Pass ConstString by value (NFC)

My apologies for the large patch. With the exception of ConstString.h
itself it was entirely produced by sed.

ConstString has exactly one const char * data member, so passing a
ConstString by reference is not any more efficient than copying it by
value. In both cases a single pointer is passed. But passing it by
value makes it harder to accidentally return the address of a local
object.

(This fixes rdar://problem/48640859 for the Apple folks)

Differential Revision: https://reviews.llvm.org/D59030

llvm-svn: 355553
diff --git a/lldb/source/Plugins/Language/CPlusPlus/BlockPointer.cpp b/lldb/source/Plugins/Language/CPlusPlus/BlockPointer.cpp
index 6086aff..87b5b59 100644
--- a/lldb/source/Plugins/Language/CPlusPlus/BlockPointer.cpp
+++ b/lldb/source/Plugins/Language/CPlusPlus/BlockPointer.cpp
@@ -149,7 +149,7 @@
   // maybe return false if the block pointer is, say, null
   bool MightHaveChildren() override { return true; }
 
-  size_t GetIndexOfChildWithName(const ConstString &name) override {
+  size_t GetIndexOfChildWithName(ConstString name) override {
     if (!m_block_struct_type.IsValid())
       return UINT32_MAX;
 
diff --git a/lldb/source/Plugins/Language/CPlusPlus/CPlusPlusLanguage.h b/lldb/source/Plugins/Language/CPlusPlus/CPlusPlusLanguage.h
index 70a00c0..c6792e9 100644
--- a/lldb/source/Plugins/Language/CPlusPlus/CPlusPlusLanguage.h
+++ b/lldb/source/Plugins/Language/CPlusPlus/CPlusPlusLanguage.h
@@ -31,7 +31,7 @@
         : m_full(), m_basename(), m_context(), m_arguments(), m_qualifiers(),
           m_parsed(false), m_parse_error(false) {}
 
-    MethodName(const ConstString &s)
+    MethodName(ConstString s)
         : m_full(s), m_basename(), m_context(), m_arguments(), m_qualifiers(),
           m_parsed(false), m_parse_error(false) {}
 
@@ -45,7 +45,7 @@
       return (bool)m_full;
     }
 
-    const ConstString &GetFullName() const { return m_full; }
+    ConstString GetFullName() const { return m_full; }
 
     std::string GetScopeQualifiedName();
 
diff --git a/lldb/source/Plugins/Language/CPlusPlus/LibCxx.cpp b/lldb/source/Plugins/Language/CPlusPlus/LibCxx.cpp
index 15d3491..e63452e 100644
--- a/lldb/source/Plugins/Language/CPlusPlus/LibCxx.cpp
+++ b/lldb/source/Plugins/Language/CPlusPlus/LibCxx.cpp
@@ -299,7 +299,7 @@
 }
 
 size_t lldb_private::formatters::LibCxxMapIteratorSyntheticFrontEnd::
-    GetIndexOfChildWithName(const ConstString &name) {
+    GetIndexOfChildWithName(ConstString name) {
   if (name == ConstString("first"))
     return 0;
   if (name == ConstString("second"))
@@ -429,7 +429,7 @@
 }
 
 size_t lldb_private::formatters::LibcxxSharedPtrSyntheticFrontEnd::
-    GetIndexOfChildWithName(const ConstString &name) {
+    GetIndexOfChildWithName(ConstString name) {
   if (name == ConstString("__ptr_"))
     return 0;
   if (name == ConstString("count"))
diff --git a/lldb/source/Plugins/Language/CPlusPlus/LibCxx.h b/lldb/source/Plugins/Language/CPlusPlus/LibCxx.h
index 4b88159..214f551 100644
--- a/lldb/source/Plugins/Language/CPlusPlus/LibCxx.h
+++ b/lldb/source/Plugins/Language/CPlusPlus/LibCxx.h
@@ -66,7 +66,7 @@
 
   bool MightHaveChildren() override;
 
