return CodeGenFunction(CGM).GenerateDestroyHelperFunction(blockInfo);
}
+namespace {
+
+/// Represents a type of copy/destroy operation that should be performed for an
+/// entity that's captured by a block.
+enum class BlockCaptureEntityKind {
+ CXXRecord, // Copy or destroy
+ ARCWeak,
+ ARCStrong,
+ NonTrivialCStruct,
+ BlockObject, // Assign or release
+ None
+};
+
+/// Represents a captured entity that requires extra operations in order for
+/// this entity to be copied or destroyed correctly.
+struct BlockCaptureManagedEntity {
+ BlockCaptureEntityKind CopyKind, DisposeKind;
+ BlockFieldFlags CopyFlags, DisposeFlags;
+ const BlockDecl::Capture *CI;
+ const CGBlockInfo::Capture *Capture;
+
+ BlockCaptureManagedEntity(BlockCaptureEntityKind CopyType,
+ BlockCaptureEntityKind DisposeType,
+ BlockFieldFlags CopyFlags,
+ BlockFieldFlags DisposeFlags,
+ const BlockDecl::Capture &CI,
+ const CGBlockInfo::Capture &Capture)
+ : CopyKind(CopyType), DisposeKind(DisposeType), CopyFlags(CopyFlags),
+ DisposeFlags(DisposeFlags), CI(&CI), Capture(&Capture) {}
+
+ bool operator<(const BlockCaptureManagedEntity &Other) const {
+ return Capture->getOffset() < Other.Capture->getOffset();
+ }
+};
+
+enum class CaptureStrKind {
+ // String for the copy helper.
+ CopyHelper,
+ // String for the dispose helper.
+ DisposeHelper,
+ // Merge the strings for the copy helper and dispose helper.
+ Merged
+};
+
+} // end anonymous namespace
+
+static void findBlockCapturedManagedEntities(
+ const CGBlockInfo &BlockInfo, const LangOptions &LangOpts,
+ SmallVectorImpl<BlockCaptureManagedEntity> &ManagedCaptures);
+
+static std::string getBlockCaptureStr(const BlockCaptureManagedEntity &E,
+ CaptureStrKind StrKind,
+ CharUnits BlockAlignment,
+ CodeGenModule &CGM);
+
+static std::string getBlockDescriptorName(const CGBlockInfo &BlockInfo,
+ CodeGenModule &CGM) {
+ std::string Name = "__block_descriptor_";
+ Name += llvm::to_string(BlockInfo.BlockSize.getQuantity()) + "_";
+
+ if (BlockInfo.needsCopyDisposeHelpers()) {
+ if (CGM.getLangOpts().Exceptions)
+ Name += "e";
+ if (CGM.getCodeGenOpts().ObjCAutoRefCountExceptions)
+ Name += "a";
+ Name += llvm::to_string(BlockInfo.BlockAlign.getQuantity()) + "_";
+
+ SmallVector<BlockCaptureManagedEntity, 4> ManagedCaptures;
+ findBlockCapturedManagedEntities(BlockInfo, CGM.getContext().getLangOpts(),
+ ManagedCaptures);
+
+ for (const BlockCaptureManagedEntity &E : ManagedCaptures) {
+ Name += llvm::to_string(E.Capture->getOffset().getQuantity());
+
+ if (E.CopyKind == E.DisposeKind) {
+ // If CopyKind and DisposeKind are the same, merge the capture
+ // information.
+ assert(E.CopyKind != BlockCaptureEntityKind::None &&
+ "shouldn't see BlockCaptureManagedEntity that is None");
+ Name += getBlockCaptureStr(E, CaptureStrKind::Merged,
+ BlockInfo.BlockAlign, CGM);
+ } else {
+ // If CopyKind and DisposeKind are not the same, which can happen when
+ // either Kind is None or the captured object is a __strong block,
+ // concatenate the copy and dispose strings.
+ Name += getBlockCaptureStr(E, CaptureStrKind::CopyHelper,
+ BlockInfo.BlockAlign, CGM);
+ Name += getBlockCaptureStr(E, CaptureStrKind::DisposeHelper,
+ BlockInfo.BlockAlign, CGM);
+ }
+ }
+ Name += "_";
+ }
+
+ std::string TypeAtEncoding =
+ CGM.getContext().getObjCEncodingForBlock(BlockInfo.getBlockExpr());
+ Name += "e" + llvm::to_string(TypeAtEncoding.size()) + "_" + TypeAtEncoding;
+ Name += "l" + CGM.getObjCRuntime().getRCBlockLayoutStr(CGM, BlockInfo);
+ return Name;
+}
+
/// buildBlockDescriptor - Build the block descriptor meta-data for a block.
