1 /*
2 * Copyright (c) 1997, 2018, 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 "jvm.h"
27 #include "asm/macroAssembler.hpp"
28 #include "classfile/javaClasses.inline.hpp"
29 #include "interpreter/interpreter.hpp"
30 #include "interpreter/interpreterRuntime.hpp"
31 #include "memory/allocation.inline.hpp"
32 #include "memory/resourceArea.hpp"
33 #include "prims/methodHandles.hpp"
34 #include "runtime/frame.inline.hpp"
35 #include "utilities/preserveException.hpp"
36
37 #define __ _masm->
38
39 #ifdef PRODUCT
40 #define BLOCK_COMMENT(str) /* nothing */
41 #define STOP(error) stop(error)
42 #else
43 #define BLOCK_COMMENT(str) __ block_comment(str)
44 #define STOP(error) block_comment(error); __ stop(error)
45 #endif
46
47 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":")
48
49 void MethodHandles::load_klass_from_Class(MacroAssembler* _masm, Register klass_reg) {
50 if (VerifyMethodHandles)
51 verify_klass(_masm, klass_reg, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_Class),
52 "MH argument is a Class");
53 __ movptr(klass_reg, Address(klass_reg, java_lang_Class::klass_offset_in_bytes()));
54 }
55
56 #ifdef ASSERT
57 static int check_nonzero(const char* xname, int x) {
58 assert(x != 0, "%s should be nonzero", xname);
59 return x;
60 }
61 #define NONZERO(x) check_nonzero(#x, x)
62 #else //ASSERT
63 #define NONZERO(x) (x)
64 #endif //ASSERT
65
66 #ifdef ASSERT
67 void MethodHandles::verify_klass(MacroAssembler* _masm,
68 Register obj, SystemDictionary::WKID klass_id,
69 const char* error_message) {
70 InstanceKlass** klass_addr = SystemDictionary::well_known_klass_addr(klass_id);
71 Klass* klass = SystemDictionary::well_known_klass(klass_id);
72 Register temp = rdi;
73 Register temp2 = noreg;
74 LP64_ONLY(temp2 = rscratch1); // used by MacroAssembler::cmpptr
75 Label L_ok, L_bad;
76 BLOCK_COMMENT("verify_klass {");
77 __ verify_oop(obj);
78 __ testptr(obj, obj);
79 __ jcc(Assembler::zero, L_bad);
80 __ push(temp); if (temp2 != noreg) __ push(temp2);
81 #define UNPUSH { if (temp2 != noreg) __ pop(temp2); __ pop(temp); }
82 __ load_klass(temp, obj);
83 __ cmpptr(temp, ExternalAddress((address) klass_addr));
84 __ jcc(Assembler::equal, L_ok);
85 intptr_t super_check_offset = klass->super_check_offset();
86 __ movptr(temp, Address(temp, super_check_offset));
87 __ cmpptr(temp, ExternalAddress((address) klass_addr));
88 __ jcc(Assembler::equal, L_ok);
89 UNPUSH;
90 __ bind(L_bad);
91 __ STOP(error_message);
92 __ BIND(L_ok);
93 UNPUSH;
94 BLOCK_COMMENT("} verify_klass");
95 }
96
97 void MethodHandles::verify_ref_kind(MacroAssembler* _masm, int ref_kind, Register member_reg, Register temp) {
98 Label L;
99 BLOCK_COMMENT("verify_ref_kind {");
100 __ movl(temp, Address(member_reg, NONZERO(java_lang_invoke_MemberName::flags_offset_in_bytes())));
101 __ shrl(temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT);
102 __ andl(temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK);
103 __ cmpl(temp, ref_kind);
104 __ jcc(Assembler::equal, L);
105 { char* buf = NEW_C_HEAP_ARRAY(char, 100, mtInternal);
106 jio_snprintf(buf, 100, "verify_ref_kind expected %x", ref_kind);
107 if (ref_kind == JVM_REF_invokeVirtual ||
108 ref_kind == JVM_REF_invokeSpecial)
109 // could do this for all ref_kinds, but would explode assembly code size
110 trace_method_handle(_masm, buf);
111 __ STOP(buf);
112 }
113 BLOCK_COMMENT("} verify_ref_kind");
114 __ bind(L);
115 }
116
117 #endif //ASSERT
118
119 void MethodHandles::jump_from_method_handle(MacroAssembler* _masm, Register method, Register temp,
120 bool for_compiler_entry) {
121 assert(method == rbx, "interpreter calling convention");
122
123 Label L_no_such_method;
124 __ testptr(rbx, rbx);
125 __ jcc(Assembler::zero, L_no_such_method);
126
127 __ verify_method_ptr(method);
128
129 if (!for_compiler_entry && JvmtiExport::can_post_interpreter_events()) {
130 Label run_compiled_code;
131 // JVMTI events, such as single-stepping, are implemented partly by avoiding running
132 // compiled code in threads for which the event is enabled. Check here for
133 // interp_only_mode if these events CAN be enabled.
