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      1 // Copyright 2006-2008 the V8 project authors. All rights reserved.
      2 // Redistribution and use in source and binary forms, with or without
      3 // modification, are permitted provided that the following conditions are
      4 // met:
      5 //
      6 //     * Redistributions of source code must retain the above copyright
      7 //       notice, this list of conditions and the following disclaimer.
      8 //     * Redistributions in binary form must reproduce the above
      9 //       copyright notice, this list of conditions and the following
     10 //       disclaimer in the documentation and/or other materials provided
     11 //       with the distribution.
     12 //     * Neither the name of Google Inc. nor the names of its
     13 //       contributors may be used to endorse or promote products derived
     14 //       from this software without specific prior written permission.
     15 //
     16 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     17 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     18 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     19 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     20 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     21 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     22 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     23 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     24 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     26 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27 
     28 // This module contains the architecture-specific code. This make the rest of
     29 // the code less dependent on differences between different processor
     30 // architecture.
     31 // The classes have the same definition for all architectures. The
     32 // implementation for a particular architecture is put in cpu_<arch>.cc.
     33 // The build system then uses the implementation for the target architecture.
     34 //
     35 
     36 #ifndef V8_CPU_H_
     37 #define V8_CPU_H_
     38 
     39 namespace v8 {
     40 namespace internal {
     41 
     42 // ----------------------------------------------------------------------------
     43 // CPU
     44 //
     45 // This class has static methods for the architecture specific functions. Add
     46 // methods here to cope with differences between the supported architectures.
     47 //
     48 // For each architecture the file cpu_<arch>.cc contains the implementation of
     49 // these functions.
     50 
     51 class CPU : public AllStatic {
     52  public:
     53   // Initializes the cpu architecture support. Called once at VM startup.
     54   static void Setup();
     55 
     56   static bool SupportsCrankshaft();
     57 
     58   // Flush instruction cache.
     59   static void FlushICache(void* start, size_t size);
     60 
     61   // Try to activate a system level debugger.
     62   static void DebugBreak();
     63 };
     64 
     65 } }  // namespace v8::internal
     66 
     67 #endif  // V8_CPU_H_
     68