Name mangling

Scala Native toolchain mangles names for all definitions except the ones which have been explicitly exported to C using extern. Mangling scheme is defined through a simple grammar that uses a notation inspired by Itanium ABI:

<mangled-name> ::=
    _S <defn-name>

<defn-name> ::=
    T <name>                       // top-level name
    M <name> <sig-name>            // member name

<sig-name> ::=
    F <name>                       // field name
    R <type-name>+ E               // constructor name
    D <name> <type-name>+ E        // method name
    P <name> <type-name>+ E        // proxy name
    C <name>                       // c extern name
    G <name>                       // generated name
    K <sig-name> <type-name>+ E    // duplicate name

<type-name> ::=
    v                              // c vararg
    R _                            // c pointer type-name
    R <type-name>+ E               // c function type-name
    S <type-name>+ E               // c anonymous struct type-name
    A <type-name> <number> _       // c array type-name
    <integer-type-name>            // signed integer type-name
    z                              // scala.Boolean
    c                              // scala.Char
    f                              // scala.Float
    d                              // scala.Double
    u                              // scala.Unit
    l                              // scala.Null
    n                              // scala.Nothing
    L <nullable-type-name>         // nullable type-name
    A <type-name> _                // nonnull array type-name
    X <name>                       // nonnull exact class type-name
    <name>                         // nonnull class type-name

<nullable-type-name> ::=
    A <type-name> _                // nullable array type-name
    X <name>                       // nullable exact class type-name
    <name>                         // nullable class type-name

<integer-type-name> ::=
    b                              // scala.Byte
    s                              // scala.Short
    i                              // scala.Int
    j                              // scala.Long

<name> ::=
    <length number> <chars>        // raw identifier of given length