Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.

  * Copyright 2012, 2013 SAP AG. 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 "asm/macroAssembler.inline.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.

 inline 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, SystemDictionary::WK_KLASS_ENUM_NAME(java_lang_Class), temp_reg, temp2_reg,

                  "MH argument is a Class");

   __ ld(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, SystemDictionary::WKID klass_id,

                                  Register temp_reg, Register temp2_reg,

                                  const char* error_message) {

   Klass** klass_addr = SystemDictionary::well_known_klass_addr(klass_id);

   KlassHandle klass = SystemDictionary::well_known_klass(klass_id);

   Label L_ok, L_bad;

   BLOCK_COMMENT("verify_klass {");

   __ verify_oop(obj_reg);

   __ cmpdi(CCR0, obj_reg, 0);

   __ beq(CCR0, L_bad);

   __ load_klass(temp_reg, obj_reg);

   __ load_const_optimized(temp2_reg, (address) klass_addr);

   __ ld(temp2_reg, 0, temp2_reg);

   __ cmpd(CCR0, temp_reg, temp2_reg);

   __ beq(CCR0, L_ok);

   __ ld(temp_reg, klass->super_check_offset(), temp_reg);

   __ cmpd(CCR0, temp_reg, temp2_reg);

   __ beq(CCR0, L_ok);

   __ BIND(L_bad);

   __ stop(error_message);

   __ BIND(L_ok);

   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 {");

   __ load_sized_value(temp, NONZERO(java_lang_invoke_MemberName::flags_offset_in_bytes()), member_reg,

                       sizeof(u4), /*is_signed*/ false);

   // assert(sizeof(u4) == sizeof(java.lang.invoke.MemberName.flags), "");

   __ srwi( temp, temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_SHIFT);

   __ andi(temp, temp, java_lang_invoke_MemberName::MN_REFERENCE_KIND_MASK);

   __ cmpwi(CCR1, temp, ref_kind);

   __ beq(CCR1, 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 == R19_method, "interpreter calling convention");

   assert_different_registers(method, target, temp);

   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();

     __ lwz(temp, in_bytes(JavaThread::interp_only_mode_offset()), R16_thread);

     __ cmplwi(CCR0, temp, 0);

     __ beq(CCR0, run_compiled_code);

     __ ld(target, in_bytes(Method::interpreter_entry_offset()), R19_method);

     __ mtctr(target);

     __ bctr();

     __ BIND(run_compiled_code);

   }

   const ByteSize entry_offset = for_compiler_entry ? Method::from_compiled_offset() :

                                                      Method::from_interpreted_offset();

   __ ld(target, in_bytes(entry_offset), R19_method);

   __ mtctr(target);

   __ bctr();

 }

 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 is only passed on

   assert(method_temp == R19_method, "required register for loading method");

   // Load the invoker, as MH -> MH.form -> LF.vmentry

   __ verify_oop(recv);

   __ load_heap_oop_not_null(method_temp, NONZERO(java_lang_invoke_MethodHandle::form_offset_in_bytes()), recv);

   __ verify_oop(method_temp);

   __ load_heap_oop_not_null(method_temp, NONZERO(java_lang_invoke_LambdaForm::vmentry_offset_in_bytes()), method_temp);

   __ verify_oop(method_temp);

   // the following assumes that a Method* is normally compressed in the vmtarget field:

   __ ld(method_temp, NONZERO(java_lang_invoke_MemberName::vmtarget_offset_in_bytes()), method_temp);

   if (VerifyMethodHandles && !for_compiler_entry) {

     // make sure recv is already on stack

     __ ld(temp2, in_bytes(Method::const_offset()), method_temp);

     __ load_sized_value(temp2, in_bytes(ConstMethod::size_of_parameters_offset()), temp2,

                         sizeof(u2), /*is_signed*/ false);

     // assert(sizeof(u2) == sizeof(ConstMethod::_size_of_parameters), "");

     Label L;

     __ ld(temp2, __ argument_offset(temp2, temp2, 0), R17_tos);

     __ cmpd(CCR1, temp2, recv);

     __ beq(CCR1, 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.

     __ stop("Should not reach here");           // empty stubs make SG sick

     return NULL;

   }

   Register argbase    = R17_tos; // parameter (preserved)

   Register argslot    = R3;

   Register temp1      = R6;

   Register param_size = R7;

   // here's where control starts out:

   __ align(CodeEntryAlignment);

   address entry_point = __ pc();

   if (VerifyMethodHandles) {

     Label L;

     BLOCK_COMMENT("verify_intrinsic_id {");

     __ load_sized_value(temp1, Method::intrinsic_id_offset_in_bytes(), R19_method,

                         sizeof(u1), /*is_signed*/ false);

     // assert(sizeof(u1) == sizeof(Method::_intrinsic_id), "");

     __ cmpwi(CCR1, temp1, (int) iid);

     __ beq(CCR1, 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 Method*:intrinsic_id");

     }

     __ stop("bad Method*::intrinsic_id");

     __ BIND(L);

     BLOCK_COMMENT("} verify_intrinsic_id");

   }

   // First task:  Find out how big the argument list is.

