[PATCH] D111086: [WebAssembly] Remove WasmTagType

[Sam Clegg via Phabricator via llvm-commits]

sbc100 added inline comments.


================
Comment at: lld/wasm/InputFiles.cpp:499
   ArrayRef<uint32_t> funcTypes = wasmObj->functionTypes();
+  ArrayRef<uint32_t> tagTypes = wasmObj->tagTypes();
   ArrayRef<WasmSignature> types = wasmObj->types();
----------------
aheejin wrote:
> sbc100 wrote:
> > Why have a separate  `tagTypes()` method?  Wouldn't be better just add `Type` o `Sig` to `struct WasmTag`? 
> It's not an inherently property of `Tag` and will become invalidate at linking time. This is the same as how we handle function types now; see one line above.
Just because its going to be re-written/updated by the linker doesn't mean the libObject interface should not expose it directly as part of the Tag.

I'm trying to remember why `functionTypes` is not part simply embedded the `WasmFunction` array.    Perhaps because there are function types for imported functions as well as defined ones?     Actually that is not true since imported functions *do* embed thier signature:

```
struct WasmImport {                                                                                               
  StringRef Module;                                                              
  StringRef Field;                                                               
  uint8_t Kind;                                                                  
  union {                                                                        
    uint32_t SigIndex;                 <--- here                                             
    WasmGlobalType Global;                                                       
    WasmTableType Table;                                                         
    WasmLimits Memory;                                                           
    WasmTagType Tag;                                                             
  };                                                                             
};    
```

Unless there is some other reason to keep tagTypes separate I suggest you simply embed it them.


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D111086/new/

https://reviews.llvm.org/D111086