1 /*
2 * Copyright (c) 2008, 2017, 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 "classfile/javaClasses.inline.hpp"
31 #include "interpreter/interpreter.hpp"
32 #include "interpreter/interpreterRuntime.hpp"
33 #include "memory/allocation.inline.hpp"
34 #include "memory/resourceArea.hpp"
35 #include "prims/jvm.h"
36 #include "prims/methodHandles.hpp"
37
38 #define __ _masm->
39
40 #ifdef PRODUCT
41 #define BLOCK_COMMENT(str) /* nothing */
42 #else
43 #define BLOCK_COMMENT(str) __ block_comment(str)
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, Register temp1, Register temp2) {
49 if (VerifyMethodHandles) {
50 verify_klass(_masm, klass_reg, temp1, temp2, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_Class),
51 "MH argument is a Class");
52 }
53 __ ldr(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, Register temp1, Register temp2, 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 Label L_ok, L_bad;
73 BLOCK_COMMENT("verify_klass {");
74 __ verify_oop(obj);
75 __ cbz(obj, L_bad);
76 __ load_klass(temp1, obj);
77 __ lea(temp2, ExternalAddress((address) klass_addr));
78 __ ldr(temp2, temp2); // the cmpptr on x86 dereferences the AddressLiteral (not lea)
79 __ cmp(temp1, temp2);
80 __ b(L_ok, eq);
81 intptr_t super_check_offset = klass->super_check_offset();
82 __ ldr(temp1, Address(temp1, super_check_offset));
83 __ cmp(temp1, temp2);
84 __ b(L_ok, eq);
85
86 __ bind(L_bad);
87 __ stop(error_message);
88 __ BIND(L_ok);
89 BLOCK_COMMENT("} verify_klass");
90 }
91
92 void MethodHandles::verify_ref_kind(MacroAssembler* _masm, int ref_kind, Register member_reg, Register temp) {
93 Label L;
94 BLOCK_COMMENT("verify_ref_kind {");
95 __ ldr_u32(temp, Address(member_reg, NONZERO(java_lang_invoke_MemberName::flags_offset_in_bytes())));
96 __ logical_shift_right(temp, temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT);
97 __ andr(temp, temp, (unsigned)java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK);
98 __ cmp(temp, ref_kind);
99 __ b(L, eq);
100 { char* buf = NEW_C_HEAP_ARRAY(char, 100, mtInternal);
101 jio_snprintf(buf, 100, "verify_ref_kind expected %x", ref_kind);
102 if (ref_kind == JVM_REF_invokeVirtual ||
103 ref_kind == JVM_REF_invokeSpecial)
104 // could do this for all ref_kinds, but would explode assembly code size
105 trace_method_handle(_masm, buf);
106 __ stop(buf);
107 }
108 BLOCK_COMMENT("} verify_ref_kind");
109 __ bind(L);
110 }
111
112 #endif //ASSERT
113
114 void MethodHandles::jump_from_method_handle(MacroAssembler* _masm, bool for_compiler_entry) {
115 Label L_no_such_method;
116 __ cbz(Rmethod, L_no_such_method);
117
118 // Note: JVMTI overhead seems small enough compared to invocation
119 // cost and is not worth the complexity or code size overhead of
120 // supporting several variants of each adapter.
121 if (!for_compiler_entry && (JvmtiExport::can_post_interpreter_events())) {
122 // JVMTI events, such as single-stepping, are implemented partly by avoiding running
123 // compiled code in threads for which the event is enabled. Check here for
124 // interp_only_mode if these events CAN be enabled.
125 __ ldr_s32(Rtemp, Address(Rthread, JavaThread::interp_only_mode_offset()));
126 #ifdef AARCH64
127 Label L;
128 __ cbz(Rtemp, L);
129 __ indirect_jump(Address(Rmethod, Method::interpreter_entry_offset()), Rtemp);
130 __ bind(L);
131 #else
132 __ cmp(Rtemp, 0);
133 __ ldr(PC, Address(Rmethod, Method::interpreter_entry_offset()), ne);
134 #endif // AARCH64
135 }
136 const ByteSize entry_offset = for_compiler_entry ? Method::from_compiled_offset() :
137 Method::from_interpreted_offset();
138
139 __ indirect_jump(Address(Rmethod, entry_offset), Rtemp);
140
141 __ bind(L_no_such_method);
142 // throw exception
143 __ jump(StubRoutines::throw_AbstractMethodError_entry(), relocInfo::runtime_call_type, Rtemp);
144 }
145
146 void MethodHandles::jump_to_lambda_form(MacroAssembler* _masm,
147 Register recv, Register tmp,
148 bool for_compiler_entry) {
149 BLOCK_COMMENT("jump_to_lambda_form {");
150 // This is the initial entry point of a lazy method handle.
