jdk8-mips64-public/hotspot: src/cpu/sparc/vm/methodHandles

src/cpu/sparc/vm/methodHandles_sparc.cpp@1d7922586cf6 (annotated)

src/cpu/sparc/vm/methodHandles_sparc.cpp

Tue, 24 Jul 2012 10:51:00 -0700

author: twisti
date: Tue, 24 Jul 2012 10:51:00 -0700
changeset 3969: 1d7922586cf6
parent 3451: 5dbed2f542ff
child 4037: da91efe96a93
permissions: -rw-r--r--

7023639: JSR 292 method handle invocation needs a fast path for compiled code
6984705: JSR 292 method handle creation should not go through JNI
Summary: remove assembly code for JDK 7 chained method handles
Reviewed-by: jrose, twisti, kvn, mhaupt
Contributed-by: John Rose <john.r.rose@oracle.com>, Christian Thalinger <christian.thalinger@oracle.com>, Michael Haupt <michael.haupt@oracle.com>

 /*
  * Copyright (c) 2008, 2012, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  *
  */
 #include "precompiled.hpp"
 #include "interpreter/interpreter.hpp"
 #include "memory/allocation.inline.hpp"
 #include "prims/methodHandles.hpp"
 #define __ _masm->
 #ifdef PRODUCT
 #define BLOCK_COMMENT(str) /* nothing */
 #define STOP(error) stop(error)
 #else
 #define BLOCK_COMMENT(str) __ block_comment(str)
 #define STOP(error) block_comment(error); __ stop(error)
 #endif
 #define BIND(label) bind(label); BLOCK_COMMENT(#label ":")
 // Workaround for C++ overloading nastiness on '0' for RegisterOrConstant.
 static RegisterOrConstant constant(int value) {
   return RegisterOrConstant(value);
 }
 void MethodHandles::load_klass_from_Class(MacroAssembler* _masm, Register klass_reg, Register temp_reg, Register temp2_reg) {
   if (VerifyMethodHandles)
     verify_klass(_masm, klass_reg, SystemDictionaryHandles::Class_klass(), temp_reg, temp2_reg,
                  "MH argument is a Class");
   __ load_heap_oop(Address(klass_reg, java_lang_Class::klass_offset_in_bytes()), klass_reg);
 }
 #ifdef ASSERT
 static int check_nonzero(const char* xname, int x) {
   assert(x != 0, err_msg("%s should be nonzero", xname));
   return x;
 }
 #define NONZERO(x) check_nonzero(#x, x)
 #else //ASSERT
 #define NONZERO(x) (x)
 #endif //ASSERT
 #ifdef ASSERT
 void MethodHandles::verify_klass(MacroAssembler* _masm,
                                  Register obj_reg, KlassHandle klass,
                                  Register temp_reg, Register temp2_reg,
                                  const char* error_message) {
   oop* klass_addr = klass.raw_value();
   assert(klass_addr >= SystemDictionaryHandles::Object_klass().raw_value() &&
          klass_addr <= SystemDictionaryHandles::Long_klass().raw_value(),
          "must be one of the SystemDictionaryHandles");
   bool did_save = false;
   if (temp_reg == noreg || temp2_reg == noreg) {
     temp_reg = L1;
     temp2_reg = L2;
     __ save_frame_and_mov(0, obj_reg, L0);
     obj_reg = L0;
     did_save = true;
   }
   Label L_ok, L_bad;
   BLOCK_COMMENT("verify_klass {");
   __ verify_oop(obj_reg);
   __ br_null_short(obj_reg, Assembler::pn, L_bad);
   __ load_klass(obj_reg, temp_reg);
   __ set(ExternalAddress(klass_addr), temp2_reg);
   __ ld_ptr(Address(temp2_reg, 0), temp2_reg);
   __ cmp_and_brx_short(temp_reg, temp2_reg, Assembler::equal, Assembler::pt, L_ok);
   intptr_t super_check_offset = klass->super_check_offset();
