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