1 /*
2 * Copyright (c) 1997, 2013, 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 "interpreter/interpreter.hpp"
28 #include "interpreter/interpreterRuntime.hpp"
29 #include "memory/allocation.inline.hpp"
30 #include "prims/methodHandles.hpp"
31
32 #define __ _masm->
33
34 #ifdef PRODUCT
35 #define BLOCK_COMMENT(str) /* nothing */
36 #define STOP(error) stop(error)
37 #else
38 #define BLOCK_COMMENT(str) __ block_comment(str)
39 #define STOP(error) block_comment(error); __ stop(error)
40 #endif
41
42 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":")
43
44 void MethodHandles::load_klass_from_Class(MacroAssembler* _masm, Register klass_reg) {
45 if (VerifyMethodHandles)
46 verify_klass(_masm, klass_reg, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_Class),
47 "MH argument is a Class");
48 __ movptr(klass_reg, Address(klass_reg, java_lang_Class::klass_offset_in_bytes()));
49 }
50
51 #ifdef ASSERT
52 static int check_nonzero(const char* xname, int x) {
53 assert(x != 0, err_msg("%s should be nonzero", xname));
54 return x;
55 }
56 #define NONZERO(x) check_nonzero(#x, x)
57 #else //ASSERT
58 #define NONZERO(x) (x)
59 #endif //ASSERT
60
61 #ifdef ASSERT
62 void MethodHandles::verify_klass(MacroAssembler* _masm,
63 Register obj, SystemDictionary::WKID klass_id,
64 const char* error_message) {
65 Klass** klass_addr = SystemDictionary::well_known_klass_addr(klass_id);
66 KlassHandle klass = SystemDictionary::well_known_klass(klass_id);
67 Register temp = rdi;
68 Register temp2 = noreg;
69 LP64_ONLY(temp2 = rscratch1); // used by MacroAssembler::cmpptr
70 Label L_ok, L_bad;
71 BLOCK_COMMENT("verify_klass {");
72 __ verify_oop(obj);
73 __ testptr(obj, obj);
74 __ jcc(Assembler::zero, L_bad);
75 __ push(temp); if (temp2 != noreg) __ push(temp2);
76 #define UNPUSH { if (temp2 != noreg) __ pop(temp2); __ pop(temp); }
77 __ load_klass(temp, obj);
78 __ cmpptr(temp, ExternalAddress((address) klass_addr));
79 __ jcc(Assembler::equal, L_ok);
80 intptr_t super_check_offset = klass->super_check_offset();
81 __ movptr(temp, Address(temp, super_check_offset));
82 __ cmpptr(temp, ExternalAddress((address) klass_addr));
83 __ jcc(Assembler::equal, L_ok);
84 UNPUSH;
85 __ bind(L_bad);
86 __ STOP(error_message);
87 __ BIND(L_ok);
88 UNPUSH;
89 BLOCK_COMMENT("} verify_klass");
90 }
91
92 void MethodHandles::verify_ref_kind(MacroAssembler* _masm, int ref_kind, Register member_reg, Register temp) {
93 Label L;
94 BLOCK_COMMENT("verify_ref_kind {");
95 __ movl(temp, Address(member_reg, NONZERO(java_lang_invoke_MemberName::flags_offset_in_bytes())));
96 __ shrl(temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT);
97 __ andl(temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK);
98 __ cmpl(temp, ref_kind);
99 __ jcc(Assembler::equal, L);
100 { char* buf = NEW_C_HEAP_ARRAY(char, 100, mtInternal);
101 jio_snprintf(buf, 100, "verify_ref_kind expected %x", ref_kind);
102 if (ref_kind == JVM_REF_invokeVirtual ||
103 ref_kind == JVM_REF_invokeSpecial)
104 // could do this for all ref_kinds, but would explode assembly code size
105 trace_method_handle(_masm, buf);
106 __ STOP(buf);
107 }
108 BLOCK_COMMENT("} verify_ref_kind");
109 __ bind(L);
110 }
111
112 #endif //ASSERT
113
114 void MethodHandles::jump_from_method_handle(MacroAssembler* _masm, Register method, Register temp,
115 bool for_compiler_entry) {
116 assert(method == rbx, "interpreter calling convention");
117
118 Label L_no_such_method;
119 __ testptr(rbx, rbx);
120 __ jcc(Assembler::zero, L_no_such_method);
121
122 __ verify_method_ptr(method);
123
124 if (!for_compiler_entry && JvmtiExport::can_post_interpreter_events()) {
125 Label run_compiled_code;
126 // JVMTI events, such as single-stepping, are implemented partly by avoiding running
127 // compiled code in threads for which the event is enabled. Check here for
128 // interp_only_mode if these events CAN be enabled.