   __ ld_ptr(Address(temp_reg, super_check_offset), temp_reg);
   __ set(ExternalAddress(klass_addr), temp2_reg);
   __ ld_ptr(Address(temp2_reg, 0), temp2_reg);
   __ cmp_and_brx_short(temp_reg, temp2_reg, Assembler::equal, Assembler::pt, L_ok);
   __ BIND(L_bad);
   if (did_save)  __ restore();
   __ STOP(error_message);
   __ BIND(L_ok);
   if (did_save)  __ restore();
   BLOCK_COMMENT("} verify_klass");
 }
 void MethodHandles::verify_ref_kind(MacroAssembler* _masm, int ref_kind, Register member_reg, Register temp) {
   Label L;
   BLOCK_COMMENT("verify_ref_kind {");
   __ lduw(Address(member_reg, NONZERO(java_lang_invoke_MemberName::flags_offset_in_bytes())), temp);
   __ srl( temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT, temp);
   __ and3(temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK,  temp);
   __ cmp_and_br_short(temp, ref_kind, Assembler::equal, Assembler::pt, L);
   { char* buf = NEW_C_HEAP_ARRAY(char, 100, mtInternal);
     jio_snprintf(buf, 100, "verify_ref_kind expected %x", ref_kind);
     if (ref_kind == JVM_REF_invokeVirtual ||
         ref_kind == JVM_REF_invokeSpecial)
       // could do this for all ref_kinds, but would explode assembly code size
       trace_method_handle(_masm, buf);
     __ STOP(buf);
   }
   BLOCK_COMMENT("} verify_ref_kind");
   __ bind(L);
 }
 #endif // ASSERT
 void MethodHandles::jump_from_method_handle(MacroAssembler* _masm, Register method, Register target, Register temp,
                                             bool for_compiler_entry) {
   assert(method == G5_method, "interpreter calling convention");
   __ verify_oop(method);
   if (!for_compiler_entry && JvmtiExport::can_post_interpreter_events()) {
     Label run_compiled_code;
     // JVMTI events, such as single-stepping, are implemented partly by avoiding running
     // compiled code in threads for which the event is enabled.  Check here for
     // interp_only_mode if these events CAN be enabled.
     __ verify_thread();
     const Address interp_only(G2_thread, JavaThread::interp_only_mode_offset());
     __ ld(interp_only, temp);
     __ cmp_and_br_short(temp, 0, Assembler::zero, Assembler::pt, run_compiled_code);
     __ ld_ptr(G5_method, in_bytes(methodOopDesc::interpreter_entry_offset()), target);
     __ jmp(target, 0);
     __ delayed()->nop();
     __ BIND(run_compiled_code);
     // Note: we could fill some delay slots here, but
     // it doesn't matter, since this is interpreter code.
   }
   const ByteSize entry_offset = for_compiler_entry ? methodOopDesc::from_compiled_offset() :
                                                      methodOopDesc::from_interpreted_offset();
   __ ld_ptr(G5_method, in_bytes(entry_offset), target);
   __ jmp(target, 0);
   __ delayed()->nop();
 }
 void MethodHandles::jump_to_lambda_form(MacroAssembler* _masm,
                                         Register recv, Register method_temp,
                                         Register temp2, Register temp3,
                                         bool for_compiler_entry) {
   BLOCK_COMMENT("jump_to_lambda_form {");
   // This is the initial entry point of a lazy method handle.
   // After type checking, it picks up the invoker from the LambdaForm.