151 // After type checking, it picks up the invoker from the LambdaForm.
152 assert_different_registers(recv, tmp, Rmethod);
153
154 // Load the invoker, as MH -> MH.form -> LF.vmentry
155 __ load_heap_oop(tmp, Address(recv, NONZERO(java_lang_invoke_MethodHandle::form_offset_in_bytes())));
156 __ verify_oop(tmp);
157
158 __ load_heap_oop(tmp, Address(tmp, NONZERO(java_lang_invoke_LambdaForm::vmentry_offset_in_bytes())));
159 __ verify_oop(tmp);
160
161 __ load_heap_oop(Rmethod, Address(tmp, NONZERO(java_lang_invoke_MemberName::method_offset_in_bytes())));
162 __ verify_oop(Rmethod);
163 __ ldr(Rmethod, Address(Rmethod, NONZERO(java_lang_invoke_ResolvedMethodName::vmtarget_offset_in_bytes())));
164
165 if (VerifyMethodHandles && !for_compiler_entry) {
166 // make sure recv is already on stack
167 __ ldr(tmp, Address(Rmethod, Method::const_offset()));
168 __ load_sized_value(tmp,
169 Address(tmp, ConstMethod::size_of_parameters_offset()),
170 sizeof(u2), /*is_signed*/ false);
171 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), "");
172 Label L;
173 __ ldr(tmp, __ receiver_argument_address(Rparams, tmp, tmp));
174 __ cmp(tmp, recv);
175 __ b(L, eq);
176 __ stop("receiver not on stack");
177 __ bind(L);
178 }
179
180 jump_from_method_handle(_masm, for_compiler_entry);
181 BLOCK_COMMENT("} jump_to_lambda_form");
182 }
183
184
185 // Code generation
186 address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* _masm,
187 vmIntrinsics::ID iid) {
188 const bool not_for_compiler_entry = false; // this is the interpreter entry
189 assert(is_signature_polymorphic(iid), "expected invoke iid");
190 if (iid == vmIntrinsics::_invokeGeneric ||
191 iid == vmIntrinsics::_compiledLambdaForm) {
192 // Perhaps surprisingly, the user-visible names, and linkToCallSite, are not directly used.
193 // They are linked to Java-generated adapters via MethodHandleNatives.linkMethod.
194 // They all require an extra argument.
195 __ should_not_reach_here(); // empty stubs make SG sick
196 return NULL;
197 }
198
199 // Rmethod: Method*
200 // Rparams (SP on 32-bit ARM): pointer to parameters
201 // Rsender_sp (R4/R19): sender SP (must preserve; see prepare_to_jump_from_interpreted)
202 // R5_mh: receiver method handle (must load from sp[MethodTypeForm.vmslots])
203 // R1, R2, Rtemp: garbage temp, blown away
204
205 // Use same name as x86 to ease future merges
206 Register rdx_temp = R2_tmp;
207 Register rdx_param_size = rdx_temp; // size of parameters
208 Register rax_temp = R1_tmp;
209 Register rcx_mh = R5_mh; // MH receiver; dies quickly and is recycled
210 Register rbx_method = Rmethod; // eventual target of this invocation
211 Register rdi_temp = Rtemp;
212
213 // here's where control starts out:
214 __ align(CodeEntryAlignment);
215 address entry_point = __ pc();
216
217 if (VerifyMethodHandles) {
218 Label L;
219 BLOCK_COMMENT("verify_intrinsic_id {");
220 __ ldrh(rdi_temp, Address(rbx_method, Method::intrinsic_id_offset_in_bytes()));
221 __ sub_slow(rdi_temp, rdi_temp, (int) iid);
222 __ cbz(rdi_temp, L);
223 if (iid == vmIntrinsics::_linkToVirtual ||
224 iid == vmIntrinsics::_linkToSpecial) {
225 // could do this for all kinds, but would explode assembly code size
226 trace_method_handle(_masm, "bad Method*::intrinsic_id");
227 }
228 __ stop("bad Method*::intrinsic_id");
229 __ bind(L);
230 BLOCK_COMMENT("} verify_intrinsic_id");
231 }
232
233 // First task: Find out how big the argument list is.
