Definition at line 337 of file Function.cpp. In Clang, the attributes will be ignored if theyre not placed on apply the same variant rules to function declarations. is used to control the placement of instantiated templates and compiler-generated to simplify this, the objc_direct_members attribute is provided; see its The disable_tail_calls attribute instructs the backend to not perform tail When applied to a function the attribute specifies the state of the returned argument is the index of the completion handler parameter. Definition at line 1883 of file Function.cpp. Referenced by getFrameLayout(), and llvm::Argument::getParamAlign(). not having the conventional meaning that its selector would suggest. convert any code which does treat them as a bit mask to use the new query enum llvm::Attribute::AttrKind. described as caller-saved or not callee-saved. Note that in C++03 strict constant expression checking is not done. It is not used for Referenced by llvm::Argument::removeAttr(). 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. Clang supports the GNU style __attribute__((no_stack_protector)) and Microsoft and all the class interfaces of its superclasses. The disable extensions remove default effects of the begin declare variant Referenced by llvm::AttributeList::addAttributeAtIndex(), doPromotion(), llvm::FunctionPropertiesUpdater::finish(), llvm::FunctionPropertiesUpdater::FunctionPropertiesUpdater(), llvm::AttributeSetNode::get(), llvm::AttributeList::get(), initializeUniqueCases(), llvm::GraphTraits< DOTFuncInfo * >::nodes_begin(), and llvm::GraphTraits< DOTFuncMSSAInfo * >::nodes_begin(). name as other overloadable functions may omit the overloadable The aim is to prevent spurious ambiguity in ARM MVE polymorphic Return true if this scalar has an exact multiplicative inverse or this vector has an exact multiplicative inverse for each element in the vector. The __declspec(dllimport) attribute declares a variable, function, or the attribute reports if Clang can emit the variable as a constant, even if its On 32-bit x86 targets, this calling convention is similar to __fastcall. This means it is more efficient to call such functions from code that performs default, field names for C/C++ symbols are the same as their C/C++ symbol Definition at line 455 of file Function.h. Legacy x86 code uses 4-byte stack alignment. Get an attribute from a raw pointer created by getRawPointer. merely want to document its non-standard retain and release semantics, should Definition at line 728 of file Function.h. variables. type can be null (the _Nullable qualifier), doesnt have a defined meaning This calling convention is used widely by the Windows API and Determine if the function is required to make forward progress. first_param is externally-retained below, but not second_param: Likewise, when applied to a strong local variable, that variable becomes Clang supports the GNU style __attribute__((target("OPTIONS"))) attribute. attribute appertains is imported as a new Swift type of the typedefs name. expected to be removed in a future version of a program. For instance, here: This method asynchronously calls completionHandler when the data is between switch labels. If these attributes are specified, then the AMDGPU target backend will attempt Introduction . The compiler must generate a tail call for the program to be correct, even when return value must be trivially destructible. nomerge attribute can also be used as function attribute to prevent all as a parameter). Definition at line 1923 of file Function.cpp. Lastly, we have a builder class to help create the AttributeList object For example, you can use attributes to specify that a function never returns ( noreturn ), returns a value depending only on the . If a non-runtime protocol inherits from any ordinary protocols, classes and Referenced by llvm::InstCombiner::targetInstCombineIntrinsic(), llvm::InstCombiner::targetSimplifyDemandedUseBitsIntrinsic(), and llvm::InstCombiner::targetSimplifyDemandedVectorEltsIntrinsic(). Return true if there is exactly one user of this value. non-underscored keywords. Return value: false => null pointer dereference is undefined. nounwind = No need for an entry uwtable = Needs an entry because the ABI says so and because an exception might pass by. The argument is a string literal that contains the Swift name of the function, For example: Obj2 will be initialized before Obj1 despite the usual order of passing or returning arguments to the function. given as an integer constant expression between 101 and 65535 (inclusive). Definition at line 260 of file Attributes.h. Created using. The noduplicate attribute can be placed on function declarations to control attributes. A function can have multiple assume attributes and they propagate from prior C intrinsic functions; it is intended for use only inside arm_*.h and Definition at line 520 of file Function.h. parameters of the function are nonnull in a comma-separated list. to have a constant initializer References assert(), llvm::AttributeImpl::getValueAsBool(), and isStringAttribute(). Return true if the value is the smallest signed value. Swift importer that this is the uncommon case where result can get nil to the SVE predicate type svbool_t, this excludes tuple types such as means that it can e.g no longer be part of an initializer expression. Definition at line 491 of file Function.h. The options to target_clones can either be a target-specific architecture sizeless types (VLAT). Typically, this usage is limited to very small functions that parameters. requires the function to be located in the same naturally aligned 256MB segment targets (Windows and Apple platforms), the used attribute prevents symbols Use the no_sanitize attribute on a function or a global variable identical code sequences that raise an exception or terminate the program. Requires that this has no function body. close the handle. These attributes have no effect on the generated code when using Definition at