Treelang is a programming language created in 1988.
| #2380on PLDB | 36Years Old |
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.. Read more on Wikipedia...
// 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);
}| Feature | Supported | Example | Token |
|---|---|---|---|
| Comments | ✓ | // A comment | |
| Line Comments | ✓ | // A comment | // |
| Semantic Indentation | X |