1 /*
2 * Copyright (c) 1997, 2017, 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 "asm/macroAssembler.hpp"
27 #include "classfile/javaClasses.inline.hpp"
28 #include "interpreter/interpreter.hpp"
29 #include "interpreter/interpreterRuntime.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 #define STOP(error) stop(error)
40 #else
41 #define BLOCK_COMMENT(str) __ block_comment(str)
42 #define STOP(error) block_comment(error); __ stop(error)
43 #endif
44
45 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":")
46
47 void MethodHandles::load_klass_from_Class(MacroAssembler* _masm, Register klass_reg) {
48 if (VerifyMethodHandles)
49 verify_klass(_masm, klass_reg, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_Class),
50 "MH argument is a Class");
51 __ movptr(klass_reg, Address(klass_reg, java_lang_Class::klass_offset_in_bytes()));
52 }
53
54 #ifdef ASSERT
55 static int check_nonzero(const char* xname, int x) {
56 assert(x != 0, "%s should be nonzero", xname);
57 return x;
58 }
59 #define NONZERO(x) check_nonzero(#x, x)
60 #else //ASSERT
61 #define NONZERO(x) (x)
62 #endif //ASSERT
63
64 #ifdef ASSERT
65 void MethodHandles::verify_klass(MacroAssembler* _masm,
66 Register obj, SystemDictionary::WKID klass_id,
67 const char* error_message) {
68 InstanceKlass** klass_addr = SystemDictionary::well_known_klass_addr(klass_id);
69 Klass* klass = SystemDictionary::well_known_klass(klass_id);
70 Register temp = rdi;
71 Register temp2 = noreg;
72 LP64_ONLY(temp2 = rscratch1); // used by MacroAssembler::cmpptr
73 Label L_ok, L_bad;
74 BLOCK_COMMENT("verify_klass {");
75 __ verify_oop(obj);
76 __ testptr(obj, obj);
77 __ jcc(Assembler::zero, L_bad);
78 __ push(temp); if (temp2 != noreg) __ push(temp2);
79 #define UNPUSH { if (temp2 != noreg) __ pop(temp2); __ pop(temp); }
80 __ load_klass(temp, obj);
81 __ cmpptr(temp, ExternalAddress((address) klass_addr));
82 __ jcc(Assembler::equal, L_ok);
83 intptr_t super_check_offset = klass->super_check_offset();
84 __ movptr(temp, Address(temp, super_check_offset));
85 __ cmpptr(temp, ExternalAddress((address) klass_addr));
86 __ jcc(Assembler::equal, L_ok);
87 UNPUSH;
88 __ bind(L_bad);
89 __ STOP(error_message);
90 __ BIND(L_ok);
91 UNPUSH;
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 __ movl(temp, Address(member_reg, NONZERO(java_lang_invoke_MemberName::flags_offset_in_bytes())));
99 __ shrl(temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT);
100 __ andl(temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK);
101 __ cmpl(temp, ref_kind);
102 __ jcc(Assembler::equal, L);
103 { char* buf = NEW_C_HEAP_ARRAY(char, 100, mtInternal);
104 jio_snprintf(buf, 100, "verify_ref_kind expected %x", ref_kind);
105 if (ref_kind == JVM_REF_invokeVirtual ||
106 ref_kind == JVM_REF_invokeSpecial)
107 // could do this for all ref_kinds, but would explode assembly code size
108 trace_method_handle(_masm, buf);
109 __ STOP(buf);
110 }
111 BLOCK_COMMENT("} verify_ref_kind");
112 __ bind(L);
113 }
114
115 #endif //ASSERT
116
117 void MethodHandles::jump_from_method_handle(MacroAssembler* _masm, Register method, Register temp,
118 bool for_compiler_entry) {
119 assert(method == rbx, "interpreter calling convention");
120
121 Label L_no_such_method;
122 __ testptr(rbx, rbx);
123 __ jcc(Assembler::zero, L_no_such_method);
124
125 __ verify_method_ptr(method);
126
127 if (!for_compiler_entry && JvmtiExport::can_post_interpreter_events()) {
128 Label run_compiled_code;
129 // JVMTI events, such as single-stepping, are implemented partly by avoiding running
130 // compiled code in threads for which the event is enabled. Check here for
131 // interp_only_mode if these events CAN be enabled.
