lang_math_abs : /* run interpreted */ break;
1158 case Interpreter::java_lang_math_sqrt : runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dsqrt); break;
1159 case Interpreter::java_lang_math_log : runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dlog); break;
1160 case Interpreter::java_lang_math_log10: runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dlog10); break;
1161 case Interpreter::java_lang_math_pow : runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dpow); num_args = 2; break;
1162 case Interpreter::java_lang_math_exp : runtime_entry = CAST_FROM_FN_PTR(address, SharedRuntime::dexp); break;
1163 case Interpreter::java_lang_math_fmaF : /* run interpreted */ num_args = 3; double_precision = false; break;
1164 case Interpreter::java_lang_math_fmaD : /* run interpreted */ num_args = 3; break;
1165 default: ShouldNotReachHere();
1166 }
1167
1168 // Use normal entry if neither instruction nor runtime call is used.
1169 if (!use_instruction && runtime_entry == NULL) return NULL;
1170
1171 address entry = __ pc();
1172
1173 // Load arguments
1174 assert(num_args <= 13, "passed in registers");
1175 if (double_precision) {
1176 int offset = (2 * num_args - 1) * Interpreter::stackElementSize;
1177 for (int i = 0; i < num_args; ++i) {
1178 __ lfd(as_FloatRegister(F1_ARG1->encoding() + i), offset, R15_esp);
1179 offset -= 2 * Interpreter::stackElementSize;
1180 }
1181 } else {
1182 int offset = num_args * Interpreter::stackElementSize;
1183 for (int i = 0; i < num_args; ++i) {
1184 __ lfs(as_FloatRegister(F1_ARG1->encoding() + i), offset, R15_esp);
1185 offset -= Interpreter::stackElementSize;
1186 }
1187 }
1188
1189 // Pop c2i arguments (if any) off when we return.
1190 #ifdef ASSERT
1191 __ ld(R9_ARG7, 0, R1_SP);
1192 __ ld(R10_ARG8, 0, R21_sender_SP);
1193 __ cmpd(CCR0, R9_ARG7, R10_ARG8);
1194 __ asm_assert_eq("backlink", 0x545);
1195 #endif // ASSERT
1196 __ mr(R1_SP, R21_sender_SP); // Cut the stack back to where the caller started.
1197
1198 if (use_instruction) {
1199 switch (kind) {
1200 case Interpreter::java_lang_math_sqrt: __ fsqrt(F1_RET, F1); break;
1201 case Interpreter::java_lang_math_abs: __ fabs(F1_RET, F1); break;
1202 case Interpreter::java_lang_math_fmaF: __ fmadds(F1_RET, F1, F2, F3); break;
1203 case Interpreter::java_lang_math_fmaD: __ fmadd(F1_RET, F1, F2, F3); break;
1204 default: ShouldNotReachHere();
1205 }
1206 } else {
1207 // Comment: Can use tail call if the unextended frame is always C ABI compliant:
1208 //__ load_const_optimized(R12_scratch2, runtime_entry, R0);
1209 //__ call_c_and_return_to_caller(R12_scratch2);
1210
1211 // Push a new C frame and save LR.
1212 __ save_LR_CR(R0);
1213 __ push_frame_reg_args(0, R11_scratch1);
1214
1215 __ call_VM_leaf(runtime_entry);
1216
1217 // Pop the C frame and restore LR.
1218 __ pop_frame();
1219 __ restore_LR_CR(R0);
1220 }
1221
1222 __ blr();
1223
1224 __ flush();
1225
1226 return entry;
1227 }
1228
1229 void TemplateInterpreterGenerator::bang_stack_shadow_pages(bool native_call) {
1230 // Quick & dirty stack overflow checking: bang the stack & handle trap.
1231 // Note that we do the banging after the frame is setup, since the exception
1232 // handling code expects to find a valid interpreter frame on the stack.
1233 // Doing the banging earlier fails if the caller frame is not an interpreter
1234 // frame.
1235 // (Also, the exception throwing code expects to unlock any synchronized
1236 // method receiever, so do the banging after locking the receiver.)
1237
1238 // Bang each page in the shadow zone. We can't assume it's been done for
1239 // an interpreter frame with greater than a page of locals, so each page
1240 // needs to be checked. Only true for non-native.
1241 if (UseStackBanging) {
1242 const int page_size = os::vm_page_size();
1243 const int n_shadow_pages = ((int)JavaThread::stack_shadow_zone_size()) / page_size;
1244 const int start_page = native_call ? n_shadow_pages : 1;
1245 BLOCK_COMMENT("bang_stack_shadow_pages:");
1246 for (int pages = start_page; pages <= n_shadow_pages; pages++) {
1247 __ bang_stack_with_offset(pages*page_size);
1248 }
1249 }
1250 }
1251
1252 // Interpreter stub for calling a native method. (asm interpreter)
1253 // This sets up a somewhat different looking stack for calling the
1254 // native method than the typical interpreter frame setup.
1255 //
1256 // On entry:
1257 // R19_method - method
1258 // R16_thread - JavaThread*
1259 // R15_esp - intptr_t* sender tos
1260 //
1261 // abstract stack (grows up)
1262 // [ IJava (caller of JNI callee) ] <-- ASP
1263 // ...
1264 address TemplateInterpreterGenerator::generate_native_entry(bool synchronized) {
1265
1266 address entry = __ pc();
1267
1268 const bool inc_counter = UseCompiler || CountCompiledCalls || LogTouchedMethods;
1269
1270 // -----------------------------------------------------------------------------
1271 // Allocate a new frame that represents the native callee (i2n frame).
1272 // This is not a full-blown interpreter frame, but in particular, the
1273 // following registers are valid after this:
1274 // - R19_method
1275 // - R18_local (points to start of arguments to native function)
1276 //
1277 // abstract stack (grows up)
1278 // [ IJava (caller of JNI callee) ] <-- ASP
1279 // ...
1280
1281 const Register signature_handler_fd = R11_scratch1;
1282 const Register pending_exception = R0;
1283 const Register result_handler_addr = R31;
1284 const Register native_method_fd = R11_scratch1;
1285 const Register access_flags = R22_tmp2;
1286 const Register active_handles = R11_scratch1; // R26_monitor saved to state.
1287 const Register sync_state = R12_scratch2;
1288 const Register sync_state_addr = sync_state; // Address is dead after use.
1289 const Register suspend_flags = R11_scratch1;
1290
1291 //=============================================================================
1292 // Allocate new frame and initialize interpreter state.
1293
1294 Label exception_return;
1295 Label exception_return_sync_check;
1296 Label stack_overflow_return;
1297
1298 // Generate new interpreter state and jump to stack_overflow_return in case of
1299 // a stack overflow.
1300 //generate_compute_interpreter_state(stack_overflow_return);
1301
1302 Register size_of_parameters = R22_tmp2;
1303
1304 generate_fixed_frame(true, size_of_parameters, noreg /* unused */);
1305
1306 //=============================================================================
1307 // Increment invocation counter. On overflow, entry to JNI method
1308 // will be compiled.
1309 Label invocation_counter_overflow, continue_after_compile;
1310 if (inc_counter) {
1311 if (synchronized) {
1312 // Since at this point in the method invocation the exception handler
1313 // would try to exit the monitor of synchronized methods which hasn't
1314 // been entered yet, we set the thread local variable
1315 // _do_not_unlock_if_synchronized to true. If any exception was thrown by
1316 // runtime, exception handling i.e. unlock_if_synchronized_method will
1317 // check this thread local flag.
