workplan.txt

开放源码的编译器open watcom 1.6.0版的源代码

            WATCOM C++ work plan
            ====================
            
        
Mission statement:

To develop an optimizing ANSI C++ compiler for professional programmers.


Tactical decisions:

    - high quality implementation (predictable and robust)
    - large projects will be supported
    - 286/386 protected mode executables only; will produce code
      for all current platforms
    - full standard will be supported with possible absence of
      ANSI standard exception handling (catch,throw statements)
    - minimal class libraries will be shipped with the initial
      commercial offering


Implementation strategy:

    - reusing as much of the existing ANSI C compiler source
    - developing a basis for a new ANSI C compiler based on new
      technology developed for the ANSI C++ compiler (new ANSI C
      compiler will be phased in at a later time)
    - provide a high quality implementation that can diagnose
      portability problems related to syntax issues (language
      ambiguities)


            Work Assignments
            ================
            
Person  Work
======  ====
JR      declaration parsing
            - construct internal symbol table structure
        - inline function rewriting must be done
            - templates are a new concept

AS,JW   statement parsing
            - expression parsing and checking
            - steal majority of code from current C compiler
              for control flow statements
            - overloading algorithm needed
            - code sequences for temporary elimination
            - new intermediate code representation
            - rewriting of code generator interface
            - no changes needed to code generator except for support
          for separate modules and code thunks (JD will do this)
        - exception handling should be investigated

FC      compiler framework
            - rewrite of preprocessor/lexical analysis
            - options processor (unknown)
            - #pragma changes (unknown)

JW      run-time library
        - full ANSI C library will be available
        - C++ library will use ANSI C functions whenever possible
        - code generation libraries (startup, new, delete, etc.) must
          be developed
    
??  testing
        - C++ is a superset of C so we should be able to test
          the C++ compiler with the source code we have in-house
        - third party vendors of class libraries

BS      linker
            - unused method removal (unknown)
            - type-safe linkage (unknown)
            - single template definitions (unknown)

BS      debugger
            - class browser (unknown)
            - typing and ctor/dtor execution (unknown)

JS      documentation
            - User's Guide
            - Language Reference?
    
??  utilities
        - many of our object utilities cannot handle large names
          (e.g., WDISASM)
        - new utilities may have to be written for C++ development

    
Legend
======

FC  Fred Crigger
AS  Anthony Scian
JW  Jim Welch
JR  Jim Randall
JS  Jack Scheuler
BS  Brian Stecher
JD  John Dahms
??  Unknown