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 // The following jump might pass an inline type argument that was erased to Object as oop to a
148 // callee that expects inline type arguments to be passed as fields. We need to call the compiled
149 // value entry (_code->inline_entry_point() or _adapter->c2i_inline_entry()) which will take care
150 // of translating between the calling conventions.
151 const ByteSize entry_offset = for_compiler_entry ? Method::from_compiled_inline_offset() :
152 Method::from_interpreted_offset();
153 __ ld(target, in_bytes(entry_offset), R19_method);
154 __ mtctr(target);
155 __ bctr();
156
157 __ bind(L_no_such_method);
158 assert(SharedRuntime::throw_AbstractMethodError_entry() != nullptr, "not yet generated!");
159 __ load_const_optimized(target, SharedRuntime::throw_AbstractMethodError_entry());
160 __ mtctr(target);
161 __ bctr();
162 }
163
164
165 void MethodHandles::jump_to_lambda_form(MacroAssembler* _masm,
166 Register recv, Register method_temp,
167 Register temp2, Register temp3,
168 bool for_compiler_entry) {
169 BLOCK_COMMENT("jump_to_lambda_form {");
170 // This is the initial entry point of a lazy method handle.
171 // After type checking, it picks up the invoker from the LambdaForm.
172 assert_different_registers(recv, method_temp, temp2, temp3);
173 assert(method_temp == R19_method, "required register for loading method");
174
175 // Load the invoker, as MH -> MH.form -> LF.vmentry
176 __ verify_oop(recv, FILE_AND_LINE);
177
178 const MacroAssembler::PreservationLevel preservation_level = for_compiler_entry
179 ? MacroAssembler::PRESERVATION_FRAME_LR_GP_FP_REGS
180 : MacroAssembler::PRESERVATION_FRAME_LR;
181
182 __ load_heap_oop(method_temp, NONZERO(java_lang_invoke_MethodHandle::form_offset()), recv,
183 temp2, temp3, preservation_level, IS_NOT_NULL);
184 __ verify_oop(method_temp, FILE_AND_LINE);
185 __ load_heap_oop(method_temp, NONZERO(java_lang_invoke_LambdaForm::vmentry_offset()), method_temp,
186 temp2, temp3, preservation_level, IS_NOT_NULL);
187 __ verify_oop(method_temp, FILE_AND_LINE);
188 __ load_heap_oop(method_temp, NONZERO(java_lang_invoke_MemberName::method_offset()), method_temp,
189 temp2, temp3, preservation_level, IS_NOT_NULL);
190 __ verify_oop(method_temp, FILE_AND_LINE);
191 __ ld(method_temp, NONZERO(java_lang_invoke_ResolvedMethodName::vmtarget_offset()), method_temp);
192
193 if (VerifyMethodHandles && !for_compiler_entry) {
194 // Make sure recv is already on stack.
195 __ ld(temp2, in_bytes(Method::const_offset()), method_temp);
196 __ load_sized_value(temp2, in_bytes(ConstMethod::size_of_parameters_offset()), temp2,
197 sizeof(u2), /*is_signed*/ false);
198 // assert(sizeof(u2) == sizeof(ConstMethod::_size_of_parameters), "");
199 Label L;
200 __ ld(temp2, __ argument_offset(temp2, temp2, 0), R15_esp);
201 __ cmpd(CR1, temp2, recv);
202 __ beq(CR1, L);
203 __ stop("receiver not on stack");
204 __ BIND(L);
205 }
206
207 jump_from_method_handle(_masm, method_temp, temp2, temp3, for_compiler_entry);
208 BLOCK_COMMENT("} jump_to_lambda_form");
209 }
210
211
212
213 // Code generation
214 address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* _masm,
215 vmIntrinsics::ID iid) {
216 const bool not_for_compiler_entry = false; // this is the interpreter entry
217 assert(is_signature_polymorphic(iid), "expected invoke iid");
218 if (iid == vmIntrinsics::_invokeGeneric ||
219 iid == vmIntrinsics::_compiledLambdaForm) {
220 // Perhaps surprisingly, the symbolic references visible to Java are not directly used.
221 // They are linked to Java-generated adapters via MethodHandleNatives.linkMethod.
222 // They all allow an appendix argument.
223 __ stop("Should not reach here"); // empty stubs make SG sick
224 return nullptr;
225 }
226
227 // No need in interpreter entry for linkToNative for now.
228 // Interpreter calls compiled entry through i2c.
