src/lj_ccall.h

   1 /*
   2 ** FFI C call handling.
   3 ** Copyright (C) 2005-2011 Mike Pall. See Copyright Notice in luajit.h
   4 */
   5
   6 #ifndef _LJ_CCALL_H
   7 #define _LJ_CCALL_H
   8
   9 #include "lj_obj.h"
  10 #include "lj_ctype.h"
  11
  12 #if LJ_HASFFI
  13
  14 /* -- C calling conventions ----------------------------------------------- */
  15
  16 #if LJ_TARGET_X86ORX64
  17
  18 #if LJ_TARGET_X86
  19 #define CCALL_NARG_GPR          2       /* For fastcall arguments. */
  20 #define CCALL_NARG_FPR          0
  21 #define CCALL_NRET_GPR          2
  22 #define CCALL_NRET_FPR          1       /* For FP results on x87 stack. */
  23 #define CCALL_ALIGN_STACKARG    0       /* Don't align argument on stack. */
  24 #elif LJ_ABI_WIN
  25 #define CCALL_NARG_GPR          4
  26 #define CCALL_NARG_FPR          4
  27 #define CCALL_NRET_GPR          1
  28 #define CCALL_NRET_FPR          1
  29 #define CCALL_SPS_EXTRA         4
  30 #else
  31 #define CCALL_NARG_GPR          6
  32 #define CCALL_NARG_FPR          8
  33 #define CCALL_NRET_GPR          2
  34 #define CCALL_NRET_FPR          2
  35 #define CCALL_VECTOR_REG        1       /* Pass vectors in registers. */
  36 #endif
  37
  38 #define CCALL_SPS_FREE          1
  39
  40 typedef LJ_ALIGN(16) union FPRArg {
  41   double d[2];
  42   float f[4];
  43   uint8_t b[16];
  44   uint16_t s[8];
  45   int i[4];
  46   int64_t l[2];
  47 } FPRArg;
  48
  49 typedef intptr_t GPRArg;
  50
  51 #elif LJ_TARGET_ARM
  52
  53 #define CCALL_NARG_GPR          4
  54 #define CCALL_NARG_FPR          0
  55 #define CCALL_NRET_GPR          2       /* For softfp double. */
  56 #define CCALL_NRET_FPR          0
  57 #define CCALL_SPS_FREE          0
  58
  59 typedef intptr_t GPRArg;
  60
  61 #elif LJ_TARGET_PPC
  62
  63 #define CCALL_NARG_GPR          8
  64 #define CCALL_NARG_FPR          8
  65 #define CCALL_NRET_GPR          4       /* For complex double. */
  66 #define CCALL_NRET_FPR          1
  67 #define CCALL_SPS_EXTRA         4
  68 #define CCALL_SPS_FREE          0
  69
  70 typedef intptr_t GPRArg;
  71 typedef double FPRArg;
  72
  73 #elif LJ_TARGET_PPCSPE
  74
  75 #define CCALL_NARG_GPR          8
  76 #define CCALL_NARG_FPR          0
  77 #define CCALL_NRET_GPR          4       /* For softfp complex double. */
  78 #define CCALL_NRET_FPR          0
  79 #define CCALL_SPS_FREE          0       /* NYI */
  80
  81 typedef intptr_t GPRArg;
  82
  83 #else
  84 #error "Missing calling convention definitions for this architecture"
  85 #endif
  86
  87 #ifndef CCALL_SPS_EXTRA
  88 #define CCALL_SPS_EXTRA         0
  89 #endif
  90 #ifndef CCALL_VECTOR_REG
  91 #define CCALL_VECTOR_REG        0
  92 #endif
  93 #ifndef CCALL_ALIGN_STACKARG
  94 #define CCALL_ALIGN_STACKARG    1
  95 #endif
  96
  97 #define CCALL_NUM_GPR \
  98   (CCALL_NARG_GPR > CCALL_NRET_GPR ? CCALL_NARG_GPR : CCALL_NRET_GPR)
  99 #define CCALL_NUM_FPR \
 100   (CCALL_NARG_FPR > CCALL_NRET_FPR ? CCALL_NARG_FPR : CCALL_NRET_FPR)
 101
 102 /* Check against constants in lj_ctype.h. */
 103 LJ_STATIC_ASSERT(CCALL_NUM_GPR <= CCALL_MAX_GPR);
 104 LJ_STATIC_ASSERT(CCALL_NUM_FPR <= CCALL_MAX_FPR);
 105
 106 #define CCALL_MAXSTACK          32
 107
 108 /* -- C call state -------------------------------------------------------- */
 109
 110 typedef struct CCallState {
 111   void (*func)(void);           /* Pointer to called function. */
 112   uint32_t spadj;               /* Stack pointer adjustment. */
 113   uint8_t nsp;                  /* Number of stack slots. */
 114   uint8_t retref;               /* Return value by reference. */
 115 #if LJ_TARGET_X64
 116   uint8_t ngpr;                 /* Number of arguments in GPRs. */
 117   uint8_t nfpr;                 /* Number of arguments in FPRs. */
 118 #elif LJ_TARGET_X86
 119   uint8_t resx87;               /* Result on x87 stack: 1:float, 2:double. */
 120 #elif LJ_TARGET_PPC
 121   uint8_t nfpr;                 /* Number of arguments in FPRs. */
 122 #endif
 123 #if CCALL_NUM_FPR
 124 #if LJ_32
 125   int32_t align1;
 126 #endif
 127   FPRArg fpr[CCALL_NUM_FPR];    /* Arguments/results in FPRs. */
 128 #endif
 129   GPRArg gpr[CCALL_NUM_GPR];    /* Arguments/results in GPRs. */
 130   GPRArg stack[CCALL_MAXSTACK]; /* Stack slots. */
 131 } CCallState;
 132
 133 /* -- C call handling ----------------------------------------------------- */
 134
 135 /* Really belongs to lj_vm.h. */
 136 LJ_ASMF void LJ_FASTCALL lj_vm_ffi_call(CCallState *cc);
 137
 138 LJ_FUNC CTypeID lj_ccall_ctid_vararg(CTState *cts, cTValue *o);
 139 LJ_FUNC int lj_ccall_func(lua_State *L, GCcdata *cd);
 140
 141 #endif
 142
 143 #endif