1 files changed, 85 insertions, 0 deletions
diff --git a/third_party/rust/parity-wasm/src/builder/table.rs b/third_party/rust/parity-wasm/src/builder/table.rs
new file mode 100644
index 0000000000..29bbe2d2dc
--- /dev/null
+++ b/third_party/rust/parity-wasm/src/builder/table.rs
@@ -0,0 +1,85 @@
+use alloc::vec::Vec;
+use crate::elements;
+use super::invoke::{Invoke, Identity};
+
+/// Table definition
+#[derive(Debug, PartialEq)]
+pub struct TableDefinition {
+	/// Minimum length
+	pub min: u32,
+	/// Maximum length, if any
+	pub max: Option<u32>,
+	/// Element segments, if any
+	pub elements: Vec<TableEntryDefinition>,
+}
+
+/// Table elements entry definition
+#[derive(Debug, PartialEq)]
+pub struct TableEntryDefinition {
+	/// Offset initialization expression
+	pub offset: elements::InitExpr,
+	/// Values of initialization
+	pub values: Vec<u32>,
+}
+
+/// Table builder
+pub struct TableBuilder<F=Identity> {
+	callback: F,
+	table: TableDefinition,
+}
+
+impl TableBuilder {
+	/// New table builder
+	pub fn new() -> Self {
+		TableBuilder::with_callback(Identity)
+	}
+}
+
+impl<F> TableBuilder<F> where F: Invoke<TableDefinition> {
+	/// New table builder with callback in chained context
+	pub fn with_callback(callback: F) -> Self {
+		TableBuilder {
+			callback: callback,
+			table: Default::default(),
+		}
+	}
+
+	/// Set/override minimum length
+	pub fn with_min(mut self, min: u32) -> Self {
+		self.table.min = min;
+		self
+	}
+
+	/// Set/override maximum length
+	pub fn with_max(mut self, max: Option<u32>) -> Self {
+		self.table.max = max;
+		self
+	}
+
+	/// Generate initialization expression and element values on specified index
+	pub fn with_element(mut self, index: u32, values: Vec<u32>) -> Self {
+		self.table.elements.push(TableEntryDefinition {
+			offset: elements::InitExpr::new(vec![
+				elements::Instruction::I32Const(index as i32),
+				elements::Instruction::End,
+			]),
+			values: values,
+		});
+		self
+	}
+
+	/// Finalize current builder spawning resulting struct
+	pub fn build(self) -> F::Result {
+		self.callback.invoke(self.table)
+	}
+}
+
+impl Default for TableDefinition {
+	fn default() -> Self {
+		TableDefinition {
+			min: 0,
+			max: None,
+			elements: Vec::new(),
+		}
+	}
+}