/// buildBlockDescriptor is accessed from 5th field of the Block_literal
/// meta-data and contains stationary information about the block literal.
else
i8p = CGM.VoidPtrTy;
+ std::string descName;
+
+ // If an equivalent block descriptor global variable exists, return it.
+ if (C.getLangOpts().ObjC1 &&
+ CGM.getLangOpts().getGC() == LangOptions::NonGC) {
+ descName = getBlockDescriptorName(blockInfo, CGM);
+ if (llvm::GlobalValue *desc = CGM.getModule().getNamedValue(descName))
+ return llvm::ConstantExpr::getBitCast(desc,
+ CGM.getBlockDescriptorType());
+ }
+
+ // If there isn't an equivalent block descriptor global variable, create a new
+ // one.
ConstantInitBuilder builder(CGM);
auto elements = builder.beginStruct();
elements.addInt(ulong, blockInfo.BlockSize.getQuantity());
// Optional copy/dispose helpers.
+ bool hasInternalHelper = false;
if (blockInfo.needsCopyDisposeHelpers()) {
// copy_func_helper_decl
- elements.add(buildCopyHelper(CGM, blockInfo));
+ llvm::Constant *copyHelper = buildCopyHelper(CGM, blockInfo);
+ elements.add(copyHelper);
// destroy_func_decl
- elements.add(buildDisposeHelper(CGM, blockInfo));
+ llvm::Constant *disposeHelper = buildDisposeHelper(CGM, blockInfo);
+ elements.add(disposeHelper);
+
+ if (cast<llvm::Function>(copyHelper->getOperand(0))->hasInternalLinkage() ||
+ cast<llvm::Function>(disposeHelper->getOperand(0))
+ ->hasInternalLinkage())
+ hasInternalHelper = true;
}
// Signature. Mandatory ObjC-style method descriptor @encode sequence.
if (C.getLangOpts().OpenCL)
AddrSpace = C.getTargetAddressSpace(LangAS::opencl_constant);
+ llvm::GlobalValue::LinkageTypes linkage;
+ if (descName.empty()) {
+ linkage = llvm::GlobalValue::InternalLinkage;
+ descName = "__block_descriptor_tmp";
+ } else if (hasInternalHelper) {
+ // If either the copy helper or the dispose helper has internal linkage,
+ // the block descriptor must have internal linkage too.
+ linkage = llvm::GlobalValue::InternalLinkage;
+ } else {
+ linkage = llvm::GlobalValue::LinkOnceODRLinkage;
+ }
+
llvm::GlobalVariable *global =
- elements.finishAndCreateGlobal("__block_descriptor_tmp",
- CGM.getPointerAlign(),
- /*constant*/ true,
- llvm::GlobalValue::InternalLinkage,
- AddrSpace);
+ elements.finishAndCreateGlobal(descName, CGM.getPointerAlign(),
+ /*constant*/ true, linkage, AddrSpace);
+
+ if (linkage == llvm::GlobalValue::LinkOnceODRLinkage) {
+ global->setVisibility(llvm::GlobalValue::HiddenVisibility);
+ global->setUnnamedAddr(llvm::GlobalValue::UnnamedAddr::Global);
+ }
return llvm::ConstantExpr::getBitCast(global, CGM.getBlockDescriptorType());
}
return fn;
}
-namespace {
-
-/// Represents a type of copy/destroy operation that should be performed for an
-/// entity that's captured by a block.
-enum class BlockCaptureEntityKind {
- CXXRecord, // Copy or destroy
- ARCWeak,
- ARCStrong,
- NonTrivialCStruct,
- BlockObject, // Assign or release
- None
-};
-
-/// Represents a captured entity that requires extra operations in order for
-/// this entity to be copied or destroyed correctly.
