1 /*
2 * Copyright (c) 1997, 2026, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2012, 2026 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 "asm/macroAssembler.inline.hpp"
27 #include "classfile/javaClasses.inline.hpp"
28 #include "classfile/vmClasses.hpp"
29 #include "interpreter/interpreter.hpp"
30 #include "jvm.h"
31 #include "logging/log.hpp"
32 #include "logging/logStream.hpp"
33 #include "memory/allocation.inline.hpp"
34 #include "memory/resourceArea.hpp"
35 #include "prims/jvmtiExport.hpp"
36 #include "prims/methodHandles.hpp"
37 #include "runtime/frame.inline.hpp"
38 #include "runtime/stubRoutines.hpp"
39 #include "utilities/macros.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 void MethodHandles::load_klass_from_Class(MacroAssembler* _masm, Register klass_reg,
53 Register temp_reg, Register temp2_reg) {
54 if (VerifyMethodHandles) {
55 verify_klass(_masm, klass_reg, VM_CLASS_ID(java_lang_Class),
56 temp_reg, temp2_reg, "MH argument is a Class");
57 }
58 __ ld(klass_reg, java_lang_Class::klass_offset(), klass_reg);
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 //ASSERT
68 #define NONZERO(x) (x)
69 #endif //ASSERT
70
71 #ifdef ASSERT
72 void MethodHandles::verify_klass(MacroAssembler* _masm,
73 Register obj_reg, vmClassID klass_id,
74 Register temp_reg, Register temp2_reg,
75 const char* error_message) {
76 InstanceKlass** klass_addr = vmClasses::klass_addr_at(klass_id);
77 Klass* klass = vmClasses::klass_at(klass_id);
78 Label L_ok, L_bad;
79 BLOCK_COMMENT("verify_klass {");
80 __ verify_oop(obj_reg, FILE_AND_LINE);
81 __ cmpdi(CR0, obj_reg, 0);
82 __ beq(CR0, L_bad);
83 __ load_klass(temp_reg, obj_reg);
84 __ load_const_optimized(temp2_reg, (address) klass_addr);
85 __ ld(temp2_reg, 0, temp2_reg);
86 __ cmpd(CR0, temp_reg, temp2_reg);
87 __ beq(CR0, L_ok);
88 __ ld(temp_reg, klass->super_check_offset(), temp_reg);
89 __ cmpd(CR0, temp_reg, temp2_reg);
90 __ beq(CR0, L_ok);
91 __ BIND(L_bad);
92 __ stop(error_message);
93 __ BIND(L_ok);
94 BLOCK_COMMENT("} verify_klass");
95 }
96
97 void MethodHandles::verify_ref_kind(MacroAssembler* _masm, int ref_kind, Register member_reg, Register temp) {
98 Label L;
99 BLOCK_COMMENT("verify_ref_kind {");
100 __ load_sized_value(temp, NONZERO(java_lang_invoke_MemberName::flags_offset()), member_reg,
101 sizeof(u4), /*is_signed*/ false);
102 // assert(sizeof(u4) == sizeof(java.lang.invoke.MemberName.flags), "");
103 __ srwi( temp, temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT);
104 __ andi(temp, temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK);
105 __ cmpwi(CR1, temp, ref_kind);
106 __ beq(CR1, L);
107 const char* msg = ref_kind_to_verify_msg(ref_kind);
108 if (ref_kind == JVM_REF_invokeVirtual ||
109 ref_kind == JVM_REF_invokeSpecial) {
110 // could do this for all ref_kinds, but would explode assembly code size
111 trace_method_handle(_masm, msg);
112 }
113 __ stop(msg);
114 BLOCK_COMMENT("} verify_ref_kind");
115 __ BIND(L);
116 }
117
118 #endif // ASSERT
119
120 void MethodHandles::jump_from_method_handle(MacroAssembler* _masm, Register method, Register target, Register temp,
121 bool for_compiler_entry) {
122 Label L_no_such_method;
123 assert(method == R19_method, "interpreter calling convention");
124 assert_different_registers(method, target, temp);
125
126 if (!for_compiler_entry && JvmtiExport::can_post_interpreter_events()) {
127 Label run_compiled_code;
128 // JVMTI events, such as single-stepping, are implemented partly by avoiding running
129 // compiled code in threads for which the event is enabled. Check here for
130 // interp_only_mode if these events CAN be enabled.
