1 /*
2 * Copyright (c) 1997, 2017, 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 "memory/resourceArea.hpp"
32 #include "prims/jvm.h"
33 #include "prims/methodHandles.hpp"
34
35 #define __ _masm->
36
37 #ifdef PRODUCT
38 #define BLOCK_COMMENT(str) // nothing
39 #else
40 #define BLOCK_COMMENT(str) __ block_comment(str)
41 #endif
42
43 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":")
44
45 // Workaround for C++ overloading nastiness on '0' for RegisterOrConstant.
46 inline static RegisterOrConstant constant(int value) {
47 return RegisterOrConstant(value);
48 }
49
50 void MethodHandles::load_klass_from_Class(MacroAssembler* _masm, Register klass_reg,
51 Register temp_reg, Register temp2_reg) {
52 if (VerifyMethodHandles) {
53 verify_klass(_masm, klass_reg, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_Class),
54 temp_reg, temp2_reg, "MH argument is a Class");
55 }
56 __ ld(klass_reg, java_lang_Class::klass_offset_in_bytes(), klass_reg);
57 }
58
59 #ifdef ASSERT
60 static int check_nonzero(const char* xname, int x) {
61 assert(x != 0, "%s should be nonzero", xname);
62 return x;
63 }
64 #define NONZERO(x) check_nonzero(#x, x)
65 #else //ASSERT
66 #define NONZERO(x) (x)
67 #endif //ASSERT
68
69 #ifdef ASSERT
70 void MethodHandles::verify_klass(MacroAssembler* _masm,
71 Register obj_reg, SystemDictionary::WKID klass_id,
72 Register temp_reg, Register temp2_reg,
73 const char* error_message) {
74 InstanceKlass** klass_addr = SystemDictionary::well_known_klass_addr(klass_id);
75 Klass* klass = SystemDictionary::well_known_klass(klass_id);
76 Label L_ok, L_bad;
77 BLOCK_COMMENT("verify_klass {");
78 __ verify_oop(obj_reg);
79 __ cmpdi(CCR0, obj_reg, 0);
80 __ beq(CCR0, L_bad);
81 __ load_klass(temp_reg, obj_reg);
82 __ load_const_optimized(temp2_reg, (address) klass_addr);
83 __ ld(temp2_reg, 0, temp2_reg);
84 __ cmpd(CCR0, temp_reg, temp2_reg);
85 __ beq(CCR0, L_ok);
86 __ ld(temp_reg, klass->super_check_offset(), temp_reg);
87 __ cmpd(CCR0, temp_reg, temp2_reg);
88 __ beq(CCR0, L_ok);
89 __ BIND(L_bad);
90 __ stop(error_message);
91 __ BIND(L_ok);
92 BLOCK_COMMENT("} verify_klass");
93 }
94
95 void MethodHandles::verify_ref_kind(MacroAssembler* _masm, int ref_kind, Register member_reg, Register temp) {
96 Label L;
97 BLOCK_COMMENT("verify_ref_kind {");
98 __ load_sized_value(temp, NONZERO(java_lang_invoke_MemberName::flags_offset_in_bytes()), member_reg,
99 sizeof(u4), /*is_signed*/ false);
100 // assert(sizeof(u4) == sizeof(java.lang.invoke.MemberName.flags), "");
101 __ srwi( temp, temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT);
102 __ andi(temp, temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK);
103 __ cmpwi(CCR1, temp, ref_kind);
104 __ beq(CCR1, L);
105 { char* buf = NEW_C_HEAP_ARRAY(char, 100, mtInternal);
106 jio_snprintf(buf, 100, "verify_ref_kind expected %x", ref_kind);
107 if (ref_kind == JVM_REF_invokeVirtual ||
108 ref_kind == JVM_REF_invokeSpecial)
109 // could do this for all ref_kinds, but would explode assembly code size
110 trace_method_handle(_masm, buf);
111 __ stop(buf);
112 }
113 BLOCK_COMMENT("} verify_ref_kind");
114 __ BIND(L);
115 }
116
117 #endif // ASSERT
118
119 void MethodHandles::jump_from_method_handle(MacroAssembler* _masm, Register method, Register target, Register temp,
120 bool for_compiler_entry) {
121 Label L_no_such_method;
122 assert(method == R19_method, "interpreter calling convention");
123 assert_different_registers(method, target, temp);
124
125 if (!for_compiler_entry && JvmtiExport::can_post_interpreter_events()) {
126 Label run_compiled_code;
127 // JVMTI events, such as single-stepping, are implemented partly by avoiding running
128 // compiled code in threads for which the event is enabled. Check here for
129 // interp_only_mode if these events CAN be enabled.
