Method set_by_name

cranelift/codegen/src/ir/memflags.rs:208–233

Set a flag bit by name. Returns true if the flag was found and set, false for an unknown flag name. # Errors Returns an error message if the `name` is known but couldn't be applied due to it being a semantic error.

(&mut self, name: &str)

    /// Returns an error message if the `name` is known but couldn't be applied
    /// due to it being a semantic error.
    pub fn set_by_name(&mut self, name: &str) -> Result<bool, &'static str> {
        *self = match name {
            "notrap" => self.with_trap_code(None),
            "aligned" => self.with_aligned(),
            "readonly" => self.with_readonly(),
            "little" => {
                if self.flags.explicit_endianness() == Some(Endianness::Big) {
                    return Err("cannot set both big and little endian bits");
                }
                self.with_endianness(Endianness::Little)
            }
            "big" => {
                if self.flags.explicit_endianness() == Some(Endianness::Little) {
                    return Err("cannot set both big and little endian bits");
                }
                self.with_endianness(Endianness::Big)
            }
            "can_move" => self.with_can_move(),

            other => match TrapCode::from_str(other) {
                Ok(code) => self.with_trap_code(Some(code)),
                Err(()) => return Ok(false),
            },
        };
        Ok(true)
    }

    /// Return endianness of the memory access.  This will return the endianness
    /// explicitly specified by the flags if any, and will default to the native