1/*
2 * Copyright (c) 2008, 2016, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25// 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/methodHandles.hpp"
36
37#define __ _masm->
38
39#ifdef PRODUCT
40#define BLOCK_COMMENT(str) /* nothing */
41#else
42#define BLOCK_COMMENT(str) __ block_comment(str)
43#endif
44
45#define BIND(label) bind(label); BLOCK_COMMENT(#label ":")
46
47void MethodHandles::load_klass_from_Class(MacroAssembler* _masm, Register klass_reg, Register temp1, Register temp2) {
48  if (VerifyMethodHandles) {
49    verify_klass(_masm, klass_reg, temp1, temp2, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_Class),
50                 "MH argument is a Class");
51  }
52  __ ldr(klass_reg, Address(klass_reg, java_lang_Class::klass_offset_in_bytes()));
53}
54
55#ifdef ASSERT
56static 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
66void MethodHandles::verify_klass(MacroAssembler* _masm,
67                                 Register obj, Register temp1, Register temp2, SystemDictionary::WKID klass_id,
68                                 const char* error_message) {
69  InstanceKlass** klass_addr = SystemDictionary::well_known_klass_addr(klass_id);
70  KlassHandle klass = SystemDictionary::well_known_klass(klass_id);
71  Label L_ok, L_bad;
72  BLOCK_COMMENT("verify_klass {");
73  __ verify_oop(obj);
74  __ cbz(obj, L_bad);
75  __ load_klass(temp1, obj);
76  __ lea(temp2, ExternalAddress((address) klass_addr));
77  __ ldr(temp2, temp2); // the cmpptr on x86 dereferences the AddressLiteral (not lea)
78  __ cmp(temp1, temp2);
79  __ b(L_ok, eq);
80  intptr_t super_check_offset = klass->super_check_offset();
81  __ ldr(temp1, Address(temp1, super_check_offset));
82  __ cmp(temp1, temp2);
83  __ b(L_ok, eq);
84
85  __ bind(L_bad);
86  __ stop(error_message);
87  __ BIND(L_ok);
88  BLOCK_COMMENT("} verify_klass");
89}
90
91void MethodHandles::verify_ref_kind(MacroAssembler* _masm, int ref_kind, Register member_reg, Register temp) {
92  Label L;
93  BLOCK_COMMENT("verify_ref_kind {");
94  __ ldr_u32(temp, Address(member_reg, NONZERO(java_lang_invoke_MemberName::flags_offset_in_bytes())));
95  __ logical_shift_right(temp, temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT);
96  __ andr(temp, temp, (unsigned)java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK);
97  __ cmp(temp, ref_kind);
98  __ b(L, eq);
99  { char* buf = NEW_C_HEAP_ARRAY(char, 100, mtInternal);
100  jio_snprintf(buf, 100, "verify_ref_kind expected %x", ref_kind);
101  if (ref_kind == JVM_REF_invokeVirtual ||
102      ref_kind == JVM_REF_invokeSpecial)
103    // could do this for all ref_kinds, but would explode assembly code size
104    trace_method_handle(_masm, buf);
105  __ stop(buf);
106  }
107  BLOCK_COMMENT("} verify_ref_kind");
108  __ bind(L);
109}
110
111#endif //ASSERT
112
113void MethodHandles::jump_from_method_handle(MacroAssembler* _masm, bool for_compiler_entry) {
114  Label L_no_such_method;
115  __ cbz(Rmethod, L_no_such_method);
116
117  // Note: JVMTI overhead seems small enough compared to invocation
118  // cost and is not worth the complexity or code size overhead of
119  // supporting several variants of each adapter.
120  if (!for_compiler_entry && (JvmtiExport::can_post_interpreter_events())) {
121    // JVMTI events, such as single-stepping, are implemented partly by avoiding running
122    // compiled code in threads for which the event is enabled.  Check here for
123    // interp_only_mode if these events CAN be enabled.