130 __ verify_thread();
131 __ lwz(temp, in_bytes(JavaThread::interp_only_mode_offset()), R16_thread);
132 __ cmplwi(CCR0, temp, 0);
133 __ beq(CCR0, run_compiled_code);
134 // Null method test is replicated below in compiled case,
135 // it might be able to address across the verify_thread()
136 __ cmplwi(CCR0, R19_method, 0);
137 __ beq(CCR0, L_no_such_method);
138 __ ld(target, in_bytes(Method::interpreter_entry_offset()), R19_method);
139 __ mtctr(target);
140 __ bctr();
141 __ BIND(run_compiled_code);
142 }
143
144 // Compiled case, either static or fall-through from runtime conditional
145 __ cmplwi(CCR0, R19_method, 0);
146 __ beq(CCR0, L_no_such_method);
147
148 const ByteSize entry_offset = for_compiler_entry ? Method::from_compiled_offset() :
149 Method::from_interpreted_offset();
150 __ ld(target, in_bytes(entry_offset), R19_method);
151 __ mtctr(target);
152 __ bctr();
153
154 __ bind(L_no_such_method);
155 assert(StubRoutines::throw_AbstractMethodError_entry() != NULL, "not yet generated!");
156 __ load_const_optimized(target, StubRoutines::throw_AbstractMethodError_entry());
157 __ mtctr(target);
158 __ bctr();
159 }
160
161
162 void MethodHandles::jump_to_lambda_form(MacroAssembler* _masm,
163 Register recv, Register method_temp,
164 Register temp2, Register temp3,
165 bool for_compiler_entry) {
166 BLOCK_COMMENT("jump_to_lambda_form {");
167 // This is the initial entry point of a lazy method handle.
168 // After type checking, it picks up the invoker from the LambdaForm.
169 assert_different_registers(recv, method_temp, temp2); // temp3 is only passed on
170 assert(method_temp == R19_method, "required register for loading method");
171
172 // Load the invoker, as MH -> MH.form -> LF.vmentry
173 __ verify_oop(recv);
174 __ load_heap_oop_not_null(method_temp, NONZERO(java_lang_invoke_MethodHandle::form_offset_in_bytes()), recv, temp2);
175 __ verify_oop(method_temp);
176 __ load_heap_oop_not_null(method_temp, NONZERO(java_lang_invoke_LambdaForm::vmentry_offset_in_bytes()), method_temp, temp2);
177 __ verify_oop(method_temp);
178 __ load_heap_oop_not_null(method_temp, NONZERO(java_lang_invoke_MemberName::method_offset_in_bytes()), method_temp);
179 __ verify_oop(method_temp);
180 __ ld(method_temp, NONZERO(java_lang_invoke_ResolvedMethodName::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), 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 = 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 assert(Method::intrinsic_id_size_in_bytes() == 2, "assuming Method::_intrinsic_id is u2");
227
228 Label L;
229 BLOCK_COMMENT("verify_intrinsic_id {");
230 __ load_sized_value(temp1, Method::intrinsic_id_offset_in_bytes(), R19_method,
231 sizeof(u2), /*is_signed*/ false);
232 __ cmpwi(CCR1, temp1, (int) iid);
233 __ beq(CCR1, L);
234 if (iid == vmIntrinsics::_linkToVirtual ||
235 iid == vmIntrinsics::_linkToSpecial) {
236 // could do this for all kinds, but would explode assembly code size
237 trace_method_handle(_masm, "bad Method*:intrinsic_id");
238 }
239 __ stop("bad Method*::intrinsic_id");
240 __ BIND(L);
241 BLOCK_COMMENT("} verify_intrinsic_id");
242 }
243
244 // First task: Find out how big the argument list is.
