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