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

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

src/share/vm/runtime/icache.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) 1997, 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_ICACHE_HPP
 #define SHARE_VM_RUNTIME_ICACHE_HPP
 #include "memory/allocation.hpp"
 #include "runtime/stubCodeGenerator.hpp"
 // Interface for updating the instruction cache.  Whenever the VM modifies
 // code, part of the processor instruction cache potentially has to be flushed.
 // Default implementation is in icache.cpp, and can be hidden per-platform.
 // Most platforms must provide only ICacheStubGenerator::generate_icache_flush().
 // Platforms that don't require icache flushing can just nullify the public
 // members of AbstractICache in their ICache class.  AbstractICache should never
 // be referenced other than by deriving the ICache class from it.
 //
 // The code for the ICache class and for generate_icache_flush() must be in
 // architecture-specific files, i.e., icache_<arch>.hpp/.cpp
 class AbstractICache : AllStatic {
  public:
   // The flush stub signature
   typedef int (*flush_icache_stub_t)(address addr, int lines, int magic);
  protected:
   // The flush stub function address
   static flush_icache_stub_t _flush_icache_stub;
   // Call the flush stub
   static void call_flush_stub(address start, int lines);
  public:
   enum {
     stub_size      = 0, // Size of the icache flush stub in bytes
     line_size      = 0, // Icache line size in bytes
     log2_line_size = 0  // log2(line_size)
   };
   static void initialize();
   static void invalidate_word(address addr);
   static void invalidate_range(address start, int nbytes);
 };
 // Must be included before the definition of ICacheStubGenerator
 // because ICacheStubGenerator uses ICache definitions.
 #ifdef TARGET_ARCH_x86
 # include "icache_x86.hpp"
 #endif
 #ifdef TARGET_ARCH_sparc
 # include "icache_sparc.hpp"
 #endif
 #ifdef TARGET_ARCH_zero
 # include "icache_zero.hpp"
 #endif
 #ifdef TARGET_ARCH_arm
 # include "icache_arm.hpp"
 #endif
 #ifdef TARGET_ARCH_ppc
 # include "icache_ppc.hpp"
 #endif
 class ICacheStubGenerator : public StubCodeGenerator {
  public:
   ICacheStubGenerator(CodeBuffer *c) : StubCodeGenerator(c) {}
   // Generate the icache flush stub.
   //
   // Since we cannot flush the cache when this stub is generated,
   // it must be generated first, and just to be sure, we do extra
   // work to allow a check that these instructions got executed.
   //
   // The flush stub has three parameters (see flush_icache_stub_t).
   //
   //   addr  - Start address, must be aligned at log2_line_size
   //   lines - Number of line_size icache lines to flush
   //   magic - Magic number copied to result register to make sure
   //           the stub executed properly
   //
   // A template for generate_icache_flush is
   //
   //    #define __ _masm->
   //
   //    void ICacheStubGenerator::generate_icache_flush(
   //      ICache::flush_icache_stub_t* flush_icache_stub
   //    ) {
   //      StubCodeMark mark(this, "ICache", "flush_icache_stub");
   //
   //      address start = __ pc();
   //
   //      // emit flush stub asm code
   //
   //      // Must be set here so StubCodeMark destructor can call the flush stub.
   //      *flush_icache_stub = (ICache::flush_icache_stub_t)start;
   //    };
   //
   //    #undef __
   //
   // The first use of flush_icache_stub must apply it to itself.  The
   // StubCodeMark destructor in generate_icache_flush will call Assembler::flush,
   // which in turn will call invalidate_range (see asm/assembler.cpp), which
   // in turn will call the flush stub *before* generate_icache_flush returns.
   // The usual method of having generate_icache_flush return the address of the
   // stub to its caller, which would then, e.g., store that address in
   // flush_icache_stub, won't work.  generate_icache_flush must itself set
   // flush_icache_stub to the address of the stub it generates before
   // the StubCodeMark destructor is invoked.
   void generate_icache_flush(ICache::flush_icache_stub_t* flush_icache_stub);
 };
 #endif // SHARE_VM_RUNTIME_ICACHE_HPP

Mercurial > jdk8-mips64-public > hotspot / annotate

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

src/share/vm/runtime/icache.hpp