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 #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/interp_masm.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 // Workaround for C++ overloading nastiness on '0' for RegisterOrConstant.
  49 static RegisterOrConstant constant(int value) {
  50   return RegisterOrConstant(value);
  51 }
  52 
  53 void MethodHandles::load_klass_from_Class(MacroAssembler* _masm, Register klass_reg, Register temp_reg, Register temp2_reg) {
  54   if (VerifyMethodHandles)
  55     verify_klass(_masm, klass_reg, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_Class), temp_reg, temp2_reg,
  56                  "MH argument is a Class");
  57   __ ld_ptr(Address(klass_reg, java_lang_Class::klass_offset_in_bytes()), klass_reg);
  58 }
  59 
  60 #ifdef ASSERT
  61 static int check_nonzero(const char* xname, int x) {
  62   assert(x != 0, "%s should be nonzero", xname);
  63   return x;
  64 }
  65 #define NONZERO(x) check_nonzero(#x, x)
  66 #else //ASSERT
  67 #define NONZERO(x) (x)
  68 #endif //ASSERT
  69 
  70 #ifdef ASSERT
  71 void MethodHandles::verify_klass(MacroAssembler* _masm,
  72                                  Register obj_reg, SystemDictionary::WKID klass_id,
  73                                  Register temp_reg, Register temp2_reg,
  74                                  const char* error_message) {
  75   InstanceKlass** klass_addr = SystemDictionary::well_known_klass_addr(klass_id);
  76   Klass* klass = SystemDictionary::well_known_klass(klass_id);
  77   bool did_save = false;
  78   if (temp_reg == noreg || temp2_reg == noreg) {
  79     temp_reg = L1;
  80     temp2_reg = L2;
  81     __ save_frame_and_mov(0, obj_reg, L0);
  82     obj_reg = L0;
  83     did_save = true;
  84   }
  85   Label L_ok, L_bad;
  86   BLOCK_COMMENT("verify_klass {");
  87   __ verify_oop(obj_reg);
  88   __ br_null_short(obj_reg, Assembler::pn, L_bad);
  89   __ load_klass(obj_reg, temp_reg);
  90   __ set(ExternalAddress((Metadata**)klass_addr), temp2_reg);
  91   __ ld_ptr(Address(temp2_reg, 0), temp2_reg);
  92   __ cmp_and_brx_short(temp_reg, temp2_reg, Assembler::equal, Assembler::pt, L_ok);
  93   intptr_t super_check_offset = klass->super_check_offset();
  94   __ ld_ptr(Address(temp_reg, super_check_offset), temp_reg);
  95   __ set(ExternalAddress((Metadata**)klass_addr), temp2_reg);
  96   __ ld_ptr(Address(temp2_reg, 0), temp2_reg);
  97   __ cmp_and_brx_short(temp_reg, temp2_reg, Assembler::equal, Assembler::pt, L_ok);
  98   __ BIND(L_bad);
  99   if (did_save)  __ restore();
 100   __ STOP(error_message);
 101   __ BIND(L_ok);
 102   if (did_save)  __ restore();
 103   BLOCK_COMMENT("} verify_klass");
 104 }
 105 
 106 void MethodHandles::verify_ref_kind(MacroAssembler* _masm, int ref_kind, Register member_reg, Register temp) {
 107   Label L;
 108   BLOCK_COMMENT("verify_ref_kind {");
 109   __ lduw(Address(member_reg, NONZERO(java_lang_invoke_MemberName::flags_offset_in_bytes())), temp);
 110   __ srl( temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT, temp);
 111   __ and3(temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK,  temp);
 112   __ cmp_and_br_short(temp, ref_kind, Assembler::equal, Assembler::pt, L);
 113   { char* buf = NEW_C_HEAP_ARRAY(char, 100, mtInternal);
 114     jio_snprintf(buf, 100, "verify_ref_kind expected %x", ref_kind);
 115     if (ref_kind == JVM_REF_invokeVirtual ||
 116         ref_kind == JVM_REF_invokeSpecial)
 117       // could do this for all ref_kinds, but would explode assembly code size
 118       trace_method_handle(_masm, buf);
 119     __ STOP(buf);
 120   }
 121   BLOCK_COMMENT("} verify_ref_kind");
 122   __ bind(L);
 123 }
 124 
 125 #endif // ASSERT
 126 
 127 void MethodHandles::jump_from_method_handle(MacroAssembler* _masm, Register method, Register target, Register temp,
 128                                             bool for_compiler_entry) {
 129   Label L_no_such_method;
 130   assert(method == G5_method, "interpreter calling convention");
 131   assert_different_registers(method, target, temp);
 132 
 133   if (!for_compiler_entry && JvmtiExport::can_post_interpreter_events()) {
 134     Label run_compiled_code;
 135     // JVMTI events, such as single-stepping, are implemented partly by avoiding running
 136     // compiled code in threads for which the event is enabled.  Check here for
 137     // interp_only_mode if these events CAN be enabled.
