[Yul] Adds break/continue statements and some general tests for for-loop syntax.

libyul/AsmParser.cpp

@@ -23,6 +23,7 @@
 #include <libyul/AsmParser.h>
 #include <liblangutil/Scanner.h>
 #include <liblangutil/ErrorReporter.h>
+#include <libdevcore/Common.h>
 
 #include <boost/algorithm/string.hpp>
 
@@ -104,6 +105,32 @@ Statement Parser::parseStatement()
 	}
 	case Token::For:
 		return parseForLoop();
+	case Token::Break:
+		if (m_insideForLoopBody)
+		{
+			auto stmt = Statement{ createWithLocation<Break>() };
+			m_scanner->next();
+			return stmt;
+		}
+		else
+		{
+			m_errorReporter.syntaxError(location(), "Keyword break outside for-loop body is not allowed.");
+			m_scanner->next();
+			return {};
+		}
+	case Token::Continue:
+		if (m_insideForLoopBody)
+		{
+			auto stmt = Statement{ createWithLocation<Continue>() };
+			m_scanner->next();
+			return stmt;
+		}
+		else
+		{
+			m_errorReporter.syntaxError(location(), "Keyword continue outside for-loop body is not allowed.");
+			m_scanner->next();
+			return {};
+		}
 	case Token::Assign:
 	{
 		if (m_dialect->flavour != AsmFlavour::Loose)
@@ -243,13 +270,19 @@ Case Parser::parseCase()
 
 ForLoop Parser::parseForLoop()
 {
+	bool outerForLoopBody = m_insideForLoopBody;
+	m_insideForLoopBody = false;
+
 	RecursionGuard recursionGuard(*this);
 	ForLoop forLoop = createWithLocation<ForLoop>();
 	expectToken(Token::For);
 	forLoop.pre = parseBlock();
 	forLoop.condition = make_unique<Expression>(parseExpression());
 	forLoop.post = parseBlock();
+
+	m_insideForLoopBody = true;
 	forLoop.body = parseBlock();
+	m_insideForLoopBody = outerForLoopBody;
 	forLoop.location.end = forLoop.body.location.end;
 	return forLoop;
 }
@@ -455,6 +488,9 @@ VariableDeclaration Parser::parseVariableDeclaration()
 FunctionDefinition Parser::parseFunctionDefinition()
 {
 	RecursionGuard recursionGuard(*this);
+	auto outerForLoopBody = m_insideForLoopBody;
+	m_insideForLoopBody = false;
+	ScopeGuard restoreInsideForLoopBody{[&]() { m_insideForLoopBody = outerForLoopBody; }};
 	FunctionDefinition funDef = createWithLocation<FunctionDefinition>();
 	expectToken(Token::Function);
 	funDef.name = expectAsmIdentifier();