1 /*
2 * Copyright (c) 2016, 2017, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2016 SAP SE. All rights reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
24 */
25
26 #include "precompiled.hpp"
27 #include "asm/macroAssembler.inline.hpp"
28 #include "classfile/javaClasses.inline.hpp"
29 #include "interpreter/interpreter.hpp"
30 #include "memory/allocation.inline.hpp"
31 #include "memory/resourceArea.hpp"
32 #include "prims/methodHandles.hpp"
33
34 #ifdef PRODUCT
35 #define __ _masm->
36 #define BLOCK_COMMENT(str) /* nothing */
37 #else
38 #define __ (Verbose ? (_masm->block_comment(FILE_AND_LINE),_masm):_masm)->
39 #define BLOCK_COMMENT(str) __ block_comment(str)
40 #endif
41
42 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":")
43
44 // Workaround for C++ overloading nastiness on '0' for RegisterOrConstant.
45 static RegisterOrConstant constant(int value) {
46 return RegisterOrConstant(value);
47 }
48
49 void MethodHandles::load_klass_from_Class(MacroAssembler* _masm, Register klass_reg,
50 Register temp_reg, Register temp2_reg) {
51 if (VerifyMethodHandles) {
52 verify_klass(_masm, klass_reg, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_Class),
53 temp_reg, temp2_reg, "MH argument is a Class");
54 }
55 __ z_lg(klass_reg, Address(klass_reg, java_lang_Class::klass_offset_in_bytes()));
56 }
57
58
59 #ifdef ASSERT
60 static int check_nonzero(const char* xname, int x) {
61 assert(x != 0, "%s should be nonzero", xname);
62 return x;
63 }
64 #define NONZERO(x) check_nonzero(#x, x)
65 #else
66 #define NONZERO(x) (x)
67 #endif
68
69 #ifdef ASSERT
70 void MethodHandles::verify_klass(MacroAssembler* _masm,
71 Register obj_reg, SystemDictionary::WKID klass_id,
72 Register temp_reg, Register temp2_reg,
73 const char* error_message) {
74
75 InstanceKlass** klass_addr = SystemDictionary::well_known_klass_addr(klass_id);
76 Klass* klass = SystemDictionary::well_known_klass(klass_id);
77
78 assert(temp_reg != Z_R0 && // Is used as base register!
79 temp_reg != noreg && temp2_reg != noreg, "need valid registers!");
80
81 NearLabel L_ok, L_bad;
82
83 BLOCK_COMMENT("verify_klass {");
84
85 __ verify_oop(obj_reg);
86 __ compareU64_and_branch(obj_reg, (intptr_t)0L, Assembler::bcondEqual, L_bad);
87 __ load_klass(temp_reg, obj_reg);
88 // klass_addr is a klass in allstatic SystemDictionaryHandles. Can't get GCed.
89 __ load_const_optimized(temp2_reg, (address)klass_addr);
90 __ z_lg(temp2_reg, Address(temp2_reg));
91 __ compareU64_and_branch(temp_reg, temp2_reg, Assembler::bcondEqual, L_ok);
92
93 intptr_t super_check_offset = klass->super_check_offset();
94 __ z_lg(temp_reg, Address(temp_reg, super_check_offset));
95 __ compareU64_and_branch(temp_reg, temp2_reg, Assembler::bcondEqual, L_ok);
96 __ BIND(L_bad);
97 __ stop(error_message);
98 __ BIND(L_ok);
99
100 BLOCK_COMMENT("} verify_klass");
101 }
102
103 void MethodHandles::verify_ref_kind(MacroAssembler* _masm, int ref_kind,
104 Register member_reg, Register temp ) {
105 NearLabel L;
106 BLOCK_COMMENT("verify_ref_kind {");
107
108 __ z_llgf(temp,
109 Address(member_reg,
110 NONZERO(java_lang_invoke_MemberName::flags_offset_in_bytes())));
111 __ z_srl(temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT);
112 __ z_nilf(temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK);
113 __ compare32_and_branch(temp, constant(ref_kind), Assembler::bcondEqual, L);
114
115 {
116 char *buf = NEW_C_HEAP_ARRAY(char, 100, mtInternal);
117
118 jio_snprintf(buf, 100, "verify_ref_kind expected %x", ref_kind);
119 if (ref_kind == JVM_REF_invokeVirtual || ref_kind == JVM_REF_invokeSpecial) {
120 // Could do this for all ref_kinds, but would explode assembly code size.