-  size_t GetIndexOfChildWithName(const ConstString &name) override;
+  size_t GetIndexOfChildWithName(ConstString name) override;
 
   ~LibCxxMapIteratorSyntheticFrontEnd() override;
 
@@ -95,7 +95,7 @@
 
   bool MightHaveChildren() override;
 
-  size_t GetIndexOfChildWithName(const ConstString &name) override;
+  size_t GetIndexOfChildWithName(ConstString name) override;
 
   ~LibcxxSharedPtrSyntheticFrontEnd() override;
 
diff --git a/lldb/source/Plugins/Language/CPlusPlus/LibCxxAtomic.cpp b/lldb/source/Plugins/Language/CPlusPlus/LibCxxAtomic.cpp
index f9f79c5..b4e7a17 100644
--- a/lldb/source/Plugins/Language/CPlusPlus/LibCxxAtomic.cpp
+++ b/lldb/source/Plugins/Language/CPlusPlus/LibCxxAtomic.cpp
@@ -99,7 +99,7 @@
 
   bool MightHaveChildren() override;
 
-  size_t GetIndexOfChildWithName(const ConstString &name) override;
+  size_t GetIndexOfChildWithName(ConstString name) override;
 
   lldb::ValueObjectSP GetSyntheticValue() override;
 
@@ -138,7 +138,7 @@
 }
 
 size_t lldb_private::formatters::LibcxxStdAtomicSyntheticFrontEnd::
-    GetIndexOfChildWithName(const ConstString &name) {
+    GetIndexOfChildWithName(ConstString name) {
   return m_real_child ? m_real_child->GetIndexOfChildWithName(name)
                       : UINT32_MAX;
 }
diff --git a/lldb/source/Plugins/Language/CPlusPlus/LibCxxBitset.cpp b/lldb/source/Plugins/Language/CPlusPlus/LibCxxBitset.cpp
index 440f359..815dafb 100644
--- a/lldb/source/Plugins/Language/CPlusPlus/LibCxxBitset.cpp
+++ b/lldb/source/Plugins/Language/CPlusPlus/LibCxxBitset.cpp
@@ -20,7 +20,7 @@
 public:
   BitsetFrontEnd(ValueObject &valobj);
 
-  size_t GetIndexOfChildWithName(const ConstString &name) override {
+  size_t GetIndexOfChildWithName(ConstString name) override {
     return formatters::ExtractIndexFromString(name.GetCString());
   }
 
diff --git a/lldb/source/Plugins/Language/CPlusPlus/LibCxxInitializerList.cpp b/lldb/source/Plugins/Language/CPlusPlus/LibCxxInitializerList.cpp
index 27eca9e..79c7434 100644
--- a/lldb/source/Plugins/Language/CPlusPlus/LibCxxInitializerList.cpp
+++ b/lldb/source/Plugins/Language/CPlusPlus/LibCxxInitializerList.cpp
@@ -33,7 +33,7 @@
 
   bool MightHaveChildren() override;
 
-  size_t GetIndexOfChildWithName(const ConstString &name) override;
+  size_t GetIndexOfChildWithName(ConstString name) override;
 
 private:
   ValueObject *m_start;
@@ -108,7 +108,7 @@
 }
 
 size_t lldb_private::formatters::LibcxxInitializerListSyntheticFrontEnd::
-    GetIndexOfChildWithName(const ConstString &name) {
+    GetIndexOfChildWithName(ConstString name) {
   if (!m_start)
     return UINT32_MAX;
   return ExtractIndexFromString(name.GetCString());
diff --git a/lldb/source/Plugins/Language/CPlusPlus/LibCxxList.cpp b/lldb/source/Plugins/Language/CPlusPlus/LibCxxList.cpp
index ba47e22..d375cc2 100644
--- a/lldb/source/Plugins/Language/CPlusPlus/LibCxxList.cpp
+++ b/lldb/source/Plugins/Language/CPlusPlus/LibCxxList.cpp
@@ -111,7 +111,7 @@
 