-struct BlockCaptureManagedEntity {
- BlockCaptureEntityKind Kind;
- BlockFieldFlags Flags;
- const BlockDecl::Capture *CI;
- const CGBlockInfo::Capture *Capture;
-
- BlockCaptureManagedEntity(BlockCaptureEntityKind Type, BlockFieldFlags Flags,
- const BlockDecl::Capture &CI,
- const CGBlockInfo::Capture &Capture)
- : Kind(Type), Flags(Flags), CI(&CI), Capture(&Capture) {}
-
- bool operator<(const BlockCaptureManagedEntity &Other) const {
- return Capture->getOffset() < Other.Capture->getOffset();
- }
-};
-
-} // end anonymous namespace
-
static std::pair<BlockCaptureEntityKind, BlockFieldFlags>
computeCopyInfoForBlockCapture(const BlockDecl::Capture &CI, QualType T,
const LangOptions &LangOpts) {
llvm_unreachable("after exhaustive PrimitiveCopyKind switch");
}
+static std::pair<BlockCaptureEntityKind, BlockFieldFlags>
+computeDestroyInfoForBlockCapture(const BlockDecl::Capture &CI, QualType T,
+ const LangOptions &LangOpts);
+
/// Find the set of block captures that need to be explicitly copied or destroy.
static void findBlockCapturedManagedEntities(
const CGBlockInfo &BlockInfo, const LangOptions &LangOpts,
- SmallVectorImpl<BlockCaptureManagedEntity> &ManagedCaptures,
- llvm::function_ref<std::pair<BlockCaptureEntityKind, BlockFieldFlags>(
- const BlockDecl::Capture &, QualType, const LangOptions &)>
- Predicate) {
+ SmallVectorImpl<BlockCaptureManagedEntity> &ManagedCaptures) {
for (const auto &CI : BlockInfo.getBlockDecl()->captures()) {
const VarDecl *Variable = CI.getVariable();
const CGBlockInfo::Capture &Capture = BlockInfo.getCapture(Variable);
if (Capture.isConstant())
continue;
- auto Info = Predicate(CI, Variable->getType(), LangOpts);
- if (Info.first != BlockCaptureEntityKind::None)
- ManagedCaptures.emplace_back(Info.first, Info.second, CI, Capture);
+ auto CopyInfo =
+ computeCopyInfoForBlockCapture(CI, Variable->getType(), LangOpts);
+ auto DisposeInfo =
+ computeDestroyInfoForBlockCapture(CI, Variable->getType(), LangOpts);
+ if (CopyInfo.first != BlockCaptureEntityKind::None ||
+ DisposeInfo.first != BlockCaptureEntityKind::None)
+ ManagedCaptures.emplace_back(CopyInfo.first, DisposeInfo.first,
+ CopyInfo.second, DisposeInfo.second, CI,
+ Capture);
}
// Sort the captures by offset.
return false;
}
-static std::string getCopyDestroyHelperFuncName(
- const SmallVectorImpl<BlockCaptureManagedEntity> &Captures,
- CharUnits BlockAlignment, bool IsCopyHelper, CodeGenModule &CGM) {
+// Return a string that has the information about a capture.
+static std::string getBlockCaptureStr(const BlockCaptureManagedEntity &E,
+ CaptureStrKind StrKind,
+ CharUnits BlockAlignment,
+ CodeGenModule &CGM) {
+ std::string Str;
ASTContext &Ctx = CGM.getContext();
std::unique_ptr<ItaniumMangleContext> MC(
ItaniumMangleContext::create(Ctx, Ctx.getDiagnostics()));
+ const BlockDecl::Capture &CI = *E.CI;
+ QualType CaptureTy = CI.getVariable()->getType();
- std::string Name =
- IsCopyHelper ? "__copy_helper_block_" : "__destroy_helper_block_";
+ BlockCaptureEntityKind Kind;
+ BlockFieldFlags Flags;
+
+ // CaptureStrKind::Merged should be passed only when the operations and the
+ // flags are the same for copy and dispose.