1318 // This flag has two effects, one is to force an unwind in the topmost
1319 // interpreter frame and not perform an unlock while doing so.
1320 __ li(R0, 1);
1321 __ stb(R0, in_bytes(JavaThread::do_not_unlock_if_synchronized_offset()), R16_thread);
1322 }
1323 generate_counter_incr(&invocation_counter_overflow, NULL, NULL);
1324
1325 BIND(continue_after_compile);
1326 }
1327
1328 bang_stack_shadow_pages(true);
1329
1330 if (inc_counter) {
1331 // Reset the _do_not_unlock_if_synchronized flag.
1332 if (synchronized) {
1333 __ li(R0, 0);
1334 __ stb(R0, in_bytes(JavaThread::do_not_unlock_if_synchronized_offset()), R16_thread);
1335 }
1336 }
1337
1338 // access_flags = method->access_flags();
1339 // Load access flags.
1340 assert(access_flags->is_nonvolatile(),
1341 "access_flags must be in a non-volatile register");
1342 // Type check.
1343 assert(4 == sizeof(AccessFlags), "unexpected field size");
1344 __ lwz(access_flags, method_(access_flags));
1345
1346 // We don't want to reload R19_method and access_flags after calls
1347 // to some helper functions.
1348 assert(R19_method->is_nonvolatile(),
1349 "R19_method must be a non-volatile register");
1350
1351 // Check for synchronized methods. Must happen AFTER invocation counter
1352 // check, so method is not locked if counter overflows.
1353
1354 if (synchronized) {
1355 lock_method(access_flags, R11_scratch1, R12_scratch2, true);
1356
1357 // Update monitor in state.
1358 __ ld(R11_scratch1, 0, R1_SP);
1359 __ std(R26_monitor, _ijava_state_neg(monitors), R11_scratch1);
1360 }
1361
1362 // jvmti/jvmpi support
1363 __ notify_method_entry();
1364
1365 //=============================================================================
1366 // Get and call the signature handler.
1367
1368 __ ld(signature_handler_fd, method_(signature_handler));
1369 Label call_signature_handler;
1370
1371 __ cmpdi(CCR0, signature_handler_fd, 0);
1372 __ bne(CCR0, call_signature_handler);
1373
1374 // Method has never been called. Either generate a specialized
1375 // handler or point to the slow one.
1376 //
1377 // Pass parameter 'false' to avoid exception check in call_VM.
1378 __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::prepare_native_call), R19_method, false);
1379
1380 // Check for an exception while looking up the target method. If we
1381 // incurred one, bail.
1382 __ ld(pending_exception, thread_(pending_exception));
1383 __ cmpdi(CCR0, pending_exception, 0);
1384 __ bne(CCR0, exception_return_sync_check); // Has pending exception.
1385
1386 // Reload signature handler, it may have been created/assigned in the meanwhile.
1387 __ ld(signature_handler_fd, method_(signature_handler));
1388 __ twi_0(signature_handler_fd); // Order wrt. load of klass mirror and entry point (isync is below).
1389
1390 BIND(call_signature_handler);
1391
1392 // Before we call the signature handler we push a new frame to
1393 // protect the interpreter frame volatile registers when we return
1394 // from jni but before we can get back to Java.
1395
1396 // First set the frame anchor while the SP/FP registers are
1397 // convenient and the slow signature handler can use this same frame
1398 // anchor.
1399
1400 // We have a TOP_IJAVA_FRAME here, which belongs to us.
1401 __ set_top_ijava_frame_at_SP_as_last_Java_frame(R1_SP, R12_scratch2/*tmp*/);
1402
1403 // Now the interpreter frame (and its call chain) have been
1404 // invalidated and flushed. We are now protected against eager
1405 // being enabled in native code. Even if it goes eager the
1406 // registers will be reloaded as clean and we will invalidate after
1407 // the call so no spurious flush should be possible.
1408
1409 // Call signature handler and pass locals address.
1410 //
1411 // Our signature handlers copy required arguments to the C stack
1412 // (outgoing C args), R3_ARG1 to R10_ARG8, and FARG1 to FARG13.
1413 __ mr(R3_ARG1, R18_locals);
1414 #if !defined(ABI_ELFv2)
1415 __ ld(signature_handler_fd, 0, signature_handler_fd);
1416 #endif
1417
1418 __ call_stub(signature_handler_fd);
1419
1420 // Remove the register parameter varargs slots we allocated in
1421 // compute_interpreter_state. SP+16 ends up pointing to the ABI
1422 // outgoing argument area.
1423 //
1424 // Not needed on PPC64.
1425 //__ add(SP, SP, Argument::n_register_parameters*BytesPerWord);
1426
1427 assert(result_handler_addr->is_nonvolatile(), "result_handler_addr must be in a non-volatile register");
1428 // Save across call to native method.
1429 __ mr(result_handler_addr, R3_RET);
1430
1431 __ isync(); // Acquire signature handler before trying to fetch the native entry point and klass mirror.
1432
1433 // Set up fixed parameters and call the native method.
1434 // If the method is static, get mirror into R4_ARG2.
1435 {
1436 Label method_is_not_static;
1437 // Access_flags is non-volatile and still, no need to restore it.
1438
1439 // Restore access flags.
1440 __ testbitdi(CCR0, R0, access_flags, JVM_ACC_STATIC_BIT);
1441 __ bfalse(CCR0, method_is_not_static);
1442
1443 __ ld(R11_scratch1, _abi(callers_sp), R1_SP);
1444 // Load mirror from interpreter frame.
1445 __ ld(R12_scratch2, _ijava_state_neg(mirror), R11_scratch1);
1446 // R4_ARG2 = &state->_oop_temp;
1447 __ addi(R4_ARG2, R11_scratch1, _ijava_state_neg(oop_tmp));
1448 __ std(R12_scratch2/*mirror*/, _ijava_state_neg(oop_tmp), R11_scratch1);
1449 BIND(method_is_not_static);
1450 }
1451
1452 // At this point, arguments have been copied off the stack into
1453 // their JNI positions. Oops are boxed in-place on the stack, with
1454 // handles copied to arguments. The result handler address is in a
1455 // register.
1456
1457 // Pass JNIEnv address as first parameter.
1458 __ addir(R3_ARG1, thread_(jni_environment));
1459
1460 // Load the native_method entry before we change the thread state.
1461 __ ld(native_method_fd, method_(native_function));
1462
1463 //=============================================================================
1464 // Transition from _thread_in_Java to _thread_in_native. As soon as
1465 // we make this change the safepoint code needs to be certain that
1466 // the last Java frame we established is good. The pc in that frame
1467 // just needs to be near here not an actual return address.
1468
1469 // We use release_store_fence to update values like the thread state, where
1470 // we don't want the current thread to continue until all our prior memory
1471 // accesses (including the new thread state) are visible to other threads.
1472 __ li(R0, _thread_in_native);
1473 __ release();
1474
1475 // TODO PPC port assert(4 == JavaThread::sz_thread_state(), "unexpected field size");
1476 __ stw(R0, thread_(thread_state));
1477
1478 if (UseMembar) {
1479 __ fence();
1480 }
1481
1482 //=============================================================================
1483 // Call the native method. Argument registers must not have been
1484 // overwritten since "__ call_stub(signature_handler);" (except for
1485 // ARG1 and ARG2 for static methods).