 class AbstractListFrontEnd : public SyntheticChildrenFrontEnd {
 public:
-  size_t GetIndexOfChildWithName(const ConstString &name) override {
+  size_t GetIndexOfChildWithName(ConstString name) override {
     return ExtractIndexFromString(name.GetCString());
   }
   bool MightHaveChildren() override { return true; }
diff --git a/lldb/source/Plugins/Language/CPlusPlus/LibCxxMap.cpp b/lldb/source/Plugins/Language/CPlusPlus/LibCxxMap.cpp
index ad23fc7..619c718 100644
--- a/lldb/source/Plugins/Language/CPlusPlus/LibCxxMap.cpp
+++ b/lldb/source/Plugins/Language/CPlusPlus/LibCxxMap.cpp
@@ -184,7 +184,7 @@
 
   bool MightHaveChildren() override;
 
-  size_t GetIndexOfChildWithName(const ConstString &name) override;
+  size_t GetIndexOfChildWithName(ConstString name) override;
 
 private:
   bool GetDataType();
@@ -452,7 +452,7 @@
 }
 
 size_t lldb_private::formatters::LibcxxStdMapSyntheticFrontEnd::
-    GetIndexOfChildWithName(const ConstString &name) {
+    GetIndexOfChildWithName(ConstString name) {
   return ExtractIndexFromString(name.GetCString());
 }
 
diff --git a/lldb/source/Plugins/Language/CPlusPlus/LibCxxOptional.cpp b/lldb/source/Plugins/Language/CPlusPlus/LibCxxOptional.cpp
index 7ae251b..1160215 100644
--- a/lldb/source/Plugins/Language/CPlusPlus/LibCxxOptional.cpp
+++ b/lldb/source/Plugins/Language/CPlusPlus/LibCxxOptional.cpp
@@ -20,7 +20,7 @@
     Update();
   }
 
-  size_t GetIndexOfChildWithName(const ConstString &name) override {
+  size_t GetIndexOfChildWithName(ConstString name) override {
     return formatters::ExtractIndexFromString(name.GetCString());
   }
 
diff --git a/lldb/source/Plugins/Language/CPlusPlus/LibCxxQueue.cpp b/lldb/source/Plugins/Language/CPlusPlus/LibCxxQueue.cpp
index 8401e2f..4b72089 100644
--- a/lldb/source/Plugins/Language/CPlusPlus/LibCxxQueue.cpp
+++ b/lldb/source/Plugins/Language/CPlusPlus/LibCxxQueue.cpp
@@ -20,7 +20,7 @@
     Update();
   }
 
-  size_t GetIndexOfChildWithName(const ConstString &name) override {
+  size_t GetIndexOfChildWithName(ConstString name) override {
     return m_container_sp ? m_container_sp->GetIndexOfChildWithName(name)
                           : UINT32_MAX;
   }
diff --git a/lldb/source/Plugins/Language/CPlusPlus/LibCxxTuple.cpp b/lldb/source/Plugins/Language/CPlusPlus/LibCxxTuple.cpp
index 276b703..8da7460 100644
--- a/lldb/source/Plugins/Language/CPlusPlus/LibCxxTuple.cpp
+++ b/lldb/source/Plugins/Language/CPlusPlus/LibCxxTuple.cpp
@@ -20,7 +20,7 @@
     Update();
   }
 
