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/*
** Instruction dispatch handling.
** Copyright (C) 2005-2009 Mike Pall. See Copyright Notice in luajit.h
*/
#ifndef _LJ_DISPATCH_H
#define _LJ_DISPATCH_H
#include "lj_obj.h"
#include "lj_bc.h"
#if LJ_HASJIT
#include "lj_jit.h"
#endif
/* Type of hot counter. Must match the code in the assembler VM. */
/* 16 bits are sufficient. Only 0.0015% overhead with maximum slot penalty. */
typedef uint16_t HotCount;
/* Number of hot counter hash table entries (must be a power of two). */
#define HOTCOUNT_SIZE 64
#define HOTCOUNT_PCMASK ((HOTCOUNT_SIZE-1)*sizeof(HotCount))
#define HOTCOUNT_MIN_PENALTY 103
#define HOTCOUNT_MAX_PENALTY 60000
/* Global state, main thread and extra fields are allocated together. */
typedef struct GG_State {
lua_State L; /* Main thread. */
global_State g; /* Global state. */
#if LJ_HASJIT
jit_State J; /* JIT state. */
HotCount hotcount[HOTCOUNT_SIZE]; /* Hot counters. */
#endif
ASMFunction dispatch[2*BC__MAX]; /* Instruction dispatch tables. */
} GG_State;
#define GG_DISP_STATIC BC__MAX
#define GG_OFS(field) ((int)offsetof(GG_State, field))
#define G2GG(gl) \
((GG_State *)(((char *)(gl))-((char *)(&((GG_State *)0)->g))))
#define J2GG(j) \
((GG_State *)(((char *)(j))-((char *)(&((GG_State *)0)->J))))
#define L2GG(L) G2GG(G(L))
#define J2G(J) (&J2GG(J)->g)
#define G2J(gl) (&G2GG(gl)->J)
#define L2J(L) (&L2GG(L)->J)
#define GG_G2DISP (GG_OFS(dispatch) - GG_OFS(g))
#define GG_DISP2G (GG_OFS(g) - GG_OFS(dispatch))
#define GG_DISP2J (GG_OFS(J) - GG_OFS(dispatch))
#define GG_DISP2HOT (GG_OFS(hotcount) - GG_OFS(dispatch))
#define hotcount_get(gg, pc) \
(gg)->hotcount[(u32ptr(pc)>>2) & (HOTCOUNT_SIZE-1)]
#define hotcount_set(gg, pc, val) \
(hotcount_get((gg), (pc)) = (HotCount)(val))
/* Dispatch table management. */
LJ_FUNC void lj_dispatch_init(GG_State *GG);
LJ_FUNC void lj_dispatch_update(global_State *g);
/* Instruction dispatch callback for instr/line hooks or when recording. */
LJ_FUNCA void lj_dispatch_ins(lua_State *L, const BCIns *pc, uint32_t nres);
#endif
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