1486 __ call_c(native_method_fd);
1487
1488 __ li(R0, 0);
1489 __ ld(R11_scratch1, 0, R1_SP);
1490 __ std(R3_RET, _ijava_state_neg(lresult), R11_scratch1);
1491 __ stfd(F1_RET, _ijava_state_neg(fresult), R11_scratch1);
1492 __ std(R0/*mirror*/, _ijava_state_neg(oop_tmp), R11_scratch1); // reset
1493
1494 // Note: C++ interpreter needs the following here:
1495 // The frame_manager_lr field, which we use for setting the last
1496 // java frame, gets overwritten by the signature handler. Restore
1497 // it now.
1498 //__ get_PC_trash_LR(R11_scratch1);
1499 //__ std(R11_scratch1, _top_ijava_frame_abi(frame_manager_lr), R1_SP);
1500
1501 // Because of GC R19_method may no longer be valid.
1502
1503 // Block, if necessary, before resuming in _thread_in_Java state.
1504 // In order for GC to work, don't clear the last_Java_sp until after
1505 // blocking.
1506
1507 //=============================================================================
1508 // Switch thread to "native transition" state before reading the
1509 // synchronization state. This additional state is necessary
1510 // because reading and testing the synchronization state is not
1511 // atomic w.r.t. GC, as this scenario demonstrates: Java thread A,
1512 // in _thread_in_native state, loads _not_synchronized and is
1513 // preempted. VM thread changes sync state to synchronizing and
1514 // suspends threads for GC. Thread A is resumed to finish this
1515 // native method, but doesn't block here since it didn't see any
1516 // synchronization in progress, and escapes.
1517
1518 // We use release_store_fence to update values like the thread state, where
1519 // we don't want the current thread to continue until all our prior memory
1520 // accesses (including the new thread state) are visible to other threads.
1521 __ li(R0/*thread_state*/, _thread_in_native_trans);
1522 __ release();
1523 __ stw(R0/*thread_state*/, thread_(thread_state));
1524 if (UseMembar) {
1525 __ fence();
1526 }
1527 // Write serialization page so that the VM thread can do a pseudo remote
1528 // membar. We use the current thread pointer to calculate a thread
1529 // specific offset to write to within the page. This minimizes bus
1530 // traffic due to cache line collision.
1531 else {
1532 __ serialize_memory(R16_thread, R11_scratch1, R12_scratch2);
1533 }
1534
1535 // Now before we return to java we must look for a current safepoint
1536 // (a new safepoint can not start since we entered native_trans).
1537 // We must check here because a current safepoint could be modifying
1538 // the callers registers right this moment.
1539
1540 // Acquire isn't strictly necessary here because of the fence, but
1541 // sync_state is declared to be volatile, so we do it anyway
1542 // (cmp-br-isync on one path, release (same as acquire on PPC64) on the other path).
1543 int sync_state_offs = __ load_const_optimized(sync_state_addr, SafepointSynchronize::address_of_state(), /*temp*/R0, true);
1544
1545 // TODO PPC port assert(4 == SafepointSynchronize::sz_state(), "unexpected field size");
1546 __ lwz(sync_state, sync_state_offs, sync_state_addr);
1547
1548 // TODO PPC port assert(4 == Thread::sz_suspend_flags(), "unexpected field size");
1549 __ lwz(suspend_flags, thread_(suspend_flags));
1550
1551 Label sync_check_done;
1552 Label do_safepoint;
1553 // No synchronization in progress nor yet synchronized.
1554 __ cmpwi(CCR0, sync_state, SafepointSynchronize::_not_synchronized);
1555 // Not suspended.
1556 __ cmpwi(CCR1, suspend_flags, 0);
1557
1558 __ bne(CCR0, do_safepoint);
1559 __ beq(CCR1, sync_check_done);
1560 __ bind(do_safepoint);
1561 __ isync();
1562 // Block. We do the call directly and leave the current
1563 // last_Java_frame setup undisturbed. We must save any possible
1564 // native result across the call. No oop is present.
1565
1566 __ mr(R3_ARG1, R16_thread);
1567 #if defined(ABI_ELFv2)
1568 __ call_c(CAST_FROM_FN_PTR(address, JavaThread::check_special_condition_for_native_trans),
1569 relocInfo::none);
1570 #else
1571 __ call_c(CAST_FROM_FN_PTR(FunctionDescriptor*, JavaThread::check_special_condition_for_native_trans),
1572 relocInfo::none);
1573 #endif
1574
1575 __ bind(sync_check_done);
1576
1577 //=============================================================================
1578 // <<<<<< Back in Interpreter Frame >>>>>
1579
1580 // We are in thread_in_native_trans here and back in the normal
1581 // interpreter frame. We don't have to do anything special about
1582 // safepoints and we can switch to Java mode anytime we are ready.
1583
1584 // Note: frame::interpreter_frame_result has a dependency on how the
1585 // method result is saved across the call to post_method_exit. For
1586 // native methods it assumes that the non-FPU/non-void result is
1587 // saved in _native_lresult and a FPU result in _native_fresult. If
1588 // this changes then the interpreter_frame_result implementation
1589 // will need to be updated too.
1590
1591 // On PPC64, we have stored the result directly after the native call.
1592
1593 //=============================================================================
1594 // Back in Java
1595
1596 // We use release_store_fence to update values like the thread state, where
1597 // we don't want the current thread to continue until all our prior memory
1598 // accesses (including the new thread state) are visible to other threads.
1599 __ li(R0/*thread_state*/, _thread_in_Java);
1600 __ release();
1601 __ stw(R0/*thread_state*/, thread_(thread_state));
1602 if (UseMembar) {
1603 __ fence();
1604 }
1605
1606 if (CheckJNICalls) {
1607 // clear_pending_jni_exception_check
1608 __ load_const_optimized(R0, 0L);
1609 __ st_ptr(R0, JavaThread::pending_jni_exception_check_fn_offset(), R16_thread);
1610 }
1611
1612 __ reset_last_Java_frame();
1613
1614 // Jvmdi/jvmpi support. Whether we've got an exception pending or
1615 // not, and whether unlocking throws an exception or not, we notify
1616 // on native method exit. If we do have an exception, we'll end up
1617 // in the caller's context to handle it, so if we don't do the
1618 // notify here, we'll drop it on the floor.
1619 __ notify_method_exit(true/*native method*/,
1620 ilgl /*illegal state (not used for native methods)*/,
1621 InterpreterMacroAssembler::NotifyJVMTI,
1622 false /*check_exceptions*/);
1623
1624 //=============================================================================
1625 // Handle exceptions
1626
1627 if (synchronized) {
1628 // Don't check for exceptions since we're still in the i2n frame. Do that
1629 // manually afterwards.
1630 __ unlock_object(R26_monitor, false); // Can also unlock methods.
1631 }
1632
1633 // Reset active handles after returning from native.
1634 // thread->active_handles()->clear();
1635 __ ld(active_handles, thread_(active_handles));
1636 // TODO PPC port assert(4 == JNIHandleBlock::top_size_in_bytes(), "unexpected field size");
1637 __ li(R0, 0);
1638 __ stw(R0, JNIHandleBlock::top_offset_in_bytes(), active_handles);
1639
1640 Label exception_return_sync_check_already_unlocked;
1641 __ ld(R0/*pending_exception*/, thread_(pending_exception));
1642 __ cmpdi(CCR0, R0/*pending_exception*/, 0);
1643 __ bne(CCR0, exception_return_sync_check_already_unlocked);
1644
1645 //-----------------------------------------------------------------------------
1646 // No exception pending.
