Transform pattern:

  if (CGM.getModuleDebugInfo())
    DebugInfo = CGM.getModuleDebugInfo()
into a call:
  maybeInitializeDebugInfo();

This is a simplification for a possible future fix of PR13942.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@166019 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/CGBlocks.cpp

@@ -1001,8 +1001,7 @@ CodeGenFunction::GenerateBlockFunction(GlobalDecl GD,
   const BlockDecl *blockDecl = blockInfo.getBlockDecl();
 
   // Check if we should generate debug info for this block function.
-  if (CGM.getModuleDebugInfo())
-    DebugInfo = CGM.getModuleDebugInfo();
+  maybeInitializeDebugInfo();
   CurGD = GD;
   
   BlockInfo = &blockInfo;
@@ -1207,8 +1206,7 @@ CodeGenFunction::GenerateCopyHelperFunction(const CGBlockInfo &blockInfo) {
     = &CGM.getContext().Idents.get("__copy_helper_block_");
 
   // Check if we should generate debug info for this block helper function.
-  if (CGM.getModuleDebugInfo())
-    DebugInfo = CGM.getModuleDebugInfo();
+  maybeInitializeDebugInfo();
 
   FunctionDecl *FD = FunctionDecl::Create(C,
                                           C.getTranslationUnitDecl(),
@@ -1321,8 +1319,7 @@ CodeGenFunction::GenerateDestroyHelperFunction(const CGBlockInfo &blockInfo) {
                            "__destroy_helper_block_", &CGM.getModule());
 
   // Check if we should generate debug info for this block destroy function.
-  if (CGM.getModuleDebugInfo())
-    DebugInfo = CGM.getModuleDebugInfo();
+  maybeInitializeDebugInfo();
 
   IdentifierInfo *II
     = &CGM.getContext().Idents.get("__destroy_helper_block_");

lib/CodeGen/CGDeclCXX.cpp

@@ -321,8 +321,9 @@ void CodeGenFunction::GenerateCXXGlobalVarDeclInitFunc(llvm::Function *Fn,
                                                        const VarDecl *D,
                                                  llvm::GlobalVariable *Addr,
                                                        bool PerformInit) {
-  if (CGM.getModuleDebugInfo() && !D->hasAttr<NoDebugAttr>())
-    DebugInfo = CGM.getModuleDebugInfo();
+  // Check if we need to emit debug info for variable initializer.
+  if (!D->hasAttr<NoDebugAttr>())
+    maybeInitializeDebugInfo();
 
   StartFunction(GlobalDecl(D), getContext().VoidTy, Fn,
                 getTypes().arrangeNullaryFunction(),

lib/CodeGen/CGObjC.cpp

@@ -440,8 +440,8 @@ void CodeGenFunction::StartObjCMethod(const ObjCMethodDecl *OMD,
                                       SourceLocation StartLoc) {
   FunctionArgList args;
   // Check if we should generate debug info for this method.
-  if (CGM.getModuleDebugInfo() && !OMD->hasAttr<NoDebugAttr>())
-    DebugInfo = CGM.getModuleDebugInfo();
+  if (!OMD->hasAttr<NoDebugAttr>())
+    maybeInitializeDebugInfo();
 
   llvm::Function *Fn = CGM.getObjCRuntime().GenerateMethod(OMD, CD);
 
@@ -2830,9 +2830,8 @@ CodeGenFunction::GenerateObjCAtomicSetterCopyHelperFunction(
                            "__assign_helper_atomic_property_",
                            &CGM.getModule());
   
-  if (CGM.getModuleDebugInfo())
-    DebugInfo = CGM.getModuleDebugInfo();
-  
+  // Initialize debug info if needed.
+  maybeInitializeDebugInfo();
   
   StartFunction(FD, C.VoidTy, Fn, FI, args, SourceLocation());
   
@@ -2916,9 +2915,8 @@ CodeGenFunction::GenerateObjCAtomicGetterCopyHelperFunction(
   llvm::Function::Create(LTy, llvm::GlobalValue::InternalLinkage,
                          "__copy_helper_atomic_property_", &CGM.getModule());
   
-  if (CGM.getModuleDebugInfo())
-    DebugInfo = CGM.getModuleDebugInfo();
-  
+  // Initialize debug info if needed.
+  maybeInitializeDebugInfo();
   
   StartFunction(FD, C.VoidTy, Fn, FI, args, SourceLocation());
   

lib/CodeGen/CodeGenFunction.cpp

@@ -493,8 +493,8 @@ void CodeGenFunction::GenerateCode(GlobalDecl GD, llvm::Function *Fn,
   const FunctionDecl *FD = cast<FunctionDecl>(GD.getDecl());
   
   // Check if we should generate debug info for this function.
-  if (CGM.getModuleDebugInfo() && !FD->hasAttr<NoDebugAttr>())
-    DebugInfo = CGM.getModuleDebugInfo();
+  if (!FD->hasAttr<NoDebugAttr>())
+    maybeInitializeDebugInfo();
 
   FunctionArgList Args;
   QualType ResTy = FD->getResultType();

lib/CodeGen/CodeGenFunction.h

@@ -1212,6 +1212,14 @@ public:
 
   CodeGenTypes &getTypes() const { return CGM.getTypes(); }
   ASTContext &getContext() const { return CGM.getContext(); }
+  /// Returns true if DebugInfo is actually initialized.
+  bool maybeInitializeDebugInfo() {
+    if (CGM.getModuleDebugInfo()) {
+      DebugInfo = CGM.getModuleDebugInfo();
+      return true;
+    }
+    return false;
+  }
   CGDebugInfo *getDebugInfo() { 
     if (DisableDebugInfo) 
       return NULL;