1 /*
2 * Copyright (c) 1997, 2016, 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/methodHandles.hpp"
33
34 #define __ _masm->
35
36 #ifdef PRODUCT
37 #define BLOCK_COMMENT(str) /* nothing */
38 #define STOP(error) stop(error)
39 #else
40 #define BLOCK_COMMENT(str) __ block_comment(str)
41 #define STOP(error) block_comment(error); __ stop(error)
42 #endif
43
44 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":")
45
46 void MethodHandles::load_klass_from_Class(MacroAssembler* _masm, Register klass_reg) {
47 if (VerifyMethodHandles)
48 verify_klass(_masm, klass_reg, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_Class),
49 "MH argument is a Class");
50 __ movptr(klass_reg, Address(klass_reg, java_lang_Class::klass_offset_in_bytes()));
51 }
52
53 #ifdef ASSERT
54 static int check_nonzero(const char* xname, int x) {
55 assert(x != 0, "%s should be nonzero", xname);
56 return x;
57 }
58 #define NONZERO(x) check_nonzero(#x, x)
59 #else //ASSERT
60 #define NONZERO(x) (x)
61 #endif //ASSERT
62
63 #ifdef ASSERT
64 void MethodHandles::verify_klass(MacroAssembler* _masm,
65 Register obj, SystemDictionary::WKID klass_id,
66 const char* error_message) {
67 InstanceKlass** klass_addr = SystemDictionary::well_known_klass_addr(klass_id);
68 KlassHandle klass = SystemDictionary::well_known_klass(klass_id);
69 Register temp = rdi;
70 Register temp2 = noreg;
71 LP64_ONLY(temp2 = rscratch1); // used by MacroAssembler::cmpptr
72 Label L_ok, L_bad;
73 BLOCK_COMMENT("verify_klass {");
74 __ verify_oop(obj);
75 __ testptr(obj, obj);
76 __ jcc(Assembler::zero, L_bad);
77 __ push(temp); if (temp2 != noreg) __ push(temp2);
78 #define UNPUSH { if (temp2 != noreg) __ pop(temp2); __ pop(temp); }
79 __ load_klass(temp, obj);
80 __ cmpptr(temp, ExternalAddress((address) klass_addr));
81 __ jcc(Assembler::equal, L_ok);
82 intptr_t super_check_offset = klass->super_check_offset();
83 __ movptr(temp, Address(temp, super_check_offset));
84 __ cmpptr(temp, ExternalAddress((address) klass_addr));
85 __ jcc(Assembler::equal, L_ok);
86 UNPUSH;
87 __ bind(L_bad);
88 __ STOP(error_message);
89 __ BIND(L_ok);
90 UNPUSH;
91 BLOCK_COMMENT("} verify_klass");
92 }
93
94 void MethodHandles::verify_ref_kind(MacroAssembler* _masm, int ref_kind, Register member_reg, Register temp) {
95 Label L;
96 BLOCK_COMMENT("verify_ref_kind {");
97 __ movl(temp, Address(member_reg, NONZERO(java_lang_invoke_MemberName::flags_offset_in_bytes())));
98 __ shrl(temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT);
99 __ andl(temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK);
100 __ cmpl(temp, ref_kind);
101 __ jcc(Assembler::equal, L);
102 { char* buf = NEW_C_HEAP_ARRAY(char, 100, mtInternal);
103 jio_snprintf(buf, 100, "verify_ref_kind expected %x", ref_kind);
104 if (ref_kind == JVM_REF_invokeVirtual ||
105 ref_kind == JVM_REF_invokeSpecial)
106 // could do this for all ref_kinds, but would explode assembly code size
107 trace_method_handle(_masm, buf);
108 __ STOP(buf);
109 }
110 BLOCK_COMMENT("} verify_ref_kind");
111 __ bind(L);
112 }
113
114 #endif //ASSERT
115
116 void MethodHandles::jump_from_method_handle(MacroAssembler* _masm, Register method, Register temp,
117 bool for_compiler_entry) {
118 assert(method == rbx, "interpreter calling convention");
119
120 Label L_no_such_method;
121 __ testptr(rbx, rbx);
122 __ jcc(Assembler::zero, L_no_such_method);
123
124 __ verify_method_ptr(method);
125
126 if (!for_compiler_entry && JvmtiExport::can_post_interpreter_events()) {
127 Label run_compiled_code;
128 // JVMTI events, such as single-stepping, are implemented partly by avoiding running
129 // compiled code in threads for which the event is enabled. Check here for
130 // interp_only_mode if these events CAN be enabled.
