This Month in Mun - December 2019

January 01, 2020, The Mun Team

December is often perceived as a month that emphasizes family and togetherness. The Mun community for one really did pull together, allowing the core contributors to focus on making data structures a reality. This month, we’ve implemented:

  • Parsing of tuple data structures

    struct Baz(float, int);
  • Parsing and type inferencing of data structure literals

    struct Foo;
    struct Bar {
        a: float,
    }
    struct Baz(float, int);
    
    fn main() {
        let a: Foo = Foo;
        let b: Bar = Bar { a: 1.23, };
        let c = Baz(1.23, 1);
    }
  • Indexing of data structure fields

    fn main() {
        let foo = Foo { a: 1.23, };
        foo.a
        let bar = Bar(1.23, 4);
        bar.0
        bar.1;
    }
  • Generation of LLVM IR for data structure declarations, literals, and field indexing
  • Add data structure information to the Mun ABI

    typedef struct
    {
        /// Struct name
        const char *name;
        /// Struct fields' information
        const MunTypeInfo *field_types;
        /// Number of fields
        const uint16_t num_fields;
    } MunStructInfo;
  • Loading data structure information into the Mun Runtime

We also made some minor fixes for the latest version of Rust and added type checking of binary operations:

fn foo() {
    let b = false;
    let n = 1;
    let _ = b + n; // error: invalid binary operation
}

Meanwhile, the Mun community has not been standing by idly:

  • We welcomed our first community contributions (PRs #66 & #67) for two of our good first issues. This is a great way for community members to gain an understanding of our codebase and workflow, while helping us implement important fixes and improvements.
  • A community member who works on Veloren, created a proof of concept for Mun-powered hot reloading inside the game:

    Mun hot reloading in Veloren

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