131 __ lwz(temp, in_bytes(JavaThread::interp_only_mode_offset()), R16_thread);
132 __ cmplwi(CR0, temp, 0);
133 __ beq(CR0, run_compiled_code);
134 // Null method test is replicated below in compiled case.
135 __ cmplwi(CR0, R19_method, 0);
136 __ beq(CR0, L_no_such_method);
137 __ ld(target, in_bytes(Method::interpreter_entry_offset()), R19_method);
138 __ mtctr(target);
139 __ bctr();
140 __ BIND(run_compiled_code);
141 }
142
143 // Compiled case, either static or fall-through from runtime conditional
144 __ cmplwi(CR0, R19_method, 0);
145 __ beq(CR0, L_no_such_method);
146
147 const ByteSize entry_offset = for_compiler_entry ? Method::from_compiled_offset() :
148 Method::from_interpreted_offset();
149 __ ld(target, in_bytes(entry_offset), R19_method);
150 __ mtctr(target);
151 __ bctr();
152
153 __ bind(L_no_such_method);
154 assert(SharedRuntime::throw_AbstractMethodError_entry() != nullptr, "not yet generated!");
155 __ load_const_optimized(target, SharedRuntime::throw_AbstractMethodError_entry());
156 __ mtctr(target);
157 __ bctr();
158 }
159
160
161 void MethodHandles::jump_to_lambda_form(MacroAssembler* _masm,
162 Register recv, Register method_temp,
163 Register temp2, Register temp3,
164 bool for_compiler_entry) {
165 BLOCK_COMMENT("jump_to_lambda_form {");
166 // This is the initial entry point of a lazy method handle.
167 // After type checking, it picks up the invoker from the LambdaForm.
168 assert_different_registers(recv, method_temp, temp2, temp3);
169 assert(method_temp == R19_method, "required register for loading method");
170
171 // Load the invoker, as MH -> MH.form -> LF.vmentry
172 __ verify_oop(recv, FILE_AND_LINE);
173
174 const MacroAssembler::PreservationLevel preservation_level = for_compiler_entry
175 ? MacroAssembler::PRESERVATION_FRAME_LR_GP_FP_REGS
176 : MacroAssembler::PRESERVATION_FRAME_LR;
177
178 __ load_heap_oop(method_temp, NONZERO(java_lang_invoke_MethodHandle::form_offset()), recv,
179 temp2, temp3, preservation_level, IS_NOT_NULL);
180 __ verify_oop(method_temp, FILE_AND_LINE);
181 __ load_heap_oop(method_temp, NONZERO(java_lang_invoke_LambdaForm::vmentry_offset()), method_temp,
182 temp2, temp3, preservation_level, IS_NOT_NULL);
183 __ verify_oop(method_temp, FILE_AND_LINE);
184 __ load_heap_oop(method_temp, NONZERO(java_lang_invoke_MemberName::method_offset()), method_temp,
185 temp2, temp3, preservation_level, IS_NOT_NULL);
186 __ verify_oop(method_temp, FILE_AND_LINE);
187 __ ld(method_temp, NONZERO(java_lang_invoke_ResolvedMethodName::vmtarget_offset()), method_temp);
188
189 if (VerifyMethodHandles && !for_compiler_entry) {
190 // Make sure recv is already on stack.
