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Annotation of 43BSDReno/pgrm/dbx/History, revision 1.1

1.1     ! root        1: Dbx is a descendant of pdx, a debugger that I wrote to work with
        !             2: Berkeley Pascal as my master's project at Berkeley.  Pdx was released
        !             3: in the fall of 1981.  While pdx was being completed, a version with
        !             4: different machine, process, and runtime modules was developed to run
        !             5: on VAX compiled code.
        !             6: 
        !             7: In the spring of '82, the use of the string table for storing type encodings
        !             8: was designed and the VAX C compiler was modified to generate the new
        !             9: symbol information.  In the fall of '82, the modifications to the C compiler
        !            10: and a new version of the debugger, by now named dbx, were installed locally
        !            11: at Berkeley.  In early '83, dbx was installed on the 4.1c release of
        !            12: Berkeley UNIX.
        !            13: 
        !            14: In the spring of '83, Alistair Fyfe, a graduate student at Berkeley,
        !            15: modified dbx and the f77 compiler to enable dbx to debug FORTRAN programs.
        !            16: During this time, dbx was also ported to the Sun.
        !            17: 
        !            18: In the fall of '83, dbx was released with 4.2.  During that winter and
        !            19: the spring of '84, dbx was extended to work with Modula-2 in conjunction
        !            20: with the development of the Modula-2 compiler at DEC Western Research Lab.
        !            21: In June of '84, a collection of updates reflected the current status
        !            22: of dbx, including bug fixes and support for Modula-2, was sent to net.sources.
        !            23: 
        !            24: Below are some short notes on versions that have been installed since then.
        !            25: 
        !            26:        Mark Linton
        !            27: 
        !            28: 
        !            29: 6/1    2.0     release to net.sources
        !            30: 
        !            31: internal releases
        !            32: 7/2    2.5     rewrote name resolution, particularly for procedure nesting
        !            33: 7/17   2.6     single stepping through certain kinds of loops,
        !            34:                tracing through code compiled for profiling
        !            35:                support for Pascal installed on the side but not tested
        !            36:                    (nor is the associated support in pc)
        !            37: 7/19   2.7     open arrays
        !            38: 7/31   2.8     print <proc>, qualified names in backtrace,
        !            39:                curevent to avoid some "missing trids",
        !            40: 8/1    2.9     increased maximum number of arguments from 100 to 1000,
        !            41:                increased maximum line size to 1024 to 10240
        !            42: 8/23   2.10    support for Pascal and test cases for modified pc,
        !            43:                code for -k (kernel debugging) added but not debugged,
        !            44:                qualified names in traces
        !            45:                no longer fatal to not link with -g -- assumes first global
        !            46:                    is equivalent to -lg
        !            47:                better resolution of externals
        !            48:                reports when a core image is being used
        !            49: 8/25   2.11    fixed some problems with Pascal, e.g., enumerations,
        !            50:                increased maximum number of functions from 1001 to 4001,
        !            51:                fixed a nasty bug for C (and elsewhere?) having to do
        !            52:                    with processing types for "known" global variables,
        !            53:                changed the syntax/semantics of "print x" where x is
        !            54:                    a function so that it no longer tries to call it --
        !            55:                    "print x()" must be used instead
        !            56:                added/fixed syntax for type renaming so that term's can
        !            57:                    be renamed
        !            58: 8/26   2.12    fixed problem with multiple imports (EXTREF's),
        !            59:                added dynamic name lookup if static lookup fails before picking
        !            60:                    at random
        !            61: 8/27   2.13    fixed problem in dynamic lookup that caused an infinite loop,
        !            62:                if it picks one at random it now prints a message specifying
        !            63:                    the fully qualified name of the symbol that was picked
        !            64: 8/27   2.15    first attack at fixing problem with type renames (loopholes)
        !            65: 9/16   2.16    major attempt to fix loopholes by revising node representation
        !            66:                    and command grammar -- basic need was to make more sense
        !            67:                    out of when to do indirection
        !            68:                changed identifier resolution in object and stabstring so
        !            69:                    that globals are no longer in top scope (since they could
        !            70:                    conflict with a module name)
        !            71: 9/18   2.17    another problem related to expressions having to do with
        !            72:                    handling pointers to arrays
        !            73:         ...
        !            74: 1/1    2.25    made more inroads into kernel debugging,
        !            75:                added macros (aliases with arguments), and settable variables
        !            76: 1/7    2.26    fixed bug where only mapped first address of block read,
        !            77:                    have to map each page (still wrong though)
        !            78: 1/13   2.27    fixed some user reported problems -- down in runtime
        !            79:                    didn't work correctly if "curframe" wasn't already set,
        !            80:                the process instruction cache had to be flushed when
        !            81:                    a process is killed (this caused a problem when an
        !            82:                    object file was remade)
        !            83: 1/14   2.28    fixed problem with mapping addresses under -k,
        !            84:                added -c option for command files other than .dbxinit
        !            85:                fixed occasional problem with testing for end of stack frames
        !            86:                    (symptom was infinite loop calling nextframe)
        !            87: 1/15   2.29    fixed problem with printing dynamic arrays inside aggregates
        !            88:                fixed type compatibility for builtin true and false

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