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#ifndef Py_SYMTABLE_H

#define Py_SYMTABLE_H

#ifdef __cplusplus

extern "C" {

#endif

typedef enum _block_type { FunctionBlock, ClassBlock, ModuleBlock }

_Py_block_ty;

struct _symtable_entry;

struct symtable {

const char *st_filename; /* name of file being compiled */

struct _symtable_entry *st_cur; /* current symbol table entry */

struct _symtable_entry *st_top; /* module 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_nblocks; /* number of blocks */

PyObject *st_private; /* name of current class or NULL */

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 block */

PyObject *ste_varnames; /* list of variable names */

PyObject *ste_children; /* list of child ids */

_Py_block_ty ste_type; /* module, class, or function */

int ste_unoptimized; /* false if namespace is optimized */

int ste_nested; /* true if block is nested */

unsigned ste_free : 1; /* true if block has free variables */

unsigned ste_child_free : 1; /* true if a child block has free vars,

including free refs to globals */

unsigned ste_generator : 1; /* true if namespace is a generator */

unsigned ste_varargs : 1; /* true if block has varargs */

unsigned ste_varkeywords : 1; /* true if block has varkeywords */

unsigned ste_returns_value : 1; /* true if namespace uses return with

an argument */

int ste_lineno; /* first line of block */

int ste_opt_lineno; /* lineno of last exec or import * */

int ste_tmpname; /* counter for listcomp temp vars */

struct symtable *ste_table;

} PySTEntryObject;

PyAPI_DATA(PyTypeObject) PySTEntry_Type;

#define PySTEntry_Check(op) (Py_TYPE(op) == &PySTEntry_Type)

PyAPI_FUNC(int) PyST_GetScope(PySTEntryObject *, PyObject *);

PyAPI_FUNC(struct symtable *) PySymtable_Build(mod_ty, const char *,

PyFutureFeatures *);

PyAPI_FUNC(PySTEntryObject *) PySymtable_Lookup(struct symtable *, void *);

PyAPI_FUNC(void) PySymtable_Free(struct symtable *);

/* 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_FREE 2<<3 /* name used but not defined in nested block */

#define DEF_FREE_CLASS 2<<4 /* free variable from class's method */

#define DEF_IMPORT 2<<5 /* assignment occurred via import */

#define DEF_BOUND (DEF_LOCAL | DEF_PARAM | DEF_IMPORT)

/* GLOBAL_EXPLICIT and GLOBAL_IMPLICIT are used internally by the symbol

table. GLOBAL is returned from PyST_GetScope() for either of them.

It is stored in ste_symbols at bits 12-14.

#define SCOPE_OFF 11

#define SCOPE_MASK 7

#define LOCAL 1

#define GLOBAL_EXPLICIT 2

#define GLOBAL_IMPLICIT 3

#define FREE 4

#define CELL 5

/* The following three names are used for the ste_unoptimized bit field */

#define OPT_IMPORT_STAR 1

#define OPT_EXEC 2

#define OPT_BARE_EXEC 4

#define OPT_TOPLEVEL 8 /* top-level names, including eval and exec */

#define GENERATOR 1

#define GENERATOR_EXPRESSION 2

#ifdef __cplusplus

}

#endif

#endif /* !Py_SYMTABLE_H */

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