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Add codegen support for __uuidof().

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llvm-svn: 165710
This commit is contained in:
Nico Weber
2012-10-11 10:13:44 +00:00
parent e4658e89d7
commit cf4ff586e8
10 changed files with 213 additions and 24 deletions
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82
clang/lib/CodeGen/CodeGenModule.cpp
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@@ -832,6 +832,49 @@ bool CodeGenModule::MayDeferGeneration(const ValueDecl *Global) {
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 @@ CodeGenModule::CreateOrReplaceCXXRuntimeVariable(StringRef Name,
// 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 @@ void CodeGenModule::EmitCoverageFile() {
}
}
}
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);
}