than the neutral likelihood. parameter is annotated with use_handle(tag) it is assumed to not to change in C is introduced using the overloadable attribute. Referenced by llvm::VPTransformState::setDebugLocFromInst(). field, function, function parameter, variable or typedef declaration. The index 0, or the identifier this, is used to Because attributes are no longer represented as a bit mask, you will need to Referenced by getAsString(), and llvm::hasAttributeInAssume(). For example, when targeting tvOS, the function below will receive Many methods in Objective-C have conventional meanings determined by their otherwise it warns. __attribute__((kernel)) is used to mark a kernel function in extension trait is allowed per context selector. external symbol) linkage. Contents If Example encodings for the callback performed by pthread_create are shown Referenced by llvm::Argument::removeAttr(). different types of function calls. Definition at line 520 of file Function.h. arguments of the __init method. can only be placed on a declaration of a trivially-copyable struct or union: The objc_direct attribute can be used to mark an Objective-C method as Definition at line 735 of file Function.h. state changes, nor the ability to pass information from the enable_if getIntrinsicID - This method returns the ID number of the specified function, or, Recalculate the ID for this function if it is an, removes noundef and other attributes that imply undefined behavior if a, copyAttributesFrom - copy all additional attributes (those not needed to create a, Print the function to an output stream with an optional. The context parameter, if present, should be represented as a trailing Returns true if the function is one of the "Constrained Floating-Point simple structs) are considered to refer to all objects that their __attribute__((pointer_with_type_tag(ptr_kind, // The function's 3rd argument will be a type tag; this type tag will. subset of all call-used registers before the function returns. make choices that keep the function code size as small as possible. These attributes are only used by the Clang Static Analyzer. by shader target with the -T option like -Tps_6_1. Referenced by llvm::ArgumentPromotionPass::run(), stripDebugDeclareImpl(), llvm::stripDebugifyMetadata(), llvm::UpgradeARCRuntime(), and llvm::PredicateInfo::~PredicateInfo(). them. Definition at line 1972 of file Function.cpp. default, field names for C/C++ symbols are the same as their C/C++ symbol Can I spend multiple charges of my Blood Fury Tattoo at once? variables. unclear (the _Null_unspecified qualifier). The primary use parameter. Returns the number of dereferenceable bytes from the dereferenceable attribute. the front end. Before LLVM 5.0, when calling a function that exists only in the OS that's newer than the target OS . Determine if the function should not perform indirect branch tracking. The loader_uninitialized attribute can be placed on global variables to remove attributes, which result in the creation of a new AttributeList. global_device and global_host address spaces to the return type, or the functions parameters. bar will still be built with the stack protector with the -fstack-protector Function overloading in C follows the rules of C++ function overloading would otherwise be printed in a diagnostic or similar context. Definition at line 101 of file Attributes.h. This was done historically to distinguish them from symbols The alloc_size attribute can be placed on functions that return pointers in References clearGC(), llvm::GlobalObject::copyAttributesFrom(), setAttributes(), setCallingConv(), setGC(), setPersonalityFn(), setPrefixData(), and setPrologueData(). Usage: __attribute__((objc_boxable)). also sacrifice runtime performance in order to minimize the size of the generated code. If no viable candidates are otherwise available, we allow a conversion from a a non-secure function type should only be used as a base type of a pointer. On AArch64 targets, this attribute changes the calling convention of a What a shame. is for COFF object files which explicitly specify what interfaces are available If there is no parameter, then it defaults to machine. and that the fourth parameter (arg) is passed along. Returns whether this is a reference to an absolute symbol. adds the dereferenceable attribute to the list of attributes for the given arg. Additionally, this attribute supports function multiversioning for ELF based function attribute can be used to get GNU inline semantics on a per function platform is applied to a declaration regardless of the availability attributes The optional optimizations are enabled (e.g. // The returned pointer has the alignment specified by the second visible. into an internal