projects / ceph.git / blame
| Commit | Line | Data |
|---|---|---|
| 7c673cae FG |
1 | /* |
| 2 | ** $Id: lparser.h,v 1.74 2014/10/25 11:50:46 roberto Exp $ | |
| 3 | ** Lua Parser | |
| 4 | ** See Copyright Notice in lua.h | |
| 5 | */ | |
| 6 | ||
| 7 | #ifndef lparser_h | |
| 8 | #define lparser_h | |
| 9 | ||
| 10 | #include "llimits.h" | |
| 11 | #include "lobject.h" | |
| 12 | #include "lzio.h" | |
| 13 | ||
| 14 | ||
| 15 | /* | |
| 16 | ** Expression descriptor | |
| 17 | */ | |
| 18 | ||
| 19 | typedef enum { | |
| 20 | VVOID, /* no value */ | |
| 21 | VNIL, | |
| 22 | VTRUE, | |
| 23 | VFALSE, | |
| 24 | VK, /* info = index of constant in 'k' */ | |
| 25 | VKFLT, /* nval = numerical float value */ | |
| 26 | VKINT, /* nval = numerical integer value */ | |
| 27 | VNONRELOC, /* info = result register */ | |
| 28 | VLOCAL, /* info = local register */ | |
| 29 | VUPVAL, /* info = index of upvalue in 'upvalues' */ | |
| 30 | VINDEXED, /* t = table register/upvalue; idx = index R/K */ | |
| 31 | VJMP, /* info = instruction pc */ | |
| 32 | VRELOCABLE, /* info = instruction pc */ | |
| 33 | VCALL, /* info = instruction pc */ | |
| 34 | VVARARG /* info = instruction pc */ | |
| 35 | } expkind; | |
| 36 | ||
| 37 | ||
| 38 | #define vkisvar(k) (VLOCAL <= (k) && (k) <= VINDEXED) | |
| 39 | #define vkisinreg(k) ((k) == VNONRELOC || (k) == VLOCAL) | |
| 40 | ||
| 41 | typedef struct expdesc { | |
| 42 | expkind k; | |
| 43 | union { | |
| 44 | struct { /* for indexed variables (VINDEXED) */ | |
| 45 | short idx; /* index (R/K) */ | |
| 46 | lu_byte t; /* table (register or upvalue) */ | |
| 47 | lu_byte vt; /* whether 't' is register (VLOCAL) or upvalue (VUPVAL) */ | |
| 48 | } ind; | |
| 49 | int info; /* for generic use */ | |
| 50 | lua_Number nval; /* for VKFLT */ | |
| 51 | lua_Integer ival; /* for VKINT */ | |
| 52 | } u; | |
| 53 | int t; /* patch list of 'exit when true' */ | |
| 54 | int f; /* patch list of 'exit when false' */ | |
| 55 | } expdesc; | |
| 56 | ||
| 57 | ||
| 58 | /* description of active local variable */ | |
| 59 | typedef struct Vardesc { | |
| 60 | short idx; /* variable index in stack */ | |
| 61 | } Vardesc; | |
| 62 | ||
| 63 | ||
| 64 | /* description of pending goto statements and label statements */ | |
| 65 | typedef struct Labeldesc { | |
| 66 | TString *name; /* label identifier */ | |
| 67 | int pc; /* position in code */ | |
| 68 | int line; /* line where it appeared */ | |
| 69 | lu_byte nactvar; /* local level where it appears in current block */ | |
| 70 | } Labeldesc; | |
| 71 | ||
| 72 | ||
| 73 | /* list of labels or gotos */ | |
| 74 | typedef struct Labellist { | |
| 75 | Labeldesc *arr; /* array */ | |
| 76 | int n; /* number of entries in use */ | |
| 77 | int size; /* array size */ | |
| 78 | } Labellist; | |
| 79 | ||
| 80 | ||
| 81 | /* dynamic structures used by the parser */ | |
| 82 | typedef struct Dyndata { | |
| 83 | struct { /* list of active local variables */ | |
| 84 | Vardesc *arr; | |
| 85 | int n; | |
| 86 | int size; | |
| 87 | } actvar; | |
| 88 | Labellist gt; /* list of pending gotos */ | |
| 89 | Labellist label; /* list of active labels */ | |
| 90 | } Dyndata; | |
| 91 | ||
| 92 | ||
| 93 | /* control of blocks */ | |
| 94 | struct BlockCnt; /* defined in lparser.c */ | |
| 95 | ||
| 96 | ||
| 97 | /* state needed to generate code for a given function */ | |
| 98 | typedef struct FuncState { | |
| 99 | Proto *f; /* current function header */ | |
| 100 | struct FuncState *prev; /* enclosing function */ | |
| 101 | struct LexState *ls; /* lexical state */ | |
| 102 | struct BlockCnt *bl; /* chain of current blocks */ | |
| 103 | int pc; /* next position to code (equivalent to 'ncode') */ | |
| 104 | int lasttarget; /* 'label' of last 'jump label' */ | |
| 105 | int jpc; /* list of pending jumps to 'pc' */ | |
| 106 | int nk; /* number of elements in 'k' */ | |
| 107 | int np; /* number of elements in 'p' */ | |
| 108 | int firstlocal; /* index of first local var (in Dyndata array) */ | |
| 109 | short nlocvars; /* number of elements in 'f->locvars' */ | |
| 110 | lu_byte nactvar; /* number of active local variables */ | |
| 111 | lu_byte nups; /* number of upvalues */ | |
| 112 | lu_byte freereg; /* first free register */ | |
| 113 | } FuncState; | |
| 114 | ||
| 115 | ||
| 116 | LUAI_FUNC LClosure *luaY_parser (lua_State *L, ZIO *z, Mbuffer *buff, | |
| 117 | Dyndata *dyd, const char *name, int firstchar); | |
| 118 | ||
| 119 | ||
| 120 | #endif |