1 files changed, 424 insertions, 0 deletions
diff --git a/contrib/llvm/tools/clang/lib/CodeGen/CGDeclCXX.cpp b/contrib/llvm/tools/clang/lib/CodeGen/CGDeclCXX.cpp
new file mode 100644
index 0000000..f94ddd9
--- /dev/null
+++ b/contrib/llvm/tools/clang/lib/CodeGen/CGDeclCXX.cpp
@@ -0,0 +1,424 @@
+//===--- CGDeclCXX.cpp - Emit LLVM Code for C++ declarations --------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This contains code dealing with code generation of C++ declarations
+//
+//===----------------------------------------------------------------------===//
+
+#include "CodeGenFunction.h"
+#include "clang/CodeGen/CodeGenOptions.h"
+#include "llvm/Intrinsics.h"
+
+using namespace clang;
+using namespace CodeGen;
+
+static void EmitDeclInit(CodeGenFunction &CGF, const VarDecl &D,
+                         llvm::Constant *DeclPtr) {
+  assert(D.hasGlobalStorage() && "VarDecl must have global storage!");
+  assert(!D.getType()->isReferenceType() && 
+         "Should not call EmitDeclInit on a reference!");
+  
+  ASTContext &Context = CGF.getContext();
+    
+  const Expr *Init = D.getInit();
+  QualType T = D.getType();
+  bool isVolatile = Context.getCanonicalType(T).isVolatileQualified();
+
+  if (!CGF.hasAggregateLLVMType(T)) {
+    llvm::Value *V = CGF.EmitScalarExpr(Init);
+    CGF.EmitStoreOfScalar(V, DeclPtr, isVolatile, T);
+  } else if (T->isAnyComplexType()) {
+    CGF.EmitComplexExprIntoAddr(Init, DeclPtr, isVolatile);
+  } else {
+    CGF.EmitAggExpr(Init, DeclPtr, isVolatile);
+  }
+}
+
+static void EmitDeclDestroy(CodeGenFunction &CGF, const VarDecl &D,
+                            llvm::Constant *DeclPtr) {
+  CodeGenModule &CGM = CGF.CGM;
+  ASTContext &Context = CGF.getContext();
+  
+  const Expr *Init = D.getInit();
+  QualType T = D.getType();
+  if (!CGF.hasAggregateLLVMType(T) || T->isAnyComplexType())
+    return;
+                                
+  // Avoid generating destructor(s) for initialized objects. 
+  if (!isa<CXXConstructExpr>(Init))
+    return;
+  
+  const ConstantArrayType *Array = Context.getAsConstantArrayType(T);
+  if (Array)
+    T = Context.getBaseElementType(Array);
+  
+  const RecordType *RT = T->getAs<RecordType>();
+  if (!RT)
+    return;
+  
+  CXXRecordDecl *RD = cast<CXXRecordDecl>(RT->getDecl());
+  if (RD->hasTrivialDestructor())
+    return;
+  
+  CXXDestructorDecl *Dtor = RD->getDestructor(Context);
+  
+  llvm::Constant *DtorFn;
+  if (Array) {
+    DtorFn = 
+    CodeGenFunction(CGM).GenerateCXXAggrDestructorHelper(Dtor, 
+                                                         Array, 
+                                                         DeclPtr);
+    const llvm::Type *Int8PtrTy =
+    llvm::Type::getInt8PtrTy(CGM.getLLVMContext());
+    DeclPtr = llvm::Constant::getNullValue(Int8PtrTy);
+  } else
+    DtorFn = CGM.GetAddrOfCXXDestructor(Dtor, Dtor_Complete);
+  
+  CGF.EmitCXXGlobalDtorRegistration(DtorFn, DeclPtr);
+}
+
+void CodeGenFunction::EmitCXXGlobalVarDeclInit(const VarDecl &D,
+                                               llvm::Constant *DeclPtr) {
+
+  const Expr *Init = D.getInit();
+  QualType T = D.getType();
+
+  if (!T->isReferenceType()) {
+    EmitDeclInit(*this, D, DeclPtr);
+    EmitDeclDestroy(*this, D, DeclPtr);
+    return;
+  }
+  if (Init->isLvalue(getContext()) == Expr::LV_Valid) {
+    RValue RV = EmitReferenceBindingToExpr(Init, /*IsInitializer=*/true);
+    EmitStoreOfScalar(RV.getScalarVal(), DeclPtr, false, T);
+    return;
+  }
+  ErrorUnsupported(Init, 
+                   "global variable that binds reference to a non-lvalue");
+}
+
+void
+CodeGenFunction::EmitCXXGlobalDtorRegistration(llvm::Constant *DtorFn,
+                                               llvm::Constant *DeclPtr) {
+  // Generate a global destructor entry if not using __cxa_atexit.