245 int ref_kind = signature_polymorphic_intrinsic_ref_kind(iid);
246 assert(ref_kind != 0 || iid == vmIntrinsics::_invokeBasic, "must be _invokeBasic or a linkTo intrinsic");
247 if (ref_kind == 0 || MethodHandles::ref_kind_has_receiver(ref_kind)) {
248 __ ld(param_size, in_bytes(Method::const_offset()), R19_method);
249 __ load_sized_value(param_size, in_bytes(ConstMethod::size_of_parameters_offset()), param_size,
250 sizeof(u2), /*is_signed*/ false);
251 // assert(sizeof(u2) == sizeof(ConstMethod::_size_of_parameters), "");
252 } else {
253 DEBUG_ONLY(param_size = noreg);
254 }
255
256 Register tmp_mh = noreg;
257 if (!is_signature_polymorphic_static(iid)) {
258 __ ld(tmp_mh = temp1, __ argument_offset(param_size, param_size, 0), argbase);
259 DEBUG_ONLY(param_size = noreg);
260 }
261
262 if (TraceMethodHandles) {
263 if (tmp_mh != noreg) {
264 __ mr(R23_method_handle, tmp_mh); // make stub happy
265 }
266 trace_method_handle_interpreter_entry(_masm, iid);
267 }
268
269 if (iid == vmIntrinsics::_invokeBasic) {
270 generate_method_handle_dispatch(_masm, iid, tmp_mh, noreg, not_for_compiler_entry);
271
272 } else {
273 // Adjust argument list by popping the trailing MemberName argument.
274 Register tmp_recv = noreg;
275 if (MethodHandles::ref_kind_has_receiver(ref_kind)) {
276 // Load the receiver (not the MH; the actual MemberName's receiver) up from the interpreter stack.
277 __ ld(tmp_recv = temp1, __ argument_offset(param_size, param_size, 0), argbase);
278 DEBUG_ONLY(param_size = noreg);
279 }
280 Register R19_member = R19_method; // MemberName ptr; incoming method ptr is dead now
281 __ ld(R19_member, RegisterOrConstant((intptr_t)8), argbase);
282 __ add(argbase, Interpreter::stackElementSize, argbase);
283 generate_method_handle_dispatch(_masm, iid, tmp_recv, R19_member, not_for_compiler_entry);
284 }
285
286 return entry_point;
287 }
288
289 void MethodHandles::generate_method_handle_dispatch(MacroAssembler* _masm,
290 vmIntrinsics::ID iid,
291 Register receiver_reg,
292 Register member_reg,
293 bool for_compiler_entry) {
294 assert(is_signature_polymorphic(iid), "expected invoke iid");
295 Register temp1 = (for_compiler_entry ? R25_tmp5 : R7);
296 Register temp2 = (for_compiler_entry ? R22_tmp2 : R8);
297 Register temp3 = (for_compiler_entry ? R23_tmp3 : R9);
298 Register temp4 = (for_compiler_entry ? R24_tmp4 : R10);
299 if (receiver_reg != noreg) assert_different_registers(temp1, temp2, temp3, temp4, receiver_reg);
300 if (member_reg != noreg) assert_different_registers(temp1, temp2, temp3, temp4, member_reg);
301
302 if (iid == vmIntrinsics::_invokeBasic) {
303 // indirect through MH.form.vmentry.vmtarget
304 jump_to_lambda_form(_masm, receiver_reg, R19_method, temp1, temp2, for_compiler_entry);
305 } else {
306 // The method is a member invoker used by direct method handles.
