commit | author | age
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** $Id: lobject.h,v 2.20.1.2 2008/08/06 13:29:48 roberto Exp $ |
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** Type definitions for Lua objects |
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** See Copyright Notice in lua.h |
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*/ |
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#ifndef lobject_h |
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#define lobject_h |
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#include <stdarg.h> |
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#include "llimits.h" |
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#include "lua.h" |
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/* tags for values visible from Lua */ |
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#define LAST_TAG LUA_TTHREAD |
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#define NUM_TAGS (LAST_TAG+1) |
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/* |
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** Extra tags for non-values |
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*/ |
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#define LUA_TPROTO (LAST_TAG+1) |
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#define LUA_TUPVAL (LAST_TAG+2) |
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#define LUA_TDEADKEY (LAST_TAG+3) |
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/* |
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** Union of all collectable objects |
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*/ |
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typedef union GCObject GCObject; |
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/* |
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** Common Header for all collectable objects (in macro form, to be |
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** included in other objects) |
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*/ |
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#define CommonHeader GCObject *next; lu_byte tt; lu_byte marked |
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/* |
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** Common header in struct form |
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*/ |
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typedef struct GCheader { |
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CommonHeader; |
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} GCheader; |
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/* |
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** Union of all Lua values |
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*/ |
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typedef union { |
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GCObject *gc; |
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void *p; |
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lua_Number n; |
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int b; |
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} Value; |
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/* |
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** Tagged Values |
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*/ |
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#define TValuefields Value value; int tt |
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typedef struct lua_TValue { |
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TValuefields; |
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} TValue; |
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/* Macros to test type */ |
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#define ttisnil(o) (ttype(o) == LUA_TNIL) |
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#define ttisnumber(o) (ttype(o) == LUA_TNUMBER) |
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#define ttisstring(o) (ttype(o) == LUA_TSTRING) |
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#define ttistable(o) (ttype(o) == LUA_TTABLE) |
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#define ttisfunction(o) (ttype(o) == LUA_TFUNCTION) |
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#define ttisboolean(o) (ttype(o) == LUA_TBOOLEAN) |
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#define ttisuserdata(o) (ttype(o) == LUA_TUSERDATA) |
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#define ttisthread(o) (ttype(o) == LUA_TTHREAD) |
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#define ttislightuserdata(o) (ttype(o) == LUA_TLIGHTUSERDATA) |
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/* Macros to access values */ |
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#define ttype(o) ((o)->tt) |
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#define gcvalue(o) check_exp(iscollectable(o), (o)->value.gc) |
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#define pvalue(o) check_exp(ttislightuserdata(o), (o)->value.p) |
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#define nvalue(o) check_exp(ttisnumber(o), (o)->value.n) |
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#define rawtsvalue(o) check_exp(ttisstring(o), &(o)->value.gc->ts) |
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#define tsvalue(o) (&rawtsvalue(o)->tsv) |
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#define rawuvalue(o) check_exp(ttisuserdata(o), &(o)->value.gc->u) |
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#define uvalue(o) (&rawuvalue(o)->uv) |
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#define clvalue(o) check_exp(ttisfunction(o), &(o)->value.gc->cl) |
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#define hvalue(o) check_exp(ttistable(o), &(o)->value.gc->h) |
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#define bvalue(o) check_exp(ttisboolean(o), (o)->value.b) |
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#define thvalue(o) check_exp(ttisthread(o), &(o)->value.gc->th) |
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#define l_isfalse(o) (ttisnil(o) || (ttisboolean(o) && bvalue(o) == 0)) |
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/* |
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** for internal debug only |
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*/ |
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#define checkconsistency(obj) \ |
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lua_assert(!iscollectable(obj) || (ttype(obj) == (obj)->value.gc->gch.tt)) |
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#define checkliveness(g,obj) \ |
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lua_assert(!iscollectable(obj) || \ |
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((ttype(obj) == (obj)->value.gc->gch.tt) && !isdead(g, (obj)->value.gc))) |
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/* Macros to set values */ |
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#define setnilvalue(obj) ((obj)->tt=LUA_TNIL) |
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#define setnvalue(obj,x) \ |
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{ TValue *i_o=(obj); i_o->value.n=(x); i_o->tt=LUA_TNUMBER; } |
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#define setpvalue(obj,x) \ |
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{ TValue *i_o=(obj); i_o->value.p=(x); i_o->tt=LUA_TLIGHTUSERDATA; } |
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#define setbvalue(obj,x) \ |
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{ TValue *i_o=(obj); i_o->value.b=(x); i_o->tt=LUA_TBOOLEAN; } |