131 #ifdef _LP64
132 Register rthread = r15_thread;
133 #else
134 Register rthread = temp;
135 __ get_thread(rthread);
136 #endif
137 // interp_only is an int, on little endian it is sufficient to test the byte only
138 // Is a cmpl faster?
139 __ cmpb(Address(rthread, JavaThread::interp_only_mode_offset()), 0);
140 __ jccb(Assembler::zero, run_compiled_code);
141 __ jmp(Address(method, Method::interpreter_entry_offset()));
142 __ BIND(run_compiled_code);
143 }
144
145 const ByteSize entry_offset = for_compiler_entry ? Method::from_compiled_offset() :
146 Method::from_interpreted_offset();
147 __ jmp(Address(method, entry_offset));
148
149 __ bind(L_no_such_method);
150 __ jump(RuntimeAddress(StubRoutines::throw_AbstractMethodError_entry()));
151 }
152
153 void MethodHandles::jump_to_lambda_form(MacroAssembler* _masm,
154 Register recv, Register method_temp,
155 Register temp2,
156 bool for_compiler_entry) {
157 BLOCK_COMMENT("jump_to_lambda_form {");
158 // This is the initial entry point of a lazy method handle.
159 // After type checking, it picks up the invoker from the LambdaForm.
160 assert_different_registers(recv, method_temp, temp2);
161 assert(recv != noreg, "required register");
162 assert(method_temp == rbx, "required register for loading method");
163
164 //NOT_PRODUCT({ FlagSetting fs(TraceMethodHandles, true); trace_method_handle(_masm, "LZMH"); });
165
166 // Load the invoker, as MH -> MH.form -> LF.vmentry
167 __ verify_oop(recv);
168 __ load_heap_oop(method_temp, Address(recv, NONZERO(java_lang_invoke_MethodHandle::form_offset_in_bytes())));
169 __ verify_oop(method_temp);
170 __ load_heap_oop(method_temp, Address(method_temp, NONZERO(java_lang_invoke_LambdaForm::vmentry_offset_in_bytes())));
171 __ verify_oop(method_temp);
172 // the following assumes that a Method* is normally compressed in the vmtarget field:
173 __ movptr(method_temp, Address(method_temp, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes())));
174
175 if (VerifyMethodHandles && !for_compiler_entry) {
176 // make sure recv is already on stack
177 __ movptr(temp2, Address(method_temp, Method::const_offset()));
178 __ load_sized_value(temp2,
179 Address(temp2, ConstMethod::size_of_parameters_offset()),
180 sizeof(u2), /*is_signed*/ false);
181 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), "");
182 Label L;
183 __ cmpptr(recv, __ argument_address(temp2, -1));
184 __ jcc(Assembler::equal, L);
185 __ movptr(rax, __ argument_address(temp2, -1));
186 __ STOP("receiver not on stack");
187 __ BIND(L);
188 }
189
190 jump_from_method_handle(_masm, method_temp, temp2, for_compiler_entry);
191 BLOCK_COMMENT("} jump_to_lambda_form");
192 }
193
194
195 // Code generation
196 address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* _masm,
197 vmIntrinsics::ID iid) {
198 const bool not_for_compiler_entry = false; // this is the interpreter entry
199 assert(is_signature_polymorphic(iid), "expected invoke iid");
200 if (iid == vmIntrinsics::_invokeGeneric ||
201 iid == vmIntrinsics::_compiledLambdaForm) {
202 // Perhaps surprisingly, the symbolic references visible to Java are not directly used.
203 // They are linked to Java-generated adapters via MethodHandleNatives.linkMethod.
204 // They all allow an appendix argument.