134 #ifdef _LP64
135 Register rthread = r15_thread;
136 #else
137 Register rthread = temp;
138 __ get_thread(rthread);
139 #endif
140 // interp_only is an int, on little endian it is sufficient to test the byte only
141 // Is a cmpl faster?
142 __ cmpb(Address(rthread, JavaThread::interp_only_mode_offset()), 0);
143 __ jccb(Assembler::zero, run_compiled_code);
144 __ jmp(Address(method, Method::interpreter_entry_offset()));
145 __ BIND(run_compiled_code);
146 }
147
148 const ByteSize entry_offset = for_compiler_entry ? Method::from_compiled_offset() :
149 Method::from_interpreted_offset();
150 __ jmp(Address(method, entry_offset));
151
152 __ bind(L_no_such_method);
153 __ jump(RuntimeAddress(StubRoutines::throw_AbstractMethodError_entry()));
154 }
155
156 void MethodHandles::jump_to_lambda_form(MacroAssembler* _masm,
157 Register recv, Register method_temp,
158 Register temp2,
159 bool for_compiler_entry) {
160 BLOCK_COMMENT("jump_to_lambda_form {");
161 // This is the initial entry point of a lazy method handle.
162 // After type checking, it picks up the invoker from the LambdaForm.
163 assert_different_registers(recv, method_temp, temp2);
164 assert(recv != noreg, "required register");
165 assert(method_temp == rbx, "required register for loading method");
166
167 //NOT_PRODUCT({ FlagSetting fs(TraceMethodHandles, true); trace_method_handle(_masm, "LZMH"); });
168
169 // Load the invoker, as MH -> MH.form -> LF.vmentry
170 __ verify_oop(recv);
171 __ load_heap_oop(method_temp, Address(recv, NONZERO(java_lang_invoke_MethodHandle::form_offset_in_bytes())));
172 __ verify_oop(method_temp);
173 __ load_heap_oop(method_temp, Address(method_temp, NONZERO(java_lang_invoke_LambdaForm::vmentry_offset_in_bytes())));
174 __ verify_oop(method_temp);
175 __ load_heap_oop(method_temp, Address(method_temp, NONZERO(java_lang_invoke_MemberName::method_offset_in_bytes())));
176 __ verify_oop(method_temp);
177 __ movptr(method_temp, Address(method_temp, NONZERO(java_lang_invoke_ResolvedMethodName::vmtarget_offset_in_bytes())));
178
179 if (VerifyMethodHandles && !for_compiler_entry) {
180 // make sure recv is already on stack
181 __ movptr(temp2, Address(method_temp, Method::const_offset()));
182 __ load_sized_value(temp2,
183 Address(temp2, ConstMethod::size_of_parameters_offset()),
184 sizeof(u2), /*is_signed*/ false);
185 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), "");
186 Label L;
187 __ cmpoop(recv, __ argument_address(temp2, -1));
188 __ jcc(Assembler::equal, L);
189 __ movptr(rax, __ argument_address(temp2, -1));
190 __ STOP("receiver not on stack");
191 __ BIND(L);
192 }
193
194 jump_from_method_handle(_masm, method_temp, temp2, for_compiler_entry);
195 BLOCK_COMMENT("} jump_to_lambda_form");
196 }
197
198
199 // Code generation
200 address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* _masm,
201 vmIntrinsics::ID iid) {
202 const bool not_for_compiler_entry = false; // this is the interpreter entry
203 assert(is_signature_polymorphic(iid), "expected invoke iid");
204 if (iid == vmIntrinsics::_invokeGeneric ||
205 iid == vmIntrinsics::_compiledLambdaForm) {
206 // Perhaps surprisingly, the symbolic references visible to Java are not directly used.
