https://bugzilla.redhat.com/show_bug.cgi?id=1020004
Index: gdb-7.12.50.20170207/gdb/data-directory/Makefile.in
===================================================================
--- gdb-7.12.50.20170207.orig/gdb/data-directory/Makefile.in 2017-02-26 21:10:31.418894975 +0100
+++ gdb-7.12.50.20170207/gdb/data-directory/Makefile.in 2017-02-26 21:11:07.083147930 +0100
@@ -71,6 +71,8 @@
gdb/__init__.py \
gdb/FrameDecorator.py \
gdb/FrameIterator.py \
+ gdb/FrameWrapper.py \
+ gdb/backtrace.py \
gdb/frames.py \
gdb/printing.py \
gdb/prompt.py \
@@ -83,6 +85,7 @@
gdb/command/pahole.py \
gdb/command/xmethods.py \
gdb/command/explore.py \
+ gdb/command/backtrace.py \
gdb/command/frame_filters.py \
gdb/command/pretty_printers.py \
gdb/command/prompt.py \
Index: gdb-7.12.50.20170207/gdb/python/lib/gdb/FrameWrapper.py
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ gdb-7.12.50.20170207/gdb/python/lib/gdb/FrameWrapper.py 2017-02-26 21:10:31.419894983 +0100
@@ -0,0 +1,122 @@
+# Wrapper API for frames.
+
+# Copyright (C) 2008, 2009 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/>.
+
+import gdb
+
+# FIXME: arguably all this should be on Frame somehow.
+class FrameWrapper:
+ def __init__ (self, frame):
+ self.frame = frame;
+
+ def write_symbol (self, stream, sym, block):
+ if len (sym.linkage_name):
+ nsym, is_field_of_this = gdb.lookup_symbol (sym.linkage_name, block)
+ if nsym.addr_class != gdb.SYMBOL_LOC_REGISTER:
+ sym = nsym
+
+ stream.write (sym.print_name + "=")
+ try:
+ val = self.read_var (sym)
+ if val != None:
+ val = str (val)
+ # FIXME: would be nice to have a more precise exception here.
+ except RuntimeError as text:
+ val = text
+ if val == None:
+ stream.write ("???")
+ else:
+ stream.write (str (val))
+
+ def print_frame_locals (self, stream, func):
+
+ try:
+ block = self.frame.block()
+ except RuntimeError:
+ block = None
+
+ while block != None:
+ if block.is_global or block.is_static:
+ break
+
+ for sym in block:
+ if sym.is_argument:
+ continue;
+
+ self.write_symbol (stream, sym, block)
+ stream.write ('\n')
+
+ def print_frame_args (self, stream, func):
+
+ try:
+ block = self.frame.block()
+ except RuntimeError:
+ block = None
+
+ while block != None:
+ if block.function != None:
+ break
+ block = block.superblock
+
+ first = True
+ for sym in block:
+ if not sym.is_argument:
+ continue;
+
+ if not first:
+ stream.write (", ")
+
+ self.write_symbol (stream, sym, block)
+ first = False
+
+ # FIXME: this should probably just be a method on gdb.Frame.
+ # But then we need stream wrappers.
+ def describe (self, stream, full):
+ if self.type () == gdb.DUMMY_FRAME:
+ stream.write (" <function called from gdb>\n")
+ elif self.type () == gdb.SIGTRAMP_FRAME:
+ stream.write (" <signal handler called>\n")
+ else:
+ sal = self.find_sal ()
+ pc = self.pc ()
+ name = self.name ()
+ if not name:
+ name = "??"
+ if pc != sal.pc or not sal.symtab:
+ stream.write (" 0x%08x in" % pc)
+ stream.write (" " + name + " (")
+
+ func = self.function ()
+ self.print_frame_args (stream, func)
+
+ stream.write (")")
+
+ if sal.symtab and sal.symtab.filename:
+ stream.write (" at " + sal.symtab.filename)
+ stream.write (":" + str (sal.line))
+
+ if not self.name () or (not sal.symtab or not sal.symtab.filename):
+ lib = gdb.solib_name (pc)
+ if lib:
+ stream.write (" from " + lib)
+
+ stream.write ("\n")
+
+ if full:
+ self.print_frame_locals (stream, func)
+
+ def __getattr__ (self, name):
+ return getattr (self.frame, name)
Index: gdb-7.12.50.20170207/gdb/python/lib/gdb/backtrace.py
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ gdb-7.12.50.20170207/gdb/python/lib/gdb/backtrace.py 2017-02-26 21:10:31.419894983 +0100
@@ -0,0 +1,42 @@
+# Filtering backtrace.
