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

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

src/cpu/sparc/vm/vm_version_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 2403: c04052fd6ae1
child 3001: faa472957b38
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) 1997, 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 "assembler_sparc.inline.hpp"
 #include "memory/resourceArea.hpp"
 #include "runtime/java.hpp"
 #include "runtime/stubCodeGenerator.hpp"
 #include "vm_version_sparc.hpp"
 #ifdef TARGET_OS_FAMILY_linux
 # include "os_linux.inline.hpp"
 #endif
 #ifdef TARGET_OS_FAMILY_solaris
 # include "os_solaris.inline.hpp"
 #endif
 int VM_Version::_features = VM_Version::unknown_m;
 const char* VM_Version::_features_str = "";
 void VM_Version::initialize() {
   _features = determine_features();
   PrefetchCopyIntervalInBytes = prefetch_copy_interval_in_bytes();
   PrefetchScanIntervalInBytes = prefetch_scan_interval_in_bytes();
   PrefetchFieldsAhead         = prefetch_fields_ahead();
   // Allocation prefetch settings
   intx cache_line_size = L1_data_cache_line_size();
   if( cache_line_size > AllocatePrefetchStepSize )
     AllocatePrefetchStepSize = cache_line_size;
   if( FLAG_IS_DEFAULT(AllocatePrefetchLines) )
     AllocatePrefetchLines = 3; // Optimistic value
   assert( AllocatePrefetchLines > 0, "invalid value");
   if( AllocatePrefetchLines < 1 ) // set valid value in product VM
     AllocatePrefetchLines = 1; // Conservative value
   AllocatePrefetchDistance = allocate_prefetch_distance();
   AllocatePrefetchStyle    = allocate_prefetch_style();
   assert(AllocatePrefetchDistance % AllocatePrefetchStepSize == 0, "invalid value");
   UseSSE = 0; // Only on x86 and x64
   _supports_cx8               = has_v9();
   if (is_niagara()) {
     // Indirect branch is the same cost as direct
     if (FLAG_IS_DEFAULT(UseInlineCaches)) {
       FLAG_SET_DEFAULT(UseInlineCaches, false);
     }
     // Align loops on a single instruction boundary.
     if (FLAG_IS_DEFAULT(OptoLoopAlignment)) {
       FLAG_SET_DEFAULT(OptoLoopAlignment, 4);
     }
     // When using CMS, we cannot use memset() in BOT updates because
     // the sun4v/CMT version in libc_psr uses BIS which exposes
     // "phantom zeros" to concurrent readers. See 6948537.
     if (FLAG_IS_DEFAULT(UseMemSetInBOT) && UseConcMarkSweepGC) {
       FLAG_SET_DEFAULT(UseMemSetInBOT, false);
     }
 #ifdef _LP64
     // 32-bit oops don't make sense for the 64-bit VM on sparc
     // since the 32-bit VM has the same registers and smaller objects.
     Universe::set_narrow_oop_shift(LogMinObjAlignmentInBytes);
 #endif // _LP64
 #ifdef COMPILER2
     // Indirect branch is the same cost as direct
     if (FLAG_IS_DEFAULT(UseJumpTables)) {
       FLAG_SET_DEFAULT(UseJumpTables, true);
     }
     // Single-issue, so entry and loop tops are
     // aligned on a single instruction boundary
     if (FLAG_IS_DEFAULT(InteriorEntryAlignment)) {
       FLAG_SET_DEFAULT(InteriorEntryAlignment, 4);
     }
     if (is_niagara_plus()) {
       if (has_blk_init() && AllocatePrefetchStyle > 0 &&
           FLAG_IS_DEFAULT(AllocatePrefetchStyle)) {
         // Use BIS instruction for allocation prefetch.
         FLAG_SET_DEFAULT(AllocatePrefetchStyle, 3);
         if (FLAG_IS_DEFAULT(AllocatePrefetchDistance)) {
           // Use smaller prefetch distance on N2 with BIS
           FLAG_SET_DEFAULT(AllocatePrefetchDistance, 64);
         }
       }
       if (AllocatePrefetchStyle != 3 && FLAG_IS_DEFAULT(AllocatePrefetchDistance)) {
         // Use different prefetch distance without BIS
         FLAG_SET_DEFAULT(AllocatePrefetchDistance, 256);
       }
     }
 #endif
   }
   // Use hardware population count instruction if available.
   if (has_hardware_popc()) {
     if (FLAG_IS_DEFAULT(UsePopCountInstruction)) {
