1 /*
2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #include "precompiled.hpp"
26 #include "interpreter/interpreter.hpp"
27 #include "interpreter/interpreterRuntime.hpp"
28 #include "memory/allocation.inline.hpp"
29 #include "prims/methodHandles.hpp"
30
31 #define __ _masm->
32
33 #ifdef PRODUCT
34 #define BLOCK_COMMENT(str) /* nothing */
35 #define STOP(error) stop(error)
36 #else
37 #define BLOCK_COMMENT(str) __ block_comment(str)
38 #define STOP(error) block_comment(error); __ stop(error)
39 #endif
40
41 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":")
42
43 // Workaround for C++ overloading nastiness on '0' for RegisterOrConstant.
44 static RegisterOrConstant constant(int value) {
45 return RegisterOrConstant(value);
46 }
47
48 void MethodHandles::load_klass_from_Class(MacroAssembler* _masm, Register klass_reg) {
49 if (VerifyMethodHandles)
50 verify_klass(_masm, klass_reg, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_Class),
51 "MH argument is a Class");
52 __ movptr(klass_reg, Address(klass_reg, java_lang_Class::klass_offset_in_bytes()));
53 }
54
55 #ifdef ASSERT
56 static int check_nonzero(const char* xname, int x) {
57 assert(x != 0, err_msg("%s should be nonzero", xname));
58 return x;
59 }
60 #define NONZERO(x) check_nonzero(#x, x)
61 #else //ASSERT
62 #define NONZERO(x) (x)
63 #endif //ASSERT
64
65 #ifdef ASSERT
66 void MethodHandles::verify_klass(MacroAssembler* _masm,
67 Register obj, SystemDictionary::WKID klass_id,
68 const char* error_message) {
69 Klass** klass_addr = SystemDictionary::well_known_klass_addr(klass_id);
70 KlassHandle klass = SystemDictionary::well_known_klass(klass_id);
71 Register temp = rdi;
72 Register temp2 = noreg;
73 LP64_ONLY(temp2 = rscratch1); // used by MacroAssembler::cmpptr
74 Label L_ok, L_bad;
75 BLOCK_COMMENT("verify_klass {");
76 __ verify_oop(obj);
77 __ testptr(obj, obj);
78 __ jcc(Assembler::zero, L_bad);
79 __ push(temp); if (temp2 != noreg) __ push(temp2);
80 #define UNPUSH { if (temp2 != noreg) __ pop(temp2); __ pop(temp); }
81 __ load_klass(temp, obj);
82 __ cmpptr(temp, ExternalAddress((address) klass_addr));
83 __ jcc(Assembler::equal, L_ok);
84 intptr_t super_check_offset = klass->super_check_offset();
85 __ movptr(temp, Address(temp, super_check_offset));
86 __ cmpptr(temp, ExternalAddress((address) klass_addr));
87 __ jcc(Assembler::equal, L_ok);
88 UNPUSH;
89 __ bind(L_bad);
90 __ STOP(error_message);
91 __ BIND(L_ok);
92 UNPUSH;
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 __ movl(temp, Address(member_reg, NONZERO(java_lang_invoke_MemberName::flags_offset_in_bytes())));
100 __ shrl(temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT);
101 __ andl(temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK);
102 __ cmpl(temp, ref_kind);
103 __ jcc(Assembler::equal, L);
104 { char* buf = NEW_C_HEAP_ARRAY(char, 100, mtInternal);
105 jio_snprintf(buf, 100, "verify_ref_kind expected %x", ref_kind);
106 if (ref_kind == JVM_REF_invokeVirtual ||
107 ref_kind == JVM_REF_invokeSpecial)
108 // could do this for all ref_kinds, but would explode assembly code size
109 trace_method_handle(_masm, buf);
110 __ STOP(buf);
111 }
112 BLOCK_COMMENT("} verify_ref_kind");
113 __ bind(L);
114 }
115
116 #endif //ASSERT
117
118 void MethodHandles::jump_from_method_handle(MacroAssembler* _masm, Register method, Register temp,
119 bool for_compiler_entry) {
120 assert(method == rbx, "interpreter calling convention");
121 __ verify_method_ptr(method);
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 #ifdef _LP64
129 Register rthread = r15_thread;
130 #else
131 Register rthread = temp;
132 __ get_thread(rthread);
133 #endif
134 // interp_only is an int, on little endian it is sufficient to test the byte only
135 // Is a cmpl faster?