207 // They are linked to Java-generated adapters via MethodHandleNatives.linkMethod.
208 // They all allow an appendix argument.
209 __ hlt(); // empty stubs make SG sick
210 return NULL;
211 }
212
213 // rsi/r13: sender SP (must preserve; see prepare_to_jump_from_interpreted)
214 // rbx: Method*
215 // rdx: argument locator (parameter slot count, added to rsp)
216 // rcx: used as temp to hold mh or receiver
217 // rax, rdi: garbage temps, blown away
218 Register rdx_argp = rdx; // argument list ptr, live on error paths
219 Register rax_temp = rax;
220 Register rcx_mh = rcx; // MH receiver; dies quickly and is recycled
221 Register rbx_method = rbx; // eventual target of this invocation
222
223 // here's where control starts out:
224 __ align(CodeEntryAlignment);
225 address entry_point = __ pc();
226
227 if (VerifyMethodHandles) {
228 assert(Method::intrinsic_id_size_in_bytes() == 2, "assuming Method::_intrinsic_id is u2");
229
230 Label L;
231 BLOCK_COMMENT("verify_intrinsic_id {");
232 __ cmpw(Address(rbx_method, Method::intrinsic_id_offset_in_bytes()), (int) iid);
233 __ jcc(Assembler::equal, L);
234 if (iid == vmIntrinsics::_linkToVirtual ||
235 iid == vmIntrinsics::_linkToSpecial) {
236 // could do this for all kinds, but would explode assembly code size
237 trace_method_handle(_masm, "bad Method*::intrinsic_id");
238 }
239 __ STOP("bad Method*::intrinsic_id");
240 __ bind(L);
241 BLOCK_COMMENT("} verify_intrinsic_id");
242 }
243
244 // First task: Find out how big the argument list is.
245 Address rdx_first_arg_addr;
246 int ref_kind = signature_polymorphic_intrinsic_ref_kind(iid);
247 assert(ref_kind != 0 || iid == vmIntrinsics::_invokeBasic, "must be _invokeBasic or a linkTo intrinsic");
248 if (ref_kind == 0 || MethodHandles::ref_kind_has_receiver(ref_kind)) {
249 __ movptr(rdx_argp, Address(rbx_method, Method::const_offset()));
250 __ load_sized_value(rdx_argp,
251 Address(rdx_argp, ConstMethod::size_of_parameters_offset()),
252 sizeof(u2), /*is_signed*/ false);
253 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), "");
254 rdx_first_arg_addr = __ argument_address(rdx_argp, -1);
255 } else {
256 DEBUG_ONLY(rdx_argp = noreg);
257 }
258
259 if (!is_signature_polymorphic_static(iid)) {
260 __ movptr(rcx_mh, rdx_first_arg_addr);
261 DEBUG_ONLY(rdx_argp = noreg);
262 }
263
264 // rdx_first_arg_addr is live!
265
266 trace_method_handle_interpreter_entry(_masm, iid);
267
268 if (iid == vmIntrinsics::_invokeBasic) {
269 generate_method_handle_dispatch(_masm, iid, rcx_mh, noreg, not_for_compiler_entry);
270
271 } else {
272 // Adjust argument list by popping the trailing MemberName argument.
