From f4a3e28941ed4c5d03e77cd90330b90869f59e33 Mon Sep 17 00:00:00 2001
From: Alp Toker <alp@nuanti.com>
Date: Tue, 3 Jun 2014 02:13:57 +0000
Subject: [PATCH] Eliminate redundant MangleBuffer class

The only remaining user didn't actually use the non-dynamic storage facility
this class provides.

The std::string is transitional and likely to be StringRefized shortly.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@210058 91177308-0d34-0410-b5e6-96231b3b80d8
---
 include/clang/AST/Mangle.h    | 27 ---------------------------
 lib/CodeGen/CGBlocks.cpp      |  8 +++-----
 lib/CodeGen/CGDecl.cpp        |  7 ++-----
 lib/CodeGen/CodeGenModule.cpp | 10 +++++++---
 lib/CodeGen/CodeGenModule.h   |  4 +---
 5 files changed, 13 insertions(+), 43 deletions(-)

diff --git a/include/clang/AST/Mangle.h b/include/clang/AST/Mangle.h
index e740836bb2..a8d119971b 100644
--- a/include/clang/AST/Mangle.h
+++ b/include/clang/AST/Mangle.h
@@ -36,33 +36,6 @@ namespace clang {
   struct ThunkInfo;
   class VarDecl;
 
-/// MangleBuffer - a convenient class for storing a name which is
-/// either the result of a mangling or is a constant string with
-/// external memory ownership.
-class MangleBuffer {
-public:
-  void setString(StringRef Ref) {
-    String = Ref;
-  }
-
-  SmallVectorImpl<char> &getBuffer() {
-    return Buffer;
-  }
-
-  StringRef getString() const {
-    if (!String.empty()) return String;
-    return Buffer.str();
-  }
-
-  operator StringRef() const {
-    return getString();
-  }
-
-private:
-  StringRef String;
-  SmallString<256> Buffer;
-};
-
 /// MangleContext - Context for tracking state which persists across multiple
 /// calls to the C++ name mangler.
 class MangleContext {
diff --git a/lib/CodeGen/CGBlocks.cpp b/lib/CodeGen/CGBlocks.cpp
index 21896da349..71a2447cb5 100644
--- a/lib/CodeGen/CGBlocks.cpp
+++ b/lib/CodeGen/CGBlocks.cpp
@@ -1127,11 +1127,9 @@ CodeGenFunction::GenerateBlockFunction(GlobalDecl GD,
 
   llvm::FunctionType *fnLLVMType = CGM.getTypes().GetFunctionType(fnInfo);
 
-  MangleBuffer name;
-  CGM.getBlockMangledName(GD, name, blockDecl);
-  llvm::Function *fn =
-    llvm::Function::Create(fnLLVMType, llvm::GlobalValue::InternalLinkage, 
-                           name.getString(), &CGM.getModule());
+  std::string name = CGM.getBlockMangledName(GD, blockDecl);
+  llvm::Function *fn = llvm::Function::Create(
+      fnLLVMType, llvm::GlobalValue::InternalLinkage, name, &CGM.getModule());
   CGM.SetInternalFunctionAttributes(blockDecl, fn, fnInfo);
 
   // Begin generating the function.
diff --git a/lib/CodeGen/CGDecl.cpp b/lib/CodeGen/CGDecl.cpp
index 1869c1c27a..7cf9cb2417 100644
--- a/lib/CodeGen/CGDecl.cpp
+++ b/lib/CodeGen/CGDecl.cpp
@@ -159,11 +159,8 @@ static std::string GetStaticDeclName(CodeGenFunction &CGF, const VarDecl &D,
     // Better be in a block declared in global scope.
     const NamedDecl *ND = cast<NamedDecl>(&D);
     const DeclContext *DC = ND->getDeclContext();
-    if (const BlockDecl *BD = dyn_cast<BlockDecl>(DC)) {
-      MangleBuffer Name;
-      CGM.getBlockMangledName(GlobalDecl(), Name, BD);
-      ContextName = Name.getString();
-    }
+    if (const BlockDecl *BD = dyn_cast<BlockDecl>(DC))
+      ContextName = CGM.getBlockMangledName(GlobalDecl(), BD);
     else
       llvm_unreachable("Unknown context for block static var decl");
   } else if (const FunctionDecl *FD = dyn_cast<FunctionDecl>(CGF.CurFuncDecl)) {
diff --git a/lib/CodeGen/CodeGenModule.cpp b/lib/CodeGen/CodeGenModule.cpp
index f42e67de0e..b0e08a2c65 100644
--- a/lib/CodeGen/CodeGenModule.cpp
+++ b/lib/CodeGen/CodeGenModule.cpp
@@ -489,11 +489,13 @@ StringRef CodeGenModule::getMangledName(GlobalDecl GD) {
   return Str;
 }
 
-void CodeGenModule::getBlockMangledName(GlobalDecl GD, MangleBuffer &Buffer,
-                                        const BlockDecl *BD) {
+std::string CodeGenModule::getBlockMangledName(GlobalDecl GD,
+                                               const BlockDecl *BD) {
   MangleContext &MangleCtx = getCXXABI().getMangleContext();
   const Decl *D = GD.getDecl();
-  llvm::raw_svector_ostream Out(Buffer.getBuffer());
+
+  std::string Buffer;
+  llvm::raw_string_ostream Out(Buffer);
   if (!D)
     MangleCtx.mangleGlobalBlock(BD, 
       dyn_cast_or_null<VarDecl>(initializedGlobalDecl.getDecl()), Out);
@@ -503,6 +505,8 @@ void CodeGenModule::getBlockMangledName(GlobalDecl GD, MangleBuffer &Buffer,
     MangleCtx.mangleDtorBlock(DD, GD.getDtorType(), BD, Out);
   else
     MangleCtx.mangleBlock(cast<DeclContext>(D), BD, Out);
+
+  return Out.str();
 }
 
 llvm::GlobalValue *CodeGenModule::GetGlobalValue(StringRef Name) {
diff --git a/lib/CodeGen/CodeGenModule.h b/lib/CodeGen/CodeGenModule.h
index c54f6dea52..ef18957e3d 100644
--- a/lib/CodeGen/CodeGenModule.h
+++ b/lib/CodeGen/CodeGenModule.h
@@ -71,7 +71,6 @@ class CodeGenOptions;
 class DiagnosticsEngine;
 class AnnotateAttr;
 class CXXDestructorDecl;
-class MangleBuffer;
 class Module;
 
 namespace CodeGen {
@@ -937,8 +936,7 @@ public:
                               bool AttrOnCallSite);
 
   StringRef getMangledName(GlobalDecl GD);
-  void getBlockMangledName(GlobalDecl GD, MangleBuffer &Buffer,
-                           const BlockDecl *BD);
+  std::string getBlockMangledName(GlobalDecl GD, const BlockDecl *BD);
 
   void EmitTentativeDefinition(const VarDecl *D);
 
-- 
2.40.0