treelang.scroll

import ../code/conceptPage.scroll

id treelang
name Treelang
appeared 1988
tags pl

centralPackageRepositoryCount 0
reference https://web.archive.org/web/20011108165657/http://www.geocities.com/timjosling/treelang.diff.txt

lineCommentToken //

hasLineComments true
 // A comment
hasComments true
 // A comment
hasSemanticIndentation false

wikipedia https://en.wikipedia.org/wiki/Treelang
 example
  // function prototypes
       // function 'add' taking two ints and returning an int
       external_definition int add(int arg1, int arg2);
       external_definition int subtract(int arg3, int arg4);
       external_definition int first_nonzero(int arg5, int arg6);
       external_definition int double_plus_one(int arg7);
       external_definition int main();
  
       // function definition
       add
       {
         // return the sum of arg1 and arg2
         return arg1 + arg2;
       }
    
       subtract
       {
         return arg3 - arg4;
       }
  
       double_plus_one
       {
         // aaa is a variable, of type integer and allocated at the start of the function
         automatic int aaa;
         // set aaa to the value returned from add, when passed arg7 and arg7 as the two parameters
         aaa=add(arg7, arg7);
         aaa=add(aaa, aaa);
         aaa=subtract(subtract(aaa, arg7), arg7) + 1;
         return aaa;
       }
       
       first_nonzero
       {
         // C-like if statement
         if (arg5)
           {
             return arg5;
           }
         else
           {
           }
         return arg6;
       }
  
       // Like C, 'gtreelang' needs the main to be defined to create an executable.
       main
       {
            return double_plus_one(5);
       }
 related c
 summary Treelang is a "toy" programming language distributed with the GNU Compiler Collection (GCC) to demonstrate the features of its code-generation backend. It was developed by Tim Josling, based on a language called Toy created by Richard Kenner.  During the GCC 4.3 release cycle, a patch was committed to remove the language, because of high maintenance costs outweighing its benefits and also because it was no longer considered a good front-end example by GCC developers.
 created 2004
 backlinksCount 5
 pageId 799463
 revisionCount 37
 dailyPageViews 2
 appeared 2008

isbndb 0