1 /*
2 * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
3 * Copyright 2012, 2014 SAP AG. 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 "interpreter/interpreter.hpp"
29 #include "memory/allocation.inline.hpp"
30 #include "prims/methodHandles.hpp"
31
32 #define __ _masm->
33
34 #ifdef CC_INTERP
35 #define EXCEPTION_ENTRY StubRoutines::throw_NullPointerException_at_call_entry()
36 #else
37 #define EXCEPTION_ENTRY Interpreter::throw_NullPointerException_entry()
38 #endif
39
40 #ifdef PRODUCT
41 #define BLOCK_COMMENT(str) // nothing
42 #else
43 #define BLOCK_COMMENT(str) __ block_comment(str)
44 #endif
45
46 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":")
47
48 // Workaround for C++ overloading nastiness on '0' for RegisterOrConstant.
49 inline static RegisterOrConstant constant(int value) {
50 return RegisterOrConstant(value);
51 }
52
53 void MethodHandles::load_klass_from_Class(MacroAssembler* _masm, Register klass_reg, Register temp_reg, Register temp2_reg) {
54 if (VerifyMethodHandles)
55 verify_klass(_masm, klass_reg, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_Class), temp_reg, temp2_reg,
56 "MH argument is a Class");
57 __ ld(klass_reg, java_lang_Class::klass_offset_in_bytes(), klass_reg);
58 }
59
60 #ifdef ASSERT
61 static int check_nonzero(const char* xname, int x) {
62 assert(x != 0, err_msg("%s should be nonzero", xname));
63 return x;
64 }
65 #define NONZERO(x) check_nonzero(#x, x)
66 #else //ASSERT
67 #define NONZERO(x) (x)
68 #endif //ASSERT
69
70 #ifdef ASSERT
71 void MethodHandles::verify_klass(MacroAssembler* _masm,
72 Register obj_reg, SystemDictionary::WKID klass_id,
73 Register temp_reg, Register temp2_reg,
74 const char* error_message) {
75 Klass** klass_addr = SystemDictionary::well_known_klass_addr(klass_id);
76 KlassHandle klass = SystemDictionary::well_known_klass(klass_id);
77 Label L_ok, L_bad;
78 BLOCK_COMMENT("verify_klass {");
79 __ verify_oop(obj_reg);
80 __ cmpdi(CCR0, obj_reg, 0);
81 __ beq(CCR0, L_bad);
82 __ load_klass(temp_reg, obj_reg);
83 __ load_const_optimized(temp2_reg, (address) klass_addr);
84 __ ld(temp2_reg, 0, temp2_reg);
85 __ cmpd(CCR0, temp_reg, temp2_reg);
86 __ beq(CCR0, L_ok);
87 __ ld(temp_reg, klass->super_check_offset(), temp_reg);
88 __ cmpd(CCR0, temp_reg, temp2_reg);
89 __ beq(CCR0, L_ok);
90 __ BIND(L_bad);
91 __ stop(error_message);
92 __ BIND(L_ok);
93 BLOCK_COMMENT("} verify_klass");
94 }
95
96 void MethodHandles::verify_ref_kind(MacroAssembler* _masm, int ref_kind, Register member_reg, Register temp) {
97 Label L;
98 BLOCK_COMMENT("verify_ref_kind {");
99 __ load_sized_value(temp, NONZERO(java_lang_invoke_MemberName::flags_offset_in_bytes()), member_reg,
100 sizeof(u4), /*is_signed*/ false);
101 // assert(sizeof(u4) == sizeof(java.lang.invoke.MemberName.flags), "");
102 __ srwi( temp, temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT);
103 __ andi(temp, temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK);
104 __ cmpwi(CCR1, temp, ref_kind);
105 __ beq(CCR1, L);
106 { char* buf = NEW_C_HEAP_ARRAY(char, 100, mtInternal);
107 jio_snprintf(buf, 100, "verify_ref_kind expected %x", 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, buf);
112 __ stop(buf);
113 }
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 __ verify_thread();
132 __ lwz(temp, in_bytes(JavaThread::interp_only_mode_offset()), R16_thread);
133 __ cmplwi(CCR0, temp, 0);
134 __ beq(CCR0, run_compiled_code);
135 // Null method test is replicated below in compiled case,
136 // it might be able to address across the verify_thread()
137 __ cmplwi(CCR0, R19_method, 0);
138 __ beq(CCR0, L_no_such_method);
139 __ ld(target, in_bytes(Method::interpreter_entry_offset()), R19_method);
140 __ mtctr(target);
141 __ bctr();
142 __ BIND(run_compiled_code);
143 }
144
145 // Compiled case, either static or fall-through from runtime conditional
146 __ cmplwi(CCR0, R19_method, 0);
147 __ beq(CCR0, L_no_such_method);
148
149 const ByteSize entry_offset = for_compiler_entry ? Method::from_compiled_offset() :
150 Method::from_interpreted_offset();
151 __ ld(target, in_bytes(entry_offset), R19_method);
152 __ mtctr(target);
153 __ bctr();
154
155 __ bind(L_no_such_method);
156 assert(StubRoutines::throw_AbstractMethodError_entry() != NULL, "not yet generated!");
157 __ load_const_optimized(target, StubRoutines::throw_AbstractMethodError_entry());
158 __ mtctr(target);
159 __ bctr();
160 }
161
162
163 void MethodHandles::jump_to_lambda_form(MacroAssembler* _masm,
164 Register recv, Register method_temp,
165 Register temp2, Register temp3,
166 bool for_compiler_entry) {
167 BLOCK_COMMENT("jump_to_lambda_form {");
168 // This is the initial entry point of a lazy method handle.
