1import marshal
2import bkfile
3
4
5# Write a file containing frozen code for the modules in the dictionary.
6
7header = """
8#include "Python.h"
9
10static struct _frozen _PyImport_FrozenModules[] = {
11"""
12trailer = """\
13    {0, 0, 0} /* sentinel */
14};
15"""
16
17# if __debug__ == 0 (i.e. -O option given), set Py_OptimizeFlag in frozen app.
18default_entry_point = """
19int
20main(int argc, char **argv)
21{
22        extern int Py_FrozenMain(int, char **);
23""" + ((not __debug__ and """
24        Py_OptimizeFlag++;
25""") or "")  + """
26        PyImport_FrozenModules = _PyImport_FrozenModules;
27        return Py_FrozenMain(argc, argv);
28}
29
30"""
31
32def makefreeze(base, dict, debug=0, entry_point=None, fail_import=()):
33    if entry_point is None: entry_point = default_entry_point
34    done = []
35    files = []
36    mods = sorted(dict.keys())
37    for mod in mods:
38        m = dict[mod]
39        mangled = "__".join(mod.split("."))
40        if m.__code__:
41            file = 'M_' + mangled + '.c'
42            with bkfile.open(base + file, 'w') as outfp:
43                files.append(file)
44                if debug:
45                    print("freezing", mod, "...")
46                str = marshal.dumps(m.__code__)
47                size = len(str)
48                is_package = '0'
49                if m.__path__:
50                    is_package = '1'
51                done.append((mod, mangled, size, is_package))
52                writecode(outfp, mangled, str)
53    if debug:
54        print("generating table of frozen modules")
55    with bkfile.open(base + 'frozen.c', 'w') as outfp:
56        for mod, mangled, size, _ in done:
57            outfp.write('extern unsigned char M_%s[];\n' % mangled)
58        outfp.write(header)
59        for mod, mangled, size, is_package in done:
60            outfp.write('\t{"%s", M_%s, %d, %s},\n' % (mod, mangled, size, is_package))
61        outfp.write('\n')
62        # The following modules have a NULL code pointer, indicating
63        # that the frozen program should not search for them on the host
64        # system. Importing them will *always* raise an ImportError.
65        # The zero value size is never used.
66        for mod in fail_import:
67            outfp.write('\t{"%s", NULL, 0},\n' % (mod,))
68        outfp.write(trailer)
69        outfp.write(entry_point)
70    return files
71
72
73
74# Write a C initializer for a module containing the frozen python code.
75# The array is called M_<mod>.
76
77def writecode(fp, mod, data):
78    print('unsigned char M_%s[] = {' % mod, file=fp)
79    indent = ' ' * 4
80    for i in range(0, len(data), 16):
81        print(indent, file=fp, end='')
82        for c in bytes(data[i:i+16]):
83            print('%d,' % c, file=fp, end='')
84        print('', file=fp)
85    print('};', file=fp)
86