mirror of
https://github.com/lua/lua.git
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b42430fd3a
values, so that the array can use bytes instead of ints, reducing its size. (A new array 'abslineinfo' is used when line differences do not fit in a byte.)
636 lines
17 KiB
C
636 lines
17 KiB
C
/*
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** $Id: lobject.h,v 2.123 2017/06/12 14:21:44 roberto Exp roberto $
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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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/*
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** Extra tags for non-values
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*/
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#define LUA_TUPVAL LUA_NUMTAGS /* upvalues */
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#define LUA_TPROTO (LUA_NUMTAGS+1) /* function prototypes */
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/*
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** number of all possible tags (including LUA_TNONE)
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*/
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#define LUA_TOTALTAGS (LUA_TPROTO + 2)
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/*
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** tags for Tagged Values have the following use of bits:
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** bits 0-3: actual tag (a LUA_T* value)
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** bits 4-5: variant bits
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** bit 6: whether value is collectable
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*/
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/*
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** LUA_TFUNCTION variants:
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** 0 - Lua function
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** 1 - light C function
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** 2 - regular C function (closure)
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*/
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/* Variant tags for functions */
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#define LUA_TLCL (LUA_TFUNCTION | (0 << 4)) /* Lua closure */
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#define LUA_TLCF (LUA_TFUNCTION | (1 << 4)) /* light C function */
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#define LUA_TCCL (LUA_TFUNCTION | (2 << 4)) /* C closure */
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/* Variant tags for strings */
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#define LUA_TSHRSTR (LUA_TSTRING | (0 << 4)) /* short strings */
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#define LUA_TLNGSTR (LUA_TSTRING | (1 << 4)) /* long strings */
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/* Variant tags for numbers */
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#define LUA_TNUMFLT (LUA_TNUMBER | (0 << 4)) /* float numbers */
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#define LUA_TNUMINT (LUA_TNUMBER | (1 << 4)) /* integer numbers */
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/* Bit mark for collectable types */
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#define BIT_ISCOLLECTABLE (1 << 6)
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/* mark a tag as collectable */
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#define ctb(t) ((t) | BIT_ISCOLLECTABLE)
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/*
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** Common type for all collectable objects
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*/
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typedef struct 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 type has only the common header
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*/
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struct GCObject {
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CommonHeader;
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};
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/*
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** Tagged Values. This is the basic representation of values in Lua,
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** an actual value plus a tag with its type.
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*/
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/*
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** Union of all Lua values
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*/
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typedef union Value {
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GCObject *gc; /* collectable objects */
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void *p; /* light userdata */
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int b; /* booleans */
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lua_CFunction f; /* light C functions */
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lua_Integer i; /* integer numbers */
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lua_Number n; /* float numbers */
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} Value;
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#define TValuefields Value value_; lu_byte tt_
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typedef struct lua_TValue {
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TValuefields;
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} TValue;
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/* macro defining a nil value */
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#define NILCONSTANT {NULL}, LUA_TNIL
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#define val_(o) ((o)->value_)
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#define valraw(o) (&val_(o))
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/* raw type tag of a TValue */
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#define rttype(o) ((o)->tt_)
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/* tag with no variants (bits 0-3) */
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#define novariant(x) ((x) & 0x0F)
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/* type tag of a TValue (bits 0-3 for tags + variant bits 4-5) */
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#define ttyperaw(t) ((t) & 0x3F)
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#define ttype(o) ttyperaw(rttype(o))
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/* type tag of a TValue with no variants (bits 0-3) */
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#define ttnov(o) (novariant(rttype(o)))
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/* Macros to test type */
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#define checktag(o,t) (rttype(o) == (t))
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#define checktype(o,t) (ttnov(o) == (t))
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#define ttisnumber(o) checktype((o), LUA_TNUMBER)
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#define ttisfloat(o) checktag((o), LUA_TNUMFLT)