205 __ hlt(); // empty stubs make SG sick
206 return NULL;
207 }
208
209 // rsi/r13: sender SP (must preserve; see prepare_to_jump_from_interpreted)
210 // rbx: Method*
211 // rdx: argument locator (parameter slot count, added to rsp)
212 // rcx: used as temp to hold mh or receiver
213 // rax, rdi: garbage temps, blown away
214 Register rdx_argp = rdx; // argument list ptr, live on error paths
215 Register rax_temp = rax;
216 Register rcx_mh = rcx; // MH receiver; dies quickly and is recycled
217 Register rbx_method = rbx; // eventual target of this invocation
218
219 // here's where control starts out:
220 __ align(CodeEntryAlignment);
221 address entry_point = __ pc();
222
223 if (VerifyMethodHandles) {
224 assert(Method::intrinsic_id_size_in_bytes() == 2, "assuming Method::_intrinsic_id is u2");
225
226 Label L;
227 BLOCK_COMMENT("verify_intrinsic_id {");
228 __ cmpw(Address(rbx_method, Method::intrinsic_id_offset_in_bytes()), (int) iid);
229 __ jcc(Assembler::equal, L);
230 if (iid == vmIntrinsics::_linkToVirtual ||
231 iid == vmIntrinsics::_linkToSpecial) {
232 // could do this for all kinds, but would explode assembly code size
233 trace_method_handle(_masm, "bad Method*::intrinsic_id");
234 }
235 __ STOP("bad Method*::intrinsic_id");
236 __ bind(L);
237 BLOCK_COMMENT("} verify_intrinsic_id");
238 }
239
240 // First task: Find out how big the argument list is.
241 Address rdx_first_arg_addr;
242 int ref_kind = signature_polymorphic_intrinsic_ref_kind(iid);
243 assert(ref_kind != 0 || iid == vmIntrinsics::_invokeBasic, "must be _invokeBasic or a linkTo intrinsic");
244 if (ref_kind == 0 || MethodHandles::ref_kind_has_receiver(ref_kind)) {
245 __ movptr(rdx_argp, Address(rbx_method, Method::const_offset()));
246 __ load_sized_value(rdx_argp,
247 Address(rdx_argp, ConstMethod::size_of_parameters_offset()),
248 sizeof(u2), /*is_signed*/ false);
249 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), "");
250 rdx_first_arg_addr = __ argument_address(rdx_argp, -1);
251 } else {
252 DEBUG_ONLY(rdx_argp = noreg);
253 }
254
255 if (!is_signature_polymorphic_static(iid)) {
256 __ movptr(rcx_mh, rdx_first_arg_addr);
257 DEBUG_ONLY(rdx_argp = noreg);
258 }
259
260 // rdx_first_arg_addr is live!
261
262 trace_method_handle_interpreter_entry(_masm, iid);
263
264 if (iid == vmIntrinsics::_invokeBasic) {
265 generate_method_handle_dispatch(_masm, iid, rcx_mh, noreg, not_for_compiler_entry);
266
267 } else {
268 // Adjust argument list by popping the trailing MemberName argument.
269 Register rcx_recv = noreg;
270 if (MethodHandles::ref_kind_has_receiver(ref_kind)) {
271 // Load the receiver (not the MH; the actual MemberName's receiver) up from the interpreter stack.
272 __ movptr(rcx_recv = rcx, rdx_first_arg_addr);
273 }
274 DEBUG_ONLY(rdx_argp = noreg);
275 Register rbx_member = rbx_method; // MemberName ptr; incoming method ptr is dead now
276 __ pop(rax_temp); // return address
277 __ pop(rbx_member); // extract last argument
278 __ push(rax_temp); // re-push return address
279 generate_method_handle_dispatch(_masm, iid, rcx_recv, rbx_member, not_for_compiler_entry);
280 }
281
282 return entry_point;
283 }
284
285 void MethodHandles::generate_method_handle_dispatch(MacroAssembler* _masm,
286 vmIntrinsics::ID iid,
287 Register receiver_reg,
288 Register member_reg,
289 bool for_compiler_entry) {
290 assert(is_signature_polymorphic(iid), "expected invoke iid");
291 Register rbx_method = rbx; // eventual target of this invocation
292 // temps used in this code are not used in *either* compiled or interpreted calling sequences
293 #ifdef _LP64
294 Register temp1 = rscratch1;
295 Register temp2 = rscratch2;
296 Register temp3 = rax;
297 if (for_compiler_entry) {
298 assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : j_rarg0), "only valid assignment");
299 assert_different_registers(temp1, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5);
300 assert_different_registers(temp2, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5);
301 assert_different_registers(temp3, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5);
302 }
303 #else
304 Register temp1 = (for_compiler_entry ? rsi : rdx);
305 Register temp2 = rdi;
306 Register temp3 = rax;
307 if (for_compiler_entry) {
308 assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : rcx), "only valid assignment");
309 assert_different_registers(temp1, rcx, rdx);
310 assert_different_registers(temp2, rcx, rdx);
311 assert_different_registers(temp3, rcx, rdx);
312 }
313 #endif
314 else {
315 assert_different_registers(temp1, temp2, temp3, saved_last_sp_register()); // don't trash lastSP
316 }
317 assert_different_registers(temp1, temp2, temp3, receiver_reg);
318 assert_different_registers(temp1, temp2, temp3, member_reg);
319
320 if (iid == vmIntrinsics::_invokeBasic) {
321 // indirect through MH.form.vmentry.vmtarget
322 jump_to_lambda_form(_masm, receiver_reg, rbx_method, temp1, for_compiler_entry);
323
324 } else {
325 // The method is a member invoker used by direct method handles.
