[wasm][eh] Update interpreter 'delegate' behavior

Bug: v8:8091, chromium:1247119
Change-Id: Icafd0bf9277aed835032396c2512e7d991407e0d
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3144910Reviewed-by: Clemens Backes <clemensb@chromium.org>
Commit-Queue: Thibaud Michaud <thibaudm@chromium.org>
Cr-Commit-Position: refs/heads/main@{#76720}

test/cctest/wasm/test-run-wasm-interpreter.cc

@@ -504,6 +504,13 @@ TEST(Regress1092130) {
   r.Call();
 }
 
+TEST(Regress1247119) {
+  WasmRunner<uint32_t> r(TestExecutionTier::kInterpreter);
+  BUILD(r, kExprLoop, 0, kExprTry, 0, kExprUnreachable, kExprDelegate, 0,
+        kExprEnd);
+  r.Call();
+}
+
 }  // namespace test_run_wasm_interpreter
 }  // namespace wasm
 }  // namespace internal

test/common/wasm/wasm-interpreter.cc

@@ -968,12 +968,17 @@ class SideTable : public ZoneObject {
           Control* c = &control_stack.back();
           const size_t new_stack_size = control_stack.size() - 1;
           const size_t max_depth = new_stack_size - 1;
-          if (imm.depth < max_depth) {
+          size_t target_depth = imm.depth;
+          while (target_depth < max_depth &&
+                 *control_stack[max_depth - target_depth].pc != kExprTry) {
+            target_depth++;
+          }
+          if (target_depth < max_depth) {
             constexpr int kUnusedControlIndex = -1;
             c->else_label->Bind(i.pc(), kRethrowOrDelegateExceptionIndex,
                                 kUnusedControlIndex);
             c->else_label->Finish(&map_, code->start);
-            Control* target = &control_stack[max_depth - imm.depth];
+            Control* target = &control_stack[max_depth - target_depth];
             DCHECK_EQ(*target->pc, kExprTry);
             DCHECK_NOT_NULL(target->else_label);
             if (!control_parent().unreachable) {