summaryrefslogtreecommitdiffstats
path: root/Programs/_freeze_importlib.c
blob: 1069966a1876ed61a195aa2fefaa56340a483d95 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
/* 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';

    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;
}