273 Register rcx_recv = noreg;
274 if (MethodHandles::ref_kind_has_receiver(ref_kind)) {
275 // Load the receiver (not the MH; the actual MemberName's receiver) up from the interpreter stack.
276 __ movptr(rcx_recv = rcx, rdx_first_arg_addr);
277 }
278 DEBUG_ONLY(rdx_argp = noreg);
279 Register rbx_member = rbx_method; // MemberName ptr; incoming method ptr is dead now
280 __ pop(rax_temp); // return address
281 __ pop(rbx_member); // extract last argument
282 __ push(rax_temp); // re-push return address
283 generate_method_handle_dispatch(_masm, iid, rcx_recv, rbx_member, not_for_compiler_entry);
284 }
285
286 return entry_point;
287 }
288
289 void MethodHandles::generate_method_handle_dispatch(MacroAssembler* _masm,
290 vmIntrinsics::ID iid,
291 Register receiver_reg,
292 Register member_reg,
293 bool for_compiler_entry) {
294 assert(is_signature_polymorphic(iid), "expected invoke iid");
295 Register rbx_method = rbx; // eventual target of this invocation
296 // temps used in this code are not used in *either* compiled or interpreted calling sequences
297 #ifdef _LP64
298 Register temp1 = rscratch1;
299 Register temp2 = rscratch2;
300 Register temp3 = rax;
301 if (for_compiler_entry) {
302 assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : j_rarg0), "only valid assignment");
303 assert_different_registers(temp1, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5);
304 assert_different_registers(temp2, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5);
305 assert_different_registers(temp3, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5);
306 }
307 #else
308 Register temp1 = (for_compiler_entry ? rsi : rdx);
309 Register temp2 = rdi;
310 Register temp3 = rax;
311 if (for_compiler_entry) {
312 assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : rcx), "only valid assignment");
313 assert_different_registers(temp1, rcx, rdx);
314 assert_different_registers(temp2, rcx, rdx);
315 assert_different_registers(temp3, rcx, rdx);
316 }
317 #endif
318 else {
319 assert_different_registers(temp1, temp2, temp3, saved_last_sp_register()); // don't trash lastSP
320 }
321 assert_different_registers(temp1, temp2, temp3, receiver_reg);
322 assert_different_registers(temp1, temp2, temp3, member_reg);
323
324 if (iid == vmIntrinsics::_invokeBasic) {
325 // indirect through MH.form.vmentry.vmtarget
326 jump_to_lambda_form(_masm, receiver_reg, rbx_method, temp1, for_compiler_entry);
327
328 } else {
329 // The method is a member invoker used by direct method handles.
330 if (VerifyMethodHandles) {
331 // make sure the trailing argument really is a MemberName (caller responsibility)
332 verify_klass(_masm, member_reg, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_invoke_MemberName),
333 "MemberName required for invokeVirtual etc.");
334 }
335
336 Address member_clazz( member_reg, NONZERO(java_lang_invoke_MemberName::clazz_offset_in_bytes()));
337 Address member_vmindex( member_reg, NONZERO(java_lang_invoke_MemberName::vmindex_offset_in_bytes()));
338 Address member_vmtarget( member_reg, NONZERO(java_lang_invoke_MemberName::method_offset_in_bytes()));
339 Address vmtarget_method( rbx_method, NONZERO(java_lang_invoke_ResolvedMethodName::vmtarget_offset_in_bytes()));
340
341 Register temp1_recv_klass = temp1;
342 if (iid != vmIntrinsics::_linkToStatic) {
343 __ verify_oop(receiver_reg);
344 if (iid == vmIntrinsics::_linkToSpecial) {
345 // Don't actually load the klass; just null-check the receiver.
346 __ null_check(receiver_reg);
347 } else {
348 // load receiver klass itself
349 __ null_check(receiver_reg, oopDesc::klass_offset_in_bytes());
350 __ load_klass(temp1_recv_klass, receiver_reg);
351 __ verify_klass_ptr(temp1_recv_klass);
352 }
353 BLOCK_COMMENT("check_receiver {");
354 // The receiver for the MemberName must be in receiver_reg.