+  if (!CGM.getCodeGenOpts().CXAAtExit) {
+    CGM.AddCXXDtorEntry(DtorFn, DeclPtr);
+    return;
+  }
+
+  const llvm::Type *Int8PtrTy = 
+    llvm::Type::getInt8Ty(VMContext)->getPointerTo();
+
+  std::vector<const llvm::Type *> Params;
+  Params.push_back(Int8PtrTy);
+
+  // Get the destructor function type
+  const llvm::Type *DtorFnTy =
+    llvm::FunctionType::get(llvm::Type::getVoidTy(VMContext), Params, false);
+  DtorFnTy = llvm::PointerType::getUnqual(DtorFnTy);
+
+  Params.clear();
+  Params.push_back(DtorFnTy);
+  Params.push_back(Int8PtrTy);
+  Params.push_back(Int8PtrTy);
+
+  // Get the __cxa_atexit function type
+  // extern "C" int __cxa_atexit ( void (*f)(void *), void *p, void *d );
+  const llvm::FunctionType *AtExitFnTy =
+    llvm::FunctionType::get(ConvertType(getContext().IntTy), Params, false);
+
+  llvm::Constant *AtExitFn = CGM.CreateRuntimeFunction(AtExitFnTy,
+                                                       "__cxa_atexit");
+
+  llvm::Constant *Handle = CGM.CreateRuntimeVariable(Int8PtrTy,
+                                                     "__dso_handle");
+  llvm::Value *Args[3] = { llvm::ConstantExpr::getBitCast(DtorFn, DtorFnTy),
+                           llvm::ConstantExpr::getBitCast(DeclPtr, Int8PtrTy),
+                           llvm::ConstantExpr::getBitCast(Handle, Int8PtrTy) };
+  Builder.CreateCall(AtExitFn, &Args[0], llvm::array_endof(Args));
+}
+
+void
+CodeGenModule::EmitCXXGlobalVarDeclInitFunc(const VarDecl *D) {
+  const llvm::FunctionType *FTy
+    = llvm::FunctionType::get(llvm::Type::getVoidTy(VMContext),
+                              false);
+
+  // Create a variable initialization function.
+  llvm::Function *Fn =
+    llvm::Function::Create(FTy, llvm::GlobalValue::InternalLinkage,
+                           "__cxx_global_var_init", &TheModule);
+
+  CodeGenFunction(*this).GenerateCXXGlobalVarDeclInitFunc(Fn, D);
+
+  CXXGlobalInits.push_back(Fn);
+}
+
+void
+CodeGenModule::EmitCXXGlobalInitFunc() {
+  if (CXXGlobalInits.empty())
+    return;
+
+  const llvm::FunctionType *FTy
+    = llvm::FunctionType::get(llvm::Type::getVoidTy(VMContext),
+                              false);
+
+  // Create our global initialization function.
+  llvm::Function *Fn =
+    llvm::Function::Create(FTy, llvm::GlobalValue::InternalLinkage,
+                           "_GLOBAL__I_a", &TheModule);
+
+  CodeGenFunction(*this).GenerateCXXGlobalInitFunc(Fn,
+                                                   &CXXGlobalInits[0],
+                                                   CXXGlobalInits.size());
+  AddGlobalCtor(Fn);
+}
+
+void CodeGenModule::AddCXXDtorEntry(llvm::Constant *DtorFn,
+                                    llvm::Constant *Object) {
+  CXXGlobalDtors.push_back(std::make_pair(DtorFn, Object));
+}
+
+void CodeGenModule::EmitCXXGlobalDtorFunc() {
+  if (CXXGlobalDtors.empty())
+    return;
+
+  const llvm::FunctionType *FTy
+    = llvm::FunctionType::get(llvm::Type::getVoidTy(VMContext),
+                              false);
+
+  // Create our global destructor function.
+  llvm::Function *Fn =
+    llvm::Function::Create(FTy, llvm::GlobalValue::InternalLinkage,
+                           "_GLOBAL__D_a", &TheModule);
+
+  CodeGenFunction(*this).GenerateCXXGlobalDtorFunc(Fn, CXXGlobalDtors);
+  AddGlobalDtor(Fn);
+}
+
+void CodeGenFunction::GenerateCXXGlobalVarDeclInitFunc(llvm::Function *Fn,
+                                                       const VarDecl *D) {
+  StartFunction(GlobalDecl(), getContext().VoidTy, Fn, FunctionArgList(),
+                SourceLocation());
+
+  llvm::Constant *DeclPtr = CGM.GetAddrOfGlobalVar(D);
+  EmitCXXGlobalVarDeclInit(*D, DeclPtr);
+
+  FinishFunction();
+}
+
+void CodeGenFunction::GenerateCXXGlobalInitFunc(llvm::Function *Fn,
+                                                llvm::Constant **Decls,
+                                                unsigned NumDecls) {
+  StartFunction(GlobalDecl(), getContext().VoidTy, Fn, FunctionArgList(),
+                SourceLocation());
+
+  for (unsigned i = 0; i != NumDecls; ++i)
+    Builder.CreateCall(Decls[i]);
+
+  FinishFunction();
+}
+
+void CodeGenFunction::GenerateCXXGlobalDtorFunc(llvm::Function *Fn,
+                const std::vector<std::pair<llvm::Constant*, llvm::Constant*> >
+                                                &DtorsAndObjects) {
+  StartFunction(GlobalDecl(), getContext().VoidTy, Fn, FunctionArgList(),
+                SourceLocation());
+
+  // Emit the dtors, in reverse order from construction.