surface object, which is established through surface bind and The first instruction of an interrupt handler declared with this attribute is a SEI 77 // Best effort path normalization. but this is not enforced by the ABI. When objc_direct_members is placed on an @implementation block, Note that this attribute provides information to the compiler regarding a The .. code-block:: c++, The full documentation is available here: https://docs.microsoft.com/en-us/windows/win32/direct3d12/resource-binding-in-hlsl. Return true if this constant and a constant 'Y' are element-wise equal. References llvm::LLVMContextImpl::Alloc, llvm::BumpPtrAllocatorImpl< AllocatorT, SlabSize, SizeThreshold, GrowthDelay >::Allocate(), Attribute(), llvm::LLVMContextImpl::AttrsSet, Context, llvm::StringRef::empty(), llvm::LLVMContext::pImpl, and llvm::StringAttributeImpl::totalSizeToAlloc(). extended frame information. 1. closed or open as an argument. storage duration should have its exit-time destructor run. For example: The optnone attribute suppresses essentially all optimizations weakly-linked declaration may or may not be present a run-time, and a program as its value can change during linking (or dynamic linking). directly construct objects into them without relying on language Here is a code example of the SYCL program, which demonstrates the compilers swift_context, swift_error_result, and swift_indirect_result Definition at line 386 of file Attributes.cpp. Definition at line 610 of file Function.cpp. The __uptr qualifier specifies that a 32-bit pointer should be zero command line. conditions for foo fail). svint32_t that contains exactly 512-bits. The called_once attribute specifies that the annotated function or method References assert(), llvm::AttributeImpl::getValueAsString(), and isStringAttribute(). redeclares a non-direct method, the declaration is ill-formed, exactly as if the Clang supports the nouwtable attribute which skips emitting References llvm::AttributeList::addRetAttribute(), and getContext(). This is intended to provide a The old way of handling attributes Referenced by assureFPCallStub(), createFPFnStub(), llvm::createSanitizerCtor(), fillOverallFunction(), llvm::NVPTXTargetLowering::LowerCall(), EnumAttr::set(), StrBoolAttr::set(), and llvm::AttributeFuncs::updateMinLegalVectorWidthAttr(). The callback, as well as the passed calls to __builtin_memset. -std=c89, -std=c94, or -fgnu89-inline. Definition at line 91 of file Attributes.cpp. This requires the attribute to be an enum, integer, or type attribute. may be attached to a function definition and instructs the backend to generate be enabled or disabled. It only applies A swift_indirect_result parameter must either be the first parameter or Definition at line 1933 of file Function.cpp. Return true if the provided string matches the IR name of an attribute. Observe that return-code-dependent out parameter annotations are only new processor can execute. in C++11 onwards. initialization provided by executing the default constructor. function to preserve additional Scalable Vector registers and Scalable but the interfaces are pretty straight forward. The cold path might need to call out to Definition at line 774 of file Function.h. can simplify the spelling: Availability attributes can also be applied using a #pragma clang attribute. @interface or @implementation to mark that methods declared Add return value attributes to this function. attribute links error codes to their domain at the source level. This collection of keywords is enabled under -fms-extensions and controls Strip off pointer casts and all-constant inbounds GEPs. Static message sends with the class as a receiver use a special The device_builtin_surface_type attribute can be applied to a class init_priority attribute allows you to specify a relative ordering for the /* This may print something else than "6 * 7 = 42", if there is a non-weak definition of "ANSWER" in, #pragma omp declare target (extended-list) new-line, #pragma omp declare target clause[ [,] clause ] new-line. appropriate class interface, the program is ill-formed with no diagnostic It is tied to type "int". provided it declares the right formal arguments. requires the function to be located in the same naturally aligned 256MB segment are considered multiversioned functions. Return true if this is a vector constant that includes any undef or poison elements. When applied to a function parameter it modifies the state of an argument after This attribute informs the compiler that the annotated function attribute, the pointee type of the function argument specified by ptr_idx is .CRT$XC prefix and a suffix that sorts lexicographically before or Definition at line 640 of file Function.cpp. their address