1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/src/Platform.h	Tue Jul 24 23:53:34 2012 -0700
     1.3 @@ -0,0 +1,91 @@
     1.4 +/* vim: set ts=4 sw=4 tw=99 et:
     1.5 + *
     1.6 + * Copyright (C) 2012 David Anderson
     1.7 + *
     1.8 + * This file is part of JITCraft.
     1.9 + *
    1.10 + * JITCraft is free software: you can redistribute it and/or modify it under
    1.11 + * the terms of the GNU General Public License as published by the Free
    1.12 + * Software Foundation, either version 3 of the License, or (at your option)
    1.13 + * any later version.
    1.14 + * 
    1.15 + * Foobar is distributed in the hope that it will be useful, but WITHOUT ANY
    1.16 + * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
    1.17 + * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
    1.18 + *
    1.19 + * You should have received a copy of the GNU General Public License along with
    1.20 + * JITCraft. If not, see http://www.gnu.org/licenses/.
    1.21 + */
    1.22 +#ifndef _include_jitcraft_platform_h_
    1.23 +#define _include_jitcraft_platform_h_
    1.24 +
    1.25 +#include "Utility.h"
    1.26 +
    1.27 +namespace ke {
    1.28 +
    1.29 +namespace OS {
    1.30 +    enum Protection {
    1.31 +        Prot_ReadWrite,         // rw-, for the heap
    1.32 +        Prot_ReadExecute,       // r-x, for code
    1.33 +        Prot_ReadWriteExecute   // rwx, if disabling r-x for code.
    1.34 +    };
    1.35 +
    1.36 +    enum MapMode {
    1.37 +        Map_Reserve,            // don't ask for actual pages yet
    1.38 +        Map_Commit              // ask for pages right away
    1.39 +    };
    1.40 +
    1.41 +    Address MapMemory(size_t amount, MapMode mode, Protection prot);
    1.42 +    bool CommitMemory(Address address, size_t amount, Protection prot);
    1.43 +    void UnmapMemory(Address address, size_t size);
    1.44 +
    1.45 +    class AlignableMapping {
    1.46 +        Address base_;
    1.47 +        Address aligned_;
    1.48 +        size_t size_;
    1.49 +
    1.50 +      public:
    1.51 +        AlignableMapping(Address ptr, size_t alignment, size_t size)
    1.52 +          : base_(ptr),
    1.53 +            size_(size)
    1.54 +        {
    1.55 +            aligned_ = base_;
    1.56 +            if (!IsAligned(aligned_, alignment))
    1.57 +                aligned_ = AlignedBase(aligned_, alignment) + alignment;
    1.58 +        }
    1.59 +
    1.60 +        AlignableMapping() : base_(NULL), aligned_(NULL), size_(0)
    1.61 +        {
    1.62 +        }
    1.63 +
    1.64 +        Address base() const {
    1.65 +            return base_;
    1.66 +        }
    1.67 +        bool isValid() const {
    1.68 +            return !!base_;
    1.69 +        }
    1.70 +        size_t size() const {
    1.71 +            return size_;
    1.72 +        }
    1.73 +        Address aligned() const {
    1.74 +            return aligned_;
    1.75 +        }
    1.76 +    };
    1.77 +
    1.78 +    // MapAlignedMemory is guaranteed to return zeroed memory.
    1.79 +    AlignableMapping MapAlignedMemory(size_t amount, size_t alignment, MapMode mode);
    1.80 +    void UnmapAlignedMemory(Address address, size_t size);
    1.81 +
    1.82 +    // The default alignment of memory returned via MapMemory().
    1.83 +    // :TODO: better ifdefs
    1.84 +#ifdef _MSC_VER
    1.85 +    static const size_t kPageAlignment = 64 * kKB;
    1.86 +#else
    1.87 +    static const size_t kPageAlignment = 4 * kKB;
    1.88 +#endif
    1.89 +
    1.90 +}
    1.91 +
    1.92 +}
    1.93 +
    1.94 +#endif // _include_jitcraft_platform_h_