       FLAG_SET_DEFAULT(UsePopCountInstruction, true);
     }
   }
 #ifdef COMPILER2
   // Currently not supported anywhere.
   FLAG_SET_DEFAULT(UseFPUForSpilling, false);
 #endif
   char buf[512];
   jio_snprintf(buf, sizeof(buf), "%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s",
                (has_v8() ? ", has_v8" : ""),
                (has_v9() ? ", has_v9" : ""),
                (has_hardware_popc() ? ", popc" : ""),
                (has_vis1() ? ", has_vis1" : ""),
                (has_vis2() ? ", has_vis2" : ""),
                (has_vis3() ? ", has_vis3" : ""),
                (has_blk_init() ? ", has_blk_init" : ""),
                (is_ultra3() ? ", is_ultra3" : ""),
                (is_sun4v() ? ", is_sun4v" : ""),
                (is_niagara() ? ", is_niagara" : ""),
                (is_niagara_plus() ? ", is_niagara_plus" : ""),
                (is_sparc64() ? ", is_sparc64" : ""),
                (!has_hardware_mul32() ? ", no-mul32" : ""),
                (!has_hardware_div32() ? ", no-div32" : ""),
                (!has_hardware_fsmuld() ? ", no-fsmuld" : ""));
   // buf is started with ", " or is empty
   _features_str = strdup(strlen(buf) > 2 ? buf + 2 : buf);
 #ifndef PRODUCT
   if (PrintMiscellaneous && Verbose) {
     tty->print("Allocation: ");
     if (AllocatePrefetchStyle <= 0) {
       tty->print_cr("no prefetching");
     } else {
       if (AllocatePrefetchLines > 1) {
         tty->print_cr("PREFETCH %d, %d lines of size %d bytes", AllocatePrefetchDistance, AllocatePrefetchLines, AllocatePrefetchStepSize);
       } else {
         tty->print_cr("PREFETCH %d, one line", AllocatePrefetchDistance);
       }
     }
     if (PrefetchCopyIntervalInBytes > 0) {
       tty->print_cr("PrefetchCopyIntervalInBytes %d", PrefetchCopyIntervalInBytes);
     }
     if (PrefetchScanIntervalInBytes > 0) {
       tty->print_cr("PrefetchScanIntervalInBytes %d", PrefetchScanIntervalInBytes);
     }
     if (PrefetchFieldsAhead > 0) {
       tty->print_cr("PrefetchFieldsAhead %d", PrefetchFieldsAhead);
     }
   }
 #endif // PRODUCT
 }
 void VM_Version::print_features() {
   tty->print_cr("Version:%s", cpu_features());
 }
 int VM_Version::determine_features() {
   if (UseV8InstrsOnly) {
     NOT_PRODUCT(if (PrintMiscellaneous && Verbose) tty->print_cr("Version is Forced-V8");)
     return generic_v8_m;
   }
   int features = platform_features(unknown_m); // platform_features() is os_arch specific
   if (features == unknown_m) {
     features = generic_v9_m;
     warning("Cannot recognize SPARC version. Default to V9");
   }
   assert(is_T_family(features) == is_niagara(features), "Niagara should be T series");
   if (UseNiagaraInstrs) { // Force code generation for Niagara
     if (is_T_family(features)) {
       // Happy to accomodate...
     } else {
       NOT_PRODUCT(if (PrintMiscellaneous && Verbose) tty->print_cr("Version is Forced-Niagara");)
       features |= T_family_m;
     }
   } else {
     if (is_T_family(features) && !FLAG_IS_DEFAULT(UseNiagaraInstrs)) {
       NOT_PRODUCT(if (PrintMiscellaneous && Verbose) tty->print_cr("Version is Forced-Not-Niagara");)
       features &= ~(T_family_m | T1_model_m);
     } else {
       // Happy to accomodate...
     }
   }
   return features;
 }
 static int saved_features = 0;
 void VM_Version::allow_all() {
   saved_features = _features;
   _features      = all_features_m;
 }
 void VM_Version::revert() {
   _features = saved_features;
 }
 unsigned int VM_Version::calc_parallel_worker_threads() {
   unsigned int result;
   if (is_niagara_plus()) {
     result = nof_parallel_worker_threads(5, 16, 8);
   } else {
     result = nof_parallel_worker_threads(5, 8, 8);
   }
   return result;
 }

Mercurial > jdk8-mips64-public > hotspot / annotate

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

src/cpu/sparc/vm/vm_version_sparc.cpp