[Yul] leave statement.

libyul/backends/wasm/EWasmAST.h

@@ -42,10 +42,11 @@ struct If;
 struct Loop;
 struct Break;
 struct BreakIf;
+struct Return;
 using Expression = boost::variant<
 	Literal, StringLiteral, LocalVariable, GlobalVariable,
 	FunctionCall, BuiltinCall, LocalAssignment, GlobalAssignment,
-	Block, If, Loop, Break, BreakIf
+	Block, If, Loop, Break, BreakIf, Return
 >;
 
 struct Literal { uint64_t value; };
@@ -65,6 +66,7 @@ struct If {
 };
 struct Loop { std::string labelName; std::vector<Expression> statements; };
 struct Break { Label label; };
+struct Return {};
 struct BreakIf { Label label; std::unique_ptr<Expression> condition; };
 
 struct VariableDeclaration { std::string variableName; };

libyul/backends/wasm/EWasmCodeTransform.cpp

@@ -257,6 +257,11 @@ wasm::Expression EWasmCodeTransform::operator()(Continue const&)
 	return wasm::Break{wasm::Label{m_breakContinueLabelNames.top().second}};
 }
 
+wasm::Expression EWasmCodeTransform::operator()(Leave const&)
+{
+	return wasm::Return{};
+}
+
 wasm::Expression EWasmCodeTransform::operator()(Block const& _block)
 {
 	return wasm::Block{{}, visit(_block.statements)};

libyul/backends/wasm/EWasmCodeTransform.h

@@ -52,6 +52,7 @@ public:
 	wasm::Expression operator()(yul::ForLoop const&);
 	wasm::Expression operator()(yul::Break const&);
 	wasm::Expression operator()(yul::Continue const&);
+	wasm::Expression operator()(yul::Leave const&);
 	wasm::Expression operator()(yul::Block const& _block);
 
 private:

libyul/backends/wasm/EWasmToText.cpp

@@ -128,6 +128,11 @@ string EWasmToText::operator()(wasm::BreakIf const& _break)
 	return "(br_if $" + _break.label.name + " " + visit(*_break.condition) + ")\n";
 }
 
+string EWasmToText::operator()(wasm::Return const&)
+{
+	return "(return)\n";
+}
+
 string EWasmToText::operator()(wasm::Block const& _block)
 {
 	string label = _block.labelName.empty() ? "" : " $" + _block.labelName;

libyul/backends/wasm/EWasmToText.h

@@ -49,6 +49,7 @@ public:
 	std::string operator()(wasm::If const& _if);
 	std::string operator()(wasm::Loop const& _loop);
 	std::string operator()(wasm::Break const& _break);
+	std::string operator()(wasm::Return const& _return);
 	std::string operator()(wasm::BreakIf const& _break);
 	std::string operator()(wasm::Block const& _block);