Add support for auto-loading scripts from .debug_gdb_scripts section.

	* NEWS: Add entry for .debug_gdb_scripts.
	* Makefile.in SUBDIR_PYTHON_OBS): Add py-auto-load.o.
	(SUBDIR_PYTHON_SRCS): Add py-auto-load.c.
	(py-auto-load.o): New rule.
	* cli/cli-cmds.c (find_and_open_script): Make externally visible.
	* cli/cli-cmds.h (find_and_open_script): Update prototype.
	* python/py-auto-load.c: New file.
	* python/python-internal.h: #include <stdio.h>.
	(set_python_list, show_python_list): Declare.
	(gdbpy_initialize_auto_load): Declare.
	(source_python_script_for_objfile): Declare.
	* python/python.c: Remove #include of observer.h.
	(gdbpy_auto_load): Moved to py-auto-load.c.
	(GDBPY_AUTO_FILENAME): Ditto.
	(gdbpy_new_objfile): Delete.
	(source_python_script_for_objfile): New function.
	(set_python_list, show_python_list): Make externally visible.
	(_initialize_python): Move "auto-load" command to py-auto-load.c
	and observer_attach_new_objfile to py-auto-load.c.

	doc/
	* gdb.texinfo (Python): Move Auto-loading section here ...
	(Python API): from here.
	(Auto-loading): Add docs for .debug_gdb_scripts auto-loaded scripts.
	(Maintenance Commands): Add docs for "maint print section-scripts".

	testsuite/
	* gdb.python/py-section-script.c: New file.
	* gdb.python/py-section-script.exp: New file.
	* gdb.python/py-section-script.py: New file.

3 files changed, 180 insertions, 0 deletions

diff --git a/gdb/testsuite/gdb.python/py-section-script.c b/gdb/testsuite/gdb.python/py-section-script.c
new file mode 100644
index 0000000..86a7518
--- /dev/null
+++ b/gdb/testsuite/gdb.python/py-section-script.c
@@ -0,0 +1,52 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2010 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
+
+/* Put the path to the pretty-printer script in .debug_gdb_scripts so
+   gdb will automagically loaded it.  */
+
+#define DEFINE_GDB_SCRIPT(script_name) \
+  asm("\
+.pushsection \".debug_gdb_scripts\", \"MS\",@progbits,1\n\
+.byte 1\n\
+.asciz \"" script_name "\"\n\
+.popsection \n\
+");
+
+DEFINE_GDB_SCRIPT ("py-section-script.py")
+
+struct ss
+{
+  int a;
+  int b;
+};
+
+void
+init_ss (struct ss *s, int a, int b)
+{
+  s->a = a;
+  s->b = b;
+}
+
+int
+main ()
+{
+  struct ss ss;
+
+  init_ss (&ss, 1, 2);
+
+  return 0;      /* break to inspect struct and union */
+}
diff --git a/gdb/testsuite/gdb.python/py-section-script.exp b/gdb/testsuite/gdb.python/py-section-script.exp
new file mode 100644
index 0000000..8a93ca8
--- /dev/null
+++ b/gdb/testsuite/gdb.python/py-section-script.exp
@@ -0,0 +1,65 @@
+# Copyright (C) 2010 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# This file is part of the GDB testsuite.  It tests automagic loading of
+# scripts specified in the .debug_gdb_scripts section.
+
+# This test can only be run on targets which support ELF and use gas.
+# For now pick a sampling of likely targets.
+if {![istarget *-*-linux*]
+    && ![istarget *-*-gnu*]
+    && ![istarget *-*-elf*]
+    && ![istarget *-*-openbsd*]
+    && ![istarget arm-*-eabi*]
+    && ![istarget powerpc-*-eabi*]} {
+    verbose "Skipping py-section-script.exp because of lack of support."
+    return
+}
+
+if $tracelevel then {
+    strace $tracelevel
+}
+
+set testfile "py-section-script"
+set srcfile ${testfile}.c
+set binfile ${objdir}/${subdir}/${testfile}
+if { [gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable {debug}] != "" } {
+    untested "Couldn't compile ${srcfile}"
+    return -1
+}
+
+# Make this available to gdb before the program starts, it is
+# automagically loaded by gdb.
+set remote_python_file [remote_download host ${srcdir}/${subdir}/${testfile}.py]
+
+# Start with a fresh gdb.
+
+gdb_exit
+gdb_start
+gdb_reinitialize_dir $srcdir/$subdir
+gdb_load ${binfile}
+
+if ![runto_main] {
+    perror "couldn't run to main"
+    return
+}
+
+gdb_test "b [gdb_get_line_number {break to inspect} ${testfile}.c ]" \
+    ".*Breakpoint.*"
+gdb_test "continue" ".*Breakpoint.*"
+
+gdb_test "print ss" " = a=<1> b=<2>"
+
+remote_file host delete ${remote_python_file}
diff --git a/gdb/testsuite/gdb.python/py-section-script.py b/gdb/testsuite/gdb.python/py-section-script.py
new file mode 100644
index 0000000..750b67c
--- /dev/null
+++ b/gdb/testsuite/gdb.python/py-section-script.py
@@ -0,0 +1,63 @@
+# Copyright (C) 2010 Free Software Foundation, Inc.
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+# This file is part of the GDB testsuite.
+
+import re
+
+class pp_ss:
+    def __init__(self, val):
+        self.val = val
+
+    def to_string(self):
+        return "a=<" + str(self.val["a"]) + "> b=<" + str(self.val["b"]) + ">"
+
+def lookup_function (val):
+    "Look-up and return a pretty-printer that can print val."
+
+    # Get the type.
+    type = val.type
+
+    # If it points to a reference, get the reference.
+    if type.code == gdb.TYPE_CODE_REF:
+        type = type.target ()
+
+    # Get the unqualified type, stripped of typedefs.
+    type = type.unqualified ().strip_typedefs ()
+
+    # Get the type name.    
+    typename = type.tag
+
+    if typename == None:
+        return None
+
+    # Iterate over local dictionary of types to determine
+    # if a printer is registered for that type.  Return an
+    # instantiation of the printer if found.
+    for function in pretty_printers_dict:
+        if function.match (typename):
+            return pretty_printers_dict[function] (val)
+        
+    # Cannot find a pretty printer.  Return None.
+
+    return None
+
+def register_pretty_printers ():
+    pretty_printers_dict[re.compile ('^ss$')]  = pp_ss
+
+pretty_printers_dict = {}
+
+register_pretty_printers ()
+gdb.current_progspace().pretty_printers.append (lookup_function)