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-rw-r--r--js/src/frontend/BytecodeEmitter.cpp18
1 files changed, 16 insertions, 2 deletions
diff --git a/js/src/frontend/BytecodeEmitter.cpp b/js/src/frontend/BytecodeEmitter.cpp
index f16450db9..f629c86e5 100644
--- a/js/src/frontend/BytecodeEmitter.cpp
+++ b/js/src/frontend/BytecodeEmitter.cpp
@@ -5365,7 +5365,14 @@ BytecodeEmitter::emitIteratorClose(IteratorKind iterKind /* = IteratorKind::Sync
checkTypeSet(JSOP_CALL);
if (iterKind == IteratorKind::Async) {
- if (!emitAwait()) // ... ... RESULT
+ if (completionKind != CompletionKind::Throw) {
+ // Await clobbers rval, so save the current rval.
+ if (!emit1(JSOP_GETRVAL)) // ... ... RESULT RVAL
+ return false;
+ if (!emit1(JSOP_SWAP)) // ... ... RVAL RESULT
+ return false;
+ }
+ if (!emitAwait()) // ... ... RVAL? RESULT
return false;
}
@@ -5395,8 +5402,15 @@ BytecodeEmitter::emitIteratorClose(IteratorKind iterKind /* = IteratorKind::Sync
if (!emit1(JSOP_POP)) // ... RESULT
return false;
} else {
- if (!emitCheckIsObj(CheckIsObjectKind::IteratorReturn)) // ... RESULT
+ if (!emitCheckIsObj(CheckIsObjectKind::IteratorReturn)) // ... RVAL? RESULT
return false;
+
+ if (iterKind == IteratorKind::Async) {
+ if (!emit1(JSOP_SWAP)) // ... RESULT RVAL
+ return false;
+ if (!emit1(JSOP_SETRVAL)) // ... RESULT
+ return false;
+ }
}
if (!ifReturnMethodIsDefined.emitElse())