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 __ load_heap_oop(method_temp,
204 Address(method_temp,
205 NONZERO(java_lang_invoke_MemberName::method_offset_in_bytes())));
206 __ verify_oop(method_temp);
207 __ z_lg(method_temp,
208 Address(method_temp,
209 NONZERO(java_lang_invoke_ResolvedMethodName::vmtarget_offset_in_bytes())));
210
211 if (VerifyMethodHandles && !for_compiler_entry) {
212 // Make sure recv is already on stack.
213 NearLabel L;
214 Address paramSize(temp2, ConstMethod::size_of_parameters_offset());
215
216 __ z_lg(temp2, Address(method_temp, Method::const_offset()));
217 __ load_sized_value(temp2, paramSize, sizeof(u2), /*is_signed*/ false);
218 // if (temp2 != recv) stop
219 __ z_lg(temp2, __ argument_address(temp2, temp2, 0));
220 __ compare64_and_branch(temp2, recv, Assembler::bcondEqual, L);
221 __ stop("receiver not on stack");
222 __ BIND(L);
223 }
224
225 jump_from_method_handle(_masm, method_temp, temp2, Z_R0, for_compiler_entry);
226
227 BLOCK_COMMENT("} jump_to_lambda_form");
228 }
229
230 // code generation
231 address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* _masm,
232 vmIntrinsics::ID iid) {
233 const bool not_for_compiler_entry = false; // This is the interpreter entry.
234 assert(is_signature_polymorphic(iid), "expected invoke iid");
235
236 if (iid == vmIntrinsics::_invokeGeneric || iid == vmIntrinsics::_compiledLambdaForm) {
237 // Perhaps surprisingly, the symbolic references visible to Java
238 // are not directly used. They are linked to Java-generated
239 // adapters via MethodHandleNatives.linkMethod. They all allow an
240 // appendix argument.
241 __ should_not_reach_here(); // Empty stubs make SG sick.
242 return NULL;
243 }
244
245 // Z_R10: sender SP (must preserve; see prepare_to_jump_from_interprted)
246 // Z_method: method
247 // Z_ARG1 (Gargs): incoming argument list (must preserve)
248 Register Z_R4_param_size = Z_R4; // size of parameters
249 address code_start = __ pc();
250
251 // Here is where control starts out:
252 __ align(CodeEntryAlignment);
253
254 address entry_point = __ pc();
255
256 if (VerifyMethodHandles) {
257 Label L;
258 BLOCK_COMMENT("verify_intrinsic_id {");
259
260 // Supplement to 8139891: _intrinsic_id exceeded 1-byte size limit.
261 if (Method::intrinsic_id_size_in_bytes() == 1) {
262 __ z_cli(Address(Z_method, Method::intrinsic_id_offset_in_bytes()), (int)iid);
263 } else {
264 assert(Method::intrinsic_id_size_in_bytes() == 2, "size error: check Method::_intrinsic_id");
265 __ z_lh(Z_R0_scratch, Address(Z_method, Method::intrinsic_id_offset_in_bytes()));
266 __ z_chi(Z_R0_scratch, (int)iid);
267 }
268 __ z_bre(L);
269
270 if (iid == vmIntrinsics::_linkToVirtual || iid == vmIntrinsics::_linkToSpecial) {
271 // Could do this for all kinds, but would explode assembly code size.
272 trace_method_handle(_masm, "bad Method::intrinsic_id");
273 }
274
275 __ stop("bad Method::intrinsic_id");
276 __ bind(L);
277
278 BLOCK_COMMENT("} verify_intrinsic_id");
279 }
280
281 // First task: Find out how big the argument list is.