355 // Check the receiver against the MemberName.clazz
356 if (VerifyMethodHandles && iid == vmIntrinsics::_linkToSpecial) {
357 // Did not load it above...
358 __ load_klass(temp1_recv_klass, receiver_reg);
359 __ verify_klass_ptr(temp1_recv_klass);
360 }
361 if (VerifyMethodHandles && iid != vmIntrinsics::_linkToInterface) {
362 Label L_ok;
363 Register temp2_defc = temp2;
364 __ load_heap_oop(temp2_defc, member_clazz);
365 load_klass_from_Class(_masm, temp2_defc);
366 __ verify_klass_ptr(temp2_defc);
367 __ check_klass_subtype(temp1_recv_klass, temp2_defc, temp3, L_ok);
368 // If we get here, the type check failed!
369 __ STOP("receiver class disagrees with MemberName.clazz");
370 __ bind(L_ok);
371 }
372 BLOCK_COMMENT("} check_receiver");
373 }
374 if (iid == vmIntrinsics::_linkToSpecial ||
375 iid == vmIntrinsics::_linkToStatic) {
376 DEBUG_ONLY(temp1_recv_klass = noreg); // these guys didn't load the recv_klass
377 }
378
379 // Live registers at this point:
380 // member_reg - MemberName that was the trailing argument
381 // temp1_recv_klass - klass of stacked receiver, if needed
382 // rsi/r13 - interpreter linkage (if interpreted)
383 // rcx, rdx, rsi, rdi, r8 - compiler arguments (if compiled)
384
385 Label L_incompatible_class_change_error;
386 switch (iid) {
387 case vmIntrinsics::_linkToSpecial:
388 if (VerifyMethodHandles) {
389 verify_ref_kind(_masm, JVM_REF_invokeSpecial, member_reg, temp3);
390 }
391 __ load_heap_oop(rbx_method, member_vmtarget);
392 __ movptr(rbx_method, vmtarget_method);
393 break;
394
395 case vmIntrinsics::_linkToStatic:
396 if (VerifyMethodHandles) {
397 verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp3);
398 }
399 __ load_heap_oop(rbx_method, member_vmtarget);
400 __ movptr(rbx_method, vmtarget_method);
401 break;
402
403 case vmIntrinsics::_linkToVirtual:
404 {
405 // same as TemplateTable::invokevirtual,
406 // minus the CP setup and profiling:
407
408 if (VerifyMethodHandles) {
409 verify_ref_kind(_masm, JVM_REF_invokeVirtual, member_reg, temp3);
410 }
411
412 // pick out the vtable index from the MemberName, and then we can discard it:
413 Register temp2_index = temp2;
414 __ movptr(temp2_index, member_vmindex);
415
416 if (VerifyMethodHandles) {
417 Label L_index_ok;
418 __ cmpl(temp2_index, 0);
419 __ jcc(Assembler::greaterEqual, L_index_ok);
420 __ STOP("no virtual index");
421 __ BIND(L_index_ok);
422 }
423
424 // Note: The verifier invariants allow us to ignore MemberName.clazz and vmtarget
425 // at this point. And VerifyMethodHandles has already checked clazz, if needed.