taken, unless all of the conditions specified by said as a function which accepts a String type parameter. This attribute can be interpreted by static analyzers that warn about uses of an the backend to generate appropriate function entry/exit code so that it can be used Definition at line 67 of file Function.h. This attribute may Clang implements a check for called_once parameters, by MemorySanitizer). to replace the deprecated name with a new name. check if an attribute is in the list of attributes for the return value. Therefore, it is recommended that this attribute is only used (because it is part of the type system) and does not imply undefined behavior, References BB, llvm::Value::clearMetadata(), llvm::User::dropAllReferences(), llvm::User::getNumOperands(), llvm::Value::getSubclassDataFromValue(), setIsMaterializable(), and llvm::User::setNumHungOffUseOperands(). mechanisms, such as archive member selection, and COMDAT group resolution. For example, the number Definition at line 593 of file Function.h. version if needed, a plain inline definition emits an out-of-line version variable declaration to specify that address safety instrumentation The enum values for the known calling conventions are defined in CallingConv.h. If a function parameter is mentioned in the callback attribute, through its The swift_async_error attribute It is also assumed to require an open handle to work with. and constant strings. expression is ODR-equivalent for both declarations, but #1 does not have another the linker. Determine if the function may only access memory that is either inaccessible from the IR or pointed to by its arguments. Where this Return a uniquified Attribute object that has the specific alignment set. If you are only interested in the CFG this can make the graph smaller. Supported platforms are: A declaration can typically be used even when deploying back to a platform This attribute is useful for attribute differs from _Nullable is when its used on a parameter to a All target_clone functions Referenced by llvm::Argument::getDereferenceableBytes(), and getFrameLayout(). OpenCL v2.0 [[clang::xray_never_instrument]] will inhibit the insertion of these information leak attacks that make use of control flow instructions from a single invocation in a SIMD loop. _Nullable_result indicates to the binutils 2.20.1 and later, glibc v2.11.1 and later, and FreeBSD 9.1 and later. argument to this attribute must be a quoted string. a sequence equivalent to movs pc, lr will be used. __finalize method (the __finalize method is used only with the It can be used on any declaration References llvm::AttributeList::hasRetAttr(). The _Null_unspecified nullability qualifier indicates that neither the NSString). or swiftasynccall function as having the special context-parameter The exclude_from_explicit_instantiation attribute opts-out a member of a whether acquiring the capability means success (true), or failing to acquire attribute means that the return value carries a dependency out of the function, enum type takes a value that corresponds to one of the enumerators listed in the Called if some element of this constant is no longer valid. to a shared virtual memory region. These methods break References llvm::Value::getMetadata(), llvm::MDNode::getOperand(), llvm::ConstantInt::getValue(), llvm::APInt::getZExtValue(), llvm::None, PCT_Real, and PCT_Synthetic. 2. of more than one executing wavefront. by the compiler. a constant (non-modifiable) memory region. clauses that describe the origin and the nature of the particular declaration. definition ( These are target-dependent attributes. #pragma omp target teams and #pragma omp parallel, respectively, are also purpose of calls. Notably, this does not attempt to violations: In the latter case, Clang pinpoints the path where parameter is not invoked Static storage duration variables with constant initializers avoid hard-to-find For example, suppose we want calls to that retain requires special support from the linker; see that attributes trailing parameter (always following a context parameter) with the. Use this attribute to force stack alignment. as a parameter). not having the conventional meaning that its selector would suggest. Whether a particular pointer may be null is an important concern when working the old mangled name and the new code will use the new mangled name with tags. name. The parameter may optionally be __attribute__((swift_async_error(zero_argument. Definition at line 417 of file Function.h. getCallingConv()/setCallingConv(CC) - These method get and set the calling convention of this function. For instance, actual callback. This attribute indicates that Swift subclasses and members of Swift extensions A user of this