pccts1.txt

本工具提供一个词法分析器和语法分析器的集成开发环境

PCCTS(1)                PCCTS Manual Pages               PCCTS(1)


NNAAMMEE
       PCCTS - The Purdue Compiler Construction Tool Set

DDEESSCCRRIIPPTTIIOONN
       PCCTS is a set of public domain software tools designed to
       facilitate  the  implementation  of  compilers  and  other
       translation systems.  These tools currently include _a_n_t_l_r,
       _d_l_g and support code.  In many ways, PCCTS is similar to a
       highly integrated version of YACC [Joh78] and LEX [Les75];
       where _a_n_t_l_r (ANother Tool for Language Recognition) corre-
       sponds to YACC and _d_l_g (DFA-based Lexical analyzer Genera-
       tor) functions like LEX.  However, PCCTS  has  many  addi-
       tional  features  which  make it easier to use for a wider
       range of translation problems.

       PCCTS grammars contain specifications for lexical and syn-
       tactic  analysis, intermediate-form construction and error
       reporting.  Rules may employ  Extended  Backus  Naur  Form
       (EBNF)  grammar  constructs  and  may  define  parameters,
       return values and local variables.  Languages described in
       PCCTS  are recognized via Strong LL(k) parsers constructed
       in pure, human-readable, C code.  As  a  result,  standard
       debugging  tools  can  be  used  to  trace and debug PCCTS
       parsers.  Breakpoints can be set so that parser  execution
       stops  before  or after grammar fragments of interest have
       been recognized.

       PCCTS grammars may contain predicates which allow  parsing
       to  be  a  function of semantics as well as syntax -- con-
       text-sensitive grammars.  Backtracking can also be  speci-
       fied  to  recognized non-LL(k) and non-LALR(k) constructs.
       In addition, PCCTS  supports  intermediate-form  (such  as
       expression-trees)  construction  via  a flexible Abstract-
       Syntax Tree (AST) mechanism which allows trees to be built
       explicitly  or automatically.  The user explicitly creates
       trees via a LISP-like  tree  constructor  or  directs  the
       automatic  tree  construction  facility via simple grammar
       directives.  AST nodes are user-defined and are  generally
       a  function  of attributes.  A default transformation from
       attributes ($$-variables) to AST nodes  can  be  specified.
       Alternatively,  each  tree  node can be defined explicitly
       via an AST node constructor.

IINNSSTTAALLLLAATTIIOONN
       PCCTS includes a number of different programs and examples
       in  the  software  release  package--most of which like to
       live in their own directories.  The  install  script  will
       build a standard hierarchy.  The PCCTS executables (_a_n_t_l_r,
       _d_l_g) may be  placed  anywhere  the  user  wishes  but  the
       install  script  places  them in the bin directory created
       during installation.

       To begin installation, place the pccts.tar file  into  the
       directory  where  you  want to place a pccts subdirectory.



PCCTS                       April 1994                          1





PCCTS(1)                PCCTS Manual Pages               PCCTS(1)


       Untar the file with

            tar xvf pccts.tar

       and cd into it.  To install PCCTS, simply type

            make

       which will build the standard  PCCTS  directory  hierarchy
       (under the directory where you ran the install script) and
       build executable versions of antlr and dlg.

       The examples associated with PCCTS have makefile variables
       called  AANNTTLLRR,  DDLLGG  etc... which must be set according to
       your personal directory structure before  _m_a_k_e'ing.   Some
       variables point to the PCCTS executables if the PPAATTHH envi-
       ronment variable does  not  include  your  bbiinn  directory.
       Also,  there  are  variables  that  point to PCCTS include
       directories and must be changed if you  deviate  from  the
       standard  PCCTS installation hierarchy.  _a_n_t_l_r and _d_l_g can
       be built without executable versions of themselves  (_a_n_t_l_r
       and _d_l_g are written in themselves).

GGEETTTTIINNGG SSTTAARRTTEEDD
       A  C  program  called  ggeennmmkk..cc  is  available  in the ssuupp--
       ppoorrtt//ggeennmmkk directory of the PCCTS release.

SSEEEE AALLSSOO
       dlg(1), antlr(1)




























PCCTS                       April 1994                          2