   assert_different_registers(recv, method_temp, temp2, temp3);
   assert(method_temp == G5_method, "required register for loading method");
   //NOT_PRODUCT({ FlagSetting fs(TraceMethodHandles, true); trace_method_handle(_masm, "LZMH"); });
   // Load the invoker, as MH -> MH.form -> LF.vmentry
   __ verify_oop(recv);
   __ load_heap_oop(Address(recv,        NONZERO(java_lang_invoke_MethodHandle::form_offset_in_bytes())),       method_temp);
   __ verify_oop(method_temp);
   __ load_heap_oop(Address(method_temp, NONZERO(java_lang_invoke_LambdaForm::vmentry_offset_in_bytes())), method_temp);
   __ verify_oop(method_temp);
   // the following assumes that a methodOop is normally compressed in the vmtarget field:
   __ load_heap_oop(Address(method_temp, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes())),     method_temp);
   __ verify_oop(method_temp);
   if (VerifyMethodHandles && !for_compiler_entry) {
     // make sure recv is already on stack
     __ load_sized_value(Address(method_temp, methodOopDesc::size_of_parameters_offset()),
                         temp2,
                         sizeof(u2), /*is_signed*/ false);
     // assert(sizeof(u2) == sizeof(methodOopDesc::_size_of_parameters), "");
     Label L;
     __ ld_ptr(__ argument_address(temp2, temp2, -1), temp2);
     __ cmp_and_br_short(temp2, recv, Assembler::equal, Assembler::pt, L);
     __ STOP("receiver not on stack");
     __ BIND(L);
   }
   jump_from_method_handle(_masm, method_temp, temp2, temp3, for_compiler_entry);
   BLOCK_COMMENT("} jump_to_lambda_form");
 }
 // Code generation
 address MethodHandles::generate_method_handle_interpreter_entry(MacroAssembler* _masm,
                                                                 vmIntrinsics::ID iid) {
   const bool not_for_compiler_entry = false;  // this is the interpreter entry
   assert(is_signature_polymorphic(iid), "expected invoke iid");
   if (iid == vmIntrinsics::_invokeGeneric ||
       iid == vmIntrinsics::_compiledLambdaForm) {
     // Perhaps surprisingly, the symbolic references visible to Java are not directly used.
     // They are linked to Java-generated adapters via MethodHandleNatives.linkMethod.
     // They all allow an appendix argument.
     __ should_not_reach_here();           // empty stubs make SG sick
     return NULL;
   }
   // I5_savedSP/O5_savedSP: sender SP (must preserve; see prepare_to_jump_from_interpreted)
   // G5_method:  methodOop
   // G4 (Gargs): incoming argument list (must preserve)
   // O0: used as temp to hold mh or receiver
   // O1, O4: garbage temps, blown away
   Register O1_scratch    = O1;
   Register O4_param_size = O4;   // size of parameters
   address code_start = __ pc();
   // here's where control starts out:
   __ align(CodeEntryAlignment);
   address entry_point = __ pc();
   if (VerifyMethodHandles) {
     Label L;
     BLOCK_COMMENT("verify_intrinsic_id {");
     __ ldub(Address(G5_method, methodOopDesc::intrinsic_id_offset_in_bytes()), O1_scratch);
     __ cmp_and_br_short(O1_scratch, (int) iid, Assembler::equal, Assembler::pt, L);
     if (iid == vmIntrinsics::_linkToVirtual ||
         iid == vmIntrinsics::_linkToSpecial) {
       // could do this for all kinds, but would explode assembly code size
       trace_method_handle(_masm, "bad methodOop::intrinsic_id");
     }
     __ STOP("bad methodOop::intrinsic_id");
     __ bind(L);
     BLOCK_COMMENT("} verify_intrinsic_id");
   }
   // First task:  Find out how big the argument list is.
   Address O4_first_arg_addr;
   int ref_kind = signature_polymorphic_intrinsic_ref_kind(iid);
   assert(ref_kind != 0 || iid == vmIntrinsics::_invokeBasic, "must be _invokeBasic or a linkTo intrinsic");
   if (ref_kind == 0 || MethodHandles::ref_kind_has_receiver(ref_kind)) {
     __ load_sized_value(Address(G5_method, methodOopDesc::size_of_parameters_offset()),
                         O4_param_size,
                         sizeof(u2), /*is_signed*/ false);
     // assert(sizeof(u2) == sizeof(methodOopDesc::_size_of_parameters), "");
     O4_first_arg_addr = __ argument_address(O4_param_size, O4_param_size, -1);
   } else {
     DEBUG_ONLY(O4_param_size = noreg);
   }
   Register O0_mh = noreg;
   if (!is_signature_polymorphic_static(iid)) {
     __ ld_ptr(O4_first_arg_addr, O0_mh = O0);
     DEBUG_ONLY(O4_param_size = noreg);
   }
   // O4_first_arg_addr is live!
