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/Include/symtable.h

http://unladen-swallow.googlecode.com/
C++ Header | 104 lines | 78 code | 18 blank | 8 comment | 1 complexity | 831ea054d30f89ae8f12e82a2d07ca62 MD5 | raw file
  1#ifndef Py_SYMTABLE_H
  2#define Py_SYMTABLE_H
  3
  4#ifdef __cplusplus
  5extern "C" {
  6#endif
  7
  8typedef enum _block_type { FunctionBlock, ClassBlock, ModuleBlock }
  9    _Py_block_ty;
 10
 11struct _symtable_entry;
 12
 13struct symtable {
 14	const char *st_filename; /* name of file being compiled */
 15	struct _symtable_entry *st_cur; /* current symbol table entry */
 16	struct _symtable_entry *st_top; /* module entry */
 17	PyObject *st_symbols;    /* dictionary of symbol table entries */
 18        PyObject *st_stack;      /* stack of namespace info */
 19	PyObject *st_global;     /* borrowed ref to MODULE in st_symbols */
 20	int st_nblocks;          /* number of blocks */
 21	PyObject *st_private;        /* name of current class or NULL */
 22        int st_tmpname;          /* temporary name counter */
 23	PyFutureFeatures *st_future; /* module's future features */
 24};
 25
 26typedef struct _symtable_entry {
 27	PyObject_HEAD
 28	PyObject *ste_id;        /* int: key in st_symbols */
 29	PyObject *ste_symbols;   /* dict: name to flags */
 30	PyObject *ste_name;      /* string: name of block */
 31	PyObject *ste_varnames;  /* list of variable names */
 32	PyObject *ste_children;  /* list of child ids */
 33	_Py_block_ty ste_type;   /* module, class, or function */
 34	int ste_unoptimized;     /* false if namespace is optimized */
 35	int ste_nested;      /* true if block is nested */
 36	unsigned ste_free : 1;        /* true if block has free variables */
 37	unsigned ste_child_free : 1;  /* true if a child block has free vars,
 38				         including free refs to globals */
 39	unsigned ste_generator : 1;   /* true if namespace is a generator */
 40	unsigned ste_blockstack : 1;   /* true if the blockstack is required */
 41	unsigned ste_varargs : 1;     /* true if block has varargs */
 42	unsigned ste_varkeywords : 1; /* true if block has varkeywords */
 43	unsigned ste_returns_value : 1;  /* true if namespace uses return with
 44	                                    an argument */
 45	int ste_lineno;          /* first line of block */
 46	int ste_opt_lineno;      /* lineno of last exec or import * */
 47	int ste_tmpname;         /* counter for listcomp temp vars */
 48	struct symtable *ste_table;
 49} PySTEntryObject;
 50
 51PyAPI_DATA(PyTypeObject) PySTEntry_Type;
 52
 53#define PySTEntry_Check(op) (Py_TYPE(op) == &PySTEntry_Type)
 54
 55PyAPI_FUNC(int) PyST_GetScope(PySTEntryObject *, PyObject *);
 56
 57PyAPI_FUNC(struct symtable *) PySymtable_Build(mod_ty, const char *,
 58					      PyFutureFeatures *);
 59PyAPI_FUNC(PySTEntryObject *) PySymtable_Lookup(struct symtable *, void *);
 60
 61PyAPI_FUNC(void) PySymtable_Free(struct symtable *);
 62
 63/* Flags for def-use information */
 64
 65#define DEF_GLOBAL 1           /* global stmt */
 66#define DEF_LOCAL 2            /* assignment in code block */
 67#define DEF_PARAM 2<<1         /* formal parameter */
 68#define USE 2<<2               /* name is used */
 69#define DEF_STAR 2<<3          /* parameter is star arg */
 70#define DEF_DOUBLESTAR 2<<4    /* parameter is star-star arg */
 71#define DEF_INTUPLE 2<<5       /* name defined in tuple in parameters */
 72#define DEF_FREE 2<<6          /* name used but not defined in nested block */
 73#define DEF_FREE_GLOBAL 2<<7   /* free variable is actually implicit global */
 74#define DEF_FREE_CLASS 2<<8    /* free variable from class's method */
 75#define DEF_IMPORT 2<<9        /* assignment occurred via import */
 76
 77#define DEF_BOUND (DEF_LOCAL | DEF_PARAM | DEF_IMPORT)
 78
 79/* GLOBAL_EXPLICIT and GLOBAL_IMPLICIT are used internally by the symbol
 80   table.  GLOBAL is returned from PyST_GetScope() for either of them. 
 81   It is stored in ste_symbols at bits 12-14.
 82*/
 83#define SCOPE_OFF 11
 84#define SCOPE_MASK 7
 85
 86#define LOCAL 1
 87#define GLOBAL_EXPLICIT 2
 88#define GLOBAL_IMPLICIT 3
 89#define FREE 4
 90#define CELL 5
 91
 92/* The following three names are used for the ste_unoptimized bit field */
 93#define OPT_IMPORT_STAR 1
 94#define OPT_EXEC 2
 95#define OPT_BARE_EXEC 4
 96#define OPT_TOPLEVEL 8  /* top-level names, including eval and exec */
 97
 98#define GENERATOR 1
 99#define GENERATOR_EXPRESSION 2
100
101#ifdef __cplusplus
102}
103#endif
104#endif /* !Py_SYMTABLE_H */