129 #ifdef _LP64
130 Register rthread = r15_thread;
131 #else
132 Register rthread = temp;
133 __ get_thread(rthread);
134 #endif
135 // interp_only is an int, on little endian it is sufficient to test the byte only
136 // Is a cmpl faster?
137 __ cmpb(Address(rthread, JavaThread::interp_only_mode_offset()), 0);
138 __ jccb(Assembler::zero, run_compiled_code);
139 __ jmp(Address(method, Method::interpreter_entry_offset()));
140 __ BIND(run_compiled_code);
141 }
142
143 const ByteSize entry_offset = for_compiler_entry ? Method::from_compiled_offset() :
144 Method::from_interpreted_offset();
145 __ jmp(Address(method, entry_offset));
146
147 __ bind(L_no_such_method);
148 __ jump(RuntimeAddress(StubRoutines::throw_AbstractMethodError_entry()));
149 }
150
151 void MethodHandles::jump_to_lambda_form(MacroAssembler* _masm,
152 Register recv, Register method_temp,
153 Register temp2,
154 bool for_compiler_entry) {
155 BLOCK_COMMENT("jump_to_lambda_form {");
156 // This is the initial entry point of a lazy method handle.
157 // After type checking, it picks up the invoker from the LambdaForm.
158 assert_different_registers(recv, method_temp, temp2);
159 assert(recv != noreg, "required register");
160 assert(method_temp == rbx, "required register for loading method");
161
162 //NOT_PRODUCT({ FlagSetting fs(TraceMethodHandles, true); trace_method_handle(_masm, "LZMH"); });
163
164 // Load the invoker, as MH -> MH.form -> LF.vmentry
165 __ verify_oop(recv);
166 __ load_heap_oop(method_temp, Address(recv, NONZERO(java_lang_invoke_MethodHandle::form_offset_in_bytes())));
167 __ verify_oop(method_temp);
168 __ load_heap_oop(method_temp, Address(method_temp, NONZERO(java_lang_invoke_LambdaForm::vmentry_offset_in_bytes())));
169 __ verify_oop(method_temp);
170 // the following assumes that a Method* is normally compressed in the vmtarget field:
171 __ movptr(method_temp, Address(method_temp, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes())));
172
173 if (VerifyMethodHandles && !for_compiler_entry) {
174 // make sure recv is already on stack
175 __ movptr(temp2, Address(method_temp, Method::const_offset()));
176 __ load_sized_value(temp2,
177 Address(temp2, ConstMethod::size_of_parameters_offset()),
178 sizeof(u2), /*is_signed*/ false);
179 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), "");
180 Label L;
181 __ cmpptr(recv, __ argument_address(temp2, -1));
182 __ jcc(Assembler::equal, L);
183 __ movptr(rax, __ argument_address(temp2, -1));
184 __ STOP("receiver not on stack");
185 __ BIND(L);
186 }
187
188 jump_from_method_handle(_masm, method_temp, temp2, for_compiler_entry);
189 BLOCK_COMMENT("} jump_to_lambda_form");
190 }
191
192
193 // Code generation
194 address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* _masm,
195 vmIntrinsics::ID iid) {
196 const bool not_for_compiler_entry = false; // this is the interpreter entry
197 assert(is_signature_polymorphic(iid), "expected invoke iid");
198 if (iid == vmIntrinsics::_invokeGeneric ||
199 iid == vmIntrinsics::_compiledLambdaForm) {
200 // Perhaps surprisingly, the symbolic references visible to Java are not directly used.
201 // They are linked to Java-generated adapters via MethodHandleNatives.linkMethod.
202 // They all allow an appendix argument.
