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-rw-r--r--js/src/frontend/BytecodeEmitter.cpp8
1 files changed, 8 insertions, 0 deletions
diff --git a/js/src/frontend/BytecodeEmitter.cpp b/js/src/frontend/BytecodeEmitter.cpp
index b2e48d7ea..4d3b60c2f 100644
--- a/js/src/frontend/BytecodeEmitter.cpp
+++ b/js/src/frontend/BytecodeEmitter.cpp
@@ -5318,6 +5318,14 @@ BytecodeEmitter::wrapWithDestructuringIteratorCloseTryNote(int32_t iterDepth, In
{
MOZ_ASSERT(this->stackDepth >= iterDepth);
+ // Pad a nop at the beginning of the bytecode covered by the trynote so
+ // that when unwinding environments, we may unwind to the scope
+ // corresponding to the pc *before* the start, in case the first bytecode
+ // emitted by |emitter| is the start of an inner scope. See comment above
+ // UnwindEnvironmentToTryPc.
+ if (!emit1(JSOP_TRY_DESTRUCTURING_ITERCLOSE))
+ return false;
+
ptrdiff_t start = offset();
if (!emitter(this))
return false;