Add codegen support for __uuidof().
llvm-svn: 165710
diff --git a/clang/lib/CodeGen/CodeGenModule.cpp b/clang/lib/CodeGen/CodeGenModule.cpp
index e979e52..c799e4a 100644
--- a/clang/lib/CodeGen/CodeGenModule.cpp
+++ b/clang/lib/CodeGen/CodeGenModule.cpp
@@ -832,6 +832,49 @@
return !getContext().DeclMustBeEmitted(Global);
}
+llvm::Constant *CodeGenModule::GetAddrOfUuidDescriptor(
+ const CXXUuidofExpr* E) {
+ // Sema has verified that IIDSource has a __declspec(uuid()), and that its
+ // well-formed.
+ StringRef Uuid;
+ if (E->isTypeOperand())
+ Uuid = CXXUuidofExpr::GetUuidAttrOfType(E->getTypeOperand())->getGuid();
+ else {
+ // Special case: __uuidof(0) means an all-zero GUID.
+ Expr *Op = E->getExprOperand();
+ if (!Op->isNullPointerConstant(Context, Expr::NPC_ValueDependentIsNull))
+ Uuid = CXXUuidofExpr::GetUuidAttrOfType(Op->getType())->getGuid();
+ else
+ Uuid = "00000000-0000-0000-0000-000000000000";
+ }
+ std::string Name = "__uuid_" + Uuid.str();
+
+ // Look for an existing global.
+ if (llvm::GlobalVariable *GV = getModule().getNamedGlobal(Name))
+ return GV;
+
+ llvm::Constant *Init = EmitUuidofInitializer(Uuid, E->getType());
+ assert(Init && "failed to initialize as constant");
+
+ // GUIDs are assumed to be 16 bytes, spread over 4-2-2-8 bytes. However, the
+ // first field is declared as "long", which for many targets is 8 bytes.
+ // Those architectures are not supported. (With the MS abi, long is always 4
+ // bytes.)
+ llvm::Type *GuidType = getTypes().ConvertType(E->getType());
+ if (Init->getType() != GuidType) {
+ DiagnosticsEngine &Diags = getDiags();
+ unsigned DiagID = Diags.getCustomDiagID(DiagnosticsEngine::Error,
+ "__uuidof codegen is not supported on this architecture");
+ Diags.Report(E->getExprLoc(), DiagID) << E->getSourceRange();
+ Init = llvm::UndefValue::get(GuidType);
+ }
+
+ llvm::GlobalVariable *GV = new llvm::GlobalVariable(getModule(), GuidType,
+ /*isConstant=*/true, llvm::GlobalValue::PrivateLinkage, Init, Name);
+ GV->setUnnamedAddr(true);
+ return GV;
+}
+
llvm::Constant *CodeGenModule::GetWeakRefReference(const ValueDecl *VD) {
const AliasAttr *AA = VD->getAttr<AliasAttr>();
assert(AA && "No alias?");
@@ -1286,7 +1329,7 @@
// Because C++ name mangling, the only way we can end up with an already
// existing global with the same name is if it has been declared extern "C".
- assert(GV->isDeclaration() && "Declaration has wrong type!");
+ assert(GV->isDeclaration() && "Declaration has wrong type!");
OldGV = GV;
}
@@ -2756,3 +2799,40 @@
}
}
}
+
+llvm::Constant *CodeGenModule::EmitUuidofInitializer(StringRef Uuid,
+ QualType GuidType) {
+ // Sema has checked that all uuid strings are of the form
+ // "12345678-1234-1234-1234-1234567890ab".
+ assert(Uuid.size() == 36);
+ const char *Uuidstr = Uuid.data();
+ for (int i = 0; i < 36; ++i) {
+ if (i == 8 || i == 13 || i == 18 || i == 23) assert(Uuidstr[i] == '-');
+ else assert(isxdigit(Uuidstr[i]));
+ }
+
+ llvm::APInt Field0(32, StringRef(Uuidstr , 8), 16);
+ llvm::APInt Field1(16, StringRef(Uuidstr + 9, 4), 16);
+ llvm::APInt Field2(16, StringRef(Uuidstr + 14, 4), 16);
+ llvm::APInt Field3Values[] = {
+ llvm::APInt(8, StringRef(Uuidstr + 19, 2), 16),
+ llvm::APInt(8, StringRef(Uuidstr + 21, 2), 16),
+ llvm::APInt(8, StringRef(Uuidstr + 24, 2), 16),
+ llvm::APInt(8, StringRef(Uuidstr + 26, 2), 16),
+ llvm::APInt(8, StringRef(Uuidstr + 28, 2), 16),
+ llvm::APInt(8, StringRef(Uuidstr + 30, 2), 16),
+ llvm::APInt(8, StringRef(Uuidstr + 32, 2), 16),
+ llvm::APInt(8, StringRef(Uuidstr + 34, 2), 16),
+ };
+
+ APValue InitStruct(APValue::UninitStruct(), /*NumBases=*/0, /*NumFields=*/4);
+ InitStruct.getStructField(0) = APValue(llvm::APSInt(Field0));
+ InitStruct.getStructField(1) = APValue(llvm::APSInt(Field1));
+ InitStruct.getStructField(2) = APValue(llvm::APSInt(Field2));
+ APValue& Arr = InitStruct.getStructField(3);
+ Arr = APValue(APValue::UninitArray(), 8, 8);
+ for (int t = 0; t < 8; ++t)
+ Arr.getArrayInitializedElt(t) = APValue(llvm::APSInt(Field3Values[t]));
+
+ return EmitConstantValue(InitStruct, GuidType);
+}