1 /*
2 * Copyright (c) 1997, 2022, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2012, 2021 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 "classfile/vmClasses.hpp"
31 #include "interpreter/interpreter.hpp"
32 #include "logging/log.hpp"
33 #include "logging/logStream.hpp"
34 #include "memory/allocation.inline.hpp"
35 #include "memory/resourceArea.hpp"
36 #include "prims/jvmtiExport.hpp"
37 #include "prims/methodHandles.hpp"
38 #include "runtime/frame.inline.hpp"
39 #include "runtime/stubRoutines.hpp"
40 #include "utilities/macros.hpp"
41 #include "utilities/preserveException.hpp"
42
43 #define __ _masm->
44
45 #ifdef PRODUCT
46 #define BLOCK_COMMENT(str) // nothing
47 #else
48 #define BLOCK_COMMENT(str) __ block_comment(str)
49 #endif
50
51 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":")
52
53 // Workaround for C++ overloading nastiness on '0' for RegisterOrConstant.
54 inline static RegisterOrConstant constant(int value) {
55 return RegisterOrConstant(value);
56 }
57
58 void MethodHandles::load_klass_from_Class(MacroAssembler* _masm, Register klass_reg,
59 Register temp_reg, Register temp2_reg) {
60 if (VerifyMethodHandles) {
61 verify_klass(_masm, klass_reg, VM_CLASS_ID(java_lang_Class),
62 temp_reg, temp2_reg, "MH argument is a Class");
63 }
64 __ ld(klass_reg, java_lang_Class::klass_offset(), klass_reg);
65 }
66
67 #ifdef ASSERT
68 static int check_nonzero(const char* xname, int x) {
69 assert(x != 0, "%s should be nonzero", xname);
70 return x;
71 }
72 #define NONZERO(x) check_nonzero(#x, x)
73 #else //ASSERT
74 #define NONZERO(x) (x)
75 #endif //ASSERT
76
77 #ifdef ASSERT
78 void MethodHandles::verify_klass(MacroAssembler* _masm,
79 Register obj_reg, vmClassID klass_id,
80 Register temp_reg, Register temp2_reg,
81 const char* error_message) {
82 InstanceKlass** klass_addr = vmClasses::klass_addr_at(klass_id);
83 Klass* klass = vmClasses::klass_at(klass_id);
84 Label L_ok, L_bad;
85 BLOCK_COMMENT("verify_klass {");
86 __ verify_oop(obj_reg, FILE_AND_LINE);
87 __ cmpdi(CCR0, obj_reg, 0);
88 __ beq(CCR0, L_bad);
89 __ load_klass(temp_reg, obj_reg);
90 __ load_const_optimized(temp2_reg, (address) klass_addr);
91 __ ld(temp2_reg, 0, temp2_reg);
92 __ cmpd(CCR0, temp_reg, temp2_reg);
93 __ beq(CCR0, L_ok);
94 __ ld(temp_reg, klass->super_check_offset(), temp_reg);
95 __ cmpd(CCR0, temp_reg, temp2_reg);
96 __ beq(CCR0, L_ok);
97 __ BIND(L_bad);
98 __ stop(error_message);
99 __ BIND(L_ok);
100 BLOCK_COMMENT("} verify_klass");
101 }
102
103 void MethodHandles::verify_ref_kind(MacroAssembler* _masm, int ref_kind, Register member_reg, Register temp) {
104 Label L;
105 BLOCK_COMMENT("verify_ref_kind {");
106 __ load_sized_value(temp, NONZERO(java_lang_invoke_MemberName::flags_offset()), member_reg,
107 sizeof(u4), /*is_signed*/ false);
108 // assert(sizeof(u4) == sizeof(java.lang.invoke.MemberName.flags), "");
109 __ srwi( temp, temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT);
110 __ andi(temp, temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK);
111 __ cmpwi(CCR1, temp, ref_kind);
112 __ beq(CCR1, L);
113 { char* buf = NEW_C_HEAP_ARRAY(char, 100, mtInternal);
114 jio_snprintf(buf, 100, "verify_ref_kind expected %x", ref_kind);
115 if (ref_kind == JVM_REF_invokeVirtual ||
116 ref_kind == JVM_REF_invokeSpecial)
117 // could do this for all ref_kinds, but would explode assembly code size
118 trace_method_handle(_masm, buf);
119 __ stop(buf);
120 }
121 BLOCK_COMMENT("} verify_ref_kind");
122 __ BIND(L);
123 }
124
125 #endif // ASSERT
126
127 void MethodHandles::jump_from_method_handle(MacroAssembler* _masm, Register method, Register target, Register temp,
128 bool for_compiler_entry) {
129 Label L_no_such_method;
130 assert(method == R19_method, "interpreter calling convention");
131 assert_different_registers(method, target, temp);
132
133 if (!for_compiler_entry && JvmtiExport::can_post_interpreter_events()) {
134 Label run_compiled_code;
135 // JVMTI events, such as single-stepping, are implemented partly by avoiding running
136 // compiled code in threads for which the event is enabled. Check here for
137 // interp_only_mode if these events CAN be enabled.