1647
1648 // Move native method result back into proper registers and return.
1649 // Invoke result handler (may unbox/promote).
1650 __ ld(R11_scratch1, 0, R1_SP);
1651 __ ld(R3_RET, _ijava_state_neg(lresult), R11_scratch1);
1652 __ lfd(F1_RET, _ijava_state_neg(fresult), R11_scratch1);
1653 __ call_stub(result_handler_addr);
1654
1655 __ merge_frames(/*top_frame_sp*/ R21_sender_SP, /*return_pc*/ R0, R11_scratch1, R12_scratch2);
1656
1657 // Must use the return pc which was loaded from the caller's frame
1658 // as the VM uses return-pc-patching for deoptimization.
1659 __ mtlr(R0);
1660 __ blr();
1661
1662 //-----------------------------------------------------------------------------
1663 // An exception is pending. We call into the runtime only if the
1664 // caller was not interpreted. If it was interpreted the
1665 // interpreter will do the correct thing. If it isn't interpreted
1666 // (call stub/compiled code) we will change our return and continue.
1667
1668 BIND(exception_return_sync_check);
1669
1670 if (synchronized) {
1671 // Don't check for exceptions since we're still in the i2n frame. Do that
1672 // manually afterwards.
1673 __ unlock_object(R26_monitor, false); // Can also unlock methods.
1674 }
1675 BIND(exception_return_sync_check_already_unlocked);
1676
1677 const Register return_pc = R31;
1678
1679 __ ld(return_pc, 0, R1_SP);
1680 __ ld(return_pc, _abi(lr), return_pc);
1681
1682 // Get the address of the exception handler.
1683 __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::exception_handler_for_return_address),
1684 R16_thread,
1685 return_pc /* return pc */);
1686 __ merge_frames(/*top_frame_sp*/ R21_sender_SP, noreg, R11_scratch1, R12_scratch2);
1687
1688 // Load the PC of the the exception handler into LR.
1689 __ mtlr(R3_RET);
1690
1691 // Load exception into R3_ARG1 and clear pending exception in thread.
1692 __ ld(R3_ARG1/*exception*/, thread_(pending_exception));
1693 __ li(R4_ARG2, 0);
1694 __ std(R4_ARG2, thread_(pending_exception));
1695
1696 // Load the original return pc into R4_ARG2.
1697 __ mr(R4_ARG2/*issuing_pc*/, return_pc);
1698
1699 // Return to exception handler.
1700 __ blr();
1701
1702 //=============================================================================
1703 // Counter overflow.
1704
1705 if (inc_counter) {
1706 // Handle invocation counter overflow.
1707 __ bind(invocation_counter_overflow);
1708
1709 generate_counter_overflow(continue_after_compile);
1710 }
1711
1712 return entry;
1713 }
1714
1715 // Generic interpreted method entry to (asm) interpreter.
1716 //
1717 address TemplateInterpreterGenerator::generate_normal_entry(bool synchronized) {
1718 bool inc_counter = UseCompiler || CountCompiledCalls || LogTouchedMethods;
1719 address entry = __ pc();
1720 // Generate the code to allocate the interpreter stack frame.
1721 Register Rsize_of_parameters = R4_ARG2, // Written by generate_fixed_frame.
1722 Rsize_of_locals = R5_ARG3; // Written by generate_fixed_frame.
1723
1724 // Does also a stack check to assure this frame fits on the stack.
1725 generate_fixed_frame(false, Rsize_of_parameters, Rsize_of_locals);
1726
1727 // --------------------------------------------------------------------------
1728 // Zero out non-parameter locals.
1729 // Note: *Always* zero out non-parameter locals as Sparc does. It's not
1730 // worth to ask the flag, just do it.
1731 Register Rslot_addr = R6_ARG4,
1732 Rnum = R7_ARG5;
1733 Label Lno_locals, Lzero_loop;
1734
1735 // Set up the zeroing loop.
1736 __ subf(Rnum, Rsize_of_parameters, Rsize_of_locals);
1737 __ subf(Rslot_addr, Rsize_of_parameters, R18_locals);
1738 __ srdi_(Rnum, Rnum, Interpreter::logStackElementSize);
1739 __ beq(CCR0, Lno_locals);
1740 __ li(R0, 0);
1741 __ mtctr(Rnum);
1742
1743 // The zero locals loop.
1744 __ bind(Lzero_loop);
1745 __ std(R0, 0, Rslot_addr);
1746 __ addi(Rslot_addr, Rslot_addr, -Interpreter::stackElementSize);
1747 __ bdnz(Lzero_loop);
1748
1749 __ bind(Lno_locals);
1750
1751 // --------------------------------------------------------------------------
1752 // Counter increment and overflow check.
1753 Label invocation_counter_overflow,
1754 profile_method,
1755 profile_method_continue;
1756 if (inc_counter || ProfileInterpreter) {
1757
1758 Register Rdo_not_unlock_if_synchronized_addr = R11_scratch1;
1759 if (synchronized) {
1760 // Since at this point in the method invocation the exception handler
1761 // would try to exit the monitor of synchronized methods which hasn't
1762 // been entered yet, we set the thread local variable
1763 // _do_not_unlock_if_synchronized to true. If any exception was thrown by
1764 // runtime, exception handling i.e. unlock_if_synchronized_method will
1765 // check this thread local flag.
1766 // This flag has two effects, one is to force an unwind in the topmost
1767 // interpreter frame and not perform an unlock while doing so.
1768 __ li(R0, 1);
1769 __ stb(R0, in_bytes(JavaThread::do_not_unlock_if_synchronized_offset()), R16_thread);
1770 }
1771
1772 // Argument and return type profiling.
1773 __ profile_parameters_type(R3_ARG1, R4_ARG2, R5_ARG3, R6_ARG4);
1774
1775 // Increment invocation counter and check for overflow.
1776 if (inc_counter) {
1777 generate_counter_incr(&invocation_counter_overflow, &profile_method, &profile_method_continue);
1778 }
1779
1780 __ bind(profile_method_continue);
1781 }
1782
1783 bang_stack_shadow_pages(false);
1784
1785 if (inc_counter || ProfileInterpreter) {
1786 // Reset the _do_not_unlock_if_synchronized flag.
1787 if (synchronized) {
1788 __ li(R0, 0);
1789 __ stb(R0, in_bytes(JavaThread::do_not_unlock_if_synchronized_offset()), R16_thread);
1790 }
1791 }
1792
1793 // --------------------------------------------------------------------------
1794 // Locking of synchronized methods. Must happen AFTER invocation_counter
1795 // check and stack overflow check, so method is not locked if overflows.
1796 if (synchronized) {
1797 lock_method(R3_ARG1, R4_ARG2, R5_ARG3);
1798 }
1799 #ifdef ASSERT
1800 else {
1801 Label Lok;
1802 __ lwz(R0, in_bytes(Method::access_flags_offset()), R19_method);
1803 __ andi_(R0, R0, JVM_ACC_SYNCHRONIZED);
1804 __ asm_assert_eq("method needs synchronization", 0x8521);
1805 __ bind(Lok);
1806 }
1807 #endif // ASSERT
1808
1809 __ verify_thread();
1810
1811 // --------------------------------------------------------------------------
1812 // JVMTI support
1813 __ notify_method_entry();
1814
1815 // --------------------------------------------------------------------------
1816 // Start executing instructions.