229 if (iid == vmIntrinsics::_linkToNative) {
230 __ stop("Should not reach here"); // empty stubs make SG sick
231 return nullptr;
232 }
233
234 Register R15_argbase = R15_esp; // parameter (preserved)
235 Register R30_tmp1 = R30;
236 Register R7_param_size = R7;
237
238 // here's where control starts out:
239 __ align(CodeEntryAlignment);
240 address entry_point = __ pc();
241
242 if (VerifyMethodHandles) {
243 assert(Method::intrinsic_id_size_in_bytes() == 2, "assuming Method::_intrinsic_id is u2");
244
245 Label L;
246 BLOCK_COMMENT("verify_intrinsic_id {");
247 __ load_sized_value(R30_tmp1, in_bytes(Method::intrinsic_id_offset()), R19_method,
248 sizeof(u2), /*is_signed*/ false);
249 __ cmpwi(CR1, R30_tmp1, (int) iid);
250 __ beq(CR1, L);
251 if (iid == vmIntrinsics::_linkToVirtual ||
252 iid == vmIntrinsics::_linkToSpecial) {
253 // could do this for all kinds, but would explode assembly code size
254 trace_method_handle(_masm, "bad Method*:intrinsic_id");
255 }
256 __ stop("bad Method*::intrinsic_id");
257 __ BIND(L);
258 BLOCK_COMMENT("} verify_intrinsic_id");
259 }
260
261 // First task: Find out how big the argument list is.
262 int ref_kind = signature_polymorphic_intrinsic_ref_kind(iid);
263 assert(ref_kind != 0 || iid == vmIntrinsics::_invokeBasic, "must be _invokeBasic or a linkTo intrinsic");
264 if (ref_kind == 0 || MethodHandles::ref_kind_has_receiver(ref_kind)) {
265 __ ld(R7_param_size, in_bytes(Method::const_offset()), R19_method);
266 __ load_sized_value(R7_param_size, in_bytes(ConstMethod::size_of_parameters_offset()), R7_param_size,
267 sizeof(u2), /*is_signed*/ false);
268 // assert(sizeof(u2) == sizeof(ConstMethod::_size_of_parameters), "");
269 } else {
270 DEBUG_ONLY(R7_param_size = noreg);
271 }
272
273 Register tmp_mh = noreg;
274 if (!is_signature_polymorphic_static(iid)) {
275 __ ld(tmp_mh = R30_tmp1, __ argument_offset(R7_param_size, R7_param_size, 0), R15_argbase);
276 DEBUG_ONLY(R7_param_size = noreg);
277 }
278
279 if (log_is_enabled(Info, methodhandles)) {
280 if (tmp_mh != noreg) {
281 __ mr(R23_method_handle, tmp_mh); // make stub happy
282 }
283 trace_method_handle_interpreter_entry(_masm, iid);
284 }
285
286 if (iid == vmIntrinsics::_invokeBasic) {
287 generate_method_handle_dispatch(_masm, iid, tmp_mh, noreg, not_for_compiler_entry);
288
289 } else {
290 // Adjust argument list by popping the trailing MemberName argument.
291 Register tmp_recv = noreg;
292 if (MethodHandles::ref_kind_has_receiver(ref_kind)) {
293 // Load the receiver (not the MH; the actual MemberName's receiver) up from the interpreter stack.
