Enable readline in Python in a GDB-specific way and block the
standard Python readline module to prevent conflicts with GDB. * Makefile.in (SUBDIR_PYTHON_OBS): Add py-gdb-readline.o. (SUBDIR_PYTHON_SRCS): Add python/py-gdb-readline.c. (py-gdb-readline.o): Add rule to compile python/py-gdb-readline.c. * python/py-gdb-readline.c: New file. * python/python-internal.h (gdbpy_initialize_gdb_readline): New prototype. * python/python.c (_initialize_python): Call gdbpy_initialize_gdb_readline.
This commit is contained in:
parent
406b1477f5
commit
037bbc8eea
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@ -1,3 +1,16 @@
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2012-08-22 Khoo Yit Phang <khooyp@cs.umd.edu>
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Enable readline in Python in a GDB-specific way and block the
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standard Python readline module to prevent conflicts with GDB.
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* Makefile.in (SUBDIR_PYTHON_OBS): Add py-gdb-readline.o.
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(SUBDIR_PYTHON_SRCS): Add python/py-gdb-readline.c.
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(py-gdb-readline.o): Add rule to compile python/py-gdb-readline.c.
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* python/py-gdb-readline.c: New file.
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* python/python-internal.h (gdbpy_initialize_gdb_readline): New
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prototype.
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* python/python.c (_initialize_python): Call
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gdbpy_initialize_gdb_readline.
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2012-08-22 Keith Seitz <keiths@redhat.com>
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* defs.h: Include build-gnulib/config.h
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@ -280,6 +280,7 @@ SUBDIR_PYTHON_OBS = \
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py-finishbreakpoint.o \
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py-frame.o \
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py-function.o \
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py-gdb-readline.o \
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py-inferior.o \
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py-infthread.o \
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py-lazy-string.o \
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@ -312,6 +313,7 @@ SUBDIR_PYTHON_SRCS = \
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python/py-finishbreakpoint.c \
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python/py-frame.c \
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python/py-function.c \
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python/py-gdb-readline.c \
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python/py-inferior.c \
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python/py-infthread.c \
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python/py-lazy-string.c \
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@ -2083,6 +2085,10 @@ py-function.o: $(srcdir)/python/py-function.c
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$(COMPILE) $(PYTHON_CFLAGS) $(srcdir)/python/py-function.c
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$(POSTCOMPILE)
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py-gdb-readline.o: $(srcdir)/python/py-gdb-readline.c
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$(COMPILE) $(PYTHON_CFLAGS) $(srcdir)/python/py-gdb-readline.c
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$(POSTCOMPILE)
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py-inferior.o: $(srcdir)/python/py-inferior.c
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$(COMPILE) $(PYTHON_CFLAGS) $(srcdir)/python/py-inferior.c
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$(POSTCOMPILE)
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@ -0,0 +1,113 @@
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/* Readline support for Python.
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Copyright (C) 2012 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "python-internal.h"
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#include "exceptions.h"
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#include "top.h"
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#include "cli/cli-utils.h"
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#include "gdb_string.h"
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#include <stddef.h>
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/* Readline function suitable for PyOS_ReadlineFunctionPointer, which
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is used for Python's interactive parser and raw_input. In both
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cases, sys_stdin and sys_stdout are always stdin and stdout
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respectively, as far as I can tell; they are ignored and
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command_line_input is used instead. */
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static char *
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gdbpy_readline_wrapper (FILE *sys_stdin, FILE *sys_stdout,
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char *prompt)
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{
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int n;
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char *p = NULL, *p_start, *p_end, *q;
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volatile struct gdb_exception except;
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TRY_CATCH (except, RETURN_MASK_ALL)
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p = command_line_input (prompt, 0, "python");
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/* Detect user interrupt (Ctrl-C). */
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if (except.reason == RETURN_QUIT)
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return NULL;
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/* Handle errors by raising Python exceptions. */
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if (except.reason < 0)
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{
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/* The thread state is nulled during gdbpy_readline_wrapper,
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with the original value saved in the following undocumented
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variable (see Python's Parser/myreadline.c and
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Modules/readline.c). */
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PyEval_RestoreThread (_PyOS_ReadlineTState);
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gdbpy_convert_exception (except);
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PyEval_SaveThread ();
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return NULL;
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}
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/* Detect EOF (Ctrl-D). */
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if (p == NULL)
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{
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q = PyMem_Malloc (1);
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if (q != NULL)
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q[0] = '\0';
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return q;
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}
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n = strlen (p);
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/* Copy the line to Python and return. */
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q = PyMem_Malloc (n + 2);
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if (q != NULL)
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{
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strncpy (q, p, n);
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q[n] = '\n';
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q[n + 1] = '\0';
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}
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return q;
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}
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/* Initialize Python readline support. */
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void
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gdbpy_initialize_gdb_readline (void)
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{
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/* Python's readline module conflicts with GDB's use of readline
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since readline is not reentrant. Ideally, a reentrant wrapper to
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GDB's readline should be implemented to replace Python's readline
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and prevent conflicts. For now, this file implements a
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sys.meta_path finder that simply fails to import the readline
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module. */
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PyRun_SimpleString ("\
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import sys\n\
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\n\
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class GdbRemoveReadlineFinder:\n\
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def find_module(self, fullname, path=None):\n\
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if fullname == 'readline' and path is None:\n\
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return self\n\
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return None\n\
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\n\
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def load_module(self, fullname):\n\
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raise ImportError('readline module disabled under GDB')\n\
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\n\
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sys.meta_path.append(GdbRemoveReadlineFinder())\n\
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");
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PyOS_ReadlineFunctionPointer = gdbpy_readline_wrapper;
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}
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@ -232,6 +232,7 @@ struct symtab *symtab_object_to_symtab (PyObject *obj);
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struct symtab_and_line *sal_object_to_symtab_and_line (PyObject *obj);
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struct frame_info *frame_object_to_frame_info (PyObject *frame_obj);
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void gdbpy_initialize_gdb_readline (void);
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void gdbpy_initialize_auto_load (void);
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void gdbpy_initialize_values (void);
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void gdbpy_initialize_frames (void);
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@ -1389,6 +1389,7 @@ message == an error message without a stack will be printed."),
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gdbpy_gdberror_exc = PyErr_NewException ("gdb.GdbError", NULL, NULL);
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PyModule_AddObject (gdb_module, "GdbError", gdbpy_gdberror_exc);
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gdbpy_initialize_gdb_readline ();
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gdbpy_initialize_auto_load ();
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gdbpy_initialize_values ();
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gdbpy_initialize_frames ();
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