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()