1 /*
2 * Copyright (c) 1997, 2015, Oracle and/or its affiliates. All rights reserved.
3 * Copyright (c) 2012, 2015 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 "asm/macroAssembler.inline.hpp"
28 #include "classfile/javaClasses.inline.hpp"
29 #include "interpreter/interpreter.hpp"
30 #include "memory/allocation.inline.hpp"
31 #include "prims/methodHandles.hpp"
32
33 #define __ _masm->
34
35 #ifdef PRODUCT
36 #define BLOCK_COMMENT(str) // nothing
37 #else
38 #define BLOCK_COMMENT(str) __ block_comment(str)
39 #endif
40
41 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":")
42
43 // Workaround for C++ overloading nastiness on '0' for RegisterOrConstant.
44 inline static RegisterOrConstant constant(int value) {
45 return RegisterOrConstant(value);
46 }
47
48 void MethodHandles::load_klass_from_Class(MacroAssembler* _masm, Register klass_reg,
49 Register temp_reg, Register temp2_reg) {
50 if (VerifyMethodHandles) {
51 verify_klass(_masm, klass_reg, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_Class),
52 temp_reg, temp2_reg, "MH argument is a Class");
53 }
54 __ ld(klass_reg, java_lang_Class::klass_offset_in_bytes(), klass_reg);
55 }
56
57 #ifdef ASSERT
58 static int check_nonzero(const char* xname, int x) {
59 assert(x != 0, "%s should be nonzero", xname);
60 return x;
61 }
62 #define NONZERO(x) check_nonzero(#x, x)
63 #else //ASSERT
64 #define NONZERO(x) (x)
65 #endif //ASSERT
66
67 #ifdef ASSERT
68 void MethodHandles::verify_klass(MacroAssembler* _masm,
69 Register obj_reg, SystemDictionary::WKID klass_id,
70 Register temp_reg, Register temp2_reg,
71 const char* error_message) {
72 InstanceKlass** klass_addr = SystemDictionary::well_known_klass_addr(klass_id);
73 KlassHandle klass = SystemDictionary::well_known_klass(klass_id);
74 Label L_ok, L_bad;
75 BLOCK_COMMENT("verify_klass {");
76 __ verify_oop(obj_reg);
77 __ cmpdi(CCR0, obj_reg, 0);
78 __ beq(CCR0, L_bad);
79 __ load_klass(temp_reg, obj_reg);
80 __ load_const_optimized(temp2_reg, (address) klass_addr);
81 __ ld(temp2_reg, 0, temp2_reg);
82 __ cmpd(CCR0, temp_reg, temp2_reg);
83 __ beq(CCR0, L_ok);
84 __ ld(temp_reg, klass->super_check_offset(), temp_reg);
85 __ cmpd(CCR0, temp_reg, temp2_reg);
86 __ beq(CCR0, L_ok);
87 __ BIND(L_bad);
88 __ stop(error_message);
89 __ BIND(L_ok);
90 BLOCK_COMMENT("} verify_klass");
91 }
92
93 void MethodHandles::verify_ref_kind(MacroAssembler* _masm, int ref_kind, Register member_reg, Register temp) {
94 Label L;
95 BLOCK_COMMENT("verify_ref_kind {");
96 __ load_sized_value(temp, NONZERO(java_lang_invoke_MemberName::flags_offset_in_bytes()), member_reg,
97 sizeof(u4), /*is_signed*/ false);
98 // assert(sizeof(u4) == sizeof(java.lang.invoke.MemberName.flags), "");
99 __ srwi( temp, temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT);
100 __ andi(temp, temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK);
101 __ cmpwi(CCR1, temp, ref_kind);
102 __ beq(CCR1, L);
103 { char* buf = NEW_C_HEAP_ARRAY(char, 100, mtInternal);
104 jio_snprintf(buf, 100, "verify_ref_kind expected %x", ref_kind);
105 if (ref_kind == JVM_REF_invokeVirtual ||
106 ref_kind == JVM_REF_invokeSpecial)
107 // could do this for all ref_kinds, but would explode assembly code size
108 trace_method_handle(_masm, buf);
109 __ stop(buf);
110 }
111 BLOCK_COMMENT("} verify_ref_kind");
112 __ BIND(L);
113 }
114
115 #endif // ASSERT
116
117 void MethodHandles::jump_from_method_handle(MacroAssembler* _masm, Register method, Register target, Register temp,
118 bool for_compiler_entry) {
119 Label L_no_such_method;
120 assert(method == R19_method, "interpreter calling convention");
121 assert_different_registers(method, target, temp);
122
123 if (!for_compiler_entry && JvmtiExport::can_post_interpreter_events()) {
124 Label run_compiled_code;
125 // JVMTI events, such as single-stepping, are implemented partly by avoiding running
126 // compiled code in threads for which the event is enabled. Check here for
127 // interp_only_mode if these events CAN be enabled.