124    __ ldr_s32(Rtemp, Address(Rthread, JavaThread::interp_only_mode_offset()));
125#ifdef AARCH64
126    Label L;
127    __ cbz(Rtemp, L);
128    __ indirect_jump(Address(Rmethod, Method::interpreter_entry_offset()), Rtemp);
129    __ bind(L);
130#else
131    __ cmp(Rtemp, 0);
132    __ ldr(PC, Address(Rmethod, Method::interpreter_entry_offset()), ne);
133#endif // AARCH64
134  }
135  const ByteSize entry_offset = for_compiler_entry ? Method::from_compiled_offset() :
136                                                     Method::from_interpreted_offset();
137
138  __ indirect_jump(Address(Rmethod, entry_offset), Rtemp);
139
140  __ bind(L_no_such_method);
141  // throw exception
142  __ jump(StubRoutines::throw_AbstractMethodError_entry(), relocInfo::runtime_call_type, Rtemp);
143}
144
145void MethodHandles::jump_to_lambda_form(MacroAssembler* _masm,
146                                        Register recv, Register tmp,
147                                        bool for_compiler_entry) {
148  BLOCK_COMMENT("jump_to_lambda_form {");
149  // This is the initial entry point of a lazy method handle.
150  // After type checking, it picks up the invoker from the LambdaForm.
151  assert_different_registers(recv, tmp, Rmethod);
152
153  // Load the invoker, as MH -> MH.form -> LF.vmentry
154  __ load_heap_oop(tmp, Address(recv, NONZERO(java_lang_invoke_MethodHandle::form_offset_in_bytes())));
155  __ verify_oop(tmp);
156
157  __ load_heap_oop(tmp, Address(tmp, NONZERO(java_lang_invoke_LambdaForm::vmentry_offset_in_bytes())));
158  __ verify_oop(tmp);
159
160  // the following assumes that a Method* is normally compressed in the vmtarget field:
161  __ ldr(Rmethod, Address(tmp, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes())));
162
163  if (VerifyMethodHandles && !for_compiler_entry) {
164    // make sure recv is already on stack
165    __ ldr(tmp, Address(Rmethod, Method::const_offset()));
166    __ load_sized_value(tmp,
167                        Address(tmp, ConstMethod::size_of_parameters_offset()),
168                        sizeof(u2), /*is_signed*/ false);
169    // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), "");
170    Label L;
171    __ ldr(tmp, __ receiver_argument_address(Rparams, tmp, tmp));
172    __ cmp(tmp, recv);
173    __ b(L, eq);
174    __ stop("receiver not on stack");
175    __ bind(L);
176  }
177
178  jump_from_method_handle(_masm, for_compiler_entry);
179  BLOCK_COMMENT("} jump_to_lambda_form");
180}
181
182
183// Code generation
184address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* _masm,
185                                                                vmIntrinsics::ID iid) {
186  const bool not_for_compiler_entry = false;  // this is the interpreter entry
187  assert(is_signature_polymorphic(iid), "expected invoke iid");
188  if (iid == vmIntrinsics::_invokeGeneric ||
189      iid == vmIntrinsics::_compiledLambdaForm) {
190    // Perhaps surprisingly, the user-visible names, and linkToCallSite, are not directly used.
191    // They are linked to Java-generated adapters via MethodHandleNatives.linkMethod.
192    // They all require an extra argument.
193    __ should_not_reach_here();           // empty stubs make SG sick
194    return NULL;
195  }
196
197  // Rmethod: Method*
198  // Rparams (SP on 32-bit ARM): pointer to parameters
199  // Rsender_sp (R4/R19): sender SP (must preserve; see prepare_to_jump_from_interpreted)
200  // R5_mh: receiver method handle (must load from sp[MethodTypeForm.vmslots])
201  // R1, R2, Rtemp: garbage temp, blown away
202
203  // Use same name as x86 to ease future merges
204  Register rdx_temp       = R2_tmp;
205  Register rdx_param_size = rdx_temp;  // size of parameters
206  Register rax_temp       = R1_tmp;
207  Register rcx_mh         = R5_mh;     // MH receiver; dies quickly and is recycled
208  Register rbx_method     = Rmethod;   // eventual target of this invocation
209  Register rdi_temp       = Rtemp;
210
211  // here's where control starts out:
212  __ align(CodeEntryAlignment);
213  address entry_point = __ pc();
214
215  if (VerifyMethodHandles) {
216    Label L;
217    BLOCK_COMMENT("verify_intrinsic_id {");
218    __ ldrh(rdi_temp, Address(rbx_method, Method::intrinsic_id_offset_in_bytes()));
219    __ sub_slow(rdi_temp, rdi_temp, (int) iid);
220    __ cbz(rdi_temp, L);
221    if (iid == vmIntrinsics::_linkToVirtual ||
222        iid == vmIntrinsics::_linkToSpecial) {
223      // could do this for all kinds, but would explode assembly code size
224      trace_method_handle(_masm, "bad Method*::intrinsic_id");
225    }
226    __ stop("bad Method*::intrinsic_id");
227    __ bind(L);
228    BLOCK_COMMENT("} verify_intrinsic_id");
229  }
230
231  // First task:  Find out how big the argument list is.
