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162 lines (143 loc) · 4.74 KB
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Copy path_freeze_importlib.c
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162 lines (143 loc) · 4.74 KB
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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 = (size_t)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';
_PyCoreConfig config = _PyCoreConfig_INIT;
config.user_site_directory = 0;
config.site_import = 0;
config.use_environment = 0;
config.program_name = L"./_freeze_importlib";
/* Don't install importlib, since it could execute outdated bytecode. */
config._install_importlib = 0;
config._frozen = 1;
_PyInitError err = _Py_InitializeFromConfig(&config);
/* No need to call _PyCoreConfig_Clear() since we didn't allocate any
memory: program_name is a constant string. */
if (_Py_INIT_FAILED(err)) {
_Py_FatalInitError(err);
}
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;
}