[x86] Exclusion of incorrect include headers paths for MCU target

Exclusion of /usr/include and /usr/local/include headers paths for MCU target.

Differential Revision: http://reviews.llvm.org/D14954

llvm-svn: 254195

1 files changed, 52 insertions, 17 deletions

diff --git a/clang/lib/CodeGen/CodeGenModule.cpp b/clang/lib/CodeGen/CodeGenModule.cpp
index b587783..042984a 100644
--- a/clang/lib/CodeGen/CodeGenModule.cpp
+++ b/clang/lib/CodeGen/CodeGenModule.cpp
@@ -1178,12 +1178,7 @@ void CodeGenModule::EmitDeferred() {
     // to get GlobalValue with exactly the type we need, not something that
     // might had been created for another decl with the same mangled name but
     // different type.
-    // FIXME: Support for variables is not implemented yet.
-    if (isa<FunctionDecl>(D.getDecl()))
-      GV = cast<llvm::GlobalValue>(GetAddrOfGlobal(D, /*IsForDefinition=*/true));
-    else
-      if (!GV)
-        GV = GetGlobalValue(getMangledName(D));
+    GV = cast<llvm::GlobalValue>(GetAddrOfGlobal(D, /*IsForDefinition=*/true));
 
     // Check to see if we've already emitted this.  This is necessary
     // for a couple of reasons: first, decls can end up in the
@@ -1693,8 +1688,8 @@ CodeGenModule::GetOrCreateLLVMFunction(StringRef MangledName,
     // error.
     if (IsForDefinition && !Entry->isDeclaration()) {
       GlobalDecl OtherGD;
-      // Check that GD is not yet in ExplicitDefinitions is required to make
-      // sure that we issue an error only once.
+      // Check that GD is not yet in DiagnosedConflictingDefinitions is required
+      // to make sure that we issue an error only once.
       if (lookupRepresentativeDecl(MangledName, OtherGD) &&
           (GD.getCanonicalDecl().getDecl() !=
            OtherGD.getCanonicalDecl().getDecl()) &&
@@ -1904,7 +1899,8 @@ bool CodeGenModule::isTypeConstant(QualType Ty, bool ExcludeCtor) {
 llvm::Constant *
 CodeGenModule::GetOrCreateLLVMGlobal(StringRef MangledName,
                                      llvm::PointerType *Ty,
-                                     const VarDecl *D) {
+                                     const VarDecl *D,
+                                     bool IsForDefinition) {
   // Lookup the entry, lazily creating it if necessary.
   llvm::GlobalValue *Entry = GetGlobalValue(MangledName);
   if (Entry) {
@@ -1920,11 +1916,31 @@ CodeGenModule::GetOrCreateLLVMGlobal(StringRef MangledName,
     if (Entry->getType() == Ty)
       return Entry;
 
+    // If there are two attempts to define the same mangled name, issue an
+    // error.
+    if (IsForDefinition && !Entry->isDeclaration()) {
+      GlobalDecl OtherGD;
+      // Check that D is not yet in DiagnosedConflictingDefinitions is required
+      // to make sure that we issue an error only once.
+      if (lookupRepresentativeDecl(MangledName, OtherGD) &&
+          (D->getCanonicalDecl() != OtherGD.getCanonicalDecl().getDecl()) &&
+          DiagnosedConflictingDefinitions.insert(D).second) {
+        getDiags().Report(D->getLocation(),
+                          diag::err_duplicate_mangled_name);
+        getDiags().Report(OtherGD.getDecl()->getLocation(),
+                          diag::note_previous_definition);
+      }
+    }
+
     // Make sure the result is of the correct type.
     if (Entry->getType()->getAddressSpace() != Ty->getAddressSpace())
       return llvm::ConstantExpr::getAddrSpaceCast(Entry, Ty);
 
-    return llvm::ConstantExpr::getBitCast(Entry, Ty);
+    // Make sure the result is of the correct type.
+    // (If global is requested for a definition, we always need to create a new
+    // global, not just return a bitcast.)
+    if (!IsForDefinition)
+      return llvm::ConstantExpr::getBitCast(Entry, Ty);
   }
 
   unsigned AddrSpace = GetGlobalVarAddressSpace(D, Ty->getAddressSpace());
@@ -1933,6 +1949,20 @@ CodeGenModule::GetOrCreateLLVMGlobal(StringRef MangledName,
       llvm::GlobalValue::ExternalLinkage, nullptr, MangledName, nullptr,
       llvm::GlobalVariable::NotThreadLocal, AddrSpace);
 
