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 __ load_sized_value(temp2,
172 Address(method_temp, Method::size_of_parameters_offset()),
173 sizeof(u2), /*is_signed*/ false);
174 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), "");
175 Label L;
176 __ cmpptr(recv, __ argument_address(temp2, -1));
177 __ jcc(Assembler::equal, L);
178 __ movptr(rax, __ argument_address(temp2, -1));
179 __ STOP("receiver not on stack");
180 __ BIND(L);
181 }
182
183 jump_from_method_handle(_masm, method_temp, temp2, for_compiler_entry);
184 BLOCK_COMMENT("} jump_to_lambda_form");
185 }
186
187
188 // Code generation
189 address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* _masm,
190 vmIntrinsics::ID iid) {
191 const bool not_for_compiler_entry = false; // this is the interpreter entry
192 assert(is_signature_polymorphic(iid), "expected invoke iid");
193 if (iid == vmIntrinsics::_invokeGeneric ||
194 iid == vmIntrinsics::_compiledLambdaForm) {
195 // Perhaps surprisingly, the symbolic references visible to Java are not directly used.
196 // They are linked to Java-generated adapters via MethodHandleNatives.linkMethod.
197 // They all allow an appendix argument.
198 __ hlt(); // empty stubs make SG sick
199 return NULL;
200 }
201
202 // rsi/r13: sender SP (must preserve; see prepare_to_jump_from_interpreted)
203 // rbx: Method*
204 // rdx: argument locator (parameter slot count, added to rsp)
205 // rcx: used as temp to hold mh or receiver
206 // rax, rdi: garbage temps, blown away
207 Register rdx_argp = rdx; // argument list ptr, live on error paths
208 Register rax_temp = rax;
209 Register rcx_mh = rcx; // MH receiver; dies quickly and is recycled
210 Register rbx_method = rbx; // eventual target of this invocation
211
212 // here's where control starts out:
213 __ align(CodeEntryAlignment);
214 address entry_point = __ pc();
215
216 if (VerifyMethodHandles) {
217 Label L;
218 BLOCK_COMMENT("verify_intrinsic_id {");
219 __ cmpb(Address(rbx_method, Method::intrinsic_id_offset_in_bytes()), (int) iid);
220 __ jcc(Assembler::equal, L);
221 if (iid == vmIntrinsics::_linkToVirtual ||
222 iid == vmIntrinsics::_linkToSpecial) {
223 // could do this for all kinds, but would explode assembly code size
224 trace_method_handle(_masm, "bad Method*::intrinsic_id");
225 }
226 __ STOP("bad Method*::intrinsic_id");
227 __ bind(L);
228 BLOCK_COMMENT("} verify_intrinsic_id");
229 }
230
231 // First task: Find out how big the argument list is.
232 Address rdx_first_arg_addr;
233 int ref_kind = signature_polymorphic_intrinsic_ref_kind(iid);
234 assert(ref_kind != 0 || iid == vmIntrinsics::_invokeBasic, "must be _invokeBasic or a linkTo intrinsic");
235 if (ref_kind == 0 || MethodHandles::ref_kind_has_receiver(ref_kind)) {
236 __ load_sized_value(rdx_argp,
237 Address(rbx_method, Method::size_of_parameters_offset()),
238 sizeof(u2), /*is_signed*/ false);
239 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), "");
240 rdx_first_arg_addr = __ argument_address(rdx_argp, -1);
241 } else {
242 DEBUG_ONLY(rdx_argp = noreg);
243 }
244
245 if (!is_signature_polymorphic_static(iid)) {
246 __ movptr(rcx_mh, rdx_first_arg_addr);
247 DEBUG_ONLY(rdx_argp = noreg);
248 }
249
250 // rdx_first_arg_addr is live!
