예제 #1
0
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");
  Register temp1 = (for_compiler_entry ? R25_tmp5 : R7);
  Register temp2 = (for_compiler_entry ? R22_tmp2 : R8);
  Register temp3 = (for_compiler_entry ? R23_tmp3 : R9);
  Register temp4 = (for_compiler_entry ? R24_tmp4 : R10);
  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 (iid == vmIntrinsics::_invokeBasic) {
    // indirect through MH.form.vmentry.vmtarget
    jump_to_lambda_form(_masm, receiver_reg, R19_method, temp1, temp2, 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, SystemDictionary::WK_KLASS_ENUM_NAME(MemberName_klass),
                   temp1, temp2,
                   "MemberName required for invokeVirtual etc.");
    }

    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_throw(receiver_reg, -1, temp1, EXCEPTION_ENTRY);
      } else {
        // load receiver klass itself
        __ null_check_throw(receiver_reg, oopDesc::klass_offset_in_bytes(), temp1, EXCEPTION_ENTRY);
        __ load_klass(temp1_recv_klass, receiver_reg);
        __ verify_klass_ptr(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(temp1_recv_klass, receiver_reg);
        __ verify_klass_ptr(temp1_recv_klass);
      }
      if (VerifyMethodHandles && iid != vmIntrinsics::_linkToInterface) {
        Label L_ok;
        Register temp2_defc = temp2;
        __ load_heap_oop_not_null(temp2_defc, NONZERO(java_lang_invoke_MemberName::clazz_offset_in_bytes()), member_reg, temp3);
        load_klass_from_Class(_masm, temp2_defc, temp3, temp4);
        __ verify_klass_ptr(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..O5 - compiler arguments (if compiled)

    Label L_incompatible_class_change_error;
    switch (iid) {
    case vmIntrinsics::_linkToSpecial:
      if (VerifyMethodHandles) {
        verify_ref_kind(_masm, JVM_REF_invokeSpecial, member_reg, temp2);
      }
      __ ld(R19_method, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes()), member_reg);
      break;

    case vmIntrinsics::_linkToStatic:
      if (VerifyMethodHandles) {
        verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp2);
      }
      __ ld(R19_method, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes()), member_reg);
      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, temp2);
      }

      // pick out the vtable index from the MemberName, and then we can discard it:
      Register temp2_index = temp2;
      __ ld(temp2_index, NONZERO(java_lang_invoke_MemberName::vmindex_offset_in_bytes()), member_reg);

      if (VerifyMethodHandles) {
        Label L_index_ok;
        __ cmpdi(CCR1, temp2_index, 0);
        __ bge(CCR1, 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 Method* & entry point
      __ lookup_virtual_method(temp1_recv_klass, temp2_index, R19_method);
      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, temp2);
      }

      Register temp2_intf = temp2;
      __ load_heap_oop_not_null(temp2_intf, NONZERO(java_lang_invoke_MemberName::clazz_offset_in_bytes()), member_reg, temp3);
      load_klass_from_Class(_masm, temp2_intf, temp3, temp4);
      __ verify_klass_ptr(temp2_intf);

      Register vtable_index = R19_method;
      __ ld(vtable_index, NONZERO(java_lang_invoke_MemberName::vmindex_offset_in_bytes()), member_reg);
      if (VerifyMethodHandles) {
        Label L_index_ok;
        __ cmpdi(CCR1, vtable_index, 0);
        __ bge(CCR1, L_index_ok);
        __ stop("invalid vtable index for MH.invokeInterface");
        __ BIND(L_index_ok);
      }

      // given intf, index, and recv klass, dispatch to the implementation method
      __ lookup_interface_method(temp1_recv_klass, temp2_intf,
                                 // note: next two args must be the same:
                                 vtable_index, R19_method,
                                 temp3, temp4,
                                 L_incompatible_class_change_error);
      break;
    }

    default:
      fatal(err_msg_res("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid)));
      break;
    }

