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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.
The slots st_cur_XXX pointers always refer to the current code
block. The st_cur slot is the symbol dictionary. The st_cur_id
slot is the id is the key in st_symbols. The st_cur_name slot is
the name of the current scope. The st_cur_type slot is one of
TYPE_FUNCTION, TYPE_CLASS, or TYPE_MODULE. The st_cur_children is
a list of the ids of the current node's children.
The st_symbols slot is a dictionary that maps code block ids to
symbol dictionaries. The keys are generated by a counter that is
incremented each time a new code block is found. The counter is
identifies a specific scope, because both passes walk the parse
tree in the same order.
The st_varnames slot is a dictionary that maps code block ids to
parameter lists. The st_global slot always refers to the symbol
dictionary for the module.
The st_children slot is a dictionary that maps ids to a list
containing the ids of its children.
If st_keep is true then the namespace info pushed on st_stack will
also be stored in st_scopes. This is useful if the symbol table is
being passed to something other than the compiler.
*/
struct symtable {
int st_pass; /* pass == 1 or 2 */
int st_keep; /* true if symtable will be returned */
PyObject *st_symbols; /* dictionary of symbol tables */
PyObject *st_varnames; /* dictionary of parameter lists */
PyObject *st_stack; /* stack of namespace info */
PyObject *st_scopes; /* dictionary of namespace info */
PyObject *st_children; /* dictionary (id=[ids]) */
PyObject *st_cur; /* borrowed ref to dict in st_symbols */
PyObject *st_cur_name; /* string, name of current scope */
PyObject *st_cur_id; /* int id of current code block */
PyObject *st_cur_children; /* ref to current children list */
int st_cur_type; /* type of current scope */
int st_cur_lineno; /* line number where current scope begins */
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 */
int st_nested; /* bool (true if nested scope) */
};
DL_IMPORT(struct symtable *) PyNode_CompileSymtable(struct _node *, char *);
DL_IMPORT(void) PySymtable_Free(struct symtable *);
#define TOP "global"
#define NOOPT ".noopt"
/* 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 by 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 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
#ifdef __cplusplus
}
#endif
#endif /* !Py_SYMTABLE_H */
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