121 trace_method_handle(_masm, buf);
122 }
123 __ stop(buf);
124 }
125
126 BLOCK_COMMENT("} verify_ref_kind");
127
128 __ bind(L);
129 }
130 #endif // ASSERT
131
132 void MethodHandles::jump_from_method_handle(MacroAssembler* _masm, Register method, Register target,
133 Register temp, bool for_compiler_entry) {
134 assert(method == Z_method, "interpreter calling convention");
135 __ verify_method_ptr(method);
136
137 assert(target != method, "don 't you kill the method reg!");
138
139 Label L_no_such_method;
140
141 if (!for_compiler_entry && JvmtiExport::can_post_interpreter_events()) {
142 // JVMTI events, such as single-stepping, are implemented partly
143 // by avoiding running compiled code in threads for which the
144 // event is enabled. Check here for interp_only_mode if these
145 // events CAN be enabled.
146 __ verify_thread();
147
148 Label run_compiled_code;
149
150 __ load_and_test_int(temp, Address(Z_thread, JavaThread::interp_only_mode_offset()));
151 __ z_bre(run_compiled_code);
152
153 // Null method test is replicated below in compiled case,
154 // it might be able to address across the verify_thread().
155 __ z_ltgr(temp, method);
156 __ z_bre(L_no_such_method);
157
158 __ z_lg(target, Address(method, Method::interpreter_entry_offset()));
159 __ z_br(target);
160
161 __ bind(run_compiled_code);
162 }
163
164 // Compiled case, either static or fall-through from runtime conditional.
165 __ z_ltgr(temp, method);
166 __ z_bre(L_no_such_method);
167
168 ByteSize offset = for_compiler_entry ?
169 Method::from_compiled_offset() : Method::from_interpreted_offset();
170 Address method_from(method, offset);
171
172 __ z_lg(target, method_from);
173 __ z_br(target);
174
175 __ bind(L_no_such_method);
176 assert(StubRoutines::throw_AbstractMethodError_entry() != NULL, "not yet generated!");
177 __ load_const_optimized(target, StubRoutines::throw_AbstractMethodError_entry());
178 __ z_br(target);
179 }
180
181 void MethodHandles::jump_to_lambda_form(MacroAssembler* _masm,
182 Register recv, Register method_temp,
183 Register temp2, Register temp3,
184 bool for_compiler_entry) {
185
186 // This is the initial entry point of a lazy method handle.
187 // After type checking, it picks up the invoker from the LambdaForm.
188 assert_different_registers(recv, method_temp, temp2, temp3);
189 assert(method_temp == Z_method, "required register for loading method");
190
191 BLOCK_COMMENT("jump_to_lambda_form {");
192
193 // Load the invoker, as MH -> MH.form -> LF.vmentry
194 __ verify_oop(recv);
195 __ load_heap_oop(method_temp,
196 Address(recv,
197 NONZERO(java_lang_invoke_MethodHandle::form_offset_in_bytes())));
198 __ verify_oop(method_temp);
199 __ load_heap_oop(method_temp,
200 Address(method_temp,
201 NONZERO(java_lang_invoke_LambdaForm::vmentry_offset_in_bytes())));
202 __ verify_oop(method_temp);
203 // The following assumes that a method is normally compressed in the vmtarget field.