282 Address Z_R4_first_arg_addr;
283 int ref_kind = signature_polymorphic_intrinsic_ref_kind(iid);
284
285 assert(ref_kind != 0 || iid == vmIntrinsics::_invokeBasic,
286 "must be _invokeBasic or a linkTo intrinsic");
287
288 if (ref_kind == 0 || MethodHandles::ref_kind_has_receiver(ref_kind)) {
289 Address paramSize(Z_R1_scratch, ConstMethod::size_of_parameters_offset());
290
291 __ z_lg(Z_R1_scratch, Address(Z_method, Method::const_offset()));
292 __ load_sized_value(Z_R4_param_size, paramSize, sizeof(u2), /*is_signed*/ false);
293 Z_R4_first_arg_addr = __ argument_address(Z_R4_param_size, Z_R4_param_size, 0);
294 } else {
295 DEBUG_ONLY(Z_R4_param_size = noreg);
296 }
297
298 Register Z_mh = noreg;
299 if (!is_signature_polymorphic_static(iid)) {
300 Z_mh = Z_ARG4;
301 __ z_lg(Z_mh, Z_R4_first_arg_addr);
302 DEBUG_ONLY(Z_R4_param_size = noreg);
303 }
304
305 // Z_R4_first_arg_addr is live!
306
307 trace_method_handle_interpreter_entry(_masm, iid);
308
309 if (iid == vmIntrinsics::_invokeBasic) {
310 __ pc(); // just for the block comment
311 generate_method_handle_dispatch(_masm, iid, Z_mh, noreg, not_for_compiler_entry);
312 } else {
313 // Adjust argument list by popping the trailing MemberName argument.
314 Register Z_recv = noreg;
315
316 if (MethodHandles::ref_kind_has_receiver(ref_kind)) {
317 // Load the receiver (not the MH; the actual MemberName's receiver)
318 // up from the interpreter stack.
319 __ z_lg(Z_recv = Z_R5, Z_R4_first_arg_addr);
320 DEBUG_ONLY(Z_R4_param_size = noreg);
321 }
322
323 Register Z_member = Z_method; // MemberName ptr; incoming method ptr is dead now
324
325 __ z_lg(Z_member, __ argument_address(constant(1)));
326 __ add2reg(Z_esp, Interpreter::stackElementSize);
327 generate_method_handle_dispatch(_masm, iid, Z_recv, Z_member, not_for_compiler_entry);
328 }
329
330 return entry_point;
331 }
332
333 void MethodHandles::generate_method_handle_dispatch(MacroAssembler* _masm,
334 vmIntrinsics::ID iid,
335 Register receiver_reg,
336 Register member_reg,
337 bool for_compiler_entry) {
338 assert(is_signature_polymorphic(iid), "expected invoke iid");
339
340 Register temp1 = for_compiler_entry ? Z_R10 : Z_R6;
341 Register temp2 = Z_R12;
342 Register temp3 = Z_R11;
343 Register temp4 = Z_R13;
344
345 if (for_compiler_entry) {
346 assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : Z_ARG1),
347 "only valid assignment");
348 }
349 if (receiver_reg != noreg) {
350 assert_different_registers(temp1, temp2, temp3, temp4, receiver_reg);
351 }
352 if (member_reg != noreg) {
353 assert_different_registers(temp1, temp2, temp3, temp4, member_reg);
354 }
355 if (!for_compiler_entry) { // Don't trash last SP.
356 assert_different_registers(temp1, temp2, temp3, temp4, Z_R10);
357 }
358
359 if (iid == vmIntrinsics::_invokeBasic) {
360 __ pc(); // Just for the block comment.
361 // Indirect through MH.form.vmentry.vmtarget.
362 jump_to_lambda_form(_masm, receiver_reg, Z_method, Z_R1, temp3, for_compiler_entry);
363 return;
364 }
365
366 // The method is a member invoker used by direct method handles.
367 if (VerifyMethodHandles) {
368 // Make sure the trailing argument really is a MemberName (caller responsibility).