234 Address rdx_first_arg_addr;
235 int ref_kind = signature_polymorphic_intrinsic_ref_kind(iid);
236 assert(ref_kind != 0 || iid == vmIntrinsics::_invokeBasic, "must be _invokeBasic or a linkTo intrinsic");
237 if (ref_kind == 0 || MethodHandles::ref_kind_has_receiver(ref_kind)) {
238 __ ldr(rdx_param_size, Address(rbx_method, Method::const_offset()));
239 __ load_sized_value(rdx_param_size,
240 Address(rdx_param_size, ConstMethod::size_of_parameters_offset()),
241 sizeof(u2), /*is_signed*/ false);
242 // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), "");
243 rdx_first_arg_addr = __ receiver_argument_address(Rparams, rdx_param_size, rdi_temp);
244 } else {
245 DEBUG_ONLY(rdx_param_size = noreg);
246 }
247
248 if (!is_signature_polymorphic_static(iid)) {
249 __ ldr(rcx_mh, rdx_first_arg_addr);
250 DEBUG_ONLY(rdx_param_size = noreg);
251 }
252
253 // rdx_first_arg_addr is live!
254
255 trace_method_handle_interpreter_entry(_masm, iid);
256
257 if (iid == vmIntrinsics::_invokeBasic) {
258 generate_method_handle_dispatch(_masm, iid, rcx_mh, noreg, not_for_compiler_entry);
259
260 } else {
261 // Adjust argument list by popping the trailing MemberName argument.
262 Register rcx_recv = noreg;
263 if (MethodHandles::ref_kind_has_receiver(ref_kind)) {
264 // Load the receiver (not the MH; the actual MemberName's receiver) up from the interpreter stack.
265 __ ldr(rcx_recv = rcx_mh, rdx_first_arg_addr);
266 DEBUG_ONLY(rdx_param_size = noreg);
267 }
268 Register rbx_member = rbx_method; // MemberName ptr; incoming method ptr is dead now
269 #ifdef AARCH64
270 __ ldr(rbx_member, Address(Rparams, Interpreter::stackElementSize, post_indexed));
271 #else
272 __ pop(rbx_member);
273 #endif
274 generate_method_handle_dispatch(_masm, iid, rcx_recv, rbx_member, not_for_compiler_entry);
275 }
276 return entry_point;
277 }
278
279 void MethodHandles::generate_method_handle_dispatch(MacroAssembler* _masm,
280 vmIntrinsics::ID iid,
281 Register receiver_reg,
282 Register member_reg,
283 bool for_compiler_entry) {
284 assert(is_signature_polymorphic(iid), "expected invoke iid");
285 // Use same name as x86 to ease future merges
286 Register rbx_method = Rmethod; // eventual target of this invocation
287 // temps used in this code are not used in *either* compiled or interpreted calling sequences
288 Register temp1 = (for_compiler_entry ? saved_last_sp_register() : R1_tmp);
289 Register temp2 = AARCH64_ONLY(R9) NOT_AARCH64(R8);
290 Register temp3 = Rtemp; // R12/R16
291 Register temp4 = AARCH64_ONLY(Rtemp2) NOT_AARCH64(R5);
292 if (for_compiler_entry) {
293 assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : j_rarg0), "only valid assignment");
294 #ifdef AARCH64
295 assert_different_registers(temp1, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5, j_rarg6, j_rarg7);
296 assert_different_registers(temp2, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5, j_rarg6, j_rarg7);
297 assert_different_registers(temp3, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5, j_rarg6, j_rarg7);
298 assert_different_registers(temp4, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5, j_rarg6, j_rarg7);
299 #else
300 assert_different_registers(temp1, j_rarg0, j_rarg1, j_rarg2, j_rarg3);
301 assert_different_registers(temp2, j_rarg0, j_rarg1, j_rarg2, j_rarg3);
302 assert_different_registers(temp3, j_rarg0, j_rarg1, j_rarg2, j_rarg3);
303 assert_different_registers(temp4, j_rarg0, j_rarg1, j_rarg2, j_rarg3);
304 #endif // AARCH64
305 }
306 assert_different_registers(temp1, temp2, temp3, receiver_reg);
307 assert_different_registers(temp1, temp2, temp3, temp4, member_reg);
308 if (!for_compiler_entry)
309 assert_different_registers(temp1, temp2, temp3, temp4, saved_last_sp_register()); // don't trash lastSP
310
311 if (iid == vmIntrinsics::_invokeBasic) {
312 // indirect through MH.form.exactInvoker.vmtarget
313 jump_to_lambda_form(_masm, receiver_reg, temp3, for_compiler_entry);
314
315 } else {
316 // The method is a member invoker used by direct method handles.