169 // After type checking, it picks up the invoker from the LambdaForm.
170 assert_different_registers(recv, method_temp, temp2); // temp3 is only passed on
171 assert(method_temp == R19_method, "required register for loading method");
172
173 // Load the invoker, as MH -> MH.form -> LF.vmentry
174 __ verify_oop(recv);
175 __ load_heap_oop_not_null(method_temp, NONZERO(java_lang_invoke_MethodHandle::form_offset_in_bytes()), recv);
176 __ verify_oop(method_temp);
177 __ load_heap_oop_not_null(method_temp, NONZERO(java_lang_invoke_LambdaForm::vmentry_offset_in_bytes()), method_temp);
178 __ verify_oop(method_temp);
179 // the following assumes that a Method* is normally compressed in the vmtarget field:
180 __ ld(method_temp, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes()), method_temp);
181
182 if (VerifyMethodHandles && !for_compiler_entry) {
183 // make sure recv is already on stack
184 __ ld(temp2, in_bytes(Method::const_offset()), method_temp);
185 __ load_sized_value(temp2, in_bytes(ConstMethod::size_of_parameters_offset()), temp2,
186 sizeof(u2), /*is_signed*/ false);
187 // assert(sizeof(u2) == sizeof(ConstMethod::_size_of_parameters), "");
188 Label L;
189 __ ld(temp2, __ argument_offset(temp2, temp2, 0), CC_INTERP_ONLY(R17_tos) NOT_CC_INTERP(R15_esp));
190 __ cmpd(CCR1, temp2, recv);
191 __ beq(CCR1, L);
192 __ stop("receiver not on stack");
193 __ BIND(L);
194 }
195
196 jump_from_method_handle(_masm, method_temp, temp2, temp3, for_compiler_entry);
197 BLOCK_COMMENT("} jump_to_lambda_form");
198 }
199
200
201
202 // Code generation
203 address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* _masm,
204 vmIntrinsics::ID iid) {
205 const bool not_for_compiler_entry = false; // this is the interpreter entry
206 assert(is_signature_polymorphic(iid), "expected invoke iid");
207 if (iid == vmIntrinsics::_invokeGeneric ||
208 iid == vmIntrinsics::_compiledLambdaForm) {
209 // Perhaps surprisingly, the symbolic references visible to Java are not directly used.
210 // They are linked to Java-generated adapters via MethodHandleNatives.linkMethod.
211 // They all allow an appendix argument.
212 __ stop("Should not reach here"); // empty stubs make SG sick
213 return NULL;
214 }
215
216 Register argbase = CC_INTERP_ONLY(R17_tos) NOT_CC_INTERP(R15_esp); // parameter (preserved)
217 Register argslot = R3;
218 Register temp1 = R6;
219 Register param_size = R7;
220
221 // here's where control starts out:
222 __ align(CodeEntryAlignment);
223 address entry_point = __ pc();
224
225 if (VerifyMethodHandles) {
226 Label L;
227 BLOCK_COMMENT("verify_intrinsic_id {");
228 __ load_sized_value(temp1, Method::intrinsic_id_offset_in_bytes(), R19_method,
229 sizeof(u1), /*is_signed*/ false);
230 // assert(sizeof(u1) == sizeof(Method::_intrinsic_id), "");
231 __ cmpwi(CCR1, temp1, (int) iid);
232 __ beq(CCR1, L);
233 if (iid == vmIntrinsics::_linkToVirtual ||
234 iid == vmIntrinsics::_linkToSpecial) {
235 // could do this for all kinds, but would explode assembly code size
236 trace_method_handle(_masm, "bad Method*:intrinsic_id");
237 }
238 __ stop("bad Method*::intrinsic_id");
239 __ BIND(L);
240 BLOCK_COMMENT("} verify_intrinsic_id");
241 }
242
243 // First task: Find out how big the argument list is.