138 __ verify_thread();
139 __ lwz(temp, in_bytes(JavaThread::interp_only_mode_offset()), R16_thread);
140 __ cmplwi(CCR0, temp, 0);
141 __ beq(CCR0, run_compiled_code);
142 // Null method test is replicated below in compiled case,
143 // it might be able to address across the verify_thread()
144 __ cmplwi(CCR0, R19_method, 0);
145 __ beq(CCR0, L_no_such_method);
146 __ ld(target, in_bytes(Method::interpreter_entry_offset()), R19_method);
147 __ mtctr(target);
148 __ bctr();
149 __ BIND(run_compiled_code);
150 }
151
152 // Compiled case, either static or fall-through from runtime conditional
153 __ cmplwi(CCR0, R19_method, 0);
154 __ beq(CCR0, L_no_such_method);
155
156 const ByteSize entry_offset = for_compiler_entry ? Method::from_compiled_offset() :
157 Method::from_interpreted_offset();
158 __ ld(target, in_bytes(entry_offset), R19_method);
159 __ mtctr(target);
160 __ bctr();
161
162 __ bind(L_no_such_method);
163 assert(StubRoutines::throw_AbstractMethodError_entry() != NULL, "not yet generated!");
164 __ load_const_optimized(target, StubRoutines::throw_AbstractMethodError_entry());
165 __ mtctr(target);
166 __ bctr();
167 }
168
169
170 void MethodHandles::jump_to_lambda_form(MacroAssembler* _masm,
171 Register recv, Register method_temp,
172 Register temp2, Register temp3,
173 bool for_compiler_entry) {
174 BLOCK_COMMENT("jump_to_lambda_form {");
175 // This is the initial entry point of a lazy method handle.
176 // After type checking, it picks up the invoker from the LambdaForm.
177 assert_different_registers(recv, method_temp, temp2, temp3);
178 assert(method_temp == R19_method, "required register for loading method");
179
180 // Load the invoker, as MH -> MH.form -> LF.vmentry
181 __ verify_oop(recv, FILE_AND_LINE);
182
183 const MacroAssembler::PreservationLevel preservation_level = for_compiler_entry
184 ? MacroAssembler::PRESERVATION_FRAME_LR_GP_FP_REGS
185 : MacroAssembler::PRESERVATION_FRAME_LR;
186
187 __ load_heap_oop(method_temp, NONZERO(java_lang_invoke_MethodHandle::form_offset()), recv,
188 temp2, temp3, preservation_level, IS_NOT_NULL);
189 __ verify_oop(method_temp, FILE_AND_LINE);
190 __ load_heap_oop(method_temp, NONZERO(java_lang_invoke_LambdaForm::vmentry_offset()), method_temp,
191 temp2, temp3, preservation_level, IS_NOT_NULL);
192 __ verify_oop(method_temp, FILE_AND_LINE);
193 __ load_heap_oop(method_temp, NONZERO(java_lang_invoke_MemberName::method_offset()), method_temp,
194 temp2, temp3, preservation_level, IS_NOT_NULL);
195 __ verify_oop(method_temp, FILE_AND_LINE);
196 __ ld(method_temp, NONZERO(java_lang_invoke_ResolvedMethodName::vmtarget_offset()), method_temp);
197
198 if (VerifyMethodHandles && !for_compiler_entry) {
199 // Make sure recv is already on stack.