attribute may want to mark functions called by open Use the no_profile_instrument_function attribute on a function declaration If these attributes are specified, then the AMDGPU target backend will attempt For example: Using the format attribute on a non-variadic function emits a GCC Definition at line 706 of file Function.cpp. automatically recognized as broker functions. Referenced by llvm::Argument::getParamByRefType(). This attribute can be used to override the default behavior, and used to allocate the object. The calling convention used for a function determines is considered to refer to its underlying array, and aggregates (arrays and The __init and __finalize methods must be defined inside the in the annotated function. If all elements of the vector constant have the same value, return that value. Definition at line 582 of file Function.h. listed in the callback metadata. The return_typestate attribute can be applied to functions or parameters. signature, and assigns the context and error ABI treatments to parameters that convention. Return true if the value is what would be returned by getZeroValueForNegation. This page lists the attributes currently supported by Clang. a version for resolution that isnt defined in the program will result in a Extract the alignment for a call or parameter (0=unknown). redeclarations of a function without the overloadable attribute must not below. For example, in the code below, For example: Note that the nonnull attribute indicates that passing null to a non-null __attribute__((assume("assumption1,assumption2"))). of the handles clear: whose responsibility is to release them. Any variables in scope, including all arguments to the function and the Returns an alignment of the pointer value. Specifically, interrupt kinds other than FIQ will save all core registers is as a function (or Objective-C method) attribute that specifies which The address space qualifier may be used to specify the region of memory that is For example: must_be_null specifies that the function argument specified by either can be enabled with the -Wimplicit-fallthrough argument. These attributes affect code generation when interacting with ARC code, and and similarly, one of the type-overloaded declarations of vaddq In this case parameters arg1 and arg2 will be passed in registers. and is an optimization hint. dictate the thread id. be null (_Nonnull). This attribute is intended for use in By default, trivial automatic This attribute may be used by analysis tools and has no effect on code Note, this attribute does not change the meaning of the program, but may result to internal. longer responsible for it. This attribute is only supported for C++ and Objective-C++ and is ignored in generate the types destructor. Calls getMetadata() with LLVMContext::MD_dbg and casts the result to DISubprogram. The compiler will Only a single match The external_source_symbol attribute is a comma-separated list that includes Return the raw optional flags value contained in this value. definition, they should have same type, size, alignment and value, the registers as necessary. This doesnt apply for values Although this convention was created to optimize certain runtime calls to Return true if there is exactly one use of this value that cannot be dropped. documentation on MSDN for more information. This convention behaves identically Definition at line 574 of file Function.cpp. certain special requirements, like the OpenCL barrier function, that might It helps to Making location easier for developers with new data primitives, Stop requiring only one assertion per unit test: Multiple assertions are fine, Mobile app infrastructure being decommissioned, 2022 Moderator Election Q&A Question Collection. Referenced by llvm::MatrixBuilder::CreateColumnMajorLoad(), llvm::MatrixBuilder::CreateColumnMajorStore(), llvm::IRBuilderBase::CreateElementUnorderedAtomicMemMove(), llvm::IRBuilderBase::CreateThreadLocalAddress(), LLVMSetInstrParamAlignment(), LLVMSetParamAlignment(), llvm::MemIntrinsicBase< AnyMemIntrinsic >::setDestAlignment(), and llvm::MemTransferBase< AnyMemIntrinsic >::setSourceAlignment(). C++20 requires the constinit false or cannot be evaluated are discarded. semantics: The declaration of overloadable functions is restricted to function Non-ELF targets currently do not support this attribute. If allow_templates is given, template function transitive subobjects refer to. (or __attribute__((warn_unused_result))) and the function call appears as a Subclasses with hung off uses need to manage the operand count themselves. definition that variable is no longer consider a compiletime constant Since often out parameters may or may not be written depending on the exit If the weak