+  // If we already created a global with the same mangled name (but different
+  // type) before, take its name and remove it from its parent.
+  if (Entry) {
+    GV->takeName(Entry);
+
+    if (!Entry->use_empty()) {
+      llvm::Constant *NewPtrForOldDecl =
+      llvm::ConstantExpr::getBitCast(GV, Entry->getType());
+      Entry->replaceAllUsesWith(NewPtrForOldDecl);
+    }
+
+    Entry->eraseFromParent();
+  }
+
   // This is the first use or definition of a mangled name.  If there is a
   // deferred decl with this name, remember that we need to emit it at the end
   // of the file.
@@ -2005,7 +2035,8 @@ CodeGenModule::GetAddrOfGlobal(GlobalDecl GD,
     return GetAddrOfFunction(GD, Ty, /*ForVTable=*/false, /*DontDefer=*/false,
                              IsForDefinition);
   } else
-    return GetAddrOfGlobalVar(cast<VarDecl>(GD.getDecl()));
+    return GetAddrOfGlobalVar(cast<VarDecl>(GD.getDecl()), /*Ty=*/nullptr,
+                              IsForDefinition);
 }
 
 llvm::GlobalVariable *
@@ -2055,7 +2086,8 @@ CodeGenModule::CreateOrReplaceCXXRuntimeVariable(StringRef Name,
 /// then it will be created with the specified type instead of whatever the
 /// normal requested type would be.
 llvm::Constant *CodeGenModule::GetAddrOfGlobalVar(const VarDecl *D,
-                                                  llvm::Type *Ty) {
+                                                  llvm::Type *Ty,
+                                                  bool IsForDefinition) {
   assert(D->hasGlobalStorage() && "Not a global variable");
   QualType ASTTy = D->getType();
   if (!Ty)
@@ -2065,7 +2097,7 @@ llvm::Constant *CodeGenModule::GetAddrOfGlobalVar(const VarDecl *D,
     llvm::PointerType::get(Ty, getContext().getTargetAddressSpace(ASTTy));
 
   StringRef MangledName = getMangledName(D);
-  return GetOrCreateLLVMGlobal(MangledName, PTy, D);
+  return GetOrCreateLLVMGlobal(MangledName, PTy, D, IsForDefinition);
 }
 
 /// CreateRuntimeVariable - Create a new runtime global variable with the
@@ -2091,7 +2123,7 @@ void CodeGenModule::EmitTentativeDefinition(const VarDecl *D) {
   }
 
   // The tentative definition is the only definition.
-  EmitGlobalVarDefinition(D);
+  EmitGlobalVarDefinition(D, true);
 }
 
 CharUnits CodeGenModule::GetTargetTypeStoreSize(llvm::Type *Ty) const {
@@ -2178,7 +2210,8 @@ void CodeGenModule::maybeSetTrivialComdat(const Decl &D,
   GO.setComdat(TheModule.getOrInsertComdat(GO.getName()));
 }
 
-void CodeGenModule::EmitGlobalVarDefinition(const VarDecl *D) {
+void CodeGenModule::EmitGlobalVarDefinition(const VarDecl *D,
+                                            bool IsTentative) {
   llvm::Constant *Init = nullptr;
   QualType ASTTy = D->getType();
   CXXRecordDecl *RD = ASTTy->getBaseElementTypeUnsafe()->getAsCXXRecordDecl();
@@ -2237,7 +2270,8 @@ void CodeGenModule::EmitGlobalVarDefinition(const VarDecl *D) {
   }
 
   llvm::Type* InitType = Init->getType();
-  llvm::Constant *Entry = GetAddrOfGlobalVar(D, InitType);
+  llvm::Constant *Entry =
+      GetAddrOfGlobalVar(D, InitType, /*IsForDefinition=*/!IsTentative);
 
   // Strip off a bitcast if we got one back.
   if (auto *CE = dyn_cast<llvm::ConstantExpr>(Entry)) {
@@ -2269,7 +2303,8 @@ void CodeGenModule::EmitGlobalVarDefinition(const VarDecl *D) {
     Entry->setName(StringRef());
 
     // Make a new global with the correct type, this is now guaranteed to work.
-    GV = cast<llvm::GlobalVariable>(GetAddrOfGlobalVar(D, InitType));
+    GV = cast<llvm::GlobalVariable>(
+        GetAddrOfGlobalVar(D, InitType, /*IsForDefinition=*/!IsTentative));
 
     // Replace all uses of the old global with the new global
     llvm::Constant *NewPtrForOldDecl =