+ assert((StrKind != CaptureStrKind::Merged ||
+ (E.CopyKind == E.DisposeKind && E.CopyFlags == E.DisposeFlags)) &&
+ "different operations and flags");
+
+ if (StrKind == CaptureStrKind::DisposeHelper) {
+ Kind = E.DisposeKind;
+ Flags = E.DisposeFlags;
+ } else {
+ Kind = E.CopyKind;
+ Flags = E.CopyFlags;
+ }
+
+ switch (Kind) {
+ case BlockCaptureEntityKind::CXXRecord: {
+ Str += "c";
+ SmallString<256> TyStr;
+ llvm::raw_svector_ostream Out(TyStr);
+ MC->mangleTypeName(CaptureTy, Out);
+ Str += llvm::to_string(TyStr.size()) + TyStr.c_str();
+ break;
+ }
+ case BlockCaptureEntityKind::ARCWeak:
+ Str += "w";
+ break;
+ case BlockCaptureEntityKind::ARCStrong:
+ Str += "s";
+ break;
+ case BlockCaptureEntityKind::BlockObject: {
+ const VarDecl *Var = CI.getVariable();
+ unsigned F = Flags.getBitMask();
+ if (F & BLOCK_FIELD_IS_BYREF) {
+ Str += "r";
+ if (F & BLOCK_FIELD_IS_WEAK)
+ Str += "w";
+ else {
+ // If CaptureStrKind::Merged is passed, check both the copy expression
+ // and the destructor.
+ if (StrKind != CaptureStrKind::DisposeHelper) {
+ if (Ctx.getBlockVarCopyInit(Var).canThrow())
+ Str += "c";
+ }
+ if (StrKind != CaptureStrKind::CopyHelper) {
+ if (CodeGenFunction::cxxDestructorCanThrow(CaptureTy))
+ Str += "d";
+ }
+ }
+ } else {
+ assert((F & BLOCK_FIELD_IS_OBJECT) && "unexpected flag value");
+ if (F == BLOCK_FIELD_IS_BLOCK)
+ Str += "b";
+ else
+ Str += "o";
+ }
+ break;
+ }
+ case BlockCaptureEntityKind::NonTrivialCStruct: {
+ bool IsVolatile = CaptureTy.isVolatileQualified();
+ CharUnits Alignment =
+ BlockAlignment.alignmentAtOffset(E.Capture->getOffset());
+
+ Str += "n";
+ std::string FuncStr;
+ if (StrKind == CaptureStrKind::DisposeHelper)
+ FuncStr = CodeGenFunction::getNonTrivialDestructorStr(
+ CaptureTy, Alignment, IsVolatile, Ctx);
+ else
+ // If CaptureStrKind::Merged is passed, use the copy constructor string.
+ // It has all the information that the destructor string has.
+ FuncStr = CodeGenFunction::getNonTrivialCopyConstructorStr(
+ CaptureTy, Alignment, IsVolatile, Ctx);
+ // The underscore is necessary here because non-trivial copy constructor
+ // and destructor strings can start with a number.
+ Str += llvm::to_string(FuncStr.size()) + "_" + FuncStr;
+ break;
+ }
+ case BlockCaptureEntityKind::None:
+ break;
+ }
+
+ return Str;
+}
+
+static std::string getCopyDestroyHelperFuncName(
+ const SmallVectorImpl<BlockCaptureManagedEntity> &Captures,
+ CharUnits BlockAlignment, CaptureStrKind StrKind, CodeGenModule &CGM) {
+ assert((StrKind == CaptureStrKind::CopyHelper ||
+ StrKind == CaptureStrKind::DisposeHelper) &&
+ "unexpected CaptureStrKind");
+ std::string Name = StrKind == CaptureStrKind::CopyHelper
+ ? "__copy_helper_block_"
+ : "__destroy_helper_block_";
if (CGM.getLangOpts().Exceptions)
Name += "e";
if (CGM.getCodeGenOpts().ObjCAutoRefCountExceptions)
Name += llvm::to_string(BlockAlignment.getQuantity()) + "_";
for (const BlockCaptureManagedEntity &E : Captures) {
- const BlockDecl::Capture &CI = *E.CI;
- BlockFieldFlags Flags = E.Flags;
- QualType CaptureTy = CI.getVariable()->getType();
Name += llvm::to_string(E.Capture->getOffset().getQuantity());
-
- switch (E.Kind) {
- case BlockCaptureEntityKind::CXXRecord: {
- Name += "c";
- SmallString<256> Str;