   if (TraceMethodHandles) {
     const char* name = vmIntrinsics::name_at(iid);
     if (*name == '_')  name += 1;
     const size_t len = strlen(name) + 50;
     char* qname = NEW_C_HEAP_ARRAY(char, len, mtInternal);
     const char* suffix = "";
     if (vmIntrinsics::method_for(iid) == NULL ||
         !vmIntrinsics::method_for(iid)->access_flags().is_public()) {
       if (is_signature_polymorphic_static(iid))
         suffix = "/static";
       else
         suffix = "/private";
     }
     jio_snprintf(qname, len, "MethodHandle::interpreter_entry::%s%s", name, suffix);
     if (O0_mh != noreg)
       __ mov(O0_mh, G3_method_handle);  // make stub happy
     trace_method_handle(_masm, qname);
   }
   if (iid == vmIntrinsics::_invokeBasic) {
     generate_method_handle_dispatch(_masm, iid, O0_mh, noreg, not_for_compiler_entry);
   } else {
     // Adjust argument list by popping the trailing MemberName argument.
     Register O0_recv = noreg;
     if (MethodHandles::ref_kind_has_receiver(ref_kind)) {
       // Load the receiver (not the MH; the actual MemberName's receiver) up from the interpreter stack.
       __ ld_ptr(O4_first_arg_addr, O0_recv = O0);
       DEBUG_ONLY(O4_param_size = noreg);
     }
     Register G5_member = G5_method;  // MemberName ptr; incoming method ptr is dead now
     __ ld_ptr(__ argument_address(constant(0)), G5_member);
     __ add(Gargs, Interpreter::stackElementSize, Gargs);
     generate_method_handle_dispatch(_masm, iid, O0_recv, G5_member, not_for_compiler_entry);
   }
   if (PrintMethodHandleStubs) {
     address code_end = __ pc();
     tty->print_cr("--------");
     tty->print_cr("method handle interpreter entry for %s", vmIntrinsics::name_at(iid));
     Disassembler::decode(code_start, code_end);
     tty->cr();
   }
   return entry_point;
 }
 void MethodHandles::generate_method_handle_dispatch(MacroAssembler* _masm,
                                                     vmIntrinsics::ID iid,
                                                     Register receiver_reg,
                                                     Register member_reg,
                                                     bool for_compiler_entry) {
   assert(is_signature_polymorphic(iid), "expected invoke iid");
   // temps used in this code are not used in *either* compiled or interpreted calling sequences
   Register temp1 = (for_compiler_entry ? G1_scratch : O1);
   Register temp2 = (for_compiler_entry ? G4_scratch : O4);
   Register temp3 = G3_scratch;
   Register temp4 = (for_compiler_entry ? noreg      : O2);
   if (for_compiler_entry) {
     assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : O0), "only valid assignment");
     assert_different_registers(temp1,      O0, O1, O2, O3, O4, O5);
     assert_different_registers(temp2,      O0, O1, O2, O3, O4, O5);
     assert_different_registers(temp3,      O0, O1, O2, O3, O4, O5);
     assert_different_registers(temp4,      O0, O1, O2, O3, O4, O5);
   }
   if (receiver_reg != noreg)  assert_different_registers(temp1, temp2, temp3, temp4, receiver_reg);
   if (member_reg   != noreg)  assert_different_registers(temp1, temp2, temp3, temp4, member_reg);
   if (!for_compiler_entry)    assert_different_registers(temp1, temp2, temp3, temp4, O5_savedSP);  // don't trash lastSP
   if (iid == vmIntrinsics::_invokeBasic) {
     // indirect through MH.form.vmentry.vmtarget
     jump_to_lambda_form(_masm, receiver_reg, G5_method, temp2, temp3, for_compiler_entry);
   } else {
     // The method is a member invoker used by direct method handles.