1817 __ dispatch_next(vtos);
1818
1819 // --------------------------------------------------------------------------
1820 // Out of line counter overflow and MDO creation code.
1821 if (ProfileInterpreter) {
1822 // We have decided to profile this method in the interpreter.
1823 __ bind(profile_method);
1824 __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::profile_method));
1825 __ set_method_data_pointer_for_bcp();
1826 __ b(profile_method_continue);
1827 }
1828
1829 if (inc_counter) {
1830 // Handle invocation counter overflow.
1831 __ bind(invocation_counter_overflow);
1832 generate_counter_overflow(profile_method_continue);
1833 }
1834 return entry;
1835 }
1836
1837 // CRC32 Intrinsics.
1838 //
1839 // Contract on scratch and work registers.
1840 // =======================================
1841 //
1842 // On ppc, the register set {R2..R12} is available in the interpreter as scratch/work registers.
1843 // You should, however, keep in mind that {R3_ARG1..R10_ARG8} is the C-ABI argument register set.
1844 // You can't rely on these registers across calls.
1845 //
1846 // The generators for CRC32_update and for CRC32_updateBytes use the
1847 // scratch/work register set internally, passing the work registers
1848 // as arguments to the MacroAssembler emitters as required.
1849 //
1850 // R3_ARG1..R6_ARG4 are preset to hold the incoming java arguments.
1851 // Their contents is not constant but may change according to the requirements
1852 // of the emitted code.
1853 //
1854 // All other registers from the scratch/work register set are used "internally"
1855 // and contain garbage (i.e. unpredictable values) once blr() is reached.
1856 // Basically, only R3_RET contains a defined value which is the function result.
1857 //
1858 /**
1859 * Method entry for static native methods:
1860 * int java.util.zip.CRC32.update(int crc, int b)
1861 */
1862 address TemplateInterpreterGenerator::generate_CRC32_update_entry() {
1863 if (UseCRC32Intrinsics) {
1864 address start = __ pc(); // Remember stub start address (is rtn value).
1865 Label slow_path;
1866
1867 // Safepoint check
1868 const Register sync_state = R11_scratch1;
1869 int sync_state_offs = __ load_const_optimized(sync_state, SafepointSynchronize::address_of_state(), /*temp*/R0, true);
1870 __ lwz(sync_state, sync_state_offs, sync_state);
1871 __ cmpwi(CCR0, sync_state, SafepointSynchronize::_not_synchronized);
1872 __ bne(CCR0, slow_path);
1873
1874 // We don't generate local frame and don't align stack because
1875 // we not even call stub code (we generate the code inline)
1876 // and there is no safepoint on this path.
1877
1878 // Load java parameters.
1879 // R15_esp is callers operand stack pointer, i.e. it points to the parameters.
1880 const Register argP = R15_esp;
1881 const Register crc = R3_ARG1; // crc value
1882 const Register data = R4_ARG2; // address of java byte value (kernel_crc32 needs address)
1883 const Register dataLen = R5_ARG3; // source data len (1 byte). Not used because calling the single-byte emitter.
1884 const Register table = R6_ARG4; // address of crc32 table
1885 const Register tmp = dataLen; // Reuse unused len register to show we don't actually need a separate tmp here.
1886
1887 BLOCK_COMMENT("CRC32_update {");
1888
1889 // Arguments are reversed on java expression stack
1890 #ifdef VM_LITTLE_ENDIAN
1891 __ addi(data, argP, 0+1*wordSize); // (stack) address of byte value. Emitter expects address, not value.
1892 // Being passed as an int, the single byte is at offset +0.
1893 #else
1894 __ addi(data, argP, 3+1*wordSize); // (stack) address of byte value. Emitter expects address, not value.
1895 // Being passed from java as an int, the single byte is at offset +3.
1896 #endif
1897 __ lwz(crc, 2*wordSize, argP); // Current crc state, zero extend to 64 bit to have a clean register.
1898
1899 StubRoutines::ppc64::generate_load_crc_table_addr(_masm, table);
1900 __ kernel_crc32_singleByte(crc, data, dataLen, table, tmp);
1901
1902 // Restore caller sp for c2i case and return.
1903 __ mr(R1_SP, R21_sender_SP); // Cut the stack back to where the caller started.
1904 __ blr();
1905
1906 // Generate a vanilla native entry as the slow path.
1907 BLOCK_COMMENT("} CRC32_update");
1908 BIND(slow_path);
1909 __ jump_to_entry(Interpreter::entry_for_kind(Interpreter::native), R11_scratch1);
1910 return start;
1911 }
1912
1913 return NULL;
1914 }
1915
1916 // CRC32 Intrinsics.
1917 /**
1918 * Method entry for static native methods:
1919 * int java.util.zip.CRC32.updateBytes( int crc, byte[] b, int off, int len)
1920 * int java.util.zip.CRC32.updateByteBuffer(int crc, long* buf, int off, int len)
1921 */
1922 address TemplateInterpreterGenerator::generate_CRC32_updateBytes_entry(AbstractInterpreter::MethodKind kind) {
1923 if (UseCRC32Intrinsics) {
1924 address start = __ pc(); // Remember stub start address (is rtn value).
1925 Label slow_path;
1926
1927 // Safepoint check
1928 const Register sync_state = R11_scratch1;
1929 int sync_state_offs = __ load_const_optimized(sync_state, SafepointSynchronize::address_of_state(), /*temp*/R0, true);
1930 __ lwz(sync_state, sync_state_offs, sync_state);
1931 __ cmpwi(CCR0, sync_state, SafepointSynchronize::_not_synchronized);
1932 __ bne(CCR0, slow_path);
1933
1934 // We don't generate local frame and don't align stack because
1935 // we not even call stub code (we generate the code inline)
1936 // and there is no safepoint on this path.
1937
1938 // Load parameters.
1939 // Z_esp is callers operand stack pointer, i.e. it points to the parameters.
1940 const Register argP = R15_esp;
1941 const Register crc = R3_ARG1; // crc value
1942 const Register data = R4_ARG2; // address of java byte array
1943 const Register dataLen = R5_ARG3; // source data len
1944 const Register table = R6_ARG4; // address of crc32 table
1945
1946 const Register t0 = R9; // scratch registers for crc calculation
1947 const Register t1 = R10;
1948 const Register t2 = R11;
1949 const Register t3 = R12;
1950
1951 const Register tc0 = R2; // registers to hold pre-calculated column addresses
1952 const Register tc1 = R7;
1953 const Register tc2 = R8;
1954 const Register tc3 = table; // table address is reconstructed at the end of kernel_crc32_* emitters
1955
1956 const Register tmp = t0; // Only used very locally to calculate byte buffer address.
1957
1958 // Arguments are reversed on java expression stack.
1959 // Calculate address of start element.
1960 if (kind == Interpreter::java_util_zip_CRC32_updateByteBuffer) { // Used for "updateByteBuffer direct".