191 __ ld(temp2, in_bytes(Method::const_offset()), method_temp);
192 __ load_sized_value(temp2, in_bytes(ConstMethod::size_of_parameters_offset()), temp2,
193 sizeof(u2), /*is_signed*/ false);
194 // assert(sizeof(u2) == sizeof(ConstMethod::_size_of_parameters), "");
195 Label L;
196 __ ld(temp2, __ argument_offset(temp2, temp2, 0), R15_esp);
197 __ cmpd(CR1, temp2, recv);
198 __ beq(CR1, L);
199 __ stop("receiver not on stack");
200 __ BIND(L);
201 }
202
203 jump_from_method_handle(_masm, method_temp, temp2, temp3, for_compiler_entry);
204 BLOCK_COMMENT("} jump_to_lambda_form");
205 }
206
207
208
209 // Code generation
210 address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* _masm,
211 vmIntrinsics::ID iid) {
212 const bool not_for_compiler_entry = false; // this is the interpreter entry
213 assert(is_signature_polymorphic(iid), "expected invoke iid");
214 if (iid == vmIntrinsics::_invokeGeneric ||
215 iid == vmIntrinsics::_compiledLambdaForm) {
216 // Perhaps surprisingly, the symbolic references visible to Java are not directly used.
217 // They are linked to Java-generated adapters via MethodHandleNatives.linkMethod.
218 // They all allow an appendix argument.
219 __ stop("Should not reach here"); // empty stubs make SG sick
220 return nullptr;
221 }
222
223 // No need in interpreter entry for linkToNative for now.
224 // Interpreter calls compiled entry through i2c.
225 if (iid == vmIntrinsics::_linkToNative) {
226 __ stop("Should not reach here"); // empty stubs make SG sick
227 return nullptr;
228 }
229
230 Register R15_argbase = R15_esp; // parameter (preserved)
231 Register R30_tmp1 = R30;
232 Register R7_param_size = R7;
233
234 // here's where control starts out:
235 __ align(CodeEntryAlignment);
236 address entry_point = __ pc();
237
238 if (VerifyMethodHandles) {
239 assert(Method::intrinsic_id_size_in_bytes() == 2, "assuming Method::_intrinsic_id is u2");
240
241 Label L;
242 BLOCK_COMMENT("verify_intrinsic_id {");
243 __ load_sized_value(R30_tmp1, in_bytes(Method::intrinsic_id_offset()), R19_method,
244 sizeof(u2), /*is_signed*/ false);
245 __ cmpwi(CR1, R30_tmp1, (int) iid);
246 __ beq(CR1, L);
247 if (iid == vmIntrinsics::_linkToVirtual ||
248 iid == vmIntrinsics::_linkToSpecial) {
249 // could do this for all kinds, but would explode assembly code size
250 trace_method_handle(_masm, "bad Method*:intrinsic_id");
251 }
252 __ stop("bad Method*::intrinsic_id");
253 __ BIND(L);
254 BLOCK_COMMENT("} verify_intrinsic_id");
255 }
256
257 // First task: Find out how big the argument list is.
258 int ref_kind = signature_polymorphic_intrinsic_ref_kind(iid);
259 assert(ref_kind != 0 || iid == vmIntrinsics::_invokeBasic, "must be _invokeBasic or a linkTo intrinsic");
260 if (ref_kind == 0 || MethodHandles::ref_kind_has_receiver(ref_kind)) {
261 __ ld(R7_param_size, in_bytes(Method::const_offset()), R19_method);
262 __ load_sized_value(R7_param_size, in_bytes(ConstMethod::size_of_parameters_offset()), R7_param_size,
263 sizeof(u2), /*is_signed*/ false);
264 // assert(sizeof(u2) == sizeof(ConstMethod::_size_of_parameters), "");
265 } else {
266 DEBUG_ONLY(R7_param_size = noreg);
267 }
268
269 Register tmp_mh = noreg;
270 if (!is_signature_polymorphic_static(iid)) {
271 __ ld(tmp_mh = R30_tmp1, __ argument_offset(R7_param_size, R7_param_size, 0), R15_argbase);
272 DEBUG_ONLY(R7_param_size = noreg);
273 }
274
275 if (log_is_enabled(Info, methodhandles)) {
276 if (tmp_mh != noreg) {
277 __ mr(R23_method_handle, tmp_mh); // make stub happy
278 }
279 trace_method_handle_interpreter_entry(_masm, iid);
280 }
281
282 if (iid == vmIntrinsics::_invokeBasic) {
283 generate_method_handle_dispatch(_masm, iid, tmp_mh, noreg, not_for_compiler_entry);
284
285 } else {
286 // Adjust argument list by popping the trailing MemberName argument.