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#define ttisinteger(o) checktag((o), LUA_TNUMINT)
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#define ttisnil(o) checktag((o), LUA_TNIL)
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#define ttisboolean(o) checktag((o), LUA_TBOOLEAN)
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#define ttislightuserdata(o) checktag((o), LUA_TLIGHTUSERDATA)
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#define ttisstring(o) checktype((o), LUA_TSTRING)
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#define ttisshrstring(o) checktag((o), ctb(LUA_TSHRSTR))
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#define ttislngstring(o) checktag((o), ctb(LUA_TLNGSTR))
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#define ttistable(o) checktag((o), ctb(LUA_TTABLE))
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#define ttisfunction(o) checktype(o, LUA_TFUNCTION)
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#define ttisclosure(o) ((rttype(o) & 0x1F) == LUA_TFUNCTION)
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#define ttisCclosure(o) checktag((o), ctb(LUA_TCCL))
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#define ttisLclosure(o) checktag((o), ctb(LUA_TLCL))
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#define ttislcf(o) checktag((o), LUA_TLCF)
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#define ttisfulluserdata(o) checktag((o), ctb(LUA_TUSERDATA))
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#define ttisthread(o) checktag((o), ctb(LUA_TTHREAD))
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/*
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** Macros to access unstructured values (may come both from
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** 'TValue's and table keys)
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*/
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#define ivalueraw(v) ((v).i)
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#define fltvalueraw(v) ((v).n)
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#define gcvalueraw(v) ((v).gc)
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#define pvalueraw(v) ((v).p)
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#define tsvalueraw(v) (gco2ts((v).gc))
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#define fvalueraw(v) ((v).f)
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#define bvalueraw(v) ((v).b)
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/* Macros to access values */
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#define ivalue(o) check_exp(ttisinteger(o), val_(o).i)
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#define fltvalue(o) check_exp(ttisfloat(o), val_(o).n)
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#define nvalue(o) check_exp(ttisnumber(o), \
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(ttisinteger(o) ? cast_num(ivalue(o)) : fltvalue(o)))
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#define gcvalue(o) check_exp(iscollectable(o), val_(o).gc)
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#define pvalue(o) check_exp(ttislightuserdata(o), val_(o).p)
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#define tsvalue(o) check_exp(ttisstring(o), gco2ts(val_(o).gc))
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#define uvalue(o) check_exp(ttisfulluserdata(o), gco2u(val_(o).gc))
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#define clvalue(o) check_exp(ttisclosure(o), gco2cl(val_(o).gc))
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#define clLvalue(o) check_exp(ttisLclosure(o), gco2lcl(val_(o).gc))
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#define clCvalue(o) check_exp(ttisCclosure(o), gco2ccl(val_(o).gc))
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#define fvalue(o) check_exp(ttislcf(o), val_(o).f)
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#define hvalue(o) check_exp(ttistable(o), gco2t(val_(o).gc))
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#define bvalue(o) check_exp(ttisboolean(o), val_(o).b)
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#define thvalue(o) check_exp(ttisthread(o), gco2th(val_(o).gc))
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#define l_isfalse(o) (ttisnil(o) || (ttisboolean(o) && bvalue(o) == 0))
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#define iscollectable(o) (rttype(o) & BIT_ISCOLLECTABLE)
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/*
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** Protected access to objects in values
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*/
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#define gcvalueN(o) (iscollectable(o) ? gcvalue(o) : NULL)
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/* Macros for internal tests */
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#define righttt(obj) (ttype(obj) == gcvalue(obj)->tt)
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#define checkliveness(L,obj) \
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lua_longassert(!iscollectable(obj) || \
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(righttt(obj) && (L == NULL || !isdead(G(L),gcvalue(obj)))))
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/* Macros to set values */
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#define settt_(o,t) ((o)->tt_=(t))
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#define setfltvalue(obj,x) \
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{ TValue *io=(obj); val_(io).n=(x); settt_(io, LUA_TNUMFLT); }
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#define chgfltvalue(obj,x) \
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{ TValue *io=(obj); lua_assert(ttisfloat(io)); val_(io).n=(x); }
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#define setivalue(obj,x) \
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{ TValue *io=(obj); val_(io).i=(x); settt_(io, LUA_TNUMINT); }
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#define chgivalue(obj,x) \
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{ TValue *io=(obj); lua_assert(ttisinteger(io)); val_(io).i=(x); }
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#define setnilvalue(obj) settt_(obj, LUA_TNIL)
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#define setfvalue(obj,x) \
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{ TValue *io=(obj); val_(io).f=(x); settt_(io, LUA_TLCF); }
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#define setpvalue(obj,x) \
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{ TValue *io=(obj); val_(io).p=(x); settt_(io, LUA_TLIGHTUSERDATA); }
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#define setbvalue(obj,x) \
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{ TValue *io=(obj); val_(io).b=(x); settt_(io, LUA_TBOOLEAN); }
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#define setgcovalue(L,obj,x) \
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{ TValue *io = (obj); GCObject *i_g=(x); \
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val_(io).gc = i_g; settt_(io, ctb(i_g->tt)); }
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#define setsvalue(L,obj,x) \
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{ TValue *io = (obj); TString *x_ = (x); \