136 __ cmpb(Address(rthread, JavaThread::interp_only_mode_offset()), 0);
137 __ jccb(Assembler::zero, run_compiled_code);
138 __ jmp(Address(method, Method::interpreter_entry_offset()));
139 __ BIND(run_compiled_code);
140 }
141
142 const ByteSize entry_offset = for_compiler_entry ? Method::from_compiled_offset() :
143 Method::from_interpreted_offset();
144 __ jmp(Address(method, entry_offset));
145 }
146
147 void MethodHandles::jump_to_lambda_form(MacroAssembler* _masm,
148 Register recv, Register method_temp,
149 Register temp2,
150 bool for_compiler_entry) {
151 BLOCK_COMMENT("jump_to_lambda_form {");
152 // This is the initial entry point of a lazy method handle.
153 // After type checking, it picks up the invoker from the LambdaForm.
154 assert_different_registers(recv, method_temp, temp2);
155 assert(recv != noreg, "required register");
156 assert(method_temp == rbx, "required register for loading method");
157
158 //NOT_PRODUCT({ FlagSetting fs(TraceMethodHandles, true); trace_method_handle(_masm, "LZMH"); });
159
160 // Load the invoker, as MH -> MH.form -> LF.vmentry
161 __ verify_oop(recv);
162 __ load_heap_oop(method_temp, Address(recv, NONZERO(java_lang_invoke_MethodHandle::form_offset_in_bytes())));
163 __ verify_oop(method_temp);
164 __ load_heap_oop(method_temp, Address(method_temp, NONZERO(java_lang_invoke_LambdaForm::vmentry_offset_in_bytes())));
165 __ verify_oop(method_temp);
166 // the following assumes that a Method* is normally compressed in the vmtarget field:
167 __ movptr(method_temp, Address(method_temp, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes())));
168
169 if (VerifyMethodHandles && !for_compiler_entry) {
170 // make sure recv is already on stack
171 __ movptr(temp2, Address(method_temp, Method::const_offset()));
172 __ load_sized_value(temp2,
173 Address(temp2, ConstMethod::size_of_parameters_offset()),
174 sizeof(u2), /*is_signed*/ false);
175 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), "");
176 Label L;
177 __ cmpptr(recv, __ argument_address(temp2, -1));
178 __ jcc(Assembler::equal, L);
179 __ movptr(rax, __ argument_address(temp2, -1));
180 __ STOP("receiver not on stack");
181 __ BIND(L);
182 }
183
184 jump_from_method_handle(_masm, method_temp, temp2, for_compiler_entry);
185 BLOCK_COMMENT("} jump_to_lambda_form");
186 }
187
188
189 // Code generation
190 address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* _masm,
191 vmIntrinsics::ID iid) {
192 const bool not_for_compiler_entry = false; // this is the interpreter entry
193 assert(is_signature_polymorphic(iid), "expected invoke iid");
194 if (iid == vmIntrinsics::_invokeGeneric ||
195 iid == vmIntrinsics::_compiledLambdaForm) {
196 // Perhaps surprisingly, the symbolic references visible to Java are not directly used.
197 // They are linked to Java-generated adapters via MethodHandleNatives.linkMethod.
198 // They all allow an appendix argument.
199 __ hlt(); // empty stubs make SG sick
200 return NULL;
201 }
202
203 // rsi/r13: sender SP (must preserve; see prepare_to_jump_from_interpreted)
204 // rbx: Method*
205 // rdx: argument locator (parameter slot count, added to rsp)
206 // rcx: used as temp to hold mh or receiver
207 // rax, rdi: garbage temps, blown away
208 Register rdx_argp = rdx; // argument list ptr, live on error paths
209 Register rax_temp = rax;
210 Register rcx_mh = rcx; // MH receiver; dies quickly and is recycled
211 Register rbx_method = rbx; // eventual target of this invocation
212
213 // here's where control starts out:
214 __ align(CodeEntryAlignment);
215 address entry_point = __ pc();
216
217 if (VerifyMethodHandles) {
218 Label L;
219 BLOCK_COMMENT("verify_intrinsic_id {");
220 __ cmpb(Address(rbx_method, Method::intrinsic_id_offset_in_bytes()), (int) iid);
221 __ jcc(Assembler::equal, L);
222 if (iid == vmIntrinsics::_linkToVirtual ||
223 iid == vmIntrinsics::_linkToSpecial) {
224 // could do this for all kinds, but would explode assembly code size
225 trace_method_handle(_masm, "bad Method*::intrinsic_id");
226 }
227 __ STOP("bad Method*::intrinsic_id");
228 __ bind(L);
229 BLOCK_COMMENT("} verify_intrinsic_id");
230 }
231
232 // First task: Find out how big the argument list is.