294 __ ld(tmp_recv = R30_tmp1, __ argument_offset(R7_param_size, R7_param_size, 0), R15_argbase);
295 DEBUG_ONLY(R7_param_size = noreg);
296 }
297 Register R19_member = R19_method; // MemberName ptr; incoming method ptr is dead now
298 __ ld(R19_member, RegisterOrConstant((intptr_t)8), R15_argbase);
299 __ addi(R15_argbase, R15_argbase, Interpreter::stackElementSize);
300 generate_method_handle_dispatch(_masm, iid, tmp_recv, R19_member, not_for_compiler_entry);
301 }
302
303 return entry_point;
304 }
305
306 void MethodHandles::jump_to_native_invoker(MacroAssembler* _masm, Register nep_reg, Register temp_target) {
307 BLOCK_COMMENT("jump_to_native_invoker {");
308 assert_different_registers(nep_reg, temp_target);
309 assert(nep_reg != noreg, "required register");
310
311 // Load the invoker, as NEP -> .invoker
312 __ verify_oop(nep_reg);
313 __ ld(temp_target, NONZERO(jdk_internal_foreign_abi_NativeEntryPoint::downcall_stub_address_offset_in_bytes()), nep_reg);
314 __ mtctr(temp_target);
315 __ bctr();
316 BLOCK_COMMENT("} jump_to_native_invoker");
317 }
318
319 void MethodHandles::generate_method_handle_dispatch(MacroAssembler* _masm,
320 vmIntrinsics::ID iid,
321 Register receiver_reg,
322 Register member_reg,
323 bool for_compiler_entry) {
324 assert(is_signature_polymorphic(iid), "expected invoke iid");
325 Register temp1 = (for_compiler_entry ? R25_tmp5 : R31); // must be non-volatile due to runtime calls
326 Register temp2 = (for_compiler_entry ? R22_tmp2 : R8);
327 Register temp3 = (for_compiler_entry ? R23_tmp3 : R9);
328 Register temp4 = (for_compiler_entry ? R24_tmp4 : R10);
329 if (receiver_reg != noreg) assert_different_registers(temp1, temp2, temp3, temp4, receiver_reg);
330 if (member_reg != noreg) assert_different_registers(temp1, temp2, temp3, temp4, member_reg);
331
332 const MacroAssembler::PreservationLevel preservation_level = for_compiler_entry
333 ? MacroAssembler::PRESERVATION_FRAME_LR_GP_FP_REGS
334 : MacroAssembler::PRESERVATION_FRAME_LR;
335
336 if (iid == vmIntrinsics::_invokeBasic) {
337 // indirect through MH.form.vmentry.vmtarget
338 jump_to_lambda_form(_masm, receiver_reg, R19_method, temp1, temp2, for_compiler_entry);
339 } else if (iid == vmIntrinsics::_linkToNative) {
340 assert(for_compiler_entry, "only compiler entry is supported");
341 jump_to_native_invoker(_masm, member_reg, temp1);
342 } else {
343 // The method is a member invoker used by direct method handles.
344 if (VerifyMethodHandles) {
345 // make sure the trailing argument really is a MemberName (caller responsibility)
346 verify_klass(_masm, member_reg, VM_CLASS_ID(MemberName_klass),
347 temp1, temp2,
348 "MemberName required for invokeVirtual etc.");
349 }
350
351 Register temp1_recv_klass = temp1;
352 if (iid != vmIntrinsics::_linkToStatic) {
353 BLOCK_COMMENT("check_receiver {");
354 __ verify_oop(receiver_reg, FILE_AND_LINE);
355
356 const int klass_offset = iid == vmIntrinsics::_linkToSpecial
357 ? -1 // enforce receiver null check
358 : oopDesc::klass_offset_in_bytes(); // regular null-checking behavior
359
360 address NullPointerException_entry = for_compiler_entry ? SharedRuntime::throw_NullPointerException_at_call_entry()
361 : Interpreter::throw_NullPointerException_entry();
362 __ null_check_throw(receiver_reg, klass_offset, temp1, NullPointerException_entry);
363
364 if (iid != vmIntrinsics::_linkToSpecial || VerifyMethodHandles) {
365 __ load_klass(temp1_recv_klass, receiver_reg);
366 __ verify_klass_ptr(temp1_recv_klass);
367 }
368
369 if (VerifyMethodHandles && iid != vmIntrinsics::_linkToInterface) {
370 Label L_ok;
371 Register temp2_defc = temp2;
372
373 __ load_heap_oop(temp2_defc, NONZERO(java_lang_invoke_MemberName::clazz_offset()), member_reg,
374 temp3, temp4, preservation_level, IS_NOT_NULL);
375 load_klass_from_Class(_masm, temp2_defc, temp3, temp4);
376 __ verify_klass_ptr(temp2_defc);
377 __ check_klass_subtype(temp1_recv_klass, temp2_defc, temp3, temp4, L_ok);
378 // If we get here, the type check failed!
