Add pivars command to FBClassDump.py

[longv2go]

pivars command call the class_copyIvarList to get all ivars of an Class and print them out. It would show the offset, type, name and value if need.

(lldb) pivars -r -n child
NSObject:
    [0x0] Class isa

father:
    [0x4] NSString * father_var
    [0x8] NSString * faterh_var2

child:
    [0xc] {teststr="a"i"b"l} straaa
    [0x14] NSString * c_var1
    [0x18] NSString * _c_var2

[kastiglione]

Thanks, and sorry for the late reply. This looks good, but I'm also wondering if we should consolidate pinternals and pivar? Should we discuss that now, or leave that for another time.

[longv2go]

@kastiglione I notice that too. pinternals can not show the ivar`s offset, so I wrote this command. Sometimes I need the offset to inspect the object`s memory layout, and pivar need the ivar`s name, no name no working.

[kastiglione]

Related, a command I came across last week is:

language objc class-table dump -v <regular-expression>

This prints ivars and their offsets, but it also prints methods too, which adds noise if you just want structure information.

[longv2go]

@kastiglione I think we should to merge the pivars, pmethods, pproperties to one command.

class-dump <options> <arg>

if the arg is an instance of some class, it can show the ivar`s value of that instance. But there is more work to decode the struct infomation.

[kastiglione]

@longv2go I'm following up on outstanding pull requests. Sorry for the long silence. Note that since this time, a -a flag was added to pinternals which calls the debugging helper _ivarDescription.