Fix table exporting (#4736)

This code was apparently not updated when we added multi-table support,
and still had the old hardcoded index 0.

Fixes #4711

2 files changed, 22 insertions, 1 deletions

diff --git a/src/wasm/wasm-binary.cpp b/src/wasm/wasm-binary.cpp
index decd78852..6cbf880e3 100644
--- a/src/wasm/wasm-binary.cpp
+++ b/src/wasm/wasm-binary.cpp
@@ -492,9 +492,10 @@ void WasmBinaryWriter::writeExports() {
         o << U32LEB(getFunctionIndex(curr->value));
         break;
       case ExternalKind::Table:
-        o << U32LEB(0);
+        o << U32LEB(getTableIndex(curr->value));
         break;
       case ExternalKind::Memory:
+        // TODO: fix with multi-memory
         o << U32LEB(0);
         break;
       case ExternalKind::Global:
diff --git a/test/lit/table-multi-export.wast b/test/lit/table-multi-export.wast
new file mode 100644
index 000000000..fd3cc1f7f
--- /dev/null
+++ b/test/lit/table-multi-export.wast
@@ -0,0 +1,20 @@
+;; NOTE: Assertions have been generated by update_lit_checks.py --all-items and should not be edited.
+
+;; RUN: wasm-opt %s -all --roundtrip --print | filecheck %s
+
+;; Test that we properly read and write table exports in the binary format.
+(module
+ ;; Two different tables, each exported.
+
+ ;; CHECK:      (table $0 25 25 funcref)
+ (table $0 25 25 funcref)
+ ;; CHECK:      (table $1 32 anyref)
+ (table $1 32 anyref)
+
+ ;; Each export should export the right table.
+
+ ;; CHECK:      (export "table0" (table $0))
+ (export "table0" (table $0))
+ ;; CHECK:      (export "table1" (table $1))
+ (export "table1" (table $1))
+)