204 __ z_lg(method_temp,
205 Address(method_temp,
206 NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes())));
207
208 if (VerifyMethodHandles && !for_compiler_entry) {
209 // Make sure recv is already on stack.
210 NearLabel L;
211 Address paramSize(temp2, ConstMethod::size_of_parameters_offset());
212
213 __ z_lg(temp2, Address(method_temp, Method::const_offset()));
214 __ load_sized_value(temp2, paramSize, sizeof(u2), /*is_signed*/ false);
215 // if (temp2 != recv) stop
216 __ z_lg(temp2, __ argument_address(temp2, temp2, 0));
217 __ compare64_and_branch(temp2, recv, Assembler::bcondEqual, L);
218 __ stop("receiver not on stack");
219 __ BIND(L);
220 }
221
222 jump_from_method_handle(_masm, method_temp, temp2, Z_R0, for_compiler_entry);
223
224 BLOCK_COMMENT("} jump_to_lambda_form");
225 }
226
227 // code generation
228 address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* _masm,
229 vmIntrinsics::ID iid) {
230 const bool not_for_compiler_entry = false; // This is the interpreter entry.
231 assert(is_signature_polymorphic(iid), "expected invoke iid");
232
233 if (iid == vmIntrinsics::_invokeGeneric || iid == vmIntrinsics::_compiledLambdaForm) {
234 // Perhaps surprisingly, the symbolic references visible to Java
235 // are not directly used. They are linked to Java-generated
236 // adapters via MethodHandleNatives.linkMethod. They all allow an
237 // appendix argument.
238 __ should_not_reach_here(); // Empty stubs make SG sick.
239 return NULL;
240 }
241
242 // Z_R10: sender SP (must preserve; see prepare_to_jump_from_interprted)
243 // Z_method: method
244 // Z_ARG1 (Gargs): incoming argument list (must preserve)
245 Register Z_R4_param_size = Z_R4; // size of parameters
246 address code_start = __ pc();
247
248 // Here is where control starts out:
249 __ align(CodeEntryAlignment);
250
251 address entry_point = __ pc();
252
253 if (VerifyMethodHandles) {
254 Label L;
255 BLOCK_COMMENT("verify_intrinsic_id {");
256
257 // Supplement to 8139891: _intrinsic_id exceeded 1-byte size limit.
258 if (Method::intrinsic_id_size_in_bytes() == 1) {
259 __ z_cli(Address(Z_method, Method::intrinsic_id_offset_in_bytes()), (int)iid);
260 } else {
261 assert(Method::intrinsic_id_size_in_bytes() == 2, "size error: check Method::_intrinsic_id");
262 __ z_lh(Z_R0_scratch, Address(Z_method, Method::intrinsic_id_offset_in_bytes()));
263 __ z_chi(Z_R0_scratch, (int)iid);
264 }
265 __ z_bre(L);
266
267 if (iid == vmIntrinsics::_linkToVirtual || iid == vmIntrinsics::_linkToSpecial) {
268 // Could do this for all kinds, but would explode assembly code size.
269 trace_method_handle(_masm, "bad Method::intrinsic_id");
270 }
271
272 __ stop("bad Method::intrinsic_id");
273 __ bind(L);
274
275 BLOCK_COMMENT("} verify_intrinsic_id");
276 }
277
278 // First task: Find out how big the argument list is.
