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

src/cpu/sparc/vm/interpreterRT_sparc.cpp@e1162778c1c8 (annotated)

src/cpu/sparc/vm/interpreterRT_sparc.cpp

Thu, 07 Apr 2011 09:53:20 -0700

author: johnc
date: Thu, 07 Apr 2011 09:53:20 -0700
changeset 2781: e1162778c1c8
parent 2314: f95d63e2154a
child 4037: da91efe96a93
permissions: -rw-r--r--

7009266: G1: assert(obj->is_oop_or_null(true )) failed: Error
Summary: A referent object that is only weakly reachable at the start of concurrent marking but is re-attached to the strongly reachable object graph during marking may not be marked as live. This can cause the reference object to be processed prematurely and leave dangling pointers to the referent object. Implement a read barrier for the java.lang.ref.Reference::referent field by intrinsifying the Reference.get() method, and intercepting accesses though JNI, reflection, and Unsafe, so that when a non-null referent object is read it is also logged in an SATB buffer.
Reviewed-by: kvn, iveresov, never, tonyp, dholmes

 /*
  * Copyright (c) 1998, 2010, 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 "interpreter/interpreterRuntime.hpp"
 #include "memory/allocation.inline.hpp"
 #include "memory/universe.inline.hpp"
 #include "oops/methodOop.hpp"
 #include "oops/oop.inline.hpp"
 #include "runtime/handles.inline.hpp"
 #include "runtime/icache.hpp"
 #include "runtime/interfaceSupport.hpp"
 #include "runtime/signature.hpp"
 #define __ _masm->
 // Implementation of SignatureHandlerGenerator
 void InterpreterRuntime::SignatureHandlerGenerator::pass_word(int size_of_arg, int offset_in_arg) {
   Argument  jni_arg(jni_offset() + offset_in_arg, false);
   Register     Rtmp = O0;
   __ ld(Llocals, Interpreter::local_offset_in_bytes(offset()), Rtmp);
   __ store_argument(Rtmp, jni_arg);
 }
 void InterpreterRuntime::SignatureHandlerGenerator::pass_long() {
   Argument  jni_arg(jni_offset(), false);
   Register  Rtmp = O0;
 #ifdef _LP64
   __ ldx(Llocals, Interpreter::local_offset_in_bytes(offset() + 1), Rtmp);
   __ store_long_argument(Rtmp, jni_arg);
 #else
   __ ld(Llocals, Interpreter::local_offset_in_bytes(offset() + 1), Rtmp);
   __ store_argument(Rtmp, jni_arg);
   __ ld(Llocals, Interpreter::local_offset_in_bytes(offset() + 0), Rtmp);
   Argument successor(jni_arg.successor());
   __ store_argument(Rtmp, successor);
 #endif
 }
 void InterpreterRuntime::SignatureHandlerGenerator::pass_float() {
   Argument  jni_arg(jni_offset(), false);
 #ifdef _LP64
   FloatRegister  Rtmp = F0;
   __ ldf(FloatRegisterImpl::S, Llocals, Interpreter::local_offset_in_bytes(offset()), Rtmp);
   __ store_float_argument(Rtmp, jni_arg);
 #else
   Register     Rtmp = O0;
   __ ld(Llocals, Interpreter::local_offset_in_bytes(offset()), Rtmp);
   __ store_argument(Rtmp, jni_arg);
 #endif
 }
 void InterpreterRuntime::SignatureHandlerGenerator::pass_double() {
   Argument  jni_arg(jni_offset(), false);
 #ifdef _LP64
   FloatRegister  Rtmp = F0;
   __ ldf(FloatRegisterImpl::D, Llocals, Interpreter::local_offset_in_bytes(offset() + 1), Rtmp);
   __ store_double_argument(Rtmp, jni_arg);
 #else
   Register  Rtmp = O0;
   __ ld(Llocals, Interpreter::local_offset_in_bytes(offset() + 1), Rtmp);
   __ store_argument(Rtmp, jni_arg);
   __ ld(Llocals, Interpreter::local_offset_in_bytes(offset()), Rtmp);
   Argument successor(jni_arg.successor());
   __ store_argument(Rtmp, successor);
 #endif
 }
 void InterpreterRuntime::SignatureHandlerGenerator::pass_object() {
   Argument  jni_arg(jni_offset(), false);
   Argument java_arg(    offset(), true);
   Register    Rtmp1 = O0;
   Register    Rtmp2 =  jni_arg.is_register() ?  jni_arg.as_register() : O0;
   Register    Rtmp3 =  G3_scratch;
   // the handle for a receiver will never be null
   bool do_NULL_check = offset() != 0 || is_static();
   Address     h_arg = Address(Llocals, Interpreter::local_offset_in_bytes(offset()));
   __ ld_ptr(h_arg, Rtmp1);
   if (!do_NULL_check) {
     __ add(h_arg.base(), h_arg.disp(), Rtmp2);
   } else {
     if (Rtmp1 == Rtmp2)
           __ tst(Rtmp1);
     else  __ addcc(G0, Rtmp1, Rtmp2); // optimize mov/test pair
     Label L;
     __ brx(Assembler::notZero, true, Assembler::pt, L);