317 if (VerifyMethodHandles) {
318 // make sure the trailing argument really is a MemberName (caller responsibility)
319 verify_klass(_masm, member_reg, temp2, temp3, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_invoke_MemberName),
320 "MemberName required for invokeVirtual etc.");
321 }
322
323 Address member_clazz( member_reg, NONZERO(java_lang_invoke_MemberName::clazz_offset_in_bytes()));
324 Address member_vmindex( member_reg, NONZERO(java_lang_invoke_MemberName::vmindex_offset_in_bytes()));
325 Address member_vmtarget(member_reg, NONZERO(java_lang_invoke_MemberName::method_offset_in_bytes()));
326 Address vmtarget_method(Rmethod, NONZERO(java_lang_invoke_ResolvedMethodName::vmtarget_offset_in_bytes()));
327
328 Register temp1_recv_klass = temp1;
329 if (iid != vmIntrinsics::_linkToStatic) {
330 if (iid == vmIntrinsics::_linkToSpecial) {
331 // Don't actually load the klass; just null-check the receiver.
332 __ null_check(receiver_reg, temp3);
333 } else {
334 // load receiver klass itself
335 __ null_check(receiver_reg, temp3, oopDesc::klass_offset_in_bytes());
336 __ load_klass(temp1_recv_klass, receiver_reg);
337 __ verify_klass_ptr(temp1_recv_klass);
338 }
339 BLOCK_COMMENT("check_receiver {");
340 // The receiver for the MemberName must be in receiver_reg.
341 // Check the receiver against the MemberName.clazz
342 if (VerifyMethodHandles && iid == vmIntrinsics::_linkToSpecial) {
343 // Did not load it above...
344 __ load_klass(temp1_recv_klass, receiver_reg);
345 __ verify_klass_ptr(temp1_recv_klass);
346 }
347 // Check the receiver against the MemberName.clazz
348 if (VerifyMethodHandles && iid != vmIntrinsics::_linkToInterface) {
349 Label L_ok;
350 Register temp2_defc = temp2;
351 __ load_heap_oop(temp2_defc, member_clazz);
352 load_klass_from_Class(_masm, temp2_defc, temp3, temp4);
353 __ verify_klass_ptr(temp2_defc);
354 #ifdef AARCH64
355 // TODO-AARCH64
356 __ b(L_ok);
357 #else
358 __ check_klass_subtype(temp1_recv_klass, temp2_defc, temp3, temp4, noreg, L_ok);
359 #endif
360 // If we get here, the type check failed!
361 __ stop("receiver class disagrees with MemberName.clazz");
362 __ bind(L_ok);
363 }
364 BLOCK_COMMENT("} check_receiver");
365 }
366 if (iid == vmIntrinsics::_linkToSpecial ||
367 iid == vmIntrinsics::_linkToStatic) {
368 DEBUG_ONLY(temp1_recv_klass = noreg); // these guys didn't load the recv_klass
369 }
370
371 // Live registers at this point:
372 // member_reg - MemberName that was the extra argument
373 // temp1_recv_klass - klass of stacked receiver, if needed
374
375 Label L_incompatible_class_change_error;
376 switch (iid) {
377 case vmIntrinsics::_linkToSpecial:
378 if (VerifyMethodHandles) {
379 verify_ref_kind(_masm, JVM_REF_invokeSpecial, member_reg, temp3);
380 }
381 __ load_heap_oop(Rmethod, member_vmtarget);
382 __ ldr(Rmethod, vmtarget_method);
383 break;
384
385 case vmIntrinsics::_linkToStatic:
386 if (VerifyMethodHandles) {
387 verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp3);
388 }
389 __ load_heap_oop(Rmethod, member_vmtarget);
390 __ ldr(Rmethod, vmtarget_method);
391 break;
392 break;
393
394 case vmIntrinsics::_linkToVirtual:
395 {
396 // same as TemplateTable::invokevirtual,
397 // minus the CP setup and profiling:
398
399 if (VerifyMethodHandles) {
400 verify_ref_kind(_masm, JVM_REF_invokeVirtual, member_reg, temp3);
401 }
402
403 // pick out the vtable index from the MemberName, and then we can discard it:
404 Register temp2_index = temp2;
405 __ ldr(temp2_index, member_vmindex);
406
407 if (VerifyMethodHandles) {
408 Label L_index_ok;
409 __ cmp(temp2_index, 0);
410 __ b(L_index_ok, ge);
411 __ stop("no virtual index");
412 __ bind(L_index_ok);
413 }
414
415 // Note: The verifier invariants allow us to ignore MemberName.clazz and vmtarget
416 // at this point. And VerifyMethodHandles has already checked clazz, if needed.
