[PATCH] D87666: [lld][WebAssembly] Allow globals imports via import_name/import_module

[Sam Clegg via Phabricator via llvm-commits]

sbc100 created this revision.
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This feature already exists but was limited to function
symbols.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D87666

Files:
  lld/test/wasm/mutable-globals.s
  lld/wasm/Relocations.cpp


Index: lld/wasm/Relocations.cpp
===================================================================
--- lld/wasm/Relocations.cpp
+++ lld/wasm/Relocations.cpp
@@ -21,11 +21,14 @@
 }
 
 static bool allowUndefined(const Symbol* sym) {
-  // Undefined functions with explicit import name are allowed to be undefined
-  // at link time.
+  // Undefined functions and globals with explicit import name are allowed to be
+  // undefined at link time.
   if (auto *F = dyn_cast<UndefinedFunction>(sym))
     if (F->importName)
       return true;
+  if (auto *G = dyn_cast<UndefinedGlobal>(sym))
+    if (G->importName)
+      return true;
   return (config->allowUndefined ||
           config->allowUndefinedSymbols.count(sym->getName()) != 0);
 }
Index: lld/test/wasm/mutable-globals.s
===================================================================
--- lld/test/wasm/mutable-globals.s
+++ lld/test/wasm/mutable-globals.s
@@ -9,5 +9,7 @@
   end_function
 
 .globaltype foo, i32
+.import_module foo, env
+.import_name foo, foo
 
 # CHECK: error: mutable global imported but 'mutable-globals' feature not present in inputs: `foo`. Use --no-check-features to suppress.


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