cpython/Include/code.h at 3.8 · python/cpython · GitHub

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/* Definitions for bytecode */

#ifndef Py_LIMITED_API

#ifndef Py_CODE_H

#define Py_CODE_H

#ifdef __cplusplus

extern "C" {

#endif

typedef uint16_t _Py_CODEUNIT;

#ifdef WORDS_BIGENDIAN

# define _Py_OPCODE(word) ((word) >> 8)

# define _Py_OPARG(word) ((word) & 255)

#else

# define _Py_OPCODE(word) ((word) & 255)

# define _Py_OPARG(word) ((word) >> 8)

#endif

typedef struct _PyOpcache _PyOpcache;

/* Bytecode object */

typedef struct {

PyObject_HEAD

int co_argcount; /* #arguments, except *args */

int co_posonlyargcount; /* #positional only arguments */

int co_kwonlyargcount; /* #keyword only arguments */

int co_nlocals; /* #local variables */

int co_stacksize; /* #entries needed for evaluation stack */

int co_flags; /* CO_..., see below */

int co_firstlineno; /* first source line number */

PyObject *co_code; /* instruction opcodes */

PyObject *co_consts; /* list (constants used) */

PyObject *co_names; /* list of strings (names used) */

PyObject *co_varnames; /* tuple of strings (local variable names) */

PyObject *co_freevars; /* tuple of strings (free variable names) */

PyObject *co_cellvars; /* tuple of strings (cell variable names) */

/* The rest aren't used in either hash or comparisons, except for co_name,

used in both. This is done to preserve the name and line number

for tracebacks and debuggers; otherwise, constant de-duplication

would collapse identical functions/lambdas defined on different lines.

Py_ssize_t *co_cell2arg; /* Maps cell vars which are arguments. */

PyObject *co_filename; /* unicode (where it was loaded from) */

PyObject *co_name; /* unicode (name, for reference) */

PyObject *co_lnotab; /* string (encoding addr<->lineno mapping) See

Objects/lnotab_notes.txt for details. */

void *co_zombieframe; /* for optimization only (see frameobject.c) */

PyObject *co_weakreflist; /* to support weakrefs to code objects */

/* Scratch space for extra data relating to the code object.

Type is a void* to keep the format private in codeobject.c to force

people to go through the proper APIs. */

void *co_extra;

/* Per opcodes just-in-time cache

* To reduce cache size, we use indirect mapping from opcode index to

* cache object:

* cache = co_opcache[co_opcache_map[next_instr - first_instr] - 1]

// co_opcache_map is indexed by (next_instr - first_instr).

// * 0 means there is no cache for this opcode.

// * n > 0 means there is cache in co_opcache[n-1].

unsigned char *co_opcache_map;

_PyOpcache *co_opcache;

int co_opcache_flag; // used to determine when create a cache.

unsigned char co_opcache_size; // length of co_opcache.

} PyCodeObject;

/* Masks for co_flags above */

#define CO_OPTIMIZED 0x0001

#define CO_NEWLOCALS 0x0002

#define CO_VARARGS 0x0004

#define CO_VARKEYWORDS 0x0008

#define CO_NESTED 0x0010

#define CO_GENERATOR 0x0020

/* The CO_NOFREE flag is set if there are no free or cell variables.

This information is redundant, but it allows a single flag test

to determine whether there is any extra work to be done when the

call frame it setup.

#define CO_NOFREE 0x0040

/* The CO_COROUTINE flag is set for coroutine functions (defined with

``async def`` keywords) */

#define CO_COROUTINE 0x0080

#define CO_ITERABLE_COROUTINE 0x0100

#define CO_ASYNC_GENERATOR 0x0200

/* bpo-39562: These constant values are changed in Python 3.9

to prevent collision with compiler flags. CO_FUTURE_ and PyCF_

constants must be kept unique. PyCF_ constants can use bits from

0x0100 to 0x10000. CO_FUTURE_ constants use bits starting at 0x20000. */

#define CO_FUTURE_DIVISION 0x20000

#define CO_FUTURE_ABSOLUTE_IMPORT 0x40000 /* do absolute imports by default */

#define CO_FUTURE_WITH_STATEMENT 0x80000

#define CO_FUTURE_PRINT_FUNCTION 0x100000

#define CO_FUTURE_UNICODE_LITERALS 0x200000

#define CO_FUTURE_BARRY_AS_BDFL 0x400000

#define CO_FUTURE_GENERATOR_STOP 0x800000

#define CO_FUTURE_ANNOTATIONS 0x1000000

/* This value is found in the co_cell2arg array when the associated cell

variable does not correspond to an argument. */

#define CO_CELL_NOT_AN_ARG (-1)

/* This should be defined if a future statement modifies the syntax.

For example, when a keyword is added.

#define PY_PARSER_REQUIRES_FUTURE_KEYWORD

#define CO_MAXBLOCKS 20 /* Max static block nesting within a function */

PyAPI_DATA(PyTypeObject) PyCode_Type;

#define PyCode_Check(op) (Py_TYPE(op) == &PyCode_Type)

#define PyCode_GetNumFree(op) (PyTuple_GET_SIZE((op)->co_freevars))

/* Public interface */

PyAPI_FUNC(PyCodeObject *) PyCode_New(

int, int, int, int, int, PyObject *, PyObject *,

PyObject *, PyObject *, PyObject *, PyObject *,

PyObject *, PyObject *, int, PyObject *);

PyAPI_FUNC(PyCodeObject *) PyCode_NewWithPosOnlyArgs(

int, int, int, int, int, int, PyObject *, PyObject *,

PyObject *, PyObject *, PyObject *, PyObject *,

PyObject *, PyObject *, int, PyObject *);

/* same as struct above */

/* Creates a new empty code object with the specified source location. */

PyAPI_FUNC(PyCodeObject *)

PyCode_NewEmpty(const char *filename, const char *funcname, int firstlineno);

/* Return the line number associated with the specified bytecode index

in this code object. If you just need the line number of a frame,

use PyFrame_GetLineNumber() instead. */

PyAPI_FUNC(int) PyCode_Addr2Line(PyCodeObject *, int);

/* for internal use only */

typedef struct _addr_pair {

int ap_lower;

int ap_upper;

} PyAddrPair;

#ifndef Py_LIMITED_API

/* Update *bounds to describe the first and one-past-the-last instructions in the

same line as lasti. Return the number of that line.

PyAPI_FUNC(int) _PyCode_CheckLineNumber(PyCodeObject* co,

int lasti, PyAddrPair *bounds);

/* Create a comparable key used to compare constants taking in account the

* object type. It is used to make sure types are not coerced (e.g., float and

* complex) _and_ to distinguish 0.0 from -0.0 e.g. on IEEE platforms

* Return (type(obj), obj, ...): a tuple with variable size (at least 2 items)

* depending on the type and the value. The type is the first item to not

* compare bytes and str which can raise a BytesWarning exception. */

PyAPI_FUNC(PyObject*) _PyCode_ConstantKey(PyObject *obj);

#endif

PyAPI_FUNC(PyObject*) PyCode_Optimize(PyObject *code, PyObject* consts,

PyObject *names, PyObject *lnotab);

#ifndef Py_LIMITED_API

PyAPI_FUNC(int) _PyCode_GetExtra(PyObject *code, Py_ssize_t index,

void **extra);

PyAPI_FUNC(int) _PyCode_SetExtra(PyObject *code, Py_ssize_t index,

void *extra);

#endif

#ifdef __cplusplus

}

#endif

#endif /* !Py_CODE_H */

#endif /* Py_LIMITED_API */

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