1#ifndef Py_CPYTHON_CODE_H
2# error "this header file must not be included directly"
3#endif
4
5typedef uint16_t _Py_CODEUNIT;
6
7#ifdef WORDS_BIGENDIAN
8# define _Py_OPCODE(word) ((word) >> 8)
9# define _Py_OPARG(word) ((word) & 255)
10#else
11# define _Py_OPCODE(word) ((word) & 255)
12# define _Py_OPARG(word) ((word) >> 8)
13#endif
14
15typedef struct _PyOpcache _PyOpcache;
16
17/* Bytecode object */
18struct PyCodeObject {
19 PyObject_HEAD
20 int co_argcount; /* #arguments, except *args */
21 int co_posonlyargcount; /* #positional only arguments */
22 int co_kwonlyargcount; /* #keyword only arguments */
23 int co_nlocals; /* #local variables */
24 int co_stacksize; /* #entries needed for evaluation stack */
25 int co_flags; /* CO_..., see below */
26 int co_firstlineno; /* first source line number */
27 PyObject *co_code; /* instruction opcodes */
28 PyObject *co_consts; /* list (constants used) */
29 PyObject *co_names; /* list of strings (names used) */
30 PyObject *co_varnames; /* tuple of strings (local variable names) */
31 PyObject *co_freevars; /* tuple of strings (free variable names) */
32 PyObject *co_cellvars; /* tuple of strings (cell variable names) */
33 /* The rest aren't used in either hash or comparisons, except for co_name,
34 used in both. This is done to preserve the name and line number
35 for tracebacks and debuggers; otherwise, constant de-duplication
36 would collapse identical functions/lambdas defined on different lines.
37 */
38 Py_ssize_t *co_cell2arg; /* Maps cell vars which are arguments. */
39 PyObject *co_filename; /* unicode (where it was loaded from) */
40 PyObject *co_name; /* unicode (name, for reference) */
41 PyObject *co_linetable; /* string (encoding addr<->lineno mapping) See
42 Objects/lnotab_notes.txt for details. */
43 void *co_zombieframe; /* for optimization only (see frameobject.c) */
44 PyObject *co_weakreflist; /* to support weakrefs to code objects */
45 /* Scratch space for extra data relating to the code object.
46 Type is a void* to keep the format private in codeobject.c to force
47 people to go through the proper APIs. */
48 void *co_extra;
49
50 /* Per opcodes just-in-time cache
51 *
52 * To reduce cache size, we use indirect mapping from opcode index to
53 * cache object:
54 * cache = co_opcache[co_opcache_map[next_instr - first_instr] - 1]
55 */
56
57 // co_opcache_map is indexed by (next_instr - first_instr).
58 // * 0 means there is no cache for this opcode.
59 // * n > 0 means there is cache in co_opcache[n-1].
60 unsigned char *co_opcache_map;
61 _PyOpcache *co_opcache;
62 int co_opcache_flag; // used to determine when create a cache.
63 unsigned char co_opcache_size; // length of co_opcache.
64};
65
66/* Masks for co_flags above */
67#define CO_OPTIMIZED 0x0001
68#define CO_NEWLOCALS 0x0002
69#define CO_VARARGS 0x0004
70#define CO_VARKEYWORDS 0x0008
71#define CO_NESTED 0x0010
72#define CO_GENERATOR 0x0020
73/* The CO_NOFREE flag is set if there are no free or cell variables.
74 This information is redundant, but it allows a single flag test
75 to determine whether there is any extra work to be done when the
76 call frame it setup.
77*/
78#define CO_NOFREE 0x0040
79
80/* The CO_COROUTINE flag is set for coroutine functions (defined with
81 ``async def`` keywords) */
82#define CO_COROUTINE 0x0080
83#define CO_ITERABLE_COROUTINE 0x0100
84#define CO_ASYNC_GENERATOR 0x0200
85
86/* bpo-39562: These constant values are changed in Python 3.9
87 to prevent collision with compiler flags. CO_FUTURE_ and PyCF_
88 constants must be kept unique. PyCF_ constants can use bits from
89 0x0100 to 0x10000. CO_FUTURE_ constants use bits starting at 0x20000. */
90#define CO_FUTURE_DIVISION 0x20000
91#define CO_FUTURE_ABSOLUTE_IMPORT 0x40000 /* do absolute imports by default */
92#define CO_FUTURE_WITH_STATEMENT 0x80000
93#define CO_FUTURE_PRINT_FUNCTION 0x100000
94#define CO_FUTURE_UNICODE_LITERALS 0x200000
95
96#define CO_FUTURE_BARRY_AS_BDFL 0x400000
97#define CO_FUTURE_GENERATOR_STOP 0x800000
98#define CO_FUTURE_ANNOTATIONS 0x1000000
99
100/* This value is found in the co_cell2arg array when the associated cell
101 variable does not correspond to an argument. */
102#define CO_CELL_NOT_AN_ARG (-1)
103
104/* This should be defined if a future statement modifies the syntax.
