Be more strict about number literals in assembly.

libsolidity/inlineasm/AsmParser.cpp

@@ -23,6 +23,9 @@
 #include <libsolidity/inlineasm/AsmParser.h>
 #include <libsolidity/parsing/Scanner.h>
 #include <libsolidity/interface/ErrorReporter.h>
+
+#include <boost/algorithm/string.hpp>
+
 #include <ctype.h>
 #include <algorithm>
 
@@ -297,6 +300,8 @@ assembly::Statement Parser::parseElementaryOperation(bool _onlySinglePusher)
 			kind = LiteralKind::String;
 			break;
 		case Token::Number:
+			if (!isValidNumberLiteral(currentLiteral()))
+				fatalParserError("Invalid number literal.");
 			kind = LiteralKind::Number;
 			break;
 		case Token::TrueLiteral:
@@ -501,3 +506,19 @@ string Parser::expectAsmIdentifier()
 	expectToken(Token::Identifier);
 	return name;
 }
+
+bool Parser::isValidNumberLiteral(string const& _literal)
+{
+	try
+	{
+		u256(_literal);
+	}
+	catch (...)
+	{
+		return false;
+	}
+	if (boost::starts_with(_literal, "0x"))
+		return true;
+	else
+		return _literal.find_first_not_of("0123456789") == string::npos;
+}

libsolidity/inlineasm/AsmParser.h

@@ -75,6 +75,8 @@ protected:
 	TypedName parseTypedName();
 	std::string expectAsmIdentifier();
 
+	static bool isValidNumberLiteral(std::string const& _literal);
+
 private:
 	bool m_julia = false;
 };