232  Address rdx_first_arg_addr;
233  int ref_kind = signature_polymorphic_intrinsic_ref_kind(iid);
234  assert(ref_kind != 0 || iid == vmIntrinsics::_invokeBasic, "must be _invokeBasic or a linkTo intrinsic");
235  if (ref_kind == 0 || MethodHandles::ref_kind_has_receiver(ref_kind)) {
236    __ ldr(rdx_param_size, Address(rbx_method, Method::const_offset()));
237    __ load_sized_value(rdx_param_size,
238                        Address(rdx_param_size, ConstMethod::size_of_parameters_offset()),
239                        sizeof(u2), /*is_signed*/ false);
240    // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), "");
241    rdx_first_arg_addr = __ receiver_argument_address(Rparams, rdx_param_size, rdi_temp);
242  } else {
243    DEBUG_ONLY(rdx_param_size = noreg);
244  }
245
246  if (!is_signature_polymorphic_static(iid)) {
247    __ ldr(rcx_mh, rdx_first_arg_addr);
248    DEBUG_ONLY(rdx_param_size = noreg);
249  }
250
251  // rdx_first_arg_addr is live!
252
253  trace_method_handle_interpreter_entry(_masm, iid);
254
255  if (iid == vmIntrinsics::_invokeBasic) {
256    generate_method_handle_dispatch(_masm, iid, rcx_mh, noreg, not_for_compiler_entry);
257
258  } else {
259    // Adjust argument list by popping the trailing MemberName argument.
260    Register rcx_recv = noreg;
261    if (MethodHandles::ref_kind_has_receiver(ref_kind)) {
262      // Load the receiver (not the MH; the actual MemberName's receiver) up from the interpreter stack.
263      __ ldr(rcx_recv = rcx_mh, rdx_first_arg_addr);
264      DEBUG_ONLY(rdx_param_size = noreg);
265    }
266    Register rbx_member = rbx_method;  // MemberName ptr; incoming method ptr is dead now
267#ifdef AARCH64
268    __ ldr(rbx_member, Address(Rparams, Interpreter::stackElementSize, post_indexed));
269#else
270    __ pop(rbx_member);
271#endif
272    generate_method_handle_dispatch(_masm, iid, rcx_recv, rbx_member, not_for_compiler_entry);
273  }
274  return entry_point;
275}
276
277void MethodHandles::generate_method_handle_dispatch(MacroAssembler* _masm,
278                                                    vmIntrinsics::ID iid,
279                                                    Register receiver_reg,
280                                                    Register member_reg,
281                                                    bool for_compiler_entry) {
282  assert(is_signature_polymorphic(iid), "expected invoke iid");
283  // Use same name as x86 to ease future merges
284  Register rbx_method = Rmethod;   // eventual target of this invocation
285  // temps used in this code are not used in *either* compiled or interpreted calling sequences
286  Register temp1 = (for_compiler_entry ? saved_last_sp_register() : R1_tmp);
287  Register temp2 = AARCH64_ONLY(R9) NOT_AARCH64(R8);
288  Register temp3 = Rtemp; // R12/R16
289  Register temp4 = AARCH64_ONLY(Rtemp2) NOT_AARCH64(R5);
290  if (for_compiler_entry) {
291    assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : j_rarg0), "only valid assignment");
292#ifdef AARCH64
293    assert_different_registers(temp1, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5, j_rarg6, j_rarg7);
294    assert_different_registers(temp2, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5, j_rarg6, j_rarg7);
295    assert_different_registers(temp3, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5, j_rarg6, j_rarg7);
296    assert_different_registers(temp4, j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5, j_rarg6, j_rarg7);
297#else
298    assert_different_registers(temp1, j_rarg0, j_rarg1, j_rarg2, j_rarg3);
299    assert_different_registers(temp2, j_rarg0, j_rarg1, j_rarg2, j_rarg3);
300    assert_different_registers(temp3, j_rarg0, j_rarg1, j_rarg2, j_rarg3);
301    assert_different_registers(temp4, j_rarg0, j_rarg1, j_rarg2, j_rarg3);
302#endif // AARCH64
303  }
304  assert_different_registers(temp1, temp2, temp3, receiver_reg);
305  assert_different_registers(temp1, temp2, temp3, temp4, member_reg);
306  if (!for_compiler_entry)
307    assert_different_registers(temp1, temp2, temp3, temp4, saved_last_sp_register());  // don't trash lastSP
308
309  if (iid == vmIntrinsics::_invokeBasic) {
310    // indirect through MH.form.exactInvoker.vmtarget
311    jump_to_lambda_form(_masm, receiver_reg, temp3, for_compiler_entry);
312
313  } else {
314    // The method is a member invoker used by direct method handles.