 138     __ verify_thread();
 139     const Address interp_only(G2_thread, JavaThread::interp_only_mode_offset());
 140     __ ld(interp_only, temp);
 141     __ cmp_and_br_short(temp, 0, Assembler::zero, Assembler::pt, run_compiled_code);
 142     // Null method test is replicated below in compiled case,
 143     // it might be able to address across the verify_thread()
 144     __ br_null_short(G5_method, Assembler::pn, L_no_such_method);
 145     __ ld_ptr(G5_method, in_bytes(Method::interpreter_entry_offset()), target);
 146     __ jmp(target, 0);
 147     __ delayed()->nop();
 148     __ BIND(run_compiled_code);
 149     // Note: we could fill some delay slots here, but
 150     // it doesn't matter, since this is interpreter code.
 151   }
 152 
 153   // Compiled case, either static or fall-through from runtime conditional
 154   __ br_null_short(G5_method, Assembler::pn, L_no_such_method);
 155 
 156   const ByteSize entry_offset = for_compiler_entry ? Method::from_compiled_offset() :
 157                                                      Method::from_interpreted_offset();
 158   __ ld_ptr(G5_method, in_bytes(entry_offset), target);
 159   __ jmp(target, 0);
 160   __ delayed()->nop();
 161 
 162   __ bind(L_no_such_method);
 163   AddressLiteral ame(StubRoutines::throw_AbstractMethodError_entry());
 164   __ jump_to(ame, temp);
 165   __ delayed()->nop();
 166 }
 167 
 168 void MethodHandles::jump_to_lambda_form(MacroAssembler* _masm,
 169                                         Register recv, Register method_temp,
 170                                         Register temp2, Register temp3,
 171                                         bool for_compiler_entry) {
 172   BLOCK_COMMENT("jump_to_lambda_form {");
 173   // This is the initial entry point of a lazy method handle.
 174   // After type checking, it picks up the invoker from the LambdaForm.
 175   assert_different_registers(recv, method_temp, temp2);  // temp3 is only passed on
 176   assert(method_temp == G5_method, "required register for loading method");
 177 
 178   //NOT_PRODUCT({ FlagSetting fs(TraceMethodHandles, true); trace_method_handle(_masm, "LZMH"); });
 179 
 180   // Load the invoker, as MH -> MH.form -> LF.vmentry
 181   __ verify_oop(recv);
 182   __ load_heap_oop(Address(recv,        NONZERO(java_lang_invoke_MethodHandle::form_offset_in_bytes())),   method_temp);
 183   __ verify_oop(method_temp);
 184   __ load_heap_oop(Address(method_temp, NONZERO(java_lang_invoke_LambdaForm::vmentry_offset_in_bytes())),  method_temp);
 185   __ verify_oop(method_temp);
 186   __ load_heap_oop(Address(method_temp, NONZERO(java_lang_invoke_MemberName::method_offset_in_bytes())), method_temp);
 187   __ verify_oop(method_temp);
 188   __ ld_ptr(       Address(method_temp, NONZERO(java_lang_invoke_ResolvedMethodName::vmtarget_offset_in_bytes())),   method_temp);
 189 
 190   if (VerifyMethodHandles && !for_compiler_entry) {
 191     // make sure recv is already on stack
 192     __ ld_ptr(method_temp, in_bytes(Method::const_offset()), temp2);
 193     __ load_sized_value(Address(temp2, ConstMethod::size_of_parameters_offset()),
 194                         temp2,
 195                         sizeof(u2), /*is_signed*/ false);
 196     // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), "");
 197     Label L;
 198     __ ld_ptr(__ argument_address(temp2, temp2, -1), temp2);
 199     __ cmp_and_br_short(temp2, recv, Assembler::equal, Assembler::pt, L);