200 __ ld(temp2, in_bytes(Method::const_offset()), method_temp);
201 __ load_sized_value(temp2, in_bytes(ConstMethod::size_of_parameters_offset()), temp2,
202 sizeof(u2), /*is_signed*/ false);
203 // assert(sizeof(u2) == sizeof(ConstMethod::_size_of_parameters), "");
204 Label L;
205 __ ld(temp2, __ argument_offset(temp2, temp2, 0), R15_esp);
206 __ cmpd(CCR1, temp2, recv);
207 __ beq(CCR1, L);
208 __ stop("receiver not on stack");
209 __ BIND(L);
210 }
211
212 jump_from_method_handle(_masm, method_temp, temp2, temp3, for_compiler_entry);
213 BLOCK_COMMENT("} jump_to_lambda_form");
214 }
215
216
217
218 // Code generation
219 address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* _masm,
220 vmIntrinsics::ID iid) {
221 const bool not_for_compiler_entry = false; // this is the interpreter entry
222 assert(is_signature_polymorphic(iid), "expected invoke iid");
223 if (iid == vmIntrinsics::_invokeGeneric ||
224 iid == vmIntrinsics::_compiledLambdaForm) {
225 // Perhaps surprisingly, the symbolic references visible to Java are not directly used.
226 // They are linked to Java-generated adapters via MethodHandleNatives.linkMethod.
227 // They all allow an appendix argument.
228 __ stop("Should not reach here"); // empty stubs make SG sick
229 return NULL;
230 }
231
232 // No need in interpreter entry for linkToNative for now.
233 // Interpreter calls compiled entry through i2c.
234 if (iid == vmIntrinsics::_linkToNative) {
235 __ stop("Should not reach here"); // empty stubs make SG sick
236 return NULL;
237 }
238
239 Register R15_argbase = R15_esp; // parameter (preserved)
240 Register R30_tmp1 = R30;
241 Register R7_param_size = R7;
242
243 // here's where control starts out:
244 __ align(CodeEntryAlignment);
245 address entry_point = __ pc();
246
247 if (VerifyMethodHandles) {
248 assert(Method::intrinsic_id_size_in_bytes() == 2, "assuming Method::_intrinsic_id is u2");
249
250 Label L;
251 BLOCK_COMMENT("verify_intrinsic_id {");
252 __ load_sized_value(R30_tmp1, Method::intrinsic_id_offset_in_bytes(), R19_method,
253 sizeof(u2), /*is_signed*/ false);
254 __ cmpwi(CCR1, R30_tmp1, (int) iid);
255 __ beq(CCR1, L);
256 if (iid == vmIntrinsics::_linkToVirtual ||
257 iid == vmIntrinsics::_linkToSpecial) {
258 // could do this for all kinds, but would explode assembly code size
259 trace_method_handle(_masm, "bad Method*:intrinsic_id");
260 }
261 __ stop("bad Method*::intrinsic_id");
262 __ BIND(L);
263 BLOCK_COMMENT("} verify_intrinsic_id");
264 }
265
266 // First task: Find out how big the argument list is.
267 int ref_kind = signature_polymorphic_intrinsic_ref_kind(iid);
268 assert(ref_kind != 0 || iid == vmIntrinsics::_invokeBasic, "must be _invokeBasic or a linkTo intrinsic");
269 if (ref_kind == 0 || MethodHandles::ref_kind_has_receiver(ref_kind)) {
270 __ ld(R7_param_size, in_bytes(Method::const_offset()), R19_method);
271 __ load_sized_value(R7_param_size, in_bytes(ConstMethod::size_of_parameters_offset()), R7_param_size,
272 sizeof(u2), /*is_signed*/ false);
273 // assert(sizeof(u2) == sizeof(ConstMethod::_size_of_parameters), "");
274 } else {
275 DEBUG_ONLY(R7_param_size = noreg);
276 }
277
278 Register tmp_mh = noreg;
279 if (!is_signature_polymorphic_static(iid)) {
280 __ ld(tmp_mh = R30_tmp1, __ argument_offset(R7_param_size, R7_param_size, 0), R15_argbase);
281 DEBUG_ONLY(R7_param_size = noreg);
282 }
283
284 if (log_is_enabled(Info, methodhandles)) {
285 if (tmp_mh != noreg) {
286 __ mr(R23_method_handle, tmp_mh); // make stub happy
287 }
288 trace_method_handle_interpreter_entry(_masm, iid);
289 }
290
291 if (iid == vmIntrinsics::_invokeBasic) {
292 generate_method_handle_dispatch(_masm, iid, tmp_mh, noreg, not_for_compiler_entry);
293
294 } else {
295 // Adjust argument list by popping the trailing MemberName argument.
296 Register tmp_recv = noreg;
297 if (MethodHandles::ref_kind_has_receiver(ref_kind)) {
298 // Load the receiver (not the MH; the actual MemberName's receiver) up from the interpreter stack.
