So that they appear on the output in the same order as they
come from the original debugging info.
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
And make the dwarves use it, so that we can remove duplicate strings in
a multi-CU file (vmlinux anyone?) and have it ready for insertion in a
compressed DWARF format with just the types, or better, CTF or some new
compressed debugging info format.
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
While pahole allows you to exclude classes with a specified prefix (using
--exclude), it doesn't appear to be able to do the opposite - only show classes
with a specific prefix. I found I needed this for my own use of it, so here is
a patch to add this functionality.
Signed-off-by: Dave Rigby <davidr@transitive.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
For correctly created and completely parsed debugging information the type will
always be found, but as we still need to parse more tags and expecting
debugging information to be always correctly built is not sane... sprinkle some
asserts.
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This is trying to get CTF friendly, where bitfields are not stored in the
equivalent to the DW_TAG_member dwarf TAG, but on "base types" with bit sizes
different than the real in the DWARF sense, base types (char, long, etc).
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This will print which object files have a struct definition, i.e. not just a
forward declaration.
There are many cases in the Linux kernel where just a fwd decl would suffice or outright
unneeded includes that end up bloating the DWARF sessions and consequently making everybody
suffer with humongous kernel-debuginfo packages.
More automation is needed here, this time something like sparse seems to be
needed to check what is that a header file "provides" and what is that the C
files "requires", doing some depsolving to discover unneeded Requires, i.e.
include directives and some that are required but are only satisfied
indirectly, which is a recipe for problems down the line.
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Found in at least a file (tcp_ipv6.c in the Linux kernel) built with gcc
version 4.3.0 20080130 (Red Hat 4.3.0-0.7).
Which seems to be in violation with DWARF3, but better be defensive and handle
that.
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
To find members that are pointers to the specified class:
[acme@tab pahole]$ pahole -f sock /usr/lib/debug/lib/modules/2.6.23.1-49.fc8/vmlinux
tcp_iter_state: syn_wait_sk
ip_ra_chain: sk
netlink_set_err_data: exclude_sk
netlink_broadcast_data: exclude_sk
cn_dev: nls
cn_callback_entry: nls
cn_queue_dev: nls
sk_security_struct: sk
unix_sock: peer
unix_sock: other
request_sock: sk
mqueue_inode_info: notify_sock
sock_iocb: sk
socket: sk
sk_buff: sk
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
So that we can expand pointer types, useful for ABI signature checking. And to
fully browse a type, when using --expand_types is also of interest.
I have yet to disable printing the offsets when expanding pointers, where the
information is not useful at all, for now just ignore it, it gets back to a
sane state in the next field, after the pointer type expansion.
Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
For now it just suppresses the struct statistics at the end of the output, but
will also suppress the comments about holes.
Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
To indicate wheter the semicolon should be supressed. Useful for
prototype/function emission, etc.
Also move the struct stats to be inside its body, to simplify tag__fprintf,
that now looks at conf.no_semicolon after calling the tag type specific
__fprintf method.
Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
So that tools can specify if they are interested in printing just the members
that use space in the class layout (DW_TAG_inheritance, DW_TAG_member) and not
things like constructors, private type definitions, etc.
Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
C++ uses this, and to cache the result of the lookup at type__name time we need
to pass the cu to class__name and type__name. Big fallout because of that :-\
But now the output is mucho embelished by the humongous strings representing
C++ templates.
Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Using it in the --dwarf_offset/-O new pahole command line option, useful in
debugging. Prints the tag in the dwarf offset supplied.
Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
For now its just the direct ancestor of struct type. But it will exists by
itself, to represent the DW_TAG_namespace DWARF tag, that is how the C++
'namespace' (and other languages too, heck, I'd love to get my hands on a
binary with DWARF info built from, say, ADA source code, objectiveC... COBOL!
:-P).
Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
This is in preparation for the introduction of struct namespace, that will be
struct type ancestor.
Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
For now only affects the --contains output.
Example showing the structs that include struct list_head in a linux kernel module:
[acme@filo pahole]$ pahole --recursive --contains list_head examples/ipv6.ko.debug.x86-64
inet_protosw
proto
sock_iocb
key_type
msg_queue
msg_msg
nf_hook_ops
softnet_data
net_device
softnet_data
dma_device
dma_client
dma_chan
class_device
net_device
softnet_data
dma_chan
class
klist_node
device_driver
device
klist
device_driver
bus_type
device
file_system_type
nfs_lock_info
file_lock
block_device
address_space
inode
dquot
mem_dqinfo
super_block
inode
signal_struct
page
kioctx
file
kiocb
work_struct
delayed_work
kioctx
timer_list
ifmcaddr6
inet6_dev
inet6_ifaddr
neigh_table
neighbour
net_device
softnet_data
sock
inet_sock
delayed_work
kioctx
plist_head
task_struct
sigpending
signal_struct
task_struct
user_struct
device
dev_pm_info
device
mutex_waiter
mutex
seq_file
block_device
quota_info
super_block
dquot
super_block
inode
zone
per_cpu_pages
free_area
kset
bus_type
subsystem
class
bus_type
__wait_queue_head
__wait_queue
rw_semaphore
quota_info
super_block
super_block
inode
key
blocking_notifier_head
bus_type
subsystem
class
bus_type
mm_struct
dentry
vm_area_struct
kobject
class_device
net_device
softnet_data
dma_chan
device_driver
module_kobject
module
device
kset
bus_type
subsystem
class
bus_type
lock_class
module
mm_struct
task_struct
Handling in multi-cu objects is not very precise, as the same struct has
different dwarf offsets (id) in each CU. A mitigation for this problem will be
provided with the --cu_list and --cu_name upcoming options, where one will be
able to get a list of the object files in a, for instance, linux kernel .ko
module and also to specify a cu name to be the only to be considered when
processing multi-cu files (again, such as .ko linux kernel modules).
This ends up being also useful to generate a reverse class hierarchy :-)
Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
First user is pahole, that now has a --contains CLASS_NAME option, that will
show which classes contains CLASS_NAME, i.e.:
struct foo {
struct bar baz;
int i;
};
on an object file called with '--contains bar' will produce:
foo
if --verbose is used it will tell the number of CLASS_NAME members, so, in the
above example:
foo:1
Next thing will be a --recursive flag, that will show all the structs that
contains CLASS_NAME and the ones that contains the ones which contains and...
:-)
Useful to evaluate the impact that increasing or decreasing the size of some
important struct will have on the whole project that uses the struct.
Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
By default, pahole will display the offsets of the inner struct members from
the top level struct. If the user wants to focus on some inner structs, just
call the tool with the -r option to use relative offset instead of the base
offset.
Signed-off-by: Eugene Teo <eteo@redhat.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Arnaldo Carvalho de Melo
Dave Rigby
Arnaldo Carvalho de Melo
Eugene Teo