244 int ref_kind = signature_polymorphic_intrinsic_ref_kind(iid);
245 assert(ref_kind != 0 || iid == vmIntrinsics::_invokeBasic, "must be _invokeBasic or a linkTo intrinsic");
246 if (ref_kind == 0 || MethodHandles::ref_kind_has_receiver(ref_kind)) {
247 __ ld(param_size, in_bytes(Method::const_offset()), R19_method);
248 __ load_sized_value(param_size, in_bytes(ConstMethod::size_of_parameters_offset()), param_size,
249 sizeof(u2), /*is_signed*/ false);
250 // assert(sizeof(u2) == sizeof(ConstMethod::_size_of_parameters), "");
251 } else {
252 DEBUG_ONLY(param_size = noreg);
253 }
254
255 Register tmp_mh = noreg;
256 if (!is_signature_polymorphic_static(iid)) {
257 __ ld(tmp_mh = temp1, __ argument_offset(param_size, param_size, 0), argbase);
258 DEBUG_ONLY(param_size = noreg);
259 }
260
261 if (TraceMethodHandles) {
262 if (tmp_mh != noreg)
263 __ mr(R23_method_handle, tmp_mh); // make stub happy
264 trace_method_handle_interpreter_entry(_masm, iid);
265 }
266
267 if (iid == vmIntrinsics::_invokeBasic) {
268 generate_method_handle_dispatch(_masm, iid, tmp_mh, noreg, not_for_compiler_entry);
269
270 } else {
271 // Adjust argument list by popping the trailing MemberName argument.
272 Register tmp_recv = noreg;
273 if (MethodHandles::ref_kind_has_receiver(ref_kind)) {
274 // Load the receiver (not the MH; the actual MemberName's receiver) up from the interpreter stack.
275 __ ld(tmp_recv = temp1, __ argument_offset(param_size, param_size, 0), argbase);
276 DEBUG_ONLY(param_size = noreg);
277 }
278 Register R19_member = R19_method; // MemberName ptr; incoming method ptr is dead now
279 __ ld(R19_member, RegisterOrConstant((intptr_t)8), argbase);
280 __ add(argbase, Interpreter::stackElementSize, argbase);
281 generate_method_handle_dispatch(_masm, iid, tmp_recv, R19_member, not_for_compiler_entry);
282 }
283
284 return entry_point;
285 }
286
287 void MethodHandles::generate_method_handle_dispatch(MacroAssembler* _masm,
288 vmIntrinsics::ID iid,
289 Register receiver_reg,
290 Register member_reg,
291 bool for_compiler_entry) {
292 assert(is_signature_polymorphic(iid), "expected invoke iid");
293 Register temp1 = (for_compiler_entry ? R25_tmp5 : R7);
294 Register temp2 = (for_compiler_entry ? R22_tmp2 : R8);
295 Register temp3 = (for_compiler_entry ? R23_tmp3 : R9);
296 Register temp4 = (for_compiler_entry ? R24_tmp4 : R10);
297 if (receiver_reg != noreg) assert_different_registers(temp1, temp2, temp3, temp4, receiver_reg);
298 if (member_reg != noreg) assert_different_registers(temp1, temp2, temp3, temp4, member_reg);
299
300 if (iid == vmIntrinsics::_invokeBasic) {
301 // indirect through MH.form.vmentry.vmtarget
302 jump_to_lambda_form(_masm, receiver_reg, R19_method, temp1, temp2, for_compiler_entry);
303 } else {
304 // The method is a member invoker used by direct method handles.
305 if (VerifyMethodHandles) {
306 // make sure the trailing argument really is a MemberName (caller responsibility)
307 verify_klass(_masm, member_reg, SystemDictionary::WK_KLASS_ENUM_NAME(MemberName_klass),
308 temp1, temp2,
309 "MemberName required for invokeVirtual etc.");
310 }
311
312 Register temp1_recv_klass = temp1;
313 if (iid != vmIntrinsics::_linkToStatic) {
314 __ verify_oop(receiver_reg);
315 if (iid == vmIntrinsics::_linkToSpecial) {
316 // Don't actually load the klass; just null-check the receiver.
