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use crate::io;
use super::{Deserialize, Serialize, Error, GlobalType, InitExpr};

/// Global entry in the module.
#[derive(Clone, Debug, PartialEq)]
pub struct GlobalEntry {
	global_type: GlobalType,
	init_expr: InitExpr,
}

impl GlobalEntry {
	/// New global entry.
	pub fn new(global_type: GlobalType, init_expr: InitExpr) -> Self {
		GlobalEntry {
			global_type: global_type,
			init_expr: init_expr,
		}
	}
	/// Global type.
	pub fn global_type(&self) -> &GlobalType { &self.global_type }
	/// Initialization expression (instructions) for global.
	pub fn init_expr(&self) -> &InitExpr { &self.init_expr }
	/// Global type (mutable).
	pub fn global_type_mut(&mut self) -> &mut GlobalType { &mut self.global_type }
	/// Initialization expression (instructions) for global (mutable).
	pub fn init_expr_mut(&mut self) -> &mut InitExpr { &mut self.init_expr }
}

impl Deserialize for GlobalEntry {
	type Error = Error;

	fn deserialize<R: io::Read>(reader: &mut R) -> Result<Self, Self::Error> {
		let global_type = GlobalType::deserialize(reader)?;
		let init_expr = InitExpr::deserialize(reader)?;

		Ok(GlobalEntry {
			global_type: global_type,
			init_expr: init_expr,
		})
	}
}

impl Serialize for GlobalEntry {
	type Error = Error;

	fn serialize<W: io::Write>(self, writer: &mut W) -> Result<(), Self::Error> {
		self.global_type.serialize(writer)?;
		self.init_expr.serialize(writer)
	}
}