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

1 files changed, 199 insertions, 0 deletions

diff --git a/clang/lib/CodeGen/CGCXXABI.cpp b/clang/lib/CodeGen/CGCXXABI.cpp
new file mode 100644
index 0000000..befebbe
--- /dev/null
+++ b/clang/lib/CodeGen/CGCXXABI.cpp
@@ -0,0 +1,199 @@
+//===----- CGCXXABI.cpp - Interface to C++ ABIs -----------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This provides an abstract class for C++ code generation. Concrete subclasses
+// of this implement code generation for specific C++ ABIs.
+//
+//===----------------------------------------------------------------------===//
+
+#include "CGCXXABI.h"
+
+using namespace clang;
+using namespace CodeGen;
+
+CGCXXABI::~CGCXXABI() { }
+
+static void ErrorUnsupportedABI(CodeGenFunction &CGF,
+                                StringRef S) {
+  DiagnosticsEngine &Diags = CGF.CGM.getDiags();
+  unsigned DiagID = Diags.getCustomDiagID(DiagnosticsEngine::Error,
+                                          "cannot yet compile %1 in this ABI");
+  Diags.Report(CGF.getContext().getFullLoc(CGF.CurCodeDecl->getLocation()),
+               DiagID)
+    << S;
+}
+
+static llvm::Constant *GetBogusMemberPointer(CodeGenModule &CGM,
+                                             QualType T) {
+  return llvm::Constant::getNullValue(CGM.getTypes().ConvertType(T));
+}
+
+llvm::Type *
+CGCXXABI::ConvertMemberPointerType(const MemberPointerType *MPT) {
+  return CGM.getTypes().ConvertType(CGM.getContext().getPointerDiffType());
+}
+
+llvm::Value *CGCXXABI::EmitLoadOfMemberFunctionPointer(CodeGenFunction &CGF,
+                                                       llvm::Value *&This,
+                                                       llvm::Value *MemPtr,
+                                                 const MemberPointerType *MPT) {
+  ErrorUnsupportedABI(CGF, "calls through member pointers");
+
+  const FunctionProtoType *FPT = 
+    MPT->getPointeeType()->getAs<FunctionProtoType>();
+  const CXXRecordDecl *RD = 
+    cast<CXXRecordDecl>(MPT->getClass()->getAs<RecordType>()->getDecl());
+  llvm::FunctionType *FTy = CGM.getTypes().GetFunctionType(
+                              CGM.getTypes().arrangeCXXMethodType(RD, FPT));
+  return llvm::Constant::getNullValue(FTy->getPointerTo());
+}
+
+llvm::Value *CGCXXABI::EmitMemberDataPointerAddress(CodeGenFunction &CGF,
+                                                    llvm::Value *Base,
+                                                    llvm::Value *MemPtr,
+                                              const MemberPointerType *MPT) {
+  ErrorUnsupportedABI(CGF, "loads of member pointers");
+  llvm::Type *Ty = CGF.ConvertType(MPT->getPointeeType())->getPointerTo();
+  return llvm::Constant::getNullValue(Ty);
+}
+
+llvm::Value *CGCXXABI::EmitMemberPointerConversion(CodeGenFunction &CGF,
+                                                   const CastExpr *E,
+                                                   llvm::Value *Src) {
+  ErrorUnsupportedABI(CGF, "member function pointer conversions");
+  return GetBogusMemberPointer(CGM, E->getType());
+}
+
+llvm::Constant *CGCXXABI::EmitMemberPointerConversion(const CastExpr *E,
+                                                      llvm::Constant *Src) {
+  return GetBogusMemberPointer(CGM, E->getType());
+}
+
+llvm::Value *
+CGCXXABI::EmitMemberPointerComparison(CodeGenFunction &CGF,
+                                      llvm::Value *L,
+                                      llvm::Value *R,
+                                      const MemberPointerType *MPT,
+                                      bool Inequality) {
+  ErrorUnsupportedABI(CGF, "member function pointer comparison");
+  return CGF.Builder.getFalse();
+}
+
+llvm::Value *
+CGCXXABI::EmitMemberPointerIsNotNull(CodeGenFunction &CGF,
+                                     llvm::Value *MemPtr,
+                                     const MemberPointerType *MPT) {
+  ErrorUnsupportedABI(CGF, "member function pointer null testing");
+  return CGF.Builder.getFalse();
+}
+
+llvm::Constant *
+CGCXXABI::EmitNullMemberPointer(const MemberPointerType *MPT) {
+  return GetBogusMemberPointer(CGM, QualType(MPT, 0));
+}
+
+llvm::Constant *CGCXXABI::EmitMemberPointer(const CXXMethodDecl *MD) {
+  return GetBogusMemberPointer(CGM,
+                         CGM.getContext().getMemberPointerType(MD->getType(),
+                                         MD->getParent()->getTypeForDecl()));
+}
+
+llvm::Constant *CGCXXABI::EmitMemberDataPointer(const MemberPointerType *MPT,
+                                                CharUnits offset) {
+  return GetBogusMemberPointer(CGM, QualType(MPT, 0));
+}
+
+llvm::Constant *CGCXXABI::EmitMemberPointer(const APValue &MP, QualType MPT) {
+  return GetBogusMemberPointer(CGM, MPT);
+}
+
+bool CGCXXABI::isZeroInitializable(const MemberPointerType *MPT) {
+  // Fake answer.