315    if (VerifyMethodHandles) {
316      // make sure the trailing argument really is a MemberName (caller responsibility)
317      verify_klass(_masm, member_reg, temp2, temp3, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_invoke_MemberName),
318                   "MemberName required for invokeVirtual etc.");
319    }
320
321    Address member_clazz(   member_reg, NONZERO(java_lang_invoke_MemberName::clazz_offset_in_bytes()));
322    Address member_vmindex( member_reg, NONZERO(java_lang_invoke_MemberName::vmindex_offset_in_bytes()));
323    Address member_vmtarget(member_reg, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes()));
324
325    Register temp1_recv_klass = temp1;
326    if (iid != vmIntrinsics::_linkToStatic) {
327      if (iid == vmIntrinsics::_linkToSpecial) {
328        // Don't actually load the klass; just null-check the receiver.
329        __ null_check(receiver_reg, temp3);
330      } else {
331        // load receiver klass itself
332        __ null_check(receiver_reg, temp3, oopDesc::klass_offset_in_bytes());
333        __ load_klass(temp1_recv_klass, receiver_reg);
334        __ verify_klass_ptr(temp1_recv_klass);
335      }
336      BLOCK_COMMENT("check_receiver {");
337      // The receiver for the MemberName must be in receiver_reg.
338      // Check the receiver against the MemberName.clazz
339      if (VerifyMethodHandles && iid == vmIntrinsics::_linkToSpecial) {
340        // Did not load it above...
341        __ load_klass(temp1_recv_klass, receiver_reg);
342        __ verify_klass_ptr(temp1_recv_klass);
343      }
344      // Check the receiver against the MemberName.clazz
345      if (VerifyMethodHandles && iid != vmIntrinsics::_linkToInterface) {
346        Label L_ok;
347        Register temp2_defc = temp2;
348        __ load_heap_oop(temp2_defc, member_clazz);
349        load_klass_from_Class(_masm, temp2_defc, temp3, temp4);
350        __ verify_klass_ptr(temp2_defc);
351#ifdef AARCH64
352        // TODO-AARCH64
353        __ b(L_ok);
354#else
355        __ check_klass_subtype(temp1_recv_klass, temp2_defc, temp3, temp4, noreg, L_ok);
356#endif
357        // If we get here, the type check failed!
358        __ stop("receiver class disagrees with MemberName.clazz");
359        __ bind(L_ok);
360      }
361      BLOCK_COMMENT("} check_receiver");
362    }
363    if (iid == vmIntrinsics::_linkToSpecial ||
364        iid == vmIntrinsics::_linkToStatic) {
365      DEBUG_ONLY(temp1_recv_klass = noreg);  // these guys didn't load the recv_klass
366    }
367
368    // Live registers at this point:
369    //  member_reg - MemberName that was the extra argument
370    //  temp1_recv_klass - klass of stacked receiver, if needed
371
372    Label L_incompatible_class_change_error;
373    switch (iid) {
374    case vmIntrinsics::_linkToSpecial:
375      if (VerifyMethodHandles) {
376        verify_ref_kind(_masm, JVM_REF_invokeSpecial, member_reg, temp3);
377      }
378      __ ldr(Rmethod, member_vmtarget);
379      break;
380
381    case vmIntrinsics::_linkToStatic:
382      if (VerifyMethodHandles) {
383        verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp3);
384      }
385      __ ldr(Rmethod, member_vmtarget);
386      break;
387
388    case vmIntrinsics::_linkToVirtual:
389    {
390      // same as TemplateTable::invokevirtual,
391      // minus the CP setup and profiling:
392
393      if (VerifyMethodHandles) {
394        verify_ref_kind(_masm, JVM_REF_invokeVirtual, member_reg, temp3);
395      }
396
397      // pick out the vtable index from the MemberName, and then we can discard it:
398      Register temp2_index = temp2;
399      __ ldr(temp2_index, member_vmindex);
400
401      if (VerifyMethodHandles) {
402        Label L_index_ok;
403        __ cmp(temp2_index, 0);
404        __ b(L_index_ok, ge);
405        __ stop("no virtual index");
406        __ bind(L_index_ok);
407      }
408
409      // Note:  The verifier invariants allow us to ignore MemberName.clazz and vmtarget
410      // at this point.  And VerifyMethodHandles has already checked clazz, if needed.
