| //===---------------------------------------------------------------------===// |
| // General notes |
| //===---------------------------------------------------------------------===// |
| |
| VMKit is the composition of three libraries: |
| 1) MVM: mostly a garbage collector |
| 2) JnJVM: a Java Virtual Machine implemented with MVM and LLVM |
| 3) N3: a CLI implementation with MVM and LLVM |
| |
| JnJVM and N3 work on Linux/x86 (note that you may have to disable SSE on some |
| architecture), and mostly work on Linux/PPC (there are some errors with |
| floating points). Portage to Darwin has been done some time ago, so it should |
| not be too hard. |
| |
| JnJVM and N3 use GCC's unwinding library (libgcc_s.so). |
| |
| There are mainly two options in the ./configure script |
| --with-gnu-classpath-local-prefix: the local build of GNU classpath |
| --with-pnet-local-prefix: the local build of PNET |
| --with-llvm: the local build of LLVM |
| --with-gc: user either boehm or single-mmap |
| |
| Running make on the root tree will produce three executables: |
| 1) lib/Mvm/main: a command line tool to load virtual machines dynamically |
| 2) lib/JnJVM/main: running the JnJVM like any other JVM |
| 3) lib/N3/main: running N3 like CLR |
| |
| JnJVM and N3 have their own README notes. |
| |
| |
| //===---------------------------------------------------------------------===// |
| // Target specific LLVM patches (not required) |
| //===---------------------------------------------------------------------===// |
| |
| If you experience problems, you can apply the patches for your corresponding |
| arch. I'd be interested to get some info on your specific problem if the |
| patch fixes it. |
| |
| Patch for PowerPC: |
| - Bugfix for handling some external symbols (FIXME: does this still happen?) |
| - Thread safety when doing native code patching (TODO: submit to llvm-dev) |
| - CFI instructions for callbacks (TODO: find a correct macro to enable this) |
| - Emit a hand-made frame table for stubs (TODO: submit to llvm-dev) |
| |
| Patch for X86 |
| - Disable SSE (It can sigsegv on some x86 archs. Having test cases would be |
| nice) |
| - Enable CFI instructions for callbacks (TODO: find a correct macro to enable |
| by default) |
| |
| |
| //===---------------------------------------------------------------------===// |
| // TODOs |
| //===---------------------------------------------------------------------===// |
| |
| - A compiler/system dependency interface |
| - A better autoconf support |
| - Remove old, historical references and files |
| - Currently old object are allocated by MVM'GC. Make some classes |
| hand-allocated. |
| - Port to Darwin |
| - Improve exception handling performance: it's currently ugly and inefficient |
| |
| //===---------------------------------------------------------------------===// |
| // Disclaimer |
| //===---------------------------------------------------------------------===// |
| |
| JnJVM, N3 and MVM were developed with "having functional virtual machines as |
| quick as possible" in mind. The usage of mixed C/C++ and the absence of clean |
| interfaces, is due to the initial developers lazyness. But now that the VMs |
| run, things should go better. |
| |