326 if (VerifyMethodHandles) {
327 // make sure the trailing argument really is a MemberName (caller responsibility)
328 verify_klass(_masm, member_reg, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_invoke_MemberName),
329 "MemberName required for invokeVirtual etc.");
330 }
331
332 Address member_clazz( member_reg, NONZERO(java_lang_invoke_MemberName::clazz_offset_in_bytes()));
333 Address member_vmindex( member_reg, NONZERO(java_lang_invoke_MemberName::vmindex_offset_in_bytes()));
334 Address member_vmtarget( member_reg, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes()));
335
336 Register temp1_recv_klass = temp1;
337 if (iid != vmIntrinsics::_linkToStatic) {
338 __ verify_oop(receiver_reg);
339 if (iid == vmIntrinsics::_linkToSpecial) {
340 // Don't actually load the klass; just null-check the receiver.
341 __ null_check(receiver_reg);
342 } else {
343 // load receiver klass itself
344 __ null_check(receiver_reg, oopDesc::klass_offset_in_bytes());
345 __ load_klass(temp1_recv_klass, receiver_reg);
346 __ verify_klass_ptr(temp1_recv_klass);
347 }
348 BLOCK_COMMENT("check_receiver {");
349 // The receiver for the MemberName must be in receiver_reg.
350 // Check the receiver against the MemberName.clazz
351 if (VerifyMethodHandles && iid == vmIntrinsics::_linkToSpecial) {
352 // Did not load it above...
353 __ load_klass(temp1_recv_klass, receiver_reg);
354 __ verify_klass_ptr(temp1_recv_klass);
355 }
356 if (VerifyMethodHandles && iid != vmIntrinsics::_linkToInterface) {
357 Label L_ok;
358 Register temp2_defc = temp2;
359 __ load_heap_oop(temp2_defc, member_clazz);
360 load_klass_from_Class(_masm, temp2_defc);
361 __ verify_klass_ptr(temp2_defc);
362 __ check_klass_subtype(temp1_recv_klass, temp2_defc, temp3, L_ok);
363 // If we get here, the type check failed!
364 __ STOP("receiver class disagrees with MemberName.clazz");
365 __ bind(L_ok);
366 }
367 BLOCK_COMMENT("} check_receiver");
368 }
369 if (iid == vmIntrinsics::_linkToSpecial ||
370 iid == vmIntrinsics::_linkToStatic) {
371 DEBUG_ONLY(temp1_recv_klass = noreg); // these guys didn't load the recv_klass
372 }
373
374 // Live registers at this point:
375 // member_reg - MemberName that was the trailing argument
376 // temp1_recv_klass - klass of stacked receiver, if needed
377 // rsi/r13 - interpreter linkage (if interpreted)
378 // rcx, rdx, rsi, rdi, r8 - compiler arguments (if compiled)
379
380 Label L_incompatible_class_change_error;
381 switch (iid) {
382 case vmIntrinsics::_linkToSpecial:
383 if (VerifyMethodHandles) {
384 verify_ref_kind(_masm, JVM_REF_invokeSpecial, member_reg, temp3);
385 }
386 __ movptr(rbx_method, member_vmtarget);
387 break;
388
389 case vmIntrinsics::_linkToStatic:
390 if (VerifyMethodHandles) {
391 verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp3);
392 }
393 __ movptr(rbx_method, member_vmtarget);
394 break;
395
396 case vmIntrinsics::_linkToVirtual:
397 {
398 // same as TemplateTable::invokevirtual,
399 // minus the CP setup and profiling:
400
401 if (VerifyMethodHandles) {
402 verify_ref_kind(_masm, JVM_REF_invokeVirtual, member_reg, temp3);
403 }
404
405 // pick out the vtable index from the MemberName, and then we can discard it:
406 Register temp2_index = temp2;
407 __ movptr(temp2_index, member_vmindex);
408
409 if (VerifyMethodHandles) {
410 Label L_index_ok;
411 __ cmpl(temp2_index, 0);
412 __ jcc(Assembler::greaterEqual, L_index_ok);
413 __ STOP("no virtual index");
414 __ BIND(L_index_ok);
415 }
416
417 // Note: The verifier invariants allow us to ignore MemberName.clazz and vmtarget
418 // at this point. And VerifyMethodHandles has already checked clazz, if needed.