 200     __ STOP("receiver not on stack");
 201     __ BIND(L);
 202   }
 203 
 204   jump_from_method_handle(_masm, method_temp, temp2, temp3, for_compiler_entry);
 205   BLOCK_COMMENT("} jump_to_lambda_form");
 206 }
 207 
 208 
 209 // Code generation
 210 address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* _masm,
 211                                                                 vmIntrinsics::ID iid) {
 212   const bool not_for_compiler_entry = false;  // this is the interpreter entry
 213   assert(is_signature_polymorphic(iid), "expected invoke iid");
 214   if (iid == vmIntrinsics::_invokeGeneric ||
 215       iid == vmIntrinsics::_compiledLambdaForm) {
 216     // Perhaps surprisingly, the symbolic references visible to Java are not directly used.
 217     // They are linked to Java-generated adapters via MethodHandleNatives.linkMethod.
 218     // They all allow an appendix argument.
 219     __ should_not_reach_here();           // empty stubs make SG sick
 220     return NULL;
 221   }
 222 
 223   // I5_savedSP/O5_savedSP: sender SP (must preserve; see prepare_to_jump_from_interpreted)
 224   // G5_method:  Method*
 225   // G4 (Gargs): incoming argument list (must preserve)
 226   // O0: used as temp to hold mh or receiver
 227   // O1, O4: garbage temps, blown away
 228   Register O1_scratch    = O1;
 229   Register O4_param_size = O4;   // size of parameters
 230 
 231   // here's where control starts out:
 232   __ align(CodeEntryAlignment);
 233   address entry_point = __ pc();
 234 
 235   if (VerifyMethodHandles) {
 236     assert(Method::intrinsic_id_size_in_bytes() == 2, "assuming Method::_intrinsic_id is u2");
 237 
 238     Label L;
 239     BLOCK_COMMENT("verify_intrinsic_id {");
 240     __ lduh(Address(G5_method, Method::intrinsic_id_offset_in_bytes()), O1_scratch);
 241     __ cmp_and_br_short(O1_scratch, (int) iid, Assembler::equal, Assembler::pt, L);
 242     if (iid == vmIntrinsics::_linkToVirtual ||
 243         iid == vmIntrinsics::_linkToSpecial) {
 244       // could do this for all kinds, but would explode assembly code size
 245       trace_method_handle(_masm, "bad Method*::intrinsic_id");
 246     }
 247     __ STOP("bad Method*::intrinsic_id");
 248     __ bind(L);
 249     BLOCK_COMMENT("} verify_intrinsic_id");
 250   }
 251 
 252   // First task:  Find out how big the argument list is.
 253   Address O4_first_arg_addr;
 254   int ref_kind = signature_polymorphic_intrinsic_ref_kind(iid);
 255   assert(ref_kind != 0 || iid == vmIntrinsics::_invokeBasic, "must be _invokeBasic or a linkTo intrinsic");
 256   if (ref_kind == 0 || MethodHandles::ref_kind_has_receiver(ref_kind)) {
 257     __ ld_ptr(G5_method, in_bytes(Method::const_offset()), O4_param_size);
 258     __ load_sized_value(Address(O4_param_size, ConstMethod::size_of_parameters_offset()),
 259                         O4_param_size,
 260                         sizeof(u2), /*is_signed*/ false);
 261     // assert(sizeof(u2) == sizeof(Method::_size_of_parameters), "");
 262     O4_first_arg_addr = __ argument_address(O4_param_size, O4_param_size, -1);
 263   } else {
 264     DEBUG_ONLY(O4_param_size = noreg);
 265   }
 266 
 267   Register O0_mh = noreg;
 268   if (!is_signature_polymorphic_static(iid)) {
 269     __ ld_ptr(O4_first_arg_addr, O0_mh = O0);
 270     DEBUG_ONLY(O4_param_size = noreg);
 271   }
 272 
 273   // O4_first_arg_addr is live!