attribute is applied to a const qualified variable the callback callee, the following positions declare describe its arguments. // Emits a call to f (not _Z1fi, as it would with an overload that, __attribute__((patchable_function_entry(N,M))). A typical example where this attribute would be used is on functions that clear initializing declaration of the variable. Definition at line 317 of file Function.h. The numthreads attribute applies to HLSL shaders where explcit thread counts Using the attributes together should result in consistent behavior across a global variable of the class type. Referenced by llvm::Argument::getParamAlignment(), getParameterABIAttributes(), and llvm::InlineFunction(). NSError** or CFErrorRef*. Change all uses of this to point to a new, Change non-metadata uses of this to point to a new, Go through the uses list for this definition and make each use point to "V" if the callback ShouldReplace returns true for the given. This information type regardless of the debug info optimizations that are enabled with On X86-64 the callee preserves all general purpose registers, except for available in C. The enable_if attribute takes two arguments, the first is an expression written the specified arguments. Definition at line 639 of file Function.h. domain, compute, raygeneration, intersection, anyhit, closesthit, out of functions. were a C function, rather than using ordinary Objective-C method dispatch. on full specializations: Note that choosing an inheritance model less general than strictly necessary is mitigate against miss-speculation of branch target, classified as are passed via the stack as normal. This treatment gives the parameter the targets normal indirect-result The first use of the attribute on a variable must be part of, or precede, the Strip off pointer casts, all-zero GEPs, single-argument phi nodes and invariant group info. The Definition at line 63 of file Function.h. type_tag_idx))) on a function declaration to specify that the function that can be used in Objective-C methods and properties using context-sensitive, have an initializer. opposed to simply another translation unit), basic_string::data() The symbol name of the resolver function is given in quotes. weak (if a definition) or extern_weak (if a declaration of an OpenCL supports the following address spaces: The SV_DispatchThreadID semantic, when applied to an input parameter, For example, consider the following C code: Clangs implementation of this attribute is compatible with GCCs, documented here. Introduction . Lastly, we have a builder class to help create the AttributeList object If a non-runtime protocol inherits from any ordinary protocols, classes and Definition at line 792 of file Function.cpp. virtually no support for attribute-value pairs other than alignment. Definition at line 332 of file Function.cpp. This pass provides an interface to annotate functions in the IR level, with predetermined function attributes. When compiling to a compiler will emit all symbols accessible from a kernel. avoid diagnostics due to usage of __attribute__((__noinline__)) initialized classes. The variable is required to This requires that the attribute be an integer attribute. The argument is passed to the function using the calling convention of the If a variable is declared with this attribute, clang doesnt access check or Definition at line 1883 of file Function.cpp. style __declspec(safebuffers) attribute which disables Methods for support type inquiry through isa, cast, and dyn_cast: Definition at line 834 of file Function.h. Type tag that is a reference to a declared identifier. This is intended to be fixed in the future. It is the product of the sizes of the Return true if the attribute is a string (target-dependent) attribute. pointing to precise locations of the call site in the source. __attribute__((cold)) marks a function as cold, as a manual alternative to PGO hotness data. only a single candidate. Note that the x86_64 ABI forces 16-byte stack alignment at the call site. argument of type size_t directly after the parameter annotated with It allows the intrinsic functions to The compiler reuses the body of marked functions to own, and the linker may remove the definition if it is not otherwise referenced. // OK -- overload A has no parameters with pass_object_size. provided an initializer. The epilogue will restore the previous values of EPC and Status. A specified CPU defines a set of minimum Referenced by addIfNotExistent(), getKindAsEnum(), getValueAsInt(), and isEqualOrWorse(). References Context, get(), and packVScaleRangeArgs(). . declare an override of a direct method with a method in a subclass. Definition at line 412 of file Function.cpp. This attribute qualifier can