+  for (unsigned i = 0, e = DtorsAndObjects.size(); i != e; ++i) {
+    llvm::Constant *Callee = DtorsAndObjects[e - i - 1].first;
+    llvm::CallInst *CI = Builder.CreateCall(Callee,
+                                            DtorsAndObjects[e - i - 1].second);
+    // Make sure the call and the callee agree on calling convention.
+    if (llvm::Function *F = dyn_cast<llvm::Function>(Callee))
+      CI->setCallingConv(F->getCallingConv());
+  }
+
+  FinishFunction();
+}
+
+static llvm::Constant *getGuardAcquireFn(CodeGenFunction &CGF) {
+  // int __cxa_guard_acquire(__int64_t *guard_object);
+  
+  const llvm::Type *Int64PtrTy = 
+    llvm::Type::getInt64PtrTy(CGF.getLLVMContext());
+  
+  std::vector<const llvm::Type*> Args(1, Int64PtrTy);
+  
+  const llvm::FunctionType *FTy =
+    llvm::FunctionType::get(CGF.ConvertType(CGF.getContext().IntTy),
+                            Args, /*isVarArg=*/false);
+  
+  return CGF.CGM.CreateRuntimeFunction(FTy, "__cxa_guard_acquire");
+}
+
+static llvm::Constant *getGuardReleaseFn(CodeGenFunction &CGF) {
+  // void __cxa_guard_release(__int64_t *guard_object);
+  
+  const llvm::Type *Int64PtrTy = 
+    llvm::Type::getInt64PtrTy(CGF.getLLVMContext());
+  
+  std::vector<const llvm::Type*> Args(1, Int64PtrTy);
+  
+  const llvm::FunctionType *FTy =
+  llvm::FunctionType::get(llvm::Type::getVoidTy(CGF.getLLVMContext()),
+                          Args, /*isVarArg=*/false);
+  
+  return CGF.CGM.CreateRuntimeFunction(FTy, "__cxa_guard_release");
+}
+
+static llvm::Constant *getGuardAbortFn(CodeGenFunction &CGF) {
+  // void __cxa_guard_abort(__int64_t *guard_object);
+  
+  const llvm::Type *Int64PtrTy = 
+    llvm::Type::getInt64PtrTy(CGF.getLLVMContext());
+  
+  std::vector<const llvm::Type*> Args(1, Int64PtrTy);
+  
+  const llvm::FunctionType *FTy =
+  llvm::FunctionType::get(llvm::Type::getVoidTy(CGF.getLLVMContext()),
+                          Args, /*isVarArg=*/false);
+  
+  return CGF.CGM.CreateRuntimeFunction(FTy, "__cxa_guard_abort");
+}
+
+void
+CodeGenFunction::EmitStaticCXXBlockVarDeclInit(const VarDecl &D,
+                                               llvm::GlobalVariable *GV) {
+  // Bail out early if this initializer isn't reachable.
+  if (!Builder.GetInsertBlock()) return;
+
+  bool ThreadsafeStatics = getContext().getLangOptions().ThreadsafeStatics;
+  
+  llvm::SmallString<256> GuardVName;
+  CGM.getMangleContext().mangleGuardVariable(&D, GuardVName);
+
+  // Create the guard variable.
+  const llvm::Type *Int64Ty = llvm::Type::getInt64Ty(VMContext);
+  llvm::GlobalValue *GuardVariable =
+    new llvm::GlobalVariable(CGM.getModule(), Int64Ty,
+                             false, GV->getLinkage(),
+                             llvm::Constant::getNullValue(Int64Ty),
+                             GuardVName.str());
+
+  // Load the first byte of the guard variable.
+  const llvm::Type *PtrTy
+    = llvm::PointerType::get(llvm::Type::getInt8Ty(VMContext), 0);
+  llvm::Value *V = 
+    Builder.CreateLoad(Builder.CreateBitCast(GuardVariable, PtrTy), "tmp");
+
+  llvm::BasicBlock *InitCheckBlock = createBasicBlock("init.check");
+  llvm::BasicBlock *EndBlock = createBasicBlock("init.end");
+
+  // Check if the first byte of the guard variable is zero.