379 __ stop("receiver class disagrees with MemberName.clazz");
380 __ BIND(L_ok);
381 }
382 BLOCK_COMMENT("} check_receiver");
383 }
384 if (iid == vmIntrinsics::_linkToSpecial ||
385 iid == vmIntrinsics::_linkToStatic) {
386 DEBUG_ONLY(temp1_recv_klass = noreg); // these guys didn't load the recv_klass
387 }
388
389 // Live registers at this point:
390 // member_reg - MemberName that was the trailing argument
391 // temp1_recv_klass - klass of stacked receiver, if needed
392
393 Label L_incompatible_class_change_error;
394 switch (iid) {
395 case vmIntrinsics::_linkToSpecial:
396 if (VerifyMethodHandles) {
397 verify_ref_kind(_masm, JVM_REF_invokeSpecial, member_reg, temp2);
398 }
399 __ load_heap_oop(R19_method, NONZERO(java_lang_invoke_MemberName::method_offset()), member_reg,
400 temp3, temp4, preservation_level, IS_NOT_NULL);
401 __ ld(R19_method, NONZERO(java_lang_invoke_ResolvedMethodName::vmtarget_offset()), R19_method);
402 break;
403
404 case vmIntrinsics::_linkToStatic:
405 if (VerifyMethodHandles) {
406 verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp2);
407 }
408 __ load_heap_oop(R19_method, NONZERO(java_lang_invoke_MemberName::method_offset()), member_reg,
409 temp3, temp4, preservation_level, IS_NOT_NULL);
410 __ ld(R19_method, NONZERO(java_lang_invoke_ResolvedMethodName::vmtarget_offset()), R19_method);
411 break;
412
413 case vmIntrinsics::_linkToVirtual:
414 {
415 // same as TemplateTable::invokevirtual,
416 // minus the CP setup and profiling:
417
418 if (VerifyMethodHandles) {
419 verify_ref_kind(_masm, JVM_REF_invokeVirtual, member_reg, temp2);
420 }
421
422 // pick out the vtable index from the MemberName, and then we can discard it:
423 Register temp2_index = temp2;
424 __ ld(temp2_index, NONZERO(java_lang_invoke_MemberName::vmindex_offset()), member_reg);
425
426 if (VerifyMethodHandles) {
427 Label L_index_ok;
428 __ cmpdi(CR1, temp2_index, 0);
429 __ bge(CR1, L_index_ok);
430 __ stop("no virtual index");
431 __ BIND(L_index_ok);
432 }
433
434 // Note: The verifier invariants allow us to ignore MemberName.clazz and vmtarget
435 // at this point. And VerifyMethodHandles has already checked clazz, if needed.
436
437 // get target Method* & entry point
438 __ lookup_virtual_method(temp1_recv_klass, temp2_index, R19_method);
439 break;
440 }
441
442 case vmIntrinsics::_linkToInterface:
443 {
444 // same as TemplateTable::invokeinterface
445 // (minus the CP setup and profiling, with different argument motion)
446 if (VerifyMethodHandles) {
447 verify_ref_kind(_masm, JVM_REF_invokeInterface, member_reg, temp2);
448 }
449
450 Register temp2_intf = temp2;
451 __ load_heap_oop(temp2_intf, NONZERO(java_lang_invoke_MemberName::clazz_offset()), member_reg,
452 temp3, temp4, preservation_level, IS_NOT_NULL);
453 load_klass_from_Class(_masm, temp2_intf, temp3, temp4);
454 __ verify_klass_ptr(temp2_intf);
455
456 Register vtable_index = R19_method;
457 __ ld(vtable_index, NONZERO(java_lang_invoke_MemberName::vmindex_offset()), member_reg);
458 if (VerifyMethodHandles) {
459 Label L_index_ok;
460 __ cmpdi(CR1, vtable_index, 0);
461 __ bge(CR1, L_index_ok);
462 __ stop("invalid vtable index for MH.invokeInterface");
463 __ BIND(L_index_ok);
464 }
465
466 // given intf, index, and recv klass, dispatch to the implementation method
467 __ lookup_interface_method(temp1_recv_klass, temp2_intf,
468 // note: next two args must be the same:
469 vtable_index, R19_method,
470 temp3, temp4,
471 L_incompatible_class_change_error);
472 break;
473 }
474
475 default:
476 fatal("unexpected intrinsic %d: %s", vmIntrinsics::as_int(iid), vmIntrinsics::name_at(iid));
477 break;
478 }
479
480 // Live at this point:
481 // R19_method
482
483 // After figuring out which concrete method to call, jump into it.
484 // Note that this works in the interpreter with no data motion.
485 // But the compiled version will require that rcx_recv be shifted out.