369 verify_klass(_masm, member_reg,
370 SystemDictionary::WK_KLASS_ENUM_NAME(MemberName_klass),
371 temp1, temp2,
372 "MemberName required for invokeVirtual etc.");
373 }
374
375 Address member_clazz( member_reg, NONZERO(java_lang_invoke_MemberName::clazz_offset_in_bytes()));
376 Address member_vmindex( member_reg, NONZERO(java_lang_invoke_MemberName::vmindex_offset_in_bytes()));
377 Address member_vmtarget(member_reg, NONZERO(java_lang_invoke_MemberName::method_offset_in_bytes()));
378 Address vmtarget_method(Z_method, NONZERO(java_lang_invoke_ResolvedMethodName::vmtarget_offset_in_bytes()));
379 Register temp1_recv_klass = temp1;
380
381 if (iid != vmIntrinsics::_linkToStatic) {
382 __ verify_oop(receiver_reg);
383 if (iid == vmIntrinsics::_linkToSpecial) {
384 // Don't actually load the klass; just null-check the receiver.
385 __ null_check(receiver_reg);
386 } else {
387 // Load receiver klass itself.
388 __ null_check(receiver_reg, Z_R0, oopDesc::klass_offset_in_bytes());
389 __ load_klass(temp1_recv_klass, receiver_reg);
390 __ verify_klass_ptr(temp1_recv_klass);
391 }
392 BLOCK_COMMENT("check_receiver {");
393 // The receiver for the MemberName must be in receiver_reg.
394 // Check the receiver against the MemberName.clazz.
395 if (VerifyMethodHandles && iid == vmIntrinsics::_linkToSpecial) {
396 // Did not load it above...
397 __ load_klass(temp1_recv_klass, receiver_reg);
398 __ verify_klass_ptr(temp1_recv_klass);
399 }
400
401 if (VerifyMethodHandles && iid != vmIntrinsics::_linkToInterface) {
402 NearLabel L_ok;
403 Register temp2_defc = temp2;
404
405 __ load_heap_oop(temp2_defc, member_clazz);
406 load_klass_from_Class(_masm, temp2_defc, temp3, temp4);
407 __ verify_klass_ptr(temp2_defc);
408 __ check_klass_subtype(temp1_recv_klass, temp2_defc, temp3, temp4, L_ok);
409 // If we get here, the type check failed!
410 __ stop("receiver class disagrees with MemberName.clazz");
411 __ bind(L_ok);
412 }
413 BLOCK_COMMENT("} check_receiver");
414 }
415 if (iid == vmIntrinsics::_linkToSpecial || iid == vmIntrinsics::_linkToStatic) {
416 DEBUG_ONLY(temp1_recv_klass = noreg); // These guys didn't load the recv_klass.
417 }
418
419 // Live registers at this point:
420 // member_reg - MemberName that was the trailing argument.
421 // temp1_recv_klass - Klass of stacked receiver, if needed.
422 // Z_R10 - Interpreter linkage if interpreted.
423
424 bool method_is_live = false;
425
426 switch (iid) {
427 case vmIntrinsics::_linkToSpecial:
428 if (VerifyMethodHandles) {
429 verify_ref_kind(_masm, JVM_REF_invokeSpecial, member_reg, temp3);
430 }
431 __ load_heap_oop(Z_method, member_vmtarget);
432 __ z_lg(Z_method, vmtarget_method);
433 method_is_live = true;
434 break;
435
436 case vmIntrinsics::_linkToStatic:
437 if (VerifyMethodHandles) {
438 verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp3);
439 }
440 __ load_heap_oop(Z_method, member_vmtarget);
441 __ z_lg(Z_method, vmtarget_method);
442 method_is_live = true;
443 break;
444
445 case vmIntrinsics::_linkToVirtual: {
446 // Same as TemplateTable::invokevirtual, minus the CP setup and profiling.
447 if (VerifyMethodHandles) {
448 verify_ref_kind(_masm, JVM_REF_invokeVirtual, member_reg, temp3);
449 }
450
451 // Pick out the vtable index from the MemberName, and then we can discard it.
452 Register temp2_index = temp2;
453 __ z_lg(temp2_index, member_vmindex);
454
455 if (VerifyMethodHandles) {
456 // if (member_vmindex < 0) stop
457 NearLabel L_index_ok;
458 __ compare32_and_branch(temp2_index, constant(0), Assembler::bcondNotLow, L_index_ok);
459 __ stop("no virtual index");
460 __ BIND(L_index_ok);
461 }
462
463 // Note: The verifier invariants allow us to ignore MemberName.clazz and vmtarget
464 // at this point. And VerifyMethodHandles has already checked clazz, if needed.