426
427 // get target Method* & entry point
428 __ lookup_virtual_method(temp1_recv_klass, temp2_index, rbx_method);
429 break;
430 }
431
432 case vmIntrinsics::_linkToInterface:
433 {
434 // same as TemplateTable::invokeinterface
435 // (minus the CP setup and profiling, with different argument motion)
436 if (VerifyMethodHandles) {
437 verify_ref_kind(_masm, JVM_REF_invokeInterface, member_reg, temp3);
438 }
439
440 Register temp3_intf = temp3;
441 __ load_heap_oop(temp3_intf, member_clazz);
442 load_klass_from_Class(_masm, temp3_intf);
443 __ verify_klass_ptr(temp3_intf);
444
445 Register rbx_index = rbx_method;
446 __ movptr(rbx_index, member_vmindex);
447 if (VerifyMethodHandles) {
448 Label L;
449 __ cmpl(rbx_index, 0);
450 __ jcc(Assembler::greaterEqual, L);
451 __ STOP("invalid vtable index for MH.invokeInterface");
452 __ bind(L);
453 }
454
455 // given intf, index, and recv klass, dispatch to the implementation method
456 __ lookup_interface_method(temp1_recv_klass, temp3_intf,
457 // note: next two args must be the same:
458 rbx_index, rbx_method,
459 temp2,
460 L_incompatible_class_change_error);
461 break;
462 }
463
464 default:
465 fatal("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid));
466 break;
467 }
468
469 // Live at this point:
470 // rbx_method
471 // rsi/r13 (if interpreted)
472
473 // After figuring out which concrete method to call, jump into it.
474 // Note that this works in the interpreter with no data motion.
475 // But the compiled version will require that rcx_recv be shifted out.
476 __ verify_method_ptr(rbx_method);
477 jump_from_method_handle(_masm, rbx_method, temp1, for_compiler_entry);
478
479 if (iid == vmIntrinsics::_linkToInterface) {
480 __ bind(L_incompatible_class_change_error);
481 __ jump(RuntimeAddress(StubRoutines::throw_IncompatibleClassChangeError_entry()));
482 }
483 }
484 }
485
486 #ifndef PRODUCT
487 void trace_method_handle_stub(const char* adaptername,
488 oop mh,
489 intptr_t* saved_regs,
490 intptr_t* entry_sp) {
491 // called as a leaf from native code: do not block the JVM!
492 bool has_mh = (strstr(adaptername, "/static") == NULL &&
493 strstr(adaptername, "linkTo") == NULL); // static linkers don't have MH
494 const char* mh_reg_name = has_mh ? "rcx_mh" : "rcx";
495 tty->print_cr("MH %s %s=" PTR_FORMAT " sp=" PTR_FORMAT,
496 adaptername, mh_reg_name,
497 p2i(mh), p2i(entry_sp));
498
499 if (Verbose) {
500 tty->print_cr("Registers:");
501 const int saved_regs_count = RegisterImpl::number_of_registers;
502 for (int i = 0; i < saved_regs_count; i++) {
503 Register r = as_Register(i);
504 // The registers are stored in reverse order on the stack (by pusha).
505 tty->print("%3s=" PTR_FORMAT, r->name(), saved_regs[((saved_regs_count - 1) - i)]);
506 if ((i + 1) % 4 == 0) {
507 tty->cr();
508 } else {
509 tty->print(", ");
510 }
511 }
512 tty->cr();
513
514 {
515 // dumping last frame with frame::describe
516
517 JavaThread* p = JavaThread::active();
518
519 ResourceMark rm;
520 PRESERVE_EXCEPTION_MARK; // may not be needed by safer and unexpensive here
521 FrameValues values;
522
523 // Note: We want to allow trace_method_handle from any call site.
524 // While trace_method_handle creates a frame, it may be entered
525 // without a PC on the stack top (e.g. not just after a call).
526 // Walking that frame could lead to failures due to that invalid PC.
527 // => carefully detect that frame when doing the stack walking
528
529 // Current C frame
530 frame cur_frame = os::current_frame();
531
532 // Robust search of trace_calling_frame (independant of inlining).
533 // Assumes saved_regs comes from a pusha in the trace_calling_frame.
