Add the clang library to the repo (with some of my changes, too).

1 files changed, 95 insertions, 0 deletions

diff --git a/clang/lib/CodeGen/MicrosoftCXXABI.cpp b/clang/lib/CodeGen/MicrosoftCXXABI.cpp
new file mode 100644
index 0000000..825e041
--- /dev/null
+++ b/clang/lib/CodeGen/MicrosoftCXXABI.cpp
@@ -0,0 +1,95 @@
+//===--- MicrosoftCXXABI.cpp - Emit LLVM Code from ASTs for a Module ------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This provides C++ code generation targeting the Microsoft Visual C++ ABI.
+// The class in this file generates structures that follow the Microsoft
+// Visual C++ ABI, which is actually not very well documented at all outside
+// of Microsoft.
+//
+//===----------------------------------------------------------------------===//
+
+#include "CGCXXABI.h"
+#include "CodeGenModule.h"
+#include "clang/AST/Decl.h"
+#include "clang/AST/DeclCXX.h"
+
+using namespace clang;
+using namespace CodeGen;
+
+namespace {
+
+class MicrosoftCXXABI : public CGCXXABI {
+public:
+  MicrosoftCXXABI(CodeGenModule &CGM) : CGCXXABI(CGM) {}
+
+  void BuildConstructorSignature(const CXXConstructorDecl *Ctor,
+                                 CXXCtorType Type,
+                                 CanQualType &ResTy,
+                                 SmallVectorImpl<CanQualType> &ArgTys) {
+    // 'this' is already in place
+    // TODO: 'for base' flag
+  }  
+
+  void BuildDestructorSignature(const CXXDestructorDecl *Ctor,
+                                CXXDtorType Type,
+                                CanQualType &ResTy,
+                                SmallVectorImpl<CanQualType> &ArgTys) {
+    // 'this' is already in place
+    // TODO: 'for base' flag
+  }
+
+  void BuildInstanceFunctionParams(CodeGenFunction &CGF,
+                                   QualType &ResTy,
+                                   FunctionArgList &Params) {
+    BuildThisParam(CGF, Params);
+    // TODO: 'for base' flag
+  }
+
+  void EmitInstanceFunctionProlog(CodeGenFunction &CGF) {
+    EmitThisParam(CGF);
+    // TODO: 'for base' flag
+  }
+
+  // ==== Notes on array cookies =========
+  //
+  // MSVC seems to only use cookies when the class has a destructor; a
+  // two-argument usual array deallocation function isn't sufficient.
+  //
+  // For example, this code prints "100" and "1":
+  //   struct A {
+  //     char x;
+  //     void *operator new[](size_t sz) {
+  //       printf("%u\n", sz);
+  //       return malloc(sz);
+  //     }
+  //     void operator delete[](void *p, size_t sz) {
+  //       printf("%u\n", sz);
+  //       free(p);
+  //     }
+  //   };
+  //   int main() {
+  //     A *p = new A[100];
+  //     delete[] p;
+  //   }
+  // Whereas it prints "104" and "104" if you give A a destructor.
+  void ReadArrayCookie(CodeGenFunction &CGF, llvm::Value *Ptr,
+                       const CXXDeleteExpr *expr,
+                       QualType ElementType, llvm::Value *&NumElements,
+                       llvm::Value *&AllocPtr, CharUnits &CookieSize) {
+    CGF.CGM.ErrorUnsupported(expr, "don't know how to handle array cookies "
+                                   "in the Microsoft C++ ABI");
+  }
+};
+
+}
+
+CGCXXABI *clang::CodeGen::CreateMicrosoftCXXABI(CodeGenModule &CGM) {
+  return new MicrosoftCXXABI(CGM);
+}
+