465
466 // Get target method and entry point.
467 __ lookup_virtual_method(temp1_recv_klass, temp2_index, Z_method);
468 method_is_live = true;
469 break;
470 }
471
472 case vmIntrinsics::_linkToInterface: {
473 // Same as TemplateTable::invokeinterface, minus the CP setup
474 // and profiling, with different argument motion.
475 if (VerifyMethodHandles) {
476 verify_ref_kind(_masm, JVM_REF_invokeInterface, member_reg, temp3);
477 }
478
479 Register temp3_intf = temp3;
480
481 __ load_heap_oop(temp3_intf, member_clazz);
482 load_klass_from_Class(_masm, temp3_intf, temp2, temp4);
483
484 Register Z_index = Z_method;
485
486 __ z_lg(Z_index, member_vmindex);
487
488 if (VerifyMethodHandles) {
489 NearLabel L;
490 // if (member_vmindex < 0) stop
491 __ compare32_and_branch(Z_index, constant(0), Assembler::bcondNotLow, L);
492 __ stop("invalid vtable index for MH.invokeInterface");
493 __ bind(L);
494 }
495
496 // Given interface, index, and recv klass, dispatch to the implementation method.
497 Label L_no_such_interface;
498 __ lookup_interface_method(temp1_recv_klass, temp3_intf,
499 // Note: next two args must be the same:
500 Z_index, Z_method, temp2, noreg,
501 L_no_such_interface);
502 jump_from_method_handle(_masm, Z_method, temp2, Z_R0, for_compiler_entry);
503
504 __ bind(L_no_such_interface);
505
506 // Throw exception.
507 __ load_const_optimized(Z_R1, StubRoutines::throw_IncompatibleClassChangeError_entry());
508 __ z_br(Z_R1);
509 break;
510 }
511
512 default:
513 fatal("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid));
514 break;
515 }
516
517 if (method_is_live) {
518 // Live at this point: Z_method, O5_savedSP (if interpreted).
519
520 // After figuring out which concrete method to call, jump into it.
521 // Note that this works in the interpreter with no data motion.
522 // But the compiled version will require that rcx_recv be shifted out.
523 jump_from_method_handle(_masm, Z_method, temp1, Z_R0, for_compiler_entry);
524 }
525 }
526
527 #ifndef PRODUCT
528 void trace_method_handle_stub(const char* adaptername,
529 oopDesc* mh,
530 intptr_t* sender_sp,
531 intptr_t* args,
532 intptr_t* tracing_fp) {
533 bool has_mh = (strstr(adaptername, "/static") == NULL &&
534 strstr(adaptername, "linkTo") == NULL); // Static linkers don't have MH.
535 const char* mh_reg_name = has_mh ? "Z_R4_mh" : "Z_R4";
536 tty->print_cr("MH %s %s=" INTPTR_FORMAT " sender_sp=" INTPTR_FORMAT " args=" INTPTR_FORMAT,
537 adaptername, mh_reg_name,
538 p2i(mh), p2i(sender_sp), p2i(args));
539
540 if (Verbose) {
541 // Dumping last frame with frame::describe.
542
543 JavaThread* p = JavaThread::active();
544
545 ResourceMark rm;
546 PRESERVE_EXCEPTION_MARK; // May not be needed by safer and unexpensive here.
547 FrameValues values;
548
549 // Note: We want to allow trace_method_handle from any call site.
550 // While trace_method_handle creates a frame, it may be entered
551 // without a valid return PC in Z_R14 (e.g. not just after a call).
552 // Walking that frame could lead to failures due to that invalid PC.
553 // => carefully detect that frame when doing the stack walking.
554
555 // Walk up to the right frame using the "tracing_fp" argument.
556 frame cur_frame = os::current_frame(); // Current C frame.
