drgn/libdrgn/python/drgnpy.h

// Copyright (c) Facebook, Inc. and its affiliates.
// SPDX-License-Identifier: GPL-3.0+

#ifndef DRGNPY_H
#define DRGNPY_H

#define PY_SSIZE_T_CLEAN

// IWYU pragma: begin_exports
#include <Python.h>
#include "structmember.h"

#include "docstrings.h"
#include "../drgn.h"
// IWYU pragma: end_exports

#include "../hash_table.h"
#include "../program.h"

/* These were added in Python 3.7. */
#ifndef Py_UNREACHABLE
#define Py_UNREACHABLE() abort()
#endif
#ifndef Py_RETURN_RICHCOMPARE
#define Py_RETURN_RICHCOMPARE(val1, val2, op)                               \
    do {                                                                    \
        switch (op) {                                                       \
        case Py_EQ: if ((val1) == (val2)) Py_RETURN_TRUE; Py_RETURN_FALSE;  \
        case Py_NE: if ((val1) != (val2)) Py_RETURN_TRUE; Py_RETURN_FALSE;  \
        case Py_LT: if ((val1) < (val2)) Py_RETURN_TRUE; Py_RETURN_FALSE;   \
        case Py_GT: if ((val1) > (val2)) Py_RETURN_TRUE; Py_RETURN_FALSE;   \
        case Py_LE: if ((val1) <= (val2)) Py_RETURN_TRUE; Py_RETURN_FALSE;  \
        case Py_GE: if ((val1) >= (val2)) Py_RETURN_TRUE; Py_RETURN_FALSE;  \
        default:                                                            \
            Py_UNREACHABLE();                                               \
        }                                                                   \
    } while (0)
#endif

#define DRGNPY_PUBLIC __attribute__((visibility("default")))

#define Py_RETURN_BOOL(cond) do {	\
	if (cond)			\
		Py_RETURN_TRUE;		\
	else				\
		Py_RETURN_FALSE;	\
} while (0)

typedef struct {
	PyObject_HEAD
	struct drgn_object obj;
} DrgnObject;

typedef struct {
	PyObject_HEAD
	struct drgn_type *type;
	enum drgn_qualifiers qualifiers;
	/*
	 * Cache of attributes which were previously converted from a struct
	 * drgn_type member or used to create the type.
	 */
	PyObject *attr_cache;
} DrgnType;

typedef struct {
	PyObject_HEAD
	/*
	 * "Python-friendly" name used for the object, which may differ from the
	 * language name if the language name is not a valid identifier (e.g.,
	 * C++).
	 */
	const char *attr_name;
	const struct drgn_language *language;
} Language;

typedef struct {
	PyObject_HEAD
	DrgnObject *obj;
	uint64_t length, index;
} ObjectIterator;

typedef struct {
	PyObject_HEAD
	struct drgn_platform *platform;
} Platform;

DEFINE_HASH_SET_TYPE(pyobjectp_set, PyObject *)

typedef struct {
	PyObject_HEAD
	struct drgn_program prog;
	PyObject *cache;
	/*
	 * Set of objects that we need to hold a reference to during the
	 * lifetime of the Program.
	 */
	struct pyobjectp_set objects;
} Program;

typedef struct {
	PyObject_HEAD
	struct drgn_stack_trace *trace;
} StackTrace;

typedef struct {
	PyObject_HEAD
	StackTrace *trace;
	size_t i;
} StackFrame;

typedef struct {
	PyObject_HEAD
	Program *prog;
	struct drgn_symbol *sym;
} Symbol;

typedef struct {
	PyObject_HEAD
	PyObject *name;
	PyObject *value;
} TypeEnumerator;

typedef struct {
	PyObject_HEAD
	PyObject *obj;
	/*
	 * If DRGNPY_LAZY_OBJECT_EVALUATED, obj is the evaluated Object.
	 * If DRGNPY_LAZY_OBJECT_CALLABLE, obj is a Python callable that should
	 * return the Object.
	 * Otherwise, this must be evaluated and wrapped, and obj is a reference
	 * required to keep this alive.
	 */
	union drgn_lazy_object *lazy_obj;
} LazyObject;

typedef struct {
	LazyObject lazy_obj;
	PyObject *name;
	PyObject *bit_offset;
} TypeMember;

typedef struct {
	LazyObject lazy_obj;
	PyObject *name;
} TypeParameter;

typedef struct {
	LazyObject lazy_obj;
	PyObject *name;
	PyObject *is_default;
} TypeTemplateParameter;

extern PyObject *Architecture_class;
extern PyObject *FindObjectFlags_class;
extern PyObject *PlatformFlags_class;
extern PyObject *PrimitiveType_class;
extern PyObject *ProgramFlags_class;
extern PyObject *Qualifiers_class;
extern PyObject *TypeKind_class;
extern PyStructSequence_Desc Register_desc;
extern PyTypeObject DrgnObject_type;
extern PyTypeObject DrgnType_type;
extern PyTypeObject FaultError_type;
extern PyTypeObject Language_type;
extern PyTypeObject ObjectIterator_type;
extern PyTypeObject Platform_type;
extern PyTypeObject Program_type;
extern PyTypeObject Register_type;
extern PyTypeObject StackFrame_type;
extern PyTypeObject StackTrace_type;
extern PyTypeObject Symbol_type;
extern PyTypeObject TypeEnumerator_type;
extern PyTypeObject TypeMember_type;
extern PyTypeObject TypeParameter_type;
extern PyTypeObject TypeTemplateParameter_type;
extern PyObject *MissingDebugInfoError;
extern PyObject *ObjectAbsentError;
extern PyObject *OutOfBoundsError;

int add_module_constants(PyObject *m);

bool set_drgn_in_python(void);
void clear_drgn_in_python(void);
struct drgn_error *drgn_error_from_python(void);
void *set_drgn_error(struct drgn_error *err);
void *set_error_type_name(const char *format,
			  struct drgn_qualified_type qualified_type);

