nanojit/njconfig.h

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  39
  40 #ifndef __njconfig_h__
  41 #define __njconfig_h__
  42
  43 #include "avmplus.h"
  44
  45 // Do not include nanojit.h here; this file should be usable without it.
  46
  47 #ifdef FEATURE_NANOJIT
  48
  49 namespace nanojit
  50 {
  51     /***
  52      * A struct used to configure the assumptions that Assembler can make when
  53      * generating code. The ctor will fill in all fields with the most reasonable
  54      * values it can derive from compiler flags and/or runtime detection, but
  55      * the embedder is free to override any or all of them as it sees fit.
  56      * Using the ctor-provided default setup is guaranteed to provide a safe
  57      * runtime environment (though perhaps suboptimal in some cases), so an embedder
  58      * should replace these values with great care.
  59      *
  60      * Note that although many fields are used on only specific architecture(s),
  61      * this struct is deliberately declared without ifdef's for them, so (say) ARM-specific
  62      * fields are declared everywhere. This reduces build dependencies (so that this
  63      * files does not require nanojit.h to be included beforehand) and also reduces
  64      * clutter in this file; the extra storage space required is trivial since most
  65      * fields are single bits.
  66      */
  67     struct Config
  68     {
  69     public:
  70         // fills in reasonable default values for all fields.
  71         Config();
  72
  73         // ARM architecture to assume when generate instructions for (currently, 4 <= arm_arch <= 7)
  74         uint8_t arm_arch;
  75
  76         // If true, use CSE.
  77         uint32_t cseopt:1;
  78
  79         // Can we use SSE2 instructions? (x86-only)
  80         uint32_t i386_sse2:1;
  81
  82         // Can we use cmov instructions? (x86-only)
  83         uint32_t i386_use_cmov:1;
  84
  85         // Should we use a virtual stack pointer? (x86-only)
  86         uint32_t i386_fixed_esp:1;
  87
  88         // Whether or not to generate VFP instructions. (ARM only)
  89         uint32_t arm_vfp:1;
  90
  91         // @todo, document me
  92         uint32_t arm_show_stats:1;
  93
  94         // If true, use softfloat for all floating point operations,
  95         // whether or not an FPU is present. (ARM only for now, but might also includes MIPS in the future)
  96         uint32_t soft_float:1;
  97     };
  98 }
  99
 100 #endif // FEATURE_NANOJIT
 101 #endif // __njconfig_h__