Welcome to ABC, the ANTLR-Based C front-end. ABC is a Java program for parsing and manipulating programs written in C and possibly some languages extending C, such as CIVL-C. It can be used to perform a number of tasks, including the following:

1. preprocess the source file(s)
2. parse the preprocessed source to form an Abstract Syntax Tree representation of a translation unit
3. analyze an AST to determine the type of every expression, the entity associated to every identifier, the scope of every node, and so on
4. merge multiple ASTs into one large AST
5. transform ASTs, by, for example, removing expressions with side-effects, renaming entities, pruning unreachable code, etc.

In addition, it provides a framework for developing your own analyses or transformations on ASTs.

There is a simple command-line interface for ABC (see

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ABC

), but most users will want to use ABC through its API. To use the API, it is helpful to have some understanding of the modular structure of ABC. The ABC source code is decomposed into modules, each with a well-defined interface and set of responsibilities. Some of these modules are decomposed further into sub-modules. The top-level modules are:

1. util
   1. responsibilities: simple general-purpose utility classes that do not use other parts of ABC
   2. uses: nothing
   3. interface: dev.civl.abc.util.IF
   4. entry point: none
2. config
   1. responsibilities: representation of configuration parameters for ABC
   2. uses: nothing
   3. interface: dev.civl.abc.config.IF
   4. entry point: Configurations
3. token
   1. responsibilities: representing tokens; keeping track of the origin and history of each token through macro expansion and inclusion; representing characters and strings
   2. uses: util
   3. interface: dev.civl.abc.token.IF
   4. entry point: Tokens
4. front
1. responsibilities: preprocessing and parsing a file to produce an ANTLR tree representation of a translation unit
2. uses: util, config, token
3. interface: dev.civl.abc.front.IF,
4. entry point:
5. submodules
   1. preproc
      1. responsibilities: preprocessing a file to generate a post-preprocessor token stream
      2. uses: util, config, token
      3. interface:
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         dev.civl.abc.front.c.preproc.IF

         ,
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         dev.civl.abc.front.fortran.preproc.IF

      4. entry point:
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         Preprocess

         ,
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         Preprocess

   2. parse
      1. responsibilities: parsing a token stream to produce an ANTLR tree representation of a translation unit
      2. uses: util, config, token
      3. interface:
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         dev.civl.abc.front.c.parse.IF

         ,
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         dev.civl.abc.front.fortran.parse.IF

      4. entry point:
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         Parse

         ,
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         Parse

   3. ptree
5. ast
   1. responsibilities: representation and manipulation of an Abstract Syntax Tree and associated entities
   2. uses: util, token
   3. interface: dev.civl.abc.ast.IF
   4. entry point: ASTs
   5. submodules
      1. value
         1. responsibilities: representation of concrete value, such as characters, integers, floating point values
         2. interface: dev.civl.abc.ast.value.IF
         3. entry point: Values
      2. type
         1. responsibilities: representation of types
         2. interface: dev.civl.abc.ast.type.IF
         3. entry point: Types
      3. entity
         1. responsibilities: representation of abstract program entities which can be named by an identifier, including variables, functions, labels, scopes, structures, unions, enumerations, enumerators, and typedefs
         2. interface: dev.civl.abc.ast.entity.IF
         3. entry point: Entities
      4. conversion
         1. responsibilities: representation of C's implicit conversions, such as the conversion of an array to a pointer to the first element of the array, and so on
         2. interface: dev.civl.abc.ast.conversion.IF
         3. entry point: Conversions
      5. node
         1. responsibilities: representation of AST nodes
         2. interface: dev.civl.abc.ast.node.IF
         3. entry point: Nodes
6. astgen
   1. responsibilities: translation of ANTLR tree to AST
   2. uses: util, token, front, ast
   3. interface:
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      dev.civl.abc.astgen.IF

      ,
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      dev.civl.abc.astgen.c.IF

      ,
      invalid reference

      dev.civl.abc.astgen.fortran.IF

   4. entry point:
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      dev.civl.abc.astgen.IF.ASTGenerator

7. analysis
   1. responsibilities: analyzing AST, creation of entities, resolution of all identifiers, determination of all scopes, types, and entities
   2. uses: config, token, ast
   3. interface: dev.civl.abc.analysis.IF
   4. entry point: Analysis
8. transform
   1. responsibilities: transformations of an AST
   2. uses: token, ast
   3. interface: dev.civl.abc.transform.IF
   4. entry point: Transform
9. program
   1. responsibilities: mutable representation of a program
   2. uses: token, ast, analysis, transform
   3. interface: dev.civl.abc.program.IF
   4. entry point: Programs
10. main
    1. responsibilities: command line interface, Activator class for marshaling of tools in tool chain
    2. uses: util, token, front, ast, astgen, analysis, transform, program
    3. interface:
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       dev.civl.abc

    4. entry point:
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       ABC

Modules

Module	Description
dev.civl.abc