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of nested functions. Either is allowed in a function if it contains no defs or lambdas or the defs and lambdas it contains have no free variables. If a function is itself nested and has free variables, either is illegal. Revise the symtable to use a PySymtableEntryObject, which holds all the revelent information for a scope, rather than using a bunch of st_cur_XXX pointers in the symtable struct. The changes simplify the internal management of the current symtable scope and of the stack. Added new C source file: Python/symtable.c. (Does the Windows build process need to be updated?) As part of these changes, the initial _symtable module interface introduced in 2.1a2 is replaced. A dictionary of PySymtableEntryObjects are returned.
91 lines
3.2 KiB
C
91 lines
3.2 KiB
C
#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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/* A symbol table is constructed each time PyNode_Compile() is
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called. The table walks the entire parse tree and identifies each
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use or definition of a variable.
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The symbol table contains a dictionary for each code block in a
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module: The symbol dictionary for the block. They keys of these
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dictionaries are the name of all variables used or defined in the
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block; the integer values are used to store several flags,
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e.g. DEF_PARAM indicates that a variable is a parameter to a
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function.
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*/
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struct _symtable_entry;
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struct symtable {
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int st_pass; /* pass == 1 or 2 */
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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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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_nscopes; /* number of scopes */
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int st_errors; /* number of errors */
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char *st_private; /* name of current class or NULL */
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int st_tmpname; /* temporary name counter */
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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 scope */
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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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int ste_type; /* module, class, or function */
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int ste_lineno; /* first line of scope */
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int ste_optimized; /* true if namespace is optimized */
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int ste_nested; /* true if scope is nested */
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int ste_child_free; /* true if a child scope has free variables,
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including free refs to globals */
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struct symtable *ste_table;
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} PySymtableEntryObject;
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extern DL_IMPORT(PyTypeObject) PySymtableEntry_Type;
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#define PySymtableEntry_Check(op) ((op)->ob_type == &PySymtableEntry_Type)
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extern DL_IMPORT(PyObject *) PySymtableEntry_New(struct symtable *,
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char *, int, int);
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DL_IMPORT(struct symtable *) PyNode_CompileSymtable(struct _node *, char *);
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DL_IMPORT(void) PySymtable_Free(struct symtable *);
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#define TOP "global"
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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_STAR 2<<3 /* parameter is star arg */
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#define DEF_DOUBLESTAR 2<<4 /* parameter is star-star arg */
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#define DEF_INTUPLE 2<<5 /* name defined in tuple in parameters */
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#define DEF_FREE 2<<6 /* name used by not defined in nested scope */
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#define DEF_FREE_GLOBAL 2<<7 /* free variable is actually implicit global */
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#define DEF_FREE_CLASS 2<<8 /* free variable from class's method */
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#define DEF_IMPORT 2<<9 /* assignment occurred via import */
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#define TYPE_FUNCTION 1
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#define TYPE_CLASS 2
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#define TYPE_MODULE 3
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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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#ifdef __cplusplus
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}
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#endif
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#endif /* !Py_SYMTABLE_H */
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