251
252 trace_method_handle_interpreter_entry(_masm, iid);
253
254 if (iid == vmIntrinsics::_invokeBasic) {
255 generate_method_handle_dispatch(_masm, iid, rcx_mh, noreg, not_for_compiler_entry);
256
257 } else {
258 // Adjust argument list by popping the trailing MemberName argument.
259 Register rcx_recv = noreg;
260 if (MethodHandles::ref_kind_has_receiver(ref_kind)) {
261 // Load the receiver (not the MH; the actual MemberName's receiver) up from the interpreter stack.
262 __ movptr(rcx_recv = rcx, rdx_first_arg_addr);
263 }
264 DEBUG_ONLY(rdx_argp = noreg);
265 Register rbx_member = rbx_method; // MemberName ptr; incoming method ptr is dead now
266 __ pop(rax_temp); // return address
267 __ pop(rbx_member); // extract last argument
268 __ push(rax_temp); // re-push return address
269 generate_method_handle_dispatch(_masm, iid, rcx_recv, rbx_member, not_for_compiler_entry);
270 }
271
272 return entry_point;
273 }
274
275 void MethodHandles::generate_method_handle_dispatch(MacroAssembler* _masm,
276 vmIntrinsics::ID iid,
277 Register receiver_reg,
278 Register member_reg,
279 bool for_compiler_entry) {
280 assert(is_signature_polymorphic(iid), "expected invoke iid");
281 Register rbx_method = rbx; // eventual target of this invocation
282 // temps used in this code are not used in *either* compiled or interpreted calling sequences
283 #ifdef _LP64
284 Register temp1 = rscratch1;
285 Register temp2 = rscratch2;
286 Register temp3 = rax;
287 if (for_compiler_entry) {
288 assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : j_rarg0), "only valid assignment");
289 assert_different_registers(temp1, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5);
290 assert_different_registers(temp2, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5);
291 assert_different_registers(temp3, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5);
292 }
293 #else
294 Register temp1 = (for_compiler_entry ? rsi : rdx);
295 Register temp2 = rdi;
296 Register temp3 = rax;
297 if (for_compiler_entry) {
298 assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : rcx), "only valid assignment");
299 assert_different_registers(temp1, rcx, rdx);
300 assert_different_registers(temp2, rcx, rdx);
301 assert_different_registers(temp3, rcx, rdx);
302 }
303 #endif
304 else {
305 assert_different_registers(temp1, temp2, temp3, saved_last_sp_register()); // don't trash lastSP
306 }
307 assert_different_registers(temp1, temp2, temp3, receiver_reg);
308 assert_different_registers(temp1, temp2, temp3, member_reg);
309
310 if (iid == vmIntrinsics::_invokeBasic) {
311 // indirect through MH.form.vmentry.vmtarget
312 jump_to_lambda_form(_masm, receiver_reg, rbx_method, temp1, for_compiler_entry);
313
314 } else {
315 // The method is a member invoker used by direct method handles.
316 if (VerifyMethodHandles) {
317 // make sure the trailing argument really is a MemberName (caller responsibility)
318 verify_klass(_masm, member_reg, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_invoke_MemberName),
319 "MemberName required for invokeVirtual etc.");
320 }
321
322 Address member_clazz( member_reg, NONZERO(java_lang_invoke_MemberName::clazz_offset_in_bytes()));
323 Address member_vmindex( member_reg, NONZERO(java_lang_invoke_MemberName::vmindex_offset_in_bytes()));
324 Address member_vmtarget( member_reg, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes()));
325
326 Register temp1_recv_klass = temp1;
327 if (iid != vmIntrinsics::_linkToStatic) {
328 __ verify_oop(receiver_reg);
329 if (iid == vmIntrinsics::_linkToSpecial) {
330 // Don't actually load the klass; just null-check the receiver.
331 __ null_check(receiver_reg);
332 } else {
333 // load receiver klass itself
334 __ null_check(receiver_reg, oopDesc::klass_offset_in_bytes());
335 __ load_klass(temp1_recv_klass, receiver_reg);
336 __ verify_klass_ptr(temp1_recv_klass);
337 }
338 BLOCK_COMMENT("check_receiver {");
339 // The receiver for the MemberName must be in receiver_reg.