-  size_t GetIndexOfChildWithName(const ConstString &name) override {
+  size_t GetIndexOfChildWithName(ConstString name) override {
     return formatters::ExtractIndexFromString(name.GetCString());
   }
 
diff --git a/lldb/source/Plugins/Language/CPlusPlus/LibCxxUnorderedMap.cpp b/lldb/source/Plugins/Language/CPlusPlus/LibCxxUnorderedMap.cpp
index f4abe93..b2c38c9 100644
--- a/lldb/source/Plugins/Language/CPlusPlus/LibCxxUnorderedMap.cpp
+++ b/lldb/source/Plugins/Language/CPlusPlus/LibCxxUnorderedMap.cpp
@@ -39,7 +39,7 @@
 
   bool MightHaveChildren() override;
 
-  size_t GetIndexOfChildWithName(const ConstString &name) override;
+  size_t GetIndexOfChildWithName(ConstString name) override;
 
 private:
   CompilerType m_element_type;
@@ -209,7 +209,7 @@
 }
 
 size_t lldb_private::formatters::LibcxxStdUnorderedMapSyntheticFrontEnd::
-    GetIndexOfChildWithName(const ConstString &name) {
+    GetIndexOfChildWithName(ConstString name) {
   return ExtractIndexFromString(name.GetCString());
 }
 
diff --git a/lldb/source/Plugins/Language/CPlusPlus/LibCxxVariant.cpp b/lldb/source/Plugins/Language/CPlusPlus/LibCxxVariant.cpp
index 11f845e..491cf04 100644
--- a/lldb/source/Plugins/Language/CPlusPlus/LibCxxVariant.cpp
+++ b/lldb/source/Plugins/Language/CPlusPlus/LibCxxVariant.cpp
@@ -173,7 +173,7 @@
     Update();
   }
 
-  size_t GetIndexOfChildWithName(const ConstString &name) override {
+  size_t GetIndexOfChildWithName(ConstString name) override {
     return formatters::ExtractIndexFromString(name.GetCString());
   }
 
diff --git a/lldb/source/Plugins/Language/CPlusPlus/LibCxxVector.cpp b/lldb/source/Plugins/Language/CPlusPlus/LibCxxVector.cpp
index c3bf9f8..b7ed597 100644
--- a/lldb/source/Plugins/Language/CPlusPlus/LibCxxVector.cpp
+++ b/lldb/source/Plugins/Language/CPlusPlus/LibCxxVector.cpp
@@ -32,7 +32,7 @@
 
   bool MightHaveChildren() override;
 
-  size_t GetIndexOfChildWithName(const ConstString &name) override;
+  size_t GetIndexOfChildWithName(ConstString name) override;
 
 private:
   ValueObject *m_start;
@@ -53,7 +53,7 @@
 
   bool MightHaveChildren() override { return true; }
 
-  size_t GetIndexOfChildWithName(const ConstString &name) override;
+  size_t GetIndexOfChildWithName(ConstString name) override;
 
 private:
   CompilerType m_bool_type;
@@ -164,7 +164,7 @@
 }
 
 size_t lldb_private::formatters::LibcxxStdVectorSyntheticFrontEnd::
-    GetIndexOfChildWithName(const ConstString &name) {
+    GetIndexOfChildWithName(ConstString name) {
   if (!m_start || !m_finish)
     return UINT32_MAX;
   return ExtractIndexFromString(name.GetCString());
@@ -271,7 +271,7 @@
 }
 
 size_t lldb_private::formatters::LibcxxVectorBoolSyntheticFrontEnd::
-    GetIndexOfChildWithName(const ConstString &name) {
+    GetIndexOfChildWithName(ConstString name) {
   if (!m_count || !m_base_data_address)
     return UINT32_MAX;
   const char *item_name = name.GetCString();
diff --git a/lldb/source/Plugins/Language/CPlusPlus/LibStdcpp.cpp b/lldb/source/Plugins/Language/CPlusPlus/LibStdcpp.cpp
index 7f00f36..0aac93c 100644
--- a/lldb/source/Plugins/Language/CPlusPlus/LibStdcpp.cpp
+++ b/lldb/source/Plugins/Language/CPlusPlus/LibStdcpp.cpp
@@ -49,7 +49,7 @@
 
   bool MightHaveChildren() override;
 