203 __ hlt(); // empty stubs make SG sick
204 return NULL;
205 }
206
207 // rsi/r13: sender SP (must preserve; see prepare_to_jump_from_interpreted)
208 // rbx: Method*
209 // rdx: argument locator (parameter slot count, added to rsp)
210 // rcx: used as temp to hold mh or receiver
211 // rax, rdi: garbage temps, blown away
212 Register rdx_argp = rdx; // argument list ptr, live on error paths
213 Register rax_temp = rax;
214 Register rcx_mh = rcx; // MH receiver; dies quickly and is recycled
215 Register rbx_method = rbx; // eventual target of this invocation
216
217 // here's where control starts out:
218 __ align(CodeEntryAlignment);
219 address entry_point = __ pc();
220
221 if (VerifyMethodHandles) {
222 Label L;
223 BLOCK_COMMENT("verify_intrinsic_id {");
224 __ cmpb(Address(rbx_method, Method::intrinsic_id_offset_in_bytes()), (int) iid);
225 __ jcc(Assembler::equal, L);
226 if (iid == vmIntrinsics::_linkToVirtual ||
227 iid == vmIntrinsics::_linkToSpecial) {
228 // could do this for all kinds, but would explode assembly code size
229 trace_method_handle(_masm, "bad Method*::intrinsic_id");
230 }
231 __ STOP("bad Method*::intrinsic_id");
232 __ bind(L);
233 BLOCK_COMMENT("} verify_intrinsic_id");
234 }
235
236 // First task: Find out how big the argument list is.
237 Address rdx_first_arg_addr;
238 int ref_kind = signature_polymorphic_intrinsic_ref_kind(iid);
239 assert(ref_kind != 0 || iid == vmIntrinsics::_invokeBasic, "must be _invokeBasic or a linkTo intrinsic");
240 if (ref_kind == 0 || MethodHandles::ref_kind_has_receiver(ref_kind)) {
241 __ movptr(rdx_argp, Address(rbx_method, Method::const_offset()));
242 __ load_sized_value(rdx_argp,
243 Address(rdx_argp, ConstMethod::size_of_parameters_offset()),
244 sizeof(u2), /*is_signed*/ false);
245 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), "");
246 rdx_first_arg_addr = __ argument_address(rdx_argp, -1);
247 } else {
248 DEBUG_ONLY(rdx_argp = noreg);
249 }
250
251 if (!is_signature_polymorphic_static(iid)) {
252 __ movptr(rcx_mh, rdx_first_arg_addr);
253 DEBUG_ONLY(rdx_argp = noreg);
254 }
255
256 // rdx_first_arg_addr is live!
257
258 trace_method_handle_interpreter_entry(_masm, iid);
259
260 if (iid == vmIntrinsics::_invokeBasic) {
261 generate_method_handle_dispatch(_masm, iid, rcx_mh, noreg, not_for_compiler_entry);
262
263 } else {
264 // Adjust argument list by popping the trailing MemberName argument.
265 Register rcx_recv = noreg;
266 if (MethodHandles::ref_kind_has_receiver(ref_kind)) {
267 // Load the receiver (not the MH; the actual MemberName's receiver) up from the interpreter stack.
268 __ movptr(rcx_recv = rcx, rdx_first_arg_addr);
269 }
270 DEBUG_ONLY(rdx_argp = noreg);
271 Register rbx_member = rbx_method; // MemberName ptr; incoming method ptr is dead now
272 __ pop(rax_temp); // return address
273 __ pop(rbx_member); // extract last argument
274 __ push(rax_temp); // re-push return address
275 generate_method_handle_dispatch(_masm, iid, rcx_recv, rbx_member, not_for_compiler_entry);
276 }
277
278 return entry_point;
279 }
280
281 void MethodHandles::generate_method_handle_dispatch(MacroAssembler* _masm,
282 vmIntrinsics::ID iid,
283 Register receiver_reg,
284 Register member_reg,
285 bool for_compiler_entry) {
286 assert(is_signature_polymorphic(iid), "expected invoke iid");
287 Register rbx_method = rbx; // eventual target of this invocation
288 // temps used in this code are not used in *either* compiled or interpreted calling sequences
289 #ifdef _LP64
290 Register temp1 = rscratch1;
291 Register temp2 = rscratch2;
292 Register temp3 = rax;
293 if (for_compiler_entry) {
294 assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : j_rarg0), "only valid assignment");
295 assert_different_registers(temp1, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5);
296 assert_different_registers(temp2, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5);
297 assert_different_registers(temp3, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5);
298 }
299 #else
300 Register temp1 = (for_compiler_entry ? rsi : rdx);
301 Register temp2 = rdi;
302 Register temp3 = rax;
303 if (for_compiler_entry) {
304 assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : rcx), "only valid assignment");
305 assert_different_registers(temp1, rcx, rdx);
306 assert_different_registers(temp2, rcx, rdx);
307 assert_different_registers(temp3, rcx, rdx);
308 }
309 #endif
310 else {
311 assert_different_registers(temp1, temp2, temp3, saved_last_sp_register()); // don't trash lastSP
312 }
313 assert_different_registers(temp1, temp2, temp3, receiver_reg);
314 assert_different_registers(temp1, temp2, temp3, member_reg);
315
316 if (iid == vmIntrinsics::_invokeBasic) {
317 // indirect through MH.form.vmentry.vmtarget
318 jump_to_lambda_form(_masm, receiver_reg, rbx_method, temp1, for_compiler_entry);
319
320 } else {
321 // The method is a member invoker used by direct method handles.
