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cpython/Programs/_freeze_importlib.c at 3.5 · python/cpython · GitHub
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_freeze_importlib.c
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/* This is built as a stand-alone executable by the Makefile, and helps turn
Lib/importlib/_bootstrap.py into a frozen module in Python/importlib.h
*/
#include
<Python.h>
#include
<marshal.h>
#include
<stdio.h>
#include
<sys/types.h>
#include
<sys/stat.h>
#ifndef
MS_WINDOWS
#include
<unistd.h>
#endif
/* To avoid a circular dependency on frozen.o, we create our own structure
of frozen modules instead, left deliberately blank so as to avoid
unintentional import of a stale version of _frozen_importlib. */
static
const
struct
_frozen
_PyImport_FrozenModules
[]
=
{
{
0
,
0
,
0
}
/* sentinel */
};
#ifndef
MS_WINDOWS
/* On Windows, this links with the regular pythonXY.dll, so this variable comes
from frozen.obj. In the Makefile, frozen.o is not linked into this executable,
so we define the variable here. */
const
struct
_frozen
*
PyImport_FrozenModules
;
#endif
const
char
header
[]
=
"/* Auto-generated by Programs/_freeze_importlib.c */"
;
int
main
(
int
argc
,
char
*
argv
[])
{
char
*
inpath
,
*
outpath
,
*
code_name
;
FILE
*
infile
=
NULL
,
*
outfile
=
NULL
;
struct
_Py_stat_struct
status
;
size_t
text_size
,
data_size
,
n
;
char
*
text
=
NULL
;
unsigned
char
*
data
;
PyObject
*
code
=
NULL
,
*
marshalled
=
NULL
;
int
is_bootstrap
=
1
;
PyImport_FrozenModules
=
_PyImport_FrozenModules
;
if
(
argc
!=
3
) {
fprintf
(
stderr
,
"need to specify input and output paths\n"
);
return
2
;
}
inpath
=
argv
[
1
];
outpath
=
argv
[
2
];
infile
=
fopen
(
inpath
,
"rb"
);
if
(
infile
==
NULL
) {
fprintf
(
stderr
,
"cannot open '%s' for reading\n"
,
inpath
);
goto
error
;
}
if
(
_Py_fstat_noraise
(
fileno
(
infile
),
&
status
)) {
fprintf
(
stderr
,
"cannot fstat '%s'\n"
,
inpath
);
goto
error
;
}
text_size
=
status
.
st_size
;
text
=
(
char
*
)
malloc
(
text_size
+
1
);
if
(
text
==
NULL
) {
fprintf
(
stderr
,
"could not allocate %ld bytes\n"
, (
long
)
text_size
);
goto
error
;
}
n
=
fread
(
text
,
1
,
text_size
,
infile
);
fclose
(
infile
);
infile
=
NULL
;
if
(
n
<
text_size
) {
fprintf
(
stderr
,
"read too short: got %ld instead of %ld bytes\n"
,
(
long
)
n
, (
long
)
text_size
);
goto
error
;
}
text
[
text_size
]
=
'\0'
;
Py_NoUserSiteDirectory
++
;
Py_NoSiteFlag
++
;
Py_IgnoreEnvironmentFlag
++
;
Py_FrozenFlag
++
;
Py_SetProgramName
(
L"./_freeze_importlib"
);
/* Don't install importlib, since it could execute outdated bytecode. */
_Py_InitializeEx_Private
(
1
,
0
);
if
(
strstr
(
inpath
,
"_external"
)
!=
NULL
) {
is_bootstrap
=
0
;
}
code_name
=
is_bootstrap
?
"<frozen importlib._bootstrap>"
:
"<frozen importlib._bootstrap_external>"
;
code
=
Py_CompileStringExFlags
(
text
,
code_name
,
Py_file_input
,
NULL
,
0
);
if
(
code
==
NULL
)
goto
error
;
free
(
text
);
text
=
NULL
;
marshalled
=
PyMarshal_WriteObjectToString
(
code
,
Py_MARSHAL_VERSION
);
Py_CLEAR
(
code
);
if
(
marshalled
==
NULL
)
goto
error
;
assert
(
PyBytes_CheckExact
(
marshalled
));
data
=
(
unsigned
char
*
)
PyBytes_AS_STRING
(
marshalled
);
data_size
=
PyBytes_GET_SIZE
(
marshalled
);
/* Open the file in text mode. The hg checkout should be using the eol extension,
which in turn should cause the EOL style match the C library's text mode */
outfile
=
fopen
(
outpath
,
"w"
);
if
(
outfile
==
NULL
) {
fprintf
(
stderr
,
"cannot open '%s' for writing\n"
,
outpath
);
goto
error
;
}
fprintf
(
outfile
,
"%s\n"
,
header
);
if
(
is_bootstrap
)
fprintf
(
outfile
,
"const unsigned char _Py_M__importlib[] = {\n"
);
else
fprintf
(
outfile
,
"const unsigned char _Py_M__importlib_external[] = {\n"
);
for
(
n
=
0
;
n
<
data_size
;
n
+=
16
) {
size_t
i
,
end
=
Py_MIN
(
n
+
16
,
data_size
);
fprintf
(
outfile
,
" "
);
for
(
i
=
n
;
i
<
end
;
i
++
) {
fprintf
(
outfile
,
"%d,"
, (
unsigned
int
)
data
[
i
]);
}
fprintf
(
outfile
,
"\n"
);
}
fprintf
(
outfile
,
"};\n"
);
Py_CLEAR
(
marshalled
);
Py_Finalize
();
if
(
outfile
) {
if
(
ferror
(
outfile
)) {
fprintf
(
stderr
,
"error when writing to '%s'\n"
,
outpath
);
goto
error
;
}
fclose
(
outfile
);
}
return
0
;
error
:
PyErr_Print
();
Py_Finalize
();
if
(
infile
)
fclose
(
infile
);
if
(
outfile
)
fclose
(
outfile
);
if
(
text
)
free
(
text
);
if
(
marshalled
)
Py_DECREF
(
marshalled
);
return
1
;
}
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