307 if (VerifyMethodHandles) {
308 // make sure the trailing argument really is a MemberName (caller responsibility)
309 verify_klass(_masm, member_reg, SystemDictionary::WK_KLASS_ENUM_NAME(MemberName_klass),
310 temp1, temp2,
311 "MemberName required for invokeVirtual etc.");
312 }
313
314 Register temp1_recv_klass = temp1;
315 if (iid != vmIntrinsics::_linkToStatic) {
316 __ verify_oop(receiver_reg);
317 if (iid == vmIntrinsics::_linkToSpecial) {
318 // Don't actually load the klass; just null-check the receiver.
319 __ null_check_throw(receiver_reg, -1, temp1,
320 Interpreter::throw_NullPointerException_entry());
321 } else {
322 // load receiver klass itself
323 __ null_check_throw(receiver_reg, oopDesc::klass_offset_in_bytes(), temp1,
324 Interpreter::throw_NullPointerException_entry());
325 __ load_klass(temp1_recv_klass, receiver_reg);
326 __ verify_klass_ptr(temp1_recv_klass);
327 }
328 BLOCK_COMMENT("check_receiver {");
329 // The receiver for the MemberName must be in receiver_reg.
330 // Check the receiver against the MemberName.clazz
331 if (VerifyMethodHandles && iid == vmIntrinsics::_linkToSpecial) {
332 // Did not load it above...
333 __ load_klass(temp1_recv_klass, receiver_reg);
334 __ verify_klass_ptr(temp1_recv_klass);
335 }
336 if (VerifyMethodHandles && iid != vmIntrinsics::_linkToInterface) {
337 Label L_ok;
338 Register temp2_defc = temp2;
339 __ load_heap_oop_not_null(temp2_defc, NONZERO(java_lang_invoke_MemberName::clazz_offset_in_bytes()), member_reg, temp3);
340 load_klass_from_Class(_masm, temp2_defc, temp3, temp4);
341 __ verify_klass_ptr(temp2_defc);
342 __ check_klass_subtype(temp1_recv_klass, temp2_defc, temp3, temp4, L_ok);
343 // If we get here, the type check failed!
344 __ stop("receiver class disagrees with MemberName.clazz");
345 __ BIND(L_ok);
346 }
347 BLOCK_COMMENT("} check_receiver");
348 }
349 if (iid == vmIntrinsics::_linkToSpecial ||
350 iid == vmIntrinsics::_linkToStatic) {
351 DEBUG_ONLY(temp1_recv_klass = noreg); // these guys didn't load the recv_klass
352 }
353
354 // Live registers at this point:
355 // member_reg - MemberName that was the trailing argument
356 // temp1_recv_klass - klass of stacked receiver, if needed
357 // O5_savedSP - interpreter linkage (if interpreted)
358 // O0..O5 - compiler arguments (if compiled)
359
360 Label L_incompatible_class_change_error;
361 switch (iid) {
362 case vmIntrinsics::_linkToSpecial:
363 if (VerifyMethodHandles) {
364 verify_ref_kind(_masm, JVM_REF_invokeSpecial, member_reg, temp2);
365 }
366 __ load_heap_oop(member_reg, NONZERO(java_lang_invoke_MemberName::method_offset_in_bytes()), member_reg);
367 __ ld(R19_method, NONZERO(java_lang_invoke_ResolvedMethodName::vmtarget_offset_in_bytes()), member_reg);
368 break;
369
370 case vmIntrinsics::_linkToStatic:
371 if (VerifyMethodHandles) {
372 verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp2);
373 }
374 __ load_heap_oop(member_reg, NONZERO(java_lang_invoke_MemberName::method_offset_in_bytes()), member_reg);
375 __ ld(R19_method, NONZERO(java_lang_invoke_ResolvedMethodName::vmtarget_offset_in_bytes()), member_reg);
376 break;
377
378 case vmIntrinsics::_linkToVirtual:
379 {
380 // same as TemplateTable::invokevirtual,
381 // minus the CP setup and profiling:
382
383 if (VerifyMethodHandles) {
384 verify_ref_kind(_masm, JVM_REF_invokeVirtual, member_reg, temp2);
385 }
386
387 // pick out the vtable index from the MemberName, and then we can discard it:
388 Register temp2_index = temp2;
389 __ ld(temp2_index, NONZERO(java_lang_invoke_MemberName::vmindex_offset_in_bytes()), member_reg);
390
391 if (VerifyMethodHandles) {
392 Label L_index_ok;
393 __ cmpdi(CCR1, temp2_index, 0);
394 __ bge(CCR1, L_index_ok);
395 __ stop("no virtual index");
396 __ BIND(L_index_ok);
397 }
398
399 // Note: The verifier invariants allow us to ignore MemberName.clazz and vmtarget
400 // at this point. And VerifyMethodHandles has already checked clazz, if needed.