- llvm::raw_svector_ostream Out(Str);
- MC->mangleTypeName(CaptureTy, Out);
- Name += llvm::to_string(Str.size()) + Str.c_str();
- break;
- }
- case BlockCaptureEntityKind::ARCWeak:
- Name += "w";
- break;
- case BlockCaptureEntityKind::ARCStrong:
- Name += "s";
- break;
- case BlockCaptureEntityKind::BlockObject: {
- const VarDecl *Var = CI.getVariable();
- unsigned F = Flags.getBitMask();
- if (F & BLOCK_FIELD_IS_BYREF) {
- Name += "r";
- if (F & BLOCK_FIELD_IS_WEAK)
- Name += "w";
- else {
- if (IsCopyHelper) {
- if (Ctx.getBlockVarCopyInit(Var).canThrow())
- Name += "c";
- } else {
- if (CodeGenFunction::cxxDestructorCanThrow(CaptureTy))
- Name += "d";
- }
- }
- } else {
- assert((F & BLOCK_FIELD_IS_OBJECT) && "unexpected flag value");
- if (F == BLOCK_FIELD_IS_BLOCK)
- Name += "b";
- else
- Name += "o";
- }
- break;
- }
- case BlockCaptureEntityKind::NonTrivialCStruct: {
- bool IsVolatile = CaptureTy.isVolatileQualified();
- CharUnits Alignment =
- BlockAlignment.alignmentAtOffset(E.Capture->getOffset());
-
- Name += "n";
- std::string Str;
- if (IsCopyHelper)
- Str = CodeGenFunction::getNonTrivialCopyConstructorStr(
- CaptureTy, Alignment, IsVolatile, Ctx);
- else
- Str = CodeGenFunction::getNonTrivialDestructorStr(CaptureTy, Alignment,
- IsVolatile, Ctx);
- // The underscore is necessary here because non-trivial copy constructor
- // and destructor strings can start with a number.
- Name += llvm::to_string(Str.size()) + "_" + Str;
- break;
- }
- case BlockCaptureEntityKind::None:
- llvm_unreachable("unexpected block capture kind");
- }
+ Name += getBlockCaptureStr(E, StrKind, BlockAlignment, CGM);
}
return Name;
break;
}
case BlockCaptureEntityKind::None:
- llvm_unreachable("unexpected BlockCaptureEntityKind");
+ break;
}
}
llvm::Constant *
CodeGenFunction::GenerateCopyHelperFunction(const CGBlockInfo &blockInfo) {
SmallVector<BlockCaptureManagedEntity, 4> CopiedCaptures;
- findBlockCapturedManagedEntities(blockInfo, getLangOpts(), CopiedCaptures,
- computeCopyInfoForBlockCapture);
+ findBlockCapturedManagedEntities(blockInfo, getLangOpts(), CopiedCaptures);
std::string FuncName =
getCopyDestroyHelperFuncName(CopiedCaptures, blockInfo.BlockAlign,
- /*IsCopyHelper*/ true, CGM);
+ CaptureStrKind::CopyHelper, CGM);
if (llvm::GlobalValue *Func = CGM.getModule().getNamedValue(FuncName))
return llvm::ConstantExpr::getBitCast(Func, VoidPtrTy);
const BlockDecl::Capture &CI = *CopiedCapture.CI;
const CGBlockInfo::Capture &capture = *CopiedCapture.Capture;
QualType captureType = CI.getVariable()->getType();
- BlockFieldFlags flags = CopiedCapture.Flags;
+ BlockFieldFlags flags = CopiedCapture.CopyFlags;
unsigned index = capture.getIndex();
Address srcField = Builder.CreateStructGEP(src, index, capture.getOffset());
Address dstField = Builder.CreateStructGEP(dst, index, capture.getOffset());
- switch (CopiedCapture.Kind) {
+ switch (CopiedCapture.CopyKind) {
case BlockCaptureEntityKind::CXXRecord:
// If there's an explicit copy expression, we do that.
assert(CI.getCopyExpr() && "copy expression for variable is missing");
break;
}
case BlockCaptureEntityKind::None:
- llvm_unreachable("unexpected BlockCaptureEntityKind");
+ continue;
}
// Ensure that we destroy the copied object if an exception is thrown later
// in the helper function.
