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#ifndef Py_SYMTABLE_H
#define Py_SYMTABLE_H
#ifdef __cplusplus
extern "C" {
#endif
/* A symbol table is constructed each time PyNode_Compile() is
called. The table walks the entire parse tree and identifies each
use or definition of a variable.
The symbol table contains a dictionary for each code block in a
module: The symbol dictionary for the block. They keys of these
dictionaries are the name of all variables used or defined in the
block; the integer values are used to store several flags,
e.g. DEF_PARAM indicates that a variable is a parameter to a
function.
*/
struct _symtable_entry;
struct symtable {
int st_pass; /* pass == 1 or 2 */
int st_nested_scopes; /* true if nested scopes are enabled */
char *st_filename; /* name of file being compiled */
struct _symtable_entry *st_cur; /* current symbol table entry */
PyObject *st_symbols; /* dictionary of symbol table entries */
PyObject *st_stack; /* stack of namespace info */
PyObject *st_global; /* borrowed ref to MODULE in st_symbols */
int st_nscopes; /* number of scopes */
int st_errors; /* number of errors */
char *st_private; /* name of current class or NULL */
int st_tmpname; /* temporary name counter */
PyFutureFeatures *st_future; /* module's future features */
};
typedef struct _symtable_entry {
PyObject_HEAD
PyObject *ste_id; /* int: key in st_symbols) */
PyObject *ste_symbols; /* dict: name to flags) */
PyObject *ste_name; /* string: name of scope */
PyObject *ste_varnames; /* list of variable names */
PyObject *ste_children; /* list of child ids */
int ste_type; /* module, class, or function */
int ste_lineno; /* first line of scope */
int ste_optimized; /* true if namespace can't be optimized */
int ste_nested; /* true if scope is nested */
int ste_child_free; /* true if a child scope has free variables,
including free refs to globals */
struct symtable *ste_table;
} PySymtableEntryObject;
extern DL_IMPORT(PyTypeObject) PySymtableEntry_Type;
#define PySymtableEntry_Check(op) ((op)->ob_type == &PySymtableEntry_Type)
extern DL_IMPORT(PyObject *) PySymtableEntry_New(struct symtable *,
char *, int, int);
DL_IMPORT(struct symtable *) PyNode_CompileSymtable(struct _node *, char *);
DL_IMPORT(void) PySymtable_Free(struct symtable *);
#define TOP "global"
/* Flags for def-use information */
#define DEF_GLOBAL 1 /* global stmt */
#define DEF_LOCAL 2 /* assignment in code block */
#define DEF_PARAM 2<<1 /* formal parameter */
#define USE 2<<2 /* name is used */
#define DEF_STAR 2<<3 /* parameter is star arg */
#define DEF_DOUBLESTAR 2<<4 /* parameter is star-star arg */
#define DEF_INTUPLE 2<<5 /* name defined in tuple in parameters */
#define DEF_FREE 2<<6 /* name used but not defined in nested scope */
#define DEF_FREE_GLOBAL 2<<7 /* free variable is actually implicit global */
#define DEF_FREE_CLASS 2<<8 /* free variable from class's method */
#define DEF_IMPORT 2<<9 /* assignment occurred via import */
#define DEF_BOUND (DEF_LOCAL | DEF_PARAM | DEF_IMPORT)
#define TYPE_FUNCTION 1
#define TYPE_CLASS 2
#define TYPE_MODULE 3
#define LOCAL 1
#define GLOBAL_EXPLICIT 2
#define GLOBAL_IMPLICIT 3
#define FREE 4
#define CELL 5
#define OPT_IMPORT_STAR 1
#define OPT_EXEC 2
#define OPT_BARE_EXEC 4
#ifdef __cplusplus
}
#endif
#endif /* !Py_SYMTABLE_H */
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