417
418 // get target Method* & entry point
419 __ lookup_virtual_method(temp1_recv_klass, temp2_index, Rmethod);
420 break;
421 }
422
423 case vmIntrinsics::_linkToInterface:
424 {
425 // same as TemplateTable::invokeinterface
426 // (minus the CP setup and profiling, with different argument motion)
427 if (VerifyMethodHandles) {
428 verify_ref_kind(_masm, JVM_REF_invokeInterface, member_reg, temp3);
429 }
430
431 Register temp3_intf = temp3;
432 __ load_heap_oop(temp3_intf, member_clazz);
433 load_klass_from_Class(_masm, temp3_intf, temp2, temp4);
434 __ verify_klass_ptr(temp3_intf);
435
436 Register rbx_index = rbx_method;
437 __ ldr(rbx_index, member_vmindex);
438 if (VerifyMethodHandles) {
439 Label L;
440 __ cmp(rbx_index, 0);
441 __ b(L, ge);
442 __ stop("invalid vtable index for MH.invokeInterface");
443 __ bind(L);
444 }
445
446 // given intf, index, and recv klass, dispatch to the implementation method
447 Label L_no_such_interface;
448 __ lookup_interface_method(temp1_recv_klass, temp3_intf,
449 // note: next two args must be the same:
450 rbx_index, rbx_method,
451 temp2, temp4,
452 L_incompatible_class_change_error);
453 break;
454 }
455
456 default:
457 fatal("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid));
458 break;
459 }
460
461 // Live at this point:
462 // Rmethod (target method)
463 // Rsender_sp, Rparams (if interpreted)
464 // register arguments (if compiled)
465
466 // After figuring out which concrete method to call, jump into it.
467 __ verify_method_ptr(Rmethod);
468 jump_from_method_handle(_masm, for_compiler_entry);
469
470 if (iid == vmIntrinsics::_linkToInterface) {
471 __ bind(L_incompatible_class_change_error);
472 __ jump(StubRoutines::throw_IncompatibleClassChangeError_entry(), relocInfo::runtime_call_type, Rtemp);
473 }
474 }
475 }
476
477
478 #ifndef PRODUCT
479 enum {
480 ARG_LIMIT = 255, SLOP = 4,
481 // use this parameter for checking for garbage stack movements:
482 UNREASONABLE_STACK_MOVE = (ARG_LIMIT + SLOP)
483 // the slop defends against false alarms due to fencepost errors
484 };
485
486 #ifdef AARCH64
487 const int trace_mh_nregs = 32; // R0-R30, PC
488 #else
489 const int trace_mh_nregs = 15;
490 const Register trace_mh_regs[trace_mh_nregs] =
491 {R0, R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, LR, PC};
492 #endif // AARCH64
493
494 void trace_method_handle_stub(const char* adaptername,
495 intptr_t* saved_regs,
496 intptr_t* saved_bp,
497 oop mh) {
498 // called as a leaf from native code: do not block the JVM!