299 __ ld(tmp_recv = R30_tmp1, __ argument_offset(R7_param_size, R7_param_size, 0), R15_argbase);
300 DEBUG_ONLY(R7_param_size = noreg);
301 }
302 Register R19_member = R19_method; // MemberName ptr; incoming method ptr is dead now
303 __ ld(R19_member, RegisterOrConstant((intptr_t)8), R15_argbase);
304 __ add(R15_argbase, Interpreter::stackElementSize, R15_argbase);
305 generate_method_handle_dispatch(_masm, iid, tmp_recv, R19_member, not_for_compiler_entry);
306 }
307
308 return entry_point;
309 }
310
311 void MethodHandles::generate_method_handle_dispatch(MacroAssembler* _masm,
312 vmIntrinsics::ID iid,
313 Register receiver_reg,
314 Register member_reg,
315 bool for_compiler_entry) {
316 assert(is_signature_polymorphic(iid), "expected invoke iid");
317 Register temp1 = (for_compiler_entry ? R25_tmp5 : R31); // must be non-volatile due to runtime calls
318 Register temp2 = (for_compiler_entry ? R22_tmp2 : R8);
319 Register temp3 = (for_compiler_entry ? R23_tmp3 : R9);
320 Register temp4 = (for_compiler_entry ? R24_tmp4 : R10);
321 if (receiver_reg != noreg) assert_different_registers(temp1, temp2, temp3, temp4, receiver_reg);
322 if (member_reg != noreg) assert_different_registers(temp1, temp2, temp3, temp4, member_reg);
323
324 const MacroAssembler::PreservationLevel preservation_level = for_compiler_entry
325 ? MacroAssembler::PRESERVATION_FRAME_LR_GP_FP_REGS
326 : MacroAssembler::PRESERVATION_FRAME_LR;
327
328 if (iid == vmIntrinsics::_invokeBasic || iid == vmIntrinsics::_linkToNative) {
329 if (iid == vmIntrinsics::_linkToNative) {
330 assert(for_compiler_entry, "only compiler entry is supported");
331 }
332 // indirect through MH.form.vmentry.vmtarget
333 jump_to_lambda_form(_masm, receiver_reg, R19_method, temp1, temp2, for_compiler_entry);
334 } else {
335 // The method is a member invoker used by direct method handles.
336 if (VerifyMethodHandles) {
337 // make sure the trailing argument really is a MemberName (caller responsibility)
338 verify_klass(_masm, member_reg, VM_CLASS_ID(MemberName_klass),
339 temp1, temp2,
340 "MemberName required for invokeVirtual etc.");
341 }
342
343 Register temp1_recv_klass = temp1;
344 if (iid != vmIntrinsics::_linkToStatic) {
345 BLOCK_COMMENT("check_receiver {");
346 __ verify_oop(receiver_reg, FILE_AND_LINE);
347
348 const int klass_offset = iid == vmIntrinsics::_linkToSpecial
349 ? -1 // enforce receiver null check
350 : oopDesc::klass_offset_in_bytes(); // regular null-checking behavior
351
352 __ null_check_throw(receiver_reg, klass_offset, temp1, Interpreter::throw_NullPointerException_entry());
353
354 if (iid != vmIntrinsics::_linkToSpecial || VerifyMethodHandles) {
355 __ load_klass(temp1_recv_klass, receiver_reg);
356 __ verify_klass_ptr(temp1_recv_klass);
357 }
358
359 if (VerifyMethodHandles && iid != vmIntrinsics::_linkToInterface) {
360 Label L_ok;
361 Register temp2_defc = temp2;
362
363 __ load_heap_oop(temp2_defc, NONZERO(java_lang_invoke_MemberName::clazz_offset()), member_reg,
364 temp3, temp4, preservation_level, IS_NOT_NULL);
365 load_klass_from_Class(_masm, temp2_defc, temp3, temp4);
366 __ verify_klass_ptr(temp2_defc);
367 __ check_klass_subtype(temp1_recv_klass, temp2_defc, temp3, temp4, L_ok);
368 // If we get here, the type check failed!