233 Address rdx_first_arg_addr;
234 int ref_kind = signature_polymorphic_intrinsic_ref_kind(iid);
235 assert(ref_kind != 0 || iid == vmIntrinsics::_invokeBasic, "must be _invokeBasic or a linkTo intrinsic");
236 if (ref_kind == 0 || MethodHandles::ref_kind_has_receiver(ref_kind)) {
237 __ movptr(rdx_argp, Address(rbx_method, Method::const_offset()));
238 __ load_sized_value(rdx_argp,
239 Address(rdx_argp, ConstMethod::size_of_parameters_offset()),
240 sizeof(u2), /*is_signed*/ false);
241 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), "");
242 rdx_first_arg_addr = __ argument_address(rdx_argp, -1);
243 } else {
244 DEBUG_ONLY(rdx_argp = noreg);
245 }
246
247 if (!is_signature_polymorphic_static(iid)) {
248 __ movptr(rcx_mh, rdx_first_arg_addr);
249 DEBUG_ONLY(rdx_argp = noreg);
250 }
251
252 // rdx_first_arg_addr is live!
253
254 trace_method_handle_interpreter_entry(_masm, iid);
255
256 if (iid == vmIntrinsics::_invokeBasic) {
257 generate_method_handle_dispatch(_masm, iid, rcx_mh, noreg, not_for_compiler_entry);
258
259 } else {
260 // Adjust argument list by popping the trailing MemberName argument.
261 Register rcx_recv = noreg;
262 if (MethodHandles::ref_kind_has_receiver(ref_kind)) {
263 // Load the receiver (not the MH; the actual MemberName's receiver) up from the interpreter stack.
264 __ movptr(rcx_recv = rcx, rdx_first_arg_addr);
265 }
266 DEBUG_ONLY(rdx_argp = noreg);
267 Register rbx_member = rbx_method; // MemberName ptr; incoming method ptr is dead now
268 __ pop(rax_temp); // return address
269 __ pop(rbx_member); // extract last argument
270 __ push(rax_temp); // re-push return address
271 generate_method_handle_dispatch(_masm, iid, rcx_recv, rbx_member, not_for_compiler_entry);
272 }
273
274 return entry_point;
275 }
276
277 void MethodHandles::generate_method_handle_dispatch(MacroAssembler* _masm,
278 vmIntrinsics::ID iid,
279 Register receiver_reg,
280 Register member_reg,
281 bool for_compiler_entry) {
282 assert(is_signature_polymorphic(iid), "expected invoke iid");
283 Register rbx_method = rbx; // eventual target of this invocation
284 // temps used in this code are not used in *either* compiled or interpreted calling sequences
285 #ifdef _LP64
286 Register temp1 = rscratch1;
287 Register temp2 = rscratch2;
288 Register temp3 = rax;
289 if (for_compiler_entry) {
290 assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : j_rarg0), "only valid assignment");
291 assert_different_registers(temp1, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5);
292 assert_different_registers(temp2, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5);
293 assert_different_registers(temp3, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5);
294 }
295 #else
296 Register temp1 = (for_compiler_entry ? rsi : rdx);
297 Register temp2 = rdi;
298 Register temp3 = rax;
299 if (for_compiler_entry) {
300 assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : rcx), "only valid assignment");
301 assert_different_registers(temp1, rcx, rdx);
302 assert_different_registers(temp2, rcx, rdx);
303 assert_different_registers(temp3, rcx, rdx);
304 }
305 #endif
306 else {
307 assert_different_registers(temp1, temp2, temp3, saved_last_sp_register()); // don't trash lastSP
308 }
309 assert_different_registers(temp1, temp2, temp3, receiver_reg);
310 assert_different_registers(temp1, temp2, temp3, member_reg);
311
312 if (iid == vmIntrinsics::_invokeBasic) {
313 // indirect through MH.form.vmentry.vmtarget
314 jump_to_lambda_form(_masm, receiver_reg, rbx_method, temp1, for_compiler_entry);
315
316 } else {
317 // The method is a member invoker used by direct method handles.
