if we start to parse an s-string and find it empty, that is invalid #570 (#571)

1 files changed, 1 insertions, 0 deletions

diff --git a/src/wasm-s-parser.h b/src/wasm-s-parser.h
index 633d8329e..8e7cf0775 100644
--- a/src/wasm-s-parser.h
+++ b/src/wasm-s-parser.h
@@ -243,6 +243,7 @@ private:
       return allocator.alloc<Element>()->setString(IString(str.c_str(), false), dollared)->setMetadata(line, start - lineStart);
     }
     while (input[0] && !isspace(input[0]) && input[0] != ')' && input[0] != '(' && input[0] != ';') input++;
+    if (start == input) throw ParseException("expected string", line, input - lineStart);
     char temp = input[0];
     input[0] = 0;
     auto ret = allocator.alloc<Element>()->setString(IString(start, false), dollared)->setMetadata(line, start - lineStart);