287 Register tmp_recv = noreg;
288 if (MethodHandles::ref_kind_has_receiver(ref_kind)) {
289 // Load the receiver (not the MH; the actual MemberName's receiver) up from the interpreter stack.
290 __ ld(tmp_recv = R30_tmp1, __ argument_offset(R7_param_size, R7_param_size, 0), R15_argbase);
291 DEBUG_ONLY(R7_param_size = noreg);
292 }
293 Register R19_member = R19_method; // MemberName ptr; incoming method ptr is dead now
294 __ ld(R19_member, RegisterOrConstant((intptr_t)8), R15_argbase);
295 __ addi(R15_argbase, R15_argbase, Interpreter::stackElementSize);
296 generate_method_handle_dispatch(_masm, iid, tmp_recv, R19_member, not_for_compiler_entry);
297 }
298
299 return entry_point;
300 }
301
302 void MethodHandles::jump_to_native_invoker(MacroAssembler* _masm, Register nep_reg, Register temp_target) {
303 BLOCK_COMMENT("jump_to_native_invoker {");
304 assert_different_registers(nep_reg, temp_target);
305 assert(nep_reg != noreg, "required register");
306
307 // Load the invoker, as NEP -> .invoker
308 __ verify_oop(nep_reg);
309 __ ld(temp_target, NONZERO(jdk_internal_foreign_abi_NativeEntryPoint::downcall_stub_address_offset_in_bytes()), nep_reg);
310 __ mtctr(temp_target);
311 __ bctr();
312 BLOCK_COMMENT("} jump_to_native_invoker");
313 }
314
315 void MethodHandles::generate_method_handle_dispatch(MacroAssembler* _masm,
316 vmIntrinsics::ID iid,
317 Register receiver_reg,
318 Register member_reg,
319 bool for_compiler_entry) {
320 assert(is_signature_polymorphic(iid), "expected invoke iid");
321 Register temp1 = (for_compiler_entry ? R25_tmp5 : R31); // must be non-volatile due to runtime calls
322 Register temp2 = (for_compiler_entry ? R22_tmp2 : R8);
323 Register temp3 = (for_compiler_entry ? R23_tmp3 : R9);
324 Register temp4 = (for_compiler_entry ? R24_tmp4 : R10);
325 if (receiver_reg != noreg) assert_different_registers(temp1, temp2, temp3, temp4, receiver_reg);
326 if (member_reg != noreg) assert_different_registers(temp1, temp2, temp3, temp4, member_reg);
327
328 const MacroAssembler::PreservationLevel preservation_level = for_compiler_entry
329 ? MacroAssembler::PRESERVATION_FRAME_LR_GP_FP_REGS
330 : MacroAssembler::PRESERVATION_FRAME_LR;
331
332 if (iid == vmIntrinsics::_invokeBasic) {
333 // indirect through MH.form.vmentry.vmtarget
334 jump_to_lambda_form(_masm, receiver_reg, R19_method, temp1, temp2, for_compiler_entry);
335 } else if (iid == vmIntrinsics::_linkToNative) {
336 assert(for_compiler_entry, "only compiler entry is supported");
337 jump_to_native_invoker(_masm, member_reg, temp1);
338 } else {
339 // The method is a member invoker used by direct method handles.