     if (VerifyMethodHandles) {
       // make sure the trailing argument really is a MemberName (caller responsibility)
       verify_klass(_masm, member_reg, SystemDictionaryHandles::MemberName_klass(),
                    temp1, temp2,
                    "MemberName required for invokeVirtual etc.");
     }
     Address member_clazz(    member_reg, NONZERO(java_lang_invoke_MemberName::clazz_offset_in_bytes()));
     Address member_vmindex(  member_reg, NONZERO(java_lang_invoke_MemberName::vmindex_offset_in_bytes()));
     Address member_vmtarget( member_reg, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes()));
     Register temp1_recv_klass = temp1;
     if (iid != vmIntrinsics::_linkToStatic) {
       __ verify_oop(receiver_reg);
       if (iid == vmIntrinsics::_linkToSpecial) {
         // Don't actually load the klass; just null-check the receiver.
         __ null_check(receiver_reg);
       } else {
         // load receiver klass itself
         __ null_check(receiver_reg, oopDesc::klass_offset_in_bytes());
         __ load_klass(receiver_reg, temp1_recv_klass);
         __ verify_oop(temp1_recv_klass);
       }
       BLOCK_COMMENT("check_receiver {");
       // The receiver for the MemberName must be in receiver_reg.
       // Check the receiver against the MemberName.clazz
       if (VerifyMethodHandles && iid == vmIntrinsics::_linkToSpecial) {
         // Did not load it above...
         __ load_klass(receiver_reg, temp1_recv_klass);
         __ verify_oop(temp1_recv_klass);
       }
       if (VerifyMethodHandles && iid != vmIntrinsics::_linkToInterface) {
         Label L_ok;
         Register temp2_defc = temp2;
         __ load_heap_oop(member_clazz, temp2_defc);
         load_klass_from_Class(_masm, temp2_defc, temp3, temp4);
         __ verify_oop(temp2_defc);
         __ check_klass_subtype(temp1_recv_klass, temp2_defc, temp3, temp4, L_ok);
         // If we get here, the type check failed!
         __ STOP("receiver class disagrees with MemberName.clazz");
         __ bind(L_ok);
       }
       BLOCK_COMMENT("} check_receiver");
     }
     if (iid == vmIntrinsics::_linkToSpecial ||
         iid == vmIntrinsics::_linkToStatic) {
       DEBUG_ONLY(temp1_recv_klass = noreg);  // these guys didn't load the recv_klass
     }
     // Live registers at this point:
     //  member_reg - MemberName that was the trailing argument
     //  temp1_recv_klass - klass of stacked receiver, if needed
     //  O5_savedSP - interpreter linkage (if interpreted)
     //  O0..O7,G1,G4 - compiler arguments (if compiled)
     bool method_is_live = false;
     switch (iid) {
     case vmIntrinsics::_linkToSpecial:
       if (VerifyMethodHandles) {
         verify_ref_kind(_masm, JVM_REF_invokeSpecial, member_reg, temp3);
       }
       __ load_heap_oop(member_vmtarget, G5_method);
       method_is_live = true;
       break;
     case vmIntrinsics::_linkToStatic:
       if (VerifyMethodHandles) {
         verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp3);
       }
       __ load_heap_oop(member_vmtarget, G5_method);
       method_is_live = true;
       break;
     case vmIntrinsics::_linkToVirtual:
     {
       // same as TemplateTable::invokevirtual,
       // minus the CP setup and profiling:
       if (VerifyMethodHandles) {
         verify_ref_kind(_masm, JVM_REF_invokeVirtual, member_reg, temp3);
       }
       // pick out the vtable index from the MemberName, and then we can discard it:
       Register temp2_index = temp2;
       __ ld_ptr(member_vmindex, temp2_index);
       if (VerifyMethodHandles) {
         Label L_index_ok;
         __ cmp_and_br_short(temp2_index, (int) 0, Assembler::greaterEqual, Assembler::pn, L_index_ok);
         __ STOP("no virtual index");
         __ BIND(L_index_ok);
       }
       // Note:  The verifier invariants allow us to ignore MemberName.clazz and vmtarget
       // at this point.  And VerifyMethodHandles has already checked clazz, if needed.