105 For example, when a keyword is added.
106*/
107#define PY_PARSER_REQUIRES_FUTURE_KEYWORD
108
109#define CO_MAXBLOCKS 20 /* Max static block nesting within a function */
110
111PyAPI_DATA(PyTypeObject) PyCode_Type;
112
113#define PyCode_Check(op) Py_IS_TYPE(op, &PyCode_Type)
114#define PyCode_GetNumFree(op) (PyTuple_GET_SIZE((op)->co_freevars))
115
116/* Public interface */
117PyAPI_FUNC(PyCodeObject *) PyCode_New(
118 int, int, int, int, int, PyObject *, PyObject *,
119 PyObject *, PyObject *, PyObject *, PyObject *,
120 PyObject *, PyObject *, int, PyObject *);
121
122PyAPI_FUNC(PyCodeObject *) PyCode_NewWithPosOnlyArgs(
123 int, int, int, int, int, int, PyObject *, PyObject *,
124 PyObject *, PyObject *, PyObject *, PyObject *,
125 PyObject *, PyObject *, int, PyObject *);
126 /* same as struct above */
127
128/* Creates a new empty code object with the specified source location. */
129PyAPI_FUNC(PyCodeObject *)
130PyCode_NewEmpty(const char *filename, const char *funcname, int firstlineno);
131
132/* Return the line number associated with the specified bytecode index
133 in this code object. If you just need the line number of a frame,
134 use PyFrame_GetLineNumber() instead. */
135PyAPI_FUNC(int) PyCode_Addr2Line(PyCodeObject *, int);
136
137/* for internal use only */
138struct _opaque {
139 int computed_line;
140 const char *lo_next;
141 const char *limit;
142};
143
144typedef struct _line_offsets {
145 int ar_start;
146 int ar_end;
147 int ar_line;
148 struct _opaque opaque;
149} PyCodeAddressRange;
150
151/* Update *bounds to describe the first and one-past-the-last instructions in the
152 same line as lasti. Return the number of that line.
153*/
154PyAPI_FUNC(int) _PyCode_CheckLineNumber(int lasti, PyCodeAddressRange *bounds);
155
156/* Create a comparable key used to compare constants taking in account the
157 * object type. It is used to make sure types are not coerced (e.g., float and
158 * complex) _and_ to distinguish 0.0 from -0.0 e.g. on IEEE platforms
159 *
160 * Return (type(obj), obj, ...): a tuple with variable size (at least 2 items)
161 * depending on the type and the value. The type is the first item to not
162 * compare bytes and str which can raise a BytesWarning exception. */
163PyAPI_FUNC(PyObject*) _PyCode_ConstantKey(PyObject *obj);
164
165PyAPI_FUNC(PyObject*) PyCode_Optimize(PyObject *code, PyObject* consts,
166 PyObject *names, PyObject *lnotab);
167
168
169PyAPI_FUNC(int) _PyCode_GetExtra(PyObject *code, Py_ssize_t index,
170 void **extra);
171PyAPI_FUNC(int) _PyCode_SetExtra(PyObject *code, Py_ssize_t index,
172 void *extra);
173
174/** API for initializing the line number table. */
175int _PyCode_InitAddressRange(PyCodeObject* co, PyCodeAddressRange *bounds);
176
177/** Out of process API for initializing the line number table. */
178void PyLineTable_InitAddressRange(const char *linetable, Py_ssize_t length, int firstlineno, PyCodeAddressRange *range);
179
180/** API for traversing the line number table. */
181int PyLineTable_NextAddressRange(PyCodeAddressRange *range);
182int PyLineTable_PreviousAddressRange(PyCodeAddressRange *range);
183
184
185

source code of include/python3.10/cpython/code.h