340 // Check the receiver against the MemberName.clazz
341 if (VerifyMethodHandles && iid == vmIntrinsics::_linkToSpecial) {
342 // Did not load it above...
343 __ load_klass(temp1_recv_klass, receiver_reg);
344 __ verify_klass_ptr(temp1_recv_klass);
345 }
346 if (VerifyMethodHandles && iid != vmIntrinsics::_linkToInterface) {
347 Label L_ok;
348 Register temp2_defc = temp2;
349 __ load_heap_oop(temp2_defc, member_clazz);
350 load_klass_from_Class(_masm, temp2_defc);
351 __ verify_klass_ptr(temp2_defc);
352 __ check_klass_subtype(temp1_recv_klass, temp2_defc, temp3, L_ok);
353 // If we get here, the type check failed!
354 __ STOP("receiver class disagrees with MemberName.clazz");
355 __ bind(L_ok);
356 }
357 BLOCK_COMMENT("} check_receiver");
358 }
359 if (iid == vmIntrinsics::_linkToSpecial ||
360 iid == vmIntrinsics::_linkToStatic) {
361 DEBUG_ONLY(temp1_recv_klass = noreg); // these guys didn't load the recv_klass
362 }
363
364 // Live registers at this point:
365 // member_reg - MemberName that was the trailing argument
366 // temp1_recv_klass - klass of stacked receiver, if needed
367 // rsi/r13 - interpreter linkage (if interpreted)
368 // rcx, rdx, rsi, rdi, r8, r8 - compiler arguments (if compiled)
369
370 Label L_incompatible_class_change_error;
371 switch (iid) {
372 case vmIntrinsics::_linkToSpecial:
373 if (VerifyMethodHandles) {
374 verify_ref_kind(_masm, JVM_REF_invokeSpecial, member_reg, temp3);
375 }
376 __ movptr(rbx_method, member_vmtarget);
377 break;
378
379 case vmIntrinsics::_linkToStatic:
380 if (VerifyMethodHandles) {
381 verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp3);
382 }
383 __ movptr(rbx_method, member_vmtarget);
384 break;
385
386 case vmIntrinsics::_linkToVirtual:
387 {
388 // same as TemplateTable::invokevirtual,
389 // minus the CP setup and profiling:
390
391 if (VerifyMethodHandles) {
392 verify_ref_kind(_masm, JVM_REF_invokeVirtual, member_reg, temp3);
393 }
394
395 // pick out the vtable index from the MemberName, and then we can discard it:
396 Register temp2_index = temp2;
397 __ movptr(temp2_index, member_vmindex);
398
399 if (VerifyMethodHandles) {
400 Label L_index_ok;
401 __ cmpl(temp2_index, 0);
402 __ jcc(Assembler::greaterEqual, L_index_ok);
403 __ STOP("no virtual index");
404 __ BIND(L_index_ok);
405 }
406
407 // Note: The verifier invariants allow us to ignore MemberName.clazz and vmtarget
408 // at this point. And VerifyMethodHandles has already checked clazz, if needed.