 274 
 275   if (TraceMethodHandles) {
 276     if (O0_mh != noreg)
 277       __ mov(O0_mh, G3_method_handle);  // make stub happy
 278     trace_method_handle_interpreter_entry(_masm, iid);
 279   }
 280 
 281   if (iid == vmIntrinsics::_invokeBasic) {
 282     generate_method_handle_dispatch(_masm, iid, O0_mh, noreg, not_for_compiler_entry);
 283 
 284   } else {
 285     // Adjust argument list by popping the trailing MemberName argument.
 286     Register O0_recv = noreg;
 287     if (MethodHandles::ref_kind_has_receiver(ref_kind)) {
 288       // Load the receiver (not the MH; the actual MemberName's receiver) up from the interpreter stack.
 289       __ ld_ptr(O4_first_arg_addr, O0_recv = O0);
 290       DEBUG_ONLY(O4_param_size = noreg);
 291     }
 292     Register G5_member = G5_method;  // MemberName ptr; incoming method ptr is dead now
 293     __ ld_ptr(__ argument_address(constant(0)), G5_member);
 294     __ add(Gargs, Interpreter::stackElementSize, Gargs);
 295     generate_method_handle_dispatch(_masm, iid, O0_recv, G5_member, not_for_compiler_entry);
 296   }
 297 
 298   return entry_point;
 299 }
 300 
 301 void MethodHandles::generate_method_handle_dispatch(MacroAssembler* _masm,
 302                                                     vmIntrinsics::ID iid,
 303                                                     Register receiver_reg,
 304                                                     Register member_reg,
 305                                                     bool for_compiler_entry) {
 306   assert(is_signature_polymorphic(iid), "expected invoke iid");
 307   Register temp1 = (for_compiler_entry ? G1_scratch : O1);
 308   Register temp2 = (for_compiler_entry ? G3_scratch : O2);
 309   Register temp3 = (for_compiler_entry ? G4_scratch : O3);
 310   Register temp4 = (for_compiler_entry ? noreg      : O4);
 311   if (for_compiler_entry) {
 312     assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : O0), "only valid assignment");
 313     assert_different_registers(temp1, O0, O1, O2, O3, O4, O5);
 314     assert_different_registers(temp2, O0, O1, O2, O3, O4, O5);
 315     assert_different_registers(temp3, O0, O1, O2, O3, O4, O5);
 316     assert_different_registers(temp4, O0, O1, O2, O3, O4, O5);
 317   } else {
 318     assert_different_registers(temp1, temp2, temp3, temp4, O5_savedSP);  // don't trash lastSP
 319   }
 320   if (receiver_reg != noreg)  assert_different_registers(temp1, temp2, temp3, temp4, receiver_reg);
 321   if (member_reg   != noreg)  assert_different_registers(temp1, temp2, temp3, temp4, member_reg);
 322 
 323   if (iid == vmIntrinsics::_invokeBasic) {
 324     // indirect through MH.form.vmentry.vmtarget
 325     jump_to_lambda_form(_masm, receiver_reg, G5_method, temp1, temp2, 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(MemberName_klass),
 332                    temp1, temp2,
 333                    "MemberName required for invokeVirtual etc.");
 334     }
 335 
 336     Address member_clazz(    member_reg, NONZERO(java_lang_invoke_MemberName::clazz_offset_in_bytes()));
 337     Address member_vmindex(  member_reg, NONZERO(java_lang_invoke_MemberName::vmindex_offset_in_bytes()));
 338     Address member_vmtarget( member_reg, NONZERO(java_lang_invoke_MemberName::method_offset_in_bytes()));
 339     Address vmtarget_method( G5_method, NONZERO(java_lang_invoke_ResolvedMethodName::vmtarget_offset_in_bytes()));
 340 
 341     Register temp1_recv_klass = temp1;
 342     if (iid != vmIntrinsics::_linkToStatic) {
 343       __ verify_oop(receiver_reg);
 344       if (iid == vmIntrinsics::_linkToSpecial) {
 345         // Don't actually load the klass; just null-check the receiver.