369 __ stop("receiver class disagrees with MemberName.clazz");
370 __ BIND(L_ok);
371 }
372 BLOCK_COMMENT("} check_receiver");
373 }
374 if (iid == vmIntrinsics::_linkToSpecial ||
375 iid == vmIntrinsics::_linkToStatic) {
376 DEBUG_ONLY(temp1_recv_klass = noreg); // these guys didn't load the recv_klass
377 }
378
379 // Live registers at this point:
380 // member_reg - MemberName that was the trailing argument
381 // temp1_recv_klass - klass of stacked receiver, if needed
382
383 Label L_incompatible_class_change_error;
384 switch (iid) {
385 case vmIntrinsics::_linkToSpecial:
386 if (VerifyMethodHandles) {
387 verify_ref_kind(_masm, JVM_REF_invokeSpecial, member_reg, temp2);
388 }
389 __ load_heap_oop(R19_method, NONZERO(java_lang_invoke_MemberName::method_offset()), member_reg,
390 temp3, temp4, preservation_level, IS_NOT_NULL);
391 __ ld(R19_method, NONZERO(java_lang_invoke_ResolvedMethodName::vmtarget_offset()), R19_method);
392 break;
393
394 case vmIntrinsics::_linkToStatic:
395 if (VerifyMethodHandles) {
396 verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp2);
397 }
398 __ load_heap_oop(R19_method, NONZERO(java_lang_invoke_MemberName::method_offset()), member_reg,
399 temp3, temp4, preservation_level, IS_NOT_NULL);
400 __ ld(R19_method, NONZERO(java_lang_invoke_ResolvedMethodName::vmtarget_offset()), R19_method);
401 break;
402
403 case vmIntrinsics::_linkToVirtual:
404 {
405 // same as TemplateTable::invokevirtual,
406 // minus the CP setup and profiling:
407
408 if (VerifyMethodHandles) {
409 verify_ref_kind(_masm, JVM_REF_invokeVirtual, member_reg, temp2);
410 }
411
412 // pick out the vtable index from the MemberName, and then we can discard it:
413 Register temp2_index = temp2;
414 __ ld(temp2_index, NONZERO(java_lang_invoke_MemberName::vmindex_offset()), member_reg);
415
416 if (VerifyMethodHandles) {
417 Label L_index_ok;
418 __ cmpdi(CCR1, temp2_index, 0);
419 __ bge(CCR1, L_index_ok);
420 __ stop("no virtual index");
421 __ BIND(L_index_ok);
422 }
423
424 // Note: The verifier invariants allow us to ignore MemberName.clazz and vmtarget
425 // at this point. And VerifyMethodHandles has already checked clazz, if needed.
426
427 // get target Method* & entry point
428 __ lookup_virtual_method(temp1_recv_klass, temp2_index, R19_method);
429 break;
430 }
431
432 case vmIntrinsics::_linkToInterface:
433 {
434 // same as TemplateTable::invokeinterface
435 // (minus the CP setup and profiling, with different argument motion)
436 if (VerifyMethodHandles) {
437 verify_ref_kind(_masm, JVM_REF_invokeInterface, member_reg, temp2);
438 }
439
440 Register temp2_intf = temp2;
441 __ load_heap_oop(temp2_intf, NONZERO(java_lang_invoke_MemberName::clazz_offset()), member_reg,
442 temp3, temp4, preservation_level, IS_NOT_NULL);
443 load_klass_from_Class(_masm, temp2_intf, temp3, temp4);
444 __ verify_klass_ptr(temp2_intf);
445
446 Register vtable_index = R19_method;
447 __ ld(vtable_index, NONZERO(java_lang_invoke_MemberName::vmindex_offset()), member_reg);
448 if (VerifyMethodHandles) {
449 Label L_index_ok;
450 __ cmpdi(CCR1, vtable_index, 0);
451 __ bge(CCR1, L_index_ok);
452 __ stop("invalid vtable index for MH.invokeInterface");
453 __ BIND(L_index_ok);
454 }
455
456 // given intf, index, and recv klass, dispatch to the implementation method
457 __ lookup_interface_method(temp1_recv_klass, temp2_intf,
458 // note: next two args must be the same:
459 vtable_index, R19_method,
460 temp3, temp4,
461 L_incompatible_class_change_error);
462 break;
463 }
464
465 default:
466 fatal("unexpected intrinsic %d: %s", vmIntrinsics::as_int(iid), vmIntrinsics::name_at(iid));
467 break;
468 }
469
470 // Live at this point:
471 // R19_method
472
473 // After figuring out which concrete method to call, jump into it.
474 // Note that this works in the interpreter with no data motion.
475 // But the compiled version will require that rcx_recv be shifted out.
