|
|
|
@ -1,36 +1,36 @@ |
|
|
|
|
## About fernflower |
|
|
|
|
### About Fernflower |
|
|
|
|
|
|
|
|
|
Fernflower is the first actually working analytical decompiler for Java and |
|
|
|
|
probably for a high-level programming language in general. Naturally it is still |
|
|
|
|
under development, please send your bug reports and improvement suggestions at |
|
|
|
|
fernflower.decompiler@gmail.com |
|
|
|
|
|
|
|
|
|
### Licence |
|
|
|
|
|
|
|
|
|
## Licence |
|
|
|
|
Fernflower is licenced under the [Apache Licence Version 2.0](http://www.apache.org/licenses/LICENSE-2.0). |
|
|
|
|
|
|
|
|
|
Fernflower is licenced under the Apache Licence Version 2.0. It can be found here: http://www.apache.org/licenses/LICENSE-2.0 |
|
|
|
|
### Running from command line |
|
|
|
|
|
|
|
|
|
## Running from command line |
|
|
|
|
|
|
|
|
|
java -jar fernflower.jar [-<option>=<value>]* [<source>]+ <destination> |
|
|
|
|
`java -jar fernflower.jar [-<option>=<value>]* [<source>]+ <destination>` |
|
|
|
|
|
|
|
|
|
\* means 0 or more times\ |
|
|
|
|
\+ means 1 or more times |
|
|
|
|
|
|
|
|
|
<source>: file or directory with files to be decompiled. Directories are recursively scanned. Allowed file extensions are class, zip and jar. |
|
|
|
|
\<source>: file or directory with files to be decompiled. Directories are recursively scanned. Allowed file extensions are class, zip and jar. |
|
|
|
|
Sources prefixed with -e= mean "library" files that won't be decompiled, but taken into account when analysing relationships between |
|
|
|
|
classes or methods. Especially renaming of identifiers (s. option 'ren') can benefit from information about external classes. |
|
|
|
|
<destination>: destination directory |
|
|
|
|
<option>,<value>: command line option with the corresponding value, see 4. |
|
|
|
|
|
|
|
|
|
### Examples |
|
|
|
|
\<destination>: destination directory |
|
|
|
|
|
|
|
|
|
\<option>, \<value>: a command-line option with the corresponding value (see "Command-line options" below). |
|
|
|
|
|
|
|
|
|
java -jar fernflower.jar -hes=0 -hdc=0 c:\Temp\binary\ -e=c:\Java\rt.jar c:\Temp\source\ |
|
|
|
|
##### Examples: |
|
|
|
|
|
|
|
|
|
java -jar fernflower.jar -dgs=1 c:\Temp\binary\library.jar c:\Temp\binary\Boot.class c:\Temp\source\ |
|
|
|
|
`java -jar fernflower.jar -hes=0 -hdc=0 c:\Temp\binary\ -e=c:\Java\rt.jar c:\Temp\source\` |
|
|
|
|
|
|
|
|
|
`java -jar fernflower.jar -dgs=1 c:\Temp\binary\library.jar c:\Temp\binary\Boot.class c:\Temp\source\` |
|
|
|
|
|
|
|
|
|
## Command line options |
|
|
|
|
### Command-line options |
|
|
|
|
|
|
|
|
|
With the exception of mpm and urc the value of 1 means the option is activated, 0 - deactivated. Default |
|
|
|
|
value, if any, is given between parentheses. |
|
|
|
@ -59,18 +59,15 @@ The rest of options can be left as they are: they are aimed at professional reve |
|
|
|
|
- fdi (1): de-inline finally structures |
|
|
|
|
- mpm (0): maximum allowed processing time per decompiled method, in seconds. 0 means no upper limit |
|
|
|
|
- ren (0): rename ambiguous (resp. obfuscated) classes and class elements |
|
|
|
|
- urc : full name of user-supplied class implementing IIdentifierRenamer. It is used to determine which class identifiers |
|
|
|
|
should be renamed and provides new identifier names. For more information see section 5 |
|
|
|
|
- urc: full name of user-supplied class implementing IIdentifierRenamer. It is used to determine which class identifiers |
|
|
|
|
should be renamed and provides new identifier names (see "Renaming identifiers") |
|
|
|
|
- inn (1): check for IntelliJ IDEA-specific @NotNull annotation and remove inserted code if found |
|
|
|
|
- lac (0): decompile lambda expressions to anonymous classes |
|
|
|
|
- nls (0): define new line character to be used for output. 0 - '\r\n' (Windows), 1 - '\n' (Unix), default is OS-dependent |
|
|
|
|
- ind : indentation string (default is " " (3 spaces)) |
|
|
|
|
|
|
|
|
|
The default logging level is INFO. This value can be overwritten by setting the option 'log' as follows: |
|
|
|
|
log (INFO): possible values TRACE, INFO, WARN, ERROR |
|
|
|
|
|
|
|
|
|
- ind: indentation string (default is 3 spaces) |
|
|
|
|
- log (INFO): a logging level, possible values are TRACE, INFO, WARN, ERROR |
|
|
|
|
|
|
|
|
|
## Renaming identifiers |
|
|
|
|
### Renaming identifiers |
|
|
|
|
|
|
|
|
|
Some obfuscators give classes and their member elements short, meaningless and above all ambiguous names. Recompiling of such |
|
|
|
|
code leads to a great number of conflicts. Therefore it is advisable to let the decompiler rename elements in its turn, |
|
|
|
@ -78,10 +75,10 @@ ensuring uniqueness of each identifier. |
|
|
|
|
|
|
|
|
|
Option 'ren' (i.e. -ren=1) activates renaming functionality. Default renaming strategy goes as follows: |
|
|
|
|
- rename an element if its name is a reserved word or is shorter than 3 characters |
|
|
|
|
- new names are built according to a simple pattern: (class|method|field)_<consecutive unique number> |
|
|
|
|
- new names are built according to a simple pattern: (class|method|field)_\<consecutive unique number> |
|
|
|
|
You can overwrite this rules by providing your own implementation of the 4 key methods invoked by the decompiler while renaming. Simply |
|
|
|
|
pass a class that implements org.jetbrains.java.decompiler.main.extern.IIdentifierRenamer in the option 'urc' |
|
|
|
|
(e.g. -urc=com.mypackage.MyRenamer) to Fernflower. The class must be available on the application classpath. |
|
|
|
|
(e.g. -urc=com.example.MyRenamer) to Fernflower. The class must be available on the application classpath. |
|
|
|
|
|
|
|
|
|
The meaning of each method should be clear from naming: toBeRenamed determine whether the element will be renamed, while the other three |
|
|
|
|
provide new names for classes, methods and fields respectively. |
|
|
|
|