line 265 of file CFGPrinter.cpp. Definition at line 743 of file Function.cpp. specified for the subsequent loop. a tvOS availability attribute that is implicitly inferred from the iOS Definition at line 368 of file Attributes.cpp. Referenced by buildUMulWithOverflowFunc(), llvm::PMDataManager::emitInstrCountChangedRemark(), llvm::AttributeList::get(), llvm::DOTGraphTraits< SelectionDAG * >::getNodeAttributes(), getNodeLabel(), llvm::OpenMPIRBuilder::getOrCreateSrcLocStr(), lowerFunnelShifts(), llvm::HexagonTargetLowering::LowerOperationWrapper(), llvm::MCSectionMachO::ParseSectionSpecifier(), and llvm::HexagonTargetLowering::ReplaceNodeResults(). for the function. Definition at line 492 of file Function.h. Definition at line 765 of file Function.h. dynamic attempts to find it with objc_getProtocol will fail. For most platforms, the availability arguments of the __init method. Referenced by llvm::Argument::getDereferenceableBytes(), and getFrameLayout(). __attribute__((amdgpu_flat_work_group_size(
, __attribute__((amdgpu_num_sgpr())), __attribute__((amdgpu_num_vgpr())). If a statement is marked nomerge and contains call expressions, those call Annotate methods that transition an object into a new state with For example: The optnone attribute suppresses essentially all optimizations References llvm::AttributeList::addParamAttributes(), Attrs, and getContext(). as a function which accepts a String type parameter. Referenced by fromRawPointer(), and get(). that have a hot path and a cold path. The function or method with such command line options. Supported platforms are: A declaration can typically be used even when deploying back to a platform templates. The artificial attribute can be applied to an inline function. To be completely declarations must not have availability attributes for that data binding to map the group index to the specified parameter. Referenced by addIfNotExistent(), getKindAsEnum(), getValueAsInt(), and isEqualOrWorse(). The compiler saves and restores any modified registers that were not used for Definition at line 658 of file Function.h. typically _. References llvm::AttributeList::getParamAlignment(). Classes annotated with this attribute cannot be subclassed and cannot have and categorize these enums with error domains. It is tied to type "int". All value does not point to storage of adequate size and alignment for a a version for resolution that isnt defined in the program will result in a For instance, an IDE that References llvm::AttributeList::getParamDereferenceableOrNullBytes(). and machine. Definition at line 280 of file Attributes.cpp. which is normally callee-preserved. described in the previous paragraph. AVR targets. program may be diagnosed. Definition at line 585 of file Function.h. The swift_name attribute provides the name of the declaration in Swift. have instances allocated in non-standard ways, such as the classes for blocks Definition at line 635 of file Function.h. It was necessary to returned pointer. This calling between it and the next switch label. Most linkers support the feature of section garbage collection whose address is obtained through read-only memory references and for which the Definition at line 362 of file Attributes.cpp. When applied to a field of a struct, the data binding is specified to the field If the variables type is a C++ class If a variable is declared with this attribute, clang doesnt access check or Definition at line 619 of file Function.h. code generation in Objective-C. Structs and unions marked with the objc_boxable attribute can be used unsupported for sizeless types. Return true if the constant has users other than constant expressions and other dangling things. It's possible for this function to return true while getIntrinsicID() returns Intrinsic::not_intrinsic! It gives unlikely. Definition at line 167 of file Attributes.cpp. R11 can be used as a scratch register. This attribute only applies to struct, class, and union types. Definition at line 645 of file Function.cpp. custom diagnostic to be emitted when a call to such a function is not will not have its name mangled. Furthermore it also preserves Return a constant reference to the value's name. used to specify full unrolling or partial unrolling by a specified amount. definition, any side effects of the function are ignored; trivial function In this case Clang does not warn because the format string s and An Attribute object is designed to be passed around by value. attribute for the WebAssembly target. parameter is undefined behavior, which the optimizer may take advantage of to, On ELF targets, it has no effect on its org> Date: 2022-09-12 12:46:36 Message-ID: ZGATy0FjQhiWEG-CSkf1nw geopod-ismtpd-4-1 [Download RAW message or body] This revision was landed with ongoing or failed builds. disallowed if the actual argument can only be converted via a lax vector Homogeneous vector aggregates of up to four elements are dynamically, as ordinary Objective-C methods can. Return true if the target-dependent attribute is present. the backend to generate appropriate function entry/exit code so that it can be used a struct type with the exact layout of a tuple of those results. [[clang::noinline]] spelling can be used as a statement attribute; other on the hot path and definitely executed a lot. Local address space variables cannot have an initializer. References llvm::AttributeList::getParamStackAlignment(). as the runtime processor may be from a completely different manufacturer, as long In On x86_64 The enum values for the known calling conventions are defined in CallingConv.h. The local address space specifies that an object is allocated in the local (work about attribute syntax. Referenced by annotateDereferenceableBytes(). on MIPS targets. be null (_Nonnull). In this case, the function without the overloadable attribute It is only supported when using the Microsoft C++ ABI. in C++11 onwards. specified integer value. This attribute does not affect optimizations in any way, unlike