Fernflower readme markdown
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1. About the decompiler
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## About fernflower
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Fernflower is the first actually working analytical decompiler for Java and
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probably for a high-level programming language in general. Naturally it is still
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@@ -6,12 +6,11 @@ under development, please send your bug reports and improvement suggestions at
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fernflower.decompiler@gmail.com
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2. License
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## Licence
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http://www.apache.org/licenses/LICENSE-2.0
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Fernflower is licenced under the Apache Licence Version 2.0. It can be found here: http://www.apache.org/licenses/LICENSE-2.0
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3. Running from the command line
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## Running from command line
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java -jar fernflower.jar [-<option>=<value>]* [<source>]+ <destination>
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<destination>: destination directory
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<option>,<value>: command line option with the corresponding value, see 4.
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Examples:
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### Examples
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java -jar fernflower.jar -hes=0 -hdc=0 c:\Temp\binary\ -e=c:\Java\rt.jar c:\Temp\source\
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java -jar fernflower.jar -dgs=1 c:\Temp\binary\library.jar c:\Temp\binary\Boot.class c:\Temp\source\
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4. Command line options
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## Command line options
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With the exception of mpm and urc the value of 1 means the option is activated, 0 - deactivated. Default
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value, if any, is given between parentheses.
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Typically, the following options will be changed by user, if any: hes, hdc, dgs, mpm, ren, urc
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The rest of options can be left as they are: they are aimed at professional reverse engineers.
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rbr (1): hide bridge methods
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rsy (0): hide synthetic class members
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din (1): decompile inner classes
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dc4 (1): collapse 1.4 class references
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das (1): decompile assertions
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hes (1): hide empty super invocation
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hdc (1): hide empty default constructor
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dgs (0): decompile generic signatures
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ner (1): assume return not throwing exceptions
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den (1): decompile enumerations
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rgn (1): remove getClass() invocation, when it is part of a qualified new statement
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lit (0): output numeric literals "as-is"
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asc (0): encode non-ASCII characters in string and character literals as Unicode escapes
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bto (1): interpret int 1 as boolean true (workaround to a compiler bug)
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nns (1): allow for not set synthetic attribute (workaround to a compiler bug)
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uto (1): consider nameless types as java.lang.Object (workaround to a compiler architecture flaw)
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udv (1): reconstruct variable names from debug information, if present
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rer (1): remove empty exception ranges
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fdi (1): de-inline finally structures
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mpm (0): maximum allowed processing time per decompiled method, in seconds. 0 means no upper limit
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ren (0): rename ambiguous (resp. obfuscated) classes and class elements
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urc : full name of user-supplied class implementing IIdentifierRenamer. It is used to determine which class identifiers
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- rbr (1): hide bridge methods
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- rsy (0): hide synthetic class members
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- din (1): decompile inner classes
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- dc4 (1): collapse 1.4 class references
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- das (1): decompile assertions
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- hes (1): hide empty super invocation
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- hdc (1): hide empty default constructor
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- dgs (0): decompile generic signatures
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- ner (1): assume return not throwing exceptions
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- den (1): decompile enumerations
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- rgn (1): remove getClass() invocation, when it is part of a qualified new statement
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- lit (0): output numeric literals "as-is"
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- asc (0): encode non-ASCII characters in string and character literals as Unicode escapes
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- bto (1): interpret int 1 as boolean true (workaround to a compiler bug)
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- nns (1): allow for not set synthetic attribute (workaround to a compiler bug)
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- uto (1): consider nameless types as java.lang.Object (workaround to a compiler architecture flaw)
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- udv (1): reconstruct variable names from debug information, if present
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- rer (1): remove empty exception ranges
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- fdi (1): de-inline finally structures
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- mpm (0): maximum allowed processing time per decompiled method, in seconds. 0 means no upper limit
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- ren (0): rename ambiguous (resp. obfuscated) classes and class elements
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- urc : full name of user-supplied class implementing IIdentifierRenamer. It is used to determine which class identifiers
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should be renamed and provides new identifier names. For more information see section 5
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inn (1): check for IntelliJ IDEA-specific @NotNull annotation and remove inserted code if found
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lac (0): decompile lambda expressions to anonymous classes
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nls (0): define new line character to be used for output. 0 - '\r\n' (Windows), 1 - '\n' (Unix), default is OS-dependent
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ind : indentation string (default is " " (3 spaces))
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- inn (1): check for IntelliJ IDEA-specific @NotNull annotation and remove inserted code if found
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- lac (0): decompile lambda expressions to anonymous classes
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- nls (0): define new line character to be used for output. 0 - '\r\n' (Windows), 1 - '\n' (Unix), default is OS-dependent
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- ind : indentation string (default is " " (3 spaces))
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The default logging level is INFO. This value can be overwritten by setting the option 'log' as follows:
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log (INFO): possible values TRACE, INFO, WARN, ERROR
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5. Renaming identifiers
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## Renaming identifiers
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Some obfuscators give classes and their member elements short, meaningless and above all ambiguous names. Recompiling of such
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code leads to a great number of conflicts. Therefore it is advisable to let the decompiler rename elements in its turn,
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