- pushCaptureCleanup(CopiedCapture.Kind, dstField, captureType, flags,
+ pushCaptureCleanup(CopiedCapture.CopyKind, dstField, captureType, flags,
/*ForCopyHelper*/ true, CI.getVariable(), *this);
}
llvm::Constant *
CodeGenFunction::GenerateDestroyHelperFunction(const CGBlockInfo &blockInfo) {
SmallVector<BlockCaptureManagedEntity, 4> DestroyedCaptures;
- findBlockCapturedManagedEntities(blockInfo, getLangOpts(), DestroyedCaptures,
- computeDestroyInfoForBlockCapture);
+ findBlockCapturedManagedEntities(blockInfo, getLangOpts(), DestroyedCaptures);
std::string FuncName =
getCopyDestroyHelperFuncName(DestroyedCaptures, blockInfo.BlockAlign,
- /*IsCopyHelper*/ false, CGM);
+ CaptureStrKind::DisposeHelper, CGM);
if (llvm::GlobalValue *Func = CGM.getModule().getNamedValue(FuncName))
return llvm::ConstantExpr::getBitCast(Func, VoidPtrTy);
for (const auto &DestroyedCapture : DestroyedCaptures) {
const BlockDecl::Capture &CI = *DestroyedCapture.CI;
const CGBlockInfo::Capture &capture = *DestroyedCapture.Capture;
- BlockFieldFlags flags = DestroyedCapture.Flags;
+ BlockFieldFlags flags = DestroyedCapture.DisposeFlags;
Address srcField =
Builder.CreateStructGEP(src, capture.getIndex(), capture.getOffset());
- pushCaptureCleanup(DestroyedCapture.Kind, srcField,
+ pushCaptureCleanup(DestroyedCapture.DisposeKind, srcField,
CI.getVariable()->getType(), flags,
/*ForCopyHelper*/ false, CI.getVariable(), *this);
}
// RUN: %clang_cc1 -triple x86_64-apple-darwin10 -emit-llvm -fblocks -fobjc-arc -fobjc-runtime-has-weak -o - %s | FileCheck -check-prefix=CHECK-UNOPT -check-prefix=CHECK-COMMON %s
// CHECK-COMMON: %[[STRUCT_BLOCK_DESCRIPTOR:.*]] = type { i64, i64 }
-// CHECK-COMMON: @{{.*}} = internal constant { i64, i64, i8*, i8*, i8*, i64 } { i64 0, i64 40, i8* bitcast (void (i8*, i8*)* @__copy_helper_block_8_32r to i8*), i8* bitcast (void (i8*)* @__destroy_helper_block_8_32r to i8*), i8* getelementptr inbounds ([6 x i8], [6 x i8]* @{{.*}}, i32 0, i32 0), i64 16 }, align 8
-// CHECK-COMMON: @[[BLOCK_DESCRIPTOR_TMP9:.*]] = internal constant { i64, i64, i8*, i8*, i8*, i64 } { i64 0, i64 40, i8* bitcast (void (i8*, i8*)* @__copy_helper_block_8_32r to i8*), i8* bitcast (void (i8*)* @__destroy_helper_block_8_32r to i8*), i8* getelementptr inbounds ([6 x i8], [6 x i8]* @{{.*}}, i32 0, i32 0), i64 16 }, align 8
-// CHECK-COMMON: @{{.*}} = internal constant { i64, i64, i8*, i8*, i8*, i64 } { i64 0, i64 40, i8* bitcast (void (i8*, i8*)* @__copy_helper_block_8_32s to i8*), i8* bitcast (void (i8*)* @__destroy_helper_block_8_32s to i8*), i8* getelementptr inbounds ([6 x i8], [6 x i8]* @{{.*}}, i32 0, i32 0), i64 256 }, align 8
-// CHECK-COMMON: @{{.*}} = internal constant { i64, i64, i8*, i8*, i8*, i64 } { i64 0, i64 40, i8* bitcast (void (i8*, i8*)* @__copy_helper_block_8_32s to i8*), i8* bitcast (void (i8*)* @__destroy_helper_block_8_32s to i8*), i8* getelementptr inbounds ([6 x i8], [6 x i8]* @{{.*}}, i32 0, i32 0), i64 256 }, align 8
-// CHECK-COMMON: @{{.*}} = internal constant { i64, i64, i8*, i8*, i8*, i64 } { i64 0, i64 40, i8* bitcast (void (i8*, i8*)* @__copy_helper_block_8_32s to i8*), i8* bitcast (void (i8*)* @__destroy_helper_block_8_32s to i8*), i8* getelementptr inbounds ([6 x i8], [6 x i8]* @{{.*}}, i32 0, i32 0), i64 256 }, align 8
