source/libs/luajit/LuaJIT-src/src/lj_dispatch.h

   1 /*
   2 ** Instruction dispatch handling.
   3 ** Copyright (C) 2005-2015 Mike Pall. See Copyright Notice in luajit.h
   4 */
   5
   6 #ifndef _LJ_DISPATCH_H
   7 #define _LJ_DISPATCH_H
   8
   9 #include "lj_obj.h"
  10 #include "lj_bc.h"
  11 #if LJ_HASJIT
  12 #include "lj_jit.h"
  13 #endif
  14
  15 #if LJ_TARGET_MIPS
  16 /* Need our own global offset table for the dreaded MIPS calling conventions. */
  17 #if LJ_HASJIT
  18 #define JITGOTDEF(_)    _(lj_trace_exit) _(lj_trace_hot)
  19 #else
  20 #define JITGOTDEF(_)
  21 #endif
  22 #if LJ_HASFFI
  23 #define FFIGOTDEF(_) \
  24   _(lj_meta_equal_cd) _(lj_ccallback_enter) _(lj_ccallback_leave)
  25 #else
  26 #define FFIGOTDEF(_)
  27 #endif
  28 #define GOTDEF(_) \
  29   _(floor) _(ceil) _(trunc) _(log) _(log10) _(exp) _(sin) _(cos) _(tan) \
  30   _(asin) _(acos) _(atan) _(sinh) _(cosh) _(tanh) _(frexp) _(modf) _(atan2) \
  31   _(pow) _(fmod) _(ldexp) \
  32   _(lj_dispatch_call) _(lj_dispatch_ins) _(lj_dispatch_stitch) \
  33   _(lj_dispatch_profile) _(lj_err_throw) \
  34   _(lj_ffh_coroutine_wrap_err) _(lj_func_closeuv) _(lj_func_newL_gc) \
  35   _(lj_gc_barrieruv) _(lj_gc_step) _(lj_gc_step_fixtop) _(lj_meta_arith) \
  36   _(lj_meta_call) _(lj_meta_cat) _(lj_meta_comp) _(lj_meta_equal) \
  37   _(lj_meta_for) _(lj_meta_istype) _(lj_meta_len) _(lj_meta_tget) \
  38   _(lj_meta_tset) _(lj_state_growstack) _(lj_strfmt_num) \
  39   _(lj_str_new) _(lj_tab_dup) _(lj_tab_get) _(lj_tab_getinth) _(lj_tab_len) \
  40   _(lj_tab_new) _(lj_tab_newkey) _(lj_tab_next) _(lj_tab_reasize) \
  41   _(lj_tab_setinth) _(lj_buf_putstr_reverse) _(lj_buf_putstr_lower) \
  42   _(lj_buf_putstr_upper) _(lj_buf_tostr) JITGOTDEF(_) FFIGOTDEF(_)
  43
  44 enum {
  45 #define GOTENUM(name) LJ_GOT_##name,
  46 GOTDEF(GOTENUM)
  47 #undef GOTENUM
  48   LJ_GOT__MAX
  49 };
  50 #endif
  51
  52 /* Type of hot counter. Must match the code in the assembler VM. */
  53 /* 16 bits are sufficient. Only 0.0015% overhead with maximum slot penalty. */
  54 typedef uint16_t HotCount;
  55
  56 /* Number of hot counter hash table entries (must be a power of two). */
  57 #define HOTCOUNT_SIZE           64
  58 #define HOTCOUNT_PCMASK         ((HOTCOUNT_SIZE-1)*sizeof(HotCount))
  59
  60 /* Hotcount decrements. */
  61 #define HOTCOUNT_LOOP           2
  62 #define HOTCOUNT_CALL           1
  63
  64 /* This solves a circular dependency problem -- bump as needed. Sigh. */
  65 #define GG_NUM_ASMFF    57
  66
  67 #define GG_LEN_DDISP    (BC__MAX + GG_NUM_ASMFF)
  68 #define GG_LEN_SDISP    BC_FUNCF
  69 #define GG_LEN_DISP     (GG_LEN_DDISP + GG_LEN_SDISP)
  70
  71 /* Global state, main thread and extra fields are allocated together. */
  72 typedef struct GG_State {
