Type definitions for Lua objects

1 files changed, 171 insertions, 0 deletions

diff --git a/lobject.h b/lobject.h
new file mode 100644
index 00000000..710d4a6a
--- /dev/null
+++ b/lobject.h
@@ -0,0 +1,171 @@
+/*
+** $Id: $
+** Type definitions for Lua objects
+** See Copyright Notice in lua.h
+*/
+
+#ifndef lobject_h
+#define lobject_h
+
+
+#include "lua.h"
+
+
+#include <limits.h>
+
+#ifndef real
+#define real float
+#endif
+
+#define Byte lua_Byte   /* some systems have Byte as a predefined type */
+typedef unsigned char  Byte;  /* unsigned 8 bits */
+
+#define Word lua_Word   /* some systems have Word as a predefined type */
+typedef unsigned short Word;  /* unsigned 16 bits */
+
+#define MAX_WORD  (USHRT_MAX-2)  /* maximum value of a word (-2 for safety) */
+#define MAX_INT   (INT_MAX-2)  /* maximum value of a int (-2 for safety) */
+
+typedef unsigned int IntPoint; /* unsigned with same size as a pointer (for hashing) */
+
+
+
+
+/*
+** String headers for string table
+*/
+
+#define NOT_USED  0xFFFE
+
+typedef struct TaggedString {
+  int tag;  /* if != LUA_T_STRING, this is a userdata */
+  union {
+    unsigned long hash;
+    struct TaggedString *next;
+  } uu;
+  union {
+    struct {
+      Word varindex;  /* != NOT_USED  if this is a symbol */
+      Word constindex;  /* hint to reuse constant indexes */
+    } s;
+    void *v;  /* if this is a userdata, here is its value */
+  } u;
+  int marked;   /* for garbage collection; never collect (nor change) if > 1 */
+  char str[1];   /* \0 byte already reserved */
+} TaggedString;
+
+
+
+/*
+** generic header for garbage collector lists
+*/
+typedef struct GCnode {
+  struct GCnode *next;
+  int marked;
+} GCnode;
+
+
+/*
+** Function Prototypes
+*/
+typedef struct TProtoFunc {
+  GCnode head;
+  Byte *code;  /* ends with opcode ENDCODE */
+  int lineDefined;
+  TaggedString  *fileName;
+  struct TObject *consts;
+  int nconsts;
+  struct LocVar *locvars;  /* ends with line = -1 */
+  int nupvalues;
+} TProtoFunc;
+
+typedef struct LocVar {
+  TaggedString *varname;           /* NULL signals end of scope */
+  int line;
+} LocVar;
+
+
+
+
+/*
+** Lua TYPES
+** WARNING: if you change the order of this enumeration,
+** grep "ORDER LUA_T"
+*/
+typedef enum {
+  LUA_T_NIL      = -10,
+  LUA_T_NUMBER   = -9,
+  LUA_T_STRING   = -8,
+  LUA_T_ARRAY    = -7,  /* array==table */
+  LUA_T_PROTO    = -6,
+  LUA_T_FUNCTION = -5,
+  LUA_T_CFUNCTION= -4,
+  LUA_T_MARK     = -3,
+  LUA_T_CMARK    = -2,
+  LUA_T_LINE     = -1,
+  LUA_T_USERDATA = 0
+} lua_Type;
+
+#define NUM_TYPES 11
+
+
+typedef union {
+  lua_CFunction f;
+  real n;
+  TaggedString *ts;
+  TProtoFunc *tf;
+  struct Closure *cl;
+  struct Hash *a;
+  int i;
+} Value;
+
+typedef struct TObject {
+  lua_Type ttype;
+  Value value;
+} TObject;
+
+
+/* Macros to access structure members */
+#define ttype(o)        ((o)->ttype)
+#define nvalue(o)       ((o)->value.n)
+#define svalue(o)       ((o)->value.ts->str)
+#define tsvalue(o)      ((o)->value.ts)
+#define clvalue(o)      ((o)->value.cl)
+#define avalue(o)       ((o)->value.a)
+#define fvalue(o)       ((o)->value.f)
+#define tfvalue(o)      ((o)->value.tf)
+
+
+/*
+** Closures
+*/
+typedef struct Closure {
+  GCnode head;
+  TObject consts[1];  /* at least one for prototype */
+} Closure;
+
+
+
+typedef struct node {
+  TObject ref;
+  TObject val;
+} Node;
+
+typedef struct Hash {
+  GCnode head;
+  Node *node;
+  int nhash;
+  int nuse;
+  int htag;
+} Hash;
+
+
+extern long luaO_nentities;
+extern char *luaO_typenames[];
+
+int luaO_equalObj (TObject *t1, TObject *t2);
+int luaO_redimension (int oldsize);
+int luaO_findstring (char *name, char *list[]);
+
+
+#endif