419
420 // get target Method* & entry point
421 __ lookup_virtual_method(temp1_recv_klass, temp2_index, rbx_method);
422 break;
423 }
424
425 case vmIntrinsics::_linkToInterface:
426 {
427 // same as TemplateTable::invokeinterface
428 // (minus the CP setup and profiling, with different argument motion)
429 if (VerifyMethodHandles) {
430 verify_ref_kind(_masm, JVM_REF_invokeInterface, member_reg, temp3);
431 }
432
433 Register temp3_intf = temp3;
434 __ load_heap_oop(temp3_intf, member_clazz);
435 load_klass_from_Class(_masm, temp3_intf);
436 __ verify_klass_ptr(temp3_intf);
437
438 Register rbx_index = rbx_method;
439 __ movptr(rbx_index, member_vmindex);
440 if (VerifyMethodHandles) {
441 Label L;
442 __ cmpl(rbx_index, 0);
443 __ jcc(Assembler::greaterEqual, L);
444 __ STOP("invalid vtable index for MH.invokeInterface");
445 __ bind(L);
446 }
447
448 // given intf, index, and recv klass, dispatch to the implementation method
449 __ lookup_interface_method(temp1_recv_klass, temp3_intf,
450 // note: next two args must be the same:
451 rbx_index, rbx_method,
452 temp2,
453 L_incompatible_class_change_error);
454 break;
455 }
456
457 default:
458 fatal("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid));
459 break;
460 }
461
462 // Live at this point:
463 // rbx_method
464 // rsi/r13 (if interpreted)
465
466 // After figuring out which concrete method to call, jump into it.
467 // Note that this works in the interpreter with no data motion.
468 // But the compiled version will require that rcx_recv be shifted out.
469 __ verify_method_ptr(rbx_method);
470 jump_from_method_handle(_masm, rbx_method, temp1, for_compiler_entry);
471
472 if (iid == vmIntrinsics::_linkToInterface) {
473 __ bind(L_incompatible_class_change_error);
474 __ jump(RuntimeAddress(StubRoutines::throw_IncompatibleClassChangeError_entry()));
475 }
476 }
477 }
478
479 #ifndef PRODUCT
480 void trace_method_handle_stub(const char* adaptername,
481 oop mh,
482 intptr_t* saved_regs,
483 intptr_t* entry_sp) {
484 // called as a leaf from native code: do not block the JVM!
485 bool has_mh = (strstr(adaptername, "/static") == NULL &&
486 strstr(adaptername, "linkTo") == NULL); // static linkers don't have MH
487 const char* mh_reg_name = has_mh ? "rcx_mh" : "rcx";
488 tty->print_cr("MH %s %s=" PTR_FORMAT " sp=" PTR_FORMAT,
489 adaptername, mh_reg_name,
490 p2i(mh), p2i(entry_sp));
491
492 if (Verbose) {
493 tty->print_cr("Registers:");
494 const int saved_regs_count = RegisterImpl::number_of_registers;
495 for (int i = 0; i < saved_regs_count; i++) {
496 Register r = as_Register(i);
497 // The registers are stored in reverse order on the stack (by pusha).
498 tty->print("%3s=" PTR_FORMAT, r->name(), saved_regs[((saved_regs_count - 1) - i)]);
499 if ((i + 1) % 4 == 0) {
500 tty->cr();
501 } else {
502 tty->print(", ");
503 }
504 }
505 tty->cr();
506
507 {
508 // dumping last frame with frame::describe
509
510 JavaThread* p = JavaThread::active();
511
512 ResourceMark rm;
513 PRESERVE_EXCEPTION_MARK; // may not be needed by safer and unexpensive here
514 FrameValues values;
515
516 // Note: We want to allow trace_method_handle from any call site.
517 // While trace_method_handle creates a frame, it may be entered
518 // without a PC on the stack top (e.g. not just after a call).
519 // Walking that frame could lead to failures due to that invalid PC.
520 // => carefully detect that frame when doing the stack walking
521
522 // Current C frame
523 frame cur_frame = os::current_frame();
524
525 // Robust search of trace_calling_frame (independant of inlining).