476 __ verify_method_ptr(R19_method);
477 jump_from_method_handle(_masm, R19_method, temp1, temp2, for_compiler_entry);
478
479 if (iid == vmIntrinsics::_linkToInterface) {
480 __ BIND(L_incompatible_class_change_error);
481 __ load_const_optimized(temp1, StubRoutines::throw_IncompatibleClassChangeError_entry());
482 __ mtctr(temp1);
483 __ bctr();
484 }
485 }
486 }
487
488 #ifndef PRODUCT
489 void trace_method_handle_stub(const char* adaptername,
490 oopDesc* mh,
491 intptr_t* entry_sp,
492 intptr_t* saved_regs) {
493
494 bool has_mh = (strstr(adaptername, "/static") == NULL &&
495 strstr(adaptername, "linkTo") == NULL); // static linkers don't have MH
496 const char* mh_reg_name = has_mh ? "R23_method_handle" : "G23";
497 log_info(methodhandles)("MH %s %s=" INTPTR_FORMAT " sp=" INTPTR_FORMAT,
498 adaptername, mh_reg_name, p2i(mh), p2i(entry_sp));
499
500 LogTarget(Trace, methodhandles) lt;
501 if (lt.is_enabled()) {
502 ResourceMark rm;
503 LogStream ls(lt);
504 ls.print_cr("Registers:");
505 const int abi_offset = frame::abi_reg_args_size / 8;
506 for (int i = R3->encoding(); i <= R12->encoding(); i++) {
507 Register r = as_Register(i);
508 int count = i - R3->encoding();
509 // The registers are stored in reverse order on the stack (by save_volatile_gprs(R1_SP, abi_reg_args_size)).
510 ls.print("%3s=" PTR_FORMAT, r->name(), saved_regs[abi_offset + count]);
511 if ((count + 1) % 4 == 0) {
512 ls.cr();
513 } else {
514 ls.print(", ");
515 }
516 }
517 ls.cr();
518
519 {
520 // dumping last frame with frame::describe
521
522 JavaThread* p = JavaThread::active();
523
524 // may not be needed by safer and unexpensive here
525 PreserveExceptionMark pem(Thread::current());
526 FrameValues values;
527
528 // Note: We want to allow trace_method_handle from any call site.
529 // While trace_method_handle creates a frame, it may be entered
530 // without a PC on the stack top (e.g. not just after a call).
531 // Walking that frame could lead to failures due to that invalid PC.
532 // => carefully detect that frame when doing the stack walking
533
534 // Current C frame
535 frame cur_frame = os::current_frame();
536
537 // Robust search of trace_calling_frame (independent of inlining).
538 assert(cur_frame.sp() <= saved_regs, "registers not saved on stack ?");
539 frame trace_calling_frame = os::get_sender_for_C_frame(&cur_frame);
540 while (trace_calling_frame.fp() < saved_regs) {
541 trace_calling_frame = os::get_sender_for_C_frame(&trace_calling_frame);
542 }
543
544 // Safely create a frame and call frame::describe.
545 intptr_t *dump_sp = trace_calling_frame.sender_sp();
546
547 frame dump_frame = frame(dump_sp);
548 dump_frame.describe(values, 1);
549
550 values.describe(-1, saved_regs, "raw top of stack");
551
552 ls.print_cr("Stack layout:");
553 values.print_on(p, &ls);
554 }
555
556 if (has_mh && oopDesc::is_oop(mh)) {
557 mh->print_on(&ls);
558 if (java_lang_invoke_MethodHandle::is_instance(mh)) {
559 java_lang_invoke_MethodHandle::form(mh)->print_on(&ls);
560 }
561 }
562 }
563 }
564
565 void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) {
566 if (!log_is_enabled(Info, methodhandles)) return;
567
568 BLOCK_COMMENT("trace_method_handle {");
569
570 const Register tmp = R11; // Will be preserved.
571 const int nbytes_save = MacroAssembler::num_volatile_regs * 8;
572 __ save_volatile_gprs(R1_SP, -nbytes_save); // except R0
573 __ save_LR_CR(tmp); // save in old frame
574
575 __ mr(R5_ARG3, R1_SP); // saved_sp
576 __ push_frame_reg_args(nbytes_save, tmp);
577
578 __ load_const_optimized(R3_ARG1, (address)adaptername, tmp);
579 __ mr(R4_ARG2, R23_method_handle);
580 __ mr(R6_ARG4, R1_SP);
581 __ call_VM_leaf(CAST_FROM_FN_PTR(address, trace_method_handle_stub));
582
583 __ pop_frame();
584 __ restore_LR_CR(tmp);
585 __ restore_volatile_gprs(R1_SP, -nbytes_save); // except R0
586
587 BLOCK_COMMENT("} trace_method_handle");
588 }
589 #endif // PRODUCT