1 /* $NetBSD: lparser.h,v 1.3 2015/02/02 14:03:05 lneto Exp $ */ 2 3 /* 4 ** Id: lparser.h,v 1.74 2014/10/25 11:50:46 roberto Exp 5 ** Lua Parser 6 ** See Copyright Notice in lua.h 7 */ 8 9 #ifndef lparser_h 10 #define lparser_h 11 12 #include "llimits.h" 13 #include "lobject.h" 14 #include "lzio.h" 15 16 17 /* 18 ** Expression descriptor 19 */ 20 21 typedef enum { 22 VVOID, /* no value */ 23 VNIL, 24 VTRUE, 25 VFALSE, 26 VK, /* info = index of constant in 'k' */ 27 #ifndef _KERNEL 28 VKFLT, /* nval = numerical float value */ 29 #endif 30 VKINT, /* nval = numerical integer value */ 31 VNONRELOC, /* info = result register */ 32 VLOCAL, /* info = local register */ 33 VUPVAL, /* info = index of upvalue in 'upvalues' */ 34 VINDEXED, /* t = table register/upvalue; idx = index R/K */ 35 VJMP, /* info = instruction pc */ 36 VRELOCABLE, /* info = instruction pc */ 37 VCALL, /* info = instruction pc */ 38 VVARARG /* info = instruction pc */ 39 } expkind; 40 41 42 #define vkisvar(k) (VLOCAL <= (k) && (k) <= VINDEXED) 43 #define vkisinreg(k) ((k) == VNONRELOC || (k) == VLOCAL) 44 45 typedef struct expdesc { 46 expkind k; 47 union { 48 struct { /* for indexed variables (VINDEXED) */ 49 short idx; /* index (R/K) */ 50 lu_byte t; /* table (register or upvalue) */ 51 lu_byte vt; /* whether 't' is register (VLOCAL) or upvalue (VUPVAL) */ 52 } ind; 53 int info; /* for generic use */ 54 #ifndef _KERNEL 55 lua_Number nval; /* for VKFLT */ 56 #endif 57 lua_Integer ival; /* for VKINT */ 58 } u; 59 int t; /* patch list of 'exit when true' */ 60 int f; /* patch list of 'exit when false' */ 61 } expdesc; 62 63 64 /* description of active local variable */ 65 typedef struct Vardesc { 66 short idx; /* variable index in stack */ 67 } Vardesc; 68 69 70 /* description of pending goto statements and label statements */ 71 typedef struct Labeldesc { 72 TString *name; /* label identifier */ 73 int pc; /* position in code */ 74 int line; /* line where it appeared */ 75 lu_byte nactvar; /* local level where it appears in current block */ 76 } Labeldesc; 77 78 79 /* list of labels or gotos */ 80 typedef struct Labellist { 81 Labeldesc *arr; /* array */ 82 int n; /* number of entries in use */ 83 int size; /* array size */ 84 } Labellist; 85 86 87 /* dynamic structures used by the parser */ 88 typedef struct Dyndata { 89 struct { /* list of active local variables */ 90 Vardesc *arr; 91 int n; 92 int size; 93 } actvar; 94 Labellist gt; /* list of pending gotos */ 95 Labellist label; /* list of active labels */ 96 } Dyndata; 97 98 99 /* control of blocks */ 100 struct BlockCnt; /* defined in lparser.c */ 101 102 103 /* state needed to generate code for a given function */ 104 typedef struct FuncState { 105 Proto *f; /* current function header */ 106 struct FuncState *prev; /* enclosing function */ 107 struct LexState *ls; /* lexical state */ 108 struct BlockCnt *bl; /* chain of current blocks */ 109 int pc; /* next position to code (equivalent to 'ncode') */ 110 int lasttarget; /* 'label' of last 'jump label' */ 111 int jpc; /* list of pending jumps to 'pc' */ 112 int nk; /* number of elements in 'k' */ 113 int np; /* number of elements in 'p' */ 114 int firstlocal; /* index of first local var (in Dyndata array) */ 115 short nlocvars; /* number of elements in 'f->locvars' */ 116 lu_byte nactvar; /* number of active local variables */ 117 lu_byte nups; /* number of upvalues */ 118 lu_byte freereg; /* first free register */ 119 } FuncState; 120 121 122 LUAI_FUNC LClosure *luaY_parser (lua_State *L, ZIO *z, Mbuffer *buff, 123 Dyndata *dyd, const char *name, int firstchar); 124 125 126 #endif 127