317 __ null_check_throw(receiver_reg, -1, temp1, EXCEPTION_ENTRY);
318 } else {
319 // load receiver klass itself
320 __ null_check_throw(receiver_reg, oopDesc::klass_offset_in_bytes(), temp1, EXCEPTION_ENTRY);
321 __ load_klass(temp1_recv_klass, receiver_reg);
322 __ verify_klass_ptr(temp1_recv_klass);
323 }
324 BLOCK_COMMENT("check_receiver {");
325 // The receiver for the MemberName must be in receiver_reg.
326 // Check the receiver against the MemberName.clazz
327 if (VerifyMethodHandles && iid == vmIntrinsics::_linkToSpecial) {
328 // Did not load it above...
329 __ load_klass(temp1_recv_klass, receiver_reg);
330 __ verify_klass_ptr(temp1_recv_klass);
331 }
332 if (VerifyMethodHandles && iid != vmIntrinsics::_linkToInterface) {
333 Label L_ok;
334 Register temp2_defc = temp2;
335 __ load_heap_oop_not_null(temp2_defc, NONZERO(java_lang_invoke_MemberName::clazz_offset_in_bytes()), member_reg);
336 load_klass_from_Class(_masm, temp2_defc, temp3, temp4);
337 __ verify_klass_ptr(temp2_defc);
338 __ check_klass_subtype(temp1_recv_klass, temp2_defc, temp3, temp4, L_ok);
339 // If we get here, the type check failed!
340 __ stop("receiver class disagrees with MemberName.clazz");
341 __ BIND(L_ok);
342 }
343 BLOCK_COMMENT("} check_receiver");
344 }
345 if (iid == vmIntrinsics::_linkToSpecial ||
346 iid == vmIntrinsics::_linkToStatic) {
347 DEBUG_ONLY(temp1_recv_klass = noreg); // these guys didn't load the recv_klass
348 }
349
350 // Live registers at this point:
351 // member_reg - MemberName that was the trailing argument
352 // temp1_recv_klass - klass of stacked receiver, if needed
353 // O5_savedSP - interpreter linkage (if interpreted)
354 // O0..O5 - compiler arguments (if compiled)
355
356 Label L_incompatible_class_change_error;
357 switch (iid) {
358 case vmIntrinsics::_linkToSpecial:
359 if (VerifyMethodHandles) {
360 verify_ref_kind(_masm, JVM_REF_invokeSpecial, member_reg, temp2);
361 }
362 __ ld(R19_method, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes()), member_reg);
363 break;
364
365 case vmIntrinsics::_linkToStatic:
366 if (VerifyMethodHandles) {
367 verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp2);
368 }
369 __ ld(R19_method, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes()), member_reg);
370 break;
371
372 case vmIntrinsics::_linkToVirtual:
373 {
374 // same as TemplateTable::invokevirtual,
375 // minus the CP setup and profiling:
376
377 if (VerifyMethodHandles) {
378 verify_ref_kind(_masm, JVM_REF_invokeVirtual, member_reg, temp2);
379 }
380
381 // pick out the vtable index from the MemberName, and then we can discard it:
382 Register temp2_index = temp2;
383 __ ld(temp2_index, NONZERO(java_lang_invoke_MemberName::vmindex_offset_in_bytes()), member_reg);
384
385 if (VerifyMethodHandles) {
386 Label L_index_ok;
387 __ cmpdi(CCR1, temp2_index, 0);
388 __ bge(CCR1, L_index_ok);
389 __ stop("no virtual index");
390 __ BIND(L_index_ok);
391 }
392
393 // Note: The verifier invariants allow us to ignore MemberName.clazz and vmtarget
394 // at this point. And VerifyMethodHandles has already checked clazz, if needed.
395
396 // get target Method* & entry point
397 __ lookup_virtual_method(temp1_recv_klass, temp2_index, R19_method);
398 break;
399 }
400
401 case vmIntrinsics::_linkToInterface:
402 {
403 // same as TemplateTable::invokeinterface
404 // (minus the CP setup and profiling, with different argument motion)
405 if (VerifyMethodHandles) {
406 verify_ref_kind(_masm, JVM_REF_invokeInterface, member_reg, temp2);
407 }
408
409 Register temp2_intf = temp2;
410 __ load_heap_oop_not_null(temp2_intf, NONZERO(java_lang_invoke_MemberName::clazz_offset_in_bytes()), member_reg);
411 load_klass_from_Class(_masm, temp2_intf, temp3, temp4);
412 __ verify_klass_ptr(temp2_intf);
413
414 Register vtable_index = R19_method;
415 __ ld(vtable_index, NONZERO(java_lang_invoke_MemberName::vmindex_offset_in_bytes()), member_reg);
416 if (VerifyMethodHandles) {
417 Label L_index_ok;
418 __ cmpdi(CCR1, vtable_index, 0);
419 __ bge(CCR1, L_index_ok);
420 __ stop("invalid vtable index for MH.invokeInterface");
421 __ BIND(L_index_ok);
422 }
423
424 // given intf, index, and recv klass, dispatch to the implementation method
425 __ lookup_interface_method(temp1_recv_klass, temp2_intf,
426 // note: next two args must be the same:
427 vtable_index, R19_method,
428 temp3, temp4,
429 L_incompatible_class_change_error);
430 break;
431 }
432
433 default:
434 fatal(err_msg_res("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid)));
435 break;
436 }
437
438 // Live at this point:
439 // R19_method
440 // O5_savedSP (if interpreted)
441
442 // After figuring out which concrete method to call, jump into it.