128 __ verify_thread();
129 __ lwz(temp, in_bytes(JavaThread::interp_only_mode_offset()), R16_thread);
130 __ cmplwi(CCR0, temp, 0);
131 __ beq(CCR0, run_compiled_code);
132 // Null method test is replicated below in compiled case,
133 // it might be able to address across the verify_thread()
134 __ cmplwi(CCR0, R19_method, 0);
135 __ beq(CCR0, L_no_such_method);
136 __ ld(target, in_bytes(Method::interpreter_entry_offset()), R19_method);
137 __ mtctr(target);
138 __ bctr();
139 __ BIND(run_compiled_code);
140 }
141
142 // Compiled case, either static or fall-through from runtime conditional
143 __ cmplwi(CCR0, R19_method, 0);
144 __ beq(CCR0, L_no_such_method);
145
146 const ByteSize entry_offset = for_compiler_entry ? Method::from_compiled_offset() :
147 Method::from_interpreted_offset();
148 __ ld(target, in_bytes(entry_offset), R19_method);
149 __ mtctr(target);
150 __ bctr();
151
152 __ bind(L_no_such_method);
153 assert(StubRoutines::throw_AbstractMethodError_entry() != NULL, "not yet generated!");
154 __ load_const_optimized(target, StubRoutines::throw_AbstractMethodError_entry());
155 __ mtctr(target);
156 __ bctr();
157 }
158
159
160 void MethodHandles::jump_to_lambda_form(MacroAssembler* _masm,
161 Register recv, Register method_temp,
162 Register temp2, Register temp3,
163 bool for_compiler_entry) {
164 BLOCK_COMMENT("jump_to_lambda_form {");
165 // This is the initial entry point of a lazy method handle.
166 // After type checking, it picks up the invoker from the LambdaForm.
167 assert_different_registers(recv, method_temp, temp2); // temp3 is only passed on
168 assert(method_temp == R19_method, "required register for loading method");
169
170 // Load the invoker, as MH -> MH.form -> LF.vmentry
171 __ verify_oop(recv);
172 __ load_heap_oop_not_null(method_temp, NONZERO(java_lang_invoke_MethodHandle::form_offset_in_bytes()), recv, temp2);
173 __ verify_oop(method_temp);
174 __ load_heap_oop_not_null(method_temp, NONZERO(java_lang_invoke_LambdaForm::vmentry_offset_in_bytes()), method_temp, temp2);
175 __ verify_oop(method_temp);
176 // The following assumes that a Method* is normally compressed in the vmtarget field:
177 __ ld(method_temp, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes()), method_temp);
178
179 if (VerifyMethodHandles && !for_compiler_entry) {
180 // Make sure recv is already on stack.
181 __ ld(temp2, in_bytes(Method::const_offset()), method_temp);
182 __ load_sized_value(temp2, in_bytes(ConstMethod::size_of_parameters_offset()), temp2,
183 sizeof(u2), /*is_signed*/ false);
184 // assert(sizeof(u2) == sizeof(ConstMethod::_size_of_parameters), "");
185 Label L;
186 __ ld(temp2, __ argument_offset(temp2, temp2, 0), R15_esp);
187 __ cmpd(CCR1, temp2, recv);
188 __ beq(CCR1, L);
189 __ stop("receiver not on stack");
190 __ BIND(L);
191 }
192
193 jump_from_method_handle(_masm, method_temp, temp2, temp3, for_compiler_entry);
194 BLOCK_COMMENT("} jump_to_lambda_form");
195 }
196
197
198
199 // Code generation
200 address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* _masm,
201 vmIntrinsics::ID iid) {
202 const bool not_for_compiler_entry = false; // this is the interpreter entry
203 assert(is_signature_polymorphic(iid), "expected invoke iid");
204 if (iid == vmIntrinsics::_invokeGeneric ||
205 iid == vmIntrinsics::_compiledLambdaForm) {
206 // Perhaps surprisingly, the symbolic references visible to Java are not directly used.