411
412      // get target Method* & entry point
413      __ lookup_virtual_method(temp1_recv_klass, temp2_index, Rmethod);
414      break;
415    }
416
417    case vmIntrinsics::_linkToInterface:
418    {
419      // same as TemplateTable::invokeinterface
420      // (minus the CP setup and profiling, with different argument motion)
421      if (VerifyMethodHandles) {
422        verify_ref_kind(_masm, JVM_REF_invokeInterface, member_reg, temp3);
423      }
424
425      Register temp3_intf = temp3;
426      __ load_heap_oop(temp3_intf, member_clazz);
427      load_klass_from_Class(_masm, temp3_intf, temp2, temp4);
428      __ verify_klass_ptr(temp3_intf);
429
430      Register rbx_index = rbx_method;
431      __ ldr(rbx_index, member_vmindex);
432      if (VerifyMethodHandles) {
433        Label L;
434        __ cmp(rbx_index, 0);
435        __ b(L, ge);
436        __ stop("invalid vtable index for MH.invokeInterface");
437        __ bind(L);
438      }
439
440      // given intf, index, and recv klass, dispatch to the implementation method
441      Label L_no_such_interface;
442      __ lookup_interface_method(temp1_recv_klass, temp3_intf,
443                                 // note: next two args must be the same:
444                                 rbx_index, rbx_method,
445                                 temp2, temp4,
446                                 L_incompatible_class_change_error);
447      break;
448    }
449
450    default:
451      fatal("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid));
452      break;
453    }
454
455    // Live at this point:
456    //   Rmethod (target method)
457    //   Rsender_sp, Rparams (if interpreted)
458    //   register arguments (if compiled)
459
460    // After figuring out which concrete method to call, jump into it.
461    __ verify_method_ptr(Rmethod);
462    jump_from_method_handle(_masm, for_compiler_entry);
463
464    if (iid == vmIntrinsics::_linkToInterface) {
465      __ bind(L_incompatible_class_change_error);
466      __ jump(StubRoutines::throw_IncompatibleClassChangeError_entry(), relocInfo::runtime_call_type, Rtemp);
467    }
468  }
469}
470
471
472#ifndef PRODUCT
473enum {
474  ARG_LIMIT = 255, SLOP = 4,
475  // use this parameter for checking for garbage stack movements:
476  UNREASONABLE_STACK_MOVE = (ARG_LIMIT + SLOP)
477  // the slop defends against false alarms due to fencepost errors
478};
479
480#ifdef AARCH64
481const int trace_mh_nregs = 32; // R0-R30, PC
482#else
483const int trace_mh_nregs = 15;
484const Register trace_mh_regs[trace_mh_nregs] =
485  {R0, R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, R11, R12, LR, PC};
486#endif // AARCH64
487
488void trace_method_handle_stub(const char* adaptername,
489                              intptr_t* saved_regs,
490                              intptr_t* saved_bp,
491                              oop mh) {
492  // called as a leaf from native code: do not block the JVM!
