1 /*
2 * Copyright (c) 2008, 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 // This file mirror as much as possible methodHandles_x86.cpp to ease
26 // cross platform development for JSR292.
27 // Last synchronization: changeset f8c9417e3571
28
29 #include "precompiled.hpp"
30 #include "jvm.h"
31 #include "classfile/javaClasses.inline.hpp"
32 #include "interpreter/interpreter.hpp"
33 #include "interpreter/interpreterRuntime.hpp"
34 #include "memory/allocation.inline.hpp"
35 #include "memory/resourceArea.hpp"
36 #include "prims/methodHandles.hpp"
37 #include "runtime/frame.inline.hpp"
38 #include "utilities/preserveException.hpp"
39
40 #define __ _masm->
41
42 #ifdef PRODUCT
43 #define BLOCK_COMMENT(str) /* nothing */
44 #else
45 #define BLOCK_COMMENT(str) __ block_comment(str)
46 #endif
47
48 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":")
49
50 void MethodHandles::load_klass_from_Class(MacroAssembler* _masm, Register klass_reg, Register temp1, Register temp2) {
51 if (VerifyMethodHandles) {
52 verify_klass(_masm, klass_reg, temp1, temp2, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_Class),
53 "MH argument is a Class");
54 }
55 __ ldr(klass_reg, Address(klass_reg, java_lang_Class::klass_offset_in_bytes()));
56 }
57
58 #ifdef ASSERT
59 static int check_nonzero(const char* xname, int x) {
60 assert(x != 0, "%s should be nonzero", xname);
61 return x;
62 }
63 #define NONZERO(x) check_nonzero(#x, x)
64 #else //ASSERT
65 #define NONZERO(x) (x)
66 #endif //ASSERT
67
68 #ifdef ASSERT
69 void MethodHandles::verify_klass(MacroAssembler* _masm,
70 Register obj, Register temp1, Register temp2, SystemDictionary::WKID klass_id,
71 const char* error_message) {
72 InstanceKlass** klass_addr = SystemDictionary::well_known_klass_addr(klass_id);
73 Klass* klass = SystemDictionary::well_known_klass(klass_id);
74 Label L_ok, L_bad;
75 BLOCK_COMMENT("verify_klass {");
76 __ verify_oop(obj);
77 __ cbz(obj, L_bad);
78 __ load_klass(temp1, obj);
79 __ lea(temp2, ExternalAddress((address) klass_addr));
80 __ ldr(temp2, temp2); // the cmpptr on x86 dereferences the AddressLiteral (not lea)
81 __ cmp(temp1, temp2);
82 __ b(L_ok, eq);
83 intptr_t super_check_offset = klass->super_check_offset();
84 __ ldr(temp1, Address(temp1, super_check_offset));
85 __ cmp(temp1, temp2);
86 __ b(L_ok, eq);
87
88 __ bind(L_bad);
89 __ stop(error_message);
90 __ BIND(L_ok);
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 __ ldr_u32(temp, Address(member_reg, NONZERO(java_lang_invoke_MemberName::flags_offset_in_bytes())));
98 __ logical_shift_right(temp, temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT);
99 __ andr(temp, temp, (unsigned)java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK);
100 __ cmp(temp, ref_kind);
101 __ b(L, eq);
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, bool for_compiler_entry) {
117 Label L_no_such_method;
118 __ cbz(Rmethod, L_no_such_method);
119
120 // Note: JVMTI overhead seems small enough compared to invocation
121 // cost and is not worth the complexity or code size overhead of
122 // supporting several variants of each adapter.
123 if (!for_compiler_entry && (JvmtiExport::can_post_interpreter_events())) {
124 // JVMTI events, such as single-stepping, are implemented partly by avoiding running
125 // compiled code in threads for which the event is enabled. Check here for
126 // interp_only_mode if these events CAN be enabled.