132 #ifdef _LP64
133 Register rthread = r15_thread;
134 #else
135 Register rthread = temp;
136 __ get_thread(rthread);
137 #endif
138 // interp_only is an int, on little endian it is sufficient to test the byte only
139 // Is a cmpl faster?
140 __ cmpb(Address(rthread, JavaThread::interp_only_mode_offset()), 0);
141 __ jccb(Assembler::zero, run_compiled_code);
142 __ jmp(Address(method, Method::interpreter_entry_offset()));
143 __ BIND(run_compiled_code);
144 }
145
146 const ByteSize entry_offset = for_compiler_entry ? Method::from_compiled_offset() :
147 Method::from_interpreted_offset();
148 __ jmp(Address(method, entry_offset));
149
150 __ bind(L_no_such_method);
151 __ jump(RuntimeAddress(StubRoutines::throw_AbstractMethodError_entry()));
152 }
153
154 void MethodHandles::jump_to_lambda_form(MacroAssembler* _masm,
155 Register recv, Register method_temp,
156 Register temp2,
157 bool for_compiler_entry) {
158 BLOCK_COMMENT("jump_to_lambda_form {");
159 // This is the initial entry point of a lazy method handle.
160 // After type checking, it picks up the invoker from the LambdaForm.
161 assert_different_registers(recv, method_temp, temp2);
162 assert(recv != noreg, "required register");
163 assert(method_temp == rbx, "required register for loading method");
164
165 //NOT_PRODUCT({ FlagSetting fs(TraceMethodHandles, true); trace_method_handle(_masm, "LZMH"); });
166
167 // Load the invoker, as MH -> MH.form -> LF.vmentry
168 __ verify_oop(recv);
169 __ load_heap_oop(method_temp, Address(recv, NONZERO(java_lang_invoke_MethodHandle::form_offset_in_bytes())));
170 __ verify_oop(method_temp);
171 __ load_heap_oop(method_temp, Address(method_temp, NONZERO(java_lang_invoke_LambdaForm::vmentry_offset_in_bytes())));
172 __ verify_oop(method_temp);
173 __ load_heap_oop(method_temp, Address(method_temp, NONZERO(java_lang_invoke_MemberName::method_offset_in_bytes())));
174 __ verify_oop(method_temp);
175 __ movptr(method_temp, Address(method_temp, NONZERO(java_lang_invoke_ResolvedMethodName::vmtarget_offset_in_bytes())));
176
177 if (VerifyMethodHandles && !for_compiler_entry) {
178 // make sure recv is already on stack
179 __ movptr(temp2, Address(method_temp, Method::const_offset()));
180 __ load_sized_value(temp2,
181 Address(temp2, ConstMethod::size_of_parameters_offset()),
182 sizeof(u2), /*is_signed*/ false);
183 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), "");
184 Label L;
185 __ cmpoop(recv, __ argument_address(temp2, -1));
186 __ jcc(Assembler::equal, L);
187 __ movptr(rax, __ argument_address(temp2, -1));
188 __ STOP("receiver not on stack");
189 __ BIND(L);
190 }
191
192 jump_from_method_handle(_masm, method_temp, temp2, for_compiler_entry);
193 BLOCK_COMMENT("} jump_to_lambda_form");
194 }
195
196
197 // Code generation
198 address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* _masm,
199 vmIntrinsics::ID iid) {
200 const bool not_for_compiler_entry = false; // this is the interpreter entry
201 assert(is_signature_polymorphic(iid), "expected invoke iid");
202 if (iid == vmIntrinsics::_invokeGeneric ||
203 iid == vmIntrinsics::_compiledLambdaForm) {
204 // Perhaps surprisingly, the symbolic references visible to Java are not directly used.
205 // They are linked to Java-generated adapters via MethodHandleNatives.linkMethod.
206 // They all allow an appendix argument.