318 if (VerifyMethodHandles) {
319 // make sure the trailing argument really is a MemberName (caller responsibility)
320 verify_klass(_masm, member_reg, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_invoke_MemberName),
321 "MemberName required for invokeVirtual etc.");
322 }
323
324 Address member_clazz( member_reg, NONZERO(java_lang_invoke_MemberName::clazz_offset_in_bytes()));
325 Address member_vmindex( member_reg, NONZERO(java_lang_invoke_MemberName::vmindex_offset_in_bytes()));
326 Address member_vmtarget( member_reg, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes()));
327
328 Register temp1_recv_klass = temp1;
329 if (iid != vmIntrinsics::_linkToStatic) {
330 __ verify_oop(receiver_reg);
331 if (iid == vmIntrinsics::_linkToSpecial) {
332 // Don't actually load the klass; just null-check the receiver.
333 __ null_check(receiver_reg);
334 } else {
335 // load receiver klass itself
336 __ null_check(receiver_reg, oopDesc::klass_offset_in_bytes());
337 __ load_klass(temp1_recv_klass, receiver_reg);
338 __ verify_klass_ptr(temp1_recv_klass);
339 }
340 BLOCK_COMMENT("check_receiver {");
341 // The receiver for the MemberName must be in receiver_reg.
342 // Check the receiver against the MemberName.clazz
343 if (VerifyMethodHandles && iid == vmIntrinsics::_linkToSpecial) {
344 // Did not load it above...
345 __ load_klass(temp1_recv_klass, receiver_reg);
346 __ verify_klass_ptr(temp1_recv_klass);
347 }
348 if (VerifyMethodHandles && iid != vmIntrinsics::_linkToInterface) {
349 Label L_ok;
350 Register temp2_defc = temp2;
351 __ load_heap_oop(temp2_defc, member_clazz);
352 load_klass_from_Class(_masm, temp2_defc);
353 __ verify_klass_ptr(temp2_defc);
354 __ check_klass_subtype(temp1_recv_klass, temp2_defc, temp3, L_ok);
355 // If we get here, the type check failed!
356 __ STOP("receiver class disagrees with MemberName.clazz");
357 __ bind(L_ok);
358 }
359 BLOCK_COMMENT("} check_receiver");
360 }
361 if (iid == vmIntrinsics::_linkToSpecial ||
362 iid == vmIntrinsics::_linkToStatic) {
363 DEBUG_ONLY(temp1_recv_klass = noreg); // these guys didn't load the recv_klass
364 }
365
366 // Live registers at this point:
367 // member_reg - MemberName that was the trailing argument
368 // temp1_recv_klass - klass of stacked receiver, if needed
369 // rsi/r13 - interpreter linkage (if interpreted)
370 // rcx, rdx, rsi, rdi, r8, r8 - compiler arguments (if compiled)
371
372 Label L_incompatible_class_change_error;
373 switch (iid) {
374 case vmIntrinsics::_linkToSpecial:
375 if (VerifyMethodHandles) {
376 verify_ref_kind(_masm, JVM_REF_invokeSpecial, member_reg, temp3);
377 }
378 __ movptr(rbx_method, member_vmtarget);
379 break;
380
381 case vmIntrinsics::_linkToStatic:
382 if (VerifyMethodHandles) {
383 verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp3);
384 }
385 __ movptr(rbx_method, member_vmtarget);
386 break;
387
388 case vmIntrinsics::_linkToVirtual:
389 {
390 // same as TemplateTable::invokevirtual,
391 // minus the CP setup and profiling:
392
393 if (VerifyMethodHandles) {
394 verify_ref_kind(_masm, JVM_REF_invokeVirtual, member_reg, temp3);
395 }
396
397 // pick out the vtable index from the MemberName, and then we can discard it:
398 Register temp2_index = temp2;
399 __ movptr(temp2_index, member_vmindex);
400
401 if (VerifyMethodHandles) {
402 Label L_index_ok;
403 __ cmpl(temp2_index, 0);
404 __ jcc(Assembler::greaterEqual, L_index_ok);
405 __ STOP("no virtual index");
406 __ BIND(L_index_ok);
407 }
408
409 // Note: The verifier invariants allow us to ignore MemberName.clazz and vmtarget
410 // at this point. And VerifyMethodHandles has already checked clazz, if needed.
