symtable.h

#ifndefPy_SYMTABLE_H
#definePy_SYMTABLE_H

#ifdef__cplusplus
extern"C" {
#endif

typedefenum_block_type { FunctionBlock, ClassBlock, ModuleBlock }
_Py_block_ty;

struct_symtable_entry;

structsymtable {
constchar*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 */
intst_nblocks; /* number of blocks */
PyObject*st_private; /* name of current class or NULL */
PyFutureFeatures*st_future; /* module's future features */
};

typedefstruct_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_tyste_type; /* module, class, or function */
intste_unoptimized; /* false if namespace is optimized */
intste_nested; /* true if block is nested */
unsignedste_free : 1; /* true if block has free variables */
unsignedste_child_free : 1; /* true if a child block has free vars,
 including free refs to globals */
unsignedste_generator : 1; /* true if namespace is a generator */
unsignedste_varargs : 1; /* true if block has varargs */
unsignedste_varkeywords : 1; /* true if block has varkeywords */
unsignedste_returns_value : 1; /* true if namespace uses return with
 an argument */
intste_lineno; /* first line of block */
intste_opt_lineno; /* lineno of last exec or import * */
intste_tmpname; /* counter for listcomp temp vars */
structsymtable*ste_table;
} PySTEntryObject;

PyAPI_DATA(PyTypeObject) PySTEntry_Type;

#definePySTEntry_Check(op) (Py_TYPE(op) == &PySTEntry_Type)

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

PyAPI_FUNC(structsymtable*) PySymtable_Build(mod_ty, constchar*,
PyFutureFeatures*);
PyAPI_FUNC(PySTEntryObject*) PySymtable_Lookup(structsymtable*, void*);

PyAPI_FUNC(void) PySymtable_Free(structsymtable*);

/* Flags for def-use information */

#defineDEF_GLOBAL 1 /* global stmt */
#defineDEF_LOCAL 2 /* assignment in code block */
#defineDEF_PARAM 2<<1 /* formal parameter */
#defineUSE 2<<2 /* name is used */
#defineDEF_FREE 2<<3 /* name used but not defined in nested block */
#defineDEF_FREE_CLASS 2<<4 /* free variable from class's method */
#defineDEF_IMPORT 2<<5 /* assignment occurred via import */

#defineDEF_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.
*/
#defineSCOPE_OFF 11
#defineSCOPE_MASK 7

#defineLOCAL 1
#defineGLOBAL_EXPLICIT 2
#defineGLOBAL_IMPLICIT 3
#defineFREE 4
#defineCELL 5

/* The following three names are used for the ste_unoptimized bit field */
#defineOPT_IMPORT_STAR 1
#defineOPT_EXEC 2
#defineOPT_BARE_EXEC 4
#defineOPT_TOPLEVEL 8 /* top-level names, including eval and exec */

#defineGENERATOR 1
#defineGENERATOR_EXPRESSION 2

#ifdef__cplusplus
}
#endif
#endif/* !Py_SYMTABLE_H */