279 Address Z_R4_first_arg_addr;
280 int ref_kind = signature_polymorphic_intrinsic_ref_kind(iid);
281
282 assert(ref_kind != 0 || iid == vmIntrinsics::_invokeBasic,
283 "must be _invokeBasic or a linkTo intrinsic");
284
285 if (ref_kind == 0 || MethodHandles::ref_kind_has_receiver(ref_kind)) {
286 Address paramSize(Z_R1_scratch, ConstMethod::size_of_parameters_offset());
287
288 __ z_lg(Z_R1_scratch, Address(Z_method, Method::const_offset()));
289 __ load_sized_value(Z_R4_param_size, paramSize, sizeof(u2), /*is_signed*/ false);
290 Z_R4_first_arg_addr = __ argument_address(Z_R4_param_size, Z_R4_param_size, 0);
291 } else {
292 DEBUG_ONLY(Z_R4_param_size = noreg);
293 }
294
295 Register Z_mh = noreg;
296 if (!is_signature_polymorphic_static(iid)) {
297 Z_mh = Z_ARG4;
298 __ z_lg(Z_mh, Z_R4_first_arg_addr);
299 DEBUG_ONLY(Z_R4_param_size = noreg);
300 }
301
302 // Z_R4_first_arg_addr is live!
303
304 trace_method_handle_interpreter_entry(_masm, iid);
305
306 if (iid == vmIntrinsics::_invokeBasic) {
307 __ pc(); // just for the block comment
308 generate_method_handle_dispatch(_masm, iid, Z_mh, noreg, not_for_compiler_entry);
309 } else {
310 // Adjust argument list by popping the trailing MemberName argument.
311 Register Z_recv = noreg;
312
313 if (MethodHandles::ref_kind_has_receiver(ref_kind)) {
314 // Load the receiver (not the MH; the actual MemberName's receiver)
315 // up from the interpreter stack.
316 __ z_lg(Z_recv = Z_R5, Z_R4_first_arg_addr);
317 DEBUG_ONLY(Z_R4_param_size = noreg);
318 }
319
320 Register Z_member = Z_method; // MemberName ptr; incoming method ptr is dead now
321
322 __ z_lg(Z_member, __ argument_address(constant(1)));
323 __ add2reg(Z_esp, Interpreter::stackElementSize);
324 generate_method_handle_dispatch(_masm, iid, Z_recv, Z_member, not_for_compiler_entry);
325 }
326
327 return entry_point;
328 }
329
330 void MethodHandles::generate_method_handle_dispatch(MacroAssembler* _masm,
331 vmIntrinsics::ID iid,
332 Register receiver_reg,
333 Register member_reg,
334 bool for_compiler_entry) {
335 assert(is_signature_polymorphic(iid), "expected invoke iid");
336
337 Register temp1 = for_compiler_entry ? Z_R10 : Z_R6;
338 Register temp2 = Z_R12;
339 Register temp3 = Z_R11;
340 Register temp4 = Z_R13;
341
342 if (for_compiler_entry) {
343 assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : Z_ARG1),
344 "only valid assignment");
345 }
346 if (receiver_reg != noreg) {
347 assert_different_registers(temp1, temp2, temp3, temp4, receiver_reg);
348 }
349 if (member_reg != noreg) {
350 assert_different_registers(temp1, temp2, temp3, temp4, member_reg);
351 }
352 if (!for_compiler_entry) { // Don't trash last SP.
353 assert_different_registers(temp1, temp2, temp3, temp4, Z_R10);
354 }
355
356 if (iid == vmIntrinsics::_invokeBasic) {
357 __ pc(); // Just for the block comment.
358 // Indirect through MH.form.vmentry.vmtarget.
359 jump_to_lambda_form(_masm, receiver_reg, Z_method, Z_R1, temp3, for_compiler_entry);
360 return;
361 }
362
363 // The method is a member invoker used by direct method handles.
364 if (VerifyMethodHandles) {
365 // Make sure the trailing argument really is a MemberName (caller responsibility).
366 verify_klass(_masm, member_reg,
367 SystemDictionary::WK_KLASS_ENUM_NAME(MemberName_klass),
368 temp1, temp2,
369 "MemberName required for invokeVirtual etc.");
370 }
371
372 Address member_clazz( member_reg, NONZERO(java_lang_invoke_MemberName::clazz_offset_in_bytes()));
373 Address member_vmindex( member_reg, NONZERO(java_lang_invoke_MemberName::vmindex_offset_in_bytes()));
374 Address member_vmtarget(member_reg, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes()));
375 Register temp1_recv_klass = temp1;
376
377 if (iid != vmIntrinsics::_linkToStatic) {
378 __ verify_oop(receiver_reg);
379 if (iid == vmIntrinsics::_linkToSpecial) {
380 // Don't actually load the klass; just null-check the receiver.