322 if (VerifyMethodHandles) {
323 // make sure the trailing argument really is a MemberName (caller responsibility)
324 verify_klass(_masm, member_reg, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_invoke_MemberName),
325 "MemberName required for invokeVirtual etc.");
326 }
327
328 Address member_clazz( member_reg, NONZERO(java_lang_invoke_MemberName::clazz_offset_in_bytes()));
329 Address member_vmindex( member_reg, NONZERO(java_lang_invoke_MemberName::vmindex_offset_in_bytes()));
330 Address member_vmtarget( member_reg, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes()));
331
332 Register temp1_recv_klass = temp1;
333 if (iid != vmIntrinsics::_linkToStatic) {
334 __ verify_oop(receiver_reg);
335 if (iid == vmIntrinsics::_linkToSpecial) {
336 // Don't actually load the klass; just null-check the receiver.
337 __ null_check(receiver_reg);
338 } else {
339 // load receiver klass itself
340 __ null_check(receiver_reg, oopDesc::klass_offset_in_bytes());
341 __ load_klass(temp1_recv_klass, receiver_reg);
342 __ verify_klass_ptr(temp1_recv_klass);
343 }
344 BLOCK_COMMENT("check_receiver {");
345 // The receiver for the MemberName must be in receiver_reg.
346 // Check the receiver against the MemberName.clazz
347 if (VerifyMethodHandles && iid == vmIntrinsics::_linkToSpecial) {
348 // Did not load it above...
349 __ load_klass(temp1_recv_klass, receiver_reg);
350 __ verify_klass_ptr(temp1_recv_klass);
351 }
352 if (VerifyMethodHandles && iid != vmIntrinsics::_linkToInterface) {
353 Label L_ok;
354 Register temp2_defc = temp2;
355 __ load_heap_oop(temp2_defc, member_clazz);
356 load_klass_from_Class(_masm, temp2_defc);
357 __ verify_klass_ptr(temp2_defc);
358 __ check_klass_subtype(temp1_recv_klass, temp2_defc, temp3, L_ok);
359 // If we get here, the type check failed!
360 __ STOP("receiver class disagrees with MemberName.clazz");
361 __ bind(L_ok);
362 }
363 BLOCK_COMMENT("} check_receiver");
364 }
365 if (iid == vmIntrinsics::_linkToSpecial ||
366 iid == vmIntrinsics::_linkToStatic) {
367 DEBUG_ONLY(temp1_recv_klass = noreg); // these guys didn't load the recv_klass
368 }
369
370 // Live registers at this point:
371 // member_reg - MemberName that was the trailing argument
372 // temp1_recv_klass - klass of stacked receiver, if needed
373 // rsi/r13 - interpreter linkage (if interpreted)
374 // rcx, rdx, rsi, rdi, r8, r8 - compiler arguments (if compiled)
375
376 Label L_incompatible_class_change_error;
377 switch (iid) {
378 case vmIntrinsics::_linkToSpecial:
379 if (VerifyMethodHandles) {
380 verify_ref_kind(_masm, JVM_REF_invokeSpecial, member_reg, temp3);
381 }
382 __ movptr(rbx_method, member_vmtarget);
383 break;
384
385 case vmIntrinsics::_linkToStatic:
386 if (VerifyMethodHandles) {
387 verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp3);
388 }
389 __ movptr(rbx_method, member_vmtarget);
390 break;
391
392 case vmIntrinsics::_linkToVirtual:
393 {
394 // same as TemplateTable::invokevirtual,
395 // minus the CP setup and profiling:
396
397 if (VerifyMethodHandles) {
398 verify_ref_kind(_masm, JVM_REF_invokeVirtual, member_reg, temp3);
399 }
400
401 // pick out the vtable index from the MemberName, and then we can discard it:
402 Register temp2_index = temp2;
403 __ movptr(temp2_index, member_vmindex);
404
405 if (VerifyMethodHandles) {
406 Label L_index_ok;
407 __ cmpl(temp2_index, 0);
408 __ jcc(Assembler::greaterEqual, L_index_ok);
409 __ STOP("no virtual index");
410 __ BIND(L_index_ok);
411 }
412
413 // Note: The verifier invariants allow us to ignore MemberName.clazz and vmtarget
414 // at this point. And VerifyMethodHandles has already checked clazz, if needed.