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val_(io).gc = obj2gco(x_); settt_(io, ctb(x_->tt)); \
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checkliveness(L,io); }
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#define setuvalue(L,obj,x) \
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{ TValue *io = (obj); Udata *x_ = (x); \
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val_(io).gc = obj2gco(x_); settt_(io, ctb(LUA_TUSERDATA)); \
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checkliveness(L,io); }
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#define setthvalue(L,obj,x) \
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{ TValue *io = (obj); lua_State *x_ = (x); \
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val_(io).gc = obj2gco(x_); settt_(io, ctb(LUA_TTHREAD)); \
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checkliveness(L,io); }
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#define setclLvalue(L,obj,x) \
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{ TValue *io = (obj); LClosure *x_ = (x); \
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val_(io).gc = obj2gco(x_); settt_(io, ctb(LUA_TLCL)); \
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checkliveness(L,io); }
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#define setclCvalue(L,obj,x) \
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{ TValue *io = (obj); CClosure *x_ = (x); \
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val_(io).gc = obj2gco(x_); settt_(io, ctb(LUA_TCCL)); \
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checkliveness(L,io); }
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#define sethvalue(L,obj,x) \
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{ TValue *io = (obj); Table *x_ = (x); \
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val_(io).gc = obj2gco(x_); settt_(io, ctb(LUA_TTABLE)); \
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checkliveness(L,io); }
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#define setobj(L,obj1,obj2) \
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{ TValue *io1=(obj1); const TValue *io2=(obj2); \
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io1->value_ = io2->value_; io1->tt_ = io2->tt_; \
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(void)L; checkliveness(L,io1); }
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/*
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** different types of assignments, 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 new object */
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#define setobj2n setobj
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#define setsvalue2n setsvalue
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/* to table */
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#define setobj2t setobj
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/*
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** {======================================================
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** types and prototypes
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** =======================================================
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*/
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typedef TValue *StkId; /* index to stack elements */
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/*
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** Header for string value; string bytes follow the end of this structure
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** (aligned according to 'UTString'; see next).
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*/
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typedef struct TString {
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CommonHeader;
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lu_byte extra; /* reserved words for short strings; "has hash" for longs */
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lu_byte shrlen; /* length for short strings */
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unsigned int hash;
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union {
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size_t lnglen; /* length for long strings */
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struct TString *hnext; /* linked list for hash table */
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} u;
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} TString;
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/*
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** Ensures that address after this type is always fully aligned.
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*/
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typedef union UTString {
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LUAI_MAXALIGN; /* ensures maximum alignment for strings */
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TString tsv;
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} UTString;
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/*
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** Get the actual string (array of bytes) from a 'TString'.
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** (Access to 'extra' ensures that value is really a 'TString'.)
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*/
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#define getstr(ts) \
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check_exp(sizeof((ts)->extra), cast(char *, (ts)) + sizeof(UTString))
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/* get the actual string (array of bytes) from a Lua value */
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#define svalue(o) getstr(tsvalue(o))
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/* get string length from 'TString *s' */
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#define tsslen(s) ((s)->tt == LUA_TSHRSTR ? (s)->shrlen : (s)->u.lnglen)
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/* get string length from 'TValue *o' */
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#define vslen(o) tsslen(tsvalue(o))
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/*
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** Header for userdata; memory area follows the end of this structure
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** (aligned according to 'UUdata'; see next).
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*/
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typedef struct Udata {
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CommonHeader;
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lu_byte ttuv_; /* user value's tag */
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struct Table *metatable;
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size_t len; /* number of bytes */
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union Value user_; /* user value */
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} Udata;
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/*
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** Ensures that address after this type is always fully aligned.