       // get target methodOop & entry point
       __ lookup_virtual_method(temp1_recv_klass, temp2_index, G5_method);
       method_is_live = true;
       break;
     }
     case vmIntrinsics::_linkToInterface:
     {
       // same as TemplateTable::invokeinterface
       // (minus the CP setup and profiling, with different argument motion)
       if (VerifyMethodHandles) {
         verify_ref_kind(_masm, JVM_REF_invokeInterface, member_reg, temp3);
       }
       Register temp3_intf = temp3;
       __ load_heap_oop(member_clazz, temp3_intf);
       load_klass_from_Class(_masm, temp3_intf, temp2, temp4);
       __ verify_oop(temp3_intf);
       Register G5_index = G5_method;
       __ ld_ptr(member_vmindex, G5_index);
       if (VerifyMethodHandles) {
         Label L;
         __ cmp_and_br_short(G5_index, 0, Assembler::greaterEqual, Assembler::pt, L);
         __ STOP("invalid vtable index for MH.invokeInterface");
         __ bind(L);
       }
       // given intf, index, and recv klass, dispatch to the implementation method
       Label L_no_such_interface;
       Register no_sethi_temp = noreg;
       __ lookup_interface_method(temp1_recv_klass, temp3_intf,
                                  // note: next two args must be the same:
                                  G5_index, G5_method,
                                  temp2, no_sethi_temp,
                                  L_no_such_interface);
       __ verify_oop(G5_method);
       jump_from_method_handle(_masm, G5_method, temp2, temp3, for_compiler_entry);
       __ bind(L_no_such_interface);
       AddressLiteral icce(StubRoutines::throw_IncompatibleClassChangeError_entry());
       __ jump_to(icce, temp3);
       __ delayed()->nop();
       break;
     }
     default:
       fatal(err_msg("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid)));
       break;
     }
     if (method_is_live) {
       // live at this point:  G5_method, O5_savedSP (if interpreted)
       // After figuring out which concrete method to call, jump into it.
       // Note that this works in the interpreter with no data motion.
       // But the compiled version will require that rcx_recv be shifted out.
       __ verify_oop(G5_method);
       jump_from_method_handle(_masm, G5_method, temp1, temp3, for_compiler_entry);
     }
   }
 }
 #ifndef PRODUCT
 void trace_method_handle_stub(const char* adaptername,
                               oopDesc* mh,
                               intptr_t* saved_sp,
                               intptr_t* args,
                               intptr_t* tracing_fp) {
   bool has_mh = (strstr(adaptername, "/static") == NULL &&
                  strstr(adaptername, "linkTo") == NULL);    // static linkers don't have MH
   const char* mh_reg_name = has_mh ? "G3_mh" : "G3";
   tty->print_cr("MH %s %s="INTPTR_FORMAT " saved_sp=" INTPTR_FORMAT " args=" INTPTR_FORMAT,
                 adaptername, mh_reg_name,
                 (intptr_t) mh, saved_sp, args);
   if (Verbose) {
     // dumping last frame with frame::describe
     JavaThread* p = JavaThread::active();
     ResourceMark rm;
     PRESERVE_EXCEPTION_MARK; // may not be needed by safer and unexpensive here
     FrameValues values;
     // Note: We want to allow trace_method_handle from any call site.
     // While trace_method_handle creates a frame, it may be entered
     // without a valid return PC in O7 (e.g. not just after a call).
     // Walking that frame could lead to failures due to that invalid PC.
     // => carefully detect that frame when doing the stack walking
     // walk up to the right frame using the "tracing_fp" argument
     intptr_t* cur_sp = StubRoutines::Sparc::flush_callers_register_windows_func()();
     frame cur_frame(cur_sp, frame::unpatchable, NULL);
     while (cur_frame.fp() != (intptr_t *)(STACK_BIAS+(uintptr_t)tracing_fp)) {
       cur_frame = os::get_sender_for_C_frame(&cur_frame);
     }
     // safely create a frame and call frame::describe
     intptr_t *dump_sp = cur_frame.sender_sp();
     intptr_t *dump_fp = cur_frame.link();
     bool walkable = has_mh; // whether the traced frame shoud be walkable
     // the sender for cur_frame is the caller of trace_method_handle
     if (walkable) {
       // The previous definition of walkable may have to be refined
       // if new call sites cause the next frame constructor to start
       // failing. Alternatively, frame constructors could be
       // modified to support the current or future non walkable
       // frames (but this is more intrusive and is not considered as
       // part of this RFE, which will instead use a simpler output).