    // Live at this point:
    //   R19_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_method_ptr(R19_method);
    jump_from_method_handle(_masm, R19_method, temp1, temp2, for_compiler_entry);

    if (iid == vmIntrinsics::_linkToInterface) {
      __ BIND(L_incompatible_class_change_error);
      __ load_const_optimized(temp1, StubRoutines::throw_IncompatibleClassChangeError_entry());
      __ mtctr(temp1);
      __ bctr();
    }
  }
}
예제 #2
0
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 = r10;
  Register temp2 = r11;
  Register temp3 = r14;  // r13 is live by this point: it contains the sender SP
  if (for_compiler_entry) {
    assert(receiver_reg == (iid == vmIntrinsics::_linkToStatic ? noreg : j_rarg0), "only valid assignment");
    assert_different_registers(temp1,        j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5, j_rarg6, j_rarg7);
    assert_different_registers(temp2,        j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5, j_rarg6, j_rarg7);
    assert_different_registers(temp3,        j_rarg0, j_rarg1, j_rarg2, j_rarg3, j_rarg4, j_rarg5, j_rarg6, j_rarg7);
  }

  assert_different_registers(temp1, temp2, temp3, receiver_reg);
  assert_different_registers(temp1, temp2, temp3, member_reg);

  if (iid == vmIntrinsics::_invokeBasic) {
    // indirect through MH.form.vmentry.vmtarget
    jump_to_lambda_form(_masm, receiver_reg, rmethod, temp1, 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, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_invoke_MemberName),
                   "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(temp1_recv_klass, receiver_reg);
        __ verify_klass_ptr(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(temp1_recv_klass, receiver_reg);
        __ verify_klass_ptr(temp1_recv_klass);
      }
      if (VerifyMethodHandles && iid != vmIntrinsics::_linkToInterface) {
        Label L_ok;
        Register temp2_defc = temp2;
        __ load_heap_oop(temp2_defc, member_clazz);
        load_klass_from_Class(_masm, temp2_defc);
        __ verify_klass_ptr(temp2_defc);
        __ check_klass_subtype(temp1_recv_klass, temp2_defc, temp3, L_ok);
        // If we get here, the type check failed!
        __ hlt(0);
        // __ 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
    //  r13 - interpreter linkage (if interpreted)  ??? FIXME
    //  r1 ... r0 - compiler arguments (if compiled)

    Label L_incompatible_class_change_error;
    switch (iid) {
    case vmIntrinsics::_linkToSpecial:
      if (VerifyMethodHandles) {
        verify_ref_kind(_masm, JVM_REF_invokeSpecial, member_reg, temp3);
      }
      __ ldr(rmethod, member_vmtarget);
      break;

    case vmIntrinsics::_linkToStatic:
      if (VerifyMethodHandles) {
        verify_ref_kind(_masm, JVM_REF_invokeStatic, member_reg, temp3);
      }
      __ ldr(rmethod, member_vmtarget);
      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;
      __ ldr(temp2_index, member_vmindex);

      if (VerifyMethodHandles) {
        Label L_index_ok;
        __ cmpw(temp2_index, 0U);
        __ br(Assembler::GE, L_index_ok);
        __ hlt(0);
        __ 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 Method* & entry point
      __ lookup_virtual_method(temp1_recv_klass, temp2_index, rmethod);
      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(temp3_intf, member_clazz);
      load_klass_from_Class(_masm, temp3_intf);
      __ verify_klass_ptr(temp3_intf);

      Register rindex = rmethod;
      __ ldr(rindex, member_vmindex);
      if (VerifyMethodHandles) {
        Label L;
        __ cmpw(rindex, 0U);
        __ br(Assembler::GE, L);
        __ hlt(0);
        __ bind(L);
      }

      // given intf, index, and recv klass, dispatch to the implementation method
      __ lookup_interface_method(temp1_recv_klass, temp3_intf,
                                 // note: next two args must be the same:
                                 rindex, rmethod,
                                 temp2,
                                 L_incompatible_class_change_error);
      break;
    }

    default:
      fatal("unexpected intrinsic %d: %s", iid, vmIntrinsics::name_at(iid));
      break;
    }

    // live at this point:  rmethod, r13 (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 r2_recv be shifted out.
    __ verify_method_ptr(rmethod);
    jump_from_method_handle(_masm, rmethod, temp1, for_compiler_entry);
    if (iid == vmIntrinsics::_linkToInterface) {
      __ bind(L_incompatible_class_change_error);
      __ far_jump(RuntimeAddress(StubRoutines::throw_IncompatibleClassChangeError_entry()));
    }
  }
}