207 // They are linked to Java-generated adapters via MethodHandleNatives.linkMethod.
208 // They all allow an appendix argument.
209 __ stop("Should not reach here"); // empty stubs make SG sick
210 return NULL;
211 }
212
213 Register argbase = R15_esp; // parameter (preserved)
214 Register argslot = R3;
215 Register temp1 = R6;
216 Register param_size = R7;
217
218 // here's where control starts out:
219 __ align(CodeEntryAlignment);
220 address entry_point = __ pc();
221
222 if (VerifyMethodHandles) {
223 assert(Method::intrinsic_id_size_in_bytes() == 2, "assuming Method::_intrinsic_id is u2");
224
225 Label L;
226 BLOCK_COMMENT("verify_intrinsic_id {");
227 __ load_sized_value(temp1, Method::intrinsic_id_offset_in_bytes(), R19_method,
228 sizeof(u2), /*is_signed*/ false);
229 __ cmpwi(CCR1, temp1, (int) iid);
230 __ beq(CCR1, L);
231 if (iid == vmIntrinsics::_linkToVirtual ||
232 iid == vmIntrinsics::_linkToSpecial) {
233 // could do this for all kinds, but would explode assembly code size
234 trace_method_handle(_masm, "bad Method*:intrinsic_id");
235 }
236 __ stop("bad Method*::intrinsic_id");
237 __ BIND(L);
238 BLOCK_COMMENT("} verify_intrinsic_id");
239 }
240
241 // First task: Find out how big the argument list is.
242 int ref_kind = signature_polymorphic_intrinsic_ref_kind(iid);
243 assert(ref_kind != 0 || iid == vmIntrinsics::_invokeBasic, "must be _invokeBasic or a linkTo intrinsic");
244 if (ref_kind == 0 || MethodHandles::ref_kind_has_receiver(ref_kind)) {
245 __ ld(param_size, in_bytes(Method::const_offset()), R19_method);
246 __ load_sized_value(param_size, in_bytes(ConstMethod::size_of_parameters_offset()), param_size,
247 sizeof(u2), /*is_signed*/ false);
248 // assert(sizeof(u2) == sizeof(ConstMethod::_size_of_parameters), "");
249 } else {
250 DEBUG_ONLY(param_size = noreg);
251 }
252
253 Register tmp_mh = noreg;
254 if (!is_signature_polymorphic_static(iid)) {
255 __ ld(tmp_mh = temp1, __ argument_offset(param_size, param_size, 0), argbase);
256 DEBUG_ONLY(param_size = noreg);
257 }
258
259 if (TraceMethodHandles) {
260 if (tmp_mh != noreg) {
261 __ mr(R23_method_handle, tmp_mh); // make stub happy
262 }
263 trace_method_handle_interpreter_entry(_masm, iid);
264 }
265
266 if (iid == vmIntrinsics::_invokeBasic) {
267 generate_method_handle_dispatch(_masm, iid, tmp_mh, noreg, not_for_compiler_entry);
268
269 } else {
270 // Adjust argument list by popping the trailing MemberName argument.
271 Register tmp_recv = noreg;
272 if (MethodHandles::ref_kind_has_receiver(ref_kind)) {
273 // Load the receiver (not the MH; the actual MemberName's receiver) up from the interpreter stack.