127 __ ldr_s32(Rtemp, Address(Rthread, JavaThread::interp_only_mode_offset()));
128 __ cmp(Rtemp, 0);
129 __ ldr(PC, Address(Rmethod, Method::interpreter_entry_offset()), ne);
130 }
131 const ByteSize entry_offset = for_compiler_entry ? Method::from_compiled_offset() :
132 Method::from_interpreted_offset();
133
134 __ indirect_jump(Address(Rmethod, entry_offset), Rtemp);
135
136 __ bind(L_no_such_method);
137 // throw exception
138 __ jump(StubRoutines::throw_AbstractMethodError_entry(), relocInfo::runtime_call_type, Rtemp);
139 }
140
141 void MethodHandles::jump_to_lambda_form(MacroAssembler* _masm,
142 Register recv, Register tmp,
143 bool for_compiler_entry) {
144 BLOCK_COMMENT("jump_to_lambda_form {");
145 // This is the initial entry point of a lazy method handle.
146 // After type checking, it picks up the invoker from the LambdaForm.
147 assert_different_registers(recv, tmp, Rmethod);
148
149 // Load the invoker, as MH -> MH.form -> LF.vmentry
150 __ load_heap_oop(tmp, Address(recv, NONZERO(java_lang_invoke_MethodHandle::form_offset_in_bytes())));
151 __ verify_oop(tmp);
152
153 __ load_heap_oop(tmp, Address(tmp, NONZERO(java_lang_invoke_LambdaForm::vmentry_offset_in_bytes())));
154 __ verify_oop(tmp);
155
156 __ load_heap_oop(Rmethod, Address(tmp, NONZERO(java_lang_invoke_MemberName::method_offset_in_bytes())));
157 __ verify_oop(Rmethod);
158 __ access_load_at(T_ADDRESS, IN_HEAP, Address(Rmethod, NONZERO(java_lang_invoke_ResolvedMethodName::vmtarget_offset_in_bytes())), Rmethod, noreg, noreg, noreg);
159
160 if (VerifyMethodHandles && !for_compiler_entry) {
161 // make sure recv is already on stack
162 __ ldr(tmp, Address(Rmethod, Method::const_offset()));
163 __ load_sized_value(tmp,
164 Address(tmp, ConstMethod::size_of_parameters_offset()),
165 sizeof(u2), /*is_signed*/ false);
166 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), "");
167 Label L;
168 __ ldr(tmp, __ receiver_argument_address(Rparams, tmp, tmp));
169 __ cmp(tmp, recv);
170 __ b(L, eq);
171 __ stop("receiver not on stack");
172 __ bind(L);
173 }
174
175 jump_from_method_handle(_masm, for_compiler_entry);
176 BLOCK_COMMENT("} jump_to_lambda_form");
177 }
178
179
180 // Code generation
181 address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* _masm,
182 vmIntrinsics::ID iid) {
183 const bool not_for_compiler_entry = false; // this is the interpreter entry
184 assert(is_signature_polymorphic(iid), "expected invoke iid");
185 if (iid == vmIntrinsics::_invokeGeneric ||
186 iid == vmIntrinsics::_compiledLambdaForm) {
187 // Perhaps surprisingly, the user-visible names, and linkToCallSite, are not directly used.
188 // They are linked to Java-generated adapters via MethodHandleNatives.linkMethod.
189 // They all require an extra argument.
190 __ should_not_reach_here(); // empty stubs make SG sick
191 return NULL;
192 }
193
194 // Rmethod: Method*
195 // Rparams (SP on 32-bit ARM): pointer to parameters
196 // Rsender_sp (R4/R19): sender SP (must preserve; see prepare_to_jump_from_interpreted)
197 // R5_mh: receiver method handle (must load from sp[MethodTypeForm.vmslots])
198 // R1, R2, Rtemp: garbage temp, blown away
199
200 // Use same name as x86 to ease future merges
201 Register rdx_temp = R2_tmp;
202 Register rdx_param_size = rdx_temp; // size of parameters
203 Register rax_temp = R1_tmp;
204 Register rcx_mh = R5_mh; // MH receiver; dies quickly and is recycled
205 Register rbx_method = Rmethod; // eventual target of this invocation
206 Register rdi_temp = Rtemp;
207
208 // here's where control starts out:
209 __ align(CodeEntryAlignment);
210 address entry_point = __ pc();
211
212 if (VerifyMethodHandles) {
213 Label L;
214 BLOCK_COMMENT("verify_intrinsic_id {");
215 __ ldrh(rdi_temp, Address(rbx_method, Method::intrinsic_id_offset_in_bytes()));
216 __ sub_slow(rdi_temp, rdi_temp, (int) iid);
217 __ cbz(rdi_temp, L);
218 if (iid == vmIntrinsics::_linkToVirtual ||
219 iid == vmIntrinsics::_linkToSpecial) {
220 // could do this for all kinds, but would explode assembly code size
221 trace_method_handle(_masm, "bad Method*::intrinsic_id");
222 }
223 __ stop("bad Method*::intrinsic_id");
224 __ bind(L);
225 BLOCK_COMMENT("} verify_intrinsic_id");
226 }
227
228 // First task: Find out how big the argument list is.