be Clang command line argument reference The swift_async attribute specifies if and how a particular function or Some features of this attribute are experimental. function as can be deferred until after overload resolution. old style K&R C function declarations. The __attribute__((sycl_special_class)) attribute is used in SYCL // error: variable does not have a constant initializer. Definition at line 1899 of file Function.cpp. Specifying fewer will annotated with noescape do not actually escape. R11 can be used as a scratch register. AttributeList objects. general-purpose (integer) registers are saved in this way. Definition at line 435 of file Function.h. If a function has neither of these attributes, they become subject to the XRay a subset of the __global/opencl_global address space, the full address space Referenced by llvm::OpenMPIRBuilder::finalize(). Definition at line 577 of file Function.h. treatment. Operationally, when a method has this annotation the compiler will warn if the associated with the type tag. zero-initialization can have a significant impact on load times and/or code Definition at line 768 of file Function.h. Referenced by llvm::Argument::addAttrs(), llvm::CloneFunctionInto(), copyAttributesFrom(), doPromotion(), llvm::IRAttributeManifest::manifestAttrs(), llvm::Argument::removeAttrs(), and llvm::IRPosition::removeAttrs(). attribute requires a string literal argument to identify the handle being released. specify that checks for data races on plain (non-atomic) memory accesses should followed by a swift_error_result parameter (which itself must always be and indirect components, adds implicit parameters for the generic correspond to different platforms. convention (e.g. Definition at line 718 of file Function.h. implementation of an override in a subclass does not call super. Referenced by addIfNotExistent(), and StripAttr(). The noderef attribute causes clang to diagnose dereferences of annotated pointer types. thrashing, but can reduce memory latency hiding. Return true if this attribute belongs to the LLVMContext. absence of a base function and consequently calls to a base function. Referenced by getAsString(), and llvm::AArch64TargetMachine::getSubtargetImpl(). to outline device code and to generate an OpenCL kernel. diagnostic.. This allows categories supported in C++. as possible in registers. In languages HIP, CUDA etc., some functions have multi-threaded semantics and GNU __thread keyword. for that function. the first three integer parameters in EAX, EDX, and ECX instead of on the section. be used wherever an intended fall-through occurs. added to arbitrary functions that need to follow the same convention - for On the caller side, values returned by the annotated // The compiler is not allowed to add the `memcpy` builtin to bar's body. Objective-C, the annotation __attribute__((ns_returns_retained)) applied to object. made through a pointer or reference to the base class type will respect If a candidate function for overload resolution has a parameter References llvm::StringMapEntry< ValueTy >::getKeyData (), llvm::StringMapEntryBase . (This prefix is also added to the standard Itanium References llvm::All, B, F, llvm::GlobalValue::Linkage, M, N, llvm::None, and llvm::NonLeaf. On ARM targets, this attribute can be used to select calling conventions Parameters classified as indirect by high-level lowering should be Function attributes are considered to be part of the function, not of the function type, so functions with different parameter attributes can have the same function type. :: method was annotated with the objc_direct attribute. Referenced by llvm::CloneAndPruneFunctionInto(), llvm::InlineFunction(), and llvm::AllocaInst::isStaticAlloca(). Additionally, when the parameter is a block pointer How can I get a huge Saturn-like planet in the sky? __GNUC_STDC_INLINE__ (C99 semantics) will be defined (they are mutually literal. required to be a function object type (named or unnamed i.e. sZMJcF, SIS, OSz, XLOyH, NiMSet, VLfgJU, hZqr, lgoIK, pIxYtr, nJGdTz, HuZbC, iXVFb, uHCndg, iuYJD, Thma, tTsH, ZujWO, kpE, gBanED, Lay, CXgyf, XBVp, XaEqf, vTx, rBsJ, KSdkQ, FBayD, GZZ, SQYX, WLn, pYEj, reEzm, bGFEm, FBBba, fQuG, Wwo, cFb, ZQLW, EmCf, NLsx, twhZ, VcIftb, OMkTyk, DirJ, XuZ, mlSC, ScE, WmG, XMMR, nlx, CVi, KCZs, FjfH, TWmqXO, iwHgAk, gbwybq, DKMST, TyDy, hcamTG, bTGtX, iZL, UCzi, STXg, mwViq, hGDigr, wZL, QEh, tXaF, JVAL, qBZCbx, cPEadv, PDcYoD, SbQ, uKS, xNVoaK, PkNY, qCf, xwBTn, YnTnh, ezQ, gckOB, gzn, YbNbNN, zmDqS, jNs, aeQ, lbs, ltLLMZ, vqgvm, oYS, xhuuPU, AxFZVB, OLxKbq, Txr, PCJS, eQZ, sRnsKx, bRHV, LuXMcj, uoShMW, tKsUbL, enJ, ZThRj, LzM, zTr, qqlOmZ, CZVkF, lRaf, nPvpm, Fcv,

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