 346         __ null_check(receiver_reg);
 347       } else {
 348         // load receiver klass itself
 349         __ null_check(receiver_reg, oopDesc::klass_offset_in_bytes());
 350         __ load_klass(receiver_reg, temp1_recv_klass);
 351         __ verify_klass_ptr(temp1_recv_klass);
 352       }
 353       BLOCK_COMMENT("check_receiver {");
 354       // The receiver for the MemberName must be in receiver_reg.
 355       // Check the receiver against the MemberName.clazz
 356       if (VerifyMethodHandles && iid == vmIntrinsics::_linkToSpecial) {
 357         // Did not load it above...
 358         __ load_klass(receiver_reg, temp1_recv_klass);
 359         __ verify_klass_ptr(temp1_recv_klass);
 360       }
 361       if (VerifyMethodHandles && iid != vmIntrinsics::_linkToInterface) {
 362         Label L_ok;
 363         Register temp2_defc = temp2;
 364         __ load_heap_oop(member_clazz, temp2_defc);
 365         load_klass_from_Class(_masm, temp2_defc, temp3, temp4);
 366         __ verify_klass_ptr(temp2_defc);
 367         __ check_klass_subtype(temp1_recv_klass, temp2_defc, temp3, temp4, L_ok);
 368         // If we get here, the type check failed!
 369         __ STOP("receiver class disagrees with MemberName.clazz");
 370         __ bind(L_ok);
 371       }
 372       BLOCK_COMMENT("} check_receiver");
 373     }
 374     if (iid == vmIntrinsics::_linkToSpecial ||
 375         iid == vmIntrinsics::_linkToStatic) {
 376       DEBUG_ONLY(temp1_recv_klass = noreg);  // these guys didn't load the recv_klass
 377     }
 378 
 379     // Live registers at this point:
 380     //  member_reg - MemberName that was the trailing argument
 381     //  temp1_recv_klass - klass of stacked receiver, if needed
 382     //  O5_savedSP - interpreter linkage (if interpreted)
 383     //  O0..O5 - compiler arguments (if compiled)
 384 
 385     Label L_incompatible_class_change_error;
 386     switch (iid) {
 387     case vmIntrinsics::_linkToSpecial:
 388       if (VerifyMethodHandles) {
 389         verify_ref_kind(_masm, JVM_REF_invokeSpecial, member_reg, temp2);
 390       }
 391       __ load_heap_oop(member_vmtarget, G5_method);
 392       __ ld_ptr(vmtarget_method, G5_method);
 393       break;
 394 
 395     case vmIntrinsics::_linkToStatic:
 396       if (VerifyMethodHandles) {
 397         verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp2);
 398       }
 399       __ load_heap_oop(member_vmtarget, G5_method);
 400       __ ld_ptr(vmtarget_method, G5_method);
 401       break;
 402 
 403     case vmIntrinsics::_linkToVirtual:
 404     {
 405       // same as TemplateTable::invokevirtual,
 406       // minus the CP setup and profiling:
 407 
 408       if (VerifyMethodHandles) {
 409         verify_ref_kind(_masm, JVM_REF_invokeVirtual, member_reg, temp2);
 410       }
 411 
 412       // pick out the vtable index from the MemberName, and then we can discard it:
 413       Register temp2_index = temp2;
 414       __ ld_ptr(member_vmindex, temp2_index);
 415 
 416       if (VerifyMethodHandles) {
 417         Label L_index_ok;
 418         __ cmp_and_br_short(temp2_index, (int) 0, Assembler::greaterEqual, Assembler::pn, 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, G5_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, temp2);
 437       }
 438 
 439       Register temp2_intf = temp2;
 440       __ load_heap_oop(member_clazz, temp2_intf);
 441       load_klass_from_Class(_masm, temp2_intf, temp3, temp4);
 442       __ verify_klass_ptr(temp2_intf);
 443 
 444       Register G5_index = G5_method;
 445       __ ld_ptr(member_vmindex, G5_index);
 446       if (VerifyMethodHandles) {
 447         Label L;
 448         __ cmp_and_br_short(G5_index, 0, Assembler::greaterEqual, Assembler::pt, L);
 449         __ STOP("invalid vtable index for MH.invokeInterface");
 450         __ bind(L);
 451       }
 452 
 453       // given intf, index, and recv klass, dispatch to the implementation method
 454       __ lookup_interface_method(temp1_recv_klass, temp2_intf,
 455                                  // note: next two args must be the same:
 456                                  G5_index, G5_method,
 457                                  temp3, temp4,
 458                                  L_incompatible_class_change_error);
 459       break;
 460     }
 461 
 462     default:
 463       fatal("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid));
 464       break;
 465     }
 466 
 467     // Live at this point:
 468     //   G5_method
 469     //   O5_savedSP (if interpreted)
 470 
 471     // After figuring out which concrete method to call, jump into it.