     __ delayed()->add(h_arg.base(), h_arg.disp(), Rtmp2);
     __ bind(L);
   }
   __ store_ptr_argument(Rtmp2, jni_arg);    // this is often a no-op
 }
 void InterpreterRuntime::SignatureHandlerGenerator::generate(uint64_t fingerprint) {
   // generate code to handle arguments
   iterate(fingerprint);
   // return result handler
   AddressLiteral result_handler(Interpreter::result_handler(method()->result_type()));
   __ sethi(result_handler, Lscratch);
   __ retl();
   __ delayed()->add(Lscratch, result_handler.low10(), Lscratch);
   __ flush();
 }
 // Implementation of SignatureHandlerLibrary
 void SignatureHandlerLibrary::pd_set_handler(address handler) {}
 class SlowSignatureHandler: public NativeSignatureIterator {
  private:
   address   _from;
   intptr_t* _to;
   intptr_t* _RegArgSignature;                   // Signature of first Arguments to be passed in Registers
   uint      _argcount;
   enum {                                        // We need to differenciate float from non floats in reg args
     non_float  = 0,
     float_sig  = 1,
     double_sig = 2,
     long_sig   = 3
   };
   virtual void pass_int() {
     *_to++ = *(jint *)(_from+Interpreter::local_offset_in_bytes(0));
     _from -= Interpreter::stackElementSize;
     add_signature( non_float );
   }
   virtual void pass_object() {
     // pass address of from
     intptr_t *from_addr = (intptr_t*)(_from + Interpreter::local_offset_in_bytes(0));
     *_to++ = (*from_addr == 0) ? NULL : (intptr_t) from_addr;
     _from -= Interpreter::stackElementSize;
     add_signature( non_float );
    }
 #ifdef _LP64
   virtual void pass_float()  {
     *_to++ = *(jint *)(_from+Interpreter::local_offset_in_bytes(0));
     _from -= Interpreter::stackElementSize;
     add_signature( float_sig );
    }
   virtual void pass_double() {
     *_to++ = *(intptr_t*)(_from+Interpreter::local_offset_in_bytes(1));
     _from -= 2*Interpreter::stackElementSize;
    add_signature( double_sig );
    }
   virtual void pass_long() {
     _to[0] = *(intptr_t*)(_from+Interpreter::local_offset_in_bytes(1));
     _to += 1;
     _from -= 2*Interpreter::stackElementSize;
     add_signature( long_sig );
   }
 #else
    // pass_double() is pass_long() and pass_float() only _LP64
   virtual void pass_long() {
     _to[0] = *(intptr_t*)(_from+Interpreter::local_offset_in_bytes(1));
     _to[1] = *(intptr_t*)(_from+Interpreter::local_offset_in_bytes(0));
     _to += 2;
     _from -= 2*Interpreter::stackElementSize;
     add_signature( non_float );
   }
   virtual void pass_float() {
     *_to++ = *(jint *)(_from+Interpreter::local_offset_in_bytes(0));
     _from -= Interpreter::stackElementSize;
     add_signature( non_float );
   }
 #endif // _LP64
   virtual void add_signature( intptr_t sig_type ) {
     if ( _argcount < (sizeof (intptr_t))*4 ) {
       *_RegArgSignature |= (sig_type << (_argcount*2) );
       _argcount++;
     }
   }
  public:
   SlowSignatureHandler(methodHandle method, address from, intptr_t* to, intptr_t *RegArgSig) : NativeSignatureIterator(method) {
     _from = from;
     _to   = to;
     _RegArgSignature = RegArgSig;
     *_RegArgSignature = 0;
     _argcount = method->is_static() ? 2 : 1;
   }
 };
 IRT_ENTRY(address, InterpreterRuntime::slow_signature_handler(
                                                     JavaThread* thread,
                                                     methodOopDesc* method,
                                                     intptr_t* from,
                                                     intptr_t* to ))
   methodHandle m(thread, method);
   assert(m->is_native(), "sanity check");
   // handle arguments
   // Warning: We use reg arg slot 00 temporarily to return the RegArgSignature
   // back to the code that pops the arguments into the CPU registers
   SlowSignatureHandler(m, (address)from, m->is_static() ? to+2 : to+1, to).iterate(UCONST64(-1));
   // return result handler
   return Interpreter::result_handler(m->result_type());
 IRT_END

Mercurial > jdk8-mips64-public > hotspot / annotate

src/cpu/sparc/vm/interpreterRT_sparc.cpp@e1162778c1c8 (annotated)

src/cpu/sparc/vm/interpreterRT_sparc.cpp