[wasm] Add functionality to decode a function offset table

src/wasm/wasm-module.h

Index: src/wasm/wasm-module.h
diff --git a/src/wasm/wasm-module.h b/src/wasm/wasm-module.h
index 1da17ba91d51837344b4b8e8e27a70606913abda..474cb42985da8cf1aad082e6272eda62b7f85ce4 100644
--- a/src/wasm/wasm-module.h
+++ b/src/wasm/wasm-module.h
@@ -305,8 +305,10 @@ std::ostream& operator<<(std::ostream& os, const WasmModule& module);
 std::ostream& operator<<(std::ostream& os, const WasmFunction& function);
 std::ostream& operator<<(std::ostream& os, const WasmFunctionName& name);
 
-typedef Result<const WasmModule*> ModuleResult;
-typedef Result<WasmFunction*> FunctionResult;
+using ModuleResult = Result<const WasmModule*>;

[titzer, 2016/06/10 11:20:05]

You can just use a typedef for these, since they are semantically equivalent.
IIUC, this using syntax is only useful when template typedefs are involved.

Let's stick with typedef and if we want to use the "using" syntax, update all of
them at the same time.

[Clemens Hammacher, 2016/06/16 08:14:18]

Done.

+using FunctionResult = Result<WasmFunction*>;
+using FunctionOffsets = std::vector<std::pair<int, int>>;
+using FunctionOffsetsResult = Result<FunctionOffsets>;
 
 // For testing. Decode, verify, and run the last exported function in the
 // given encoded module.