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*/
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typedef union UUdata {
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LUAI_MAXALIGN; /* ensures maximum alignment for 'local' udata */
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Udata uv;
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} UUdata;
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/*
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** Get the address of memory block inside 'Udata'.
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** (Access to 'ttuv_' ensures that value is really a 'Udata'.)
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*/
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#define getudatamem(u) \
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check_exp(sizeof((u)->ttuv_), (cast(char*, (u)) + sizeof(UUdata)))
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#define setuservalue(L,u,o) \
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{ const TValue *io=(o); Udata *iu = (u); \
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iu->user_ = io->value_; iu->ttuv_ = rttype(io); \
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checkliveness(L,io); }
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#define getuservalue(L,u,o) \
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{ TValue *io=(o); const Udata *iu = (u); \
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io->value_ = iu->user_; settt_(io, iu->ttuv_); \
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checkliveness(L,io); }
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/*
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** Description of an upvalue for function prototypes
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*/
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typedef struct Upvaldesc {
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TString *name; /* upvalue name (for debug information) */
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lu_byte instack; /* whether it is in stack (register) */
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lu_byte idx; /* index of upvalue (in stack or in outer function's list) */
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} Upvaldesc;
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/*
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** Description of a local variable for function prototypes
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** (used for debug information)
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*/
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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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** Associates the absolute line source for a given instruction ('pc').
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** The array 'lineinfo' gives, for each instruction, the difference in
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** lines from the previous instruction. When that difference does not
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** fit into a byte, Lua saves the absolute line for that instruction.
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** (Lua also saves the absolute line periodically, to speed up the
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** computation of a line number: we can use binary search in the
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** absolute-line array, but we must traverse the 'lineinfo' array
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** linearly to compute a line.)
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*/
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typedef struct AbsLineInfo {
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int pc;
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int line;
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} AbsLineInfo;
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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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lu_byte numparams; /* number of fixed parameters */
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lu_byte is_vararg;
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lu_byte maxstacksize; /* number of registers needed by this function */
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lu_byte cachemiss; /* count for successive misses for 'cache' field */
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int sizeupvalues; /* size of 'upvalues' */
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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 sizeabslineinfo; /* size of 'abslineinfo' */
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int linedefined; /* debug information */
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int lastlinedefined; /* debug information */
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TValue *k; /* constants used by the function */
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struct LClosure *cache; /* last-created closure with this prototype */
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Instruction *code; /* opcodes */
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struct Proto **p; /* functions defined inside the function */
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Upvaldesc *upvalues; /* upvalue information */
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ls_byte *lineinfo; /* information about source lines (debug information) */
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AbsLineInfo *abslineinfo; /* idem */
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LocVar *locvars; /* information about local variables (debug information) */
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TString *source; /* used for debug information */
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GCObject *gclist;
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} Proto;
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/*
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** Upvalues for Lua closures
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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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struct { /* (when open) */
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struct UpVal *next; /* linked list */
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struct UpVal **previous;
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} open;
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TValue value; /* the value (when closed) */
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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 nupvalues; GCObject *gclist
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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]; /* list of upvalues */
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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]; /* list of upvalues */
|
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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 isLfunction(o) ttisLclosure(o)
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|
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#define getproto(o) (clLvalue(o)->p)
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/*
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** Tables
|
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*/
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|
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/*
|
|
** Nodes for Hash tables. A pack of two TValue's (key-value pairs)
|
|
** plus a 'next' field to link colliding entries. The distribuition
|
|
** of the key's fields ('key_tt' and 'key_val') not forming a proper
|
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** 'TValue' allows for a smaller size for 'Node' both in 4-byte
|
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** and 8-byte alignments.