1961 BLOCK_COMMENT("CRC32_updateByteBuffer {");
1962 // crc @ (SP + 5W) (32bit)
1963 // buf @ (SP + 3W) (64bit ptr to long array)
1964 // off @ (SP + 2W) (32bit)
1965 // dataLen @ (SP + 1W) (32bit)
1966 // data = buf + off
1967 __ ld( data, 3*wordSize, argP); // start of byte buffer
1968 __ lwa( tmp, 2*wordSize, argP); // byte buffer offset
1969 __ lwa( dataLen, 1*wordSize, argP); // #bytes to process
1970 __ lwz( crc, 5*wordSize, argP); // current crc state
1971 __ add( data, data, tmp); // Add byte buffer offset.
1972 } else { // Used for "updateBytes update".
1973 BLOCK_COMMENT("CRC32_updateBytes {");
1974 // crc @ (SP + 4W) (32bit)
1975 // buf @ (SP + 3W) (64bit ptr to byte array)
1976 // off @ (SP + 2W) (32bit)
1977 // dataLen @ (SP + 1W) (32bit)
1978 // data = buf + off + base_offset
1979 __ ld( data, 3*wordSize, argP); // start of byte buffer
1980 __ lwa( tmp, 2*wordSize, argP); // byte buffer offset
1981 __ lwa( dataLen, 1*wordSize, argP); // #bytes to process
1982 __ add( data, data, tmp); // add byte buffer offset
1983 __ lwz( crc, 4*wordSize, argP); // current crc state
1984 __ addi(data, data, arrayOopDesc::base_offset_in_bytes(T_BYTE));
1985 }
1986
1987 StubRoutines::ppc64::generate_load_crc_table_addr(_masm, table);
1988
1989 // Performance measurements show the 1word and 2word variants to be almost equivalent,
1990 // with very light advantages for the 1word variant. We chose the 1word variant for
1991 // code compactness.
1992 __ kernel_crc32_1word(crc, data, dataLen, table, t0, t1, t2, t3, tc0, tc1, tc2, tc3);
1993
1994 // Restore caller sp for c2i case and return.
1995 __ mr(R1_SP, R21_sender_SP); // Cut the stack back to where the caller started.
1996 __ blr();
1997
1998 // Generate a vanilla native entry as the slow path.
1999 BLOCK_COMMENT("} CRC32_updateBytes(Buffer)");
2000 BIND(slow_path);
2001 __ jump_to_entry(Interpreter::entry_for_kind(Interpreter::native), R11_scratch1);
2002 return start;
2003 }
2004
2005 return NULL;
2006 }
2007
2008 // Not supported
2009 address TemplateInterpreterGenerator::generate_CRC32C_updateBytes_entry(AbstractInterpreter::MethodKind kind) {
2010 return NULL;
2011 }
2012
2013 // =============================================================================
2014 // Exceptions
2015
2016 void TemplateInterpreterGenerator::generate_throw_exception() {
2017 Register Rexception = R17_tos,
2018 Rcontinuation = R3_RET;
2019
2020 // --------------------------------------------------------------------------
2021 // Entry point if an method returns with a pending exception (rethrow).
2022 Interpreter::_rethrow_exception_entry = __ pc();
2023 {
2024 __ restore_interpreter_state(R11_scratch1); // Sets R11_scratch1 = fp.
2025 __ ld(R12_scratch2, _ijava_state_neg(top_frame_sp), R11_scratch1);
2026 __ resize_frame_absolute(R12_scratch2, R11_scratch1, R0);
2027
2028 // Compiled code destroys templateTableBase, reload.
2029 __ load_const_optimized(R25_templateTableBase, (address)Interpreter::dispatch_table((TosState)0), R11_scratch1);
2030 }
2031
2032 // Entry point if a interpreted method throws an exception (throw).
2033 Interpreter::_throw_exception_entry = __ pc();
2034 {
2035 __ mr(Rexception, R3_RET);
2036
2037 __ verify_thread();
2038 __ verify_oop(Rexception);
2039
2040 // Expression stack must be empty before entering the VM in case of an exception.
2041 __ empty_expression_stack();
2042 // Find exception handler address and preserve exception oop.
2043 // Call C routine to find handler and jump to it.
2044 __ call_VM(Rexception, CAST_FROM_FN_PTR(address, InterpreterRuntime::exception_handler_for_exception), Rexception);
2045 __ mtctr(Rcontinuation);
2046 // Push exception for exception handler bytecodes.
2047 __ push_ptr(Rexception);
2048
2049 // Jump to exception handler (may be remove activation entry!).
2050 __ bctr();
2051 }
2052
2053 // If the exception is not handled in the current frame the frame is
2054 // removed and the exception is rethrown (i.e. exception
2055 // continuation is _rethrow_exception).
2056 //
2057 // Note: At this point the bci is still the bxi for the instruction
2058 // which caused the exception and the expression stack is
2059 // empty. Thus, for any VM calls at this point, GC will find a legal
2060 // oop map (with empty expression stack).
2061
2062 // In current activation
2063 // tos: exception
2064 // bcp: exception bcp
2065
2066 // --------------------------------------------------------------------------
2067 // JVMTI PopFrame support
2068
2069 Interpreter::_remove_activation_preserving_args_entry = __ pc();
2070 {
2071 // Set the popframe_processing bit in popframe_condition indicating that we are
2072 // currently handling popframe, so that call_VMs that may happen later do not
2073 // trigger new popframe handling cycles.
2074 __ lwz(R11_scratch1, in_bytes(JavaThread::popframe_condition_offset()), R16_thread);
2075 __ ori(R11_scratch1, R11_scratch1, JavaThread::popframe_processing_bit);
2076 __ stw(R11_scratch1, in_bytes(JavaThread::popframe_condition_offset()), R16_thread);
2077
2078 // Empty the expression stack, as in normal exception handling.
2079 __ empty_expression_stack();
2080 __ unlock_if_synchronized_method(vtos, /* throw_monitor_exception */ false, /* install_monitor_exception */ false);
2081
2082 // Check to see whether we are returning to a deoptimized frame.
2083 // (The PopFrame call ensures that the caller of the popped frame is
2084 // either interpreted or compiled and deoptimizes it if compiled.)
2085 // Note that we don't compare the return PC against the
2086 // deoptimization blob's unpack entry because of the presence of
2087 // adapter frames in C2.
2088 Label Lcaller_not_deoptimized;
2089 Register return_pc = R3_ARG1;
2090 __ ld(return_pc, 0, R1_SP);
2091 __ ld(return_pc, _abi(lr), return_pc);
2092 __ call_VM_leaf(CAST_FROM_FN_PTR(address, InterpreterRuntime::interpreter_contains), return_pc);
2093 __ cmpdi(CCR0, R3_RET, 0);
2094 __ bne(CCR0, Lcaller_not_deoptimized);
2095
2096 // The deoptimized case.
2097 // In this case, we can't call dispatch_next() after the frame is
2098 // popped, but instead must save the incoming arguments and restore
2099 // them after deoptimization has occurred.
2100 __ ld(R4_ARG2, in_bytes(Method::const_offset()), R19_method);
2101 __ lhz(R4_ARG2 /* number of params */, in_bytes(ConstMethod::size_of_parameters_offset()), R4_ARG2);
2102 __ slwi(R4_ARG2, R4_ARG2, Interpreter::logStackElementSize);
2103 __ addi(R5_ARG3, R18_locals, Interpreter::stackElementSize);
2104 __ subf(R5_ARG3, R4_ARG2, R5_ARG3);
2105 // Save these arguments.