229 Address rdx_first_arg_addr;
230 int ref_kind = signature_polymorphic_intrinsic_ref_kind(iid);
231 assert(ref_kind != 0 || iid == vmIntrinsics::_invokeBasic, "must be _invokeBasic or a linkTo intrinsic");
232 if (ref_kind == 0 || MethodHandles::ref_kind_has_receiver(ref_kind)) {
233 __ ldr(rdx_param_size, Address(rbx_method, Method::const_offset()));
234 __ load_sized_value(rdx_param_size,
235 Address(rdx_param_size, ConstMethod::size_of_parameters_offset()),
236 sizeof(u2), /*is_signed*/ false);
237 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), "");
238 rdx_first_arg_addr = __ receiver_argument_address(Rparams, rdx_param_size, rdi_temp);
239 } else {
240 DEBUG_ONLY(rdx_param_size = noreg);
241 }
242
243 if (!is_signature_polymorphic_static(iid)) {
244 __ ldr(rcx_mh, rdx_first_arg_addr);
245 DEBUG_ONLY(rdx_param_size = noreg);
246 }
247
248 // rdx_first_arg_addr is live!
249
250 trace_method_handle_interpreter_entry(_masm, iid);
251
252 if (iid == vmIntrinsics::_invokeBasic) {
253 generate_method_handle_dispatch(_masm, iid, rcx_mh, noreg, not_for_compiler_entry);
254
255 } else {
256 // Adjust argument list by popping the trailing MemberName argument.
257 Register rcx_recv = noreg;
258 if (MethodHandles::ref_kind_has_receiver(ref_kind)) {
259 // Load the receiver (not the MH; the actual MemberName's receiver) up from the interpreter stack.
260 __ ldr(rcx_recv = rcx_mh, rdx_first_arg_addr);
261 DEBUG_ONLY(rdx_param_size = noreg);
262 }
263 Register rbx_member = rbx_method; // MemberName ptr; incoming method ptr is dead now
264 __ pop(rbx_member);
265 generate_method_handle_dispatch(_masm, iid, rcx_recv, rbx_member, not_for_compiler_entry);
266 }
267 return entry_point;
268 }
269
270 void MethodHandles::generate_method_handle_dispatch(MacroAssembler* _masm,
271 vmIntrinsics::ID iid,
272 Register receiver_reg,
273 Register member_reg,
274 bool for_compiler_entry) {
275 assert(is_signature_polymorphic(iid), "expected invoke iid");
276 // Use same name as x86 to ease future merges
277 Register rbx_method = Rmethod; // eventual target of this invocation
278 // temps used in this code are not used in *either* compiled or interpreted calling sequences
279 Register temp1 = (for_compiler_entry ? saved_last_sp_register() : R1_tmp);
280 Register temp2 = R8;
281 Register temp3 = Rtemp; // R12/R16
282 Register temp4 = R5;
283 if (for_compiler_entry) {
284 assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : j_rarg0), "only valid assignment");
285 assert_different_registers(temp1, j_rarg0, j_rarg1, j_rarg2, j_rarg3);
286 assert_different_registers(temp2, j_rarg0, j_rarg1, j_rarg2, j_rarg3);
287 assert_different_registers(temp3, j_rarg0, j_rarg1, j_rarg2, j_rarg3);
288 assert_different_registers(temp4, j_rarg0, j_rarg1, j_rarg2, j_rarg3);
289 }
290 assert_different_registers(temp1, temp2, temp3, receiver_reg);
291 assert_different_registers(temp1, temp2, temp3, temp4, member_reg);
292 if (!for_compiler_entry)
293 assert_different_registers(temp1, temp2, temp3, temp4, saved_last_sp_register()); // don't trash lastSP
294
295 if (iid == vmIntrinsics::_invokeBasic) {
296 // indirect through MH.form.exactInvoker.vmtarget
297 jump_to_lambda_form(_masm, receiver_reg, temp3, for_compiler_entry);
298
299 } else {
300 // The method is a member invoker used by direct method handles.