411
412 // get target Method* & entry point
413 __ lookup_virtual_method(temp1_recv_klass, temp2_index, rbx_method);
414 break;
415 }
416
417 case vmIntrinsics::_linkToInterface:
418 {
419 // same as TemplateTable::invokeinterface
420 // (minus the CP setup and profiling, with different argument motion)
421 if (VerifyMethodHandles) {
422 verify_ref_kind(_masm, JVM_REF_invokeInterface, member_reg, temp3);
423 }
424
425 Register temp3_intf = temp3;
426 __ load_heap_oop(temp3_intf, member_clazz);
427 load_klass_from_Class(_masm, temp3_intf);
428 __ verify_klass_ptr(temp3_intf);
429
430 Register rbx_index = rbx_method;
431 __ movptr(rbx_index, member_vmindex);
432 if (VerifyMethodHandles) {
433 Label L;
434 __ cmpl(rbx_index, 0);
435 __ jcc(Assembler::greaterEqual, L);
436 __ STOP("invalid vtable index for MH.invokeInterface");
437 __ bind(L);
438 }
439
440 // given intf, index, and recv klass, dispatch to the implementation method
441 __ lookup_interface_method(temp1_recv_klass, temp3_intf,
442 // note: next two args must be the same:
443 rbx_index, rbx_method,
444 temp2,
445 L_incompatible_class_change_error);
446 break;
447 }
448
449 default:
450 fatal(err_msg_res("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid)));
451 break;
452 }
453
454 // Live at this point:
455 // rbx_method
456 // rsi/r13 (if interpreted)
457
458 // After figuring out which concrete method to call, jump into it.
459 // Note that this works in the interpreter with no data motion.
460 // But the compiled version will require that rcx_recv be shifted out.
461 __ verify_method_ptr(rbx_method);
462 jump_from_method_handle(_masm, rbx_method, temp1, for_compiler_entry);
463
464 if (iid == vmIntrinsics::_linkToInterface) {
465 __ bind(L_incompatible_class_change_error);
466 __ jump(RuntimeAddress(StubRoutines::throw_IncompatibleClassChangeError_entry()));
467 }
468 }
469 }
470
471 #ifndef PRODUCT
472 void trace_method_handle_stub(const char* adaptername,
473 oop mh,
474 intptr_t* saved_regs,
475 intptr_t* entry_sp) {
476 // called as a leaf from native code: do not block the JVM!
477 bool has_mh = (strstr(adaptername, "/static") == NULL &&
478 strstr(adaptername, "linkTo") == NULL); // static linkers don't have MH
479 const char* mh_reg_name = has_mh ? "rcx_mh" : "rcx";
480 tty->print_cr("MH %s %s="PTR_FORMAT" sp="PTR_FORMAT,
481 adaptername, mh_reg_name,
482 mh, entry_sp);
483
484 if (Verbose) {
485 tty->print_cr("Registers:");
486 const int saved_regs_count = RegisterImpl::number_of_registers;
487 for (int i = 0; i < saved_regs_count; i++) {
488 Register r = as_Register(i);
489 // The registers are stored in reverse order on the stack (by pusha).
490 tty->print("%3s=" PTR_FORMAT, r->name(), saved_regs[((saved_regs_count - 1) - i)]);
491 if ((i + 1) % 4 == 0) {
492 tty->cr();
493 } else {
494 tty->print(", ");
495 }
496 }
497 tty->cr();
498
499 {
500 // dumping last frame with frame::describe
501
502 JavaThread* p = JavaThread::active();
503
504 ResourceMark rm;
505 PRESERVE_EXCEPTION_MARK; // may not be needed by safer and unexpensive here
506 FrameValues values;
507
508 // Note: We want to allow trace_method_handle from any call site.
509 // While trace_method_handle creates a frame, it may be entered
510 // without a PC on the stack top (e.g. not just after a call).
511 // Walking that frame could lead to failures due to that invalid PC.
512 // => carefully detect that frame when doing the stack walking
513
514 // Current C frame
515 frame cur_frame = os::current_frame();
516
517 // Robust search of trace_calling_frame (independant of inlining).
518 // Assumes saved_regs comes from a pusha in the trace_calling_frame.
