[PATCH] PR5172: Fix for a bug in pragma redefine_extname implementation.

Andrey Bokhanko andreybokhanko at gmail.com
Tue Jun 9 08:38:40 PDT 2015


Patch updated according to Richard Smith's comments (from http://lists.cs.uiuc.edu/pipermail/cfe-commits/Week-of-Mon-20150608/130447.html).


http://reviews.llvm.org/D10187

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

Index: test/CodeGen/redefine_extname.cpp
===================================================================
--- test/CodeGen/redefine_extname.cpp
+++ test/CodeGen/redefine_extname.cpp
@@ -0,0 +1,18 @@
+// RUN: %clang_cc1 -triple=i386-pc-solaris2.11 -w -emit-llvm %s -o - | FileCheck %s
+
+extern "C" {
+  struct statvfs64 {
+    int f;
+  };
+#pragma redefine_extname statvfs64 statvfs
+  int statvfs64(struct statvfs64 *);
+}
+
+void foo() {
+  struct statvfs64 st;
+  statvfs64(&st);
+// Check that even if there is a structure with redefined name before the
+// pragma, subsequent function name redefined properly. PR5172, Comment 11.
+// CHECK:  call i32 @statvfs(%struct.statvfs64* %st)
+}
+
Index: lib/Sema/SemaDecl.cpp
===================================================================
--- lib/Sema/SemaDecl.cpp
+++ lib/Sema/SemaDecl.cpp
@@ -14197,16 +14197,22 @@
                                       SourceLocation PragmaLoc,
                                       SourceLocation NameLoc,
                                       SourceLocation AliasNameLoc) {
-  Decl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc,
-                                    LookupOrdinaryName);
-  AsmLabelAttr *Attr = ::new (Context) AsmLabelAttr(AliasNameLoc, Context,
-                                                    AliasName->getName(), 0);
-
-  if (PrevDecl) 
+  NamedDecl *PrevDecl = LookupSingleName(TUScope, Name, NameLoc,
+                                         LookupOrdinaryName);
+  AsmLabelAttr *Attr =
+      AsmLabelAttr::CreateImplicit(Context, AliasName->getName(), AliasNameLoc);
+
+  // If a declaration that:
+  // 1) declares a function or a variable
+  // 2) has external linkage
+  // already exists, add a label attribute to it.
+  if (PrevDecl &&
+      (isa<FunctionDecl>(PrevDecl) || isa<VarDecl>(PrevDecl)) &&
+      PrevDecl->hasExternalFormalLinkage())
     PrevDecl->addAttr(Attr);
-  else 
-    (void)ExtnameUndeclaredIdentifiers.insert(
-      std::pair<IdentifierInfo*,AsmLabelAttr*>(Name, Attr));
+  // Otherwise, add a label atttibute to ExtnameUndeclaredIdentifiers.
+  else
+    (void)ExtnameUndeclaredIdentifiers.insert(std::make_pair(Name, Attr));
 }
 
 void Sema::ActOnPragmaWeakID(IdentifierInfo* Name,

EMAIL PREFERENCES
  http://reviews.llvm.org/settings/panel/emailpreferences/
-------------- next part --------------
A non-text attachment was scrubbed...
Name: D10187.27378.patch
Type: text/x-patch
Size: 2247 bytes
Desc: not available
URL: <http://lists.llvm.org/pipermail/cfe-commits/attachments/20150609/27742b92/attachment.bin>


More information about the cfe-commits mailing list