301 if (VerifyMethodHandles) {
302 // make sure the trailing argument really is a MemberName (caller responsibility)
303 verify_klass(_masm, member_reg, temp2, temp3, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_invoke_MemberName),
304 "MemberName required for invokeVirtual etc.");
305 }
306
307 Address member_clazz( member_reg, NONZERO(java_lang_invoke_MemberName::clazz_offset_in_bytes()));
308 Address member_vmindex( member_reg, NONZERO(java_lang_invoke_MemberName::vmindex_offset_in_bytes()));
309 Address member_vmtarget(member_reg, NONZERO(java_lang_invoke_MemberName::method_offset_in_bytes()));
310 Address vmtarget_method(Rmethod, NONZERO(java_lang_invoke_ResolvedMethodName::vmtarget_offset_in_bytes()));
311
312 Register temp1_recv_klass = temp1;
313 if (iid != vmIntrinsics::_linkToStatic) {
314 if (iid == vmIntrinsics::_linkToSpecial) {
315 // Don't actually load the klass; just null-check the receiver.
316 __ null_check(receiver_reg, temp3);
317 } else {
318 // load receiver klass itself
319 __ null_check(receiver_reg, temp3, oopDesc::klass_offset_in_bytes());
320 __ load_klass(temp1_recv_klass, receiver_reg);
321 __ verify_klass_ptr(temp1_recv_klass);
322 }
323 BLOCK_COMMENT("check_receiver {");
324 // The receiver for the MemberName must be in receiver_reg.
325 // Check the receiver against the MemberName.clazz
326 if (VerifyMethodHandles && iid == vmIntrinsics::_linkToSpecial) {
327 // Did not load it above...
328 __ load_klass(temp1_recv_klass, receiver_reg);
329 __ verify_klass_ptr(temp1_recv_klass);
330 }
331 // Check the receiver against the MemberName.clazz
332 if (VerifyMethodHandles && iid != vmIntrinsics::_linkToInterface) {
333 Label L_ok;
334 Register temp2_defc = temp2;
335 __ load_heap_oop(temp2_defc, member_clazz);
336 load_klass_from_Class(_masm, temp2_defc, temp3, temp4);
337 __ verify_klass_ptr(temp2_defc);
338 __ check_klass_subtype(temp1_recv_klass, temp2_defc, temp3, temp4, noreg, L_ok);
339 // If we get here, the type check failed!
340 __ stop("receiver class disagrees with MemberName.clazz");
341 __ bind(L_ok);
342 }
343 BLOCK_COMMENT("} check_receiver");
344 }
345 if (iid == vmIntrinsics::_linkToSpecial ||
346 iid == vmIntrinsics::_linkToStatic) {
347 DEBUG_ONLY(temp1_recv_klass = noreg); // these guys didn't load the recv_klass
348 }
349
350 // Live registers at this point:
351 // member_reg - MemberName that was the extra argument
352 // temp1_recv_klass - klass of stacked receiver, if needed
353
354 Label L_incompatible_class_change_error;
355 switch (iid) {
356 case vmIntrinsics::_linkToSpecial:
357 if (VerifyMethodHandles) {
358 verify_ref_kind(_masm, JVM_REF_invokeSpecial, member_reg, temp3);
359 }
360 __ load_heap_oop(Rmethod, member_vmtarget);
361 __ access_load_at(T_ADDRESS, IN_HEAP, vmtarget_method, Rmethod, noreg, noreg, noreg);
362 break;
363
364 case vmIntrinsics::_linkToStatic:
365 if (VerifyMethodHandles) {
366 verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp3);
367 }
368 __ load_heap_oop(Rmethod, member_vmtarget);
369 __ access_load_at(T_ADDRESS, IN_HEAP, vmtarget_method, Rmethod, noreg, noreg, noreg);
370 break;
371 break;
372
373 case vmIntrinsics::_linkToVirtual:
374 {
375 // same as TemplateTable::invokevirtual,
376 // minus the CP setup and profiling:
377
378 if (VerifyMethodHandles) {
379 verify_ref_kind(_masm, JVM_REF_invokeVirtual, member_reg, temp3);
380 }
381
382 // pick out the vtable index from the MemberName, and then we can discard it:
383 Register temp2_index = temp2;
384 __ access_load_at(T_ADDRESS, IN_HEAP, member_vmindex, temp2_index, noreg, noreg, noreg);
385
386 if (VerifyMethodHandles) {
387 Label L_index_ok;
388 __ cmp(temp2_index, 0);
389 __ b(L_index_ok, ge);
390 __ stop("no virtual index");
391 __ bind(L_index_ok);
392 }
393
394 // Note: The verifier invariants allow us to ignore MemberName.clazz and vmtarget
395 // at this point. And VerifyMethodHandles has already checked clazz, if needed.