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*/
|
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typedef union Node {
|
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struct NodeKey {
|
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TValuefields; /* fields for value */
|
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lu_byte key_tt; /* key type */
|
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int next; /* for chaining */
|
|
Value key_val; /* key value */
|
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} u;
|
|
TValue i_val; /* direct access to node's value as a proper 'TValue' */
|
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} Node;
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|
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/* copy a value into a key */
|
|
#define setnodekey(L,node,obj) \
|
|
{ Node *n_=(node); const TValue *io_=(obj); \
|
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n_->u.key_val = io_->value_; n_->u.key_tt = io_->tt_; \
|
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(void)L; checkliveness(L,io_); }
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|
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/* copy a value from a key */
|
|
#define getnodekey(L,obj,node) \
|
|
{ TValue *io_=(obj); const Node *n_=(node); \
|
|
io_->value_ = n_->u.key_val; io_->tt_ = n_->u.key_tt; \
|
|
(void)L; checkliveness(L,io_); }
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|
|
typedef struct Table {
|
|
CommonHeader;
|
|
lu_byte flags; /* 1<<p means tagmethod(p) is not present */
|
|
lu_byte lsizenode; /* log2 of size of 'node' array */
|
|
unsigned int sizearray; /* size of 'array' array */
|
|
TValue *array; /* array part */
|
|
Node *node;
|
|
Node *lastfree; /* any free position is before this position */
|
|
struct Table *metatable;
|
|
GCObject *gclist;
|
|
} Table;
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|
|
/*
|
|
** Macros to manipulate keys inserted in nodes
|
|
*/
|
|
#define keytt(node) ((node)->u.key_tt)
|
|
#define keyval(node) ((node)->u.key_val)
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|
|
#define keyisnil(node) (keytt(node) == LUA_TNIL)
|
|
#define keyisinteger(node) (keytt(node) == LUA_TNUMINT)
|
|
#define keyival(node) (keyval(node).i)
|
|
#define keyisshrstr(node) (keytt(node) == ctb(LUA_TSHRSTR))
|
|
#define keystrval(node) (gco2ts(keyval(node).gc))
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|
|
#define setnilkey(node) (keytt(node) = LUA_TNIL)
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|
|
#define keyiscollectable(n) (keytt(n) & BIT_ISCOLLECTABLE)
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|
|
#define gckey(n) (keyval(n).gc)
|
|
#define gckeyN(n) (keyiscollectable(n) ? gckey(n) : NULL)
|
|
|
|
|
|
/*
|
|
** Use a "nil table" to mark dead keys in a table. Those keys serve
|
|
** only to keep space for removed entries, which may still be part of
|
|
** chains. Note that the 'keytt' does not have the BIT_ISCOLLECTABLE
|
|
** set, so these values are considered not collectable and are different
|
|
** from any valid value.
|
|
*/
|
|
#define setdeadkey(n) (keytt(n) = LUA_TTABLE, gckey(n) = NULL)
|
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|
|
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|
|
/*
|
|
** 'module' operation for hashing (size is always a power of 2)
|
|
*/
|
|
#define lmod(s,size) \
|
|
(check_exp((size&(size-1))==0, (cast(int, (s) & ((size)-1)))))
|
|
|
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|
|
#define twoto(x) (1<<(x))
|
|
#define sizenode(t) (twoto((t)->lsizenode))
|
|
|
|
|
|
/*
|
|
** (address of) a fixed nil value
|
|
*/
|
|
#define luaO_nilobject (&luaO_nilobject_)
|
|
|
|
|
|
LUAI_DDEC const TValue luaO_nilobject_;
|
|
|
|
/* size of buffer for 'luaO_utf8esc' function */
|
|
#define UTF8BUFFSZ 8
|
|
|
|
LUAI_FUNC int luaO_int2fb (unsigned int x);
|
|
LUAI_FUNC int luaO_fb2int (int x);
|
|
LUAI_FUNC int luaO_utf8esc (char *buff, unsigned long x);
|
|
LUAI_FUNC int luaO_ceillog2 (unsigned int x);
|
|
LUAI_FUNC void luaO_arith (lua_State *L, int op, const TValue *p1,
|
|
const TValue *p2, TValue *res);
|
|
LUAI_FUNC size_t luaO_str2num (const char *s, TValue *o);
|
|
LUAI_FUNC int luaO_hexavalue (int c);
|
|
LUAI_FUNC void luaO_tostring (lua_State *L, StkId obj);
|
|
LUAI_FUNC const char *luaO_pushvfstring (lua_State *L, const char *fmt,
|
|
va_list argp);
|
|
LUAI_FUNC const char *luaO_pushfstring (lua_State *L, const char *fmt, ...);
|
|
LUAI_FUNC void luaO_chunkid (char *out, const char *source, size_t len);
|
|
|
|
|
|
#endif
|
|
|