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037bbc8e YPK |
1 | /* Readline support for Python. |
2 | ||
42a4f53d | 3 | Copyright (C) 2012-2019 Free Software Foundation, Inc. |
037bbc8e YPK |
4 | |
5 | This file is part of GDB. | |
6 | ||
7 | This program is free software; you can redistribute it and/or modify | |
8 | it under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 3 of the License, or | |
10 | (at your option) any later version. | |
11 | ||
12 | This program is distributed in the hope that it will be useful, | |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15 | GNU General Public License for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #include "defs.h" | |
21 | #include "python-internal.h" | |
037bbc8e YPK |
22 | #include "top.h" |
23 | #include "cli/cli-utils.h" | |
6f8b0407 | 24 | |
037bbc8e YPK |
25 | /* Readline function suitable for PyOS_ReadlineFunctionPointer, which |
26 | is used for Python's interactive parser and raw_input. In both | |
27 | cases, sys_stdin and sys_stdout are always stdin and stdout | |
28 | respectively, as far as I can tell; they are ignored and | |
29 | command_line_input is used instead. */ | |
30 | ||
31 | static char * | |
32 | gdbpy_readline_wrapper (FILE *sys_stdin, FILE *sys_stdout, | |
38bcc89d SM |
33 | #if PY_MAJOR_VERSION == 3 && PY_MINOR_VERSION >= 4 |
34 | const char *prompt) | |
35 | #else | |
037bbc8e | 36 | char *prompt) |
38bcc89d | 37 | #endif |
037bbc8e YPK |
38 | { |
39 | int n; | |
5799c0b9 | 40 | char *p = NULL, *q; |
037bbc8e | 41 | |
a70b8144 | 42 | try |
492d29ea | 43 | { |
89fbedf3 | 44 | p = command_line_input (prompt, "python"); |
492d29ea | 45 | } |
037bbc8e | 46 | /* Handle errors by raising Python exceptions. */ |
230d2906 | 47 | catch (const gdb_exception &except) |
037bbc8e | 48 | { |
492d29ea PA |
49 | /* Detect user interrupt (Ctrl-C). */ |
50 | if (except.reason == RETURN_QUIT) | |
51 | return NULL; | |
52 | ||
037bbc8e YPK |
53 | /* The thread state is nulled during gdbpy_readline_wrapper, |
54 | with the original value saved in the following undocumented | |
55 | variable (see Python's Parser/myreadline.c and | |
56 | Modules/readline.c). */ | |
57 | PyEval_RestoreThread (_PyOS_ReadlineTState); | |
58 | gdbpy_convert_exception (except); | |
59 | PyEval_SaveThread (); | |
60 | return NULL; | |
61 | } | |
62 | ||
63 | /* Detect EOF (Ctrl-D). */ | |
64 | if (p == NULL) | |
65 | { | |
6f8b0407 | 66 | q = (char *) PyMem_RawMalloc (1); |
037bbc8e YPK |
67 | if (q != NULL) |
68 | q[0] = '\0'; | |
69 | return q; | |
70 | } | |
71 | ||
72 | n = strlen (p); | |
73 | ||
74 | /* Copy the line to Python and return. */ | |
6f8b0407 | 75 | q = (char *) PyMem_RawMalloc (n + 2); |
037bbc8e YPK |
76 | if (q != NULL) |
77 | { | |
a9f26f60 | 78 | strcpy (q, p); |
037bbc8e YPK |
79 | q[n] = '\n'; |
80 | q[n + 1] = '\0'; | |
81 | } | |
82 | return q; | |
83 | } | |
84 | ||
85 | /* Initialize Python readline support. */ | |
86 | ||
87 | void | |
88 | gdbpy_initialize_gdb_readline (void) | |
89 | { | |
90 | /* Python's readline module conflicts with GDB's use of readline | |
91 | since readline is not reentrant. Ideally, a reentrant wrapper to | |
92 | GDB's readline should be implemented to replace Python's readline | |
93 | and prevent conflicts. For now, this file implements a | |
94 | sys.meta_path finder that simply fails to import the readline | |
95 | module. */ | |
999633ed | 96 | if (PyRun_SimpleString ("\ |
037bbc8e YPK |
97 | import sys\n\ |
98 | \n\ | |
99 | class GdbRemoveReadlineFinder:\n\ | |
100 | def find_module(self, fullname, path=None):\n\ | |
101 | if fullname == 'readline' and path is None:\n\ | |
102 | return self\n\ | |
103 | return None\n\ | |
104 | \n\ | |
105 | def load_module(self, fullname):\n\ | |
106 | raise ImportError('readline module disabled under GDB')\n\ | |
107 | \n\ | |
108 | sys.meta_path.append(GdbRemoveReadlineFinder())\n\ | |
999633ed TT |
109 | ") == 0) |
110 | PyOS_ReadlineFunctionPointer = gdbpy_readline_wrapper; | |
037bbc8e YPK |
111 | } |
112 |