       frame dump_frame = frame(dump_sp,
                                cur_frame.sp(), // younger_sp
                                false); // no adaptation
       dump_frame.describe(values, 1);
     } else {
       // Robust dump for frames which cannot be constructed from sp/younger_sp
       // Add descriptions without building a Java frame to avoid issues
       values.describe(-1, dump_fp, "fp for #1 <not parsed, cannot trust pc>");
       values.describe(-1, dump_sp, "sp");
     }
     bool has_args = has_mh; // whether Gargs is meaningful
     // mark args, if seems valid (may not be valid for some adapters)
     if (has_args) {
       if ((args >= dump_sp) && (args < dump_fp)) {
         values.describe(-1, args, "*G4_args");
       }
     }
     // mark saved_sp, if seems valid (may not be valid for some adapters)
     intptr_t *unbiased_sp = (intptr_t *)(STACK_BIAS+(uintptr_t)saved_sp);
     const int ARG_LIMIT = 255, SLOP = 45, UNREASONABLE_STACK_MOVE = (ARG_LIMIT + SLOP);
     if ((unbiased_sp >= dump_sp - UNREASONABLE_STACK_MOVE) && (unbiased_sp < dump_fp)) {
       values.describe(-1, unbiased_sp, "*saved_sp+STACK_BIAS");
     }
     // Note: the unextended_sp may not be correct
     tty->print_cr("  stack layout:");
     values.print(p);
     if (has_mh && mh->is_oop()) {
       mh->print();
       if (java_lang_invoke_MethodHandle::is_instance(mh)) {
         if (java_lang_invoke_MethodHandle::form_offset_in_bytes() != 0)
           java_lang_invoke_MethodHandle::form(mh)->print();
       }
     }
   }
 }
 void MethodHandles::trace_method_handle(MacroAssembler* _masm, const char* adaptername) {
   if (!TraceMethodHandles)  return;
   BLOCK_COMMENT("trace_method_handle {");
   // save: Gargs, O5_savedSP
   __ save_frame(16); // need space for saving required FPU state
   __ set((intptr_t) adaptername, O0);
   __ mov(G3_method_handle, O1);
   __ mov(I5_savedSP, O2);
   __ mov(Gargs, O3);
   __ mov(I6, O4); // frame identifier for safe stack walking
   // Save scratched registers that might be needed. Robustness is more
   // important than optimizing the saves for this debug only code.
   // save FP result, valid at some call sites (adapter_opt_return_float, ...)
   Address d_save(FP, -sizeof(jdouble) + STACK_BIAS);
   __ stf(FloatRegisterImpl::D, Ftos_d, d_save);
   // Safely save all globals but G2 (handled by call_VM_leaf) and G7
   // (OS reserved).
   __ mov(G3_method_handle, L3);
   __ mov(Gargs, L4);
   __ mov(G5_method_type, L5);
   __ mov(G6, L6);
   __ mov(G1, L1);
   __ call_VM_leaf(L2 /* for G2 */, CAST_FROM_FN_PTR(address, trace_method_handle_stub));
   __ mov(L3, G3_method_handle);
   __ mov(L4, Gargs);
   __ mov(L5, G5_method_type);
   __ mov(L6, G6);
   __ mov(L1, G1);
   __ ldf(FloatRegisterImpl::D, d_save, Ftos_d);
   __ restore();
   BLOCK_COMMENT("} trace_method_handle");
 }
 #endif // PRODUCT

Mercurial > jdk8-mips64-public > hotspot / annotate

src/cpu/sparc/vm/methodHandles_sparc.cpp@1d7922586cf6 (annotated)

src/cpu/sparc/vm/methodHandles_sparc.cpp