vds11

summary: add a custom microcode block optimization rule

description:

Installs a custom microcode block optimization rule, to transform:

goto L1 …

L1:
goto L2

into

goto L2

In other words we fix a goto target if it points to a chain of gotos. This improves the decompiler output in some cases.

level: advanced

Classes

`goto_optimizer_t`
`my_plugin_t`	Base class for all scripted plugins.

Functions

PLUGIN_ENTRY()

Module Contents

class vds11.goto_optimizer_t

Bases: ida_hexrays.optblock_t

func(blk)

Optimize a block. This function usually performs the optimizations that require analyzing the entire block and/or its neighbors. For example it can recognize patterns and perform conversions like: b0: b0: … … jnz x, 0, @b2 => jnz x, 0, @b2 b1: b1: add x, 0, y mov x, y … …

Parameters:: blk – Basic block to optimize as a whole.
Returns:: number of changes made to the block. See also mark_lists_dirty.

handle_goto_chain(blk)

class vds11.my_plugin_t

Bases: ida_idaapi.plugin_t

Base class for all scripted plugins.

flags = 16

wanted_name = 'Optimize goto chains (IDAPython)'

wanted_hotkey = ''

comment = 'Sample plugin11 for Hex-Rays decompiler'

help = ''

init()

term()

run(arg)

vds11.PLUGIN_ENTRY()