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diff --git a/js/src/wasm/WasmGeneratedSourceMap.h b/js/src/wasm/WasmGeneratedSourceMap.h
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+++ b/js/src/wasm/WasmGeneratedSourceMap.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ * vim: set ts=8 sts=4 et sw=4 tw=99:
+ *
+ * Copyright 2016 Mozilla Foundation
+ *
+ * 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_generated_source_map_h
+#define wasm_generated_source_map_h
+
+#include "mozilla/Vector.h"
+
+#include "vm/StringBuffer.h"
+
+namespace js {
+
+namespace wasm {
+
+// The generated source location for the AST node/expression. The offset field refers
+// an offset in an binary format file.
+struct ExprLoc
+{
+    uint32_t lineno;
+    uint32_t column;
+    uint32_t offset;
+    ExprLoc() : lineno(0), column(0), offset(0) {}
+    ExprLoc(uint32_t lineno_, uint32_t column_, uint32_t offset_) : lineno(lineno_), column(column_), offset(offset_) {}
+};
+
+typedef mozilla::Vector<ExprLoc, 0, TempAllocPolicy> ExprLocVector;
+
+// The generated source WebAssembly function lines and expressions ranges.
+struct FunctionLoc
+{
+    size_t startExprsIndex;
+    size_t endExprsIndex;
+    uint32_t startLineno;
+    uint32_t endLineno;
+    FunctionLoc(size_t startExprsIndex_, size_t endExprsIndex_, uint32_t startLineno_, uint32_t endLineno_)
+      : startExprsIndex(startExprsIndex_),
+        endExprsIndex(endExprsIndex_),
+        startLineno(startLineno_),
+        endLineno(endLineno_)
+    {}
+};
+
+typedef mozilla::Vector<FunctionLoc, 0, TempAllocPolicy> FunctionLocVector;
+
+// The generated source map for WebAssembly binary file. This map is generated during
+// building the text buffer (see BinaryToExperimentalText).
+class GeneratedSourceMap
+{
+    ExprLocVector exprlocs_;
+    FunctionLocVector functionlocs_;
+    uint32_t totalLines_;
+
+  public:
+    explicit GeneratedSourceMap(JSContext* cx)
+     : exprlocs_(cx),
+       functionlocs_(cx),
+       totalLines_(0)
+    {}
+    ExprLocVector& exprlocs() { return exprlocs_; }
+    FunctionLocVector& functionlocs() { return functionlocs_; }
+
+    uint32_t totalLines() { return totalLines_; }
+    void setTotalLines(uint32_t val) { totalLines_ = val; }
+};
+
+typedef UniquePtr<GeneratedSourceMap> UniqueGeneratedSourceMap;
+
+// Helper class, StringBuffer wrapper, to track the position (line and column)
+// within the generated source.
+class WasmPrintBuffer
+{
+    StringBuffer& stringBuffer_;
+    uint32_t lineno_;
+    uint32_t column_;
+
+  public:
+    explicit WasmPrintBuffer(StringBuffer& stringBuffer)
+      : stringBuffer_(stringBuffer),
+        lineno_(1),
+        column_(1)
+    {}
+    inline char processChar(char ch) {
+        if (ch == '\n') {
+            lineno_++; column_ = 1;
+        } else
+            column_++;
+        return ch;
+    }
+    inline char16_t processChar(char16_t ch) {
+        if (ch == '\n') {
+            lineno_++; column_ = 1;
+        } else
+            column_++;
+        return ch;
+    }
+    bool append(const char ch) {
+        return stringBuffer_.append(processChar(ch));
+    }
+    bool append(const char16_t ch) {
+        return stringBuffer_.append(processChar(ch));
+    }
+    bool append(const char* str, size_t length) {
+        for (size_t i = 0; i < length; i++)
+            processChar(str[i]);
+        return stringBuffer_.append(str, length);
+    }
+    bool append(const char16_t* begin, const char16_t* end) {
+        for (const char16_t* p = begin; p != end; p++)
+            processChar(*p);
+        return stringBuffer_.append(begin, end);
+    }
+    bool append(const char16_t* str, size_t length) {
+        return append(str, str + length);
+    }
+    template <size_t ArrayLength>
+    bool append(const char (&array)[ArrayLength]) {
+        static_assert(ArrayLength > 0, "null-terminated");
+        MOZ_ASSERT(array[ArrayLength - 1] == '\0');
+        return append(array, ArrayLength - 1);
+    }
+    char16_t getChar(size_t index) {
+        return stringBuffer_.getChar(index);
+    }
+    size_t length() {
+        return stringBuffer_.length();
+    }
+    StringBuffer& stringBuffer() { return stringBuffer_; }
+    uint32_t lineno() { return lineno_; }
+    uint32_t column() { return column_; }
+};
+
+}  // namespace wasm
+
+}  // namespace js
+
+#endif // namespace wasm_generated_source_map_h