381 __ null_check(receiver_reg);
382 } else {
383 // Load receiver klass itself.
384 __ null_check(receiver_reg, Z_R0, oopDesc::klass_offset_in_bytes());
385 __ load_klass(temp1_recv_klass, receiver_reg);
386 __ verify_klass_ptr(temp1_recv_klass);
387 }
388 BLOCK_COMMENT("check_receiver {");
389 // The receiver for the MemberName must be in receiver_reg.
390 // Check the receiver against the MemberName.clazz.
391 if (VerifyMethodHandles && iid == vmIntrinsics::_linkToSpecial) {
392 // Did not load it above...
393 __ load_klass(temp1_recv_klass, receiver_reg);
394 __ verify_klass_ptr(temp1_recv_klass);
395 }
396
397 if (VerifyMethodHandles && iid != vmIntrinsics::_linkToInterface) {
398 NearLabel L_ok;
399 Register temp2_defc = temp2;
400
401 __ load_heap_oop(temp2_defc, member_clazz);
402 load_klass_from_Class(_masm, temp2_defc, temp3, temp4);
403 __ verify_klass_ptr(temp2_defc);
404 __ check_klass_subtype(temp1_recv_klass, temp2_defc, temp3, temp4, L_ok);
405 // If we get here, the type check failed!
406 __ stop("receiver class disagrees with MemberName.clazz");
407 __ bind(L_ok);
408 }
409 BLOCK_COMMENT("} check_receiver");
410 }
411 if (iid == vmIntrinsics::_linkToSpecial || iid == vmIntrinsics::_linkToStatic) {
412 DEBUG_ONLY(temp1_recv_klass = noreg); // These guys didn't load the recv_klass.
413 }
414
415 // Live registers at this point:
416 // member_reg - MemberName that was the trailing argument.
417 // temp1_recv_klass - Klass of stacked receiver, if needed.
418 // Z_R10 - Interpreter linkage if interpreted.
419
420 bool method_is_live = false;
421
422 switch (iid) {
423 case vmIntrinsics::_linkToSpecial:
424 if (VerifyMethodHandles) {
425 verify_ref_kind(_masm, JVM_REF_invokeSpecial, member_reg, temp3);
426 }
427 __ z_lg(Z_method, member_vmtarget);
428 method_is_live = true;
429 break;
430
431 case vmIntrinsics::_linkToStatic:
432 if (VerifyMethodHandles) {
433 verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp3);
434 }
435 __ z_lg(Z_method, member_vmtarget);
436 method_is_live = true;
437 break;
438
439 case vmIntrinsics::_linkToVirtual: {
440 // Same as TemplateTable::invokevirtual, minus the CP setup and profiling.
441 if (VerifyMethodHandles) {
442 verify_ref_kind(_masm, JVM_REF_invokeVirtual, member_reg, temp3);
443 }
444
445 // Pick out the vtable index from the MemberName, and then we can discard it.
446 Register temp2_index = temp2;
447 __ z_lg(temp2_index, member_vmindex);
448
449 if (VerifyMethodHandles) {
450 // if (member_vmindex < 0) stop
451 NearLabel L_index_ok;
452 __ compare32_and_branch(temp2_index, constant(0), Assembler::bcondNotLow, L_index_ok);
453 __ stop("no virtual index");
454 __ BIND(L_index_ok);
455 }
456
457 // Note: The verifier invariants allow us to ignore MemberName.clazz and vmtarget
458 // at this point. And VerifyMethodHandles has already checked clazz, if needed.