   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)) {

     __ ld(param_size, in_bytes(Method::const_offset()), R19_method);

     __ load_sized_value(param_size, in_bytes(ConstMethod::size_of_parameters_offset()), param_size,

                         sizeof(u2), /*is_signed*/ false);

     // assert(sizeof(u2) == sizeof(ConstMethod::_size_of_parameters), "");

   } else {

     DEBUG_ONLY(param_size = noreg);

   }

   Register tmp_mh = noreg;

   if (!is_signature_polymorphic_static(iid)) {

     __ ld(tmp_mh = temp1, __ argument_offset(param_size, param_size, 0), argbase);

     DEBUG_ONLY(param_size = noreg);

   }

   if (TraceMethodHandles) {

     if (tmp_mh != noreg)

       __ mr(R23_method_handle, tmp_mh);  // make stub happy

     trace_method_handle_interpreter_entry(_masm, iid);

   }

   if (iid == vmIntrinsics::_invokeBasic) {

     generate_method_handle_dispatch(_masm, iid, tmp_mh, noreg, not_for_compiler_entry);

   } else {

     // Adjust argument list by popping the trailing MemberName argument.

     Register tmp_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(tmp_recv = temp1, __ argument_offset(param_size, param_size, 0), argbase);

       DEBUG_ONLY(param_size = noreg);

     }

     Register R19_member = R19_method;  // MemberName ptr; incoming method ptr is dead now

     __ ld(R19_member, RegisterOrConstant((intptr_t)8), argbase);

     __ add(argbase, Interpreter::stackElementSize, argbase);

     generate_method_handle_dispatch(_masm, iid, tmp_recv, R19_member, not_for_compiler_entry);

   }

   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");

   Register temp1 = (for_compiler_entry ? R21_tmp1 : 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, 0, temp1, StubRoutines::throw_NullPointerException_at_call_entry());

       } else {

         // load receiver klass itself

         __ null_check_throw(receiver_reg, oopDesc::klass_offset_in_bytes(),

                                 temp1, StubRoutines::throw_NullPointerException_at_call_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);

         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);

       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();

     }

   }

 }

 #ifndef PRODUCT

 void trace_method_handle_stub(const char* adaptername,

                               oopDesc* mh,

                               intptr_t* entry_sp,

                               intptr_t* saved_regs) {

   bool has_mh = (strstr(adaptername, "/static") == NULL &&

                  strstr(adaptername, "linkTo") == NULL);    // static linkers don't have MH

   const char* mh_reg_name = has_mh ? "R23_method_handle" : "G23";

   tty->print_cr("MH %s %s="INTPTR_FORMAT " sp=" INTPTR_FORMAT,

                 adaptername, mh_reg_name, (intptr_t) mh, entry_sp);

   if (Verbose) {

     tty->print_cr("Registers:");

     const int abi_offset = frame::abi_112_size / 8;

     for (int i = R3->encoding(); i <= R13->encoding(); i++) {

       Register r = as_Register(i);

       int count = i - R3->encoding();

       // The registers are stored in reverse order on the stack (by save_volatile_gprs(R1_SP, abi_112_size)).

       tty->print("%3s=" PTR_FORMAT, r->name(), saved_regs[abi_offset + count]);

       if ((count + 1) % 4 == 0) {

         tty->cr();

       } else {

         tty->print(", ");

       }

     }

     tty->cr();

     {

       // 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 PC on the stack top (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

       // Current C frame

       frame cur_frame = os::current_frame();

       // Robust search of trace_calling_frame (independant of inlining).

       // Assumes saved_regs comes from a pusha in the trace_calling_frame.

       assert(cur_frame.sp() < saved_regs, "registers not saved on stack ?");

       frame trace_calling_frame = os::get_sender_for_C_frame(&cur_frame);

       while (trace_calling_frame.fp() < saved_regs) {

         trace_calling_frame = os::get_sender_for_C_frame(&trace_calling_frame);

       }

       // safely create a frame and call frame::describe

       intptr_t *dump_sp = trace_calling_frame.sender_sp();

       frame dump_frame = frame(dump_sp);

       dump_frame.describe(values, 1);

       values.describe(-1, saved_regs, "raw top of stack");

       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 {");

   int nbytes_save = 10 * 8;             // 10 volatile gprs

   __ save_LR_CR(R0);

   __ mr(R0, R1_SP);                     // saved_sp

   assert(Assembler::is_simm(-nbytes_save, 16), "Overwriting R0");

   // push_frame_abi112 only uses R0 if nbytes_save is wider than 16 bit

   __ push_frame_abi112(nbytes_save, R0);

   __ save_volatile_gprs(R1_SP, frame::abi_112_size); // Except R0.

   __ load_const(R3_ARG1, (address)adaptername);

   __ mr(R4_ARG2, R23_method_handle);

   __ mr(R5_ARG3, R0);        // saved_sp

   __ mr(R6_ARG4, R1_SP);

   __ call_VM_leaf(CAST_FROM_FN_PTR(address, trace_method_handle_stub));

   __ restore_volatile_gprs(R1_SP, 112); // except R0

   __ pop_frame();

   __ restore_LR_CR(R0);

   BLOCK_COMMENT("} trace_method_handle");

 }

 #endif // PRODUCT