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122 lines
5 KiB
C
122 lines
5 KiB
C
#ifndef Py_LIMITED_API
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#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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/* XXX(ncoghlan): This is a weird mix of public names and interpreter internal
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* names.
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*/
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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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PyObject *st_filename; /* name of file being compiled,
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decoded from the filesystem encoding */
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struct _symtable_entry *st_cur; /* current symbol table entry */
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struct _symtable_entry *st_top; /* symbol table entry for module */
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PyObject *st_blocks; /* dict: map AST node addresses
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* to symbol table entries */
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PyObject *st_stack; /* list: stack of namespace info */
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PyObject *st_global; /* borrowed ref to st_top->ste_symbols */
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int st_nblocks; /* number of blocks used. kept for
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consistency with the corresponding
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compiler structure */
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PyObject *st_private; /* name of current class or NULL */
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PyFutureFeatures *st_future; /* module's future features that affect
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the symbol table */
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int recursion_depth; /* current recursion depth */
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int recursion_limit; /* recursion limit */
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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 ste_table->st_blocks */
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PyObject *ste_symbols; /* dict: variable names to flags */
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PyObject *ste_name; /* string: name of current block */
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PyObject *ste_varnames; /* list of function parameters */
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PyObject *ste_children; /* list of child blocks */
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PyObject *ste_directives;/* locations of global and nonlocal statements */
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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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unsigned ste_needs_class_closure : 1; /* for class scopes, true if a
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closure over __class__
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should be created */
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int ste_lineno; /* first line of block */
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int ste_col_offset; /* offset of first line of block */
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int ste_opt_lineno; /* lineno of last exec or import * */
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int ste_opt_col_offset; /* offset 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(
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mod_ty mod,
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const char *filename, /* decoded from the filesystem encoding */
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PyFutureFeatures *future);
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PyAPI_FUNC(struct symtable *) PySymtable_BuildObject(
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mod_ty mod,
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PyObject *filename,
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PyFutureFeatures *future);
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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 DEF_NONLOCAL 2<<2 /* nonlocal stmt */
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#define USE 2<<3 /* name is used */
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#define DEF_FREE 2<<4 /* name used but not defined in nested block */
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#define DEF_FREE_CLASS 2<<5 /* free variable from class's method */
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#define DEF_IMPORT 2<<6 /* 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 12-15.
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*/
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#define SCOPE_OFFSET 11
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#define SCOPE_MASK (DEF_GLOBAL | DEF_LOCAL | DEF_PARAM | DEF_NONLOCAL)
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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 two names are used for the ste_unoptimized bit field */
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#define OPT_IMPORT_STAR 1
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#define OPT_TOPLEVEL 2 /* 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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#endif /* Py_LIMITED_API */
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