207 __ hlt(); // empty stubs make SG sick
208 return NULL;
209 }
210
211 // rsi/r13: sender SP (must preserve; see prepare_to_jump_from_interpreted)
212 // rbx: Method*
213 // rdx: argument locator (parameter slot count, added to rsp)
214 // rcx: used as temp to hold mh or receiver
215 // rax, rdi: garbage temps, blown away
216 Register rdx_argp = rdx; // argument list ptr, live on error paths
217 Register rax_temp = rax;
218 Register rcx_mh = rcx; // MH receiver; dies quickly and is recycled
219 Register rbx_method = rbx; // eventual target of this invocation
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 __ cmpw(Address(rbx_method, Method::intrinsic_id_offset_in_bytes()), (int) iid);
231 __ jcc(Assembler::equal, L);
232 if (iid == vmIntrinsics::_linkToVirtual ||
233 iid == vmIntrinsics::_linkToSpecial) {
234 // could do this for all kinds, but would explode assembly code size
235 trace_method_handle(_masm, "bad Method*::intrinsic_id");
236 }
237 __ STOP("bad Method*::intrinsic_id");
238 __ bind(L);
239 BLOCK_COMMENT("} verify_intrinsic_id");
240 }
241
242 // First task: Find out how big the argument list is.
243 Address rdx_first_arg_addr;
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 __ movptr(rdx_argp, Address(rbx_method, Method::const_offset()));
248 __ load_sized_value(rdx_argp,
249 Address(rdx_argp, ConstMethod::size_of_parameters_offset()),
250 sizeof(u2), /*is_signed*/ false);
251 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), "");
252 rdx_first_arg_addr = __ argument_address(rdx_argp, -1);
253 } else {
254 DEBUG_ONLY(rdx_argp = noreg);
255 }
256
257 if (!is_signature_polymorphic_static(iid)) {
258 __ movptr(rcx_mh, rdx_first_arg_addr);
259 DEBUG_ONLY(rdx_argp = noreg);
260 }
261
262 // rdx_first_arg_addr is live!
263
264 trace_method_handle_interpreter_entry(_masm, iid);
265
266 if (iid == vmIntrinsics::_invokeBasic) {
267 generate_method_handle_dispatch(_masm, iid, rcx_mh, noreg, not_for_compiler_entry);
268
269 } else {
270 // Adjust argument list by popping the trailing MemberName argument.
271 Register rcx_recv = noreg;
272 if (MethodHandles::ref_kind_has_receiver(ref_kind)) {
273 // Load the receiver (not the MH; the actual MemberName's receiver) up from the interpreter stack.
274 __ movptr(rcx_recv = rcx, rdx_first_arg_addr);
275 }
276 DEBUG_ONLY(rdx_argp = noreg);
277 Register rbx_member = rbx_method; // MemberName ptr; incoming method ptr is dead now
278 __ pop(rax_temp); // return address
279 __ pop(rbx_member); // extract last argument
280 __ push(rax_temp); // re-push return address
281 generate_method_handle_dispatch(_masm, iid, rcx_recv, rbx_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 rbx_method = rbx; // eventual target of this invocation
294 // temps used in this code are not used in *either* compiled or interpreted calling sequences
295 #ifdef _LP64
296 Register temp1 = rscratch1;
297 Register temp2 = rscratch2;
298 Register temp3 = rax;
299 if (for_compiler_entry) {
300 assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : j_rarg0), "only valid assignment");
301 assert_different_registers(temp1, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5);
302 assert_different_registers(temp2, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5);
303 assert_different_registers(temp3, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5);
304 }
305 #else
306 Register temp1 = (for_compiler_entry ? rsi : rdx);
307 Register temp2 = rdi;
308 Register temp3 = rax;
309 if (for_compiler_entry) {
310 assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : rcx), "only valid assignment");
311 assert_different_registers(temp1, rcx, rdx);
312 assert_different_registers(temp2, rcx, rdx);
313 assert_different_registers(temp3, rcx, rdx);
314 }
315 #endif
316 else {
317 assert_different_registers(temp1, temp2, temp3, saved_last_sp_register()); // don't trash lastSP
318 }
319 assert_different_registers(temp1, temp2, temp3, receiver_reg);
320 assert_different_registers(temp1, temp2, temp3, member_reg);
321
322 if (iid == vmIntrinsics::_invokeBasic) {
323 // indirect through MH.form.vmentry.vmtarget
324 jump_to_lambda_form(_masm, receiver_reg, rbx_method, temp1, for_compiler_entry);
325
326 } else {
327 // The method is a member invoker used by direct method handles.
