[wasm] Implement official wasm text format

src/wasm/wasm-text.h

Index: src/wasm/wasm-text.h
diff --git a/src/wasm/wasm-text.h b/src/wasm/wasm-text.h
new file mode 100644
index 0000000000000000000000000000000000000000..41c0991ad4fe75ff4cf346c9cff770ad968fa91c
--- /dev/null
+++ b/src/wasm/wasm-text.h
@@ -0,0 +1,32 @@
+// Copyright 2016 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef V8_WASM_S_EXPR_H_
+#define V8_WASM_S_EXPR_H_
+
+#include <cstdint>
+#include <ostream>
+#include <tuple>
+#include <vector>
+
+namespace v8 {
+namespace internal {
+
+namespace wasm {
+
+// Forward declaration.
+struct WasmModule;
+
+// Generate disassembly according to official text format.
+// Output disassembly to the given output stream, and optionally return an
+// offset table of <byte offset, line, column> via the given pointer.
+void PrintWasmText(const WasmModule *module, uint32_t func_index,
+                   std::ostream &os,
+                   std::vector<std::tuple<uint32_t, int, int>> *offset_table);
+
+}  // namespace wasm
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_WASM_S_EXPR_H_