409
410 // get target Method* & entry point
411 __ lookup_virtual_method(temp1_recv_klass, temp2_index, rbx_method);
412 break;
413 }
414
415 case vmIntrinsics::_linkToInterface:
416 {
417 // same as TemplateTable::invokeinterface
418 // (minus the CP setup and profiling, with different argument motion)
419 if (VerifyMethodHandles) {
420 verify_ref_kind(_masm, JVM_REF_invokeInterface, member_reg, temp3);
421 }
422
423 Register temp3_intf = temp3;
424 __ load_heap_oop(temp3_intf, member_clazz);
425 load_klass_from_Class(_masm, temp3_intf);
426 __ verify_klass_ptr(temp3_intf);
427
428 Register rbx_index = rbx_method;
429 __ movptr(rbx_index, member_vmindex);
430 if (VerifyMethodHandles) {
431 Label L;
432 __ cmpl(rbx_index, 0);
433 __ jcc(Assembler::greaterEqual, L);
434 __ STOP("invalid vtable index for MH.invokeInterface");
435 __ bind(L);
436 }
437
438 // given intf, index, and recv klass, dispatch to the implementation method
439 __ lookup_interface_method(temp1_recv_klass, temp3_intf,
440 // note: next two args must be the same:
441 rbx_index, rbx_method,
442 temp2,
443 L_incompatible_class_change_error);
444 break;
445 }
446
447 default:
448 fatal(err_msg_res("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid)));
449 break;
450 }
451
452 // Live at this point:
453 // rbx_method
454 // rsi/r13 (if interpreted)
455
456 // After figuring out which concrete method to call, jump into it.
457 // Note that this works in the interpreter with no data motion.
458 // But the compiled version will require that rcx_recv be shifted out.
459 __ verify_method_ptr(rbx_method);
460 jump_from_method_handle(_masm, rbx_method, temp1, for_compiler_entry);
461
462 if (iid == vmIntrinsics::_linkToInterface) {
463 __ bind(L_incompatible_class_change_error);
464 __ jump(RuntimeAddress(StubRoutines::throw_IncompatibleClassChangeError_entry()));
465 }
466 }
467 }
468
469 #ifndef PRODUCT
470 void trace_method_handle_stub(const char* adaptername,
471 oop mh,
472 intptr_t* saved_regs,
473 intptr_t* entry_sp) {
474 // called as a leaf from native code: do not block the JVM!
475 bool has_mh = (strstr(adaptername, "/static") == NULL &&
476 strstr(adaptername, "linkTo") == NULL); // static linkers don't have MH
477 const char* mh_reg_name = has_mh ? "rcx_mh" : "rcx";
478 tty->print_cr("MH %s %s="PTR_FORMAT" sp="PTR_FORMAT,
479 adaptername, mh_reg_name,
480 mh, entry_sp);
481
482 if (Verbose) {
483 tty->print_cr("Registers:");
484 const int saved_regs_count = RegisterImpl::number_of_registers;
485 for (int i = 0; i < saved_regs_count; i++) {
486 Register r = as_Register(i);
487 // The registers are stored in reverse order on the stack (by pusha).
488 tty->print("%3s=" PTR_FORMAT, r->name(), saved_regs[((saved_regs_count - 1) - i)]);
489 if ((i + 1) % 4 == 0) {
490 tty->cr();
491 } else {
492 tty->print(", ");
493 }
494 }
495 tty->cr();
496
497 {
498 // dumping last frame with frame::describe
499
500 JavaThread* p = JavaThread::active();
501
502 ResourceMark rm;
503 PRESERVE_EXCEPTION_MARK; // may not be needed by safer and unexpensive here
504 FrameValues values;
505
506 // Note: We want to allow trace_method_handle from any call site.
507 // While trace_method_handle creates a frame, it may be entered
508 // without a PC on the stack top (e.g. not just after a call).
509 // Walking that frame could lead to failures due to that invalid PC.
510 // => carefully detect that frame when doing the stack walking
511
512 // Current C frame
513 frame cur_frame = os::current_frame();
514
515 // Robust search of trace_calling_frame (independant of inlining).
516 // Assumes saved_regs comes from a pusha in the trace_calling_frame.