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#define setsvalue(L,obj,x) \ |
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{ TValue *i_o=(obj); \ |
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i_o->value.gc=cast(GCObject *, (x)); i_o->tt=LUA_TSTRING; \ |
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checkliveness(G(L),i_o); } |
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#define setuvalue(L,obj,x) \ |
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{ TValue *i_o=(obj); \ |
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i_o->value.gc=cast(GCObject *, (x)); i_o->tt=LUA_TUSERDATA; \ |
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checkliveness(G(L),i_o); } |
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#define setthvalue(L,obj,x) \ |
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{ TValue *i_o=(obj); \ |
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i_o->value.gc=cast(GCObject *, (x)); i_o->tt=LUA_TTHREAD; \ |
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checkliveness(G(L),i_o); } |
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#define setclvalue(L,obj,x) \ |
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{ TValue *i_o=(obj); \ |
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i_o->value.gc=cast(GCObject *, (x)); i_o->tt=LUA_TFUNCTION; \ |
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checkliveness(G(L),i_o); } |
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#define sethvalue(L,obj,x) \ |
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{ TValue *i_o=(obj); \ |
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i_o->value.gc=cast(GCObject *, (x)); i_o->tt=LUA_TTABLE; \ |
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checkliveness(G(L),i_o); } |
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#define setptvalue(L,obj,x) \ |
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{ TValue *i_o=(obj); \ |
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i_o->value.gc=cast(GCObject *, (x)); i_o->tt=LUA_TPROTO; \ |
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checkliveness(G(L),i_o); } |
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#define setobj(L,obj1,obj2) \ |
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{ const TValue *o2=(obj2); TValue *o1=(obj1); \ |
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o1->value = o2->value; o1->tt=o2->tt; \ |
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checkliveness(G(L),o1); } |
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/* |
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** different types of sets, according to destination |
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*/ |
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/* from stack to (same) stack */ |
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#define setobjs2s setobj |
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/* to stack (not from same stack) */ |
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#define setobj2s setobj |
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#define setsvalue2s setsvalue |
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#define sethvalue2s sethvalue |
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#define setptvalue2s setptvalue |
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/* from table to same table */ |
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#define setobjt2t setobj |
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/* to table */ |
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#define setobj2t setobj |
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/* to new object */ |
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#define setobj2n setobj |
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#define setsvalue2n setsvalue |
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#define setttype(obj, tt) (ttype(obj) = (tt)) |
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#define iscollectable(o) (ttype(o) >= LUA_TSTRING) |
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typedef TValue *StkId; /* index to stack elements */ |
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/* |
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** String headers for string table |
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*/ |
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typedef union TString { |
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L_Umaxalign dummy; /* ensures maximum alignment for strings */ |
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struct { |
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CommonHeader; |
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lu_byte reserved; |
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unsigned int hash; |
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size_t len; |
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} tsv; |
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} TString; |
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#define getstr(ts) cast(const char *, (ts) + 1) |
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#define svalue(o) getstr(rawtsvalue(o)) |
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typedef union Udata { |
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L_Umaxalign dummy; /* ensures maximum alignment for `local' udata */ |
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struct { |
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CommonHeader; |
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struct Table *metatable; |
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struct Table *env; |
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size_t len; |
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} uv; |
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} Udata; |
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/* |
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** Function Prototypes |
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*/ |
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typedef struct Proto { |
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CommonHeader; |
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TValue *k; /* constants used by the function */ |
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Instruction *code; |
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struct Proto **p; /* functions defined inside the function */ |
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int *lineinfo; /* map from opcodes to source lines */ |
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struct LocVar *locvars; /* information about local variables */ |
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TString **upvalues; /* upvalue names */ |
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TString *source; |
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int sizeupvalues; |
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int sizek; /* size of `k' */ |
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int sizecode; |
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int sizelineinfo; |
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int sizep; /* size of `p' */ |
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int sizelocvars; |
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int linedefined; |
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int lastlinedefined; |
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GCObject *gclist; |
