Dependent Address Space Support

This patch relates to: https://reviews.llvm.org/D33666 This adds support
for template parameters to be passed to the address_space attribute. 
The main goal is to add further flexibility to the attribute and allow 
for it to be used easily with templates.

The main additions are a new type (DependentAddressSpaceType) alongside 
its TypeLoc and its mangling. As well as the logic required to support 
dependent address spaces which mainly resides in TreeTransform.h and 
SemaType.cpp.

llvm-svn: 314649

2 files changed, 41 insertions, 0 deletions

diff --git a/clang/lib/Serialization/ASTReader.cpp b/clang/lib/Serialization/ASTReader.cpp
index 7d745447a81..4ac8aa38558 100644
--- a/clang/lib/Serialization/ASTReader.cpp
+++ b/clang/lib/Serialization/ASTReader.cpp
@@ -6269,6 +6269,18 @@ QualType ASTReader::readTypeRecord(unsigned Index) {
     return Context.getDependentSizedExtVectorType(ElementType, SizeExpr,
                                                   AttrLoc);
   }
+
+  case TYPE_DEPENDENT_ADDRESS_SPACE: {
+    unsigned Idx = 0;
+
+    // DependentAddressSpaceType
+    QualType PointeeType = readType(*Loc.F, Record, Idx);
+    Expr *AddrSpaceExpr = ReadExpr(*Loc.F);
+    SourceLocation AttrLoc = ReadSourceLocation(*Loc.F, Record, Idx);
+
+    return Context.getDependentAddressSpaceType(PointeeType, AddrSpaceExpr,
+                                                   AttrLoc);
+  }
   }
   llvm_unreachable("Invalid TypeCode!");
 }
@@ -6402,6 +6414,17 @@ void TypeLocReader::VisitDependentSizedArrayTypeLoc(
   VisitArrayTypeLoc(TL);
 }
 
+void TypeLocReader::VisitDependentAddressSpaceTypeLoc(
+    DependentAddressSpaceTypeLoc TL) {
+
+    TL.setAttrNameLoc(ReadSourceLocation());
+    SourceRange range;
+    range.setBegin(ReadSourceLocation());
+    range.setEnd(ReadSourceLocation());
+    TL.setAttrOperandParensRange(range);
+    TL.setAttrExprOperand(Reader->ReadExpr(*F));
+}
+
 void TypeLocReader::VisitDependentSizedExtVectorTypeLoc(
                                         DependentSizedExtVectorTypeLoc TL) {
   TL.setNameLoc(ReadSourceLocation());
diff --git a/clang/lib/Serialization/ASTWriter.cpp b/clang/lib/Serialization/ASTWriter.cpp
index 4c22067b830..166db2c1af3 100644
--- a/clang/lib/Serialization/ASTWriter.cpp
+++ b/clang/lib/Serialization/ASTWriter.cpp
@@ -433,6 +433,15 @@ ASTTypeWriter::VisitDependentSizedExtVectorType(
   Code = TYPE_DEPENDENT_SIZED_EXT_VECTOR;
 }
 
+void 
+ASTTypeWriter::VisitDependentAddressSpaceType(
+    const DependentAddressSpaceType *T) {
+  Record.AddTypeRef(T->getPointeeType());
+  Record.AddStmt(T->getAddrSpaceExpr());
+  Record.AddSourceLocation(T->getAttributeLoc());
+  Code = TYPE_DEPENDENT_ADDRESS_SPACE;
+}
+
 void
 ASTTypeWriter::VisitTemplateTypeParmType(const TemplateTypeParmType *T) {
   Record.push_back(T->getDepth());
@@ -627,6 +636,15 @@ void TypeLocWriter::VisitDependentSizedArrayTypeLoc(
   VisitArrayTypeLoc(TL);
 }
 
+void TypeLocWriter::VisitDependentAddressSpaceTypeLoc(
+    DependentAddressSpaceTypeLoc TL) {
+  Record.AddSourceLocation(TL.getAttrNameLoc());
+  SourceRange range = TL.getAttrOperandParensRange();
+  Record.AddSourceLocation(range.getBegin());
+  Record.AddSourceLocation(range.getEnd());
+  Record.AddStmt(TL.getAttrExprOperand());       
+}
+
 void TypeLocWriter::VisitDependentSizedExtVectorTypeLoc(
                                         DependentSizedExtVectorTypeLoc TL) {
   Record.AddSourceLocation(TL.getNameLoc());