  73   lua_State L;                          /* Main thread. */
  74   global_State g;                       /* Global state. */
  75 #if LJ_TARGET_MIPS
  76   ASMFunction got[LJ_GOT__MAX];         /* Global offset table. */
  77 #endif
  78 #if LJ_HASJIT
  79   jit_State J;                          /* JIT state. */
  80   HotCount hotcount[HOTCOUNT_SIZE];     /* Hot counters. */
  81 #endif
  82   ASMFunction dispatch[GG_LEN_DISP];    /* Instruction dispatch tables. */
  83   BCIns bcff[GG_NUM_ASMFF];             /* Bytecode for ASM fast functions. */
  84 } GG_State;
  85
  86 #define GG_OFS(field)   ((int)offsetof(GG_State, field))
  87 #define G2GG(gl)        ((GG_State *)((char *)(gl) - GG_OFS(g)))
  88 #define J2GG(j)         ((GG_State *)((char *)(j) - GG_OFS(J)))
  89 #define L2GG(L)         (G2GG(G(L)))
  90 #define J2G(J)          (&J2GG(J)->g)
  91 #define G2J(gl)         (&G2GG(gl)->J)
  92 #define L2J(L)          (&L2GG(L)->J)
  93 #define GG_G2DISP       (GG_OFS(dispatch) - GG_OFS(g))
  94 #define GG_DISP2G       (GG_OFS(g) - GG_OFS(dispatch))
  95 #define GG_DISP2J       (GG_OFS(J) - GG_OFS(dispatch))
  96 #define GG_DISP2HOT     (GG_OFS(hotcount) - GG_OFS(dispatch))
  97 #define GG_DISP2STATIC  (GG_LEN_DDISP*(int)sizeof(ASMFunction))
  98
  99 #define hotcount_get(gg, pc) \
 100   (gg)->hotcount[(u32ptr(pc)>>2) & (HOTCOUNT_SIZE-1)]
 101 #define hotcount_set(gg, pc, val) \
 102   (hotcount_get((gg), (pc)) = (HotCount)(val))
 103
 104 /* Dispatch table management. */
 105 LJ_FUNC void lj_dispatch_init(GG_State *GG);
 106 #if LJ_HASJIT
 107 LJ_FUNC void lj_dispatch_init_hotcount(global_State *g);
 108 #endif
 109 LJ_FUNC void lj_dispatch_update(global_State *g);
 110
 111 /* Instruction dispatch callback for hooks or when recording. */
 112 LJ_FUNCA void LJ_FASTCALL lj_dispatch_ins(lua_State *L, const BCIns *pc);
 113 LJ_FUNCA ASMFunction LJ_FASTCALL lj_dispatch_call(lua_State *L, const BCIns*pc);
 114 #if LJ_HASJIT
 115 LJ_FUNCA void LJ_FASTCALL lj_dispatch_stitch(jit_State *J, const BCIns *pc);
 116 #endif
 117 #if LJ_HASPROFILE
 118 LJ_FUNCA void LJ_FASTCALL lj_dispatch_profile(lua_State *L, const BCIns *pc);
 119 #endif
 120
 121 #if LJ_HASFFI && !defined(_BUILDVM_H)
 122 /* Save/restore errno and GetLastError() around hooks, exits and recording. */
 123 #include <errno.h>
 124 #if LJ_TARGET_WINDOWS
 125 #define WIN32_LEAN_AND_MEAN
 126 #include <windows.h>
 127 #define ERRNO_SAVE      int olderr = errno; DWORD oldwerr = GetLastError();
 128 #define ERRNO_RESTORE   errno = olderr; SetLastError(oldwerr);
 129 #else
 130 #define ERRNO_SAVE      int olderr = errno;
 131 #define ERRNO_RESTORE   errno = olderr;
 132 #endif
 133 #else
 134 #define ERRNO_SAVE
 135 #define ERRNO_RESTORE
 136 #endif
 137
 138 #endif