vds19
summary: add a custom microcode instruction optimization rule
- description:
Installs a custom microcode instruction optimization rule, to transform:
x | ~x
into
-1
To see this plugin in action please use be_ornot_be.idb
level: advanced
Classes
Base class for all scripted plugins. |
Functions
Module Contents
- class vds19.subinsn_optimizer_t(_mba: mba_t = None, _blk: mblock_t = None, _topins: minsn_t = None)
Bases:
ida_hexrays.minsn_visitor_t- cnt = 0
- visit_minsn()
- class vds19.sample_optimizer_t
Bases:
ida_hexrays.optinsn_t- func(blk, ins, optflags)
Optimize an instruction.
- Parameters:
blk – current basic block. maybe nullptr, which means that the instruction must be optimized without context
ins – instruction to optimize; it is always a top-level instruction. the callback may not delete the instruction but may convert it into nop (see mblock_t::make_nop). to optimize sub-instructions, visit them using minsn_visitor_t. sub-instructions may not be converted into nop but can be converted to “mov x,x”. for example: add x,0,x => mov x,x this callback may change other instructions in the block, but should do this with care, e.g. to no break the propagation algorithm if called with OPTI_NO_LDXOPT.
optflags – combination of optimization flags bits
- Returns:
number of changes made to the instruction. if after this call the instruction’s use/def lists have changed, you must mark the block level lists as dirty (see mark_lists_dirty)
- class vds19.my_plugin_t
Bases:
ida_idaapi.plugin_tBase class for all scripted plugins.
- flags = 16
- wanted_name = 'optimize x|~x'
- wanted_hotkey = ''
- comment = ''
- help = ''
- init()
- term()
- run(arg)
- vds19.PLUGIN_ENTRY()