519 assert(cur_frame.sp() < saved_regs, "registers not saved on stack ?");
520 frame trace_calling_frame = os::get_sender_for_C_frame(&cur_frame);
521 while (trace_calling_frame.fp() < saved_regs) {
522 trace_calling_frame = os::get_sender_for_C_frame(&trace_calling_frame);
523 }
524
525 // safely create a frame and call frame::describe
526 intptr_t *dump_sp = trace_calling_frame.sender_sp();
527 intptr_t *dump_fp = trace_calling_frame.link();
528
529 bool walkable = has_mh; // whether the traced frame shoud be walkable
530
531 if (walkable) {
532 // The previous definition of walkable may have to be refined
533 // if new call sites cause the next frame constructor to start
534 // failing. Alternatively, frame constructors could be
535 // modified to support the current or future non walkable
536 // frames (but this is more intrusive and is not considered as
537 // part of this RFE, which will instead use a simpler output).
538 frame dump_frame = frame(dump_sp, dump_fp);
539 dump_frame.describe(values, 1);
540 } else {
541 // Stack may not be walkable (invalid PC above FP):
542 // Add descriptions without building a Java frame to avoid issues
543 values.describe(-1, dump_fp, "fp for #1 <not parsed, cannot trust pc>");
544 values.describe(-1, dump_sp, "sp for #1");
545 }
546 values.describe(-1, entry_sp, "raw top of stack");
547
548 tty->print_cr("Stack layout:");
549 values.print(p);
550 }
551 if (has_mh && mh->is_oop()) {
552 mh->print();
553 if (java_lang_invoke_MethodHandle::is_instance(mh)) {
554 if (java_lang_invoke_MethodHandle::form_offset_in_bytes() != 0)
555 java_lang_invoke_MethodHandle::form(mh)->print();
556 }
557 }
558 }
559 }
560
561 // The stub wraps the arguments in a struct on the stack to avoid
562 // dealing with the different calling conventions for passing 6
563 // arguments.
564 struct MethodHandleStubArguments {
565 const char* adaptername;
566 oopDesc* mh;
567 intptr_t* saved_regs;
568 intptr_t* entry_sp;
569 };
570 void trace_method_handle_stub_wrapper(MethodHandleStubArguments* args) {
571 trace_method_handle_stub(args->adaptername,
572 args->mh,
573 args->saved_regs,
574 args->entry_sp);
575 }
576
577 void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) {
578 if (!TraceMethodHandles) return;
579 BLOCK_COMMENT("trace_method_handle {");
580 __ enter();
581 __ andptr(rsp, -16); // align stack if needed for FPU state
582 __ pusha();
583 __ mov(rbx, rsp); // for retreiving saved_regs
584 // Note: saved_regs must be in the entered frame for the
585 // robust stack walking implemented in trace_method_handle_stub.
586
587 // save FP result, valid at some call sites (adapter_opt_return_float, ...)
588 __ increment(rsp, -2 * wordSize);
589 if (UseSSE >= 2) {
590 __ movdbl(Address(rsp, 0), xmm0);
591 } else if (UseSSE == 1) {
592 __ movflt(Address(rsp, 0), xmm0);
593 } else {
594 __ fst_d(Address(rsp, 0));
595 }
596
597 // Incoming state:
598 // rcx: method handle
599 //
600 // To avoid calling convention issues, build a record on the stack
601 // and pass the pointer to that instead.
602 __ push(rbp); // entry_sp (with extra align space)
603 __ push(rbx); // pusha saved_regs
604 __ push(rcx); // mh
605 __ push(rcx); // slot for adaptername
606 __ movptr(Address(rsp, 0), (intptr_t) adaptername);
607 __ super_call_VM_leaf(CAST_FROM_FN_PTR(address, trace_method_handle_stub_wrapper), rsp);
608 __ increment(rsp, sizeof(MethodHandleStubArguments));
609
610 if (UseSSE >= 2) {
611 __ movdbl(xmm0, Address(rsp, 0));
612 } else if (UseSSE == 1) {
613 __ movflt(xmm0, Address(rsp, 0));
614 } else {
615 __ fld_d(Address(rsp, 0));
616 }
617 __ increment(rsp, 2 * wordSize);
618
619 __ popa();
620 __ leave();
621 BLOCK_COMMENT("} trace_method_handle");
622 }
623 #endif //PRODUCT