Req.  API   Stub  Subsys  Compl  Compr   x86    x86   x86   ppc   ppc 
                       spec  Des.  Func  Stubs   Tests  Tests  linux  win32  osx  linux  osx  sparc
---------------------------------------------------------------------------------------------------
Common vtable format         
Calling conventions     jg    jg    jg    jg                    jg     jg     jg   jg    jg    jg
Internal data types
Opcode functions
Assembly language             jg    jg    jg                    jg     jg     jg   jg    jg    jg
Index aggregate PMCs           
Garbage collection            jg    jg    jg
Embedding
Extension system
Bytecode                      jg    jg    jg                    jg     jg     jg   jg    jg    jg
Big numbers
Objects and classes
NCI
Basic PMC types
Security infrastr.
PIR                     jg    jg    jg    jg                    jg     jg     jg   jg    jg    jg
Lexical variables       jg    jg    jg    jg                    jg     jg     jg   jg    jg    jg
Namespaces              jg    jg    jg    jg                    jg     jg     jg   jg    jg    jg
IO
Exceptions              jg
Threads                                                                *1       
STM                     jg    jg    jg    jg                           *1
Configure               jg                                      jg     jg     jg   jg    jg    jg
Build                         jg                                jg     jg     jg   jg    jg    jg
Test                    jg    jg    jg    jg                    jg     jg     jg   jg    jg    jg


Notes:
   1.  Currently broken (jg)


Column descriptions:
  Subsys stubs:  incomplete implementations, often in advance of not-complete specs