517 assert(cur_frame.sp() < saved_regs, "registers not saved on stack ?");
518 frame trace_calling_frame = os::get_sender_for_C_frame(&cur_frame);
519 while (trace_calling_frame.fp() < saved_regs) {
520 trace_calling_frame = os::get_sender_for_C_frame(&trace_calling_frame);
521 }
522
523 // safely create a frame and call frame::describe
524 intptr_t *dump_sp = trace_calling_frame.sender_sp();
525 intptr_t *dump_fp = trace_calling_frame.link();
526
527 bool walkable = has_mh; // whether the traced frame shoud be walkable
528
529 if (walkable) {
530 // The previous definition of walkable may have to be refined
531 // if new call sites cause the next frame constructor to start
532 // failing. Alternatively, frame constructors could be
533 // modified to support the current or future non walkable
534 // frames (but this is more intrusive and is not considered as
535 // part of this RFE, which will instead use a simpler output).
536 frame dump_frame = frame(dump_sp, dump_fp);
537 dump_frame.describe(values, 1);
538 } else {
539 // Stack may not be walkable (invalid PC above FP):
540 // Add descriptions without building a Java frame to avoid issues
541 values.describe(-1, dump_fp, "fp for #1 <not parsed, cannot trust pc>");
542 values.describe(-1, dump_sp, "sp for #1");
543 }
544 values.describe(-1, entry_sp, "raw top of stack");
545
546 tty->print_cr("Stack layout:");
547 values.print(p);
548 }
549 if (has_mh && mh->is_oop()) {
550 mh->print();
551 if (java_lang_invoke_MethodHandle::is_instance(mh)) {
552 if (java_lang_invoke_MethodHandle::form_offset_in_bytes() != 0)
553 java_lang_invoke_MethodHandle::form(mh)->print();
554 }
555 }
556 }
557 }
558
559 // The stub wraps the arguments in a struct on the stack to avoid
560 // dealing with the different calling conventions for passing 6
561 // arguments.
562 struct MethodHandleStubArguments {
563 const char* adaptername;
564 oopDesc* mh;
565 intptr_t* saved_regs;
566 intptr_t* entry_sp;
567 };
568 void trace_method_handle_stub_wrapper(MethodHandleStubArguments* args) {
569 trace_method_handle_stub(args->adaptername,
570 args->mh,
571 args->saved_regs,
572 args->entry_sp);
573 }
574
575 void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) {
576 if (!TraceMethodHandles) return;
577 BLOCK_COMMENT("trace_method_handle {");
578 __ enter();
579 __ andptr(rsp, -16); // align stack if needed for FPU state
580 __ pusha();
581 __ mov(rbx, rsp); // for retreiving saved_regs
582 // Note: saved_regs must be in the entered frame for the
583 // robust stack walking implemented in trace_method_handle_stub.
584
585 // save FP result, valid at some call sites (adapter_opt_return_float, ...)
586 __ increment(rsp, -2 * wordSize);
587 if (UseSSE >= 2) {
588 __ movdbl(Address(rsp, 0), xmm0);
589 } else if (UseSSE == 1) {
590 __ movflt(Address(rsp, 0), xmm0);
591 } else {
592 __ fst_d(Address(rsp, 0));
593 }
594
595 // Incoming state:
596 // rcx: method handle
597 //
598 // To avoid calling convention issues, build a record on the stack
599 // and pass the pointer to that instead.
600 __ push(rbp); // entry_sp (with extra align space)
601 __ push(rbx); // pusha saved_regs
602 __ push(rcx); // mh
603 __ push(rcx); // slot for adaptername
604 __ movptr(Address(rsp, 0), (intptr_t) adaptername);
605 __ super_call_VM_leaf(CAST_FROM_FN_PTR(address, trace_method_handle_stub_wrapper), rsp);
606 __ increment(rsp, sizeof(MethodHandleStubArguments));
607
608 if (UseSSE >= 2) {
609 __ movdbl(xmm0, Address(rsp, 0));
610 } else if (UseSSE == 1) {
611 __ movflt(xmm0, Address(rsp, 0));
612 } else {
613 __ fld_d(Address(rsp, 0));
614 }
615 __ increment(rsp, 2 * wordSize);
616
617 __ popa();
618 __ leave();
619 BLOCK_COMMENT("} trace_method_handle");
620 }
621 #endif //PRODUCT