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#ifndef Py_SYMTABLE_H
#define Py_SYMTABLE_H
#ifdef __cplusplus
extern "C" {
#endif
/* XXX(ncoghlan): This is a weird mix of public names and interpreter internal
* names.
*/
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; /* symbol table entry for module */
PyObject *st_blocks; /* dict: map AST node addresses
* to symbol table entries */
PyObject *st_stack; /* list: stack of namespace info */
PyObject *st_global; /* borrowed ref to st_top->st_symbols */
int st_nblocks; /* number of blocks used */
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 ste_table->st_blocks */
PyObject *ste_symbols; /* dict: variable names to flags */
PyObject *ste_name; /* string: name of current block */
PyObject *ste_varnames; /* list of variable names */
PyObject *ste_children; /* list of child blocks */
_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 DEF_NONLOCAL 2<<2 /* nonlocal stmt */
#define USE 2<<3 /* name is used */
#define DEF_STAR 2<<4 /* parameter is star arg */
#define DEF_DOUBLESTAR 2<<5 /* parameter is star-star arg */
#define DEF_INTUPLE 2<<6 /* name defined in tuple in parameters */
#define DEF_FREE 2<<7 /* name used but not defined in nested block */
#define DEF_FREE_GLOBAL 2<<8 /* free variable is actually implicit global */
#define DEF_FREE_CLASS 2<<9 /* free variable from class's method */
#define DEF_IMPORT 2<<10 /* 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 12-15.
*/
#define SCOPE_OFFSET 11
#define SCOPE_MASK (DEF_GLOBAL | DEF_LOCAL | DEF_PARAM | DEF_NONLOCAL)
#define LOCAL 1
#define GLOBAL_EXPLICIT 2
#define GLOBAL_IMPLICIT 3
#define FREE 4
#define CELL 5
/* The following two names are used for the ste_unoptimized bit field */
#define OPT_IMPORT_STAR 1
#define OPT_TOPLEVEL 2 /* 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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