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ETrice/GSoC/2012/GACL

Generic Action Code Language (GACL)

GACL is the language to describe the Detail Code for execution of ROOM Models in eTrice plugin . GACL aims at dealing with all features commonly available in imperative languages , especially Java , C/C++ . It will act as complement of current version of eTrice which uses code written in target language stored in a string as execution code . GACL would make user able to write execution code independent of target language .

Development Details and Core Information

Features of GACL

  • Variable Declarations ( with optional initializers ) and Function Declaration .
  • Comparison & arithmetic expressions .
  • Basic types , and user defined types .
  • If-else blocks and ladders .
  • For , while , for each , enhanched for each .
  • Support for iterators (that can be used by for each loops ) .
  • Function Calls with arguments & diff types i.e. ref/value/address .
  • type checking and as much as possible implicit type casting .
  • Casts corresponding to static casts in C .

Thoughts on Syntax

Although syntax for GACL is still being designed but here are few thought regarding syntax .

Empty

 {}

Type Declaration

 "type" typename [ existingtype | "{" TypeCode "}"]

VariableDeclaration

 [[[ETrice/GSoC/2012/GACL#Type_Declaration | type]]] varname [ "=" { varname2 |  Expression } ] { ";" | "\n" }

Expression

 { [[ETrice/GSoC/2012/GACL#ArithmeticExpression | ArithmeticExpression] | [[ETrice/GSoC/2012/GACL#LogicalExpression | LogicalExpression] }

ArithmeticExpression

 { [[ETrice/GSoC/2012/GACL#Expression | Expression] { "+" | "-" | "*" | "/" | "**" | "^" | "%" | "div" } [[ETrice/GSoC/2012/GACL#Expression | Expression] } 
| {[[ETrice/GSoC/2012/GACL#Expression | Expression] { "++" | "--" } } | { { "++" | "--" } [[ETrice/GSoC/2012/GACL#Expression | Expression] }

LogicalExpression

 { [[ETrice/GSoC/2012/GACL#Expression | Expression] { "<" | "<=" | "==" | ">" | ">=" | "|" | "||" | "&" | "&&" | "^" } [[ETrice/GSoC/2012/GACL#Expression | Expression] }

Statement

 { [[ETrice/GSoC/2012/GACL#Expression | Expression] | [[ETrice/GSoC/2012/GACL#Expression | Expression] }

StatementList

 { Empty | [[ETrice/GSoC/2012/GACL#Statement | Statement] [[ETrice/GSoC/2012/GACL#Statementlist | Statementlist] }

Program

 { [[ETrice/GSoC/2012/GACL#Statementlist | Statementlist]}


Disambiguation

The syntax used to specify the grammar in brief is

  • Things written in double quotes ("") stand as string written in source .
  • Content inside braces ({}) represents required content .
  • Content inside square brackets ([]) represents optional content .
  • Everything rest is either terminal or non-terminals .
  • Empty and statement list need a more thought to be done . We would surely finally come up with a better solution .

Project Proposal

Click Here to see the project proposal at gsoc's website .

Click Here to see the project proposal in my github repository .

Useful Links