1 files changed, 133 insertions, 0 deletions
diff --git a/lib/CodeGen/ABIInfo.h b/lib/CodeGen/ABIInfo.h
new file mode 100644
index 0000000..3de4612
--- /dev/null
+++ b/lib/CodeGen/ABIInfo.h
@@ -0,0 +1,133 @@
+//===----- ABIInfo.h - ABI information access & encapsulation ---*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef CLANG_CODEGEN_ABIINFO_H
+#define CLANG_CODEGEN_ABIINFO_H
+
+namespace llvm {
+  class Type;
+}
+
+namespace clang {
+  class ASTContext;
+
+  // FIXME: This is a layering issue if we want to move ABIInfo
+  // down. Fortunately CGFunctionInfo has no real tie to CodeGen.
+  namespace CodeGen {
+    class CGFunctionInfo;
+    class CodeGenFunction;
+  }
+
+  /* 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
+     the targets to support this, since the Targets currently live in a
+     layer below types n'stuff.
+  */
+
+  /// ABIArgInfo - Helper class to encapsulate information about how a
+  /// specific C type should be passed to or returned from a function.
+  class ABIArgInfo {
+  public:
+    enum Kind {
+      Direct,    /// Pass the argument directly using the normal
+                 /// converted LLVM type. Complex and structure types
+                 /// are passed using first class aggregates.
+  
+      Indirect,  /// Pass the argument indirectly via a hidden pointer
+                 /// with the specified alignment (0 indicates default
+                 /// alignment).
+  
+      Ignore,    /// Ignore the argument (treat as void). Useful for
+                 /// void and empty structs.
+  
+      Coerce,    /// Only valid for aggregate return types, the argument
+                 /// should be accessed by coercion to a provided type.
+  
+      Expand,    /// Only valid for aggregate argument types. The
+                 /// structure should be expanded into consecutive
+                 /// arguments for its constituent fields. Currently
+                 /// expand is only allowed on structures whose fields
+                 /// are all scalar types or are themselves expandable
+                 /// types.
+  
+      KindFirst=Direct, KindLast=Expand
+    };
+  
+  private:
+    Kind TheKind;
+    const llvm::Type *TypeData;
+    unsigned UIntData;
+  
+    ABIArgInfo(Kind K, const llvm::Type *TD=0,
+               unsigned UI=0) : TheKind(K),
+                                TypeData(TD),
+                                UIntData(UI) {}
+  public:
+    ABIArgInfo() : TheKind(Direct), TypeData(0), UIntData(0) {}
+
+    static ABIArgInfo getDirect() { 
+      return ABIArgInfo(Direct); 
+    }
+    static ABIArgInfo getIgnore() {
+      return ABIArgInfo(Ignore);
+    }
+    static ABIArgInfo getCoerce(const llvm::Type *T) { 
+      return ABIArgInfo(Coerce, T);
+    }
+    static ABIArgInfo getIndirect(unsigned Alignment) {
+      return ABIArgInfo(Indirect, 0, Alignment);
+    }
+    static ABIArgInfo getExpand() {
+      return ABIArgInfo(Expand);
+    }
+  
+    Kind getKind() const { return TheKind; }
+    bool isDirect() const { return TheKind == Direct; }
+    bool isIgnore() const { return TheKind == Ignore; }
+    bool isCoerce() const { return TheKind == Coerce; }
+    bool isIndirect() const { return TheKind == Indirect; }
+    bool isExpand() const { return TheKind == Expand; }
+  
+    // Coerce accessors
+    const llvm::Type *getCoerceToType() const {
+      assert(TheKind == Coerce && "Invalid kind!");
+      return TypeData;
+    }
+  
+    // ByVal accessors
+    unsigned getIndirectAlign() const {
+      assert(TheKind == Indirect && "Invalid kind!");
+      return UIntData;
+    }
+
+    void dump() const;
+  };
+
+  /// ABIInfo - Target specific hooks for defining how a type should be
+  /// passed or returned from functions.
+  class ABIInfo {
+  public:
+    virtual ~ABIInfo();
+
+    virtual void computeInfo(CodeGen::CGFunctionInfo &FI,
+                             ASTContext &Ctx) const = 0;
+
+    /// EmitVAArg - Emit the target dependent code to load a value of
+    /// \arg Ty from the va_list pointed to by \arg VAListAddr.
+    
+    // FIXME: This is a gaping layering violation if we wanted to drop
+    // the ABI information any lower than CodeGen. Of course, for
+    // VAArg handling it has to be at this level; there is no way to
+    // abstract this out.
+    virtual llvm::Value *EmitVAArg(llvm::Value *VAListAddr, QualType Ty,
+                                   CodeGen::CodeGenFunction &CGF) const = 0;
+  };
+}  // end namespace clang
+
+#endif