From 47c9021401a69d407a3e730012824cae75dd66f9 Mon Sep 17 00:00:00 2001
From: Alon Zakai <alonzakai@gmail.com>
Date: Tue, 24 Oct 2017 20:36:28 -0700
Subject: notation change: AST => IR (#1245)

The IR is indeed a tree, but not an "abstract syntax tree" since there is no language for which it is the syntax (except in the most trivial and meaningless sense).
---
 src/ir/memory-utils.h | 56 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 56 insertions(+)
 create mode 100644 src/ir/memory-utils.h

(limited to 'src/ir/memory-utils.h')

diff --git a/src/ir/memory-utils.h b/src/ir/memory-utils.h
new file mode 100644
index 000000000..920583f7d
--- /dev/null
+++ b/src/ir/memory-utils.h
@@ -0,0 +1,56 @@
+/*
+ * Copyright 2017 WebAssembly Community Group participants
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef wasm_ir_memory_h
+#define wasm_ir_memory_h
+
+#include <algorithm>
+#include <vector>
+
+#include "literal.h"
+#include "wasm.h"
+
+namespace wasm {
+
+namespace MemoryUtils {
+  // flattens memory into a single data segment. returns true if successful
+  inline bool flatten(Memory& memory) {
+    if (memory.segments.size() == 0) return true;
+    std::vector<char> data;
+    for (auto& segment : memory.segments) {
+      auto* offset = segment.offset->dynCast<Const>();
+      if (!offset) return false;
+    }
+    for (auto& segment : memory.segments) {
+      auto* offset = segment.offset->dynCast<Const>();
+      auto start = offset->value.getInteger();
+      auto end = start + segment.data.size();
+      if (end > data.size()) {
+        data.resize(end);
+      }
+      std::copy(segment.data.begin(), segment.data.end(), data.begin() + start);
+    }
+    memory.segments.resize(1);
+    memory.segments[0].offset->cast<Const>()->value = Literal(int32_t(0));
+    memory.segments[0].data.swap(data);
+    return true;
+  }
+};
+
+} // namespace wasm
+
+#endif // wasm_ir_memory_h
+
-- 
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