526 // Assumes saved_regs comes from a pusha in the trace_calling_frame.
527 assert(cur_frame.sp() < saved_regs, "registers not saved on stack ?");
528 frame trace_calling_frame = os::get_sender_for_C_frame(&cur_frame);
529 while (trace_calling_frame.fp() < saved_regs) {
530 trace_calling_frame = os::get_sender_for_C_frame(&trace_calling_frame);
531 }
532
533 // safely create a frame and call frame::describe
534 intptr_t *dump_sp = trace_calling_frame.sender_sp();
535 intptr_t *dump_fp = trace_calling_frame.link();
536
537 bool walkable = has_mh; // whether the traced frame shoud be walkable
538
539 if (walkable) {
540 // The previous definition of walkable may have to be refined
541 // if new call sites cause the next frame constructor to start
542 // failing. Alternatively, frame constructors could be
543 // modified to support the current or future non walkable
544 // frames (but this is more intrusive and is not considered as
545 // part of this RFE, which will instead use a simpler output).
546 frame dump_frame = frame(dump_sp, dump_fp);
547 dump_frame.describe(values, 1);
548 } else {
549 // Stack may not be walkable (invalid PC above FP):
550 // Add descriptions without building a Java frame to avoid issues
551 values.describe(-1, dump_fp, "fp for #1 <not parsed, cannot trust pc>");
552 values.describe(-1, dump_sp, "sp for #1");
553 }
554 values.describe(-1, entry_sp, "raw top of stack");
555
556 tty->print_cr("Stack layout:");
557 values.print(p);
558 }
559 if (has_mh && mh->is_oop()) {
560 mh->print();
561 if (java_lang_invoke_MethodHandle::is_instance(mh)) {
562 if (java_lang_invoke_MethodHandle::form_offset_in_bytes() != 0)
563 java_lang_invoke_MethodHandle::form(mh)->print();
564 }
565 }
566 }
567 }
568
569 // The stub wraps the arguments in a struct on the stack to avoid
570 // dealing with the different calling conventions for passing 6
571 // arguments.
572 struct MethodHandleStubArguments {
573 const char* adaptername;
574 oopDesc* mh;
575 intptr_t* saved_regs;
576 intptr_t* entry_sp;
577 };
578 void trace_method_handle_stub_wrapper(MethodHandleStubArguments* args) {
579 trace_method_handle_stub(args->adaptername,
580 args->mh,
581 args->saved_regs,
582 args->entry_sp);
583 }
584
585 void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) {
586 if (!TraceMethodHandles) return;
587 BLOCK_COMMENT("trace_method_handle {");
588 __ enter();
589 __ andptr(rsp, -16); // align stack if needed for FPU state
590 __ pusha();
591 __ mov(rbx, rsp); // for retreiving saved_regs
592 // Note: saved_regs must be in the entered frame for the
593 // robust stack walking implemented in trace_method_handle_stub.
594
595 // save FP result, valid at some call sites (adapter_opt_return_float, ...)
596 __ increment(rsp, -2 * wordSize);
597 if (UseSSE >= 2) {
598 __ movdbl(Address(rsp, 0), xmm0);
599 } else if (UseSSE == 1) {
600 __ movflt(Address(rsp, 0), xmm0);
601 } else {
602 __ fst_d(Address(rsp, 0));
603 }
604
605 // Incoming state:
606 // rcx: method handle
607 //
608 // To avoid calling convention issues, build a record on the stack
609 // and pass the pointer to that instead.
610 __ push(rbp); // entry_sp (with extra align space)
611 __ push(rbx); // pusha saved_regs
612 __ push(rcx); // mh
613 __ push(rcx); // slot for adaptername
614 __ movptr(Address(rsp, 0), (intptr_t) adaptername);
615 __ super_call_VM_leaf(CAST_FROM_FN_PTR(address, trace_method_handle_stub_wrapper), rsp);
616 __ increment(rsp, sizeof(MethodHandleStubArguments));
617
618 if (UseSSE >= 2) {
619 __ movdbl(xmm0, Address(rsp, 0));
620 } else if (UseSSE == 1) {
621 __ movflt(xmm0, Address(rsp, 0));
622 } else {
623 __ fld_d(Address(rsp, 0));
624 }
625 __ increment(rsp, 2 * wordSize);
626
627 __ popa();
628 __ leave();
629 BLOCK_COMMENT("} trace_method_handle");
630 }
631 #endif //PRODUCT