#ifndef Py_SYMTABLE_H

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#define Py_SYMTABLE_H

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#ifdef __cplusplus

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extern "C" {

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#endif

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typedef enum _block_type { FunctionBlock, ClassBlock, ModuleBlock }

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_Py_block_ty;

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struct _symtable_entry;

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struct symtable {

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

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

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struct _symtable_entry *st_top; /* module entry */

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PyObject *st_symbols; /* dictionary of symbol table entries */

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PyObject *st_stack; /* stack of namespace info */

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PyObject *st_global; /* borrowed ref to MODULE in st_symbols */

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int st_nblocks; /* number of blocks */

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

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PyFutureFeatures *st_future; /* module's future features */

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};

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typedef struct _symtable_entry {

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PyObject_HEAD

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PyObject *ste_id; /* int: key in st_symbols */

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PyObject *ste_symbols; /* dict: name to flags */

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PyObject *ste_name; /* string: name of block */

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

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

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

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

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

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

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

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including free refs to globals */

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

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

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

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

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an argument */

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int ste_lineno; /* first line of block */

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

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

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struct symtable *ste_table;

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} PySTEntryObject;

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PyAPI_DATA(PyTypeObject) PySTEntry_Type;

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

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

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

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PyFutureFeatures *);

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

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PyAPI_FUNC(void) PySymtable_Free(struct symtable *);

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/* Flags for def-use information */

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#define DEF_GLOBAL 1 /* global stmt */

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#define DEF_LOCAL 2 /* assignment in code block */

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#define DEF_PARAM 2<<1 /* formal parameter */

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#define USE 2<<2 /* name is used */

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#define DEF_FREE 2<<3 /* name used but not defined in nested block */

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

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

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#define DEF_BOUND (DEF_LOCAL | DEF_PARAM | DEF_IMPORT)

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/* GLOBAL_EXPLICIT and GLOBAL_IMPLICIT are used internally by the symbol

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

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It is stored in ste_symbols at bits 12-14.

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*/

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#define SCOPE_OFF 11

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#define SCOPE_MASK 7

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#define LOCAL 1

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#define GLOBAL_EXPLICIT 2

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#define GLOBAL_IMPLICIT 3

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#define FREE 4

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#define CELL 5

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

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#define OPT_IMPORT_STAR 1

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#define OPT_EXEC 2

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#define OPT_BARE_EXEC 4

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

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#define GENERATOR 1

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#define GENERATOR_EXPRESSION 2

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#ifdef __cplusplus

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}

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#endif

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#endif /* !Py_SYMTABLE_H */

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