2106 __ call_VM_leaf(CAST_FROM_FN_PTR(address, Deoptimization::popframe_preserve_args), R16_thread, R4_ARG2, R5_ARG3);
2107
2108 // Inform deoptimization that it is responsible for restoring these arguments.
2109 __ load_const_optimized(R11_scratch1, JavaThread::popframe_force_deopt_reexecution_bit);
2110 __ stw(R11_scratch1, in_bytes(JavaThread::popframe_condition_offset()), R16_thread);
2111
2112 // Return from the current method into the deoptimization blob. Will eventually
2113 // end up in the deopt interpeter entry, deoptimization prepared everything that
2114 // we will reexecute the call that called us.
2115 __ merge_frames(/*top_frame_sp*/ R21_sender_SP, /*reload return_pc*/ return_pc, R11_scratch1, R12_scratch2);
2116 __ mtlr(return_pc);
2117 __ blr();
2118
2119 // The non-deoptimized case.
2120 __ bind(Lcaller_not_deoptimized);
2121
2122 // Clear the popframe condition flag.
2123 __ li(R0, 0);
2124 __ stw(R0, in_bytes(JavaThread::popframe_condition_offset()), R16_thread);
2125
2126 // Get out of the current method and re-execute the call that called us.
2127 __ merge_frames(/*top_frame_sp*/ R21_sender_SP, /*return_pc*/ noreg, R11_scratch1, R12_scratch2);
2128 __ restore_interpreter_state(R11_scratch1);
2129 __ ld(R12_scratch2, _ijava_state_neg(top_frame_sp), R11_scratch1);
2130 __ resize_frame_absolute(R12_scratch2, R11_scratch1, R0);
2131 if (ProfileInterpreter) {
2132 __ set_method_data_pointer_for_bcp();
2133 __ ld(R11_scratch1, 0, R1_SP);
2134 __ std(R28_mdx, _ijava_state_neg(mdx), R11_scratch1);
2135 }
2136 #if INCLUDE_JVMTI
2137 Label L_done;
2138
2139 __ lbz(R11_scratch1, 0, R14_bcp);
2140 __ cmpwi(CCR0, R11_scratch1, Bytecodes::_invokestatic);
2141 __ bne(CCR0, L_done);
2142
2143 // The member name argument must be restored if _invokestatic is re-executed after a PopFrame call.
2144 // Detect such a case in the InterpreterRuntime function and return the member name argument, or NULL.
2145 __ ld(R4_ARG2, 0, R18_locals);
2146 __ MacroAssembler::call_VM(R4_ARG2, CAST_FROM_FN_PTR(address, InterpreterRuntime::member_name_arg_or_null), R4_ARG2, R19_method, R14_bcp, false);
2147 __ restore_interpreter_state(R11_scratch1, /*bcp_and_mdx_only*/ true);
2148 __ cmpdi(CCR0, R4_ARG2, 0);
2149 __ beq(CCR0, L_done);
2150 __ std(R4_ARG2, wordSize, R15_esp);
2151 __ bind(L_done);
2152 #endif // INCLUDE_JVMTI
2153 __ dispatch_next(vtos);
2154 }
2155 // end of JVMTI PopFrame support
2156
2157 // --------------------------------------------------------------------------
2158 // Remove activation exception entry.
2159 // This is jumped to if an interpreted method can't handle an exception itself
2160 // (we come from the throw/rethrow exception entry above). We're going to call
2161 // into the VM to find the exception handler in the caller, pop the current
2162 // frame and return the handler we calculated.
2163 Interpreter::_remove_activation_entry = __ pc();
2164 {
2165 __ pop_ptr(Rexception);
2166 __ verify_thread();
2167 __ verify_oop(Rexception);
2168 __ std(Rexception, in_bytes(JavaThread::vm_result_offset()), R16_thread);
2169
2170 __ unlock_if_synchronized_method(vtos, /* throw_monitor_exception */ false, true);
2171 __ notify_method_exit(false, vtos, InterpreterMacroAssembler::SkipNotifyJVMTI, false);
2172
2173 __ get_vm_result(Rexception);
2174
2175 // We are done with this activation frame; find out where to go next.
2176 // The continuation point will be an exception handler, which expects
2177 // the following registers set up:
2178 //
2179 // RET: exception oop
2180 // ARG2: Issuing PC (see generate_exception_blob()), only used if the caller is compiled.
2181
2182 Register return_pc = R31; // Needs to survive the runtime call.
2183 __ ld(return_pc, 0, R1_SP);
2184 __ ld(return_pc, _abi(lr), return_pc);
2185 __ call_VM_leaf(CAST_FROM_FN_PTR(address, SharedRuntime::exception_handler_for_return_address), R16_thread, return_pc);
2186
2187 // Remove the current activation.
2188 __ merge_frames(/*top_frame_sp*/ R21_sender_SP, /*return_pc*/ noreg, R11_scratch1, R12_scratch2);
2189
2190 __ mr(R4_ARG2, return_pc);
2191 __ mtlr(R3_RET);
2192 __ mr(R3_RET, Rexception);
2193 __ blr();
2194 }
2195 }
2196
2197 // JVMTI ForceEarlyReturn support.
2198 // Returns "in the middle" of a method with a "fake" return value.
2199 address TemplateInterpreterGenerator::generate_earlyret_entry_for(TosState state) {
2200
2201 Register Rscratch1 = R11_scratch1,
2202 Rscratch2 = R12_scratch2;
2203
2204 address entry = __ pc();
2205 __ empty_expression_stack();
2206
2207 __ load_earlyret_value(state, Rscratch1);
2208
2209 __ ld(Rscratch1, in_bytes(JavaThread::jvmti_thread_state_offset()), R16_thread);
2210 // Clear the earlyret state.
2211 __ li(R0, 0);
2212 __ stw(R0, in_bytes(JvmtiThreadState::earlyret_state_offset()), Rscratch1);
2213
2214 __ remove_activation(state, false, false);
2215 // Copied from TemplateTable::_return.
2216 // Restoration of lr done by remove_activation.
2217 switch (state) {
2218 // Narrow result if state is itos but result type is smaller.
2219 case btos:
2220 case ztos:
2221 case ctos:
2222 case stos:
2223 case itos: __ narrow(R17_tos); /* fall through */
2224 case ltos:
2225 case atos: __ mr(R3_RET, R17_tos); break;
2226 case ftos:
2227 case dtos: __ fmr(F1_RET, F15_ftos); break;
2228 case vtos: // This might be a constructor. Final fields (and volatile fields on PPC64) need
2229 // to get visible before the reference to the object gets stored anywhere.