401
402 // get target Method* & entry point
403 __ lookup_virtual_method(temp1_recv_klass, temp2_index, R19_method);
404 break;
405 }
406
407 case vmIntrinsics::_linkToInterface:
408 {
409 // same as TemplateTable::invokeinterface
410 // (minus the CP setup and profiling, with different argument motion)
411 if (VerifyMethodHandles) {
412 verify_ref_kind(_masm, JVM_REF_invokeInterface, member_reg, temp2);
413 }
414
415 Register temp2_intf = temp2;
416 __ load_heap_oop_not_null(temp2_intf, NONZERO(java_lang_invoke_MemberName::clazz_offset_in_bytes()), member_reg, temp3);
417 load_klass_from_Class(_masm, temp2_intf, temp3, temp4);
418 __ verify_klass_ptr(temp2_intf);
419
420 Register vtable_index = R19_method;
421 __ ld(vtable_index, NONZERO(java_lang_invoke_MemberName::vmindex_offset_in_bytes()), member_reg);
422 if (VerifyMethodHandles) {
423 Label L_index_ok;
424 __ cmpdi(CCR1, vtable_index, 0);
425 __ bge(CCR1, L_index_ok);
426 __ stop("invalid vtable index for MH.invokeInterface");
427 __ BIND(L_index_ok);
428 }
429
430 // given intf, index, and recv klass, dispatch to the implementation method
431 __ lookup_interface_method(temp1_recv_klass, temp2_intf,
432 // note: next two args must be the same:
433 vtable_index, R19_method,
434 temp3, temp4,
435 L_incompatible_class_change_error);
436 break;
437 }
438
439 default:
440 fatal("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid));
441 break;
442 }
443
444 // Live at this point:
445 // R19_method
446 // O5_savedSP (if interpreted)
447
448 // After figuring out which concrete method to call, jump into it.
449 // Note that this works in the interpreter with no data motion.
450 // But the compiled version will require that rcx_recv be shifted out.
451 __ verify_method_ptr(R19_method);
452 jump_from_method_handle(_masm, R19_method, temp1, temp2, for_compiler_entry);
453
454 if (iid == vmIntrinsics::_linkToInterface) {
455 __ BIND(L_incompatible_class_change_error);
456 __ load_const_optimized(temp1, StubRoutines::throw_IncompatibleClassChangeError_entry());
457 __ mtctr(temp1);
458 __ bctr();
459 }
460 }
461 }
462
463 #ifndef PRODUCT
464 void trace_method_handle_stub(const char* adaptername,
465 oopDesc* mh,
466 intptr_t* entry_sp,
467 intptr_t* saved_regs) {
468
469 bool has_mh = (strstr(adaptername, "/static") == NULL &&
470 strstr(adaptername, "linkTo") == NULL); // static linkers don't have MH
471 const char* mh_reg_name = has_mh ? "R23_method_handle" : "G23";
472 tty->print_cr("MH %s %s=" INTPTR_FORMAT " sp=" INTPTR_FORMAT,
473 adaptername, mh_reg_name, p2i(mh), p2i(entry_sp));
474
475 if (Verbose) {
476 tty->print_cr("Registers:");
477 const int abi_offset = frame::abi_reg_args_size / 8;
478 for (int i = R3->encoding(); i <= R12->encoding(); i++) {
479 Register r = as_Register(i);
480 int count = i - R3->encoding();
481 // The registers are stored in reverse order on the stack (by save_volatile_gprs(R1_SP, abi_reg_args_size)).