-  size_t GetIndexOfChildWithName(const ConstString &name) override;
+  size_t GetIndexOfChildWithName(ConstString name) override;
 
 private:
   ExecutionContextRef m_exe_ctx_ref;
@@ -70,7 +70,7 @@
 
   bool MightHaveChildren() override;
 
-  size_t GetIndexOfChildWithName(const ConstString &name) override;
+  size_t GetIndexOfChildWithName(ConstString name) override;
 };
 
 } // end of anonymous namespace
@@ -141,7 +141,7 @@
 bool LibstdcppMapIteratorSyntheticFrontEnd::MightHaveChildren() { return true; }
 
 size_t LibstdcppMapIteratorSyntheticFrontEnd::GetIndexOfChildWithName(
-    const ConstString &name) {
+    ConstString name) {
   if (name == ConstString("first"))
     return 0;
   if (name == ConstString("second"))
@@ -223,7 +223,7 @@
 bool VectorIteratorSyntheticFrontEnd::MightHaveChildren() { return true; }
 
 size_t VectorIteratorSyntheticFrontEnd::GetIndexOfChildWithName(
-    const ConstString &name) {
+    ConstString name) {
   if (name == ConstString("item"))
     return 0;
   return UINT32_MAX;
@@ -373,7 +373,7 @@
 bool LibStdcppSharedPtrSyntheticFrontEnd::MightHaveChildren() { return true; }
 
 size_t LibStdcppSharedPtrSyntheticFrontEnd::GetIndexOfChildWithName(
-    const ConstString &name) {
+    ConstString name) {
   if (name == ConstString("_M_ptr"))
     return 0;
   return UINT32_MAX;
diff --git a/lldb/source/Plugins/Language/CPlusPlus/LibStdcppTuple.cpp b/lldb/source/Plugins/Language/CPlusPlus/LibStdcppTuple.cpp
index 111b28b..66624e5 100644
--- a/lldb/source/Plugins/Language/CPlusPlus/LibStdcppTuple.cpp
+++ b/lldb/source/Plugins/Language/CPlusPlus/LibStdcppTuple.cpp
@@ -34,7 +34,7 @@
 
   bool MightHaveChildren() override;
 
-  size_t GetIndexOfChildWithName(const ConstString &name) override;
+  size_t GetIndexOfChildWithName(ConstString name) override;
 
 private:
   std::vector<ValueObjectSP> m_members;
@@ -95,7 +95,7 @@
 }
 
 size_t LibStdcppTupleSyntheticFrontEnd::GetIndexOfChildWithName(
-    const ConstString &name) {
+    ConstString name) {
   return ExtractIndexFromString(name.GetCString());
 }
 
diff --git a/lldb/source/Plugins/Language/CPlusPlus/LibStdcppUniquePointer.cpp b/lldb/source/Plugins/Language/CPlusPlus/LibStdcppUniquePointer.cpp
index 335523e..451e58f 100644
--- a/lldb/source/Plugins/Language/CPlusPlus/LibStdcppUniquePointer.cpp
+++ b/lldb/source/Plugins/Language/CPlusPlus/LibStdcppUniquePointer.cpp
@@ -34,7 +34,7 @@
 
   bool MightHaveChildren() override;
 
-  size_t GetIndexOfChildWithName(const ConstString &name) override;
+  size_t GetIndexOfChildWithName(ConstString name) override;
 
   bool GetSummary(Stream &stream, const TypeSummaryOptions &options);
 
@@ -129,7 +129,7 @@
 }
 
 size_t LibStdcppUniquePtrSyntheticFrontEnd::GetIndexOfChildWithName(
-    const ConstString &name) {
+    ConstString name) {
   if (name == ConstString("ptr") || name == ConstString("pointer"))
     return 0;
   if (name == ConstString("del") || name == ConstString("deleter"))