328 if (VerifyMethodHandles) {
329 // make sure the trailing argument really is a MemberName (caller responsibility)
330 verify_klass(_masm, member_reg, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_invoke_MemberName),
331 "MemberName required for invokeVirtual etc.");
332 }
333
334 Address member_clazz( member_reg, NONZERO(java_lang_invoke_MemberName::clazz_offset_in_bytes()));
335 Address member_vmindex( member_reg, NONZERO(java_lang_invoke_MemberName::vmindex_offset_in_bytes()));
336 Address member_vmtarget( member_reg, NONZERO(java_lang_invoke_MemberName::method_offset_in_bytes()));
337 Address vmtarget_method( rbx_method, NONZERO(java_lang_invoke_ResolvedMethodName::vmtarget_offset_in_bytes()));
338
339 Register temp1_recv_klass = temp1;
340 if (iid != vmIntrinsics::_linkToStatic) {
341 __ verify_oop(receiver_reg);
342 if (iid == vmIntrinsics::_linkToSpecial) {
343 // Don't actually load the klass; just null-check the receiver.
344 __ null_check(receiver_reg);
345 } else {
346 // load receiver klass itself
347 __ null_check(receiver_reg, oopDesc::klass_offset_in_bytes());
348 __ load_klass(temp1_recv_klass, receiver_reg);
349 __ verify_klass_ptr(temp1_recv_klass);
350 }
351 BLOCK_COMMENT("check_receiver {");
352 // The receiver for the MemberName must be in receiver_reg.
353 // Check the receiver against the MemberName.clazz
354 if (VerifyMethodHandles && iid == vmIntrinsics::_linkToSpecial) {
355 // Did not load it above...
356 __ load_klass(temp1_recv_klass, receiver_reg);
357 __ verify_klass_ptr(temp1_recv_klass);
358 }
359 if (VerifyMethodHandles && iid != vmIntrinsics::_linkToInterface) {
360 Label L_ok;
361 Register temp2_defc = temp2;
362 __ load_heap_oop(temp2_defc, member_clazz);
363 load_klass_from_Class(_masm, temp2_defc);
364 __ verify_klass_ptr(temp2_defc);
365 __ check_klass_subtype(temp1_recv_klass, temp2_defc, temp3, L_ok);
366 // If we get here, the type check failed!
367 __ STOP("receiver class disagrees with MemberName.clazz");
368 __ bind(L_ok);
369 }
370 BLOCK_COMMENT("} check_receiver");
371 }
372 if (iid == vmIntrinsics::_linkToSpecial ||
373 iid == vmIntrinsics::_linkToStatic) {
374 DEBUG_ONLY(temp1_recv_klass = noreg); // these guys didn't load the recv_klass
375 }
376
377 // Live registers at this point:
378 // member_reg - MemberName that was the trailing argument
379 // temp1_recv_klass - klass of stacked receiver, if needed
380 // rsi/r13 - interpreter linkage (if interpreted)
381 // rcx, rdx, rsi, rdi, r8 - compiler arguments (if compiled)
382
383 Label L_incompatible_class_change_error;
384 switch (iid) {
385 case vmIntrinsics::_linkToSpecial:
386 if (VerifyMethodHandles) {
387 verify_ref_kind(_masm, JVM_REF_invokeSpecial, member_reg, temp3);
388 }
389 __ load_heap_oop(rbx_method, member_vmtarget);
390 __ movptr(rbx_method, vmtarget_method);
391 break;
392
393 case vmIntrinsics::_linkToStatic:
394 if (VerifyMethodHandles) {
395 verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp3);
396 }
397 __ load_heap_oop(rbx_method, member_vmtarget);
398 __ movptr(rbx_method, vmtarget_method);
399 break;
400
401 case vmIntrinsics::_linkToVirtual:
402 {
403 // same as TemplateTable::invokevirtual,
404 // minus the CP setup and profiling:
405
406 if (VerifyMethodHandles) {
407 verify_ref_kind(_masm, JVM_REF_invokeVirtual, member_reg, temp3);
408 }
409
410 // pick out the vtable index from the MemberName, and then we can discard it:
411 Register temp2_index = temp2;
412 __ movptr(temp2_index, member_vmindex);
413
414 if (VerifyMethodHandles) {
415 Label L_index_ok;
416 __ cmpl(temp2_index, 0);
417 __ jcc(Assembler::greaterEqual, L_index_ok);
418 __ STOP("no virtual index");
419 __ BIND(L_index_ok);
420 }
421
422 // Note: The verifier invariants allow us to ignore MemberName.clazz and vmtarget
423 // at this point. And VerifyMethodHandles has already checked clazz, if needed.