415
416 // get target Method* & entry point
417 __ lookup_virtual_method(temp1_recv_klass, temp2_index, rbx_method);
418 break;
419 }
420
421 case vmIntrinsics::_linkToInterface:
422 {
423 // same as TemplateTable::invokeinterface
424 // (minus the CP setup and profiling, with different argument motion)
425 if (VerifyMethodHandles) {
426 verify_ref_kind(_masm, JVM_REF_invokeInterface, member_reg, temp3);
427 }
428
429 Register temp3_intf = temp3;
430 __ load_heap_oop(temp3_intf, member_clazz);
431 load_klass_from_Class(_masm, temp3_intf);
432 __ verify_klass_ptr(temp3_intf);
433
434 Register rbx_index = rbx_method;
435 __ movptr(rbx_index, member_vmindex);
436 if (VerifyMethodHandles) {
437 Label L;
438 __ cmpl(rbx_index, 0);
439 __ jcc(Assembler::greaterEqual, L);
440 __ STOP("invalid vtable index for MH.invokeInterface");
441 __ bind(L);
442 }
443
444 // given intf, index, and recv klass, dispatch to the implementation method
445 __ lookup_interface_method(temp1_recv_klass, temp3_intf,
446 // note: next two args must be the same:
447 rbx_index, rbx_method,
448 temp2,
449 L_incompatible_class_change_error);
450 break;
451 }
452
453 default:
454 fatal(err_msg_res("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid)));
455 break;
456 }
457
458 // Live at this point:
459 // rbx_method
460 // rsi/r13 (if interpreted)
461
462 // After figuring out which concrete method to call, jump into it.
463 // Note that this works in the interpreter with no data motion.
464 // But the compiled version will require that rcx_recv be shifted out.
465 __ verify_method_ptr(rbx_method);
466 jump_from_method_handle(_masm, rbx_method, temp1, for_compiler_entry);
467
468 if (iid == vmIntrinsics::_linkToInterface) {
469 __ bind(L_incompatible_class_change_error);
470 __ jump(RuntimeAddress(StubRoutines::throw_IncompatibleClassChangeError_entry()));
471 }
472 }
473 }
474
475 #ifndef PRODUCT
476 void trace_method_handle_stub(const char* adaptername,
477 oop mh,
478 intptr_t* saved_regs,
479 intptr_t* entry_sp) {
480 // called as a leaf from native code: do not block the JVM!
481 bool has_mh = (strstr(adaptername, "/static") == NULL &&
482 strstr(adaptername, "linkTo") == NULL); // static linkers don't have MH
483 const char* mh_reg_name = has_mh ? "rcx_mh" : "rcx";
484 tty->print_cr("MH %s %s="PTR_FORMAT" sp="PTR_FORMAT,
485 adaptername, mh_reg_name,
486 (void *)mh, entry_sp);
487
488 if (Verbose) {
489 tty->print_cr("Registers:");
490 const int saved_regs_count = RegisterImpl::number_of_registers;
491 for (int i = 0; i < saved_regs_count; i++) {
492 Register r = as_Register(i);
493 // The registers are stored in reverse order on the stack (by pusha).
494 tty->print("%3s=" PTR_FORMAT, r->name(), saved_regs[((saved_regs_count - 1) - i)]);
495 if ((i + 1) % 4 == 0) {
496 tty->cr();
497 } else {
498 tty->print(", ");
499 }
500 }
501 tty->cr();
502
503 {
504 // dumping last frame with frame::describe
505
506 JavaThread* p = JavaThread::active();
507
508 ResourceMark rm;
509 PRESERVE_EXCEPTION_MARK; // may not be needed by safer and unexpensive here
510 FrameValues values;
511
512 // Note: We want to allow trace_method_handle from any call site.
513 // While trace_method_handle creates a frame, it may be entered
514 // without a PC on the stack top (e.g. not just after a call).
515 // Walking that frame could lead to failures due to that invalid PC.
516 // => carefully detect that frame when doing the stack walking
517
518 // Current C frame
519 frame cur_frame = os::current_frame();
520
521 // Robust search of trace_calling_frame (independant of inlining).