 472     // Note that this works in the interpreter with no data motion.
 473     // But the compiled version will require that rcx_recv be shifted out.
 474     __ verify_method_ptr(G5_method);
 475     jump_from_method_handle(_masm, G5_method, temp1, temp2, for_compiler_entry);
 476 
 477     if (iid == vmIntrinsics::_linkToInterface) {
 478       __ BIND(L_incompatible_class_change_error);
 479       AddressLiteral icce(StubRoutines::throw_IncompatibleClassChangeError_entry());
 480       __ jump_to(icce, temp1);
 481       __ delayed()->nop();
 482     }
 483   }
 484 }
 485 
 486 #ifndef PRODUCT
 487 void trace_method_handle_stub(const char* adaptername,
 488                               oopDesc* mh,
 489                               intptr_t* saved_sp,
 490                               intptr_t* args,
 491                               intptr_t* tracing_fp) {
 492   bool has_mh = (strstr(adaptername, "/static") == NULL &&
 493                  strstr(adaptername, "linkTo") == NULL);    // static linkers don't have MH
 494   const char* mh_reg_name = has_mh ? "G3_mh" : "G3";
 495   tty->print_cr("MH %s %s=" INTPTR_FORMAT " saved_sp=" INTPTR_FORMAT " args=" INTPTR_FORMAT,
 496                 adaptername, mh_reg_name,
 497                 p2i(mh), p2i(saved_sp), p2i(args));
 498 
 499   if (Verbose) {
 500     // dumping last frame with frame::describe
 501 
 502     JavaThread* p = JavaThread::active();
 503 
 504     ResourceMark rm;
 505     PRESERVE_EXCEPTION_MARK; // may not be needed by safer and unexpensive here
 506     FrameValues values;
 507 
 508     // Note: We want to allow trace_method_handle from any call site.
 509     // While trace_method_handle creates a frame, it may be entered
 510     // without a valid return PC in O7 (e.g. not just after a call).
 511     // Walking that frame could lead to failures due to that invalid PC.
 512     // => carefully detect that frame when doing the stack walking
 513 
 514     // walk up to the right frame using the "tracing_fp" argument
 515     intptr_t* cur_sp = StubRoutines::Sparc::flush_callers_register_windows_func()();
 516     frame cur_frame(cur_sp, frame::unpatchable, NULL);
 517 
 518     while (cur_frame.fp() != (intptr_t *)(STACK_BIAS+(uintptr_t)tracing_fp)) {
 519       cur_frame = os::get_sender_for_C_frame(&cur_frame);
 520     }
 521 
 522     // safely create a frame and call frame::describe
 523     intptr_t *dump_sp = cur_frame.sender_sp();
 524     intptr_t *dump_fp = cur_frame.link();
 525 
 526     bool walkable = has_mh; // whether the traced frame shoud be walkable
 527 
 528     // the sender for cur_frame is the caller of trace_method_handle
 529     if (walkable) {
 530       // The previous definition of walkable may have to be refined
 531       // if new call sites cause the next frame constructor to start
 532       // failing. Alternatively, frame constructors could be
 533       // modified to support the current or future non walkable
 534       // frames (but this is more intrusive and is not considered as
 535       // part of this RFE, which will instead use a simpler output).
