1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
|
#ifndef Py_LIMITED_API
#ifndef Py_SYMTABLE_H
#define Py_SYMTABLE_H
#ifdef __cplusplus
extern "C" {
#endif
#include "Python-ast.h" /* mod_ty */
/* XXX(ncoghlan): This is a weird mix of public names and interpreter internal
* names.
*/
typedef enum _block_type { FunctionBlock, ClassBlock, ModuleBlock }
_Py_block_ty;
struct _symtable_entry;
struct symtable {
PyObject *st_filename; /* name of file being compiled,
decoded from the filesystem encoding */
struct _symtable_entry *st_cur; /* current symbol table entry */
struct _symtable_entry *st_top; /* symbol table entry for module */
PyObject *st_blocks; /* dict: map AST node addresses
* to symbol table entries */
PyObject *st_stack; /* list: stack of namespace info */
PyObject *st_global; /* borrowed ref to st_top->ste_symbols */
int st_nblocks; /* number of blocks used. kept for
consistency with the corresponding
compiler structure */
PyObject *st_private; /* name of current class or NULL */
PyFutureFeatures *st_future; /* module's future features that affect
the symbol table */
int recursion_depth; /* current recursion depth */
int recursion_limit; /* recursion limit */
};
typedef struct _symtable_entry {
PyObject_HEAD
PyObject *ste_id; /* int: key in ste_table->st_blocks */
PyObject *ste_symbols; /* dict: variable names to flags */
PyObject *ste_name; /* string: name of current block */
PyObject *ste_varnames; /* list of function parameters */
PyObject *ste_children; /* list of child blocks */
PyObject *ste_directives;/* locations of global and nonlocal statements */
_Py_block_ty ste_type; /* module, class, or function */
int ste_nested; /* true if block is nested */
unsigned ste_free : 1; /* true if block has free variables */
unsigned ste_child_free : 1; /* true if a child block has free vars,
including free refs to globals */
unsigned ste_generator : 1; /* true if namespace is a generator */
unsigned ste_coroutine : 1; /* true if namespace is a coroutine */
unsigned ste_comprehension : 1; /* true if namespace is a list comprehension */
unsigned ste_varargs : 1; /* true if block has varargs */
unsigned ste_varkeywords : 1; /* true if block has varkeywords */
unsigned ste_returns_value : 1; /* true if namespace uses return with
an argument */
unsigned ste_needs_class_closure : 1; /* for class scopes, true if a
closure over __class__
should be created */
unsigned ste_comp_iter_target : 1; /* true if visiting comprehension target */
int ste_comp_iter_expr; /* non-zero if visiting a comprehension range expression */
int ste_lineno; /* first line of block */
int ste_col_offset; /* offset of first line of block */
int ste_opt_lineno; /* lineno of last exec or import * */
int ste_opt_col_offset; /* offset of last exec or import * */
struct symtable *ste_table;
} PySTEntryObject;
PyAPI_DATA(PyTypeObject) PySTEntry_Type;
#define PySTEntry_Check(op) Py_IS_TYPE(op, &PySTEntry_Type)
PyAPI_FUNC(int) PyST_GetScope(PySTEntryObject *, PyObject *);
PyAPI_FUNC(struct symtable *) PySymtable_Build(
mod_ty mod,
const char *filename, /* decoded from the filesystem encoding */
PyFutureFeatures *future);
PyAPI_FUNC(struct symtable *) PySymtable_BuildObject(
mod_ty mod,
PyObject *filename,
PyFutureFeatures *future);
PyAPI_FUNC(PySTEntryObject *) PySymtable_Lookup(struct symtable *, void *);
PyAPI_FUNC(void) PySymtable_Free(struct symtable *);
/* 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 DEF_NONLOCAL 2<<2 /* nonlocal stmt */
#define USE 2<<3 /* name is used */
#define DEF_FREE 2<<4 /* name used but not defined in nested block */
#define DEF_FREE_CLASS 2<<5 /* free variable from class's method */
#define DEF_IMPORT 2<<6 /* assignment occurred via import */
#define DEF_ANNOT 2<<7 /* this name is annotated */
#define DEF_COMP_ITER 2<<8 /* this name is a comprehension iteration variable */
#define DEF_BOUND (DEF_LOCAL | DEF_PARAM | DEF_IMPORT)
/* GLOBAL_EXPLICIT and GLOBAL_IMPLICIT are used internally by the symbol
table. GLOBAL is returned from PyST_GetScope() for either of them.
It is stored in ste_symbols at bits 12-15.
*/
#define SCOPE_OFFSET 11
#define SCOPE_MASK (DEF_GLOBAL | DEF_LOCAL | DEF_PARAM | DEF_NONLOCAL)
#define LOCAL 1
#define GLOBAL_EXPLICIT 2
#define GLOBAL_IMPLICIT 3
#define FREE 4
#define CELL 5
#define GENERATOR 1
#define GENERATOR_EXPRESSION 2
#ifdef __cplusplus
}
#endif
#endif /* !Py_SYMTABLE_H */
#endif /* !Py_LIMITED_API */
|