522 // Assumes saved_regs comes from a pusha in the trace_calling_frame.
523 assert(cur_frame.sp() < saved_regs, "registers not saved on stack ?");
524 frame trace_calling_frame = os::get_sender_for_C_frame(&cur_frame);
525 while (trace_calling_frame.fp() < saved_regs) {
526 trace_calling_frame = os::get_sender_for_C_frame(&trace_calling_frame);
527 }
528
529 // safely create a frame and call frame::describe
530 intptr_t *dump_sp = trace_calling_frame.sender_sp();
531 intptr_t *dump_fp = trace_calling_frame.link();
532
533 bool walkable = has_mh; // whether the traced frame shoud be walkable
534
535 if (walkable) {
536 // The previous definition of walkable may have to be refined
537 // if new call sites cause the next frame constructor to start
538 // failing. Alternatively, frame constructors could be
539 // modified to support the current or future non walkable
540 // frames (but this is more intrusive and is not considered as
541 // part of this RFE, which will instead use a simpler output).
542 frame dump_frame = frame(dump_sp, dump_fp);
543 dump_frame.describe(values, 1);
544 } else {
545 // Stack may not be walkable (invalid PC above FP):
546 // Add descriptions without building a Java frame to avoid issues
547 values.describe(-1, dump_fp, "fp for #1 <not parsed, cannot trust pc>");
548 values.describe(-1, dump_sp, "sp for #1");
549 }
550 values.describe(-1, entry_sp, "raw top of stack");
551
552 tty->print_cr("Stack layout:");
553 values.print(p);
554 }
555 if (has_mh && mh->is_oop()) {
556 mh->print();
557 if (java_lang_invoke_MethodHandle::is_instance(mh)) {
558 if (java_lang_invoke_MethodHandle::form_offset_in_bytes() != 0)
559 java_lang_invoke_MethodHandle::form(mh)->print();
560 }
561 }
562 }
563 }
564
565 // The stub wraps the arguments in a struct on the stack to avoid
566 // dealing with the different calling conventions for passing 6
567 // arguments.
568 struct MethodHandleStubArguments {
569 const char* adaptername;
570 oopDesc* mh;
571 intptr_t* saved_regs;
572 intptr_t* entry_sp;
573 };
574 void trace_method_handle_stub_wrapper(MethodHandleStubArguments* args) {
575 trace_method_handle_stub(args->adaptername,
576 args->mh,
577 args->saved_regs,
578 args->entry_sp);
579 }
580
581 void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) {
582 if (!TraceMethodHandles) return;
583 BLOCK_COMMENT("trace_method_handle {");
584 __ enter();
585 __ andptr(rsp, -16); // align stack if needed for FPU state
586 __ pusha();
587 __ mov(rbx, rsp); // for retreiving saved_regs
588 // Note: saved_regs must be in the entered frame for the
589 // robust stack walking implemented in trace_method_handle_stub.
590
591 // save FP result, valid at some call sites (adapter_opt_return_float, ...)
592 __ increment(rsp, -2 * wordSize);
593 if (UseSSE >= 2) {
594 __ movdbl(Address(rsp, 0), xmm0);
595 } else if (UseSSE == 1) {
596 __ movflt(Address(rsp, 0), xmm0);
597 } else {
598 __ fst_d(Address(rsp, 0));
599 }
600
601 // Incoming state:
602 // rcx: method handle
603 //
604 // To avoid calling convention issues, build a record on the stack
605 // and pass the pointer to that instead.
606 __ push(rbp); // entry_sp (with extra align space)
607 __ push(rbx); // pusha saved_regs
608 __ push(rcx); // mh
609 __ push(rcx); // slot for adaptername
610 __ movptr(Address(rsp, 0), (intptr_t) adaptername);
611 __ super_call_VM_leaf(CAST_FROM_FN_PTR(address, trace_method_handle_stub_wrapper), rsp);
612 __ increment(rsp, sizeof(MethodHandleStubArguments));
613
614 if (UseSSE >= 2) {
615 __ movdbl(xmm0, Address(rsp, 0));
616 } else if (UseSSE == 1) {
617 __ movflt(xmm0, Address(rsp, 0));
618 } else {
619 __ fld_d(Address(rsp, 0));
620 }
621 __ increment(rsp, 2 * wordSize);
622
623 __ popa();
624 __ leave();
625 BLOCK_COMMENT("} trace_method_handle");
626 }
627 #endif //PRODUCT