424
425 // get target Method* & entry point
426 __ lookup_virtual_method(temp1_recv_klass, temp2_index, rbx_method);
427 break;
428 }
429
430 case vmIntrinsics::_linkToInterface:
431 {
432 // same as TemplateTable::invokeinterface
433 // (minus the CP setup and profiling, with different argument motion)
434 if (VerifyMethodHandles) {
435 verify_ref_kind(_masm, JVM_REF_invokeInterface, member_reg, temp3);
436 }
437
438 Register temp3_intf = temp3;
439 __ load_heap_oop(temp3_intf, member_clazz);
440 load_klass_from_Class(_masm, temp3_intf);
441 __ verify_klass_ptr(temp3_intf);
442
443 Register rbx_index = rbx_method;
444 __ movptr(rbx_index, member_vmindex);
445 if (VerifyMethodHandles) {
446 Label L;
447 __ cmpl(rbx_index, 0);
448 __ jcc(Assembler::greaterEqual, L);
449 __ STOP("invalid vtable index for MH.invokeInterface");
450 __ bind(L);
451 }
452
453 // given intf, index, and recv klass, dispatch to the implementation method
454 __ lookup_interface_method(temp1_recv_klass, temp3_intf,
455 // note: next two args must be the same:
456 rbx_index, rbx_method,
457 temp2,
458 L_incompatible_class_change_error);
459 break;
460 }
461
462 default:
463 fatal("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid));
464 break;
465 }
466
467 // Live at this point:
468 // rbx_method
469 // rsi/r13 (if interpreted)
470
471 // After figuring out which concrete method to call, jump into it.
472 // Note that this works in the interpreter with no data motion.
473 // But the compiled version will require that rcx_recv be shifted out.
474 __ verify_method_ptr(rbx_method);
475 jump_from_method_handle(_masm, rbx_method, temp1, for_compiler_entry);
476
477 if (iid == vmIntrinsics::_linkToInterface) {
478 __ bind(L_incompatible_class_change_error);
479 __ jump(RuntimeAddress(StubRoutines::throw_IncompatibleClassChangeError_entry()));
480 }
481 }
482 }
483
484 #ifndef PRODUCT
485 void trace_method_handle_stub(const char* adaptername,
486 oop mh,
487 intptr_t* saved_regs,
488 intptr_t* entry_sp) {
489 // called as a leaf from native code: do not block the JVM!
490 bool has_mh = (strstr(adaptername, "/static") == NULL &&
491 strstr(adaptername, "linkTo") == NULL); // static linkers don't have MH
492 const char* mh_reg_name = has_mh ? "rcx_mh" : "rcx";
493 tty->print_cr("MH %s %s=" PTR_FORMAT " sp=" PTR_FORMAT,
494 adaptername, mh_reg_name,
495 p2i(mh), p2i(entry_sp));
496
497 if (Verbose) {
498 tty->print_cr("Registers:");
499 const int saved_regs_count = RegisterImpl::number_of_registers;
500 for (int i = 0; i < saved_regs_count; i++) {
501 Register r = as_Register(i);
502 // The registers are stored in reverse order on the stack (by pusha).
503 tty->print("%3s=" PTR_FORMAT, r->name(), saved_regs[((saved_regs_count - 1) - i)]);
504 if ((i + 1) % 4 == 0) {
505 tty->cr();
506 } else {
507 tty->print(", ");
508 }
509 }
510 tty->cr();
511
512 {
513 // dumping last frame with frame::describe
514
515 JavaThread* p = JavaThread::active();
516
517 ResourceMark rm;
518 PRESERVE_EXCEPTION_MARK; // may not be needed by safer and unexpensive here
519 FrameValues values;
520
521 // Note: We want to allow trace_method_handle from any call site.
522 // While trace_method_handle creates a frame, it may be entered
523 // without a PC on the stack top (e.g. not just after a call).
524 // Walking that frame could lead to failures due to that invalid PC.
525 // => carefully detect that frame when doing the stack walking
526
527 // Current C frame
528 frame cur_frame = os::current_frame();
529
530 // Robust search of trace_calling_frame (independant of inlining).
531 // Assumes saved_regs comes from a pusha in the trace_calling_frame.
