C++ to Java Translator

Main source

This project aims to convert C++ code to high level Java source code. Where that is not possible, a TODO should appear in the generated source code.

Status

The project is about three quarters of the way to an initial release. The below items will not be handled by the initial release:

• goto statement
• untyped malloc
• template code generation (generics to be used instead).
• C++/C std lib
• order of operation differences
• platform dependent/undefined behavior
• unions
• dynamic cast and other RTTI features
• multiple inheritance
• C++11 features
• overloaded operator new and operator delete memory management

Everything else should work with the initial release.

Example Code

The following lines give an indication of what generated code using pointers looks like.

 // Test plain assignment...
 f[4] = 111;
 *f = 112;
 (((*(f + 2)))) = 113;
 *(f--) = 114;

 // Test compound assignment...
 f[1] *= 3;
 (*f) += 4;

 // Test pointer comparison
 f < &f[1];
 &f[0] == f;

 // Test addressof ptr
 &f;

 f.ptrOffset(4).set(111);
 f.set(112);
 ((((f.ptrOffset(+2))))).set(113);
 (f.ptrPostDec()).set(114);

 f.ptrOffset(1).set(f.ptrOffset(1).get() * 3);
 (f).set((f.get()) + 4);

 f.ptrCompare() < f.ptrOffset(1).ptrCompare();
 f.ptrOffset(0).ptrCompare() == f.ptrCompare();

 f.ptrAddressOf();

Required JARs

This fork will build with Maven. Eclipse CDT is not in Maven central, or any repository I could find, but for your convenience, private copies of certain JARS are shipped in the lib/ directory:

• org.eclipse.cdt.core_5.4.1.201209170703.jar
• org.eclipse.equinox.common_3.6.100.v20120522-1841.jar
• com.ibm.icu_50.1.1.v201304230130.jar (I needed it at run-time once to fix a logging error)

Please note these are from a separate project with separate licenses.

Historical required JARs:

These are the JAR files I use to get this code to run. They are from Eclipse Juno (4.2.x) and CDT 8.1.1 for Eclipse Juno. Additionally, jOOR is required by the runtime template handling code.

• Eclipse downloads
• CDT downloads
• jOOR at Github
• org.eclipse.cdt.core_5.4.1.201209170703.jar
• org.eclipse.equinox.common_3.6.100.v20120522-1841.jar
• joor-0.9.3.jar

License

This project is licensed under the Apache license. The CDT walking code is based loosely on code I found (and lost the url) on the web (also licensed under the Apache license).

TODO

This is an incomplete and fluid list of items that need doing before the initial release.

• General
  • Lots more assertions
  • Destructor calls on static duration objects
  • Cast operators other than C style cast should not resolve overloaded operator cast
  • Basic type classes other than MInteger
  • Global variables
  • Templates
  • Should be able to take the address of an enumerator
  • Putting in comments/defines from original
  • A lot of work on multi dimension arrays.
  • cleanup cpptojavatype method.
  • function pointers.
  • typed malloc.
  • testing cleanup.
  • making logger useful.
  • relacing deprecated methods.
  • make lists.
  • correct names (camel case, capitalized classes etc.)
  • Varargs.
  • Bracketed expressions
  • Special case this pointer and void pointer.
  • exact bit position for bitfield.
• First pass
  • Recursively evaluate templates and generate expanded cpp code.
  • Generate implicit special methods and output cpp code.
  • Record if a basic variable(int, bool, etc) has its address taken so we can skip objectifying it if it does not.