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