-// CHECK-COMMON: @{{.*}} = internal constant { i64, i64, i8*, i8*, i8*, i64 } { i64 0, i64 40, i8* bitcast (void (i8*, i8*)* @__copy_helper_block_8_32s to i8*), i8* bitcast (void (i8*)* @__destroy_helper_block_8_32s to i8*), i8* getelementptr inbounds ([6 x i8], [6 x i8]* @{{.*}}, i32 0, i32 0), i64 256 }, align 8
-// CHECK-COMMON: @[[BLOCK_DESCRIPTOR_TMP44:.*]] = internal constant { i64, i64, i8*, i8*, i8*, i64 } { i64 0, i64 40, i8* bitcast (void (i8*, i8*)* @__copy_helper_block_8_32s to i8*), i8* bitcast (void (i8*)* @__destroy_helper_block_8_32s to i8*), i8* getelementptr inbounds ([6 x i8], [6 x i8]* @{{.*}}, i32 0, i32 0), i64 256 }, align 8
-// CHECK-COMMON: @[[BLOCK_DESCRIPTOR_TMP46:.*]] = internal constant { i64, i64, i8*, i8*, i8*, i8* } { i64 0, i64 48, i8* bitcast (void (i8*, i8*)* @__copy_helper_block_8_32s to i8*), i8* bitcast (void (i8*)* @__destroy_helper_block_8_32s to i8*), i8* getelementptr inbounds ([6 x i8], [6 x i8]* @{{.*}}, i32 0, i32 0), i8* getelementptr inbounds ([3 x i8], [3 x i8]* @{{.*}}, i32 0, i32 0) }, align 8
-// CHECK-COMMON: @[[BLOCK_DESCRIPTOR_TMP48:.*]] = internal constant { i64, i64, i8*, i8*, i8*, i64 } { i64 0, i64 40, i8* bitcast (void (i8*, i8*)* @__copy_helper_block_8_32b to i8*), i8* bitcast (void (i8*)* @__destroy_helper_block_8_32s to i8*), i8* getelementptr inbounds ([9 x i8], [9 x i8]* @.str.47, i32 0, i32 0), i64 256 }, align 8
+// CHECK-COMMON: @[[BLOCK_DESCRIPTOR_TMP44:.*]] = linkonce_odr hidden unnamed_addr constant { i64, i64, i8*, i8*, i8*, i64 } { i64 0, i64 40, i8* bitcast (void (i8*, i8*)* @__copy_helper_block_8_32s to i8*), i8* bitcast (void (i8*)* @__destroy_helper_block_8_32s to i8*), i8* getelementptr inbounds ([6 x i8], [6 x i8]* @{{.*}}, i32 0, i32 0), i64 256 }, align 8
+// CHECK-COMMON: @[[BLOCK_DESCRIPTOR_TMP9:.*]] = linkonce_odr hidden unnamed_addr constant { i64, i64, i8*, i8*, i8*, i64 } { i64 0, i64 40, i8* bitcast (void (i8*, i8*)* @__copy_helper_block_8_32r to i8*), i8* bitcast (void (i8*)* @__destroy_helper_block_8_32r to i8*), i8* getelementptr inbounds ([6 x i8], [6 x i8]* @{{.*}}, i32 0, i32 0), i64 16 }, align 8
+// CHECK-COMMON: @[[BLOCK_DESCRIPTOR_TMP46:.*]] = linkonce_odr hidden unnamed_addr constant { i64, i64, i8*, i8*, i8*, i8* } { i64 0, i64 48, i8* bitcast (void (i8*, i8*)* @__copy_helper_block_8_32s to i8*), i8* bitcast (void (i8*)* @__destroy_helper_block_8_32s to i8*), i8* getelementptr inbounds ([6 x i8], [6 x i8]* @{{.*}}, i32 0, i32 0), i8* getelementptr inbounds ([3 x i8], [3 x i8]* @{{.*}}, i32 0, i32 0) }, align 8
+// CHECK-COMMON: @[[BLOCK_DESCRIPTOR_TMP48:.*]] = linkonce_odr hidden unnamed_addr constant { i64, i64, i8*, i8*, i8*, i64 } { i64 0, i64 40, i8* bitcast (void (i8*, i8*)* @__copy_helper_block_8_32b to i8*), i8* bitcast (void (i8*)* @__destroy_helper_block_8_32s to i8*), i8* getelementptr inbounds ([9 x i8], [9 x i8]* @{{.*}}, i32 0, i32 0), i64 256 }, align 8
// This shouldn't crash.
void test0(id (^maker)(void)) {
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