532 assert(cur_frame.sp() < saved_regs, "registers not saved on stack ?");
533 frame trace_calling_frame = os::get_sender_for_C_frame(&cur_frame);
534 while (trace_calling_frame.fp() < saved_regs) {
535 trace_calling_frame = os::get_sender_for_C_frame(&trace_calling_frame);
536 }
537
538 // safely create a frame and call frame::describe
539 intptr_t *dump_sp = trace_calling_frame.sender_sp();
540 intptr_t *dump_fp = trace_calling_frame.link();
541
542 bool walkable = has_mh; // whether the traced frame shoud be walkable
543
544 if (walkable) {
545 // The previous definition of walkable may have to be refined
546 // if new call sites cause the next frame constructor to start
547 // failing. Alternatively, frame constructors could be
548 // modified to support the current or future non walkable
549 // frames (but this is more intrusive and is not considered as
550 // part of this RFE, which will instead use a simpler output).
551 frame dump_frame = frame(dump_sp, dump_fp);
552 dump_frame.describe(values, 1);
553 } else {
554 // Stack may not be walkable (invalid PC above FP):
555 // Add descriptions without building a Java frame to avoid issues
556 values.describe(-1, dump_fp, "fp for #1 <not parsed, cannot trust pc>");
557 values.describe(-1, dump_sp, "sp for #1");
558 }
559 values.describe(-1, entry_sp, "raw top of stack");
560
561 tty->print_cr("Stack layout:");
562 values.print(p);
563 }
564 if (has_mh && oopDesc::is_oop(mh)) {
565 mh->print();
566 if (java_lang_invoke_MethodHandle::is_instance(mh)) {
567 if (java_lang_invoke_MethodHandle::form_offset_in_bytes() != 0)
568 java_lang_invoke_MethodHandle::form(mh)->print();
569 }
570 }
571 }
572 }
573
574 // The stub wraps the arguments in a struct on the stack to avoid
575 // dealing with the different calling conventions for passing 6
576 // arguments.
577 struct MethodHandleStubArguments {
578 const char* adaptername;
579 oopDesc* mh;
580 intptr_t* saved_regs;
581 intptr_t* entry_sp;
582 };
583 void trace_method_handle_stub_wrapper(MethodHandleStubArguments* args) {
584 trace_method_handle_stub(args->adaptername,
585 args->mh,
586 args->saved_regs,
587 args->entry_sp);
588 }
589
590 void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) {
591 if (!TraceMethodHandles) return;
592 BLOCK_COMMENT("trace_method_handle {");
593 __ enter();
594 __ andptr(rsp, -16); // align stack if needed for FPU state
595 __ pusha();
596 __ mov(rbx, rsp); // for retreiving saved_regs
597 // Note: saved_regs must be in the entered frame for the
598 // robust stack walking implemented in trace_method_handle_stub.
599
600 // save FP result, valid at some call sites (adapter_opt_return_float, ...)
601 __ increment(rsp, -2 * wordSize);
602 if (UseSSE >= 2) {
603 __ movdbl(Address(rsp, 0), xmm0);
604 } else if (UseSSE == 1) {
605 __ movflt(Address(rsp, 0), xmm0);
606 } else {
607 __ fst_d(Address(rsp, 0));
608 }
609
610 // Incoming state:
611 // rcx: method handle
612 //
613 // To avoid calling convention issues, build a record on the stack
614 // and pass the pointer to that instead.
615 __ push(rbp); // entry_sp (with extra align space)
616 __ push(rbx); // pusha saved_regs
617 __ push(rcx); // mh
618 __ push(rcx); // slot for adaptername
619 __ movptr(Address(rsp, 0), (intptr_t) adaptername);
620 __ super_call_VM_leaf(CAST_FROM_FN_PTR(address, trace_method_handle_stub_wrapper), rsp);
621 __ increment(rsp, sizeof(MethodHandleStubArguments));
622
623 if (UseSSE >= 2) {
624 __ movdbl(xmm0, Address(rsp, 0));
625 } else if (UseSSE == 1) {
626 __ movflt(xmm0, Address(rsp, 0));
627 } else {
628 __ fld_d(Address(rsp, 0));
629 }
630 __ increment(rsp, 2 * wordSize);
631
632 __ popa();
633 __ leave();
634 BLOCK_COMMENT("} trace_method_handle");
635 }
636 #endif //PRODUCT