IRGen-level lowering for the Swift calling convention.

llvm-svn: 265324

1 files changed, 43 insertions, 8 deletions

diff --git a/clang/lib/CodeGen/ABIInfo.h b/clang/lib/CodeGen/ABIInfo.h
index 24410715df6..530a7ef560c 100644
--- a/clang/lib/CodeGen/ABIInfo.h
+++ b/clang/lib/CodeGen/ABIInfo.h
@@ -18,20 +18,25 @@ namespace llvm {
   class Value;
   class LLVMContext;
   class DataLayout;
+  class Type;
 }
 
 namespace clang {
   class ASTContext;
   class TargetInfo;
 
-  namespace CodeGen {
-    class ABIArgInfo;
-    class Address;
-    class CGCXXABI;
-    class CGFunctionInfo;
-    class CodeGenFunction;
-    class CodeGenTypes;
-  }
+namespace CodeGen {
+  class ABIArgInfo;
+  class Address;
+  class CGCXXABI;
+  class CGFunctionInfo;
+  class CodeGenFunction;
+  class CodeGenTypes;
+  class SwiftABIInfo;
+
+namespace swiftcall {
+  class SwiftAggLowering;
+}
 
   // FIXME: All of this stuff should be part of the target interface
   // somehow. It is currently here because it is not clear how to factor
@@ -55,6 +60,8 @@ namespace clang {
 
     virtual ~ABIInfo();
 
+    virtual bool supportsSwift() const { return false; }
+
     CodeGen::CGCXXABI &getCXXABI() const;
     ASTContext &getContext() const;
     llvm::LLVMContext &getVMContext() const;
@@ -112,7 +119,35 @@ namespace clang {
 
     CodeGen::ABIArgInfo
     getNaturalAlignIndirectInReg(QualType Ty, bool Realign = false) const;
+
+
   };
+
+  /// A refining implementation of ABIInfo for targets that support swiftcall.
+  ///
+  /// If we find ourselves wanting multiple such refinements, they'll probably
+  /// be independent refinements, and we should probably find another way
+  /// to do it than simple inheritance.
+  class SwiftABIInfo : public ABIInfo {
+  public:
+    SwiftABIInfo(CodeGen::CodeGenTypes &cgt) : ABIInfo(cgt) {}
+
+    bool supportsSwift() const final override { return true; }
+
+    virtual bool shouldPassIndirectlyForSwift(CharUnits totalSize,
+                                              ArrayRef<llvm::Type*> types,
+                                              bool asReturnValue) const = 0;
+
+    virtual bool isLegalVectorTypeForSwift(CharUnits totalSize,
+                                           llvm::Type *eltTy,
+                                           unsigned elts) const;
+
+    static bool classof(const ABIInfo *info) {
+      return info->supportsSwift();
+    }
+  };
+
+}  // end namespace CodeGen
 }  // end namespace clang
 
 #endif