From c74acc0baece1296ad58a0ff44119fb36d98d2c6 Mon Sep 17 00:00:00 2001
From: Alon Zakai <azakai@google.com>
Date: Mon, 25 Jan 2021 18:12:37 +0000
Subject: Debug info handling for new EH try-catch (#3496)

We now have multiple catches in each try, and a possible catch-all.

This changes our "extra delimiter" storage to store either an "else"
(unchanged from before) or an arbitrary list of things - we use that
for catches.
---
 src/support/small_vector.h | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

(limited to 'src/support/small_vector.h')

diff --git a/src/support/small_vector.h b/src/support/small_vector.h
index 2e65eda41..8ab10c05b 100644
--- a/src/support/small_vector.h
+++ b/src/support/small_vector.h
@@ -181,6 +181,30 @@ public:
   ConstIterator end() const { return ConstIterator(this, size()); }
 };
 
+// A SmallVector for which some values may be read before they are written, and
+// in that case they have the value zero.
+template<typename T, size_t N>
+struct ZeroInitSmallVector : public SmallVector<T, N> {
+  T& operator[](size_t i) {
+    if (i >= this->size()) {
+      resize(i + 1);
+    }
+    return SmallVector<T, N>::operator[](i);
+  }
+
+  const T& operator[](size_t i) const {
+    return const_cast<ZeroInitSmallVector<T, N>&>(*this)[i];
+  }
+
+  void resize(size_t newSize) {
+    auto oldSize = this->size();
+    SmallVector<T, N>::resize(newSize);
+    for (size_t i = oldSize; i < this->size(); i++) {
+      (*this)[i] = 0;
+    }
+  }
+};
+
 } // namespace wasm
 
 #endif // wasm_support_small_vector_h
-- 
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