557
558 while (cur_frame.fp() != tracing_fp) {
559 cur_frame = os::get_sender_for_C_frame(&cur_frame);
560 }
561
562 // Safely create a frame and call frame::describe.
563 intptr_t *dump_sp = cur_frame.sender_sp();
564 intptr_t *dump_fp = cur_frame.link();
565
566 bool walkable = has_mh; // Whether the traced frame shoud be walkable.
567
568 // The sender for cur_frame is the caller of trace_method_handle.
569 if (walkable) {
570 // The previous definition of walkable may have to be refined
571 // if new call sites cause the next frame constructor to start
572 // failing. Alternatively, frame constructors could be
573 // modified to support the current or future non walkable
574 // frames (but this is more intrusive and is not considered as
575 // part of this RFE, which will instead use a simpler output).
576 frame dump_frame = frame(dump_sp);
577 dump_frame.describe(values, 1);
578 } else {
579 // Robust dump for frames which cannot be constructed from sp/younger_sp
580 // Add descriptions without building a Java frame to avoid issues.
581 values.describe(-1, dump_fp, "fp for #1 <not parsed, cannot trust pc>");
582 values.describe(-1, dump_sp, "sp");
583 }
584
585 bool has_args = has_mh; // Whether Z_esp is meaningful.
586
587 // Mark args, if seems valid (may not be valid for some adapters).
588 if (has_args) {
589 if ((args >= dump_sp) && (args < dump_fp)) {
590 values.describe(-1, args, "*Z_esp");
591 }
592 }
593
594 // Note: the unextended_sp may not be correct.
595 tty->print_cr(" stack layout:");
596 values.print(p);
597 if (has_mh && mh->is_oop()) {
598 mh->print();
599 if (java_lang_invoke_MethodHandle::is_instance(mh)) {
600 if (java_lang_invoke_MethodHandle::form_offset_in_bytes() != 0) {
601 java_lang_invoke_MethodHandle::form(mh)->print();
602 }
603 }
604 }
605 }
606 }
607
608 void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) {
609 if (!TraceMethodHandles) { return; }
610
611 BLOCK_COMMENT("trace_method_handle {");
612
613 // Save argument registers (they are used in raise exception stub).
614 __ z_stg(Z_ARG1, Address(Z_SP, 16));
615 __ z_stg(Z_ARG2, Address(Z_SP, 24));
616 __ z_stg(Z_ARG3, Address(Z_SP, 32));
617 __ z_stg(Z_ARG4, Address(Z_SP, 40));
618 __ z_stg(Z_ARG5, Address(Z_SP, 48));
619
620 // Setup arguments.
621 __ z_lgr(Z_ARG2, Z_ARG4); // mh, see generate_method_handle_interpreter_entry()
622 __ z_lgr(Z_ARG3, Z_R10); // sender_sp
623 __ z_lgr(Z_ARG4, Z_esp);
624 __ load_const_optimized(Z_ARG1, (void *)adaptername);
625 __ z_lgr(Z_ARG5, Z_SP); // tracing_fp
626 __ save_return_pc(); // saves Z_R14
627 __ push_frame_abi160(0);
628 __ call_VM_leaf(CAST_FROM_FN_PTR(address, trace_method_handle_stub));
629 __ pop_frame();
630 __ restore_return_pc(); // restores to Z_R14
631 __ z_lg(Z_ARG1, Address(Z_SP, 16));
632 __ z_lg(Z_ARG2, Address(Z_SP, 24));
633 __ z_lg(Z_ARG3, Address(Z_SP, 32));
634 __ z_lg(Z_ARG4, Address(Z_SP, 40));
635 __ z_lg(Z_ARG5, Address(Z_SP, 45));
636 __ zap_from_to(Z_SP, Z_SP, Z_R0, Z_R1, 50, -1);
637 __ zap_from_to(Z_SP, Z_SP, Z_R0, Z_R1, -1, 5);
638
639 BLOCK_COMMENT("} trace_method_handle");
640 }
641 #endif // !PRODUCT