jdk8-mips64-public/hotspot: src/share/vm/runtime/registerMap.hpp@fa6adc194d48 (annotated)

src/share/vm/runtime/registerMap.hpp@fa6adc194d48 (annotated)

src/share/vm/runtime/registerMap.hpp

Wed, 19 Nov 2014 14:21:09 -0800

author: mchung
date: Wed, 19 Nov 2014 14:21:09 -0800
changeset 7368: fa6adc194d48
parent 2708: 1d1603768966
child 6876: 710a3c8b516e
permissions: -rw-r--r--

8064667: Add -XX:+CheckEndorsedAndExtDirs flag to JDK 8
Reviewed-by: coleenp, ccheung

 /*
  * Copyright (c) 2002, 2011, 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.
  *
  */
 #ifndef SHARE_VM_RUNTIME_REGISTERMAP_HPP
 #define SHARE_VM_RUNTIME_REGISTERMAP_HPP
 #include "code/vmreg.hpp"
 #include "utilities/globalDefinitions.hpp"
 #ifdef TARGET_ARCH_x86
 # include "register_x86.hpp"
 #endif
 #ifdef TARGET_ARCH_sparc
 # include "register_sparc.hpp"
 #endif
 #ifdef TARGET_ARCH_zero
 # include "register_zero.hpp"
 #endif
 #ifdef TARGET_ARCH_arm
 # include "register_arm.hpp"
 #endif
 #ifdef TARGET_ARCH_ppc
 # include "register_ppc.hpp"
 #endif
 class JavaThread;
 //
 // RegisterMap
 //
 // A companion structure used for stack traversal. The RegisterMap contains
 // misc. information needed in order to do correct stack traversal of stack
 // frames.  Hence, it must always be passed in as an argument to
 // frame::sender(RegisterMap*).
 //
 // In particular,
 //   1) It provides access to the thread for which the stack belongs.  The
 //      thread object is needed in order to get sender of a deoptimized frame.
 //
 //   2) It is used to pass information from a callee frame to its caller
 //      frame about how the frame should be traversed.  This is used to let
 //      the caller frame take care of calling oops-do of out-going
 //      arguments, when the callee frame is not instantiated yet.  This
 //      happens, e.g., when a compiled frame calls into
 //      resolve_virtual_call.  (Hence, it is critical that the same
 //      RegisterMap object is used for the entire stack walk.  Normally,
 //      this is hidden by using the StackFrameStream.)  This is used when
 //      doing follow_oops and oops_do.
 //
 //   3) The RegisterMap keeps track of the values of callee-saved registers
 //      from frame to frame (hence, the name).  For some stack traversal the
 //      values of the callee-saved registers does not matter, e.g., if you
 //      only need the static properies such as frame type, pc, and such.
 //      Updating of the RegisterMap can be turned off by instantiating the
 //      register map as: RegisterMap map(thread, false);
 class RegisterMap : public StackObj {
  public:
     typedef julong LocationValidType;
   enum {
     reg_count = ConcreteRegisterImpl::number_of_registers,
     location_valid_type_size = sizeof(LocationValidType)*8,
     location_valid_size = (reg_count+location_valid_type_size-1)/location_valid_type_size
   };
  private:
   intptr_t*    _location[reg_count];    // Location of registers (intptr_t* looks better than address in the debugger)
   LocationValidType _location_valid[location_valid_size];
   bool        _include_argument_oops;   // Should include argument_oop marked locations for compiler
   JavaThread* _thread;                  // Reference to current thread
   bool        _update_map;              // Tells if the register map need to be
                                         // updated when traversing the stack
 #ifdef ASSERT
   void check_location_valid();
 #else
   void check_location_valid() {}
 #endif
  public:
   debug_only(intptr_t* _update_for_id;) // Assert that RegisterMap is not updated twice for same frame
   RegisterMap(JavaThread *thread, bool update_map = true);
   RegisterMap(const RegisterMap* map);
   address location(VMReg reg) const {
     int index = reg->value() / location_valid_type_size;
     assert(0 <= reg->value() && reg->value() < reg_count, "range check");
     assert(0 <= index && index < location_valid_size, "range check");
     if (_location_valid[index] & ((LocationValidType)1 << (reg->value() % location_valid_type_size))) {
       return (address) _location[reg->value()];
     } else {
       return pd_location(reg);
     }
   }
   void set_location(VMReg reg, address loc) {
     int index = reg->value() / location_valid_type_size;
     assert(0 <= reg->value() && reg->value() < reg_count, "range check");
     assert(0 <= index && index < location_valid_size, "range check");
     assert(_update_map, "updating map that does not need updating");
     _location[reg->value()] = (intptr_t*) loc;
     _location_valid[index] |= ((LocationValidType)1 << (reg->value() % location_valid_type_size));
     check_location_valid();
   }
   // Called by an entry frame.
   void clear();
   bool include_argument_oops() const      { return _include_argument_oops; }
   void set_include_argument_oops(bool f)  { _include_argument_oops = f; }
   JavaThread *thread() const { return _thread; }
   bool update_map()    const { return _update_map; }
   void print_on(outputStream* st) const;
   void print() const;
   // the following contains the definition of pd_xxx methods
 #ifdef TARGET_ARCH_x86
 # include "registerMap_x86.hpp"
 #endif
 #ifdef TARGET_ARCH_sparc
 # include "registerMap_sparc.hpp"
 #endif
 #ifdef TARGET_ARCH_zero
 # include "registerMap_zero.hpp"
 #endif
 #ifdef TARGET_ARCH_arm
 # include "registerMap_arm.hpp"
 #endif
 #ifdef TARGET_ARCH_ppc
 # include "registerMap_ppc.hpp"
 #endif
 };
 #endif // SHARE_VM_RUNTIME_REGISTERMAP_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

src/share/vm/runtime/registerMap.hpp@fa6adc194d48 (annotated)

src/share/vm/runtime/registerMap.hpp