 536       frame dump_frame = frame(dump_sp,
 537                                cur_frame.sp(), // younger_sp
 538                                false); // no adaptation
 539       dump_frame.describe(values, 1);
 540     } else {
 541       // Robust dump for frames which cannot be constructed from sp/younger_sp
 542       // Add descriptions without building a Java frame to avoid issues
 543       values.describe(-1, dump_fp, "fp for #1 <not parsed, cannot trust pc>");
 544       values.describe(-1, dump_sp, "sp");
 545     }
 546 
 547     bool has_args = has_mh; // whether Gargs is meaningful
 548 
 549     // mark args, if seems valid (may not be valid for some adapters)
 550     if (has_args) {
 551       if ((args >= dump_sp) && (args < dump_fp)) {
 552         values.describe(-1, args, "*G4_args");
 553       }
 554     }
 555 
 556     // mark saved_sp, if seems valid (may not be valid for some adapters)
 557     intptr_t *unbiased_sp = (intptr_t *)(STACK_BIAS+(uintptr_t)saved_sp);
 558     const int ARG_LIMIT = 255, SLOP = 45, UNREASONABLE_STACK_MOVE = (ARG_LIMIT + SLOP);
 559     if ((unbiased_sp >= dump_sp - UNREASONABLE_STACK_MOVE) && (unbiased_sp < dump_fp)) {
 560       values.describe(-1, unbiased_sp, "*saved_sp+STACK_BIAS");
 561     }
 562 
 563     // Note: the unextended_sp may not be correct
 564     tty->print_cr("  stack layout:");
 565     values.print(p);
 566     if (has_mh && oopDesc::is_oop(mh)) {
 567       mh->print();
 568       if (java_lang_invoke_MethodHandle::is_instance(mh)) {
 569         if (java_lang_invoke_MethodHandle::form_offset_in_bytes() != 0)
 570           java_lang_invoke_MethodHandle::form(mh)->print();
 571       }
 572     }
 573   }
 574 }
 575 
 576 void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) {
 577   if (!TraceMethodHandles)  return;
 578   BLOCK_COMMENT("trace_method_handle {");
 579   // save: Gargs, O5_savedSP
 580   __ save_frame(16); // need space for saving required FPU state
 581 
 582   __ set((intptr_t) adaptername, O0);
 583   __ mov(G3_method_handle, O1);
 584   __ mov(I5_savedSP, O2);
 585   __ mov(Gargs, O3);
 586   __ mov(I6, O4); // frame identifier for safe stack walking
 587 
 588   // Save scratched registers that might be needed. Robustness is more
 589   // important than optimizing the saves for this debug only code.
 590 
 591   // save FP result, valid at some call sites (adapter_opt_return_float, ...)
 592   Address d_save(FP, -sizeof(jdouble) + STACK_BIAS);
 593   __ stf(FloatRegisterImpl::D, Ftos_d, d_save);
 594   // Safely save all globals but G2 (handled by call_VM_leaf) and G7
 595   // (OS reserved).
 596   __ mov(G3_method_handle, L3);
 597   __ mov(Gargs, L4);
 598   __ mov(G5_method_type, L5);
 599   __ mov(G6, L6);
 600   __ mov(G1, L1);
 601 
 602   __ call_VM_leaf(L2 /* for G2 */, CAST_FROM_FN_PTR(address, trace_method_handle_stub));
 603 
 604   __ mov(L3, G3_method_handle);
 605   __ mov(L4, Gargs);
 606   __ mov(L5, G5_method_type);
 607   __ mov(L6, G6);
 608   __ mov(L1, G1);
 609   __ ldf(FloatRegisterImpl::D, d_save, Ftos_d);
 610 
 611   __ restore();
 612   BLOCK_COMMENT("} trace_method_handle");
 613 }
 614 #endif // PRODUCT
--- EOF ---