493  bool has_mh = (strstr(adaptername, "/static") == NULL &&
494                 strstr(adaptername, "linkTo") == NULL);    // static linkers don't have MH
495  intptr_t* entry_sp = (intptr_t*) &saved_regs[trace_mh_nregs]; // just after the saved regs
496  intptr_t* saved_sp = (intptr_t*)  saved_regs[Rsender_sp->encoding()]; // save of Rsender_sp
497  intptr_t* last_sp  = (intptr_t*)  saved_bp[AARCH64_ONLY(frame::interpreter_frame_stack_top_offset) NOT_AARCH64(frame::interpreter_frame_last_sp_offset)];
498  intptr_t* base_sp  = last_sp;
499
500  intptr_t    mh_reg = (intptr_t)saved_regs[R5_mh->encoding()];
501  const char* mh_reg_name = "R5_mh";
502  if (!has_mh)  mh_reg_name = "R5";
503  tty->print_cr("MH %s %s=" PTR_FORMAT " sp=(" PTR_FORMAT "+" INTX_FORMAT ") stack_size=" INTX_FORMAT " bp=" PTR_FORMAT,
504                adaptername, mh_reg_name, mh_reg,
505                (intptr_t)entry_sp, (intptr_t)saved_sp - (intptr_t)entry_sp, (intptr_t)(base_sp - last_sp), (intptr_t)saved_bp);
506
507  if (last_sp != saved_sp && last_sp != NULL)
508    tty->print_cr("*** last_sp=" INTPTR_FORMAT, p2i(last_sp));
509  if (Verbose) {
510    tty->print(" reg dump: ");
511    int i;
512    for (i = 0; i < trace_mh_nregs; i++) {
513      if (i > 0 && i % AARCH64_ONLY(2) NOT_AARCH64(4) == 0)
514        tty->print("\n   + dump: ");
515#ifdef AARCH64
516      const char* reg_name = (i == trace_mh_nregs-1) ? "pc" : as_Register(i)->name();
517#else
518      const char* reg_name = trace_mh_regs[i]->name();
519#endif
520      tty->print(" %s: " INTPTR_FORMAT, reg_name, p2i((void *)saved_regs[i]));
521    }
522    tty->cr();
523  }
524
525  if (Verbose) {
526    // dump last frame (from JavaThread::print_frame_layout)
527
528    // Note: code is robust but the dumped informationm may not be
529    // 100% correct, particularly with respect to the dumped
530    // "unextended_sp". Getting it right for all trace_method_handle
531    // call paths is not worth the complexity/risk. The correct slot
532    // will be identified by *Rsender_sp anyway in the dump.
533    JavaThread* p = JavaThread::active();
534
535    ResourceMark rm;
536    PRESERVE_EXCEPTION_MARK;
537    FrameValues values;
538
539    intptr_t* dump_fp = (intptr_t *) saved_bp;
540    address dump_pc = (address) saved_regs[trace_mh_nregs-2]; // LR (with LR,PC last in saved_regs)
541    frame dump_frame((intptr_t *)entry_sp, dump_fp, dump_pc);
542
543    dump_frame.describe(values, 1);
544    // mark Rsender_sp if seems valid
545    if (has_mh) {
546      if ((saved_sp >= entry_sp - UNREASONABLE_STACK_MOVE) && (saved_sp < dump_fp)) {
547        values.describe(-1, saved_sp, "*Rsender_sp");
548      }
549    }
550
551    // Note: the unextended_sp may not be correct
552    tty->print_cr("  stack layout:");
553    values.print(p);
554  }
555  if (Verbose) {
556    if (has_mh && mh->is_oop()) {
557      mh->print();
558      if (java_lang_invoke_MethodHandle::is_instance(mh)) {
559        if (java_lang_invoke_MethodHandle::form_offset_in_bytes() != 0)
560          java_lang_invoke_MethodHandle::form(mh)->print();
561      }
562    }
563  }
564}
565
566void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) {
567  if (!TraceMethodHandles)  return;
568  BLOCK_COMMENT("trace_method_handle {");
569  // register saving
570  //  must correspond to trace_mh_nregs and trace_mh_regs defined above
571  int push_size = __ save_all_registers();
572  assert(trace_mh_nregs*wordSize == push_size,"saved register count mismatch");
573
574  __ mov_slow(R0, adaptername);
575  __ mov(R1, SP); // entry_sp (after pushes)
576  __ mov(R2, FP);
577  if (R5_mh != R3) {
578    assert_different_registers(R0, R1, R2, R5_mh);
579    __ mov(R3, R5_mh);
580  }
581
582  __ call_VM_leaf(CAST_FROM_FN_PTR(address, trace_method_handle_stub), R0, R1, R2, R3);
583
584  __ restore_all_registers();
585  BLOCK_COMMENT("} trace_method_handle");
586}
587#endif //PRODUCT
588