396
397 // get target Method* & entry point
398 __ lookup_virtual_method(temp1_recv_klass, temp2_index, Rmethod);
399 break;
400 }
401
402 case vmIntrinsics::_linkToInterface:
403 {
404 // same as TemplateTable::invokeinterface
405 // (minus the CP setup and profiling, with different argument motion)
406 if (VerifyMethodHandles) {
407 verify_ref_kind(_masm, JVM_REF_invokeInterface, member_reg, temp3);
408 }
409
410 Register temp3_intf = temp3;
411 __ load_heap_oop(temp3_intf, member_clazz);
412 load_klass_from_Class(_masm, temp3_intf, temp2, temp4);
413 __ verify_klass_ptr(temp3_intf);
414
415 Register rbx_index = rbx_method;
416 __ access_load_at(T_ADDRESS, IN_HEAP, member_vmindex, rbx_index, noreg, noreg, noreg);
417 if (VerifyMethodHandles) {
418 Label L;
419 __ cmp(rbx_index, 0);
420 __ b(L, ge);
421 __ stop("invalid vtable index for MH.invokeInterface");
422 __ bind(L);
423 }
424
425 // given intf, index, and recv klass, dispatch to the implementation method
426 __ lookup_interface_method(temp1_recv_klass, temp3_intf,
427 // note: next two args must be the same:
428 rbx_index, rbx_method,
429 temp2, temp4,
430 L_incompatible_class_change_error);
431 break;
432 }
433
434 default:
435 fatal("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid));
436 break;
437 }
438
439 // Live at this point:
440 // Rmethod (target method)
441 // Rsender_sp, Rparams (if interpreted)
442 // register arguments (if compiled)
443
444 // After figuring out which concrete method to call, jump into it.
445 __ verify_method_ptr(Rmethod);
446 jump_from_method_handle(_masm, for_compiler_entry);
447
448 if (iid == vmIntrinsics::_linkToInterface) {
449 __ bind(L_incompatible_class_change_error);
450 __ jump(StubRoutines::throw_IncompatibleClassChangeError_entry(), relocInfo::runtime_call_type, Rtemp);
451 }
452 }
453 }
454
455
456 #ifndef PRODUCT
457 enum {
458 ARG_LIMIT = 255, SLOP = 4,
459 // use this parameter for checking for garbage stack movements:
460 UNREASONABLE_STACK_MOVE = (ARG_LIMIT + SLOP)
461 // the slop defends against false alarms due to fencepost errors
462 };
463
464 const int trace_mh_nregs = 15;
465 const Register trace_mh_regs[trace_mh_nregs] =
466 {R0, R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, LR, PC};
467
468 void trace_method_handle_stub(const char* adaptername,
469 intptr_t* saved_regs,
470 intptr_t* saved_bp,
471 oop mh) {
472 // called as a leaf from native code: do not block the JVM!