459
460 // Get target method and entry point.
461 __ lookup_virtual_method(temp1_recv_klass, temp2_index, Z_method);
462 method_is_live = true;
463 break;
464 }
465
466 case vmIntrinsics::_linkToInterface: {
467 // Same as TemplateTable::invokeinterface, minus the CP setup
468 // and profiling, with different argument motion.
469 if (VerifyMethodHandles) {
470 verify_ref_kind(_masm, JVM_REF_invokeInterface, member_reg, temp3);
471 }
472
473 Register temp3_intf = temp3;
474
475 __ load_heap_oop(temp3_intf, member_clazz);
476 load_klass_from_Class(_masm, temp3_intf, temp2, temp4);
477
478 Register Z_index = Z_method;
479
480 __ z_lg(Z_index, member_vmindex);
481
482 if (VerifyMethodHandles) {
483 NearLabel L;
484 // if (member_vmindex < 0) stop
485 __ compare32_and_branch(Z_index, constant(0), Assembler::bcondNotLow, L);
486 __ stop("invalid vtable index for MH.invokeInterface");
487 __ bind(L);
488 }
489
490 // Given interface, index, and recv klass, dispatch to the implementation method.
491 Label L_no_such_interface;
492 __ lookup_interface_method(temp1_recv_klass, temp3_intf,
493 // Note: next two args must be the same:
494 Z_index, Z_method, temp2, noreg,
495 L_no_such_interface);
496 jump_from_method_handle(_masm, Z_method, temp2, Z_R0, for_compiler_entry);
497
498 __ bind(L_no_such_interface);
499
500 // Throw exception.
501 __ load_const_optimized(Z_R1, StubRoutines::throw_IncompatibleClassChangeError_entry());
502 __ z_br(Z_R1);
503 break;
504 }
505
506 default:
507 fatal("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid));
508 break;
509 }
510
511 if (method_is_live) {
512 // Live at this point: Z_method, O5_savedSP (if interpreted).
513
514 // After figuring out which concrete method to call, jump into it.
515 // Note that this works in the interpreter with no data motion.
516 // But the compiled version will require that rcx_recv be shifted out.
517 jump_from_method_handle(_masm, Z_method, temp1, Z_R0, for_compiler_entry);
518 }
519 }
520
521 #ifndef PRODUCT
522 void trace_method_handle_stub(const char* adaptername,
523 oopDesc* mh,
524 intptr_t* sender_sp,
525 intptr_t* args,
526 intptr_t* tracing_fp) {
527 bool has_mh = (strstr(adaptername, "/static") == NULL &&
528 strstr(adaptername, "linkTo") == NULL); // Static linkers don't have MH.
529 const char* mh_reg_name = has_mh ? "Z_R4_mh" : "Z_R4";
530 tty->print_cr("MH %s %s=" INTPTR_FORMAT " sender_sp=" INTPTR_FORMAT " args=" INTPTR_FORMAT,
531 adaptername, mh_reg_name,
532 p2i(mh), p2i(sender_sp), p2i(args));
533
534 if (Verbose) {
535 // Dumping last frame with frame::describe.
536
537 JavaThread* p = JavaThread::active();
538
539 ResourceMark rm;
540 PRESERVE_EXCEPTION_MARK; // May not be needed by safer and unexpensive here.
541 FrameValues values;
542
543 // Note: We want to allow trace_method_handle from any call site.
544 // While trace_method_handle creates a frame, it may be entered
545 // without a valid return PC in Z_R14 (e.g. not just after a call).
546 // Walking that frame could lead to failures due to that invalid PC.
547 // => carefully detect that frame when doing the stack walking.
548
549 // Walk up to the right frame using the "tracing_fp" argument.
550 frame cur_frame = os::current_frame(); // Current C frame.
551
552 while (cur_frame.fp() != tracing_fp) {
553 cur_frame = os::get_sender_for_C_frame(&cur_frame);
554 }
555
556 // Safely create a frame and call frame::describe.
