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