340 if (VerifyMethodHandles) {
341 // make sure the trailing argument really is a MemberName (caller responsibility)
342 verify_klass(_masm, member_reg, VM_CLASS_ID(MemberName_klass),
343 temp1, temp2,
344 "MemberName required for invokeVirtual etc.");
345 }
346
347 Register temp1_recv_klass = temp1;
348 if (iid != vmIntrinsics::_linkToStatic) {
349 BLOCK_COMMENT("check_receiver {");
350 __ verify_oop(receiver_reg, FILE_AND_LINE);
351
352 const int klass_offset = iid == vmIntrinsics::_linkToSpecial
353 ? -1 // enforce receiver null check
354 : oopDesc::klass_offset_in_bytes(); // regular null-checking behavior
355
356 address NullPointerException_entry = for_compiler_entry ? SharedRuntime::throw_NullPointerException_at_call_entry()
357 : Interpreter::throw_NullPointerException_entry();
358 __ null_check_throw(receiver_reg, klass_offset, temp1, NullPointerException_entry);
359
360 if (iid != vmIntrinsics::_linkToSpecial || VerifyMethodHandles) {
361 __ load_klass(temp1_recv_klass, receiver_reg);
362 __ verify_klass_ptr(temp1_recv_klass);
363 }
364
365 if (VerifyMethodHandles && iid != vmIntrinsics::_linkToInterface) {
366 Label L_ok;
367 Register temp2_defc = temp2;
368
369 __ load_heap_oop(temp2_defc, NONZERO(java_lang_invoke_MemberName::clazz_offset()), member_reg,
370 temp3, temp4, preservation_level, IS_NOT_NULL);
371 load_klass_from_Class(_masm, temp2_defc, temp3, temp4);
372 __ verify_klass_ptr(temp2_defc);
373 __ check_klass_subtype(temp1_recv_klass, temp2_defc, temp3, temp4, L_ok);
374 // If we get here, the type check failed!
375 __ stop("receiver class disagrees with MemberName.clazz");
376 __ BIND(L_ok);
377 }
378 BLOCK_COMMENT("} check_receiver");
379 }
380 if (iid == vmIntrinsics::_linkToSpecial ||
381 iid == vmIntrinsics::_linkToStatic) {
382 DEBUG_ONLY(temp1_recv_klass = noreg); // these guys didn't load the recv_klass
383 }
384
385 // Live registers at this point:
386 // member_reg - MemberName that was the trailing argument
387 // temp1_recv_klass - klass of stacked receiver, if needed
388
389 Label L_incompatible_class_change_error;
390 switch (iid) {
391 case vmIntrinsics::_linkToSpecial:
392 if (VerifyMethodHandles) {
393 verify_ref_kind(_masm, JVM_REF_invokeSpecial, member_reg, temp2);
394 }
395 __ load_heap_oop(R19_method, NONZERO(java_lang_invoke_MemberName::method_offset()), member_reg,
396 temp3, temp4, preservation_level, IS_NOT_NULL);
397 __ ld(R19_method, NONZERO(java_lang_invoke_ResolvedMethodName::vmtarget_offset()), R19_method);
398 break;
399
400 case vmIntrinsics::_linkToStatic:
401 if (VerifyMethodHandles) {
402 verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp2);
403 }
404 __ load_heap_oop(R19_method, NONZERO(java_lang_invoke_MemberName::method_offset()), member_reg,
405 temp3, temp4, preservation_level, IS_NOT_NULL);
406 __ ld(R19_method, NONZERO(java_lang_invoke_ResolvedMethodName::vmtarget_offset()), R19_method);
407 break;
408
409 case vmIntrinsics::_linkToVirtual:
410 {
411 // same as TemplateTable::invokevirtual,
412 // minus the CP setup and profiling:
413
414 if (VerifyMethodHandles) {
415 verify_ref_kind(_masm, JVM_REF_invokeVirtual, member_reg, temp2);
416 }
417
418 // pick out the vtable index from the MemberName, and then we can discard it:
419 Register temp2_index = temp2;
420 __ ld(temp2_index, NONZERO(java_lang_invoke_MemberName::vmindex_offset()), member_reg);
421
422 if (VerifyMethodHandles) {
423 Label L_index_ok;
424 __ cmpdi(CR1, temp2_index, 0);
425 __ bge(CR1, L_index_ok);
426 __ stop("no virtual index");
427 __ BIND(L_index_ok);
428 }
429
430 // Note: The verifier invariants allow us to ignore MemberName.clazz and vmtarget
431 // at this point. And VerifyMethodHandles has already checked clazz, if needed.