274 __ ld(tmp_recv = temp1, __ argument_offset(param_size, param_size, 0), argbase);
275 DEBUG_ONLY(param_size = noreg);
276 }
277 Register R19_member = R19_method; // MemberName ptr; incoming method ptr is dead now
278 __ ld(R19_member, RegisterOrConstant((intptr_t)8), argbase);
279 __ add(argbase, Interpreter::stackElementSize, argbase);
280 generate_method_handle_dispatch(_masm, iid, tmp_recv, R19_member, not_for_compiler_entry);
281 }
282
283 return entry_point;
284 }
285
286 void MethodHandles::generate_method_handle_dispatch(MacroAssembler* _masm,
287 vmIntrinsics::ID iid,
288 Register receiver_reg,
289 Register member_reg,
290 bool for_compiler_entry) {
291 assert(is_signature_polymorphic(iid), "expected invoke iid");
292 Register temp1 = (for_compiler_entry ? R25_tmp5 : R7);
293 Register temp2 = (for_compiler_entry ? R22_tmp2 : R8);
294 Register temp3 = (for_compiler_entry ? R23_tmp3 : R9);
295 Register temp4 = (for_compiler_entry ? R24_tmp4 : R10);
296 if (receiver_reg != noreg) assert_different_registers(temp1, temp2, temp3, temp4, receiver_reg);
297 if (member_reg != noreg) assert_different_registers(temp1, temp2, temp3, temp4, member_reg);
298
299 if (iid == vmIntrinsics::_invokeBasic) {
300 // indirect through MH.form.vmentry.vmtarget
301 jump_to_lambda_form(_masm, receiver_reg, R19_method, temp1, temp2, for_compiler_entry);
302 } else {
303 // The method is a member invoker used by direct method handles.
304 if (VerifyMethodHandles) {
305 // make sure the trailing argument really is a MemberName (caller responsibility)
306 verify_klass(_masm, member_reg, SystemDictionary::WK_KLASS_ENUM_NAME(MemberName_klass),
307 temp1, temp2,
308 "MemberName required for invokeVirtual etc.");
309 }
310
311 Register temp1_recv_klass = temp1;
312 if (iid != vmIntrinsics::_linkToStatic) {
313 __ verify_oop(receiver_reg);
314 if (iid == vmIntrinsics::_linkToSpecial) {
315 // Don't actually load the klass; just null-check the receiver.
316 __ null_check_throw(receiver_reg, -1, temp1,
317 Interpreter::throw_NullPointerException_entry());
318 } else {
319 // load receiver klass itself
320 __ null_check_throw(receiver_reg, oopDesc::klass_offset_in_bytes(), temp1,
321 Interpreter::throw_NullPointerException_entry());
322 __ load_klass(temp1_recv_klass, receiver_reg);
323 __ verify_klass_ptr(temp1_recv_klass);
324 }
325 BLOCK_COMMENT("check_receiver {");
326 // The receiver for the MemberName must be in receiver_reg.
327 // Check the receiver against the MemberName.clazz
328 if (VerifyMethodHandles && iid == vmIntrinsics::_linkToSpecial) {
329 // Did not load it above...
330 __ load_klass(temp1_recv_klass, receiver_reg);
331 __ verify_klass_ptr(temp1_recv_klass);
332 }
333 if (VerifyMethodHandles && iid != vmIntrinsics::_linkToInterface) {
334 Label L_ok;
335 Register temp2_defc = temp2;
336 __ load_heap_oop_not_null(temp2_defc, NONZERO(java_lang_invoke_MemberName::clazz_offset_in_bytes()), member_reg, temp3);
337 load_klass_from_Class(_masm, temp2_defc, temp3, temp4);
338 __ verify_klass_ptr(temp2_defc);
339 __ check_klass_subtype(temp1_recv_klass, temp2_defc, temp3, temp4, L_ok);
340 // If we get here, the type check failed!
