129 lines
3.6 KiB
Python
129 lines
3.6 KiB
Python
""" Forcibly change the width of an lvar.
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Useful for making an lvar smaller (which Hex-Rays does not let you do apparently)
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Tags (for search engines):
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IDA Pro Hex-Rays make stack variable smaller force variable size decrease width delete variable split up break up variable into smaller
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"""
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import idautils
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import idaapi
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import idc
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import ida_hexrays
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import traceback
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force_width_actname = "forcelvarwidth:forcewidth"
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class force_width_action_handler_t(idaapi.action_handler_t):
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def __init__(self, callback_info):
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idaapi.action_handler_t.__init__(self)
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self.callback_info = callback_info
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def activate(self, ctx):
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vdui = idaapi.get_widget_vdui(ctx.widget)
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self.callback_info.gui_action_callback(vdui)
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return 1
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def update(self, ctx):
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return idaapi.AST_ENABLE_FOR_WIDGET if \
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ctx.widget_type == idaapi.BWN_PSEUDOCODE else \
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idaapi.AST_DISABLE_FOR_WIDGET
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class hexrays_callback_info(object):
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def __init__(self):
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self.vu = None
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return
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def load(self):
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return
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def save(self):
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return
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def do_force_width(self, cfunc, insn):
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if insn.opname != 'if':
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return False
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cif = insn.details
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if not cif.ithen or not cif.ielse:
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return False
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idaapi.qswap(cif.ithen, cif.ielse)
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cond = idaapi.cexpr_t(cif.expr)
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notcond = idaapi.lnot(cond)
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cif.expr.swap(notcond)
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return True
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def gui_action_callback(self, vu):
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cfunc = vu.cfunc.__deref__()
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if not vu.get_current_item(idaapi.USE_KEYBOARD):
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print "Force lvar width: you don't have anything selected"
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return False
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badlv = vu.item.get_lvar()
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if not badlv:
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print "Force lvar width: you don't have an lvar selected"
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return False
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new_width = idc.AskLong(badlv.width, "Enter the new width for " + badlv.name)
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if new_width == None: # cancelled
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print "Force lvar width: operation cancelled"
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return False
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if new_width <= 0:
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print "Force lvar width: not allowed. Non-positive width will crash IDA"
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return False
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badlv.set_width(new_width)
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print 'Set the type in IDA (Y) for it to apply'
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idaapi.process_ui_action('hx:SetType')
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# vu.refresh_ctext()
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print 'Force lvar width: OK.'
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return True
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def event_callback(self, event, *args):
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if event == idaapi.hxe_populating_popup:
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widget, phandle, vu = args
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res = idaapi.attach_action_to_popup(vu.ct, None, force_width_actname)
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return 0
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class ForceLvarWidth(idaapi.plugin_t):
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flags = idaapi.PLUGIN_PROC | idaapi.PLUGIN_HIDE
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wanted_hotkey = "Shift-W"
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comment = "Force lvar width plugin for Hex-Rays decompiler"
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help = "There is no one to help you now"
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wanted_name = "Hex-Rays lvar width forcer"
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def init(self):
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if idaapi.init_hexrays_plugin():
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i = hexrays_callback_info()
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idaapi.register_action(
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idaapi.action_desc_t(
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force_width_actname,
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"Force lvar width",
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force_width_action_handler_t(i),
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"Shift-W"))
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idaapi.install_hexrays_callback(i.event_callback)
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print 'Hex-Rays lvar width forcer by ecx86 loaded!'
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else:
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print 'Force lvar width: Hexrays is not available.'
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def term(self):
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pass
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def run(self, arg):
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pass
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def PLUGIN_ENTRY():
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return ForceLvarWidth()
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