432
433 // get target Method* & entry point
434 __ lookup_virtual_method(temp1_recv_klass, temp2_index, R19_method);
435 break;
436 }
437
438 case vmIntrinsics::_linkToInterface:
439 {
440 // same as TemplateTable::invokeinterface
441 // (minus the CP setup and profiling, with different argument motion)
442 if (VerifyMethodHandles) {
443 verify_ref_kind(_masm, JVM_REF_invokeInterface, member_reg, temp2);
444 }
445
446 Register temp2_intf = temp2;
447 __ load_heap_oop(temp2_intf, NONZERO(java_lang_invoke_MemberName::clazz_offset()), member_reg,
448 temp3, temp4, preservation_level, IS_NOT_NULL);
449 load_klass_from_Class(_masm, temp2_intf, temp3, temp4);
450 __ verify_klass_ptr(temp2_intf);
451
452 Register vtable_index = R19_method;
453 __ ld(vtable_index, NONZERO(java_lang_invoke_MemberName::vmindex_offset()), member_reg);
454 if (VerifyMethodHandles) {
455 Label L_index_ok;
456 __ cmpdi(CR1, vtable_index, 0);
457 __ bge(CR1, L_index_ok);
458 __ stop("invalid vtable index for MH.invokeInterface");
459 __ BIND(L_index_ok);
460 }
461
462 // given intf, index, and recv klass, dispatch to the implementation method
463 __ lookup_interface_method(temp1_recv_klass, temp2_intf,
464 // note: next two args must be the same:
465 vtable_index, R19_method,
466 temp3, temp4,
467 L_incompatible_class_change_error);
468 break;
469 }
470
471 default:
472 fatal("unexpected intrinsic %d: %s", vmIntrinsics::as_int(iid), vmIntrinsics::name_at(iid));
473 break;
474 }
475
476 // Live at this point:
477 // R19_method
478
479 // After figuring out which concrete method to call, jump into it.
480 // Note that this works in the interpreter with no data motion.
481 // But the compiled version will require that rcx_recv be shifted out.
482 __ verify_method_ptr(R19_method);
483 jump_from_method_handle(_masm, R19_method, temp1, temp2, for_compiler_entry);
484
485 if (iid == vmIntrinsics::_linkToInterface) {
486 __ BIND(L_incompatible_class_change_error);
487 __ load_const_optimized(temp1, SharedRuntime::throw_IncompatibleClassChangeError_entry());
488 __ mtctr(temp1);
489 __ bctr();
490 }
491 }
492 }
493
494 #ifndef PRODUCT
495 void trace_method_handle_stub(const char* adaptername,
496 oopDesc* mh,
497 intptr_t* entry_sp,
498 intptr_t* saved_regs) {
499
500 bool has_mh = (strstr(adaptername, "/static") == nullptr &&
501 strstr(adaptername, "linkTo") == nullptr); // static linkers don't have MH
502 const char* mh_reg_name = has_mh ? "R23_method_handle" : "G23";
503 log_info(methodhandles)("MH %s %s=" INTPTR_FORMAT " sp=" INTPTR_FORMAT,
504 adaptername, mh_reg_name, p2i(mh), p2i(entry_sp));
505
506 LogTarget(Trace, methodhandles) lt;
507 if (lt.is_enabled()) {
508 ResourceMark rm;
509 LogStream ls(lt);
510 ls.print_cr("Registers:");
511 const int abi_offset = frame::native_abi_reg_args_size / 8;
512 for (int i = R3->encoding(); i <= R12->encoding(); i++) {
513 Register r = as_Register(i);
514 int count = i - R3->encoding();
515 // The registers are stored in reverse order on the stack (by save_volatile_gprs(R1_SP, native_abi_reg_args_size)).