473 bool has_mh = (strstr(adaptername, "/static") == NULL &&
474 strstr(adaptername, "linkTo") == NULL); // static linkers don't have MH
475 intptr_t* entry_sp = (intptr_t*) &saved_regs[trace_mh_nregs]; // just after the saved regs
476 intptr_t* saved_sp = (intptr_t*) saved_regs[Rsender_sp->encoding()]; // save of Rsender_sp
477 intptr_t* last_sp = (intptr_t*) saved_bp[frame::interpreter_frame_last_sp_offset];
478 intptr_t* base_sp = last_sp;
479
480 intptr_t mh_reg = (intptr_t)saved_regs[R5_mh->encoding()];
481 const char* mh_reg_name = "R5_mh";
482 if (!has_mh) mh_reg_name = "R5";
483 tty->print_cr("MH %s %s=" PTR_FORMAT " sp=(" PTR_FORMAT "+" INTX_FORMAT ") stack_size=" INTX_FORMAT " bp=" PTR_FORMAT,
484 adaptername, mh_reg_name, mh_reg,
485 (intptr_t)entry_sp, (intptr_t)saved_sp - (intptr_t)entry_sp, (intptr_t)(base_sp - last_sp), (intptr_t)saved_bp);
486
487 if (last_sp != saved_sp && last_sp != NULL)
488 tty->print_cr("*** last_sp=" INTPTR_FORMAT, p2i(last_sp));
489 if (Verbose) {
490 tty->print(" reg dump: ");
491 int i;
492 for (i = 0; i < trace_mh_nregs; i++) {
493 if (i > 0 && i % 4 == 0)
494 tty->print("\n + dump: ");
495 const char* reg_name = trace_mh_regs[i]->name();
496 tty->print(" %s: " INTPTR_FORMAT, reg_name, p2i((void *)saved_regs[i]));
497 }
498 tty->cr();
499 }
500
501 if (Verbose) {
502 // dump last frame (from JavaThread::print_frame_layout)
503
504 // Note: code is robust but the dumped informationm may not be
505 // 100% correct, particularly with respect to the dumped
506 // "unextended_sp". Getting it right for all trace_method_handle
507 // call paths is not worth the complexity/risk. The correct slot
508 // will be identified by *Rsender_sp anyway in the dump.
509 JavaThread* p = JavaThread::active();
510
511 ResourceMark rm;
512 PRESERVE_EXCEPTION_MARK;
513 FrameValues values;
514
515 intptr_t* dump_fp = (intptr_t *) saved_bp;
516 address dump_pc = (address) saved_regs[trace_mh_nregs-2]; // LR (with LR,PC last in saved_regs)
517 frame dump_frame((intptr_t *)entry_sp, dump_fp, dump_pc);
518
519 dump_frame.describe(values, 1);
520 // mark Rsender_sp if seems valid
521 if (has_mh) {
522 if ((saved_sp >= entry_sp - UNREASONABLE_STACK_MOVE) && (saved_sp < dump_fp)) {
523 values.describe(-1, saved_sp, "*Rsender_sp");
524 }
525 }
526
527 // Note: the unextended_sp may not be correct
528 tty->print_cr(" stack layout:");
529 values.print(p);
530 }
531 if (Verbose) {
532 if (has_mh && oopDesc::is_oop(mh)) {
533 mh->print();
534 if (java_lang_invoke_MethodHandle::is_instance(mh)) {
535 if (java_lang_invoke_MethodHandle::form_offset_in_bytes() != 0)
536 java_lang_invoke_MethodHandle::form(mh)->print();
537 }
538 }
539 }
540 }
541
542 void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) {
543 if (!TraceMethodHandles) return;
544 BLOCK_COMMENT("trace_method_handle {");
545 // register saving
546 // must correspond to trace_mh_nregs and trace_mh_regs defined above
547 int push_size = __ save_all_registers();
548 assert(trace_mh_nregs*wordSize == push_size,"saved register count mismatch");
549
550 __ mov_slow(R0, adaptername);
551 __ mov(R1, SP); // entry_sp (after pushes)
552 __ mov(R2, FP);
553 if (R5_mh != R3) {
554 assert_different_registers(R0, R1, R2, R5_mh);
555 __ mov(R3, R5_mh);
556 }
557
558 __ call_VM_leaf(CAST_FROM_FN_PTR(address, trace_method_handle_stub), R0, R1, R2, R3);
559
560 __ restore_all_registers();
561 BLOCK_COMMENT("} trace_method_handle");
562 }
563 #endif //PRODUCT