482 tty->print("%3s=" PTR_FORMAT, r->name(), saved_regs[abi_offset + count]);
483 if ((count + 1) % 4 == 0) {
484 tty->cr();
485 } else {
486 tty->print(", ");
487 }
488 }
489 tty->cr();
490
491 {
492 // dumping last frame with frame::describe
493
494 JavaThread* p = JavaThread::active();
495
496 ResourceMark rm;
497 PRESERVE_EXCEPTION_MARK; // may not be needed by safer and unexpensive here
498 FrameValues values;
499
500 // Note: We want to allow trace_method_handle from any call site.
501 // While trace_method_handle creates a frame, it may be entered
502 // without a PC on the stack top (e.g. not just after a call).
503 // Walking that frame could lead to failures due to that invalid PC.
504 // => carefully detect that frame when doing the stack walking
505
506 // Current C frame
507 frame cur_frame = os::current_frame();
508
509 // Robust search of trace_calling_frame (independant of inlining).
510 assert(cur_frame.sp() <= saved_regs, "registers not saved on stack ?");
511 frame trace_calling_frame = os::get_sender_for_C_frame(&cur_frame);
512 while (trace_calling_frame.fp() < saved_regs) {
513 trace_calling_frame = os::get_sender_for_C_frame(&trace_calling_frame);
514 }
515
516 // Safely create a frame and call frame::describe.
517 intptr_t *dump_sp = trace_calling_frame.sender_sp();
518
519 frame dump_frame = frame(dump_sp);
520 dump_frame.describe(values, 1);
521
522 values.describe(-1, saved_regs, "raw top of stack");
523
524 tty->print_cr("Stack layout:");
525 values.print(p);
526 }
527
528 if (has_mh && mh->is_oop()) {
529 mh->print();
530 if (java_lang_invoke_MethodHandle::is_instance(mh)) {
531 if (java_lang_invoke_MethodHandle::form_offset_in_bytes() != 0)
532 java_lang_invoke_MethodHandle::form(mh)->print();
533 }
534 }
535 }
536 }
537
538 void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) {
539 if (!TraceMethodHandles) return;
540
541 BLOCK_COMMENT("trace_method_handle {");
542
543 const Register tmp = R11; // Will be preserved.
544 const int nbytes_save = MacroAssembler::num_volatile_regs * 8;
545 __ save_volatile_gprs(R1_SP, -nbytes_save); // except R0
546 __ save_LR_CR(tmp); // save in old frame
547
548 __ mr(R5_ARG3, R1_SP); // saved_sp
549 __ push_frame_reg_args(nbytes_save, tmp);
550
551 __ load_const_optimized(R3_ARG1, (address)adaptername, tmp);
552 __ mr(R4_ARG2, R23_method_handle);
553 __ mr(R6_ARG4, R1_SP);
554 __ call_VM_leaf(CAST_FROM_FN_PTR(address, trace_method_handle_stub));
555
556 __ pop_frame();
557 __ restore_LR_CR(tmp);
558 __ restore_volatile_gprs(R1_SP, -nbytes_save); // except R0
559
560 BLOCK_COMMENT("} trace_method_handle");
561 }
562 #endif // PRODUCT