443 // Note that this works in the interpreter with no data motion.
444 // But the compiled version will require that rcx_recv be shifted out.
445 __ verify_method_ptr(R19_method);
446 jump_from_method_handle(_masm, R19_method, temp1, temp2, for_compiler_entry);
447
448 if (iid == vmIntrinsics::_linkToInterface) {
449 __ BIND(L_incompatible_class_change_error);
450 __ load_const_optimized(temp1, StubRoutines::throw_IncompatibleClassChangeError_entry());
451 __ mtctr(temp1);
452 __ bctr();
453 }
454 }
455 }
456
457 #ifndef PRODUCT
458 void trace_method_handle_stub(const char* adaptername,
459 oopDesc* mh,
460 intptr_t* entry_sp,
461 intptr_t* saved_regs) {
462
463 bool has_mh = (strstr(adaptername, "/static") == NULL &&
464 strstr(adaptername, "linkTo") == NULL); // static linkers don't have MH
465 const char* mh_reg_name = has_mh ? "R23_method_handle" : "G23";
466 tty->print_cr("MH %s %s="INTPTR_FORMAT " sp=" INTPTR_FORMAT,
467 adaptername, mh_reg_name, (intptr_t) mh, entry_sp);
468
469 if (Verbose) {
470 tty->print_cr("Registers:");
471 const int abi_offset = frame::abi_reg_args_size / 8;
472 for (int i = R3->encoding(); i <= R12->encoding(); i++) {
473 Register r = as_Register(i);
474 int count = i - R3->encoding();
475 // The registers are stored in reverse order on the stack (by save_volatile_gprs(R1_SP, abi_reg_args_size)).
476 tty->print("%3s=" PTR_FORMAT, r->name(), saved_regs[abi_offset + count]);
477 if ((count + 1) % 4 == 0) {
478 tty->cr();
479 } else {
480 tty->print(", ");
481 }
482 }
483 tty->cr();
484
485 {
486 // dumping last frame with frame::describe
487
488 JavaThread* p = JavaThread::active();
489
490 ResourceMark rm;
491 PRESERVE_EXCEPTION_MARK; // may not be needed by safer and unexpensive here
492 FrameValues values;
493
494 // Note: We want to allow trace_method_handle from any call site.
495 // While trace_method_handle creates a frame, it may be entered
496 // without a PC on the stack top (e.g. not just after a call).
497 // Walking that frame could lead to failures due to that invalid PC.
498 // => carefully detect that frame when doing the stack walking
499
500 // Current C frame
501 frame cur_frame = os::current_frame();
502
503 // Robust search of trace_calling_frame (independant of inlining).
504 // Assumes saved_regs comes from a pusha in the trace_calling_frame.
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 int nbytes_save = 10 * 8; // 10 volatile gprs
539 __ save_LR_CR(R0);
540 __ mr(R0, R1_SP); // saved_sp
541 assert(Assembler::is_simm(-nbytes_save, 16), "Overwriting R0");
542 // Push_frame_reg_args only uses R0 if nbytes_save is wider than 16 bit.
543 __ push_frame_reg_args(nbytes_save, R0);
544 __ save_volatile_gprs(R1_SP, frame::abi_reg_args_size); // Except R0.
545
546 __ load_const(R3_ARG1, (address)adaptername);
547 __ mr(R4_ARG2, R23_method_handle);
548 __ mr(R5_ARG3, R0); // saved_sp
549 __ mr(R6_ARG4, R1_SP);
550 __ call_VM_leaf(CAST_FROM_FN_PTR(address, trace_method_handle_stub));
551
552 __ restore_volatile_gprs(R1_SP, 112); // Except R0.
553 __ pop_frame();
554 __ restore_LR_CR(R0);
555
556 BLOCK_COMMENT("} trace_method_handle");
557 }
558 #endif // PRODUCT