2230 __ membar(Assembler::StoreStore); break;
2231 default : ShouldNotReachHere();
2232 }
2233 __ blr();
2234
2235 return entry;
2236 } // end of ForceEarlyReturn support
2237
2238 //-----------------------------------------------------------------------------
2239 // Helper for vtos entry point generation
2240
2241 void TemplateInterpreterGenerator::set_vtos_entry_points(Template* t,
2242 address& bep,
2243 address& cep,
2244 address& sep,
2245 address& aep,
2246 address& iep,
2247 address& lep,
2248 address& fep,
2249 address& dep,
2250 address& vep) {
2251 assert(t->is_valid() && t->tos_in() == vtos, "illegal template");
2252 Label L;
2253
2254 aep = __ pc(); __ push_ptr(); __ b(L);
2255 fep = __ pc(); __ push_f(); __ b(L);
2256 dep = __ pc(); __ push_d(); __ b(L);
2257 lep = __ pc(); __ push_l(); __ b(L);
2258 __ align(32, 12, 24); // align L
2259 bep = cep = sep =
2260 iep = __ pc(); __ push_i();
2261 vep = __ pc();
2262 __ bind(L);
2263 generate_and_dispatch(t);
2264 }
2265
2266 //-----------------------------------------------------------------------------
2267
2268 // Non-product code
2269 #ifndef PRODUCT
2270 address TemplateInterpreterGenerator::generate_trace_code(TosState state) {
2271 //__ flush_bundle();
2272 address entry = __ pc();
2273
2274 const char *bname = NULL;
2275 uint tsize = 0;
2276 switch(state) {
2277 case ftos:
2278 bname = "trace_code_ftos {";
2279 tsize = 2;
2280 break;
2281 case btos:
2282 bname = "trace_code_btos {";
2283 tsize = 2;
2284 break;
2285 case ztos:
2286 bname = "trace_code_ztos {";
2287 tsize = 2;
2288 break;
2289 case ctos:
2290 bname = "trace_code_ctos {";
2291 tsize = 2;
2292 break;
2293 case stos:
2294 bname = "trace_code_stos {";
2295 tsize = 2;
2296 break;
2297 case itos:
2298 bname = "trace_code_itos {";
2299 tsize = 2;
2300 break;
2301 case ltos:
2302 bname = "trace_code_ltos {";
2303 tsize = 3;
2304 break;
2305 case atos:
2306 bname = "trace_code_atos {";
2307 tsize = 2;
2308 break;
2309 case vtos:
2310 // Note: In case of vtos, the topmost of stack value could be a int or doubl
2311 // In case of a double (2 slots) we won't see the 2nd stack value.
2312 // Maybe we simply should print the topmost 3 stack slots to cope with the problem.
2313 bname = "trace_code_vtos {";
2314 tsize = 2;
2315
2316 break;
2317 case dtos:
2318 bname = "trace_code_dtos {";
2319 tsize = 3;
2320 break;
2321 default:
2322 ShouldNotReachHere();
2323 }
2324 BLOCK_COMMENT(bname);
2325
2326 // Support short-cut for TraceBytecodesAt.
2327 // Don't call into the VM if we don't want to trace to speed up things.
2328 Label Lskip_vm_call;
2329 if (TraceBytecodesAt > 0 && TraceBytecodesAt < max_intx) {
2330 int offs1 = __ load_const_optimized(R11_scratch1, (address) &TraceBytecodesAt, R0, true);
2331 int offs2 = __ load_const_optimized(R12_scratch2, (address) &BytecodeCounter::_counter_value, R0, true);
2332 __ ld(R11_scratch1, offs1, R11_scratch1);
2333 __ lwa(R12_scratch2, offs2, R12_scratch2);
2334 __ cmpd(CCR0, R12_scratch2, R11_scratch1);
2335 __ blt(CCR0, Lskip_vm_call);
2336 }
2337
2338 __ push(state);
2339 // Load 2 topmost expression stack values.
2340 __ ld(R6_ARG4, tsize*Interpreter::stackElementSize, R15_esp);
2341 __ ld(R5_ARG3, Interpreter::stackElementSize, R15_esp);
2342 __ mflr(R31);
2343 __ call_VM(noreg, CAST_FROM_FN_PTR(address, InterpreterRuntime::trace_bytecode), /* unused */ R4_ARG2, R5_ARG3, R6_ARG4, false);
2344 __ mtlr(R31);
2345 __ pop(state);
2346
2347 if (TraceBytecodesAt > 0 && TraceBytecodesAt < max_intx) {
2348 __ bind(Lskip_vm_call);
2349 }
2350 __ blr();
2351 BLOCK_COMMENT("} trace_code");
2352 return entry;
2353 }
2354
2355 void TemplateInterpreterGenerator::count_bytecode() {
2356 int offs = __ load_const_optimized(R11_scratch1, (address) &BytecodeCounter::_counter_value, R12_scratch2, true);
2357 __ lwz(R12_scratch2, offs, R11_scratch1);
2358 __ addi(R12_scratch2, R12_scratch2, 1);
2359 __ stw(R12_scratch2, offs, R11_scratch1);
2360 }
2361
2362 void TemplateInterpreterGenerator::histogram_bytecode(Template* t) {
2363 int offs = __ load_const_optimized(R11_scratch1, (address) &BytecodeHistogram::_counters[t->bytecode()], R12_scratch2, true);
2364 __ lwz(R12_scratch2, offs, R11_scratch1);
2365 __ addi(R12_scratch2, R12_scratch2, 1);
2366 __ stw(R12_scratch2, offs, R11_scratch1);
2367 }
2368
2369 void TemplateInterpreterGenerator::histogram_bytecode_pair(Template* t) {
2370 const Register addr = R11_scratch1,
2371 tmp = R12_scratch2;
2372 // Get index, shift out old bytecode, bring in new bytecode, and store it.
2373 // _index = (_index >> log2_number_of_codes) |
2374 // (bytecode << log2_number_of_codes);
2375 int offs1 = __ load_const_optimized(addr, (address)&BytecodePairHistogram::_index, tmp, true);
2376 __ lwz(tmp, offs1, addr);
2377 __ srwi(tmp, tmp, BytecodePairHistogram::log2_number_of_codes);
2378 __ ori(tmp, tmp, ((int) t->bytecode()) << BytecodePairHistogram::log2_number_of_codes);
2379 __ stw(tmp, offs1, addr);
2380
2381 // Bump bucket contents.
2382 // _counters[_index] ++;
2383 int offs2 = __ load_const_optimized(addr, (address)&BytecodePairHistogram::_counters, R0, true);
2384 __ sldi(tmp, tmp, LogBytesPerInt);
2385 __ add(addr, tmp, addr);
2386 __ lwz(tmp, offs2, addr);
2387 __ addi(tmp, tmp, 1);
2388 __ stw(tmp, offs2, addr);
2389 }
2390
2391 void TemplateInterpreterGenerator::trace_bytecode(Template* t) {
2392 // Call a little run-time stub to avoid blow-up for each bytecode.
2393 // The run-time runtime saves the right registers, depending on
2394 // the tosca in-state for the given template.
2395
2396 assert(Interpreter::trace_code(t->tos_in()) != NULL,
2397 "entry must have been generated");
2398
2399 // Note: we destroy LR here.
2400 __ bl(Interpreter::trace_code(t->tos_in()));
2401 }
2402
2403 void TemplateInterpreterGenerator::stop_interpreter_at() {
2404 Label L;
2405 int offs1 = __ load_const_optimized(R11_scratch1, (address) &StopInterpreterAt, R0, true);
2406 int offs2 = __ load_const_optimized(R12_scratch2, (address) &BytecodeCounter::_counter_value, R0, true);
2407 __ ld(R11_scratch1, offs1, R11_scratch1);
2408 __ lwa(R12_scratch2, offs2, R12_scratch2);
2409 __ cmpd(CCR0, R12_scratch2, R11_scratch1);
2410 __ bne(CCR0, L);
2411 __ illtrap();
2412 __ bind(L);
2413 }
2414
2415 #endif // !PRODUCT