Merge pull request #37 from WebAssembly/extern-error

Emit error message when an unknown symbol is found

1 files changed, 6 insertions, 1 deletions

diff --git a/src/s2wasm.h b/src/s2wasm.h
index 45d943446..b732464d9 100644
--- a/src/s2wasm.h
+++ b/src/s2wasm.h
@@ -961,7 +961,12 @@ private:
       Const* curr = triple.value;
       Name name = triple.name;
       size_t offset = triple.offset;
-      curr->value = Literal(staticAddresses[name] + offset);
+      const auto &symbolAddress = staticAddresses.find(name);
+      if (symbolAddress == staticAddresses.end()) {
+        std::cerr << "Unknown symbol: " << name << '\n';
+        abort_on("Unknown symbol");
+      }
+      curr->value = Literal(symbolAddress->second + offset);
       assert(curr->value.i32 > 0);
       curr->type = i32;
     }