341 __ stop("receiver class disagrees with MemberName.clazz");
342 __ BIND(L_ok);
343 }
344 BLOCK_COMMENT("} check_receiver");
345 }
346 if (iid == vmIntrinsics::_linkToSpecial ||
347 iid == vmIntrinsics::_linkToStatic) {
348 DEBUG_ONLY(temp1_recv_klass = noreg); // these guys didn't load the recv_klass
349 }
350
351 // Live registers at this point:
352 // member_reg - MemberName that was the trailing argument
353 // temp1_recv_klass - klass of stacked receiver, if needed
354 // O5_savedSP - interpreter linkage (if interpreted)
355 // O0..O5 - compiler arguments (if compiled)
356
357 Label L_incompatible_class_change_error;
358 switch (iid) {
359 case vmIntrinsics::_linkToSpecial:
360 if (VerifyMethodHandles) {
361 verify_ref_kind(_masm, JVM_REF_invokeSpecial, member_reg, temp2);
362 }
363 __ ld(R19_method, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes()), member_reg);
364 break;
365
366 case vmIntrinsics::_linkToStatic:
367 if (VerifyMethodHandles) {
368 verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp2);
369 }
370 __ ld(R19_method, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes()), member_reg);
371 break;
372
373 case vmIntrinsics::_linkToVirtual:
374 {
375 // same as TemplateTable::invokevirtual,
376 // minus the CP setup and profiling:
377
378 if (VerifyMethodHandles) {
379 verify_ref_kind(_masm, JVM_REF_invokeVirtual, member_reg, temp2);
380 }
381
382 // pick out the vtable index from the MemberName, and then we can discard it:
383 Register temp2_index = temp2;
384 __ ld(temp2_index, NONZERO(java_lang_invoke_MemberName::vmindex_offset_in_bytes()), member_reg);
385
386 if (VerifyMethodHandles) {
387 Label L_index_ok;
388 __ cmpdi(CCR1, temp2_index, 0);
389 __ bge(CCR1, L_index_ok);
390 __ stop("no virtual index");
391 __ BIND(L_index_ok);
392 }
393
394 // Note: The verifier invariants allow us to ignore MemberName.clazz and vmtarget
395 // at this point. And VerifyMethodHandles has already checked clazz, if needed.
396
397 // get target Method* & entry point
398 __ lookup_virtual_method(temp1_recv_klass, temp2_index, R19_method);
399 break;
400 }
401
402 case vmIntrinsics::_linkToInterface:
403 {
404 // same as TemplateTable::invokeinterface
405 // (minus the CP setup and profiling, with different argument motion)
406 if (VerifyMethodHandles) {
407 verify_ref_kind(_masm, JVM_REF_invokeInterface, member_reg, temp2);
408 }
409
410 Register temp2_intf = temp2;
411 __ load_heap_oop_not_null(temp2_intf, NONZERO(java_lang_invoke_MemberName::clazz_offset_in_bytes()), member_reg, temp3);
412 load_klass_from_Class(_masm, temp2_intf, temp3, temp4);
413 __ verify_klass_ptr(temp2_intf);
414
415 Register vtable_index = R19_method;
416 __ ld(vtable_index, NONZERO(java_lang_invoke_MemberName::vmindex_offset_in_bytes()), member_reg);
417 if (VerifyMethodHandles) {
418 Label L_index_ok;
419 __ cmpdi(CCR1, vtable_index, 0);
420 __ bge(CCR1, L_index_ok);
421 __ stop("invalid vtable index for MH.invokeInterface");
422 __ BIND(L_index_ok);
423 }
424
425 // given intf, index, and recv klass, dispatch to the implementation method
426 __ lookup_interface_method(temp1_recv_klass, temp2_intf,
427 // note: next two args must be the same:
428 vtable_index, R19_method,
429 temp3, temp4,
430 L_incompatible_class_change_error);
431 break;
432 }
433
434 default:
435 fatal("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid));
436 break;
437 }
438
439 // Live at this point:
440 // R19_method
441 // O5_savedSP (if interpreted)
442
443 // After figuring out which concrete method to call, jump into it.
444 // Note that this works in the interpreter with no data motion.
445 // But the compiled version will require that rcx_recv be shifted out.