PyObject *Language_wrap(const struct drgn_language *language);
int language_converter(PyObject *o, void *p);
int add_languages(void);

static inline DrgnObject *DrgnObject_alloc(Program *prog)
{
	DrgnObject *ret;

	ret = (DrgnObject *)DrgnObject_type.tp_alloc(&DrgnObject_type, 0);
	if (ret) {
		drgn_object_init(&ret->obj, &prog->prog);
		Py_INCREF(prog);
	}
	return ret;
}
static inline Program *DrgnObject_prog(DrgnObject *obj)
{
	return container_of(drgn_object_program(&obj->obj), Program, prog);
}
PyObject *DrgnObject_NULL(PyObject *self, PyObject *args, PyObject *kwds);
DrgnObject *cast(PyObject *self, PyObject *args, PyObject *kwds);
DrgnObject *reinterpret(PyObject *self, PyObject *args, PyObject *kwds);
DrgnObject *DrgnObject_container_of(PyObject *self, PyObject *args,
				    PyObject *kwds);

PyObject *Platform_wrap(const struct drgn_platform *platform);

int Program_hold_object(Program *prog, PyObject *obj);
bool Program_hold_reserve(Program *prog, size_t n);
int Program_type_arg(Program *prog, PyObject *type_obj, bool can_be_none,
		     struct drgn_qualified_type *ret);
Program *program_from_core_dump(PyObject *self, PyObject *args, PyObject *kwds);
Program *program_from_kernel(PyObject *self);
Program *program_from_pid(PyObject *self, PyObject *args, PyObject *kwds);

PyObject *Symbol_wrap(struct drgn_symbol *sym, Program *prog);

static inline Program *DrgnType_prog(DrgnType *type)
{
	return container_of(drgn_type_program(type->type), Program, prog);
}
PyObject *DrgnType_wrap(struct drgn_qualified_type qualified_type);
DrgnType *Program_void_type(Program *self, PyObject *args, PyObject *kwds);
DrgnType *Program_int_type(Program *self, PyObject *args, PyObject *kwds);
DrgnType *Program_bool_type(Program *self, PyObject *args, PyObject *kwds);
DrgnType *Program_float_type(Program *self, PyObject *args, PyObject *kwds);
DrgnType *Program_complex_type(Program *self, PyObject *args, PyObject *kwds);
DrgnType *Program_struct_type(Program *self, PyObject *args, PyObject *kwds);
DrgnType *Program_union_type(Program *self, PyObject *args, PyObject *kwds);
DrgnType *Program_class_type(Program *self, PyObject *args, PyObject *kwds);
DrgnType *Program_enum_type(Program *self, PyObject *args, PyObject *kwds);
DrgnType *Program_typedef_type(Program *self, PyObject *args, PyObject *kwds);
DrgnType *Program_pointer_type(Program *self, PyObject *args, PyObject *kwds);
DrgnType *Program_array_type(Program *self, PyObject *args, PyObject *kwds);
DrgnType *Program_function_type(Program *self, PyObject *args, PyObject *kwds);

int append_string(PyObject *parts, const char *s);
int append_format(PyObject *parts, const char *format, ...);
PyObject *join_strings(PyObject *parts);
PyObject *byteorder_string(bool little_endian);

struct byteorder_arg {
	bool allow_none;
	bool is_none;
	enum drgn_byte_order value;
};
int byteorder_converter(PyObject *o, void *p);

struct index_arg {
	bool allow_none;
	bool is_none;
	bool is_signed;
	union {
		unsigned long long uvalue;
		long long svalue;
	};
};
int index_converter(PyObject *o, void *p);

/* Helpers for path arguments based on posixmodule.c in CPython. */
struct path_arg {
	bool allow_none;
	char *path;
	Py_ssize_t length;
	PyObject *object;
	PyObject *cleanup;
};
int path_converter(PyObject *o, void *p);
void path_cleanup(struct path_arg *path);

struct enum_arg {
	PyObject *type;
	unsigned long value;
	bool allow_none;
};
int enum_converter(PyObject *o, void *p);

PyObject *drgnpy_linux_helper_read_vm(PyObject *self, PyObject *args,
				      PyObject *kwds);
DrgnObject *drgnpy_linux_helper_radix_tree_lookup(PyObject *self,
						  PyObject *args,
						  PyObject *kwds);
DrgnObject *drgnpy_linux_helper_idr_find(PyObject *self, PyObject *args,
					 PyObject *kwds);
DrgnObject *drgnpy_linux_helper_find_pid(PyObject *self, PyObject *args,
					 PyObject *kwds);
DrgnObject *drgnpy_linux_helper_pid_task(PyObject *self, PyObject *args,
					 PyObject *kwds);
DrgnObject *drgnpy_linux_helper_find_task(PyObject *self, PyObject *args,
					  PyObject *kwds);
PyObject *drgnpy_linux_helper_task_state_to_char(PyObject *self, PyObject *args,
						 PyObject *kwds);
PyObject *drgnpy_linux_helper_kaslr_offset(PyObject *self, PyObject *args,
					   PyObject *kwds);
PyObject *drgnpy_linux_helper_pgtable_l5_enabled(PyObject *self, PyObject *args,
						 PyObject *kwds);

#endif /* DRGNPY_H */