534 assert(cur_frame.sp() < saved_regs, "registers not saved on stack ?");
535 frame trace_calling_frame = os::get_sender_for_C_frame(&cur_frame);
536 while (trace_calling_frame.fp() < saved_regs) {
537 trace_calling_frame = os::get_sender_for_C_frame(&trace_calling_frame);
538 }
539
540 // safely create a frame and call frame::describe
541 intptr_t *dump_sp = trace_calling_frame.sender_sp();
542 intptr_t *dump_fp = trace_calling_frame.link();
543
544 bool walkable = has_mh; // whether the traced frame shoud be walkable
545
546 if (walkable) {
547 // The previous definition of walkable may have to be refined
548 // if new call sites cause the next frame constructor to start
549 // failing. Alternatively, frame constructors could be
550 // modified to support the current or future non walkable
551 // frames (but this is more intrusive and is not considered as
552 // part of this RFE, which will instead use a simpler output).
553 frame dump_frame = frame(dump_sp, dump_fp);
554 dump_frame.describe(values, 1);
555 } else {
556 // Stack may not be walkable (invalid PC above FP):
557 // Add descriptions without building a Java frame to avoid issues
558 values.describe(-1, dump_fp, "fp for #1 <not parsed, cannot trust pc>");
559 values.describe(-1, dump_sp, "sp for #1");
560 }
561 values.describe(-1, entry_sp, "raw top of stack");
562
563 tty->print_cr("Stack layout:");
564 values.print(p);
565 }
566 if (has_mh && oopDesc::is_oop(mh)) {
567 mh->print();
568 if (java_lang_invoke_MethodHandle::is_instance(mh)) {
569 if (java_lang_invoke_MethodHandle::form_offset_in_bytes() != 0)
570 java_lang_invoke_MethodHandle::form(mh)->print();
571 }
572 }
573 }
574 }
575
576 // The stub wraps the arguments in a struct on the stack to avoid
577 // dealing with the different calling conventions for passing 6
578 // arguments.
579 struct MethodHandleStubArguments {
580 const char* adaptername;
581 oopDesc* mh;
582 intptr_t* saved_regs;
583 intptr_t* entry_sp;
584 };
585 void trace_method_handle_stub_wrapper(MethodHandleStubArguments* args) {
586 trace_method_handle_stub(args->adaptername,
587 args->mh,
588 args->saved_regs,
589 args->entry_sp);
590 }
591
592 void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) {
593 if (!TraceMethodHandles) return;
594 BLOCK_COMMENT(err_msg("trace_method_handle %s {", adaptername));
595 __ enter();
596 __ andptr(rsp, -16); // align stack if needed for FPU state
597 __ pusha();
598 __ mov(rbx, rsp); // for retreiving saved_regs
599 // Note: saved_regs must be in the entered frame for the
600 // robust stack walking implemented in trace_method_handle_stub.
601
602 // save FP result, valid at some call sites (adapter_opt_return_float, ...)
603 __ increment(rsp, -2 * wordSize);
604 if (UseSSE >= 2) {
605 __ movdbl(Address(rsp, 0), xmm0);
606 } else if (UseSSE == 1) {
607 __ movflt(Address(rsp, 0), xmm0);
608 } else {
609 __ fst_d(Address(rsp, 0));
610 }
611
612 // Incoming state:
613 // rcx: method handle
614 //
615 // To avoid calling convention issues, build a record on the stack
616 // and pass the pointer to that instead.
617 __ push(rbp); // entry_sp (with extra align space)
618 __ push(rbx); // pusha saved_regs
619 __ push(rcx); // mh
620 __ push(rcx); // slot for adaptername
621 __ movptr(Address(rsp, 0), (intptr_t) adaptername);
622 __ super_call_VM_leaf(CAST_FROM_FN_PTR(address, trace_method_handle_stub_wrapper), rsp);
623 __ increment(rsp, sizeof(MethodHandleStubArguments));
624
625 if (UseSSE >= 2) {
626 __ movdbl(xmm0, Address(rsp, 0));
627 } else if (UseSSE == 1) {
628 __ movflt(xmm0, Address(rsp, 0));
629 } else {
630 __ fld_d(Address(rsp, 0));
631 }
632 __ increment(rsp, 2 * wordSize);
633
634 __ popa();
635 __ leave();
636 BLOCK_COMMENT("} trace_method_handle");
637 }
638 #endif //PRODUCT