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lu_byte nups; /* number of upvalues */ |
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lu_byte numparams; |
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lu_byte is_vararg; |
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lu_byte maxstacksize; |
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} Proto; |
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/* masks for new-style vararg */ |
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#define VARARG_HASARG 1 |
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#define VARARG_ISVARARG 2 |
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#define VARARG_NEEDSARG 4 |
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typedef struct LocVar { |
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TString *varname; |
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int startpc; /* first point where variable is active */ |
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int endpc; /* first point where variable is dead */ |
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} LocVar; |
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/* |
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** Upvalues |
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*/ |
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typedef struct UpVal { |
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CommonHeader; |
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TValue *v; /* points to stack or to its own value */ |
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union { |
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TValue value; /* the value (when closed) */ |
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struct { /* double linked list (when open) */ |
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struct UpVal *prev; |
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struct UpVal *next; |
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} l; |
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} u; |
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} UpVal; |
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/* |
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** Closures |
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*/ |
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#define ClosureHeader \ |
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CommonHeader; lu_byte isC; lu_byte nupvalues; GCObject *gclist; \ |
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struct Table *env |
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typedef struct CClosure { |
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ClosureHeader; |
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lua_CFunction f; |
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TValue upvalue[1]; |
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} CClosure; |
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typedef struct LClosure { |
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ClosureHeader; |
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struct Proto *p; |
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UpVal *upvals[1]; |
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} LClosure; |
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typedef union Closure { |
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CClosure c; |
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LClosure l; |
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} Closure; |
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#define iscfunction(o) (ttype(o) == LUA_TFUNCTION && clvalue(o)->c.isC) |
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#define isLfunction(o) (ttype(o) == LUA_TFUNCTION && !clvalue(o)->c.isC) |
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/* |
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** Tables |
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*/ |
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typedef union TKey { |
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struct { |
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TValuefields; |
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struct Node *next; /* for chaining */ |
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} nk; |
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TValue tvk; |
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} TKey; |
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typedef struct Node { |
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TValue i_val; |
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TKey i_key; |
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} Node; |
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typedef struct Table { |
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CommonHeader; |
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lu_byte flags; /* 1<<p means tagmethod(p) is not present */ |
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lu_byte lsizenode; /* log2 of size of `node' array */ |
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struct Table *metatable; |
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TValue *array; /* array part */ |
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Node *node; |
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Node *lastfree; /* any free position is before this position */ |
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GCObject *gclist; |
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int sizearray; /* size of `array' array */ |
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} Table; |
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/* |
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** `module' operation for hashing (size is always a power of 2) |
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*/ |
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#define lmod(s,size) \ |
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(check_exp((size&(size-1))==0, (cast(int, (s) & ((size)-1))))) |
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#define twoto(x) (1<<(x)) |
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#define sizenode(t) (twoto((t)->lsizenode)) |
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#define luaO_nilobject (&luaO_nilobject_) |
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LUAI_DATA const TValue luaO_nilobject_; |
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#define ceillog2(x) (luaO_log2((x)-1) + 1) |
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LUAI_FUNC int luaO_log2 (unsigned int x); |
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LUAI_FUNC int luaO_int2fb (unsigned int x); |
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LUAI_FUNC int luaO_fb2int (int x); |
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LUAI_FUNC int luaO_rawequalObj (const TValue *t1, const TValue *t2); |
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LUAI_FUNC int luaO_str2d (const char *s, lua_Number *result); |
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LUAI_FUNC const char *luaO_pushvfstring (lua_State *L, const char *fmt, |
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va_list argp); |
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LUAI_FUNC const char *luaO_pushfstring (lua_State *L, const char *fmt, ...); |
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LUAI_FUNC void luaO_chunkid (char *out, const char *source, size_t len); |
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#endif |
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