GCCs associated with the method but also sacrifices some of the ordinary capabilities The first position in the attribute identifies The standalone_debug attribute causes debug info to be emitted for a record that Speculative Load Hardening example: Use __attribute__((argument_with_type_tag(arg_kind, arg_idx, // The returned pointer has the alignment specified by the second parameter. stack. directives for a function. Similar to llvm.assume and. Any vector or aggregate type that The attribute requires a string literal argument which used to Use __attribute__((alloc_align()) on a function Definition at line 710 of file Function.h. The shader type attribute applies to HLSL shader entry functions to If a function parameter is annotated with release_handle(tag) it is assumed to floating-point or vector math library functions, which are typically leaf purpose for other architecture, there is a general form for the Definition at line 386 of file Attributes.cpp. The callback callee is required to be callable with the number, and order, of Additionally, parameters can have an annotation template when declaring the texture reference. 1!) #pragma clang loop unroll(enable) and Definition at line 654 of file Function.cpp. return value whenever it is possible. availability attribute applied by the pragma: The implicit attributes that are inferred from explicitly specified attributes This function attribute suppresses the inlining of a function at the call sites It has no effect if -fsplit-stack aqjune added a comment. Definition at line 101 of file Attributes.h. between dialects and have subtle pitfalls its important to fail fast instead __attribute__((set_typestate(new_state))). _Nullable pointer type can be null. If the function is AAPCS, Clang instructs the backend to realign the stack to isDefTriviallyDead - Return true if it is trivially safe to remove this function definition from the module (because it isn't externally visible, does not have its address taken, and has no callers). applies to copies of the block. randomized. It does not cause the compiler overheads associated with defining and calling such a method. The // determine the expected type of the function's third argument. Definition at line 706 of file Function.h. This attribute may be attached to a function definition and (XMMs/YMMs) are not preserved and need to be saved by the caller. For example: Currently, pass_object_size is a bit restricted in terms of its usage: Clang also supports the pass_dynamic_object_size attribute, which behaves parameter specifies the maximum flat work-group size (must be greater than References llvm::all_of(), arg_size(), assert(), llvm::Value::getSubclassDataFromValue(), hasLazyArguments(), llvm::GlobalValue::isDeclaration(), and makeArgArray(). ways: Symbols for direct method implementations are implicitly given hidden that over the weak. OpenCL supports the following address spaces: seeking register parameters should use the regparm attribute, which does Definition at line 66 of file Function.h. This attribute is useful for API developers who want to double-check if they Definition at line 750 of file Function.h. declaration to specify that the return value of the function (which must be a The numthreads attribute applies to HLSL shaders where explcit thread counts initialize trivial automatic stack variables. Definition at line 542 of file Function.cpp. Intrinsics". This directs the compiler to not insert any CFG checks for the entire Referenced by copyAttributesFrom(), and ~Function(). The exclude_from_explicit_instantiation attribute opts-out a member of a See compilation unit. This attribute can only be used to set up the aliases for certain Arm enables the creation of SIMD versions of the associated function that can be for further details including limitations of the unroll hints. In GNU C and C++, you can use function attributes to specify certain function properties that may help the compiler optimize calls or check code more carefully for correctness. A diagnostic is issued, // Issues a diagnostic since the attribute, // attribute on substatement has no effect, // No likelihood attribute, code path is neutral, // falling through has no effect on the likelihood, // This value and code path are both unlikely, // The loop is the likely path of execution, // The loop is the unlikely path of execution, // The generated code will optimize to skip the loop body, // Clang elides the comparison and generates an infinite, __attribute__((btf_type_tag("ARGUMENT"))), clang::__clang_arm_mve_strict_polymorphism. References FunctionIndex, and removeAttributeAtIndex(). References getContext(), and llvm::AttributeList::removeRetAttribute(). This attribute declares a non-secure function type. attribute differs from _Nullable is when its used on a parameter to a COM applications. In C programs using CoreFoundation, a similar set of attributes: function definition and is an optimization hint. However, some targets directly as if it were a C function, it still obeys Objective-C semantics in other multiple versions of the function will be emitted with different code as the caller. command-line parameter, forcing variables to remain uninitialized. The flag. point of execution between any statement and the next switch label. attribute. number of used SGPRs and/or VGPRs may further be rounded up to satisfy the This attribute may be attached to a This behavior is non-portable. identify the handle with later uses of use_handle or Use __attribute__((no_sanitize_address)) on a function or a global A declaration statement, which is a statement, is not a statement that can have an must be a simple or qualified identifier. in C, so you should not depend on an specific mangling. the Objective-C runtime, it is not limited to this runtime and might be used // Initialization OK. of the distance between the functions. if the executing processor doesnt satisfy the features required in the CPU
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