486 __ verify_method_ptr(R19_method);
487 jump_from_method_handle(_masm, R19_method, temp1, temp2, for_compiler_entry);
488
489 if (iid == vmIntrinsics::_linkToInterface) {
490 __ BIND(L_incompatible_class_change_error);
491 __ load_const_optimized(temp1, SharedRuntime::throw_IncompatibleClassChangeError_entry());
492 __ mtctr(temp1);
493 __ bctr();
494 }
495 }
496 }
497
498 #ifndef PRODUCT
499 void trace_method_handle_stub(const char* adaptername,
500 oopDesc* mh,
501 intptr_t* entry_sp,
502 intptr_t* saved_regs) {
503
504 bool has_mh = (strstr(adaptername, "/static") == nullptr &&
505 strstr(adaptername, "linkTo") == nullptr); // static linkers don't have MH
506 const char* mh_reg_name = has_mh ? "R23_method_handle" : "G23";
507 log_info(methodhandles)("MH %s %s=" INTPTR_FORMAT " sp=" INTPTR_FORMAT,
508 adaptername, mh_reg_name, p2i(mh), p2i(entry_sp));
509
510 LogTarget(Trace, methodhandles) lt;
511 if (lt.is_enabled()) {
512 ResourceMark rm;
513 LogStream ls(lt);
514 ls.print_cr("Registers:");
515 const int abi_offset = frame::native_abi_reg_args_size / 8;
516 for (int i = R3->encoding(); i <= R12->encoding(); i++) {
517 Register r = as_Register(i);
518 int count = i - R3->encoding();
519 // The registers are stored in reverse order on the stack (by save_volatile_gprs(R1_SP, native_abi_reg_args_size)).
520 ls.print("%3s=" PTR_FORMAT, r->name(), saved_regs[abi_offset + count]);
521 if ((count + 1) % 4 == 0) {
522 ls.cr();
523 } else {
524 ls.print(", ");
525 }
526 }
527 ls.cr();
528
529 {
530 // dumping last frame with frame::describe
531
532 JavaThread* p = JavaThread::active();
533
534 // may not be needed by safer and unexpensive here
535 PreserveExceptionMark pem(Thread::current());
536 FrameValues values;
537
538 // Note: We want to allow trace_method_handle from any call site.
539 // While trace_method_handle creates a frame, it may be entered
540 // without a PC on the stack top (e.g. not just after a call).
541 // Walking that frame could lead to failures due to that invalid PC.
542 // => carefully detect that frame when doing the stack walking
543
544 // Current C frame
545 frame cur_frame = os::current_frame();
546
547 // Robust search of trace_calling_frame (independent of inlining).
548 assert(cur_frame.sp() <= saved_regs, "registers not saved on stack ?");
549 frame trace_calling_frame = os::get_sender_for_C_frame(&cur_frame);
550 while (trace_calling_frame.fp() < saved_regs) {
551 trace_calling_frame = os::get_sender_for_C_frame(&trace_calling_frame);
552 }
553
554 // Safely create a frame and call frame::describe.
555 intptr_t *dump_sp = trace_calling_frame.sender_sp();
556
557 frame dump_frame = frame(dump_sp);
558 dump_frame.describe(values, 1);
559
560 values.describe(-1, saved_regs, "raw top of stack");
561
562 ls.print_cr("Stack layout:");
563 values.print_on(p, &ls);
564 }
565
566 if (has_mh && oopDesc::is_oop(mh)) {
567 mh->print_on(&ls);
568 if (java_lang_invoke_MethodHandle::is_instance(mh)) {
569 java_lang_invoke_MethodHandle::form(mh)->print_on(&ls);
570 }
571 }
572 }
573 }
574
575 void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) {
576 if (!log_is_enabled(Info, methodhandles)) return;
577
578 BLOCK_COMMENT("trace_method_handle {");
579
580 const Register tmp = R11; // Will be preserved.
581 const int nbytes_save = MacroAssembler::num_volatile_regs * 8;
582 __ save_volatile_gprs(R1_SP, -nbytes_save); // except R0
583 __ save_LR(tmp); // save in old frame
584
585 __ mr(R5_ARG3, R1_SP); // saved_sp
586 __ push_frame_reg_args(nbytes_save, tmp);
587
588 __ load_const_optimized(R3_ARG1, (address)adaptername, tmp);
589 __ mr(R4_ARG2, R23_method_handle);
590 __ mr(R6_ARG4, R1_SP);
591 __ call_VM_leaf(CAST_FROM_FN_PTR(address, trace_method_handle_stub));
592
593 __ pop_frame();
594 __ restore_LR(tmp);
595 __ restore_volatile_gprs(R1_SP, -nbytes_save); // except R0
596
597 BLOCK_COMMENT("} trace_method_handle");
598 }
599 #endif // PRODUCT