+  return true;
+}
+
+void CGCXXABI::BuildThisParam(CodeGenFunction &CGF, FunctionArgList &params) {
+  const CXXMethodDecl *MD = cast<CXXMethodDecl>(CGF.CurGD.getDecl());
+
+  // FIXME: I'm not entirely sure I like using a fake decl just for code
+  // generation. Maybe we can come up with a better way?
+  ImplicitParamDecl *ThisDecl
+    = ImplicitParamDecl::Create(CGM.getContext(), 0, MD->getLocation(),
+                                &CGM.getContext().Idents.get("this"),
+                                MD->getThisType(CGM.getContext()));
+  params.push_back(ThisDecl);
+  getThisDecl(CGF) = ThisDecl;
+}
+
+void CGCXXABI::EmitThisParam(CodeGenFunction &CGF) {
+  /// Initialize the 'this' slot.
+  assert(getThisDecl(CGF) && "no 'this' variable for function");
+  getThisValue(CGF)
+    = CGF.Builder.CreateLoad(CGF.GetAddrOfLocalVar(getThisDecl(CGF)),
+                             "this");
+}
+
+void CGCXXABI::EmitReturnFromThunk(CodeGenFunction &CGF,
+                                   RValue RV, QualType ResultType) {
+  CGF.EmitReturnOfRValue(RV, ResultType);
+}
+
+CharUnits CGCXXABI::GetArrayCookieSize(const CXXNewExpr *expr) {
+  return CharUnits::Zero();
+}
+
+llvm::Value *CGCXXABI::InitializeArrayCookie(CodeGenFunction &CGF,
+                                             llvm::Value *NewPtr,
+                                             llvm::Value *NumElements,
+                                             const CXXNewExpr *expr,
+                                             QualType ElementType) {
+  // Should never be called.
+  ErrorUnsupportedABI(CGF, "array cookie initialization");
+  return 0;
+}
+
+void CGCXXABI::ReadArrayCookie(CodeGenFunction &CGF, llvm::Value *Ptr,
+                               const CXXDeleteExpr *expr, QualType ElementType,
+                               llvm::Value *&NumElements,
+                               llvm::Value *&AllocPtr, CharUnits &CookieSize) {
+  ErrorUnsupportedABI(CGF, "array cookie reading");
+
+  // This should be enough to avoid assertions.
+  NumElements = 0;
+  AllocPtr = llvm::Constant::getNullValue(CGF.Builder.getInt8PtrTy());
+  CookieSize = CharUnits::Zero();
+}
+
+void CGCXXABI::EmitGuardedInit(CodeGenFunction &CGF,
+                               const VarDecl &D,
+                               llvm::GlobalVariable *GV,
+                               bool PerformInit) {
+  ErrorUnsupportedABI(CGF, "static local variable initialization");
+}
+
+/// Returns the adjustment, in bytes, required for the given
+/// member-pointer operation.  Returns null if no adjustment is
+/// required.
+llvm::Constant *CGCXXABI::getMemberPointerAdjustment(const CastExpr *E) {
+  assert(E->getCastKind() == CK_DerivedToBaseMemberPointer ||
+         E->getCastKind() == CK_BaseToDerivedMemberPointer);
+
+  QualType derivedType;
+  if (E->getCastKind() == CK_DerivedToBaseMemberPointer)
+    derivedType = E->getSubExpr()->getType();
+  else
+    derivedType = E->getType();
+
+  const CXXRecordDecl *derivedClass =
+    derivedType->castAs<MemberPointerType>()->getClass()->getAsCXXRecordDecl();
+
+  return CGM.GetNonVirtualBaseClassOffset(derivedClass,
+                                          E->path_begin(),
+                                          E->path_end());
+}