446 __ verify_method_ptr(R19_method);
447 jump_from_method_handle(_masm, R19_method, temp1, temp2, for_compiler_entry);
448
449 if (iid == vmIntrinsics::_linkToInterface) {
450 __ BIND(L_incompatible_class_change_error);
451 __ load_const_optimized(temp1, StubRoutines::throw_IncompatibleClassChangeError_entry());
452 __ mtctr(temp1);
453 __ bctr();
454 }
455 }
456 }
457
458 #ifndef PRODUCT
459 void trace_method_handle_stub(const char* adaptername,
460 oopDesc* mh,
461 intptr_t* entry_sp,
462 intptr_t* saved_regs) {
463
464 bool has_mh = (strstr(adaptername, "/static") == NULL &&
465 strstr(adaptername, "linkTo") == NULL); // static linkers don't have MH
466 const char* mh_reg_name = has_mh ? "R23_method_handle" : "G23";
467 tty->print_cr("MH %s %s=" INTPTR_FORMAT " sp=" INTPTR_FORMAT,
468 adaptername, mh_reg_name, p2i(mh), p2i(entry_sp));
469
470 if (Verbose) {
471 tty->print_cr("Registers:");
472 const int abi_offset = frame::abi_reg_args_size / 8;
473 for (int i = R3->encoding(); i <= R12->encoding(); i++) {
474 Register r = as_Register(i);
475 int count = i - R3->encoding();
476 // The registers are stored in reverse order on the stack (by save_volatile_gprs(R1_SP, abi_reg_args_size)).
477 tty->print("%3s=" PTR_FORMAT, r->name(), saved_regs[abi_offset + count]);
478 if ((count + 1) % 4 == 0) {
479 tty->cr();
480 } else {
481 tty->print(", ");
482 }
483 }
484 tty->cr();
485
486 {
487 // dumping last frame with frame::describe
488
489 JavaThread* p = JavaThread::active();
490
491 ResourceMark rm;
492 PRESERVE_EXCEPTION_MARK; // may not be needed by safer and unexpensive here
493 FrameValues values;
494
495 // Note: We want to allow trace_method_handle from any call site.
496 // While trace_method_handle creates a frame, it may be entered
497 // without a PC on the stack top (e.g. not just after a call).
498 // Walking that frame could lead to failures due to that invalid PC.
499 // => carefully detect that frame when doing the stack walking
500
501 // Current C frame
502 frame cur_frame = os::current_frame();
503
504 // Robust search of trace_calling_frame (independant of inlining).
505 assert(cur_frame.sp() <= saved_regs, "registers not saved on stack ?");
506 frame trace_calling_frame = os::get_sender_for_C_frame(&cur_frame);
507 while (trace_calling_frame.fp() < saved_regs) {
508 trace_calling_frame = os::get_sender_for_C_frame(&trace_calling_frame);
509 }
510
511 // Safely create a frame and call frame::describe.
512 intptr_t *dump_sp = trace_calling_frame.sender_sp();
513
514 frame dump_frame = frame(dump_sp);
515 dump_frame.describe(values, 1);
516
517 values.describe(-1, saved_regs, "raw top of stack");
518
519 tty->print_cr("Stack layout:");
520 values.print(p);
521 }
522
523 if (has_mh && mh->is_oop()) {
524 mh->print();
525 if (java_lang_invoke_MethodHandle::is_instance(mh)) {
526 if (java_lang_invoke_MethodHandle::form_offset_in_bytes() != 0)
527 java_lang_invoke_MethodHandle::form(mh)->print();
528 }
529 }
530 }
531 }
532
533 void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) {
534 if (!TraceMethodHandles) return;
535
536 BLOCK_COMMENT("trace_method_handle {");
537
538 const Register tmp = R11; // Will be preserved.
539 const int nbytes_save = MacroAssembler::num_volatile_regs * 8;
540 __ save_volatile_gprs(R1_SP, -nbytes_save); // except R0
541 __ save_LR_CR(tmp); // save in old frame
542
543 __ mr(R5_ARG3, R1_SP); // saved_sp
544 __ push_frame_reg_args(nbytes_save, tmp);
545
546 __ load_const_optimized(R3_ARG1, (address)adaptername, tmp);
547 __ mr(R4_ARG2, R23_method_handle);
548 __ mr(R6_ARG4, R1_SP);
549 __ call_VM_leaf(CAST_FROM_FN_PTR(address, trace_method_handle_stub));
550
551 __ pop_frame();
552 __ restore_LR_CR(tmp);
553 __ restore_volatile_gprs(R1_SP, -nbytes_save); // except R0
554
555 BLOCK_COMMENT("} trace_method_handle");
556 }
557 #endif // PRODUCT