+  Builder.CreateCondBr(Builder.CreateIsNull(V, "tobool"), 
+                       InitCheckBlock, EndBlock);
+
+  EmitBlock(InitCheckBlock);
+
+  // Variables used when coping with thread-safe statics and exceptions.
+  llvm::BasicBlock *SavedLandingPad = 0;
+  llvm::BasicBlock *LandingPad = 0;
+  if (ThreadsafeStatics) {    
+    // Call __cxa_guard_acquire.
+    V = Builder.CreateCall(getGuardAcquireFn(*this), GuardVariable);
+               
+    llvm::BasicBlock *InitBlock = createBasicBlock("init");
+  
+    Builder.CreateCondBr(Builder.CreateIsNotNull(V, "tobool"),
+                         InitBlock, EndBlock);
+  
+    if (Exceptions) {
+      SavedLandingPad = getInvokeDest();
+      LandingPad = createBasicBlock("guard.lpad");
+      setInvokeDest(LandingPad);
+    }
+    
+    EmitBlock(InitBlock);
+  }
+
+  if (D.getType()->isReferenceType()) {
+    QualType T = D.getType();
+    // We don't want to pass true for IsInitializer here, because a static
+    // reference to a temporary does not extend its lifetime.
+    RValue RV = EmitReferenceBindingToExpr(D.getInit(),
+                                           /*IsInitializer=*/false);
+    EmitStoreOfScalar(RV.getScalarVal(), GV, /*Volatile=*/false, T);
+
+  } else
+    EmitDeclInit(*this, D, GV);
+
+  if (ThreadsafeStatics) {
+    // Call __cxa_guard_release.
+    Builder.CreateCall(getGuardReleaseFn(*this), GuardVariable);    
+  } else {
+    llvm::Value *One = 
+      llvm::ConstantInt::get(llvm::Type::getInt8Ty(VMContext), 1);
+    Builder.CreateStore(One, Builder.CreateBitCast(GuardVariable, PtrTy));
+  }
+
+  // Register the call to the destructor.
+  if (!D.getType()->isReferenceType())
+    EmitDeclDestroy(*this, D, GV);
+  
+  if (ThreadsafeStatics && Exceptions) {
+    // If an exception is thrown during initialization, call __cxa_guard_abort
+    // along the exceptional edge.
+    EmitBranch(EndBlock);
+    
+    // Construct the landing pad.
+    EmitBlock(LandingPad);
+        
+    // Personality function and LLVM intrinsics.
+    llvm::Constant *Personality =
+      CGM.CreateRuntimeFunction(llvm::FunctionType::get(llvm::Type::getInt32Ty
+                                                        (VMContext),
+                                                        true),
+                                "__gxx_personality_v0");
+    Personality = llvm::ConstantExpr::getBitCast(Personality, PtrToInt8Ty);
+    llvm::Value *llvm_eh_exception =
+      CGM.getIntrinsic(llvm::Intrinsic::eh_exception);
+    llvm::Value *llvm_eh_selector =
+      CGM.getIntrinsic(llvm::Intrinsic::eh_selector);
+    
+    // Exception object
+    llvm::Value *Exc = Builder.CreateCall(llvm_eh_exception, "exc");
+    llvm::Value *RethrowPtr = CreateTempAlloca(Exc->getType(), "_rethrow");
+
+    // Call the selector function.
+    const llvm::PointerType *PtrToInt8Ty 
+      = llvm::PointerType::getUnqual(llvm::Type::getInt8Ty(VMContext));
+    llvm::Constant *Null = llvm::ConstantPointerNull::get(PtrToInt8Ty);
+    llvm::Value* SelectorArgs[3] = { Exc, Personality, Null };
+    Builder.CreateCall(llvm_eh_selector, SelectorArgs, SelectorArgs + 3,
+                           "selector");
+    Builder.CreateStore(Exc, RethrowPtr);
+                                
+    // Call __cxa_guard_abort along the exceptional edge.
+    Builder.CreateCall(getGuardAbortFn(*this), GuardVariable);
+
+    setInvokeDest(SavedLandingPad);
+
+    // Rethrow the current exception.
+    if (getInvokeDest()) {
+      llvm::BasicBlock *Cont = createBasicBlock("invoke.cont");
+      Builder.CreateInvoke(getUnwindResumeOrRethrowFn(), Cont,
+                           getInvokeDest(),
+                           Builder.CreateLoad(RethrowPtr));
+      EmitBlock(Cont);
+    } else
+      Builder.CreateCall(getUnwindResumeOrRethrowFn(),
+                         Builder.CreateLoad(RethrowPtr));
+    
+    Builder.CreateUnreachable();    
+  }    
+  
+  EmitBlock(EndBlock);
+}