[PATCH] PR23923: "redefine_extname" pragma handled incorrectly in case of a local var with the same name

[Andrey Bokhanko]

Patch updated in response to Aaron Ballman's comments (http://lists.cs.uiuc.edu/pipermail/cfe-commits/Week-of-Mon-20150622/131538.html).


http://reviews.llvm.org/D10646

Files:
  lib/Sema/SemaDecl.cpp
  test/CodeGen/redefine_extname.c

Index: test/CodeGen/redefine_extname.c
===================================================================
--- test/CodeGen/redefine_extname.c
+++ test/CodeGen/redefine_extname.c
@@ -13,3 +13,14 @@
 // CHECK:   call i32 @real()
 // Check that this also works with variables names
 // CHECK:   load i32, i32* @alias
+
+// This is a case when redefenition is deferred *and* we have a local of the
+// same name. PR23923.
+#pragma redefine_extname foo bar
+int f() {
+  int foo = 0;
+  return foo;
+}
+extern int foo() { return 1; }
+// CHECK: define i32 @bar()
+
Index: lib/Sema/SemaDecl.cpp
===================================================================
--- lib/Sema/SemaDecl.cpp
+++ lib/Sema/SemaDecl.cpp
@@ -5522,6 +5522,18 @@
   return true;
 }
 
+/// \brief Returns true if given declaration is TU-scoped and externally visible
+static bool isDeclTUScopedExternallyVisible(Decl *Decl) {
+  if (auto *FD = dyn_cast<FunctionDecl>(Decl))
+    return (FD->getDeclContext()->isTranslationUnit() || FD->isExternC()) &&
+           FD->hasExternalFormalLinkage();
+  else if (auto *VD = dyn_cast<VarDecl>(Decl))
+    return (VD->getDeclContext()->isTranslationUnit() || VD->isExternC()) &&
+           VD->hasExternalFormalLinkage();
+  else
+    llvm_unreachable("Unknown type of decl!");
+}
+
 NamedDecl *
 Sema::ActOnVariableDeclarator(Scope *S, Declarator &D, DeclContext *DC,
                               TypeSourceInfo *TInfo, LookupResult &Previous,
@@ -5946,7 +5958,8 @@
 
     NewVD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0),
                                                 Context, Label, 0));
-  } else if (!ExtnameUndeclaredIdentifiers.empty()) {
+  } else if (!ExtnameUndeclaredIdentifiers.empty() &&
+             isDeclTUScopedExternallyVisible(NewVD)) {
     llvm::DenseMap<IdentifierInfo*,AsmLabelAttr*>::iterator I =
       ExtnameUndeclaredIdentifiers.find(NewVD->getIdentifier());
     if (I != ExtnameUndeclaredIdentifiers.end()) {
@@ -7468,7 +7481,8 @@
     StringLiteral *SE = cast<StringLiteral>(E);
     NewFD->addAttr(::new (Context) AsmLabelAttr(SE->getStrTokenLoc(0), Context,
                                                 SE->getString(), 0));
-  } else if (!ExtnameUndeclaredIdentifiers.empty()) {
+  } else if (!ExtnameUndeclaredIdentifiers.empty() &&
+             isDeclTUScopedExternallyVisible(NewFD)) {
     llvm::DenseMap<IdentifierInfo*,AsmLabelAttr*>::iterator I =
       ExtnameUndeclaredIdentifiers.find(NewFD->getIdentifier());
     if (I != ExtnameUndeclaredIdentifiers.end()) {

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