+
+# Copyright (C) 2008, 2011 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/>.
+
+import gdb
+import itertools
+
+# Our only exports.
+__all__ = ['push_frame_filter', 'create_frame_filter']
+
+old_frame_filter = None
+
+def push_frame_filter (constructor):
+ """Register a new backtrace filter class with the 'backtrace' command.
+The filter will be passed an iterator as an argument. The iterator
+will return gdb.Frame-like objects. The filter should in turn act as
+an iterator returning such objects."""
+ global old_frame_filter
+ if old_frame_filter == None:
+ old_frame_filter = constructor
+ else:
+ old_frame_filter = lambda iterator, filter = frame_filter: constructor (filter(iterator))
+
+def create_frame_filter (iter):
+ global old_frame_filter
+ if old_frame_filter is None:
+ return iter
+ return old_frame_filter (iter)
+
Index: gdb-7.12.50.20170207/gdb/python/lib/gdb/command/backtrace.py
===================================================================
--- /dev/null 1970-01-01 00:00:00.000000000 +0000
+++ gdb-7.12.50.20170207/gdb/python/lib/gdb/command/backtrace.py 2017-02-26 21:10:31.419894983 +0100
@@ -0,0 +1,106 @@
+# New backtrace command.
+
+# Copyright (C) 2008, 2009, 2011 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/>.
+
+import gdb
+import gdb.backtrace
+import itertools
+from gdb.FrameIterator import FrameIterator
+from gdb.FrameWrapper import FrameWrapper
+import sys
+
+class ReverseBacktraceParameter (gdb.Parameter):
+ """The new-backtrace command can show backtraces in 'reverse' order.
+This means that the innermost frame will be printed last.
+Note that reverse backtraces are more expensive to compute."""
+
+ set_doc = "Enable or disable reverse backtraces."
+ show_doc = "Show whether backtraces will be printed in reverse order."
+
+ def __init__(self):
+ gdb.Parameter.__init__ (self, "reverse-backtrace",
+ gdb.COMMAND_STACK, gdb.PARAM_BOOLEAN)
+ # Default to compatibility with gdb.
+ self.value = False
+
+class FilteringBacktrace (gdb.Command):
+ """Print backtrace of all stack frames, or innermost COUNT frames.
+With a negative argument, print outermost -COUNT frames.
+Use of the 'full' qualifier also prints the values of the local variables.
+Use of the 'raw' qualifier avoids any filtering by loadable modules.
+"""
+
+ def __init__ (self):
+ # FIXME: this is not working quite well enough to replace
+ # "backtrace" yet.
+ gdb.Command.__init__ (self, "new-backtrace", gdb.COMMAND_STACK)
+ self.reverse = ReverseBacktraceParameter()
+
+ def reverse_iter (self, iter):
+ result = []
+ for item in iter:
+ result.append (item)
+ result.reverse()
+ return result
+
+ def final_n (self, iter, x):
+ result = []
+ for item in iter:
+ result.append (item)
+ return result[x:]
+
+ def invoke (self, arg, from_tty):
+ i = 0
+ count = 0
+ filter = True
+ full = False
+
+ for word in arg.split (" "):
+ if word == '':
+ continue
+ elif word == 'raw':
+ filter = False
+ elif word == 'full':
+ full = True
+ else:
+ count = int (word)
+
+ # FIXME: provide option to start at selected frame
+ # However, should still number as if starting from newest
+ newest_frame = gdb.newest_frame()
+ iter = itertools.imap (FrameWrapper,
+ FrameIterator (newest_frame))
+ if filter:
+ iter = gdb.backtrace.create_frame_filter (iter)
+
+ # Now wrap in an iterator that numbers the frames.
+ iter = itertools.izip (itertools.count (0), iter)
+
+ # Reverse if the user wanted that.
+ if self.reverse.value:
+ iter = self.reverse_iter (iter)
+
+ # Extract sub-range user wants.
+ if count < 0:
+ iter = self.final_n (iter, count)
+ elif count > 0:
+ iter = itertools.islice (iter, 0, count)
+
+ for pair in iter:
+ sys.stdout.write ("#%-2d" % pair[0])
+ pair[1].describe (sys.stdout, full)
+
+FilteringBacktrace()