557 intptr_t *dump_sp = cur_frame.sender_sp();
558 intptr_t *dump_fp = cur_frame.link();
559
560 bool walkable = has_mh; // Whether the traced frame shoud be walkable.
561
562 // The sender for cur_frame is the caller of trace_method_handle.
563 if (walkable) {
564 // The previous definition of walkable may have to be refined
565 // if new call sites cause the next frame constructor to start
566 // failing. Alternatively, frame constructors could be
567 // modified to support the current or future non walkable
568 // frames (but this is more intrusive and is not considered as
569 // part of this RFE, which will instead use a simpler output).
570 frame dump_frame = frame(dump_sp);
571 dump_frame.describe(values, 1);
572 } else {
573 // Robust dump for frames which cannot be constructed from sp/younger_sp
574 // Add descriptions without building a Java frame to avoid issues.
575 values.describe(-1, dump_fp, "fp for #1 <not parsed, cannot trust pc>");
576 values.describe(-1, dump_sp, "sp");
577 }
578
579 bool has_args = has_mh; // Whether Z_esp is meaningful.
580
581 // Mark args, if seems valid (may not be valid for some adapters).
582 if (has_args) {
583 if ((args >= dump_sp) && (args < dump_fp)) {
584 values.describe(-1, args, "*Z_esp");
585 }
586 }
587
588 // Note: the unextended_sp may not be correct.
589 tty->print_cr(" stack layout:");
590 values.print(p);
591 if (has_mh && mh->is_oop()) {
592 mh->print();
593 if (java_lang_invoke_MethodHandle::is_instance(mh)) {
594 if (java_lang_invoke_MethodHandle::form_offset_in_bytes() != 0) {
595 java_lang_invoke_MethodHandle::form(mh)->print();
596 }
597 }
598 }
599 }
600 }
601
602 void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) {
603 if (!TraceMethodHandles) { return; }
604
605 BLOCK_COMMENT("trace_method_handle {");
606
607 // Save argument registers (they are used in raise exception stub).
608 __ z_stg(Z_ARG1, Address(Z_SP, 16));
609 __ z_stg(Z_ARG2, Address(Z_SP, 24));
610 __ z_stg(Z_ARG3, Address(Z_SP, 32));
611 __ z_stg(Z_ARG4, Address(Z_SP, 40));
612 __ z_stg(Z_ARG5, Address(Z_SP, 48));
613
614 // Setup arguments.
615 __ z_lgr(Z_ARG2, Z_ARG4); // mh, see generate_method_handle_interpreter_entry()
616 __ z_lgr(Z_ARG3, Z_R10); // sender_sp
617 __ z_lgr(Z_ARG4, Z_esp);
618 __ load_const_optimized(Z_ARG1, (void *)adaptername);
619 __ z_lgr(Z_ARG5, Z_SP); // tracing_fp
620 __ save_return_pc(); // saves Z_R14
621 __ push_frame_abi160(0);
622 __ call_VM_leaf(CAST_FROM_FN_PTR(address, trace_method_handle_stub));
623 __ pop_frame();
624 __ restore_return_pc(); // restores to Z_R14
625 __ z_lg(Z_ARG1, Address(Z_SP, 16));
626 __ z_lg(Z_ARG2, Address(Z_SP, 24));
627 __ z_lg(Z_ARG3, Address(Z_SP, 32));
628 __ z_lg(Z_ARG4, Address(Z_SP, 40));
629 __ z_lg(Z_ARG5, Address(Z_SP, 45));
630 __ zap_from_to(Z_SP, Z_SP, Z_R0, Z_R1, 50, -1);
631 __ zap_from_to(Z_SP, Z_SP, Z_R0, Z_R1, -1, 5);
632
633 BLOCK_COMMENT("} trace_method_handle");
634 }
635 #endif // !PRODUCT