499 bool has_mh = (strstr(adaptername, "/static") == NULL &&
500 strstr(adaptername, "linkTo") == NULL); // static linkers don't have MH
501 intptr_t* entry_sp = (intptr_t*) &saved_regs[trace_mh_nregs]; // just after the saved regs
502 intptr_t* saved_sp = (intptr_t*) saved_regs[Rsender_sp->encoding()]; // save of Rsender_sp
503 intptr_t* last_sp = (intptr_t*) saved_bp[AARCH64_ONLY(frame::interpreter_frame_stack_top_offset) NOT_AARCH64(frame::interpreter_frame_last_sp_offset)];
504 intptr_t* base_sp = last_sp;
505
506 intptr_t mh_reg = (intptr_t)saved_regs[R5_mh->encoding()];
507 const char* mh_reg_name = "R5_mh";
508 if (!has_mh) mh_reg_name = "R5";
509 tty->print_cr("MH %s %s=" PTR_FORMAT " sp=(" PTR_FORMAT "+" INTX_FORMAT ") stack_size=" INTX_FORMAT " bp=" PTR_FORMAT,
510 adaptername, mh_reg_name, mh_reg,
511 (intptr_t)entry_sp, (intptr_t)saved_sp - (intptr_t)entry_sp, (intptr_t)(base_sp - last_sp), (intptr_t)saved_bp);
512
513 if (last_sp != saved_sp && last_sp != NULL)
514 tty->print_cr("*** last_sp=" INTPTR_FORMAT, p2i(last_sp));
515 if (Verbose) {
516 tty->print(" reg dump: ");
517 int i;
518 for (i = 0; i < trace_mh_nregs; i++) {
519 if (i > 0 && i % AARCH64_ONLY(2) NOT_AARCH64(4) == 0)
520 tty->print("\n + dump: ");
521 #ifdef AARCH64
522 const char* reg_name = (i == trace_mh_nregs-1) ? "pc" : as_Register(i)->name();
523 #else
524 const char* reg_name = trace_mh_regs[i]->name();
525 #endif
526 tty->print(" %s: " INTPTR_FORMAT, reg_name, p2i((void *)saved_regs[i]));
527 }
528 tty->cr();
529 }
530
531 if (Verbose) {
532 // dump last frame (from JavaThread::print_frame_layout)
533
534 // Note: code is robust but the dumped informationm may not be
535 // 100% correct, particularly with respect to the dumped
536 // "unextended_sp". Getting it right for all trace_method_handle
537 // call paths is not worth the complexity/risk. The correct slot
538 // will be identified by *Rsender_sp anyway in the dump.
539 JavaThread* p = JavaThread::active();
540
541 ResourceMark rm;
542 PRESERVE_EXCEPTION_MARK;
543 FrameValues values;
544
545 intptr_t* dump_fp = (intptr_t *) saved_bp;
546 address dump_pc = (address) saved_regs[trace_mh_nregs-2]; // LR (with LR,PC last in saved_regs)
547 frame dump_frame((intptr_t *)entry_sp, dump_fp, dump_pc);
548
549 dump_frame.describe(values, 1);
550 // mark Rsender_sp if seems valid
551 if (has_mh) {
552 if ((saved_sp >= entry_sp - UNREASONABLE_STACK_MOVE) && (saved_sp < dump_fp)) {
553 values.describe(-1, saved_sp, "*Rsender_sp");
554 }
555 }
556
557 // Note: the unextended_sp may not be correct
558 tty->print_cr(" stack layout:");
559 values.print(p);
560 }
561 if (Verbose) {
562 if (has_mh && mh->is_oop()) {
563 mh->print();
564 if (java_lang_invoke_MethodHandle::is_instance(mh)) {
565 if (java_lang_invoke_MethodHandle::form_offset_in_bytes() != 0)
566 java_lang_invoke_MethodHandle::form(mh)->print();
567 }
568 }
569 }
570 }
571
572 void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) {
573 if (!TraceMethodHandles) return;
574 BLOCK_COMMENT("trace_method_handle {");
575 // register saving
576 // must correspond to trace_mh_nregs and trace_mh_regs defined above
577 int push_size = __ save_all_registers();
578 assert(trace_mh_nregs*wordSize == push_size,"saved register count mismatch");
579
580 __ mov_slow(R0, adaptername);
581 __ mov(R1, SP); // entry_sp (after pushes)
582 __ mov(R2, FP);
583 if (R5_mh != R3) {
584 assert_different_registers(R0, R1, R2, R5_mh);
585 __ mov(R3, R5_mh);
586 }
587
588 __ call_VM_leaf(CAST_FROM_FN_PTR(address, trace_method_handle_stub), R0, R1, R2, R3);
589
590 __ restore_all_registers();
591 BLOCK_COMMENT("} trace_method_handle");
592 }
593 #endif //PRODUCT