516 ls.print("%3s=" PTR_FORMAT, r->name(), saved_regs[abi_offset + count]);
517 if ((count + 1) % 4 == 0) {
518 ls.cr();
519 } else {
520 ls.print(", ");
521 }
522 }
523 ls.cr();
524
525 {
526 // dumping last frame with frame::describe
527
528 JavaThread* p = JavaThread::active();
529
530 // may not be needed by safer and unexpensive here
531 PreserveExceptionMark pem(Thread::current());
532 FrameValues values;
533
534 // Note: We want to allow trace_method_handle from any call site.
535 // While trace_method_handle creates a frame, it may be entered
536 // without a PC on the stack top (e.g. not just after a call).
537 // Walking that frame could lead to failures due to that invalid PC.
538 // => carefully detect that frame when doing the stack walking
539
540 // Current C frame
541 frame cur_frame = os::current_frame();
542
543 // Robust search of trace_calling_frame (independent of inlining).
544 assert(cur_frame.sp() <= saved_regs, "registers not saved on stack ?");
545 frame trace_calling_frame = os::get_sender_for_C_frame(&cur_frame);
546 while (trace_calling_frame.fp() < saved_regs) {
547 trace_calling_frame = os::get_sender_for_C_frame(&trace_calling_frame);
548 }
549
550 // Safely create a frame and call frame::describe.
551 intptr_t *dump_sp = trace_calling_frame.sender_sp();
552
553 frame dump_frame = frame(dump_sp);
554 dump_frame.describe(values, 1);
555
556 values.describe(-1, saved_regs, "raw top of stack");
557
558 ls.print_cr("Stack layout:");
559 values.print_on(p, &ls);
560 }
561
562 if (has_mh && oopDesc::is_oop(mh)) {
563 mh->print_on(&ls);
564 if (java_lang_invoke_MethodHandle::is_instance(mh)) {
565 java_lang_invoke_MethodHandle::form(mh)->print_on(&ls);
566 }
567 }
568 }
569 }
570
571 void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) {
572 if (!log_is_enabled(Info, methodhandles)) return;
573
574 BLOCK_COMMENT("trace_method_handle {");
575
576 const Register tmp = R11; // Will be preserved.
577 const int nbytes_save = MacroAssembler::num_volatile_regs * 8;
578 __ save_volatile_gprs(R1_SP, -nbytes_save); // except R0
579 __ save_LR(tmp); // save in old frame
580
581 __ mr(R5_ARG3, R1_SP); // saved_sp
582 __ push_frame_reg_args(nbytes_save, tmp);
583
584 __ load_const_optimized(R3_ARG1, (address)adaptername, tmp);
585 __ mr(R4_ARG2, R23_method_handle);
586 __ mr(R6_ARG4, R1_SP);
587 __ call_VM_leaf(CAST_FROM_FN_PTR(address, trace_method_handle_stub));
588
589 __ pop_frame();
590 __ restore_LR(tmp);
591 __ restore_volatile_gprs(R1_SP, -nbytes_save); // except R0
592
593 BLOCK_COMMENT("} trace_method_handle");
594 }
595 #endif // PRODUCT